297 строки
6.4 KiB
C
297 строки
6.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Copyright (C) 2008 Nokia Corporation
|
|
*
|
|
* Based on lirc_serial.c
|
|
*/
|
|
#include <linux/clk.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/wait.h>
|
|
#include <linux/pwm.h>
|
|
#include <linux/of.h>
|
|
#include <linux/hrtimer.h>
|
|
|
|
#include <media/rc-core.h>
|
|
|
|
#define WBUF_LEN 256
|
|
|
|
struct ir_rx51 {
|
|
struct rc_dev *rcdev;
|
|
struct pwm_device *pwm;
|
|
struct hrtimer timer;
|
|
struct device *dev;
|
|
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 ir_rx51_on(struct ir_rx51 *ir_rx51)
|
|
{
|
|
pwm_enable(ir_rx51->pwm);
|
|
}
|
|
|
|
static inline void ir_rx51_off(struct ir_rx51 *ir_rx51)
|
|
{
|
|
pwm_disable(ir_rx51->pwm);
|
|
}
|
|
|
|
static int init_timing_params(struct ir_rx51 *ir_rx51)
|
|
{
|
|
struct pwm_device *pwm = ir_rx51->pwm;
|
|
int duty, period = DIV_ROUND_CLOSEST(NSEC_PER_SEC, ir_rx51->freq);
|
|
|
|
duty = DIV_ROUND_CLOSEST(ir_rx51->duty_cycle * period, 100);
|
|
|
|
pwm_config(pwm, duty, period);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static enum hrtimer_restart ir_rx51_timer_cb(struct hrtimer *timer)
|
|
{
|
|
struct ir_rx51 *ir_rx51 = container_of(timer, struct ir_rx51, timer);
|
|
ktime_t now;
|
|
|
|
if (ir_rx51->wbuf_index < 0) {
|
|
dev_err_ratelimited(ir_rx51->dev,
|
|
"BUG wbuf_index has value of %i\n",
|
|
ir_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 (ir_rx51->wbuf_index >= WBUF_LEN)
|
|
goto end;
|
|
if (ir_rx51->wbuf[ir_rx51->wbuf_index] == -1)
|
|
goto end;
|
|
|
|
if (ir_rx51->wbuf_index % 2)
|
|
ir_rx51_off(ir_rx51);
|
|
else
|
|
ir_rx51_on(ir_rx51);
|
|
|
|
ns = US_TO_NS(ir_rx51->wbuf[ir_rx51->wbuf_index]);
|
|
hrtimer_add_expires_ns(timer, ns);
|
|
|
|
ir_rx51->wbuf_index++;
|
|
|
|
now = timer->base->get_time();
|
|
|
|
} while (hrtimer_get_expires_tv64(timer) < now);
|
|
|
|
return HRTIMER_RESTART;
|
|
end:
|
|
/* Stop TX here */
|
|
ir_rx51_off(ir_rx51);
|
|
ir_rx51->wbuf_index = -1;
|
|
|
|
wake_up_interruptible(&ir_rx51->wqueue);
|
|
|
|
return HRTIMER_NORESTART;
|
|
}
|
|
|
|
static int ir_rx51_tx(struct rc_dev *dev, unsigned int *buffer,
|
|
unsigned int count)
|
|
{
|
|
struct ir_rx51 *ir_rx51 = dev->priv;
|
|
|
|
if (count > WBUF_LEN)
|
|
return -EINVAL;
|
|
|
|
memcpy(ir_rx51->wbuf, buffer, count * sizeof(unsigned int));
|
|
|
|
/* Wait any pending transfers to finish */
|
|
wait_event_interruptible(ir_rx51->wqueue, ir_rx51->wbuf_index < 0);
|
|
|
|
init_timing_params(ir_rx51);
|
|
if (count < WBUF_LEN)
|
|
ir_rx51->wbuf[count] = -1; /* Insert termination mark */
|
|
|
|
/*
|
|
* REVISIT: Adjust latency requirements so the device doesn't go in too
|
|
* deep sleep states with pm_qos_add_request().
