LXR linux/drivers/media/video/cx231xx/cx231xx-input.c

   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
  27static int get_key_isdbt(struct IR_i2c *ir, u32 *ir_key,
  28                         u32 *ir_raw)
  29{
  30        u8      cmd, scancode;
  31
  32        dev_dbg(&ir->rc->input_dev->dev, "%s\n", __func__);
  33
  34                /* poll IR chip */
  35        if (1 != i2c_master_recv(ir->c, &cmd, 1))
  36                return -EIO;
  37
  38        /* it seems that 0xFE indicates that a button is still hold
  39           down, while 0xff indicates that no button is hold
  40           down. 0xfe sequences are sometimes interrupted by 0xFF */
  41
  42        if (cmd == 0xff)
  43                return 0;
  44
  45        scancode =
  46                 ((cmd & 0x01) ? 0x80 : 0) |
  47                 ((cmd & 0x02) ? 0x40 : 0) |
  48                 ((cmd & 0x04) ? 0x20 : 0) |
  49                 ((cmd & 0x08) ? 0x10 : 0) |
  50                 ((cmd & 0x10) ? 0x08 : 0) |
  51                 ((cmd & 0x20) ? 0x04 : 0) |
  52                 ((cmd & 0x40) ? 0x02 : 0) |
  53                 ((cmd & 0x80) ? 0x01 : 0);
  54
  55        dev_dbg(&ir->rc->input_dev->dev, "cmd %02x, scan = %02x\n",
  56                cmd, scancode);
  57
  58        *ir_key = scancode;
  59        *ir_raw = scancode;
  60        return 1;
  61}
  62
  63int cx231xx_ir_init(struct cx231xx *dev)
  64{
  65        struct i2c_board_info info;
  66        u8 ir_i2c_bus;
  67
  68        dev_dbg(&dev->udev->dev, "%s\n", __func__);
  69
  70        /* Only initialize if a rc keycode map is defined */
  71        if (!cx231xx_boards[dev->model].rc_map_name)
  72                return -ENODEV;
  73
  74        request_module("ir-kbd-i2c");
  75
  76        memset(&info, 0, sizeof(struct i2c_board_info));
  77        memset(&dev->init_data, 0, sizeof(dev->init_data));
  78        dev->init_data.rc_dev = rc_allocate_device();
  79        if (!dev->init_data.rc_dev)
  80                return -ENOMEM;
  81
  82        dev->init_data.name = cx231xx_boards[dev->model].name;
  83
  84        strlcpy(info.type, "ir_video", I2C_NAME_SIZE);
  85        info.platform_data = &dev->init_data;
  86
  87        /*
  88         * Board-dependent values
  89         *
  90         * For now, there's just one type of hardware design using
  91         * an i2c device.
  92         */
  93        dev->init_data.get_key = get_key_isdbt;
  94        dev->init_data.ir_codes = cx231xx_boards[dev->model].rc_map_name;
  95        /* The i2c micro-controller only outputs the cmd part of NEC protocol */
  96        dev->init_data.rc_dev->scanmask = 0xff;
  97        dev->init_data.rc_dev->driver_name = "cx231xx";
  98        dev->init_data.type = RC_TYPE_NEC;
  99        info.addr = 0x30;
 100
 101        /* Load and bind ir-kbd-i2c */
 102        ir_i2c_bus = cx231xx_boards[dev->model].ir_i2c_master;
 103        dev_dbg(&dev->udev->dev, "Trying to bind ir at bus %d, addr 0x%02x\n",
 104                ir_i2c_bus, info.addr);
 105        i2c_new_device(&dev->i2c_bus[ir_i2c_bus].i2c_adap, &info);
 106
 107        return 0;
 108}
 109
 110void cx231xx_ir_exit(struct cx231xx *dev)
 111{
 112}
 113