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/usb.h>
23#include <linux/slab.h>
24#include <linux/bitrev.h>
25
26#define MODULE_NAME "cx231xx-input"
27
28static int get_key_isdbt(struct IR_i2c *ir, enum rc_type *protocol,
29			 u32 *pscancode, u8 *toggle)
30{
31	int	rc;
32	u8	cmd, scancode;
33
34	dev_dbg(&ir->rc->input_dev->dev, "%s\n", __func__);
35
36		/* poll IR chip */
37	rc = i2c_master_recv(ir->c, &cmd, 1);
38	if (rc < 0)
39		return rc;
40	if (rc != 1)
41		return -EIO;
42
43	/* it seems that 0xFE indicates that a button is still hold
44	   down, while 0xff indicates that no button is hold
45	   down. 0xfe sequences are sometimes interrupted by 0xFF */
46
47	if (cmd == 0xff)
48		return 0;
49
50	scancode = bitrev8(cmd);
51
52	dev_dbg(&ir->rc->input_dev->dev, "cmd %02x, scan = %02x\n",
53		cmd, scancode);
54
55	*protocol = RC_TYPE_OTHER;
56	*pscancode = scancode;
57	*toggle = 0;
58	return 1;
59}
60
61int cx231xx_ir_init(struct cx231xx *dev)
62{
63	struct i2c_board_info info;
64	u8 ir_i2c_bus;
65
66	dev_dbg(&dev->udev->dev, "%s\n", __func__);
67
68	/* Only initialize if a rc keycode map is defined */
69	if (!cx231xx_boards[dev->model].rc_map_name)
70		return -ENODEV;
71
72	request_module("ir-kbd-i2c");
73
74	memset(&info, 0, sizeof(struct i2c_board_info));
75	memset(&dev->init_data, 0, sizeof(dev->init_data));
76	dev->init_data.rc_dev = rc_allocate_device();
77	if (!dev->init_data.rc_dev)
78		return -ENOMEM;
79
80	dev->init_data.name = cx231xx_boards[dev->model].name;
81
82	strlcpy(info.type, "ir_video", I2C_NAME_SIZE);
83	info.platform_data = &dev->init_data;
84
85	/*
86	 * Board-dependent values
87	 *
88	 * For now, there's just one type of hardware design using
89	 * an i2c device.
90	 */
91	dev->init_data.get_key = get_key_isdbt;
92	dev->init_data.ir_codes = cx231xx_boards[dev->model].rc_map_name;
93	/* The i2c micro-controller only outputs the cmd part of NEC protocol */
94	dev->init_data.rc_dev->scancode_mask = 0xff;
95	dev->init_data.rc_dev->driver_name = "cx231xx";
96	dev->init_data.type = RC_BIT_NEC;
97	info.addr = 0x30;
98
99	/* Load and bind ir-kbd-i2c */
100	ir_i2c_bus = cx231xx_boards[dev->model].ir_i2c_master;
101	dev_dbg(&dev->udev->dev, "Trying to bind ir at bus %d, addr 0x%02x\n",
102		ir_i2c_bus, info.addr);
103	dev->ir_i2c_client = i2c_new_device(&dev->i2c_bus[ir_i2c_bus].i2c_adap, &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