dsbr100.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:9k
- /* A driver for the D-Link DSB-R100 USB radio. The R100 plugs
- into both the USB and an analog audio input, so this thing
- only deals with initialisation and frequency setting, the
- audio data has to be handled by a sound driver.
- Major issue: I can't find out where the device reports the signal
- strength, and indeed the windows software appearantly just looks
- at the stereo indicator as well. So, scanning will only find
- stereo stations. Sad, but I can't help it.
- Also, the windows program sends oodles of messages over to the
- device, and I couldn't figure out their meaning. My suspicion
- is that they don't have any:-)
- You might find some interesting stuff about this module at
- http://unimut.fsk.uni-heidelberg.de/unimut/demi/dsbr
- Copyright (c) 2000 Markus Demleitner <msdemlei@tucana.harvard.edu>
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- History:
- Version 0.24:
- Markus: Hope I got these silly VIDEO_TUNER_LOW issues finally
- right. Some minor cleanup, improved standalone compilation
- Version 0.23:
- Markus: Sign extension bug fixed by declaring transfer_buffer unsigned
- Version 0.22:
- Markus: Some (brown bag) cleanup in what VIDIOCSTUNER returns,
- thanks to Mike Cox for pointing the problem out.
- Version 0.21:
- Markus: Minor cleanup, warnings if something goes wrong, lame attempt
- to adhere to Documentation/CodingStyle
- Version 0.2:
- Brad Hards <bradh@dynamite.com.au>: Fixes to make it work as non-module
- Markus: Copyright clarification
- Version 0.01: Markus: initial release
- */
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/init.h>
- #include <linux/slab.h>
- #include <linux/input.h>
- #include <linux/videodev.h>
- #include <linux/usb.h>
- #include <linux/smp_lock.h>
- /*
- * Version Information
- */
- #define DRIVER_VERSION "v0.24"
- #define DRIVER_AUTHOR "Markus Demleitner <msdemlei@tucana.harvard.edu>"
- #define DRIVER_DESC "D-Link DSB-R100 USB radio driver"
- #define DSB100_VENDOR 0x04b4
- #define DSB100_PRODUCT 0x1002
- #define TB_LEN 16
- static void *usb_dsbr100_probe(struct usb_device *dev, unsigned int ifnum,
- const struct usb_device_id *id);
- static void usb_dsbr100_disconnect(struct usb_device *dev, void *ptr);
- static int usb_dsbr100_ioctl(struct video_device *dev, unsigned int cmd,
- void *arg);
- static int usb_dsbr100_open(struct video_device *dev, int flags);
- static void usb_dsbr100_close(struct video_device *dev);
- static int radio_nr = -1;
- MODULE_PARM(radio_nr, "i");
- typedef struct
- { struct urb readurb,writeurb;
- struct usb_device *dev;
- unsigned char transfer_buffer[TB_LEN];
- int curfreq;
- int stereo;
- int ifnum;
- } usb_dsbr100;
- static struct video_device usb_dsbr100_radio=
- {
- name: "D-Link DSB R-100 USB radio",
- type: VID_TYPE_TUNER,
- hardware: VID_HARDWARE_AZTECH,
- open: usb_dsbr100_open,
- close: usb_dsbr100_close,
- ioctl: usb_dsbr100_ioctl,
- };
- static int users = 0;
- static struct usb_device_id usb_dsbr100_table [] = {
