drivers/media/pci/cx23885/cx23885-input.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *  Driver for the Conexant CX23885/7/8 PCIe bridge
  *
  *  Infrared remote control input device
  *
  *  Most of this file is
  *
  *  Copyright (C) 2009  Andy Walls <awalls@md.metrocast.net>
  *
  *  However, the cx23885_input_{init,fini} functions contained herein are
  *  derived from Linux kernel files linux/media/video/.../...-input.c marked as:
  *
  *  Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
  *  Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
  *		       Markus Rechberger <mrechberger@gmail.com>
  *		       Mauro Carvalho Chehab <mchehab@kernel.org>
  *		       Sascha Sommer <saschasommer@freenet.de>
  *  Copyright (C) 2004, 2005 Chris Pascoe
  *  Copyright (C) 2003, 2004 Gerd Knorr
  *  Copyright (C) 2003 Pavel Machek
  */

 #include "cx23885.h"
 #include "cx23885-input.h"

 #include <linux/slab.h>
 #include <media/rc-core.h>
 #include <media/v4l2-subdev.h>

 #define MODULE_NAME "cx23885"

 static void cx23885_input_process_measurements(struct cx23885_dev *dev,
 					       bool overrun)
 {
 	struct cx23885_kernel_ir *kernel_ir = dev->kernel_ir;

 	ssize_t num;
 	int count, i;
 	bool handle = false;
 	struct ir_raw_event ir_core_event[64];

 	do {
 		num = 0;
 		v4l2_subdev_call(dev->sd_ir, ir, rx_read, (u8 *) ir_core_event,
 				 sizeof(ir_core_event), &num);

 		count = num / sizeof(struct ir_raw_event);

 		for (i = 0; i < count; i++) {
 			ir_raw_event_store(kernel_ir->rc,
 					   &ir_core_event[i]);
 			handle = true;
 		}
 	} while (num != 0);

 	if (overrun)
 		ir_raw_event_overflow(kernel_ir->rc);
 	else if (handle)
 		ir_raw_event_handle(kernel_ir->rc);
 }

 void cx23885_input_rx_work_handler(struct cx23885_dev *dev, u32 events)
 {
 	struct v4l2_subdev_ir_parameters params;
 	int overrun, data_available;

 	if (dev->sd_ir == NULL || events == 0)
 		return;

 	switch (dev->board) {
 	case CX23885_BOARD_HAUPPAUGE_HVR1270:
 	case CX23885_BOARD_HAUPPAUGE_HVR1850:
 	case CX23885_BOARD_HAUPPAUGE_HVR1290:
 	case CX23885_BOARD_TERRATEC_CINERGY_T_PCIE_DUAL:
 	case CX23885_BOARD_TEVII_S470:
 	case CX23885_BOARD_HAUPPAUGE_HVR1250:
 	case CX23885_BOARD_MYGICA_X8507:
 	case CX23885_BOARD_TBS_6980:
 	case CX23885_BOARD_TBS_6981:
 	case CX23885_BOARD_DVBSKY_T9580:
 	case CX23885_BOARD_DVBSKY_T980C:
 	case CX23885_BOARD_DVBSKY_S950C:
 	case CX23885_BOARD_TT_CT2_4500_CI:
 	case CX23885_BOARD_DVBSKY_S950:
 	case CX23885_BOARD_DVBSKY_S952:
 	case CX23885_BOARD_DVBSKY_T982:
 	case CX23885_BOARD_HAUPPAUGE_HVR1265_K4:
 		/*
 		 * The only boards we handle right now.  However other boards
 		 * using the CX2388x integrated IR controller should be similar
 		 */
 		break;
 	default:
 		return;
 	}

 	overrun = events & (V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN |
 			    V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN);

 	data_available = events & (V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED |
 				   V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ);

 	if (overrun) {
 		/* If there was a FIFO overrun, stop the device */
 		v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, &params);
 		params.enable = false;
 		/* Mitigate race with cx23885_input_ir_stop() */
 		params.shutdown = atomic_read(&dev->ir_input_stopping);
 		v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, &params);
 	}

