// 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 <[email protected]> */ #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(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; MODULE_VERSION(…) …; #define DSB100_VENDOR … #define DSB100_PRODUCT … /* Commands the device appears to understand */ #define DSB100_TUNE … #define DSB100_ONOFF … #define TB_LEN … /* Frequency limits in MHz -- these are European values. For Japanese devices, that would be 76 and 91. */ #define FREQ_MIN … #define FREQ_MAX … #define FREQ_MUL … #define v4l2_dev_to_radio(d) … static int radio_nr = …; module_param(radio_nr, int, 0); /* Data for one (physical) device */ struct dsbr100_device { … }; /* 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) { … } /* switch on radio */ static int dsbr100_start(struct dsbr100_device *radio) { … } /* switch off radio */ static int dsbr100_stop(struct dsbr100_device *radio) { … } /* 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) { … } static int vidioc_querycap(struct file *file, void *priv, struct v4l2_capability *v) { … } static int vidioc_g_tuner(struct file *file, void *priv, struct v4l2_tuner *v) { … } static int vidioc_s_tuner(struct file *file, void *priv, const struct v4l2_tuner *v) { … } static int vidioc_s_frequency(struct file *file, void *priv, const struct v4l2_frequency *f) { … } static int vidioc_g_frequency(struct file *file, void *priv, struct v4l2_frequency *f) { … } static int usb_dsbr100_s_ctrl(struct v4l2_ctrl *ctrl) { … } /* 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) { … } /* Suspend device - stop device. */ static int usb_dsbr100_suspend(struct usb_interface *intf, pm_message_t message) { … } /* Resume device - start device. */ static int usb_dsbr100_resume(struct usb_interface *intf) { … } /* free data structures */ static void usb_dsbr100_release(struct v4l2_device *v4l2_dev) { … } static const struct v4l2_ctrl_ops usb_dsbr100_ctrl_ops = …; /* File system interface */ static const struct v4l2_file_operations usb_dsbr100_fops = …; static const struct v4l2_ioctl_ops usb_dsbr100_ioctl_ops = …; /* 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) { … } static const struct usb_device_id usb_dsbr100_device_table[] = …; MODULE_DEVICE_TABLE(usb, usb_dsbr100_device_table); /* USB subsystem interface */ static struct usb_driver usb_dsbr100_driver = …; module_usb_driver(…) …;
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