499 lines
12 KiB
C
499 lines
12 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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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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 <plat/dmtimer.h>
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#include <plat/clock.h>
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#include <plat/omap-pm.h>
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#include <media/lirc.h>
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#include <media/lirc_dev.h>
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#include <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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#define TIMER_MAX_VALUE 0xffffffff
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struct lirc_rx51 {
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struct omap_dm_timer *pwm_timer;
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struct omap_dm_timer *pulse_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 long fclk_khz;
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unsigned int freq; /* carrier frequency */
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unsigned int duty_cycle; /* carrier duty cycle */
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unsigned int irq_num;
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unsigned int match;
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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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int pwm_timer_num;
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};
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static void lirc_rx51_on(struct lirc_rx51 *lirc_rx51)
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{
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omap_dm_timer_set_pwm(lirc_rx51->pwm_timer, 0, 1,
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OMAP_TIMER_TRIGGER_OVERFLOW_AND_COMPARE);
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}
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static void lirc_rx51_off(struct lirc_rx51 *lirc_rx51)
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{
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omap_dm_timer_set_pwm(lirc_rx51->pwm_timer, 0, 1,
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OMAP_TIMER_TRIGGER_NONE);
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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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u32 load, match;
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load = -(lirc_rx51->fclk_khz * 1000 / lirc_rx51->freq);
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match = -(lirc_rx51->duty_cycle * -load / 100);
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omap_dm_timer_set_load(lirc_rx51->pwm_timer, 1, load);
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omap_dm_timer_set_match(lirc_rx51->pwm_timer, 1, match);
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omap_dm_timer_write_counter(lirc_rx51->pwm_timer, TIMER_MAX_VALUE - 2);
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omap_dm_timer_start(lirc_rx51->pwm_timer);
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omap_dm_timer_set_int_enable(lirc_rx51->pulse_timer, 0);
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omap_dm_timer_start(lirc_rx51->pulse_timer);
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lirc_rx51->match = 0;
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return 0;
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}
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#define tics_after(a, b) ((long)(b) - (long)(a) < 0)
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static int pulse_timer_set_timeout(struct lirc_rx51 *lirc_rx51, int usec)
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{
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int counter;
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BUG_ON(usec < 0);
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if (lirc_rx51->match == 0)
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counter = omap_dm_timer_read_counter(lirc_rx51->pulse_timer);
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else
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counter = lirc_rx51->match;
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counter += (u32)(lirc_rx51->fclk_khz * usec / (1000));
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omap_dm_timer_set_match(lirc_rx51->pulse_timer, 1, counter);
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omap_dm_timer_set_int_enable(lirc_rx51->pulse_timer,
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OMAP_TIMER_INT_MATCH);
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if (tics_after(omap_dm_timer_read_counter(lirc_rx51->pulse_timer),
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counter)) {
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return 1;
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}
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return 0;
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}
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static irqreturn_t lirc_rx51_interrupt_handler(int irq, void *ptr)
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{
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unsigned int retval;
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struct lirc_rx51 *lirc_rx51 = ptr;
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retval = omap_dm_timer_read_status(lirc_rx51->pulse_timer);
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if (!retval)
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return IRQ_NONE;
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if (retval & ~OMAP_TIMER_INT_MATCH)
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dev_err_ratelimited(lirc_rx51->dev,
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": Unexpected interrupt source: %x\n", retval);
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omap_dm_timer_write_status(lirc_rx51->pulse_timer,
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OMAP_TIMER_INT_MATCH |
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OMAP_TIMER_INT_OVERFLOW |
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OMAP_TIMER_INT_CAPTURE);
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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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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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retval = pulse_timer_set_timeout(lirc_rx51,
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lirc_rx51->wbuf[lirc_rx51->wbuf_index]);
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lirc_rx51->wbuf_index++;
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} while (retval);
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return IRQ_HANDLED;
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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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omap_dm_timer_stop(lirc_rx51->pwm_timer);
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omap_dm_timer_stop(lirc_rx51->pulse_timer);
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omap_dm_timer_set_int_enable(lirc_rx51->pulse_timer, 0);
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wake_up_interruptible(&lirc_rx51->wqueue);
