[linux-2.6-block.git] / drivers / media / video / em28xx / em28xx-input.c

/*
  handle em28xx IR remotes via linux kernel input layer.

   Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
		      Markus Rechberger <mrechberger@gmail.com>
		      Mauro Carvalho Chehab <mchehab@infradead.org>
		      Sascha Sommer <saschasommer@freenet.de>

  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/input.h>
#include <linux/usb.h>

#include "em28xx.h"

#define EM28XX_SNAPSHOT_KEY KEY_CAMERA
#define EM28XX_SBUTTON_QUERY_INTERVAL 500
#define EM28XX_R0C_USBSUSP_SNAPSHOT 0x20

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

#define i2cdprintk(fmt, arg...) \
	if (ir_debug) { \
		printk(KERN_DEBUG "%s/ir: " fmt, ir->c.name , ## arg); \
	}

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

/**********************************************************
 Polling structure used by em28xx IR's
 **********************************************************/

struct em28xx_ir_poll_result {
	unsigned int toggle_bit:1;
	unsigned int read_count:7;
	u8 rc_address;
	u8 rc_data[4]; /* 1 byte on em2860/2880, 4 on em2874 */
};

struct em28xx_IR {
	struct em28xx *dev;
	struct input_dev *input;
	struct ir_input_state ir;
	char name[32];
	char phys[32];

	/* poll external decoder */
	int polling;
	struct delayed_work work;
	unsigned int last_toggle:1;
	unsigned int last_readcount;
	unsigned int repeat_interval;

	int  (*get_key)(struct em28xx_IR *, struct em28xx_ir_poll_result *);
};

/**********************************************************
 I2C IR based get keycodes - should be used with ir-kbd-i2c
 **********************************************************/

int em28xx_get_key_terratec(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
{
	unsigned char b;

	/* poll IR chip */
	if (1 != i2c_master_recv(&ir->c, &b, 1)) {
		i2cdprintk("read error\n");
		return -EIO;
	}

	/* it seems that 0xFE indicates that a button is still hold
	   down, while 0xff indicates that no button is hold
	   down. 0xfe sequences are sometimes interrupted by 0xFF */

	i2cdprintk("key %02x\n", b);

	if (b == 0xff)
		return 0;

	if (b == 0xfe)
		/* keep old data */
		return 1;

	*ir_key = b;
	*ir_raw = b;
	return 1;
}

int em28xx_get_key_em_haup(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
{
	unsigned char buf[2];
	unsigned char code;

	/* poll IR chip */
	if (2 != i2c_master_recv(&ir->c, buf, 2))
		return -EIO;

	/* Does eliminate repeated parity code */
	if (buf[1] == 0xff)
		return 0;

	ir->old = buf[1];

	/* Rearranges bits to the right order */
	code =   ((buf[0]&0x01)<<5) | /* 0010 0000 */
		 ((buf[0]&0x02)<<3) | /* 0001 0000 */
		 ((buf[0]&0x04)<<1) | /* 0000 1000 */
		 ((buf[0]&0x08)>>1) | /* 0000 0100 */
		 ((buf[0]&0x10)>>3) | /* 0000 0010 */
		 ((buf[0]&0x20)>>5);  /* 0000 0001 */

	i2cdprintk("ir hauppauge (em2840): code=0x%02x (rcv=0x%02x)\n",
			code, buf[0]);

	/* return key */
	*ir_key = code;
	*ir_raw = code;
	return 1;
}

int em28xx_get_key_pinnacle_usb_grey(struct IR_i2c *ir, u32 *ir_key,
				     u32 *ir_raw)
{
	unsigned char buf[3];

	/* poll IR chip */

	if (3 != i2c_master_recv(&ir->c, buf, 3)) {
		i2cdprintk("read error\n");
		return -EIO;
	}

	i2cdprintk("key %02x\n", buf[2]&0x3f);
	if (buf[0] != 0x00)
		return 0;

	*ir_key = buf[2]&0x3f;
	*ir_raw = buf[2]&0x3f;

	return 1;
}

/**********************************************************
 Poll based get keycode functions
 **********************************************************/

/* This is for the em2860/em2880 */
static int default_polling_getkey(struct em28xx_IR *ir,
				  struct em28xx_ir_poll_result *poll_result)
{
	struct em28xx *dev = ir->dev;
	int rc;
	u8 msg[3] = { 0, 0, 0 };

