[deliverable/linux.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 work_struct work;
	struct timer_list timer;
	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 ir_timer(unsigned long data)
{
	struct em28xx_IR *ir = (struct em28xx_IR *)data;

	schedule_work(&ir->work);
}

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

	em28xx_ir_handle_key(ir);
	mod_timer(&ir->timer, jiffies + msecs_to_jiffies(ir->polling));
}

static void em28xx_ir_start(struct em28xx_IR *ir)
{
	setup_timer(&ir->timer, ir_timer, (unsigned long)ir);
	INIT_WORK(&ir->work, em28xx_ir_work);
	schedule_work(&ir->work);
}

static void em28xx_ir_stop(struct em28xx_IR *ir)
{
	del_timer_sync(&ir->timer);
	flush_scheduled_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;
	71	struct work_struct work;
	72	struct timer_list timer;
4b92253a DH	73	unsigned int last_toggle:1;
	74	unsigned int last_readcount;
	75	unsigned int repeat_interval;
a924a499	76
4b92253a	77	int (get_key)(struct em28xx_IR , struct em28xx_ir_poll_result *);
a924a499 MCC	78	};
	79
	80	/**********************************************************
	81	I2C IR based get keycodes - should be used with ir-kbd-i2c
	82	**********************************************************/
d5e52653	83
c8793b03	84	int em28xx_get_key_terratec(struct IR_i2c ir, u32 ir_key, u32 *ir_raw)
e43f14af MR	85	{
	86	unsigned char b;
	87
	88	/* poll IR chip */
6ea54d93	89	if (1 != i2c_master_recv(&ir->c, &b, 1)) {
a924a499	90	i2cdprintk("read error\n");
e43f14af MR	91	return -EIO;
	92	}
	93
	94	/* it seems that 0xFE indicates that a button is still hold
4f9c05aa MCC	95	down, while 0xff indicates that no button is hold
4f9c05aa MCC	96	down. 0xfe sequences are sometimes interrupted by 0xFF */
e43f14af	97
a924a499	98	i2cdprintk("key %02x\n", b);
e43f14af	99
4f9c05aa	100	if (b == 0xff)
e43f14af MR	101	return 0;
e43f14af MR	102
4f9c05aa	103	if (b == 0xfe)
e43f14af MR	104	/* keep old data */
	105	return 1;
	106
	107	*ir_key = b;
	108	*ir_raw = b;
	109	return 1;
	110	}
	111
c8793b03	112	int em28xx_get_key_em_haup(struct IR_i2c ir, u32 ir_key, u32 *ir_raw)
d5e52653 MCC	113	{
	114	unsigned char buf[2];
	115	unsigned char code;
	116
	117	/* poll IR chip */
6ea54d93	118	if (2 != i2c_master_recv(&ir->c, buf, 2))
d5e52653 MCC	119	return -EIO;
	120
	121	/* Does eliminate repeated parity code */
6ea54d93	122	if (buf[1] == 0xff)
d5e52653 MCC	123	return 0;
d5e52653 MCC	124
6ea54d93	125	ir->old = buf[1];
d5e52653 MCC	126
d5e52653 MCC	127	/* Rearranges bits to the right order */
6ea54d93	128	code = ((buf[0]&0x01)<<5) \| /* 0010 0000 */
d5e52653 MCC	129	((buf[0]&0x02)<<3) \| /* 0001 0000 */
	130	((buf[0]&0x04)<<1) \| /* 0000 1000 */
	131	((buf[0]&0x08)>>1) \| /* 0000 0100 */
	132	((buf[0]&0x10)>>3) \| /* 0000 0010 */
	133	((buf[0]&0x20)>>5); /* 0000 0001 */
	134
a924a499	135	i2cdprintk("ir hauppauge (em2840): code=0x%02x (rcv=0x%02x)\n",
6ea54d93	136	code, buf[0]);
d5e52653 MCC	137
	138	/* return key */
	139	*ir_key = code;
	140	*ir_raw = code;
	141	return 1;
	142	}
	143
c8793b03 MCC	144	int em28xx_get_key_pinnacle_usb_grey(struct IR_i2c ir, u32 ir_key,
c8793b03 MCC	145	u32 *ir_raw)
366cc64b MR	146	{
	147	unsigned char buf[3];
	148
	149	/* poll IR chip */
	150
6ea54d93	151	if (3 != i2c_master_recv(&ir->c, buf, 3)) {
a924a499	152	i2cdprintk("read error\n");
366cc64b MR	153	return -EIO;
	154	}
	155
a924a499	156	i2cdprintk("key %02x\n", buf[2]&0x3f);
6ea54d93	157	if (buf[0] != 0x00)
366cc64b	158	return 0;
366cc64b MR	159
	160	*ir_key = buf[2]&0x3f;
	161	*ir_raw = buf[2]&0x3f;
