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
  35 MODULE_DESCRIPTION("tlv320aic23b driver");
  36 MODULE_AUTHOR("Scott Alfter, Ulf Eklund, Hans Verkuil");
  37 MODULE_LICENSE("GPL");
  38
  39 static unsigned short normal_i2c[] = { 0x34 >> 1, I2C_CLIENT_END };
  40
  41
  42 I2C_CLIENT_INSMOD;
  43
  44 /* ----------------------------------------------------------------------- */
  45
  46 struct tlv320aic23b_state {
  47         u8 muted;
  48 };
  49
  50 static int tlv320aic23b_write(struct i2c_client *client, int reg, u16 val)
  51 {
  52         int i;
  53
  54         if ((reg < 0 || reg > 9) && (reg != 15)) {
  55                 v4l_err(client, "Invalid register R%d\n", reg);
  56                 return -1;
  57         }
  58
  59         for (i = 0; i < 3; i++) {
  60                 if (i2c_smbus_write_byte_data(client, (reg << 1) |
  61                                         (val >> 8), val & 0xff) == 0) {
  62                         return 0;
  63                 }
  64         }
  65         v4l_err(client, "I2C: cannot write %03x to register R%d\n", val, reg);
  66         return -1;
  67 }
  68
  69 static int tlv320aic23b_command(struct i2c_client *client, unsigned int cmd,
  70                           void *arg)
  71 {
  72         struct tlv320aic23b_state *state = i2c_get_clientdata(client);
  73         struct v4l2_control *ctrl = arg;
  74         u32* freq = arg;
  75
  76         switch (cmd) {
  77         case VIDIOC_INT_AUDIO_CLOCK_FREQ:
  78                 switch (*freq) {
  79                         case 32000: /* set sample rate to 32 kHz */
  80                                 tlv320aic23b_write(client, 8, 0x018);
  81                                 break;
  82                         case 44100: /* set sample rate to 44.1 kHz */
  83                                 tlv320aic23b_write(client, 8, 0x022);
  84                                 break;
  85                         case 48000: /* set sample rate to 48 kHz */
  86                                 tlv320aic23b_write(client, 8, 0x000);
  87                                 break;
  88                         default:
  89                                 return -EINVAL;
  90                 }
  91                 break;
  92
  93         case VIDIOC_G_CTRL:
  94                 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
  95                         return -EINVAL;
  96                 ctrl->value = state->muted;
  97                 break;
  98
  99         case VIDIOC_S_CTRL:
 100                 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
 101                         return -EINVAL;
 102                 state->muted = ctrl->value;
 103                 tlv320aic23b_write(client, 0, 0x180); /* mute both channels */
 104                 /* set gain on both channels to +3.0 dB */
 105                 if (!state->muted)
 106                         tlv320aic23b_write(client, 0, 0x119);
 107                 break;
 108
 109         case VIDIOC_LOG_STATUS:
 110                 v4l_info(client, "Input: %s\n",
 111                             state->muted ? "muted" : "active");
 112                 break;
 113
 114         default:
 115                 return -EINVAL;
 116         }
 117         return 0;
 118 }
 119
 120 /* ----------------------------------------------------------------------- */
 121
 122 /* i2c implementation */
 123
 124 /*
 125  * Generic i2c probe
 126  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 127  */
 128
 129 static struct i2c_driver i2c_driver;
 130
 131 static int tlv320aic23b_attach(struct i2c_adapter *adapter, int address, int kind)
 132 {
 133         struct i2c_client *client;
 134         struct tlv320aic23b_state *state;
 135
 136         /* Check if the adapter supports the needed features */
 137         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 138                 return 0;
 139
 140         client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
 141         if (client == 0)
 142                 return -ENOMEM;
 143
 144         client->addr = address;
 145         client->adapter = adapter;
 146         client->driver = &i2c_driver;
 147         snprintf(client->name, sizeof(client->name) - 1, "tlv320aic23b");
 148
 149         v4l_info(client, "chip found @ 0x%x (%s)\n", address << 1, adapter->name);
 150
 151         state = kmalloc(sizeof(struct tlv320aic23b_state), GFP_KERNEL);
 152         if (state == NULL) {
 153                 kfree(client);
 154                 return -ENOMEM;
 155         }
 156         state->muted = 0;
 157         i2c_set_clientdata(client, state);
 158
 159         /* initialize tlv320aic23b */
 160         tlv320aic23b_write(client, 15, 0x000);  /* RESET */
 161         tlv320aic23b_write(client, 6, 0x00A);   /* turn off DAC & mic input */
 162         tlv320aic23b_write(client, 7, 0x049);   /* left-justified, 24-bit, master mode */
 163         tlv320aic23b_write(client, 0, 0x119);   /* set gain on both channels to +3.0 dB */
 164         tlv320aic23b_write(client, 8, 0x000);   /* set sample rate to 48 kHz */
 165         tlv320aic23b_write(client, 9, 0x001);   /* activate digital interface */
 166
 167         i2c_attach_client(client);
 168
 169         return 0;
 170 }
 171
 172 static int tlv320aic23b_probe(struct i2c_adapter *adapter)
 173 {
 174         if (adapter->class & I2C_CLASS_TV_ANALOG)
 175                 return i2c_probe(adapter, &addr_data, tlv320aic23b_attach);
 176         return 0;
 177 }
 178
 179 static int tlv320aic23b_detach(struct i2c_client *client)
 180 {
 181         int err;
 182
 183         err = i2c_detach_client(client);
 184         if (err) {
 185                 return err;
 186         }
 187         kfree(client);
 188
 189         return 0;
 190 }
 191
 192 /* ----------------------------------------------------------------------- */
 193
 194 /* i2c implementation */
 195 static struct i2c_driver i2c_driver = {
 196         .driver = {
 197                 .name = "tlv320aic23b",
 198         },
 199         .id             = I2C_DRIVERID_TLV320AIC23B,
 200         .attach_adapter = tlv320aic23b_probe,
 201         .detach_client  = tlv320aic23b_detach,
 202         .command        = tlv320aic23b_command,
 203 };
 204
 205
 206 static int __init tlv320aic23b_init_module(void)
 207 {
 208         return i2c_add_driver(&i2c_driver);
 209 }
 210
 211 static void __exit tlv320aic23b_cleanup_module(void)
 212 {
 213         i2c_del_driver(&i2c_driver);
 214 }
 215
 216 module_init(tlv320aic23b_init_module);
 217 module_exit(tlv320aic23b_cleanup_module);