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-device.h>
  27 #include <media/v4l2-chip-ident.h>
  28 #include <media/v4l2-i2c-drv.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, 0=Off (default), 1=On");
  39
  40
  41 /* ----------------------------------------------------------------------- */
  42
  43 static inline int cs5345_write(struct v4l2_subdev *sd, u8 reg, u8 value)
  44 {
  45         struct i2c_client *client = v4l2_get_subdevdata(sd);
  46
  47         return i2c_smbus_write_byte_data(client, reg, value);
  48 }
  49
  50 static inline int cs5345_read(struct v4l2_subdev *sd, u8 reg)
  51 {
  52         struct i2c_client *client = v4l2_get_subdevdata(sd);
  53
  54         return i2c_smbus_read_byte_data(client, reg);
  55 }
  56
  57 static int cs5345_s_routing(struct v4l2_subdev *sd, const struct v4l2_routing *route)
  58 {
  59         if ((route->input & 0xf) > 6) {
  60                 v4l2_err(sd, "Invalid input %d.\n", route->input);
  61                 return -EINVAL;
  62         }
  63         cs5345_write(sd, 0x09, route->input & 0xf);
  64         cs5345_write(sd, 0x05, route->input & 0xf0);
  65         return 0;
  66 }
  67
  68 static int cs5345_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
  69 {
  70         if (ctrl->id == V4L2_CID_AUDIO_MUTE) {
  71                 ctrl->value = (cs5345_read(sd, 0x04) & 0x08) != 0;
  72                 return 0;
  73         }
  74         if (ctrl->id != V4L2_CID_AUDIO_VOLUME)
  75                 return -EINVAL;
  76         ctrl->value = cs5345_read(sd, 0x07) & 0x3f;
  77         if (ctrl->value >= 32)
  78                 ctrl->value = ctrl->value - 64;
  79         return 0;
  80 }
  81
  82 static int cs5345_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
  83 {
  84         if (ctrl->id == V4L2_CID_AUDIO_MUTE) {
  85                 cs5345_write(sd, 0x04, ctrl->value ? 0x80 : 0);
  86                 return 0;
  87         }
  88         if (ctrl->id != V4L2_CID_AUDIO_VOLUME)
  89                 return -EINVAL;
  90         if (ctrl->value > 24 || ctrl->value < -24)
  91                 return -EINVAL;
  92         cs5345_write(sd, 0x07, ((u8)ctrl->value) & 0x3f);
  93         cs5345_write(sd, 0x08, ((u8)ctrl->value) & 0x3f);
  94         return 0;
  95 }
  96
  97 #ifdef CONFIG_VIDEO_ADV_DEBUG
  98 static int cs5345_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
  99 {
 100         struct i2c_client *client = v4l2_get_subdevdata(sd);
 101
 102         if (!v4l2_chip_match_i2c_client(client, &reg->match))
 103                 return -EINVAL;
 104         if (!capable(CAP_SYS_ADMIN))
 105                 return -EPERM;
 106         reg->size = 1;
 107         reg->val = cs5345_read(sd, reg->reg & 0x1f);
 108         return 0;
 109 }
 110
 111 static int cs5345_s_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
 112 {
 113         struct i2c_client *client = v4l2_get_subdevdata(sd);
 114
 115         if (!v4l2_chip_match_i2c_client(client, &reg->match))
 116                 return -EINVAL;
 117         if (!capable(CAP_SYS_ADMIN))
 118                 return -EPERM;
 119         cs5345_write(sd, reg->reg & 0x1f, reg->val & 0xff);
 120         return 0;
 121 }
 122 #endif
 123
 124 static int cs5345_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
 125 {
 126         struct i2c_client *client = v4l2_get_subdevdata(sd);
 127
 128         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_CS5345, 0);
 129 }
 130
 131 static int cs5345_log_status(struct v4l2_subdev *sd)
 132 {
 133         u8 v = cs5345_read(sd, 0x09) & 7;
 134         u8 m = cs5345_read(sd, 0x04);
 135         int vol = cs5345_read(sd, 0x08) & 0x3f;
 136
 137         v4l2_info(sd, "Input:  %d%s\n", v,
 138                         (m & 0x80) ? " (muted)" : "");
 139         if (vol >= 32)
 140                 vol = vol - 64;
 141         v4l2_info(sd, "Volume: %d dB\n", vol);
 142         return 0;
 143 }
 144
 145 static int cs5345_command(struct i2c_client *client, unsigned cmd, void *arg)
 146 {
 147         return v4l2_subdev_command(i2c_get_clientdata(client), cmd, arg);
 148 }
 149
 150 /* ----------------------------------------------------------------------- */
 151
 152 static const struct v4l2_subdev_core_ops cs5345_core_ops = {
 153         .log_status = cs5345_log_status,
 154         .g_chip_ident = cs5345_g_chip_ident,
 155         .g_ctrl = cs5345_g_ctrl,
 156         .s_ctrl = cs5345_s_ctrl,
 157 #ifdef CONFIG_VIDEO_ADV_DEBUG
 158         .g_register = cs5345_g_register,
 159         .s_register = cs5345_s_register,
 160 #endif
 161 };
 162
 163 static const struct v4l2_subdev_audio_ops cs5345_audio_ops = {
 164         .s_routing = cs5345_s_routing,
 165 };
 166
 167 static const struct v4l2_subdev_ops cs5345_ops = {
 168         .core = &cs5345_core_ops,
 169         .audio = &cs5345_audio_ops,
 170 };
 171
 172 /* ----------------------------------------------------------------------- */
 173
 174 static int cs5345_probe(struct i2c_client *client,
 175                         const struct i2c_device_id *id)
 176 {
 177         struct v4l2_subdev *sd;
 178
 179         /* Check if the adapter supports the needed features */
 180         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 181                 return -EIO;
 182
 183         v4l_info(client, "chip found @ 0x%x (%s)\n",
 184                         client->addr << 1, client->adapter->name);
 185
 186         sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
 187         if (sd == NULL)
 188                 return -ENOMEM;
 189         v4l2_i2c_subdev_init(sd, client, &cs5345_ops);
 190
 191         cs5345_write(sd, 0x02, 0x00);
 192         cs5345_write(sd, 0x04, 0x01);
 193         cs5345_write(sd, 0x09, 0x01);
 194         return 0;
 195 }
 196
 197 /* ----------------------------------------------------------------------- */
 198
 199 static int cs5345_remove(struct i2c_client *client)
 200 {
 201         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 202
 203         v4l2_device_unregister_subdev(sd);
 204         kfree(sd);
 205         return 0;
 206 }
 207
 208 /* ----------------------------------------------------------------------- */
 209
 210 static const struct i2c_device_id cs5345_id[] = {
 211         { "cs5345", 0 },
 212         { }
 213 };
 214 MODULE_DEVICE_TABLE(i2c, cs5345_id);
 215
 216 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 217         .name = "cs5345",
 218         .driverid = I2C_DRIVERID_CS5345,
 219         .command = cs5345_command,
 220         .probe = cs5345_probe,
 221         .remove = cs5345_remove,
 222         .id_table = cs5345_id,
 223 };