drivers/usb/dsbr100.c

   1 /* A driver for the D-Link DSB-R100 USB radio.  The R100 plugs
   2  into both the USB and an analog audio input, so this thing
   3  only deals with initialisation and frequency setting, the
   4  audio data has to be handled by a sound driver.
   5
   6  Major issue: I can't find out where the device reports the signal
   7  strength, and indeed the windows software appearantly just looks
   8  at the stereo indicator as well.  So, scanning will only find
   9  stereo stations.  Sad, but I can't help it.
  10
  11  Also, the windows program sends oodles of messages over to the
  12  device, and I couldn't figure out their meaning.  My suspicion
  13  is that they don't have any:-)
  14
  15  You might find some interesting stuff about this module at
  16  http://unimut.fsk.uni-heidelberg.de/unimut/demi/dsbr
  17
  18  Copyright (c) 2000 Markus Demleitner <msdemlei@tucana.harvard.edu>
  19
  20  This program is free software; you can redistribute it and/or modify
  21  it under the terms of the GNU General Public License as published by
  22  the Free Software Foundation; either version 2 of the License, or
  23  (at your option) any later version.
  24
  25  This program is distributed in the hope that it will be useful,
  26  but WITHOUT ANY WARRANTY; without even the implied warranty of
  27  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  28  GNU General Public License for more details.
  29
  30  You should have received a copy of the GNU General Public License
  31  along with this program; if not, write to the Free Software
  32  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  33
  34  History:
  35
  36  Version 0.23:
  37         Markus: Sign extension bug fixed by declaring transfer_buffer unsigned
  38
  39  Version 0.22:
  40         Markus: Some (brown bag) cleanup in what VIDIOCSTUNER returns,
  41         thanks to Mike Cox for pointing the problem out.
  42
  43  Version 0.21:
  44         Markus: Minor cleanup, warnings if something goes wrong, lame attempt
  45         to adhere to Documentation/CodingStyle
  46
  47  Version 0.2:
  48         Brad Hards <bradh@dynamite.com.au>: Fixes to make it work as non-module
  49         Markus: Copyright clarification
  50
  51  Version 0.01: Markus: initial release
  52
  53 */
  54
  55
  56 #include <linux/kernel.h>
  57 #include <linux/module.h>
  58 #include <linux/init.h>
  59 #include <linux/malloc.h>
  60 #include <linux/input.h>
  61 #include <linux/videodev.h>
  62 #include <linux/usb.h>
  63
  64 #define DSB100_VENDOR 0x04b4
  65 #define DSB100_PRODUCT 0x1002
  66
  67 #define TB_LEN 16
  68
  69 static void *usb_dsbr100_probe(struct usb_device *dev, unsigned int ifnum);
  70 static void usb_dsbr100_disconnect(struct usb_device *dev, void *ptr);
  71 static int usb_dsbr100_ioctl(struct video_device *dev, unsigned int cmd,
  72         void *arg);
  73 static int usb_dsbr100_open(struct video_device *dev, int flags);
  74 static void usb_dsbr100_close(struct video_device *dev);
  75
  76
  77 typedef struct
  78 {       struct urb readurb,writeurb;
  79         struct usb_device *dev;
  80         unsigned char transfer_buffer[TB_LEN];
  81         int curfreq;
  82         int stereo;
  83         int ifnum;
  84 } usb_dsbr100;
  85
  86
  87 static struct video_device usb_dsbr100_radio=
  88 {
  89         "D-Link DSB R-100 USB radio",
  90         VID_TYPE_TUNER,
  91         VID_HARDWARE_AZTECH,
  92         usb_dsbr100_open,
  93         usb_dsbr100_close,
  94         NULL,   /* Can't read  (no capture ability) */
  95         NULL,   /* Can't write */
  96         NULL,   /* No poll */
  97         usb_dsbr100_ioctl,
  98         NULL,
  99         NULL
 100 };
 101
 102 static int users = 0;
 103
 104 static struct usb_driver usb_dsbr100_driver = {
 105         name:           "dsbr100",
 106         probe:          usb_dsbr100_probe,
 107         disconnect:     usb_dsbr100_disconnect,
 108         driver_list: {NULL,NULL},
 109         fops: NULL,
 110         minor: 0
 111 };
 112
 113
 114 static int dsbr100_start(usb_dsbr100 *radio)
 115 {
 116         if (usb_control_msg(radio->dev, usb_rcvctrlpipe(radio->dev, 0),
 117                 0x00, 0xC0, 0x00, 0xC7, radio->transfer_buffer, 8, 300)<0 ||
 118             usb_control_msg(radio->dev, usb_rcvctrlpipe(radio->dev, 0),
 119                 0x02, 0xC0, 0x01, 0x00, radio->transfer_buffer, 8, 300)<0)
 120                 return -1;
 121         return (radio->transfer_buffer)[0];
 122 }
 123
 124
