687 lines
17 KiB
C
687 lines
17 KiB
C
/*
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* A driver for the AverMedia MR 800 USB FM radio. This device plugs
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* into both the USB and an analog audio input, so this thing
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* only deals with initialization 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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* Copyright (c) 2008 Alexey Klimov <klimov.linux@gmail.com>
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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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/*
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* Big thanks to authors of dsbr100.c and radio-si470x.c
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*
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* When work was looked pretty good, i discover this:
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* http://av-usbradio.sourceforge.net/index.php
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* http://sourceforge.net/projects/av-usbradio/
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* Latest release of theirs project was in 2005.
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* Probably, this driver could be improved trough using their
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* achievements (specifications given).
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* So, we have smth to begin with.
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*
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* History:
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* Version 0.01: First working version.
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* It's required to blacklist AverMedia USB Radio
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* in usbhid/hid-quirks.c
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*
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* Many things to do:
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* - Correct power managment of device (suspend & resume)
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* - Make x86 independance (little-endian and big-endian stuff)
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* - Add code for scanning and smooth tuning
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* - Checked and add stereo&mono stuff
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* - Add code for sensitivity value
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* - Correct mistakes
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* - In Japan another FREQ_MIN and FREQ_MAX
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*/
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/* kernel includes */
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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 <media/v4l2-common.h>
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#include <media/v4l2-ioctl.h>
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#include <linux/usb.h>
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#include <linux/version.h> /* for KERNEL_VERSION MACRO */
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/* driver and module definitions */
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#define DRIVER_AUTHOR "Alexey Klimov <klimov.linux@gmail.com>"
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#define DRIVER_DESC "AverMedia MR 800 USB FM radio driver"
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#define DRIVER_VERSION "0.01"
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#define RADIO_VERSION KERNEL_VERSION(0, 0, 1)
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MODULE_AUTHOR(DRIVER_AUTHOR);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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#define USB_AMRADIO_VENDOR 0x07ca
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#define USB_AMRADIO_PRODUCT 0xb800
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/* dev_warn macro with driver name */
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#define MR800_DRIVER_NAME "radio-mr800"
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#define amradio_dev_warn(dev, fmt, arg...) \
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dev_warn(dev, MR800_DRIVER_NAME " - " fmt, ##arg)
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/* Probably USB_TIMEOUT should be modified in module parameter */
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#define BUFFER_LENGTH 8
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#define USB_TIMEOUT 500
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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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/*
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* Commands that device should understand
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* List isnt full and will be updated with implementation of new functions
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*/
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#define AMRADIO_SET_MUTE 0xab
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/* Comfortable defines for amradio_set_mute */
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#define AMRADIO_START 0x00
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#define AMRADIO_STOP 0x01
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/* module parameter */
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static int radio_nr = -1;
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module_param(radio_nr, int, 0);
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MODULE_PARM_DESC(radio_nr, "Radio Nr");
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static struct v4l2_queryctrl radio_qctrl[] = {
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{
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.id = V4L2_CID_AUDIO_MUTE,
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.name = "Mute",
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.minimum = 0,
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.maximum = 1,
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.step = 1,
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.default_value = 1,
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.type = V4L2_CTRL_TYPE_BOOLEAN,
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},
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/* HINT: the disabled controls are only here to satify kradio and such apps */
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{ .id = V4L2_CID_AUDIO_VOLUME,
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.flags = V4L2_CTRL_FLAG_DISABLED,
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},
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{
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.id = V4L2_CID_AUDIO_BALANCE,
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.flags = V4L2_CTRL_FLAG_DISABLED,
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},
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{
