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79cdad3635
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>
413 lines
9.3 KiB
C
413 lines
9.3 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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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/interrupt.h>
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#include <linux/uaccess.h>
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#include <linux/platform_device.h>
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#include <linux/sched.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/lirc.h>
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#include <media/lirc_dev.h>
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#include <linux/platform_data/media/ir-rx51.h>
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#define LIRC_RX51_DRIVER_FEATURES (LIRC_CAN_SET_SEND_DUTY_CYCLE | \
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LIRC_CAN_SET_SEND_CARRIER | \
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LIRC_CAN_SEND_PULSE)
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#define DRIVER_NAME "lirc_rx51"
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#define WBUF_LEN 256
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struct lirc_rx51 {
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struct pwm_device *pwm;
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struct hrtimer timer;
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struct device *dev;
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struct lirc_rx51_platform_data *pdata;
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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 lirc_rx51_on(struct lirc_rx51 *lirc_rx51)
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{
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pwm_enable(lirc_rx51->pwm);
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}
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static inline void lirc_rx51_off(struct lirc_rx51 *lirc_rx51)
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{
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pwm_disable(lirc_rx51->pwm);
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}
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static int init_timing_params(struct lirc_rx51 *lirc_rx51)
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{
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struct pwm_device *pwm = lirc_rx51->pwm;
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int duty, period = DIV_ROUND_CLOSEST(NSEC_PER_SEC, lirc_rx51->freq);
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duty = DIV_ROUND_CLOSEST(lirc_rx51->duty_cycle * period, 100);
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pwm_config(pwm, duty, period);
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return 0;
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}
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static enum hrtimer_restart lirc_rx51_timer_cb(struct hrtimer *timer)
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{
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struct lirc_rx51 *lirc_rx51 =
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container_of(timer, struct lirc_rx51, timer);
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ktime_t now;
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if (lirc_rx51->wbuf_index < 0) {
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dev_err_ratelimited(lirc_rx51->dev,
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"BUG wbuf_index has value of %i\n",
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lirc_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 (lirc_rx51->wbuf_index >= WBUF_LEN)
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goto end;
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if (lirc_rx51->wbuf[lirc_rx51->wbuf_index] == -1)
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goto end;
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if (lirc_rx51->wbuf_index % 2)
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lirc_rx51_off(lirc_rx51);
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else
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lirc_rx51_on(lirc_rx51);
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ns = 1000 * lirc_rx51->wbuf[lirc_rx51->wbuf_index];
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hrtimer_add_expires_ns(timer, ns);
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lirc_rx51->wbuf_index++;
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now = timer->base->get_time();
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} while (hrtimer_get_expires_tv64(timer) < now.tv64);
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return HRTIMER_RESTART;
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end:
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/* Stop TX here */
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lirc_rx51_off(lirc_rx51);
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lirc_rx51->wbuf_index = -1;
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wake_up_interruptible(&lirc_rx51->wqueue);
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return HRTIMER_NORESTART;
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}
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static ssize_t lirc_rx51_write(struct file *file, const char *buf,
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size_t n, loff_t *ppos)
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{
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int count, i;
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struct lirc_rx51 *lirc_rx51 = file->private_data;
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if (n % sizeof(int))
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return -EINVAL;
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count = n / sizeof(int);
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if ((count > WBUF_LEN) || (count % 2 == 0))
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return -EINVAL;
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/* Wait any pending transfers to finish */
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wait_event_interruptible(lirc_rx51->wqueue, lirc_rx51->wbuf_index < 0);
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if (copy_from_user(lirc_rx51->wbuf, buf, n))
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return -EFAULT;
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/* Sanity check the input pulses */
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for (i = 0; i < count; i++)
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if (lirc_rx51->wbuf[i] < 0)
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return -EINVAL;
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init_timing_params(lirc_rx51);
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if (count < WBUF_LEN)
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lirc_rx51->wbuf[count] = -1; /* Insert termination mark */
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/*
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* Adjust latency requirements so the device doesn't go in too
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* deep sleep states
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*/
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lirc_rx51->pdata->set_max_mpu_wakeup_lat(lirc_rx51->dev, 50);
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lirc_rx51_on(lirc_rx51);
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lirc_rx51->wbuf_index = 1;
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hrtimer_start(&lirc_rx51->timer,
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ns_to_ktime(1000 * lirc_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(lirc_rx51->wqueue, lirc_rx51->wbuf_index < 0);
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/* We can sleep again */
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lirc_rx51->pdata->set_max_mpu_wakeup_lat(lirc_rx51->dev, -1);
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return n;
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}
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static long lirc_rx51_ioctl(struct file *filep,
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unsigned int cmd, unsigned long arg)
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{
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int result;
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unsigned long value;
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unsigned int ivalue;
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struct lirc_rx51 *lirc_rx51 = filep->private_data;
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switch (cmd) {
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case LIRC_GET_SEND_MODE:
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result = put_user(LIRC_MODE_PULSE, (unsigned long *)arg);
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if (result)
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return result;
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break;
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case LIRC_SET_SEND_MODE:
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result = get_user(value, (unsigned long *)arg);
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if (result)
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return result;
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/* only LIRC_MODE_PULSE supported */
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if (value != LIRC_MODE_PULSE)
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return -ENOSYS;
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break;
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case LIRC_GET_REC_MODE:
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result = put_user(0, (unsigned long *) arg);
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if (result)
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return result;
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break;
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case LIRC_GET_LENGTH:
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return -ENOSYS;
