kernel/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  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24 #include <linux/module.h>
  25 #include <linux/types.h>
  26 #include <linux/slab.h>
  27 #include <linux/ioctl.h>
  28 #include <asm/uaccess.h>
  29 #include <linux/i2c.h>
  30 #include <linux/videodev2.h>
  31 #include <media/v4l2-device.h>
  32
  33 MODULE_DESCRIPTION("vp27smpx driver");
  34 MODULE_AUTHOR("Hans Verkuil");
  35 MODULE_LICENSE("GPL");
  36
  37
  38 /* ----------------------------------------------------------------------- */
  39
  40 struct vp27smpx_state {
  41         struct v4l2_subdev sd;
  42         int radio;
  43         u32 audmode;
  44 };
  45
  46 static inline struct vp27smpx_state *to_state(struct v4l2_subdev *sd)
  47 {
  48         return container_of(sd, struct vp27smpx_state, sd);
  49 }
  50
  51 static void vp27smpx_set_audmode(struct v4l2_subdev *sd, u32 audmode)
  52 {
  53         struct vp27smpx_state *state = to_state(sd);
  54         struct i2c_client *client = v4l2_get_subdevdata(sd);
  55         u8 data[3] = { 0x00, 0x00, 0x04 };
  56
  57         switch (audmode) {
  58         case V4L2_TUNER_MODE_MONO:
  59         case V4L2_TUNER_MODE_LANG1:
  60                 break;
  61         case V4L2_TUNER_MODE_STEREO:
  62         case V4L2_TUNER_MODE_LANG1_LANG2:
  63                 data[1] = 0x01;
  64                 break;
  65         case V4L2_TUNER_MODE_LANG2:
  66                 data[1] = 0x02;
  67                 break;
  68         }
  69
  70         if (i2c_master_send(client, data, sizeof(data)) != sizeof(data))
  71                 v4l2_err(sd, "I/O error setting audmode\n");
  72         else
  73                 state->audmode = audmode;
  74 }
  75
  76 static int vp27smpx_s_radio(struct v4l2_subdev *sd)
  77 {
  78         struct vp27smpx_state *state = to_state(sd);
  79
  80         state->radio = 1;
  81         return 0;
  82 }
  83
  84 static int vp27smpx_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
  85 {
  86         struct vp27smpx_state *state = to_state(sd);
  87
  88         state->radio = 0;
  89         return 0;
  90 }
  91
  92 static int vp27smpx_s_tuner(struct v4l2_subdev *sd, const struct v4l2_tuner *vt)
  93 {
  94         struct vp27smpx_state *state = to_state(sd);
  95
  96         if (!state->radio)
  97                 vp27smpx_set_audmode(sd, vt->audmode);
  98         return 0;
  99 }
 100
 101 static int vp27smpx_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
 102 {
 103         struct vp27smpx_state *state = to_state(sd);
 104
 105         if (state->radio)
 106                 return 0;
 107         vt->audmode = state->audmode;
 108         vt->capability = V4L2_TUNER_CAP_STEREO |
 109                 V4L2_TUNER_CAP_LANG1 | V4L2_TUNER_CAP_LANG2;
 110         vt->rxsubchans = V4L2_TUNER_SUB_MONO;
 111         return 0;
 112 }
 113
 114 static int vp27smpx_log_status(struct v4l2_subdev *sd)
 115 {
 116         struct vp27smpx_state *state = to_state(sd);
 117
 118         v4l2_info(sd, "Audio Mode: %u%s\n", state->audmode,
 119                         state->radio ? " (Radio)" : "");
 120         return 0;
 121 }
 122
 123 /* ----------------------------------------------------------------------- */
 124
 125 static const struct v4l2_subdev_core_ops vp27smpx_core_ops = {
 126         .log_status = vp27smpx_log_status,
 127 };
 128
 129 static const struct v4l2_subdev_tuner_ops vp27smpx_tuner_ops = {
 130         .s_radio = vp27smpx_s_radio,
 131         .s_tuner = vp27smpx_s_tuner,
 132         .g_tuner = vp27smpx_g_tuner,
 133 };
 134
 135 static const struct v4l2_subdev_video_ops vp27smpx_video_ops = {
 136         .s_std = vp27smpx_s_std,
 137 };
 138
 139 static const struct v4l2_subdev_ops vp27smpx_ops = {
 140         .core = &vp27smpx_core_ops,
 141         .tuner = &vp27smpx_tuner_ops,
 142         .video = &vp27smpx_video_ops,
 143 };
 144
 145 /* ----------------------------------------------------------------------- */
 146
 147 /* i2c implementation */
 148
 149 /*
 150  * Generic i2c probe
 151  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 152  */
 153
 154 static int vp27smpx_probe(struct i2c_client *client,
 155                           const struct i2c_device_id *id)
 156 {
 157         struct vp27smpx_state *state;
 158         struct v4l2_subdev *sd;
 159
 160         /* Check if the adapter supports the needed features */
 161         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 162                 return -EIO;
 163
 164         v4l_info(client, "chip found @ 0x%x (%s)\n",
 165                         client->addr << 1, client->adapter->name);
 166
 167         state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
 168         if (state == NULL)
 169                 return -ENOMEM;
 170         sd = &state->sd;
 171         v4l2_i2c_subdev_init(sd, client, &vp27smpx_ops);
 172         state->audmode = V4L2_TUNER_MODE_STEREO;
 173
 174         /* initialize vp27smpx */
 175         vp27smpx_set_audmode(sd, state->audmode);
 176         return 0;
 177 }
 178
 179 static int vp27smpx_remove(struct i2c_client *client)
 180 {
 181         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 182
 183         v4l2_device_unregister_subdev(sd);
 184         return 0;
 185 }
 186
 187 /* ----------------------------------------------------------------------- */
 188
 189 static const struct i2c_device_id vp27smpx_id[] = {
 190         { "vp27smpx", 0 },
 191         { }
 192 };
 193 MODULE_DEVICE_TABLE(i2c, vp27smpx_id);
 194
 195 static struct i2c_driver vp27smpx_driver = {
 196         .driver = {
 197                 .owner  = THIS_MODULE,
 198                 .name   = "vp27smpx",
 199         },
 200         .probe          = vp27smpx_probe,
 201         .remove         = vp27smpx_remove,
 202         .id_table       = vp27smpx_id,
 203 };
 204
 205 module_i2c_driver(vp27smpx_driver);