- 根目录:
- drivers
- media
- radio
- radio-mr800.c
/*
* A driver for the AverMedia MR 800 USB FM radio. This device plugs
* into both the USB and an analog audio input, so this thing
* only deals with initialization and frequency setting, the
* audio data has to be handled by a sound driver.
*
* Copyright (c) 2008 Alexey Klimov <klimov.linux@gmail.com>
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Big thanks to authors and contributors of dsbr100.c and radio-si470x.c
*
* When work was looked pretty good, i discover this:
* http://av-usbradio.sourceforge.net/index.php
* http://sourceforge.net/projects/av-usbradio/
* Latest release of theirs project was in 2005.
* Probably, this driver could be improved through using their
* achievements (specifications given).
* Also, Faidon Liambotis <paravoid@debian.org> wrote nice driver for this radio
* in 2007. He allowed to use his driver to improve current mr800 radio driver.
* http://kerneltrap.org/mailarchive/linux-usb-devel/2007/10/11/342492
*
* Version 0.01: First working version.
* It's required to blacklist AverMedia USB Radio
* in usbhid/hid-quirks.c
* Version 0.10: A lot of cleanups and fixes: unpluging the device,
* few mutex locks were added, codinstyle issues, etc.
* Added stereo support. Thanks to
* Douglas Schilling Landgraf <dougsland@gmail.com> and
* David Ellingsworth <david@identd.dyndns.org>
* for discussion, help and support.
* Version 0.11: Converted to v4l2_device.
*
* Many things to do:
* - Correct power management of device (suspend & resume)
* - Add code for scanning and smooth tuning
* - Add code for sensitivity value
* - Correct mistakes
* - In Japan another FREQ_MIN and FREQ_MAX
*/
/* kernel includes */
#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 <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <linux/usb.h>
#include <linux/mutex.h>
/* driver and module definitions */
#define DRIVER_AUTHOR "Alexey Klimov <klimov.linux@gmail.com>"
#define DRIVER_DESC "AverMedia MR 800 USB FM radio driver"
#define DRIVER_VERSION "0.1.2"
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
MODULE_VERSION(DRIVER_VERSION);
#define USB_AMRADIO_VENDOR 0x07ca
#define USB_AMRADIO_PRODUCT 0xb800
/* dev_warn macro with driver name */
#define MR800_DRIVER_NAME "radio-mr800"
#define amradio_dev_warn(dev, fmt, arg...) \
dev_warn(dev, MR800_DRIVER_NAME " - " fmt, ##arg)
#define amradio_dev_err(dev, fmt, arg...) \
dev_err(dev, MR800_DRIVER_NAME " - " fmt, ##arg)
/* Probably USB_TIMEOUT should be modified in module parameter */
#define BUFFER_LENGTH 8
#define USB_TIMEOUT 500
/* 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
/*
* Commands that device should understand
* List isn't full and will be updated with implementation of new functions
*/
#define AMRADIO_SET_FREQ 0xa4
#define AMRADIO_SET_MUTE 0xab
#define AMRADIO_SET_MONO 0xae
/* Comfortable defines for amradio_set_mute */
#define AMRADIO_START 0x00
#define AMRADIO_STOP 0x01
/* Comfortable defines for amradio_set_stereo */
#define WANT_STEREO 0x00
#define WANT_MONO 0x01
/* module parameter */
static int radio_nr = -1;
module_param(radio_nr, int, 0);
MODULE_PARM_DESC(radio_nr, "Radio Nr");
static int usb_amradio_probe(struct usb_interface *intf,
const struct usb_device_id *id);
static void usb_amradio_disconnect(struct usb_interface *intf);
static int usb_amradio_open(struct file *file);
static int usb_amradio_close(struct file *file);
static int usb_amradio_suspend(struct usb_interface *intf,
pm_message_t message);
static int usb_amradio_resume(struct usb_interface *intf);
/* Data for one (physical) device */
struct amradio_device {
/* reference to USB and video device */
