Mauro Carvalho Chehab | 9ab6691 | 2010-10-23 13:28:33 -0300 | [diff] [blame] | 1 | /* |
| 2 | * cx231xx IR glue driver |
| 3 | * |
| 4 | * Copyright (C) 2010 Mauro Carvalho Chehab <mchehab@redhat.com> |
| 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 | |
| 25 | #define MODULE_NAME "cx231xx-input" |
| 26 | |
| 27 | static int get_key_isdbt(struct IR_i2c *ir, u32 *ir_key, |
| 28 | u32 *ir_raw) |
| 29 | { |
| 30 | u8 cmd; |
| 31 | |
| 32 | /* poll IR chip */ |
| 33 | if (1 != i2c_master_recv(ir->c, &cmd, 1)) |
| 34 | return -EIO; |
| 35 | |
| 36 | /* it seems that 0xFE indicates that a button is still hold |
| 37 | down, while 0xff indicates that no button is hold |
| 38 | down. 0xfe sequences are sometimes interrupted by 0xFF */ |
| 39 | |
| 40 | if (cmd == 0xff) |
| 41 | return 0; |
| 42 | |
| 43 | dev_dbg(&ir->input->dev, "scancode = %02x\n", cmd); |
| 44 | |
| 45 | *ir_key = cmd; |
| 46 | *ir_raw = cmd; |
| 47 | return 1; |
| 48 | } |
| 49 | |
| 50 | int cx231xx_ir_init(struct cx231xx *dev) |
| 51 | { |
| 52 | struct input_dev *input_dev; |
| 53 | struct i2c_board_info info; |
| 54 | int rc; |
| 55 | u8 ir_i2c_bus; |
| 56 | |
| 57 | dev_dbg(&dev->udev->dev, "%s\n", __func__); |
| 58 | |
| 59 | /* Only initialize if a rc keycode map is defined */ |
| 60 | if (!cx231xx_boards[dev->model].rc_map) |
| 61 | return -ENODEV; |
| 62 | |
| 63 | input_dev = input_allocate_device(); |
| 64 | if (!input_dev) |
| 65 | return -ENOMEM; |
| 66 | |
| 67 | request_module("ir-kbd-i2c"); |
| 68 | |
| 69 | memset(&info, 0, sizeof(struct i2c_board_info)); |
| 70 | memset(&dev->ir.init_data, 0, sizeof(dev->ir.init_data)); |
| 71 | |
| 72 | dev->ir.input_dev = input_dev; |
| 73 | dev->ir.init_data.name = cx231xx_boards[dev->model].name; |
| 74 | dev->ir.props.priv = dev; |
| 75 | dev->ir.props.allowed_protos = IR_TYPE_NEC; |
| 76 | snprintf(dev->ir.name, sizeof(dev->ir.name), |
| 77 | "cx231xx IR (%s)", cx231xx_boards[dev->model].name); |
| 78 | usb_make_path(dev->udev, dev->ir.phys, sizeof(dev->ir.phys)); |
| 79 | strlcat(dev->ir.phys, "/input0", sizeof(dev->ir.phys)); |
| 80 | |
| 81 | strlcpy(info.type, "ir_video", I2C_NAME_SIZE); |
| 82 | info.platform_data = &dev->ir.init_data; |
| 83 | |
| 84 | input_dev->name = dev->ir.name; |
| 85 | input_dev->phys = dev->ir.phys; |
| 86 | input_dev->dev.parent = &dev->udev->dev; |
| 87 | input_dev->id.bustype = BUS_USB; |
| 88 | input_dev->id.version = 1; |
| 89 | input_dev->id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor); |
| 90 | input_dev->id.product = le16_to_cpu(dev->udev->descriptor.idProduct); |
| 91 | |
| 92 | /* |
| 93 | * Board-dependent values |
| 94 | * |
| 95 | * For now, there's just one type of hardware design using |
| 96 | * an i2c device. |
| 97 | */ |
| 98 | dev->ir.init_data.get_key = get_key_isdbt; |
| 99 | dev->ir.init_data.ir_codes = cx231xx_boards[dev->model].rc_map; |
| 100 | /* The i2c micro-controller only outputs the cmd part of NEC protocol */ |
| 101 | dev->ir.props.scanmask = 0xff; |
| 102 | info.addr = 0x30; |
| 103 | |
| 104 | rc = ir_input_register(input_dev, cx231xx_boards[dev->model].rc_map, |
| 105 | &dev->ir.props, MODULE_NAME); |
| 106 | if (rc < 0) |
| 107 | return rc; |
| 108 | |
| 109 | /* Load and bind ir-kbd-i2c */ |
| 110 | ir_i2c_bus = cx231xx_boards[dev->model].ir_i2c_master; |
| 111 | i2c_new_device(&dev->i2c_bus[ir_i2c_bus].i2c_adap, &info); |
| 112 | |
| 113 | return rc; |
| 114 | } |
| 115 | |
| 116 | void cx231xx_ir_exit(struct cx231xx *dev) |
| 117 | { |
| 118 | if (dev->ir.input_dev) { |
| 119 | ir_input_unregister(dev->ir.input_dev); |
| 120 | dev->ir.input_dev = NULL; |
| 121 | } |
| 122 | } |