- 根目录:
- drivers
- media
- rc
- ir-rx51.c
/*
* Copyright (C) 2008 Nokia Corporation
*
* Based on lirc_serial.c
*
* 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.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/uaccess.h>
#include <linux/platform_device.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <plat/dmtimer.h>
#include <plat/clock.h>
#include <media/lirc.h>
#include <media/lirc_dev.h>
#include <media/ir-rx51.h>
#define LIRC_RX51_DRIVER_FEATURES (LIRC_CAN_SET_SEND_DUTY_CYCLE | \
LIRC_CAN_SET_SEND_CARRIER | \
LIRC_CAN_SEND_PULSE)
#define DRIVER_NAME "lirc_rx51"
#define WBUF_LEN 256
#define TIMER_MAX_VALUE 0xffffffff
struct lirc_rx51 {
struct omap_dm_timer *pwm_timer;
struct omap_dm_timer *pulse_timer;
struct device *dev;
struct lirc_rx51_platform_data *pdata;
wait_queue_head_t wqueue;
unsigned long fclk_khz;
unsigned int freq; /* carrier frequency */
unsigned int duty_cycle; /* carrier duty cycle */
unsigned int irq_num;
unsigned int match;
int wbuf[WBUF_LEN];
int wbuf_index;
unsigned long device_is_open;
int pwm_timer_num;
};
static void lirc_rx51_on(struct lirc_rx51 *lirc_rx51)
{
omap_dm_timer_set_pwm(lirc_rx51->pwm_timer, 0, 1,
OMAP_TIMER_TRIGGER_OVERFLOW_AND_COMPARE);
}
static void lirc_rx51_off(struct lirc_rx51 *lirc_rx51)
{
omap_dm_timer_set_pwm(lirc_rx51->pwm_timer, 0, 1,
OMAP_TIMER_TRIGGER_NONE);
}
static int init_timing_params(struct lirc_rx51 *lirc_rx51)
{
u32 load, match;
load = -(lirc_rx51->fclk_khz * 1000 / lirc_rx51->freq);
match = -(lirc_rx51->duty_cycle * -load / 100);
omap_dm_timer_set_load(lirc_rx51->pwm_timer, 1, load);
omap_dm_timer_set_match(lirc_rx51->pwm_timer, 1, match);
omap_dm_timer_write_counter(lirc_rx51->pwm_timer, TIMER_MAX_VALUE - 2);
omap_dm_timer_start(lirc_rx51->pwm_timer);
omap_dm_timer_set_int_enable(lirc_rx51->pulse_timer, 0);
omap_dm_timer_start(lirc_rx51->pulse_timer);
lirc_rx51->match = 0;
return 0;
}
#define tics_after(a, b) ((long)(b) - (long)(a) < 0)
static int pulse_timer_set_timeout(struct lirc_rx51 *lirc_rx51, int usec)
{
int counter;
BUG_ON(usec < 0);
if (lirc_rx51->match == 0)
counter = omap_dm_timer_read_counter(lirc_rx51->pulse_timer);
else
counter = lirc_rx51->match;
counter += (u32)(lirc_rx51->fclk_khz * usec / (1000));
omap_dm_timer_set_match(lirc_rx51->pulse_timer, 1, counter);
omap_dm_timer_set_int_enable(lirc_rx51->pulse_timer,
OMAP_TIMER_INT_MATCH);
if (tics_after(omap_dm_timer_read_counter(lirc_rx51->pulse_timer),
counter)) {
return 1;
}
return 0;
}
static irqreturn_t lirc_rx51_interrupt_handler(int irq, void *ptr)
{
unsigned int retval;
struct lirc_rx51 *lirc_rx51 = ptr;
retval = omap_dm_timer_read_status(lirc_rx51->pulse_timer);
if (!retval)
return IRQ_NONE;
if (retval & ~OMAP_TIMER_INT_MATCH)
dev_err_ratelimited(lirc_rx51->dev,
": Unexpected interrupt source: %x\n", retval);
omap_dm_timer_write_status(lirc_rx51->pulse_timer,
OMAP_TIMER_INT_MATCH |
OMAP_TIMER_INT_OVERFLOW |
OMAP_TIMER_INT_CAPTURE);
if (lirc_rx51->wbuf_index < 0) {
dev_err_ratelimited(lirc_rx51->dev,
": BUG wbuf_index has value of %i\n",
lirc_rx51->wbuf_index);
goto end;
}
/*
* If we happen to hit an odd latency spike, loop through the
* pulses until we catch up.
