433 lines
12 KiB
C
433 lines
12 KiB
C
/* A driver for the D-Link DSB-R100 USB radio and Gemtek USB Radio 21.
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* The device plugs 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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*
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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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*
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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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*
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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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*
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* Fully tested with the Keene USB FM Transmitter and the v4l2-compliance tool.
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*
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* Copyright (c) 2000 Markus Demleitner <msdemlei@cl.uni-heidelberg.de>
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*
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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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*
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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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*
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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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*/
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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/videodev2.h>
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#include <linux/usb.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-ioctl.h>
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#include <media/v4l2-ctrls.h>
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#include <media/v4l2-event.h>
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/*
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* Version Information
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*/
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MODULE_AUTHOR("Markus Demleitner <msdemlei@tucana.harvard.edu>");
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MODULE_DESCRIPTION("D-Link DSB-R100 USB FM radio driver");
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MODULE_LICENSE("GPL");
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MODULE_VERSION("1.1.0");
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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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#define v4l2_dev_to_radio(d) container_of(d, struct dsbr100_device, v4l2_dev)
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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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struct dsbr100_device {
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struct usb_device *usbdev;
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struct video_device videodev;
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struct v4l2_device v4l2_dev;
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struct v4l2_ctrl_handler hdl;
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u8 *transfer_buffer;
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struct mutex v4l2_lock;
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int curfreq;
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bool stereo;
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bool muted;
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};
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/* Low-level device interface begins here */
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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(struct dsbr100_device *radio, unsigned freq)
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{
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unsigned f = (freq / 16 * 80) / 1000 + 856;
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int retval = 0;
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if (!radio->muted) {
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retval = usb_control_msg(radio->usbdev,
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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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(f >> 8) & 0x00ff, f & 0xff,
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radio->transfer_buffer, 8, 300);
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if (retval >= 0)
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mdelay(1);
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}
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if (retval >= 0) {
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radio->curfreq = freq;
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return 0;
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}
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dev_err(&radio->usbdev->dev,
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"%s - usb_control_msg returned %i, request %i\n",
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__func__, retval, DSB100_TUNE);
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return retval;
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}
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/* switch on radio */
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static int dsbr100_start(struct dsbr100_device *radio)
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{
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int retval = usb_control_msg(radio->usbdev,
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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);
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if (retval >= 0)
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return dsbr100_setfreq(radio, radio->curfreq);
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dev_err(&radio->usbdev->dev,
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"%s - usb_control_msg returned %i, request %i\n",
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__func__, retval, DSB100_ONOFF);
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return retval;
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}
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/* switch off radio */
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static int dsbr100_stop(struct dsbr100_device *radio)
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{
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int retval = usb_control_msg(radio->usbdev,
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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);
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if (retval >= 0)
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return 0;
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dev_err(&radio->usbdev->dev,
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"%s - usb_control_msg returned %i, request %i\n",
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__func__, retval, DSB100_ONOFF);
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return retval;
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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(struct dsbr100_device *radio)
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{
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int retval = usb_control_msg(radio->usbdev,
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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);
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if (retval < 0) {
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radio->stereo = false;
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dev_err(&radio->usbdev->dev,
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"%s - usb_control_msg returned %i, request %i\n",
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__func__, retval, USB_REQ_GET_STATUS);
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} else {
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radio->stereo = !(radio->transfer_buffer[0] & 0x01);
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}
