git.oblomov.eu Git - linux-2.6/blob - drivers/media/video/wm8775.c

   1 /*
   2  * wm8775 - driver version 0.0.1
   3  *
   4  * Copyright (C) 2004 Ulf Eklund <ivtv at eklund.to>
   5  *
   6  * Based on saa7115 driver
   7  *
   8  * Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
   9  * - Cleanup
  10  * - V4L2 API update
  11  * - sound fixes
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  26  */
  27
  28 #include <linux/module.h>
  29 #include <linux/types.h>
  30 #include <linux/ioctl.h>
  31 #include <asm/uaccess.h>
  32 #include <linux/i2c.h>
  33 #include <linux/i2c-id.h>
  34 #include <linux/videodev.h>
  35 #include <media/v4l2-common.h>
  36
  37 MODULE_DESCRIPTION("wm8775 driver");
  38 MODULE_AUTHOR("Ulf Eklund, Hans Verkuil");
  39 MODULE_LICENSE("GPL");
  40
  41 static unsigned short normal_i2c[] = { 0x36 >> 1, I2C_CLIENT_END };
  42
  43
  44 I2C_CLIENT_INSMOD;
  45
  46 /* ----------------------------------------------------------------------- */
  47
  48 enum {
  49         R7 = 7, R11 = 11,
  50         R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R23 = 23,
  51         TOT_REGS
  52 };
  53
  54 struct wm8775_state {
  55         u8 input;               /* Last selected input (0-0xf) */
  56         u8 muted;
  57 };
  58
  59 static int wm8775_write(struct i2c_client *client, int reg, u16 val)
  60 {
  61         int i;
  62
  63         if (reg < 0 || reg >= TOT_REGS) {
  64                 v4l_err(client, "Invalid register R%d\n", reg);
  65                 return -1;
  66         }
  67
  68         for (i = 0; i < 3; i++) {
  69                 if (i2c_smbus_write_byte_data(client, (reg << 1) |
  70                                         (val >> 8), val & 0xff) == 0) {
  71                         return 0;
  72                 }
  73         }
  74         v4l_err(client, "I2C: cannot write %03x to register R%d\n", val, reg);
  75         return -1;
  76 }
  77
  78 static int wm8775_command(struct i2c_client *client, unsigned int cmd,
  79                           void *arg)
  80 {
  81         struct wm8775_state *state = i2c_get_clientdata(client);
  82         struct v4l2_audio *input = arg;
  83         struct v4l2_control *ctrl = arg;
  84
  85         switch (cmd) {
  86         case VIDIOC_S_AUDIO:
  87                 /* There are 4 inputs and one output. Zero or more inputs
  88                    are multiplexed together to the output. Hence there are
  89                    16 combinations.
  90                    If only one input is active (the normal case) then the
  91                    input values 1, 2, 4 or 8 should be used. */
  92                 if (input->index > 15) {
  93                         v4l_err(client, "Invalid input %d.\n", input->index);
  94                         return -EINVAL;
  95                 }
  96                 state->input = input->index;
  97                 if (state->muted)
  98                         break;
  99                 wm8775_write(client, R21, 0x0c0);
 100                 wm8775_write(client, R14, 0x1d4);
 101                 wm8775_write(client, R15, 0x1d4);
 102                 wm8775_write(client, R21, 0x100 + state->input);
 103                 break;
 104
 105         case VIDIOC_G_AUDIO:
 106                 memset(input, 0, sizeof(*input));
 107                 input->index = state->input;
 108                 break;
 109
 110         case VIDIOC_G_CTRL:
 111                 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
 112                         return -EINVAL;
 113                 ctrl->value = state->muted;
 114                 break;
 115
 116         case VIDIOC_S_CTRL:
 117                 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
 118                         return -EINVAL;
 119                 state->muted = ctrl->value;
 120                 wm8775_write(client, R21, 0x0c0);
 121                 wm8775_write(client, R14, 0x1d4);
 122                 wm8775_write(client, R15, 0x1d4);
 123                 if (!state->muted)
 124                         wm8775_write(client, R21, 0x100 + state->input);
 125                 break;
 126
 127         case VIDIOC_LOG_STATUS:
 128                 v4l_info(client, "Input: %d%s\n", state->input,
 129                             state->muted ? " (muted)" : "");
 130                 break;
 131
 132         case VIDIOC_S_FREQUENCY:
 133                 /* If I remove this, then it can happen that I have no
 134                    sound the first time I tune from static to a valid channel.