 	if (data_available)
 		cx23885_input_process_measurements(dev, overrun);

 	if (overrun) {
 		/* If there was a FIFO overrun, clear & restart the device */
 		params.enable = true;
 		/* Mitigate race with cx23885_input_ir_stop() */
 		params.shutdown = atomic_read(&dev->ir_input_stopping);
 		v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, &params);
 	}
 }

 static int cx23885_input_ir_start(struct cx23885_dev *dev)
 {
 	struct v4l2_subdev_ir_parameters params;

 	if (dev->sd_ir == NULL)
 		return -ENODEV;

 	atomic_set(&dev->ir_input_stopping, 0);

 	v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, &params);
 	switch (dev->board) {
 	case CX23885_BOARD_HAUPPAUGE_HVR1270:
 	case CX23885_BOARD_HAUPPAUGE_HVR1850:
 	case CX23885_BOARD_HAUPPAUGE_HVR1290:
 	case CX23885_BOARD_HAUPPAUGE_HVR1250:
 	case CX23885_BOARD_MYGICA_X8507:
 	case CX23885_BOARD_DVBSKY_T9580:
 	case CX23885_BOARD_DVBSKY_T980C:
 	case CX23885_BOARD_DVBSKY_S950C:
 	case CX23885_BOARD_TT_CT2_4500_CI:
 	case CX23885_BOARD_DVBSKY_S950:
 	case CX23885_BOARD_DVBSKY_S952:
 	case CX23885_BOARD_DVBSKY_T982:
 	case CX23885_BOARD_HAUPPAUGE_HVR1265_K4:
 		/*
 		 * The IR controller on this board only returns pulse widths.
 		 * Any other mode setting will fail to set up the device.
 		*/
 		params.mode = V4L2_SUBDEV_IR_MODE_PULSE_WIDTH;
 		params.enable = true;
 		params.interrupt_enable = true;
 		params.shutdown = false;

 		/* Setup for baseband compatible with both RC-5 and RC-6A */
 		params.modulation = false;
 		/* RC-5:  2,222,222 ns = 1/36 kHz * 32 cycles * 2 marks * 1.25*/
 		/* RC-6A: 3,333,333 ns = 1/36 kHz * 16 cycles * 6 marks * 1.25*/
 		params.max_pulse_width = 3333333; /* ns */
 		/* RC-5:    666,667 ns = 1/36 kHz * 32 cycles * 1 mark * 0.75 */
 		/* RC-6A:   333,333 ns = 1/36 kHz * 16 cycles * 1 mark * 0.75 */
 		params.noise_filter_min_width = 333333; /* ns */
 		/*
 		 * This board has inverted receive sense:
 		 * mark is received as low logic level;
 		 * falling edges are detected as rising edges; etc.
 		 */
 		params.invert_level = true;
 		break;
 	case CX23885_BOARD_TERRATEC_CINERGY_T_PCIE_DUAL:
 	case CX23885_BOARD_TEVII_S470:
 	case CX23885_BOARD_TBS_6980:
 	case CX23885_BOARD_TBS_6981:
 		/*
 		 * The IR controller on this board only returns pulse widths.
 		 * Any other mode setting will fail to set up the device.
 		 */
 		params.mode = V4L2_SUBDEV_IR_MODE_PULSE_WIDTH;
 		params.enable = true;
 		params.interrupt_enable = true;
 		params.shutdown = false;

 		/* Setup for a standard NEC protocol */
 		params.carrier_freq = 37917; /* Hz, 455 kHz/12 for NEC */
 		params.carrier_range_lower = 33000; /* Hz */
 		params.carrier_range_upper = 43000; /* Hz */
 		params.duty_cycle = 33; /* percent, 33 percent for NEC */

 		/*
 		 * NEC max pulse width: (64/3)/(455 kHz/12) * 16 nec_units
 		 * (64/3)/(455 kHz/12) * 16 nec_units * 1.375 = 12378022 ns
 		 */
 		params.max_pulse_width = 12378022; /* ns */