	/* Read key toggle, brand, and key code
	   on registers 0x45, 0x46 and 0x47
	 */
	rc = dev->em28xx_read_reg_req_len(dev, 0, EM28XX_R45_IR,
					  msg, sizeof(msg));
	if (rc < 0)
		return rc;

	/* Infrared toggle (Reg 0x45[7]) */
	poll_result->toggle_bit = (msg[0] >> 7);

	/* Infrared read count (Reg 0x45[6:0] */
	poll_result->read_count = (msg[0] & 0x7f);

	/* Remote Control Address (Reg 0x46) */
	poll_result->rc_address = msg[1];

	/* Remote Control Data (Reg 0x47) */
	poll_result->rc_data[0] = msg[2];

	return 0;
}

static int em2874_polling_getkey(struct em28xx_IR *ir,
				 struct em28xx_ir_poll_result *poll_result)
{
	struct em28xx *dev = ir->dev;
	int rc;
	u8 msg[5] = { 0, 0, 0, 0, 0 };

	/* Read key toggle, brand, and key code
	   on registers 0x51-55
	 */
	rc = dev->em28xx_read_reg_req_len(dev, 0, EM2874_R51_IR,
					  msg, sizeof(msg));
	if (rc < 0)
		return rc;

	/* Infrared toggle (Reg 0x51[7]) */
	poll_result->toggle_bit = (msg[0] >> 7);

	/* Infrared read count (Reg 0x51[6:0] */
	poll_result->read_count = (msg[0] & 0x7f);

	/* Remote Control Address (Reg 0x52) */
	poll_result->rc_address = msg[1];

	/* Remote Control Data (Reg 0x53-55) */
	poll_result->rc_data[0] = msg[2];
	poll_result->rc_data[1] = msg[3];
	poll_result->rc_data[2] = msg[4];

	return 0;
}

/**********************************************************
 Polling code for em28xx
 **********************************************************/

static void em28xx_ir_handle_key(struct em28xx_IR *ir)
{
	int result;
	int do_sendkey = 0;
	struct em28xx_ir_poll_result poll_result;

	/* read the registers containing the IR status */
	result = ir->get_key(ir, &poll_result);
	if (result < 0) {
		dprintk("ir->get_key() failed %d\n", result);
		return;
	}

	dprintk("ir->get_key result tb=%02x rc=%02x lr=%02x data=%02x\n",
		poll_result.toggle_bit, poll_result.read_count,
		ir->last_readcount, poll_result.rc_data[0]);

	if (ir->dev->chip_id == CHIP_ID_EM2874) {
		/* The em2874 clears the readcount field every time the
		   register is read.  The em2860/2880 datasheet says that it
		   is supposed to clear the readcount, but it doesn't.  So with
		   the em2874, we are looking for a non-zero read count as
		   opposed to a readcount that is incrementing */
		ir->last_readcount = 0;
	}

	if (poll_result.read_count == 0) {
		/* The button has not been pressed since the last read */
	} else if (ir->last_toggle != poll_result.toggle_bit) {
		/* A button has been pressed */
		dprintk("button has been pressed\n");
		ir->last_toggle = poll_result.toggle_bit;
		ir->repeat_interval = 0;
		do_sendkey = 1;
	} else if (poll_result.toggle_bit == ir->last_toggle &&
		   poll_result.read_count > 0 &&
		   poll_result.read_count != ir->last_readcount) {
		/* The button is still being held down */
		dprintk("button being held down\n");

		/* Debouncer for first keypress */
		if (ir->repeat_interval++ > 9) {
			/* Start repeating after 1 second */
			do_sendkey = 1;
		}
	}

	if (do_sendkey) {
		dprintk("sending keypress\n");
		ir_input_keydown(ir->input, &ir->ir, poll_result.rc_data[0],
				 poll_result.rc_data[0]);
		ir_input_nokey(ir->input, &ir->ir);
	}

	ir->last_readcount = poll_result.read_count;
	return;
}

static void em28xx_ir_work(struct work_struct *work)
{
	struct em28xx_IR *ir = container_of(work, struct em28xx_IR, work.work);

	em28xx_ir_handle_key(ir);
	schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
}

static void em28xx_ir_start(struct em28xx_IR *ir)
{
	INIT_DELAYED_WORK(&ir->work, em28xx_ir_work);
	schedule_delayed_work(&ir->work, 0);
}

static void em28xx_ir_stop(struct em28xx_IR *ir)
{
	cancel_delayed_work_sync(&ir->work);
}

int em28xx_ir_init(struct em28xx *dev)
{
	struct em28xx_IR *ir;
	struct input_dev *input_dev;
	u8 ir_config;
	int err = -ENOMEM;

	if (dev->board.ir_codes == NULL) {
		/* No remote control support */
		return 0;
	}

	ir = kzalloc(sizeof(*ir), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!ir || !input_dev)
		goto err_out_free;

	ir->input = input_dev;