	162
	163	return 1;
	164	}
	165
a924a499 MCC	166	/**********************************************************
	167	Poll based get keycode functions
	168	**********************************************************/
	169
4b92253a DH	170	/* This is for the em2860/em2880 */
	171	static int default_polling_getkey(struct em28xx_IR *ir,
	172	struct em28xx_ir_poll_result *poll_result)
a924a499 MCC	173	{
	174	struct em28xx *dev = ir->dev;
	175	int rc;
4b92253a	176	u8 msg[3] = { 0, 0, 0 };
a924a499	177
0a6b8a85 MCC	178	/* Read key toggle, brand, and key code
	179	on registers 0x45, 0x46 and 0x47
	180	*/
a924a499	181	rc = dev->em28xx_read_reg_req_len(dev, 0, EM28XX_R45_IR,
0a6b8a85	182	msg, sizeof(msg));
a924a499 MCC	183	if (rc < 0)
	184	return rc;
	185
4b92253a DH	186	/* Infrared toggle (Reg 0x45[7]) */
	187	poll_result->toggle_bit = (msg[0] >> 7);
	188
	189	/* Infrared read count (Reg 0x45[6:0] */
	190	poll_result->read_count = (msg[0] & 0x7f);
	191
	192	/* Remote Control Address (Reg 0x46) */
	193	poll_result->rc_address = msg[1];
	194
	195	/* Remote Control Data (Reg 0x47) */
	196	poll_result->rc_data[0] = msg[2];
	197
	198	return 0;
	199	}
	200
	201	static int em2874_polling_getkey(struct em28xx_IR *ir,
	202	struct em28xx_ir_poll_result *poll_result)
	203	{
	204	struct em28xx *dev = ir->dev;
	205	int rc;
	206	u8 msg[5] = { 0, 0, 0, 0, 0 };
	207
	208	/* Read key toggle, brand, and key code
	209	on registers 0x51-55
	210	*/
	211	rc = dev->em28xx_read_reg_req_len(dev, 0, EM2874_R51_IR,
	212	msg, sizeof(msg));
	213	if (rc < 0)
	214	return rc;
	215
	216	/* Infrared toggle (Reg 0x51[7]) */
	217	poll_result->toggle_bit = (msg[0] >> 7);
	218
	219	/* Infrared read count (Reg 0x51[6:0] */
	220	poll_result->read_count = (msg[0] & 0x7f);
	221
	222	/* Remote Control Address (Reg 0x52) */
	223	poll_result->rc_address = msg[1];
	224
	225	/* Remote Control Data (Reg 0x53-55) */
	226	poll_result->rc_data[0] = msg[2];
	227	poll_result->rc_data[1] = msg[3];
	228	poll_result->rc_data[2] = msg[4];
	229
	230	return 0;
a924a499 MCC	231	}
	232
	233	/**********************************************************
	234	Polling code for em28xx
	235	**********************************************************/
	236
	237	static void em28xx_ir_handle_key(struct em28xx_IR *ir)
	238	{
4b92253a DH	239	int result;
	240	int do_sendkey = 0;
	241	struct em28xx_ir_poll_result poll_result;
	242
	243	/* read the registers containing the IR status */
	244	result = ir->get_key(ir, &poll_result);
	245	if (result < 0) {
	246	dprintk("ir->get_key() failed %d\n", result);
a924a499	247	return;
4b92253a	248	}
a924a499	249
4b92253a DH	250	dprintk("ir->get_key result tb=%02x rc=%02x lr=%02x data=%02x\n",
	251	poll_result.toggle_bit, poll_result.read_count,
	252	ir->last_readcount, poll_result.rc_data[0]);
	253
	254	if (ir->dev->chip_id == CHIP_ID_EM2874) {
	255	/* The em2874 clears the readcount field every time the
	256	register is read. The em2860/2880 datasheet says that it
	257	is supposed to clear the readcount, but it doesn't. So with
	258	the em2874, we are looking for a non-zero read count as
	259	opposed to a readcount that is incrementing */
	260	ir->last_readcount = 0;
	261	}
0a6b8a85	262
4b92253a DH	263	if (poll_result.read_count == 0) {
	264	/* The button has not been pressed since the last read */
	265	} else if (ir->last_toggle != poll_result.toggle_bit) {
	266	/* A button has been pressed */
	267	dprintk("button has been pressed\n");
	268	ir->last_toggle = poll_result.toggle_bit;
	269	ir->repeat_interval = 0;
