297 lines
6.5 KiB
C
297 lines
6.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2008 Nokia Corporation
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*
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* Based on lirc_serial.c
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*/
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#include <linux/clk.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/wait.h>
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#include <linux/pwm.h>
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#include <linux/of.h>
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#include <linux/hrtimer.h>
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#include <media/rc-core.h>
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#define WBUF_LEN 256
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struct ir_rx51 {
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struct rc_dev *rcdev;
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struct pwm_device *pwm;
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struct pwm_state state;
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struct hrtimer timer;
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struct device *dev;
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wait_queue_head_t wqueue;
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unsigned int freq; /* carrier frequency */
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unsigned int duty_cycle; /* carrier duty cycle */
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int wbuf[WBUF_LEN];
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int wbuf_index;
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unsigned long device_is_open;
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};
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static inline void ir_rx51_on(struct ir_rx51 *ir_rx51)
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{
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ir_rx51->state.enabled = true;
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pwm_apply_state(ir_rx51->pwm, &ir_rx51->state);
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}
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static inline void ir_rx51_off(struct ir_rx51 *ir_rx51)
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{
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ir_rx51->state.enabled = false;
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pwm_apply_state(ir_rx51->pwm, &ir_rx51->state);
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}
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static int init_timing_params(struct ir_rx51 *ir_rx51)
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{
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ir_rx51->state.period = DIV_ROUND_CLOSEST(NSEC_PER_SEC, ir_rx51->freq);
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pwm_set_relative_duty_cycle(&ir_rx51->state, ir_rx51->duty_cycle, 100);
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return 0;
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}
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static enum hrtimer_restart ir_rx51_timer_cb(struct hrtimer *timer)
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{
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struct ir_rx51 *ir_rx51 = container_of(timer, struct ir_rx51, timer);
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ktime_t now;
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if (ir_rx51->wbuf_index < 0) {
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dev_err_ratelimited(ir_rx51->dev,
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"BUG wbuf_index has value of %i\n",
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ir_rx51->wbuf_index);
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goto end;
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}
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/*
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* If we happen to hit an odd latency spike, loop through the
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* pulses until we catch up.
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*/
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do {
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u64 ns;
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if (ir_rx51->wbuf_index >= WBUF_LEN)
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goto end;
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if (ir_rx51->wbuf[ir_rx51->wbuf_index] == -1)
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goto end;
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if (ir_rx51->wbuf_index % 2)
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ir_rx51_off(ir_rx51);
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else
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ir_rx51_on(ir_rx51);
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ns = US_TO_NS(ir_rx51->wbuf[ir_rx51->wbuf_index]);
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hrtimer_add_expires_ns(timer, ns);
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ir_rx51->wbuf_index++;
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now = timer->base->get_time();
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} while (hrtimer_get_expires_tv64(timer) < now);
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return HRTIMER_RESTART;
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end:
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/* Stop TX here */
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ir_rx51_off(ir_rx51);
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ir_rx51->wbuf_index = -1;
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wake_up_interruptible(&ir_rx51->wqueue);
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return HRTIMER_NORESTART;
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}
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static int ir_rx51_tx(struct rc_dev *dev, unsigned int *buffer,
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unsigned int count)
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{
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struct ir_rx51 *ir_rx51 = dev->priv;
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if (count > WBUF_LEN)
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return -EINVAL;
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memcpy(ir_rx51->wbuf, buffer, count * sizeof(unsigned int));
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/* Wait any pending transfers to finish */
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wait_event_interruptible(ir_rx51->wqueue, ir_rx51->wbuf_index < 0);
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init_timing_params(ir_rx51);
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if (count < WBUF_LEN)
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ir_rx51->wbuf[count] = -1; /* Insert termination mark */
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/*
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* REVISIT: Adjust latency requirements so the device doesn't go in too
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* deep sleep states with pm_qos_add_request().
