1 files changed, 933 insertions, 0 deletions

diff --git a/drivers/media/usb/em28xx/em28xx-input.c b/drivers/media/usb/em28xx/em28xx-input.c
new file mode 100644
index 000000000..5f3b00869
--- /dev/null
+++ b/drivers/media/usb/em28xx/em28xx-input.c
@@ -0,0 +1,933 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// 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@kernel.org>
+//		      Sascha Sommer <saschasommer@freenet.de>
+
+#include "em28xx.h"
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/usb.h>
+#include <linux/usb/input.h>
+#include <linux/slab.h>
+#include <linux/bitrev.h>
+
+#define EM28XX_SNAPSHOT_KEY				KEY_CAMERA
+#define EM28XX_BUTTONS_DEBOUNCED_QUERY_INTERVAL		500 /* [ms] */
+#define EM28XX_BUTTONS_VOLATILE_QUERY_INTERVAL		100 /* [ms] */
+
+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...) do {					\
+	if (ir_debug)							\
+		dev_printk(KERN_DEBUG, &ir->dev->intf->dev,		\
+			   "input: %s: " fmt, __func__, ## arg);	\
+} while (0)
+
+/*
+ * Polling structure used by em28xx IR's
+ */
+
+struct em28xx_ir_poll_result {
+	unsigned int toggle_bit:1;
+	unsigned int read_count:7;
+
+	enum rc_proto protocol;
+	u32 scancode;
+};
+
+struct em28xx_IR {
+	struct em28xx *dev;
+	struct rc_dev *rc;
+	char phys[32];
+
+	/* poll decoder */
+	int polling;
+	struct delayed_work work;
+	unsigned int full_code:1;
+	unsigned int last_readcount;
+	u64 rc_proto;
+
+	struct i2c_client *i2c_client;
+
+	int  (*get_key_i2c)(struct i2c_client *ir, enum rc_proto *protocol,
+			    u32 *scancode);
+	int  (*get_key)(struct em28xx_IR *ir, struct em28xx_ir_poll_result *r);
+};
+
+/*
+ * I2C IR based get keycodes - should be used with ir-kbd-i2c
+ */
+
+static int em28xx_get_key_terratec(struct i2c_client *i2c_dev,
+				   enum rc_proto *protocol, u32 *scancode)
+{
+	int rc;
+	unsigned char b;
+
+	/* poll IR chip */
+	rc = i2c_master_recv(i2c_dev, &b, 1);
+	if (rc != 1) {
+		if (rc < 0)
+			return rc;
+		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;
+
+	*protocol = RC_PROTO_UNKNOWN;
+	*scancode = b;
+	return 1;
+}
+
+static int em28xx_get_key_em_haup(struct i2c_client *i2c_dev,
+				  enum rc_proto *protocol, u32 *scancode)
+{
+	unsigned char buf[2];
+	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.
+	 */
+	*protocol = RC_PROTO_RC5;
+	*scancode = (bitrev8(buf[1]) & 0x1f) << 8 | bitrev8(buf[0]) >> 2;
+	return 1;
+}
+
+static int em28xx_get_key_pinnacle_usb_grey(struct i2c_client *i2c_dev,
+					    enum rc_proto *protocol,
+					    u32 *scancode)
+{
+	unsigned char buf[3];
+
+	/* poll IR chip */
+
+	if (i2c_master_recv(i2c_dev, buf, 3) != 3)
+		return -EIO;
+
+	if (buf[0] != 0x00)
+		return 0;
+
+	*protocol = RC_PROTO_UNKNOWN;
+	*scancode = buf[2] & 0x3f;
+	return 1;
+}
+
+static int em28xx_get_key_winfast_usbii_deluxe(struct i2c_client *i2c_dev,
+					       enum rc_proto *protocol,
+					       u32 *scancode)
+{
+	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 (i2c_transfer(i2c_dev->adapter, msg, 2) != 2)
+		return -EIO;
+	if (keydetect == 0x00)
+		return 0;
+
+	subaddr = 0x00;
+	msg[1].buf = &key;
+	if (i2c_transfer(i2c_dev->adapter, msg, 2) != 2)
+		return -EIO;
+	if (key == 0x00)
+		return 0;
+
+	*protocol = RC_PROTO_UNKNOWN;
+	*scancode = 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) */
+	switch (ir->rc_proto) {
+	case RC_PROTO_BIT_RC5:
+		poll_result->protocol = RC_PROTO_RC5;
+		poll_result->scancode = RC_SCANCODE_RC5(msg[1], msg[2]);
+		break;
+
+	case RC_PROTO_BIT_NEC:
