drivers/media/video/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
  35 MODULE_DESCRIPTION("tlv320aic23b driver");
  36 MODULE_AUTHOR("Scott Alfter, Ulf Eklund, Hans Verkuil");
  37 MODULE_LICENSE("GPL");
  38
  39
  40 /* ----------------------------------------------------------------------- */
  41
  42 struct tlv320aic23b_state {
  43         struct v4l2_subdev sd;
  44         u8 muted;
  45 };
  46
  47 static inline struct tlv320aic23b_state *to_state(struct v4l2_subdev *sd)
  48 {
  49         return container_of(sd, struct tlv320aic23b_state, sd);
  50 }
  51
  52 static int tlv320aic23b_write(struct v4l2_subdev *sd, int reg, u16 val)
  53 {
  54         struct i2c_client *client = v4l2_get_subdevdata(sd);
  55         int i;
  56
  57         if ((reg < 0 || reg > 9) && (reg != 15)) {
  58                 v4l2_err(sd, "Invalid register R%d\n", reg);
  59                 return -1;
  60         }
  61
  62         for (i = 0; i < 3; i++)
  63                 if (i2c_smbus_write_byte_data(client,
  64                                 (reg << 1) | (val >> 8), val & 0xff) == 0)
  65                         return 0;
  66         v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
  67         return -1;
  68 }
  69
  70 static int tlv320aic23b_s_clock_freq(struct v4l2_subdev *sd, u32 freq)
  71 {
  72         switch (freq) {
  73         case 32000: /* set sample rate to 32 kHz */
  74                 tlv320aic23b_write(sd, 8, 0x018);
  75                 break;
  76         case 44100: /* set sample rate to 44.1 kHz */
  77                 tlv320aic23b_write(sd, 8, 0x022);
  78                 break;
  79         case 48000: /* set sample rate to 48 kHz */
  80                 tlv320aic23b_write(sd, 8, 0x000);
  81                 break;
  82         default:
  83                 return -EINVAL;
  84         }
  85         return 0;
  86 }
  87
  88 static int tlv320aic23b_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
  89 {
  90         struct tlv320aic23b_state *state = to_state(sd);
  91
  92         if (ctrl->id != V4L2_CID_AUDIO_MUTE)
  93                 return -EINVAL;
  94         ctrl->value = state->muted;
  95         return 0;
  96 }
  97
  98 static int tlv320aic23b_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
  99 {
 100         struct tlv320aic23b_state *state = to_state(sd);
 101
 102         if (ctrl->id != V4L2_CID_AUDIO_MUTE)
 103                 return -EINVAL;
 104         state->muted = ctrl->value;
 105         tlv320aic23b_write(sd, 0, 0x180); /* mute both channels */
 106         /* set gain on both channels to +3.0 dB */
 107         if (!state->muted)
 108                 tlv320aic23b_write(sd, 0, 0x119);
 109         return 0;
 110 }
 111
 112 static int tlv320aic23b_log_status(struct v4l2_subdev *sd)
 113 {
 114         struct tlv320aic23b_state *state = to_state(sd);
 115
 116         v4l2_info(sd, "Input: %s\n", state->muted ? "muted" : "active");
 117         return 0;
 118 }
 119
 120 /* ----------------------------------------------------------------------- */
 121
 122 static const struct v4l2_subdev_core_ops tlv320aic23b_core_ops = {
 123         .log_status = tlv320aic23b_log_status,
 124         .g_ctrl = tlv320aic23b_g_ctrl,
 125         .s_ctrl = tlv320aic23b_s_ctrl,
 126 };
 127
 128 static const struct v4l2_subdev_audio_ops tlv320aic23b_audio_ops = {
 129         .s_clock_freq = tlv320aic23b_s_clock_freq,
 130 };
 131
 132 static const struct v4l2_subdev_ops tlv320aic23b_ops = {
 133         .core = &tlv320aic23b_core_ops,
 134         .audio = &tlv320aic23b_audio_ops,
 135 };
 136
 137 /* ----------------------------------------------------------------------- */
 138
 139 /* i2c implementation */
 140
 141 /*
 142  * Generic i2c probe
 143  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 144  */
 145
 146 static int tlv320aic23b_probe(struct i2c_client *client,
 147                               const struct i2c_device_id *id)
 148 {
 149         struct tlv320aic23b_state *state;
 150         struct v4l2_subdev *sd;
 151
 152         /* Check if the adapter supports the needed features */
 153         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 154                 return -EIO;
 155
 156         v4l_info(client, "chip found @ 0x%x (%s)\n",
 157                         client->addr << 1, client->adapter->name);
 158
 159         state = kzalloc(sizeof(struct tlv320aic23b_state), GFP_KERNEL);
 160         if (state == NULL)
 161                 return -ENOMEM;
 162         sd = &state->sd;
 163         v4l2_i2c_subdev_init(sd, client, &tlv320aic23b_ops);
 164         state->muted = 0;
 165
 166         /* Initialize tlv320aic23b */
 167
 168         /* RESET */
 169         tlv320aic23b_write(sd, 15, 0x000);
 170         /* turn off DAC & mic input */
 171         tlv320aic23b_write(sd, 6, 0x00A);
 172         /* left-justified, 24-bit, master mode */
 173         tlv320aic23b_write(sd, 7, 0x049);
 174         /* set gain on both channels to +3.0 dB */
 175         tlv320aic23b_write(sd, 0, 0x119);
 176         /* set sample rate to 48 kHz */
 177         tlv320aic23b_write(sd, 8, 0x000);
 178         /* activate digital interface */
 179         tlv320aic23b_write(sd, 9, 0x001);
 180         return 0;
 181 }
 182
 183 static int tlv320aic23b_remove(struct i2c_client *client)
 184 {
 185         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 186
 187         v4l2_device_unregister_subdev(sd);
 188         kfree(to_state(sd));
 189         return 0;
 190 }
 191
 192 /* ----------------------------------------------------------------------- */
 193
 194 static const struct i2c_device_id tlv320aic23b_id[] = {
 195         { "tlv320aic23b", 0 },
 196         { }
 197 };
 198 MODULE_DEVICE_TABLE(i2c, tlv320aic23b_id);
 199
 200 static struct i2c_driver tlv320aic23b_driver = {
 201         .driver = {
 202                 .owner  = THIS_MODULE,
 203                 .name   = "tlv320aic23b",
 204         },
 205         .probe          = tlv320aic23b_probe,
 206         .remove         = tlv320aic23b_remove,
 207         .id_table       = tlv320aic23b_id,
 208 };
 209
 210 static __init int init_tlv320aic23b(void)
 211 {
 212         return i2c_add_driver(&tlv320aic23b_driver);
 213 }
 214
 215 static __exit void exit_tlv320aic23b(void)
 216 {
 217         i2c_del_driver(&tlv320aic23b_driver);
 218 }
 219
 220 module_init(init_tlv320aic23b);
 221 module_exit(exit_tlv320aic23b);