diff options
| author | Greg Kroah-Hartman <gregkh@suse.de> | 2010-04-28 12:43:39 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-04-28 12:43:39 -0700 |
| commit | 7ba0ca4b21d6d8a0603672e0d5e18459b49229c7 (patch) | |
| tree | 4d00504d3967e79ee48f819763bf2f10d697e879 /tty | |
| parent | 7c3322f69ee54e7daef12ac46f850fa34e3396c7 (diff) | |
| download | patches-7ba0ca4b21d6d8a0603672e0d5e18459b49229c7.tar.gz | |
more patches
Diffstat (limited to 'tty')
| -rw-r--r-- | tty/serial-add-driver-for-the-altera-jtag-uart.patch | 596 | ||||
| -rw-r--r-- | tty/serial-add-driver-for-the-altera-uart.patch | 668 | ||||
| -rw-r--r-- | tty/tty-n_gsm-line-discipline.patch | 2869 |
3 files changed, 2869 insertions, 1264 deletions
diff --git a/tty/serial-add-driver-for-the-altera-jtag-uart.patch b/tty/serial-add-driver-for-the-altera-jtag-uart.patch deleted file mode 100644 index 0dc62ce570a769..00000000000000 --- a/tty/serial-add-driver-for-the-altera-jtag-uart.patch +++ /dev/null @@ -1,596 +0,0 @@ -From tklauser@distanz.ch Thu Apr 22 16:23:18 2010 -From: Tobias Klauser <tklauser@distanz.ch> -Date: Tue, 30 Mar 2010 16:54:41 +0200 -Subject: serial: Add driver for the Altera JTAG UART -To: linux-serial@vger.kernel.org, Andrew Morton <akpm@linux-foundation.org> -Cc: Tobias Klauser <tklauser@distanz.ch>, gregkh@suse.de, nios2-dev@sopc.et.ntust.edu.tw, linux-kernel@vger.kernel.org -Message-ID: <7ee8095973eb373d34a31ca3875fa7b726bdf552.1269960350.git.tklauser@distanz.ch> - - -Add an UART driver for the JTAG UART component available as a SOPC -(System on Programmable Chip) component for Altera FPGAs. - -Signed-off-by: Tobias Klauser <tklauser@distanz.ch> -Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> - ---- - drivers/serial/Kconfig | 21 + - drivers/serial/Makefile | 1 - drivers/serial/altera_jtaguart.c | 504 +++++++++++++++++++++++++++++++++++++++ - include/linux/altera_jtaguart.h | 16 + - include/linux/serial_core.h | 3 - 5 files changed, 545 insertions(+) - ---- a/drivers/serial/Kconfig -+++ b/drivers/serial/Kconfig -@@ -1506,4 +1506,25 @@ config SERIAL_GRLIB_GAISLER_APBUART_CONS - help - Support for running a console on the GRLIB APBUART - -+config SERIAL_ALTERA_JTAGUART -+ tristate "Altera JTAG UART support" -+ select SERIAL_CORE -+ help -+ This driver supports the Altera JTAG UART port. -+ -+config SERIAL_ALTERA_JTAGUART_CONSOLE -+ bool "Altera JTAG UART console support" -+ depends on SERIAL_ALTERA_JTAGUART -+ select SERIAL_CORE_CONSOLE -+ help -+ Enable a Altera JTAG UART port to be the system console. -+ -+config SERIAL_ALTERA_JTAGUART_CONSOLE_BYPASS -+ bool "Bypass output when no connection" -+ depends on SERIAL_ALTERA_JTAGUART_CONSOLE -+ select SERIAL_CORE_CONSOLE -+ help -+ Bypass console output and keep going even if there is no -+ JTAG terminal connection with the host. -+ - endmenu ---- a/drivers/serial/Makefile -+++ b/drivers/serial/Makefile -@@ -83,3 +83,4 @@ obj-$(CONFIG_KGDB_SERIAL_CONSOLE) += kgd - obj-$(CONFIG_SERIAL_QE) += ucc_uart.o - obj-$(CONFIG_SERIAL_TIMBERDALE) += timbuart.o - obj-$(CONFIG_SERIAL_GRLIB_GAISLER_APBUART) += apbuart.o -+obj-$(CONFIG_SERIAL_ALTERA_JTAGUART) += altera_jtaguart.o ---- /dev/null -+++ b/drivers/serial/altera_jtaguart.c -@@ -0,0 +1,504 @@ -+/* -+ * altera_jtaguart.c -- Altera JTAG UART driver -+ * -+ * Based on mcf.c -- Freescale ColdFire UART driver -+ * -+ * (C) Copyright 2003-2007, Greg Ungerer <gerg@snapgear.com> -+ * (C) Copyright 2008, Thomas Chou <thomas@wytron.com.tw> -+ * (C) Copyright 2010, Tobias Klauser <tklauser@distanz.ch> -+ * -+ * This program is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ */ -+ -+#include <linux/kernel.h> -+#include <linux/init.h> -+#include <linux/interrupt.h> -+#include <linux/module.h> -+#include <linux/console.h> -+#include <linux/tty.h> -+#include <linux/tty_flip.h> -+#include <linux/serial.h> -+#include <linux/serial_core.h> -+#include <linux/platform_device.h> -+#include <linux/io.h> -+#include <linux/altera_jtaguart.h> -+ -+#define DRV_NAME "altera_jtaguart" -+ -+/* -+ * Altera JTAG UART register definitions according to the Altera JTAG UART -+ * datasheet: http://www.altera.com/literature/hb/nios2/n2cpu_nii51009.pdf -+ */ -+ -+#define ALTERA_JTAGUART_SIZE 8 -+ -+#define ALTERA_JTAGUART_DATA_REG 0 -+ -+#define ALTERA_JTAGUART_DATA_DATA_MSK 0x000000FF -+#define ALTERA_JTAGUART_DATA_RVALID_MSK 0x00008000 -+#define ALTERA_JTAGUART_DATA_RAVAIL_MSK 0xFFFF0000 -+#define ALTERA_JTAGUART_DATA_RAVAIL_OFF 16 -+ -+#define ALTERA_JTAGUART_CONTROL_REG 4 -+ -+#define ALTERA_JTAGUART_CONTROL_RE_MSK 0x00000001 -+#define ALTERA_JTAGUART_CONTROL_WE_MSK 0x00000002 -+#define ALTERA_JTAGUART_CONTROL_RI_MSK 0x00000100 -+#define ALTERA_JTAGUART_CONTROL_RI_OFF 8 -+#define ALTERA_JTAGUART_CONTROL_WI_MSK 0x00000200 -+#define ALTERA_JTAGUART_CONTROL_AC_MSK 0x00000400 -+#define ALTERA_JTAGUART_CONTROL_WSPACE_MSK 0xFFFF0000 -+#define ALTERA_JTAGUART_CONTROL_WSPACE_OFF 16 -+ -+/* -+ * Local per-uart structure. -+ */ -+struct altera_jtaguart { -+ struct uart_port port; -+ unsigned int sigs; /* Local copy of line sigs */ -+ unsigned long imr; /* Local IMR mirror */ -+}; -+ -+static unsigned int altera_jtaguart_tx_empty(struct uart_port *port) -+{ -+ return (readl(port->membase + ALTERA_JTAGUART_CONTROL_REG) & -+ ALTERA_JTAGUART_CONTROL_WSPACE_MSK) ? TIOCSER_TEMT : 0; -+} -+ -+static unsigned int altera_jtaguart_get_mctrl(struct uart_port *port) -+{ -+ return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS; -+} -+ -+static void altera_jtaguart_set_mctrl(struct uart_port *port, unsigned int sigs) -+{ -+} -+ -+static void altera_jtaguart_start_tx(struct uart_port *port) -+{ -+ struct altera_jtaguart *pp = -+ container_of(port, struct altera_jtaguart, port); -+ -+ pp->imr |= ALTERA_JTAGUART_CONTROL_WE_MSK; -+ writel(pp->imr, port->membase + ALTERA_JTAGUART_CONTROL_REG); -+} -+ -+static void altera_jtaguart_stop_tx(struct uart_port *port) -+{ -+ struct altera_jtaguart *pp = -+ container_of(port, struct altera_jtaguart, port); -+ -+ pp->imr &= ~ALTERA_JTAGUART_CONTROL_WE_MSK; -+ writel(pp->imr, port->membase + ALTERA_JTAGUART_CONTROL_REG); -+} -+ -+static void altera_jtaguart_stop_rx(struct uart_port *port) -+{ -+ struct altera_jtaguart *pp = -+ container_of(port, struct altera_jtaguart, port); -+ -+ pp->imr &= ~ALTERA_JTAGUART_CONTROL_RE_MSK; -+ writel(pp->imr, port->membase + ALTERA_JTAGUART_CONTROL_REG); -+} -+ -+static void altera_jtaguart_break_ctl(struct uart_port *port, int break_state) -+{ -+} -+ -+static void altera_jtaguart_enable_ms(struct uart_port *port) -+{ -+} -+ -+static void altera_jtaguart_set_termios(struct uart_port *port, -+ struct ktermios *termios, -+ struct ktermios *old) -+{ -+ /* Just copy the old termios settings back */ -+ if (old) -+ tty_termios_copy_hw(termios, old); -+} -+ -+static void altera_jtaguart_rx_chars(struct altera_jtaguart *pp) -+{ -+ struct uart_port *port = &pp->port; -+ unsigned char ch, flag; -+ unsigned long status; -+ -+ while ((status = readl(port->membase + ALTERA_JTAGUART_DATA_REG)) & -+ ALTERA_JTAGUART_DATA_RVALID_MSK) { -+ ch = status & ALTERA_JTAGUART_DATA_DATA_MSK; -+ flag = TTY_NORMAL; -+ port->icount.rx++; -+ -+ if (uart_handle_sysrq_char(port, ch)) -+ continue; -+ uart_insert_char(port, 0, 0, ch, flag); -+ } -+ -+ tty_flip_buffer_push(port->state->port.tty); -+} -+ -+static void altera_jtaguart_tx_chars(struct altera_jtaguart *pp) -+{ -+ struct uart_port *port = &pp->port; -+ struct circ_buf *xmit = &port->state->xmit; -+ unsigned int pending, count; -+ -+ if (port->x_char) { -+ /* Send special char - probably flow control */ -+ writel(port->x_char, port->membase + ALTERA_JTAGUART_DATA_REG); -+ port->x_char = 0; -+ port->icount.tx++; -+ return; -+ } -+ -+ pending = uart_circ_chars_pending(xmit); -+ if (pending > 0) { -+ count = (readl(port->membase + ALTERA_JTAGUART_CONTROL_REG) & -+ ALTERA_JTAGUART_CONTROL_WSPACE_MSK) >> -+ ALTERA_JTAGUART_CONTROL_WSPACE_OFF; -+ if (count > pending) -+ count = pending; -+ if (count > 0) { -+ pending -= count; -+ while (count--) { -+ writel(xmit->buf[xmit->tail], -+ port->membase + ALTERA_JTAGUART_DATA_REG); -+ xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); -+ port->icount.tx++; -+ } -+ if (pending < WAKEUP_CHARS) -+ uart_write_wakeup(port); -+ } -+ } -+ -+ if (pending == 0) { -+ pp->imr &= ~ALTERA_JTAGUART_CONTROL_WE_MSK; -+ writel(pp->imr, port->membase + ALTERA_JTAGUART_CONTROL_REG); -+ } -+} -+ -+static irqreturn_t altera_jtaguart_interrupt(int irq, void *data) -+{ -+ struct uart_port *port = data; -+ struct altera_jtaguart *pp = -+ container_of(port, struct altera_jtaguart, port); -+ unsigned int isr; -+ -+ isr = (readl(port->membase + ALTERA_JTAGUART_CONTROL_REG) >> -+ ALTERA_JTAGUART_CONTROL_RI_OFF) & pp->imr; -+ -+ spin_lock(&port->lock); -+ -+ if (isr & ALTERA_JTAGUART_CONTROL_RE_MSK) -+ altera_jtaguart_rx_chars(pp); -+ if (isr & ALTERA_JTAGUART_CONTROL_WE_MSK) -+ altera_jtaguart_tx_chars(pp); -+ -+ spin_unlock(&port->lock); -+ -+ return IRQ_RETVAL(isr); -+} -+ -+static void altera_jtaguart_config_port(struct uart_port *port, int flags) -+{ -+ port->type = PORT_ALTERA_JTAGUART; -+ -+ /* Clear mask, so no surprise interrupts. */ -+ writel(0, port->membase + ALTERA_JTAGUART_CONTROL_REG); -+} -+ -+static int altera_jtaguart_startup(struct uart_port *port) -+{ -+ struct altera_jtaguart *pp = -+ container_of(port, struct altera_jtaguart, port); -+ unsigned long flags; -+ int ret; -+ -+ ret = request_irq(port->irq, altera_jtaguart_interrupt, IRQF_DISABLED, -+ DRV_NAME, port); -+ if (ret) { -+ pr_err(DRV_NAME ": unable to attach Altera JTAG UART %d " -+ "interrupt vector=%d\n", port->line, port->irq); -+ return ret; -+ } -+ -+ spin_lock_irqsave(&port->lock, flags); -+ -+ /* Enable RX interrupts now */ -+ pp->imr = ALTERA_JTAGUART_CONTROL_RE_MSK; -+ writel(pp->imr, port->membase + ALTERA_JTAGUART_CONTROL_REG); -+ -+ spin_unlock_irqrestore(&port->lock, flags); -+ -+ return 0; -+} -+ -+static void altera_jtaguart_shutdown(struct uart_port *port) -+{ -+ struct altera_jtaguart *pp = -+ container_of(port, struct altera_jtaguart, port); -+ unsigned long flags; -+ -+ spin_lock_irqsave(&port->lock, flags); -+ -+ /* Disable all interrupts now */ -+ pp->imr = 0; -+ writel(pp->imr, port->membase + ALTERA_JTAGUART_CONTROL_REG); -+ -+ spin_unlock_irqrestore(&port->lock, flags); -+ -+ free_irq(port->irq, port); -+} -+ -+static const char *altera_jtaguart_type(struct uart_port *port) -+{ -+ return (port->type == PORT_ALTERA_JTAGUART) ? "Altera JTAG UART" : NULL; -+} -+ -+static int altera_jtaguart_request_port(struct uart_port *port) -+{ -+ /* UARTs always present */ -+ return 0; -+} -+ -+static void altera_jtaguart_release_port(struct uart_port *port) -+{ -+ /* Nothing to release... */ -+} -+ -+static int altera_jtaguart_verify_port(struct uart_port *port, -+ struct serial_struct *ser) -+{ -+ if (ser->type != PORT_UNKNOWN && ser->type != PORT_ALTERA_JTAGUART) -+ return -EINVAL; -+ return 0; -+} -+ -+/* -+ * Define the basic serial functions we support. -+ */ -+static struct uart_ops altera_jtaguart_ops = { -+ .tx_empty = altera_jtaguart_tx_empty, -+ .get_mctrl = altera_jtaguart_get_mctrl, -+ .set_mctrl = altera_jtaguart_set_mctrl, -+ .start_tx = altera_jtaguart_start_tx, -+ .stop_tx = altera_jtaguart_stop_tx, -+ .stop_rx = altera_jtaguart_stop_rx, -+ .enable_ms = altera_jtaguart_enable_ms, -+ .break_ctl = altera_jtaguart_break_ctl, -+ .startup = altera_jtaguart_startup, -+ .shutdown = altera_jtaguart_shutdown, -+ .set_termios = altera_jtaguart_set_termios, -+ .type = altera_jtaguart_type, -+ .request_port = altera_jtaguart_request_port, -+ .release_port = altera_jtaguart_release_port, -+ .config_port = altera_jtaguart_config_port, -+ .verify_port = altera_jtaguart_verify_port, -+}; -+ -+#define ALTERA_JTAGUART_MAXPORTS 1 -+static struct altera_jtaguart altera_jtaguart_ports[ALTERA_JTAGUART_MAXPORTS]; -+ -+#if defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE) -+ -+int __init early_altera_jtaguart_setup(struct altera_jtaguart_platform_uart -+ *platp) -+{ -+ struct uart_port *port; -+ int i; -+ -+ for (i = 0; i < ALTERA_JTAGUART_MAXPORTS && platp[i].mapbase; i++) { -+ port = &altera_jtaguart_ports[i].port; -+ -+ port->line = i; -+ port->type = PORT_ALTERA_JTAGUART; -+ port->mapbase = platp[i].mapbase; -+ port->membase = ioremap(port->mapbase, ALTERA_JTAGUART_SIZE); -+ port->iotype = SERIAL_IO_MEM; -+ port->irq = platp[i].irq; -+ port->flags = ASYNC_BOOT_AUTOCONF; -+ port->ops = &altera_jtaguart_ops; -+ } -+ -+ return 0; -+} -+ -+#if defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE_BYPASS) -+static void altera_jtaguart_console_putc(struct console *co, const char c) -+{ -+ struct uart_port *port = &(altera_jtaguart_ports + co->index)->port; -+ unsigned long status; -+ unsigned long flags; -+ -+ spin_lock_irqsave(&port->lock, flags); -+ while (((status = readl(port->membase + ALTERA_JTAGUART_CONTROL_REG)) & -+ ALTERA_JTAGUART_CONTROL_WSPACE_MSK) == 0) { -+ if ((status & ALTERA_JTAGUART_CONTROL_AC_MSK) == 0) { -+ spin_unlock_irqrestore(&port->lock, flags); -+ return; /* no connection activity */ -+ } -+ spin_unlock_irqrestore(&port->lock, flags); -+ cpu_relax(); -+ spin_lock_irqsave(&port->lock, flags); -+ } -+ writel(c, port->membase + ALTERA_JTAGUART_DATA_REG); -+ spin_unlock_irqrestore(&port->lock, flags); -+} -+#else -+static void altera_jtaguart_console_putc(struct console *co, const char c) -+{ -+ struct uart_port *port = &(altera_jtaguart_ports + co->index)->port; -+ unsigned long flags; -+ -+ spin_lock_irqsave(&port->lock, flags); -+ while ((readl(port->membase + ALTERA_JTAGUART_CONTROL_REG) & -+ ALTERA_JTAGUART_CONTROL_WSPACE_MSK) == 0) { -+ spin_unlock_irqrestore(&port->lock, flags); -+ cpu_relax(); -+ spin_lock_irqsave(&port->lock, flags); -+ } -+ writel(c, port->membase + ALTERA_JTAGUART_DATA_REG); -+ spin_unlock_irqrestore(&port->lock, flags); -+} -+#endif -+ -+static void altera_jtaguart_console_write(struct console *co, const char *s, -+ unsigned int count) -+{ -+ for (; count; count--, s++) { -+ altera_jtaguart_console_putc(co, *s); -+ if (*s == '\n') -+ altera_jtaguart_console_putc(co, '\r'); -+ } -+} -+ -+static int __init altera_jtaguart_console_setup(struct console *co, -+ char *options) -+{ -+ struct uart_port *port; -+ -+ if (co->index < 0 || co->index >= ALTERA_JTAGUART_MAXPORTS) -+ return -EINVAL; -+ port = &altera_jtaguart_ports[co->index].port; -+ if (port->membase == 0) -+ return -ENODEV; -+ return 0; -+} -+ -+static struct uart_driver altera_jtaguart_driver; -+ -+static struct console altera_jtaguart_console = { -+ .name = "ttyJ", -+ .write = altera_jtaguart_console_write, -+ .device = uart_console_device, -+ .setup = altera_jtaguart_console_setup, -+ .flags = CON_PRINTBUFFER, -+ .index = -1, -+ .data = &altera_jtaguart_driver, -+}; -+ -+static int __init altera_jtaguart_console_init(void) -+{ -+ register_console(&altera_jtaguart_console); -+ return 0; -+} -+ -+console_initcall(altera_jtaguart_console_init); -+ -+#define ALTERA_JTAGUART_CONSOLE (&altera_jtaguart_console) -+ -+#else -+ -+#define ALTERA_JTAGUART_CONSOLE NULL -+ -+#endif /* CONFIG_ALTERA_JTAGUART_CONSOLE */ -+ -+static struct uart_driver altera_jtaguart_driver = { -+ .owner = THIS_MODULE, -+ .driver_name = "altera_jtaguart", -+ .dev_name = "ttyJ", -+ .major = ALTERA_JTAGUART_MAJOR, -+ .minor = ALTERA_JTAGUART_MINOR, -+ .nr = ALTERA_JTAGUART_MAXPORTS, -+ .cons = ALTERA_JTAGUART_CONSOLE, -+}; -+ -+static int __devinit altera_jtaguart_probe(struct platform_device *pdev) -+{ -+ struct altera_jtaguart_platform_uart *platp = pdev->dev.platform_data; -+ struct uart_port *port; -+ int i; -+ -+ for (i = 0; i < ALTERA_JTAGUART_MAXPORTS && platp[i].mapbase; i++) { -+ port = &altera_jtaguart_ports[i].port; -+ -+ port->line = i; -+ port->type = PORT_ALTERA_JTAGUART; -+ port->mapbase = platp[i].mapbase; -+ port->membase = ioremap(port->mapbase, ALTERA_JTAGUART_SIZE); -+ port->iotype = SERIAL_IO_MEM; -+ port->irq = platp[i].irq; -+ port->ops = &altera_jtaguart_ops; -+ port->flags = ASYNC_BOOT_AUTOCONF; -+ -+ uart_add_one_port(&altera_jtaguart_driver, port); -+ } -+ -+ return 0; -+} -+ -+static int __devexit altera_jtaguart_remove(struct platform_device *pdev) -+{ -+ struct uart_port *port; -+ int i; -+ -+ for (i = 0; i < ALTERA_JTAGUART_MAXPORTS; i++) { -+ port = &altera_jtaguart_ports[i].port; -+ if (port) -+ uart_remove_one_port(&altera_jtaguart_driver, port); -+ } -+ -+ return 0; -+} -+ -+static struct platform_driver altera_jtaguart_platform_driver = { -+ .probe = altera_jtaguart_probe, -+ .remove = __devexit_p(altera_jtaguart_remove), -+ .driver = { -+ .name = DRV_NAME, -+ .owner = THIS_MODULE, -+ }, -+}; -+ -+static int __init altera_jtaguart_init(void) -+{ -+ int rc; -+ -+ rc = uart_register_driver(&altera_jtaguart_driver); -+ if (rc) -+ return rc; -+ rc = platform_driver_register(&altera_jtaguart_platform_driver); -+ if (rc) { -+ uart_unregister_driver(&altera_jtaguart_driver); -+ return rc; -+ } -+ return 0; -+} -+ -+static void __exit altera_jtaguart_exit(void) -+{ -+ platform_driver_unregister(&altera_jtaguart_platform_driver); -+ uart_unregister_driver(&altera_jtaguart_driver); -+} -+ -+module_init(altera_jtaguart_init); -+module_exit(altera_jtaguart_exit); -+ -+MODULE_DESCRIPTION("Altera JTAG UART driver"); -+MODULE_AUTHOR("Thomas Chou <thomas@wytron.com.tw>"); -+MODULE_LICENSE("GPL"); -+MODULE_ALIAS("platform:" DRV_NAME); ---- /dev/null -+++ b/include/linux/altera_jtaguart.h -@@ -0,0 +1,16 @@ -+/* -+ * altera_jtaguart.h -- Altera JTAG UART driver defines. -+ */ -+ -+#ifndef __ALTJUART_H -+#define __ALTJUART_H -+ -+#define ALTERA_JTAGUART_MAJOR 204 -+#define ALTERA_JTAGUART_MINOR 186 -+ -+struct altera_jtaguart_platform_uart { -+ unsigned long mapbase; /* Physical address base */ -+ unsigned int irq; /* Interrupt vector */ -+}; -+ -+#endif /* __ALTJUART_H */ ---- a/include/linux/serial_core.h -+++ b/include/linux/serial_core.h -@@ -182,6 +182,9 @@ - /* Aeroflex Gaisler GRLIB APBUART */ - #define PORT_APBUART 90 - -+/* Altera UARTs */ -+#define PORT_ALTERA_JTAGUART 91 -+ - #ifdef __KERNEL__ - - #include <linux/compiler.h> diff --git a/tty/serial-add-driver-for-the-altera-uart.patch b/tty/serial-add-driver-for-the-altera-uart.patch deleted file mode 100644 index 11bf748a3e6089..00000000000000 --- a/tty/serial-add-driver-for-the-altera-uart.patch +++ /dev/null @@ -1,668 +0,0 @@ -From tklauser@distanz.ch Thu Apr 22 16:23:33 2010 -From: Tobias Klauser <tklauser@distanz.ch> -Date: Tue, 30 Mar 2010 16:54:42 +0200 -Subject: serial: Add driver for the Altera UART -To: linux-serial@vger.kernel.org, Andrew Morton <akpm@linux-foundation.org> -Cc: Tobias Klauser <tklauser@distanz.ch>, gregkh@suse.de, nios2-dev@sopc.et.ntust.edu.tw, linux-kernel@vger.kernel.org -Message-ID: <4aaf40955bf19f8dbf0afae5d1cb602fc6e8bf0b.1269960350.git.tklauser@distanz.ch> - - -Add an UART driver for the UART component available as a SOPC (System on -Programmable Chip) component for Altera FPGAs. - -Signed-off-by: Tobias Klauser <tklauser@distanz.ch> -Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> - ---- - drivers/serial/Kconfig | 31 ++ - drivers/serial/Makefile | 1 - drivers/serial/altera_uart.c | 570 +++++++++++++++++++++++++++++++++++++++++++ - include/linux/altera_uart.h | 14 + - include/linux/serial_core.h | 1 - 5 files changed, 617 insertions(+) - ---- a/drivers/serial/Kconfig -+++ b/drivers/serial/Kconfig -@@ -1527,4 +1527,35 @@ config SERIAL_ALTERA_JTAGUART_CONSOLE_BY - Bypass console output and keep going even if there is no - JTAG terminal connection with the host. - -+config SERIAL_ALTERA_UART -+ tristate "Altera UART support" -+ select SERIAL_CORE -+ help -+ This driver supports the Altera softcore UART port. -+ -+config SERIAL_ALTERA_UART_MAXPORTS -+ int "Maximum number of Altera UART ports" -+ depends on SERIAL_ALTERA_UART -+ default 4 -+ help -+ This setting lets you define the maximum number of the Altera -+ UART ports. The usual default varies from board to board, and -+ this setting is a way of catering for that. -+ -+config SERIAL_ALTERA_UART_BAUDRATE -+ int "Default baudrate for Altera UART ports" -+ depends on SERIAL_ALTERA_UART -+ default 115200 -+ help -+ This setting lets you define what the default baudrate is for the -+ Altera UART ports. The usual default varies from board to board, -+ and this setting is a way of catering for that. -+ -+config SERIAL_ALTERA_UART_CONSOLE -+ bool "Altera UART console support" -+ depends on SERIAL_ALTERA_UART -+ select SERIAL_CORE_CONSOLE -+ help -+ Enable a Altera UART port to be the system console. -+ - endmenu ---- a/drivers/serial/Makefile -+++ b/drivers/serial/Makefile -@@ -84,3 +84,4 @@ obj-$(CONFIG_SERIAL_QE) += ucc_uart.o - obj-$(CONFIG_SERIAL_TIMBERDALE) += timbuart.o - obj-$(CONFIG_SERIAL_GRLIB_GAISLER_APBUART) += apbuart.o - obj-$(CONFIG_SERIAL_ALTERA_JTAGUART) += altera_jtaguart.o -+obj-$(CONFIG_SERIAL_ALTERA_UART) += altera_uart.o ---- /dev/null -+++ b/drivers/serial/altera_uart.c -@@ -0,0 +1,570 @@ -+/* -+ * altera_uart.c -- Altera UART driver -+ * -+ * Based on mcf.c -- Freescale ColdFire UART driver -+ * -+ * (C) Copyright 2003-2007, Greg Ungerer <gerg@snapgear.com> -+ * (C) Copyright 2008, Thomas Chou <thomas@wytron.com.tw> -+ * (C) Copyright 2010, Tobias Klauser <tklauser@distanz.ch> -+ * -+ * This program is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ */ -+ -+#include <linux/kernel.h> -+#include <linux/init.h> -+#include <linux/interrupt.h> -+#include <linux/module.h> -+#include <linux/console.h> -+#include <linux/tty.h> -+#include <linux/tty_flip.h> -+#include <linux/serial.h> -+#include <linux/serial_core.h> -+#include <linux/platform_device.h> -+#include <linux/io.h> -+#include <linux/altera_uart.h> -+ -+#define DRV_NAME "altera_uart" -+ -+/* -+ * Altera UART register definitions according to the Nios UART datasheet: -+ * http://www.altera.com/literature/ds/ds_nios_uart.pdf -+ */ -+ -+#define ALTERA_UART_SIZE 32 -+ -+#define ALTERA_UART_RXDATA_REG 0 -+#define ALTERA_UART_TXDATA_REG 4 -+#define ALTERA_UART_STATUS_REG 8 -+#define ALTERA_UART_CONTROL_REG 12 -+#define ALTERA_UART_DIVISOR_REG 16 -+#define ALTERA_UART_EOP_REG 20 -+ -+#define ALTERA_UART_STATUS_PE_MSK 0x0001 /* parity error */ -+#define ALTERA_UART_STATUS_FE_MSK 0x0002 /* framing error */ -+#define ALTERA_UART_STATUS_BRK_MSK 0x0004 /* break */ -+#define ALTERA_UART_STATUS_ROE_MSK 0x0008 /* RX overrun error */ -+#define ALTERA_UART_STATUS_TOE_MSK 0x0010 /* TX overrun error */ -+#define ALTERA_UART_STATUS_TMT_MSK 0x0020 /* TX shift register state */ -+#define ALTERA_UART_STATUS_TRDY_MSK 0x0040 /* TX ready */ -+#define ALTERA_UART_STATUS_RRDY_MSK 0x0080 /* RX ready */ -+#define ALTERA_UART_STATUS_E_MSK 0x0100 /* exception condition */ -+#define ALTERA_UART_STATUS_DCTS_MSK 0x0400 /* CTS logic-level change */ -+#define ALTERA_UART_STATUS_CTS_MSK 0x0800 /* CTS logic state */ -+#define ALTERA_UART_STATUS_EOP_MSK 0x1000 /* EOP written/read */ -+ -+ /* Enable interrupt on... */ -+#define ALTERA_UART_CONTROL_PE_MSK 0x0001 /* ...parity error */ -+#define ALTERA_UART_CONTROL_FE_MSK 0x0002 /* ...framing error */ -+#define ALTERA_UART_CONTROL_BRK_MSK 0x0004 /* ...break */ -+#define ALTERA_UART_CONTROL_ROE_MSK 0x0008 /* ...RX overrun */ -+#define ALTERA_UART_CONTROL_TOE_MSK 0x0010 /* ...TX overrun */ -+#define ALTERA_UART_CONTROL_TMT_MSK 0x0020 /* ...TX shift register empty */ -+#define ALTERA_UART_CONTROL_TRDY_MSK 0x0040 /* ...TX ready */ -+#define ALTERA_UART_CONTROL_RRDY_MSK 0x0080 /* ...RX ready */ -+#define ALTERA_UART_CONTROL_E_MSK 0x0100 /* ...exception*/ -+ -+#define ALTERA_UART_CONTROL_TRBK_MSK 0x0200 /* TX break */ -+#define ALTERA_UART_CONTROL_DCTS_MSK 0x0400 /* Interrupt on CTS change */ -+#define ALTERA_UART_CONTROL_RTS_MSK 0x0800 /* RTS signal */ -+#define ALTERA_UART_CONTROL_EOP_MSK 0x1000 /* Interrupt on EOP */ -+ -+/* -+ * Local per-uart structure. -+ */ -+struct altera_uart { -+ struct uart_port port; -+ unsigned int sigs; /* Local copy of line sigs */ -+ unsigned short imr; /* Local IMR mirror */ -+}; -+ -+static unsigned int altera_uart_tx_empty(struct uart_port *port) -+{ -+ return (readl(port->membase + ALTERA_UART_STATUS_REG) & -+ ALTERA_UART_STATUS_TMT_MSK) ? TIOCSER_TEMT : 0; -+} -+ -+static unsigned int altera_uart_get_mctrl(struct uart_port *port) -+{ -+ struct altera_uart *pp = container_of(port, struct altera_uart, port); -+ unsigned long flags; -+ unsigned int sigs; -+ -+ spin_lock_irqsave(&port->lock, flags); -+ sigs = -+ (readl(port->membase + ALTERA_UART_STATUS_REG) & -+ ALTERA_UART_STATUS_CTS_MSK) ? TIOCM_CTS : 0; -+ sigs |= (pp->sigs & TIOCM_RTS); -+ spin_unlock_irqrestore(&port->lock, flags); -+ -+ return sigs; -+} -+ -+static void altera_uart_set_mctrl(struct uart_port *port, unsigned int sigs) -+{ -+ struct altera_uart *pp = container_of(port, struct altera_uart, port); -+ unsigned long flags; -+ -+ spin_lock_irqsave(&port->lock, flags); -+ pp->sigs = sigs; -+ if (sigs & TIOCM_RTS) -+ pp->imr |= ALTERA_UART_CONTROL_RTS_MSK; -+ else -+ pp->imr &= ~ALTERA_UART_CONTROL_RTS_MSK; -+ writel(pp->imr, port->membase + ALTERA_UART_CONTROL_REG); -+ spin_unlock_irqrestore(&port->lock, flags); -+} -+ -+static void altera_uart_start_tx(struct uart_port *port) -+{ -+ struct altera_uart *pp = container_of(port, struct altera_uart, port); -+ unsigned long flags; -+ -+ spin_lock_irqsave(&port->lock, flags); -+ pp->imr |= ALTERA_UART_CONTROL_TRDY_MSK; -+ writel(pp->imr, port->membase + ALTERA_UART_CONTROL_REG); -+ spin_unlock_irqrestore(&port->lock, flags); -+} -+ -+static void altera_uart_stop_tx(struct uart_port *port) -+{ -+ struct altera_uart *pp = container_of(port, struct altera_uart, port); -+ unsigned long flags; -+ -+ spin_lock_irqsave(&port->lock, flags); -+ pp->imr &= ~ALTERA_UART_CONTROL_TRDY_MSK; -+ writel(pp->imr, port->membase + ALTERA_UART_CONTROL_REG); -+ spin_unlock_irqrestore(&port->lock, flags); -+} -+ -+static void altera_uart_stop_rx(struct uart_port *port) -+{ -+ struct altera_uart *pp = container_of(port, struct altera_uart, port); -+ unsigned long flags; -+ -+ spin_lock_irqsave(&port->lock, flags); -+ pp->imr &= ~ALTERA_UART_CONTROL_RRDY_MSK; -+ writel(pp->imr, port->membase + ALTERA_UART_CONTROL_REG); -+ spin_unlock_irqrestore(&port->lock, flags); -+} -+ -+static void altera_uart_break_ctl(struct uart_port *port, int break_state) -+{ -+ struct altera_uart *pp = container_of(port, struct altera_uart, port); -+ unsigned long flags; -+ -+ spin_lock_irqsave(&port->lock, flags); -+ if (break_state == -1) -+ pp->imr |= ALTERA_UART_CONTROL_TRBK_MSK; -+ else -+ pp->imr &= ~ALTERA_UART_CONTROL_TRBK_MSK; -+ writel(pp->imr, port->membase + ALTERA_UART_CONTROL_REG); -+ spin_unlock_irqrestore(&port->lock, flags); -+} -+ -+static void altera_uart_enable_ms(struct uart_port *port) -+{ -+} -+ -+static void altera_uart_set_termios(struct uart_port *port, -+ struct ktermios *termios, -+ struct ktermios *old) -+{ -+ unsigned long flags; -+ unsigned int baud, baudclk; -+ -+ baud = uart_get_baud_rate(port, termios, old, 0, 4000000); -+ baudclk = port->uartclk / baud; -+ -+ if (old) -+ tty_termios_copy_hw(termios, old); -+ tty_termios_encode_baud_rate(termios, baud, baud); -+ -+ spin_lock_irqsave(&port->lock, flags); -+ writel(baudclk, port->membase + ALTERA_UART_DIVISOR_REG); -+ spin_unlock_irqrestore(&port->lock, flags); -+} -+ -+static void altera_uart_rx_chars(struct altera_uart *pp) -+{ -+ struct uart_port *port = &pp->port; -+ unsigned char ch, flag; -+ unsigned short status; -+ -+ while ((status = readl(port->membase + ALTERA_UART_STATUS_REG)) & -+ ALTERA_UART_STATUS_RRDY_MSK) { -+ ch = readl(port->membase + ALTERA_UART_RXDATA_REG); -+ flag = TTY_NORMAL; -+ port->icount.rx++; -+ -+ if (status & ALTERA_UART_STATUS_E_MSK) { -+ writel(status, port->membase + ALTERA_UART_STATUS_REG); -+ -+ if (status & ALTERA_UART_STATUS_BRK_MSK) { -+ port->icount.brk++; -+ if (uart_handle_break(port)) -+ continue; -+ } else if (status & ALTERA_UART_STATUS_PE_MSK) { -+ port->icount.parity++; -+ } else if (status & ALTERA_UART_STATUS_ROE_MSK) { -+ port->icount.overrun++; -+ } else if (status & ALTERA_UART_STATUS_FE_MSK) { -+ port->icount.frame++; -+ } -+ -+ status &= port->read_status_mask; -+ -+ if (status & ALTERA_UART_STATUS_BRK_MSK) -+ flag = TTY_BREAK; -+ else if (status & ALTERA_UART_STATUS_PE_MSK) -+ flag = TTY_PARITY; -+ else if (status & ALTERA_UART_STATUS_FE_MSK) -+ flag = TTY_FRAME; -+ } -+ -+ if (uart_handle_sysrq_char(port, ch)) -+ continue; -+ uart_insert_char(port, status, ALTERA_UART_STATUS_ROE_MSK, ch, -+ flag); -+ } -+ -+ tty_flip_buffer_push(port->state->port.tty); -+} -+ -+static void altera_uart_tx_chars(struct altera_uart *pp) -+{ -+ struct uart_port *port = &pp->port; -+ struct circ_buf *xmit = &port->state->xmit; -+ -+ if (port->x_char) { -+ /* Send special char - probably flow control */ -+ writel(port->x_char, port->membase + ALTERA_UART_TXDATA_REG); -+ port->x_char = 0; -+ port->icount.tx++; -+ return; -+ } -+ -+ while (readl(port->membase + ALTERA_UART_STATUS_REG) & -+ ALTERA_UART_STATUS_TRDY_MSK) { -+ if (xmit->head == xmit->tail) -+ break; -+ writel(xmit->buf[xmit->tail], -+ port->membase + ALTERA_UART_TXDATA_REG); -+ xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); -+ port->icount.tx++; -+ } -+ -+ if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) -+ uart_write_wakeup(port); -+ -+ if (xmit->head == xmit->tail) { -+ pp->imr &= ~ALTERA_UART_CONTROL_TRDY_MSK; -+ writel(pp->imr, port->membase + ALTERA_UART_CONTROL_REG); -+ } -+} -+ -+static irqreturn_t altera_uart_interrupt(int irq, void *data) -+{ -+ struct uart_port *port = data; -+ struct altera_uart *pp = container_of(port, struct altera_uart, port); -+ unsigned int isr; -+ -+ isr = readl(port->membase + ALTERA_UART_STATUS_REG) & pp->imr; -+ if (isr & ALTERA_UART_STATUS_RRDY_MSK) -+ altera_uart_rx_chars(pp); -+ if (isr & ALTERA_UART_STATUS_TRDY_MSK) -+ altera_uart_tx_chars(pp); -+ return IRQ_RETVAL(isr); -+} -+ -+static void altera_uart_config_port(struct uart_port *port, int flags) -+{ -+ port->type = PORT_ALTERA_UART; -+ -+ /* Clear mask, so no surprise interrupts. */ -+ writel(0, port->membase + ALTERA_UART_CONTROL_REG); -+ /* Clear status register */ -+ writel(0, port->membase + ALTERA_UART_STATUS_REG); -+} -+ -+static int altera_uart_startup(struct uart_port *port) -+{ -+ struct altera_uart *pp = container_of(port, struct altera_uart, port); -+ unsigned long flags; -+ int ret; -+ -+ ret = request_irq(port->irq, altera_uart_interrupt, IRQF_DISABLED, -+ DRV_NAME, port); -+ if (ret) { -+ pr_err(DRV_NAME ": unable to attach Altera UART %d " -+ "interrupt vector=%d\n", port->line, port->irq); -+ return ret; -+ } -+ -+ spin_lock_irqsave(&port->lock, flags); -+ -+ /* Enable RX interrupts now */ -+ pp->imr = ALTERA_UART_CONTROL_RRDY_MSK; -+ writel(pp->imr, port->membase + ALTERA_UART_CONTROL_REG); -+ -+ spin_unlock_irqrestore(&port->lock, flags); -+ -+ return 0; -+} -+ -+static void altera_uart_shutdown(struct uart_port *port) -+{ -+ struct altera_uart *pp = container_of(port, struct altera_uart, port); -+ unsigned long flags; -+ -+ spin_lock_irqsave(&port->lock, flags); -+ -+ /* Disable all interrupts now */ -+ pp->imr = 0; -+ writel(pp->imr, port->membase + ALTERA_UART_CONTROL_REG); -+ -+ spin_unlock_irqrestore(&port->lock, flags); -+ -+ free_irq(port->irq, port); -+} -+ -+static const char *altera_uart_type(struct uart_port *port) -+{ -+ return (port->type == PORT_ALTERA_UART) ? "Altera UART" : NULL; -+} -+ -+static int altera_uart_request_port(struct uart_port *port) -+{ -+ /* UARTs always present */ -+ return 0; -+} -+ -+static void altera_uart_release_port(struct uart_port *port) -+{ -+ /* Nothing to release... */ -+} -+ -+static int altera_uart_verify_port(struct uart_port *port, -+ struct serial_struct *ser) -+{ -+ if ((ser->type != PORT_UNKNOWN) && (ser->type != PORT_ALTERA_UART)) -+ return -EINVAL; -+ return 0; -+} -+ -+/* -+ * Define the basic serial functions we support. -+ */ -+static struct uart_ops altera_uart_ops = { -+ .tx_empty = altera_uart_tx_empty, -+ .get_mctrl = altera_uart_get_mctrl, -+ .set_mctrl = altera_uart_set_mctrl, -+ .start_tx = altera_uart_start_tx, -+ .stop_tx = altera_uart_stop_tx, -+ .stop_rx = altera_uart_stop_rx, -+ .enable_ms = altera_uart_enable_ms, -+ .break_ctl = altera_uart_break_ctl, -+ .startup = altera_uart_startup, -+ .shutdown = altera_uart_shutdown, -+ .set_termios = altera_uart_set_termios, -+ .type = altera_uart_type, -+ .request_port = altera_uart_request_port, -+ .release_port = altera_uart_release_port, -+ .config_port = altera_uart_config_port, -+ .verify_port = altera_uart_verify_port, -+}; -+ -+static struct altera_uart altera_uart_ports[CONFIG_SERIAL_ALTERA_UART_MAXPORTS]; -+ -+#if defined(CONFIG_SERIAL_ALTERA_UART_CONSOLE) -+ -+int __init early_altera_uart_setup(struct altera_uart_platform_uart *platp) -+{ -+ struct uart_port *port; -+ int i; -+ -+ for (i = 0; i < CONFIG_SERIAL_ALTERA_UART_MAXPORTS && platp[i].mapbase; i++) { -+ port = &altera_uart_ports[i].port; -+ -+ port->line = i; -+ port->type = PORT_ALTERA_UART; -+ port->mapbase = platp[i].mapbase; -+ port->membase = ioremap(port->mapbase, ALTERA_UART_SIZE); -+ port->iotype = SERIAL_IO_MEM; -+ port->irq = platp[i].irq; -+ port->uartclk = platp[i].uartclk; -+ port->flags = ASYNC_BOOT_AUTOCONF; -+ port->ops = &altera_uart_ops; -+ } -+ -+ return 0; -+} -+ -+static void altera_uart_console_putc(struct console *co, const char c) -+{ -+ struct uart_port *port = &(altera_uart_ports + co->index)->port; -+ int i; -+ -+ for (i = 0; i < 0x10000; i++) { -+ if (readl(port->membase + ALTERA_UART_STATUS_REG) & -+ ALTERA_UART_STATUS_TRDY_MSK) -+ break; -+ } -+ writel(c, port->membase + ALTERA_UART_TXDATA_REG); -+ for (i = 0; i < 0x10000; i++) { -+ if (readl(port->membase + ALTERA_UART_STATUS_REG) & -+ ALTERA_UART_STATUS_TRDY_MSK) -+ break; -+ } -+} -+ -+static void altera_uart_console_write(struct console *co, const char *s, -+ unsigned int count) -+{ -+ for (; count; count--, s++) { -+ altera_uart_console_putc(co, *s); -+ if (*s == '\n') -+ altera_uart_console_putc(co, '\r'); -+ } -+} -+ -+static int __init altera_uart_console_setup(struct console *co, char *options) -+{ -+ struct uart_port *port; -+ int baud = CONFIG_SERIAL_ALTERA_UART_BAUDRATE; -+ int bits = 8; -+ int parity = 'n'; -+ int flow = 'n'; -+ -+ if (co->index < 0 || co->index >= CONFIG_SERIAL_ALTERA_UART_MAXPORTS) -+ return -EINVAL; -+ port = &altera_uart_ports[co->index].port; -+ if (port->membase == 0) -+ return -ENODEV; -+ -+ if (options) -+ uart_parse_options(options, &baud, &parity, &bits, &flow); -+ -+ return uart_set_options(port, co, baud, parity, bits, flow); -+} -+ -+static struct uart_driver altera_uart_driver; -+ -+static struct console altera_uart_console = { -+ .name = "ttyS", -+ .write = altera_uart_console_write, -+ .device = uart_console_device, -+ .setup = altera_uart_console_setup, -+ .flags = CON_PRINTBUFFER, -+ .index = -1, -+ .data = &altera_uart_driver, -+}; -+ -+static int __init altera_uart_console_init(void) -+{ -+ register_console(&altera_uart_console); -+ return 0; -+} -+ -+console_initcall(altera_uart_console_init); -+ -+#define ALTERA_UART_CONSOLE (&altera_uart_console) -+ -+#else -+ -+#define ALTERA_UART_CONSOLE NULL -+ -+#endif /* CONFIG_ALTERA_UART_CONSOLE */ -+ -+/* -+ * Define the altera_uart UART driver structure. -+ */ -+static struct uart_driver altera_uart_driver = { -+ .owner = THIS_MODULE, -+ .driver_name = DRV_NAME, -+ .dev_name = "ttyS", -+ .major = TTY_MAJOR, -+ .minor = 64, -+ .nr = CONFIG_SERIAL_ALTERA_UART_MAXPORTS, -+ .cons = ALTERA_UART_CONSOLE, -+}; -+ -+static int __devinit altera_uart_probe(struct platform_device *pdev) -+{ -+ struct altera_uart_platform_uart *platp = pdev->dev.platform_data; -+ struct uart_port *port; -+ int i; -+ -+ for (i = 0; i < CONFIG_SERIAL_ALTERA_UART_MAXPORTS && platp[i].mapbase; i++) { -+ port = &altera_uart_ports[i].port; -+ -+ port->line = i; -+ port->type = PORT_ALTERA_UART; -+ port->mapbase = platp[i].mapbase; -+ port->membase = ioremap(port->mapbase, ALTERA_UART_SIZE); -+ port->iotype = SERIAL_IO_MEM; -+ port->irq = platp[i].irq; -+ port->uartclk = platp[i].uartclk; -+ port->ops = &altera_uart_ops; -+ port->flags = ASYNC_BOOT_AUTOCONF; -+ -+ uart_add_one_port(&altera_uart_driver, port); -+ } -+ -+ return 0; -+} -+ -+static int altera_uart_remove(struct platform_device *pdev) -+{ -+ struct uart_port *port; -+ int i; -+ -+ for (i = 0; i < CONFIG_SERIAL_ALTERA_UART_MAXPORTS; i++) { -+ port = &altera_uart_ports[i].port; -+ if (port) -+ uart_remove_one_port(&altera_uart_driver, port); -+ } -+ -+ return 0; -+} -+ -+static struct platform_driver altera_uart_platform_driver = { -+ .probe = altera_uart_probe, -+ .remove = __devexit_p(altera_uart_remove), -+ .driver = { -+ .name = DRV_NAME, -+ .owner = THIS_MODULE, -+ .pm = NULL, -+ }, -+}; -+ -+static int __init altera_uart_init(void) -+{ -+ int rc; -+ -+ rc = uart_register_driver(&altera_uart_driver); -+ if (rc) -+ return rc; -+ rc = platform_driver_register(&altera_uart_platform_driver); -+ if (rc) { -+ uart_unregister_driver(&altera_uart_driver); -+ return rc; -+ } -+ return 0; -+} -+ -+static void __exit altera_uart_exit(void) -+{ -+ platform_driver_unregister(&altera_uart_platform_driver); -+ uart_unregister_driver(&altera_uart_driver); -+} -+ -+module_init(altera_uart_init); -+module_exit(altera_uart_exit); -+ -+MODULE_DESCRIPTION("Altera UART driver"); -+MODULE_AUTHOR("Thomas Chou <thomas@wytron.com.tw>"); -+MODULE_LICENSE("GPL"); -+MODULE_ALIAS("platform:" DRV_NAME); ---- /dev/null -+++ b/include/linux/altera_uart.h -@@ -0,0 +1,14 @@ -+/* -+ * altera_uart.h -- Altera UART driver defines. -+ */ -+ -+#ifndef __ALTUART_H -+#define __ALTUART_H -+ -+struct altera_uart_platform_uart { -+ unsigned long mapbase; /* Physical address base */ -+ unsigned int irq; /* Interrupt vector */ -+ unsigned int uartclk; /* UART clock rate */ -+}; -+ -+#endif /* __ALTUART_H */ ---- a/include/linux/serial_core.h -+++ b/include/linux/serial_core.h -@@ -184,6 +184,7 @@ - - /* Altera UARTs */ - #define PORT_ALTERA_JTAGUART 91 -+#define PORT_ALTERA_UART 92 - - #ifdef __KERNEL__ - diff --git a/tty/tty-n_gsm-line-discipline.patch b/tty/tty-n_gsm-line-discipline.patch new file mode 100644 index 00000000000000..a91bd12944b155 --- /dev/null +++ b/tty/tty-n_gsm-line-discipline.patch @@ -0,0 +1,2869 @@ +From alan@linux.intel.com Wed Apr 28 12:34:26 2010 +From: Alan Cox <alan@linux.intel.com> +Date: Fri, 26 Mar 2010 11:32:54 +0000 +Subject: [PATCH] tty: n_gsm line discipline +To: greg@kroah.com, linux-serial@vger.kernel.org, linux.kernel@vger.kernel.org +Message-ID: <20100326113205.8913.49767.stgit@localhost.localdomain> + + +Add an implementation of GSM 0710 MUX. The implementation currently supports + +- Basic and advanced framing (as either end of the link) +- UI or UIH data frames +- Adaption layer 1-4 (1 and 2 via tty, 3 and 4 as skbuff lists) +- Modem and control messages including the correct retry process +- Flow control + +and exposes the MUX channels as a set of virtual tty devices including modem +signals. This is an experimental driver. + +Signed-off-by: Alan Cox <alan@linux.intel.com> +Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> + +--- + drivers/char/Kconfig | 9 + drivers/char/Makefile | 1 + drivers/char/n_gsm.c | 2763 +++++++++++++++++++++++++++++++++++++++++++++++++ + include/linux/gsmmux.h | 25 + include/linux/tty.h | 3 + 5 files changed, 2799 insertions(+), 2 deletions(-) + +--- a/drivers/char/Kconfig ++++ b/drivers/char/Kconfig +@@ -276,11 +276,18 @@ config N_HDLC + Allows synchronous HDLC communications with tty device drivers that + support synchronous HDLC such as the Microgate SyncLink adapter. + +- This driver can only be built as a module ( = code which can be ++ This driver can be built as a module ( = code which can be + inserted in and removed from the running kernel whenever you want). + The module will be called n_hdlc. If you want to do that, say M + here. + ++config N_GSM ++ tristate "GSM MUX line discipline support (EXPERIMENTAL)" ++ depends on EXPERIMENTAL ++ help ++ This line discipline provides support for the GSM MUX protocol and ++ presents the mux as a set of 61 individual tty devices. ++ + config RISCOM8 + tristate "SDL RISCom/8 card support" + depends on SERIAL_NONSTANDARD +--- a/drivers/char/Makefile ++++ b/drivers/char/Makefile +@@ -40,6 +40,7 @@ obj-$(CONFIG_SYNCLINK) += synclink.o + obj-$(CONFIG_SYNCLINKMP) += synclinkmp.o + obj-$(CONFIG_SYNCLINK_GT) += synclink_gt.o + obj-$(CONFIG_N_HDLC) += n_hdlc.o ++obj-$(CONFIG_N_GSM) += n_gsm.o + obj-$(CONFIG_AMIGA_BUILTIN_SERIAL) += amiserial.o + obj-$(CONFIG_SX) += sx.o generic_serial.o + obj-$(CONFIG_RIO) += rio/ generic_serial.o +--- /dev/null ++++ b/drivers/char/n_gsm.c +@@ -0,0 +1,2763 @@ ++/* ++ * n_gsm.c GSM 0710 tty multiplexor ++ * Copyright (c) 2009/10 Intel Corporation ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU General Public License version 2 as ++ * published by the Free Software Foundation. ++ * ++ * This program is distributed in the hope that it will be useful, ++ * but WITHOUT ANY WARRANTY; without even the implied warranty of ++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ++ * GNU General Public License for more details. ++ * ++ * You should have received a copy of the GNU General Public License ++ * along with this program; if not, write to the Free Software ++ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. ++ * ++ * * THIS IS A DEVELOPMENT SNAPSHOT IT IS NOT A FINAL RELEASE * ++ * ++ * TO DO: ++ * Mostly done: ioctls for setting modes/timing ++ * Partly done: hooks so you can pull off frames to non tty devs ++ * Restart DLCI 0 when it closes ? ++ * Test basic encoding ++ * Improve the tx engine ++ * Resolve tx side locking by adding a queue_head and routing ++ * all control traffic via it ++ * General tidy/document ++ * Review the locking/move to refcounts more (mux now moved to an ++ * alloc/free model ready) ++ * Use newest tty open/close port helpers and install hooks ++ * What to do about power functions ? ++ * Termios setting and negotiation ++ * Do we need a 'which mux are you' ioctl to correlate mux and tty sets ++ * ++ */ ++ ++#include <linux/types.h> ++#include <linux/major.h> ++#include <linux/errno.h> ++#include <linux/signal.h> ++#include <linux/fcntl.h> ++#include <linux/sched.h> ++#include <linux/interrupt.h> ++#include <linux/tty.h> ++#include <linux/timer.h> ++#include <linux/ctype.h> ++#include <linux/mm.h> ++#include <linux/string.h> ++#include <linux/slab.h> ++#include <linux/poll.h> ++#include <linux/bitops.h> ++#include <linux/file.h> ++#include <linux/uaccess.h> ++#include <linux/module.h> ++#include <linux/timer.h> ++#include <linux/tty_flip.h> ++#include <linux/tty_driver.h> ++#include <linux/serial.h> ++#include <linux/kfifo.h> ++#include <linux/skbuff.h> ++#include <linux/gsmmux.h> ++ ++static int debug; ++module_param(debug, int, 0600); ++ ++#define T1 (HZ/10) ++#define T2 (HZ/3) ++#define N2 3 ++ ++/* Use long timers for testing at low speed with debug on */ ++#ifdef DEBUG_TIMING ++#define T1 HZ ++#define T2 (2 * HZ) ++#endif ++ ++/* Semi-arbitary buffer size limits. 