+		poll_result->protocol = RC_PROTO_NEC;
+		poll_result->scancode = RC_SCANCODE_NEC(msg[1], msg[2]);
+		break;
+
+	default:
+		poll_result->protocol = RC_PROTO_UNKNOWN;
+		poll_result->scancode = msg[1] << 8 | msg[2];
+		break;
+	}
+
+	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_proto) {
+	case RC_PROTO_BIT_RC5:
+		poll_result->protocol = RC_PROTO_RC5;
+		poll_result->scancode = RC_SCANCODE_RC5(msg[1], msg[2]);
+		break;
+
+	case RC_PROTO_BIT_NEC:
+		poll_result->scancode = ir_nec_bytes_to_scancode(msg[1], msg[2], msg[3], msg[4],
+								 &poll_result->protocol);
+		break;
+
+	case RC_PROTO_BIT_RC6_0:
+		poll_result->protocol = RC_PROTO_RC6_0;
+		poll_result->scancode = RC_SCANCODE_RC6_0(msg[1], msg[2]);
+		break;
+
+	default:
+		poll_result->protocol = RC_PROTO_UNKNOWN;
+		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)
+{
+	static u32 scancode;
+	enum rc_proto protocol;
+	int rc;
+
+	rc = ir->get_key_i2c(ir->i2c_client, &protocol, &scancode);
+	if (rc < 0) {
+		dprintk("ir->get_key_i2c() failed: %d\n", rc);
+		return rc;
+	}
+
+	if (rc) {
+		dprintk("%s: proto = 0x%04x, scancode = 0x%04x\n",
+			__func__, protocol, scancode);
+		rc_keydown(ir->rc, protocol, scancode, 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.protocol,
+				   poll_result.scancode,
+				   poll_result.toggle_bit);
+		else
+			rc_keydown(ir->rc,
+				   RC_PROTO_UNKNOWN,
+				   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_client) /* 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_proto)
+{
+	struct em28xx_IR *ir = rc_dev->priv;
+	struct em28xx *dev = ir->dev;
+
+	/* Adjust xclk based on IR table for RC5/NEC tables */
+	if (*rc_proto & RC_PROTO_BIT_RC5) {
+		dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
+		ir->full_code = 1;
+		*rc_proto = RC_PROTO_BIT_RC5;
+	} else if (*rc_proto & RC_PROTO_BIT_NEC) {
+		dev->board.xclk &= ~EM28XX_XCLK_IR_RC5_MODE;
+		ir->full_code = 1;
+		*rc_proto = RC_PROTO_BIT_NEC;
+	} else if (*rc_proto & RC_PROTO_BIT_UNKNOWN) {
+		*rc_proto = RC_PROTO_BIT_UNKNOWN;
+	} else {
+		*rc_proto = ir->rc_proto;
+		return -EINVAL;
+	}
+	em28xx_write_reg_bits(dev, EM28XX_R0F_XCLK, dev->board.xclk,
+			      EM28XX_XCLK_IR_RC5_MODE);
+
+	ir->rc_proto = *rc_proto;
+
+	return 0;
+}
+
+static int em2874_ir_change_protocol(struct rc_dev *rc_dev, u64 *rc_proto)
+{
+	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_proto & RC_PROTO_BIT_RC5) {
+		dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
+		ir->full_code = 1;
+		*rc_proto = RC_PROTO_BIT_RC5;
+	} else if (*rc_proto & RC_PROTO_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_proto = RC_PROTO_BIT_NEC;
+	} else if (*rc_proto & RC_PROTO_BIT_RC6_0) {
+		dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
+		ir_config = EM2874_IR_RC6_MODE_0;
+		ir->full_code = 1;
+		*rc_proto = RC_PROTO_BIT_RC6_0;
+	} else if (*rc_proto & RC_PROTO_BIT_UNKNOWN) {
+		*rc_proto = RC_PROTO_BIT_UNKNOWN;
+	} else {
+		*rc_proto = ir->rc_proto;
+		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_proto = *rc_proto;
+
+	return 0;
+}
+
+static int em28xx_ir_change_protocol(struct rc_dev *rc_dev, u64 *rc_proto)
+{
+	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_proto);
+	case CHIP_ID_EM2884:
+	case CHIP_ID_EM2874:
+	case CHIP_ID_EM28174:
+	case CHIP_ID_EM28178:
+		return em2874_ir_change_protocol(rc_dev, rc_proto);
+	default:
+		dev_err(&ir->dev->intf->dev,
+			"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.
