[mirror_ubuntu-artful-kernel.git] / drivers / media / usb / cx231xx / cx231xx-input.c

/*
 *   cx231xx IR glue driver
 *
 *   Copyright (C) 2010 Mauro Carvalho Chehab
 *
 *   Polaris (cx231xx) has its support for IR's with a design close to MCE.
 *   however, a few designs are using an external I2C chip for IR, instead
 *   of using the one provided by the chip.
 *   This driver provides support for those extra devices
 *
 *   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 version 2.
 *
 *   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.
 */

#include "cx231xx.h"
#include <linux/slab.h>
#include <linux/bitrev.h>

#define MODULE_NAME "cx231xx-input"

static int get_key_isdbt(struct IR_i2c *ir, enum rc_type *protocol,
			 u32 *pscancode, u8 *toggle)
{
	int	rc;
	u8	cmd, scancode;

	dev_dbg(&ir->rc->input_dev->dev, "%s\n", __func__);

		/* poll IR chip */
	rc = i2c_master_recv(ir->c, &cmd, 1);
	if (rc < 0)
		return rc;
	if (rc != 1)
		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 */

	if (cmd == 0xff)
		return 0;

	scancode = bitrev8(cmd);

	dev_dbg(&ir->rc->input_dev->dev, "cmd %02x, scan = %02x\n",
		cmd, scancode);

	*protocol = RC_TYPE_OTHER;
	*pscancode = scancode;
	*toggle = 0;
	return 1;
}

int cx231xx_ir_init(struct cx231xx *dev)
{
	struct i2c_board_info info;
	u8 ir_i2c_bus;

	dev_dbg(dev->dev, "%s\n", __func__);

	/* Only initialize if a rc keycode map is defined */
	if (!cx231xx_boards[dev->model].rc_map_name)
		return -ENODEV;

	request_module("ir-kbd-i2c");

	memset(&info, 0, sizeof(struct i2c_board_info));
	memset(&dev->init_data, 0, sizeof(dev->init_data));
	dev->init_data.rc_dev = rc_allocate_device(RC_DRIVER_SCANCODE);
	if (!dev->init_data.rc_dev)
		return -ENOMEM;

	dev->init_data.name = cx231xx_boards[dev->model].name;

	strlcpy(info.type, "ir_video", I2C_NAME_SIZE);
	info.platform_data = &dev->init_data;

	/*
	 * Board-dependent values
	 *
	 * For now, there's just one type of hardware design using
	 * an i2c device.
	 */
	dev->init_data.get_key = get_key_isdbt;
	dev->init_data.ir_codes = cx231xx_boards[dev->model].rc_map_name;
	/* The i2c micro-controller only outputs the cmd part of NEC protocol */
	dev->init_data.rc_dev->scancode_mask = 0xff;
	dev->init_data.rc_dev->driver_name = "cx231xx";
	dev->init_data.type = RC_BIT_NEC;
	info.addr = 0x30;

	/* Load and bind ir-kbd-i2c */
	ir_i2c_bus = cx231xx_boards[dev->model].ir_i2c_master;
	dev_dbg(dev->dev, "Trying to bind ir at bus %d, addr 0x%02x\n",
		ir_i2c_bus, info.addr);
	dev->ir_i2c_client = i2c_new_device(
		cx231xx_get_i2c_adap(dev, ir_i2c_bus), &info);

