1 files changed, 498 insertions, 0 deletions
diff --git a/drivers/media/rc/ir-rx51.c b/drivers/media/rc/ir-rx51.c
new file mode 100644
index 000000000000..546199e9ccc7
--- /dev/null
+++ b/drivers/media/rc/ir-rx51.c
@@ -0,0 +1,498 @@
+/*
+ *  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;
+	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,
+				OMAP_TIMER_INT_MATCH	|
+				OMAP_TIMER_INT_OVERFLOW	|
+				OMAP_TIMER_INT_CAPTURE);
+	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,
+	.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");