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.id = V4L2_CID_AUDIO_BASS,
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.flags = V4L2_CTRL_FLAG_DISABLED,
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},
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{
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.id = V4L2_CID_AUDIO_TREBLE,
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.flags = V4L2_CTRL_FLAG_DISABLED,
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},
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{
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.id = V4L2_CID_AUDIO_LOUDNESS,
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.flags = V4L2_CTRL_FLAG_DISABLED,
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},
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};
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static int usb_amradio_probe(struct usb_interface *intf,
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const struct usb_device_id *id);
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static void usb_amradio_disconnect(struct usb_interface *intf);
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static int usb_amradio_open(struct file *file);
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static int usb_amradio_close(struct file *file);
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static int usb_amradio_suspend(struct usb_interface *intf,
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pm_message_t message);
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static int usb_amradio_resume(struct usb_interface *intf);
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/* Data for one (physical) device */
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struct amradio_device {
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/* reference to USB and video device */
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struct usb_device *usbdev;
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struct video_device *videodev;
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unsigned char *buffer;
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struct mutex lock; /* buffer locking */
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int curfreq;
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int stereo;
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int users;
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int removed;
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int muted;
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};
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/* USB Device ID List */
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static struct usb_device_id usb_amradio_device_table[] = {
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{USB_DEVICE_AND_INTERFACE_INFO(USB_AMRADIO_VENDOR, USB_AMRADIO_PRODUCT,
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USB_CLASS_HID, 0, 0) },
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{ } /* Terminating entry */
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};
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MODULE_DEVICE_TABLE(usb, usb_amradio_device_table);
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/* USB subsystem interface */
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static struct usb_driver usb_amradio_driver = {
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.name = MR800_DRIVER_NAME,
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.probe = usb_amradio_probe,
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.disconnect = usb_amradio_disconnect,
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.suspend = usb_amradio_suspend,
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.resume = usb_amradio_resume,
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.reset_resume = usb_amradio_resume,
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.id_table = usb_amradio_device_table,
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.supports_autosuspend = 0,
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};
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/* switch on/off the radio. Send 8 bytes to device */
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static int amradio_set_mute(struct amradio_device *radio, char argument)
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{
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int retval;
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int size;
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/* safety check */
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if (radio->removed)
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return -EIO;
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mutex_lock(&radio->lock);
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radio->buffer[0] = 0x00;
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radio->buffer[1] = 0x55;
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radio->buffer[2] = 0xaa;
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radio->buffer[3] = 0x00;
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radio->buffer[4] = AMRADIO_SET_MUTE;
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radio->buffer[5] = argument;
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radio->buffer[6] = 0x00;
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radio->buffer[7] = 0x00;
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retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
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(void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);
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if (retval) {
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mutex_unlock(&radio->lock);
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return retval;
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}
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radio->muted = argument;
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mutex_unlock(&radio->lock);
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return retval;
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}
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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 amradio_setfreq(struct amradio_device *radio, int freq)
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{
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int retval;
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int size;
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unsigned short freq_send = 0x13 + (freq >> 3) / 25;
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/* safety check */
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if (radio->removed)
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return -EIO;
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mutex_lock(&radio->lock);
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radio->buffer[0] = 0x00;
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radio->buffer[1] = 0x55;
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radio->buffer[2] = 0xaa;
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radio->buffer[3] = 0x03;
