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.
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 Markus: Updates for 2.6.x kernels, code layout changes, name sanitizing
40 Markus: Updates for 2.5.x kernel and more ISO compliant source
43 PSL and Markus: Cleanup, radio now doesn't stop on device close
46 Markus: Hope I got these silly VIDEO_TUNER_LOW issues finally
47 right. Some minor cleanup, improved standalone compilation
50 Markus: Sign extension bug fixed by declaring transfer_buffer unsigned
53 Markus: Some (brown bag) cleanup in what VIDIOCSTUNER returns,
54 thanks to Mike Cox for pointing the problem out.
57 Markus: Minor cleanup, warnings if something goes wrong, lame attempt
58 to adhere to Documentation/CodingStyle
61 Brad Hards <bradh@dynamite.com.au>: Fixes to make it work as non-module
62 Markus: Copyright clarification
64 Version 0.01: Markus: initial release
69 #include <linux/kernel.h>
70 #include <linux/module.h>
71 #include <linux/init.h>
72 #include <linux/slab.h>
73 #include <linux/input.h>
74 #include <linux/videodev.h>
75 #include <media/v4l2-common.h>
76 #include <linux/usb.h>
77 #include <linux/smp_lock.h>
82 #define DRIVER_VERSION "v0.40"
83 #define DRIVER_AUTHOR "Markus Demleitner <msdemlei@tucana.harvard.edu>"
84 #define DRIVER_DESC "D-Link DSB-R100 USB FM radio driver"
86 #define DSB100_VENDOR 0x04b4
87 #define DSB100_PRODUCT 0x1002
89 /* Commands the device appears to understand */
91 #define DSB100_ONOFF 2
95 /* Frequency limits in MHz -- these are European values. For Japanese
96 devices, that would be 76 and 91. */
98 #define FREQ_MAX 108.0
99 #define FREQ_MUL 16000
102 static int usb_dsbr100_probe(struct usb_interface *intf,
103 const struct usb_device_id *id);
104 static void usb_dsbr100_disconnect(struct usb_interface *intf);
105 static int usb_dsbr100_ioctl(struct inode *inode, struct file *file,
106 unsigned int cmd, unsigned long arg);
107 static int usb_dsbr100_open(struct inode *inode, struct file *file);
108 static int usb_dsbr100_close(struct inode *inode, struct file *file);
110 static int radio_nr = -1;
111 module_param(radio_nr, int, 0);
113 /* Data for one (physical) device */
115 struct usb_device *usbdev;
116 struct video_device *videodev;
117 unsigned char transfer_buffer[TB_LEN];
125 /* File system interface */
126 static struct file_operations usb_dsbr100_fops = {
127 .owner = THIS_MODULE,
128 .open = usb_dsbr100_open,
129 .release = usb_dsbr100_close,
130 .ioctl = usb_dsbr100_ioctl,
131 .compat_ioctl = v4l_compat_ioctl32,
136 static struct video_device dsbr100_videodev_template=
138 .owner = THIS_MODULE,
139 .name = "D-Link DSB-R 100",
140 .type = VID_TYPE_TUNER,
141 .hardware = VID_HARDWARE_AZTECH,
142 .fops = &usb_dsbr100_fops,
143 .release = video_device_release,
146 static struct usb_device_id usb_dsbr100_device_table [] = {
147 { USB_DEVICE(DSB100_VENDOR, DSB100_PRODUCT) },
148 { } /* Terminating entry */
151 MODULE_DEVICE_TABLE (usb, usb_dsbr100_device_table);
153 /* USB subsystem interface */
154 static struct usb_driver usb_dsbr100_driver = {
156 .probe = usb_dsbr100_probe,
157 .disconnect = usb_dsbr100_disconnect,
158 .id_table = usb_dsbr100_device_table,
161 /* Low-level device interface begins here */
163 /* switch on radio */
164 static int dsbr100_start(dsbr100_device *radio)
166 if (usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
168 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
169 0x00, 0xC7, radio->transfer_buffer, 8, 300)<0 ||
170 usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
172 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
173 0x01, 0x00, radio->transfer_buffer, 8, 300)<0)
175 return (radio->transfer_buffer)[0];
179 /* switch off radio */
180 static int dsbr100_stop(dsbr100_device *radio)
182 if (usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
184 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
185 0x16, 0x1C, radio->transfer_buffer, 8, 300)<0 ||
186 usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
188 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
189 0x00, 0x00, radio->transfer_buffer, 8, 300)<0)
191 return (radio->transfer_buffer)[0];
194 /* set a frequency, freq is defined by v4l's TUNER_LOW, i.e. 1/16th kHz */
195 static int dsbr100_setfreq(dsbr100_device *radio, int freq)
197 freq = (freq/16*80)/1000+856;
198 if (usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
200 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
201 (freq>>8)&0x00ff, freq&0xff,
202 radio->transfer_buffer, 8, 300)<0 ||
203 usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