- { USB_DEVICE(DSB100_VENDOR, DSB100_PRODUCT) },
- { } /* Terminating entry */
- };
- MODULE_DEVICE_TABLE (usb, usb_dsbr100_table);
- static struct usb_driver usb_dsbr100_driver = {
- name: "dsbr100",
- probe: usb_dsbr100_probe,
- disconnect: usb_dsbr100_disconnect,
- fops: NULL,
- minor: 0,
- id_table: usb_dsbr100_table,
- };
- static int dsbr100_start(usb_dsbr100 *radio)
- {
- if (usb_control_msg(radio->dev, usb_rcvctrlpipe(radio->dev, 0),
- 0x00, 0xC0, 0x00, 0xC7, radio->transfer_buffer, 8, 300)<0 ||
- usb_control_msg(radio->dev, usb_rcvctrlpipe(radio->dev, 0),
- 0x02, 0xC0, 0x01, 0x00, radio->transfer_buffer, 8, 300)<0)
- return -1;
- return (radio->transfer_buffer)[0];
- }
- static int dsbr100_stop(usb_dsbr100 *radio)
- {
- if (usb_control_msg(radio->dev, usb_rcvctrlpipe(radio->dev, 0),
- 0x00, 0xC0, 0x16, 0x1C, radio->transfer_buffer, 8, 300)<0 ||
- usb_control_msg(radio->dev, usb_rcvctrlpipe(radio->dev, 0),
- 0x02, 0xC0, 0x00, 0x00, radio->transfer_buffer, 8, 300)<0)
- return -1;
- return (radio->transfer_buffer)[0];
- }
- static int dsbr100_setfreq(usb_dsbr100 *radio, int freq)
- {
- freq = (freq/16*80)/1000+856;
- if (usb_control_msg(radio->dev, usb_rcvctrlpipe(radio->dev, 0),
- 0x01, 0xC0, (freq>>8)&0x00ff, freq&0xff,
- radio->transfer_buffer, 8, 300)<0 ||
- usb_control_msg(radio->dev, usb_rcvctrlpipe(radio->dev, 0),
- 0x00, 0xC0, 0x96, 0xB7, radio->transfer_buffer, 8, 300)<0 ||
- usb_control_msg(radio->dev, usb_rcvctrlpipe(radio->dev, 0),
- 0x00, 0xC0, 0x00, 0x24, radio->transfer_buffer, 8, 300)<0) {
- radio->stereo = -1;
- return -1;
- }
- radio->stereo = ! ((radio->transfer_buffer)[0]&0x01);
- return (radio->transfer_buffer)[0];
- }
- static void dsbr100_getstat(usb_dsbr100 *radio)
- {
- if (usb_control_msg(radio->dev, usb_rcvctrlpipe(radio->dev, 0),
- 0x00, 0xC0, 0x00 , 0x24, radio->transfer_buffer, 8, 300)<0)
- radio->stereo = -1;
- else
- radio->stereo = ! (radio->transfer_buffer[0]&0x01);
- }
- static void *usb_dsbr100_probe(struct usb_device *dev, unsigned int ifnum,
- const struct usb_device_id *id)
- {
- usb_dsbr100 *radio;
- if (!(radio = kmalloc(sizeof(usb_dsbr100),GFP_KERNEL)))
- return NULL;
- usb_dsbr100_radio.priv = radio;
- radio->dev = dev;
- radio->ifnum = ifnum;
- radio->curfreq = 1454000;
- return (void*)radio;
- }
- static void usb_dsbr100_disconnect(struct usb_device *dev, void *ptr)
- {
- usb_dsbr100 *radio=ptr;
- lock_kernel();
- if (users) {
- unlock_kernel();
- return;
- }
- kfree(radio);
- usb_dsbr100_radio.priv = NULL;
- unlock_kernel();
- }
- static int usb_dsbr100_ioctl(struct video_device *dev, unsigned int cmd,
- void *arg)
- {
- usb_dsbr100 *radio=dev->priv;
- if (!radio)
- return -EINVAL;
- switch(cmd)
- {
- case VIDIOCGCAP: {
- struct video_capability v;
- v.type=VID_TYPE_TUNER;
- v.channels=1;
- v.audios=1;
- /* No we don't do pictures */
- v.maxwidth=0;
- v.maxheight=0;
- v.minwidth=0;
- v.minheight=0;
- strcpy(v.name, "D-Link R-100 USB Radio");
- if(copy_to_user(arg,&v,sizeof(v)))
- return -EFAULT;
- return 0;
- }
- case VIDIOCGTUNER: {
- struct video_tuner v;