struct usb_device *usbdev;
struct usb_interface *intf;
struct video_device videodev;
struct v4l2_device v4l2_dev;
unsigned char *buffer;
struct mutex lock; /* buffer locking */
int curfreq;
int stereo;
int muted;
int initialized;
};
static inline struct amradio_device *to_amradio_dev(struct v4l2_device *v4l2_dev)
{
return container_of(v4l2_dev, struct amradio_device, v4l2_dev);
}
/* USB Device ID List */
static struct usb_device_id usb_amradio_device_table[] = {
{USB_DEVICE_AND_INTERFACE_INFO(USB_AMRADIO_VENDOR, USB_AMRADIO_PRODUCT,
USB_CLASS_HID, 0, 0) },
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, usb_amradio_device_table);
/* USB subsystem interface */
static struct usb_driver usb_amradio_driver = {
.name = MR800_DRIVER_NAME,
.probe = usb_amradio_probe,
.disconnect = usb_amradio_disconnect,
.suspend = usb_amradio_suspend,
.resume = usb_amradio_resume,
.reset_resume = usb_amradio_resume,
.id_table = usb_amradio_device_table,
.supports_autosuspend = 1,
};
/* switch on/off the radio. Send 8 bytes to device */
static int amradio_set_mute(struct amradio_device *radio, char argument)
{
int retval;
int size;
radio->buffer[0] = 0x00;
radio->buffer[1] = 0x55;
radio->buffer[2] = 0xaa;
radio->buffer[3] = 0x00;
radio->buffer[4] = AMRADIO_SET_MUTE;
radio->buffer[5] = argument;
radio->buffer[6] = 0x00;
radio->buffer[7] = 0x00;
retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
(void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);
if (retval < 0 || size != BUFFER_LENGTH) {
amradio_dev_warn(&radio->videodev.dev, "set mute failed\n");
return retval;
}
radio->muted = argument;
return retval;
}
/* set a frequency, freq is defined by v4l's TUNER_LOW, i.e. 1/16th kHz */
static int amradio_setfreq(struct amradio_device *radio, int freq)
{
int retval;
int size;
unsigned short freq_send = 0x10 + (freq >> 3) / 25;
radio->buffer[0] = 0x00;
radio->buffer[1] = 0x55;
radio->buffer[2] = 0xaa;
radio->buffer[3] = 0x03;
radio->buffer[4] = AMRADIO_SET_FREQ;
radio->buffer[5] = 0x00;
radio->buffer[6] = 0x00;
radio->buffer[7] = 0x08;
retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
(void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);
if (retval < 0 || size != BUFFER_LENGTH)
goto out_err;
/* frequency is calculated from freq_send and placed in first 2 bytes */
radio->buffer[0] = (freq_send >> 8) & 0xff;
radio->buffer[1] = freq_send & 0xff;
radio->buffer[2] = 0x01;
radio->buffer[3] = 0x00;
radio->buffer[4] = 0x00;
/* 5 and 6 bytes of buffer already = 0x00 */
radio->buffer[7] = 0x00;
retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
(void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);
if (retval < 0 || size != BUFFER_LENGTH)
goto out_err;
radio->curfreq = freq;
goto out;
out_err:
amradio_dev_warn(&radio->videodev.dev, "set frequency failed\n");
out:
return retval;
}
static int amradio_set_stereo(struct amradio_device *radio, char argument)
{
int retval;
int size;
radio->buffer[0] = 0x00;
radio->buffer[1] = 0x55;
radio->buffer[2] = 0xaa;
radio->buffer[3] = 0x00;
radio->buffer[4] = AMRADIO_SET_MONO;
radio->buffer[5] = argument;
radio->buffer[6] = 0x00;
radio->buffer[7] = 0x00;
retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
(void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);
if (retval < 0 || size != BUFFER_LENGTH) {
amradio_dev_warn(&radio->videodev.dev, "set stereo failed\n");
return retval;
}
if (argument == WANT_STEREO)
radio->stereo = 1;
else
radio->stereo = 0;
return retval;
}
/* Handle unplugging the device.
* We call video_unregister_device in any case.
* The last function called in this procedure is
* usb_amradio_device_release.
