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 #include <media/v4l2-chip-ident.h>
  37
  38 MODULE_DESCRIPTION("wm8775 driver");
  39 MODULE_AUTHOR("Ulf Eklund, Hans Verkuil");
  40 MODULE_LICENSE("GPL");
  41
  42 static unsigned short normal_i2c[] = { 0x36 >> 1, I2C_CLIENT_END };
  43
  44
  45 I2C_CLIENT_INSMOD;
  46
  47 /* ----------------------------------------------------------------------- */
  48
  49 enum {
  50         R7 = 7, R11 = 11,
  51         R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R23 = 23,
  52         TOT_REGS
  53 };
  54
  55 struct wm8775_state {
  56         u8 input;               /* Last selected input (0-0xf) */
  57         u8 muted;
  58 };
  59
  60 static int wm8775_write(struct i2c_client *client, int reg, u16 val)
  61 {
  62         int i;
  63
  64         if (reg < 0 || reg >= TOT_REGS) {
  65                 v4l_err(client, "Invalid register R%d\n", reg);
  66                 return -1;
  67         }
  68
  69         for (i = 0; i < 3; i++) {
  70                 if (i2c_smbus_write_byte_data(client, (reg << 1) |
  71                                         (val >> 8), val & 0xff) == 0) {
  72                         return 0;
  73                 }
  74         }
  75         v4l_err(client, "I2C: cannot write %03x to register R%d\n", val, reg);
  76         return -1;
  77 }
  78
  79 static int wm8775_command(struct i2c_client *client, unsigned int cmd,
  80                           void *arg)
  81 {
  82         struct wm8775_state *state = i2c_get_clientdata(client);
  83         struct v4l2_routing *route = arg;
  84         struct v4l2_control *ctrl = arg;
  85
  86         switch (cmd) {
  87         case VIDIOC_INT_G_AUDIO_ROUTING:
  88                 route->input = state->input;
  89                 route->output = 0;
  90                 break;
  91
  92         case VIDIOC_INT_S_AUDIO_ROUTING:
  93                 /* There are 4 inputs and one output. Zero or more inputs
  94                    are multiplexed together to the output. Hence there are
  95                    16 combinations.
  96                    If only one input is active (the normal case) then the
  97                    input values 1, 2, 4 or 8 should be used. */
  98                 if (route->input > 15) {
  99                         v4l_err(client, "Invalid input %d.\n", route->input);
 100                         return -EINVAL;
 101                 }
 102                 state->input = route->input;
 103                 if (state->muted)
 104                         break;
 105                 wm8775_write(client, R21, 0x0c0);
 106                 wm8775_write(client, R14, 0x1d4);
 107                 wm8775_write(client, R15, 0x1d4);
 108                 wm8775_write(client, R21, 0x100 + state->input);
 109                 break;
 110
 111         case VIDIOC_G_CTRL:
 112                 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
 113                         return -EINVAL;
 114                 ctrl->value = state->muted;
 115                 break;
 116
 117         case VIDIOC_S_CTRL:
 118                 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
 119                         return -EINVAL;
 120                 state->muted = ctrl->value;
 121                 wm8775_write(client, R21, 0x0c0);
 122                 wm8775_write(client, R14, 0x1d4);
 123                 wm8775_write(client, R15, 0x1d4);
 124                 if (!state->muted)
 125                         wm8775_write(client, R21, 0x100 + state->input);
 126                 break;
 127
 128         case VIDIOC_G_CHIP_IDENT:
 129                 return v4l2_chip_ident_i2c_client(client, arg, V4L2_IDENT_WM8775, 0);
 130
 131         case VIDIOC_LOG_STATUS:
 132                 v4l_info(client, "Input: %d%s\n", state->input,
 133                             state->muted ? " (muted)" : "");
 134                 break;
 135
 136         case VIDIOC_S_FREQUENCY:
 137                 /* If I remove this, then it can happen that I have no
 138                    sound the first time I tune from static to a valid channel.
