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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@cl.uni-heidelberg.de>
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 0.43:
37         Oliver Neukum: avoided DMA coherency issue
38
39  Version 0.42:
40         Converted dsbr100 to use video_ioctl2
41         by Douglas Landgraf <dougsland@gmail.com>
42
43  Version 0.41-ac1:
44         Alan Cox: Some cleanups and fixes
45
46  Version 0.41:
47         Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
48
49  Version 0.40:
50         Markus: Updates for 2.6.x kernels, code layout changes, name sanitizing
51
52  Version 0.30:
53         Markus: Updates for 2.5.x kernel and more ISO compliant source
54
55  Version 0.25:
56         PSL and Markus: Cleanup, radio now doesn't stop on device close
57
58  Version 0.24:
59         Markus: Hope I got these silly VIDEO_TUNER_LOW issues finally
60         right.  Some minor cleanup, improved standalone compilation
61
62  Version 0.23:
63         Markus: Sign extension bug fixed by declaring transfer_buffer unsigned
64
65  Version 0.22:
66         Markus: Some (brown bag) cleanup in what VIDIOCSTUNER returns,
67         thanks to Mike Cox for pointing the problem out.
68
69  Version 0.21:
70         Markus: Minor cleanup, warnings if something goes wrong, lame attempt
71         to adhere to Documentation/CodingStyle
72
73  Version 0.2:
74         Brad Hards <bradh@dynamite.com.au>: Fixes to make it work as non-module
75         Markus: Copyright clarification
76
77  Version 0.01: Markus: initial release
78
79 */
80
81 #include <linux/kernel.h>
82 #include <linux/module.h>
83 #include <linux/init.h>
84 #include <linux/slab.h>
85 #include <linux/input.h>
86 #include <linux/videodev2.h>
87 #include <media/v4l2-common.h>
88 #include <media/v4l2-ioctl.h>
89 #include <linux/usb.h>
90
91 /*
92  * Version Information
93  */
94 #include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
95
96 #define DRIVER_VERSION "v0.41"
97 #define RADIO_VERSION KERNEL_VERSION(0,4,1)
98
99 static struct v4l2_queryctrl radio_qctrl[] = {
100         {
101                 .id            = V4L2_CID_AUDIO_MUTE,
102                 .name          = "Mute",
103                 .minimum       = 0,
104                 .maximum       = 1,
105                 .default_value = 1,
106                 .type          = V4L2_CTRL_TYPE_BOOLEAN,
107         }
108 };
109
110 #define DRIVER_AUTHOR "Markus Demleitner <msdemlei@tucana.harvard.edu>"
111 #define DRIVER_DESC "D-Link DSB-R100 USB FM radio driver"
112
113 #define DSB100_VENDOR 0x04b4
114 #define DSB100_PRODUCT 0x1002
115
116 /* Commands the device appears to understand */
117 #define DSB100_TUNE 1
118 #define DSB100_ONOFF 2
119
120 #define TB_LEN 16
121
122 /* Frequency limits in MHz -- these are European values.  For Japanese
123 devices, that would be 76 and 91.  */
124 #define FREQ_MIN  87.5
125 #define FREQ_MAX 108.0
126 #define FREQ_MUL 16000
127
128
129 static int usb_dsbr100_probe(struct usb_interface *intf,
130                              const struct usb_device_id *id);
131 static void usb_dsbr100_disconnect(struct usb_interface *intf);
132 static int usb_dsbr100_open(struct inode *inode, struct file *file);
133 static int usb_dsbr100_close(struct inode *inode, struct file *file);
134
135 static int radio_nr = -1;
136 module_param(radio_nr, int, 0);
137
138 /* Data for one (physical) device */
139 struct dsbr100_device {
140         struct usb_device *usbdev;
141         struct video_device *videodev;
142         u8 *transfer_buffer;
143         int curfreq;
144         int stereo;
145         int users;
146         int removed;
147         int muted;
148 };
149
150
151 static struct usb_device_id usb_dsbr100_device_table [] = {
152         { USB_DEVICE(DSB100_VENDOR, DSB100_PRODUCT) },
153         { }                                             /* Terminating entry */
154 };
155
156 MODULE_DEVICE_TABLE (usb, usb_dsbr100_device_table);
157
158 /* USB subsystem interface */
159 static struct usb_driver usb_dsbr100_driver = {
160         .name =         "dsbr100",
161         .probe =        usb_dsbr100_probe,
162         .disconnect =   usb_dsbr100_disconnect,
163         .id_table =     usb_dsbr100_device_table,
164 };
165
166 /* Low-level device interface begins here */
167
168 /* switch on radio */
169 static int dsbr100_start(struct dsbr100_device *radio)
170 {
171         if (usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
