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/slab.h>
  27 #include <linux/ioctl.h>
  28 #include <asm/uaccess.h>
  29 #include <linux/i2c.h>
  30 #include <linux/i2c-id.h>
  31 #include <linux/videodev2.h>
  32 #include <media/v4l2-device.h>
  33 #include <media/v4l2-chip-ident.h>
  34 #include <media/v4l2-i2c-drv.h>
  35
  36 MODULE_DESCRIPTION("vp27smpx driver");
  37 MODULE_AUTHOR("Hans Verkuil");
  38 MODULE_LICENSE("GPL");
  39
  40
  41 /* ----------------------------------------------------------------------- */
  42
  43 struct vp27smpx_state {
  44         struct v4l2_subdev sd;
  45         int radio;
  46         u32 audmode;
  47 };
  48
  49 static inline struct vp27smpx_state *to_state(struct v4l2_subdev *sd)
  50 {
  51         return container_of(sd, struct vp27smpx_state, sd);
  52 }
  53
  54 static void vp27smpx_set_audmode(struct v4l2_subdev *sd, u32 audmode)
  55 {
  56         struct vp27smpx_state *state = to_state(sd);
  57         struct i2c_client *client = v4l2_get_subdevdata(sd);
  58         u8 data[3] = { 0x00, 0x00, 0x04 };
  59
  60         switch (audmode) {
  61         case V4L2_TUNER_MODE_MONO:
  62         case V4L2_TUNER_MODE_LANG1:
  63                 break;
  64         case V4L2_TUNER_MODE_STEREO:
  65         case V4L2_TUNER_MODE_LANG1_LANG2:
  66                 data[1] = 0x01;
  67                 break;
  68         case V4L2_TUNER_MODE_LANG2:
  69                 data[1] = 0x02;
  70                 break;
  71         }
  72
  73         if (i2c_master_send(client, data, sizeof(data)) != sizeof(data))
  74                 v4l2_err(sd, "I/O error setting audmode\n");
  75         else
  76                 state->audmode = audmode;
  77 }
  78
  79 static int vp27smpx_s_radio(struct v4l2_subdev *sd)
  80 {
  81         struct vp27smpx_state *state = to_state(sd);
  82
  83         state->radio = 1;
  84         return 0;
  85 }
  86
  87 static int vp27smpx_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
  88 {
  89         struct vp27smpx_state *state = to_state(sd);
  90
  91         state->radio = 0;
  92         return 0;
  93 }
  94
  95 static int vp27smpx_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
  96 {
  97         struct vp27smpx_state *state = to_state(sd);
  98
  99         if (!state->radio)
 100                 vp27smpx_set_audmode(sd, vt->audmode);
 101         return 0;
 102 }
 103
 104 static int vp27smpx_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
 105 {
 106         struct vp27smpx_state *state = to_state(sd);
 107
 108         if (state->radio)
 109                 return 0;
 110         vt->audmode = state->audmode;
 111         vt->capability = V4L2_TUNER_CAP_STEREO |
 112                 V4L2_TUNER_CAP_LANG1 | V4L2_TUNER_CAP_LANG2;
 113         vt->rxsubchans = V4L2_TUNER_SUB_MONO;
 114         return 0;
 115 }
 116
 117 static int vp27smpx_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
 118 {
 119         struct i2c_client *client = v4l2_get_subdevdata(sd);
 120
 121         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_VP27SMPX, 0);
 122 }
 123
 124 static int vp27smpx_log_status(struct v4l2_subdev *sd)
 125 {
 126         struct vp27smpx_state *state = to_state(sd);
 127
 128         v4l2_info(sd, "Audio Mode: %u%s\n", state->audmode,
 129                         state->radio ? " (Radio)" : "");
 130         return 0;
 131 }
 132
 133 /* ----------------------------------------------------------------------- */
 134
 135 static const struct v4l2_subdev_core_ops vp27smpx_core_ops = {
 136         .log_status = vp27smpx_log_status,
 137         .g_chip_ident = vp27smpx_g_chip_ident,
 138         .s_std = vp27smpx_s_std,
 139 };
 140
 141 static const struct v4l2_subdev_tuner_ops vp27smpx_tuner_ops = {
 142         .s_radio = vp27smpx_s_radio,
 143         .s_tuner = vp27smpx_s_tuner,
 144         .g_tuner = vp27smpx_g_tuner,
 145 };
 146
 147 static const struct v4l2_subdev_ops vp27smpx_ops = {
 148         .core = &vp27smpx_core_ops,
 149         .tuner = &vp27smpx_tuner_ops,
 150 };
 151
 152 /* ----------------------------------------------------------------------- */
 153
 154 /* i2c implementation */
 155
 156 /*
 157  * Generic i2c probe
 158  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 159  */
 160
 161 static int vp27smpx_probe(struct i2c_client *client,
 162                           const struct i2c_device_id *id)
 163 {
 164         struct vp27smpx_state *state;
 165         struct v4l2_subdev *sd;
 166
 167         /* Check if the adapter supports the needed features */
 168         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 169                 return -EIO;
 170
 171         v4l_info(client, "chip found @ 0x%x (%s)\n",
 172                         client->addr << 1, client->adapter->name);
 173
 174         state = kzalloc(sizeof(struct vp27smpx_state), GFP_KERNEL);
 175         if (state == NULL)
 176                 return -ENOMEM;
 177         sd = &state->sd;
 178         v4l2_i2c_subdev_init(sd, client, &vp27smpx_ops);
 179         state->audmode = V4L2_TUNER_MODE_STEREO;
 180
 181         /* initialize vp27smpx */
 182         vp27smpx_set_audmode(sd, state->audmode);
 183         return 0;
 184 }
 185
 186 static int vp27smpx_remove(struct i2c_client *client)
 187 {
 188         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 189
 190         v4l2_device_unregister_subdev(sd);
 191         kfree(to_state(sd));
 192         return 0;
 193 }
 194
 195 /* ----------------------------------------------------------------------- */
 196
 197 static const struct i2c_device_id vp27smpx_id[] = {
 198         { "vp27smpx", 0 },
 199         { }
 200 };
 201 MODULE_DEVICE_TABLE(i2c, vp27smpx_id);
 202
 203 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 204         .name = "vp27smpx",
 205         .probe = vp27smpx_probe,
 206         .remove = vp27smpx_remove,
 207         .id_table = vp27smpx_id,
 208 };