0710 is normally run with 32-64 byte ++ limits so this is plenty */ ++#define MAX_MRU 512 ++#define MAX_MTU 512 ++ ++/* ++ * Each block of data we have queued to go out is in the form of ++ * a gsm_msg which holds everything we need in a link layer independant ++ * format ++ */ ++ ++struct gsm_msg { ++ struct gsm_msg *next; ++ u8 addr; /* DLCI address + flags */ ++ u8 ctrl; /* Control byte + flags */ ++ unsigned int len; /* Length of data block (can be zero) */ ++ unsigned char *data; /* Points into buffer but not at the start */ ++ unsigned char buffer[0]; ++}; ++ ++/* ++ * Each active data link has a gsm_dlci structure associated which ties ++ * the link layer to an optional tty (if the tty side is open). To avoid ++ * complexity right now these are only ever freed up when the mux is ++ * shut down. ++ * ++ * At the moment we don't free DLCI objects until the mux is torn down ++ * this avoid object life time issues but might be worth review later. ++ */ ++ ++struct gsm_dlci { ++ struct gsm_mux *gsm; ++ int addr; ++ int state; ++#define DLCI_CLOSED 0 ++#define DLCI_OPENING 1 /* Sending SABM not seen UA */ ++#define DLCI_OPEN 2 /* SABM/UA complete */ ++#define DLCI_CLOSING 3 /* Sending DISC not seen UA/DM */ ++ ++ /* Link layer */ ++ spinlock_t lock; /* Protects the internal state */ ++ struct timer_list t1; /* Retransmit timer for SABM and UA */ ++ int retries; ++ /* Uplink tty if active */ ++ struct tty_port port; /* The tty bound to this DLCI if there is one */ ++ struct kfifo *fifo; /* Queue fifo for the DLCI */ ++ struct kfifo _fifo; /* For new fifo API porting only */ ++ int adaption; /* Adaption layer in use */ ++ u32 modem_rx; /* Our incoming virtual modem lines */ ++ u32 modem_tx; /* Our outgoing modem lines */ ++ int dead; /* Refuse re-open */ ++ /* Flow control */ ++ int throttled; /* Private copy of throttle state */ ++ int constipated; /* Throttle status for outgoing */ ++ /* Packetised I/O */ ++ struct sk_buff *skb; /* Frame being sent */ ++ struct sk_buff_head skb_list; /* Queued frames */ ++ /* Data handling callback */ ++ void (*data)(struct gsm_dlci *dlci, u8 *data, int len); ++}; ++ ++/* DLCI 0, 62/63 are special or reseved see gsmtty_open */ ++ ++#define NUM_DLCI 64 ++ ++/* ++ * DLCI 0 is used to pass control blocks out of band of the data ++ * flow (and with a higher link priority). One command can be outstanding ++ * at a time and we use this structure to manage them. They are created ++ * and destroyed by the user context, and updated by the receive paths ++ * and timers ++ */ ++ ++struct gsm_control { ++ u8 cmd; /* Command we are issuing */ ++ u8 *data; /* Data for the command in case we retransmit */ ++ int len; /* Length of block for retransmission */ ++ int done; /* Done flag */ ++ int error; /* Error if any */ ++}; ++ ++/* ++ * Each GSM mux we have is represented by this structure. If we are ++ * operating as an ldisc then we use this structure as our ldisc ++ * state. We need to sort out lifetimes and locking with respect ++ * to the gsm mux array. For now we don't free DLCI objects that ++ * have been instantiated until the mux itself is terminated. ++ * ++ * To consider further: tty open versus mux shutdown. ++ */ ++ ++struct gsm_mux { ++ struct tty_struct *tty; /* The tty our ldisc is bound to */ ++ spinlock_t lock; ++ ++ /* Events on the GSM channel */ ++ wait_queue_head_t event; ++ ++ /* Bits for GSM mode decoding */ ++ ++ /* Framing Layer */ ++ unsigned char *buf; ++ int state; ++#define GSM_SEARCH 0 ++#define GSM_START 1 ++#define GSM_ADDRESS 2 ++#define GSM_CONTROL 3 ++#define GSM_LEN 4 ++#define GSM_DATA 5 ++#define GSM_FCS 6 ++#define GSM_OVERRUN 7 ++ unsigned int len; ++ unsigned int address; ++ unsigned int count; ++ int escape; ++ int encoding; ++ u8 control; ++ u8 fcs; ++ u8 *txframe; /* TX framing buffer */ ++ ++ /* Methods for the receiver side */ ++ void (*receive)(struct gsm_mux *gsm, u8 ch); ++ void (*error)(struct gsm_mux *gsm, u8 ch, u8 flag); ++ /* And transmit side */ ++ int (*output)(struct gsm_mux *mux, u8 *data, int len); ++ ++ /* Link Layer */ ++ unsigned int mru; ++ unsigned int mtu; ++ int initiator; /* Did we initiate connection */ ++ int dead; /* Has the mux been shut down */ ++ struct gsm_dlci *dlci[NUM_DLCI]; ++ int constipated; /* Asked by remote to shut up */ ++ ++ spinlock_t tx_lock; ++ unsigned int tx_bytes; /* TX data outstanding */ ++#define TX_THRESH_HI 8192 ++#define TX_THRESH_LO 2048 ++ struct gsm_msg *tx_head; /* Pending data packets */ ++ struct gsm_msg *tx_tail; ++ ++ /* Control messages */ ++ struct timer_list t2_timer; /* Retransmit timer for commands */ ++ int cretries; /* Command retry counter */ ++ struct gsm_control *pending_cmd;/* Our current pending command */ ++ spinlock_t control_lock; /* Protects the pending command */ ++ ++ /* Configuration */ ++ int adaption; /* 1 or 2 supported */ ++ u8 ftype; /* UI or UIH */ ++ int t1, t2; /* Timers in 1/100th of a sec */ ++ int n2; /* Retry count */ ++ ++ /* Statistics (not currently exposed) */ ++ unsigned long bad_fcs; ++ unsigned long malformed; ++ unsigned long io_error; ++ unsigned long bad_size; ++ unsigned long unsupported; ++}; ++ ++ ++/* ++ * Mux objects - needed so that we can translate a tty index into the ++ * relevant mux and DLCI. ++ */ ++ ++#define MAX_MUX 4 /* 256 minors */ ++static struct gsm_mux *gsm_mux[MAX_MUX]; /* GSM muxes */ ++static spinlock_t gsm_mux_lock; ++ ++/* ++ * This section of the driver logic implements the GSM encodings ++ * both the basic and the 'advanced'. Reliable transport is not ++ * supported. ++ */ ++ ++#define CR 0x02 ++#define EA 0x01 ++#define PF 0x10 ++ ++/* I is special: the rest are ..*/ ++#define RR 0x01 ++#define UI 0x03 ++#define RNR 0x05 ++#define REJ 0x09 ++#define DM 0x0F ++#define SABM 0x2F ++#define DISC 0x43 ++#define UA 0x63 ++#define UIH 0xEF ++ ++/* Channel commands */ ++#define CMD_NSC 0x09 ++#define CMD_TEST 0x11 ++#define CMD_PSC 0x21 ++#define CMD_RLS 0x29 ++#define CMD_FCOFF 0x31 ++#define CMD_PN 0x41 ++#define CMD_RPN 0x49 ++#define CMD_FCON 0x51 ++#define CMD_CLD 0x61 ++#define CMD_SNC 0x69 ++#define CMD_MSC 0x71 ++ ++/* Virtual modem bits */ ++#define MDM_FC 0x01 ++#define MDM_RTC 0x02 ++#define MDM_RTR 0x04 ++#define MDM_IC 0x20 ++#define MDM_DV 0x40 ++ ++#define GSM0_SOF 0xF9 ++#define GSM1_SOF 0x7E ++#define GSM1_ESCAPE 0x7D ++#define GSM1_ESCAPE_BITS 0x20 ++#define XON 0x11 ++#define XOFF 0x13 ++ ++static const struct tty_port_operations gsm_port_ops; ++ ++/* ++ * CRC table for GSM 0710 ++ */ ++ ++static const u8 gsm_fcs8[256] = { ++ 0x00, 0x91, 0xE3, 0x72, 0x07, 0x96, 0xE4, 0x75, ++ 0x0E, 0x9F, 0xED, 0x7C, 0x09, 0x98, 0xEA, 0x7B, ++ 0x1C, 0x8D, 0xFF, 0x6E, 0x1B, 0x8A, 0xF8, 0x69, ++ 0x12, 0x83, 0xF1, 0x60, 0x15, 0x84, 0xF6, 0x67, ++ 0x38, 0xA9, 0xDB, 0x4A, 0x3F, 0xAE, 0xDC, 0x4D, ++ 0x36, 0xA7, 0xD5, 0x44, 0x31, 0xA0, 0xD2, 0x43, ++ 0x24, 0xB5, 0xC7, 0x56, 0x23, 0xB2, 0xC0, 0x51, ++ 0x2A, 0xBB, 0xC9, 0x58, 0x2D, 0xBC, 0xCE, 0x5F, ++ 0x70, 0xE1, 0x93, 0x02, 0x77, 0xE6, 0x94, 0x05, ++ 0x7E, 0xEF, 0x9D, 0x0C, 0x79, 0xE8, 0x9A, 0x0B, ++ 0x6C, 0xFD, 0x8F, 0x1E, 0x6B, 0xFA, 0x88, 0x19, ++ 0x62, 0xF3, 0x81, 0x10, 0x65, 0xF4, 0x86, 0x17, ++ 0x48, 0xD9, 0xAB, 0x3A, 0x4F, 0xDE, 0xAC, 0x3D, ++ 0x46, 0xD7, 0xA5, 0x34, 0x41, 0xD0, 0xA2, 0x33, ++ 0x54, 0xC5, 0xB7, 0x26, 0x53, 0xC2, 0xB0, 0x21, ++ 0x5A, 0xCB, 0xB9, 0x28, 0x5D, 0xCC, 0xBE, 0x2F, ++ 0xE0, 0x71, 0x03, 0x92, 0xE7, 0x76, 0x04, 0x95, ++ 0xEE, 0x7F, 0x0D, 0x9C, 0xE9, 0x78, 0x0A, 0x9B, ++ 0xFC, 0x6D, 0x1F, 0x8E, 0xFB, 0x6A, 0x18, 0x89, ++ 0xF2, 0x63, 0x11, 0x80, 0xF5, 0x64, 0x16, 0x87, ++ 0xD8, 0x49, 0x3B, 0xAA, 0xDF, 0x4E, 0x3C, 0xAD, ++ 0xD6, 0x47, 0x35, 0xA4, 0xD1, 0x40, 0x32, 0xA3, ++ 0xC4, 0x55, 0x27, 0xB6, 0xC3, 0x52, 0x20, 0xB1, ++ 0xCA, 0x5B, 0x29, 0xB8, 0xCD, 0x5C, 0x2E, 0xBF, ++ 0x90, 0x01, 0x73, 0xE2, 0x97, 0x06, 0x74, 0xE5, ++ 0x9E, 0x0F, 0x7D, 0xEC, 0x99, 0x08, 0x7A, 0xEB, ++ 0x8C, 0x1D, 0x6F, 0xFE, 0x8B, 0x1A, 0x68, 0xF9, ++ 0x82, 0x13, 0x61, 0xF0, 0x85, 0x14, 0x66, 0xF7, ++ 0xA8, 0x39, 0x4B, 0xDA, 0xAF, 0x3E, 0x4C, 0xDD, ++ 0xA6, 0x37, 0x45, 0xD4, 0xA1, 0x30, 0x42, 0xD3, ++ 0xB4, 0x25, 0x57, 0xC6, 0xB3, 0x22, 0x50, 0xC1, ++ 0xBA, 0x2B, 0x59, 0xC8, 0xBD, 0x2C, 0x5E, 0xCF ++}; ++ ++#define INIT_FCS 0xFF ++#define GOOD_FCS 0xCF ++ ++/** ++ * gsm_fcs_add - update FCS ++ * @fcs: Current FCS ++ * @c: Next data ++ * ++ * Update the FCS to include c. Uses the algorithm in the specification ++ * notes. ++ */ ++ ++static inline u8 gsm_fcs_add(u8 fcs, u8 c) ++{ ++ return gsm_fcs8[fcs ^ c]; ++} ++ ++/** ++ * gsm_fcs_add_block - update FCS for a block ++ * @fcs: Current FCS ++ * @c: buffer of data ++ * @len: length of buffer ++ * ++ * Update the FCS to include c. Uses the algorithm in the specification ++ * notes. ++ */ ++ ++static inline u8 gsm_fcs_add_block(u8 fcs, u8 *c, int len) ++{ ++ while (len--) ++ fcs = gsm_fcs8[fcs ^ *c++]; ++ return fcs; ++} ++ ++/** ++ * gsm_read_ea - read a byte into an EA ++ * @val: variable holding value ++ * c: byte going into the EA ++ * ++ * Processes one byte of an EA. Updates the passed variable ++ * and returns 1 if the EA is now completely read ++ */ ++ ++static int gsm_read_ea(unsigned int *val, u8 c) ++{ ++ /* Add the next 7 bits into the value */ ++ *val <<= 7; ++ *val |= c >> 1; ++ /* Was this the last byte of the EA 1 = yes*/ ++ return c & EA; ++} ++ ++/** ++ * gsm_encode_modem - encode modem data bits ++ * @dlci: DLCI to encode from ++ * ++ * Returns the correct GSM encoded modem status bits (6 bit field) for ++ * the current status of the DLCI and attached tty object ++ */ ++ ++static u8 gsm_encode_modem(const struct gsm_dlci *dlci) ++{ ++ u8 modembits = 0; ++ /* FC is true flow control not modem bits */ ++ if (dlci->throttled) ++ modembits |= MDM_FC; ++ if (dlci->modem_tx & TIOCM_DTR) ++ modembits |= MDM_RTC; ++ if (dlci->modem_tx & TIOCM_RTS) ++ modembits |= MDM_RTR; ++ if (dlci->modem_tx & TIOCM_RI) ++ modembits |= MDM_IC; ++ if (dlci->modem_tx & TIOCM_CD) ++ modembits |= MDM_DV; ++ return modembits; ++} ++ ++/** ++ * gsm_print_packet - display a frame for debug ++ * @hdr: header to print before decode ++ * @addr: address EA from the frame ++ * @cr: C/R bit from the frame ++ * @control: control including PF bit ++ * @data: following data bytes ++ * @dlen: length of data ++ * ++ * Displays a packet in human readable format for debugging purposes. The ++ * style is based on amateur radio LAP-B dump display. ++ */ ++ ++static void gsm_print_packet(const char *hdr, int addr, int cr, ++ u8 control, const u8 *data, int dlen) ++{ ++ if (!(debug & 1)) ++ return; ++ ++ printk(KERN_INFO "%s %d) %c: ", hdr, addr, "RC"[cr]); ++ ++ switch (control & ~PF) { ++ case SABM: ++ printk(KERN_CONT "SABM"); ++ break; ++ case UA: ++ printk(KERN_CONT "UA"); ++ break; ++ case DISC: ++ printk(KERN_CONT "DISC"); ++ break; ++ case DM: ++ printk(KERN_CONT "DM"); ++ break; ++ case UI: ++ printk(KERN_CONT "UI"); ++ break; ++ case UIH: ++ printk(KERN_CONT "UIH"); ++ break; ++ default: ++ if (!(control & 0x01)) { ++ printk(KERN_CONT "I N(S)%d N(R)%d", ++ (control & 0x0E) >> 1, (control & 0xE)>> 5); ++ } else switch (control & 0x0F) { ++ case RR: ++ printk("RR(%d)", (control & 0xE0) >> 5); ++ break; ++ case RNR: ++ printk("RNR(%d)", (control & 0xE0) >> 5); ++ break; ++ case REJ: ++ printk("REJ(%d)", (control & 0xE0) >> 5); ++ break; ++ default: ++ printk(KERN_CONT "[%02X]", control); ++ } ++ } ++ ++ if (control & PF) ++ printk(KERN_CONT "(P)"); ++ else ++ printk(KERN_CONT "(F)"); ++ ++ if (dlen) { ++ int ct = 0; ++ while (dlen--) { ++ if (ct % 8 == 0) ++ printk(KERN_CONT "\n "); ++ printk(KERN_CONT "%02X ", *data++); ++ ct++; ++ } ++ } ++ printk(KERN_CONT "\n"); ++} ++ ++ ++/* ++ * Link level transmission side ++ */ ++ ++/** ++ * gsm_stuff_packet - bytestuff a packet ++ * @ibuf: input ++ * @obuf: output ++ * @len: length of input ++ * ++ * Expand a buffer by bytestuffing it. The worst case size change ++ * is doubling and the caller is responsible for handing out ++ * suitable sized buffers. ++ */ ++ ++static int gsm_stuff_frame(const u8 *input, u8 *output, int len) ++{ ++ int olen = 0; ++ while (len--) { ++ if (*input == GSM1_SOF || *input == GSM1_ESCAPE ++ || *input == XON || *input == XOFF) { ++ *output++ = GSM1_ESCAPE; ++ *output++ = *input++ ^ GSM1_ESCAPE_BITS; ++ olen++; ++ } else ++ *output++ = *input++; ++ olen++; ++ } ++ return olen; ++} ++ ++static void hex_packet(const unsigned char *p, int len) ++{ ++ int i; ++ for (i = 0; i < len; i++) { ++ if (i && (i % 16) == 0) ++ printk("\n"); ++ printk("%02X ", *p++); ++ } ++ printk("\n"); ++} ++ ++/** ++ * gsm_send - send a control frame ++ * @gsm: our GSM mux ++ * @addr: address for control frame ++ * @cr: command/response bit ++ * @control: control byte including PF bit ++ * ++ * Format up and transmit a control frame. These do not go via the ++ * queueing logic as they should be transmitted ahead of data when ++ * they are needed. ++ * ++ * FIXME: Lock versus data TX path ++ */ ++ ++static void gsm_send(struct gsm_mux *gsm, int addr, int cr, int control) ++{ ++ int len; ++ u8 cbuf[10]; ++ u8 ibuf[3]; ++ ++ switch (gsm->encoding) { ++ case 0: ++ cbuf[0] = GSM0_SOF; ++ cbuf[1] = (addr << 2) | (cr << 1) | EA; ++ cbuf[2] = control; ++ cbuf[3] = EA; /* Length of data = 0 */ ++ cbuf[4] = 0xFF - gsm_fcs_add_block(INIT_FCS, cbuf + 1, 3); ++ cbuf[5] = GSM0_SOF; ++ len = 6; ++ break; ++ case 1: ++ case 2: ++ /* Control frame + packing (but not frame stuffing) in mode 1 */ ++ ibuf[0] = (addr << 2) | (cr << 1) | EA; ++ ibuf[1] = control; ++ ibuf[2] = 0xFF - gsm_fcs_add_block(INIT_FCS, ibuf, 2); ++ /* Stuffing may double the size worst case */ ++ len = gsm_stuff_frame(ibuf, cbuf + 1, 3); ++ /* Now add the SOF markers */ ++ cbuf[0] = GSM1_SOF; ++ cbuf[len + 1] = GSM1_SOF; ++ /* FIXME: we can omit the lead one in many cases */ ++ len += 2; ++ break; ++ default: ++ WARN_ON(1); ++ return; ++ } ++ gsm->output(gsm, cbuf, len); ++ gsm_print_packet("-->", addr, cr, control, NULL, 0); ++} ++ ++/** ++ * gsm_response - send a control response ++ * @gsm: our GSM mux ++ * @addr: address for control frame ++ * @control: control byte including PF bit ++ * ++ * Format up and transmit a link level response frame. ++ */ ++ ++static inline void gsm_response(struct gsm_mux *gsm, int addr, int control) ++{ ++ gsm_send(gsm, addr, 0, control); ++} ++ ++/** ++ * gsm_command - send a control command ++ * @gsm: our GSM mux ++ * @addr: address for control frame ++ * @control: control byte including PF bit ++ * ++ * Format up and transmit a link level command frame. ++ */ ++ ++static inline void gsm_command(struct gsm_mux *gsm, int addr, int control) ++{ ++ gsm_send(gsm, addr, 1, control); ++} ++ ++/* Data transmission */ ++ ++#define HDR_LEN 6 /* ADDR CTRL [LEN.2] DATA FCS */ ++ ++/** ++ * gsm_data_alloc - allocate data frame ++ * @gsm: GSM mux ++ * @addr: DLCI address ++ * @len: length excluding header and FCS ++ * @ctrl: control byte ++ * ++ * Allocate a new data buffer for sending frames with data. Space is left ++ * at the front for header bytes but that is treated as an implementation ++ * detail and not for the high level code to use ++ */ ++ ++static struct gsm_msg *gsm_data_alloc(struct gsm_mux *gsm, u8 addr, int len, ++ u8 ctrl) ++{ ++ struct gsm_msg *m = kmalloc(sizeof(struct gsm_msg) + len + HDR_LEN, ++ GFP_ATOMIC); ++ if (m == NULL) ++ return NULL; ++ m->data = m->buffer + HDR_LEN - 1; /* Allow for FCS */ ++ m->len = len; ++ m->addr = addr; ++ m->ctrl = ctrl; ++ m->next = NULL; ++ return m; ++} ++ ++/** ++ * gsm_data_kick - poke the queue ++ * @gsm: GSM Mux ++ * ++ * The tty device has called us to indicate that room has appeared in ++ * the transmit queue. Ram more data into the pipe if we have any ++ * ++ * FIXME: lock against link layer control transmissions ++ */ ++ ++static void gsm_data_kick(struct gsm_mux *gsm) ++{ ++ struct gsm_msg *msg = gsm->tx_head; ++ int len; ++ int skip_sof = 0; ++ ++ /* FIXME: We need to apply this solely to data messages */ ++ if (gsm->constipated) ++ return; ++ ++ while (gsm->tx_head != NULL) { ++ msg = gsm->tx_head; ++ if (gsm->encoding != 0) { ++ gsm->txframe[0] = GSM1_SOF; ++ len = gsm_stuff_frame(msg->data, ++ gsm->txframe + 1, msg->len); ++ gsm->txframe[len + 1] = GSM1_SOF; ++ len += 2; ++ } else { ++ gsm->txframe[0] = GSM0_SOF; ++ memcpy(gsm->txframe + 1 , msg->data, msg->len); ++ gsm->txframe[msg->len + 1] = GSM0_SOF; ++ len = msg->len + 2; ++ } ++ ++ if (debug & 4) { ++ printk("gsm_data_kick: \n"); ++ hex_packet(gsm->txframe, len); ++ } ++ ++ if (gsm->output(gsm, gsm->txframe + skip_sof, ++ len - skip_sof) < 0) ++ break; ++ /* FIXME: Can eliminate one SOF in many more cases */ ++ gsm->tx_head = msg->next; ++ if (gsm->tx_head == NULL) ++ gsm->tx_tail = NULL; ++ gsm->tx_bytes -= msg->len; ++ kfree(msg); ++ /* For a burst of frames skip the extra SOF within the ++ burst */ ++ skip_sof = 1; ++ } ++} ++ ++/** ++ * __gsm_data_queue - queue a UI or UIH frame ++ * @dlci: DLCI sending the data ++ * @msg: message queued ++ * ++ * Add data to the transmit queue and try and get stuff moving ++ * out of the mux tty if not already doing so. The Caller must hold ++ * the gsm tx lock. ++ */ ++ ++static void __gsm_data_queue(struct gsm_dlci *dlci, struct gsm_msg *msg) ++{ ++ struct gsm_mux *gsm = dlci->gsm; ++ u8 *dp = msg->data; ++ u8 *fcs = dp + msg->len; ++ ++ /* Fill in the header */ ++ if (gsm->encoding == 0) { ++ if (msg->len < 128) ++ *--dp = (msg->len << 1) | EA; ++ else { ++ *--dp = (msg->len >> 6) | EA; ++ *--dp = (msg->len & 127) << 1; ++ } ++ } ++ ++ *--dp = msg->ctrl; ++ if (gsm->initiator) ++ *--dp = (msg->addr << 2) | 2 | EA; ++ else ++ *--dp = (msg->addr << 2) | EA; ++ *fcs = gsm_fcs_add_block(INIT_FCS, dp , msg->data - dp); ++ /* Ugly protocol layering violation */ ++ if (msg->ctrl == UI || msg->ctrl == (UI|PF)) ++ *fcs = gsm_fcs_add_block(*fcs, msg->data, msg->len); ++ *fcs = 0xFF - *fcs; ++ ++ gsm_print_packet("Q> ", msg->addr, gsm->initiator, msg->ctrl, ++ msg->data, msg->len); ++ ++ /* Move the header back and adjust the length, also allow for the FCS ++ now tacked on the end */ ++ msg->len += (msg->data - dp) + 1; ++ msg->data = dp; ++ ++ /* Add to the actual output queue */ ++ if (gsm->tx_tail) ++ gsm->tx_tail->next = msg; ++ else ++ gsm->tx_head = msg; ++ gsm->tx_tail = msg; ++ gsm->tx_bytes += msg->len; ++ gsm_data_kick(gsm); ++} ++ ++/** ++ * gsm_data_queue - queue a UI or UIH frame ++ * @dlci: DLCI sending the data ++ * @msg: message queued ++ * ++ * Add data to the transmit queue and try and get stuff moving ++ * out of the mux tty if not already doing so. Take the ++ * the gsm tx lock and dlci lock. ++ */ ++ ++static void gsm_data_queue(struct gsm_dlci *dlci, struct gsm_msg *msg) ++{ ++ unsigned long flags; ++ spin_lock_irqsave(&dlci->gsm->tx_lock, flags); ++ __gsm_data_queue(dlci, msg); ++ spin_unlock_irqrestore(&dlci->gsm->tx_lock, flags); ++} ++ ++/** ++ * gsm_dlci_data_output - try and push data out of a DLCI ++ * @gsm: mux ++ * @dlci: the DLCI to pull data from ++ * ++ * Pull data from a DLCI and send it into the transmit queue if there ++ * is data. Keep to the MRU of the mux. This path handles the usual tty ++ * interface which is a byte stream with optional modem data. ++ * ++ * Caller must hold the tx_lock of the mux. ++ */ ++ ++static int gsm_dlci_data_output(struct gsm_mux *gsm, struct gsm_dlci *dlci) ++{ ++ struct gsm_msg *msg; ++ u8 *dp; ++ int len, size; ++ int h = dlci->adaption - 1; ++ ++ len = kfifo_len(dlci->fifo); ++ if (len == 0) ++ return 0; ++ ++ /* MTU/MRU count only the data bits */ ++ if (len > gsm->mtu) ++ len = gsm->mtu; ++ ++ size = len + h; ++ ++ msg = gsm_data_alloc(gsm, dlci->addr, size, gsm->ftype); ++ /* FIXME: need a timer or something to kick this so it can't ++ get stuck with no work outstanding and no buffer free */ ++ if (msg == NULL) ++ return -ENOMEM; ++ dp = msg->data; ++ switch (dlci->adaption) { ++ case 1: /* Unstructured */ ++ break; ++ case 2: /* Unstructed with modem bits. Always one byte as we never ++ send inline break data */ ++ *dp += gsm_encode_modem(dlci); ++ len--; ++ break; ++ } ++ WARN_ON(kfifo_out_locked(dlci->fifo, dp , len, &dlci->lock) != len); ++ __gsm_data_queue(dlci, msg); ++ /* Bytes of data we used up */ ++ return size; ++} ++ ++/** ++ * gsm_dlci_data_output_framed - try and push data out of a DLCI ++ * @gsm: mux ++ * @dlci: the DLCI to pull data from ++ * ++ * Pull data from a DLCI and send it into the transmit queue if there ++ * is data. Keep to the MRU of the mux. This path handles framed data ++ * queued as skbuffs to the DLCI. ++ * ++ * Caller must hold the tx_lock of the mux. ++ */ ++ ++static int gsm_dlci_data_output_framed(struct gsm_mux *gsm, ++ struct gsm_dlci *dlci) ++{ ++ struct gsm_msg *msg; ++ u8 *dp; ++ int len, size; ++ int last = 0, first = 0; ++ int overhead = 0; ++ ++ /* One byte per frame is used for B/F flags */ ++ if (dlci->adaption == 4) ++ overhead = 1; ++ ++ /* dlci->skb is locked by tx_lock */ ++ if (dlci->skb == NULL) { ++ dlci->skb = skb_dequeue(&dlci->skb_list); ++ if (dlci->skb == NULL) ++ return 0; ++ first = 1; ++ } ++ len = dlci->skb->len + overhead; ++ ++ /* MTU/MRU count only the data bits */ ++ if (len > gsm->mtu) { ++ if (dlci->adaption == 3) { ++ /* Over long frame, bin it */ ++ kfree_skb(dlci->skb); ++ dlci->skb = NULL; ++ return 0; ++ } ++ len = gsm->mtu; ++ } else ++ last = 1; ++ ++ size = len + overhead; ++ msg = gsm_data_alloc(gsm, dlci->addr, size, gsm->ftype); ++ ++ /* FIXME: need a timer or something to kick this so it can't ++ get stuck with no work outstanding and no buffer free */ ++ if (msg == NULL) ++ return -ENOMEM; ++ dp = msg->data; ++ ++ if (dlci->adaption == 4) { /* Interruptible framed (Packetised Data) */ ++ /* Flag byte to carry the start/end info */ ++ *dp++ = last << 7 | first << 6 | 1; /* EA */ ++ len--; ++ } ++ memcpy(dp, skb_pull(dlci->skb, len), len); ++ __gsm_data_queue(dlci, msg); ++ if (last) ++ dlci->skb = NULL; ++ return size; ++} ++ ++/** ++ * gsm_dlci_data_sweep - look for data to send ++ * @gsm: the GSM mux ++ * ++ * Sweep the GSM mux channels in priority order looking for ones with ++ * data to send. We could do with optimising this scan a bit. We aim ++ * to fill the queue totally or up to TX_THRESH_HI bytes. Once we hit ++ * TX_THRESH_LO we get called again ++ * ++ * FIXME: We should round robin between groups and in theory you can ++ * renegotiate DLCI priorities with optional stuff. Needs optimising. ++ */ ++ ++static void gsm_dlci_data_sweep(struct gsm_mux *gsm) ++{ ++ int len; ++ /* Priority ordering: We should do priority with RR of the groups */ ++ int i = 1; ++ unsigned long flags; ++ ++ spin_lock_irqsave(&gsm->tx_lock, flags); ++ while (i < NUM_DLCI) { ++ struct gsm_dlci *dlci; ++ ++ if (gsm->tx_bytes > TX_THRESH_HI) ++ break; ++ dlci = gsm->dlci[i]; ++ if (dlci == NULL || dlci->constipated) { ++ i++; ++ continue; ++ } ++ if (dlci->adaption < 3) ++ len = gsm_dlci_data_output(gsm, dlci); ++ else ++ len = gsm_dlci_data_output_framed(gsm, dlci); ++ if (len < 0) ++ return; ++ /* DLCI empty - try the next */ ++ if (len == 0) ++ i++; ++ } ++ spin_unlock_irqrestore(&gsm->tx_lock, flags); ++} ++ ++/** ++ * gsm_dlci_data_kick - transmit if possible ++ * @dlci: DLCI to kick ++ * ++ * Transmit data from this DLCI if the queue is empty. We can't rely on ++ * a tty wakeup except when we filled the pipe so we need to fire off ++ * new data ourselves in other cases. ++ */ ++ ++static void gsm_dlci_data_kick(struct gsm_dlci *dlci) ++{ ++ unsigned long flags; ++ ++ spin_lock_irqsave(&dlci->gsm->tx_lock, flags); ++ /* If we have nothing running then we need to fire up */ ++ if (dlci->gsm->tx_bytes == 0) ++ gsm_dlci_data_output(dlci->gsm, dlci); ++ else if (dlci->gsm->tx_bytes < TX_THRESH_LO) ++ gsm_dlci_data_sweep(dlci->gsm); ++ spin_unlock_irqrestore(&dlci->gsm->tx_lock, flags); ++} ++ ++/* ++ * Control message processing ++ */ ++ ++ ++/** ++ * gsm_control_reply - send a response frame to a control ++ * @gsm: gsm channel ++ * @cmd: the command to use ++ * @data: data to follow encoded info ++ * @dlen: length of data ++ * ++ * Encode up and queue a UI/UIH frame containing our response. ++ */ ++ ++static void gsm_control_reply(struct gsm_mux *gsm, int cmd, u8 *data, ++ int dlen) ++{ ++ struct gsm_msg *msg; ++ msg = gsm_data_alloc(gsm, 0, dlen + 2, gsm->ftype); ++ msg->data[0] = (cmd & 0xFE) << 1 | EA; /* Clear C/R */ ++ msg->data[1] = (dlen << 1) | EA; ++ memcpy(msg->data + 2, data, dlen); ++ gsm_data_queue(gsm->dlci[0], msg); ++} ++ ++/** ++ * gsm_process_modem - process received modem status ++ * @tty: virtual tty bound to the DLCI ++ * @dlci: DLCI to affect ++ * @modem: modem bits (full EA) ++ * ++ * Used when a modem control message or line state inline in adaption ++ * layer 2 is processed. Sort out the local modem state and throttles ++ */ ++ ++static void gsm_process_modem(struct tty_struct *tty, struct gsm_dlci *dlci, ++ u32 modem) ++{ ++ int mlines = 0; ++ u8 brk = modem >> 6; ++ ++ /* Flow control/ready to communicate */ ++ if (modem & MDM_FC) { ++ /* Need to throttle our output on this device */ ++ dlci->constipated = 1; ++ } ++ if (modem & MDM_RTC) { ++ mlines |= TIOCM_DSR | TIOCM_DTR; ++ dlci->constipated = 0; ++ gsm_dlci_data_kick(dlci); ++ } ++ /* Map modem bits */ ++ if (modem & MDM_RTR) ++ mlines |= TIOCM_RTS | TIOCM_CTS; ++ if (modem & MDM_IC) ++ mlines |= TIOCM_RI; ++ if (modem & MDM_DV) ++ mlines |= TIOCM_CD; ++ ++ /* Carrier drop -> hangup */ ++ if (tty) { ++ if ((mlines & TIOCM_CD) == 0 && (dlci->modem_rx & TIOCM_CD)) ++ if (!(tty->termios->c_cflag & CLOCAL)) ++ tty_hangup(tty); ++ if (brk & 0x01) ++ tty_insert_flip_char(tty, 0, TTY_BREAK); ++ } ++ dlci->modem_rx = mlines; ++} ++ ++/** ++ * gsm_control_modem - modem status received ++ * @gsm: GSM channel ++ * @data: data following command ++ * @clen: command length ++ * ++ * We have received a modem status control message. This is used by ++ * the GSM mux protocol to pass virtual modem line status and optionally ++ * to indicate break signals. Unpack it, convert to Linux representation ++ * and if need be stuff a break message down the tty. ++ */ ++ ++static void gsm_control_modem(struct gsm_mux *gsm, u8 *data, int clen) ++{ ++ unsigned int addr = 0; ++ unsigned int modem = 0; ++ struct gsm_dlci *dlci; ++ int len = clen; ++ u8 *dp = data; ++ struct tty_struct *tty; ++ ++ while (gsm_read_ea(&addr, *dp++) == 0) { ++ len--; ++ if (len == 0) ++ return; ++ } ++ /* Must be at least one byte following the EA */ ++ len--; ++ if (len <= 0) ++ return; ++ ++ addr >>= 1; ++ /* Closed port, or invalid ? */ ++ if (addr == 0 || addr >= NUM_DLCI || gsm->dlci[addr] == NULL) ++ return; ++ dlci = gsm->dlci[addr]; ++ ++ while (gsm_read_ea(&modem, *dp++) == 0) { ++ len--; ++ if (len == 0) ++ return; ++ } ++ tty = tty_port_tty_get(&dlci->port); ++ gsm_process_modem(tty, dlci, modem); ++ if (tty) { ++ tty_wakeup(tty); ++ tty_kref_put(tty); ++ } ++ gsm_control_reply(gsm, CMD_MSC, data, clen); ++} ++ ++/** ++ * gsm_control_rls - remote line status ++ * @gsm: GSM channel ++ * @data: data bytes ++ * @clen: data length ++ * ++ * The modem sends us a two byte message on the control channel whenever ++ * it wishes to send us an error state from the virtual link. Stuff ++ * this into the uplink tty if present ++ */ ++ ++static void gsm_control_rls(struct gsm_mux *gsm, u8 *data, int clen) ++{ ++ struct tty_struct *tty; ++ unsigned int addr = 0 ; ++ u8 bits; ++ int len = clen; ++ u8 *dp = data; ++ ++ while (gsm_read_ea(&addr, *dp++) == 0) { ++ len--; ++ if (len == 0) ++ return; ++ } ++ /* Must be at least one byte following ea */ ++ len--; ++ if (len <= 0) ++ return; ++ addr >>= 1; ++ /* Closed port, or invalid ? */ ++ if (addr == 0 || addr >= NUM_DLCI || gsm->dlci[addr] == NULL) ++ return; ++ /* No error ? */ ++ bits = *dp; ++ if ((bits & 1) == 0) ++ return; ++ /* See if we have an uplink tty */ ++ tty = tty_port_tty_get(&gsm->dlci[addr]->port); ++ ++ if (tty) { ++ if (bits & 2) ++ tty_insert_flip_char(tty, 0, TTY_OVERRUN); ++ if (bits & 4) ++ tty_insert_flip_char(tty, 0, TTY_PARITY); ++ if (bits & 8) ++ tty_insert_flip_char(tty, 0, TTY_FRAME); ++ tty_flip_buffer_push(tty); ++ tty_kref_put(tty); ++ } ++ gsm_control_reply(gsm, CMD_RLS, data, clen); ++} ++ ++static void gsm_dlci_begin_close(struct gsm_dlci *dlci); ++ ++/** ++ * gsm_control_message - DLCI 0 control processing ++ * @gsm: our GSM mux ++ * @command: the command EA ++ * @data: data beyond the command/length EAs ++ * @clen: length ++ * ++ * Input processor for control messages from the other end of the link. ++ * Processes the incoming request and queues a response frame or an ++ * NSC response if not supported ++ */ ++ ++static void gsm_control_message(struct gsm_mux *gsm, unsigned int command, ++ u8 *data, int clen) ++{ ++ u8 buf[1]; ++ switch (command) { ++ case CMD_CLD: { ++ struct gsm_dlci *dlci = gsm->dlci[0]; ++ /* Modem wishes to close down */ ++ if (dlci) { ++ dlci->dead = 1; ++ gsm->dead = 1; ++ gsm_dlci_begin_close(dlci); ++ } ++ } ++ break; ++ case CMD_TEST: ++ /* Modem wishes to