root/drivers/media/i2c/vp27smpx.c

DEFINITIONS

1. to_state
2. vp27smpx_set_audmode
3. vp27smpx_s_radio
4. vp27smpx_s_std
5. vp27smpx_s_tuner
6. vp27smpx_g_tuner
7. vp27smpx_log_status
8. vp27smpx_probe
9. vp27smpx_remove

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * vp27smpx - driver version 0.0.1
   4  *
   5  * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
   6  *
   7  * Based on a tvaudio patch from Takahiro Adachi <tadachi@tadachi-net.com>
   8  * and Kazuhiko Kawakami <kazz-0@mail.goo.ne.jp>
   9  */
  10 
  11 #include <linux/module.h>
  12 #include <linux/types.h>
  13 #include <linux/slab.h>
  14 #include <linux/ioctl.h>
  15 #include <linux/uaccess.h>
  16 #include <linux/i2c.h>
  17 #include <linux/videodev2.h>
  18 #include <media/v4l2-device.h>
  19 
  20 MODULE_DESCRIPTION("vp27smpx driver");
  21 MODULE_AUTHOR("Hans Verkuil");
  22 MODULE_LICENSE("GPL");
  23 
  24 
  25 /* ----------------------------------------------------------------------- */
  26 
  27 struct vp27smpx_state {
  28         struct v4l2_subdev sd;
  29         int radio;
  30         u32 audmode;
  31 };
  32 
  33 static inline struct vp27smpx_state *to_state(struct v4l2_subdev *sd)
  34 {
  35         return container_of(sd, struct vp27smpx_state, sd);
  36 }
  37 
  38 static void vp27smpx_set_audmode(struct v4l2_subdev *sd, u32 audmode)
  39 {
  40         struct vp27smpx_state *state = to_state(sd);
  41         struct i2c_client *client = v4l2_get_subdevdata(sd);
  42         u8 data[3] = { 0x00, 0x00, 0x04 };
  43 
  44         switch (audmode) {
  45         case V4L2_TUNER_MODE_MONO:
  46         case V4L2_TUNER_MODE_LANG1:
  47                 break;
  48         case V4L2_TUNER_MODE_STEREO:
  49         case V4L2_TUNER_MODE_LANG1_LANG2:
  50                 data[1] = 0x01;
  51                 break;
  52         case V4L2_TUNER_MODE_LANG2:
  53                 data[1] = 0x02;
  54                 break;
  55         }
  56 
  57         if (i2c_master_send(client, data, sizeof(data)) != sizeof(data))
  58                 v4l2_err(sd, "I/O error setting audmode\n");
  59         else
  60                 state->audmode = audmode;
  61 }
  62 
  63 static int vp27smpx_s_radio(struct v4l2_subdev *sd)
  64 {
  65         struct vp27smpx_state *state = to_state(sd);
  66 
  67         state->radio = 1;
  68         return 0;
  69 }
  70 
  71 static int vp27smpx_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
  72 {
  73         struct vp27smpx_state *state = to_state(sd);
  74 
  75         state->radio = 0;
  76         return 0;
  77 }
  78 
  79 static int vp27smpx_s_tuner(struct v4l2_subdev *sd, const struct v4l2_tuner *vt)
  80 {
  81         struct vp27smpx_state *state = to_state(sd);
  82 
  83         if (!state->radio)
  84                 vp27smpx_set_audmode(sd, vt->audmode);
  85         return 0;
  86 }
  87 
  88 static int vp27smpx_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
  89 {
  90         struct vp27smpx_state *state = to_state(sd);
  91 
  92         if (state->radio)
  93                 return 0;
  94         vt->audmode = state->audmode;
  95         vt->capability = V4L2_TUNER_CAP_STEREO |
  96                 V4L2_TUNER_CAP_LANG1 | V4L2_TUNER_CAP_LANG2;
  97         vt->rxsubchans = V4L2_TUNER_SUB_MONO;
  98         return 0;
  99 }
 100 
 101 static int vp27smpx_log_status(struct v4l2_subdev *sd)
 102 {
 103         struct vp27smpx_state *state = to_state(sd);
 104 
 105         v4l2_info(sd, "Audio Mode: %u%s\n", state->audmode,
 106                         state->radio ? " (Radio)" : "");
 107         return 0;
 108 }
 109 
 110 /* ----------------------------------------------------------------------- */
 111 
 112 static const struct v4l2_subdev_core_ops vp27smpx_core_ops = {
 113         .log_status = vp27smpx_log_status,
 114 };
 115 
 116 static const struct v4l2_subdev_tuner_ops vp27smpx_tuner_ops = {
 117         .s_radio = vp27smpx_s_radio,
 118         .s_tuner = vp27smpx_s_tuner,
 119         .g_tuner = vp27smpx_g_tuner,
 120 };
 121 
 122 static const struct v4l2_subdev_video_ops vp27smpx_video_ops = {
 123         .s_std = vp27smpx_s_std,
 124 };
 125 
 126 static const struct v4l2_subdev_ops vp27smpx_ops = {
 127         .core = &vp27smpx_core_ops,
 128         .tuner = &vp27smpx_tuner_ops,
 129         .video = &vp27smpx_video_ops,
 130 };
 131 
 132 /* ----------------------------------------------------------------------- */
 133 
 134 /* i2c implementation */
 135 
 136 /*
 137  * Generic i2c probe
 138  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 139  */
 140 
 141 static int vp27smpx_probe(struct i2c_client *client,
 142                           const struct i2c_device_id *id)
 143 {
 144         struct vp27smpx_state *state;
 145         struct v4l2_subdev *sd;
 146 
 147         /* Check if the adapter supports the needed features */
 148         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 149                 return -EIO;
 150 
 151         v4l_info(client, "chip found @ 0x%x (%s)\n",
 152                         client->addr << 1, client->adapter->name);
 153 
 154         state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
 155         if (state == NULL)
 156                 return -ENOMEM;
 157         sd = &state->sd;
 158         v4l2_i2c_subdev_init(sd, client, &vp27smpx_ops);
 159         state->audmode = V4L2_TUNER_MODE_STEREO;
 160 
 161         /* initialize vp27smpx */
 162         vp27smpx_set_audmode(sd, state->audmode);
 163         return 0;
 164 }
 165 
 166 static int vp27smpx_remove(struct i2c_client *client)
 167 {
 168         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 169 
 170         v4l2_device_unregister_subdev(sd);
 171         return 0;
 172 }
 173 
 174 /* ----------------------------------------------------------------------- */
 175 
 176 static const struct i2c_device_id vp27smpx_id[] = {
 177         { "vp27smpx", 0 },
 178         { }
 179 };
 180 MODULE_DEVICE_TABLE(i2c, vp27smpx_id);
 181 
 182 static struct i2c_driver vp27smpx_driver = {
 183         .driver = {
 184                 .name   = "vp27smpx",
 185         },
 186         .probe          = vp27smpx_probe,
 187         .remove         = vp27smpx_remove,
 188         .id_table       = vp27smpx_id,
 189 };
 190 
 191 module_i2c_driver(vp27smpx_driver);