+	 */
+	static 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 buttons
+ */
+
+static void em28xx_query_buttons(struct work_struct *work)
+{
+	struct em28xx *dev =
+		container_of(work, struct em28xx, buttons_query_work.work);
+	u8 i, j;
+	int regval;
+	bool is_pressed, was_pressed;
+	const struct em28xx_led *led;
+
+	/* Poll and evaluate all addresses */
+	for (i = 0; i < dev->num_button_polling_addresses; i++) {
+		/* Read value from register */
+		regval = em28xx_read_reg(dev, dev->button_polling_addresses[i]);
+		if (regval < 0)
+			continue;
+		/* Check states of the buttons and act */
+		j = 0;
+		while (dev->board.buttons[j].role >= 0 &&
+		       dev->board.buttons[j].role < EM28XX_NUM_BUTTON_ROLES) {
+			const struct em28xx_button *button;
+
+			button = &dev->board.buttons[j];
+
+			/* Check if button uses the current address */
+			if (button->reg_r != dev->button_polling_addresses[i]) {
+				j++;
+				continue;
+			}
+			/* Determine if button is and was pressed last time */
+			is_pressed = regval & button->mask;
+			was_pressed = dev->button_polling_last_values[i]
+				       & button->mask;
+			if (button->inverted) {
+				is_pressed = !is_pressed;
+				was_pressed = !was_pressed;
+			}
+			/* Clear button state (if needed) */
+			if (is_pressed && button->reg_clearing)
+				em28xx_write_reg(dev, button->reg_clearing,
+						 (~regval & button->mask)
+						    | (regval & ~button->mask));
+			/* Handle button state */
+			if (!is_pressed || was_pressed) {
+				j++;
+				continue;
+			}
+			switch (button->role) {
+			case EM28XX_BUTTON_SNAPSHOT:
+				/* Emulate the keypress */
+				input_report_key(dev->sbutton_input_dev,
+						 EM28XX_SNAPSHOT_KEY, 1);
+				/* Unpress the key */
+				input_report_key(dev->sbutton_input_dev,
+						 EM28XX_SNAPSHOT_KEY, 0);
+				break;
+			case EM28XX_BUTTON_ILLUMINATION:
+				led = em28xx_find_led(dev,
+						      EM28XX_LED_ILLUMINATION);
+				/* Switch illumination LED on/off */
+				if (led)
+					em28xx_toggle_reg_bits(dev,
+							       led->gpio_reg,
+							       led->gpio_mask);
+				break;
+			default:
+				WARN_ONCE(1, "BUG: unhandled button role.");
+			}
+			/* Next button */
+			j++;
+		}
+		/* Save current value for comparison during the next polling */
+		dev->button_polling_last_values[i] = regval;
+	}
+	/* Schedule next poll */
+	schedule_delayed_work(&dev->buttons_query_work,
+			      msecs_to_jiffies(dev->button_polling_interval));
+}
+
+static int em28xx_register_snapshot_button(struct em28xx *dev)
+{
+	struct usb_device *udev = interface_to_usbdev(dev->intf);
+	struct input_dev *input_dev;
+	int err;
+
+	dev_info(&dev->intf->dev, "Registering snapshot button...\n");
+	input_dev = input_allocate_device();
+	if (!input_dev)
+		return -ENOMEM;
+
+	usb_make_path(udev, dev->snapshot_button_path,
+		      sizeof(dev->snapshot_button_path));
+	strlcat(dev->snapshot_button_path, "/sbutton",
+		sizeof(dev->snapshot_button_path));
+
+	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;
+	usb_to_input_id(udev, &input_dev->id);
+	input_dev->dev.parent = &dev->intf->dev;
+
+	err = input_register_device(input_dev);
+	if (err) {
+		dev_err(&dev->intf->dev, "input_register_device failed\n");
+		input_free_device(input_dev);
+		return err;
+	}
+
+	dev->sbutton_input_dev = input_dev;
+	return 0;
+}
+
+static void em28xx_init_buttons(struct em28xx *dev)
+{
+	u8  i = 0, j = 0;
+	bool addr_new = false;
+
+	dev->button_polling_interval = EM28XX_BUTTONS_DEBOUNCED_QUERY_INTERVAL;
+	while (dev->board.buttons[i].role >= 0 &&