 135                    It's difficult to reproduce and is almost certainly related
 136                    to the zero cross detect circuit. */
 137                 wm8775_write(client, R21, 0x0c0);
 138                 wm8775_write(client, R14, 0x1d4);
 139                 wm8775_write(client, R15, 0x1d4);
 140                 wm8775_write(client, R21, 0x100 + state->input);
 141                 break;
 142
 143         default:
 144                 return -EINVAL;
 145         }
 146         return 0;
 147 }
 148
 149 /* ----------------------------------------------------------------------- */
 150
 151 /* i2c implementation */
 152
 153 /*
 154  * Generic i2c probe
 155  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 156  */
 157
 158 static struct i2c_driver i2c_driver;
 159
 160 static int wm8775_attach(struct i2c_adapter *adapter, int address, int kind)
 161 {
 162         struct i2c_client *client;
 163         struct wm8775_state *state;
 164
 165         /* Check if the adapter supports the needed features */
 166         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 167                 return 0;
 168
 169         client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
 170         if (client == 0)
 171                 return -ENOMEM;
 172
 173         client->addr = address;
 174         client->adapter = adapter;
 175         client->driver = &i2c_driver;
 176         snprintf(client->name, sizeof(client->name) - 1, "wm8775");
 177
 178         v4l_info(client, "chip found @ 0x%x (%s)\n", address << 1, adapter->name);
 179
 180         state = kmalloc(sizeof(struct wm8775_state), GFP_KERNEL);
 181         if (state == NULL) {
 182                 kfree(client);
 183                 return -ENOMEM;
 184         }
 185         state->input = 2;
 186         state->muted = 0;
 187         i2c_set_clientdata(client, state);
 188
 189         /* initialize wm8775 */
 190         wm8775_write(client, R23, 0x000);       /* RESET */
 191         wm8775_write(client, R7, 0x000);        /* Disable zero cross detect timeout */
 192         wm8775_write(client, R11, 0x021);       /* Left justified, 24-bit mode */
 193         wm8775_write(client, R12, 0x102);       /* Master mode, clock ratio 256fs */
 194         wm8775_write(client, R13, 0x000);       /* Powered up */
 195         wm8775_write(client, R14, 0x1d4);       /* ADC gain +2.5dB, enable zero cross */
 196         wm8775_write(client, R15, 0x1d4);       /* ADC gain +2.5dB, enable zero cross */
 197         wm8775_write(client, R16, 0x1bf);       /* ALC Stereo, ALC target level -1dB FS */
 198         /* max gain +8dB */
 199         wm8775_write(client, R17, 0x185);       /* Enable gain control, use zero cross */
 200         /* detection, ALC hold time 42.6 ms */
 201         wm8775_write(client, R18, 0x0a2);       /* ALC gain ramp up delay 34 s, */
 202         /* ALC gain ramp down delay 33 ms */
 203         wm8775_write(client, R19, 0x005);       /* Enable noise gate, threshold -72dBfs */
 204         wm8775_write(client, R20, 0x07a);       /* Transient window 4ms, lower PGA gain */
 205         /* limit -1dB */
 206         wm8775_write(client, R21, 0x102);       /* LRBOTH = 1, use input 2. */
 207         i2c_attach_client(client);
 208
 209         return 0;
 210 }
 211
 212 static int wm8775_probe(struct i2c_adapter *adapter)
 213 {
 214         if (adapter->class & I2C_CLASS_TV_ANALOG)
 215                 return i2c_probe(adapter, &addr_data, wm8775_attach);
 216         return 0;
 217 }
 218
 219 static int wm8775_detach(struct i2c_client *client)
 220 {
 221         int err;
 222
 223         err = i2c_detach_client(client);
 224         if (err) {
 225                 return err;
 226         }
 227         kfree(client);
 228
 229         return 0;
 230 }
 231
 232 /* ----------------------------------------------------------------------- */
 233
 234 /* i2c implementation */
 235 static struct i2c_driver i2c_driver = {
 236         .driver = {
 237                 .name = "wm8775",
 238         },
 239         .id             = I2C_DRIVERID_WM8775,
 240         .attach_adapter = wm8775_probe,
 241         .detach_client  = wm8775_detach,
 242         .command        = wm8775_command,
 243 };
 244
 245
 246 static int __init wm8775_init_module(void)
 247 {
 248         return i2c_add_driver(&i2c_driver);
 249 }
 250
 251 static void __exit wm8775_cleanup_module(void)
 252 {
 253         i2c_del_driver(&i2c_driver);
 254 }
 255
 256 module_init(wm8775_init_module);
 257 module_exit(wm8775_cleanup_module);