	270	do_sendkey = 1;
	271	} else if (poll_result.toggle_bit == ir->last_toggle &&
	272	poll_result.read_count > 0 &&
	273	poll_result.read_count != ir->last_readcount) {
	274	/* The button is still being held down */
	275	dprintk("button being held down\n");
	276
	277	/* Debouncer for first keypress */
	278	if (ir->repeat_interval++ > 9) {
	279	/* Start repeating after 1 second */
	280	do_sendkey = 1;
0a6b8a85	281	}
4b92253a DH	282	}
	283
	284	if (do_sendkey) {
	285	dprintk("sending keypress\n");
	286	ir_input_keydown(ir->input, &ir->ir, poll_result.rc_data[0],
	287	poll_result.rc_data[0]);
a924a499 MCC	288	ir_input_nokey(ir->input, &ir->ir);
a924a499 MCC	289	}
4b92253a DH	290
	291	ir->last_readcount = poll_result.read_count;
	292	return;
a924a499 MCC	293	}
	294
	295	static void ir_timer(unsigned long data)
	296	{
	297	struct em28xx_IR ir = (struct em28xx_IR )data;
	298
	299	schedule_work(&ir->work);
	300	}
	301
	302	static void em28xx_ir_work(struct work_struct *work)
	303	{
	304	struct em28xx_IR *ir = container_of(work, struct em28xx_IR, work);
	305
	306	em28xx_ir_handle_key(ir);
	307	mod_timer(&ir->timer, jiffies + msecs_to_jiffies(ir->polling));
	308	}
	309
26cdc76b	310	static void em28xx_ir_start(struct em28xx_IR *ir)
a924a499 MCC	311	{
	312	setup_timer(&ir->timer, ir_timer, (unsigned long)ir);
	313	INIT_WORK(&ir->work, em28xx_ir_work);
	314	schedule_work(&ir->work);
	315	}
	316
	317	static void em28xx_ir_stop(struct em28xx_IR *ir)
	318	{
	319	del_timer_sync(&ir->timer);
	320	flush_scheduled_work();
	321	}
	322
	323	int em28xx_ir_init(struct em28xx *dev)
	324	{
	325	struct em28xx_IR *ir;
	326	struct input_dev *input_dev;
4b92253a	327	u8 ir_config;
a924a499 MCC	328	int err = -ENOMEM;
a924a499 MCC	329
505b6d0b	330	if (dev->board.ir_codes == NULL) {
4b92253a DH	331	/* No remote control support */
	332	return 0;
	333	}
	334
a924a499 MCC	335	ir = kzalloc(sizeof(*ir), GFP_KERNEL);
	336	input_dev = input_allocate_device();
	337	if (!ir \|\| !input_dev)
	338	goto err_out_free;
	339
	340	ir->input = input_dev;
	341
4b92253a DH	342	/* Setup the proper handler based on the chip */
	343	switch (dev->chip_id) {
	344	case CHIP_ID_EM2860:
	345	case CHIP_ID_EM2883:
	346	ir->get_key = default_polling_getkey;
91812fa7	347	break;
4b92253a DH	348	case CHIP_ID_EM2874:
	349	ir->get_key = em2874_polling_getkey;
	350	/* For now we only support RC5, so enable it */
	351	ir_config = EM2874_IR_RC5;
	352	em28xx_write_regs(dev, EM2874_R50_IR_CONFIG, &ir_config, 1);
	353	break;
	354	default:
	355	printk("Unrecognized em28xx chip id: IR not supported\n");
a924a499 MCC	356	goto err_out_free;
	357	}
	358
4b92253a DH	359	/* This is how often we ask the chip for IR information */
	360	ir->polling = 100; /* ms */
	361
a924a499 MCC	362	/* init input device */
	363	snprintf(ir->name, sizeof(ir->name), "em28xx IR (%s)",
	364	dev->name);
	365
	366	usb_make_path(dev->udev, ir->phys, sizeof(ir->phys));
	367	strlcat(ir->phys, "/input0", sizeof(ir->phys));
	368
505b6d0b	369	ir_input_init(input_dev, &ir->ir, IR_TYPE_OTHER, dev->board.ir_codes);
a924a499 MCC	370	input_dev->name = ir->name;
	371	input_dev->phys = ir->phys;
	372	input_dev->id.bustype = BUS_USB;
	373	input_dev->id.version = 1;
	374	input_dev->id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
	375	input_dev->id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
	376
	377	input_dev->dev.parent = &dev->udev->dev;
	378	/* record handles to ourself */
	379	ir->dev = dev;
	380	dev->ir = ir;
	381
	382	em28xx_ir_start(ir);
	383
