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 #include <media/v4l2-i2c-drv-legacy.h>
  38
  39 MODULE_DESCRIPTION("wm8775 driver");
  40 MODULE_AUTHOR("Ulf Eklund, Hans Verkuil");
  41 MODULE_LICENSE("GPL");
  42
  43 static unsigned short normal_i2c[] = { 0x36 >> 1, I2C_CLIENT_END };
  44
  45
  46 I2C_CLIENT_INSMOD;
  47
  48
  49 /* ----------------------------------------------------------------------- */
  50
  51 enum {
  52         R7 = 7, R11 = 11,
  53         R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R23 = 23,
  54         TOT_REGS
  55 };
  56
  57 struct wm8775_state {
  58         u8 input;               /* Last selected input (0-0xf) */
  59         u8 muted;
  60 };
  61
  62 static int wm8775_write(struct i2c_client *client, int reg, u16 val)
  63 {
  64         int i;
  65
  66         if (reg < 0 || reg >= TOT_REGS) {
  67                 v4l_err(client, "Invalid register R%d\n", reg);
  68                 return -1;
  69         }
  70
  71         for (i = 0; i < 3; i++) {
  72                 if (i2c_smbus_write_byte_data(client, (reg << 1) |
  73                                         (val >> 8), val & 0xff) == 0) {
  74                         return 0;
  75                 }
  76         }
  77         v4l_err(client, "I2C: cannot write %03x to register R%d\n", val, reg);
  78         return -1;
  79 }
  80
  81 static int wm8775_command(struct i2c_client *client, unsigned int cmd, void *arg)
  82 {
  83         struct wm8775_state *state = i2c_get_clientdata(client);
  84         struct v4l2_routing *route = arg;
  85         struct v4l2_control *ctrl = arg;
  86
  87         switch (cmd) {
  88         case VIDIOC_INT_G_AUDIO_ROUTING:
  89                 route->input = state->input;
  90                 route->output = 0;
  91                 break;
  92
  93         case VIDIOC_INT_S_AUDIO_ROUTING:
  94                 /* There are 4 inputs and one output. Zero or more inputs
  95                    are multiplexed together to the output. Hence there are
  96                    16 combinations.
  97                    If only one input is active (the normal case) then the
  98                    input values 1, 2, 4 or 8 should be used. */
  99                 if (route->input > 15) {
 100                         v4l_err(client, "Invalid input %d.\n", route->input);
 101                         return -EINVAL;
 102                 }
 103                 state->input = route->input;
 104                 if (state->muted)
 105                         break;
 106                 wm8775_write(client, R21, 0x0c0);
 107                 wm8775_write(client, R14, 0x1d4);
 108                 wm8775_write(client, R15, 0x1d4);
 109                 wm8775_write(client, R21, 0x100 + state->input);
 110                 break;
 111
 112         case VIDIOC_G_CTRL:
 113                 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
 114                         return -EINVAL;
 115                 ctrl->value = state->muted;
 116                 break;
 117
 118         case VIDIOC_S_CTRL:
 119                 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
 120                         return -EINVAL;
 121                 state->muted = ctrl->value;
 122                 wm8775_write(client, R21, 0x0c0);
 123                 wm8775_write(client, R14, 0x1d4);
 124                 wm8775_write(client, R15, 0x1d4);
 125                 if (!state->muted)
 126                         wm8775_write(client, R21, 0x100 + state->input);
 127                 break;
 128
 129         case VIDIOC_G_CHIP_IDENT:
 130                 return v4l2_chip_ident_i2c_client(client, arg, V4L2_IDENT_WM8775, 0);
 131
 132         case VIDIOC_LOG_STATUS:
 133                 v4l_info(client, "Input: %d%s\n", state->input,
 134                             state->muted ? " (muted)" : "");
 135                 break;
 136
 137         case VIDIOC_S_FREQUENCY:
 138                 /* If I remove this, then it can happen that I have no
 139                    sound the first time I tune from static to a valid channel.
 140                    It's difficult to reproduce and is almost certainly related
 141                    to the zero cross detect circuit. */
 142                 wm8775_write(client, R21, 0x0c0);
 143                 wm8775_write(client, R14, 0x1d4);
 144                 wm8775_write(client, R15, 0x1d4);
 145                 wm8775_write(client, R21, 0x100 + state->input);
 146                 break;
 147
 148         default:
 149                 return -EINVAL;
 150         }
 151         return 0;
 152 }
 153
 154 /* ----------------------------------------------------------------------- */
 155
 156 /* i2c implementation */
 157
 158 /*
 159  * Generic i2c probe
 160  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 161  */
 162
 163 static int wm8775_probe(struct i2c_client *client)
 164 {
 165         struct wm8775_state *state;
 166
 167         /* Check if the adapter supports the needed features */
 168         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 169                 return -EIO;
 170
 171         v4l_info(client, "chip found @ 0x%x (%s)\n", client->addr << 1, client->adapter->name);
 172
 173         state = kmalloc(sizeof(struct wm8775_state), GFP_KERNEL);
 174         if (state == NULL) {
 175                 return -ENOMEM;
 176         }
 177         state->input = 2;
 178         state->muted = 0;
 179         i2c_set_clientdata(client, state);
 180
 181         /* initialize wm8775 */
 182         wm8775_write(client, R23, 0x000);       /* RESET */
 183         wm8775_write(client, R7, 0x000);        /* Disable zero cross detect timeout */
 184         wm8775_write(client, R11, 0x021);       /* Left justified, 24-bit mode */
 185         wm8775_write(client, R12, 0x102);       /* Master mode, clock ratio 256fs */
 186         wm8775_write(client, R13, 0x000);       /* Powered up */
 187         wm8775_write(client, R14, 0x1d4);       /* ADC gain +2.5dB, enable zero cross */
 188         wm8775_write(client, R15, 0x1d4);       /* ADC gain +2.5dB, enable zero cross */
 189         wm8775_write(client, R16, 0x1bf);       /* ALC Stereo, ALC target level -1dB FS */
 190         /* max gain +8dB */
 191         wm8775_write(client, R17, 0x185);       /* Enable gain control, use zero cross */
 192         /* detection, ALC hold time 42.6 ms */
 193         wm8775_write(client, R18, 0x0a2);       /* ALC gain ramp up delay 34 s, */
 194         /* ALC gain ramp down delay 33 ms */
 195         wm8775_write(client, R19, 0x005);       /* Enable noise gate, threshold -72dBfs */
 196         wm8775_write(client, R20, 0x07a);       /* Transient window 4ms, lower PGA gain */
 197         /* limit -1dB */
 198         wm8775_write(client, R21, 0x102);       /* LRBOTH = 1, use input 2. */
 199         return 0;
 200 }
 201
 202 static int wm8775_remove(struct i2c_client *client)
 203 {
 204         kfree(i2c_get_clientdata(client));
 205         return 0;
 206 }
 207
 208 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 209         .name = "wm8775",
 210         .driverid = I2C_DRIVERID_WM8775,
 211         .command = wm8775_command,
 212         .probe = wm8775_probe,
 213         .remove = wm8775_remove,
 214 };
 215