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}
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static int vidioc_querycap(struct file *file, void *priv,
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struct v4l2_capability *v)
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{
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struct dsbr100_device *radio = video_drvdata(file);
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strlcpy(v->driver, "dsbr100", sizeof(v->driver));
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strlcpy(v->card, "D-Link R-100 USB FM Radio", sizeof(v->card));
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usb_make_path(radio->usbdev, v->bus_info, sizeof(v->bus_info));
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v->device_caps = V4L2_CAP_RADIO | V4L2_CAP_TUNER;
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v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS;
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return 0;
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}
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static int vidioc_g_tuner(struct file *file, void *priv,
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struct v4l2_tuner *v)
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{
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struct dsbr100_device *radio = video_drvdata(file);
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if (v->index > 0)
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return -EINVAL;
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dsbr100_getstat(radio);
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strcpy(v->name, "FM");
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v->type = V4L2_TUNER_RADIO;
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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->rxsubchans = radio->stereo ? V4L2_TUNER_SUB_STEREO :
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V4L2_TUNER_SUB_MONO;
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v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
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v->audmode = V4L2_TUNER_MODE_STEREO;
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v->signal = radio->stereo ? 0xffff : 0; /* We can't get the signal strength */
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return 0;
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}
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static int vidioc_s_tuner(struct file *file, void *priv,
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const struct v4l2_tuner *v)
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{
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return v->index ? -EINVAL : 0;
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}
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static int vidioc_s_frequency(struct file *file, void *priv,
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const struct v4l2_frequency *f)
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{
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struct dsbr100_device *radio = video_drvdata(file);
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if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
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return -EINVAL;
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return dsbr100_setfreq(radio, clamp_t(unsigned, f->frequency,
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FREQ_MIN * FREQ_MUL, FREQ_MAX * FREQ_MUL));
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}
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static int vidioc_g_frequency(struct file *file, void *priv,
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struct v4l2_frequency *f)
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{
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struct dsbr100_device *radio = video_drvdata(file);
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if (f->tuner)
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return -EINVAL;
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f->type = V4L2_TUNER_RADIO;
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f->frequency = radio->curfreq;
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return 0;
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}
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static int usb_dsbr100_s_ctrl(struct v4l2_ctrl *ctrl)
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{
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struct dsbr100_device *radio =
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container_of(ctrl->handler, struct dsbr100_device, hdl);
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switch (ctrl->id) {
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case V4L2_CID_AUDIO_MUTE:
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radio->muted = ctrl->val;
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return radio->muted ? dsbr100_stop(radio) : dsbr100_start(radio);
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}
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return -EINVAL;
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}
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/* USB subsystem interface begins here */
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/*
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* Handle unplugging of the device.
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* We call video_unregister_device in any case.
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* The last function called in this procedure is
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* usb_dsbr100_video_device_release
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*/
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static void usb_dsbr100_disconnect(struct usb_interface *intf)
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{
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struct dsbr100_device *radio = usb_get_intfdata(intf);
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mutex_lock(&radio->v4l2_lock);
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/*
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* Disconnect is also called on unload, and in that case we need to
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* mute the device. This call will silently fail if it is called
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* after a physical disconnect.
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*/
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usb_control_msg(radio->usbdev,
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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);
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usb_set_intfdata(intf, NULL);
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video_unregister_device(&radio->videodev);
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v4l2_device_disconnect(&radio->v4l2_dev);
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mutex_unlock(&radio->v4l2_lock);
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v4l2_device_put(&radio->v4l2_dev);
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}
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/* Suspend device - stop device. */
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static int usb_dsbr100_suspend(struct usb_interface *intf, pm_message_t message)
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{
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struct dsbr100_device *radio = usb_get_intfdata(intf);
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mutex_lock(&radio->v4l2_lock);
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if (!radio->muted && dsbr100_stop(radio) < 0)
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dev_warn(&intf->dev, "dsbr100_stop failed\n");
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mutex_unlock(&radio->v4l2_lock);
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dev_info(&intf->dev, "going into suspend..\n");
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return 0;
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}
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/* Resume device - start device. */
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static int usb_dsbr100_resume(struct usb_interface *intf)