*/
static void usb_amradio_disconnect(struct usb_interface *intf)
{
struct amradio_device *radio = to_amradio_dev(usb_get_intfdata(intf));
mutex_lock(&radio->lock);
/* increase the device node's refcount */
get_device(&radio->videodev.dev);
v4l2_device_disconnect(&radio->v4l2_dev);
video_unregister_device(&radio->videodev);
mutex_unlock(&radio->lock);
/* decrease the device node's refcount, allowing it to be released */
put_device(&radio->videodev.dev);
}
/* vidioc_querycap - query device capabilities */
static int vidioc_querycap(struct file *file, void *priv,
struct v4l2_capability *v)
{
struct amradio_device *radio = file->private_data;
strlcpy(v->driver, "radio-mr800", sizeof(v->driver));
strlcpy(v->card, "AverMedia MR 800 USB FM Radio", sizeof(v->card));
usb_make_path(radio->usbdev, v->bus_info, sizeof(v->bus_info));
v->capabilities = V4L2_CAP_TUNER;
return 0;
}
/* vidioc_g_tuner - get tuner attributes */
static int vidioc_g_tuner(struct file *file, void *priv,
struct v4l2_tuner *v)
{
struct amradio_device *radio = file->private_data;
int retval;
if (v->index > 0)
return -EINVAL;
/* TODO: Add function which look is signal stereo or not
* amradio_getstat(radio);
*/
/* we call amradio_set_stereo to set radio->stereo
* Honestly, amradio_getstat should cover this in future and
* amradio_set_stereo shouldn't be here
*/
retval = amradio_set_stereo(radio, WANT_STEREO);
strcpy(v->name, "FM");
v->type = V4L2_TUNER_RADIO;
v->rangelow = FREQ_MIN * FREQ_MUL;
v->rangehigh = FREQ_MAX * FREQ_MUL;
v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
v->capability = V4L2_TUNER_CAP_LOW;
if (radio->stereo)
v->audmode = V4L2_TUNER_MODE_STEREO;
else
v->audmode = V4L2_TUNER_MODE_MONO;
v->signal = 0xffff; /* Can't get the signal strength, sad.. */
v->afc = 0; /* Don't know what is this */
return retval;
}
/* vidioc_s_tuner - set tuner attributes */
static int vidioc_s_tuner(struct file *file, void *priv,
struct v4l2_tuner *v)
{
struct amradio_device *radio = file->private_data;
int retval = -EINVAL;
if (v->index > 0)
return -EINVAL;
/* mono/stereo selector */
switch (v->audmode) {
case V4L2_TUNER_MODE_MONO:
retval = amradio_set_stereo(radio, WANT_MONO);
break;
case V4L2_TUNER_MODE_STEREO:
retval = amradio_set_stereo(radio, WANT_STEREO);
break;
}
return retval;
}
/* vidioc_s_frequency - set tuner radio frequency */
static int vidioc_s_frequency(struct file *file, void *priv,
struct v4l2_frequency *f)
{
struct amradio_device *radio = file->private_data;
if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
return -EINVAL;
return amradio_setfreq(radio, f->frequency);
}
/* vidioc_g_frequency - get tuner radio frequency */
static int vidioc_g_frequency(struct file *file, void *priv,
struct v4l2_frequency *f)
{
struct amradio_device *radio = file->private_data;
if (f->tuner != 0)
return -EINVAL;
f->type = V4L2_TUNER_RADIO;
f->frequency = radio->curfreq;
return 0;
}
/* vidioc_queryctrl - enumerate control items */
static int vidioc_queryctrl(struct file *file, void *priv,
struct v4l2_queryctrl *qc)
{
switch (qc->id) {
case V4L2_CID_AUDIO_MUTE:
return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
}
return -EINVAL;
}
/* vidioc_g_ctrl - get the value of a control */
static int vidioc_g_ctrl(struct file *file, void *priv,
struct v4l2_control *ctrl)
{
struct amradio_device *radio = file->private_data;
switch (ctrl->id) {
case V4L2_CID_AUDIO_MUTE:
ctrl->value = radio->muted;
return 0;
}
return -EINVAL;
}
/* vidioc_s_ctrl - set the value of a control */
static int vidioc_s_ctrl(struct file *file, void *priv,
struct v4l2_control *ctrl)
{
struct amradio_device *radio = file->private_data;
int retval = -EINVAL;
switch (ctrl->id) {
case V4L2_CID_AUDIO_MUTE:
if (ctrl->value)
retval = amradio_set_mute(radio, AMRADIO_STOP);
else
retval = amradio_set_mute(radio, AMRADIO_START);
break;
}
