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-ctrls.h>
  29
  30 MODULE_DESCRIPTION("i2c device driver for cs5345 Audio ADC");
  31 MODULE_AUTHOR("Hans Verkuil");
  32 MODULE_LICENSE("GPL");
  33
  34 static bool debug;
  35
  36 module_param(debug, bool, 0644);
  37
  38 MODULE_PARM_DESC(debug, "Debugging messages, 0=Off (default), 1=On");
  39
  40 struct cs5345_state {
  41         struct v4l2_subdev sd;
  42         struct v4l2_ctrl_handler hdl;
  43 };
  44
  45 static inline struct cs5345_state *to_state(struct v4l2_subdev *sd)
  46 {
  47         return container_of(sd, struct cs5345_state, sd);
  48 }
  49
  50 static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
  51 {
  52         return &container_of(ctrl->handler, struct cs5345_state, hdl)->sd;
  53 }
  54
  55 /* ----------------------------------------------------------------------- */
  56
  57 static inline int cs5345_write(struct v4l2_subdev *sd, u8 reg, u8 value)
  58 {
  59         struct i2c_client *client = v4l2_get_subdevdata(sd);
  60
  61         return i2c_smbus_write_byte_data(client, reg, value);
  62 }
  63
  64 static inline int cs5345_read(struct v4l2_subdev *sd, u8 reg)
  65 {
  66         struct i2c_client *client = v4l2_get_subdevdata(sd);
  67
  68         return i2c_smbus_read_byte_data(client, reg);
  69 }
  70
  71 static int cs5345_s_routing(struct v4l2_subdev *sd,
  72                             u32 input, u32 output, u32 config)
  73 {
  74         if ((input & 0xf) > 6) {
  75                 v4l2_err(sd, "Invalid input %d.\n", input);
  76                 return -EINVAL;
  77         }
  78         cs5345_write(sd, 0x09, input & 0xf);
  79         cs5345_write(sd, 0x05, input & 0xf0);
  80         return 0;
  81 }
  82
  83 static int cs5345_s_ctrl(struct v4l2_ctrl *ctrl)
  84 {
  85         struct v4l2_subdev *sd = to_sd(ctrl);
  86
  87         switch (ctrl->id) {
  88         case V4L2_CID_AUDIO_MUTE:
  89                 cs5345_write(sd, 0x04, ctrl->val ? 0x80 : 0);
  90                 return 0;
  91         case V4L2_CID_AUDIO_VOLUME:
  92                 cs5345_write(sd, 0x07, ((u8)ctrl->val) & 0x3f);
  93                 cs5345_write(sd, 0x08, ((u8)ctrl->val) & 0x3f);
  94                 return 0;
  95         }
  96         return -EINVAL;
  97 }
  98
  99 #ifdef CONFIG_VIDEO_ADV_DEBUG
 100 static int cs5345_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
 101 {
 102         struct i2c_client *client = v4l2_get_subdevdata(sd);
 103
 104         if (!v4l2_chip_match_i2c_client(client, &reg->match))
 105                 return -EINVAL;
 106         if (!capable(CAP_SYS_ADMIN))
 107                 return -EPERM;
 108         reg->size = 1;
 109         reg->val = cs5345_read(sd, reg->reg & 0x1f);
 110         return 0;
 111 }
 112
 113 static int cs5345_s_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
 114 {
 115         struct i2c_client *client = v4l2_get_subdevdata(sd);
 116
 117         if (!v4l2_chip_match_i2c_client(client, &reg->match))
 118                 return -EINVAL;
 119         if (!capable(CAP_SYS_ADMIN))
 120                 return -EPERM;
 121         cs5345_write(sd, reg->reg & 0x1f, reg->val & 0xff);
 122         return 0;
 123 }
 124 #endif
 125
 126 static int cs5345_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
 127 {
 128         struct i2c_client *client = v4l2_get_subdevdata(sd);
 129
 130         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_CS5345, 0);
 131 }
 132
 133 static int cs5345_log_status(struct v4l2_subdev *sd)
 134 {
 135         u8 v = cs5345_read(sd, 0x09) & 7;
 136         u8 m = cs5345_read(sd, 0x04);
 137         int vol = cs5345_read(sd, 0x08) & 0x3f;
 138
 139         v4l2_info(sd, "Input:  %d%s\n", v,
 140                         (m & 0x80) ? " (muted)" : "");
 141         if (vol >= 32)
 142                 vol = vol - 64;
 143         v4l2_info(sd, "Volume: %d dB\n", vol);
 144         return 0;
 145 }
 146
 147 /* ----------------------------------------------------------------------- */
