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linux-next/drivers/media/usb/au0828/au0828-core.c
Shuah Khan 7b12adf6f5 [media] media: au0828 handle media_init and media_register window
Media device initialization and registration steps are split. There is a
window between media device init and media device register during usb
probe.

au0828 bridge driver and snd-usb-audio could try to initialize the media
device, if they simply checked, whether the device has been registered.
They also need to check whether the device has been initialized.

Change the au0828-core to check if media device is already initialized
during initialization step and check if media device is already
registered during the registration step.

[mchehab@osg.samsung.com: fix a merge conflict]
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
2016-02-27 09:06:06 -03:00

433 lines
10 KiB
C

/*
* Driver for the Auvitek USB bridge
*
* Copyright (c) 2008 Steven Toth <stoth@linuxtv.org>
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "au0828.h"
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/videodev2.h>
#include <media/v4l2-common.h>
#include <linux/mutex.h>
/* Due to enum tuner_pad_index */
#include <media/tuner.h>
/*
* 1 = General debug messages
* 2 = USB handling
* 4 = I2C related
* 8 = Bridge related
* 16 = IR related
*/
int au0828_debug;
module_param_named(debug, au0828_debug, int, 0644);
MODULE_PARM_DESC(debug,
"set debug bitmask: 1=general, 2=USB, 4=I2C, 8=bridge, 16=IR");
static unsigned int disable_usb_speed_check;
module_param(disable_usb_speed_check, int, 0444);
MODULE_PARM_DESC(disable_usb_speed_check,
"override min bandwidth requirement of 480M bps");
#define _AU0828_BULKPIPE 0x03
#define _BULKPIPESIZE 0xffff
static int send_control_msg(struct au0828_dev *dev, u16 request, u32 value,
u16 index);
static int recv_control_msg(struct au0828_dev *dev, u16 request, u32 value,
u16 index, unsigned char *cp, u16 size);
/* USB Direction */
#define CMD_REQUEST_IN 0x00
#define CMD_REQUEST_OUT 0x01
u32 au0828_readreg(struct au0828_dev *dev, u16 reg)
{
u8 result = 0;
recv_control_msg(dev, CMD_REQUEST_IN, 0, reg, &result, 1);
dprintk(8, "%s(0x%04x) = 0x%02x\n", __func__, reg, result);
return result;
}
u32 au0828_writereg(struct au0828_dev *dev, u16 reg, u32 val)
{
dprintk(8, "%s(0x%04x, 0x%02x)\n", __func__, reg, val);
return send_control_msg(dev, CMD_REQUEST_OUT, val, reg);
}
static int send_control_msg(struct au0828_dev *dev, u16 request, u32 value,
u16 index)
{
int status = -ENODEV;
if (dev->usbdev) {
/* cp must be memory that has been allocated by kmalloc */
status = usb_control_msg(dev->usbdev,
usb_sndctrlpipe(dev->usbdev, 0),
request,
USB_DIR_OUT | USB_TYPE_VENDOR |
USB_RECIP_DEVICE,
value, index, NULL, 0, 1000);
status = min(status, 0);
if (status < 0) {
pr_err("%s() Failed sending control message, error %d.\n",
__func__, status);
}
}
return status;
}
static int recv_control_msg(struct au0828_dev *dev, u16 request, u32 value,
u16 index, unsigned char *cp, u16 size)
{
int status = -ENODEV;
mutex_lock(&dev->mutex);
if (dev->usbdev) {
status = usb_control_msg(dev->usbdev,
usb_rcvctrlpipe(dev->usbdev, 0),
request,
USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
value, index,
dev->ctrlmsg, size, 1000);
status = min(status, 0);
if (status < 0) {