172                         USB_REQ_GET_STATUS,
173                         USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
174                         0x00, 0xC7, radio->transfer_buffer, 8, 300)<0 ||
175         usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
176                         DSB100_ONOFF,
177                         USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
178                         0x01, 0x00, radio->transfer_buffer, 8, 300)<0)
179                 return -1;
180         radio->muted=0;
181         return (radio->transfer_buffer)[0];
182 }
183
184
185 /* switch off radio */
186 static int dsbr100_stop(struct dsbr100_device *radio)
187 {
188         if (usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
189                         USB_REQ_GET_STATUS,
190                         USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
191                         0x16, 0x1C, radio->transfer_buffer, 8, 300)<0 ||
192         usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
193                         DSB100_ONOFF,
194                         USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
195                         0x00, 0x00, radio->transfer_buffer, 8, 300)<0)
196                 return -1;
197         radio->muted=1;
198         return (radio->transfer_buffer)[0];
199 }
200
201 /* set a frequency, freq is defined by v4l's TUNER_LOW, i.e. 1/16th kHz */
202 static int dsbr100_setfreq(struct dsbr100_device *radio, int freq)
203 {
204         freq = (freq/16*80)/1000+856;
205         if (usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
206                         DSB100_TUNE,
207                         USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
208                         (freq>>8)&0x00ff, freq&0xff,
209                         radio->transfer_buffer, 8, 300)<0 ||
210            usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
211                         USB_REQ_GET_STATUS,
212                         USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
213                         0x96, 0xB7, radio->transfer_buffer, 8, 300)<0 ||
214         usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
215                         USB_REQ_GET_STATUS,
216                         USB_TYPE_VENDOR | USB_RECIP_DEVICE |  USB_DIR_IN,
217                         0x00, 0x24, radio->transfer_buffer, 8, 300)<0) {
218                 radio->stereo = -1;
219                 return -1;
220         }
221         radio->stereo = ! ((radio->transfer_buffer)[0]&0x01);
222         return (radio->transfer_buffer)[0];
223 }
224
225 /* return the device status.  This is, in effect, just whether it
226 sees a stereo signal or not.  Pity. */
227 static void dsbr100_getstat(struct dsbr100_device *radio)
228 {
229         if (usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
230                 USB_REQ_GET_STATUS,
231                 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
232                 0x00 , 0x24, radio->transfer_buffer, 8, 300)<0)
233                 radio->stereo = -1;
234         else
235                 radio->stereo = ! (radio->transfer_buffer[0]&0x01);
236 }
237
238
239 /* USB subsystem interface begins here */
240
241 /* handle unplugging of the device, release data structures
242 if nothing keeps us from doing it.  If something is still
243 keeping us busy, the release callback of v4l will take care
244 of releasing it. */
245 static void usb_dsbr100_disconnect(struct usb_interface *intf)
246 {
247         struct dsbr100_device *radio = usb_get_intfdata(intf);
248
249         usb_set_intfdata (intf, NULL);
250         if (radio) {
251                 video_unregister_device(radio->videodev);
252                 radio->videodev = NULL;
253                 if (radio->users) {
254                         kfree(radio->transfer_buffer);
255                         kfree(radio);
256                 } else {
257                         radio->removed = 1;
258                 }
259         }
260 }
261
262
263 static int vidioc_querycap(struct file *file, void *priv,
264                                         struct v4l2_capability *v)
265 {
266         strlcpy(v->driver, "dsbr100", sizeof(v->driver));
267         strlcpy(v->card, "D-Link R-100 USB FM Radio", sizeof(v->card));
268         sprintf(v->bus_info, "ISA");
269         v->version = RADIO_VERSION;
270         v->capabilities = V4L2_CAP_TUNER;
271         return 0;
272 }
273
