--- /dev/null
+/*
+ * Copyright (C) 2008 Nokia Corporation
+ *
+ * Based on lirc_serial.c
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/uaccess.h>
+#include <linux/platform_device.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+
+#include <plat/dmtimer.h>
+#include <plat/clock.h>
+#include <plat/omap-pm.h>
+
+#include <media/lirc.h>
+#include <media/lirc_dev.h>
+#include <media/ir-rx51.h>
+
+#define LIRC_RX51_DRIVER_FEATURES (LIRC_CAN_SET_SEND_DUTY_CYCLE | \
+ LIRC_CAN_SET_SEND_CARRIER | \
+ LIRC_CAN_SEND_PULSE)
+
+#define DRIVER_NAME "lirc_rx51"
+
+#define WBUF_LEN 256
+
+#define TIMER_MAX_VALUE 0xffffffff
+
+struct lirc_rx51 {
+ struct omap_dm_timer *pwm_timer;
+ struct omap_dm_timer *pulse_timer;
+ struct device *dev;
+ struct lirc_rx51_platform_data *pdata;
+ wait_queue_head_t wqueue;
+
+ unsigned long fclk_khz;
+ unsigned int freq; /* carrier frequency */
+ unsigned int duty_cycle; /* carrier duty cycle */
+ unsigned int irq_num;
+ unsigned int match;
+ int wbuf[WBUF_LEN];
+ int wbuf_index;
+ unsigned long device_is_open;
+ unsigned int pwm_timer_num;
+};
+
+static void lirc_rx51_on(struct lirc_rx51 *lirc_rx51)
+{
+ omap_dm_timer_set_pwm(lirc_rx51->pwm_timer, 0, 1,
+ OMAP_TIMER_TRIGGER_OVERFLOW_AND_COMPARE);
+}
+
+static void lirc_rx51_off(struct lirc_rx51 *lirc_rx51)
+{
+ omap_dm_timer_set_pwm(lirc_rx51->pwm_timer, 0, 1,
+ OMAP_TIMER_TRIGGER_NONE);
+}
+
+static int init_timing_params(struct lirc_rx51 *lirc_rx51)
+{
+ u32 load, match;
+
+ load = -(lirc_rx51->fclk_khz * 1000 / lirc_rx51->freq);
+ match = -(lirc_rx51->duty_cycle * -load / 100);
+ omap_dm_timer_set_load(lirc_rx51->pwm_timer, 1, load);
+ omap_dm_timer_set_match(lirc_rx51->pwm_timer, 1, match);
+ omap_dm_timer_write_counter(lirc_rx51->pwm_timer, TIMER_MAX_VALUE - 2);
+ omap_dm_timer_start(lirc_rx51->pwm_timer);
+ omap_dm_timer_set_int_enable(lirc_rx51->pulse_timer, 0);
+ omap_dm_timer_start(lirc_rx51->pulse_timer);
+
+ lirc_rx51->match = 0;
+
+ return 0;
+}
+
+#define tics_after(a, b) ((long)(b) - (long)(a) < 0)
+
+static int pulse_timer_set_timeout(struct lirc_rx51 *lirc_rx51, int usec)
+{
+ int counter;
+
+ BUG_ON(usec < 0);
+
+ if (lirc_rx51->match == 0)
+ counter = omap_dm_timer_read_counter(lirc_rx51->pulse_timer);
+ else
+ counter = lirc_rx51->match;
+
+ counter += (u32)(lirc_rx51->fclk_khz * usec / (1000));
+ omap_dm_timer_set_match(lirc_rx51->pulse_timer, 1, counter);
+ omap_dm_timer_set_int_enable(lirc_rx51->pulse_timer,
+ OMAP_TIMER_INT_MATCH);
+ if (tics_after(omap_dm_timer_read_counter(lirc_rx51->pulse_timer),
+ counter)) {
+ return 1;
+ }
+ return 0;
+}
+
+static irqreturn_t lirc_rx51_interrupt_handler(int irq, void *ptr)
+{
+ unsigned int retval;
+ struct lirc_rx51 *lirc_rx51 = ptr;
+
+ retval = omap_dm_timer_read_status(lirc_rx51->pulse_timer);
+ if (!retval)
+ return IRQ_NONE;
+
+ if ((retval & ~OMAP_TIMER_INT_MATCH))
+ dev_err_ratelimited(lirc_rx51->dev,
+ ": Unexpected interrupt source: %x\n", retval);
+
+ omap_dm_timer_write_status(lirc_rx51->pulse_timer, 7);
+ if (lirc_rx51->wbuf_index < 0) {
+ dev_err_ratelimited(lirc_rx51->dev,
+ ": BUG wbuf_index has value of %i\n",
+ lirc_rx51->wbuf_index);
+ goto end;
+ }
+
+ /*
+ * If we happen to hit an odd latency spike, loop through the
+ * pulses until we catch up.
