linux/drivers/media/rc/ir-rx51.c
Thomas Gleixner c942fddf87 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157
Based on 3 normalized pattern(s):

  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

  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 [author] [kishon] [vijay] [abraham]
  [i] [kishon]@[ti] [com] 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

  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 [author] [graeme] [gregory]
  [gg]@[slimlogic] [co] [uk] [author] [kishon] [vijay] [abraham] [i]
  [kishon]@[ti] [com] [based] [on] [twl6030]_[usb] [c] [author] [hema]
  [hk] [hemahk]@[ti] [com] 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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1105 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.202006027@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:37 -07:00

297 lines
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(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");