diff options
author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
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committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
commit | 57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch) | |
tree | 5e910f0e82173f4ef4f51111366a3f1299037a7b /drivers/isdn/gigaset/interface.c |
Initial import
Diffstat (limited to 'drivers/isdn/gigaset/interface.c')
-rw-r--r-- | drivers/isdn/gigaset/interface.c | 605 |
1 files changed, 605 insertions, 0 deletions
diff --git a/drivers/isdn/gigaset/interface.c b/drivers/isdn/gigaset/interface.c new file mode 100644 index 000000000..600c79b03 --- /dev/null +++ b/drivers/isdn/gigaset/interface.c @@ -0,0 +1,605 @@ +/* + * interface to user space for the gigaset driver + * + * Copyright (c) 2004 by Hansjoerg Lipp <hjlipp@web.de> + * + * ===================================================================== + * 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 "gigaset.h" +#include <linux/gigaset_dev.h> +#include <linux/tty_flip.h> +#include <linux/module.h> + +/*** our ioctls ***/ + +static int if_lock(struct cardstate *cs, int *arg) +{ + int cmd = *arg; + + gig_dbg(DEBUG_IF, "%u: if_lock (%d)", cs->minor_index, cmd); + + if (cmd > 1) + return -EINVAL; + + if (cmd < 0) { + *arg = cs->mstate == MS_LOCKED; + return 0; + } + + if (!cmd && cs->mstate == MS_LOCKED && cs->connected) { + cs->ops->set_modem_ctrl(cs, 0, TIOCM_DTR | TIOCM_RTS); + cs->ops->baud_rate(cs, B115200); + cs->ops->set_line_ctrl(cs, CS8); + cs->control_state = TIOCM_DTR | TIOCM_RTS; + } + + cs->waiting = 1; + if (!gigaset_add_event(cs, &cs->at_state, EV_IF_LOCK, + NULL, cmd, NULL)) { + cs->waiting = 0; + return -ENOMEM; + } + gigaset_schedule_event(cs); + + wait_event(cs->waitqueue, !cs->waiting); + + if (cs->cmd_result >= 0) { + *arg = cs->cmd_result; + return 0; + } + + return cs->cmd_result; +} + +static int if_version(struct cardstate *cs, unsigned arg[4]) +{ + static const unsigned version[4] = GIG_VERSION; + static const unsigned compat[4] = GIG_COMPAT; + unsigned cmd = arg[0]; + + gig_dbg(DEBUG_IF, "%u: if_version (%d)", cs->minor_index, cmd); + + switch (cmd) { + case GIGVER_DRIVER: + memcpy(arg, version, sizeof version); + return 0; + case GIGVER_COMPAT: + memcpy(arg, compat, sizeof compat); + return 0; + case GIGVER_FWBASE: + cs->waiting = 1; + if (!gigaset_add_event(cs, &cs->at_state, EV_IF_VER, + NULL, 0, arg)) { + cs->waiting = 0; + return -ENOMEM; + } + gigaset_schedule_event(cs); + + wait_event(cs->waitqueue, !cs->waiting); + + if (cs->cmd_result >= 0) + return 0; + + return cs->cmd_result; + default: + return -EINVAL; + } +} + +static int if_config(struct cardstate *cs, int *arg) +{ + gig_dbg(DEBUG_IF, "%u: if_config (%d)", cs->minor_index, *arg); + + if (*arg != 1) + return -EINVAL; + + if (cs->mstate != MS_LOCKED) + return -EBUSY; + + if (!cs->connected) { + pr_err("%s: not connected\n", __func__); + return -ENODEV; + } + + *arg = 0; + return gigaset_enterconfigmode(cs); +} + +/*** the terminal driver ***/ + +static int if_open(struct tty_struct *tty, struct file *filp) +{ + struct cardstate *cs; + + gig_dbg(DEBUG_IF, "%d+%d: %s()", + tty->driver->minor_start, tty->index, __func__); + + cs = gigaset_get_cs_by_tty(tty); + if (!cs || !try_module_get(cs->driver->owner)) + return -ENODEV; + + if (mutex_lock_interruptible(&cs->mutex)) { + module_put(cs->driver->owner); + return -ERESTARTSYS; + } + tty->driver_data = cs; + + ++cs->port.count; + + if (cs->port.count == 1) { + tty_port_tty_set(&cs->port, tty); + cs->port.low_latency = 1; + } + + mutex_unlock(&cs->mutex); + return 0; +} + +static void if_close(struct tty_struct *tty, struct file *filp) +{ + struct cardstate *cs = tty->driver_data; + + if (!cs) { /* happens if we didn't find cs in open */ + gig_dbg(DEBUG_IF, "%s: no cardstate", __func__); + return; + } + + gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__); + + mutex_lock(&cs->mutex); + + if (!cs->connected) + gig_dbg(DEBUG_IF, "not connected"); /* nothing to do */ + else if (!cs->port.count) + dev_warn(cs->dev, "%s: device not opened\n", __func__); + else if (!