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;
  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         init_data->polling_interval = 405; /* ms, duplicated from Windows */
  60         hdpvr_ir_rx_i2c_board_info.platform_data = init_data;
  61
  62         return i2c_new_device(&dev->i2c_adapter, &hdpvr_ir_rx_i2c_board_info);
  63 }
  64
  65 static int hdpvr_i2c_read(struct hdpvr_device *dev, int bus,
  66                           unsigned char addr, char *wdata, int wlen,
  67                           char *data, int len)
  68 {
  69         int ret;
  70
  71         if ((len > sizeof(dev->i2c_buf)) || (wlen > sizeof(dev->i2c_buf)))
  72                 return -EINVAL;
  73
  74         if (wlen) {
  75                 memcpy(&dev->i2c_buf, wdata, wlen);
  76                 ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
  77                                       REQTYPE_I2C_WRITE, CTRL_WRITE_REQUEST,
  78                                       (bus << 8) | addr, 0, &dev->i2c_buf,
  79                                       wlen, 1000);
  80                 if (ret < 0)
  81                         return ret;
  82         }
  83
  84         ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
  85                               REQTYPE_I2C_READ, CTRL_READ_REQUEST,
  86                               (bus << 8) | addr, 0, &dev->i2c_buf, len, 1000);
  87
  88         if (ret == len) {
  89                 memcpy(data, &dev->i2c_buf, len);
  90                 ret = 0;
  91         } else if (ret >= 0)
  92                 ret = -EIO;
  93
  94         return ret;
  95 }
  96
  97 static int hdpvr_i2c_write(struct hdpvr_device *dev, int bus,
  98                            unsigned char addr, char *data, int len)
  99 {
 100         int ret;
 101
 102         if (len > sizeof(dev->i2c_buf))
 103                 return -EINVAL;
 104
 105         memcpy(&dev->i2c_buf, data, len);
 106         ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
 107                               REQTYPE_I2C_WRITE, CTRL_WRITE_REQUEST,
 108                               (bus << 8) | addr, 0, &dev->i2c_buf, len, 1000);
 109
 110         if (ret < 0)
 111                 return ret;
 112
 113         ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
 114                               REQTYPE_I2C_WRITE_STATT, CTRL_READ_REQUEST,
 115                               0, 0, &dev->i2c_buf, 2, 1000);
 116
 117         if ((ret == 2) && (dev->i2c_buf[1] == (len - 1)))
 118                 ret = 0;
 119         else if (ret >= 0)
 120                 ret = -EIO;
 121
 122         return ret;
 123 }
 124
 125 static int hdpvr_transfer(struct i2c_adapter *i2c_adapter, struct i2c_msg *msgs,
 126                           int num)
 127 {
 128         struct hdpvr_device *dev = i2c_get_adapdata(i2c_adapter);
 129         int retval = 0, addr;
 130
 131         if (num <= 0)
 132                 return 0;
 133
 134         mutex_lock(&dev->i2c_mutex);
 135
 136         addr = msgs[0].addr << 1;
 137
 138         if (num == 1) {
 139                 if (msgs[0].flags & I2C_M_RD)
 140                         retval = hdpvr_i2c_read(dev, 1, addr, NULL, 0,
 141                                                 msgs[0].buf, msgs[0].len);
 142                 else
 143                         retval = hdpvr_i2c_write(dev, 1, addr, msgs[0].buf,
 144                                                  msgs[0].len);
 145         } else if (num == 2) {
 146                 if (msgs[0].addr != msgs[1].addr) {
 147                         v4l2_warn(&dev->v4l2_dev, "refusing 2-phase i2c xfer "
 148                                   "with conflicting target addresses\n");
 149                         retval = -EINVAL;
 150                         goto out;
 151                 }
 152
 153                 if ((msgs[0].flags & I2C_M_RD) || !(msgs[1].flags & I2C_M_RD)) {
 154                         v4l2_warn(&dev->v4l2_dev, "refusing complex xfer with "
 155                                   "r0=%d, r1=%d\n", msgs[0].flags & I2C_M_RD,
 156                                   msgs[1].flags & I2C_M_RD);
 157                         retval = -EINVAL;
 158                         goto out;
 159                 }
 160
 161                 /*
 162                  * Write followed by atomic read is the only complex xfer that
 163                  * we actually support here.
 164                  */
 165                 retval = hdpvr_i2c_read(dev, 1, addr, msgs[0].buf, msgs[0].len,
 166                                         msgs[1].buf, msgs[1].len);
 167         } else {
 168                 v4l2_warn(&dev->v4l2_dev, "refusing %d-phase i2c xfer\n", num);
 169         }
 170
 171 out:
 172         mutex_unlock(&dev->i2c_mutex);
 173
 174         return retval ? retval : num;
 175 }
 176
 177 static u32 hdpvr_functionality(struct i2c_adapter *adapter)
 178 {
 179         return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
 180 }
 181
 182 static struct i2c_algorithm hdpvr_algo = {
 183         .master_xfer   = hdpvr_transfer,
 184         .functionality = hdpvr_functionality,
 185 };
 186
 187 static struct i2c_adapter hdpvr_i2c_adapter_template = {
 188         .name   = "Hauppage HD PVR I2C",
 189         .owner  = THIS_MODULE,
 190         .algo   = &hdpvr_algo,
 191 };
 192
 193 static int hdpvr_activate_ir(struct hdpvr_device *dev)
 194 {
 195         char buffer[2];
 196
 197         mutex_lock(&dev->i2c_mutex);
 198
 199         hdpvr_i2c_read(dev, 0, 0x54, NULL, 0, buffer, 1);
 200
 201         buffer[0] = 0;
 202         buffer[1] = 0x8;
 203         hdpvr_i2c_write(dev, 1, 0x54, buffer, 2);
 204
 205         buffer[1] = 0x18;
 206         hdpvr_i2c_write(dev, 1, 0x54, buffer, 2);
 207
 208         mutex_unlock(&dev->i2c_mutex);
 209
 210         return 0;
 211 }
 212
 213 int hdpvr_register_i2c_adapter(struct hdpvr_device *dev)
 214 {
 215         int retval = -ENOMEM;
 216
 217         hdpvr_activate_ir(dev);
 218
 219         memcpy(&dev->i2c_adapter, &hdpvr_i2c_adapter_template,
 220                sizeof(struct i2c_adapter));
 221         dev->i2c_adapter.dev.parent = &dev->udev->dev;
 222
 223         i2c_set_adapdata(&dev->i2c_adapter, dev);
 224
 225         retval = i2c_add_adapter(&dev->i2c_adapter);
 226
 227         return retval;
 228 }
 229
 230 #endif