*/
do {
if (lirc_rx51->wbuf_index >= WBUF_LEN)
goto end;
if (lirc_rx51->wbuf[lirc_rx51->wbuf_index] == -1)
goto end;
if (lirc_rx51->wbuf_index % 2)
lirc_rx51_off(lirc_rx51);
else
lirc_rx51_on(lirc_rx51);
retval = pulse_timer_set_timeout(lirc_rx51,
lirc_rx51->wbuf[lirc_rx51->wbuf_index]);
lirc_rx51->wbuf_index++;
} while (retval);
return IRQ_HANDLED;
end:
/* Stop TX here */
lirc_rx51_off(lirc_rx51);
lirc_rx51->wbuf_index = -1;
omap_dm_timer_stop(lirc_rx51->pwm_timer);
omap_dm_timer_stop(lirc_rx51->pulse_timer);
omap_dm_timer_set_int_enable(lirc_rx51->pulse_timer, 0);
wake_up_interruptible(&lirc_rx51->wqueue);
return IRQ_HANDLED;
}
static int lirc_rx51_init_port(struct lirc_rx51 *lirc_rx51)
{
struct clk *clk_fclk;
int retval, pwm_timer = lirc_rx51->pwm_timer_num;
lirc_rx51->pwm_timer = omap_dm_timer_request_specific(pwm_timer);
if (lirc_rx51->pwm_timer == NULL) {
dev_err(lirc_rx51->dev, ": Error requesting GPT%d timer\n",
pwm_timer);
return -EBUSY;
}
lirc_rx51->pulse_timer = omap_dm_timer_request();
if (lirc_rx51->pulse_timer == NULL) {
dev_err(lirc_rx51->dev, ": Error requesting pulse timer\n");
retval = -EBUSY;
goto err1;
}
omap_dm_timer_set_source(lirc_rx51->pwm_timer, OMAP_TIMER_SRC_SYS_CLK);
omap_dm_timer_set_source(lirc_rx51->pulse_timer,
OMAP_TIMER_SRC_SYS_CLK);
omap_dm_timer_enable(lirc_rx51->pwm_timer);
omap_dm_timer_enable(lirc_rx51->pulse_timer);
lirc_rx51->irq_num = omap_dm_timer_get_irq(lirc_rx51->pulse_timer);
retval = request_irq(lirc_rx51->irq_num, lirc_rx51_interrupt_handler,
IRQF_DISABLED | IRQF_SHARED,
"lirc_pulse_timer", lirc_rx51);
if (retval) {
dev_err(lirc_rx51->dev, ": Failed to request interrupt line\n");
goto err2;
}
clk_fclk = omap_dm_timer_get_fclk(lirc_rx51->pwm_timer);
lirc_rx51->fclk_khz = clk_fclk->rate / 1000;
return 0;
err2:
omap_dm_timer_free(lirc_rx51->pulse_timer);
err1:
omap_dm_timer_free(lirc_rx51->pwm_timer);
return retval;
}
static int lirc_rx51_free_port(struct lirc_rx51 *lirc_rx51)
{
omap_dm_timer_set_int_enable(lirc_rx51->pulse_timer, 0);
free_irq(lirc_rx51->irq_num, lirc_rx51);
lirc_rx51_off(lirc_rx51);
omap_dm_timer_disable(lirc_rx51->pwm_timer);
omap_dm_timer_disable(lirc_rx51->pulse_timer);
omap_dm_timer_free(lirc_rx51->pwm_timer);
omap_dm_timer_free(lirc_rx51->pulse_timer);
lirc_rx51->wbuf_index = -1;
return 0;
}
static ssize_t lirc_rx51_write(struct file *file, const char *buf,
size_t n, loff_t *ppos)
{
int count, i;
struct lirc_rx51 *lirc_rx51 = file->private_data;
if (n % sizeof(int))
return -EINVAL;
count = n / sizeof(int);
if ((count > WBUF_LEN) || (count % 2 == 0))
return -EINVAL;
/* Wait any pending transfers to finish */
wait_event_interruptible(lirc_rx51->wqueue, lirc_rx51->wbuf_index < 0);
if (copy_from_user(lirc_rx51->wbuf, buf, n))
return -EFAULT;
/* Sanity check the input pulses */
for (i = 0; i < count; i++)
if (lirc_rx51->wbuf[i] < 0)
return -EINVAL;
init_timing_params(lirc_rx51);
if (count < WBUF_LEN)
lirc_rx51->wbuf[count] = -1; /* Insert termination mark */
/*
* Adjust latency requirements so the device doesn't go in too
* deep sleep states
*/
lirc_rx51->pdata->set_max_mpu_wakeup_lat(lirc_rx51->dev, 50);
lirc_rx51_on(lirc_rx51);
lirc_rx51->wbuf_index = 1;
pulse_timer_set_timeout(lirc_rx51, lirc_rx51->wbuf[0]);
/*
* Don't return back to the userspace until the transfer has
* finished
*/
wait_event_interruptible(lirc_rx51->wqueue, lirc_rx51->wbuf_index < 0);
/* We can sleep again */
lirc_rx51->pdata->set_max_mpu_wakeup_lat(lirc_rx51->dev, -1);
return n;
}
static long lirc_rx51_ioctl(struct file *filep,
unsigned int cmd, unsigned long arg)
{
int result;
unsigned long value;
unsigned int ivalue;
struct lirc_rx51 *lirc_rx51 = filep->private_data;
switch (cmd) {
case LIRC_GET_SEND_MODE:
result = put_user(LIRC_MODE_PULSE, (unsigned long *)arg);
if (result)
return result;
break;
case LIRC_SET_SEND_MODE:
result = get_user(value, (unsigned long *)arg);
