drivers/media/usb/em28xx/em28xx-input.c - kernel/msm-4.9 - Gitiles

 /*
   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/usb.h>
 #include <linux/slab.h>

 #include "em28xx.h"

 #define EM28XX_SNAPSHOT_KEY KEY_CAMERA
 #define EM28XX_SBUTTON_QUERY_INTERVAL 500

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

 #define MODULE_NAME "em28xx"

 #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;

 	u32 scancode;
 };

 struct em28xx_IR {
 	struct em28xx *dev;
 	struct rc_dev *rc;
 	char name[32];
 	char phys[32];

 	/* poll decoder */
 	int polling;
 	struct delayed_work work;
 	unsigned int full_code:1;
 	unsigned int last_readcount;
 	u64 rc_type;

 	/* i2c slave address of external device (if used) */
 	u16 i2c_dev_addr;

 	int  (*get_key_i2c)(struct i2c_client *, u32 *);
 	int  (*get_key)(struct em28xx_IR *, struct em28xx_ir_poll_result *);
 };

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

 static int em28xx_get_key_terratec(struct i2c_client *i2c_dev, u32 *ir_key)
 {
 	unsigned char b;

 	/* poll IR chip */
 	if (1 != i2c_master_recv(i2c_dev, &b, 1))
 		return -EIO;

 	/* it seems that 0xFE indicates that a button is still hold
 	   down, while 0xff indicates that no button is hold down. */

 	if (b == 0xff)
 		return 0;

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

 	*ir_key = b;
 	return 1;
 }

 static int em28xx_get_key_em_haup(struct i2c_client *i2c_dev, u32 *ir_key)
 {
 	unsigned char buf[2];
 	u16 code;
 	int size;

 	/* poll IR chip */
 	size = i2c_master_recv(i2c_dev, buf, sizeof(buf));

 	if (size != 2)
 		return -EIO;

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

 	/*
 	 * Rearranges bits to the right order.
 	 * The bit order were determined experimentally by using
 	 * The original Hauppauge Grey IR and another RC5 that uses addr=0x08
 	 * The RC5 code has 14 bits, but we've experimentally determined
 	 * the meaning for only 11 bits.
 	 * So, the code translation is not complete. Yet, it is enough to
 	 * work with the provided RC5 IR.
 	 */
 	code =
 		 ((buf[0] & 0x01) ? 0x0020 : 0) | /* 		0010 0000 */
 		 ((buf[0] & 0x02) ? 0x0010 : 0) | /* 		0001 0000 */
 		 ((buf[0] & 0x04) ? 0x0008 : 0) | /* 		0000 1000 */
 		 ((buf[0] & 0x08) ? 0x0004 : 0) | /* 		0000 0100 */
 		 ((buf[0] & 0x10) ? 0x0002 : 0) | /* 		0000 0010 */
 		 ((buf[0] & 0x20) ? 0x0001 : 0) | /* 		0000 0001 */
 		 ((buf[1] & 0x08) ? 0x1000 : 0) | /* 0001 0000		  */
 		 ((buf[1] & 0x10) ? 0x0800 : 0) | /* 0000 1000		  */
 		 ((buf[1] & 0x20) ? 0x0400 : 0) | /* 0000 0100		  */
 		 ((buf[1] & 0x40) ? 0x0200 : 0) | /* 0000 0010		  */
 		 ((buf[1] & 0x80) ? 0x0100 : 0);  /* 0000 0001		  */

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

 static int em28xx_get_key_pinnacle_usb_grey(struct i2c_client *i2c_dev,
 					    u32 *ir_key)
 {
 	unsigned char buf[3];

 	/* poll IR chip */

 	if (3 != i2c_master_recv(i2c_dev, buf, 3))
 		return -EIO;

 	if (buf[0] != 0x00)
 		return 0;

 	*ir_key = buf[2]&0x3f;

 	return 1;
 }

 static int em28xx_get_key_winfast_usbii_deluxe(struct i2c_client *i2c_dev,
 					       u32 *ir_key)
 {
 	unsigned char subaddr, keydetect, key;

 	struct i2c_msg msg[] = { { .addr = i2c_dev->addr, .flags = 0, .buf = &subaddr, .len = 1},
 				 { .addr = i2c_dev->addr, .flags = I2C_M_RD, .buf = &keydetect, .len = 1} };

 	subaddr = 0x10;
 	if (2 != i2c_transfer(i2c_dev->adapter, msg, 2))
 		return -EIO;
 	if (keydetect == 0x00)
 		return 0;

 	subaddr = 0x00;
 	msg[1].buf = &key;
 	if (2 != i2c_transfer(i2c_dev->adapter, msg, 2))
 		return -EIO;
 	if (key == 0x00)
 		return 0;