--cs->port.count) + tty_port_tty_set(&cs->port, NULL); + + mutex_unlock(&cs->mutex); + + module_put(cs->driver->owner); +} + +static int if_ioctl(struct tty_struct *tty, + unsigned int cmd, unsigned long arg) +{ + struct cardstate *cs = tty->driver_data; + int retval = -ENODEV; + int int_arg; + unsigned char buf[6]; + unsigned version[4]; + + gig_dbg(DEBUG_IF, "%u: %s(0x%x)", cs->minor_index, __func__, cmd); + + if (mutex_lock_interruptible(&cs->mutex)) + return -ERESTARTSYS; + + if (!cs->connected) { + gig_dbg(DEBUG_IF, "not connected"); + retval = -ENODEV; + } else { + retval = 0; + switch (cmd) { + case GIGASET_REDIR: + retval = get_user(int_arg, (int __user *) arg); + if (retval >= 0) + retval = if_lock(cs, &int_arg); + if (retval >= 0) + retval = put_user(int_arg, (int __user *) arg); + break; + case GIGASET_CONFIG: + retval = get_user(int_arg, (int __user *) arg); + if (retval >= 0) + retval = if_config(cs, &int_arg); + if (retval >= 0) + retval = put_user(int_arg, (int __user *) arg); + break; + case GIGASET_BRKCHARS: + retval = copy_from_user(&buf, + (const unsigned char __user *) arg, 6) + ? -EFAULT : 0; + if (retval >= 0) { + gigaset_dbg_buffer(DEBUG_IF, "GIGASET_BRKCHARS", + 6, (const unsigned char *) arg); + retval = cs->ops->brkchars(cs, buf); + } + break; + case GIGASET_VERSION: + retval = copy_from_user(version, + (unsigned __user *) arg, sizeof version) + ? -EFAULT : 0; + if (retval >= 0) + retval = if_version(cs, version); + if (retval >= 0) + retval = copy_to_user((unsigned __user *) arg, + version, sizeof version) + ? -EFAULT : 0; + break; + default: + gig_dbg(DEBUG_IF, "%s: arg not supported - 0x%04x", + __func__, cmd); + retval = -ENOIOCTLCMD; + } + } + + mutex_unlock(&cs->mutex); + + return retval; +} + +static int if_tiocmget(struct tty_struct *tty) +{ + struct cardstate *cs = tty->driver_data; + int retval; + + gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__); + + if (mutex_lock_interruptible(&cs->mutex)) + return -ERESTARTSYS; + + retval = cs->control_state & (TIOCM_RTS | TIOCM_DTR); + + mutex_unlock(&cs->mutex); + + return retval; +} + +static int if_tiocmset(struct tty_struct *tty, + unsigned int set, unsigned int clear) +{ + struct cardstate *cs = tty->driver_data; + int retval; + unsigned mc; + + gig_dbg(DEBUG_IF, "%u: %s(0x%x, 0x%x)", + cs->minor_index, __func__, set, clear); + + if (mutex_lock_interruptible(&cs->mutex)) + return -ERESTARTSYS; + + if (!cs->connected) { + gig_dbg(DEBUG_IF, "not connected"); + retval = -ENODEV; + } else { + mc = (cs->control_state | set) & ~clear & (TIOCM_RTS | TIOCM_DTR); + retval = cs->ops->set_modem_ctrl(cs, cs->control_state, mc); + cs->control_state = mc; + } + + mutex_unlock(&cs->mutex); + + return retval; +} + +static int if_write(struct tty_struct *tty, const unsigned char *buf, int count) +{ + struct cardstate *cs = tty->driver_data; + struct cmdbuf_t *cb; + int retval; + + gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__); + + if (mutex_lock_interruptible(&cs->mutex)) + return -ERESTARTSYS; + + if (!cs->connected) { + gig_dbg(DEBUG_IF, "not connected"); + retval = -ENODEV; + goto done; + } + if (cs->mstate != MS_LOCKED) { + dev_warn(cs->dev, "can't write to unlocked