 		/*
 		 * NEC noise filter min width: (64/3)/(455 kHz/12) * 1 nec_unit
 		 * (64/3)/(455 kHz/12) * 1 nec_units * 0.625 = 351648 ns
 		 */
 		params.noise_filter_min_width = 351648; /* ns */

 		params.modulation = false;
 		params.invert_level = true;
 		break;
 	}
 	v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, &params);
 	return 0;
 }

 static int cx23885_input_ir_open(struct rc_dev *rc)
 {
 	struct cx23885_kernel_ir *kernel_ir = rc->priv;

 	if (kernel_ir->cx == NULL)
 		return -ENODEV;

 	return cx23885_input_ir_start(kernel_ir->cx);
 }

 static void cx23885_input_ir_stop(struct cx23885_dev *dev)
 {
 	struct v4l2_subdev_ir_parameters params;

 	if (dev->sd_ir == NULL)
 		return;

 	/*
 	 * Stop the sd_ir subdevice from generating notifications and
 	 * scheduling work.
 	 * It is shutdown this way in order to mitigate a race with
 	 * cx23885_input_rx_work_handler() in the overrun case, which could
 	 * re-enable the subdevice.
 	 */
 	atomic_set(&dev->ir_input_stopping, 1);
 	v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, &params);
 	while (params.shutdown == false) {
 		params.enable = false;
 		params.interrupt_enable = false;
 		params.shutdown = true;
 		v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, &params);
 		v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, &params);
 	}
 	flush_work(&dev->cx25840_work);
 	flush_work(&dev->ir_rx_work);
 	flush_work(&dev->ir_tx_work);
 }

 static void cx23885_input_ir_close(struct rc_dev *rc)
 {
 	struct cx23885_kernel_ir *kernel_ir = rc->priv;

 	if (kernel_ir->cx != NULL)
 		cx23885_input_ir_stop(kernel_ir->cx);
 }

 int cx23885_input_init(struct cx23885_dev *dev)
 {
 	struct cx23885_kernel_ir *kernel_ir;
 	struct rc_dev *rc;
 	char *rc_map;
 	u64 allowed_protos;

 	int ret;

 	/*
 	 * If the IR device (hardware registers, chip, GPIO lines, etc.) isn't
 	 * encapsulated in a v4l2_subdev, then I'm not going to deal with it.
 	 */
 	if (dev->sd_ir == NULL)
 		return -ENODEV;