 	*ir_key = key;
 	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/Data (Regs 0x46/0x47) */
 	poll_result->scancode = msg[1] << 8 | 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)
 	 * Remote Control Data (Reg 0x53-0x55)
 	 */
 	switch (ir->rc_type) {
 	case RC_BIT_RC5:
 		poll_result->scancode = msg[1] << 8 | msg[2];
 		break;
 	case RC_BIT_NEC:
 		if ((msg[3] ^ msg[4]) != 0xff)		/* 32 bits NEC */
 			poll_result->scancode = (msg[1] << 24) |
 						(msg[2] << 16) |
 						(msg[3] << 8)  |
 						 msg[4];
 		else if ((msg[1] ^ msg[2]) != 0xff)	/* 24 bits NEC */
 			poll_result->scancode = (msg[1] << 16) |
 						(msg[2] << 8)  |
 						 msg[3];
 		else					/* Normal NEC */
 			poll_result->scancode = msg[1] << 8 | msg[3];
 		break;
 	case RC_BIT_RC6_0:
 		poll_result->scancode = msg[1] << 8 | msg[2];
 		break;
 	default:
 		poll_result->scancode = (msg[1] << 24) | (msg[2] << 16) |
 					(msg[3] << 8)  | msg[4];
 		break;
 	}

 	return 0;
 }

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

 static int em28xx_i2c_ir_handle_key(struct em28xx_IR *ir)
 {
 	struct em28xx *dev = ir->dev;
 	static u32 ir_key;
 	int rc;
 	struct i2c_client client;

 	client.adapter = &ir->dev->i2c_adap[dev->def_i2c_bus];
 	client.addr = ir->i2c_dev_addr;

 	rc = ir->get_key_i2c(&client, &ir_key);
 	if (rc < 0) {
 		dprintk("ir->get_key_i2c() failed: %d\n", rc);
 		return rc;
 	}

 	if (rc) {
 		dprintk("%s: keycode = 0x%04x\n", __func__, ir_key);
 		rc_keydown(ir->rc, ir_key, 0);
 	}
 	return 0;
 }

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

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

 	if (unlikely(poll_result.read_count != ir->last_readcount)) {
 		dprintk("%s: toggle: %d, count: %d, key 0x%04x\n", __func__,
 			poll_result.toggle_bit, poll_result.read_count,
 			poll_result.scancode);
 		if (ir->full_code)
 			rc_keydown(ir->rc,
 				   poll_result.scancode,
 				   poll_result.toggle_bit);
 		else
 			rc_keydown(ir->rc,
 				   poll_result.scancode & 0xff,
 				   poll_result.toggle_bit);

 		if (ir->dev->chip_id == CHIP_ID_EM2874 ||
 		    ir->dev->chip_id == CHIP_ID_EM2884)
 			/* 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;
 		else
 			ir->last_readcount = poll_result.read_count;
 	}
 }

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

 	if (ir->i2c_dev_addr) /* external i2c device */
 		em28xx_i2c_ir_handle_key(ir);
 	else /* internal device */
 		em28xx_ir_handle_key(ir);
 	schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
 }

 static int em28xx_ir_start(struct rc_dev *rc)
 {
 	struct em28xx_IR *ir = rc->priv;

 	INIT_DELAYED_WORK(&ir->work, em28xx_ir_work);
 	schedule_delayed_work(&ir->work, 0);

 	return 0;
 }

 static void em28xx_ir_stop(struct rc_dev *rc)
 {
 	struct em28xx_IR *ir = rc->priv;

 	cancel_delayed_work_sync(&ir->work);
 }

 static int em2860_ir_change_protocol(struct rc_dev *rc_dev, u64 *rc_type)
 {
 	struct em28xx_IR *ir = rc_dev->priv;
 	struct em28xx *dev = ir->dev;

