drivers/media/usb/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 IS_ENABLED(CONFIG_I2C)
  17
  18 #include <linux/i2c.h>
  19 #include <linux/slab.h>
  20 #include <linux/export.h>
  21
  22 #include "hdpvr.h"
  23
  24 #define CTRL_READ_REQUEST       0xb8
  25 #define CTRL_WRITE_REQUEST      0x38
  26
  27 #define REQTYPE_I2C_READ        0xb1
  28 #define REQTYPE_I2C_WRITE       0xb0
  29 #define REQTYPE_I2C_WRITE_STATT 0xd0
  30
  31 #define Z8F0811_IR_TX_I2C_ADDR  0x70
  32 #define Z8F0811_IR_RX_I2C_ADDR  0x71
  33
  34
  35 struct i2c_client *hdpvr_register_ir_tx_i2c(struct hdpvr_device *dev)
  36 {
  37         struct IR_i2c_init_data *init_data = &dev->ir_i2c_init_data;
  38         struct i2c_board_info hdpvr_ir_tx_i2c_board_info = {
  39                 I2C_BOARD_INFO("ir_tx_z8f0811_hdpvr", Z8F0811_IR_TX_I2C_ADDR),
  40         };
  41
  42         init_data->name = "HD-PVR";
  43         hdpvr_ir_tx_i2c_board_info.platform_data = init_data;
  44
  45         return i2c_new_device(&dev->i2c_adapter, &hdpvr_ir_tx_i2c_board_info);
  46 }
  47
  48 struct i2c_client *hdpvr_register_ir_rx_i2c(struct hdpvr_device *dev)
  49 {
  50         struct IR_i2c_init_data *init_data = &dev->ir_i2c_init_data;
  51         struct i2c_board_info hdpvr_ir_rx_i2c_board_info = {
  52                 I2C_BOARD_INFO("ir_rx_z8f0811_hdpvr", Z8F0811_IR_RX_I2C_ADDR),
  53         };
  54
  55         /* Our default information for ir-kbd-i2c.c to use */
  56         init_data->ir_codes = RC_MAP_HAUPPAUGE;
  57         init_data->internal_get_key_func = IR_KBD_GET_KEY_HAUP_XVR;
  58         init_data->type = RC_BIT_RC5;
  59         init_data->name = "HD-PVR";
  60         init_data->polling_interval = 405; /* ms, duplicated from Windows */
  61         hdpvr_ir_rx_i2c_board_info.platform_data = init_data;
  62
  63         return i2c_new_device(&dev->i2c_adapter, &hdpvr_ir_rx_i2c_board_info);
  64 }
  65
  66 static int hdpvr_i2c_read(struct hdpvr_device *dev, int bus,
  67                           unsigned char addr, char *wdata, int wlen,
  68                           char *data, int len)
  69 {
  70         int ret;
  71
  72         if ((len > sizeof(dev->i2c_buf)) || (wlen > sizeof(dev->i2c_buf)))
  73                 return -EINVAL;
  74
  75         if (wlen) {
  76                 memcpy(&dev->i2c_buf, wdata, wlen);
  77                 ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
  78                                       REQTYPE_I2C_WRITE, CTRL_WRITE_REQUEST,
  79                                       (bus << 8) | addr, 0, &dev->i2c_buf,
  80                                       wlen, 1000);
  81                 if (ret < 0)
  82                         return ret;
  83         }
  84
  85         ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
  86                               REQTYPE_I2C_READ, CTRL_READ_REQUEST,
  87                               (bus << 8) | addr, 0, &dev->i2c_buf, len, 1000);
  88
  89         if (ret == len) {
  90                 memcpy(data, &dev->i2c_buf, len);
  91                 ret = 0;
  92         } else if (ret >= 0)
  93                 ret = -EIO;
  94
  95         return ret;
  96 }
  97
  98 static int hdpvr_i2c_write(struct hdpvr_device *dev, int bus,
  99                            unsigned char addr, char *data, int len)
 100 {
 101         int ret;
 102
 103         if (len > sizeof(dev->i2c_buf))
 104                 return -EINVAL;
 105
 106         memcpy(&dev->i2c_buf, data, len);
 107         ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
 108                               REQTYPE_I2C_WRITE, CTRL_WRITE_REQUEST,
 109                               (bus << 8) | addr, 0, &dev->i2c_buf, len, 1000);
 110
 111         if (ret < 0)
 112                 return ret;
 113
 114         ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
