/* A driver for the D-Link DSB-R100 USB radio and Gemtek USB Radio 21.
* The device 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
*
* Fully tested with the Keene USB FM Transmitter and the v4l2-compliance tool.
*
* Copyright (c) 2000 Markus Demleitner <msdemlei@cl.uni-heidelberg.de>
*
* 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.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/videodev2.h>
#include <linux/usb.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-event.h>
/*
* Version Information
*/
MODULE_AUTHOR("Markus Demleitner <msdemlei@tucana.harvard.edu>");
MODULE_DESCRIPTION("D-Link DSB-R100 USB FM radio driver");
MODULE_LICENSE("GPL");
MODULE_VERSION("1.1.0");
#define DSB100_VENDOR 0x04b4
#define DSB100_PRODUCT 0x1002
/* Commands the device appears to understand */
#define DSB100_TUNE 1
#define DSB100_ONOFF 2
#define TB_LEN 16
/* Frequency limits in MHz -- these are European values. For Japanese
devices, that would be 76 and 91. */
#define FREQ_MIN 87.5
#define FREQ_MAX 108.0
#define FREQ_MUL 16000
#define v4l2_dev_to_radio(d) container_of(d, struct dsbr100_device, v4l2_dev)
static int radio_nr = -1;
module_param(radio_nr, int, 0);
/* Data for one (physical) device */
struct dsbr100_device {
struct usb_device *usbdev;
struct video_device videodev;
struct v4l2_device v4l2_dev;
struct v4l2_ctrl_handler hdl;
u8 *transfer_buffer;
struct mutex v4l2_lock;
int curfreq;
bool stereo;
bool muted;
};
/* Low-level device interface begins here */
/* set a frequency, freq is defined by v4l's TUNER_LOW, i.e. 1/16th kHz */
static int dsbr100_setfreq(struct dsbr100_device *radio, unsigned freq)
{
unsigned f = (freq / 16 * 80) / 1000 + 856;
int retval = 0;
if (!radio->muted) {
retval = usb_control_msg(radio->usbdev,
usb_rcvctrlpipe(radio->usbdev, 0),
DSB100_TUNE,
USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
(f >> 8) & 0x00ff, f & 0xff,
radio->transfer_buffer, 8, 300);
if (retval >= 0)
mdelay(1);
}
if (retval >= 0) {
radio->curfreq = freq;
return 0;
}
dev_err(&radio->usbdev->dev,
"%s - usb_control_msg returned %i, request %i\n",
__func__, retval, DSB100_TUNE);
return retval;
}
/* switch on radio */
static int dsbr100_start(struct dsbr100_device *radio)
{
int retval = usb_control_msg(radio->usbdev,
usb_rcvctrlpipe(radio->usbdev, 0),
DSB100_ONOFF,
USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
0x01, 0x00, radio->transfer_buffer, 8, 300);
if (retval >= 0)
return dsbr100_setfreq(radio, radio->curfreq);
dev_err(&radio->usbdev->dev,
"%s - usb_control_msg returned %i, request %i\n",
__func__, retval, DSB100_ONOFF);
return retval;
}
/* switch off radio */
static int dsbr100_stop(struct dsbr100_device *radio)
{
int retval = usb_control_msg(radio->usbdev,
usb_rcvctrlpipe(radio->usbdev, 0),
DSB100_ONOFF,
USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
0x00, 0x00, radio->transfer_buffer, 8, 300);
if (retval >= 0)
return 0;
dev_err(&radio->usbdev->dev,
"%s - usb_control_msg returned %i, request %i\n",
__func__, retval, DSB100_ONOFF);
return retval;
}
/* return the device status. This is, in effect, just whether it
sees a stereo signal or not. Pity. */
static void dsbr100_getstat(struct dsbr100_device *radio)
{
int retval = usb_control_msg(radio->usbdev,
usb_rcvctrlpipe(radio->usbdev, 0),
USB_REQ_GET_STATUS,
USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
0x00, 0x24, radio->transfer_buffer, 8, 300);
if (retval < 0) {
radio->stereo = false;
dev_err(&radio->usbdev->dev,
"%s - usb_control_msg returned %i, request %i\n",
