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/ioctl.h>
  29 #include <asm/uaccess.h>
  30 #include <linux/i2c.h>
  31 #include <linux/i2c-id.h>
  32 #include <linux/videodev2.h>
  33 #include <media/v4l2-device.h>
  34 #include <media/v4l2-i2c-drv.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         u8 muted;
  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 int tlv320aic23b_write(struct v4l2_subdev *sd, int reg, u16 val)
  54 {
  55         struct i2c_client *client = v4l2_get_subdevdata(sd);
  56         int i;
  57
  58         if ((reg < 0 || reg > 9) && (reg != 15)) {
  59                 v4l2_err(sd, "Invalid register R%d\n", reg);
  60                 return -1;
  61         }
  62
  63         for (i = 0; i < 3; i++)
  64                 if (i2c_smbus_write_byte_data(client,
  65                                 (reg << 1) | (val >> 8), val & 0xff) == 0)
  66                         return 0;
  67         v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
  68         return -1;
  69 }
  70
  71 static int tlv320aic23b_s_clock_freq(struct v4l2_subdev *sd, u32 freq)
  72 {
  73         switch (freq) {
  74         case 32000: /* set sample rate to 32 kHz */
  75                 tlv320aic23b_write(sd, 8, 0x018);
  76                 break;
  77         case 44100: /* set sample rate to 44.1 kHz */
  78                 tlv320aic23b_write(sd, 8, 0x022);
  79                 break;
  80         case 48000: /* set sample rate to 48 kHz */
  81                 tlv320aic23b_write(sd, 8, 0x000);
  82                 break;
  83         default:
  84                 return -EINVAL;
  85         }
  86         return 0;
  87 }
  88
  89 static int tlv320aic23b_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
  90 {
  91         struct tlv320aic23b_state *state = to_state(sd);
  92
  93         if (ctrl->id != V4L2_CID_AUDIO_MUTE)
  94                 return -EINVAL;
  95         ctrl->value = state->muted;
  96         return 0;
  97 }
  98
  99 static int tlv320aic23b_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 100 {
 101         struct tlv320aic23b_state *state = to_state(sd);
 102
 103         if (ctrl->id != V4L2_CID_AUDIO_MUTE)
 104                 return -EINVAL;
 105         state->muted = ctrl->value;
 106         tlv320aic23b_write(sd, 0, 0x180); /* mute both channels */
 107         /* set gain on both channels to +3.0 dB */
 108         if (!state->muted)
 109                 tlv320aic23b_write(sd, 0, 0x119);
 110         return 0;
 111 }
 112
 113 static int tlv320aic23b_log_status(struct v4l2_subdev *sd)
 114 {
 115         struct tlv320aic23b_state *state = to_state(sd);
 116
 117         v4l2_info(sd, "Input: %s\n", state->muted ? "muted" : "active");
 118         return 0;
 119 }
 120
 121 /* ----------------------------------------------------------------------- */
 122
 123 static const struct v4l2_subdev_core_ops tlv320aic23b_core_ops = {
 124         .log_status = tlv320aic23b_log_status,
 125         .g_ctrl = tlv320aic23b_g_ctrl,
 126         .s_ctrl = tlv320aic23b_s_ctrl,
 127 };
 128
 129 static const struct v4l2_subdev_audio_ops tlv320aic23b_audio_ops = {
 130         .s_clock_freq = tlv320aic23b_s_clock_freq,
 131 };
 132
 133 static const struct v4l2_subdev_ops tlv320aic23b_ops = {
 134         .core = &tlv320aic23b_core_ops,
 135         .audio = &tlv320aic23b_audio_ops,
 136 };
 137
 138 /* ----------------------------------------------------------------------- */
 139
 140 /* i2c implementation */
 141
 142 /*
 143  * Generic i2c probe
 144  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 145  */
 146
 147 static int tlv320aic23b_probe(struct i2c_client *client,
 148                               const struct i2c_device_id *id)
 149 {
 150         struct tlv320aic23b_state *state;
 151         struct v4l2_subdev *sd;
 152
 153         /* Check if the adapter supports the needed features */
 154         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 155                 return -EIO;
 156
 157         v4l_info(client, "chip found @ 0x%x (%s)\n",
 158                         client->addr << 1, client->adapter->name);
 159
 160         state = kzalloc(sizeof(struct tlv320aic23b_state), GFP_KERNEL);
 161         if (state == NULL)
 162                 return -ENOMEM;
 163         sd = &state->sd;
 164         v4l2_i2c_subdev_init(sd, client, &tlv320aic23b_ops);
 165         state->muted = 0;
 166
 167         /* Initialize tlv320aic23b */
 168
 169         /* RESET */
 170         tlv320aic23b_write(sd, 15, 0x000);
 171         /* turn off DAC & mic input */
 172         tlv320aic23b_write(sd, 6, 0x00A);
 173         /* left-justified, 24-bit, master mode */
 174         tlv320aic23b_write(sd, 7, 0x049);
 175         /* set gain on both channels to +3.0 dB */
 176         tlv320aic23b_write(sd, 0, 0x119);
 177         /* set sample rate to 48 kHz */
 178         tlv320aic23b_write(sd, 8, 0x000);
 179         /* activate digital interface */
 180         tlv320aic23b_write(sd, 9, 0x001);
 181         return 0;
 182 }
 183
 184 static int tlv320aic23b_remove(struct i2c_client *client)
 185 {
 186         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 187
 188         v4l2_device_unregister_subdev(sd);
 189         kfree(to_state(sd));
 190         return 0;
 191 }
 192
 193 /* ----------------------------------------------------------------------- */
 194
 195 static const struct i2c_device_id tlv320aic23b_id[] = {
 196         { "tlv320aic23b", 0 },
 197         { }
 198 };
 199 MODULE_DEVICE_TABLE(i2c, tlv320aic23b_id);
 200
 201 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 202         .name = "tlv320aic23b",
 203         .probe = tlv320aic23b_probe,
 204         .remove = tlv320aic23b_remove,
 205         .id_table = tlv320aic23b_id,
 206 };