drivers/media/video/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/ioctl.h>
  27 #include <asm/uaccess.h>
  28 #include <linux/i2c.h>
  29 #include <linux/i2c-id.h>
  30 #include <linux/videodev2.h>
  31 #include <media/v4l2-device.h>
  32 #include <media/v4l2-chip-ident.h>
  33 #include <media/v4l2-i2c-drv.h>
  34
  35 MODULE_DESCRIPTION("vp27smpx driver");
  36 MODULE_AUTHOR("Hans Verkuil");
  37 MODULE_LICENSE("GPL");
  38
  39
  40 /* ----------------------------------------------------------------------- */
  41
  42 struct vp27smpx_state {
  43         struct v4l2_subdev sd;
  44         int radio;
  45         u32 audmode;
  46 };
  47
  48 static inline struct vp27smpx_state *to_state(struct v4l2_subdev *sd)
  49 {
  50         return container_of(sd, struct vp27smpx_state, sd);
  51 }
  52
  53 static void vp27smpx_set_audmode(struct v4l2_subdev *sd, u32 audmode)
  54 {
  55         struct vp27smpx_state *state = to_state(sd);
  56         struct i2c_client *client = v4l2_get_subdevdata(sd);
  57         u8 data[3] = { 0x00, 0x00, 0x04 };
  58
  59         switch (audmode) {
  60         case V4L2_TUNER_MODE_MONO:
  61         case V4L2_TUNER_MODE_LANG1:
  62                 break;
  63         case V4L2_TUNER_MODE_STEREO:
  64         case V4L2_TUNER_MODE_LANG1_LANG2:
  65                 data[1] = 0x01;
  66                 break;
  67         case V4L2_TUNER_MODE_LANG2:
  68                 data[1] = 0x02;
  69                 break;
  70         }
  71
  72         if (i2c_master_send(client, data, sizeof(data)) != sizeof(data))
  73                 v4l2_err(sd, "I/O error setting audmode\n");
  74         else
  75                 state->audmode = audmode;
  76 }
  77
  78 static int vp27smpx_s_radio(struct v4l2_subdev *sd)
  79 {
  80         struct vp27smpx_state *state = to_state(sd);
  81
  82         state->radio = 1;
  83         return 0;
  84 }
  85
  86 static int vp27smpx_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
  87 {
  88         struct vp27smpx_state *state = to_state(sd);
  89
  90         state->radio = 0;
  91         return 0;
  92 }
  93
  94 static int vp27smpx_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
  95 {
  96         struct vp27smpx_state *state = to_state(sd);
  97
  98         if (!state->radio)
  99                 vp27smpx_set_audmode(sd, vt->audmode);
 100         return 0;
 101 }
 102
 103 static int vp27smpx_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
 104 {
 105         struct vp27smpx_state *state = to_state(sd);
 106
 107         if (state->radio)
 108                 return 0;
 109         vt->audmode = state->audmode;
 110         vt->capability = V4L2_TUNER_CAP_STEREO |
 111                 V4L2_TUNER_CAP_LANG1 | V4L2_TUNER_CAP_LANG2;
 112         vt->rxsubchans = V4L2_TUNER_SUB_MONO;
 113         return 0;
 114 }
 115
 116 static int vp27smpx_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
 117 {
 118         struct i2c_client *client = v4l2_get_subdevdata(sd);
 119
 120         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_VP27SMPX, 0);
 121 }
 122
 123 static int vp27smpx_log_status(struct v4l2_subdev *sd)
 124 {
 125         struct vp27smpx_state *state = to_state(sd);
 126
 127         v4l2_info(sd, "Audio Mode: %u%s\n", state->audmode,
 128                         state->radio ? " (Radio)" : "");
 129         return 0;
 130 }
 131
 132 /* ----------------------------------------------------------------------- */
 133
 134 static const struct v4l2_subdev_core_ops vp27smpx_core_ops = {
 135         .log_status = vp27smpx_log_status,
 136         .g_chip_ident = vp27smpx_g_chip_ident,
 137         .s_std = vp27smpx_s_std,
 138 };
 139
 140 static const struct v4l2_subdev_tuner_ops vp27smpx_tuner_ops = {
 141         .s_radio = vp27smpx_s_radio,
 142         .s_tuner = vp27smpx_s_tuner,
 143         .g_tuner = vp27smpx_g_tuner,
 144 };
 145
 146 static const struct v4l2_subdev_ops vp27smpx_ops = {
 147         .core = &vp27smpx_core_ops,
 148         .tuner = &vp27smpx_tuner_ops,
 149 };
 150
 151 /* ----------------------------------------------------------------------- */
 152
 153 /* i2c implementation */
 154
 155 /*
 156  * Generic i2c probe
 157  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 158  */
 159
 160 static int vp27smpx_probe(struct i2c_client *client,
 161                           const struct i2c_device_id *id)
 162 {
 163         struct vp27smpx_state *state;
 164         struct v4l2_subdev *sd;
 165
 166         /* Check if the adapter supports the needed features */
 167         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 168                 return -EIO;
 169
 170         v4l_info(client, "chip found @ 0x%x (%s)\n",
 171                         client->addr << 1, client->adapter->name);
 172
 173         state = kzalloc(sizeof(struct vp27smpx_state), GFP_KERNEL);
 174         if (state == NULL)
 175                 return -ENOMEM;
 176         sd = &state->sd;
 177         v4l2_i2c_subdev_init(sd, client, &vp27smpx_ops);
 178         state->audmode = V4L2_TUNER_MODE_STEREO;
 179
 180         /* initialize vp27smpx */
 181         vp27smpx_set_audmode(sd, state->audmode);
 182         return 0;
 183 }
 184
 185 static int vp27smpx_remove(struct i2c_client *client)
 186 {
 187         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 188
 189         v4l2_device_unregister_subdev(sd);
 190         kfree(to_state(sd));
 191         return 0;
 192 }
 193
 194 /* ----------------------------------------------------------------------- */
 195
 196 static const struct i2c_device_id vp27smpx_id[] = {
 197         { "vp27smpx", 0 },
 198         { }
 199 };
 200 MODULE_DEVICE_TABLE(i2c, vp27smpx_id);
 201
 202 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 203         .name = "vp27smpx",
 204         .probe = vp27smpx_probe,
 205         .remove = vp27smpx_remove,
 206         .id_table = vp27smpx_id,
 207 };