 	switch (dev->board) {
 	case CX23885_BOARD_HAUPPAUGE_HVR1270:
 	case CX23885_BOARD_HAUPPAUGE_HVR1850:
 	case CX23885_BOARD_HAUPPAUGE_HVR1290:
 	case CX23885_BOARD_HAUPPAUGE_HVR1250:
 	case CX23885_BOARD_HAUPPAUGE_HVR1265_K4:
 		/* Integrated CX2388[58] IR controller */
 		allowed_protos = RC_PROTO_BIT_ALL_IR_DECODER;
 		/* The grey Hauppauge RC-5 remote */
 		rc_map = RC_MAP_HAUPPAUGE;
 		break;
 	case CX23885_BOARD_TERRATEC_CINERGY_T_PCIE_DUAL:
 		/* Integrated CX23885 IR controller */
 		allowed_protos = RC_PROTO_BIT_ALL_IR_DECODER;
 		/* The grey Terratec remote with orange buttons */
 		rc_map = RC_MAP_NEC_TERRATEC_CINERGY_XS;
 		break;
 	case CX23885_BOARD_TEVII_S470:
 		/* Integrated CX23885 IR controller */
 		allowed_protos = RC_PROTO_BIT_ALL_IR_DECODER;
 		/* A guess at the remote */
 		rc_map = RC_MAP_TEVII_NEC;
 		break;
 	case CX23885_BOARD_MYGICA_X8507:
 		/* Integrated CX23885 IR controller */
 		allowed_protos = RC_PROTO_BIT_ALL_IR_DECODER;
 		/* A guess at the remote */
 		rc_map = RC_MAP_TOTAL_MEDIA_IN_HAND_02;
 		break;
 	case CX23885_BOARD_TBS_6980:
 	case CX23885_BOARD_TBS_6981:
 		/* Integrated CX23885 IR controller */
 		allowed_protos = RC_PROTO_BIT_ALL_IR_DECODER;
 		/* A guess at the remote */
 		rc_map = RC_MAP_TBS_NEC;
 		break;
 	case CX23885_BOARD_DVBSKY_T9580:
 	case CX23885_BOARD_DVBSKY_T980C:
 	case CX23885_BOARD_DVBSKY_S950C:
 	case CX23885_BOARD_DVBSKY_S950:
 	case CX23885_BOARD_DVBSKY_S952:
 	case CX23885_BOARD_DVBSKY_T982:
 		/* Integrated CX23885 IR controller */
 		allowed_protos = RC_PROTO_BIT_ALL_IR_DECODER;
 		rc_map = RC_MAP_DVBSKY;
 		break;
 	case CX23885_BOARD_TT_CT2_4500_CI:
 		/* Integrated CX23885 IR controller */
 		allowed_protos = RC_PROTO_BIT_ALL_IR_DECODER;
 		rc_map = RC_MAP_TT_1500;
 		break;
 	default:
 		return -ENODEV;
 	}

 	/* cx23885 board instance kernel IR state */
 	kernel_ir = kzalloc(sizeof(struct cx23885_kernel_ir), GFP_KERNEL);
 	if (kernel_ir == NULL)
 		return -ENOMEM;

 	kernel_ir->cx = dev;
 	kernel_ir->name = kasprintf(GFP_KERNEL, "cx23885 IR (%s)",
 				    cx23885_boards[dev->board].name);
 	if (!kernel_ir->name) {
 		ret = -ENOMEM;
 		goto err_out_free;
 	}

 	kernel_ir->phys = kasprintf(GFP_KERNEL, "pci-%s/ir0",
 				    pci_name(dev->pci));
 	if (!kernel_ir->phys) {
 		ret = -ENOMEM;
 		goto err_out_free_name;
 	}

 	/* input device */
 	rc = rc_allocate_device(RC_DRIVER_IR_RAW);
 	if (!rc) {
 		ret = -ENOMEM;
 		goto err_out_free_phys;
 	}

 	kernel_ir->rc = rc;
 	rc->device_name = kernel_ir->name;
 	rc->input_phys = kernel_ir->phys;
 	rc->input_id.bustype = BUS_PCI;
 	rc->input_id.version = 1;
 	if (dev->pci->subsystem_vendor) {
 		rc->input_id.vendor  = dev->pci->subsystem_vendor;
 		rc->input_id.product = dev->pci->subsystem_device;
 	} else {
 		rc->input_id.vendor  = dev->pci->vendor;
 		rc->input_id.product = dev->pci->device;
 	}
 	rc->dev.parent = &dev->pci->dev;
 	rc->allowed_protocols = allowed_protos;
 	rc->priv = kernel_ir;
 	rc->open = cx23885_input_ir_open;
 	rc->close = cx23885_input_ir_close;
 	rc->map_name = rc_map;
 	rc->driver_name = MODULE_NAME;

