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/videodev2.h>
  31 #include <media/v4l2-device.h>
  32 #include <media/v4l2-chip-ident.h>
  33
  34 MODULE_DESCRIPTION("vp27smpx driver");
  35 MODULE_AUTHOR("Hans Verkuil");
  36 MODULE_LICENSE("GPL");
  37
  38
  39 /* ----------------------------------------------------------------------- */
  40
  41 struct vp27smpx_state {
  42         struct v4l2_subdev sd;
  43         int radio;
  44         u32 audmode;
  45 };
  46
  47 static inline struct vp27smpx_state *to_state(struct v4l2_subdev *sd)
  48 {
  49         return container_of(sd, struct vp27smpx_state, sd);
  50 }
  51
  52 static void vp27smpx_set_audmode(struct v4l2_subdev *sd, u32 audmode)
  53 {
  54         struct vp27smpx_state *state = to_state(sd);
  55         struct i2c_client *client = v4l2_get_subdevdata(sd);
  56         u8 data[3] = { 0x00, 0x00, 0x04 };
  57
  58         switch (audmode) {
  59         case V4L2_TUNER_MODE_MONO:
  60         case V4L2_TUNER_MODE_LANG1:
  61                 break;
  62         case V4L2_TUNER_MODE_STEREO:
  63         case V4L2_TUNER_MODE_LANG1_LANG2:
  64                 data[1] = 0x01;
  65                 break;
  66         case V4L2_TUNER_MODE_LANG2:
  67                 data[1] = 0x02;
  68                 break;
  69         }
  70
  71         if (i2c_master_send(client, data, sizeof(data)) != sizeof(data))
  72                 v4l2_err(sd, "I/O error setting audmode\n");
  73         else
  74                 state->audmode = audmode;
  75 }
  76
  77 static int vp27smpx_s_radio(struct v4l2_subdev *sd)
  78 {
  79         struct vp27smpx_state *state = to_state(sd);
  80
  81         state->radio = 1;
  82         return 0;
  83 }
  84
  85 static int vp27smpx_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
  86 {
  87         struct vp27smpx_state *state = to_state(sd);
  88
  89         state->radio = 0;
  90         return 0;
  91 }
  92
  93 static int vp27smpx_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
  94 {
  95         struct vp27smpx_state *state = to_state(sd);
  96
  97         if (!state->radio)
  98                 vp27smpx_set_audmode(sd, vt->audmode);
  99         return 0;
 100 }
 101
 102 static int vp27smpx_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
 103 {
 104         struct vp27smpx_state *state = to_state(sd);
 105
 106         if (state->radio)
 107                 return 0;
 108         vt->audmode = state->audmode;
 109         vt->capability = V4L2_TUNER_CAP_STEREO |
 110                 V4L2_TUNER_CAP_LANG1 | V4L2_TUNER_CAP_LANG2;
 111         vt->rxsubchans = V4L2_TUNER_SUB_MONO;
 112         return 0;
 113 }
 114
 115 static int vp27smpx_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
 116 {
 117         struct i2c_client *client = v4l2_get_subdevdata(sd);
 118
 119         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_VP27SMPX, 0);
 120 }
 121
 122 static int vp27smpx_log_status(struct v4l2_subdev *sd)
 123 {
 124         struct vp27smpx_state *state = to_state(sd);
 125
 126         v4l2_info(sd, "Audio Mode: %u%s\n", state->audmode,
 127                         state->radio ? " (Radio)" : "");
 128         return 0;
 129 }
 130
 131 /* ----------------------------------------------------------------------- */
 132
 133 static const struct v4l2_subdev_core_ops vp27smpx_core_ops = {
 134         .log_status = vp27smpx_log_status,
 135         .g_chip_ident = vp27smpx_g_chip_ident,
 136         .s_std = vp27smpx_s_std,
 137 };
 138
 139 static const struct v4l2_subdev_tuner_ops vp27smpx_tuner_ops = {
 140         .s_radio = vp27smpx_s_radio,
 141         .s_tuner = vp27smpx_s_tuner,
 142         .g_tuner = vp27smpx_g_tuner,
 143 };
 144
 145 static const struct v4l2_subdev_ops vp27smpx_ops = {
 146         .core = &vp27smpx_core_ops,
 147         .tuner = &vp27smpx_tuner_ops,
 148 };
 149
 150 /* ----------------------------------------------------------------------- */
 151
 152 /* i2c implementation */
 153
 154 /*
 155  * Generic i2c probe
 156  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 157  */
 158
 159 static int vp27smpx_probe(struct i2c_client *client,
 160                           const struct i2c_device_id *id)
 161 {
 162         struct vp27smpx_state *state;
 163         struct v4l2_subdev *sd;
 164
 165         /* Check if the adapter supports the needed features */
 166         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 167                 return -EIO;
 168
 169         v4l_info(client, "chip found @ 0x%x (%s)\n",
 170                         client->addr << 1, client->adapter->name);
 171
 172         state = kzalloc(sizeof(struct vp27smpx_state), GFP_KERNEL);
 173         if (state == NULL)
 174                 return -ENOMEM;
 175         sd = &state->sd;
 176         v4l2_i2c_subdev_init(sd, client, &vp27smpx_ops);
 177         state->audmode = V4L2_TUNER_MODE_STEREO;
 178
 179         /* initialize vp27smpx */
 180         vp27smpx_set_audmode(sd, state->audmode);
 181         return 0;
 182 }
 183
 184 static int vp27smpx_remove(struct i2c_client *client)
 185 {
 186         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 187
 188         v4l2_device_unregister_subdev(sd);
 189         kfree(to_state(sd));
 190         return 0;
 191 }
 192
 193 /* ----------------------------------------------------------------------- */
 194
 195 static const struct i2c_device_id vp27smpx_id[] = {
 196         { "vp27smpx", 0 },
 197         { }
 198 };
 199 MODULE_DEVICE_TABLE(i2c, vp27smpx_id);
 200
 201 static struct i2c_driver vp27smpx_driver = {
 202         .driver = {
 203                 .owner  = THIS_MODULE,
 204                 .name   = "vp27smpx",
 205         },
 206         .probe          = vp27smpx_probe,
 207         .remove         = vp27smpx_remove,
 208         .id_table       = vp27smpx_id,
 209 };
 210
 211 static __init int init_vp27smpx(void)
 212 {
 213         return i2c_add_driver(&vp27smpx_driver);
 214 }
 215
 216 static __exit void exit_vp27smpx(void)
 217 {
 218         i2c_del_driver(&vp27smpx_driver);
 219 }
 220
 221 module_init(init_vp27smpx);
 222 module_exit(exit_vp27smpx);