	/* Setup the proper handler based on the chip */
	switch (dev->chip_id) {
	case CHIP_ID_EM2860:
	case CHIP_ID_EM2883:
		ir->get_key = default_polling_getkey;
		break;
	case CHIP_ID_EM2874:
		ir->get_key = em2874_polling_getkey;
		/* For now we only support RC5, so enable it */
		ir_config = EM2874_IR_RC5;
		em28xx_write_regs(dev, EM2874_R50_IR_CONFIG, &ir_config, 1);
		break;
	default:
		printk("Unrecognized em28xx chip id: IR not supported\n");
		goto err_out_free;
	}

	/* This is how often we ask the chip for IR information */
	ir->polling = 100; /* ms */

	/* init input device */
	snprintf(ir->name, sizeof(ir->name), "em28xx IR (%s)",
						dev->name);

	usb_make_path(dev->udev, ir->phys, sizeof(ir->phys));
	strlcat(ir->phys, "/input0", sizeof(ir->phys));

	ir_input_init(input_dev, &ir->ir, IR_TYPE_OTHER, dev->board.ir_codes);
	input_dev->name = ir->name;
	input_dev->phys = ir->phys;
	input_dev->id.bustype = BUS_USB;
	input_dev->id.version = 1;
	input_dev->id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
	input_dev->id.product = le16_to_cpu(dev->udev->descriptor.idProduct);

	input_dev->dev.parent = &dev->udev->dev;
	/* record handles to ourself */
	ir->dev = dev;
	dev->ir = ir;

	em28xx_ir_start(ir);

	/* all done */
	err = input_register_device(ir->input);
	if (err)
		goto err_out_stop;

	return 0;
 err_out_stop:
	em28xx_ir_stop(ir);
	dev->ir = NULL;
 err_out_free:
	input_free_device(input_dev);
	kfree(ir);
	return err;
}

int em28xx_ir_fini(struct em28xx *dev)
{
	struct em28xx_IR *ir = dev->ir;

	/* skip detach on non attached boards */
	if (!ir)
		return 0;

	em28xx_ir_stop(ir);
	input_unregister_device(ir->input);
	kfree(ir);

	/* done */
	dev->ir = NULL;
	return 0;
}

/**********************************************************
 Handle Webcam snapshot button
 **********************************************************/

static void em28xx_query_sbutton(struct work_struct *work)
{
	/* Poll the register and see if the button is depressed */
	struct em28xx *dev =
		container_of(work, struct em28xx, sbutton_query_work.work);
	int ret;

	ret = em28xx_read_reg(dev, EM28XX_R0C_USBSUSP);

	if (ret & EM28XX_R0C_USBSUSP_SNAPSHOT) {
		u8 cleared;
		/* Button is depressed, clear the register */
		cleared = ((u8) ret) & ~EM28XX_R0C_USBSUSP_SNAPSHOT;
		em28xx_write_regs(dev, EM28XX_R0C_USBSUSP, &cleared, 1);

		/* Not emulate the keypress */
		input_report_key(dev->sbutton_input_dev, EM28XX_SNAPSHOT_KEY,
				 1);
		/* Now unpress the key */
		input_report_key(dev->sbutton_input_dev, EM28XX_SNAPSHOT_KEY,
				 0);
	}