if (result)
return result;
/* only LIRC_MODE_PULSE supported */
if (value != LIRC_MODE_PULSE)
return -ENOSYS;
break;
case LIRC_GET_REC_MODE:
result = put_user(0, (unsigned long *) arg);
if (result)
return result;
break;
case LIRC_GET_LENGTH:
return -ENOSYS;
break;
case LIRC_SET_SEND_DUTY_CYCLE:
result = get_user(ivalue, (unsigned int *) arg);
if (result)
return result;
if (ivalue <= 0 || ivalue > 100) {
dev_err(lirc_rx51->dev, ": invalid duty cycle %d\n",
ivalue);
return -EINVAL;
}
lirc_rx51->duty_cycle = ivalue;
break;
case LIRC_SET_SEND_CARRIER:
result = get_user(ivalue, (unsigned int *) arg);
if (result)
return result;
if (ivalue > 500000 || ivalue < 20000) {
dev_err(lirc_rx51->dev, ": invalid carrier freq %d\n",
ivalue);
return -EINVAL;
}
lirc_rx51->freq = ivalue;
break;
case LIRC_GET_FEATURES:
result = put_user(LIRC_RX51_DRIVER_FEATURES,
(unsigned long *) arg);
if (result)
return result;
break;
default:
return -ENOIOCTLCMD;
}
return 0;
}
static int lirc_rx51_open(struct inode *inode, struct file *file)
{
struct lirc_rx51 *lirc_rx51 = lirc_get_pdata(file);
BUG_ON(!lirc_rx51);
file->private_data = lirc_rx51;
if (test_and_set_bit(1, &lirc_rx51->device_is_open))
return -EBUSY;
return lirc_rx51_init_port(lirc_rx51);
}
static int lirc_rx51_release(struct inode *inode, struct file *file)
{
struct lirc_rx51 *lirc_rx51 = file->private_data;
lirc_rx51_free_port(lirc_rx51);
clear_bit(1, &lirc_rx51->device_is_open);
return 0;
}
static struct lirc_rx51 lirc_rx51 = {
.freq = 38000,
.duty_cycle = 50,
.wbuf_index = -1,
};
static const struct file_operations lirc_fops = {
.owner = THIS_MODULE,
.write = lirc_rx51_write,
.unlocked_ioctl = lirc_rx51_ioctl,
.read = lirc_dev_fop_read,
.poll = lirc_dev_fop_poll,
.open = lirc_rx51_open,
.release = lirc_rx51_release,
};
static struct lirc_driver lirc_rx51_driver = {
.name = DRIVER_NAME,
.minor = -1,
.code_length = 1,
.data = &lirc_rx51,
.fops = &lirc_fops,
.owner = THIS_MODULE,
};
#ifdef CONFIG_PM
static int lirc_rx51_suspend(struct platform_device *dev, pm_message_t state)
{
/*
* In case the device is still open, do not suspend. Normally
* this should not be a problem as lircd only keeps the device
* open only for short periods of time. We also don't want to
* get involved with race conditions that might happen if we
* were in a middle of a transmit. Thus, we defer any suspend
* actions until transmit has completed.
*/
if (test_and_set_bit(1, &lirc_rx51.device_is_open))
return -EAGAIN;
clear_bit(1, &lirc_rx51.device_is_open);
return 0;
}
static int lirc_rx51_resume(struct platform_device *dev)
{
return 0;
}
#else
#define lirc_rx51_suspend NULL
#define lirc_rx51_resume NULL
#endif /* CONFIG_PM */
static int lirc_rx51_probe(struct platform_device *dev)
{
lirc_rx51_driver.features = LIRC_RX51_DRIVER_FEATURES;
lirc_rx51.pdata = dev->dev.platform_data;
lirc_rx51.pwm_timer_num = lirc_rx51.pdata->pwm_timer;
lirc_rx51.dev = &dev->dev;
lirc_rx51_driver.dev = &dev->dev;
lirc_rx51_driver.minor = lirc_register_driver(&lirc_rx51_driver);
init_waitqueue_head(&lirc_rx51.wqueue);
if (lirc_rx51_driver.minor < 0) {
dev_err(lirc_rx51.dev, ": lirc_register_driver failed: %d\n",
lirc_rx51_driver.minor);
return lirc_rx51_driver.minor;
}
dev_info(lirc_rx51.dev, "registration ok, minor: %d, pwm: %d\n",
lirc_rx51_driver.minor, lirc_rx51.pwm_timer_num);
return 0;
}
static int lirc_rx51_remove(struct platform_device *dev)
{
return lirc_unregister_driver(lirc_rx51_driver.minor);
}
struct platform_driver lirc_rx51_platform_driver = {
.probe = lirc_rx51_probe,
.remove = lirc_rx51_remove,
.suspend = lirc_rx51_suspend,
.resume = lirc_rx51_resume,
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
},
};
module_platform_driver(lirc_rx51_platform_driver);
MODULE_DESCRIPTION("LIRC TX driver for Nokia RX51");
MODULE_AUTHOR("Nokia Corporation");
MODULE_LICENSE("GPL");