test, reply with the data */ ++ gsm_control_reply(gsm, CMD_TEST, data, clen); ++ break; ++ case CMD_FCON: ++ /* Modem wants us to STFU */ ++ gsm->constipated = 1; ++ gsm_control_reply(gsm, CMD_FCON, NULL, 0); ++ break; ++ case CMD_FCOFF: ++ /* Modem can accept data again */ ++ gsm->constipated = 0; ++ gsm_control_reply(gsm, CMD_FCOFF, NULL, 0); ++ /* Kick the link in case it is idling */ ++ gsm_data_kick(gsm); ++ break; ++ case CMD_MSC: ++ /* Out of band modem line change indicator for a DLCI */ ++ gsm_control_modem(gsm, data, clen); ++ break; ++ case CMD_RLS: ++ /* Out of band error reception for a DLCI */ ++ gsm_control_rls(gsm, data, clen); ++ break; ++ case CMD_PSC: ++ /* Modem wishes to enter power saving state */ ++ gsm_control_reply(gsm, CMD_PSC, NULL, 0); ++ break; ++ /* Optional unsupported commands */ ++ case CMD_PN: /* Parameter negotiation */ ++ case CMD_RPN: /* Remote port negotation */ ++ case CMD_SNC: /* Service negotation command */ ++ default: ++ /* Reply to bad commands with an NSC */ ++ buf[0] = command; ++ gsm_control_reply(gsm, CMD_NSC, buf, 1); ++ break; ++ } ++} ++ ++/** ++ * gsm_control_response - process a response to our control ++ * @gsm: our GSM mux ++ * @command: the command (response) EA ++ * @data: data beyond the command/length EA ++ * @clen: length ++ * ++ * Process a response to an outstanding command. We only allow a single ++ * control message in flight so this is fairly easy. All the clean up ++ * is done by the caller, we just update the fields, flag it as done ++ * and return ++ */ ++ ++static void gsm_control_response(struct gsm_mux *gsm, unsigned int command, ++ u8 *data, int clen) ++{ ++ struct gsm_control *ctrl; ++ unsigned long flags; ++ ++ spin_lock_irqsave(&gsm->control_lock, flags); ++ ++ ctrl = gsm->pending_cmd; ++ /* Does the reply match our command */ ++ command |= 1; ++ if (ctrl != NULL && (command == ctrl->cmd || command == CMD_NSC)) { ++ /* Our command was replied to, kill the retry timer */ ++ del_timer(&gsm->t2_timer); ++ gsm->pending_cmd = NULL; ++ /* Rejected by the other end */ ++ if (command == CMD_NSC) ++ ctrl->error = -EOPNOTSUPP; ++ ctrl->done = 1; ++ wake_up(&gsm->event); ++ } ++ spin_unlock_irqrestore(&gsm->control_lock, flags); ++} ++ ++/** ++ * gsm_control_transmit - send control packet ++ * @gsm: gsm mux ++ * @ctrl: frame to send ++ * ++ * Send out a pending control command (called under control lock) ++ */ ++ ++static void gsm_control_transmit(struct gsm_mux *gsm, struct gsm_control *ctrl) ++{ ++ struct gsm_msg *msg = gsm_data_alloc(gsm, 0, ctrl->len + 1, ++ gsm->ftype|PF); ++ if (msg == NULL) ++ return; ++ msg->data[0] = (ctrl->cmd << 1) | 2 | EA; /* command */ ++ memcpy(msg->data + 1, ctrl->data, ctrl->len); ++ gsm_data_queue(gsm->dlci[0], msg); ++} ++ ++/** ++ * gsm_control_retransmit - retransmit a control frame ++ * @data: pointer to our gsm object ++ * ++ * Called off the T2 timer expiry in order to retransmit control frames ++ * that have been lost in the system somewhere. The control_lock protects ++ * us from colliding with another sender or a receive completion event. ++ * In that situation the timer may still occur in a small window but ++ * gsm->pending_cmd will be NULL and we just let the timer expire. ++ */ ++ ++static void gsm_control_retransmit(unsigned long data) ++{ ++ struct gsm_mux *gsm = (struct gsm_mux *)data; ++ struct gsm_control *ctrl; ++ unsigned long flags; ++ spin_lock_irqsave(&gsm->control_lock, flags); ++ ctrl = gsm->pending_cmd; ++ if (ctrl) { ++ gsm->cretries--; ++ if (gsm->cretries == 0) { ++ gsm->pending_cmd = NULL; ++ ctrl->error = -ETIMEDOUT; ++ ctrl->done = 1; ++ spin_unlock_irqrestore(&gsm->control_lock, flags); ++ wake_up(&gsm->event); ++ return; ++ } ++ gsm_control_transmit(gsm, ctrl); ++ mod_timer(&gsm->t2_timer, jiffies + gsm->t2 * HZ / 100); ++ } ++ spin_unlock_irqrestore(&gsm->control_lock, flags); ++} ++ ++/** ++ * gsm_control_send - send a control frame on DLCI 0 ++ * @gsm: the GSM channel ++ * @command: command to send including CR bit ++ * @data: bytes of data (must be kmalloced) ++ * @len: length of the block to send ++ * ++ * Queue and dispatch a control command. Only one command can be ++ * active at a time. In theory more can be outstanding but the matching ++ * gets really complicated so for now stick to one outstanding. ++ */ ++ ++static struct gsm_control *gsm_control_send(struct gsm_mux *gsm, ++ unsigned int command, u8 *data, int clen) ++{ ++ struct gsm_control *ctrl = kzalloc(sizeof(struct gsm_control), ++ GFP_KERNEL); ++ unsigned long flags; ++ if (ctrl == NULL) ++ return NULL; ++retry: ++ wait_event(gsm->event, gsm->pending_cmd == NULL); ++ spin_lock_irqsave(&gsm->control_lock, flags); ++ if (gsm->pending_cmd != NULL) { ++ spin_unlock_irqrestore(&gsm->control_lock, flags); ++ goto retry; ++ } ++ ctrl->cmd = command; ++ ctrl->data = data; ++ ctrl->len = clen; ++ gsm->pending_cmd = ctrl; ++ gsm->cretries = gsm->n2; ++ mod_timer(&gsm->t2_timer, jiffies + gsm->t2 * HZ / 100); ++ gsm_control_transmit(gsm, ctrl); ++ spin_unlock_irqrestore(&gsm->control_lock, flags); ++ return ctrl; ++} ++ ++/** ++ * gsm_control_wait - wait for a control to finish ++ * @gsm: GSM mux ++ * @control: control we are waiting on ++ * ++ * Waits for the control to complete or time out. Frees any used ++ * resources and returns 0 for success, or an error if the remote ++ * rejected or ignored the request. ++ */ ++ ++static int gsm_control_wait(struct gsm_mux *gsm, struct gsm_control *control) ++{ ++ int err; ++ wait_event(gsm->event, control->done == 1); ++ err = control->error; ++ kfree(control); ++ return err; ++} ++ ++ ++/* ++ * DLCI level handling: Needs krefs ++ */ ++ ++/* ++ * State transitions and timers ++ */ ++ ++/** ++ * gsm_dlci_close - a DLCI has closed ++ * @dlci: DLCI that closed ++ * ++ * Perform processing when moving a DLCI into closed state. If there ++ * is an attached tty this is hung up ++ */ ++ ++static void gsm_dlci_close(struct gsm_dlci *dlci) ++{ ++ del_timer(&dlci->t1); ++ if (debug & 8) ++ printk("DLCI %d goes closed.\n", dlci->addr); ++ dlci->state = DLCI_CLOSED; ++ if (dlci->addr != 0) { ++ struct tty_struct *tty = tty_port_tty_get(&dlci->port); ++ if (tty) { ++ tty_hangup(tty); ++ tty_kref_put(tty); ++ } ++ kfifo_reset(dlci->fifo); ++ } else ++ dlci->gsm->dead = 1; ++ wake_up(&dlci->gsm->event); ++ /* A DLCI 0 close is a MUX termination so we need to kick that ++ back to userspace somehow */ ++} ++ ++/** ++ * gsm_dlci_open - a DLCI has opened ++ * @dlci: DLCI that opened ++ * ++ * Perform processing when moving a DLCI into open state. ++ */ ++ ++static void gsm_dlci_open(struct gsm_dlci *dlci) ++{ ++ /* Note that SABM UA .. SABM UA first UA lost can mean that we go ++ open -> open */ ++ del_timer(&dlci->t1); ++ /* This will let a tty open continue */ ++ dlci->state = DLCI_OPEN; ++ if (debug & 8) ++ printk("DLCI %d goes open.\n", dlci->addr); ++ wake_up(&dlci->gsm->event); ++} ++ ++/** ++ * gsm_dlci_t1 - T1 timer expiry ++ * @dlci: DLCI that opened ++ * ++ * The T1 timer handles retransmits of control frames (essentially of ++ * SABM and DISC). We resend the command until the retry count runs out ++ * in which case an opening port goes back to closed and a closing port ++ * is simply put into closed state (any further frames from the other ++ * end will get a DM response) ++ */ ++ ++static void gsm_dlci_t1(unsigned long data) ++{ ++ struct gsm_dlci *dlci = (struct gsm_dlci *)data; ++ struct gsm_mux *gsm = dlci->gsm; ++ ++ switch (dlci->state) { ++ case DLCI_OPENING: ++ dlci->retries--; ++ if (dlci->retries) { ++ gsm_command(dlci->gsm, dlci->addr, SABM|PF); ++ mod_timer(&dlci->t1, jiffies + gsm->t1 * HZ / 100); ++ } else ++ gsm_dlci_close(dlci); ++ break; ++ case DLCI_CLOSING: ++ dlci->retries--; ++ if (dlci->retries) { ++ gsm_command(dlci->gsm, dlci->addr, DISC|PF); ++ mod_timer(&dlci->t1, jiffies + gsm->t1 * HZ / 100); ++ } else ++ gsm_dlci_close(dlci); ++ break; ++ } ++} ++ ++/** ++ * gsm_dlci_begin_open - start channel open procedure ++ * @dlci: DLCI to open ++ * ++ * Commence opening a DLCI from the Linux side. We issue SABM messages ++ * to the modem which should then reply with a UA, at which point we ++ * will move into open state. Opening is done asynchronously with retry ++ * running off timers and the responses. ++ */ ++ ++static void gsm_dlci_begin_open(struct gsm_dlci *dlci) ++{ ++ struct gsm_mux *gsm = dlci->gsm; ++ if (dlci->state == DLCI_OPEN || dlci->state == DLCI_OPENING) ++ return; ++ dlci->retries = gsm->n2; ++ dlci->state = DLCI_OPENING; ++ gsm_command(dlci->gsm, dlci->addr, SABM|PF); ++ mod_timer(&dlci->t1, jiffies + gsm->t1 * HZ / 100); ++} ++ ++/** ++ * gsm_dlci_begin_close - start channel open procedure ++ * @dlci: DLCI to open ++ * ++ * Commence closing a DLCI from the Linux side. We issue DISC messages ++ * to the modem which should then reply with a UA, at which point we ++ * will move into closed state. Closing is done asynchronously with retry ++ * off timers. We may also receive a DM reply from the other end which ++ * indicates the channel was already closed. ++ */ ++ ++static void gsm_dlci_begin_close(struct gsm_dlci *dlci) ++{ ++ struct gsm_mux *gsm = dlci->gsm; ++ if (dlci->state == DLCI_CLOSED || dlci->state == DLCI_CLOSING) ++ return; ++ dlci->retries = gsm->n2; ++ dlci->state = DLCI_CLOSING; ++ gsm_command(dlci->gsm, dlci->addr, DISC|PF); ++ mod_timer(&dlci->t1, jiffies + gsm->t1 * HZ / 100); ++} ++ ++/** ++ * gsm_dlci_data - data arrived ++ * @dlci: channel ++ * @data: block of bytes received ++ * @len: length of received block ++ * ++ * A UI or UIH frame has arrived which contains data for a channel ++ * other than the control channel. If the relevant virtual tty is ++ * open we shovel the bits down it, if not we drop them. ++ */ ++ ++static void gsm_dlci_data(struct gsm_dlci *dlci, u8 *data, int len) ++{ ++ /* krefs .. */ ++ struct tty_port *port = &dlci->port; ++ struct tty_struct *tty = tty_port_tty_get(port); ++ unsigned int modem = 0; ++ ++ if (debug & 16) ++ printk("%d bytes for tty %p\n", len, tty); ++ if (tty) { ++ switch (dlci->adaption) { ++ /* Unsupported types */ ++ /* Packetised interruptible data */ ++ case 4: ++ break; ++ /* Packetised uininterruptible voice/data */ ++ case 3: ++ break; ++ /* Asynchronous serial with line state in each frame */ ++ case 2: ++ while (gsm_read_ea(&modem, *data++) == 0) { ++ len--; ++ if (len == 0) ++ return; ++ } ++ gsm_process_modem(tty, dlci, modem); ++ /* Line state will go via DLCI 0 controls only */ ++ case 1: ++ default: ++ tty_insert_flip_string(tty, data, len); ++ tty_flip_buffer_push(tty); ++ } ++ tty_kref_put(tty); ++ } ++} ++ ++/** ++ * gsm_dlci_control - data arrived on control channel ++ * @dlci: channel ++ * @data: block of bytes received ++ * @len: length of received block ++ * ++ * A UI or UIH frame has arrived which contains data for DLCI 0 the ++ * control channel. This should contain a command EA followed by ++ * control data bytes. The command EA contains a command/response bit ++ * and we divide up the work accordingly. ++ */ ++ ++static void gsm_dlci_command(struct gsm_dlci *dlci, u8 *data, int len) ++{ ++ /* See what command is involved */ ++ unsigned int command = 0; ++ while (len-- > 0) { ++ if (gsm_read_ea(&command, *data++) == 1) { ++ int clen = *data++; ++ len--; ++ /* FIXME: this is properly an EA */ ++ clen >>= 1; ++ /* Malformed command ? */ ++ if (clen > len) ++ return; ++ if (command & 1) ++ gsm_control_message(dlci->gsm, command, ++ data, clen); ++ else ++ gsm_control_response(dlci->gsm, command, ++ data, clen); ++ return; ++ } ++ } ++} ++ ++/* ++ * Allocate/Free DLCI channels ++ */ ++ ++/** ++ * gsm_dlci_alloc - allocate a DLCI ++ * @gsm: GSM mux ++ * @addr: address of the DLCI ++ * ++ * Allocate and install a new DLCI object into the GSM mux. ++ * ++ * FIXME: review locking races ++ */ ++ ++static struct gsm_dlci *gsm_dlci_alloc(struct gsm_mux *gsm, int addr) ++{ ++ struct gsm_dlci *dlci = kzalloc(sizeof(struct gsm_dlci), GFP_ATOMIC); ++ if (dlci == NULL) ++ return NULL; ++ spin_lock_init(&dlci->lock); ++ dlci->fifo = &dlci->_fifo; ++ if (kfifo_alloc(&dlci->_fifo, 4096, GFP_KERNEL) < 0) { ++ kfree(dlci); ++ return NULL; ++ } ++ ++ skb_queue_head_init(&dlci->skb_list); ++ init_timer(&dlci->t1); ++ dlci->t1.function = gsm_dlci_t1; ++ dlci->t1.data = (unsigned long)dlci; ++ tty_port_init(&dlci->port); ++ dlci->port.ops = &gsm_port_ops; ++ dlci->gsm = gsm; ++ dlci->addr = addr; ++ dlci->adaption = gsm->adaption; ++ dlci->state = DLCI_CLOSED; ++ if (addr) ++ dlci->data = gsm_dlci_data; ++ else ++ dlci->data = gsm_dlci_command; ++ gsm->dlci[addr] = dlci; ++ return dlci; ++} ++ ++/** ++ * gsm_dlci_free - release DLCI ++ * @dlci: DLCI to destroy ++ * ++ * Free up a DLCI. Currently to keep the lifetime rules sane we only ++ * clean up DLCI objects when the MUX closes rather than as the port ++ * is closed down on both the tty and mux levels. ++ * ++ * Can sleep. ++ */ ++static void gsm_dlci_free(struct gsm_dlci *dlci) ++{ ++ struct tty_struct *tty = tty_port_tty_get(&dlci->port); ++ if (tty) { ++ tty_vhangup(tty); ++ tty_kref_put(tty); ++ } ++ del_timer_sync(&dlci->t1); ++ dlci->gsm->dlci[dlci->addr] = NULL; ++ kfifo_free(dlci->fifo); ++ kfree(dlci); ++} ++ ++ ++/* ++ * LAPBish link layer logic ++ */ ++ ++/** ++ * gsm_queue - a GSM frame is ready to process ++ * @gsm: pointer to our gsm mux ++ * ++ * At this point in time a frame has arrived and been demangled from ++ * the line encoding. All the differences between the encodings have ++ * been handled below us and the frame is unpacked into the structures. ++ * The fcs holds the header FCS but any data FCS must be added here. ++ */ ++ ++static void gsm_queue(struct gsm_mux *gsm) ++{ ++ struct gsm_dlci *dlci; ++ u8 cr; ++ int address; ++ /* We have to sneak a look at the packet body to do the FCS. ++ A somewhat layering violation in the spec */ ++ ++ if ((gsm->control & ~PF) == UI) ++ gsm->fcs = gsm_fcs_add_block(gsm->fcs, gsm->buf, gsm->len); ++ if (gsm->fcs != GOOD_FCS) { ++ gsm->bad_fcs++; ++ if (debug & 4) ++ printk("BAD FCS %02x\n", gsm->fcs); ++ return; ++ } ++ address = gsm->address >> 1; ++ if (address >= NUM_DLCI) ++ goto invalid; ++ ++ cr = gsm->address & 1; /* C/R bit */ ++ ++ gsm_print_packet("<--", address, cr, gsm->control, gsm->buf, gsm->len); ++ ++ cr ^= 1 - gsm->initiator; /* Flip so 1 always means command */ ++ dlci = gsm->dlci[address]; ++ ++ switch (gsm->control) { ++ case SABM|PF: ++ if (cr == 0) ++ goto invalid; ++ if (dlci == NULL) ++ dlci = gsm_dlci_alloc(gsm, address); ++ if (dlci == NULL) ++ return; ++ if (dlci->dead) ++ gsm_response(gsm, address, DM); ++ else { ++ gsm_response(gsm, address, UA); ++ gsm_dlci_open(dlci); ++ } ++ break; ++ case DISC|PF: ++ if (cr == 0) ++ goto invalid; ++ if (dlci == NULL || dlci->state == DLCI_CLOSED) { ++ gsm_response(gsm, address, DM); ++ return; ++ } ++ /* Real close complete */ ++ gsm_response(gsm, address, UA); ++ gsm_dlci_close(dlci); ++ break; ++ case UA: ++ case UA|PF: ++ if (cr == 0 || dlci == NULL) ++ break; ++ switch (dlci->state) { ++ case DLCI_CLOSING: ++ gsm_dlci_close(dlci); ++ break; ++ case DLCI_OPENING: ++ gsm_dlci_open(dlci); ++ break; ++ } ++ break; ++ case DM: /* DM can be valid unsolicited */ ++ case DM|PF: ++ if (cr) ++ goto invalid; ++ if (dlci == NULL) ++ return; ++ gsm_dlci_close(dlci); ++ break; ++ case UI: ++ case UI|PF: ++ case UIH: ++ case UIH|PF: ++#if 0 ++ if (cr) ++ goto invalid; ++#endif ++ if (dlci == NULL || dlci->state != DLCI_OPEN) { ++ gsm_command(gsm, address, DM|PF); ++ return; ++ } ++ dlci->data(dlci, gsm->buf, gsm->len); ++ break; ++ default: ++ goto invalid; ++ } ++ return; ++invalid: ++ gsm->malformed++; ++ return; ++} ++ ++ ++/** ++ * gsm0_receive - perform processing for non-transparency ++ * @gsm: gsm data for this ldisc instance ++ * @c: character ++ * ++ * Receive bytes in gsm mode 0 ++ */ ++ ++static void gsm0_receive(struct gsm_mux *gsm, unsigned char c) ++{ ++ switch (gsm->state) { ++ case GSM_SEARCH: /* SOF marker */ ++ if (c == GSM0_SOF) { ++ gsm->state = GSM_ADDRESS; ++ gsm->address = 0; ++ gsm->len = 0; ++ gsm->fcs = INIT_FCS; ++ } ++ break; /* Address EA */ ++ case GSM_ADDRESS: ++ gsm->fcs = gsm_fcs_add(gsm->fcs, c); ++ if (gsm_read_ea(&gsm->address, c)) ++ gsm->state = GSM_CONTROL; ++ break; ++ case GSM_CONTROL: /* Control Byte */ ++ gsm->fcs = gsm_fcs_add(gsm->fcs, c); ++ gsm->control = c; ++ gsm->state = GSM_LEN; ++ break; ++ case GSM_LEN: /* Length EA */ ++ gsm->fcs = gsm_fcs_add(gsm->fcs, c); ++ if (gsm_read_ea(&gsm->len, c)) { ++ if (gsm->len > gsm->mru) { ++ gsm->bad_size++; ++ gsm->state = GSM_SEARCH; ++ break; ++ } ++ gsm->count = 0; ++ gsm->state = GSM_DATA; ++ } ++ break; ++ case GSM_DATA: /* Data */ ++ gsm->buf[gsm->count++] = c; ++ if (gsm->count == gsm->len) ++ gsm->state = GSM_FCS; ++ break; ++ case GSM_FCS: /* FCS follows the packet */ ++ gsm->fcs = c; ++ gsm_queue(gsm); ++ /* And then back for the next frame */ ++ gsm->state = GSM_SEARCH; ++ break; ++ } ++} ++ ++/** ++ * gsm0_receive - perform processing for non-transparency ++ * @gsm: gsm data for this ldisc instance ++ * @c: character ++ * ++ * Receive bytes in mode 1 (Advanced option) ++ */ ++ ++static void gsm1_receive(struct gsm_mux *gsm, unsigned char c) ++{ ++ if (c == GSM1_SOF) { ++ /* EOF is only valid in frame if we have got to the data state ++ and received at least one byte (the FCS) */ ++ if (gsm->state == GSM_DATA && gsm->count) { ++ /* Extract the FCS */ ++ gsm->count--; ++ gsm->fcs = gsm_fcs_add(gsm->fcs, gsm->buf[gsm->count]); ++ gsm->len = gsm->count; ++ gsm_queue(gsm); ++ gsm->state = GSM_START; ++ return; ++ } ++ /* Any partial frame was a runt so go back to start */ ++ if (gsm->state != GSM_START) { ++ gsm->malformed++; ++ gsm->state = GSM_START; ++ } ++ /* A SOF in GSM_START means we are still reading idling or ++ framing bytes */ ++ return; ++ } ++ ++ if (c == GSM1_ESCAPE) { ++ gsm->escape = 1; ++ return; ++ } ++ ++ /* Only an unescaped SOF gets us out of GSM search */ ++ if (gsm->state == GSM_SEARCH) ++ return; ++ ++ if (gsm->escape) { ++ c ^= GSM1_ESCAPE_BITS; ++ gsm->escape = 0; ++ } ++ switch (gsm->state) { ++ case GSM_START: /* First byte after SOF */ ++ gsm->address = 0; ++ gsm->state = GSM_ADDRESS; ++ gsm->fcs = INIT_FCS; ++ /* Drop through */ ++ case GSM_ADDRESS: /* Address continuation */ ++ gsm->fcs = gsm_fcs_add(gsm->fcs, c); ++ if (gsm_read_ea(&gsm->address, c)) ++ gsm->state = GSM_CONTROL; ++ break; ++ case GSM_CONTROL: /* Control Byte */ ++ gsm->fcs = gsm_fcs_add(gsm->fcs, c); ++ gsm->control = c; ++ gsm->count = 0; ++ gsm->state = GSM_DATA; ++ break; ++ case GSM_DATA: /* Data */ ++ if (gsm->count > gsm->mru ) { /* Allow one for the FCS */ ++ gsm->state = GSM_OVERRUN; ++ gsm->bad_size++; ++ } else ++ gsm->buf[gsm->count++] = c; ++ break; ++ case GSM_OVERRUN: /* Over-long - eg a dropped SOF */ ++ break; ++ } ++} ++ ++/** ++ * gsm_error - handle tty error ++ * @gsm: ldisc data ++ * @data: byte received (may be invalid) ++ * @flag: error received ++ * ++ * Handle an error in the receipt of data for a frame. Currently we just ++ * go back to hunting for a SOF. ++ * ++ * FIXME: better diagnostics ? ++ */ ++ ++static void gsm_error(struct gsm_mux *gsm, ++ unsigned char data, unsigned char flag) ++{ ++ gsm->state = GSM_SEARCH; ++ gsm->io_error++; ++} ++ ++/** ++ * gsm_cleanup_mux - generic GSM protocol cleanup ++ * @gsm: our mux ++ * ++ * Clean up the bits of the mux which are the same for all framing ++ * protocols. Remove the mux from the mux table, stop all the timers ++ * and then shut down each device hanging up the channels as we go. ++ */ ++ ++void gsm_cleanup_mux(struct gsm_mux *gsm) ++{ ++ int i; ++ struct gsm_dlci *dlci = gsm->dlci[0]; ++ struct gsm_msg *txq; ++ ++ gsm->dead = 1; ++ ++ spin_lock(&gsm_mux_lock); ++ for (i = 0; i < MAX_MUX; i++) { ++ if (gsm_mux[i] == gsm) { ++ gsm_mux[i] = NULL; ++ break; ++ } ++ } ++ spin_unlock(&gsm_mux_lock); ++ WARN_ON(i == MAX_MUX); ++ ++ del_timer_sync(&gsm->t2_timer); ++ /* Now we are sure T2 has stopped */ ++ if (dlci) { ++ dlci->dead = 1; ++ gsm_dlci_begin_close(dlci); ++ wait_event_interruptible(gsm->event, ++ dlci->state == DLCI_CLOSED); ++ } ++ /* Free up any link layer users */ ++ for (i = 0; i < NUM_DLCI; i++) ++ if (gsm->dlci[i]) ++ gsm_dlci_free(gsm->dlci[i]); ++ /* Now wipe the queues */ ++ for (txq = gsm->tx_head; txq != NULL; txq = gsm->tx_head) { ++ gsm->tx_head = txq->next; ++ kfree(txq); ++ } ++ gsm->tx_tail = NULL; ++} ++EXPORT_SYMBOL_GPL(gsm_cleanup_mux); ++ ++/** ++ * gsm_activate_mux - generic GSM setup ++ * @gsm: our mux ++ * ++ * Set up the bits of the mux which are the same for all framing ++ * protocols. Add the mux to the mux table so it can be opened and ++ * finally kick off connecting to DLCI 0 on the modem. ++ */ ++ ++int gsm_activate_mux(struct gsm_mux *gsm) ++{ ++ struct gsm_dlci *dlci; ++ int i = 0; ++ ++ init_timer(&gsm->t2_timer); ++ gsm->t2_timer.function = gsm_control_retransmit; ++ gsm->t2_timer.data = (unsigned long)gsm; ++ init_waitqueue_head(&gsm->event); ++ spin_lock_init(&gsm->control_lock); ++ spin_lock_init(&gsm->tx_lock); ++ ++ if (gsm->encoding == 0) ++ gsm->receive = gsm0_receive; ++ else ++ gsm->receive = gsm1_receive; ++ gsm->error = gsm_error; ++ ++ spin_lock(&gsm_mux_lock); ++ for (i = 0; i < MAX_MUX; i++) { ++ if (gsm_mux[i] == NULL) { ++ gsm_mux[i] = gsm; ++ break; ++ } ++ } ++ spin_unlock(&gsm_mux_lock); ++ if (i == MAX_MUX) ++ return -EBUSY; ++ ++ dlci = gsm_dlci_alloc(gsm, 0); ++ if (dlci == NULL) ++ return -ENOMEM; ++ gsm->dead = 0; /* Tty opens are now permissible */ ++ return 0; ++} ++EXPORT_SYMBOL_GPL(gsm_activate_mux); ++ ++/** ++ * gsm_free_mux - free up a mux ++ * @mux: mux to free ++ * ++ * Dispose of allocated resources for a dead mux. No refcounting ++ * at present so the mux must be truely dead. ++ */ ++void gsm_free_mux(struct gsm_mux *gsm) ++{ ++ kfree(gsm->txframe); ++ kfree(gsm->buf); ++ kfree(gsm); ++} ++EXPORT_SYMBOL_GPL(gsm_free_mux); ++ ++/** ++ * gsm_alloc_mux - allocate a mux ++ * ++ * Creates a new mux ready for activation. ++ */ ++ ++struct gsm_mux *gsm_alloc_mux(void) ++{ ++ struct gsm_mux *gsm = kzalloc(sizeof(struct gsm_mux), GFP_KERNEL); ++ if (gsm == NULL) ++ return NULL; ++ gsm->buf = kmalloc(MAX_MRU + 1, GFP_KERNEL); ++ if (gsm->buf == NULL) { ++ kfree(gsm); ++ return NULL; ++ } ++ gsm->txframe = kmalloc(2 * MAX_MRU + 2, GFP_KERNEL); ++ if (gsm->txframe == NULL) { ++ kfree(gsm->buf); ++ kfree(gsm); ++ return NULL; ++ } ++ spin_lock_init(&gsm->lock); ++ ++ gsm->t1 = T1; ++ gsm->t2 = T2; ++ gsm->n2 = N2; ++ gsm->ftype = UIH; ++ gsm->initiator = 0; ++ gsm->adaption = 1; ++ gsm->encoding = 1; ++ gsm->mru = 64; /* Default to encoding 1 so these should be 64 */ ++ gsm->mtu = 64; ++ gsm->dead = 1; /* Avoid early tty opens */ ++ ++ return gsm; ++} ++EXPORT_SYMBOL_GPL(gsm_alloc_mux); ++ ++ ++ ++ ++/** ++ * gsmld_output - write to link ++ * @gsm: our mux ++ * @data: bytes to output ++ * @len: size ++ * ++ * Write a block of data from the GSM mux to the data channel. This ++ * will eventually be serialized from above but at the moment isn't. ++ */ ++ ++static int gsmld_output(struct gsm_mux *gsm, u8 *data, int len) ++{ ++ if (tty_write_room(gsm->tty) < len) { ++ set_bit(TTY_DO_WRITE_WAKEUP, &gsm->tty->flags); ++ return -ENOSPC; ++ } ++ if (debug & 4) { ++ printk("-->%d bytes out\n", len); ++ hex_packet(data, len); ++ } ++ gsm->tty->ops->write(gsm->tty, data, len); ++ return len; ++} ++ ++/** ++ * gsmld_attach_gsm - mode set up ++ * @tty: our tty structure ++ * @gsm: our mux ++ * ++ * Set up the MUX for basic mode and commence connecting to the ++ * modem. Currently called from the line discipline set up but ++ * will need moving to an ioctl path. ++ */ ++ ++static int gsmld_attach_gsm(struct tty_struct *tty, struct gsm_mux *gsm) ++{ ++ int ret; ++ ++ gsm->tty = tty_kref_get(tty); ++ gsm->output = gsmld_output; ++ ret = gsm_activate_mux(gsm); ++ if (ret != 0) ++ tty_kref_put(gsm->tty); ++ return ret; ++} ++ ++ ++/** ++ * gsmld_detach_gsm - stop doing 0710 mux ++ * @tty: tty atttached to the mux ++ * @gsm: mux ++ * ++ * Shutdown and then clean up the resources used by the line discipline ++ */ ++ ++static void gsmld_detach_gsm(struct tty_struct *tty, struct gsm_mux *gsm) ++{ ++ WARN_ON(tty != gsm->tty); ++ gsm_cleanup_mux(gsm); ++ tty_kref_put(gsm->tty); ++ gsm->tty = NULL; ++} ++ ++static void gsmld_receive_buf(struct tty_struct *tty, const unsigned char *cp, ++ char *fp, int count) ++{ ++ struct gsm_mux *gsm = tty->disc_data; ++ const unsigned char *dp; ++ char *f; ++ int i; ++ char buf[64]; ++ char flags; ++ ++ if (debug & 4) { ++ printk("Inbytes %dd\n", count); ++ hex_packet(cp, count); ++ } ++ ++ for (i = count, dp = cp, f = fp; i; i--, dp++) { ++ flags = *f++; ++ switch (flags) { ++ case TTY_NORMAL: ++ gsm->receive(gsm, *dp); ++ break; ++ case TTY_OVERRUN: ++ case TTY_BREAK: ++ case TTY_PARITY: ++ case TTY_FRAME: ++ gsm->error(gsm, *dp, flags); ++ break; ++ default: ++ printk(KERN_ERR "%s: unknown flag %d\n", ++ tty_name(tty, buf), flags); ++ break; ++ } ++ } ++ /* FASYNC if needed ? */ ++ /* If clogged call tty_throttle(tty); */ ++} ++ ++/** ++ * gsmld_chars_in_buffer - report available bytes ++ * @tty: tty device ++ * ++ * Report the number of characters buffered to be delivered to user ++ * at this instant in time. ++ * ++ * Locking: gsm lock ++ */ ++ ++static ssize_t gsmld_chars_in_buffer(struct tty_struct *tty) ++{ ++ return 0; ++} ++ ++/** ++ * gsmld_flush_buffer - clean input queue ++ * @tty: terminal device ++ * ++ * Flush the input buffer. Called when the line discipline is ++ * being closed, when the tty layer wants the buffer flushed (eg ++ * at hangup). ++ */ ++ ++static void gsmld_flush_buffer(struct tty_struct *tty) ++{ ++} ++ ++/** ++ * gsmld_close - close the ldisc for this tty ++ * @tty: device ++ * ++ * Called from the terminal layer when this line discipline is ++ * being shut down, either because of a close or becsuse of a ++ * discipline change. The function will not be called while other ++ * ldisc methods are in progress. ++ */ ++ ++static void gsmld_close(struct tty_struct *tty) ++{ ++ struct gsm_mux *gsm = tty->disc_data; ++ ++ gsmld_detach_gsm(tty, gsm); ++ ++ gsmld_flush_buffer(tty); ++ /* Do other clean up here */ ++ gsm_free_mux(gsm); ++} ++ ++/** ++ * gsmld_open - open an ldisc ++ * @tty: terminal to open ++ * ++ * Called when this line discipline is being attached to the ++ * terminal device. Can sleep. Called serialized so that no ++ * other events will occur in parallel. No further open will occur ++ * until a close. ++ */ ++ ++static int gsmld_open(struct tty_struct *tty) ++{ ++ struct gsm_mux *gsm; ++ ++ if (tty->ops->write == NULL) ++ return -EINVAL; ++ ++ /* Attach our ldisc data */ ++ gsm = gsm_alloc_mux(); ++ if (gsm == NULL) ++ return -ENOMEM; ++ ++ tty->disc_data = gsm; ++ tty->receive_room = 65536; ++ ++ /* Attach the initial passive connection */ ++ gsm->encoding = 1; ++ return gsmld_attach_gsm(tty, gsm); ++} ++ ++/** ++ * gsmld_write_wakeup - asynchronous I/O notifier ++ * @tty: tty device ++ * ++ * Required for the ptys, serial driver etc. since processes ++ * that attach themselves to the master and rely on ASYNC ++ * IO must be woken up ++ */ ++ ++static void gsmld_write_wakeup(struct tty_struct *tty) ++{ ++ struct gsm_mux *gsm = tty->disc_data; ++ ++ /* Queue poll */ ++ clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); ++ gsm_data_kick(gsm); ++ if (gsm->tx_bytes < TX_THRESH_LO) ++ gsm_dlci_data_sweep(gsm); ++} ++ ++/** ++ * gsmld_read - read function for tty ++ * @tty: tty device ++ * @file: file object ++ * @buf: userspace buffer pointer ++ * @nr: size of I/O ++ * ++ * Perform reads for the line discipline. We are guaranteed that the ++ * line discipline will not be closed under us but we may get multiple ++ * parallel readers and must handle this ourselves. We may also get ++ * a hangup. Always called in user context, may sleep. ++ * ++ * This code must be sure never to sleep through a hangup. ++ */ ++ ++static ssize_t gsmld_read(struct tty_struct *tty, struct file *file, ++ unsigned char __user *buf, size_t nr) ++{ ++ return -EOPNOTSUPP; ++} ++ ++/** ++ * gsmld_write - write function for tty ++ * @tty: tty device ++ * @file: file object ++ * @buf: userspace buffer pointer ++ * @nr: size of I/O ++ * ++ * Called when the owner of the device wants to send a frame ++ * itself (or some other control data). The data is transferred ++ * as-is and must be properly framed and checksummed as appropriate ++ * by userspace. Frames are either sent whole or not at all as this ++ * avoids pain user side. ++ */ ++ ++static ssize_t gsmld_write(struct tty_struct *tty, struct file *file, ++ const unsigned char *buf, size_t nr) ++{ ++ int space = tty_write_room(tty); ++ if (space >= nr) ++ return tty->ops->write(tty, buf, nr); ++ set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); ++ return -ENOBUFS; ++} ++ ++/** ++ * gsmld_poll - poll method for N_GSM0710 ++ * @tty: terminal device ++ * @file: file accessing it ++ * @wait: poll table ++ * ++ * Called when the line discipline is asked to poll() for data or ++ * for special events. This code is not serialized with respect to ++ * other events save open/close. ++ * ++ * This code must be sure never to sleep through a hangup. ++ * Called without the kernel lock held - fine ++ */ ++ ++static unsigned int gsmld_poll(struct tty_struct *tty, struct file *file, ++ poll_table *wait) ++{ ++ unsigned int mask = 0; ++ struct gsm_mux *gsm = tty->disc_data; ++ ++ poll_wait(file, &tty->read_wait, wait); ++ poll_wait(file, &tty->write_wait, wait); ++ if (tty_hung_up_p(file)) ++ mask |= POLLHUP; ++ if (!tty_is_writelocked(tty) && tty_write_room(tty) > 0) ++ mask |= POLLOUT | POLLWRNORM; ++ if (gsm->dead) ++ mask |= POLLHUP; ++ return mask; ++} ++ ++static int gsmld_config(struct tty_struct *tty, struct gsm_mux *gsm, ++ struct gsm_config *c) ++{ ++ int need_close = 0; ++ int need_restart = 0; ++ ++ /* Stuff we don't support yet - UI or I frame transport, windowing */ ++ if ((c->adaption !