1 /* A driver for the D-Link DSB-R100 USB radio and Gemtek USB Radio 21.
2 The device plugs 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.
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.
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:-)
15 You might find some interesting stuff about this module at
16 http://unimut.fsk.uni-heidelberg.de/unimut/demi/dsbr
18 Copyright (c) 2000 Markus Demleitner <msdemlei@cl.uni-heidelberg.de>
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.
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.
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
37 Removed usb_dsbr100_open/close calls and radio->users counter. Also,
38 radio->muted changed to radio->status and suspend/resume calls updated.
41 Converted to v4l2_device.
44 Add suspend/resume functions, fix unplug of device,
45 a lot of cleanups and fixes by Alexey Klimov <klimov.linux@gmail.com>
48 Oliver Neukum: avoided DMA coherency issue
51 Converted dsbr100 to use video_ioctl2
52 by Douglas Landgraf <dougsland@gmail.com>
55 Alan Cox: Some cleanups and fixes
58 Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
61 Markus: Updates for 2.6.x kernels, code layout changes, name sanitizing
64 Markus: Updates for 2.5.x kernel and more ISO compliant source
67 PSL and Markus: Cleanup, radio now doesn't stop on device close
70 Markus: Hope I got these silly VIDEO_TUNER_LOW issues finally
71 right. Some minor cleanup, improved standalone compilation
74 Markus: Sign extension bug fixed by declaring transfer_buffer unsigned
77 Markus: Some (brown bag) cleanup in what VIDIOCSTUNER returns,
78 thanks to Mike Cox for pointing the problem out.
81 Markus: Minor cleanup, warnings if something goes wrong, lame attempt
82 to adhere to Documentation/CodingStyle
85 Brad Hards <bradh@dynamite.com.au>: Fixes to make it work as non-module
86 Markus: Copyright clarification
88 Version 0.01: Markus: initial release
92 #include <linux/kernel.h>
93 #include <linux/module.h>
94 #include <linux/init.h>
95 #include <linux/slab.h>
96 #include <linux/input.h>
97 #include <linux/videodev2.h>
98 #include <media/v4l2-device.h>
99 #include <media/v4l2-ioctl.h>
100 #include <linux/usb.h>
103 * Version Information
105 #include <linux/version.h> /* for KERNEL_VERSION MACRO */
107 #define DRIVER_VERSION "v0.46"
108 #define RADIO_VERSION KERNEL_VERSION(0, 4, 6)
110 #define DRIVER_AUTHOR "Markus Demleitner <msdemlei@tucana.harvard.edu>"
111 #define DRIVER_DESC "D-Link DSB-R100 USB FM radio driver"
113 #define DSB100_VENDOR 0x04b4
114 #define DSB100_PRODUCT 0x1002
116 /* Commands the device appears to understand */
117 #define DSB100_TUNE 1
118 #define DSB100_ONOFF 2
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
128 /* defines for radio->status */
132 #define v4l2_dev_to_radio(d) container_of(d, struct dsbr100_device, v4l2_dev)
134 static int usb_dsbr100_probe(struct usb_interface *intf,
135 const struct usb_device_id *id);
136 static void usb_dsbr100_disconnect(struct usb_interface *intf);
137 static int usb_dsbr100_suspend(struct usb_interface *intf,
138 pm_message_t message);
139 static int usb_dsbr100_resume(struct usb_interface *intf);
141 static int radio_nr = -1;
142 module_param(radio_nr, int, 0);
144 /* Data for one (physical) device */
145 struct dsbr100_device {
146 struct usb_device *usbdev;
147 struct video_device videodev;
148 struct v4l2_device v4l2_dev;
151 struct mutex v4l2_lock;
157 static struct usb_device_id usb_dsbr100_device_table [] = {
158 { USB_DEVICE(DSB100_VENDOR, DSB100_PRODUCT) },
159 { } /* Terminating entry */
162 MODULE_DEVICE_TABLE (usb, usb_dsbr100_device_table);
164 /* USB subsystem interface */
165 static struct usb_driver usb_dsbr100_driver = {
167 .probe = usb_dsbr100_probe,
168 .disconnect = usb_dsbr100_disconnect,