 	/* Adjust xclk based on IR table for RC5/NEC tables */
 	if (*rc_type & RC_BIT_RC5) {
 		dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
 		ir->full_code = 1;
 		*rc_type = RC_BIT_RC5;
 	} else if (*rc_type & RC_BIT_NEC) {
 		dev->board.xclk &= ~EM28XX_XCLK_IR_RC5_MODE;
 		ir->full_code = 1;
 		*rc_type = RC_BIT_NEC;
 	} else if (*rc_type & RC_BIT_UNKNOWN) {
 		*rc_type = RC_BIT_UNKNOWN;
 	} else {
 		*rc_type = ir->rc_type;
 		return -EINVAL;
 	}
 	em28xx_write_reg_bits(dev, EM28XX_R0F_XCLK, dev->board.xclk,
 			      EM28XX_XCLK_IR_RC5_MODE);

 	ir->rc_type = *rc_type;

 	return 0;
 }

 static int em2874_ir_change_protocol(struct rc_dev *rc_dev, u64 *rc_type)
 {
 	struct em28xx_IR *ir = rc_dev->priv;
 	struct em28xx *dev = ir->dev;
 	u8 ir_config = EM2874_IR_RC5;

 	/* Adjust xclk and set type based on IR table for RC5/NEC/RC6 tables */
 	if (*rc_type & RC_BIT_RC5) {
 		dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
 		ir->full_code = 1;
 		*rc_type = RC_BIT_RC5;
 	} else if (*rc_type & RC_BIT_NEC) {
 		dev->board.xclk &= ~EM28XX_XCLK_IR_RC5_MODE;
 		ir_config = EM2874_IR_NEC | EM2874_IR_NEC_NO_PARITY;
 		ir->full_code = 1;
 		*rc_type = RC_BIT_NEC;
 	} else if (*rc_type & RC_BIT_RC6_0) {
 		dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
 		ir_config = EM2874_IR_RC6_MODE_0;
 		ir->full_code = 1;
 		*rc_type = RC_BIT_RC6_0;
 	} else if (*rc_type & RC_BIT_UNKNOWN) {
 		*rc_type = RC_BIT_UNKNOWN;
 	} else {
 		*rc_type = ir->rc_type;
 		return -EINVAL;
 	}
 	em28xx_write_regs(dev, EM2874_R50_IR_CONFIG, &ir_config, 1);
 	em28xx_write_reg_bits(dev, EM28XX_R0F_XCLK, dev->board.xclk,
 			      EM28XX_XCLK_IR_RC5_MODE);

 	ir->rc_type = *rc_type;

 	return 0;
 }
 static int em28xx_ir_change_protocol(struct rc_dev *rc_dev, u64 *rc_type)
 {
 	struct em28xx_IR *ir = rc_dev->priv;
 	struct em28xx *dev = ir->dev;

 	/* Setup the proper handler based on the chip */
 	switch (dev->chip_id) {
 	case CHIP_ID_EM2860:
 	case CHIP_ID_EM2883:
 		return em2860_ir_change_protocol(rc_dev, rc_type);
 	case CHIP_ID_EM2884:
 	case CHIP_ID_EM2874:
 	case CHIP_ID_EM28174:
 		return em2874_ir_change_protocol(rc_dev, rc_type);
 	default:
 		printk("Unrecognized em28xx chip id 0x%02x: IR not supported\n",
 			dev->chip_id);
 		return -EINVAL;
 	}
 }

 static int em28xx_probe_i2c_ir(struct em28xx *dev)
 {
 	int i = 0;
 	/* Leadtek winfast tv USBII deluxe can find a non working IR-device */
 	/* at address 0x18, so if that address is needed for another board in */
 	/* the future, please put it after 0x1f. */
 	const unsigned short addr_list[] = {
 		 0x1f, 0x30, 0x47, I2C_CLIENT_END
 	};

 	while (addr_list[i] != I2C_CLIENT_END) {
 		if (i2c_probe_func_quick_read(&dev->i2c_adap[dev->def_i2c_bus], addr_list[i]) == 1)
 			return addr_list[i];
 		i++;
 	}

 	return -ENODEV;
 }

 /**********************************************************
  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));
 }

 static 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;