 	/* Go */
 	dev->kernel_ir = kernel_ir;
 	ret = rc_register_device(rc);
 	if (ret)
 		goto err_out_stop;

 	return 0;

 err_out_stop:
 	cx23885_input_ir_stop(dev);
 	dev->kernel_ir = NULL;
 	rc_free_device(rc);
 err_out_free_phys:
 	kfree(kernel_ir->phys);
 err_out_free_name:
 	kfree(kernel_ir->name);
 err_out_free:
 	kfree(kernel_ir);
 	return ret;
 }

 void cx23885_input_fini(struct cx23885_dev *dev)
 {
 	/* Always stop the IR hardware from generating interrupts */
 	cx23885_input_ir_stop(dev);

 	if (dev->kernel_ir == NULL)
 		return;
 	rc_unregister_device(dev->kernel_ir->rc);
 	kfree(dev->kernel_ir->phys);
 	kfree(dev->kernel_ir->name);
 	kfree(dev->kernel_ir);
 	dev->kernel_ir = NULL;
 }
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* Driver for the Conexant CX23885/7/8 PCIe bridge
	*
	* Infrared remote control input device
	*
	* Most of this file is
	*
	* Copyright (C) 2009 Andy Walls <awalls@md.metrocast.net>
	*
	* However, the cx23885_input_{init,fini} functions contained herein are
	* derived from Linux kernel files linux/media/video/.../...-input.c marked as:
	*
	* Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
	* Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
	* Markus Rechberger <mrechberger@gmail.com>
	* Mauro Carvalho Chehab <mchehab@kernel.org>
	* Sascha Sommer <saschasommer@freenet.de>
	* Copyright (C) 2004, 2005 Chris Pascoe
	* Copyright (C) 2003, 2004 Gerd Knorr
	* Copyright (C) 2003 Pavel Machek
	*/

	#include "cx23885.h"
	#include "cx23885-input.h"

	#include <linux/slab.h>
	#include <media/rc-core.h>
	#include <media/v4l2-subdev.h>

	#define MODULE_NAME "cx23885"

	static void cx23885_input_process_measurements(struct cx23885_dev *dev,
	bool overrun)
	{
	struct cx23885_kernel_ir *kernel_ir = dev->kernel_ir;

	ssize_t num;
	int count, i;
	bool handle = false;
	struct ir_raw_event ir_core_event[64];

	do {
	num = 0;
	v4l2_subdev_call(dev->sd_ir, ir, rx_read, (u8 *) ir_core_event,
	sizeof(ir_core_event), &num);

	count = num / sizeof(struct ir_raw_event);

	for (i = 0; i < count; i++) {
	ir_raw_event_store(kernel_ir->rc,
	&ir_core_event[i]);
	handle = true;
	}
	} while (num != 0);

	if (overrun)
	ir_raw_event_overflow(kernel_ir->rc);
	else if (handle)
	ir_raw_event_handle(kernel_ir->rc);
	}

	void cx23885_input_rx_work_handler(struct cx23885_dev *dev, u32 events)
	{
	struct v4l2_subdev_ir_parameters params;
	int overrun, data_available;

	if (dev->sd_ir == NULL \|\| events == 0)
	return;

	switch (dev->board) {
	case CX23885_BOARD_HAUPPAUGE_HVR1270:
	case CX23885_BOARD_HAUPPAUGE_HVR1850:
	case CX23885_BOARD_HAUPPAUGE_HVR1290:
	case CX23885_BOARD_TERRATEC_CINERGY_T_PCIE_DUAL:
	case CX23885_BOARD_TEVII_S470:
	case CX23885_BOARD_HAUPPAUGE_HVR1250:
	case CX23885_BOARD_MYGICA_X8507:
	case CX23885_BOARD_TBS_6980:
	case CX23885_BOARD_TBS_6981:
	case CX23885_BOARD_DVBSKY_T9580:
	case CX23885_BOARD_DVBSKY_T980C:
	case CX23885_BOARD_DVBSKY_S950C:
	case CX23885_BOARD_TT_CT2_4500_CI:
	case CX23885_BOARD_DVBSKY_S950:
	case CX23885_BOARD_DVBSKY_S952:
	case CX23885_BOARD_DVBSKY_T982:
	case CX23885_BOARD_HAUPPAUGE_HVR1265_K4:
	/*
	* The only boards we handle right now. However other boards
	* using the CX2388x integrated IR controller should be similar
	*/
	break;
	default:
	return;
	}

	overrun = events & (V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN \|
	V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN);

