drivers/media/i2c/cs53l32a.c

   1 /*
   2  * cs53l32a (Adaptec AVC-2010 and AVC-2410) i2c ivtv driver.
   3  * Copyright (C) 2005  Martin Vaughan
   4  *
   5  * Audio source switching for Adaptec AVC-2410 added by Trev Jackson
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22
  23 #include <linux/module.h>
  24 #include <linux/types.h>
  25 #include <linux/slab.h>
  26 #include <linux/ioctl.h>
  27 #include <asm/uaccess.h>
  28 #include <linux/i2c.h>
  29 #include <linux/videodev2.h>
  30 #include <media/v4l2-device.h>
  31 #include <media/v4l2-ctrls.h>
  32
  33 MODULE_DESCRIPTION("i2c device driver for cs53l32a Audio ADC");
  34 MODULE_AUTHOR("Martin Vaughan");
  35 MODULE_LICENSE("GPL");
  36
  37 static bool debug;
  38
  39 module_param(debug, bool, 0644);
  40
  41 MODULE_PARM_DESC(debug, "Debugging messages, 0=Off (default), 1=On");
  42
  43
  44 struct cs53l32a_state {
  45         struct v4l2_subdev sd;
  46         struct v4l2_ctrl_handler hdl;
  47 };
  48
  49 static inline struct cs53l32a_state *to_state(struct v4l2_subdev *sd)
  50 {
  51         return container_of(sd, struct cs53l32a_state, sd);
  52 }
  53
  54 static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
  55 {
  56         return &container_of(ctrl->handler, struct cs53l32a_state, hdl)->sd;
  57 }
  58
  59 /* ----------------------------------------------------------------------- */
  60
  61 static int cs53l32a_write(struct v4l2_subdev *sd, u8 reg, u8 value)
  62 {
  63         struct i2c_client *client = v4l2_get_subdevdata(sd);
  64
  65         return i2c_smbus_write_byte_data(client, reg, value);
  66 }
  67
  68 static int cs53l32a_read(struct v4l2_subdev *sd, u8 reg)
  69 {
  70         struct i2c_client *client = v4l2_get_subdevdata(sd);
  71
  72         return i2c_smbus_read_byte_data(client, reg);
  73 }
  74
  75 static int cs53l32a_s_routing(struct v4l2_subdev *sd,
  76                               u32 input, u32 output, u32 config)
  77 {
  78         /* There are 2 physical inputs, but the second input can be
  79            placed in two modes, the first mode bypasses the PGA (gain),
  80            the second goes through the PGA. Hence there are three
  81            possible inputs to choose from. */
  82         if (input > 2) {
  83                 v4l2_err(sd, "Invalid input %d.\n", input);
  84                 return -EINVAL;
  85         }
  86         cs53l32a_write(sd, 0x01, 0x01 + (input << 4));
  87         return 0;
  88 }
  89
  90 static int cs53l32a_s_ctrl(struct v4l2_ctrl *ctrl)
  91 {
  92         struct v4l2_subdev *sd = to_sd(ctrl);
  93
  94         switch (ctrl->id) {
  95         case V4L2_CID_AUDIO_MUTE:
  96                 cs53l32a_write(sd, 0x03, ctrl->val ? 0xf0 : 0x30);
  97                 return 0;
  98         case V4L2_CID_AUDIO_VOLUME:
  99                 cs53l32a_write(sd, 0x04, (u8)ctrl->val);
 100                 cs53l32a_write(sd, 0x05, (u8)ctrl->val);
 101                 return 0;
 102         }
 103         return -EINVAL;
 104 }
 105
 106 static int cs53l32a_log_status(struct v4l2_subdev *sd)
 107 {
 108         struct cs53l32a_state *state = to_state(sd);
 109         u8 v = cs53l32a_read(sd, 0x01);
 110
 111         v4l2_info(sd, "Input:  %d\n", (v >> 4) & 3);
 112         v4l2_ctrl_handler_log_status(&state->hdl, sd->name);
 113         return 0;
 114 }
 115
 116 /* ----------------------------------------------------------------------- */
 117
 118 static const struct v4l2_ctrl_ops cs53l32a_ctrl_ops = {
 119         .s_ctrl = cs53l32a_s_ctrl,
 120 };
 121
 122 static const struct v4l2_subdev_core_ops cs53l32a_core_ops = {
 123         .log_status = cs53l32a_log_status,
 124 };