 }

 static void em28xx_deregister_snapshot_button(struct em28xx *dev)
 {
 	if (dev->sbutton_input_dev != NULL) {
 		em28xx_info("Deregistering snapshot button\n");
 		cancel_delayed_work_sync(&dev->sbutton_query_work);
 		input_unregister_device(dev->sbutton_input_dev);
 		dev->sbutton_input_dev = NULL;
 	}
 	return;
 }

 static int em28xx_ir_init(struct em28xx *dev)
 {
 	struct em28xx_IR *ir;
 	struct rc_dev *rc;
 	int err = -ENOMEM;
 	u64 rc_type;
 	u16 i2c_rc_dev_addr = 0;

 	if (dev->board.has_snapshot_button)
 		em28xx_register_snapshot_button(dev);

 	if (dev->board.has_ir_i2c) {
 		i2c_rc_dev_addr = em28xx_probe_i2c_ir(dev);
 		if (!i2c_rc_dev_addr) {
 			dev->board.has_ir_i2c = 0;
 			em28xx_warn("No i2c IR remote control device found.\n");
 			return -ENODEV;
 		}
 	}

 	if (dev->board.ir_codes == NULL && !dev->board.has_ir_i2c) {
 		/* No remote control support */
 		em28xx_warn("Remote control support is not available for "
 				"this card.\n");
 		return 0;
 	}

 	ir = kzalloc(sizeof(*ir), GFP_KERNEL);
 	rc = rc_allocate_device();
 	if (!ir || !rc)
 		goto error;

 	/* record handles to ourself */
 	ir->dev = dev;
 	dev->ir = ir;
 	ir->rc = rc;

 	rc->priv = ir;
 	rc->open = em28xx_ir_start;
 	rc->close = em28xx_ir_stop;

 	if (dev->board.has_ir_i2c) {	/* external i2c device */
 		switch (dev->model) {
 		case EM2800_BOARD_TERRATEC_CINERGY_200:
 		case EM2820_BOARD_TERRATEC_CINERGY_250:
 			rc->map_name = RC_MAP_EM_TERRATEC;
 			ir->get_key_i2c = em28xx_get_key_terratec;
 			break;
 		case EM2820_BOARD_PINNACLE_USB_2:
 			rc->map_name = RC_MAP_PINNACLE_GREY;
 			ir->get_key_i2c = em28xx_get_key_pinnacle_usb_grey;
 			break;
 		case EM2820_BOARD_HAUPPAUGE_WINTV_USB_2:
 			rc->map_name = RC_MAP_HAUPPAUGE;
 			ir->get_key_i2c = em28xx_get_key_em_haup;
 			rc->allowed_protos = RC_BIT_RC5;
 			break;
 		case EM2820_BOARD_LEADTEK_WINFAST_USBII_DELUXE:
 			rc->map_name = RC_MAP_WINFAST_USBII_DELUXE;
 			ir->get_key_i2c = em28xx_get_key_winfast_usbii_deluxe;
 			break;
 		default:
 			err = -ENODEV;
 			goto error;
 		}

 		ir->i2c_dev_addr = i2c_rc_dev_addr;
 	} else {	/* internal device */
 		switch (dev->chip_id) {
 		case CHIP_ID_EM2860:
 		case CHIP_ID_EM2883:
 			rc->allowed_protos = RC_BIT_RC5 | RC_BIT_NEC;
 			ir->get_key = default_polling_getkey;
 			break;
 		case CHIP_ID_EM2884:
 		case CHIP_ID_EM2874:
 		case CHIP_ID_EM28174:
 			ir->get_key = em2874_polling_getkey;
 			rc->allowed_protos = RC_BIT_RC5 | RC_BIT_NEC |
 					     RC_BIT_RC6_0;
 			break;
 		default:
 			err = -ENODEV;
 			goto error;
 		}

 		rc->change_protocol = em28xx_ir_change_protocol;
 		rc->map_name = dev->board.ir_codes;

 		/* By default, keep protocol field untouched */
 		rc_type = RC_BIT_UNKNOWN;
 		err = em28xx_ir_change_protocol(rc, &rc_type);
 		if (err)
 			goto error;
 	}

 	/* 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));

 	rc->input_name = ir->name;
 	rc->input_phys = ir->phys;
 	rc->input_id.bustype = BUS_USB;
 	rc->input_id.version = 1;
 	rc->input_id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
 	rc->input_id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
 	rc->dev.parent = &dev->udev->dev;
 	rc->driver_name = MODULE_NAME;

 	/* all done */
 	err = rc_register_device(rc);
 	if (err)
 		goto error;

 	return 0;

 error:
 	dev->ir = NULL;
 	rc_free_device(rc);
 	kfree(ir);
 	return err;
 }

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

 	em28xx_deregister_snapshot_button(dev);

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

 	if (ir->rc)
 		rc_unregister_device(ir->rc);