	return 0;
}

void cx231xx_ir_exit(struct cx231xx *dev)
{
	if (dev->ir_i2c_client)
		i2c_unregister_device(dev->ir_i2c_client);
	dev->ir_i2c_client = NULL;
}
Commit	Line	Data
9ab66912 MCC	1	/*
	2	* cx231xx IR glue driver
	3	*
37e59f87	4	* Copyright (C) 2010 Mauro Carvalho Chehab
9ab66912 MCC	5	*
	6	* Polaris (cx231xx) has its support for IR's with a design close to MCE.
	7	* however, a few designs are using an external I2C chip for IR, instead
	8	* of using the one provided by the chip.
	9	* This driver provides support for those extra devices
	10	*
	11	* This program is free software; you can redistribute it and/or
	12	* modify it under the terms of the GNU General Public License as
	13	* published by the Free Software Foundation version 2.
	14	*
	15	* This program is distributed in the hope that it will be useful,
	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	18	* General Public License for more details.
	19	*/
	20
	21	#include "cx231xx.h"
9ab66912	22	#include <linux/slab.h>
4dd9bb91	23	#include <linux/bitrev.h>
9ab66912 MCC	24
	25	#define MODULE_NAME "cx231xx-input"
	26
4dd9bb91 DH	27	static int get_key_isdbt(struct IR_i2c ir, enum rc_type protocol,
4dd9bb91 DH	28	u32 pscancode, u8 toggle)
9ab66912	29	{
90bf3aab	30	int rc;
e330289e	31	u8 cmd, scancode;
9ab66912	32
141bb0dc MCC	33	dev_dbg(&ir->rc->input_dev->dev, "%s\n", __func__);
141bb0dc MCC	34
9ab66912	35	/* poll IR chip */
90bf3aab MCC	36	rc = i2c_master_recv(ir->c, &cmd, 1);
	37	if (rc < 0)
	38	return rc;
	39	if (rc != 1)
9ab66912 MCC	40	return -EIO;
	41
	42	/* it seems that 0xFE indicates that a button is still hold
	43	down, while 0xff indicates that no button is hold
	44	down. 0xfe sequences are sometimes interrupted by 0xFF */
	45
	46	if (cmd == 0xff)
	47	return 0;
	48
4dd9bb91	49	scancode = bitrev8(cmd);
9ab66912	50
e330289e MCC	51	dev_dbg(&ir->rc->input_dev->dev, "cmd %02x, scan = %02x\n",
	52	cmd, scancode);
	53
4dd9bb91 DH	54	*protocol = RC_TYPE_OTHER;
	55	*pscancode = scancode;
	56	*toggle = 0;
9ab66912 MCC	57	return 1;
	58	}
	59
	60	int cx231xx_ir_init(struct cx231xx *dev)
	61	{
9ab66912	62	struct i2c_board_info info;
9ab66912 MCC	63	u8 ir_i2c_bus;
9ab66912 MCC	64
336fea92	65	dev_dbg(dev->dev, "%s\n", __func__);
9ab66912 MCC	66
9ab66912 MCC	67	/* Only initialize if a rc keycode map is defined */
29e3ec19	68	if (!cx231xx_boards[dev->model].rc_map_name)
9ab66912 MCC	69	return -ENODEV;
9ab66912 MCC	70
9ab66912 MCC	71	request_module("ir-kbd-i2c");
	72
	73	memset(&info, 0, sizeof(struct i2c_board_info));
141bb0dc	74	memset(&dev->init_data, 0, sizeof(dev->init_data));
0f7499fd	75	dev->init_data.rc_dev = rc_allocate_device(RC_DRIVER_SCANCODE);
141bb0dc MCC	76	if (!dev->init_data.rc_dev)
141bb0dc MCC	77	return -ENOMEM;
9ab66912	78
141bb0dc	79	dev->init_data.name = cx231xx_boards[dev->model].name;
9ab66912 MCC	80
9ab66912 MCC	81	strlcpy(info.type, "ir_video", I2C_NAME_SIZE);
141bb0dc	82	info.platform_data = &dev->init_data;
9ab66912 MCC	83
	84	/*
	85	* Board-dependent values
	86	*
	87	* For now, there's just one type of hardware design using
	88	* an i2c device.
	89	*/
141bb0dc	90	dev->init_data.get_key = get_key_isdbt;
29e3ec19	91	dev->init_data.ir_codes = cx231xx_boards[dev->model].rc_map_name;
9ab66912	92	/* The i2c micro-controller only outputs the cmd part of NEC protocol */
9d2f1d3c	93	dev->init_data.rc_dev->scancode_mask = 0xff;
141bb0dc	94	dev->init_data.rc_dev->driver_name = "cx231xx";
c003ab1b	95	dev->init_data.type = RC_BIT_NEC;
9ab66912 MCC	96	info.addr = 0x30;
9ab66912 MCC	97
9ab66912 MCC	98	/* Load and bind ir-kbd-i2c */
9ab66912 MCC	99	ir_i2c_bus = cx231xx_boards[dev->model].ir_i2c_master;
336fea92	100	dev_dbg(dev->dev, "Trying to bind ir at bus %d, addr 0x%02x\n",
141bb0dc	101	ir_i2c_bus, info.addr);
c3c3f1ae MS	102	dev->ir_i2c_client = i2c_new_device(
c3c3f1ae MS	103	cx231xx_get_i2c_adap(dev, ir_i2c_bus), &info);
9ab66912	104
141bb0dc	105	return 0;
9ab66912 MCC	106	}
	107
	108	void cx231xx_ir_exit(struct cx231xx *dev)
	109	{
7528cd27 MCC	110	if (dev->ir_i2c_client)
	111	i2c_unregister_device(dev->ir_i2c_client);
	112	dev->ir_i2c_client = NULL;
9ab66912	113	}