drivers/media/video/cs5345.c

   1 /*
   2  * cs5345 Cirrus Logic 24-bit, 192 kHz Stereo Audio ADC
   3  * Copyright (C) 2007 Hans Verkuil
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19
  20
  21 #include <linux/version.h>
  22 #include <linux/module.h>
  23 #include <linux/kernel.h>
  24 #include <linux/i2c.h>
  25 #include <linux/videodev2.h>
  26 #include <media/v4l2-i2c-drv.h>
  27 #include <media/v4l2-common.h>
  28 #include <media/v4l2-chip-ident.h>
  29
  30 MODULE_DESCRIPTION("i2c device driver for cs5345 Audio ADC");
  31 MODULE_AUTHOR("Hans Verkuil");
  32 MODULE_LICENSE("GPL");
  33
  34 static int debug;
  35
  36 module_param(debug, bool, 0644);
  37
  38 MODULE_PARM_DESC(debug, "Debugging messages\n\t\t\t0=Off (default), 1=On");
  39
  40
  41 /* ----------------------------------------------------------------------- */
  42
  43 static inline int cs5345_write(struct i2c_client *client, u8 reg, u8 value)
  44 {
  45         return i2c_smbus_write_byte_data(client, reg, value);
  46 }
  47
  48 static inline int cs5345_read(struct i2c_client *client, u8 reg)
  49 {
  50         return i2c_smbus_read_byte_data(client, reg);
  51 }
  52
  53 static int cs5345_command(struct i2c_client *client, unsigned cmd, void *arg)
  54 {
  55         struct v4l2_routing *route = arg;
  56         struct v4l2_control *ctrl = arg;
  57
  58         switch (cmd) {
  59         case VIDIOC_INT_G_AUDIO_ROUTING:
  60                 route->input = cs5345_read(client, 0x09) & 7;
  61                 route->input |= cs5345_read(client, 0x05) & 0x70;
  62                 route->output = 0;
  63                 break;
  64
  65         case VIDIOC_INT_S_AUDIO_ROUTING:
  66                 if ((route->input & 0xf) > 6) {
  67                         v4l_err(client, "Invalid input %d.\n", route->input);
  68                         return -EINVAL;
  69                 }
  70                 cs5345_write(client, 0x09, route->input & 0xf);
  71                 cs5345_write(client, 0x05, route->input & 0xf0);
  72                 break;
  73
  74         case VIDIOC_G_CTRL:
  75                 if (ctrl->id == V4L2_CID_AUDIO_MUTE) {
  76                         ctrl->value = (cs5345_read(client, 0x04) & 0x08) != 0;
  77                         break;
  78                 }
  79                 if (ctrl->id != V4L2_CID_AUDIO_VOLUME)
  80                         return -EINVAL;
  81                 ctrl->value = cs5345_read(client, 0x07) & 0x3f;
  82                 if (ctrl->value >= 32)
  83                         ctrl->value = ctrl->value - 64;
  84                 break;
  85
  86         case VIDIOC_S_CTRL:
  87                 break;
  88                 if (ctrl->id == V4L2_CID_AUDIO_MUTE) {
  89                         cs5345_write(client, 0x04, ctrl->value ? 0x80 : 0);
  90                         break;
  91                 }
  92                 if (ctrl->id != V4L2_CID_AUDIO_VOLUME)
  93                         return -EINVAL;
  94                 if (ctrl->value > 24 || ctrl->value < -24)
  95                         return -EINVAL;
  96                 cs5345_write(client, 0x07, ((u8)ctrl->value) & 0x3f);
  97                 cs5345_write(client, 0x08, ((u8)ctrl->value) & 0x3f);
  98                 break;
  99
 100 #ifdef CONFIG_VIDEO_ADV_DEBUG
 101         case VIDIOC_DBG_G_REGISTER:
 102         case VIDIOC_DBG_S_REGISTER:
 103         {
 104                 struct v4l2_register *reg = arg;
 105
 106                 if (!v4l2_chip_match_i2c_client(client,
 107                                         reg->match_type, reg->match_chip))
 108                         return -EINVAL;
 109                 if (!capable(CAP_SYS_ADMIN))
 110                         return -EPERM;
 111                 if (cmd == VIDIOC_DBG_G_REGISTER)
 112                         reg->val = cs5345_read(client, reg->reg & 0x1f);
 113                 else
 114                         cs5345_write(client, reg->reg & 0x1f, reg->val & 0x1f);
 115                 break;
 116         }
 117 #endif
 118
 119         case VIDIOC_G_CHIP_IDENT:
 120                 return v4l2_chip_ident_i2c_client(client,
 121                                 arg, V4L2_IDENT_CS5345, 0);
 122
 123         case VIDIOC_LOG_STATUS:
 124                 {
 125                         u8 v = cs5345_read(client, 0x09) & 7;
 126                         u8 m = cs5345_read(client, 0x04);
 127                         int vol = cs5345_read(client, 0x08) & 0x3f;
 128
 129                         v4l_info(client, "Input:  %d%s\n", v,
 130                                       (m & 0x80) ? " (muted)" : "");
 131                         if (vol >= 32)
 132                                 vol = vol - 64;
 133                         v4l_info(client, "Volume: %d dB\n", vol);
 134                         break;
 135                 }
 136
 137         default:
 138                 return -EINVAL;
 139         }
 140         return 0;
 141 }
 142
 143 /* ----------------------------------------------------------------------- */
 144
 145 static int cs5345_probe(struct i2c_client *client,
 146                         const struct i2c_device_id *id)
 147 {
 148         /* Check if the adapter supports the needed features */
 149         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 150                 return -EIO;
 151
 152         v4l_info(client, "chip found @ 0x%x (%s)\n",
 153                         client->addr << 1, client->adapter->name);
 154
 155         cs5345_write(client, 0x02, 0x00);
 156         cs5345_write(client, 0x04, 0x01);
 157         cs5345_write(client, 0x09, 0x01);
 158         return 0;
 159 }
 160
 161 /* ----------------------------------------------------------------------- */
 162
 163 static const struct i2c_device_id cs5345_id[] = {
 164         { "cs5345", 0 },
 165         { }
 166 };
 167 MODULE_DEVICE_TABLE(i2c, cs5345_id);
 168
 169 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 170         .name = "cs5345",
 171         .driverid = I2C_DRIVERID_CS5345,
 172         .command = cs5345_command,
 173         .probe = cs5345_probe,
 174         .id_table = cs5345_id,
 175 };