release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/media/video/cs5345.c

   1 /*
   2  * cs5345 Cirrus Logic 24-bit, 192 kHz Stereo Audio ADC
   3  * Copyright (C) 2007 Hans Verkuil
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19
  20
  21 #include <linux/module.h>
  22 #include <linux/kernel.h>
  23 #include <linux/i2c.h>
  24 #include <linux/videodev2.h>
  25 #include <linux/slab.h>
  26 #include <media/v4l2-device.h>
  27 #include <media/v4l2-chip-ident.h>
  28 #include <media/v4l2-i2c-drv.h>
  29
  30 MODULE_DESCRIPTION("i2c device driver for cs5345 Audio ADC");
  31 MODULE_AUTHOR("Hans Verkuil");
  32 MODULE_LICENSE("GPL");
  33
  34 static int debug;
  35
  36 module_param(debug, bool, 0644);
  37
  38 MODULE_PARM_DESC(debug, "Debugging messages, 0=Off (default), 1=On");
  39
  40
  41 /* ----------------------------------------------------------------------- */
  42
  43 static inline int cs5345_write(struct v4l2_subdev *sd, u8 reg, u8 value)
  44 {
  45         struct i2c_client *client = v4l2_get_subdevdata(sd);
  46
  47         return i2c_smbus_write_byte_data(client, reg, value);
  48 }
  49
  50 static inline int cs5345_read(struct v4l2_subdev *sd, u8 reg)
  51 {
  52         struct i2c_client *client = v4l2_get_subdevdata(sd);
  53
  54         return i2c_smbus_read_byte_data(client, reg);
  55 }
  56
  57 static int cs5345_s_routing(struct v4l2_subdev *sd,
  58                             u32 input, u32 output, u32 config)
  59 {
  60         if ((input & 0xf) > 6) {
  61                 v4l2_err(sd, "Invalid input %d.\n", input);
  62                 return -EINVAL;
  63         }
  64         cs5345_write(sd, 0x09, input & 0xf);
  65         cs5345_write(sd, 0x05, input & 0xf0);
  66         return 0;
  67 }
  68
  69 static int cs5345_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
  70 {
  71         if (ctrl->id == V4L2_CID_AUDIO_MUTE) {
  72                 ctrl->value = (cs5345_read(sd, 0x04) & 0x08) != 0;
  73                 return 0;
  74         }
  75         if (ctrl->id != V4L2_CID_AUDIO_VOLUME)
  76                 return -EINVAL;
  77         ctrl->value = cs5345_read(sd, 0x07) & 0x3f;
  78         if (ctrl->value >= 32)
  79                 ctrl->value = ctrl->value - 64;
  80         return 0;
  81 }
  82
  83 static int cs5345_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
  84 {
  85         if (ctrl->id == V4L2_CID_AUDIO_MUTE) {
  86                 cs5345_write(sd, 0x04, ctrl->value ? 0x80 : 0);
  87                 return 0;
  88         }
  89         if (ctrl->id != V4L2_CID_AUDIO_VOLUME)
  90                 return -EINVAL;
  91         if (ctrl->value > 24 || ctrl->value < -24)
  92                 return -EINVAL;
  93         cs5345_write(sd, 0x07, ((u8)ctrl->value) & 0x3f);
  94         cs5345_write(sd, 0x08, ((u8)ctrl->value) & 0x3f);
  95         return 0;
  96 }
  97
  98 #ifdef CONFIG_VIDEO_ADV_DEBUG
  99 static int cs5345_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
 100 {
 101         struct i2c_client *client = v4l2_get_subdevdata(sd);
 102
 103         if (!v4l2_chip_match_i2c_client(client, &reg->match))
 104                 return -EINVAL;
 105         if (!capable(CAP_SYS_ADMIN))
 106                 return -EPERM;
 107         reg->size = 1;
 108         reg->val = cs5345_read(sd, reg->reg & 0x1f);
 109         return 0;
 110 }
 111
 112 static int cs5345_s_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
 113 {
 114         struct i2c_client *client = v4l2_get_subdevdata(sd);
 115
 116         if (!v4l2_chip_match_i2c_client(client, &reg->match))
 117                 return -EINVAL;
 118         if (!capable(CAP_SYS_ADMIN))
 119                 return -EPERM;
 120         cs5345_write(sd, reg->reg & 0x1f, reg->val & 0xff);
 121         return 0;
 122 }
 123 #endif
 124
 125 static int cs5345_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
 126 {
 127         struct i2c_client *client = v4l2_get_subdevdata(sd);
 128
 129         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_CS5345, 0);
 130 }
 131
 132 static int cs5345_log_status(struct v4l2_subdev *sd)
 133 {
 134         u8 v = cs5345_read(sd, 0x09) & 7;
 135         u8 m = cs5345_read(sd, 0x04);
 136         int vol = cs5345_read(sd, 0x08) & 0x3f;
 137
 138         v4l2_info(sd, "Input:  %d%s\n", v,
 139                         (m & 0x80) ? " (muted)" : "");
 140         if (vol >= 32)
 141                 vol = vol - 64;
 142         v4l2_info(sd, "Volume: %d dB\n", vol);
 143         return 0;
 144 }
 145
 146 /* ----------------------------------------------------------------------- */
 147
 148 static const struct v4l2_subdev_core_ops cs5345_core_ops = {
 149         .log_status = cs5345_log_status,
 150         .g_chip_ident = cs5345_g_chip_ident,
 151         .g_ctrl = cs5345_g_ctrl,
 152         .s_ctrl = cs5345_s_ctrl,
 153 #ifdef CONFIG_VIDEO_ADV_DEBUG
 154         .g_register = cs5345_g_register,
 155         .s_register = cs5345_s_register,
 156 #endif
 157 };
 158
 159 static const struct v4l2_subdev_audio_ops cs5345_audio_ops = {
 160         .s_routing = cs5345_s_routing,
 161 };
 162
 163 static const struct v4l2_subdev_ops cs5345_ops = {
 164         .core = &cs5345_core_ops,
 165         .audio = &cs5345_audio_ops,
 166 };
 167
 168 /* ----------------------------------------------------------------------- */
 169
 170 static int cs5345_probe(struct i2c_client *client,
 171                         const struct i2c_device_id *id)
 172 {
 173         struct v4l2_subdev *sd;
 174
 175         /* Check if the adapter supports the needed features */
 176         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 177                 return -EIO;
 178
 179         v4l_info(client, "chip found @ 0x%x (%s)\n",
 180                         client->addr << 1, client->adapter->name);
 181
 182         sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
 183         if (sd == NULL)
 184                 return -ENOMEM;
 185         v4l2_i2c_subdev_init(sd, client, &cs5345_ops);
 186
 187         cs5345_write(sd, 0x02, 0x00);
 188         cs5345_write(sd, 0x04, 0x01);
 189         cs5345_write(sd, 0x09, 0x01);
 190         return 0;
 191 }
 192
 193 /* ----------------------------------------------------------------------- */
 194
 195 static int cs5345_remove(struct i2c_client *client)
 196 {
 197         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 198
 199         v4l2_device_unregister_subdev(sd);
 200         kfree(sd);
 201         return 0;
 202 }
 203
 204 /* ----------------------------------------------------------------------- */
 205
 206 static const struct i2c_device_id cs5345_id[] = {
 207         { "cs5345", 0 },
 208         { }
 209 };
 210 MODULE_DEVICE_TABLE(i2c, cs5345_id);
 211
 212 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 213         .name = "cs5345",
 214         .probe = cs5345_probe,
 215         .remove = cs5345_remove,
 216         .id_table = cs5345_id,
 217 };