	data_available = events & (V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED \|
	V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ);

	if (overrun) {
	/* If there was a FIFO overrun, stop the device */
	v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, &params);
	params.enable = false;
	/* Mitigate race with cx23885_input_ir_stop() */
	params.shutdown = atomic_read(&dev->ir_input_stopping);
	v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, &params);
	}

	if (data_available)
	cx23885_input_process_measurements(dev, overrun);

	if (overrun) {
	/* If there was a FIFO overrun, clear & restart the device */
	params.enable = true;
	/* Mitigate race with cx23885_input_ir_stop() */
	params.shutdown = atomic_read(&dev->ir_input_stopping);
	v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, &params);
	}
	}

	static int cx23885_input_ir_start(struct cx23885_dev *dev)
	{
	struct v4l2_subdev_ir_parameters params;

	if (dev->sd_ir == NULL)
	return -ENODEV;

	atomic_set(&dev->ir_input_stopping, 0);

	v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, &params);
	switch (dev->board) {
	case CX23885_BOARD_HAUPPAUGE_HVR1270:
	case CX23885_BOARD_HAUPPAUGE_HVR1850:
	case CX23885_BOARD_HAUPPAUGE_HVR1290:
	case CX23885_BOARD_HAUPPAUGE_HVR1250:
	case CX23885_BOARD_MYGICA_X8507:
	case CX23885_BOARD_DVBSKY_T9580:
	case CX23885_BOARD_DVBSKY_T980C:
	case CX23885_BOARD_DVBSKY_S950C:
	case CX23885_BOARD_TT_CT2_4500_CI:
	case CX23885_BOARD_DVBSKY_S950:
	case CX23885_BOARD_DVBSKY_S952:
	case CX23885_BOARD_DVBSKY_T982:
	case CX23885_BOARD_HAUPPAUGE_HVR1265_K4:
	/*
	* The IR controller on this board only returns pulse widths.
	* Any other mode setting will fail to set up the device.
	*/
	params.mode = V4L2_SUBDEV_IR_MODE_PULSE_WIDTH;
	params.enable = true;
	params.interrupt_enable = true;
	params.shutdown = false;

	/* Setup for baseband compatible with both RC-5 and RC-6A */
	params.modulation = false;
	/* RC-5: 2,222,222 ns = 1/36 kHz * 32 cycles * 2 marks * 1.25*/
	/* RC-6A: 3,333,333 ns = 1/36 kHz * 16 cycles * 6 marks * 1.25*/
	params.max_pulse_width = 3333333; /* ns */
	/* RC-5: 666,667 ns = 1/36 kHz * 32 cycles * 1 mark * 0.75 */
	/* RC-6A: 333,333 ns = 1/36 kHz * 16 cycles * 1 mark * 0.75 */
	params.noise_filter_min_width = 333333; /* ns */
	/*
	* This board has inverted receive sense:
	* mark is received as low logic level;
	* falling edges are detected as rising edges; etc.
	*/
	params.invert_level = true;
	break;
	case CX23885_BOARD_TERRATEC_CINERGY_T_PCIE_DUAL:
	case CX23885_BOARD_TEVII_S470:
	case CX23885_BOARD_TBS_6980:
	case CX23885_BOARD_TBS_6981:
	/*
	* The IR controller on this board only returns pulse widths.
	* Any other mode setting will fail to set up the device.
	*/
	params.mode = V4L2_SUBDEV_IR_MODE_PULSE_WIDTH;
	params.enable = true;
	params.interrupt_enable = true;
	params.shutdown = false;

	/* Setup for a standard NEC protocol */
	params.carrier_freq = 37917; /* Hz, 455 kHz/12 for NEC */
	params.carrier_range_lower = 33000; /* Hz */
	params.carrier_range_upper = 43000; /* Hz */
	params.duty_cycle = 33; /* percent, 33 percent for NEC */

	/*
	* NEC max pulse width: (64/3)/(455 kHz/12) * 16 nec_units
	* (64/3)/(455 kHz/12) * 16 nec_units * 1.375 = 12378022 ns
	*/
	params.max_pulse_width = 12378022; /* ns */

