drivers/media/usb/au0828/au0828-core.c - linux - Git at Google

 /*
  *  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;
 #ifdef CONFIG_VIDEO_AU0828_V4L2
 	int retval;
 #endif
 	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 */
 	au0828_dvb_register(dev);

 	/* 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 0;
 }

 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");
	/*
	* 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;
	#ifdef CONFIG_VIDEO_AU0828_V4L2
	int retval;
	#endif
	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 */
	au0828_dvb_register(dev);

	/* 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 0;
	}

	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");