169 .id_table = usb_dsbr100_device_table,
170 .suspend = usb_dsbr100_suspend,
171 .resume = usb_dsbr100_resume,
172 .reset_resume = usb_dsbr100_resume,
173 .supports_autosuspend = 0,
176 /* Low-level device interface begins here */
178 /* switch on radio */
179 static int dsbr100_start(struct dsbr100_device *radio)
184 retval = usb_control_msg(radio->usbdev,
185 usb_rcvctrlpipe(radio->usbdev, 0),
187 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
188 0x00, 0xC7, radio->transfer_buffer, 8, 300);
191 request = USB_REQ_GET_STATUS;
192 goto usb_control_msg_failed;
195 retval = usb_control_msg(radio->usbdev,
196 usb_rcvctrlpipe(radio->usbdev, 0),
198 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
199 0x01, 0x00, radio->transfer_buffer, 8, 300);
202 request = DSB100_ONOFF;
203 goto usb_control_msg_failed;
206 radio->status = STARTED;
207 return (radio->transfer_buffer)[0];
209 usb_control_msg_failed:
210 dev_err(&radio->usbdev->dev,
211 "%s - usb_control_msg returned %i, request %i\n",
212 __func__, retval, request);
217 /* switch off radio */
218 static int dsbr100_stop(struct dsbr100_device *radio)
223 retval = usb_control_msg(radio->usbdev,
224 usb_rcvctrlpipe(radio->usbdev, 0),
226 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
227 0x16, 0x1C, radio->transfer_buffer, 8, 300);
230 request = USB_REQ_GET_STATUS;
231 goto usb_control_msg_failed;
234 retval = usb_control_msg(radio->usbdev,
235 usb_rcvctrlpipe(radio->usbdev, 0),
237 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
238 0x00, 0x00, radio->transfer_buffer, 8, 300);
241 request = DSB100_ONOFF;
242 goto usb_control_msg_failed;
245 radio->status = STOPPED;
246 return (radio->transfer_buffer)[0];
248 usb_control_msg_failed:
249 dev_err(&radio->usbdev->dev,
250 "%s - usb_control_msg returned %i, request %i\n",
251 __func__, retval, request);
256 /* set a frequency, freq is defined by v4l's TUNER_LOW, i.e. 1/16th kHz */
257 static int dsbr100_setfreq(struct dsbr100_device *radio)
261 int freq = (radio->curfreq / 16 * 80) / 1000 + 856;
263 retval = usb_control_msg(radio->usbdev,
264 usb_rcvctrlpipe(radio->usbdev, 0),
266 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
267 (freq >> 8) & 0x00ff, freq & 0xff,
268 radio->transfer_buffer, 8, 300);
271 request = DSB100_TUNE;
272 goto usb_control_msg_failed;
275 retval = usb_control_msg(radio->usbdev,
276 usb_rcvctrlpipe(radio->usbdev, 0),
278 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
279 0x96, 0xB7, radio->transfer_buffer, 8, 300);
282 request = USB_REQ_GET_STATUS;
283 goto usb_control_msg_failed;
286 retval = usb_control_msg(radio->usbdev,
287 usb_rcvctrlpipe(radio->usbdev, 0),
289 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
290 0x00, 0x24, radio->transfer_buffer, 8, 300);
293 request = USB_REQ_GET_STATUS;
294 goto usb_control_msg_failed;
297 radio->stereo = !((radio->transfer_buffer)[0] & 0x01);
298 return (radio->transfer_buffer)[0];
300 usb_control_msg_failed:
302 dev_err(&radio->usbdev->dev,
303 "%s - usb_control_msg returned %i, request %i\n",
304 __func__, retval, request);
308 /* return the device status. This is, in effect, just whether it
309 sees a stereo signal or not. Pity. */
310 static void dsbr100_getstat(struct dsbr100_device *radio)
314 retval = usb_control_msg(radio->usbdev,
315 usb_rcvctrlpipe(radio->usbdev, 0),
317 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
318 0x00 , 0x24, radio->transfer_buffer, 8, 300);
322 dev_err(&radio->usbdev->dev,
323 "%s - usb_control_msg returned %i, request %i\n",
324 __func__, retval, USB_REQ_GET_STATUS);
326 radio->stereo = !(radio->transfer_buffer[0] & 0x01);
330 static int vidioc_querycap(struct file *file, void *priv,
331 struct v4l2_capability *v)
333 struct dsbr100_device *radio = video_drvdata(file);
