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_CTRL:
 106                 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
 107                         return -EINVAL;
 108                 ctrl->value = state->muted;
 109                 break;
 110
 111         case VIDIOC_S_CTRL:
 112                 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
 113                         return -EINVAL;
 114                 state->muted = ctrl->value;
 115                 wm8775_write(client, R21, 0x0c0);
 116                 wm8775_write(client, R14, 0x1d4);
 117                 wm8775_write(client, R15, 0x1d4);
 118                 if (!state->muted)
 119                         wm8775_write(client, R21, 0x100 + state->input);
 120                 break;
 121
 122         case VIDIOC_LOG_STATUS:
 123                 v4l_info(client, "Input: %d%s\n", state->input,
 124                             state->muted ? " (muted)" : "");
 125                 break;
 126
 127         case VIDIOC_S_FREQUENCY:
 128                 /* If I remove this, then it can happen that I have no
 129                    sound the first time I tune from static to a valid channel.
 130                    It's difficult to reproduce and is almost certainly related
 131                    to the zero cross detect circuit. */
 132                 wm8775_write(client, R21, 0x0c0);
 133                 wm8775_write(client, R14, 0x1d4);
 134                 wm8775_write(client, R15, 0x1d4);
 135                 wm8775_write(client, R21, 0x100 + state->input);
 136                 break;
 137
 138         default:
 139                 return -EINVAL;
 140         }
 141         return 0;
 142 }
 143
 144 /* ----------------------------------------------------------------------- */
 145
 146 /* i2c implementation */
 147
 148 /*
 149  * Generic i2c probe
 150  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 151  */
 152
 153 static struct i2c_driver i2c_driver;
 154
 155 static int wm8775_attach(struct i2c_adapter *adapter, int address, int kind)
 156 {
 157         struct i2c_client *client;
 158         struct wm8775_state *state;
 159
 160         /* Check if the adapter supports the needed features */
 161         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 162                 return 0;
 163
 164         client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
 165         if (client == 0)
 166                 return -ENOMEM;
 167
 168         client->addr = address;
 169         client->adapter = adapter;
 170         client->driver = &i2c_driver;
 171         snprintf(client->name, sizeof(client->name) - 1, "wm8775");
 172
 173         v4l_info(client, "chip found @ 0x%x (%s)\n", address << 1, adapter->name);
 174
 175         state = kmalloc(sizeof(struct wm8775_state), GFP_KERNEL);
 176         if (state == NULL) {
 177                 kfree(client);
 178                 return -ENOMEM;
 179         }
 180         state->input = 2;
 181         state->muted = 0;
 182         i2c_set_clientdata(client, state);
 183
 184         /* initialize wm8775 */
 185         wm8775_write(client, R23, 0x000);       /* RESET */
 186         wm8775_write(client, R7, 0x000);        /* Disable zero cross detect timeout */
 187         wm8775_write(client, R11, 0x021);       /* Left justified, 24-bit mode */
 188         wm8775_write(client, R12, 0x102);       /* Master mode, clock ratio 256fs */
 189         wm8775_write(client, R13, 0x000);       /* Powered up */
 190         wm8775_write(client, R14, 0x1d4);       /* ADC gain +2.5dB, enable zero cross */
 191         wm8775_write(client, R15, 0x1d4);       /* ADC gain +2.5dB, enable zero cross */
 192         wm8775_write(client, R16, 0x1bf);       /* ALC Stereo, ALC target level -1dB FS */
 193         /* max gain +8dB */
 194         wm8775_write(client, R17, 0x185);       /* Enable gain control, use zero cross */
 195         /* detection, ALC hold time 42.6 ms */
 196         wm8775_write(client, R18, 0x0a2);       /* ALC gain ramp up delay 34 s, */
 197         /* ALC gain ramp down delay 33 ms */
 198         wm8775_write(client, R19, 0x005);       /* Enable noise gate, threshold -72dBfs */
 199         wm8775_write(client, R20, 0x07a);       /* Transient window 4ms, lower PGA gain */
 200         /* limit -1dB */
 201         wm8775_write(client, R21, 0x102);       /* LRBOTH = 1, use input 2. */
 202         i2c_attach_client(client);
 203
 204         return 0;
 205 }
 206
 207 static int wm8775_probe(struct i2c_adapter *adapter)
 208 {
 209         if (adapter->class & I2C_CLASS_TV_ANALOG)
 210                 return i2c_probe(adapter, &addr_data, wm8775_attach);
 211         return 0;
 212 }
 213
 214 static int wm8775_detach(struct i2c_client *client)
 215 {
 216         int err;
 217
 218         err = i2c_detach_client(client);
 219         if (err) {
 220                 return err;
 221         }
 222         kfree(client);
 223
 224         return 0;
 225 }
 226
 227 /* ----------------------------------------------------------------------- */
 228
 229 /* i2c implementation */
 230 static struct i2c_driver i2c_driver = {
 231         .driver = {
 232                 .name = "wm8775",
 233         },
 234         .id             = I2C_DRIVERID_WM8775,
 235         .attach_adapter = wm8775_probe,
 236         .detach_client  = wm8775_detach,
 237         .command        = wm8775_command,
 238 };
 239
 240
 241 static int __init wm8775_init_module(void)
 242 {
 243         return i2c_add_driver(&i2c_driver);
 244 }
 245
 246 static void __exit wm8775_cleanup_module(void)
 247 {
 248         i2c_del_driver(&i2c_driver);
 249 }
 250
 251 module_init(wm8775_init_module);
 252 module_exit(wm8775_cleanup_module);