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return IRQ_HANDLED;
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}
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static int lirc_rx51_init_port(struct lirc_rx51 *lirc_rx51)
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{
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struct clk *clk_fclk;
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int retval, pwm_timer = lirc_rx51->pwm_timer_num;
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lirc_rx51->pwm_timer = omap_dm_timer_request_specific(pwm_timer);
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if (lirc_rx51->pwm_timer == NULL) {
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dev_err(lirc_rx51->dev, ": Error requesting GPT%d timer\n",
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pwm_timer);
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return -EBUSY;
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}
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lirc_rx51->pulse_timer = omap_dm_timer_request();
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if (lirc_rx51->pulse_timer == NULL) {
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dev_err(lirc_rx51->dev, ": Error requesting pulse timer\n");
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retval = -EBUSY;
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goto err1;
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}
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omap_dm_timer_set_source(lirc_rx51->pwm_timer, OMAP_TIMER_SRC_SYS_CLK);
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omap_dm_timer_set_source(lirc_rx51->pulse_timer,
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OMAP_TIMER_SRC_SYS_CLK);
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omap_dm_timer_enable(lirc_rx51->pwm_timer);
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omap_dm_timer_enable(lirc_rx51->pulse_timer);
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lirc_rx51->irq_num = omap_dm_timer_get_irq(lirc_rx51->pulse_timer);
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retval = request_irq(lirc_rx51->irq_num, lirc_rx51_interrupt_handler,
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IRQF_DISABLED | IRQF_SHARED,
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"lirc_pulse_timer", lirc_rx51);
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if (retval) {
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dev_err(lirc_rx51->dev, ": Failed to request interrupt line\n");
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goto err2;
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}
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clk_fclk = omap_dm_timer_get_fclk(lirc_rx51->pwm_timer);
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lirc_rx51->fclk_khz = clk_fclk->rate / 1000;
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return 0;
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err2:
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omap_dm_timer_free(lirc_rx51->pulse_timer);
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err1:
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omap_dm_timer_free(lirc_rx51->pwm_timer);
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return retval;
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}
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static int lirc_rx51_free_port(struct lirc_rx51 *lirc_rx51)
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{
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omap_dm_timer_set_int_enable(lirc_rx51->pulse_timer, 0);
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free_irq(lirc_rx51->irq_num, lirc_rx51);
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lirc_rx51_off(lirc_rx51);
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omap_dm_timer_disable(lirc_rx51->pwm_timer);
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omap_dm_timer_disable(lirc_rx51->pulse_timer);
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omap_dm_timer_free(lirc_rx51->pwm_timer);
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omap_dm_timer_free(lirc_rx51->pulse_timer);
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lirc_rx51->wbuf_index = -1;
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return 0;
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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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pulse_timer_set_timeout(lirc_rx51, lirc_rx51->wbuf[0]);
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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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return lirc_rx51_init_port(lirc_rx51);
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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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lirc_rx51_free_port(lirc_rx51);
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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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.freq = 38000,
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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 __devinit lirc_rx51_probe(struct platform_device *dev)
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{
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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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lirc_rx51.pwm_timer_num = lirc_rx51.pdata->pwm_timer;
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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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dev_info(lirc_rx51.dev, "registration ok, minor: %d, pwm: %d\n",
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lirc_rx51_driver.minor, lirc_rx51.pwm_timer_num);
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return 0;
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}
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static int __exit 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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struct platform_driver lirc_rx51_platform_driver = {
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.probe = lirc_rx51_probe,
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.remove = __exit_p(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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.owner = THIS_MODULE,
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},
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};
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static int __init lirc_rx51_init(void)
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{
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return platform_driver_register(&lirc_rx51_platform_driver);
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}
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module_init(lirc_rx51_init);
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static void __exit lirc_rx51_exit(void)
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{
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platform_driver_unregister(&lirc_rx51_platform_driver);
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}
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module_exit(lirc_rx51_exit);
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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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