1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
430 lines
12 KiB
C
430 lines
12 KiB
C
/* A driver for the D-Link DSB-R100 USB radio. The R100 plugs
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into both the USB and an analog audio input, so this thing
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only deals with initialisation and frequency setting, the
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audio data has to be handled by a sound driver.
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Major issue: I can't find out where the device reports the signal
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strength, and indeed the windows software appearantly just looks
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at the stereo indicator as well. So, scanning will only find
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stereo stations. Sad, but I can't help it.
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Also, the windows program sends oodles of messages over to the
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device, and I couldn't figure out their meaning. My suspicion
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is that they don't have any:-)
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You might find some interesting stuff about this module at
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http://unimut.fsk.uni-heidelberg.de/unimut/demi/dsbr
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Copyright (c) 2000 Markus Demleitner <msdemlei@cl.uni-heidelberg.de>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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History:
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Version 0.40:
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Markus: Updates for 2.6.x kernels, code layout changes, name sanitizing
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Version 0.30:
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Markus: Updates for 2.5.x kernel and more ISO compliant source
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Version 0.25:
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PSL and Markus: Cleanup, radio now doesn't stop on device close
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Version 0.24:
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Markus: Hope I got these silly VIDEO_TUNER_LOW issues finally
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right. Some minor cleanup, improved standalone compilation
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Version 0.23:
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Markus: Sign extension bug fixed by declaring transfer_buffer unsigned
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Version 0.22:
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Markus: Some (brown bag) cleanup in what VIDIOCSTUNER returns,
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thanks to Mike Cox for pointing the problem out.
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Version 0.21:
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Markus: Minor cleanup, warnings if something goes wrong, lame attempt
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to adhere to Documentation/CodingStyle
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Version 0.2:
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Brad Hards <bradh@dynamite.com.au>: Fixes to make it work as non-module
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Markus: Copyright clarification
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Version 0.01: Markus: initial release
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/input.h>
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#include <linux/videodev.h>
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#include <linux/usb.h>
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#include <linux/smp_lock.h>
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/*
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* Version Information
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*/
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#define DRIVER_VERSION "v0.40"
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#define DRIVER_AUTHOR "Markus Demleitner <msdemlei@tucana.harvard.edu>"
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#define DRIVER_DESC "D-Link DSB-R100 USB FM radio driver"
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#define DSB100_VENDOR 0x04b4
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#define DSB100_PRODUCT 0x1002
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/* Commands the device appears to understand */
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#define DSB100_TUNE 1
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#define DSB100_ONOFF 2
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#define TB_LEN 16
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/* Frequency limits in MHz -- these are European values. For Japanese
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devices, that would be 76 and 91. */
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#define FREQ_MIN 87.5
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#define FREQ_MAX 108.0
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#define FREQ_MUL 16000
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static int usb_dsbr100_probe(struct usb_interface *intf,
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const struct usb_device_id *id);
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static void usb_dsbr100_disconnect(struct usb_interface *intf);
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static int usb_dsbr100_ioctl(struct inode *inode, struct file *file,
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unsigned int cmd, unsigned long arg);
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static int usb_dsbr100_open(struct inode *inode, struct file *file);
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static int usb_dsbr100_close(struct inode *inode, struct file *file);
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static int radio_nr = -1;
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module_param(radio_nr, int, 0);
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/* Data for one (physical) device */
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typedef struct {
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struct usb_device *usbdev;
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struct video_device *videodev;
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unsigned char transfer_buffer[TB_LEN];
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int curfreq;
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int stereo;
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int users;
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int removed;
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} dsbr100_device;
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/* File system interface */
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static struct file_operations usb_dsbr100_fops = {
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.owner = THIS_MODULE,
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.open = usb_dsbr100_open,
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.release = usb_dsbr100_close,
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.ioctl = usb_dsbr100_ioctl,
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.llseek = no_llseek,
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};
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/* V4L interface */
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static struct video_device dsbr100_videodev_template=
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{
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.owner = THIS_MODULE,
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.name = "D-Link DSB-R 100",
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.type = VID_TYPE_TUNER,
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.hardware = VID_HARDWARE_AZTECH,
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.fops = &usb_dsbr100_fops,
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.release = video_device_release,
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};
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static struct usb_device_id usb_dsbr100_device_table [] = {
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{ USB_DEVICE(DSB100_VENDOR, DSB100_PRODUCT) },
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{ } /* Terminating entry */
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};
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MODULE_DEVICE_TABLE (usb, usb_dsbr100_device_table);
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/* USB subsystem interface */
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static struct usb_driver usb_dsbr100_driver = {
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.owner = THIS_MODULE,
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.name = "dsbr100",
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.probe = usb_dsbr100_probe,
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.disconnect = usb_dsbr100_disconnect,
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.id_table = usb_dsbr100_device_table,
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};