+ */
+ do {
+ if (lirc_rx51->wbuf_index >= WBUF_LEN)
+ goto end;
+ if (lirc_rx51->wbuf[lirc_rx51->wbuf_index] == -1)
+ goto end;
+
+ if (lirc_rx51->wbuf_index % 2)
+ lirc_rx51_off(lirc_rx51);
+ else
+ lirc_rx51_on(lirc_rx51);
+
+ retval = pulse_timer_set_timeout(lirc_rx51,
+ lirc_rx51->wbuf[lirc_rx51->wbuf_index]);
+ lirc_rx51->wbuf_index++;
+
+ } while (retval);
+
+ return IRQ_HANDLED;
+end:
+ /* Stop TX here */
+ lirc_rx51_off(lirc_rx51);
+ lirc_rx51->wbuf_index = -1;
+ omap_dm_timer_stop(lirc_rx51->pwm_timer);
+ omap_dm_timer_stop(lirc_rx51->pulse_timer);
+ omap_dm_timer_set_int_enable(lirc_rx51->pulse_timer, 0);
+ wake_up_interruptible(&lirc_rx51->wqueue);
+
+ return IRQ_HANDLED;
+}
+
+static int lirc_rx51_init_port(struct lirc_rx51 *lirc_rx51)
+{
+ struct clk *clk_fclk;
+ int retval, pwm_timer = lirc_rx51->pwm_timer_num;
+
+ lirc_rx51->pwm_timer = omap_dm_timer_request_specific(pwm_timer);
+ if (lirc_rx51->pwm_timer == NULL) {
+ dev_err(lirc_rx51->dev, ": Error requesting GPT%d timer\n",
+ pwm_timer);
+ return -EBUSY;
+ }
+
+ lirc_rx51->pulse_timer = omap_dm_timer_request();
+ if (lirc_rx51->pulse_timer == NULL) {
+ dev_err(lirc_rx51->dev, ": Error requesting pulse timer\n");
+ retval = -EBUSY;
+ goto err1;
+ }
+
+ omap_dm_timer_set_source(lirc_rx51->pwm_timer, OMAP_TIMER_SRC_SYS_CLK);
+ omap_dm_timer_set_source(lirc_rx51->pulse_timer,
+ OMAP_TIMER_SRC_SYS_CLK);
+
+ omap_dm_timer_enable(lirc_rx51->pwm_timer);
+ omap_dm_timer_enable(lirc_rx51->pulse_timer);
+
+ lirc_rx51->irq_num = omap_dm_timer_get_irq(lirc_rx51->pulse_timer);
+ retval = request_irq(lirc_rx51->irq_num, lirc_rx51_interrupt_handler,
+ IRQF_DISABLED | IRQF_SHARED,
+ "lirc_pulse_timer", lirc_rx51);
+ if (retval) {
+ dev_err(lirc_rx51->dev, ": Failed to request interrupt line\n");
+ goto err2;
+ }
+
+ clk_fclk = omap_dm_timer_get_fclk(lirc_rx51->pwm_timer);
+ lirc_rx51->fclk_khz = clk_fclk->rate / 1000;
+
+ return 0;
+
+err2:
+ omap_dm_timer_free(lirc_rx51->pulse_timer);
+err1:
+ omap_dm_timer_free(lirc_rx51->pwm_timer);
+
+ return retval;
+}
+
+static int lirc_rx51_free_port(struct lirc_rx51 *lirc_rx51)
+{
+ omap_dm_timer_set_int_enable(lirc_rx51->pulse_timer, 0);
+ free_irq(lirc_rx51->irq_num, lirc_rx51);
+ lirc_rx51_off(lirc_rx51);
+ omap_dm_timer_disable(lirc_rx51->pwm_timer);
+ omap_dm_timer_disable(lirc_rx51->pulse_timer);
+ omap_dm_timer_free(lirc_rx51->pwm_timer);
+ omap_dm_timer_free(lirc_rx51->pulse_timer);
+ lirc_rx51->wbuf_index = -1;
+
+ return 0;
+}
+
+static ssize_t lirc_rx51_write(struct file *file, const char *buf,
+ size_t n, loff_t *ppos)
+{
+ int count, i;
+ struct lirc_rx51 *lirc_rx51 = file->private_data;
+
+ if (n % sizeof(int))
+ return -EINVAL;
+
+ count = n / sizeof(int);
+ if ((count > WBUF_LEN) || (count % 2 == 0))
