1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // cx231xx IR glue driver |
3 | // |
4 | // Copyright (c) 2010 Mauro Carvalho Chehab <mchehab@kernel.org> |
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 | #include "cx231xx.h" |
12 | #include <linux/slab.h> |
13 | #include <linux/bitrev.h> |
14 | |
15 | #define MODULE_NAME "cx231xx-input" |
16 | |
17 | static int get_key_isdbt(struct IR_i2c *ir, enum rc_proto *protocol, |
18 | u32 *pscancode, u8 *toggle) |
19 | { |
20 | int rc; |
21 | u8 cmd, scancode; |
22 | |
23 | dev_dbg(&ir->rc->dev, "%s\n" , __func__); |
24 | |
25 | /* poll IR chip */ |
26 | rc = i2c_master_recv(client: ir->c, buf: &cmd, count: 1); |
27 | if (rc < 0) |
28 | return rc; |
29 | if (rc != 1) |
30 | return -EIO; |
31 | |
32 | /* it seems that 0xFE indicates that a button is still hold |
33 | down, while 0xff indicates that no button is hold |
34 | down. 0xfe sequences are sometimes interrupted by 0xFF */ |
35 | |
36 | if (cmd == 0xff) |
37 | return 0; |
38 | |
39 | scancode = bitrev8(cmd); |
40 | |
41 | dev_dbg(&ir->rc->dev, "cmd %02x, scan = %02x\n" , cmd, scancode); |
42 | |
43 | *protocol = RC_PROTO_OTHER; |
44 | *pscancode = scancode; |
45 | *toggle = 0; |
46 | return 1; |
47 | } |
48 | |
49 | int cx231xx_ir_init(struct cx231xx *dev) |
50 | { |
51 | struct i2c_board_info info; |
52 | u8 ir_i2c_bus; |
53 | |
54 | dev_dbg(dev->dev, "%s\n" , __func__); |
55 | |
56 | /* Only initialize if a rc keycode map is defined */ |
57 | if (!cx231xx_boards[dev->model].rc_map_name) |
58 | return -ENODEV; |
59 | |
60 | request_module("ir-kbd-i2c" ); |
61 | |
62 | memset(&info, 0, sizeof(struct i2c_board_info)); |
63 | memset(&dev->init_data, 0, sizeof(dev->init_data)); |
64 | dev->init_data.rc_dev = rc_allocate_device(RC_DRIVER_SCANCODE); |
65 | if (!dev->init_data.rc_dev) |
66 | return -ENOMEM; |
67 | |
68 | dev->init_data.name = cx231xx_boards[dev->model].name; |
69 | |
70 | strscpy(info.type, "ir_video" , I2C_NAME_SIZE); |
71 | info.platform_data = &dev->init_data; |
72 | |
73 | /* |
74 | * Board-dependent values |
75 | * |
76 | * For now, there's just one type of hardware design using |
77 | * an i2c device. |
78 | */ |
79 | dev->init_data.get_key = get_key_isdbt; |
80 | dev->init_data.ir_codes = cx231xx_boards[dev->model].rc_map_name; |
81 | /* The i2c micro-controller only outputs the cmd part of NEC protocol */ |
82 | dev->init_data.rc_dev->scancode_mask = 0xff; |
83 | dev->init_data.rc_dev->driver_name = "cx231xx" ; |
84 | dev->init_data.type = RC_PROTO_BIT_NEC; |
85 | info.addr = 0x30; |
86 | |
87 | /* Load and bind ir-kbd-i2c */ |
88 | ir_i2c_bus = cx231xx_boards[dev->model].ir_i2c_master; |
89 | dev_dbg(dev->dev, "Trying to bind ir at bus %d, addr 0x%02x\n" , |
90 | ir_i2c_bus, info.addr); |
91 | dev->ir_i2c_client = i2c_new_client_device( |
92 | adap: cx231xx_get_i2c_adap(dev, i2c_port: ir_i2c_bus), info: &info); |
93 | |
94 | return 0; |
95 | } |
96 | |
97 | void cx231xx_ir_exit(struct cx231xx *dev) |
98 | { |
99 | i2c_unregister_device(client: dev->ir_i2c_client); |
100 | dev->ir_i2c_client = NULL; |
101 | } |
102 | |