- dsbr100_getstat(radio);
- if(copy_from_user(&v, arg,sizeof(v))!=0)
- return -EFAULT;
- if(v.tuner) /* Only 1 tuner */
- return -EINVAL;
- v.rangelow = 87*16000;
- v.rangehigh = 108*16000;
- v.flags = VIDEO_TUNER_LOW;
- v.mode = VIDEO_MODE_AUTO;
- v.signal = radio->stereo*0x7000;
- /* Don't know how to get signal strength */
- v.flags |= VIDEO_TUNER_STEREO_ON*radio->stereo;
- strcpy(v.name, "DSB R-100");
- if(copy_to_user(arg,&v, sizeof(v)))
- return -EFAULT;
- return 0;
- }
- case VIDIOCSTUNER: {
- struct video_tuner v;
- if(copy_from_user(&v, arg, sizeof(v)))
- return -EFAULT;
- if(v.tuner!=0)
- return -EINVAL;
- /* Only 1 tuner so no setting needed ! */
- return 0;
- }
- case VIDIOCGFREQ:
- if (radio->curfreq==-1)
- return -EINVAL;
- if(copy_to_user(arg, &(radio->curfreq),
- sizeof(radio->curfreq)))
- return -EFAULT;
- return 0;
- case VIDIOCSFREQ:
- if(copy_from_user(&(radio->curfreq), arg,
- sizeof(radio->curfreq)))
- return -EFAULT;
- if (dsbr100_setfreq(radio, radio->curfreq)==-1)
- warn("set frequency failed");
- return 0;
- case VIDIOCGAUDIO: {
- struct video_audio v;
- memset(&v,0, sizeof(v));
- v.flags|=VIDEO_AUDIO_MUTABLE;
- v.mode=VIDEO_SOUND_STEREO;
- v.volume=1;
- v.step=1;
- strcpy(v.name, "Radio");
- if(copy_to_user(arg,&v, sizeof(v)))
- return -EFAULT;
- return 0;
- }
- case VIDIOCSAUDIO: {
- struct video_audio v;
- if(copy_from_user(&v, arg, sizeof(v)))
- return -EFAULT;
- if(v.audio)
- return -EINVAL;
- if(v.flags&VIDEO_AUDIO_MUTE) {
- if (dsbr100_stop(radio)==-1)
- warn("radio did not respond properly");
- }
- else
- if (dsbr100_start(radio)==-1)
- warn("radio did not respond properly");
- return 0;
- }
- default:
- return -ENOIOCTLCMD;
- }
- }
- static int usb_dsbr100_open(struct video_device *dev, int flags)
- {
- usb_dsbr100 *radio=dev->priv;
- if (! radio) {
- warn("radio not initialised");
- return -EAGAIN;
- }
- if(users)
- {
- warn("radio in use");
- return -EBUSY;
- }
- users++;
- MOD_INC_USE_COUNT;
- if (dsbr100_start(radio)<0)
- warn("radio did not start up properly");
- dsbr100_setfreq(radio,radio->curfreq);
- return 0;
- }
- static void usb_dsbr100_close(struct video_device *dev)
- {
- usb_dsbr100 *radio=dev->priv;
- if (!radio)
- return;
- users--;
- dsbr100_stop(radio);
- MOD_DEC_USE_COUNT;
- }
- static int __init dsbr100_init(void)
- {
- usb_dsbr100_radio.priv = NULL;
- usb_register(&usb_dsbr100_driver);
- if (video_register_device(&usb_dsbr100_radio,VFL_TYPE_RADIO,radio_nr)==-1) {
- warn("couldn't register video device");
- return -EINVAL;
- }
- info(DRIVER_VERSION ":" DRIVER_DESC);
- return 0;
- }
- static void __exit dsbr100_exit(void)
- {
- usb_dsbr100 *radio=usb_dsbr100_radio.priv;
- if (radio)
- dsbr100_stop(radio);
- video_unregister_device(&usb_dsbr100_radio);
- usb_deregister(&usb_dsbr100_driver);
- }
- module_init (dsbr100_init);
- module_exit (dsbr100_exit);
- MODULE_AUTHOR( DRIVER_AUTHOR );
- MODULE_DESCRIPTION( DRIVER_DESC );
- MODULE_LICENSE("GPL");
- /*
- vi: ts=8
- Sigh. Of course, I am one of the ts=2 heretics, but Linus' wish is
- my command.
- */