	/*
	* NEC noise filter min width: (64/3)/(455 kHz/12) * 1 nec_unit
	* (64/3)/(455 kHz/12) * 1 nec_units * 0.625 = 351648 ns
	*/
	params.noise_filter_min_width = 351648; /* ns */

	params.modulation = false;
	params.invert_level = true;
	break;
	}
	v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, &params);
	return 0;
	}

	static int cx23885_input_ir_open(struct rc_dev *rc)
	{
	struct cx23885_kernel_ir *kernel_ir = rc->priv;

	if (kernel_ir->cx == NULL)
	return -ENODEV;

	return cx23885_input_ir_start(kernel_ir->cx);
	}

	static void cx23885_input_ir_stop(struct cx23885_dev *dev)
	{
	struct v4l2_subdev_ir_parameters params;

	if (dev->sd_ir == NULL)
	return;

	/*
	* Stop the sd_ir subdevice from generating notifications and
	* scheduling work.
	* It is shutdown this way in order to mitigate a race with
	* cx23885_input_rx_work_handler() in the overrun case, which could
	* re-enable the subdevice.
	*/
	atomic_set(&dev->ir_input_stopping, 1);
	v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, &params);
	while (params.shutdown == false) {
	params.enable = false;
	params.interrupt_enable = false;
	params.shutdown = true;
	v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, &params);
	v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, &params);
	}
	flush_work(&dev->cx25840_work);
	flush_work(&dev->ir_rx_work);
	flush_work(&dev->ir_tx_work);
	}

	static void cx23885_input_ir_close(struct rc_dev *rc)
	{
	struct cx23885_kernel_ir *kernel_ir = rc->priv;

	if (kernel_ir->cx != NULL)
	cx23885_input_ir_stop(kernel_ir->cx);
	}

	int cx23885_input_init(struct cx23885_dev *dev)
	{
	struct cx23885_kernel_ir *kernel_ir;
	struct rc_dev *rc;
	char *rc_map;
	u64 allowed_protos;

	int ret;

	/*
	* If the IR device (hardware registers, chip, GPIO lines, etc.) isn't
	* encapsulated in a v4l2_subdev, then I'm not going to deal with it.
	*/
	if (dev->sd_ir == NULL)
	return -ENODEV;

	switch (dev->board) {
	case CX23885_BOARD_HAUPPAUGE_HVR1270:
	case CX23885_BOARD_HAUPPAUGE_HVR1850:
	case CX23885_BOARD_HAUPPAUGE_HVR1290:
	case CX23885_BOARD_HAUPPAUGE_HVR1250:
	case CX23885_BOARD_HAUPPAUGE_HVR1265_K4:
	/* Integrated CX2388[58] IR controller */
	allowed_protos = RC_PROTO_BIT_ALL_IR_DECODER;
	/* The grey Hauppauge RC-5 remote */
	rc_map = RC_MAP_HAUPPAUGE;
	break;
	case CX23885_BOARD_TERRATEC_CINERGY_T_PCIE_DUAL:
	/* Integrated CX23885 IR controller */
	allowed_protos = RC_PROTO_BIT_ALL_IR_DECODER;
	/* The grey Terratec remote with orange buttons */
	rc_map = RC_MAP_NEC_TERRATEC_CINERGY_XS;
	break;
	case CX23885_BOARD_TEVII_S470:
	/* Integrated CX23885 IR controller */
	allowed_protos = RC_PROTO_BIT_ALL_IR_DECODER;
	/* A guess at the remote */
	rc_map = RC_MAP_TEVII_NEC;
	break;
	case CX23885_BOARD_MYGICA_X8507:
	/* Integrated CX23885 IR controller */
	allowed_protos = RC_PROTO_BIT_ALL_IR_DECODER;
	/* A guess at the remote */
	rc_map = RC_MAP_TOTAL_MEDIA_IN_HAND_02;
	break;
	case CX23885_BOARD_TBS_6980:
	case CX23885_BOARD_TBS_6981:
	/* Integrated CX23885 IR controller */
	allowed_protos = RC_PROTO_BIT_ALL_IR_DECODER;
	/* A guess at the remote */
	rc_map = RC_MAP_TBS_NEC;
	break;
	case CX23885_BOARD_DVBSKY_T9580:
	case CX23885_BOARD_DVBSKY_T980C:
	case CX23885_BOARD_DVBSKY_S950C:
	case CX23885_BOARD_DVBSKY_S950:
	case CX23885_BOARD_DVBSKY_S952:
	case CX23885_BOARD_DVBSKY_T982:
	/* Integrated CX23885 IR controller */
	allowed_protos = RC_PROTO_BIT_ALL_IR_DECODER;
	rc_map = RC_MAP_DVBSKY;
	break;
	case CX23885_BOARD_TT_CT2_4500_CI:
	/* Integrated CX23885 IR controller */
	allowed_protos = RC_PROTO_BIT_ALL_IR_DECODER;
	rc_map = RC_MAP_TT_1500;
	break;
	default:
	return -ENODEV;
	}

