linux/drivers/media/rc/ir-rx51.c
Ivaylo Dimitrov 79cdad3635 ir-rx51: use hrtimer instead of dmtimer
Drop dmtimer usage for pulse timer in favor of hrtimer. That allows
removing PWM dmitimer platform data usage.

Signed-off-by: Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com>
Acked-by: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
2016-06-29 21:54:35 -07:00

413 lines
9.3 KiB
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.
*/
#include <linux/clk.h>
#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 <linux/pwm.h>
#include <linux/of.h>
#include <linux/hrtimer.h>
#include <media/lirc.h>
#include <media/lirc_dev.h>
#include <linux/platform_data/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
struct lirc_rx51 {
struct pwm_device *pwm;
struct hrtimer timer;
struct device *dev;
struct lirc_rx51_platform_data *pdata;
wait_queue_head_t wqueue;
unsigned int freq; /* carrier frequency */
unsigned int duty_cycle; /* carrier duty cycle */
int wbuf[WBUF_LEN];
int wbuf_index;
unsigned long device_is_open;
};
static inline void lirc_rx51_on(struct lirc_rx51 *lirc_rx51)
{
pwm_enable(lirc_rx51->pwm);
}
static inline void lirc_rx51_off(struct lirc_rx51 *lirc_rx51)
{
pwm_disable(lirc_rx51->pwm);
}
static int init_timing_params(struct lirc_rx51 *lirc_rx51)
{
struct pwm_device *pwm = lirc_rx51->pwm;
int duty, period = DIV_ROUND_CLOSEST(NSEC_PER_SEC, lirc_rx51->freq);
duty = DIV_ROUND_CLOSEST(lirc_rx51->duty_cycle * period, 100);
pwm_config(pwm, duty, period);
return 0;
}
static enum hrtimer_restart lirc_rx51_timer_cb(struct hrtimer *timer)
{
struct lirc_rx51 *lirc_rx51 =
container_of(timer, struct lirc_rx51, timer);
ktime_t now;
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 {
u64 ns;
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);
ns = 1000 * lirc_rx51->wbuf[lirc_rx51->wbuf_index];
hrtimer_add_expires_ns(timer, ns);
lirc_rx51->wbuf_index++;
now = timer->base->get_time();
} while (hrtimer_get_expires_tv64(timer) < now.tv64);
return HRTIMER_RESTART;
end:
/* Stop TX here */
lirc_rx51_off(lirc_rx51);
lirc_rx51->wbuf_index = -1;
wake_up_interruptible(&lirc_rx51->wqueue);
return HRTIMER_NORESTART;
}
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;
hrtimer_start(&lirc_rx51->timer,
ns_to_ktime(1000 * lirc_rx51->wbuf[0]),
HRTIMER_MODE_REL);
/*
* 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;
lirc_rx51->pwm = pwm_get(lirc_rx51->dev, NULL);
if (IS_ERR(lirc_rx51->pwm)) {
int res = PTR_ERR(lirc_rx51->pwm);
dev_err(lirc_rx51->dev, "pwm_get failed: %d\n", res);
return res;
}
return 0;
}
static int lirc_rx51_release(struct inode *inode, struct file *file)
{
struct lirc_rx51 *lirc_rx51 = file->private_data;
hrtimer_cancel(&lirc_rx51->timer);
lirc_rx51_off(lirc_rx51);
pwm_put(lirc_rx51->pwm);
clear_bit(1, &lirc_rx51->device_is_open);
return 0;
}
static struct lirc_rx51 lirc_rx51 = {
.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)
{
struct pwm_device *pwm;
lirc_rx51_driver.features = LIRC_RX51_DRIVER_FEATURES;
lirc_rx51.pdata = dev->dev.platform_data;
if (!lirc_rx51.pdata) {
dev_err(&dev->dev, "Platform Data is missing\n");
return -ENXIO;
}
pwm = pwm_get(&dev->dev, NULL);
if (IS_ERR(pwm)) {
int err = PTR_ERR(pwm);
if (err != -EPROBE_DEFER)
dev_err(&dev->dev, "pwm_get failed: %d\n", err);
return err;
}
/* Use default, in case userspace does not set the carrier */
lirc_rx51.freq = DIV_ROUND_CLOSEST(pwm_get_period(pwm), NSEC_PER_SEC);
pwm_put(pwm);
hrtimer_init(&lirc_rx51.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
lirc_rx51.timer.function = lirc_rx51_timer_cb;
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;
}
return 0;
}
static int lirc_rx51_remove(struct platform_device *dev)
{
return lirc_unregister_driver(lirc_rx51_driver.minor);
}
static const struct of_device_id lirc_rx51_match[] = {
{
.compatible = "nokia,n900-ir",
},
{},
};
MODULE_DEVICE_TABLE(of, lirc_rx51_match);
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,
.of_match_table = of_match_ptr(lirc_rx51_match),
},
};
module_platform_driver(lirc_rx51_platform_driver);
MODULE_DESCRIPTION("LIRC TX driver for Nokia RX51");
MODULE_AUTHOR("Nokia Corporation");
MODULE_LICENSE("GPL");