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*/
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ir_rx51_on(ir_rx51);
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ir_rx51->wbuf_index = 1;
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hrtimer_start(&ir_rx51->timer,
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ns_to_ktime(US_TO_NS(ir_rx51->wbuf[0])),
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HRTIMER_MODE_REL);
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/*
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* Don't return back to the userspace until the transfer has
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* finished
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*/
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wait_event_interruptible(ir_rx51->wqueue, ir_rx51->wbuf_index < 0);
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/* REVISIT: Remove pm_qos constraint, we can sleep again */
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return count;
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}
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static int ir_rx51_open(struct rc_dev *dev)
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{
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struct ir_rx51 *ir_rx51 = dev->priv;
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if (test_and_set_bit(1, &ir_rx51->device_is_open))
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return -EBUSY;
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ir_rx51->pwm = pwm_get(ir_rx51->dev, NULL);
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if (IS_ERR(ir_rx51->pwm)) {
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int res = PTR_ERR(ir_rx51->pwm);
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dev_err(ir_rx51->dev, "pwm_get failed: %d\n", res);
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return res;
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}
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return 0;
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}
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static void ir_rx51_release(struct rc_dev *dev)
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{
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struct ir_rx51 *ir_rx51 = dev->priv;
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hrtimer_cancel(&ir_rx51->timer);
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ir_rx51_off(ir_rx51);
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pwm_put(ir_rx51->pwm);
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clear_bit(1, &ir_rx51->device_is_open);
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}
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static struct ir_rx51 ir_rx51 = {
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.duty_cycle = 50,
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.wbuf_index = -1,
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};
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static int ir_rx51_set_duty_cycle(struct rc_dev *dev, u32 duty)
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{
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struct ir_rx51 *ir_rx51 = dev->priv;
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ir_rx51->duty_cycle = duty;
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return 0;
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}
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static int ir_rx51_set_tx_carrier(struct rc_dev *dev, u32 carrier)
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{
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struct ir_rx51 *ir_rx51 = dev->priv;
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if (carrier > 500000 || carrier < 20000)
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return -EINVAL;
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ir_rx51->freq = carrier;
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return 0;
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}
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#ifdef CONFIG_PM
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static int ir_rx51_suspend(struct platform_device *dev, pm_message_t state)
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{
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/*
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* In case the device is still open, do not suspend. Normally
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* this should not be a problem as lircd only keeps the device
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* open only for short periods of time. We also don't want to
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* get involved with race conditions that might happen if we
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* were in a middle of a transmit. Thus, we defer any suspend
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* actions until transmit has completed.
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*/
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if (test_and_set_bit(1, &ir_rx51.device_is_open))
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return -EAGAIN;
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clear_bit(1, &ir_rx51.device_is_open);
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return 0;
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}
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static int ir_rx51_resume(struct platform_device *dev)
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{
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return 0;
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}
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#else
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#define ir_rx51_suspend NULL
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#define ir_rx51_resume NULL
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#endif /* CONFIG_PM */
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static int ir_rx51_probe(struct platform_device *dev)
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{
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struct pwm_device *pwm;
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struct rc_dev *rcdev;
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pwm = pwm_get(&dev->dev, NULL);
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if (IS_ERR(pwm)) {
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int err = PTR_ERR(pwm);
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if (err != -EPROBE_DEFER)
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dev_err(&dev->dev, "pwm_get failed: %d\n", err);
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return err;
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}
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/* Use default, in case userspace does not set the carrier */
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ir_rx51.freq = DIV_ROUND_CLOSEST_ULL(pwm_get_period(pwm), NSEC_PER_SEC);
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pwm_init_state(pwm, &ir_rx51.state);
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pwm_put(pwm);
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hrtimer_init(&ir_rx51.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
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ir_rx51.timer.function = ir_rx51_timer_cb;
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ir_rx51.dev = &dev->dev;
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rcdev = devm_rc_allocate_device(&dev->dev, RC_DRIVER_IR_RAW_TX);
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if (!rcdev)
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return -ENOMEM;
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rcdev->priv = &ir_rx51;
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rcdev->open = ir_rx51_open;
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rcdev->close = ir_rx51_release;
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rcdev->tx_ir = ir_rx51_tx;
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rcdev->s_tx_duty_cycle = ir_rx51_set_duty_cycle;
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rcdev->s_tx_carrier = ir_rx51_set_tx_carrier;
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rcdev->driver_name = KBUILD_MODNAME;
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ir_rx51.rcdev = rcdev;
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return devm_rc_register_device(&dev->dev, ir_rx51.rcdev);
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}
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static int ir_rx51_remove(struct platform_device *dev)
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{
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return 0;
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}
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static const struct of_device_id ir_rx51_match[] = {
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{
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.compatible = "nokia,n900-ir",
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, ir_rx51_match);
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static struct platform_driver ir_rx51_platform_driver = {
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.probe = ir_rx51_probe,
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.remove = ir_rx51_remove,
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.suspend = ir_rx51_suspend,
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.resume = ir_rx51_resume,
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.driver = {
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.name = KBUILD_MODNAME,
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.of_match_table = of_match_ptr(ir_rx51_match),
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},
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};
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module_platform_driver(ir_rx51_platform_driver);
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MODULE_DESCRIPTION("IR TX driver for Nokia RX51");
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MODULE_AUTHOR("Nokia Corporation");
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MODULE_LICENSE("GPL");
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