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 = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
 170         if (client == 0)
 171                 return -ENOMEM;
 172
 173         memset(client, 0, sizeof(struct i2c_client));
 174         client->addr = address;
 175         client->adapter = adapter;
 176         client->driver = &i2c_driver;
 177         snprintf(client->name, sizeof(client->name) - 1, "wm8775");
 178
 179         v4l_info(client, "chip found @ 0x%x (%s)\n", address << 1, adapter->name);
 180
 181         state = kmalloc(sizeof(struct wm8775_state), GFP_KERNEL);
 182         if (state == NULL) {
 183                 kfree(client);
 184                 return -ENOMEM;
 185         }
 186         state->input = 2;
 187         state->muted = 0;
 188         i2c_set_clientdata(client, state);
 189
 190         /* initialize wm8775 */
 191         wm8775_write(client, R23, 0x000);       /* RESET */
 192         wm8775_write(client, R7, 0x000);        /* Disable zero cross detect timeout */
 193         wm8775_write(client, R11, 0x021);       /* Left justified, 24-bit mode */
 194         wm8775_write(client, R12, 0x102);       /* Master mode, clock ratio 256fs */
 195         wm8775_write(client, R13, 0x000);       /* Powered up */
 196         wm8775_write(client, R14, 0x1d4);       /* ADC gain +2.5dB, enable zero cross */
 197         wm8775_write(client, R15, 0x1d4);       /* ADC gain +2.5dB, enable zero cross */
 198         wm8775_write(client, R16, 0x1bf);       /* ALC Stereo, ALC target level -1dB FS */
 199         /* max gain +8dB */
 200         wm8775_write(client, R17, 0x185);       /* Enable gain control, use zero cross */
 201         /* detection, ALC hold time 42.6 ms */
 202         wm8775_write(client, R18, 0x0a2);       /* ALC gain ramp up delay 34 s, */
 203         /* ALC gain ramp down delay 33 ms */
 204         wm8775_write(client, R19, 0x005);       /* Enable noise gate, threshold -72dBfs */
 205         wm8775_write(client, R20, 0x07a);       /* Transient window 4ms, lower PGA gain */
 206         /* limit -1dB */
 207         wm8775_write(client, R21, 0x102);       /* LRBOTH = 1, use input 2. */
 208         i2c_attach_client(client);
 209
 210         return 0;
 211 }
 212
 213 static int wm8775_probe(struct i2c_adapter *adapter)
 214 {
 215         if (adapter->class & I2C_CLASS_TV_ANALOG)
 216                 return i2c_probe(adapter, &addr_data, wm8775_attach);
 217         return 0;
 218 }
 219
 220 static int wm8775_detach(struct i2c_client *client)
 221 {
 222         int err;
 223
 224         err = i2c_detach_client(client);
 225         if (err) {
 226                 return err;
 227         }
 228         kfree(client);
 229
 230         return 0;
 231 }
 232
 233 /* ----------------------------------------------------------------------- */
 234
 235 /* i2c implementation */
 236 static struct i2c_driver i2c_driver = {
 237         .driver = {
 238                 .name = "wm8775",
 239         },
 240         .id             = I2C_DRIVERID_WM8775,
 241         .attach_adapter = wm8775_probe,
 242         .detach_client  = wm8775_detach,
 243         .command        = wm8775_command,
 244 };
 245
 246
 247 static int __init wm8775_init_module(void)
 248 {
 249         return i2c_add_driver(&i2c_driver);
 250 }
 251
 252 static void __exit wm8775_cleanup_module(void)
 253 {
 254         i2c_del_driver(&i2c_driver);
 255 }
 256
 257 module_init(wm8775_init_module);
 258 module_exit(wm8775_cleanup_module);