1/*
2 *   cx231xx IR glue driver
3 *
4 *   Copyright (C) 2010 Mauro Carvalho Chehab
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"
22#include <linux/slab.h>
23#include <linux/bitrev.h>
24
25#define MODULE_NAME "cx231xx-input"
26
27static int get_key_isdbt(struct IR_i2c *ir, enum rc_type *protocol,
28			 u32 *pscancode, u8 *toggle)
29{
30	int	rc;
31	u8	cmd, scancode;
32
33	dev_dbg(&ir->rc->input_dev->dev, "%s\n", __func__);
34
35		/* poll IR chip */
36	rc = i2c_master_recv(ir->c, &cmd, 1);
37	if (rc < 0)
38		return rc;
39	if (rc != 1)
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
49	scancode = bitrev8(cmd);
50
51	dev_dbg(&ir->rc->input_dev->dev, "cmd %02x, scan = %02x\n",
52		cmd, scancode);
53
54	*protocol = RC_TYPE_OTHER;
55	*pscancode = scancode;
56	*toggle = 0;
57	return 1;
58}
59
60int cx231xx_ir_init(struct cx231xx *dev)
61{
62	struct i2c_board_info info;
63	u8 ir_i2c_bus;
64
65	dev_dbg(dev->dev, "%s\n", __func__);
66
67	/* Only initialize if a rc keycode map is defined */
68	if (!cx231xx_boards[dev->model].rc_map_name)
69		return -ENODEV;
70
71	request_module("ir-kbd-i2c");
72
73	memset(&info, 0, sizeof(struct i2c_board_info));
74	memset(&dev->init_data, 0, sizeof(dev->init_data));
75	dev->init_data.rc_dev = rc_allocate_device();
76	if (!dev->init_data.rc_dev)
77		return -ENOMEM;
78
79	dev->init_data.name = cx231xx_boards[dev->model].name;
80
81	strlcpy(info.type, "ir_video", I2C_NAME_SIZE);
82	info.platform_data = &dev->init_data;
83
84	/*
85	 * Board-dependent values
86	 *
87	 * For now, there's just one type of hardware design using
88	 * an i2c device.
89	 */
90	dev->init_data.get_key = get_key_isdbt;
91	dev->init_data.ir_codes = cx231xx_boards[dev->model].rc_map_name;
92	/* The i2c micro-controller only outputs the cmd part of NEC protocol */
93	dev->init_data.rc_dev->scancode_mask = 0xff;
94	dev->init_data.rc_dev->driver_name = "cx231xx";
95	dev->init_data.type = RC_BIT_NEC;
96	info.addr = 0x30;
97
98	/* Load and bind ir-kbd-i2c */
99	ir_i2c_bus = cx231xx_boards[dev->model].ir_i2c_master;
100	dev_dbg(dev->dev, "Trying to bind ir at bus %d, addr 0x%02x\n",
101		ir_i2c_bus, info.addr);
102	dev->ir_i2c_client = i2c_new_device(
103		cx231xx_get_i2c_adap(dev, ir_i2c_bus), &info);
104
105	return 0;
106}
107
108void cx231xx_ir_exit(struct cx231xx *dev)
109{
110	if (dev->ir_i2c_client)
111		i2c_unregister_device(dev->ir_i2c_client);
112	dev->ir_i2c_client = NULL;
113}
114