Linux 3.11-rc3
[cris-mirror.git] / drivers / media / usb / cx231xx / cx231xx-input.c
blob0f7b42446826b5922a2deea2b9ebb6a5f1ffbd79
1 /*
2 * cx231xx IR glue driver
4 * Copyright (C) 2010 Mauro Carvalho Chehab <mchehab@redhat.com>
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
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.
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.
21 #include "cx231xx.h"
22 #include <linux/usb.h>
23 #include <linux/slab.h>
25 #define MODULE_NAME "cx231xx-input"
27 static int get_key_isdbt(struct IR_i2c *ir, u32 *ir_key,
28 u32 *ir_raw)
30 int rc;
31 u8 cmd, scancode;
33 dev_dbg(&ir->rc->input_dev->dev, "%s\n", __func__);
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;
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 */
46 if (cmd == 0xff)
47 return 0;
49 scancode =
50 ((cmd & 0x01) ? 0x80 : 0) |
51 ((cmd & 0x02) ? 0x40 : 0) |
52 ((cmd & 0x04) ? 0x20 : 0) |
53 ((cmd & 0x08) ? 0x10 : 0) |
54 ((cmd & 0x10) ? 0x08 : 0) |
55 ((cmd & 0x20) ? 0x04 : 0) |
56 ((cmd & 0x40) ? 0x02 : 0) |
57 ((cmd & 0x80) ? 0x01 : 0);
59 dev_dbg(&ir->rc->input_dev->dev, "cmd %02x, scan = %02x\n",
60 cmd, scancode);
62 *ir_key = scancode;
63 *ir_raw = scancode;
64 return 1;
67 int cx231xx_ir_init(struct cx231xx *dev)
69 struct i2c_board_info info;
70 u8 ir_i2c_bus;
72 dev_dbg(&dev->udev->dev, "%s\n", __func__);
74 /* Only initialize if a rc keycode map is defined */
75 if (!cx231xx_boards[dev->model].rc_map_name)
76 return -ENODEV;
78 request_module("ir-kbd-i2c");
80 memset(&info, 0, sizeof(struct i2c_board_info));
81 memset(&dev->init_data, 0, sizeof(dev->init_data));
82 dev->init_data.rc_dev = rc_allocate_device();
83 if (!dev->init_data.rc_dev)
84 return -ENOMEM;
86 dev->init_data.name = cx231xx_boards[dev->model].name;
88 strlcpy(info.type, "ir_video", I2C_NAME_SIZE);
89 info.platform_data = &dev->init_data;
92 * Board-dependent values
94 * For now, there's just one type of hardware design using
95 * an i2c device.
97 dev->init_data.get_key = get_key_isdbt;
98 dev->init_data.ir_codes = cx231xx_boards[dev->model].rc_map_name;
99 /* The i2c micro-controller only outputs the cmd part of NEC protocol */
100 dev->init_data.rc_dev->scanmask = 0xff;
101 dev->init_data.rc_dev->driver_name = "cx231xx";
102 dev->init_data.type = RC_BIT_NEC;
103 info.addr = 0x30;
105 /* Load and bind ir-kbd-i2c */
106 ir_i2c_bus = cx231xx_boards[dev->model].ir_i2c_master;
107 dev_dbg(&dev->udev->dev, "Trying to bind ir at bus %d, addr 0x%02x\n",
108 ir_i2c_bus, info.addr);
109 dev->ir_i2c_client = i2c_new_device(&dev->i2c_bus[ir_i2c_bus].i2c_adap, &info);
111 return 0;
114 void cx231xx_ir_exit(struct cx231xx *dev)
116 if (dev->ir_i2c_client)
117 i2c_unregister_device(dev->ir_i2c_client);
118 dev->ir_i2c_client = NULL;