 125 static int dsbr100_stop(usb_dsbr100 *radio)
 126 {
 127         if (usb_control_msg(radio->dev, usb_rcvctrlpipe(radio->dev, 0),
 128                 0x00, 0xC0, 0x16, 0x1C, radio->transfer_buffer, 8, 300)<0 ||
 129             usb_control_msg(radio->dev, usb_rcvctrlpipe(radio->dev, 0),
 130                 0x02, 0xC0, 0x00, 0x00, radio->transfer_buffer, 8, 300)<0)
 131                 return -1;
 132         return (radio->transfer_buffer)[0];
 133 }
 134
 135
 136 static int dsbr100_setfreq(usb_dsbr100 *radio, int freq)
 137 {
 138         freq = (freq*80)/16+856;
 139         if (usb_control_msg(radio->dev, usb_rcvctrlpipe(radio->dev, 0),
 140                 0x01, 0xC0, (freq&0xff00)>>8, freq&0xff,
 141                 radio->transfer_buffer, 8, 300)<0
 142          || usb_control_msg(radio->dev, usb_rcvctrlpipe(radio->dev, 0),
 143                 0x00, 0xC0, 0x96, 0xB7, radio->transfer_buffer, 8, 300)<0 ||
 144             usb_control_msg(radio->dev, usb_rcvctrlpipe(radio->dev, 0),
 145                 0x00, 0xC0, 0x00, 0x24, radio->transfer_buffer, 8, 300)<0) {
 146                 radio->stereo = -1;
 147                 return -1;
 148         }
 149         radio->stereo = ! ((radio->transfer_buffer)[0]&0x01);
 150         return (radio->transfer_buffer)[0];
 151 }
 152
 153 static void dsbr100_getstat(usb_dsbr100 *radio)
 154 {
 155         if (usb_control_msg(radio->dev, usb_rcvctrlpipe(radio->dev, 0),
 156                 0x00, 0xC0, 0x00 , 0x24, radio->transfer_buffer, 8, 300)<0)
 157                 radio->stereo = -1;
 158         else
 159                 radio->stereo = ! (radio->transfer_buffer[0]&0x01);
 160 }
 161
 162
 163 static void *usb_dsbr100_probe(struct usb_device *dev, unsigned int ifnum)
 164 {
 165         usb_dsbr100 *radio;
 166
 167         if (dev->descriptor.idVendor!=DSB100_VENDOR ||
 168                         dev->descriptor.idProduct!=DSB100_PRODUCT)
 169                 return NULL;
 170         if (!(radio = kmalloc(sizeof(usb_dsbr100),GFP_KERNEL)))
 171                 return NULL;
 172         usb_dsbr100_radio.priv = radio;
 173         radio->dev = dev;
 174         radio->ifnum = ifnum;
 175         radio->curfreq = 1454;
 176         return (void*)radio;
 177 }
 178
 179 static void usb_dsbr100_disconnect(struct usb_device *dev, void *ptr)
 180 {
 181         usb_dsbr100 *radio=ptr;
 182
 183         if (users)
 184                 return;
 185         kfree(radio);
 186         usb_dsbr100_radio.priv = NULL;
 187 }
 188
 189 static int usb_dsbr100_ioctl(struct video_device *dev, unsigned int cmd,
 190         void *arg)
 191 {
 192         usb_dsbr100 *radio=dev->priv;
 193
 194         if (!radio)
 195                 return -EINVAL;
 196
 197         switch(cmd)
 198         {
 199                 case VIDIOCGCAP: {
 200                         struct video_capability v;
 201                         v.type=VID_TYPE_TUNER;
 202                         v.channels=1;
 203                         v.audios=1;
 204                         /* No we don't do pictures */
 205                         v.maxwidth=0;
 206                         v.maxheight=0;
 207                         v.minwidth=0;
 208                         v.minheight=0;
 209                         strcpy(v.name, "D-Link R-100 USB Radio");
 210                         if(copy_to_user(arg,&v,sizeof(v)))
 211                                 return -EFAULT;
 212                         return 0;
 213                 }
 214                 case VIDIOCGTUNER: {
 215                         struct video_tuner v;
 216                         dsbr100_getstat(radio);
 217                         if(copy_from_user(&v, arg,sizeof(v))!=0)
 218                                 return -EFAULT;
 219                         if(v.tuner)     /* Only 1 tuner */
 220                                 return -EINVAL;
 221                         v.rangelow = 87*16;
 222                         v.rangehigh = 108*16;
 223                         v.flags = VIDEO_TUNER_LOW;
 224                         v.mode = VIDEO_MODE_AUTO;
 225                         v.signal = radio->stereo*0x7000;
 226                                 /* Don't know how to get signal strength */
 227                         v.flags |= VIDEO_TUNER_STEREO_ON*radio->stereo;
 228                         strcpy(v.name, "DSB R-100");
 229                         if(copy_to_user(arg,&v, sizeof(v)))
 230                                 return -EFAULT;
 231                         return 0;
 232                 }
 233                 case VIDIOCSTUNER: {
