drivers/media/i2c/tlv320aic23b.c

   1 /*
   2  * tlv320aic23b - driver version 0.0.1
   3  *
   4  * Copyright (C) 2006 Scott Alfter <salfter@ssai.us>
   5  *
   6  * Based on wm8775 driver
   7  *
   8  * Copyright (C) 2004 Ulf Eklund <ivtv at eklund.to>
   9  * Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/types.h>
  28 #include <linux/slab.h>
  29 #include <linux/ioctl.h>
  30 #include <asm/uaccess.h>
  31 #include <linux/i2c.h>
  32 #include <linux/videodev2.h>
  33 #include <media/v4l2-device.h>
  34 #include <media/v4l2-ctrls.h>
  35
  36 MODULE_DESCRIPTION("tlv320aic23b driver");
  37 MODULE_AUTHOR("Scott Alfter, Ulf Eklund, Hans Verkuil");
  38 MODULE_LICENSE("GPL");
  39
  40
  41 /* ----------------------------------------------------------------------- */
  42
  43 struct tlv320aic23b_state {
  44         struct v4l2_subdev sd;
  45         struct v4l2_ctrl_handler hdl;
  46 };
  47
  48 static inline struct tlv320aic23b_state *to_state(struct v4l2_subdev *sd)
  49 {
  50         return container_of(sd, struct tlv320aic23b_state, sd);
  51 }
  52
  53 static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
  54 {
  55         return &container_of(ctrl->handler, struct tlv320aic23b_state, hdl)->sd;
  56 }
  57
  58 static int tlv320aic23b_write(struct v4l2_subdev *sd, int reg, u16 val)
  59 {
  60         struct i2c_client *client = v4l2_get_subdevdata(sd);
  61         int i;
  62
  63         if ((reg < 0 || reg > 9) && (reg != 15)) {
  64                 v4l2_err(sd, "Invalid register R%d\n", reg);
  65                 return -1;
  66         }
  67
  68         for (i = 0; i < 3; i++)
  69                 if (i2c_smbus_write_byte_data(client,
  70                                 (reg << 1) | (val >> 8), val & 0xff) == 0)
  71                         return 0;
  72         v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
  73         return -1;
  74 }
  75
  76 static int tlv320aic23b_s_clock_freq(struct v4l2_subdev *sd, u32 freq)
  77 {
  78         switch (freq) {
  79         case 32000: /* set sample rate to 32 kHz */
  80                 tlv320aic23b_write(sd, 8, 0x018);
  81                 break;
  82         case 44100: /* set sample rate to 44.1 kHz */
  83                 tlv320aic23b_write(sd, 8, 0x022);
  84                 break;
  85         case 48000: /* set sample rate to 48 kHz */
  86                 tlv320aic23b_write(sd, 8, 0x000);
  87                 break;
  88         default:
  89                 return -EINVAL;
  90         }
  91         return 0;
  92 }
  93
  94 static int tlv320aic23b_s_ctrl(struct v4l2_ctrl *ctrl)
  95 {
  96         struct v4l2_subdev *sd = to_sd(ctrl);
  97
  98         switch (ctrl->id) {
  99         case V4L2_CID_AUDIO_MUTE:
 100                 tlv320aic23b_write(sd, 0, 0x180); /* mute both channels */
 101                 /* set gain on both channels to +3.0 dB */
 102                 if (!ctrl->val)
 103                         tlv320aic23b_write(sd, 0, 0x119);
 104                 return 0;
 105         }
 106         return -EINVAL;
 107 }
 108
 109 static int tlv320aic23b_log_status(struct v4l2_subdev *sd)
 110 {
 111         struct tlv320aic23b_state *state = to_state(sd);
 112
 113         v4l2_ctrl_handler_log_status(&state->hdl, sd->name);
 114         return 0;
 115 }
 116
 117 /* ----------------------------------------------------------------------- */
 118
 119 static const struct v4l2_ctrl_ops tlv320aic23b_ctrl_ops = {
 120         .s_ctrl = tlv320aic23b_s_ctrl,
 121 };
 122