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

 static struct em28xx_ops rc_ops = {
 	.id   = EM28XX_RC,
 	.name = "Em28xx Input Extension",
 	.init = em28xx_ir_init,
 	.fini = em28xx_ir_fini,
 };

 static int __init em28xx_rc_register(void)
 {
 	return em28xx_register_extension(&rc_ops);
 }

 static void __exit em28xx_rc_unregister(void)
 {
 	em28xx_unregister_extension(&rc_ops);
 }

 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
 MODULE_DESCRIPTION("Em28xx Input driver");

 module_init(em28xx_rc_register);
 module_exit(em28xx_rc_unregister);
	/*
	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/usb.h>
	#include <linux/slab.h>

	#include "em28xx.h"

	#define EM28XX_SNAPSHOT_KEY KEY_CAMERA
	#define EM28XX_SBUTTON_QUERY_INTERVAL 500

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

	#define MODULE_NAME "em28xx"

	#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;

	u32 scancode;
	};

	struct em28xx_IR {
	struct em28xx *dev;
	struct rc_dev *rc;
	char name[32];
	char phys[32];

	/* poll decoder */
	int polling;
	struct delayed_work work;
	unsigned int full_code:1;
	unsigned int last_readcount;
	u64 rc_type;

	/* i2c slave address of external device (if used) */
	u16 i2c_dev_addr;

	int (get_key_i2c)(struct i2c_client , u32 *);
	int (get_key)(struct em28xx_IR , struct em28xx_ir_poll_result *);
	};

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

	static int em28xx_get_key_terratec(struct i2c_client i2c_dev, u32 ir_key)
	{
	unsigned char b;

	/* poll IR chip */
	if (1 != i2c_master_recv(i2c_dev, &b, 1))
	return -EIO;

	/* it seems that 0xFE indicates that a button is still hold
	down, while 0xff indicates that no button is hold down. */

	if (b == 0xff)
	return 0;

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

	*ir_key = b;
	return 1;
	}

	static int em28xx_get_key_em_haup(struct i2c_client i2c_dev, u32 ir_key)
	{
	unsigned char buf[2];
	u16 code;
	int size;

	/* poll IR chip */
	size = i2c_master_recv(i2c_dev, buf, sizeof(buf));

	if (size != 2)
	return -EIO;

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

	/*
	* Rearranges bits to the right order.
	* The bit order were determined experimentally by using
	* The original Hauppauge Grey IR and another RC5 that uses addr=0x08
	* The RC5 code has 14 bits, but we've experimentally determined
	* the meaning for only 11 bits.
	* So, the code translation is not complete. Yet, it is enough to
	* work with the provided RC5 IR.
	*/
	code =
	((buf[0] & 0x01) ? 0x0020 : 0) \| /* 0010 0000 */
	((buf[0] & 0x02) ? 0x0010 : 0) \| /* 0001 0000 */
	((buf[0] & 0x04) ? 0x0008 : 0) \| /* 0000 1000 */
	((buf[0] & 0x08) ? 0x0004 : 0) \| /* 0000 0100 */
	((buf[0] & 0x10) ? 0x0002 : 0) \| /* 0000 0010 */
	((buf[0] & 0x20) ? 0x0001 : 0) \| /* 0000 0001 */
	((buf[1] & 0x08) ? 0x1000 : 0) \| /* 0001 0000 */
	((buf[1] & 0x10) ? 0x0800 : 0) \| /* 0000 1000 */
	((buf[1] & 0x20) ? 0x0400 : 0) \| /* 0000 0100 */
	((buf[1] & 0x40) ? 0x0200 : 0) \| /* 0000 0010 */
	((buf[1] & 0x80) ? 0x0100 : 0); /* 0000 0001 */

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

	static int em28xx_get_key_pinnacle_usb_grey(struct i2c_client *i2c_dev,
	u32 *ir_key)
	{
	unsigned char buf[3];

	/* poll IR chip */

	if (3 != i2c_master_recv(i2c_dev, buf, 3))
	return -EIO;

	if (buf[0] != 0x00)
	return 0;

	*ir_key = buf[2]&0x3f;

	return 1;
	}

	static int em28xx_get_key_winfast_usbii_deluxe(struct i2c_client *i2c_dev,
	u32 *ir_key)
	{
	unsigned char subaddr, keydetect, key;

	struct i2c_msg msg[] = { { .addr = i2c_dev->addr, .flags = 0, .buf = &subaddr, .len = 1},
	{ .addr = i2c_dev->addr, .flags = I2C_M_RD, .buf = &keydetect, .len = 1} };

	subaddr = 0x10;
	if (2 != i2c_transfer(i2c_dev->adapter, msg, 2))
	return -EIO;
	if (keydetect == 0x00)
	return 0;

	subaddr = 0x00;
	msg[1].buf = &key;
	if (2 != i2c_transfer(i2c_dev->adapter, msg, 2))
	return -EIO;
	if (key == 0x00)
	return 0;

