1 files changed, 420 insertions, 0 deletions
diff --git a/drivers/media/radio/dsbr100.c b/drivers/media/radio/dsbr100.c
new file mode 100644
index 000000000..9a45cda05
--- /dev/null
+++ b/drivers/media/radio/dsbr100.c
@@ -0,0 +1,420 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* 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>
+*/
+
+#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);
+
+	strscpy(v->driver, "dsbr100", sizeof(v->driver));
+	strscpy(v->card, "D-Link R-100 USB FM Radio", sizeof(v->card));
+	usb_make_path(radio->usbdev, v->bus_info, sizeof(v->bus_info));
+	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);
+	strscpy(v->name, "FM", sizeof(v->name));
+	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);
+	strscpy(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->videodev.device_caps = V4L2_CAP_RADIO | V4L2_CAP_TUNER;
+
+	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);