pr_err("%s() Failed receiving control message, error %d.\n",
__func__, status);
}
/* the host controller requires heap allocated memory, which
is why we didn't just pass "cp" into usb_control_msg */
memcpy(cp, dev->ctrlmsg, size);
}
mutex_unlock(&dev->mutex);
return status;
}
static void au0828_unregister_media_device(struct au0828_dev *dev)
{
#ifdef CONFIG_MEDIA_CONTROLLER
if (dev->media_dev &&
media_devnode_is_registered(&dev->media_dev->devnode)) {
media_device_unregister(dev->media_dev);
media_device_cleanup(dev->media_dev);
dev->media_dev = NULL;
}
#endif
}
void au0828_usb_release(struct au0828_dev *dev)
{
au0828_unregister_media_device(dev);
/* I2C */
au0828_i2c_unregister(dev);
kfree(dev);
}
static void au0828_usb_disconnect(struct usb_interface *interface)
{
struct au0828_dev *dev = usb_get_intfdata(interface);
dprintk(1, "%s()\n", __func__);
/* there is a small window after disconnect, before
dev->usbdev is NULL, for poll (e.g: IR) try to access
the device and fill the dmesg with error messages.
Set the status so poll routines can check and avoid
access after disconnect.
*/
dev->dev_state = DEV_DISCONNECTED;
au0828_rc_unregister(dev);
/* Digital TV */
au0828_dvb_unregister(dev);
usb_set_intfdata(interface, NULL);
mutex_lock(&dev->mutex);
dev->usbdev = NULL;
mutex_unlock(&dev->mutex);
if (au0828_analog_unregister(dev)) {
/*
* No need to call au0828_usb_release() if V4L2 is enabled,
* as this is already called via au0828_usb_v4l2_release()
*/
return;
}
au0828_usb_release(dev);
}
static int au0828_media_device_init(struct au0828_dev *dev,
struct usb_device *udev)
{
#ifdef CONFIG_MEDIA_CONTROLLER
struct media_device *mdev;
mdev = media_device_get_devres(&udev->dev);
if (!mdev)
return -ENOMEM;
/* check if media device is already initialized */
if (!mdev->dev)
media_device_usb_init(mdev, udev, udev->product);
dev->media_dev = mdev;
#endif
return 0;
}
static int au0828_media_device_register(struct au0828_dev *dev,
struct usb_device *udev)
{
#ifdef CONFIG_MEDIA_CONTROLLER
int ret;
if (dev->media_dev &&
!media_devnode_is_registered(&dev->media_dev->devnode)) {
/* register media device */
ret = media_device_register(dev->media_dev);
if (ret) {
dev_err(&udev->dev,
"Media Device Register Error: %d\n", ret);
return ret;
}
}
#endif
return 0;
}
static int au0828_usb_probe(struct usb_interface *interface,
const struct usb_device_id *id)
{
int ifnum;
int retval = 0;
struct au0828_dev *dev;
struct usb_device *usbdev = interface_to_usbdev(interface);
ifnum = interface->altsetting->desc.bInterfaceNumber;
if (ifnum != 0)
return -ENODEV;
dprintk(1, "%s() vendor id 0x%x device id 0x%x ifnum:%d\n", __func__,
le16_to_cpu(usbdev->descriptor.idVendor),
le16_to_cpu(usbdev->descriptor.idProduct),
ifnum);
/*
* Make sure we have 480 Mbps of bandwidth, otherwise things like
* video stream wouldn't likely work, since 12 Mbps is generally
* not enough even for most Digital TV streams.
*/
if (usbdev->speed != USB_SPEED_HIGH && disable_usb_speed_check == 0) {
pr_err("au0828: Device initialization failed.\n");
pr_err("au0828: Device must be connected to a high-speed USB 2.0 port.\n");
return -ENODEV;
}
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (dev == NULL) {
pr_err("%s() Unable to allocate memory\n", __func__);
return -ENOMEM;
}
mutex_init(&dev->lock);
