mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-28 20:02:17 +00:00
![Jovi Zhang](/assets/img/avatar_default.png)
remove invalid location line in each file header after location moved from driver/char to driver/tty Signed-off-by: Jovi Zhang <bookjovi@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
235 lines
5.5 KiB
C
235 lines
5.5 KiB
C
/*
|
|
* Copyright (C) 2007 Google, Inc.
|
|
* Copyright (c) 2011, Code Aurora Forum. All rights reserved.
|
|
* Author: Brian Swetland <swetland@google.com>
|
|
*
|
|
* This software is licensed under the terms of the GNU General Public
|
|
* License version 2, as published by the Free Software Foundation, and
|
|
* may be copied, distributed, and modified under those terms.
|
|
*
|
|
* 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.
|
|
*
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/cdev.h>
|
|
#include <linux/device.h>
|
|
#include <linux/wait.h>
|
|
|
|
#include <linux/tty.h>
|
|
#include <linux/tty_driver.h>
|
|
#include <linux/tty_flip.h>
|
|
|
|
#include <mach/msm_smd.h>
|
|
|
|
#define MAX_SMD_TTYS 32
|
|
|
|
struct smd_tty_info {
|
|
struct tty_port port;
|
|
smd_channel_t *ch;
|
|
};
|
|
|
|
struct smd_tty_channel_desc {
|
|
int id;
|
|
const char *name;
|
|
};
|
|
|
|
static struct smd_tty_info smd_tty[MAX_SMD_TTYS];
|
|
|
|
static const struct smd_tty_channel_desc smd_default_tty_channels[] = {
|
|
{ .id = 0, .name = "SMD_DS" },
|
|
{ .id = 27, .name = "SMD_GPSNMEA" },
|
|
};
|
|
|
|
static const struct smd_tty_channel_desc *smd_tty_channels =
|
|
smd_default_tty_channels;
|
|
static int smd_tty_channels_len = ARRAY_SIZE(smd_default_tty_channels);
|
|
|
|
static void smd_tty_notify(void *priv, unsigned event)
|
|
{
|
|
unsigned char *ptr;
|
|
int avail;
|
|
struct smd_tty_info *info = priv;
|
|
struct tty_struct *tty;
|
|
|
|
if (event != SMD_EVENT_DATA)
|
|
return;
|
|
|
|
tty = tty_port_tty_get(&info->port);
|
|
if (!tty)
|
|
return;
|
|
|
|
for (;;) {
|
|
if (test_bit(TTY_THROTTLED, &tty->flags))
|
|
break;
|
|
avail = smd_read_avail(info->ch);
|
|
if (avail == 0)
|
|
break;
|
|
|
|
avail = tty_prepare_flip_string(tty, &ptr, avail);
|
|
|
|
if (smd_read(info->ch, ptr, avail) != avail) {
|
|
/* shouldn't be possible since we're in interrupt
|
|
** context here and nobody else could 'steal' our
|
|
** characters.
|
|
*/
|
|
pr_err("OOPS - smd_tty_buffer mismatch?!");
|
|
}
|
|
|
|
tty_flip_buffer_push(tty);
|
|
}
|
|
|
|
/* XXX only when writable and necessary */
|
|
tty_wakeup(tty);
|
|
tty_kref_put(tty);
|
|
}
|
|
|
|
static int smd_tty_port_activate(struct tty_port *tport, struct tty_struct *tty)
|
|
{
|
|
int i, res = 0;
|
|
int n = tty->index;
|
|
const char *name = NULL;
|
|
struct smd_tty_info *info = smd_tty + n;
|
|
|
|
for (i = 0; i < smd_tty_channels_len; i++) {
|
|
if (smd_tty_channels[i].id == n) {
|
|
name = smd_tty_channels[i].name;
|
|
break;
|
|
}
|
|
}
|
|
if (!name)
|
|
return -ENODEV;
|
|
|
|
if (info->ch)
|
|
smd_kick(info->ch);
|
|
else
|
|
res = smd_open(name, &info->ch, info, smd_tty_notify);
|
|
|
|
if (!res)
|
|
tty->driver_data = info;
|
|
|
|
return res;
|
|
}
|
|
|
|
static void smd_tty_port_shutdown(struct tty_port *tport)
|
|
{
|
|
struct smd_tty_info *info;
|
|
struct tty_struct *tty = tty_port_tty_get(tport);