device\n"); + retval = -EBUSY; + goto done; + } + if (count <= 0) { + /* nothing to do */ + retval = 0; + goto done; + } + + cb = kmalloc(sizeof(struct cmdbuf_t) + count, GFP_KERNEL); + if (!cb) { + dev_err(cs->dev, "%s: out of memory\n", __func__); + retval = -ENOMEM; + goto done; + } + + memcpy(cb->buf, buf, count); + cb->len = count; + cb->offset = 0; + cb->next = NULL; + cb->wake_tasklet = &cs->if_wake_tasklet; + retval = cs->ops->write_cmd(cs, cb); +done: + mutex_unlock(&cs->mutex); + return retval; +} + +static int if_write_room(struct tty_struct *tty) +{ + struct cardstate *cs = tty->driver_data; + int retval; + + gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__); + + if (mutex_lock_interruptible(&cs->mutex)) + return -ERESTARTSYS; + + if (!cs->connected) { + gig_dbg(DEBUG_IF, "not connected"); + retval = -ENODEV; + } else if (cs->mstate != MS_LOCKED) { + dev_warn(cs->dev, "can't write to unlocked device\n"); + retval = -EBUSY; + } else + retval = cs->ops->write_room(cs); + + mutex_unlock(&cs->mutex); + + return retval; +} + +static int if_chars_in_buffer(struct tty_struct *tty) +{ + struct cardstate *cs = tty->driver_data; + int retval = 0; + + gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__); + + mutex_lock(&cs->mutex); + + if (!cs->connected) + gig_dbg(DEBUG_IF, "not connected"); + else if (cs->mstate != MS_LOCKED) + dev_warn(cs->dev, "can't write to unlocked device\n"); + else + retval = cs->ops->chars_in_buffer(cs); + + mutex_unlock(&cs->mutex); + + return retval; +} + +static void if_throttle(struct tty_struct *tty) +{ + struct cardstate *cs = tty->driver_data; + + gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__); + + mutex_lock(&cs->mutex); + + if (!cs->connected) + gig_dbg(DEBUG_IF, "not connected"); /* nothing to do */ + else + gig_dbg(DEBUG_IF, "%s: not implemented\n", __func__); + + mutex_unlock(&cs->mutex); +} + +static void if_unthrottle(struct tty_struct *tty) +{ + struct cardstate *cs = tty->driver_data; + + gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__); + + mutex_lock(&cs->mutex); + + if (!cs->connected) + gig_dbg(DEBUG_IF, "not connected"); /* nothing to do */ + else + gig_dbg(DEBUG_IF, "%s: not implemented\n", __func__); + + mutex_unlock(&cs->mutex); +} + +static void if_set_termios(struct tty_struct *tty, struct ktermios *old) +{ + struct cardstate *cs = tty->driver_data; + unsigned int iflag; + unsigned int cflag; + unsigned int old_cflag; + unsigned int control_state, new_state; + + gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__); + + mutex_lock(&cs->mutex); + + if (!cs->connected) { + gig_dbg(DEBUG_IF, "not connected"); + goto out; + } + + iflag = tty->termios.c_iflag; + cflag = tty->termios.c_cflag; + old_cflag = old ? old->c_cflag : cflag; + gig_dbg(DEBUG_IF, "%u: iflag %x cflag %x old %x", + cs->minor_index, iflag, cflag, old_cflag); + + /* get a local copy of the current port settings */ + control_state = cs->control_state; + + /* + * Update baud rate. + * Do not attempt to cache old rates and skip settings, + * disconnects screw such tricks up completely. + * Premature optimization is the root of all evil. + */ + + /* reassert DTR and (maybe) RTS on transition from B0 */ + if ((old_cflag & CBAUD) == B0) { + new_state = control_state | TIOCM_DTR; + /* don't set RTS if using hardware flow control */ + if (!