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
  16
  17 #include <linux/module.h>
  18 #include <linux/kernel.h>
  19 #include <linux/i2c.h>
  20 #include <linux/videodev2.h>
  21 #include <linux/slab.h>
  22 #include <media/v4l2-device.h>
  23 #include <media/v4l2-ctrls.h>
  24
  25 MODULE_DESCRIPTION("i2c device driver for cs5345 Audio ADC");
  26 MODULE_AUTHOR("Hans Verkuil");
  27 MODULE_LICENSE("GPL");
  28
  29 static bool debug;
  30
  31 module_param(debug, bool, 0644);
  32
  33 MODULE_PARM_DESC(debug, "Debugging messages, 0=Off (default), 1=On");
  34
  35 struct cs5345_state {
  36         struct v4l2_subdev sd;
  37         struct v4l2_ctrl_handler hdl;
  38 };
  39
  40 static inline struct cs5345_state *to_state(struct v4l2_subdev *sd)
  41 {
  42         return container_of(sd, struct cs5345_state, sd);
  43 }
  44
  45 static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
  46 {
  47         return &container_of(ctrl->handler, struct cs5345_state, hdl)->sd;
  48 }
  49
  50 /* ----------------------------------------------------------------------- */
  51
  52 static inline int cs5345_write(struct v4l2_subdev *sd, u8 reg, u8 value)
  53 {
  54         struct i2c_client *client = v4l2_get_subdevdata(sd);
  55
  56         return i2c_smbus_write_byte_data(client, reg, value);
  57 }
  58
  59 static inline int cs5345_read(struct v4l2_subdev *sd, u8 reg)
  60 {
  61         struct i2c_client *client = v4l2_get_subdevdata(sd);
  62
  63         return i2c_smbus_read_byte_data(client, reg);
  64 }
  65
  66 static int cs5345_s_routing(struct v4l2_subdev *sd,
  67                             u32 input, u32 output, u32 config)
  68 {
  69         if ((input & 0xf) > 6) {
  70                 v4l2_err(sd, "Invalid input %d.\n", input);
  71                 return -EINVAL;
  72         }
  73         cs5345_write(sd, 0x09, input & 0xf);
  74         cs5345_write(sd, 0x05, input & 0xf0);
  75         return 0;
  76 }
  77
  78 static int cs5345_s_ctrl(struct v4l2_ctrl *ctrl)
  79 {
  80         struct v4l2_subdev *sd = to_sd(ctrl);
  81
  82         switch (ctrl->id) {
  83         case V4L2_CID_AUDIO_MUTE:
  84                 cs5345_write(sd, 0x04, ctrl->val ? 0x80 : 0);
  85                 return 0;
  86         case V4L2_CID_AUDIO_VOLUME:
  87                 cs5345_write(sd, 0x07, ((u8)ctrl->val) & 0x3f);
  88                 cs5345_write(sd, 0x08, ((u8)ctrl->val) & 0x3f);
  89                 return 0;
  90         }
  91         return -EINVAL;
  92 }
  93
  94 #ifdef CONFIG_VIDEO_ADV_DEBUG
  95 static int cs5345_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
  96 {
  97         reg->size = 1;
  98         reg->val = cs5345_read(sd, reg->reg & 0x1f);
  99         return 0;
 100 }
 101
 102 static int cs5345_s_register(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg)
 103 {
 104         cs5345_write(sd, reg->reg & 0x1f, reg->val & 0xff);
 105         return 0;
 106 }
 107 #endif
 108
 109 static int cs5345_log_status(struct v4l2_subdev *sd)
 110 {
 111         u8 v = cs5345_read(sd, 0x09) & 7;
 112         u8 m = cs5345_read(sd, 0x04);
 113         int vol = cs5345_read(sd, 0x08) & 0x3f;
 114
 115         v4l2_info(sd, "Input:  %d%s\n", v,
 116                         (m & 0x80) ? " (muted)" : "");
 117         if (vol >= 32)
 118                 vol = vol - 64;
 119         v4l2_info(sd, "Volume: %d dB\n", vol);
 120         return 0;
 121 }
 122
 123 /* ----------------------------------------------------------------------- */
 124
 125 static const struct v4l2_ctrl_ops cs5345_ctrl_ops = {
 126         .s_ctrl = cs5345_s_ctrl,
 127 };
 128
 129 static const struct v4l2_subdev_core_ops cs5345_core_ops = {
 130         .log_status = cs5345_log_status,
 131 #ifdef CONFIG_VIDEO_ADV_DEBUG
 132         .g_register = cs5345_g_register,
 133         .s_register = cs5345_s_register,
 134 #endif
 135 };
 136
 137 static const struct v4l2_subdev_audio_ops cs5345_audio_ops = {
 138         .s_routing = cs5345_s_routing,
 139 };
 140
 141 static const struct v4l2_subdev_ops cs5345_ops = {
 142         .core = &cs5345_core_ops,
 143         .audio = &cs5345_audio_ops,
 144 };
 145
 146 /* ----------------------------------------------------------------------- */
 147
 148 static int cs5345_probe(struct i2c_client *client,
 149                         const struct i2c_device_id *id)
 150 {
 151         struct cs5345_state *state;
 152         struct v4l2_subdev *sd;
 153
 154         /* Check if the adapter supports the needed features */
 155         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 156                 return -EIO;
 157
 158         v4l_info(client, "chip found @ 0x%x (%s)\n",
 159                         client->addr << 1, client->adapter->name);
 160
 161         state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
 162         if (state == NULL)
 163                 return -ENOMEM;
 164         sd = &state->sd;
 165         v4l2_i2c_subdev_init(sd, client, &cs5345_ops);
 166
 167         v4l2_ctrl_handler_init(&state->hdl, 2);
 168         v4l2_ctrl_new_std(&state->hdl, &cs5345_ctrl_ops,
 169                         V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);
 170         v4l2_ctrl_new_std(&state->hdl, &cs5345_ctrl_ops,
 171                         V4L2_CID_AUDIO_VOLUME, -24, 24, 1, 0);
 172         sd->ctrl_handler = &state->hdl;
 173         if (state->hdl.error) {
 174                 int err = state->hdl.error;
 175
 176                 v4l2_ctrl_handler_free(&state->hdl);
 177                 return err;
 178         }
 179         /* set volume/mute */
 180         v4l2_ctrl_handler_setup(&state->hdl);
 181
 182         cs5345_write(sd, 0x02, 0x00);
 183         cs5345_write(sd, 0x04, 0x01);
 184         cs5345_write(sd, 0x09, 0x01);
 185         return 0;
 186 }
 187
 188 /* ----------------------------------------------------------------------- */
 189
 190 static int cs5345_remove(struct i2c_client *client)
 191 {
 192         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 193         struct cs5345_state *state = to_state(sd);
 194
 195         v4l2_device_unregister_subdev(sd);
 196         v4l2_ctrl_handler_free(&state->hdl);
 197         return 0;
 198 }
 199
 200 /* ----------------------------------------------------------------------- */
 201
 202 static const struct i2c_device_id cs5345_id[] = {
 203         { "cs5345", 0 },
 204         { }
 205 };
 206 MODULE_DEVICE_TABLE(i2c, cs5345_id);
 207
 208 static struct i2c_driver cs5345_driver = {
 209         .driver = {
 210                 .name   = "cs5345",
 211         },
 212         .probe          = cs5345_probe,
 213         .remove         = cs5345_remove,
 214         .id_table       = cs5345_id,
 215 };
 216
 217 module_i2c_driver(cs5345_driver);