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radio->buffer[4] = 0xa4;
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radio->buffer[5] = 0x00;
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radio->buffer[6] = 0x00;
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radio->buffer[7] = 0x08;
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retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
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(void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);
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if (retval) {
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mutex_unlock(&radio->lock);
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return retval;
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}
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/* frequency is calculated from freq_send and placed in first 2 bytes */
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radio->buffer[0] = (freq_send >> 8) & 0xff;
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radio->buffer[1] = freq_send & 0xff;
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radio->buffer[2] = 0x01;
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radio->buffer[3] = 0x00;
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radio->buffer[4] = 0x00;
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/* 5 and 6 bytes of buffer already = 0x00 */
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radio->buffer[7] = 0x00;
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retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
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(void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);
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if (retval) {
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mutex_unlock(&radio->lock);
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return retval;
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}
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radio->stereo = 0;
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mutex_unlock(&radio->lock);
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return retval;
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}
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/* USB subsystem interface begins here */
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/* handle unplugging of the device, release data structures
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if nothing keeps us from doing it. If something is still
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keeping us busy, the release callback of v4l will take care
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of releasing it. */
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static void usb_amradio_disconnect(struct usb_interface *intf)
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{
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struct amradio_device *radio = usb_get_intfdata(intf);
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mutex_lock(&radio->lock);
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radio->removed = 1;
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mutex_unlock(&radio->lock);
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usb_set_intfdata(intf, NULL);
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video_unregister_device(radio->videodev);
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}
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/* vidioc_querycap - query device capabilities */
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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 amradio_device *radio = video_drvdata(file);
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strlcpy(v->driver, "radio-mr800", sizeof(v->driver));
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strlcpy(v->card, "AverMedia MR 800 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->version = RADIO_VERSION;
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v->capabilities = V4L2_CAP_TUNER;
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return 0;
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}
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/* vidioc_g_tuner - get tuner attributes */
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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 amradio_device *radio = video_get_drvdata(video_devdata(file));
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/* safety check */
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if (radio->removed)
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return -EIO;
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if (v->index > 0)
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return -EINVAL;
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/* TODO: Add function which look is signal stereo or not
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* amradio_getstat(radio);
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*/
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radio->stereo = -1;
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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 = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
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v->capability = V4L2_TUNER_CAP_LOW;
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if (radio->stereo)
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v->audmode = V4L2_TUNER_MODE_STEREO;
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else
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v->audmode = V4L2_TUNER_MODE_MONO;
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v->signal = 0xffff; /* Can't get the signal strength, sad.. */
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v->afc = 0; /* Don't know what is this */
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return 0;
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}
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/* vidioc_s_tuner - set tuner attributes */
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static int vidioc_s_tuner(struct file *file, void *priv,
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struct v4l2_tuner *v)
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{
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struct amradio_device *radio = video_get_drvdata(video_devdata(file));
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/* safety check */
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if (radio->removed)
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return -EIO;
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if (v->index > 0)
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return -EINVAL;
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return 0;
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}
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/* vidioc_s_frequency - set tuner radio frequency */
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static int vidioc_s_frequency(struct file *file, void *priv,