+	       dev->board.buttons[i].role < EM28XX_NUM_BUTTON_ROLES) {
+		const struct em28xx_button *button = &dev->board.buttons[i];
+
+		/* Check if polling address is already on the list */
+		addr_new = true;
+		for (j = 0; j < dev->num_button_polling_addresses; j++) {
+			if (button->reg_r == dev->button_polling_addresses[j]) {
+				addr_new = false;
+				break;
+			}
+		}
+		/* Check if max. number of polling addresses is exceeded */
+		if (addr_new && dev->num_button_polling_addresses
+					   >= EM28XX_NUM_BUTTON_ADDRESSES_MAX) {
+			WARN_ONCE(1, "BUG: maximum number of button polling addresses exceeded.");
+			goto next_button;
+		}
+		/* Button role specific checks and actions */
+		if (button->role == EM28XX_BUTTON_SNAPSHOT) {
+			/* Register input device */
+			if (em28xx_register_snapshot_button(dev) < 0)
+				goto next_button;
+		} else if (button->role == EM28XX_BUTTON_ILLUMINATION) {
+			/* Check sanity */
+			if (!em28xx_find_led(dev, EM28XX_LED_ILLUMINATION)) {
+				dev_err(&dev->intf->dev,
+					"BUG: illumination button defined, but no illumination LED.\n");
+				goto next_button;
+			}
+		}
+		/* Add read address to list of polling addresses */
+		if (addr_new) {
+			unsigned int index = dev->num_button_polling_addresses;
+
+			dev->button_polling_addresses[index] = button->reg_r;
+			dev->num_button_polling_addresses++;
+		}
+		/* Reduce polling interval if necessary */
+		if (!button->reg_clearing)
+			dev->button_polling_interval =
+					 EM28XX_BUTTONS_VOLATILE_QUERY_INTERVAL;
+next_button:
+		/* Next button */
+		i++;
+	}
+
+	/* Start polling */
+	if (dev->num_button_polling_addresses) {
+		memset(dev->button_polling_last_values, 0,
+		       EM28XX_NUM_BUTTON_ADDRESSES_MAX);
+		schedule_delayed_work(&dev->buttons_query_work,
+				      msecs_to_jiffies(dev->button_polling_interval));
+	}
+}
+
+static void em28xx_shutdown_buttons(struct em28xx *dev)
+{
+	/* Cancel polling */
+	cancel_delayed_work_sync(&dev->buttons_query_work);
+	/* Clear polling addresses list */
+	dev->num_button_polling_addresses = 0;
+	/* Deregister input devices */
+	if (dev->sbutton_input_dev) {
+		dev_info(&dev->intf->dev, "Deregistering snapshot button\n");
+		input_unregister_device(dev->sbutton_input_dev);
+		dev->sbutton_input_dev = NULL;
+	}
+}
+
+static int em28xx_ir_init(struct em28xx *dev)
+{
+	struct usb_device *udev = interface_to_usbdev(dev->intf);
+	struct em28xx_IR *ir;
+	struct rc_dev *rc;
+	int err = -ENOMEM;
+	u64 rc_proto;
+	u16 i2c_rc_dev_addr = 0;
+
+	if (dev->is_audio_only) {
+		/* Shouldn't initialize IR for this interface */
+		return 0;
+	}
+
+	kref_get(&dev->ref);
+	INIT_DELAYED_WORK(&dev->buttons_query_work, em28xx_query_buttons);
+
+	if (dev->board.buttons)
+		em28xx_init_buttons(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;
+			dev_warn(&dev->intf->dev,
+				 "No i2c IR remote control device found.\n");
+			err = -ENODEV;
+			goto ref_put;
+		}
+	}
+
+	if (!dev->board.ir_codes && !dev->board.has_ir_i2c) {
+		/* No remote control support */
+		dev_warn(&dev->intf->dev,
+			 "Remote control support is not available for this card.\n");
+		return 0;
+	}
+
+	dev_info(&dev->intf->dev, "Registering input extension\n");
+
+	ir = kzalloc(sizeof(*ir), GFP_KERNEL);
+	if (!ir)
+		goto ref_put;
+	rc = rc_allocate_device(RC_DRIVER_SCANCODE);
+	if (!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_protocols = RC_PROTO_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_client = kzalloc(sizeof(*ir->i2c_client), GFP_KERNEL);
+		if (!ir->i2c_client)
+			goto error;