335 strlcpy(v->driver, "dsbr100", sizeof(v->driver));
336 strlcpy(v->card, "D-Link R-100 USB FM Radio", sizeof(v->card));
337 usb_make_path(radio->usbdev, v->bus_info, sizeof(v->bus_info));
338 v->version = RADIO_VERSION;
339 v->capabilities = V4L2_CAP_TUNER;
343 static int vidioc_g_tuner(struct file *file, void *priv,
344 struct v4l2_tuner *v)
346 struct dsbr100_device *radio = video_drvdata(file);
351 dsbr100_getstat(radio);
352 strcpy(v->name, "FM");
353 v->type = V4L2_TUNER_RADIO;
354 v->rangelow = FREQ_MIN * FREQ_MUL;
355 v->rangehigh = FREQ_MAX * FREQ_MUL;
356 v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
357 v->capability = V4L2_TUNER_CAP_LOW;
359 v->audmode = V4L2_TUNER_MODE_STEREO;
361 v->audmode = V4L2_TUNER_MODE_MONO;
362 v->signal = 0xffff; /* We can't get the signal strength */
366 static int vidioc_s_tuner(struct file *file, void *priv,
367 struct v4l2_tuner *v)
369 return v->index ? -EINVAL : 0;
372 static int vidioc_s_frequency(struct file *file, void *priv,
373 struct v4l2_frequency *f)
375 struct dsbr100_device *radio = video_drvdata(file);
378 radio->curfreq = f->frequency;
380 retval = dsbr100_setfreq(radio);
382 dev_warn(&radio->usbdev->dev, "Set frequency failed\n");
386 static int vidioc_g_frequency(struct file *file, void *priv,
387 struct v4l2_frequency *f)
389 struct dsbr100_device *radio = video_drvdata(file);
391 f->type = V4L2_TUNER_RADIO;
392 f->frequency = radio->curfreq;
396 static int vidioc_queryctrl(struct file *file, void *priv,
397 struct v4l2_queryctrl *qc)
400 case V4L2_CID_AUDIO_MUTE:
401 return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
407 static int vidioc_g_ctrl(struct file *file, void *priv,
408 struct v4l2_control *ctrl)
410 struct dsbr100_device *radio = video_drvdata(file);
413 case V4L2_CID_AUDIO_MUTE:
414 ctrl->value = radio->status;
420 static int vidioc_s_ctrl(struct file *file, void *priv,
421 struct v4l2_control *ctrl)
423 struct dsbr100_device *radio = video_drvdata(file);
427 case V4L2_CID_AUDIO_MUTE:
429 retval = dsbr100_stop(radio);
431 dev_warn(&radio->usbdev->dev,
432 "Radio did not respond properly\n");
436 retval = dsbr100_start(radio);
438 dev_warn(&radio->usbdev->dev,
439 "Radio did not respond properly\n");
448 static int vidioc_g_audio(struct file *file, void *priv,
449 struct v4l2_audio *a)
454 strcpy(a->name, "Radio");
455 a->capability = V4L2_AUDCAP_STEREO;
459 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
465 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
467 return i ? -EINVAL : 0;
470 static int vidioc_s_audio(struct file *file, void *priv,
471 struct v4l2_audio *a)
473 return a->index ? -EINVAL : 0;
476 /* USB subsystem interface begins here */
479 * Handle unplugging of the device.
480 * We call video_unregister_device in any case.
481 * The last function called in this procedure is
482 * usb_dsbr100_video_device_release
484 static void usb_dsbr100_disconnect(struct usb_interface *intf)
486 struct dsbr100_device *radio = usb_get_intfdata(intf);
488 v4l2_device_get(&radio->v4l2_dev);
489 mutex_lock(&radio->v4l2_lock);
490 usb_set_intfdata(intf, NULL);
491 video_unregister_device(&radio->videodev);
492 v4l2_device_disconnect(&radio->v4l2_dev);
493 mutex_unlock(&radio->v4l2_lock);
494 v4l2_device_put(&radio->v4l2_dev);
498 /* Suspend device - stop device. */
499 static int usb_dsbr100_suspend(struct usb_interface *intf, pm_message_t message)
501 struct dsbr100_device *radio = usb_get_intfdata(intf);
504 mutex_lock(&radio->v4l2_lock);
505 if (radio->status == STARTED) {
506 retval = dsbr100_stop(radio);
508 dev_warn(&intf->dev, "dsbr100_stop failed\n");
510 /* After dsbr100_stop() status set to STOPPED.
511 * If we want driver to start radio on resume
512 * we set status equal to STARTED.