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struct v4l2_frequency *f)
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{
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struct amradio_device *radio = video_get_drvdata(video_devdata(file));
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int retval;
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/* safety check */
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if (radio->removed)
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return -EIO;
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radio->curfreq = f->frequency;
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retval = amradio_setfreq(radio, radio->curfreq);
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if (retval < 0)
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amradio_dev_warn(&radio->videodev->dev,
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"set frequency failed\n");
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return 0;
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}
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/* vidioc_g_frequency - get tuner radio frequency */
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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 amradio_device *radio = video_get_drvdata(video_devdata(file));
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/* safety check */
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if (radio->removed)
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return -EIO;
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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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/* vidioc_queryctrl - enumerate control items */
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static int vidioc_queryctrl(struct file *file, void *priv,
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struct v4l2_queryctrl *qc)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
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if (qc->id && qc->id == radio_qctrl[i].id) {
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memcpy(qc, &(radio_qctrl[i]), sizeof(*qc));
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return 0;
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}
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}
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return -EINVAL;
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}
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/* vidioc_g_ctrl - get the value of a control */
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static int vidioc_g_ctrl(struct file *file, void *priv,
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struct v4l2_control *ctrl)
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{
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struct amradio_device *radio = video_get_drvdata(video_devdata(file));
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/* safety check */
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if (radio->removed)
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return -EIO;
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switch (ctrl->id) {
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case V4L2_CID_AUDIO_MUTE:
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ctrl->value = radio->muted;
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return 0;
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}
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return -EINVAL;
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}
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/* vidioc_s_ctrl - set the value of a control */
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static int vidioc_s_ctrl(struct file *file, void *priv,
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struct v4l2_control *ctrl)
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{
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struct amradio_device *radio = video_get_drvdata(video_devdata(file));
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int retval;
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/* safety check */
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if (radio->removed)
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return -EIO;
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switch (ctrl->id) {
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case V4L2_CID_AUDIO_MUTE:
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if (ctrl->value) {
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retval = amradio_set_mute(radio, AMRADIO_STOP);
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if (retval < 0) {
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amradio_dev_warn(&radio->videodev->dev,
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"amradio_stop failed\n");
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return -1;
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}
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} else {
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retval = amradio_set_mute(radio, AMRADIO_START);
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if (retval < 0) {
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amradio_dev_warn(&radio->videodev->dev,
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"amradio_start failed\n");
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return -1;
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}
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}
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return 0;
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}
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return -EINVAL;
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}
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/* vidioc_g_audio - get audio attributes */
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static int vidioc_g_audio(struct file *file, void *priv,
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struct v4l2_audio *a)
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{
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if (a->index > 1)
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return -EINVAL;
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strcpy(a->name, "Radio");
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a->capability = V4L2_AUDCAP_STEREO;
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return 0;
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}
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/* vidioc_s_audio - set audio attributes */
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static int vidioc_s_audio(struct file *file, void *priv,
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struct v4l2_audio *a)
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{
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if (a->index != 0)
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return -EINVAL;
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return 0;
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}