	/* cx23885 board instance kernel IR state */
	kernel_ir = kzalloc(sizeof(struct cx23885_kernel_ir), GFP_KERNEL);
	if (kernel_ir == NULL)
	return -ENOMEM;

	kernel_ir->cx = dev;
	kernel_ir->name = kasprintf(GFP_KERNEL, "cx23885 IR (%s)",
	cx23885_boards[dev->board].name);
	if (!kernel_ir->name) {
	ret = -ENOMEM;
	goto err_out_free;
	}

	kernel_ir->phys = kasprintf(GFP_KERNEL, "pci-%s/ir0",
	pci_name(dev->pci));
	if (!kernel_ir->phys) {
	ret = -ENOMEM;
	goto err_out_free_name;
	}

	/* input device */
	rc = rc_allocate_device(RC_DRIVER_IR_RAW);
	if (!rc) {
	ret = -ENOMEM;
	goto err_out_free_phys;
	}

	kernel_ir->rc = rc;
	rc->device_name = kernel_ir->name;
	rc->input_phys = kernel_ir->phys;
	rc->input_id.bustype = BUS_PCI;
	rc->input_id.version = 1;
	if (dev->pci->subsystem_vendor) {
	rc->input_id.vendor = dev->pci->subsystem_vendor;
	rc->input_id.product = dev->pci->subsystem_device;
	} else {
	rc->input_id.vendor = dev->pci->vendor;
	rc->input_id.product = dev->pci->device;
	}
	rc->dev.parent = &dev->pci->dev;
	rc->allowed_protocols = allowed_protos;
	rc->priv = kernel_ir;
	rc->open = cx23885_input_ir_open;
	rc->close = cx23885_input_ir_close;
	rc->map_name = rc_map;
	rc->driver_name = MODULE_NAME;

	/* Go */
	dev->kernel_ir = kernel_ir;
	ret = rc_register_device(rc);
	if (ret)
	goto err_out_stop;

	return 0;

	err_out_stop:
	cx23885_input_ir_stop(dev);
	dev->kernel_ir = NULL;
	rc_free_device(rc);
	err_out_free_phys:
	kfree(kernel_ir->phys);
	err_out_free_name:
	kfree(kernel_ir->name);
	err_out_free:
	kfree(kernel_ir);
	return ret;
	}

	void cx23885_input_fini(struct cx23885_dev *dev)
	{
	/* Always stop the IR hardware from generating interrupts */
	cx23885_input_ir_stop(dev);

	if (dev->kernel_ir == NULL)
	return;
	rc_unregister_device(dev->kernel_ir->rc);
	kfree(dev->kernel_ir->phys);
	kfree(dev->kernel_ir->name);
	kfree(dev->kernel_ir);
	dev->kernel_ir = NULL;
	}