	*ir_key = key;
	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/Data (Regs 0x46/0x47) */
	poll_result->scancode = msg[1] << 8 \| 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)
	* Remote Control Data (Reg 0x53-0x55)
	*/
	switch (ir->rc_type) {
	case RC_BIT_RC5:
	poll_result->scancode = msg[1] << 8 \| msg[2];
	break;
	case RC_BIT_NEC:
	if ((msg[3] ^ msg[4]) != 0xff) /* 32 bits NEC */
	poll_result->scancode = (msg[1] << 24) \|
	(msg[2] << 16) \|
	(msg[3] << 8) \|
	msg[4];
	else if ((msg[1] ^ msg[2]) != 0xff) /* 24 bits NEC */
	poll_result->scancode = (msg[1] << 16) \|
	(msg[2] << 8) \|
	msg[3];
	else /* Normal NEC */
	poll_result->scancode = msg[1] << 8 \| msg[3];
	break;
	case RC_BIT_RC6_0:
	poll_result->scancode = msg[1] << 8 \| msg[2];
	break;
	default:
	poll_result->scancode = (msg[1] << 24) \| (msg[2] << 16) \|
	(msg[3] << 8) \| msg[4];
	break;
	}

	return 0;
	}

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

	static int em28xx_i2c_ir_handle_key(struct em28xx_IR *ir)
	{
	struct em28xx *dev = ir->dev;
	static u32 ir_key;
	int rc;
	struct i2c_client client;

	client.adapter = &ir->dev->i2c_adap[dev->def_i2c_bus];
	client.addr = ir->i2c_dev_addr;

	rc = ir->get_key_i2c(&client, &ir_key);
	if (rc < 0) {
	dprintk("ir->get_key_i2c() failed: %d\n", rc);
	return rc;
	}

	if (rc) {
	dprintk("%s: keycode = 0x%04x\n", __func__, ir_key);
	rc_keydown(ir->rc, ir_key, 0);
	}
	return 0;
	}

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

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

	if (unlikely(poll_result.read_count != ir->last_readcount)) {
	dprintk("%s: toggle: %d, count: %d, key 0x%04x\n", __func__,
	poll_result.toggle_bit, poll_result.read_count,
	poll_result.scancode);
	if (ir->full_code)
	rc_keydown(ir->rc,
	poll_result.scancode,
	poll_result.toggle_bit);
	else
	rc_keydown(ir->rc,
	poll_result.scancode & 0xff,
	poll_result.toggle_bit);

	if (ir->dev->chip_id == CHIP_ID_EM2874 \|\|
	ir->dev->chip_id == CHIP_ID_EM2884)
	/* 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;
	else
	ir->last_readcount = poll_result.read_count;
	}
	}

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

	if (ir->i2c_dev_addr) /* external i2c device */
	em28xx_i2c_ir_handle_key(ir);
	else /* internal device */
	em28xx_ir_handle_key(ir);
	schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
	}

	static int em28xx_ir_start(struct rc_dev *rc)
	{
	struct em28xx_IR *ir = rc->priv;

	INIT_DELAYED_WORK(&ir->work, em28xx_ir_work);
	schedule_delayed_work(&ir->work, 0);

	return 0;
	}

	static void em28xx_ir_stop(struct rc_dev *rc)
	{
	struct em28xx_IR *ir = rc->priv;

	cancel_delayed_work_sync(&ir->work);
	}

	static int em2860_ir_change_protocol(struct rc_dev rc_dev, u64 rc_type)
	{
	struct em28xx_IR *ir = rc_dev->priv;
	struct em28xx *dev = ir->dev;

