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/module.h>
  22 #include <linux/kernel.h>
  23 #include <linux/i2c.h>
  24 #include <linux/videodev2.h>
  25 #include <media/v4l2-device.h>
  26 #include <media/v4l2-chip-ident.h>
  27 #include <media/v4l2-i2c-drv.h>
  28
  29 MODULE_DESCRIPTION("i2c device driver for cs5345 Audio ADC");
  30 MODULE_AUTHOR("Hans Verkuil");
  31 MODULE_LICENSE("GPL");
  32
  33 static int debug;
  34
  35 module_param(debug, bool, 0644);
  36
  37 MODULE_PARM_DESC(debug, "Debugging messages, 0=Off (default), 1=On");
  38
  39
  40 /* ----------------------------------------------------------------------- */
  41
  42 static inline int cs5345_write(struct v4l2_subdev *sd, u8 reg, u8 value)
  43 {
  44         struct i2c_client *client = v4l2_get_subdevdata(sd);
  45
  46         return i2c_smbus_write_byte_data(client, reg, value);
  47 }
  48
  49 static inline int cs5345_read(struct v4l2_subdev *sd, u8 reg)
  50 {
  51         struct i2c_client *client = v4l2_get_subdevdata(sd);
  52
  53         return i2c_smbus_read_byte_data(client, reg);
  54 }
  55
  56 static int cs5345_s_routing(struct v4l2_subdev *sd, const struct v4l2_routing *route)
  57 {
  58         if ((route->input & 0xf) > 6) {
  59                 v4l2_err(sd, "Invalid input %d.\n", route->input);
  60                 return -EINVAL;
  61         }
  62         cs5345_write(sd, 0x09, route->input & 0xf);
  63         cs5345_write(sd, 0x05, route->input & 0xf0);
  64         return 0;
  65 }
  66
  67 static int cs5345_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
  68 {
  69         if (ctrl->id == V4L2_CID_AUDIO_MUTE) {
  70                 ctrl->value = (cs5345_read(sd, 0x04) & 0x08) != 0;
  71                 return 0;
  72         }
  73         if (ctrl->id != V4L2_CID_AUDIO_VOLUME)
  74                 return -EINVAL;
  75         ctrl->value = cs5345_read(sd, 0x07) & 0x3f;
  76         if (ctrl->value >= 32)
  77                 ctrl->value = ctrl->value - 64;
  78         return 0;
  79 }
  80
  81 static int cs5345_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
  82 {
  83         if (ctrl->id == V4L2_CID_AUDIO_MUTE) {
  84                 cs5345_write(sd, 0x04, ctrl->value ? 0x80 : 0);
  85                 return 0;
  86         }
  87         if (ctrl->id != V4L2_CID_AUDIO_VOLUME)
  88                 return -EINVAL;
  89         if (ctrl->value > 24 || ctrl->value < -24)
  90                 return -EINVAL;
  91         cs5345_write(sd, 0x07, ((u8)ctrl->value) & 0x3f);
  92         cs5345_write(sd, 0x08, ((u8)ctrl->value) & 0x3f);
  93         return 0;
  94 }
  95
  96 #ifdef CONFIG_VIDEO_ADV_DEBUG
  97 static int cs5345_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
  98 {
  99         struct i2c_client *client = v4l2_get_subdevdata(sd);
 100
 101         if (!v4l2_chip_match_i2c_client(client, &reg->match))
 102                 return -EINVAL;
 103         if (!capable(CAP_SYS_ADMIN))
 104                 return -EPERM;
 105         reg->size = 1;
 106         reg->val = cs5345_read(sd, reg->reg & 0x1f);
 107         return 0;
 108 }
 109
 110 static int cs5345_s_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
 111 {
 112         struct i2c_client *client = v4l2_get_subdevdata(sd);
 113
 114         if (!v4l2_chip_match_i2c_client(client, &reg->match))
 115                 return -EINVAL;
 116         if (!capable(CAP_SYS_ADMIN))
 117                 return -EPERM;
 118         cs5345_write(sd, reg->reg & 0x1f, reg->val & 0xff);
 119         return 0;
 120 }
 121 #endif
 122
 123 static int cs5345_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
 124 {
 125         struct i2c_client *client = v4l2_get_subdevdata(sd);
 126
 127         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_CS5345, 0);
 128 }
 129
 130 static int cs5345_log_status(struct v4l2_subdev *sd)
 131 {
 132         u8 v = cs5345_read(sd, 0x09) & 7;
 133         u8 m = cs5345_read(sd, 0x04);
 134         int vol = cs5345_read(sd, 0x08) & 0x3f;
 135
 136         v4l2_info(sd, "Input:  %d%s\n", v,
 137                         (m & 0x80) ? " (muted)" : "");
 138         if (vol >= 32)
 139                 vol = vol - 64;
 140         v4l2_info(sd, "Volume: %d dB\n", vol);
 141         return 0;
 142 }
 143
 144 /* ----------------------------------------------------------------------- */
 145
 146 static const struct v4l2_subdev_core_ops cs5345_core_ops = {
 147         .log_status = cs5345_log_status,
 148         .g_chip_ident = cs5345_g_chip_ident,
 149         .g_ctrl = cs5345_g_ctrl,
 150         .s_ctrl = cs5345_s_ctrl,
 151 #ifdef CONFIG_VIDEO_ADV_DEBUG
 152         .g_register = cs5345_g_register,
 153         .s_register = cs5345_s_register,
 154 #endif
 155 };
 156
 157 static const struct v4l2_subdev_audio_ops cs5345_audio_ops = {
 158         .s_routing = cs5345_s_routing,
 159 };
 160
 161 static const struct v4l2_subdev_ops cs5345_ops = {
 162         .core = &cs5345_core_ops,
 163         .audio = &cs5345_audio_ops,
 164 };
 165
 166 /* ----------------------------------------------------------------------- */
 167
 168 static int cs5345_probe(struct i2c_client *client,
 169                         const struct i2c_device_id *id)
 170 {
 171         struct v4l2_subdev *sd;
 172
 173         /* Check if the adapter supports the needed features */
 174         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 175                 return -EIO;
 176
 177         v4l_info(client, "chip found @ 0x%x (%s)\n",
 178                         client->addr << 1, client->adapter->name);
 179
 180         sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
 181         if (sd == NULL)
 182                 return -ENOMEM;
 183         v4l2_i2c_subdev_init(sd, client, &cs5345_ops);
 184
 185         cs5345_write(sd, 0x02, 0x00);
 186         cs5345_write(sd, 0x04, 0x01);
 187         cs5345_write(sd, 0x09, 0x01);
 188         return 0;
 189 }
 190
 191 /* ----------------------------------------------------------------------- */
 192
 193 static int cs5345_remove(struct i2c_client *client)
 194 {
 195         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 196
 197         v4l2_device_unregister_subdev(sd);
 198         kfree(sd);
 199         return 0;
 200 }
 201
 202 /* ----------------------------------------------------------------------- */
 203
 204 static const struct i2c_device_id cs5345_id[] = {
 205         { "cs5345", 0 },
 206         { }
 207 };
 208 MODULE_DEVICE_TABLE(i2c, cs5345_id);
 209
 210 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 211         .name = "cs5345",
 212         .probe = cs5345_probe,
 213         .remove = cs5345_remove,
 214         .id_table = cs5345_id,
 215 };