(old_cflag & CRTSCTS)) + new_state |= TIOCM_RTS; + gig_dbg(DEBUG_IF, "%u: from B0 - set DTR%s", + cs->minor_index, + (new_state & TIOCM_RTS) ? " only" : "/RTS"); + cs->ops->set_modem_ctrl(cs, control_state, new_state); + control_state = new_state; + } + + cs->ops->baud_rate(cs, cflag & CBAUD); + + if ((cflag & CBAUD) == B0) { + /* Drop RTS and DTR */ + gig_dbg(DEBUG_IF, "%u: to B0 - drop DTR/RTS", cs->minor_index); + new_state = control_state & ~(TIOCM_DTR | TIOCM_RTS); + cs->ops->set_modem_ctrl(cs, control_state, new_state); + control_state = new_state; + } + + /* + * Update line control register (LCR) + */ + + cs->ops->set_line_ctrl(cs, cflag); + + /* save off the modified port settings */ + cs->control_state = control_state; + +out: + mutex_unlock(&cs->mutex); +} + +static const struct tty_operations if_ops = { + .open = if_open, + .close = if_close, + .ioctl = if_ioctl, + .write = if_write, + .write_room = if_write_room, + .chars_in_buffer = if_chars_in_buffer, + .set_termios = if_set_termios, + .throttle = if_throttle, + .unthrottle = if_unthrottle, + .tiocmget = if_tiocmget, + .tiocmset = if_tiocmset, +}; + + +/* wakeup tasklet for the write operation */ +static void if_wake(unsigned long data) +{ + struct cardstate *cs = (struct cardstate *)data; + + tty_port_tty_wakeup(&cs->port); +} + +/*** interface to common ***/ + +void gigaset_if_init(struct cardstate *cs) +{ + struct gigaset_driver *drv; + + drv = cs->driver; + if (!drv->have_tty) + return; + + tasklet_init(&cs->if_wake_tasklet, if_wake, (unsigned long) cs); + + mutex_lock(&cs->mutex); + cs->tty_dev = tty_port_register_device(&cs->port, drv->tty, + cs->minor_index, NULL); + + if (!IS_ERR(cs->tty_dev)) + dev_set_drvdata(cs->tty_dev, cs); + else { + pr_warning("could not register device to the tty subsystem\n"); + cs->tty_dev = NULL; + } + mutex_unlock(&cs->mutex); +} + +void gigaset_if_free(struct cardstate *cs) +{ + struct gigaset_driver *drv; + + drv = cs->driver; + if (!drv->have_tty) + return; + + tasklet_disable(&cs->if_wake_tasklet); + tasklet_kill(&cs->if_wake_tasklet); + cs->tty_dev = NULL; + tty_unregister_device(drv->tty, cs->minor_index); +} + +/** + * gigaset_if_receive() - pass a received block of data to the tty device + * @cs: device descriptor structure. + * @buffer: received data. + * @len: number of bytes received. + * + * Called by asyncdata/isocdata if a block of data received from the + * device must be sent to userspace through the ttyG* device. + */ +void gigaset_if_receive(struct cardstate *cs, + unsigned char *buffer, size_t len) +{ + tty_insert_flip_string(&cs->port, buffer, len); + tty_flip_buffer_push(&cs->port); +} +EXPORT_SYMBOL_GPL(gigaset_if_receive); + +/* gigaset_if_initdriver + * Initialize tty interface. + * parameters: + * drv Driver + * procname Name of the driver (e.g. for /proc/tty/drivers) + * devname Name of the device files (prefix without minor number) + */ +void gigaset_if_initdriver(struct gigaset_driver *drv, const char *procname, + const char *devname) +{ + int ret; + struct tty_driver *tty; + + drv->have_tty = 0; + + drv->tty = tty = alloc_tty_driver(drv->minors); + if (tty == NULL) + goto enomem; + + tty->type = TTY_DRIVER_TYPE_SERIAL; + tty->subtype = SERIAL_TYPE_NORMAL; + tty->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; + + tty->driver_name = procname; + tty->name = devname; + tty->minor_start = drv->minor; + + tty->init_termios = tty_std_termios; + tty->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; + tty_set_operations(tty, &if_ops); + + ret = tty_register_driver(tty); + if (ret < 0) { + pr_err("error %d registering tty driver\n", ret); + goto error; + } + gig_dbg(DEBUG_IF, "tty driver initialized"); + drv->have_tty = 1; + return; + +enomem: + pr_err("out of memory\n"); +error: + if (drv->tty) + put_tty_driver(drv->tty); +} + +void gigaset_if_freedriver(struct gigaset_driver *drv) +{ + if (!drv->have_tty) + return; + + drv->have_tty = 0; + tty_unregister_driver(drv->tty); + put_tty_driver(drv->tty); +} |