513 * On resume we will check status and run radio if needed.
515 radio->status = STARTED;
517 mutex_unlock(&radio->v4l2_lock);
519 dev_info(&intf->dev, "going into suspend..\n");
524 /* Resume device - start device. */
525 static int usb_dsbr100_resume(struct usb_interface *intf)
527 struct dsbr100_device *radio = usb_get_intfdata(intf);
530 mutex_lock(&radio->v4l2_lock);
531 if (radio->status == STARTED) {
532 retval = dsbr100_start(radio);
534 dev_warn(&intf->dev, "dsbr100_start failed\n");
536 mutex_unlock(&radio->v4l2_lock);
538 dev_info(&intf->dev, "coming out of suspend..\n");
543 /* free data structures */
544 static void usb_dsbr100_release(struct v4l2_device *v4l2_dev)
546 struct dsbr100_device *radio = v4l2_dev_to_radio(v4l2_dev);
548 v4l2_device_unregister(&radio->v4l2_dev);
549 kfree(radio->transfer_buffer);
553 /* File system interface */
554 static const struct v4l2_file_operations usb_dsbr100_fops = {
555 .owner = THIS_MODULE,
556 .unlocked_ioctl = video_ioctl2,
559 static const struct v4l2_ioctl_ops usb_dsbr100_ioctl_ops = {
560 .vidioc_querycap = vidioc_querycap,
561 .vidioc_g_tuner = vidioc_g_tuner,
562 .vidioc_s_tuner = vidioc_s_tuner,
563 .vidioc_g_frequency = vidioc_g_frequency,
564 .vidioc_s_frequency = vidioc_s_frequency,
565 .vidioc_queryctrl = vidioc_queryctrl,
566 .vidioc_g_ctrl = vidioc_g_ctrl,
567 .vidioc_s_ctrl = vidioc_s_ctrl,
568 .vidioc_g_audio = vidioc_g_audio,
569 .vidioc_s_audio = vidioc_s_audio,
570 .vidioc_g_input = vidioc_g_input,
571 .vidioc_s_input = vidioc_s_input,
574 /* check if the device is present and register with v4l and usb if it is */
575 static int usb_dsbr100_probe(struct usb_interface *intf,
576 const struct usb_device_id *id)
578 struct dsbr100_device *radio;
579 struct v4l2_device *v4l2_dev;
582 radio = kzalloc(sizeof(struct dsbr100_device), GFP_KERNEL);
587 radio->transfer_buffer = kmalloc(TB_LEN, GFP_KERNEL);
589 if (!(radio->transfer_buffer)) {
594 v4l2_dev = &radio->v4l2_dev;
595 v4l2_dev->release = usb_dsbr100_release;
597 retval = v4l2_device_register(&intf->dev, v4l2_dev);
599 v4l2_err(v4l2_dev, "couldn't register v4l2_device\n");
600 kfree(radio->transfer_buffer);
605 mutex_init(&radio->v4l2_lock);
606 strlcpy(radio->videodev.name, v4l2_dev->name, sizeof(radio->videodev.name));
607 radio->videodev.v4l2_dev = v4l2_dev;
608 radio->videodev.fops = &usb_dsbr100_fops;
609 radio->videodev.ioctl_ops = &usb_dsbr100_ioctl_ops;
610 radio->videodev.release = video_device_release_empty;
611 radio->videodev.lock = &radio->v4l2_lock;
613 radio->usbdev = interface_to_usbdev(intf);
614 radio->curfreq = FREQ_MIN * FREQ_MUL;
615 radio->status = STOPPED;
617 video_set_drvdata(&radio->videodev, radio);
619 retval = video_register_device(&radio->videodev, VFL_TYPE_RADIO, radio_nr);
621 v4l2_err(v4l2_dev, "couldn't register video device\n");
622 v4l2_device_unregister(v4l2_dev);
623 kfree(radio->transfer_buffer);
627 usb_set_intfdata(intf, radio);
631 static int __init dsbr100_init(void)
633 int retval = usb_register(&usb_dsbr100_driver);
634 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
639 static void __exit dsbr100_exit(void)
641 usb_deregister(&usb_dsbr100_driver);
644 module_init (dsbr100_init);
645 module_exit (dsbr100_exit);
647 MODULE_AUTHOR( DRIVER_AUTHOR );
648 MODULE_DESCRIPTION( DRIVER_DESC );
649 MODULE_LICENSE("GPL");