	/* Schedule next poll */
	schedule_delayed_work(&dev->sbutton_query_work,
			      msecs_to_jiffies(EM28XX_SBUTTON_QUERY_INTERVAL));
}

void em28xx_register_snapshot_button(struct em28xx *dev)
{
	struct input_dev *input_dev;
	int err;

	em28xx_info("Registering snapshot button...\n");
	input_dev = input_allocate_device();
	if (!input_dev) {
		em28xx_errdev("input_allocate_device failed\n");
		return;
	}

	usb_make_path(dev->udev, dev->snapshot_button_path,
		      sizeof(dev->snapshot_button_path));
	strlcat(dev->snapshot_button_path, "/sbutton",
		sizeof(dev->snapshot_button_path));
	INIT_DELAYED_WORK(&dev->sbutton_query_work, em28xx_query_sbutton);

	input_dev->name = "em28xx snapshot button";
	input_dev->phys = dev->snapshot_button_path;
	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
	set_bit(EM28XX_SNAPSHOT_KEY, input_dev->keybit);
	input_dev->keycodesize = 0;
	input_dev->keycodemax = 0;
	input_dev->id.bustype = BUS_USB;
	input_dev->id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
	input_dev->id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
	input_dev->id.version = 1;
	input_dev->dev.parent = &dev->udev->dev;

	err = input_register_device(input_dev);
	if (err) {
		em28xx_errdev("input_register_device failed\n");
		input_free_device(input_dev);
		return;
	}

	dev->sbutton_input_dev = input_dev;
	schedule_delayed_work(&dev->sbutton_query_work,
			      msecs_to_jiffies(EM28XX_SBUTTON_QUERY_INTERVAL));
	return;

