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/videodev.h>
  33 #include <media/v4l2-common.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
  43 I2C_CLIENT_INSMOD;
  44
  45 /* ----------------------------------------------------------------------- */
  46
  47 struct tlv320aic23b_state {
  48         u8 muted;
  49 };
  50
  51 static int tlv320aic23b_write(struct i2c_client *client, int reg, u16 val)
  52 {
  53         int i;
  54
  55         if ((reg < 0 || reg > 9) && (reg != 15)) {
  56                 v4l_err(client, "Invalid register R%d\n", reg);
  57                 return -1;
  58         }
  59
  60         for (i = 0; i < 3; i++)
  61                 if (i2c_smbus_write_byte_data(client,
  62                                 (reg << 1) | (val >> 8), val & 0xff) == 0)
  63                         return 0;
  64         v4l_err(client, "I2C: cannot write %03x to register R%d\n", val, reg);
  65         return -1;
  66 }
  67
  68 static int tlv320aic23b_command(struct i2c_client *client,
  69                                 unsigned int cmd, void *arg)
  70 {
  71         struct tlv320aic23b_state *state = i2c_get_clientdata(client);
  72         struct v4l2_control *ctrl = arg;
  73         u32 *freq = arg;
  74
  75         switch (cmd) {
  76         case VIDIOC_INT_AUDIO_CLOCK_FREQ:
  77                 switch (*freq) {
  78                 case 32000: /* set sample rate to 32 kHz */
  79                         tlv320aic23b_write(client, 8, 0x018);
  80                         break;
  81                 case 44100: /* set sample rate to 44.1 kHz */
  82                         tlv320aic23b_write(client, 8, 0x022);
  83                         break;
  84                 case 48000: /* set sample rate to 48 kHz */
  85                         tlv320aic23b_write(client, 8, 0x000);
  86                         break;
  87                 default:
  88                         return -EINVAL;
  89                 }
  90                 break;
  91
  92         case VIDIOC_G_CTRL:
  93                 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
  94                         return -EINVAL;
  95                 ctrl->value = state->muted;
  96                 break;
  97
  98         case VIDIOC_S_CTRL:
  99                 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
 100                         return -EINVAL;
 101                 state->muted = ctrl->value;
 102                 tlv320aic23b_write(client, 0, 0x180); /* mute both channels */
 103                 /* set gain on both channels to +3.0 dB */
 104                 if (!state->muted)
 105                         tlv320aic23b_write(client, 0, 0x119);
 106                 break;
 107
 108         case VIDIOC_LOG_STATUS:
 109                 v4l_info(client, "Input: %s\n",
 110                             state->muted ? "muted" : "active");
 111                 break;
 112
 113         default:
 114                 return -EINVAL;
 115         }
 116         return 0;
 117 }
 118
 119 /* ----------------------------------------------------------------------- */
 120
 121 /* i2c implementation */
 122
 123 /*
 124  * Generic i2c probe
 125  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 126  */
 127
 128 static int tlv320aic23b_probe(struct i2c_client *client)
 129 {
 130         struct tlv320aic23b_state *state;
 131
 132         /* Check if the adapter supports the needed features */
 133         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 134                 return -EIO;
 135
 136         v4l_info(client, "chip found @ 0x%x (%s)\n",
 137                         client->addr << 1, client->adapter->name);
 138
 139         state = kmalloc(sizeof(struct tlv320aic23b_state), GFP_KERNEL);
 140         if (state == NULL)
 141                 return -ENOMEM;
 142         state->muted = 0;
 143         i2c_set_clientdata(client, state);
 144
 145         /* Initialize tlv320aic23b */
 146
 147         /* RESET */
 148         tlv320aic23b_write(client, 15, 0x000);
 149         /* turn off DAC & mic input */
 150         tlv320aic23b_write(client, 6, 0x00A);
 151         /* left-justified, 24-bit, master mode */
 152         tlv320aic23b_write(client, 7, 0x049);
 153         /* set gain on both channels to +3.0 dB */
 154         tlv320aic23b_write(client, 0, 0x119);
 155         /* set sample rate to 48 kHz */
 156         tlv320aic23b_write(client, 8, 0x000);
 157         /* activate digital interface */
 158         tlv320aic23b_write(client, 9, 0x001);
 159         return 0;
 160 }
 161
 162 static int tlv320aic23b_remove(struct i2c_client *client)
 163 {
 164         kfree(i2c_get_clientdata(client));
 165         return 0;
 166 }
 167
 168 /* ----------------------------------------------------------------------- */
 169
 170
 171 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 172         .name = "tlv320aic23b",
 173         .driverid = I2C_DRIVERID_TLV320AIC23B,
 174         .command = tlv320aic23b_command,
 175         .probe = tlv320aic23b_probe,
 176         .remove = tlv320aic23b_remove,
 177 };