|
|
|
|
info = tty->driver_data;
|
|
if (info->ch) {
|
|
smd_close(info->ch);
|
|
info->ch = 0;
|
|
}
|
|
|
|
tty->driver_data = 0;
|
|
tty_kref_put(tty);
|
|
}
|
|
|
|
static int smd_tty_open(struct tty_struct *tty, struct file *f)
|
|
{
|
|
struct smd_tty_info *info = smd_tty + tty->index;
|
|
|
|
return tty_port_open(&info->port, tty, f);
|
|
}
|
|
|
|
static void smd_tty_close(struct tty_struct *tty, struct file *f)
|
|
{
|
|
struct smd_tty_info *info = tty->driver_data;
|
|
|
|
tty_port_close(&info->port, tty, f);
|
|
}
|
|
|
|
static int smd_tty_write(struct tty_struct *tty,
|
|
const unsigned char *buf, int len)
|
|
{
|
|
struct smd_tty_info *info = tty->driver_data;
|
|
int avail;
|
|
|
|
/* if we're writing to a packet channel we will
|
|
** never be able to write more data than there
|
|
** is currently space for
|
|
*/
|
|
avail = smd_write_avail(info->ch);
|
|
if (len > avail)
|
|
len = avail;
|
|
|
|
return smd_write(info->ch, buf, len);
|
|
}
|
|
|
|
static int smd_tty_write_room(struct tty_struct *tty)
|
|
{
|
|
struct smd_tty_info *info = tty->driver_data;
|
|
return smd_write_avail(info->ch);
|
|
}
|
|
|
|
static int smd_tty_chars_in_buffer(struct tty_struct *tty)
|
|
{
|
|
struct smd_tty_info *info = tty->driver_data;
|
|
return smd_read_avail(info->ch);
|
|
}
|
|
|
|
static void smd_tty_unthrottle(struct tty_struct *tty)
|
|
{
|
|
struct smd_tty_info *info = tty->driver_data;
|
|
smd_kick(info->ch);
|
|
}
|
|
|
|
static const struct tty_port_operations smd_tty_port_ops = {
|
|
.shutdown = smd_tty_port_shutdown,
|
|
.activate = smd_tty_port_activate,
|
|
};
|
|
|
|
static const struct tty_operations smd_tty_ops = {
|
|
.open = smd_tty_open,
|
|
.close = smd_tty_close,
|
|
.write = smd_tty_write,
|
|
.write_room = smd_tty_write_room,
|
|
.chars_in_buffer = smd_tty_chars_in_buffer,
|
|
.unthrottle = smd_tty_unthrottle,
|
|
};
|
|
|
|
static struct tty_driver *smd_tty_driver;
|
|
|
|
static int __init smd_tty_init(void)
|
|
{
|
|
int ret, i;
|
|
|
|
smd_tty_driver = alloc_tty_driver(MAX_SMD_TTYS);
|
|
if (smd_tty_driver == 0)
|
|
return -ENOMEM;
|
|
|
|
smd_tty_driver->owner = THIS_MODULE;
|
|
smd_tty_driver->driver_name = "smd_tty_driver";
|
|
smd_tty_driver->name = "smd";
|
|
smd_tty_driver->major = 0;
|
|
smd_tty_driver->minor_start = 0;
|
|
smd_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
|
|
smd_tty_driver->subtype = SERIAL_TYPE_NORMAL;
|
|
smd_tty_driver->init_termios = tty_std_termios;
|
|
smd_tty_driver->init_termios.c_iflag = 0;
|
|
smd_tty_driver->init_termios.c_oflag = 0;
|
|
smd_tty_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
|
|
smd_tty_driver->init_termios.c_lflag = 0;
|
|
smd_tty_driver->flags = TTY_DRIVER_RESET_TERMIOS |
|
|
TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
|
|
tty_set_operations(smd_tty_driver, &smd_tty_ops);
|
|
|
|
ret = tty_register_driver(smd_tty_driver);
|
|
if (ret)
|
|
return ret;
|
|
|
|
for (i = 0; i < smd_tty_channels_len; i++) {
|
|
tty_port_init(&smd_tty[smd_tty_channels[i].id].port);
|
|
smd_tty[smd_tty_channels[i].id].port.ops = &smd_tty_port_ops;
|
|
tty_register_device(smd_tty_driver, smd_tty_channels[i].id, 0);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
module_init(smd_tty_init);
|