}

void em28xx_deregister_snapshot_button(struct em28xx *dev)
{
	if (dev->sbutton_input_dev != NULL) {
		em28xx_info("Deregistering snapshot button\n");
		cancel_rearming_delayed_work(&dev->sbutton_query_work);
		input_unregister_device(dev->sbutton_input_dev);
		dev->sbutton_input_dev = NULL;
	}
	return;
}
Commit	Line	Data
d5e52653	1	/*
f7abcd38 MCC	2	handle em28xx IR remotes via linux kernel input layer.
	3
	4	Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
	5	Markus Rechberger <mrechberger@gmail.com>
2e7c6dc3	6	Mauro Carvalho Chehab <mchehab@infradead.org>
f7abcd38 MCC	7	Sascha Sommer <saschasommer@freenet.de>
	8
	9	This program is free software; you can redistribute it and/or modify
	10	it under the terms of the GNU General Public License as published by
	11	the Free Software Foundation; either version 2 of the License, or
	12	(at your option) any later version.
	13
	14	This program is distributed in the hope that it will be useful,
	15	but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	GNU General Public License for more details.
	18
	19	You should have received a copy of the GNU General Public License
	20	along with this program; if not, write to the Free Software
	21	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
d5e52653 MCC	22	*/
	23
	24	#include <linux/module.h>
d5e52653 MCC	25	#include <linux/init.h>
d5e52653 MCC	26	#include <linux/delay.h>
d5e52653 MCC	27	#include <linux/interrupt.h>
	28	#include <linux/input.h>
	29	#include <linux/usb.h>
	30
f7abcd38	31	#include "em28xx.h"
d5e52653	32
a9fc52bc DH	33	#define EM28XX_SNAPSHOT_KEY KEY_CAMERA
	34	#define EM28XX_SBUTTON_QUERY_INTERVAL 500
	35	#define EM28XX_R0C_USBSUSP_SNAPSHOT 0x20
	36
c8793b03	37	static unsigned int ir_debug;
d5e52653	38	module_param(ir_debug, int, 0644);
6ea54d93	39	MODULE_PARM_DESC(ir_debug, "enable debug messages [IR]");
d5e52653	40
a924a499	41	#define i2cdprintk(fmt, arg...) \
6ea54d93 DSL	42	if (ir_debug) { \
	43	printk(KERN_DEBUG "%s/ir: " fmt, ir->c.name , ## arg); \
	44	}
d5e52653	45
a924a499 MCC	46	#define dprintk(fmt, arg...) \
	47	if (ir_debug) { \
	48	printk(KERN_DEBUG "%s/ir: " fmt, ir->name , ## arg); \
	49	}
	50
	51	/**********************************************************
	52	Polling structure used by em28xx IR's
	53	**********************************************************/
	54
4b92253a DH	55	struct em28xx_ir_poll_result {
	56	unsigned int toggle_bit:1;
	57	unsigned int read_count:7;
	58	u8 rc_address;
	59	u8 rc_data[4]; /* 1 byte on em2860/2880, 4 on em2874 */
	60	};
	61
a924a499 MCC	62	struct em28xx_IR {
	63	struct em28xx *dev;
	64	struct input_dev *input;
	65	struct ir_input_state ir;
	66	char name[32];
	67	char phys[32];
	68
	69	/* poll external decoder */
	70	int polling;
f263bac9	71	struct delayed_work work;
4b92253a DH	72	unsigned int last_toggle:1;
	73	unsigned int last_readcount;
	74	unsigned int repeat_interval;
a924a499	75
4b92253a	76	int (get_key)(struct em28xx_IR , struct em28xx_ir_poll_result *);
a924a499 MCC	77	};
	78
	79	/**********************************************************
	80	I2C IR based get keycodes - should be used with ir-kbd-i2c
	81	**********************************************************/
d5e52653	82
c8793b03	83	int em28xx_get_key_terratec(struct IR_i2c ir, u32 ir_key, u32 *ir_raw)
e43f14af MR	84	{
	85	unsigned char b;
	86
	87	/* poll IR chip */
6ea54d93	88	if (1 != i2c_master_recv(&ir->c, &b, 1)) {
a924a499	89	i2cdprintk("read error\n");
e43f14af MR	90	return -EIO;
	91	}
	92
	93	/* it seems that 0xFE indicates that a button is still hold
4f9c05aa MCC	94	down, while 0xff indicates that no button is hold
4f9c05aa MCC	95	down. 0xfe sequences are sometimes interrupted by 0xFF */
e43f14af	96
a924a499	97	i2cdprintk("key %02x\n", b);
e43f14af	98
4f9c05aa	99	if (b == 0xff)
e43f14af MR	100	return 0;
e43f14af MR	101
4f9c05aa	102	if (b == 0xfe)
e43f14af MR	103	/* keep old data */
	104	return 1;
	105
	106	*ir_key = b;
	107	*ir_raw = b;
	108	return 1;
	109	}
	110
