drivers/media/video/hdpvr/hdpvr-i2c.c

   1
   2 /*
   3  * Hauppauge HD PVR USB driver
   4  *
   5  * Copyright (C) 2008      Janne Grunau (j@jannau.net)
   6  *
   7  * IR device registration code is
   8  * Copyright (C) 2010   Andy Walls <awalls@md.metrocast.net>
   9  *
  10  *      This program is free software; you can redistribute it and/or
  11  *      modify it under the terms of the GNU General Public License as
  12  *      published by the Free Software Foundation, version 2.
  13  *
  14  */
  15
  16 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
  17
  18 #include <linux/i2c.h>
  19 #include <linux/slab.h>
  20
  21 #include "hdpvr.h"
  22
  23 #define CTRL_READ_REQUEST       0xb8
  24 #define CTRL_WRITE_REQUEST      0x38
  25
  26 #define REQTYPE_I2C_READ        0xb1
  27 #define REQTYPE_I2C_WRITE       0xb0
  28 #define REQTYPE_I2C_WRITE_STATT 0xd0
  29
  30 #define Z8F0811_IR_TX_I2C_ADDR  0x70
  31 #define Z8F0811_IR_RX_I2C_ADDR  0x71
  32
  33
  34 struct i2c_client *hdpvr_register_ir_tx_i2c(struct hdpvr_device *dev)
  35 {
  36         struct IR_i2c_init_data *init_data = &dev->ir_i2c_init_data;
  37         struct i2c_board_info hdpvr_ir_tx_i2c_board_info = {
  38                 I2C_BOARD_INFO("ir_tx_z8f0811_hdpvr", Z8F0811_IR_TX_I2C_ADDR),
  39         };
  40
  41         init_data->name = "HD-PVR";
  42         hdpvr_ir_tx_i2c_board_info.platform_data = init_data;
  43
  44         return i2c_new_device(&dev->i2c_adapter, &hdpvr_ir_tx_i2c_board_info);
  45 }
  46
  47 struct i2c_client *hdpvr_register_ir_rx_i2c(struct hdpvr_device *dev)
  48 {
  49         struct IR_i2c_init_data *init_data = &dev->ir_i2c_init_data;
  50         struct i2c_board_info hdpvr_ir_rx_i2c_board_info = {
  51                 I2C_BOARD_INFO("ir_rx_z8f0811_hdpvr", Z8F0811_IR_RX_I2C_ADDR),
  52         };
  53
  54         /* Our default information for ir-kbd-i2c.c to use */
  55         init_data->ir_codes = RC_MAP_HAUPPAUGE_NEW;
  56         init_data->internal_get_key_func = IR_KBD_GET_KEY_HAUP_XVR;
  57         init_data->type = RC_TYPE_RC5;
  58         init_data->name = "HD-PVR";
  59         hdpvr_ir_rx_i2c_board_info.platform_data = init_data;
  60
  61         return i2c_new_device(&dev->i2c_adapter, &hdpvr_ir_rx_i2c_board_info);
  62 }
  63
  64 static int hdpvr_i2c_read(struct hdpvr_device *dev, int bus,
  65                           unsigned char addr, char *data, int len)
  66 {
  67         int ret;
  68
  69         if (len > sizeof(dev->i2c_buf))
  70                 return -EINVAL;
  71
  72         ret = usb_control_msg(dev->udev,
  73                               usb_rcvctrlpipe(dev->udev, 0),
  74                               REQTYPE_I2C_READ, CTRL_READ_REQUEST,
  75                               (bus << 8) | addr, 0, &dev->i2c_buf, len, 1000);
  76
  77         if (ret == len) {
  78                 memcpy(data, &dev->i2c_buf, len);
  79                 ret = 0;
  80         } else if (ret >= 0)
  81                 ret = -EIO;
  82
  83         return ret;
  84 }
  85
  86 static int hdpvr_i2c_write(struct hdpvr_device *dev, int bus,
  87                            unsigned char addr, char *data, int len)
  88 {
  89         int ret;
  90
  91         if (len > sizeof(dev->i2c_buf))
  92                 return -EINVAL;
  93
