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 <linux/slab.h>
  26 #include <media/v4l2-device.h>
  27 #include <media/v4l2-chip-ident.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,
  57                             u32 input, u32 output, u32 config)
  58 {
  59         if ((input & 0xf) > 6) {
  60                 v4l2_err(sd, "Invalid input %d.\n", input);
  61                 return -EINVAL;
  62         }
  63         cs5345_write(sd, 0x09, input & 0xf);
  64         cs5345_write(sd, 0x05, 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 /* ----------------------------------------------------------------------- */
 146
 147 static const struct v4l2_subdev_core_ops cs5345_core_ops = {
 148         .log_status = cs5345_log_status,
 149         .g_chip_ident = cs5345_g_chip_ident,
 150         .g_ctrl = cs5345_g_ctrl,
 151         .s_ctrl = cs5345_s_ctrl,
 152 #ifdef CONFIG_VIDEO_ADV_DEBUG
 153         .g_register = cs5345_g_register,
 154         .s_register = cs5345_s_register,
 155 #endif
 156 };
 157
 158 static const struct v4l2_subdev_audio_ops cs5345_audio_ops = {
 159         .s_routing = cs5345_s_routing,
 160 };
 161
 162 static const struct v4l2_subdev_ops cs5345_ops = {
 163         .core = &cs5345_core_ops,
 164         .audio = &cs5345_audio_ops,
 165 };
 166
 167 /* ----------------------------------------------------------------------- */
 168
 169 static int cs5345_probe(struct i2c_client *client,
 170                         const struct i2c_device_id *id)
 171 {
 172         struct v4l2_subdev *sd;
 173
 174         /* Check if the adapter supports the needed features */
 175         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 176                 return -EIO;
 177
 178         v4l_info(client, "chip found @ 0x%x (%s)\n",
 179                         client->addr << 1, client->adapter->name);
 180
 181         sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
 182         if (sd == NULL)
 183                 return -ENOMEM;
 184         v4l2_i2c_subdev_init(sd, client, &cs5345_ops);
 185
 186         cs5345_write(sd, 0x02, 0x00);
 187         cs5345_write(sd, 0x04, 0x01);
 188         cs5345_write(sd, 0x09, 0x01);
 189         return 0;
 190 }
 191
 192 /* ----------------------------------------------------------------------- */
 193
 194 static int cs5345_remove(struct i2c_client *client)
 195 {
 196         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 197
 198         v4l2_device_unregister_subdev(sd);
 199         kfree(sd);
 200         return 0;
 201 }
 202
 203 /* ----------------------------------------------------------------------- */
 204
 205 static const struct i2c_device_id cs5345_id[] = {
 206         { "cs5345", 0 },
 207         { }
 208 };
 209 MODULE_DEVICE_TABLE(i2c, cs5345_id);
 210
 211 static struct i2c_driver cs5345_driver = {
 212         .driver = {
 213                 .owner  = THIS_MODULE,
 214                 .name   = "cs5345",
 215         },
 216         .probe          = cs5345_probe,
 217         .remove         = cs5345_remove,
 218         .id_table       = cs5345_id,
 219 };
 220
 221 static __init int init_cs5345(void)
 222 {
 223         return i2c_add_driver(&cs5345_driver);
 224 }
 225
 226 static __exit void exit_cs5345(void)
 227 {
 228         i2c_del_driver(&cs5345_driver);
 229 }
 230
 231 module_init(init_cs5345);
 232 module_exit(exit_cs5345);