 115                               REQTYPE_I2C_WRITE_STATT, CTRL_READ_REQUEST,
 116                               0, 0, &dev->i2c_buf, 2, 1000);
 117
 118         if ((ret == 2) && (dev->i2c_buf[1] == (len - 1)))
 119                 ret = 0;
 120         else if (ret >= 0)
 121                 ret = -EIO;
 122
 123         return ret;
 124 }
 125
 126 static int hdpvr_transfer(struct i2c_adapter *i2c_adapter, struct i2c_msg *msgs,
 127                           int num)
 128 {
 129         struct hdpvr_device *dev = i2c_get_adapdata(i2c_adapter);
 130         int retval = 0, addr;
 131
 132         if (num <= 0)
 133                 return 0;
 134
 135         mutex_lock(&dev->i2c_mutex);
 136
 137         addr = msgs[0].addr << 1;
 138
 139         if (num == 1) {
 140                 if (msgs[0].flags & I2C_M_RD)
 141                         retval = hdpvr_i2c_read(dev, 1, addr, NULL, 0,
 142                                                 msgs[0].buf, msgs[0].len);
 143                 else
 144                         retval = hdpvr_i2c_write(dev, 1, addr, msgs[0].buf,
 145                                                  msgs[0].len);
 146         } else if (num == 2) {
 147                 if (msgs[0].addr != msgs[1].addr) {
 148                         v4l2_warn(&dev->v4l2_dev, "refusing 2-phase i2c xfer "
 149                                   "with conflicting target addresses\n");
 150                         retval = -EINVAL;
 151                         goto out;
 152                 }
 153
 154                 if ((msgs[0].flags & I2C_M_RD) || !(msgs[1].flags & I2C_M_RD)) {
 155                         v4l2_warn(&dev->v4l2_dev, "refusing complex xfer with "
 156                                   "r0=%d, r1=%d\n", msgs[0].flags & I2C_M_RD,
 157                                   msgs[1].flags & I2C_M_RD);
 158                         retval = -EINVAL;
 159                         goto out;
 160                 }
 161
 162                 /*
 163                  * Write followed by atomic read is the only complex xfer that
 164                  * we actually support here.
 165                  */
 166                 retval = hdpvr_i2c_read(dev, 1, addr, msgs[0].buf, msgs[0].len,
 167                                         msgs[1].buf, msgs[1].len);
 168         } else {
 169                 v4l2_warn(&dev->v4l2_dev, "refusing %d-phase i2c xfer\n", num);
 170         }
 171
 172 out:
 173         mutex_unlock(&dev->i2c_mutex);
 174
 175         return retval ? retval : num;
 176 }
 177
 178 static u32 hdpvr_functionality(struct i2c_adapter *adapter)
 179 {
 180         return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
 181 }
 182
 183 static struct i2c_algorithm hdpvr_algo = {
 184         .master_xfer   = hdpvr_transfer,
 185         .functionality = hdpvr_functionality,
 186 };
 187
 188 static struct i2c_adapter hdpvr_i2c_adapter_template = {
 189         .name   = "Hauppage HD PVR I2C",
 190         .owner  = THIS_MODULE,
 191         .algo   = &hdpvr_algo,
 192 };
 193
 194 static int hdpvr_activate_ir(struct hdpvr_device *dev)
 195 {
 196         char buffer[2];
 197
 198         mutex_lock(&dev->i2c_mutex);
 199
 200         hdpvr_i2c_read(dev, 0, 0x54, NULL, 0, buffer, 1);
 201
 202         buffer[0] = 0;
 203         buffer[1] = 0x8;
 204         hdpvr_i2c_write(dev, 1, 0x54, buffer, 2);
 205
 206         buffer[1] = 0x18;
 207         hdpvr_i2c_write(dev, 1, 0x54, buffer, 2);
 208
 209         mutex_unlock(&dev->i2c_mutex);
 210
 211         return 0;
 212 }
 213
 214 int hdpvr_register_i2c_adapter(struct hdpvr_device *dev)
 215 {
 216         int retval = -ENOMEM;
 217
 218         hdpvr_activate_ir(dev);
 219
 220         dev->i2c_adapter = hdpvr_i2c_adapter_template;
 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