drivers/media/i2c/vp27smpx.c

   1 /*
   2  * vp27smpx - driver version 0.0.1
   3  *
   4  * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
   5  *
   6  * Based on a tvaudio patch from Takahiro Adachi <tadachi@tadachi-net.com>
   7  * and Kazuhiko Kawakami <kazz-0@mail.goo.ne.jp>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/types.h>
  22 #include <linux/slab.h>
  23 #include <linux/ioctl.h>
  24 #include <linux/uaccess.h>
  25 #include <linux/i2c.h>
  26 #include <linux/videodev2.h>
  27 #include <media/v4l2-device.h>
  28
  29 MODULE_DESCRIPTION("vp27smpx driver");
  30 MODULE_AUTHOR("Hans Verkuil");
  31 MODULE_LICENSE("GPL");
  32
  33
  34 /* ----------------------------------------------------------------------- */
  35
  36 struct vp27smpx_state {
  37         struct v4l2_subdev sd;
  38         int radio;
  39         u32 audmode;
  40 };
  41
  42 static inline struct vp27smpx_state *to_state(struct v4l2_subdev *sd)
  43 {
  44         return container_of(sd, struct vp27smpx_state, sd);
  45 }
  46
  47 static void vp27smpx_set_audmode(struct v4l2_subdev *sd, u32 audmode)
  48 {
  49         struct vp27smpx_state *state = to_state(sd);
  50         struct i2c_client *client = v4l2_get_subdevdata(sd);
  51         u8 data[3] = { 0x00, 0x00, 0x04 };
  52
  53         switch (audmode) {
  54         case V4L2_TUNER_MODE_MONO:
  55         case V4L2_TUNER_MODE_LANG1:
  56                 break;
  57         case V4L2_TUNER_MODE_STEREO:
  58         case V4L2_TUNER_MODE_LANG1_LANG2:
  59                 data[1] = 0x01;
  60                 break;
  61         case V4L2_TUNER_MODE_LANG2:
  62                 data[1] = 0x02;
  63                 break;
  64         }
  65
  66         if (i2c_master_send(client, data, sizeof(data)) != sizeof(data))
  67                 v4l2_err(sd, "I/O error setting audmode\n");
  68         else
  69                 state->audmode = audmode;
  70 }
  71
  72 static int vp27smpx_s_radio(struct v4l2_subdev *sd)
  73 {
  74         struct vp27smpx_state *state = to_state(sd);
  75
  76         state->radio = 1;
  77         return 0;
  78 }
  79
  80 static int vp27smpx_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
  81 {
  82         struct vp27smpx_state *state = to_state(sd);
  83
  84         state->radio = 0;
  85         return 0;
  86 }
  87
  88 static int vp27smpx_s_tuner(struct v4l2_subdev *sd, const struct v4l2_tuner *vt)
  89 {
  90         struct vp27smpx_state *state = to_state(sd);
  91
  92         if (!state->radio)
  93                 vp27smpx_set_audmode(sd, vt->audmode);
  94         return 0;
  95 }
  96
  97 static int vp27smpx_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
  98 {
  99         struct vp27smpx_state *state = to_state(sd);
 100
 101         if (state->radio)
 102                 return 0;
 103         vt->audmode = state->audmode;
 104         vt->capability = V4L2_TUNER_CAP_STEREO |
 105                 V4L2_TUNER_CAP_LANG1 | V4L2_TUNER_CAP_LANG2;
 106         vt->rxsubchans = V4L2_TUNER_SUB_MONO;
 107         return 0;
 108 }
 109
 110 static int vp27smpx_log_status(struct v4l2_subdev *sd)
 111 {
 112         struct vp27smpx_state *state = to_state(sd);
 113
 114         v4l2_info(sd, "Audio Mode: %u%s\n", state->audmode,
 115                         state->radio ? " (Radio)" : "");
 116         return 0;
 117 }
 118
 119 /* ----------------------------------------------------------------------- */
 120
 121 static const struct v4l2_subdev_core_ops vp27smpx_core_ops = {
 122         .log_status = vp27smpx_log_status,
 123 };
 124
 125 static const struct v4l2_subdev_tuner_ops vp27smpx_tuner_ops = {
 126         .s_radio = vp27smpx_s_radio,
 127         .s_tuner = vp27smpx_s_tuner,
 128         .g_tuner = vp27smpx_g_tuner,
 129 };
 130
 131 static const struct v4l2_subdev_video_ops vp27smpx_video_ops = {
 132         .s_std = vp27smpx_s_std,
 133 };
 134
 135 static const struct v4l2_subdev_ops vp27smpx_ops = {
 136         .core = &vp27smpx_core_ops,
 137         .tuner = &vp27smpx_tuner_ops,
 138         .video = &vp27smpx_video_ops,
 139 };
 140
 141 /* ----------------------------------------------------------------------- */
 142
 143 /* i2c implementation */
 144
 145 /*
 146  * Generic i2c probe
 147  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 148  */
 149
 150 static int vp27smpx_probe(struct i2c_client *client,
 151                           const struct i2c_device_id *id)
 152 {
 153         struct vp27smpx_state *state;
 154         struct v4l2_subdev *sd;
 155
 156         /* Check if the adapter supports the needed features */
 157         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 158                 return -EIO;
 159
 160         v4l_info(client, "chip found @ 0x%x (%s)\n",
 161                         client->addr << 1, client->adapter->name);
 162
 163         state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
 164         if (state == NULL)
 165                 return -ENOMEM;
 166         sd = &state->sd;
 167         v4l2_i2c_subdev_init(sd, client, &vp27smpx_ops);
 168         state->audmode = V4L2_TUNER_MODE_STEREO;
 169
 170         /* initialize vp27smpx */
 171         vp27smpx_set_audmode(sd, state->audmode);
 172         return 0;
 173 }
 174
 175 static int vp27smpx_remove(struct i2c_client *client)
 176 {
 177         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 178
 179         v4l2_device_unregister_subdev(sd);
 180         return 0;
 181 }
 182
 183 /* ----------------------------------------------------------------------- */
 184
 185 static const struct i2c_device_id vp27smpx_id[] = {
 186         { "vp27smpx", 0 },
 187         { }
 188 };
 189 MODULE_DEVICE_TABLE(i2c, vp27smpx_id);
 190
 191 static struct i2c_driver vp27smpx_driver = {
 192         .driver = {
 193                 .name   = "vp27smpx",
 194         },
 195         .probe          = vp27smpx_probe,
 196         .remove         = vp27smpx_remove,
 197         .id_table       = vp27smpx_id,
 198 };
 199
 200 module_i2c_driver(vp27smpx_driver);