|
|
*/
|
|
|
|
ir_rx51_on(ir_rx51);
|
|
ir_rx51->wbuf_index = 1;
|
|
hrtimer_start(&ir_rx51->timer,
|
|
ns_to_ktime(US_TO_NS(ir_rx51->wbuf[0])),
|
|
HRTIMER_MODE_REL);
|
|
/*
|
|
* Don't return back to the userspace until the transfer has
|
|
* finished
|
|
*/
|
|
wait_event_interruptible(ir_rx51->wqueue, ir_rx51->wbuf_index < 0);
|
|
|
|
/* REVISIT: Remove pm_qos constraint, we can sleep again */
|
|
|
|
return count;
|
|
}
|
|
|
|
static int ir_rx51_open(struct rc_dev *dev)
|
|
{
|
|
struct ir_rx51 *ir_rx51 = dev->priv;
|
|
|
|
if (test_and_set_bit(1, &ir_rx51->device_is_open))
|
|
return -EBUSY;
|
|
|
|
ir_rx51->pwm = pwm_get(ir_rx51->dev, NULL);
|
|
if (IS_ERR(ir_rx51->pwm)) {
|
|
int res = PTR_ERR(ir_rx51->pwm);
|
|
|
|
dev_err(ir_rx51->dev, "pwm_get failed: %d\n", res);
|
|
return res;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ir_rx51_release(struct rc_dev *dev)
|
|
{
|
|
struct ir_rx51 *ir_rx51 = dev->priv;
|
|
|
|
hrtimer_cancel(&ir_rx51->timer);
|
|
ir_rx51_off(ir_rx51);
|
|
pwm_put(ir_rx51->pwm);
|
|
|
|
clear_bit(1, &ir_rx51->device_is_open);
|
|
}
|
|
|
|
static struct ir_rx51 ir_rx51 = {
|
|
.duty_cycle = 50,
|
|
.wbuf_index = -1,
|
|
};
|
|
|
|
static int ir_rx51_set_duty_cycle(struct rc_dev *dev, u32 duty)
|
|
{
|
|
struct ir_rx51 *ir_rx51 = dev->priv;
|
|
|
|
ir_rx51->duty_cycle = duty;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ir_rx51_set_tx_carrier(struct rc_dev *dev, u32 carrier)
|
|
{
|
|
struct ir_rx51 *ir_rx51 = dev->priv;
|
|
|
|
if (carrier > 500000 || carrier < 20000)
|
|
return -EINVAL;
|
|
|
|
ir_rx51->freq = carrier;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
|
|
static int ir_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, &ir_rx51.device_is_open))
|
|
return -EAGAIN;
|
|
|
|
clear_bit(1, &ir_rx51.device_is_open);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ir_rx51_resume(struct platform_device *dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#else
|
|
|
|
#define ir_rx51_suspend NULL
|
|
#define ir_rx51_resume NULL
|
|
|
|
#endif /* CONFIG_PM */
|
|
|
|
static int ir_rx51_probe(struct platform_device *dev)
|
|
{
|
|
struct pwm_device *pwm;
|
|
struct rc_dev *rcdev;
|
|
|
|
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 */
|
|
ir_rx51.freq = DIV_ROUND_CLOSEST_ULL(pwm_get_period(pwm), NSEC_PER_SEC);
|
|
pwm_put(pwm);
|
|
|
|
hrtimer_init(&ir_rx51.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
|
|
ir_rx51.timer.function = ir_rx51_timer_cb;
|
|
|
|
ir_rx51.dev = &dev->dev;
|
|
|
|
rcdev = devm_rc_allocate_device(&dev->dev, RC_DRIVER_IR_RAW_TX);
|
|
if (!rcdev)
|
|
return -ENOMEM;
|
|
|
|
rcdev->priv = &ir_rx51;
|
|
rcdev->open = ir_rx51_open;
|
|
rcdev->close = ir_rx51_release;
|
|
rcdev->tx_ir = ir_rx51_tx;
|
|
rcdev->s_tx_duty_cycle = ir_rx51_set_duty_cycle;
|
|
rcdev->s_tx_carrier = ir_rx51_set_tx_carrier;
|
|
rcdev->driver_name = KBUILD_MODNAME;
|
|
|
|
ir_rx51.rcdev = rcdev;
|
|
|
|
return devm_rc_register_device(&dev->dev, ir_rx51.rcdev);
|
|
}
|
|
|
|
static int ir_rx51_remove(struct platform_device *dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id ir_rx51_match[] = {
|
|
{
|
|
.compatible = "nokia,n900-ir",
|
|
},
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, ir_rx51_match);
|
|
|
|
static struct platform_driver ir_rx51_platform_driver = {
|
|
.probe = ir_rx51_probe,
|
|
.remove = ir_rx51_remove,
|
|
.suspend = ir_rx51_suspend,
|
|
.resume = ir_rx51_resume,
|
|
.driver = {
|
|
.name = KBUILD_MODNAME,
|
|
.of_match_table = of_match_ptr(ir_rx51_match),
|
|
},
|
|
};
|
|
module_platform_driver(ir_rx51_platform_driver);
|
|
|
|
MODULE_DESCRIPTION("IR TX driver for Nokia RX51");
|
|
MODULE_AUTHOR("Nokia Corporation");
|
|
MODULE_LICENSE("GPL");
|