	/* Adjust xclk based on IR table for RC5/NEC tables */
	if (*rc_type & RC_BIT_RC5) {
	dev->board.xclk \|= EM28XX_XCLK_IR_RC5_MODE;
	ir->full_code = 1;
	*rc_type = RC_BIT_RC5;
	} else if (*rc_type & RC_BIT_NEC) {
	dev->board.xclk &= ~EM28XX_XCLK_IR_RC5_MODE;
	ir->full_code = 1;
	*rc_type = RC_BIT_NEC;
	} else if (*rc_type & RC_BIT_UNKNOWN) {
	*rc_type = RC_BIT_UNKNOWN;
	} else {
	*rc_type = ir->rc_type;
	return -EINVAL;
	}
	em28xx_write_reg_bits(dev, EM28XX_R0F_XCLK, dev->board.xclk,
	EM28XX_XCLK_IR_RC5_MODE);

	ir->rc_type = *rc_type;

	return 0;
	}

	static int em2874_ir_change_protocol(struct rc_dev rc_dev, u64 rc_type)
	{
	struct em28xx_IR *ir = rc_dev->priv;
	struct em28xx *dev = ir->dev;
	u8 ir_config = EM2874_IR_RC5;

	/* Adjust xclk and set type based on IR table for RC5/NEC/RC6 tables */
	if (*rc_type & RC_BIT_RC5) {
	dev->board.xclk \|= EM28XX_XCLK_IR_RC5_MODE;
	ir->full_code = 1;
	*rc_type = RC_BIT_RC5;
	} else if (*rc_type & RC_BIT_NEC) {
	dev->board.xclk &= ~EM28XX_XCLK_IR_RC5_MODE;
	ir_config = EM2874_IR_NEC \| EM2874_IR_NEC_NO_PARITY;
	ir->full_code = 1;
	*rc_type = RC_BIT_NEC;
	} else if (*rc_type & RC_BIT_RC6_0) {
	dev->board.xclk \|= EM28XX_XCLK_IR_RC5_MODE;
	ir_config = EM2874_IR_RC6_MODE_0;
	ir->full_code = 1;
	*rc_type = RC_BIT_RC6_0;
	} else if (*rc_type & RC_BIT_UNKNOWN) {
	*rc_type = RC_BIT_UNKNOWN;
	} else {
	*rc_type = ir->rc_type;
	return -EINVAL;
	}
	em28xx_write_regs(dev, EM2874_R50_IR_CONFIG, &ir_config, 1);
	em28xx_write_reg_bits(dev, EM28XX_R0F_XCLK, dev->board.xclk,
	EM28XX_XCLK_IR_RC5_MODE);

	ir->rc_type = *rc_type;

	return 0;
	}
	static int em28xx_ir_change_protocol(struct rc_dev rc_dev, u64 rc_type)
	{
	struct em28xx_IR *ir = rc_dev->priv;
	struct em28xx *dev = ir->dev;

	/* Setup the proper handler based on the chip */
	switch (dev->chip_id) {
	case CHIP_ID_EM2860:
	case CHIP_ID_EM2883:
	return em2860_ir_change_protocol(rc_dev, rc_type);
	case CHIP_ID_EM2884:
	case CHIP_ID_EM2874:
	case CHIP_ID_EM28174:
	return em2874_ir_change_protocol(rc_dev, rc_type);
	default:
	printk("Unrecognized em28xx chip id 0x%02x: IR not supported\n",
	dev->chip_id);
	return -EINVAL;
	}
	}

	static int em28xx_probe_i2c_ir(struct em28xx *dev)
	{
	int i = 0;
	/* Leadtek winfast tv USBII deluxe can find a non working IR-device */
	/* at address 0x18, so if that address is needed for another board in */
	/* the future, please put it after 0x1f. */
	const unsigned short addr_list[] = {
	0x1f, 0x30, 0x47, I2C_CLIENT_END
	};

	while (addr_list[i] != I2C_CLIENT_END) {
	if (i2c_probe_func_quick_read(&dev->i2c_adap[dev->def_i2c_bus], addr_list[i]) == 1)
	return addr_list[i];
	i++;
	}

	return -ENODEV;
	}

	/**********************************************************
	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));
	}

	static 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;

	}

	static void em28xx_deregister_snapshot_button(struct em28xx *dev)
	{
	if (dev->sbutton_input_dev != NULL) {
	em28xx_info("Deregistering snapshot button\n");
	cancel_delayed_work_sync(&dev->sbutton_query_work);
	input_unregister_device(dev->sbutton_input_dev);
	dev->sbutton_input_dev = NULL;
	}
	return;
	}

	static int em28xx_ir_init(struct em28xx *dev)
	{
	struct em28xx_IR *ir;
	struct rc_dev *rc;
	int err = -ENOMEM;
	u64 rc_type;
	u16 i2c_rc_dev_addr = 0;

	if (dev->board.has_snapshot_button)
	em28xx_register_snapshot_button(dev);

	if (dev->board.has_ir_i2c) {
	i2c_rc_dev_addr = em28xx_probe_i2c_ir(dev);
	if (!i2c_rc_dev_addr) {
	dev->board.has_ir_i2c = 0;
	em28xx_warn("No i2c IR remote control device found.\n");
	return -ENODEV;
	}
	}

	if (dev->board.ir_codes == NULL && !dev->board.has_ir_i2c) {
	/* No remote control support */
	em28xx_warn("Remote control support is not available for "
	"this card.\n");
	return 0;
	}

	ir = kzalloc(sizeof(*ir), GFP_KERNEL);
	rc = rc_allocate_device();
	if (!ir \|\| !rc)
	goto error;

