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420 lines
12 KiB
420 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* 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 <[email protected]> |
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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 <[email protected]>"); |
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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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|
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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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strscpy(v->driver, "dsbr100", sizeof(v->driver)); |
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strscpy(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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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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strscpy(v->name, "FM", sizeof(v->name)); |
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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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strscpy(radio->videodev.name, v4l2_dev->name, |
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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->videodev.device_caps = V4L2_CAP_RADIO | V4L2_CAP_TUNER; |
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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 const 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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