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/* Low-level device interface begins here */
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/* switch on radio */
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static int dsbr100_start(dsbr100_device *radio)
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{
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if (usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
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USB_REQ_GET_STATUS,
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USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
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0x00, 0xC7, radio->transfer_buffer, 8, 300)<0 ||
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usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
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DSB100_ONOFF,
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USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
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0x01, 0x00, radio->transfer_buffer, 8, 300)<0)
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return -1;
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return (radio->transfer_buffer)[0];
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}
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/* switch off radio */
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static int dsbr100_stop(dsbr100_device *radio)
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{
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if (usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
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USB_REQ_GET_STATUS,
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USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
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0x16, 0x1C, radio->transfer_buffer, 8, 300)<0 ||
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usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
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DSB100_ONOFF,
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USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
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0x00, 0x00, radio->transfer_buffer, 8, 300)<0)
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return -1;
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return (radio->transfer_buffer)[0];
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}
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/* set a frequency, freq is defined by v4l's TUNER_LOW, i.e. 1/16th kHz */
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static int dsbr100_setfreq(dsbr100_device *radio, int freq)
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{
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freq = (freq/16*80)/1000+856;
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if (usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
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DSB100_TUNE,
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USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
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(freq>>8)&0x00ff, freq&0xff,
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radio->transfer_buffer, 8, 300)<0 ||
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usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
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USB_REQ_GET_STATUS,
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USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
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0x96, 0xB7, radio->transfer_buffer, 8, 300)<0 ||
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usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
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USB_REQ_GET_STATUS,
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USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
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0x00, 0x24, radio->transfer_buffer, 8, 300)<0) {
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radio->stereo = -1;
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return -1;
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}
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radio->stereo = ! ((radio->transfer_buffer)[0]&0x01);
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return (radio->transfer_buffer)[0];
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}
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/* return the device status. This is, in effect, just whether it
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sees a stereo signal or not. Pity. */
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static void dsbr100_getstat(dsbr100_device *radio)
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{
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if (usb_control_msg(radio->usbdev, usb_rcvctrlpipe(radio->usbdev, 0),
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USB_REQ_GET_STATUS,
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USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
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0x00 , 0x24, radio->transfer_buffer, 8, 300)<0)
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radio->stereo = -1;
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else
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radio->stereo = ! (radio->transfer_buffer[0]&0x01);
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}
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/* USB subsystem interface begins here */
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/* check if the device is present and register with v4l and
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usb if it is */
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static int usb_dsbr100_probe(struct usb_interface *intf,
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const struct usb_device_id *id)
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{
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dsbr100_device *radio;
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if (!(radio = kmalloc(sizeof(dsbr100_device), GFP_KERNEL)))
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return -ENOMEM;
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if (!(radio->videodev = video_device_alloc())) {
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kfree(radio);
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return -ENOMEM;
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}
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memcpy(radio->videodev, &dsbr100_videodev_template,
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sizeof(dsbr100_videodev_template));
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radio->removed = 0;
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radio->users = 0;
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radio->usbdev = interface_to_usbdev(intf);
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radio->curfreq = FREQ_MIN*FREQ_MUL;
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video_set_drvdata(radio->videodev, radio);
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if (video_register_device(radio->videodev, VFL_TYPE_RADIO,
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radio_nr)) {
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warn("Could not register video device");
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video_device_release(radio->videodev);
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kfree(radio);
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return -EIO;
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}
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usb_set_intfdata(intf, radio);
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return 0;
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}
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/* handle unplugging of the device, release data structures
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if nothing keeps us from doing it. If something is still
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keeping us busy, the release callback of v4l will take care
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of releasing it. stv680.c does not relase its private
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data, so I don't do this here either. Checking out the
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code I'd expect I better did that, but if there's a memory
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leak here it's tiny (~50 bytes per disconnect) */
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static void usb_dsbr100_disconnect(struct usb_interface *intf)
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{
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dsbr100_device *radio = usb_get_intfdata(intf);
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usb_set_intfdata (intf, NULL);
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if (radio) {
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video_unregister_device(radio->videodev);
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radio->videodev = NULL;
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if (radio->users) {
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kfree(radio);
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} else {
