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-legacy.h>
  34
  35 MODULE_DESCRIPTION("vp27smpx driver");
  36 MODULE_AUTHOR("Hans Verkuil");
  37 MODULE_LICENSE("GPL");
  38
  39 static unsigned short normal_i2c[] = { 0xb6 >> 1, I2C_CLIENT_END };
  40
  41
  42 I2C_CLIENT_INSMOD;
  43
  44 /* ----------------------------------------------------------------------- */
  45
  46 struct vp27smpx_state {
  47         int radio;
  48         u32 audmode;
  49 };
  50
  51 static void vp27smpx_set_audmode(struct i2c_client *client, u32 audmode)
  52 {
  53         struct vp27smpx_state *state = i2c_get_clientdata(client);
  54         u8 data[3] = { 0x00, 0x00, 0x04 };
  55
  56         switch (audmode) {
  57                 case V4L2_TUNER_MODE_MONO:
  58                 case V4L2_TUNER_MODE_LANG1:
  59                         break;
  60                 case V4L2_TUNER_MODE_STEREO:
  61                 case V4L2_TUNER_MODE_LANG1_LANG2:
  62                         data[1] = 0x01;
  63                         break;
  64                 case V4L2_TUNER_MODE_LANG2:
  65                         data[1] = 0x02;
  66                         break;
  67         }
  68
  69         if (i2c_master_send(client, data, sizeof(data)) != sizeof(data)) {
  70                 v4l_err(client, "%s: I/O error setting audmode\n", client->name);
  71         }
  72         else {
  73                 state->audmode = audmode;
  74         }
  75 }
  76
  77 static int vp27smpx_command(struct i2c_client *client, unsigned int cmd, void *arg)
  78 {
  79         struct vp27smpx_state *state = i2c_get_clientdata(client);
  80         struct v4l2_tuner *vt = arg;
  81
  82         switch (cmd) {
  83         case AUDC_SET_RADIO:
  84                 state->radio = 1;
  85                 break;
  86
  87         case VIDIOC_S_STD:
  88                 state->radio = 0;
  89                 break;
  90
  91         case VIDIOC_S_TUNER:
  92                 if (!state->radio)
  93                         vp27smpx_set_audmode(client, vt->audmode);
  94                 break;
  95
  96         case VIDIOC_G_TUNER:
  97                 if (state->radio)
  98                         break;
  99                 vt->audmode = state->audmode;
 100                 vt->capability = V4L2_TUNER_CAP_STEREO |
 101                         V4L2_TUNER_CAP_LANG1 | V4L2_TUNER_CAP_LANG2;
 102                 vt->rxsubchans = V4L2_TUNER_SUB_MONO;
 103                 break;
 104
 105         case VIDIOC_G_CHIP_IDENT:
 106                 return v4l2_chip_ident_i2c_client(client, arg, V4L2_IDENT_VP27SMPX, 0);
 107
 108         case VIDIOC_LOG_STATUS:
 109                 v4l_info(client, "Audio Mode: %u%s\n", state->audmode,
 110                                 state->radio ? " (Radio)" : "");
 111                 break;
 112
 113         default:
 114                 return -EINVAL;
 115         }
 116         return 0;
 117 }
 118
 119 /* ----------------------------------------------------------------------- */
 120
 121 /* i2c implementation */
 122
 123 /*
 124  * Generic i2c probe
 125  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 126  */
 127
 128 static int vp27smpx_probe(struct i2c_client *client)
 129 {
 130         struct vp27smpx_state *state;
 131
 132         /* Check if the adapter supports the needed features */
 133         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 134                 return -EIO;
 135
 136         snprintf(client->name, sizeof(client->name) - 1, "vp27smpx");
 137
 138         v4l_info(client, "chip found @ 0x%x (%s)\n", client->addr << 1, client->adapter->name);
 139
 140         state = kzalloc(sizeof(struct vp27smpx_state), GFP_KERNEL);
 141         if (state == NULL) {
 142                 return -ENOMEM;
 143         }
 144         state->audmode = V4L2_TUNER_MODE_STEREO;
 145         i2c_set_clientdata(client, state);
 146
 147         /* initialize vp27smpx */
 148         vp27smpx_set_audmode(client, state->audmode);
 149         return 0;
 150 }
 151
 152 static int vp27smpx_remove(struct i2c_client *client)
 153 {
 154         kfree(i2c_get_clientdata(client));
 155         return 0;
 156 }
 157
 158 /* ----------------------------------------------------------------------- */
 159
 160 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 161         .name = "vp27smpx",
 162         .driverid = I2C_DRIVERID_VP27SMPX,
 163         .command = vp27smpx_command,
 164         .probe = vp27smpx_probe,
 165         .remove = vp27smpx_remove,
 166 };
 167