kernel/2.6.29.6-aldebaran-rt/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-legacy.h>
  35
  36 MODULE_DESCRIPTION("tlv320aic23b driver");
  37 MODULE_AUTHOR("Scott Alfter, Ulf Eklund, Hans Verkuil");
  38 MODULE_LICENSE("GPL");
  39
  40 static unsigned short normal_i2c[] = { 0x34 >> 1, I2C_CLIENT_END };
  41
  42 I2C_CLIENT_INSMOD;
  43
  44 /* ----------------------------------------------------------------------- */
  45
  46 struct tlv320aic23b_state {
  47         struct v4l2_subdev sd;
  48         u8 muted;
  49 };
  50
  51 static inline struct tlv320aic23b_state *to_state(struct v4l2_subdev *sd)
  52 {
  53         return container_of(sd, struct tlv320aic23b_state, sd);
  54 }
  55
  56 static int tlv320aic23b_write(struct v4l2_subdev *sd, int reg, u16 val)
  57 {
  58         struct i2c_client *client = v4l2_get_subdevdata(sd);
  59         int i;
  60
  61         if ((reg < 0 || reg > 9) && (reg != 15)) {
  62                 v4l2_err(sd, "Invalid register R%d\n", reg);
  63                 return -1;
  64         }
  65
  66         for (i = 0; i < 3; i++)
  67                 if (i2c_smbus_write_byte_data(client,
  68                                 (reg << 1) | (val >> 8), val & 0xff) == 0)
  69                         return 0;
  70         v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
  71         return -1;
  72 }
  73
  74 static int tlv320aic23b_s_clock_freq(struct v4l2_subdev *sd, u32 freq)
  75 {
  76         switch (freq) {
  77         case 32000: /* set sample rate to 32 kHz */
  78                 tlv320aic23b_write(sd, 8, 0x018);
  79                 break;
  80         case 44100: /* set sample rate to 44.1 kHz */
  81                 tlv320aic23b_write(sd, 8, 0x022);
  82                 break;
  83         case 48000: /* set sample rate to 48 kHz */
  84                 tlv320aic23b_write(sd, 8, 0x000);
  85                 break;
  86         default:
  87                 return -EINVAL;
  88         }
  89         return 0;
  90 }
  91
  92 static int tlv320aic23b_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
  93 {
  94         struct tlv320aic23b_state *state = to_state(sd);
  95
  96         if (ctrl->id != V4L2_CID_AUDIO_MUTE)
  97                 return -EINVAL;
  98         ctrl->value = state->muted;
  99         return 0;
 100 }
 101
 102 static int tlv320aic23b_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 103 {
 104         struct tlv320aic23b_state *state = to_state(sd);
 105
 106         if (ctrl->id != V4L2_CID_AUDIO_MUTE)
 107                 return -EINVAL;
 108         state->muted = ctrl->value;
 109         tlv320aic23b_write(sd, 0, 0x180); /* mute both channels */
 110         /* set gain on both channels to +3.0 dB */
 111         if (!state->muted)
 112                 tlv320aic23b_write(sd, 0, 0x119);
 113         return 0;
 114 }
 115
 116 static int tlv320aic23b_log_status(struct v4l2_subdev *sd)
 117 {
 118         struct tlv320aic23b_state *state = to_state(sd);
 119
 120         v4l2_info(sd, "Input: %s\n", state->muted ? "muted" : "active");
 121         return 0;
 122 }
 123
 124 static int tlv320aic23b_command(struct i2c_client *client, unsigned cmd, void *arg)
 125 {
 126         return v4l2_subdev_command(i2c_get_clientdata(client), cmd, arg);
 127 }
 128
 129 /* ----------------------------------------------------------------------- */
 130
 131 static const struct v4l2_subdev_core_ops tlv320aic23b_core_ops = {
 132         .log_status = tlv320aic23b_log_status,
 133         .g_ctrl = tlv320aic23b_g_ctrl,
 134         .s_ctrl = tlv320aic23b_s_ctrl,
 135 };
 136
 137 static const struct v4l2_subdev_audio_ops tlv320aic23b_audio_ops = {
 138         .s_clock_freq = tlv320aic23b_s_clock_freq,
 139 };
 140
 141 static const struct v4l2_subdev_ops tlv320aic23b_ops = {
 142         .core = &tlv320aic23b_core_ops,
 143         .audio = &tlv320aic23b_audio_ops,
 144 };
 145
 146 /* ----------------------------------------------------------------------- */
 147
 148 /* i2c implementation */
 149
 150 /*
 151  * Generic i2c probe
 152  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 153  */
 154
 155 static int tlv320aic23b_probe(struct i2c_client *client,
 156                               const struct i2c_device_id *id)
 157 {
 158         struct tlv320aic23b_state *state;
 159         struct v4l2_subdev *sd;
 160
 161         /* Check if the adapter supports the needed features */
 162         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 163                 return -EIO;
 164
 165         v4l_info(client, "chip found @ 0x%x (%s)\n",
 166                         client->addr << 1, client->adapter->name);
 167
 168         state = kzalloc(sizeof(struct tlv320aic23b_state), GFP_KERNEL);
 169         if (state == NULL)
 170                 return -ENOMEM;
 171         sd = &state->sd;
 172         v4l2_i2c_subdev_init(sd, client, &tlv320aic23b_ops);
 173         state->muted = 0;
 174
 175         /* Initialize tlv320aic23b */
 176
 177         /* RESET */
 178         tlv320aic23b_write(sd, 15, 0x000);
 179         /* turn off DAC & mic input */
 180         tlv320aic23b_write(sd, 6, 0x00A);
 181         /* left-justified, 24-bit, master mode */
 182         tlv320aic23b_write(sd, 7, 0x049);
 183         /* set gain on both channels to +3.0 dB */
 184         tlv320aic23b_write(sd, 0, 0x119);
 185         /* set sample rate to 48 kHz */
 186         tlv320aic23b_write(sd, 8, 0x000);
 187         /* activate digital interface */
 188         tlv320aic23b_write(sd, 9, 0x001);
 189         return 0;
 190 }
 191
 192 static int tlv320aic23b_remove(struct i2c_client *client)
 193 {
 194         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 195
 196         v4l2_device_unregister_subdev(sd);
 197         kfree(to_state(sd));
 198         return 0;
 199 }
 200
 201 /* ----------------------------------------------------------------------- */
 202
 203 static const struct i2c_device_id tlv320aic23b_id[] = {
 204         { "tlv320aic23b", 0 },
 205         { }
 206 };
 207 MODULE_DEVICE_TABLE(i2c, tlv320aic23b_id);
 208
 209 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 210         .name = "tlv320aic23b",
 211         .driverid = I2C_DRIVERID_TLV320AIC23B,
 212         .command = tlv320aic23b_command,
 213         .probe = tlv320aic23b_probe,
 214         .remove = tlv320aic23b_remove,
 215         .id_table = tlv320aic23b_id,
 216 };