 123 static const struct v4l2_subdev_core_ops tlv320aic23b_core_ops = {
 124         .log_status = tlv320aic23b_log_status,
 125 };
 126
 127 static const struct v4l2_subdev_audio_ops tlv320aic23b_audio_ops = {
 128         .s_clock_freq = tlv320aic23b_s_clock_freq,
 129 };
 130
 131 static const struct v4l2_subdev_ops tlv320aic23b_ops = {
 132         .core = &tlv320aic23b_core_ops,
 133         .audio = &tlv320aic23b_audio_ops,
 134 };
 135
 136 /* ----------------------------------------------------------------------- */
 137
 138 /* i2c implementation */
 139
 140 /*
 141  * Generic i2c probe
 142  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 143  */
 144
 145 static int tlv320aic23b_probe(struct i2c_client *client,
 146                               const struct i2c_device_id *id)
 147 {
 148         struct tlv320aic23b_state *state;
 149         struct v4l2_subdev *sd;
 150
 151         /* Check if the adapter supports the needed features */
 152         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 153                 return -EIO;
 154
 155         v4l_info(client, "chip found @ 0x%x (%s)\n",
 156                         client->addr << 1, client->adapter->name);
 157
 158         state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
 159         if (state == NULL)
 160                 return -ENOMEM;
 161         sd = &state->sd;
 162         v4l2_i2c_subdev_init(sd, client, &tlv320aic23b_ops);
 163
 164         /* Initialize tlv320aic23b */
 165
 166         /* RESET */
 167         tlv320aic23b_write(sd, 15, 0x000);
 168         /* turn off DAC & mic input */
 169         tlv320aic23b_write(sd, 6, 0x00A);
 170         /* left-justified, 24-bit, master mode */
 171         tlv320aic23b_write(sd, 7, 0x049);
 172         /* set gain on both channels to +3.0 dB */
 173         tlv320aic23b_write(sd, 0, 0x119);
 174         /* set sample rate to 48 kHz */
 175         tlv320aic23b_write(sd, 8, 0x000);
 176         /* activate digital interface */
 177         tlv320aic23b_write(sd, 9, 0x001);
 178
 179         v4l2_ctrl_handler_init(&state->hdl, 1);
 180         v4l2_ctrl_new_std(&state->hdl, &tlv320aic23b_ctrl_ops,
 181                         V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);
 182         sd->ctrl_handler = &state->hdl;
 183         if (state->hdl.error) {
 184                 int err = state->hdl.error;
 185
 186                 v4l2_ctrl_handler_free(&state->hdl);
 187                 return err;
 188         }
 189         v4l2_ctrl_handler_setup(&state->hdl);
 190         return 0;
 191 }
 192
 193 static int tlv320aic23b_remove(struct i2c_client *client)
 194 {
 195         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 196         struct tlv320aic23b_state *state = to_state(sd);
 197
 198         v4l2_device_unregister_subdev(sd);
 199         v4l2_ctrl_handler_free(&state->hdl);
 200         return 0;
 201 }
 202
 203 /* ----------------------------------------------------------------------- */
 204
 205 static const struct i2c_device_id tlv320aic23b_id[] = {
 206         { "tlv320aic23b", 0 },
 207         { }
 208 };
 209 MODULE_DEVICE_TABLE(i2c, tlv320aic23b_id);
 210
 211 static struct i2c_driver tlv320aic23b_driver = {
 212         .driver = {
 213                 .name   = "tlv320aic23b",
 214         },
 215         .probe          = tlv320aic23b_probe,
 216         .remove         = tlv320aic23b_remove,
 217         .id_table       = tlv320aic23b_id,
 218 };
 219
 220 module_i2c_driver(tlv320aic23b_driver);