	/* record handles to ourself */
	ir->dev = dev;
	dev->ir = ir;
	ir->rc = rc;

	rc->priv = ir;
	rc->open = em28xx_ir_start;
	rc->close = em28xx_ir_stop;

	if (dev->board.has_ir_i2c) { /* external i2c device */
	switch (dev->model) {
	case EM2800_BOARD_TERRATEC_CINERGY_200:
	case EM2820_BOARD_TERRATEC_CINERGY_250:
	rc->map_name = RC_MAP_EM_TERRATEC;
	ir->get_key_i2c = em28xx_get_key_terratec;
	break;
	case EM2820_BOARD_PINNACLE_USB_2:
	rc->map_name = RC_MAP_PINNACLE_GREY;
	ir->get_key_i2c = em28xx_get_key_pinnacle_usb_grey;
	break;
	case EM2820_BOARD_HAUPPAUGE_WINTV_USB_2:
	rc->map_name = RC_MAP_HAUPPAUGE;
	ir->get_key_i2c = em28xx_get_key_em_haup;
	rc->allowed_protos = RC_BIT_RC5;
	break;
	case EM2820_BOARD_LEADTEK_WINFAST_USBII_DELUXE:
	rc->map_name = RC_MAP_WINFAST_USBII_DELUXE;
	ir->get_key_i2c = em28xx_get_key_winfast_usbii_deluxe;
	break;
	default:
	err = -ENODEV;
	goto error;
	}

	ir->i2c_dev_addr = i2c_rc_dev_addr;
	} else { /* internal device */
	switch (dev->chip_id) {
	case CHIP_ID_EM2860:
	case CHIP_ID_EM2883:
	rc->allowed_protos = RC_BIT_RC5 \| RC_BIT_NEC;
	ir->get_key = default_polling_getkey;
	break;
	case CHIP_ID_EM2884:
	case CHIP_ID_EM2874:
	case CHIP_ID_EM28174:
	ir->get_key = em2874_polling_getkey;
	rc->allowed_protos = RC_BIT_RC5 \| RC_BIT_NEC \|
	RC_BIT_RC6_0;
	break;
	default:
	err = -ENODEV;
	goto error;
	}

	rc->change_protocol = em28xx_ir_change_protocol;
	rc->map_name = dev->board.ir_codes;

	/* By default, keep protocol field untouched */
	rc_type = RC_BIT_UNKNOWN;
	err = em28xx_ir_change_protocol(rc, &rc_type);
	if (err)
	goto error;
	}

	/* 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));

	rc->input_name = ir->name;
	rc->input_phys = ir->phys;
	rc->input_id.bustype = BUS_USB;
	rc->input_id.version = 1;
	rc->input_id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
	rc->input_id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
	rc->dev.parent = &dev->udev->dev;
	rc->driver_name = MODULE_NAME;

	/* all done */
	err = rc_register_device(rc);
	if (err)
	goto error;

	return 0;

	error:
	dev->ir = NULL;
	rc_free_device(rc);
	kfree(ir);
	return err;
	}

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

	em28xx_deregister_snapshot_button(dev);

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

	if (ir->rc)
	rc_unregister_device(ir->rc);

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

	static struct em28xx_ops rc_ops = {
	.id = EM28XX_RC,
	.name = "Em28xx Input Extension",
	.init = em28xx_ir_init,
	.fini = em28xx_ir_fini,
	};

	static int __init em28xx_rc_register(void)
	{
	return em28xx_register_extension(&rc_ops);
	}

	static void __exit em28xx_rc_unregister(void)
	{
	em28xx_unregister_extension(&rc_ops);
	}

	MODULE_LICENSE("GPL");
	MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
	MODULE_DESCRIPTION("Em28xx Input driver");

	module_init(em28xx_rc_register);
	module_exit(em28xx_rc_unregister);