path: root/drivers/media/video/saa7134/saa7134-input.c

/*
 *
 * handle saa7134 IR remotes via linux kernel input layer.
 *
 * 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/init.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/slab.h>

#include "saa7134-reg.h"
#include "saa7134.h"

#define MODULE_NAME "saa7134"

static unsigned int disable_ir;
module_param(disable_ir, int, 0444);
MODULE_PARM_DESC(disable_ir,"disable infrared remote support");

static unsigned int ir_debug;
module_param(ir_debug, int, 0644);
MODULE_PARM_DESC(ir_debug,"enable debug messages [IR]");

static int pinnacle_remote;
module_param(pinnacle_remote, int, 0644);    /* Choose Pinnacle PCTV remote */
MODULE_PARM_DESC(pinnacle_remote, "Specify Pinnacle PCTV remote: 0=coloured, 1=grey (defaults to 0)");

#define dprintk(fmt, arg...)	if (ir_debug) \
	printk(KERN_DEBUG "%s/ir: " fmt, dev->name , ## arg)
#define i2cdprintk(fmt, arg...)    if (ir_debug) \
	printk(KERN_DEBUG "%s/ir: " fmt, ir->name , ## arg)

/* Helper function for raw decoding at GPIO16 or GPIO18 */
static int saa7134_raw_decode_irq(struct saa7134_dev *dev);

/* -------------------- GPIO generic keycode builder -------------------- */

static int build_key(struct saa7134_dev *dev)
{
	struct saa7134_card_ir *ir = dev->remote;
	u32 gpio, data;

	/* here comes the additional handshake steps for some cards */
	switch (dev->board) {
	case SAA7134_BOARD_GOTVIEW_7135:
		saa_setb(SAA7134_GPIO_GPSTATUS1, 0x80);
		saa_clearb(SAA7134_GPIO_GPSTATUS1, 0x80);
		break;
	}
	/* rising SAA7134_GPIO_GPRESCAN reads the status */
	saa_clearb(SAA7134_GPIO_GPMODE3,SAA7134_GPIO_GPRESCAN);
	saa_setb(SAA7134_GPIO_GPMODE3,SAA7134_GPIO_GPRESCAN);

	gpio = saa_readl(SAA7134_GPIO_GPSTATUS0 >> 2);
	if (ir->polling) {
		if (ir->last_gpio == gpio)
			return 0;
		ir->last_gpio = gpio;
	}

	data = ir_extract_bits(gpio, ir->mask_keycode);
	dprintk("build_key gpio=0x%x mask=0x%x data=%d\n",
		gpio, ir->mask_keycode, data);

	switch (dev->board) {
	case SAA7134_BOARD_KWORLD_PLUS_TV_ANALOG:
		if (data == ir->mask_keycode)
			rc_keyup(ir->dev);
		else
			rc_keydown_notimeout(ir->dev, data, 0);
		return 0;
	}

	if (ir->polling) {
		if ((ir->mask_keydown  &&  (0 != (gpio & ir->mask_keydown))) ||
		    (ir->mask_keyup    &&  (0 == (gpio & ir->mask_keyup)))) {
			rc_keydown_notimeout(ir->dev, data, 0);
		} else {
			rc_keyup(ir->dev);
		}
	}
	else {	/* IRQ driven mode - handle key press and release in one go */
		if ((ir->mask_keydown  &&  (0 != (gpio & ir->mask_keydown))) ||
		    (ir->mask_keyup    &&  (0 == (gpio & ir->mask_keyup)))) {
			rc_keydown_notimeout(ir->dev, data, 0);
			rc_keyup(ir->dev);
		}
	}

	return 0;
}

/* --------------------- Chip specific I2C key builders ----------------- */

static int get_key_flydvb_trio(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
{
	int gpio;
	int attempt = 0;
	unsigned char b;

	/* We need this to access GPI Used by the saa_readl macro. */
	struct saa7134_dev *dev = ir->c->adapter->algo_data;

	if (dev == NULL) {
		i2cdprintk("get_key_flydvb_trio: "
			   "ir->c->adapter->algo_data is NULL!\n");
		return -EIO;
	}

	/* rising SAA7134_GPIGPRESCAN reads the status */
	saa_clearb(SAA7134_GPIO_GPMODE3, SAA7134_GPIO_GPRESCAN);
	saa_setb(SAA7134_GPIO_GPMODE3, SAA7134_GPIO_GPRESCAN);

	gpio = saa_readl(SAA7134_GPIO_GPSTATUS0 >> 2);

	if (0x40000 & ~gpio)
		return 0; /* No button press */

	/* No button press - only before first key pressed */
	if (b == 0xFF)
		return 0;

	/* poll IR chip */
	/* weak up the IR chip */
	b = 0;

	while (1 != i2c_master_send(ir->c, &b, 1)) {
		if ((attempt++) < 10) {
			/*
			 * wait a bit for next attempt -
			 * I don't know how make it better
			 */