 139                    It's difficult to reproduce and is almost certainly related
 140                    to the zero cross detect circuit. */
 141                 wm8775_write(client, R21, 0x0c0);
 142                 wm8775_write(client, R14, 0x1d4);
 143                 wm8775_write(client, R15, 0x1d4);
 144                 wm8775_write(client, R21, 0x100 + state->input);
 145                 break;
 146
 147         default:
 148                 return -EINVAL;
 149         }
 150         return 0;
 151 }
 152
 153 /* ----------------------------------------------------------------------- */
 154
 155 /* i2c implementation */
 156
 157 /*
 158  * Generic i2c probe
 159  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 160  */
 161
 162 static struct i2c_driver i2c_driver;
 163
 164 static int wm8775_attach(struct i2c_adapter *adapter, int address, int kind)
 165 {
 166         struct i2c_client *client;
 167         struct wm8775_state *state;
 168
 169         /* Check if the adapter supports the needed features */
 170         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 171                 return 0;
 172
 173         client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
 174         if (client == 0)
 175                 return -ENOMEM;
 176
 177         client->addr = address;
 178         client->adapter = adapter;
 179         client->driver = &i2c_driver;
 180         snprintf(client->name, sizeof(client->name) - 1, "wm8775");
 181
 182         v4l_info(client, "chip found @ 0x%x (%s)\n", address << 1, adapter->name);
 183
 184         state = kmalloc(sizeof(struct wm8775_state), GFP_KERNEL);
 185         if (state == NULL) {
 186                 kfree(client);
 187                 return -ENOMEM;
 188         }
 189         state->input = 2;
 190         state->muted = 0;
 191         i2c_set_clientdata(client, state);
 192
 193         /* initialize wm8775 */
 194         wm8775_write(client, R23, 0x000);       /* RESET */
 195         wm8775_write(client, R7, 0x000);        /* Disable zero cross detect timeout */
 196         wm8775_write(client, R11, 0x021);       /* Left justified, 24-bit mode */
 197         wm8775_write(client, R12, 0x102);       /* Master mode, clock ratio 256fs */
 198         wm8775_write(client, R13, 0x000);       /* Powered up */
 199         wm8775_write(client, R14, 0x1d4);       /* ADC gain +2.5dB, enable zero cross */
 200         wm8775_write(client, R15, 0x1d4);       /* ADC gain +2.5dB, enable zero cross */
 201         wm8775_write(client, R16, 0x1bf);       /* ALC Stereo, ALC target level -1dB FS */
 202         /* max gain +8dB */
 203         wm8775_write(client, R17, 0x185);       /* Enable gain control, use zero cross */
 204         /* detection, ALC hold time 42.6 ms */
 205         wm8775_write(client, R18, 0x0a2);       /* ALC gain ramp up delay 34 s, */
 206         /* ALC gain ramp down delay 33 ms */
 207         wm8775_write(client, R19, 0x005);       /* Enable noise gate, threshold -72dBfs */
 208         wm8775_write(client, R20, 0x07a);       /* Transient window 4ms, lower PGA gain */
 209         /* limit -1dB */
 210         wm8775_write(client, R21, 0x102);       /* LRBOTH = 1, use input 2. */
 211         i2c_attach_client(client);
 212
 213         return 0;
 214 }
 215
 216 static int wm8775_probe(struct i2c_adapter *adapter)
 217 {
 218         if (adapter->class & I2C_CLASS_TV_ANALOG)
 219                 return i2c_probe(adapter, &addr_data, wm8775_attach);
 220         return 0;
 221 }
 222
 223 static int wm8775_detach(struct i2c_client *client)
 224 {
 225         struct wm8775_state *state = i2c_get_clientdata(client);
 226         int err;
 227
 228         err = i2c_detach_client(client);
 229         if (err) {
 230                 return err;
 231         }
 232         kfree(state);
 233         kfree(client);
 234
 235         return 0;
 236 }
 237
 238 /* ----------------------------------------------------------------------- */
 239
 240 /* i2c implementation */
 241 static struct i2c_driver i2c_driver = {
 242         .driver = {
 243                 .name = "wm8775",
 244         },
 245         .id             = I2C_DRIVERID_WM8775,
 246         .attach_adapter = wm8775_probe,
 247         .detach_client  = wm8775_detach,
 248         .command        = wm8775_command,
 249 };
 250
 251
 252 static int __init wm8775_init_module(void)
 253 {
 254         return i2c_add_driver(&i2c_driver);
 255 }
 256
 257 static void __exit wm8775_cleanup_module(void)
 258 {
 259         i2c_del_driver(&i2c_driver);
 260 }
 261
 262 module_init(wm8775_init_module);
 263 module_exit(wm8775_cleanup_module);