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/videodev.h>
  31 #include <media/v4l2-common.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         int radio;
  44         u32 audmode;
  45 };
  46
  47 static void vp27smpx_set_audmode(struct i2c_client *client, u32 audmode)
  48 {
  49         struct vp27smpx_state *state = i2c_get_clientdata(client);
  50         u8 data[3] = { 0x00, 0x00, 0x04 };
  51
  52         switch (audmode) {
  53         case V4L2_TUNER_MODE_MONO:
  54         case V4L2_TUNER_MODE_LANG1:
  55                 break;
  56         case V4L2_TUNER_MODE_STEREO:
  57         case V4L2_TUNER_MODE_LANG1_LANG2:
  58                 data[1] = 0x01;
  59                 break;
  60         case V4L2_TUNER_MODE_LANG2:
  61                 data[1] = 0x02;
  62                 break;
  63         }
  64
  65         if (i2c_master_send(client, data, sizeof(data)) != sizeof(data))
  66                 v4l_err(client, "%s: I/O error setting audmode\n",
  67                                 client->name);
  68         else
  69                 state->audmode = audmode;
  70 }
  71
  72 static int vp27smpx_command(struct i2c_client *client, unsigned cmd, void *arg)
  73 {
  74         struct vp27smpx_state *state = i2c_get_clientdata(client);
  75         struct v4l2_tuner *vt = arg;
  76
  77         switch (cmd) {
  78         case AUDC_SET_RADIO:
  79                 state->radio = 1;
  80                 break;
  81
  82         case VIDIOC_S_STD:
  83                 state->radio = 0;
  84                 break;
  85
  86         case VIDIOC_S_TUNER:
  87                 if (!state->radio)
  88                         vp27smpx_set_audmode(client, vt->audmode);
  89                 break;
  90
  91         case VIDIOC_G_TUNER:
  92                 if (state->radio)
  93                         break;
  94                 vt->audmode = state->audmode;
  95                 vt->capability = V4L2_TUNER_CAP_STEREO |
  96                         V4L2_TUNER_CAP_LANG1 | V4L2_TUNER_CAP_LANG2;
  97                 vt->rxsubchans = V4L2_TUNER_SUB_MONO;
  98                 break;
  99
 100         case VIDIOC_G_CHIP_IDENT:
 101                 return v4l2_chip_ident_i2c_client(client, arg,
 102                                 V4L2_IDENT_VP27SMPX, 0);
 103
 104         case VIDIOC_LOG_STATUS:
 105                 v4l_info(client, "Audio Mode: %u%s\n", state->audmode,
 106                                 state->radio ? " (Radio)" : "");
 107                 break;
 108
 109         default:
 110                 return -EINVAL;
 111         }
 112         return 0;
 113 }
 114
 115 /* ----------------------------------------------------------------------- */
 116
 117 /* i2c implementation */
 118
 119 /*
 120  * Generic i2c probe
 121  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 122  */
 123
 124 static int vp27smpx_probe(struct i2c_client *client)
 125 {
 126         struct vp27smpx_state *state;
 127
 128         /* Check if the adapter supports the needed features */
 129         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 130                 return -EIO;
 131
 132         snprintf(client->name, sizeof(client->name) - 1, "vp27smpx");
 133
 134         v4l_info(client, "chip found @ 0x%x (%s)\n",
 135                         client->addr << 1, client->adapter->name);
 136
 137         state = kzalloc(sizeof(struct vp27smpx_state), GFP_KERNEL);
 138         if (state == NULL)
 139                 return -ENOMEM;
 140         state->audmode = V4L2_TUNER_MODE_STEREO;
 141         i2c_set_clientdata(client, state);
 142
 143         /* initialize vp27smpx */
 144         vp27smpx_set_audmode(client, state->audmode);
 145         return 0;
 146 }
 147
 148 static int vp27smpx_remove(struct i2c_client *client)
 149 {
 150         kfree(i2c_get_clientdata(client));
 151         return 0;
 152 }
 153
 154 /* ----------------------------------------------------------------------- */
 155
 156 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 157         .name = "vp27smpx",
 158         .driverid = I2C_DRIVERID_VP27SMPX,
 159         .command = vp27smpx_command,
 160         .probe = vp27smpx_probe,
 161         .remove = vp27smpx_remove,
 162 };
 163