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linux/drivers/media/usb/au0828/au0828-core.c

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/*
* 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 <linux/module.h>
#include <linux/slab.h>
#include <linux/videodev2.h>
#include <media/v4l2-common.h>
#include <linux/mutex.h>
#include "au0828.h"
/*
* 1 = General debug messages
* 2 = USB handling
* 4 = I2C related
* 8 = Bridge related
*/
int au0828_debug;
module_param_named(debug, au0828_debug, int, 0644);
MODULE_PARM_DESC(debug, "enable debug messages");
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) {
printk(KERN_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) {
printk(KERN_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_usb_release(struct au0828_dev *dev)
{
/* I2C */
au0828_i2c_unregister(dev);
kfree(dev);
}
#ifdef CONFIG_VIDEO_AU0828_V4L2
static void au0828_usb_v4l2_release(struct v4l2_device *v4l2_dev)
{
struct au0828_dev *dev =
container_of(v4l2_dev, struct au0828_dev, v4l2_dev);
v4l2_ctrl_handler_free(&dev->v4l2_ctrl_hdl);
v4l2_device_unregister(&dev->v4l2_dev);
au0828_usb_release(dev);
}
#endif
static void au0828_usb_disconnect(struct usb_interface *interface)
{
struct au0828_dev *dev = usb_get_intfdata(interface);
dprintk(1, "%s()\n", __func__);
/* Digital TV */
au0828_dvb_unregister(dev);
usb_set_intfdata(interface, NULL);
mutex_lock(&dev->mutex);
dev->usbdev = NULL;
mutex_unlock(&dev->mutex);
#ifdef CONFIG_VIDEO_AU0828_V4L2
if (AUVI_INPUT(0).type != AU0828_VMUX_UNDEFINED) {
au0828_analog_unregister(dev);
v4l2_device_disconnect(&dev->v4l2_dev);
v4l2_device_put(&dev->v4l2_dev);
return;
}
#endif
au0828_usb_release(dev);
}
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) {
printk(KERN_ERR "au0828: Device initialization failed.\n");
printk(KERN_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) {
printk(KERN_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;
#ifdef CONFIG_VIDEO_AU0828_V4L2
dev->v4l2_dev.release = au0828_usb_v4l2_release;
/* Create the v4l2_device */
retval = v4l2_device_register(&interface->dev, &dev->v4l2_dev);
if (retval) {
pr_err("%s() v4l2_device_register failed\n",
__func__);
mutex_unlock(&dev->lock);
kfree(dev);
return retval;
}
/* This control handler will inherit the controls from au8522 */
retval = v4l2_ctrl_handler_init(&dev->v4l2_ctrl_hdl, 4);
if (retval) {
pr_err("%s() v4l2_ctrl_handler_init failed\n",
__func__);
mutex_unlock(&dev->lock);
kfree(dev);
return retval;
}
dev->v4l2_dev.ctrl_handler = &dev->v4l2_ctrl_hdl;
#endif
/* 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);
#ifdef CONFIG_VIDEO_AU0828_V4L2
/* Analog TV */
if (AUVI_INPUT(0).type != AU0828_VMUX_UNDEFINED)
au0828_analog_register(dev, interface);
#endif
/* Digital TV */
retval = au0828_dvb_register(dev);
if (retval)
pr_err("%s() au0282_dev_register failed\n",
__func__);
/* Store the pointer to the au0828_dev so it can be accessed in
au0828_usb_disconnect */
usb_set_intfdata(interface, dev);
printk(KERN_INFO "Registered device AU0828 [%s]\n",
dev->board.name == NULL ? "Unset" : dev->board.name);
mutex_unlock(&dev->lock);
return retval;
}
static struct usb_driver au0828_usb_driver = {
.name = DRIVER_NAME,
.probe = au0828_usb_probe,
.disconnect = au0828_usb_disconnect,
.id_table = au0828_usb_id_table,
};
static int __init au0828_init(void)
{
int ret;
if (au0828_debug & 1)
printk(KERN_INFO "%s() Debugging is enabled\n", __func__);
if (au0828_debug & 2)
printk(KERN_INFO "%s() USB Debugging is enabled\n", __func__);
if (au0828_debug & 4)
printk(KERN_INFO "%s() I2C Debugging is enabled\n", __func__);
if (au0828_debug & 8)
printk(KERN_INFO "%s() Bridge Debugging is enabled\n",
__func__);
printk(KERN_INFO "au0828 driver loaded\n");
ret = usb_register(&au0828_usb_driver);
if (ret)
printk(KERN_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("0.0.2");
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