 234                         struct video_tuner v;
 235                         if(copy_from_user(&v, arg, sizeof(v)))
 236                                 return -EFAULT;
 237                         if(v.tuner!=0)
 238                                 return -EINVAL;
 239                         /* Only 1 tuner so no setting needed ! */
 240                         return 0;
 241                 }
 242                 case VIDIOCGFREQ:
 243                         if (radio->curfreq==-1)
 244                                 return -EINVAL;
 245                         if(copy_to_user(arg, &(radio->curfreq),
 246                                 sizeof(radio->curfreq)))
 247                                 return -EFAULT;
 248                         return 0;
 249
 250                 case VIDIOCSFREQ:
 251                         if(copy_from_user(&(radio->curfreq), arg,
 252                                 sizeof(radio->curfreq)))
 253                                 return -EFAULT;
 254                         if (dsbr100_setfreq(radio, radio->curfreq)==-1)
 255                                 warn("set frequency failed");
 256                         return 0;
 257
 258                 case VIDIOCGAUDIO: {
 259                         struct video_audio v;
 260                         memset(&v,0, sizeof(v));
 261                         v.flags|=VIDEO_AUDIO_MUTABLE;
 262                         v.mode=VIDEO_SOUND_STEREO;
 263                         v.volume=1;
 264                         v.step=1;
 265                         strcpy(v.name, "Radio");
 266                         if(copy_to_user(arg,&v, sizeof(v)))
 267                                 return -EFAULT;
 268                         return 0;
 269                 }
 270                 case VIDIOCSAUDIO: {
 271                         struct video_audio v;
 272                         if(copy_from_user(&v, arg, sizeof(v)))
 273                                 return -EFAULT;
 274                         if(v.audio)
 275                                 return -EINVAL;
 276
 277                         if(v.flags&VIDEO_AUDIO_MUTE) {
 278                                 if (dsbr100_stop(radio)==-1)
 279                                         warn("radio did not respond properly");
 280                         }
 281                         else
 282                                 if (dsbr100_start(radio)==-1)
 283                                         warn("radio did not respond properly");
 284                         return 0;
 285                 }
 286                 default:
 287                         return -ENOIOCTLCMD;
 288         }
 289 }
 290
 291
 292 static int usb_dsbr100_open(struct video_device *dev, int flags)
 293 {
 294         usb_dsbr100 *radio=dev->priv;
 295
 296         if (! radio) {
 297                 warn("radio not initialised");
 298                 return -EAGAIN;
 299         }
 300         if(users)
 301         {
 302                 warn("radio in use");
 303                 return -EBUSY;
 304         }
 305         users++;
 306         MOD_INC_USE_COUNT;
 307         if (dsbr100_start(radio)<0)
 308                 warn("radio did not start up properly");
 309         dsbr100_setfreq(radio,radio->curfreq);
 310         return 0;
 311 }
 312
 313 static void usb_dsbr100_close(struct video_device *dev)
 314 {
 315         usb_dsbr100 *radio=dev->priv;
 316
 317         if (!radio)
 318                 return;
 319         users--;
 320         dsbr100_stop(radio);
 321         MOD_DEC_USE_COUNT;
 322 }
 323
 324 static int __init dsbr100_init(void)
 325 {
 326         usb_dsbr100_radio.priv = NULL;
 327         usb_register(&usb_dsbr100_driver);
 328         if (video_register_device(&usb_dsbr100_radio,VFL_TYPE_RADIO)==-1) {
 329                 warn("couldn't register video device");
 330                 return -EINVAL;
 331         }
 332         return 0;
 333 }
 334
 335 static void __exit dsbr100_exit(void)
 336 {
 337         usb_dsbr100 *radio=usb_dsbr100_radio.priv;
 338
 339         if (radio)
 340                 dsbr100_stop(radio);
 341         video_unregister_device(&usb_dsbr100_radio);
 342         usb_deregister(&usb_dsbr100_driver);
 343 }
 344
 345 module_init (dsbr100_init);
 346 module_exit (dsbr100_exit);
 347
 348 MODULE_AUTHOR("Markus Demleitner <msdemlei@tucana.harvard.edu>");
 349 MODULE_DESCRIPTION("D-Link DSB-R100 USB radio driver");
 350
 351 /*
 352 vi: ts=8
 353 Sigh.  Of course, I am one of the ts=2 heretics, but Linus' wish is
 354 my command.
 355 */