linux/drivers/media/video/cs5345.c
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   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
  30MODULE_DESCRIPTION("i2c device driver for cs5345 Audio ADC");
  31MODULE_AUTHOR("Hans Verkuil");
  32MODULE_LICENSE("GPL");
  33
  34static int debug;
  35
  36module_param(debug, bool, 0644);
  37
  38MODULE_PARM_DESC(debug, "Debugging messages, 0=Off (default), 1=On");
  39
  40
  41/* ----------------------------------------------------------------------- */
  42
  43static 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
  50static 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
  57static 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
  69static 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
  83static 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
  99static 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
 112static 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
 125static 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
 132static 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
 148static 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
 159static const struct v4l2_subdev_audio_ops cs5345_audio_ops = {
 160        .s_routing = cs5345_s_routing,
 161};
 162
 163static const struct v4l2_subdev_ops cs5345_ops = {
 164        .core = &cs5345_core_ops,
 165        .audio = &cs5345_audio_ops,
 166};
 167
 168/* ----------------------------------------------------------------------- */
 169
 170static 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
 195static 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
 206static const struct i2c_device_id cs5345_id[] = {
 207        { "cs5345", 0 },
 208        { }
 209};
 210MODULE_DEVICE_TABLE(i2c, cs5345_id);
 211
 212static 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};
 218