__func__, retval, USB_REQ_GET_STATUS);
} else {
radio->stereo = !(radio->transfer_buffer[0] & 0x01);
}
}
static int vidioc_querycap(struct file *file, void *priv,
struct v4l2_capability *v)
{
struct dsbr100_device *radio = video_drvdata(file);
strlcpy(v->driver, "dsbr100", sizeof(v->driver));
strlcpy(v->card, "D-Link R-100 USB FM Radio", sizeof(v->card));
usb_make_path(radio->usbdev, v->bus_info, sizeof(v->bus_info));
v->device_caps = V4L2_CAP_RADIO | V4L2_CAP_TUNER;
v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS;
return 0;
}
static int vidioc_g_tuner(struct file *file, void *priv,
struct v4l2_tuner *v)
{
struct dsbr100_device *radio = video_drvdata(file);
if (v->index > 0)
return -EINVAL;
dsbr100_getstat(radio);
strcpy(v->name, "FM");
v->type = V4L2_TUNER_RADIO;
v->rangelow = FREQ_MIN * FREQ_MUL;
v->rangehigh = FREQ_MAX * FREQ_MUL;
v->rxsubchans = radio->stereo ? V4L2_TUNER_SUB_STEREO :
V4L2_TUNER_SUB_MONO;
v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
v->audmode = V4L2_TUNER_MODE_STEREO;
v->signal = radio->stereo ? 0xffff : 0; /* We can't get the signal strength */
return 0;
}
static int vidioc_s_tuner(struct file *file, void *priv,
const struct v4l2_tuner *v)
{
return v->index ? -EINVAL : 0;
}
static int vidioc_s_frequency(struct file *file, void *priv,
const struct v4l2_frequency *f)
{
struct dsbr100_device *radio = video_drvdata(file);
if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
return -EINVAL;
return dsbr100_setfreq(radio, clamp_t(unsigned, f->frequency,
FREQ_MIN * FREQ_MUL, FREQ_MAX * FREQ_MUL));
}
static int vidioc_g_frequency(struct file *file, void *priv,
struct v4l2_frequency *f)
{
struct dsbr100_device *radio = video_drvdata(file);
if (f->tuner)
return -EINVAL;
f->type = V4L2_TUNER_RADIO;
f->frequency = radio->curfreq;
return 0;
}
static int usb_dsbr100_s_ctrl(struct v4l2_ctrl *ctrl)
{
struct dsbr100_device *radio =
container_of(ctrl->handler, struct dsbr100_device, hdl);
switch (ctrl->id) {
case V4L2_CID_AUDIO_MUTE:
radio->muted = ctrl->val;
return radio->muted ? dsbr100_stop(radio) : dsbr100_start(radio);
}
return -EINVAL;
}
/* USB subsystem interface begins here */
/*
* Handle unplugging of the device.
* We call video_unregister_device in any case.
* The last function called in this procedure is
* usb_dsbr100_video_device_release
*/
static void usb_dsbr100_disconnect(struct usb_interface *intf)
{
struct dsbr100_device *radio = usb_get_intfdata(intf);
mutex_lock(&radio->v4l2_lock);
/*
* Disconnect is also called on unload, and in that case we need to
* mute the device. This call will silently fail if it is called
* after a physical disconnect.
*/
usb_control_msg(radio->usbdev,
usb_rcvctrlpipe(radio->usbdev, 0),
DSB100_ONOFF,
USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
0x00, 0x00, radio->transfer_buffer, 8, 300);
usb_set_intfdata(intf, NULL);
video_unregister_device(&radio->videodev);
v4l2_device_disconnect(&radio->v4l2_dev);
mutex_unlock(&radio->v4l2_lock);
v4l2_device_put(&radio->v4l2_dev);
}
/* Suspend device - stop device. */
static int usb_dsbr100_suspend(struct usb_interface *intf, pm_message_t message)
{
struct dsbr100_device *radio = usb_get_intfdata(intf);
mutex_lock(&radio->v4l2_lock);
if (!radio->muted && dsbr100_stop(radio) < 0)
dev_warn(&intf->dev, "dsbr100_stop failed\n");
mutex_unlock(&radio->v4l2_lock);
dev_info(&intf->dev, "going into suspend..\n");
return 0;
}
/* Resume device - start device. */
static int usb_dsbr100_resume(struct usb_interface *intf)
{
struct dsbr100_device *radio = usb_get_intfdata(intf);