	384	/* all done */
	385	err = input_register_device(ir->input);
	386	if (err)
	387	goto err_out_stop;
	388
	389	return 0;
	390	err_out_stop:
	391	em28xx_ir_stop(ir);
	392	dev->ir = NULL;
	393	err_out_free:
	394	input_free_device(input_dev);
	395	kfree(ir);
	396	return err;
	397	}
	398
	399	int em28xx_ir_fini(struct em28xx *dev)
	400	{
	401	struct em28xx_IR *ir = dev->ir;
	402
	403	/* skip detach on non attached boards */
	404	if (!ir)
	405	return 0;
	406
	407	em28xx_ir_stop(ir);
	408	input_unregister_device(ir->input);
	409	kfree(ir);
	410
	411	/* done */
	412	dev->ir = NULL;
	413	return 0;
	414	}
	415
	416	/**********************************************************
	417	Handle Webcam snapshot button
	418	**********************************************************/
	419
a9fc52bc DH	420	static void em28xx_query_sbutton(struct work_struct *work)
	421	{
	422	/* Poll the register and see if the button is depressed */
	423	struct em28xx *dev =
	424	container_of(work, struct em28xx, sbutton_query_work.work);
	425	int ret;
	426
	427	ret = em28xx_read_reg(dev, EM28XX_R0C_USBSUSP);
	428
	429	if (ret & EM28XX_R0C_USBSUSP_SNAPSHOT) {
	430	u8 cleared;
	431	/* Button is depressed, clear the register */
	432	cleared = ((u8) ret) & ~EM28XX_R0C_USBSUSP_SNAPSHOT;
	433	em28xx_write_regs(dev, EM28XX_R0C_USBSUSP, &cleared, 1);
	434
	435	/* Not emulate the keypress */
	436	input_report_key(dev->sbutton_input_dev, EM28XX_SNAPSHOT_KEY,
	437	1);
	438	/* Now unpress the key */
	439	input_report_key(dev->sbutton_input_dev, EM28XX_SNAPSHOT_KEY,
	440	0);
	441	}
	442
	443	/* Schedule next poll */
	444	schedule_delayed_work(&dev->sbutton_query_work,
	445	msecs_to_jiffies(EM28XX_SBUTTON_QUERY_INTERVAL));
	446	}
	447
	448	void em28xx_register_snapshot_button(struct em28xx *dev)
	449	{
	450	struct input_dev *input_dev;
	451	int err;
	452
	453	em28xx_info("Registering snapshot button...\n");
	454	input_dev = input_allocate_device();
	455	if (!input_dev) {
	456	em28xx_errdev("input_allocate_device failed\n");
	457	return;
	458	}
	459
	460	usb_make_path(dev->udev, dev->snapshot_button_path,
	461	sizeof(dev->snapshot_button_path));
	462	strlcat(dev->snapshot_button_path, "/sbutton",
	463	sizeof(dev->snapshot_button_path));
	464	INIT_DELAYED_WORK(&dev->sbutton_query_work, em28xx_query_sbutton);
	465
	466	input_dev->name = "em28xx snapshot button";
	467	input_dev->phys = dev->snapshot_button_path;
	468	input_dev->evbit[0] = BIT_MASK(EV_KEY) \| BIT_MASK(EV_REP);
	469	set_bit(EM28XX_SNAPSHOT_KEY, input_dev->keybit);
	470	input_dev->keycodesize = 0;
	471	input_dev->keycodemax = 0;
	472	input_dev->id.bustype = BUS_USB;
	473	input_dev->id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
	474	input_dev->id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
	475	input_dev->id.version = 1;
	476	input_dev->dev.parent = &dev->udev->dev;
	477
	478	err = input_register_device(input_dev);
	479	if (err) {
	480	em28xx_errdev("input_register_device failed\n");
	481	input_free_device(input_dev);
	482	return;
	483	}
484
485	dev->sbutton_input_dev = input_dev;
486	schedule_delayed_work(&dev->sbutton_query_work,
487	msecs_to_jiffies(EM28XX_SBUTTON_QUERY_INTERVAL));
488	return;
489
490	}
491
492	void em28xx_deregister_snapshot_button(struct em28xx *dev)
493	{
494	if (dev->sbutton_input_dev != NULL) {
495	em28xx_info("Deregistering snapshot button\n");
496	cancel_rearming_delayed_work(&dev->sbutton_query_work);
497	input_unregister_device(dev->sbutton_input_dev);
498	dev->sbutton_input_dev = NULL;
499	}
500	return;
501	}