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{
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struct dsbr100_device *radio = usb_get_intfdata(intf);
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mutex_lock(&radio->v4l2_lock);
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if (!radio->muted && dsbr100_start(radio) < 0)
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dev_warn(&intf->dev, "dsbr100_start failed\n");
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mutex_unlock(&radio->v4l2_lock);
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dev_info(&intf->dev, "coming out of suspend..\n");
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return 0;
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}
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/* free data structures */
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static void usb_dsbr100_release(struct v4l2_device *v4l2_dev)
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{
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struct dsbr100_device *radio = v4l2_dev_to_radio(v4l2_dev);
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v4l2_ctrl_handler_free(&radio->hdl);
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v4l2_device_unregister(&radio->v4l2_dev);
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kfree(radio->transfer_buffer);
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kfree(radio);
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}
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static const struct v4l2_ctrl_ops usb_dsbr100_ctrl_ops = {
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.s_ctrl = usb_dsbr100_s_ctrl,
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};
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/* File system interface */
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static const struct v4l2_file_operations usb_dsbr100_fops = {
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.owner = THIS_MODULE,
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.unlocked_ioctl = video_ioctl2,
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.open = v4l2_fh_open,
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.release = v4l2_fh_release,
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.poll = v4l2_ctrl_poll,
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};
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static const struct v4l2_ioctl_ops usb_dsbr100_ioctl_ops = {
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.vidioc_querycap = vidioc_querycap,
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.vidioc_g_tuner = vidioc_g_tuner,
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.vidioc_s_tuner = vidioc_s_tuner,
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.vidioc_g_frequency = vidioc_g_frequency,
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.vidioc_s_frequency = vidioc_s_frequency,
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.vidioc_log_status = v4l2_ctrl_log_status,
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.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
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.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
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};
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/* check if the device is present and register with v4l and 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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struct dsbr100_device *radio;
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struct v4l2_device *v4l2_dev;
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int retval;
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radio = kzalloc(sizeof(struct dsbr100_device), GFP_KERNEL);
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if (!radio)
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return -ENOMEM;
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radio->transfer_buffer = kmalloc(TB_LEN, GFP_KERNEL);
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if (!(radio->transfer_buffer)) {
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kfree(radio);
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return -ENOMEM;
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}
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v4l2_dev = &radio->v4l2_dev;
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v4l2_dev->release = usb_dsbr100_release;
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retval = v4l2_device_register(&intf->dev, v4l2_dev);
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if (retval < 0) {
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v4l2_err(v4l2_dev, "couldn't register v4l2_device\n");
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goto err_reg_dev;
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}
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v4l2_ctrl_handler_init(&radio->hdl, 1);
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v4l2_ctrl_new_std(&radio->hdl, &usb_dsbr100_ctrl_ops,
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V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
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if (radio->hdl.error) {
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retval = radio->hdl.error;
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v4l2_err(v4l2_dev, "couldn't register control\n");
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goto err_reg_ctrl;
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}
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mutex_init(&radio->v4l2_lock);
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strlcpy(radio->videodev.name, v4l2_dev->name, sizeof(radio->videodev.name));
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radio->videodev.v4l2_dev = v4l2_dev;
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radio->videodev.fops = &usb_dsbr100_fops;
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radio->videodev.ioctl_ops = &usb_dsbr100_ioctl_ops;
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radio->videodev.release = video_device_release_empty;
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radio->videodev.lock = &radio->v4l2_lock;
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radio->videodev.ctrl_handler = &radio->hdl;
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radio->usbdev = interface_to_usbdev(intf);
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radio->curfreq = FREQ_MIN * FREQ_MUL;
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radio->muted = true;
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video_set_drvdata(&radio->videodev, radio);
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usb_set_intfdata(intf, radio);
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retval = video_register_device(&radio->videodev, VFL_TYPE_RADIO, radio_nr);
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if (retval == 0)
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return 0;
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v4l2_err(v4l2_dev, "couldn't register video device\n");
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err_reg_ctrl:
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v4l2_ctrl_handler_free(&radio->hdl);
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v4l2_device_unregister(v4l2_dev);
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err_reg_dev:
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kfree(radio->transfer_buffer);
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kfree(radio);
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return retval;
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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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.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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.suspend = usb_dsbr100_suspend,
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.resume = usb_dsbr100_resume,
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.reset_resume = usb_dsbr100_resume,
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};
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module_usb_driver(usb_dsbr100_driver);
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