au0828-core.c

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/*
 *  Driver for the Auvitek USB bridge
 *
 *  Copyright (c) 2008 Steven Toth <[email protected]>
 *
 *  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_disconnect(struct usb_interface *interface)
{
    struct au0828_dev *dev = usb_get_intfdata(interface);

    dprintk(1, "%s()\n", __func__);

    /* Digital TV */
    au0828_dvb_unregister(dev);

    if (AUVI_INPUT(0).type != AU0828_VMUX_UNDEFINED)
        au0828_analog_unregister(dev);

    /* I2C */
    au0828_i2c_unregister(dev);

    v4l2_device_unregister(&dev->v4l2_dev);

    usb_set_intfdata(interface, NULL);

    mutex_lock(&dev->mutex);
    dev->usbdev = NULL;
    mutex_unlock(&dev->mutex);

    kfree(dev);

}

static int au0828_usb_probe(struct usb_interface *interface,
    const struct usb_device_id *id)
{
    int ifnum, retval;
    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;

    /* Create the v4l2_device */
    retval = v4l2_device_register(&interface->dev, &dev->v4l2_dev);
    if (retval) {
        printk(KERN_ERR "%s() v4l2_device_register failed\n",
               __func__);
        mutex_unlock(&dev->lock);
        kfree(dev);
        return -EIO;
    }

    /* 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 */
    if (AUVI_INPUT(0).type != AU0828_VMUX_UNDEFINED)
        au0828_analog_register(dev, interface);

    /* 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 <[email protected]>");
MODULE_LICENSE("GPL");
MODULE_VERSION("0.0.2");