mutex_lock(&radio->v4l2_lock);
if (!radio->muted && dsbr100_start(radio) < 0)
dev_warn(&intf->dev, "dsbr100_start failed\n");
mutex_unlock(&radio->v4l2_lock);
dev_info(&intf->dev, "coming out of suspend..\n");
return 0;
}
/* free data structures */
static void usb_dsbr100_release(struct v4l2_device *v4l2_dev)
{
struct dsbr100_device *radio = v4l2_dev_to_radio(v4l2_dev);
v4l2_ctrl_handler_free(&radio->hdl);
v4l2_device_unregister(&radio->v4l2_dev);
kfree(radio->transfer_buffer);
kfree(radio);
}
static const struct v4l2_ctrl_ops usb_dsbr100_ctrl_ops = {
.s_ctrl = usb_dsbr100_s_ctrl,
};
/* File system interface */
static const struct v4l2_file_operations usb_dsbr100_fops = {
.owner = THIS_MODULE,
.unlocked_ioctl = video_ioctl2,
.open = v4l2_fh_open,
.release = v4l2_fh_release,
.poll = v4l2_ctrl_poll,
};
static const struct v4l2_ioctl_ops usb_dsbr100_ioctl_ops = {
.vidioc_querycap = vidioc_querycap,
.vidioc_g_tuner = vidioc_g_tuner,
.vidioc_s_tuner = vidioc_s_tuner,
.vidioc_g_frequency = vidioc_g_frequency,
.vidioc_s_frequency = vidioc_s_frequency,
.vidioc_log_status = v4l2_ctrl_log_status,
.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
};
/* check if the device is present and register with v4l and usb if it is */
static int usb_dsbr100_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
struct dsbr100_device *radio;
struct v4l2_device *v4l2_dev;
int retval;
radio = kzalloc(sizeof(struct dsbr100_device), GFP_KERNEL);
if (!radio)
return -ENOMEM;
radio->transfer_buffer = kmalloc(TB_LEN, GFP_KERNEL);
if (!(radio->transfer_buffer)) {
kfree(radio);
return -ENOMEM;
}
v4l2_dev = &radio->v4l2_dev;
v4l2_dev->release = usb_dsbr100_release;
retval = v4l2_device_register(&intf->dev, v4l2_dev);
if (retval < 0) {
v4l2_err(v4l2_dev, "couldn't register v4l2_device\n");
goto err_reg_dev;
}
v4l2_ctrl_handler_init(&radio->hdl, 1);
v4l2_ctrl_new_std(&radio->hdl, &usb_dsbr100_ctrl_ops,
V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
if (radio->hdl.error) {
retval = radio->hdl.error;
v4l2_err(v4l2_dev, "couldn't register control\n");
goto err_reg_ctrl;
}
mutex_init(&radio->v4l2_lock);
strlcpy(radio->videodev.name, v4l2_dev->name, sizeof(radio->videodev.name));
radio->videodev.v4l2_dev = v4l2_dev;
radio->videodev.fops = &usb_dsbr100_fops;
radio->videodev.ioctl_ops = &usb_dsbr100_ioctl_ops;
radio->videodev.release = video_device_release_empty;
radio->videodev.lock = &radio->v4l2_lock;
radio->videodev.ctrl_handler = &radio->hdl;
radio->usbdev = interface_to_usbdev(intf);
radio->curfreq = FREQ_MIN * FREQ_MUL;
radio->muted = true;
video_set_drvdata(&radio->videodev, radio);
usb_set_intfdata(intf, radio);
retval = video_register_device(&radio->videodev, VFL_TYPE_RADIO, radio_nr);
if (retval == 0)
return 0;
v4l2_err(v4l2_dev, "couldn't register video device\n");
err_reg_ctrl:
v4l2_ctrl_handler_free(&radio->hdl);
v4l2_device_unregister(v4l2_dev);
err_reg_dev:
kfree(radio->transfer_buffer);
kfree(radio);
return retval;
}
static const struct usb_device_id usb_dsbr100_device_table[] = {
{ USB_DEVICE(DSB100_VENDOR, DSB100_PRODUCT) },
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, usb_dsbr100_device_table);
/* USB subsystem interface */
static struct usb_driver usb_dsbr100_driver = {
.name = "dsbr100",
.probe = usb_dsbr100_probe,
.disconnect = usb_dsbr100_disconnect,
.id_table = usb_dsbr100_device_table,
.suspend = usb_dsbr100_suspend,
.resume = usb_dsbr100_resume,
.reset_resume = usb_dsbr100_resume,
};
module_usb_driver(usb_dsbr100_driver);
