root/drivers/media/i2c/tlv320aic23b.c

DEFINITIONS

1. to_state
2. to_sd
3. tlv320aic23b_write
4. tlv320aic23b_s_clock_freq
5. tlv320aic23b_s_ctrl
6. tlv320aic23b_log_status
7. tlv320aic23b_probe
8. tlv320aic23b_remove

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * tlv320aic23b - driver version 0.0.1
   4  *
   5  * Copyright (C) 2006 Scott Alfter <salfter@ssai.us>
   6  *
   7  * Based on wm8775 driver
   8  *
   9  * Copyright (C) 2004 Ulf Eklund <ivtv at eklund.to>
  10  * Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
  11  */
  12 
  13 #include <linux/module.h>
  14 #include <linux/types.h>
  15 #include <linux/slab.h>
  16 #include <linux/ioctl.h>
  17 #include <linux/uaccess.h>
  18 #include <linux/i2c.h>
  19 #include <linux/videodev2.h>
  20 #include <media/v4l2-device.h>
  21 #include <media/v4l2-ctrls.h>
  22 
  23 MODULE_DESCRIPTION("tlv320aic23b driver");
  24 MODULE_AUTHOR("Scott Alfter, Ulf Eklund, Hans Verkuil");
  25 MODULE_LICENSE("GPL");
  26 
  27 
  28 /* ----------------------------------------------------------------------- */
  29 
  30 struct tlv320aic23b_state {
  31         struct v4l2_subdev sd;
  32         struct v4l2_ctrl_handler hdl;
  33 };
  34 
  35 static inline struct tlv320aic23b_state *to_state(struct v4l2_subdev *sd)
  36 {
  37         return container_of(sd, struct tlv320aic23b_state, sd);
  38 }
  39 
  40 static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
  41 {
  42         return &container_of(ctrl->handler, struct tlv320aic23b_state, hdl)->sd;
  43 }
  44 
  45 static int tlv320aic23b_write(struct v4l2_subdev *sd, int reg, u16 val)
  46 {
  47         struct i2c_client *client = v4l2_get_subdevdata(sd);
  48         int i;
  49 
  50         if ((reg < 0 || reg > 9) && (reg != 15)) {
  51                 v4l2_err(sd, "Invalid register R%d\n", reg);
  52                 return -1;
  53         }
  54 
  55         for (i = 0; i < 3; i++)
  56                 if (i2c_smbus_write_byte_data(client,
  57                                 (reg << 1) | (val >> 8), val & 0xff) == 0)
  58                         return 0;
  59         v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
  60         return -1;
  61 }
  62 
  63 static int tlv320aic23b_s_clock_freq(struct v4l2_subdev *sd, u32 freq)
  64 {
  65         switch (freq) {
  66         case 32000: /* set sample rate to 32 kHz */
  67                 tlv320aic23b_write(sd, 8, 0x018);
  68                 break;
  69         case 44100: /* set sample rate to 44.1 kHz */
  70                 tlv320aic23b_write(sd, 8, 0x022);
  71                 break;
  72         case 48000: /* set sample rate to 48 kHz */
  73                 tlv320aic23b_write(sd, 8, 0x000);
  74                 break;
  75         default:
  76                 return -EINVAL;
  77         }
  78         return 0;
  79 }
  80 
  81 static int tlv320aic23b_s_ctrl(struct v4l2_ctrl *ctrl)
  82 {
  83         struct v4l2_subdev *sd = to_sd(ctrl);
  84 
  85         switch (ctrl->id) {
  86         case V4L2_CID_AUDIO_MUTE:
  87                 tlv320aic23b_write(sd, 0, 0x180); /* mute both channels */
  88                 /* set gain on both channels to +3.0 dB */
  89                 if (!ctrl->val)
  90                         tlv320aic23b_write(sd, 0, 0x119);
  91                 return 0;
  92         }
  93         return -EINVAL;
  94 }
  95 
  96 static int tlv320aic23b_log_status(struct v4l2_subdev *sd)
  97 {
  98         struct tlv320aic23b_state *state = to_state(sd);
  99 
 100         v4l2_ctrl_handler_log_status(&state->hdl, sd->name);
 101         return 0;
 102 }
 103 
 104 /* ----------------------------------------------------------------------- */