c8793b03	111	int em28xx_get_key_em_haup(struct IR_i2c ir, u32 ir_key, u32 *ir_raw)
d5e52653 MCC	112	{
	113	unsigned char buf[2];
	114	unsigned char code;
	115
	116	/* poll IR chip */
6ea54d93	117	if (2 != i2c_master_recv(&ir->c, buf, 2))
d5e52653 MCC	118	return -EIO;
	119
	120	/* Does eliminate repeated parity code */
6ea54d93	121	if (buf[1] == 0xff)
d5e52653 MCC	122	return 0;
d5e52653 MCC	123
6ea54d93	124	ir->old = buf[1];
d5e52653 MCC	125
d5e52653 MCC	126	/* Rearranges bits to the right order */
6ea54d93	127	code = ((buf[0]&0x01)<<5) \| /* 0010 0000 */
d5e52653 MCC	128	((buf[0]&0x02)<<3) \| /* 0001 0000 */
	129	((buf[0]&0x04)<<1) \| /* 0000 1000 */
	130	((buf[0]&0x08)>>1) \| /* 0000 0100 */
	131	((buf[0]&0x10)>>3) \| /* 0000 0010 */
	132	((buf[0]&0x20)>>5); /* 0000 0001 */
	133
a924a499	134	i2cdprintk("ir hauppauge (em2840): code=0x%02x (rcv=0x%02x)\n",
6ea54d93	135	code, buf[0]);
d5e52653 MCC	136
	137	/* return key */
	138	*ir_key = code;
	139	*ir_raw = code;
	140	return 1;
	141	}
	142
c8793b03 MCC	143	int em28xx_get_key_pinnacle_usb_grey(struct IR_i2c ir, u32 ir_key,
c8793b03 MCC	144	u32 *ir_raw)
366cc64b MR	145	{
	146	unsigned char buf[3];
	147
	148	/* poll IR chip */
	149
6ea54d93	150	if (3 != i2c_master_recv(&ir->c, buf, 3)) {
a924a499	151	i2cdprintk("read error\n");
366cc64b MR	152	return -EIO;
	153	}
	154
a924a499	155	i2cdprintk("key %02x\n", buf[2]&0x3f);
6ea54d93	156	if (buf[0] != 0x00)
366cc64b	157	return 0;
366cc64b MR	158
	159	*ir_key = buf[2]&0x3f;
	160	*ir_raw = buf[2]&0x3f;
	161
	162	return 1;
	163	}
	164
a924a499 MCC	165	/**********************************************************
	166	Poll based get keycode functions
	167	**********************************************************/
	168
4b92253a DH	169	/* This is for the em2860/em2880 */
	170	static int default_polling_getkey(struct em28xx_IR *ir,
	171	struct em28xx_ir_poll_result *poll_result)
a924a499 MCC	172	{
	173	struct em28xx *dev = ir->dev;
	174	int rc;
4b92253a	175	u8 msg[3] = { 0, 0, 0 };
a924a499	176
0a6b8a85 MCC	177	/* Read key toggle, brand, and key code
	178	on registers 0x45, 0x46 and 0x47
	179	*/
a924a499	180	rc = dev->em28xx_read_reg_req_len(dev, 0, EM28XX_R45_IR,
0a6b8a85	181	msg, sizeof(msg));
a924a499 MCC	182	if (rc < 0)
	183	return rc;
	184
4b92253a DH	185	/* Infrared toggle (Reg 0x45[7]) */
	186	poll_result->toggle_bit = (msg[0] >> 7);
	187
	188	/* Infrared read count (Reg 0x45[6:0] */
	189	poll_result->read_count = (msg[0] & 0x7f);
	190
	191	/* Remote Control Address (Reg 0x46) */
	192	poll_result->rc_address = msg[1];
	193
	194	/* Remote Control Data (Reg 0x47) */
	195	poll_result->rc_data[0] = msg[2];
	196
	197	return 0;
	198	}
	199
	200	static int em2874_polling_getkey(struct em28xx_IR *ir,
	201	struct em28xx_ir_poll_result *poll_result)
	202	{
	203	struct em28xx *dev = ir->dev;
	204	int rc;
	205	u8 msg[5] = { 0, 0, 0, 0, 0 };
	206
	207	/* Read key toggle, brand, and key code
	208	on registers 0x51-55
	209	*/
	210	rc = dev->em28xx_read_reg_req_len(dev, 0, EM2874_R51_IR,
	211	msg, sizeof(msg));
	212	if (rc < 0)
	213	return rc;
	214
	215	/* Infrared toggle (Reg 0x51[7]) */
	216	poll_result->toggle_bit = (msg[0] >> 7);
	217
	218	/* Infrared read count (Reg 0x51[6:0] */
	219	poll_result->read_count = (msg[0] & 0x7f);
	220
	221	/* Remote Control Address (Reg 0x52) */
	222	poll_result->rc_address = msg[1];
	223
	224	/* Remote Control Data (Reg 0x53-55) */
	225	poll_result->rc_data[0] = msg[2];
	226	poll_result->rc_data[1] = msg[3];
	227	poll_result->rc_data[2] = msg[4];
	228
	229	return 0;
a924a499 MCC	230	}
	231
	232	/**********************************************************
	233	Polling code for em28xx
	234	**********************************************************/
	235
	236	static void em28xx_ir_handle_key(struct em28xx_IR *ir)
	237	{
4b92253a DH	238	int result;
	239	int do_sendkey = 0;
	240	struct em28xx_ir_poll_result poll_result;
	241
	242	/* read the registers containing the IR status */
	243	result = ir->get_key(ir, &poll_result);
	244	if (result < 0) {