+ return -EINVAL;
+
+ /* Wait any pending transfers to finish */
+ wait_event_interruptible(lirc_rx51->wqueue, lirc_rx51->wbuf_index < 0);
+
+ if (copy_from_user(lirc_rx51->wbuf, buf, n))
+ return -EFAULT;
+
+ /* Sanity check the input pulses */
+ for (i = 0; i < count; i++)
+ if (lirc_rx51->wbuf[i] < 0)
+ return -EINVAL;
+
+ init_timing_params(lirc_rx51);
+ if (count < WBUF_LEN)
+ lirc_rx51->wbuf[count] = -1; /* Insert termination mark */
+
+ /*
+ * Adjust latency requirements so the device doesn't go in too
+ * deep sleep states
+ */
+ lirc_rx51->pdata->set_max_mpu_wakeup_lat(lirc_rx51->dev, 50);
+
+ lirc_rx51_on(lirc_rx51);
+ lirc_rx51->wbuf_index = 1;
+ pulse_timer_set_timeout(lirc_rx51, lirc_rx51->wbuf[0]);
+
+ /*
+ * Don't return back to the userspace until the transfer has
+ * finished
+ */
+ wait_event_interruptible(lirc_rx51->wqueue, lirc_rx51->wbuf_index < 0);
+
+ /* We can sleep again */
+ lirc_rx51->pdata->set_max_mpu_wakeup_lat(lirc_rx51->dev, -1);
+
+ return n;
+}
+
+static long lirc_rx51_ioctl(struct file *filep,
+ unsigned int cmd, unsigned long arg)
+{
+ int result;
+ unsigned long value;
+ unsigned int ivalue;
+ struct lirc_rx51 *lirc_rx51 = filep->private_data;
+
+ switch (cmd) {
+ case LIRC_GET_SEND_MODE:
+ result = put_user(LIRC_MODE_PULSE, (unsigned long *)arg);
+ if (result)
+ return result;
+ break;
+
+ case LIRC_SET_SEND_MODE:
+ result = get_user(value, (unsigned long *)arg);
+ if (result)
+ return result;
+
+ /* only LIRC_MODE_PULSE supported */
+ if (value != LIRC_MODE_PULSE)
+ return -ENOSYS;
+ break;
+
+ case LIRC_GET_REC_MODE:
+ result = put_user(0, (unsigned long *) arg);
+ if (result)
+ return result;
+ break;
+
+ case LIRC_GET_LENGTH:
+ return -ENOSYS;
+ break;
+
+ case LIRC_SET_SEND_DUTY_CYCLE:
+ result = get_user(ivalue, (unsigned int *) arg);
+ if (result)
+ return result;
+
+ if (ivalue <= 0 || ivalue > 100) {
+ dev_err(lirc_rx51->dev, ": invalid duty cycle %d\n",
+ ivalue);
+ return -EINVAL;
+ }
+
+ lirc_rx51->duty_cycle = ivalue;
+ break;
+
+ case LIRC_SET_SEND_CARRIER:
+ result = get_user(ivalue, (unsigned int *) arg);
+ if (result)
+ return result;
+
+ if (ivalue > 500000 || ivalue < 20000) {
+ dev_err(lirc_rx51->dev, ": invalid carrier freq %d\n",
+ ivalue);
+ return -EINVAL;
+ }
+
+ lirc_rx51->freq = ivalue;
+ break;
+
+ case LIRC_GET_FEATURES:
+ result = put_user(LIRC_RX51_DRIVER_FEATURES,
+ (unsigned long *) arg);
+ if (result)
+ return result;
+ break;
+
+ default:
+ return -ENOIOCTLCMD;
+ }
+
+ return 0;
+}
+
+static int lirc_rx51_open(struct inode *inode, struct file *file)
+{
+ struct lirc_rx51 *lirc_rx51 = lirc_get_pdata(file);
+ BUG_ON(!lirc_rx51);
+
+ file->private_data = lirc_rx51;
+
+ if (test_and_set_bit(1, &lirc_rx51->device_is_open))
+ return -EBUSY;
+