 125
 126 static const struct v4l2_subdev_audio_ops cs53l32a_audio_ops = {
 127         .s_routing = cs53l32a_s_routing,
 128 };
 129
 130 static const struct v4l2_subdev_ops cs53l32a_ops = {
 131         .core = &cs53l32a_core_ops,
 132         .audio = &cs53l32a_audio_ops,
 133 };
 134
 135 /* ----------------------------------------------------------------------- */
 136
 137 /* i2c implementation */
 138
 139 /*
 140  * Generic i2c probe
 141  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 142  */
 143
 144 static int cs53l32a_probe(struct i2c_client *client,
 145                           const struct i2c_device_id *id)
 146 {
 147         struct cs53l32a_state *state;
 148         struct v4l2_subdev *sd;
 149         int i;
 150
 151         /* Check if the adapter supports the needed features */
 152         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 153                 return -EIO;
 154
 155         if (!id)
 156                 strlcpy(client->name, "cs53l32a", sizeof(client->name));
 157
 158         v4l_info(client, "chip found @ 0x%x (%s)\n",
 159                         client->addr << 1, client->adapter->name);
 160
 161         state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
 162         if (state == NULL)
 163                 return -ENOMEM;
 164         sd = &state->sd;
 165         v4l2_i2c_subdev_init(sd, client, &cs53l32a_ops);
 166
 167         for (i = 1; i <= 7; i++) {
 168                 u8 v = cs53l32a_read(sd, i);
 169
 170                 v4l2_dbg(1, debug, sd, "Read Reg %d %02x\n", i, v);
 171         }
 172
 173         v4l2_ctrl_handler_init(&state->hdl, 2);
 174         v4l2_ctrl_new_std(&state->hdl, &cs53l32a_ctrl_ops,
 175                         V4L2_CID_AUDIO_VOLUME, -96, 12, 1, 0);
 176         v4l2_ctrl_new_std(&state->hdl, &cs53l32a_ctrl_ops,
 177                         V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);
 178         sd->ctrl_handler = &state->hdl;
 179         if (state->hdl.error) {
 180                 int err = state->hdl.error;
 181
 182                 v4l2_ctrl_handler_free(&state->hdl);
 183                 return err;
 184         }
 185
 186         /* Set cs53l32a internal register for Adaptec 2010/2410 setup */
 187
 188         cs53l32a_write(sd, 0x01, 0x21);
 189         cs53l32a_write(sd, 0x02, 0x29);
 190         cs53l32a_write(sd, 0x03, 0x30);
 191         cs53l32a_write(sd, 0x04, 0x00);
 192         cs53l32a_write(sd, 0x05, 0x00);
 193         cs53l32a_write(sd, 0x06, 0x00);
 194         cs53l32a_write(sd, 0x07, 0x00);
 195
 196         /* Display results, should be 0x21,0x29,0x30,0x00,0x00,0x00,0x00 */
 197
 198         for (i = 1; i <= 7; i++) {
 199                 u8 v = cs53l32a_read(sd, i);
 200
 201                 v4l2_dbg(1, debug, sd, "Read Reg %d %02x\n", i, v);
 202         }
 203         return 0;
 204 }
 205
 206 static int cs53l32a_remove(struct i2c_client *client)
 207 {
 208         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 209         struct cs53l32a_state *state = to_state(sd);
 210
 211         v4l2_device_unregister_subdev(sd);
 212         v4l2_ctrl_handler_free(&state->hdl);
 213         return 0;
 214 }
 215
 216 static const struct i2c_device_id cs53l32a_id[] = {
 217         { "cs53l32a", 0 },
 218         { }
 219 };
 220 MODULE_DEVICE_TABLE(i2c, cs53l32a_id);
 221
 222 static struct i2c_driver cs53l32a_driver = {
 223         .driver = {
 224                 .name   = "cs53l32a",
 225         },
 226         .probe          = cs53l32a_probe,
 227         .remove         = cs53l32a_remove,
 228         .id_table       = cs53l32a_id,
 229 };
 230
 231 module_i2c_driver(cs53l32a_driver);