=1 && c->adaption != 2) || c->k) ++ return -EOPNOTSUPP; ++ /* Check the MRU/MTU range looks sane */ ++ if (c->mru > MAX_MRU || c->mtu > MAX_MTU || c->mru < 8 || c->mtu < 8) ++ return -EINVAL; ++ if (c->n2 < 3) ++ return -EINVAL; ++ if (c->encapsulation > 1) /* Basic, advanced, no I */ ++ return -EINVAL; ++ if (c->initiator > 1) ++ return -EINVAL; ++ if (c->i == 0 || c->i > 2) /* UIH and UI only */ ++ return -EINVAL; ++ /* ++ * See what is needed for reconfiguration ++ */ ++ ++ /* Timing fields */ ++ if (c->t1 != 0 && c->t1 != gsm->t1) ++ need_restart = 1; ++ if (c->t2 != 0 && c->t2 != gsm->t2) ++ need_restart = 1; ++ if (c->encapsulation != gsm->encoding) ++ need_restart = 1; ++ if (c->adaption != gsm->adaption) ++ need_restart = 1; ++ /* Requires care */ ++ if (c->initiator != gsm->initiator) ++ need_close = 1; ++ if (c->mru != gsm->mru) ++ need_restart = 1; ++ if (c->mtu != gsm->mtu) ++ need_restart = 1; ++ ++ /* ++ * Close down what is needed, restart and initiate the new ++ * configuration ++ */ ++ ++ if (need_close || need_restart) { ++ gsm_dlci_begin_close(gsm->dlci[0]); ++ /* This will timeout if the link is down due to N2 expiring */ ++ wait_event_interruptible(gsm->event, ++ gsm->dlci[0]->state == DLCI_CLOSED); ++ if (signal_pending(current)) ++ return -EINTR; ++ } ++ if (need_restart) ++ gsm_cleanup_mux(gsm); ++ ++ gsm->initiator = c->initiator; ++ gsm->mru = c->mru; ++ gsm->encoding = c->encapsulation; ++ gsm->adaption = c->adaption; ++ ++ if (c->i == 1) ++ gsm->ftype = UIH; ++ else if (c->i == 2) ++ gsm->ftype = UI; ++ ++ if (c->t1) ++ gsm->t1 = c->t1; ++ if (c->t2) ++ gsm->t2 = c->t2; ++ ++ /* FIXME: We need to separate activation/deactivation from adding ++ and removing from the mux array */ ++ if (need_restart) ++ gsm_activate_mux(gsm); ++ if (gsm->initiator && need_close) ++ gsm_dlci_begin_open(gsm->dlci[0]); ++ return 0; ++} ++ ++static int gsmld_ioctl(struct tty_struct *tty, struct file *file, ++ unsigned int cmd, unsigned long arg) ++{ ++ struct gsm_config c; ++ struct gsm_mux *gsm = tty->disc_data; ++ ++ switch (cmd) { ++ case GSMIOC_GETCONF: ++ memset(&c, 0, sizeof(c)); ++ c.adaption = gsm->adaption; ++ c.encapsulation = gsm->encoding; ++ c.initiator = gsm->initiator; ++ c.t1 = gsm->t1; ++ c.t2 = gsm->t2; ++ c.t3 = 0; /* Not supported */ ++ c.n2 = gsm->n2; ++ if (gsm->ftype == UIH) ++ c.i = 1; ++ else ++ c.i = 2; ++ printk("Ftype %d i %d\n", gsm->ftype, c.i); ++ c.mru = gsm->mru; ++ c.mtu = gsm->mtu; ++ c.k = 0; ++ if (copy_to_user((void *)arg, &c, sizeof(c))) ++ return -EFAULT; ++ return 0; ++ case GSMIOC_SETCONF: ++ if (copy_from_user(&c, (void *)arg, sizeof(c))) ++ return -EFAULT; ++ return gsmld_config(tty, gsm, &c); ++ default: ++ return n_tty_ioctl_helper(tty, file, cmd, arg); ++ } ++} ++ ++ ++/* Line discipline for real tty */ ++struct tty_ldisc_ops tty_ldisc_packet = { ++ .owner = THIS_MODULE, ++ .magic = TTY_LDISC_MAGIC, ++ .name = "n_gsm", ++ .open = gsmld_open, ++ .close = gsmld_close, ++ .flush_buffer = gsmld_flush_buffer, ++ .chars_in_buffer = gsmld_chars_in_buffer, ++ .read = gsmld_read, ++ .write = gsmld_write, ++ .ioctl = gsmld_ioctl, ++ .poll = gsmld_poll, ++ .receive_buf = gsmld_receive_buf, ++ .write_wakeup = gsmld_write_wakeup ++}; ++ ++/* ++ * Virtual tty side ++ */ ++ ++#define TX_SIZE 512 ++ ++static int gsmtty_modem_update(struct gsm_dlci *dlci, u8 brk) ++{ ++ u8 modembits[5]; ++ struct gsm_control *ctrl; ++ int len = 2; ++ ++ if (brk) ++ len++; ++ ++ modembits[0] = len << 1 | EA; /* Data bytes */ ++ modembits[1] = dlci->addr << 2 | 3; /* DLCI, EA, 1 */ ++ modembits[2] = gsm_encode_modem(dlci) << 1 | EA; ++ if (brk) ++ modembits[3] = brk << 4 | 2 | EA; /* Valid, EA */ ++ ctrl = gsm_control_send(dlci->gsm, CMD_MSC, modembits, len + 1); ++ if (ctrl == NULL) ++ return -ENOMEM; ++ return gsm_control_wait(dlci->gsm, ctrl); ++} ++ ++static int gsm_carrier_raised(struct tty_port *port) ++{ ++ struct gsm_dlci *dlci = container_of(port, struct gsm_dlci, port); ++ /* Not yet open so no carrier info */ ++ if (dlci->state != DLCI_OPEN) ++ return 0; ++ if (debug & 2) ++ return 1; ++ return dlci->modem_rx & TIOCM_CD; ++} ++ ++static void gsm_dtr_rts(struct tty_port *port, int onoff) ++{ ++ struct gsm_dlci *dlci = container_of(port, struct gsm_dlci, port); ++ unsigned int modem_tx = dlci->modem_tx; ++ if (onoff) ++ modem_tx |= TIOCM_DTR | TIOCM_RTS; ++ else ++ modem_tx &= ~(TIOCM_DTR | TIOCM_RTS); ++ if (modem_tx != dlci->modem_tx) { ++ dlci->modem_tx = modem_tx; ++ gsmtty_modem_update(dlci, 0); ++ } ++} ++ ++static const struct tty_port_operations gsm_port_ops = { ++ .carrier_raised = gsm_carrier_raised, ++ .dtr_rts = gsm_dtr_rts, ++}; ++ ++ ++static int gsmtty_open(struct tty_struct *tty, struct file *filp) ++{ ++ struct gsm_mux *gsm; ++ struct gsm_dlci *dlci; ++ struct tty_port *port; ++ unsigned int line = tty->index; ++ unsigned int mux = line >> 6; ++ ++ line = line & 0x3F; ++ ++ if (mux >= MAX_MUX) ++ return -ENXIO; ++ /* FIXME: we need to lock gsm_mux for lifetimes of ttys eventually */ ++ if (gsm_mux[mux] == NULL) ++ return -EUNATCH; ++ if (line == 0 || line > 61) /* 62/63 reserved */ ++ return -ECHRNG; ++ gsm = gsm_mux[mux]; ++ if (gsm->dead) ++ return -EL2HLT; ++ dlci = gsm->dlci[line]; ++ if (dlci == NULL) ++ dlci = gsm_dlci_alloc(gsm, line); ++ if (dlci == NULL) ++ return -ENOMEM; ++ port = &dlci->port; ++ port->count++; ++ tty->driver_data = dlci; ++ tty_port_tty_set(port, tty); ++ ++ dlci->modem_rx = 0; ++ /* We could in theory open and close before we wait - eg if we get ++ a DM straight back. This is ok as that will have caused a hangup */ ++ set_bit(ASYNCB_INITIALIZED, &port->flags); ++ /* Start sending off SABM messages */ ++ gsm_dlci_begin_open(dlci); ++ /* And wait for virtual carrier */ ++ return tty_port_block_til_ready(port, tty, filp); ++} ++ ++static void gsmtty_close(struct tty_struct *tty, struct file *filp) ++{ ++ struct gsm_dlci *dlci = tty->driver_data; ++ if (dlci == NULL) ++ return; ++ if (tty_port_close_start(&dlci->port, tty, filp) == 0) ++ return; ++ gsm_dlci_begin_close(dlci); ++ tty_port_close_end(&dlci->port, tty); ++ tty_port_tty_set(&dlci->port, NULL); ++} ++ ++static void gsmtty_hangup(struct tty_struct *tty) ++{ ++ struct gsm_dlci *dlci = tty->driver_data; ++ tty_port_hangup(&dlci->port); ++ gsm_dlci_begin_close(dlci); ++} ++ ++static int gsmtty_write(struct tty_struct *tty, const unsigned char *buf, ++ int len) ++{ ++ struct gsm_dlci *dlci = tty->driver_data; ++ /* Stuff the bytes into the fifo queue */ ++ int sent = kfifo_in_locked(dlci->fifo, buf, len, &dlci->lock); ++ /* Need to kick the channel */ ++ gsm_dlci_data_kick(dlci); ++ return sent; ++} ++ ++static int gsmtty_write_room(struct tty_struct *tty) ++{ ++ struct gsm_dlci *dlci = tty->driver_data; ++ return TX_SIZE - kfifo_len(dlci->fifo); ++} ++ ++static int gsmtty_chars_in_buffer(struct tty_struct *tty) ++{ ++ struct gsm_dlci *dlci = tty->driver_data; ++ return kfifo_len(dlci->fifo); ++} ++ ++static void gsmtty_flush_buffer(struct tty_struct *tty) ++{ ++ struct gsm_dlci *dlci = tty->driver_data; ++ /* Caution needed: If we implement reliable transport classes ++ then the data being transmitted can't simply be junked once ++ it has first hit the stack. Until then we can just blow it ++ away */ ++ kfifo_reset(dlci->fifo); ++ /* Need to unhook this DLCI from the transmit queue logic */ ++} ++ ++static void gsmtty_wait_until_sent(struct tty_struct *tty, int timeout) ++{ ++ /* The FIFO handles the queue so the kernel will do the right ++ thing waiting on chars_in_buffer before calling us. No work ++ to do here */ ++} ++ ++static int gsmtty_tiocmget(struct tty_struct *tty, struct file *filp) ++{ ++ struct gsm_dlci *dlci = tty->driver_data; ++ return dlci->modem_rx; ++} ++ ++static int gsmtty_tiocmset(struct tty_struct *tty, struct file *filp, ++ unsigned int set, unsigned int clear) ++{ ++ struct gsm_dlci *dlci = tty->driver_data; ++ unsigned int modem_tx = dlci->modem_tx; ++ ++ modem_tx &= clear; ++ modem_tx |= set; ++ ++ if (modem_tx != dlci->modem_tx) { ++ dlci->modem_tx = modem_tx; ++ return gsmtty_modem_update(dlci, 0); ++ } ++ return 0; ++} ++ ++ ++static int gsmtty_ioctl(struct tty_struct *tty, struct file *filp, ++ unsigned int cmd, unsigned long arg) ++{ ++ return -ENOIOCTLCMD; ++} ++ ++static void gsmtty_set_termios(struct tty_struct *tty, struct ktermios *old) ++{ ++ /* For the moment its fixed. In actual fact the speed information ++ for the virtual channel can be propogated in both directions by ++ the RPN control message. This however rapidly gets nasty as we ++ then have to remap modem signals each way according to whether ++ our virtual cable is null modem etc .. */ ++ tty_termios_copy_hw(tty->termios, old); ++} ++ ++static void gsmtty_throttle(struct tty_struct *tty) ++{ ++ struct gsm_dlci *dlci = tty->driver_data; ++ if (tty->termios->c_cflag & CRTSCTS) ++ dlci->modem_tx &= ~TIOCM_DTR; ++ dlci->throttled = 1; ++ /* Send an MSC with DTR cleared */ ++ gsmtty_modem_update(dlci, 0); ++} ++ ++static void gsmtty_unthrottle(struct tty_struct *tty) ++{ ++ struct gsm_dlci *dlci = tty->driver_data; ++ if (tty->termios->c_cflag & CRTSCTS) ++ dlci->modem_tx |= TIOCM_DTR; ++ dlci->throttled = 0; ++ /* Send an MSC with DTR set */ ++ gsmtty_modem_update(dlci, 0); ++} ++ ++static int gsmtty_break_ctl(struct tty_struct *tty, int state) ++{ ++ struct gsm_dlci *dlci = tty->driver_data; ++ int encode = 0; /* Off */ ++ ++ if (state == -1) /* "On indefinitely" - we can't encode this ++ properly */ ++ encode = 0x0F; ++ else if (state > 0) { ++ encode = state / 200; /* mS to encoding */ ++ if (encode > 0x0F) ++ encode = 0x0F; /* Best effort */ ++ } ++ return gsmtty_modem_update(dlci, encode); ++} ++ ++static struct tty_driver *gsm_tty_driver; ++ ++/* Virtual ttys for the demux */ ++static const struct tty_operations gsmtty_ops = { ++ .open = gsmtty_open, ++ .close = gsmtty_close, ++ .write = gsmtty_write, ++ .write_room = gsmtty_write_room, ++ .chars_in_buffer = gsmtty_chars_in_buffer, ++ .flush_buffer = gsmtty_flush_buffer, ++ .ioctl = gsmtty_ioctl, ++ .throttle = gsmtty_throttle, ++ .unthrottle = gsmtty_unthrottle, ++ .set_termios = gsmtty_set_termios, ++ .hangup = gsmtty_hangup, ++ .wait_until_sent = gsmtty_wait_until_sent, ++ .tiocmget = gsmtty_tiocmget, ++ .tiocmset = gsmtty_tiocmset, ++ .break_ctl = gsmtty_break_ctl, ++}; ++ ++ ++ ++static int __init gsm_init(void) ++{ ++ /* Fill in our line protocol discipline, and register it */ ++ int status = tty_register_ldisc(N_GSM0710, &tty_ldisc_packet); ++ if (status != 0) { ++ printk(KERN_ERR "n_gsm: can't register line discipline (err = %d)\n", status); ++ return status; ++ } ++ ++ gsm_tty_driver = alloc_tty_driver(256); ++ if (!gsm_tty_driver) { ++ tty_unregister_ldisc(N_GSM0710); ++ printk(KERN_ERR "gsm_init: tty allocation failed.\n"); ++ return -EINVAL; ++ } ++ gsm_tty_driver->owner = THIS_MODULE; ++ gsm_tty_driver->driver_name = "gsmtty"; ++ gsm_tty_driver->name = "gsmtty"; ++ gsm_tty_driver->major = 0; /* Dynamic */ ++ gsm_tty_driver->minor_start = 0; ++ gsm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL; ++ gsm_tty_driver->subtype = SERIAL_TYPE_NORMAL; ++ gsm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV ++ | TTY_DRIVER_HARDWARE_BREAK; ++ gsm_tty_driver->init_termios = tty_std_termios; ++ /* Fixme */ ++ gsm_tty_driver->init_termios.c_lflag &= ~ECHO; ++ tty_set_operations(gsm_tty_driver, &gsmtty_ops); ++ ++ spin_lock_init(&gsm_mux_lock); ++ ++ if (tty_register_driver(gsm_tty_driver)) { ++ put_tty_driver(gsm_tty_driver); ++ tty_unregister_ldisc(N_GSM0710); ++ printk(KERN_ERR "gsm_init: tty registration failed.\n"); ++ return -EBUSY; ++ } ++ printk(KERN_INFO "gsm_init: loaded as %d,%d.\n", gsm_tty_driver->major, gsm_tty_driver->minor_start); ++ return 0; ++} ++ ++static void __exit gsm_exit(void) ++{ ++ int status = tty_unregister_ldisc(N_GSM0710); ++ if (status != 0) ++ printk(KERN_ERR "n_gsm: can't unregister line discipline (err = %d)\n", status); ++ tty_unregister_driver(gsm_tty_driver); ++ put_tty_driver(gsm_tty_driver); ++ printk(KERN_INFO "gsm_init: unloaded.\n"); ++} ++ ++module_init(gsm_init); ++module_exit(gsm_exit); ++ ++ ++MODULE_LICENSE("GPL"); ++MODULE_ALIAS_LDISC(N_GSM0710); +--- /dev/null ++++ b/include/linux/gsmmux.h +@@ -0,0 +1,25 @@ ++#ifndef _LINUX_GSMMUX_H ++#define _LINUX_GSMMUX_H ++ ++struct gsm_config ++{ ++ unsigned int adaption; ++ unsigned int encapsulation; ++ unsigned int initiator; ++ unsigned int t1; ++ unsigned int t2; ++ unsigned int t3; ++ unsigned int n2; ++ unsigned int mru; ++ unsigned int mtu; ++ unsigned int k; ++ unsigned int i; ++ unsigned int unused[8]; /* Padding for expansion without ++ breaking stuff */ ++}; ++ ++#define GSMIOC_GETCONF _IOR('G', 0, struct gsm_config) ++#define GSMIOC_SETCONF _IOW('G', 1, struct gsm_config) ++ ++ ++#endif +--- a/include/linux/tty.h ++++ b/include/linux/tty.h +@@ -46,8 +46,9 @@ + #define N_GIGASET_M101 16 /* Siemens Gigaset M101 serial DECT adapter */ + #define N_SLCAN 17 /* Serial / USB serial CAN Adaptors */ + #define N_PPS 18 /* Pulse per Second */ +- + #define N_V253 19 /* Codec control over voice modem */ ++#define N_GSM0710 20 /* GSM 0710 Mux */ ++ + + /* + * This character is the same as _POSIX_VDISABLE: it cannot be used as |