274 static int vidioc_g_tuner(struct file *file, void *priv,
275                                 struct v4l2_tuner *v)
276 {
277         struct dsbr100_device *radio = video_drvdata(file);
278
279         if (v->index > 0)
280                 return -EINVAL;
281
282         dsbr100_getstat(radio);
283         strcpy(v->name, "FM");
284         v->type = V4L2_TUNER_RADIO;
285         v->rangelow = FREQ_MIN*FREQ_MUL;
286         v->rangehigh = FREQ_MAX*FREQ_MUL;
287         v->rxsubchans = V4L2_TUNER_SUB_MONO|V4L2_TUNER_SUB_STEREO;
288         v->capability = V4L2_TUNER_CAP_LOW;
289         if(radio->stereo)
290                 v->audmode = V4L2_TUNER_MODE_STEREO;
291         else
292                 v->audmode = V4L2_TUNER_MODE_MONO;
293         v->signal = 0xffff;     /* We can't get the signal strength */
294         return 0;
295 }
296
297 static int vidioc_s_tuner(struct file *file, void *priv,
298                                 struct v4l2_tuner *v)
299 {
300         if (v->index > 0)
301                 return -EINVAL;
302
303         return 0;
304 }
305
306 static int vidioc_s_frequency(struct file *file, void *priv,
307                                 struct v4l2_frequency *f)
308 {
309         struct dsbr100_device *radio = video_drvdata(file);
310
311         radio->curfreq = f->frequency;
312         if (dsbr100_setfreq(radio, radio->curfreq)==-1)
313                 dev_warn(&radio->usbdev->dev, "Set frequency failed\n");
314         return 0;
315 }
316
317 static int vidioc_g_frequency(struct file *file, void *priv,
318                                 struct v4l2_frequency *f)
319 {
320         struct dsbr100_device *radio = video_drvdata(file);
321
322         f->type = V4L2_TUNER_RADIO;
323         f->frequency = radio->curfreq;
324         return 0;
325 }
326
327 static int vidioc_queryctrl(struct file *file, void *priv,
328                                 struct v4l2_queryctrl *qc)
329 {
330         int i;
331
332         for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
333                 if (qc->id && qc->id == radio_qctrl[i].id) {
334                         memcpy(qc, &(radio_qctrl[i]),
335                                                 sizeof(*qc));
336                         return 0;
337                 }
338         }
339         return -EINVAL;
340 }
341
342 static int vidioc_g_ctrl(struct file *file, void *priv,
343                                 struct v4l2_control *ctrl)
344 {
345         struct dsbr100_device *radio = video_drvdata(file);
346
347         switch (ctrl->id) {
348         case V4L2_CID_AUDIO_MUTE:
349                 ctrl->value = radio->muted;
350                 return 0;
351         }
352         return -EINVAL;
353 }
354
355 static int vidioc_s_ctrl(struct file *file, void *priv,
356                                 struct v4l2_control *ctrl)
357 {
358         struct dsbr100_device *radio = video_drvdata(file);
359
360         switch (ctrl->id) {
361         case V4L2_CID_AUDIO_MUTE:
362                 if (ctrl->value) {
363                         if (dsbr100_stop(radio) == -1) {
364                                 dev_warn(&radio->usbdev->dev,
365                                          "Radio did not respond properly\n");
366                                 return -EBUSY;
367                         }
368                 } else {
369                         if (dsbr100_start(radio) == -1) {
370                                 dev_warn(&radio->usbdev->dev,
371                                          "Radio did not respond properly\n");
372                                 return -EBUSY;
373                         }
374                 }
375                 return 0;
376         }
377         return -EINVAL;
378 }
379
380 static int vidioc_g_audio(struct file *file, void *priv,
381                                 struct v4l2_audio *a)
382 {
383         if (a->index > 1)
384                 return -EINVAL;
385
386         strcpy(a->name, "Radio");
387         a->capability = V4L2_AUDCAP_STEREO;
388         return 0;
389 }
390
391 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
392 {
393         *i = 0;
394         return 0;
395 }
396
397 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
398 {
399         if (i != 0)
400                 return -EINVAL;
401         return 0;
402 }
403
404 static int vidioc_s_audio(struct file *file, void *priv,
405                                         struct v4l2_audio *a)
406 {
407         if (a->index != 0)
408                 return -EINVAL;