205 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
206 0x96, 0xB7, radio->transfer_buffer, 8, 300)<0 ||
207 usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
209 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
210 0x00, 0x24, radio->transfer_buffer, 8, 300)<0) {
214 radio->stereo = ! ((radio->transfer_buffer)[0]&0x01);
215 return (radio->transfer_buffer)[0];
218 /* return the device status. This is, in effect, just whether it
219 sees a stereo signal or not. Pity. */
220 static void dsbr100_getstat(dsbr100_device *radio)
222 if (usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
224 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
225 0x00 , 0x24, radio->transfer_buffer, 8, 300)<0)
228 radio->stereo = ! (radio->transfer_buffer[0]&0x01);
232 /* USB subsystem interface begins here */
234 /* check if the device is present and register with v4l and
236 static int usb_dsbr100_probe(struct usb_interface *intf,
237 const struct usb_device_id *id)
239 dsbr100_device *radio;
241 if (!(radio = kmalloc(sizeof(dsbr100_device), GFP_KERNEL)))
243 if (!(radio->videodev = video_device_alloc())) {
247 memcpy(radio->videodev, &dsbr100_videodev_template,
248 sizeof(dsbr100_videodev_template));
251 radio->usbdev = interface_to_usbdev(intf);
252 radio->curfreq = FREQ_MIN*FREQ_MUL;
253 video_set_drvdata(radio->videodev, radio);
254 if (video_register_device(radio->videodev, VFL_TYPE_RADIO,
256 warn("Could not register video device");
257 video_device_release(radio->videodev);
261 usb_set_intfdata(intf, radio);
265 /* handle unplugging of the device, release data structures
266 if nothing keeps us from doing it. If something is still
267 keeping us busy, the release callback of v4l will take care
268 of releasing it. stv680.c does not relase its private
269 data, so I don't do this here either. Checking out the
270 code I'd expect I better did that, but if there's a memory
271 leak here it's tiny (~50 bytes per disconnect) */
272 static void usb_dsbr100_disconnect(struct usb_interface *intf)
274 dsbr100_device *radio = usb_get_intfdata(intf);
276 usb_set_intfdata (intf, NULL);
278 video_unregister_device(radio->videodev);
279 radio->videodev = NULL;
289 /* Video for Linux interface */
291 static int usb_dsbr100_do_ioctl(struct inode *inode, struct file *file,
292 unsigned int cmd, void *arg)
294 dsbr100_device *radio=video_get_drvdata(video_devdata(file));
301 struct video_capability *v = arg;
303 memset(v, 0, sizeof(*v));
304 v->type = VID_TYPE_TUNER;
307 strcpy(v->name, "D-Link R-100 USB FM Radio");
311 struct video_tuner *v = arg;
313 dsbr100_getstat(radio);
314 if(v->tuner) /* Only 1 tuner */
316 v->rangelow = FREQ_MIN*FREQ_MUL;
317 v->rangehigh = FREQ_MAX*FREQ_MUL;
318 v->flags = VIDEO_TUNER_LOW;
319 v->mode = VIDEO_MODE_AUTO;
320 v->signal = radio->stereo*0x7000;
321 /* Don't know how to get signal strength */
322 v->flags |= VIDEO_TUNER_STEREO_ON*radio->stereo;
323 strcpy(v->name, "DSB R-100");
327 struct video_tuner *v = arg;
331 /* Only 1 tuner so no setting needed ! */
337 if (radio->curfreq==-1)
339 *freq = radio->curfreq;
345 radio->curfreq = *freq;
346 if (dsbr100_setfreq(radio, radio->curfreq)==-1)
347 warn("Set frequency failed");
351 struct video_audio *v = arg;
353 memset(v, 0, sizeof(*v));
354 v->flags |= VIDEO_AUDIO_MUTABLE;
355 v->mode = VIDEO_SOUND_STEREO;
358 strcpy(v->name, "Radio");
362 struct video_audio *v = arg;
366 if (v->flags&VIDEO_AUDIO_MUTE) {
367 if (dsbr100_stop(radio)==-1)
368 warn("Radio did not respond properly");
371 if (dsbr100_start(radio)==-1)
372 warn("Radio did not respond properly");
380 static int usb_dsbr100_ioctl(struct inode *inode, struct file *file,
381 unsigned int cmd, unsigned long arg)
383 return video_usercopy(inode, file, cmd, arg, usb_dsbr100_do_ioctl);
386 static int usb_dsbr100_open(struct inode *inode, struct file *file)
388 dsbr100_device *radio=video_get_drvdata(video_devdata(file));
391 if (dsbr100_start(radio)<0) {
392 warn("Radio did not start up properly");
396 dsbr100_setfreq(radio, radio->curfreq);
400 static int usb_dsbr100_close(struct inode *inode, struct file *file)
402 dsbr100_device *radio=video_get_drvdata(video_devdata(file));
407 if (radio->removed) {
413 static int __init dsbr100_init(void)
415 int retval = usb_register(&usb_dsbr100_driver);
416 info(DRIVER_VERSION ":" DRIVER_DESC);
420 static void __exit dsbr100_exit(void)
422 usb_deregister(&usb_dsbr100_driver);
425 module_init (dsbr100_init);
426 module_exit (dsbr100_exit);
428 MODULE_AUTHOR( DRIVER_AUTHOR );
429 MODULE_DESCRIPTION( DRIVER_DESC );
430 MODULE_LICENSE("GPL");