release/src-rt-6.x.4708/linux/linux-2.6.36/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/i2c-id.h>
  33 #include <linux/videodev2.h>
  34 #include <media/v4l2-device.h>
  35 #include <media/v4l2-i2c-drv.h>
  36
  37 MODULE_DESCRIPTION("tlv320aic23b driver");
  38 MODULE_AUTHOR("Scott Alfter, Ulf Eklund, Hans Verkuil");
  39 MODULE_LICENSE("GPL");
  40
  41
  42 /* ----------------------------------------------------------------------- */
  43
  44 struct tlv320aic23b_state {
  45         struct v4l2_subdev sd;
  46         u8 muted;
  47 };
  48
  49 static inline struct tlv320aic23b_state *to_state(struct v4l2_subdev *sd)
  50 {
  51         return container_of(sd, struct tlv320aic23b_state, sd);
  52 }
  53
  54 static int tlv320aic23b_write(struct v4l2_subdev *sd, int reg, u16 val)
  55 {
  56         struct i2c_client *client = v4l2_get_subdevdata(sd);
  57         int i;
  58
  59         if ((reg < 0 || reg > 9) && (reg != 15)) {
  60                 v4l2_err(sd, "Invalid register R%d\n", reg);
  61                 return -1;
  62         }
  63
  64         for (i = 0; i < 3; i++)
  65                 if (i2c_smbus_write_byte_data(client,
  66                                 (reg << 1) | (val >> 8), val & 0xff) == 0)
  67                         return 0;
  68         v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
  69         return -1;
  70 }
  71
  72 static int tlv320aic23b_s_clock_freq(struct v4l2_subdev *sd, u32 freq)
  73 {
  74         switch (freq) {
  75         case 32000: /* set sample rate to 32 kHz */
  76                 tlv320aic23b_write(sd, 8, 0x018);
  77                 break;
  78         case 44100: /* set sample rate to 44.1 kHz */
  79                 tlv320aic23b_write(sd, 8, 0x022);
  80                 break;
  81         case 48000: /* set sample rate to 48 kHz */
  82                 tlv320aic23b_write(sd, 8, 0x000);
  83                 break;
  84         default:
  85                 return -EINVAL;
  86         }
  87         return 0;
  88 }
  89
  90 static int tlv320aic23b_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
  91 {
  92         struct tlv320aic23b_state *state = to_state(sd);
  93
  94         if (ctrl->id != V4L2_CID_AUDIO_MUTE)
  95                 return -EINVAL;
  96         ctrl->value = state->muted;
  97         return 0;
  98 }
  99
 100 static int tlv320aic23b_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 101 {
 102         struct tlv320aic23b_state *state = to_state(sd);
 103
 104         if (ctrl->id != V4L2_CID_AUDIO_MUTE)
 105                 return -EINVAL;
 106         state->muted = ctrl->value;
 107         tlv320aic23b_write(sd, 0, 0x180); /* mute both channels */
 108         /* set gain on both channels to +3.0 dB */
 109         if (!state->muted)
 110                 tlv320aic23b_write(sd, 0, 0x119);
 111         return 0;
 112 }
 113
 114 static int tlv320aic23b_log_status(struct v4l2_subdev *sd)
 115 {
 116         struct tlv320aic23b_state *state = to_state(sd);
 117
 118         v4l2_info(sd, "Input: %s\n", state->muted ? "muted" : "active");
 119         return 0;
 120 }
 121
 122 /* ----------------------------------------------------------------------- */
 123
 124 static const struct v4l2_subdev_core_ops tlv320aic23b_core_ops = {
 125         .log_status = tlv320aic23b_log_status,
 126         .g_ctrl = tlv320aic23b_g_ctrl,
 127         .s_ctrl = tlv320aic23b_s_ctrl,
 128 };
 129
 130 static const struct v4l2_subdev_audio_ops tlv320aic23b_audio_ops = {
 131         .s_clock_freq = tlv320aic23b_s_clock_freq,
 132 };
 133
 134 static const struct v4l2_subdev_ops tlv320aic23b_ops = {
 135         .core = &tlv320aic23b_core_ops,
 136         .audio = &tlv320aic23b_audio_ops,
 137 };
 138
 139 /* ----------------------------------------------------------------------- */
 140
 141 /* i2c implementation */
 142
 143 /*
 144  * Generic i2c probe
 145  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 146  */
 147
 148 static int tlv320aic23b_probe(struct i2c_client *client,
 149                               const struct i2c_device_id *id)
 150 {
 151         struct tlv320aic23b_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 = kzalloc(sizeof(struct tlv320aic23b_state), GFP_KERNEL);
 162         if (state == NULL)
 163                 return -ENOMEM;
 164         sd = &state->sd;
 165         v4l2_i2c_subdev_init(sd, client, &tlv320aic23b_ops);
 166         state->muted = 0;
 167
 168         /* Initialize tlv320aic23b */
 169
 170         /* RESET */
 171         tlv320aic23b_write(sd, 15, 0x000);
 172         /* turn off DAC & mic input */
 173         tlv320aic23b_write(sd, 6, 0x00A);
 174         /* left-justified, 24-bit, master mode */
 175         tlv320aic23b_write(sd, 7, 0x049);
 176         /* set gain on both channels to +3.0 dB */
 177         tlv320aic23b_write(sd, 0, 0x119);
 178         /* set sample rate to 48 kHz */
 179         tlv320aic23b_write(sd, 8, 0x000);
 180         /* activate digital interface */
 181         tlv320aic23b_write(sd, 9, 0x001);
 182         return 0;
 183 }
 184
 185 static int tlv320aic23b_remove(struct i2c_client *client)
 186 {
 187         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 188
 189         v4l2_device_unregister_subdev(sd);
 190         kfree(to_state(sd));
 191         return 0;
 192 }
 193
 194 /* ----------------------------------------------------------------------- */
 195
 196 static const struct i2c_device_id tlv320aic23b_id[] = {
 197         { "tlv320aic23b", 0 },
 198         { }
 199 };
 200 MODULE_DEVICE_TABLE(i2c, tlv320aic23b_id);
 201
 202 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 203         .name = "tlv320aic23b",
 204         .probe = tlv320aic23b_probe,
 205         .remove = tlv320aic23b_remove,
 206         .id_table = tlv320aic23b_id,
 207 };