409         return 0;
410 }
411
412 static int usb_dsbr100_open(struct inode *inode, struct file *file)
413 {
414         struct dsbr100_device *radio = video_drvdata(file);
415
416         lock_kernel();
417         radio->users = 1;
418         radio->muted = 1;
419
420         if (dsbr100_start(radio)<0) {
421                 dev_warn(&radio->usbdev->dev,
422                          "Radio did not start up properly\n");
423                 radio->users = 0;
424                 unlock_kernel();
425                 return -EIO;
426         }
427         dsbr100_setfreq(radio, radio->curfreq);
428         unlock_kernel();
429         return 0;
430 }
431
432 static int usb_dsbr100_close(struct inode *inode, struct file *file)
433 {
434         struct dsbr100_device *radio = video_drvdata(file);
435
436         if (!radio)
437                 return -ENODEV;
438         radio->users = 0;
439         if (radio->removed) {
440                 kfree(radio->transfer_buffer);
441                 kfree(radio);
442         }
443         return 0;
444 }
445
446 /* File system interface */
447 static const struct file_operations usb_dsbr100_fops = {
448         .owner          = THIS_MODULE,
449         .open           = usb_dsbr100_open,
450         .release        = usb_dsbr100_close,
451         .ioctl          = video_ioctl2,
452 #ifdef CONFIG_COMPAT
453         .compat_ioctl   = v4l_compat_ioctl32,
454 #endif
455         .llseek         = no_llseek,
456 };
457
458 static const struct v4l2_ioctl_ops usb_dsbr100_ioctl_ops = {
459         .vidioc_querycap    = vidioc_querycap,
460         .vidioc_g_tuner     = vidioc_g_tuner,
461         .vidioc_s_tuner     = vidioc_s_tuner,
462         .vidioc_g_frequency = vidioc_g_frequency,
463         .vidioc_s_frequency = vidioc_s_frequency,
464         .vidioc_queryctrl   = vidioc_queryctrl,
465         .vidioc_g_ctrl      = vidioc_g_ctrl,
466         .vidioc_s_ctrl      = vidioc_s_ctrl,
467         .vidioc_g_audio     = vidioc_g_audio,
468         .vidioc_s_audio     = vidioc_s_audio,
469         .vidioc_g_input     = vidioc_g_input,
470         .vidioc_s_input     = vidioc_s_input,
471 };
472
473 /* V4L2 interface */
474 static struct video_device dsbr100_videodev_template = {
475         .name           = "D-Link DSB-R 100",
476         .fops           = &usb_dsbr100_fops,
477         .ioctl_ops      = &usb_dsbr100_ioctl_ops,
478         .release        = video_device_release,
479 };
480
481 /* check if the device is present and register with v4l and
482 usb if it is */
483 static int usb_dsbr100_probe(struct usb_interface *intf,
484                                 const struct usb_device_id *id)
485 {
486         struct dsbr100_device *radio;
487
488         if (!(radio = kmalloc(sizeof(struct dsbr100_device), GFP_KERNEL)))
489                 return -ENOMEM;
490         if (!(radio->transfer_buffer = kmalloc(TB_LEN, GFP_KERNEL))) {
491                 kfree(radio);
492                 return -ENOMEM;
493         }
494         if (!(radio->videodev = video_device_alloc())) {
495                 kfree(radio->transfer_buffer);
496                 kfree(radio);
497                 return -ENOMEM;
498         }
499         memcpy(radio->videodev, &dsbr100_videodev_template,
500                 sizeof(dsbr100_videodev_template));
501         radio->removed = 0;
502         radio->users = 0;
503         radio->usbdev = interface_to_usbdev(intf);
504         radio->curfreq = FREQ_MIN*FREQ_MUL;
505         video_set_drvdata(radio->videodev, radio);
506         if (video_register_device(radio->videodev, VFL_TYPE_RADIO, radio_nr) < 0) {
507                 dev_warn(&intf->dev, "Could not register video device\n");
508                 video_device_release(radio->videodev);
509                 kfree(radio->transfer_buffer);
510                 kfree(radio);
511                 return -EIO;
512         }
513         usb_set_intfdata(intf, radio);
514         return 0;
515 }
516
517 static int __init dsbr100_init(void)
518 {
519         int retval = usb_register(&usb_dsbr100_driver);
520         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
521                DRIVER_DESC "\n");
522         return retval;
523 }
524
525 static void __exit dsbr100_exit(void)
526 {
527         usb_deregister(&usb_dsbr100_driver);
528 }
529
530 module_init (dsbr100_init);
531 module_exit (dsbr100_exit);
532
533 MODULE_AUTHOR( DRIVER_AUTHOR );
534 MODULE_DESCRIPTION( DRIVER_DESC );
535 MODULE_LICENSE("GPL");