	245	dprintk("ir->get_key() failed %d\n", result);
a924a499	246	return;
4b92253a	247	}
a924a499	248
4b92253a DH	249	dprintk("ir->get_key result tb=%02x rc=%02x lr=%02x data=%02x\n",
	250	poll_result.toggle_bit, poll_result.read_count,
	251	ir->last_readcount, poll_result.rc_data[0]);
	252
	253	if (ir->dev->chip_id == CHIP_ID_EM2874) {
	254	/* The em2874 clears the readcount field every time the
	255	register is read. The em2860/2880 datasheet says that it
	256	is supposed to clear the readcount, but it doesn't. So with
	257	the em2874, we are looking for a non-zero read count as
	258	opposed to a readcount that is incrementing */
	259	ir->last_readcount = 0;
	260	}
0a6b8a85	261
4b92253a DH	262	if (poll_result.read_count == 0) {
	263	/* The button has not been pressed since the last read */
	264	} else if (ir->last_toggle != poll_result.toggle_bit) {
	265	/* A button has been pressed */
	266	dprintk("button has been pressed\n");
	267	ir->last_toggle = poll_result.toggle_bit;
	268	ir->repeat_interval = 0;
	269	do_sendkey = 1;
	270	} else if (poll_result.toggle_bit == ir->last_toggle &&
	271	poll_result.read_count > 0 &&
	272	poll_result.read_count != ir->last_readcount) {
	273	/* The button is still being held down */
	274	dprintk("button being held down\n");
	275
	276	/* Debouncer for first keypress */
	277	if (ir->repeat_interval++ > 9) {
	278	/* Start repeating after 1 second */
	279	do_sendkey = 1;
0a6b8a85	280	}
4b92253a DH	281	}
	282
	283	if (do_sendkey) {
	284	dprintk("sending keypress\n");
	285	ir_input_keydown(ir->input, &ir->ir, poll_result.rc_data[0],
	286	poll_result.rc_data[0]);
a924a499 MCC	287	ir_input_nokey(ir->input, &ir->ir);
a924a499 MCC	288	}
4b92253a DH	289
	290	ir->last_readcount = poll_result.read_count;
	291	return;
a924a499 MCC	292	}
a924a499 MCC	293
a924a499 MCC	294	static void em28xx_ir_work(struct work_struct *work)
a924a499 MCC	295	{
f263bac9	296	struct em28xx_IR *ir = container_of(work, struct em28xx_IR, work.work);
a924a499 MCC	297
a924a499 MCC	298	em28xx_ir_handle_key(ir);
f263bac9	299	schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
a924a499 MCC	300	}
a924a499 MCC	301
26cdc76b	302	static void em28xx_ir_start(struct em28xx_IR *ir)
a924a499	303	{
f263bac9 JD	304	INIT_DELAYED_WORK(&ir->work, em28xx_ir_work);
f263bac9 JD	305	schedule_delayed_work(&ir->work, 0);
a924a499 MCC	306	}
	307
	308	static void em28xx_ir_stop(struct em28xx_IR *ir)
	309	{
f263bac9	310	cancel_delayed_work_sync(&ir->work);
a924a499 MCC	311	}
	312
	313	int em28xx_ir_init(struct em28xx *dev)
	314	{
	315	struct em28xx_IR *ir;
	316	struct input_dev *input_dev;
4b92253a	317	u8 ir_config;
a924a499 MCC	318	int err = -ENOMEM;
a924a499 MCC	319
505b6d0b	320	if (dev->board.ir_codes == NULL) {
4b92253a DH	321	/* No remote control support */
	322	return 0;
	323	}
	324
a924a499 MCC	325	ir = kzalloc(sizeof(*ir), GFP_KERNEL);
	326	input_dev = input_allocate_device();
	327	if (!ir \|\| !input_dev)
	328	goto err_out_free;
	329
	330	ir->input = input_dev;
	331
4b92253a DH	332	/* Setup the proper handler based on the chip */
	333	switch (dev->chip_id) {
	334	case CHIP_ID_EM2860:
	335	case CHIP_ID_EM2883:
	336	ir->get_key = default_polling_getkey;
91812fa7	337	break;
4b92253a DH	338	case CHIP_ID_EM2874:
	339	ir->get_key = em2874_polling_getkey;
	340	/* For now we only support RC5, so enable it */
	341	ir_config = EM2874_IR_RC5;
	342	em28xx_write_regs(dev, EM2874_R50_IR_CONFIG, &ir_config, 1);
	343	break;
	344	default:
	345	printk("Unrecognized em28xx chip id: IR not supported\n");
a924a499 MCC	346	goto err_out_free;
	347	}
	348
4b92253a DH	349	/* This is how often we ask the chip for IR information */
	350	ir->polling = 100; /* ms */
	351
a924a499 MCC	352	/* init input device */
	353	snprintf(ir->name, sizeof(ir->name), "em28xx IR (%s)",
	354	dev->name);
	355
	356	usb_make_path(dev->udev, ir->phys, sizeof(ir->phys));
	357	strlcat(ir->phys, "/input0", sizeof(ir->phys));
	358
505b6d0b	359	ir_input_init(input_dev, &ir->ir, IR_TYPE_OTHER, dev->board.ir_codes);
