drivers/media/i2c/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-ctrls.h>
  28
  29 MODULE_DESCRIPTION("i2c device driver for cs5345 Audio ADC");
  30 MODULE_AUTHOR("Hans Verkuil");
  31 MODULE_LICENSE("GPL");
  32
  33 static bool debug;
  34
  35 module_param(debug, bool, 0644);
  36
  37 MODULE_PARM_DESC(debug, "Debugging messages, 0=Off (default), 1=On");
  38
  39 struct cs5345_state {
  40         struct v4l2_subdev sd;
  41         struct v4l2_ctrl_handler hdl;
  42 };
  43
  44 static inline struct cs5345_state *to_state(struct v4l2_subdev *sd)
  45 {
  46         return container_of(sd, struct cs5345_state, sd);
  47 }
  48
  49 static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
  50 {
  51         return &container_of(ctrl->handler, struct cs5345_state, hdl)->sd;
  52 }
  53
  54 /* ----------------------------------------------------------------------- */
  55
  56 static inline int cs5345_write(struct v4l2_subdev *sd, u8 reg, u8 value)
  57 {
  58         struct i2c_client *client = v4l2_get_subdevdata(sd);
  59
  60         return i2c_smbus_write_byte_data(client, reg, value);
  61 }
  62
  63 static inline int cs5345_read(struct v4l2_subdev *sd, u8 reg)
  64 {
  65         struct i2c_client *client = v4l2_get_subdevdata(sd);
  66
  67         return i2c_smbus_read_byte_data(client, reg);
  68 }
  69
  70 static int cs5345_s_routing(struct v4l2_subdev *sd,
  71                             u32 input, u32 output, u32 config)
  72 {
  73         if ((input & 0xf) > 6) {
  74                 v4l2_err(sd, "Invalid input %d.\n", input);
  75                 return -EINVAL;
  76         }
  77         cs5345_write(sd, 0x09, input & 0xf);
  78         cs5345_write(sd, 0x05, input & 0xf0);
  79         return 0;
  80 }
  81
  82 static int cs5345_s_ctrl(struct v4l2_ctrl *ctrl)
  83 {
  84         struct v4l2_subdev *sd = to_sd(ctrl);
  85
  86         switch (ctrl->id) {
  87         case V4L2_CID_AUDIO_MUTE:
  88                 cs5345_write(sd, 0x04, ctrl->val ? 0x80 : 0);
  89                 return 0;
  90         case V4L2_CID_AUDIO_VOLUME:
  91                 cs5345_write(sd, 0x07, ((u8)ctrl->val) & 0x3f);
  92                 cs5345_write(sd, 0x08, ((u8)ctrl->val) & 0x3f);
  93                 return 0;
  94         }
  95         return -EINVAL;
  96 }
  97
  98 #ifdef CONFIG_VIDEO_ADV_DEBUG
  99 static int cs5345_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
 100 {
 101         reg->size = 1;
 102         reg->val = cs5345_read(sd, reg->reg & 0x1f);
 103         return 0;
 104 }
 105
 106 static int cs5345_s_register(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg)
 107 {
 108         cs5345_write(sd, reg->reg & 0x1f, reg->val & 0xff);
 109         return 0;
 110 }
 111 #endif
 112
 113 static int cs5345_log_status(struct v4l2_subdev *sd)
 114 {
 115         u8 v = cs5345_read(sd, 0x09) & 7;
 116         u8 m = cs5345_read(sd, 0x04);
 117         int vol = cs5345_read(sd, 0x08) & 0x3f;
 118
 119         v4l2_info(sd, "Input:  %d%s\n", v,
 120                         (m & 0x80) ? " (muted)" : "");
 121         if (vol >= 32)
 122                 vol = vol - 64;
 123         v4l2_info(sd, "Volume: %d dB\n", vol);
 124         return 0;
 125 }
 126
 127 /* ----------------------------------------------------------------------- */
 128
 129 static const struct v4l2_ctrl_ops cs5345_ctrl_ops = {
 130         .s_ctrl = cs5345_s_ctrl,
 131 };
 132
 133 static const struct v4l2_subdev_core_ops cs5345_core_ops = {
 134         .log_status = cs5345_log_status,
 135 #ifdef CONFIG_VIDEO_ADV_DEBUG
 136         .g_register = cs5345_g_register,
 137         .s_register = cs5345_s_register,
 138 #endif
 139 };
 140
 141 static const struct v4l2_subdev_audio_ops cs5345_audio_ops = {
 142         .s_routing = cs5345_s_routing,
 143 };
 144
 145 static const struct v4l2_subdev_ops cs5345_ops = {
 146         .core = &cs5345_core_ops,
 147         .audio = &cs5345_audio_ops,
 148 };
 149
 150 /* ----------------------------------------------------------------------- */
 151
 152 static int cs5345_probe(struct i2c_client *client,
 153                         const struct i2c_device_id *id)
 154 {
 155         struct cs5345_state *state;
 156         struct v4l2_subdev *sd;
 157
 158         /* Check if the adapter supports the needed features */
 159         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 160                 return -EIO;
 161
 162         v4l_info(client, "chip found @ 0x%x (%s)\n",
 163                         client->addr << 1, client->adapter->name);
 164
 165         state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
 166         if (state == NULL)
 167                 return -ENOMEM;
 168         sd = &state->sd;
 169         v4l2_i2c_subdev_init(sd, client, &cs5345_ops);
 170
 171         v4l2_ctrl_handler_init(&state->hdl, 2);
 172         v4l2_ctrl_new_std(&state->hdl, &cs5345_ctrl_ops,
 173                         V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);
 174         v4l2_ctrl_new_std(&state->hdl, &cs5345_ctrl_ops,
 175                         V4L2_CID_AUDIO_VOLUME, -24, 24, 1, 0);
 176         sd->ctrl_handler = &state->hdl;
 177         if (state->hdl.error) {
 178                 int err = state->hdl.error;
 179
 180                 v4l2_ctrl_handler_free(&state->hdl);
 181                 return err;
 182         }
 183         /* set volume/mute */
 184         v4l2_ctrl_handler_setup(&state->hdl);
 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         struct cs5345_state *state = to_state(sd);
 198
 199         v4l2_device_unregister_subdev(sd);
 200         v4l2_ctrl_handler_free(&state->hdl);
 201         return 0;
 202 }
 203
 204 /* ----------------------------------------------------------------------- */
 205
 206 static const struct i2c_device_id cs5345_id[] = {
 207         { "cs5345", 0 },
 208         { }
 209 };
 210 MODULE_DEVICE_TABLE(i2c, cs5345_id);
 211
 212 static struct i2c_driver cs5345_driver = {
 213         .driver = {
 214                 .name   = "cs5345",
 215         },
 216         .probe          = cs5345_probe,
 217         .remove         = cs5345_remove,
 218         .id_table       = cs5345_id,
 219 };
 220
 221 module_i2c_driver(cs5345_driver);