return retval;
}
/* vidioc_g_audio - get audio attributes */
static int vidioc_g_audio(struct file *file, void *priv,
struct v4l2_audio *a)
{
if (a->index > 1)
return -EINVAL;
strcpy(a->name, "Radio");
a->capability = V4L2_AUDCAP_STEREO;
return 0;
}
/* vidioc_s_audio - set audio attributes */
static int vidioc_s_audio(struct file *file, void *priv,
struct v4l2_audio *a)
{
if (a->index != 0)
return -EINVAL;
return 0;
}
/* vidioc_g_input - get input */
static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
{
*i = 0;
return 0;
}
/* vidioc_s_input - set input */
static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
{
if (i != 0)
return -EINVAL;
return 0;
}
static int usb_amradio_init(struct amradio_device *radio)
{
int retval;
retval = amradio_set_mute(radio, AMRADIO_STOP);
if (retval)
goto out_err;
retval = amradio_set_stereo(radio, WANT_STEREO);
if (retval)
goto out_err;
radio->initialized = 1;
goto out;
out_err:
amradio_dev_err(&radio->videodev.dev, "initialization failed\n");
out:
return retval;
}
/* open device - amradio_start() and amradio_setfreq() */
static int usb_amradio_open(struct file *file)
{
struct amradio_device *radio = video_drvdata(file);
int retval;
file->private_data = radio;
retval = usb_autopm_get_interface(radio->intf);
if (retval)
return retval;
if (unlikely(!radio->initialized)) {
retval = usb_amradio_init(radio);
if (retval)
usb_autopm_put_interface(radio->intf);
}
return retval;
}
/*close device */
static int usb_amradio_close(struct file *file)
{
struct amradio_device *radio = file->private_data;
if (video_is_registered(&radio->videodev))
usb_autopm_put_interface(radio->intf);
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 = to_amradio_dev(usb_get_intfdata(intf));
mutex_lock(&radio->lock);
if (!radio->muted && radio->initialized) {
amradio_set_mute(radio, AMRADIO_STOP);
radio->muted = 0;
}
mutex_unlock(&radio->lock);
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 = to_amradio_dev(usb_get_intfdata(intf));
mutex_lock(&radio->lock);
if (unlikely(!radio->initialized))
goto unlock;
if (radio->stereo)
amradio_set_stereo(radio, WANT_STEREO);
else
amradio_set_stereo(radio, WANT_MONO);
amradio_setfreq(radio, radio->curfreq);
if (!radio->muted)
amradio_set_mute(radio, AMRADIO_START);
unlock:
mutex_unlock(&radio->lock);
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,
.unlocked_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_video_device_release(struct video_device *videodev)
{
struct amradio_device *radio = video_get_drvdata(videodev);
/* free rest memory */
kfree(radio->buffer);
kfree(radio);
}
/* 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 = 0;
radio = kzalloc(sizeof(struct amradio_device), GFP_KERNEL);
if (!radio) {
dev_err(&intf->dev, "kmalloc for amradio_device failed\n");
retval = -ENOMEM;
goto err;
}
radio->buffer = kmalloc(BUFFER_LENGTH, GFP_KERNEL);
if (!radio->buffer) {
dev_err(&intf->dev, "kmalloc for radio->buffer failed\n");
retval = -ENOMEM;
goto err_nobuf;
}
retval = v4l2_device_register(&intf->dev, &radio->v4l2_dev);
if (retval < 0) {
dev_err(&intf->dev, "couldn't register v4l2_device\n");
goto err_v4l2;
}
mutex_init(&radio->lock);
strlcpy(radio->videodev.name, radio->v4l2_dev.name,
sizeof(radio->videodev.name));
radio->videodev.v4l2_dev = &radio->v4l2_dev;
radio->videodev.fops = &usb_amradio_fops;
radio->videodev.ioctl_ops = &usb_amradio_ioctl_ops;
radio->videodev.release = usb_amradio_video_device_release;
radio->videodev.lock = &radio->lock;
radio->usbdev = interface_to_usbdev(intf);
radio->intf = intf;
radio->curfreq = 95.16 * FREQ_MUL;
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");
goto err_vdev;
}
return 0;
err_vdev:
v4l2_device_unregister(&radio->v4l2_dev);
err_v4l2:
kfree(radio->buffer);
err_nobuf:
kfree(radio);
err:
return retval;
}
module_usb_driver(usb_amradio_driver);