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radio->removed = 1;
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}
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}
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}
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/* Video for Linux interface */
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static int usb_dsbr100_do_ioctl(struct inode *inode, struct file *file,
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unsigned int cmd, void *arg)
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{
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dsbr100_device *radio=video_get_drvdata(video_devdata(file));
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if (!radio)
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return -EIO;
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switch(cmd) {
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case VIDIOCGCAP: {
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struct video_capability *v = arg;
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memset(v, 0, sizeof(*v));
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v->type = VID_TYPE_TUNER;
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v->channels = 1;
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v->audios = 1;
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strcpy(v->name, "D-Link R-100 USB FM Radio");
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return 0;
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}
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case VIDIOCGTUNER: {
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struct video_tuner *v = arg;
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dsbr100_getstat(radio);
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if(v->tuner) /* Only 1 tuner */
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return -EINVAL;
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v->rangelow = FREQ_MIN*FREQ_MUL;
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v->rangehigh = FREQ_MAX*FREQ_MUL;
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v->flags = VIDEO_TUNER_LOW;
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v->mode = VIDEO_MODE_AUTO;
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v->signal = radio->stereo*0x7000;
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/* Don't know how to get signal strength */
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v->flags |= VIDEO_TUNER_STEREO_ON*radio->stereo;
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strcpy(v->name, "DSB R-100");
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return 0;
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}
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case VIDIOCSTUNER: {
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struct video_tuner *v = arg;
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if(v->tuner!=0)
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return -EINVAL;
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/* Only 1 tuner so no setting needed ! */
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return 0;
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}
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case VIDIOCGFREQ: {
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int *freq = arg;
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if (radio->curfreq==-1)
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return -EINVAL;
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*freq = radio->curfreq;
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return 0;
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}
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case VIDIOCSFREQ: {
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int *freq = arg;
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radio->curfreq = *freq;
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if (dsbr100_setfreq(radio, radio->curfreq)==-1)
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warn("Set frequency failed");
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return 0;
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}
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case VIDIOCGAUDIO: {
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struct video_audio *v = arg;
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memset(v, 0, sizeof(*v));
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v->flags |= VIDEO_AUDIO_MUTABLE;
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v->mode = VIDEO_SOUND_STEREO;
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v->volume = 1;
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v->step = 1;
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strcpy(v->name, "Radio");
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return 0;
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}
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case VIDIOCSAUDIO: {
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struct video_audio *v = arg;
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if (v->audio)
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return -EINVAL;
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if (v->flags&VIDEO_AUDIO_MUTE) {
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if (dsbr100_stop(radio)==-1)
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warn("Radio did not respond properly");
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}
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else
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if (dsbr100_start(radio)==-1)
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warn("Radio did not respond properly");
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return 0;
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}
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default:
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return -ENOIOCTLCMD;
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}
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}
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static int usb_dsbr100_ioctl(struct inode *inode, struct file *file,
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unsigned int cmd, unsigned long arg)
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{
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return video_usercopy(inode, file, cmd, arg, usb_dsbr100_do_ioctl);
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}
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static int usb_dsbr100_open(struct inode *inode, struct file *file)
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{
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dsbr100_device *radio=video_get_drvdata(video_devdata(file));
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radio->users = 1;
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if (dsbr100_start(radio)<0) {
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warn("Radio did not start up properly");
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radio->users = 0;
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return -EIO;
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}
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dsbr100_setfreq(radio, radio->curfreq);
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return 0;
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}
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static int usb_dsbr100_close(struct inode *inode, struct file *file)
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{
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dsbr100_device *radio=video_get_drvdata(video_devdata(file));
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if (!radio)
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return -ENODEV;
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radio->users = 0;
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if (radio->removed) {
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kfree(radio);
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}
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return 0;
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}
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static int __init dsbr100_init(void)
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{
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int retval = usb_register(&usb_dsbr100_driver);
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info(DRIVER_VERSION ":" DRIVER_DESC);
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return retval;
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}
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static void __exit dsbr100_exit(void)
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{
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usb_deregister(&usb_dsbr100_driver);
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}
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module_init (dsbr100_init);
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module_exit (dsbr100_exit);
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MODULE_AUTHOR( DRIVER_AUTHOR );
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MODULE_DESCRIPTION( DRIVER_DESC );
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MODULE_LICENSE("GPL");
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