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
  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 }