mutex_lock(&dev->lock);
mutex_init(&dev->mutex);
mutex_init(&dev->dvb.lock);
dev->usbdev = usbdev;
dev->boardnr = id->driver_info;
dev->board = au0828_boards[dev->boardnr];
/* Initialize the media controller */
retval = au0828_media_device_init(dev, usbdev);
if (retval) {
pr_err("%s() au0828_media_device_init failed\n",
__func__);
mutex_unlock(&dev->lock);
kfree(dev);
return retval;
}
retval = au0828_v4l2_device_register(interface, dev);
if (retval) {
au0828_usb_v4l2_media_release(dev);
mutex_unlock(&dev->lock);
kfree(dev);
return retval;
}
/* Power Up the bridge */
au0828_write(dev, REG_600, 1 << 4);
/* Bring up the GPIO's and supporting devices */
au0828_gpio_setup(dev);
/* I2C */
au0828_i2c_register(dev);
/* Setup */
au0828_card_setup(dev);
/* Analog TV */
retval = au0828_analog_register(dev, interface);
if (retval) {
pr_err("%s() au0282_dev_register failed to register on V4L2\n",
__func__);
goto done;
}
/* Digital TV */
retval = au0828_dvb_register(dev);
if (retval)
pr_err("%s() au0282_dev_register failed\n",
__func__);
/* Remote controller */
au0828_rc_register(dev);
/*
* Store the pointer to the au0828_dev so it can be accessed in
* au0828_usb_disconnect
*/
usb_set_intfdata(interface, dev);
pr_info("Registered device AU0828 [%s]\n",
dev->board.name == NULL ? "Unset" : dev->board.name);
mutex_unlock(&dev->lock);
retval = au0828_media_device_register(dev, usbdev);
done:
if (retval < 0)
au0828_usb_disconnect(interface);
return retval;
}
static int au0828_suspend(struct usb_interface *interface,
pm_message_t message)
{
struct au0828_dev *dev = usb_get_intfdata(interface);
if (!dev)
return 0;
pr_info("Suspend\n");
au0828_rc_suspend(dev);
au0828_v4l2_suspend(dev);
au0828_dvb_suspend(dev);
/* FIXME: should suspend also ATV/DTV */
return 0;
}
static int au0828_resume(struct usb_interface *interface)
{
struct au0828_dev *dev = usb_get_intfdata(interface);
if (!dev)
return 0;
pr_info("Resume\n");
/* Power Up the bridge */
au0828_write(dev, REG_600, 1 << 4);
/* Bring up the GPIO's and supporting devices */
au0828_gpio_setup(dev);
au0828_rc_resume(dev);
au0828_v4l2_resume(dev);
au0828_dvb_resume(dev);
/* FIXME: should resume also ATV/DTV */
return 0;
}
static struct usb_driver au0828_usb_driver = {
.name = KBUILD_MODNAME,
.probe = au0828_usb_probe,
.disconnect = au0828_usb_disconnect,
.id_table = au0828_usb_id_table,
.suspend = au0828_suspend,
.resume = au0828_resume,
.reset_resume = au0828_resume,
};
static int __init au0828_init(void)
{
int ret;
if (au0828_debug & 1)
pr_info("%s() Debugging is enabled\n", __func__);
if (au0828_debug & 2)
pr_info("%s() USB Debugging is enabled\n", __func__);
if (au0828_debug & 4)
pr_info("%s() I2C Debugging is enabled\n", __func__);
if (au0828_debug & 8)
pr_info("%s() Bridge Debugging is enabled\n",
__func__);
if (au0828_debug & 16)
pr_info("%s() IR Debugging is enabled\n",
__func__);
pr_info("au0828 driver loaded\n");
ret = usb_register(&au0828_usb_driver);
if (ret)
pr_err("usb_register failed, error = %d\n", ret);
return ret;
}
static void __exit au0828_exit(void)
{
usb_deregister(&au0828_usb_driver);
}
module_init(au0828_init);
module_exit(au0828_exit);
MODULE_DESCRIPTION("Driver for Auvitek AU0828 based products");
MODULE_AUTHOR("Steven Toth <stoth@linuxtv.org>");
MODULE_LICENSE("GPL");
MODULE_VERSION("0.0.3");