 148
 149 static const struct v4l2_ctrl_ops cs5345_ctrl_ops = {
 150         .s_ctrl = cs5345_s_ctrl,
 151 };
 152
 153 static const struct v4l2_subdev_core_ops cs5345_core_ops = {
 154         .log_status = cs5345_log_status,
 155         .g_chip_ident = cs5345_g_chip_ident,
 156         .g_ext_ctrls = v4l2_subdev_g_ext_ctrls,
 157         .try_ext_ctrls = v4l2_subdev_try_ext_ctrls,
 158         .s_ext_ctrls = v4l2_subdev_s_ext_ctrls,
 159         .g_ctrl = v4l2_subdev_g_ctrl,
 160         .s_ctrl = v4l2_subdev_s_ctrl,
 161         .queryctrl = v4l2_subdev_queryctrl,
 162         .querymenu = v4l2_subdev_querymenu,
 163 #ifdef CONFIG_VIDEO_ADV_DEBUG
 164         .g_register = cs5345_g_register,
 165         .s_register = cs5345_s_register,
 166 #endif
 167 };
 168
 169 static const struct v4l2_subdev_audio_ops cs5345_audio_ops = {
 170         .s_routing = cs5345_s_routing,
 171 };
 172
 173 static const struct v4l2_subdev_ops cs5345_ops = {
 174         .core = &cs5345_core_ops,
 175         .audio = &cs5345_audio_ops,
 176 };
 177
 178 /* ----------------------------------------------------------------------- */
 179
 180 static int cs5345_probe(struct i2c_client *client,
 181                         const struct i2c_device_id *id)
 182 {
 183         struct cs5345_state *state;
 184         struct v4l2_subdev *sd;
 185
 186         /* Check if the adapter supports the needed features */
 187         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 188                 return -EIO;
 189
 190         v4l_info(client, "chip found @ 0x%x (%s)\n",
 191                         client->addr << 1, client->adapter->name);
 192
 193         state = kzalloc(sizeof(struct cs5345_state), GFP_KERNEL);
 194         if (state == NULL)
 195                 return -ENOMEM;
 196         sd = &state->sd;
 197         v4l2_i2c_subdev_init(sd, client, &cs5345_ops);
 198
 199         v4l2_ctrl_handler_init(&state->hdl, 2);
 200         v4l2_ctrl_new_std(&state->hdl, &cs5345_ctrl_ops,
 201                         V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);
 202         v4l2_ctrl_new_std(&state->hdl, &cs5345_ctrl_ops,
 203                         V4L2_CID_AUDIO_VOLUME, -24, 24, 1, 0);
 204         sd->ctrl_handler = &state->hdl;
 205         if (state->hdl.error) {
 206                 int err = state->hdl.error;
 207
 208                 v4l2_ctrl_handler_free(&state->hdl);
 209                 kfree(state);
 210                 return err;
 211         }
 212         /* set volume/mute */
 213         v4l2_ctrl_handler_setup(&state->hdl);
 214
 215         cs5345_write(sd, 0x02, 0x00);
 216         cs5345_write(sd, 0x04, 0x01);
 217         cs5345_write(sd, 0x09, 0x01);
 218         return 0;
 219 }
 220
 221 /* ----------------------------------------------------------------------- */
 222
 223 static int cs5345_remove(struct i2c_client *client)
 224 {
 225         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 226         struct cs5345_state *state = to_state(sd);
 227
 228         v4l2_device_unregister_subdev(sd);
 229         v4l2_ctrl_handler_free(&state->hdl);
 230         kfree(state);
 231         return 0;
 232 }
 233
 234 /* ----------------------------------------------------------------------- */
 235
 236 static const struct i2c_device_id cs5345_id[] = {
 237         { "cs5345", 0 },
 238         { }
 239 };
 240 MODULE_DEVICE_TABLE(i2c, cs5345_id);
 241
 242 static struct i2c_driver cs5345_driver = {
 243         .driver = {
 244                 .owner  = THIS_MODULE,
 245                 .name   = "cs5345",
 246         },
 247         .probe          = cs5345_probe,
 248         .remove         = cs5345_remove,
 249         .id_table       = cs5345_id,
 250 };
 251
 252 static __init int init_cs5345(void)
 253 {
 254         return i2c_add_driver(&cs5345_driver);
 255 }
 256
 257 static __exit void exit_cs5345(void)
 258 {
 259         i2c_del_driver(&cs5345_driver);
 260 }
 261
 262 module_init(init_cs5345);
 263 module_exit(exit_cs5345);