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