+ return lirc_rx51_init_port(lirc_rx51);
+}
+
+static int lirc_rx51_release(struct inode *inode, struct file *file)
+{
+ struct lirc_rx51 *lirc_rx51 = file->private_data;
+
+ lirc_rx51_free_port(lirc_rx51);
+
+ clear_bit(1, &lirc_rx51->device_is_open);
+
+ return 0;
+}
+
+static struct lirc_rx51 lirc_rx51 = {
+ .freq = 38000,
+ .duty_cycle = 50,
+ .wbuf_index = -1,
+};
+
+static const struct file_operations lirc_fops = {
+ .owner = THIS_MODULE,
+ .write = lirc_rx51_write,
+ .unlocked_ioctl = lirc_rx51_ioctl,
+ .read = lirc_dev_fop_read,
+ .poll = lirc_dev_fop_poll,
+ .open = lirc_rx51_open,
+ .release = lirc_rx51_release,
+};
+
+static struct lirc_driver lirc_rx51_driver = {
+ .name = DRIVER_NAME,
+ .minor = -1,
+ .code_length = 1,
+ .data = &lirc_rx51,
+ .fops = &lirc_fops,
+ .owner = THIS_MODULE,
+};
+
+#ifdef CONFIG_PM
+
+static int lirc_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, &lirc_rx51.device_is_open))
+ return -EAGAIN;
+
+ clear_bit(1, &lirc_rx51.device_is_open);
+
+ return 0;
+}
+
+static int lirc_rx51_resume(struct platform_device *dev)
+{
+ return 0;
+}
+
+#else
+
+#define lirc_rx51_suspend NULL
+#define lirc_rx51_resume NULL
+
+#endif /* CONFIG_PM */
+
+static int __devinit lirc_rx51_probe(struct platform_device *dev)
+{
+ lirc_rx51_driver.features = LIRC_RX51_DRIVER_FEATURES;
+ lirc_rx51.pdata = dev->dev.platform_data;
+ lirc_rx51.pwm_timer_num = lirc_rx51.pdata->pwm_timer;
+ lirc_rx51.dev = &dev->dev;
+ lirc_rx51_driver.dev = &dev->dev;
+ lirc_rx51_driver.minor = lirc_register_driver(&lirc_rx51_driver);
+ init_waitqueue_head(&lirc_rx51.wqueue);
+
+ if (lirc_rx51_driver.minor < 0) {
+ dev_err(lirc_rx51.dev, ": lirc_register_driver failed: %d\n",
+ lirc_rx51_driver.minor);
+ return lirc_rx51_driver.minor;
+ }
+ dev_info(lirc_rx51.dev, "registration ok, minor: %d, pwm: %d\n",
+ lirc_rx51_driver.minor, lirc_rx51.pwm_timer_num);
+
+ return 0;
+}
+
+static int __exit lirc_rx51_remove(struct platform_device *dev)
+{
+ return lirc_unregister_driver(lirc_rx51_driver.minor);
+}
+
+struct platform_driver lirc_rx51_platform_driver = {
+ .probe = lirc_rx51_probe,
+ .remove = __exit_p(lirc_rx51_remove),
+ .suspend = lirc_rx51_suspend,
+ .resume = lirc_rx51_resume,
+ .remove = __exit_p(lirc_rx51_remove),
+ .driver = {
+ .name = DRIVER_NAME,
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init lirc_rx51_init(void)
+{
+ return platform_driver_register(&lirc_rx51_platform_driver);
+}
+module_init(lirc_rx51_init);
+
+static void __exit lirc_rx51_exit(void)
+{
+ platform_driver_unregister(&lirc_rx51_platform_driver);
+}
+module_exit(lirc_rx51_exit);
+
+MODULE_DESCRIPTION("LIRC TX driver for Nokia RX51");
+MODULE_AUTHOR("Nokia Corporation");
+MODULE_LICENSE("GPL");
projects / linux-beck.git / commitdiff