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/* vidioc_g_input - get input */
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static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
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{
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*i = 0;
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return 0;
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}
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/* vidioc_s_input - set input */
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static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
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{
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if (i != 0)
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return -EINVAL;
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return 0;
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}
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/* open device - amradio_start() and amradio_setfreq() */
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static int usb_amradio_open(struct file *file)
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{
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struct amradio_device *radio = video_get_drvdata(video_devdata(file));
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int retval;
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lock_kernel();
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radio->users = 1;
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radio->muted = 1;
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retval = amradio_set_mute(radio, AMRADIO_START);
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if (retval < 0) {
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amradio_dev_warn(&radio->videodev->dev,
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"radio did not start up properly\n");
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radio->users = 0;
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unlock_kernel();
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return -EIO;
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}
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retval = amradio_setfreq(radio, radio->curfreq);
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if (retval < 0)
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amradio_dev_warn(&radio->videodev->dev,
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"set frequency failed\n");
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unlock_kernel();
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return 0;
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}
|
|
|
|
/*close device */
|
|
static int usb_amradio_close(struct file *file)
|
|
{
|
|
struct amradio_device *radio = video_get_drvdata(video_devdata(file));
|
|
int retval;
|
|
|
|
if (!radio)
|
|
return -ENODEV;
|
|
|
|
radio->users = 0;
|
|
|
|
if (!radio->removed) {
|
|
retval = amradio_set_mute(radio, AMRADIO_STOP);
|
|
if (retval < 0)
|
|
amradio_dev_warn(&radio->videodev->dev,
|
|
"amradio_stop failed\n");
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Suspend device - stop device. Need to be checked and fixed */
|
|
static int usb_amradio_suspend(struct usb_interface *intf, pm_message_t message)
|
|
{
|
|
struct amradio_device *radio = usb_get_intfdata(intf);
|
|
int retval;
|
|
|
|
retval = amradio_set_mute(radio, AMRADIO_STOP);
|
|
if (retval < 0)
|
|
dev_warn(&intf->dev, "amradio_stop failed\n");
|
|
|
|
dev_info(&intf->dev, "going into suspend..\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Resume device - start device. Need to be checked and fixed */
|
|
static int usb_amradio_resume(struct usb_interface *intf)
|
|
{
|
|
struct amradio_device *radio = usb_get_intfdata(intf);
|
|
int retval;
|
|
|
|
retval = amradio_set_mute(radio, AMRADIO_START);
|
|
if (retval < 0)
|
|
dev_warn(&intf->dev, "amradio_start failed\n");
|
|
|
|
dev_info(&intf->dev, "coming out of suspend..\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* File system interface */
|
|
static const struct v4l2_file_operations usb_amradio_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = usb_amradio_open,
|
|
.release = usb_amradio_close,
|
|
.ioctl = video_ioctl2,
|
|
};
|
|
|
|
static const struct v4l2_ioctl_ops usb_amradio_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_queryctrl = vidioc_queryctrl,
|
|
.vidioc_g_ctrl = vidioc_g_ctrl,
|
|
.vidioc_s_ctrl = vidioc_s_ctrl,
|
|
.vidioc_g_audio = vidioc_g_audio,
|
|
.vidioc_s_audio = vidioc_s_audio,
|
|
.vidioc_g_input = vidioc_g_input,
|
|
.vidioc_s_input = vidioc_s_input,
|
|
};
|
|
|
|
static void usb_amradio_device_release(struct video_device *videodev)
|
|
{
|
|
struct amradio_device *radio = video_get_drvdata(videodev);
|
|
|
|
/* we call v4l to free radio->videodev */
|
|
video_device_release(videodev);
|
|
|
|
/* free rest memory */
|
|
kfree(radio->buffer);
|
|
kfree(radio);
|
|
}
|
|
|
|
/* V4L2 interface */
|
|
static struct video_device amradio_videodev_template = {
|
|
.name = "AverMedia MR 800 USB FM Radio",
|
|
.fops = &usb_amradio_fops,
|
|
.ioctl_ops = &usb_amradio_ioctl_ops,
|
|
.release = usb_amradio_device_release,
|
|
};
|
|
|
|
/* check if the device is present and register with v4l and usb if it is */
|
|
static int usb_amradio_probe(struct usb_interface *intf,
|
|
const struct usb_device_id *id)
|
|
{
|
|
struct amradio_device *radio;
|
|
int retval;
|
|
|
|
radio = kmalloc(sizeof(struct amradio_device), GFP_KERNEL);
|
|
|
|
if (!radio) {
|
|
dev_err(&intf->dev, "kmalloc for amradio_device failed\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
radio->buffer = kmalloc(BUFFER_LENGTH, GFP_KERNEL);
|
|
|
|
if (!radio->buffer) {
|
|
dev_err(&intf->dev, "kmalloc for radio->buffer failed\n");
|
|
kfree(radio);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
radio->videodev = video_device_alloc();
|
|
|
|
if (!radio->videodev) {
|
|
dev_err(&intf->dev, "video_device_alloc failed\n");
|
|
kfree(radio->buffer);
|
|
kfree(radio);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
memcpy(radio->videodev, &amradio_videodev_template,
|
|
sizeof(amradio_videodev_template));
|
|
|
|
radio->removed = 0;
|
|
radio->users = 0;
|
|
radio->usbdev = interface_to_usbdev(intf);
|
|
radio->curfreq = 95.16 * FREQ_MUL;
|
|
|
|
mutex_init(&radio->lock);
|
|
|
|
video_set_drvdata(radio->videodev, radio);
|
|
retval = video_register_device(radio->videodev, VFL_TYPE_RADIO, radio_nr);
|
|
if (retval < 0) {
|
|
dev_err(&intf->dev, "could not register video device\n");
|
|
video_device_release(radio->videodev);
|
|
kfree(radio->buffer);
|
|
kfree(radio);
|
|
return -EIO;
|
|
}
|
|
|
|
usb_set_intfdata(intf, radio);
|
|
return 0;
|
|
}
|
|
|
|
static int __init amradio_init(void)
|
|
{
|
|
int retval = usb_register(&usb_amradio_driver);
|
|
|
|
pr_info(KBUILD_MODNAME
|
|
": version " DRIVER_VERSION " " DRIVER_DESC "\n");
|
|
|
|
if (retval)
|
|
pr_err(KBUILD_MODNAME
|
|
": usb_register failed. Error number %d\n", retval);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static void __exit amradio_exit(void)
|
|
{
|
|
usb_deregister(&usb_amradio_driver);
|
|
}
|
|
|
|
module_init(amradio_init);
|
|
module_exit(amradio_exit);
|
|
|