a924a499 MCC	360	input_dev->name = ir->name;
	361	input_dev->phys = ir->phys;
	362	input_dev->id.bustype = BUS_USB;
	363	input_dev->id.version = 1;
	364	input_dev->id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
	365	input_dev->id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
	366
	367	input_dev->dev.parent = &dev->udev->dev;
	368	/* record handles to ourself */
	369	ir->dev = dev;
	370	dev->ir = ir;
	371
	372	em28xx_ir_start(ir);
	373
	374	/* all done */
	375	err = input_register_device(ir->input);
	376	if (err)
	377	goto err_out_stop;
	378
	379	return 0;
	380	err_out_stop:
	381	em28xx_ir_stop(ir);
	382	dev->ir = NULL;
	383	err_out_free:
	384	input_free_device(input_dev);
	385	kfree(ir);
	386	return err;
	387	}
	388
	389	int em28xx_ir_fini(struct em28xx *dev)
	390	{
	391	struct em28xx_IR *ir = dev->ir;
	392
	393	/* skip detach on non attached boards */
	394	if (!ir)
	395	return 0;
	396
	397	em28xx_ir_stop(ir);
	398	input_unregister_device(ir->input);
	399	kfree(ir);
	400
	401	/* done */
	402	dev->ir = NULL;
	403	return 0;
	404	}
	405
	406	/**********************************************************
	407	Handle Webcam snapshot button
	408	**********************************************************/
	409
a9fc52bc DH	410	static void em28xx_query_sbutton(struct work_struct *work)
	411	{
	412	/* Poll the register and see if the button is depressed */
	413	struct em28xx *dev =
	414	container_of(work, struct em28xx, sbutton_query_work.work);
	415	int ret;
	416
	417	ret = em28xx_read_reg(dev, EM28XX_R0C_USBSUSP);
	418
	419	if (ret & EM28XX_R0C_USBSUSP_SNAPSHOT) {
	420	u8 cleared;
	421	/* Button is depressed, clear the register */
	422	cleared = ((u8) ret) & ~EM28XX_R0C_USBSUSP_SNAPSHOT;
	423	em28xx_write_regs(dev, EM28XX_R0C_USBSUSP, &cleared, 1);
	424
	425	/* Not emulate the keypress */
	426	input_report_key(dev->sbutton_input_dev, EM28XX_SNAPSHOT_KEY,
	427	1);
	428	/* Now unpress the key */
	429	input_report_key(dev->sbutton_input_dev, EM28XX_SNAPSHOT_KEY,
	430	0);
	431	}
	432
	433	/* Schedule next poll */
	434	schedule_delayed_work(&dev->sbutton_query_work,
	435	msecs_to_jiffies(EM28XX_SBUTTON_QUERY_INTERVAL));
	436	}
	437
	438	void em28xx_register_snapshot_button(struct em28xx *dev)
	439	{
	440	struct input_dev *input_dev;
	441	int err;
	442
	443	em28xx_info("Registering snapshot button...\n");
	444	input_dev = input_allocate_device();
	445	if (!input_dev) {
	446	em28xx_errdev("input_allocate_device failed\n");
	447	return;
	448	}
	449
	450	usb_make_path(dev->udev, dev->snapshot_button_path,
	451	sizeof(dev->snapshot_button_path));
	452	strlcat(dev->snapshot_button_path, "/sbutton",
	453	sizeof(dev->snapshot_button_path));
	454	INIT_DELAYED_WORK(&dev->sbutton_query_work, em28xx_query_sbutton);
	455
	456	input_dev->name = "em28xx snapshot button";
	457	input_dev->phys = dev->snapshot_button_path;
	458	input_dev->evbit[0] = BIT_MASK(EV_KEY) \| BIT_MASK(EV_REP);
	459	set_bit(EM28XX_SNAPSHOT_KEY, input_dev->keybit);
	460	input_dev->keycodesize = 0;
	461	input_dev->keycodemax = 0;
	462	input_dev->id.bustype = BUS_USB;
	463	input_dev->id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
	464	input_dev->id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
	465	input_dev->id.version = 1;
	466	input_dev->dev.parent = &dev->udev->dev;
	467
	468	err = input_register_device(input_dev);
	469	if (err) {
	470	em28xx_errdev("input_register_device failed\n");
	471	input_free_device(input_dev);
	472	return;
	473	}
474
475	dev->sbutton_input_dev = input_dev;
476	schedule_delayed_work(&dev->sbutton_query_work,
477	msecs_to_jiffies(EM28XX_SBUTTON_QUERY_INTERVAL));
478	return;
479
480	}
481
482	void em28xx_deregister_snapshot_button(struct em28xx *dev)
483	{
484	if (dev->sbutton_input_dev != NULL) {
485	em28xx_info("Deregistering snapshot button\n");
486	cancel_rearming_delayed_work(&dev->sbutton_query_work);
487	input_unregister_device(dev->sbutton_input_dev);
488	dev->sbutton_input_dev = NULL;
489	}
490	return;
491	}