 105 
 106 static const struct v4l2_ctrl_ops tlv320aic23b_ctrl_ops = {
 107         .s_ctrl = tlv320aic23b_s_ctrl,
 108 };
 109 
 110 static const struct v4l2_subdev_core_ops tlv320aic23b_core_ops = {
 111         .log_status = tlv320aic23b_log_status,
 112 };
 113 
 114 static const struct v4l2_subdev_audio_ops tlv320aic23b_audio_ops = {
 115         .s_clock_freq = tlv320aic23b_s_clock_freq,
 116 };
 117 
 118 static const struct v4l2_subdev_ops tlv320aic23b_ops = {
 119         .core = &tlv320aic23b_core_ops,
 120         .audio = &tlv320aic23b_audio_ops,
 121 };
 122 
 123 /* ----------------------------------------------------------------------- */
 124 
 125 /* i2c implementation */
 126 
 127 /*
 128  * Generic i2c probe
 129  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 130  */
 131 
 132 static int tlv320aic23b_probe(struct i2c_client *client,
 133                               const struct i2c_device_id *id)
 134 {
 135         struct tlv320aic23b_state *state;
 136         struct v4l2_subdev *sd;
 137 
 138         /* Check if the adapter supports the needed features */
 139         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 140                 return -EIO;
 141 
 142         v4l_info(client, "chip found @ 0x%x (%s)\n",
 143                         client->addr << 1, client->adapter->name);
 144 
 145         state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
 146         if (state == NULL)
 147                 return -ENOMEM;
 148         sd = &state->sd;
 149         v4l2_i2c_subdev_init(sd, client, &tlv320aic23b_ops);
 150 
 151         /* Initialize tlv320aic23b */
 152 
 153         /* RESET */
 154         tlv320aic23b_write(sd, 15, 0x000);
 155         /* turn off DAC & mic input */
 156         tlv320aic23b_write(sd, 6, 0x00A);
 157         /* left-justified, 24-bit, master mode */
 158         tlv320aic23b_write(sd, 7, 0x049);
 159         /* set gain on both channels to +3.0 dB */
 160         tlv320aic23b_write(sd, 0, 0x119);
 161         /* set sample rate to 48 kHz */
 162         tlv320aic23b_write(sd, 8, 0x000);
 163         /* activate digital interface */
 164         tlv320aic23b_write(sd, 9, 0x001);
 165 
 166         v4l2_ctrl_handler_init(&state->hdl, 1);
 167         v4l2_ctrl_new_std(&state->hdl, &tlv320aic23b_ctrl_ops,
 168                         V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);
 169         sd->ctrl_handler = &state->hdl;
 170         if (state->hdl.error) {
 171                 int err = state->hdl.error;
 172 
 173                 v4l2_ctrl_handler_free(&state->hdl);
 174                 return err;
 175         }
 176         v4l2_ctrl_handler_setup(&state->hdl);
 177         return 0;
 178 }
 179 
 180 static int tlv320aic23b_remove(struct i2c_client *client)
 181 {
 182         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 183         struct tlv320aic23b_state *state = to_state(sd);
 184 
 185         v4l2_device_unregister_subdev(sd);
 186         v4l2_ctrl_handler_free(&state->hdl);
 187         return 0;
 188 }
 189 
 190 /* ----------------------------------------------------------------------- */
 191 
 192 static const struct i2c_device_id tlv320aic23b_id[] = {
 193         { "tlv320aic23b", 0 },
 194         { }
 195 };
 196 MODULE_DEVICE_TABLE(i2c, tlv320aic23b_id);
 197 
 198 static struct i2c_driver tlv320aic23b_driver = {
 199         .driver = {
 200                 .name   = "tlv320aic23b",
 201         },
 202         .probe          = tlv320aic23b_probe,
 203         .remove         = tlv320aic23b_remove,
 204         .id_table       = tlv320aic23b_id,
 205 };
 206 
 207 module_i2c_driver(tlv320aic23b_driver);