+		ir->i2c_client->adapter = &ir->dev->i2c_adap[dev->def_i2c_bus];
+		ir->i2c_client->addr = i2c_rc_dev_addr;
+		ir->i2c_client->flags = 0;
+		/* NOTE: all other fields of i2c_client are unused */
+	} else {	/* internal device */
+		switch (dev->chip_id) {
+		case CHIP_ID_EM2860:
+		case CHIP_ID_EM2883:
+			rc->allowed_protocols = RC_PROTO_BIT_RC5 |
+						RC_PROTO_BIT_NEC;
+			ir->get_key = default_polling_getkey;
+			break;
+		case CHIP_ID_EM2884:
+		case CHIP_ID_EM2874:
+		case CHIP_ID_EM28174:
+		case CHIP_ID_EM28178:
+			ir->get_key = em2874_polling_getkey;
+			rc->allowed_protocols = RC_PROTO_BIT_RC5 |
+				RC_PROTO_BIT_NEC | RC_PROTO_BIT_NECX |
+				RC_PROTO_BIT_NEC32 | RC_PROTO_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_proto = RC_PROTO_BIT_UNKNOWN;
+		err = em28xx_ir_change_protocol(rc, &rc_proto);
+		if (err)
+			goto error;
+	}
+
+	/* This is how often we ask the chip for IR information */
+	ir->polling = 100; /* ms */
+
+	usb_make_path(udev, ir->phys, sizeof(ir->phys));
+	strlcat(ir->phys, "/input0", sizeof(ir->phys));
+
+	rc->device_name = em28xx_boards[dev->model].name;
+	rc->input_phys = ir->phys;
+	usb_to_input_id(udev, &rc->input_id);
+	rc->dev.parent = &dev->intf->dev;
+	rc->driver_name = MODULE_NAME;
+
+	/* all done */
+	err = rc_register_device(rc);
+	if (err)
+		goto error;
+
+	dev_info(&dev->intf->dev, "Input extension successfully initialized\n");
+
+	return 0;
+
+error:
+	kfree(ir->i2c_client);
+	dev->ir = NULL;
+	rc_free_device(rc);
+	kfree(ir);
+ref_put:
+	em28xx_shutdown_buttons(dev);
+	return err;
+}
+
+static int em28xx_ir_fini(struct em28xx *dev)
+{
+	struct em28xx_IR *ir = dev->ir;
+
+	if (dev->is_audio_only) {
+		/* Shouldn't initialize IR for this interface */
+		return 0;
+	}
+
+	dev_info(&dev->intf->dev, "Closing input extension\n");
+
+	em28xx_shutdown_buttons(dev);
+
+	/* skip detach on non attached boards */
+	if (!ir)
+		goto ref_put;
+
+	rc_unregister_device(ir->rc);
+
+	kfree(ir->i2c_client);
+
+	/* done */
+	kfree(ir);
+	dev->ir = NULL;
+
+ref_put:
+	kref_put(&dev->ref, em28xx_free_device);
+
+	return 0;
+}
+
+static int em28xx_ir_suspend(struct em28xx *dev)
+{
+	struct em28xx_IR *ir = dev->ir;
+
+	if (dev->is_audio_only)
+		return 0;
+
+	dev_info(&dev->intf->dev, "Suspending input extension\n");
+	if (ir)
+		cancel_delayed_work_sync(&ir->work);
+	cancel_delayed_work_sync(&dev->buttons_query_work);
+	/*
+	 * is canceling delayed work sufficient or does the rc event
+	 * kthread needs stopping? kthread is stopped in
+	 * ir_raw_event_unregister()
+	 */
+	return 0;
+}
+
+static int em28xx_ir_resume(struct em28xx *dev)
+{
+	struct em28xx_IR *ir = dev->ir;
+
+	if (dev->is_audio_only)
+		return 0;
+
+	dev_info(&dev->intf->dev, "Resuming input extension\n");
+	/*
+	 * if suspend calls ir_raw_event_unregister(), the should call
+	 * ir_raw_event_register()
+	 */
+	if (ir)
+		schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
+	if (dev->num_button_polling_addresses)
+		schedule_delayed_work(&dev->buttons_query_work,
+				      msecs_to_jiffies(dev->button_polling_interval));
+	return 0;
+}
+
+static struct em28xx_ops rc_ops = {
+	.id   = EM28XX_RC,
+	.name = "Em28xx Input Extension",
+	.init = em28xx_ir_init,
+	.fini = em28xx_ir_fini,
+	.suspend = em28xx_ir_suspend,
+	.resume = em28xx_ir_resume,
+};
+
+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 v2");
+MODULE_AUTHOR("Mauro Carvalho Chehab");
+MODULE_DESCRIPTION(DRIVER_DESC " - input interface");
+MODULE_VERSION(EM28XX_VERSION);
+
+module_init(em28xx_rc_register);
+module_exit(em28xx_rc_unregister);