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break;
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case LIRC_SET_SEND_DUTY_CYCLE:
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result = get_user(ivalue, (unsigned int *) arg);
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if (result)
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return result;
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if (ivalue <= 0 || ivalue > 100) {
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dev_err(lirc_rx51->dev, ": invalid duty cycle %d\n",
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ivalue);
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return -EINVAL;
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}
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lirc_rx51->duty_cycle = ivalue;
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break;
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case LIRC_SET_SEND_CARRIER:
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result = get_user(ivalue, (unsigned int *) arg);
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if (result)
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return result;
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if (ivalue > 500000 || ivalue < 20000) {
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dev_err(lirc_rx51->dev, ": invalid carrier freq %d\n",
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ivalue);
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return -EINVAL;
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}
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lirc_rx51->freq = ivalue;
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break;
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case LIRC_GET_FEATURES:
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result = put_user(LIRC_RX51_DRIVER_FEATURES,
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(unsigned long *) arg);
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if (result)
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return result;
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break;
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default:
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return -ENOIOCTLCMD;
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}
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return 0;
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}
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static int lirc_rx51_open(struct inode *inode, struct file *file)
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{
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struct lirc_rx51 *lirc_rx51 = lirc_get_pdata(file);
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BUG_ON(!lirc_rx51);
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file->private_data = lirc_rx51;
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if (test_and_set_bit(1, &lirc_rx51->device_is_open))
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return -EBUSY;
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lirc_rx51->pwm = pwm_get(lirc_rx51->dev, NULL);
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if (IS_ERR(lirc_rx51->pwm)) {
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int res = PTR_ERR(lirc_rx51->pwm);
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dev_err(lirc_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 int lirc_rx51_release(struct inode *inode, struct file *file)
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{
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struct lirc_rx51 *lirc_rx51 = file->private_data;
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hrtimer_cancel(&lirc_rx51->timer);
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lirc_rx51_off(lirc_rx51);
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pwm_put(lirc_rx51->pwm);
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clear_bit(1, &lirc_rx51->device_is_open);
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return 0;
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}
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static struct lirc_rx51 lirc_rx51 = {
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.duty_cycle = 50,
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.wbuf_index = -1,
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};
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static const struct file_operations lirc_fops = {
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.owner = THIS_MODULE,
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.write = lirc_rx51_write,
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.unlocked_ioctl = lirc_rx51_ioctl,
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.read = lirc_dev_fop_read,
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.poll = lirc_dev_fop_poll,
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.open = lirc_rx51_open,
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.release = lirc_rx51_release,
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};
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static struct lirc_driver lirc_rx51_driver = {
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.name = DRIVER_NAME,
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.minor = -1,
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.code_length = 1,
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.data = &lirc_rx51,
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.fops = &lirc_fops,
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.owner = THIS_MODULE,
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};
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#ifdef CONFIG_PM
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static int lirc_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, &lirc_rx51.device_is_open))
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return -EAGAIN;
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clear_bit(1, &lirc_rx51.device_is_open);
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return 0;
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}
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static int lirc_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 lirc_rx51_suspend NULL
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#define lirc_rx51_resume NULL
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#endif /* CONFIG_PM */
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static int lirc_rx51_probe(struct platform_device *dev)
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{
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struct pwm_device *pwm;
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lirc_rx51_driver.features = LIRC_RX51_DRIVER_FEATURES;
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lirc_rx51.pdata = dev->dev.platform_data;
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if (!lirc_rx51.pdata) {
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dev_err(&dev->dev, "Platform Data is missing\n");
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return -ENXIO;
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}
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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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lirc_rx51.freq = DIV_ROUND_CLOSEST(pwm_get_period(pwm), NSEC_PER_SEC);
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pwm_put(pwm);
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hrtimer_init(&lirc_rx51.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
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lirc_rx51.timer.function = lirc_rx51_timer_cb;
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lirc_rx51.dev = &dev->dev;
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lirc_rx51_driver.dev = &dev->dev;
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lirc_rx51_driver.minor = lirc_register_driver(&lirc_rx51_driver);
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init_waitqueue_head(&lirc_rx51.wqueue);
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if (lirc_rx51_driver.minor < 0) {
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dev_err(lirc_rx51.dev, ": lirc_register_driver failed: %d\n",
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lirc_rx51_driver.minor);
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return lirc_rx51_driver.minor;
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}
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return 0;
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}
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static int lirc_rx51_remove(struct platform_device *dev)
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{
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return lirc_unregister_driver(lirc_rx51_driver.minor);
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}
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static const struct of_device_id lirc_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, lirc_rx51_match);
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struct platform_driver lirc_rx51_platform_driver = {
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.probe = lirc_rx51_probe,
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.remove = lirc_rx51_remove,
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.suspend = lirc_rx51_suspend,
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.resume = lirc_rx51_resume,
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.driver = {
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.name = DRIVER_NAME,
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.of_match_table = of_match_ptr(lirc_rx51_match),
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},
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};
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module_platform_driver(lirc_rx51_platform_driver);
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MODULE_DESCRIPTION("LIRC TX driver for Nokia RX51");
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MODULE_AUTHOR("Nokia Corporation");
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MODULE_LICENSE("GPL");
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