  94         memcpy(&dev->i2c_buf, data, len);
  95         ret = usb_control_msg(dev->udev,
  96                               usb_sndctrlpipe(dev->udev, 0),
  97                               REQTYPE_I2C_WRITE, CTRL_WRITE_REQUEST,
  98                               (bus << 8) | addr, 0, &dev->i2c_buf, len, 1000);
  99
 100         if (ret < 0)
 101                 return ret;
 102
 103         ret = usb_control_msg(dev->udev,
 104                               usb_rcvctrlpipe(dev->udev, 0),
 105                               REQTYPE_I2C_WRITE_STATT, CTRL_READ_REQUEST,
 106                               0, 0, &dev->i2c_buf, 2, 1000);
 107
 108         if ((ret == 2) && (dev->i2c_buf[1] == (len - 1)))
 109                 ret = 0;
 110         else if (ret >= 0)
 111                 ret = -EIO;
 112
 113         return ret;
 114 }
 115
 116 static int hdpvr_transfer(struct i2c_adapter *i2c_adapter, struct i2c_msg *msgs,
 117                           int num)
 118 {
 119         struct hdpvr_device *dev = i2c_get_adapdata(i2c_adapter);
 120         int retval = 0, i, addr;
 121
 122         if (num <= 0)
 123                 return 0;
 124
 125         mutex_lock(&dev->i2c_mutex);
 126
 127         for (i = 0; i < num && !retval; i++) {
 128                 addr = msgs[i].addr << 1;
 129
 130                 if (msgs[i].flags & I2C_M_RD)
 131                         retval = hdpvr_i2c_read(dev, 1, addr, msgs[i].buf,
 132                                                 msgs[i].len);
 133                 else
 134                         retval = hdpvr_i2c_write(dev, 1, addr, msgs[i].buf,
 135                                                  msgs[i].len);
 136         }
 137
 138         mutex_unlock(&dev->i2c_mutex);
 139
 140         return retval ? retval : num;
 141 }
 142
 143 static u32 hdpvr_functionality(struct i2c_adapter *adapter)
 144 {
 145         return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
 146 }
 147
 148 static struct i2c_algorithm hdpvr_algo = {
 149         .master_xfer   = hdpvr_transfer,
 150         .functionality = hdpvr_functionality,
 151 };
 152
 153 static struct i2c_adapter hdpvr_i2c_adapter_template = {
 154         .name   = "Hauppage HD PVR I2C",
 155         .owner  = THIS_MODULE,
 156         .algo   = &hdpvr_algo,
 157 };
 158
 159 static int hdpvr_activate_ir(struct hdpvr_device *dev)
 160 {
 161         char buffer[8];
 162
 163         mutex_lock(&dev->i2c_mutex);
 164
 165         hdpvr_i2c_read(dev, 0, 0x54, buffer, 1);
 166
 167         buffer[0] = 0;
 168         buffer[1] = 0x8;
 169         hdpvr_i2c_write(dev, 1, 0x54, buffer, 2);
 170
 171         buffer[1] = 0x18;
 172         hdpvr_i2c_write(dev, 1, 0x54, buffer, 2);
 173
 174         mutex_unlock(&dev->i2c_mutex);
 175
 176         return 0;
 177 }
 178
 179 int hdpvr_register_i2c_adapter(struct hdpvr_device *dev)
 180 {
 181         int retval = -ENOMEM;
 182
 183         hdpvr_activate_ir(dev);
 184
 185         memcpy(&dev->i2c_adapter, &hdpvr_i2c_adapter_template,
 186                sizeof(struct i2c_adapter));
 187         dev->i2c_adapter.dev.parent = &dev->udev->dev;
 188
 189         i2c_set_adapdata(&dev->i2c_adapter, dev);
 190
 191         retval = i2c_add_adapter(&dev->i2c_adapter);
 192
 193         return retval;
 194 }
 195
 196 #endif