linux/drivers/media/video/au0828/au0828-core.c
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   1/*
   2 *  Driver for the Auvitek USB bridge
   3 *
   4 *  Copyright (c) 2008 Steven Toth <stoth@linuxtv.org>
   5 *
   6 *  This program is free software; you can redistribute it and/or modify
   7 *  it under the terms of the GNU General Public License as published by
   8 *  the Free Software Foundation; either version 2 of the License, or
   9 *  (at your option) any later version.
  10 *
  11 *  This program is distributed in the hope that it will be useful,
  12 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 *
  15 *  GNU General Public License for more details.
  16 *
  17 *  You should have received a copy of the GNU General Public License
  18 *  along with this program; if not, write to the Free Software
  19 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22#include <linux/module.h>
  23#include <linux/slab.h>
  24#include <linux/videodev2.h>
  25#include <media/v4l2-common.h>
  26#include <linux/mutex.h>
  27
  28#include "au0828.h"
  29
  30/*
  31 * 1 = General debug messages
  32 * 2 = USB handling
  33 * 4 = I2C related
  34 * 8 = Bridge related
  35 */
  36int au0828_debug;
  37module_param_named(debug, au0828_debug, int, 0644);
  38MODULE_PARM_DESC(debug, "enable debug messages");
  39
  40static unsigned int disable_usb_speed_check;
  41module_param(disable_usb_speed_check, int, 0444);
  42MODULE_PARM_DESC(disable_usb_speed_check,
  43                 "override min bandwidth requirement of 480M bps");
  44
  45#define _AU0828_BULKPIPE 0x03
  46#define _BULKPIPESIZE 0xffff
  47
  48static int send_control_msg(struct au0828_dev *dev, u16 request, u32 value,
  49        u16 index, unsigned char *cp, u16 size);
  50static int recv_control_msg(struct au0828_dev *dev, u16 request, u32 value,
  51        u16 index, unsigned char *cp, u16 size);
  52
  53/* USB Direction */
  54#define CMD_REQUEST_IN          0x00
  55#define CMD_REQUEST_OUT         0x01
  56
  57u32 au0828_readreg(struct au0828_dev *dev, u16 reg)
  58{
  59        recv_control_msg(dev, CMD_REQUEST_IN, 0, reg, dev->ctrlmsg, 1);
  60        dprintk(8, "%s(0x%04x) = 0x%02x\n", __func__, reg, dev->ctrlmsg[0]);
  61        return dev->ctrlmsg[0];
  62}
  63
  64u32 au0828_writereg(struct au0828_dev *dev, u16 reg, u32 val)
  65{
  66        dprintk(8, "%s(0x%04x, 0x%02x)\n", __func__, reg, val);
  67        return send_control_msg(dev, CMD_REQUEST_OUT, val, reg,
  68                                dev->ctrlmsg, 0);
  69}
  70
  71static void cmd_msg_dump(struct au0828_dev *dev)
  72{
  73        int i;
  74
  75        for (i = 0; i < sizeof(dev->ctrlmsg); i += 16)
  76                dprintk(2, "%s() %02x %02x %02x %02x %02x %02x %02x %02x "
  77                                "%02x %02x %02x %02x %02x %02x %02x %02x\n",
  78                        __func__,
  79                        dev->ctrlmsg[i+0], dev->ctrlmsg[i+1],
  80                        dev->ctrlmsg[i+2], dev->ctrlmsg[i+3],
  81                        dev->ctrlmsg[i+4], dev->ctrlmsg[i+5],
  82                        dev->ctrlmsg[i+6], dev->ctrlmsg[i+7],
  83                        dev->ctrlmsg[i+8], dev->ctrlmsg[i+9],
  84                        dev->ctrlmsg[i+10], dev->ctrlmsg[i+11],
  85                        dev->ctrlmsg[i+12], dev->ctrlmsg[i+13],
  86                        dev->ctrlmsg[i+14], dev->ctrlmsg[i+15]);
  87}
  88
  89static int send_control_msg(struct au0828_dev *dev, u16 request, u32 value,
  90        u16 index, unsigned char *cp, u16 size)
  91{
  92        int status = -ENODEV;
  93        mutex_lock(&dev->mutex);
  94        if (dev->usbdev) {
  95
  96                /* cp must be memory that has been allocated by kmalloc */
  97                status = usb_control_msg(dev->usbdev,
  98                                usb_sndctrlpipe(dev->usbdev, 0),
  99                                request,
 100                                USB_DIR_OUT | USB_TYPE_VENDOR |
 101                                        USB_RECIP_DEVICE,
 102                                value, index,
 103                                cp, size, 1000);
 104
 105                status = min(status, 0);
 106
 107                if (status < 0) {
 108                        printk(KERN_ERR "%s() Failed sending control message, error %d.\n",
 109                                __func__, status);
 110                }
 111
 112        }
 113        mutex_unlock(&dev->mutex);
 114        return status;
 115}
 116
 117static int recv_control_msg(struct au0828_dev *dev, u16 request, u32 value,
 118        u16 index, unsigned char *cp, u16 size)
 119{
 120        int status = -ENODEV;
 121        mutex_lock(&dev->mutex);
 122        if (dev->usbdev) {
 123
 124                memset(dev->ctrlmsg, 0, sizeof(dev->ctrlmsg));
 125
 126                /* cp must be memory that has been allocated by kmalloc */
 127                status = usb_control_msg(dev->usbdev,
 128                                usb_rcvctrlpipe(dev->usbdev, 0),
 129                                request,
 130                                USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 131                                value, index,
 132                                cp, size, 1000);
 133
 134                status = min(status, 0);
 135
 136                if (status < 0) {
 137                        printk(KERN_ERR "%s() Failed receiving control message, error %d.\n",
 138                                __func__, status);
 139                } else
 140                        cmd_msg_dump(dev);
 141        }
 142        mutex_unlock(&dev->mutex);
 143        return status;
 144}
 145
 146static void au0828_usb_disconnect(struct usb_interface *interface)
 147{
 148        struct au0828_dev *dev = usb_get_intfdata(interface);
 149
 150        dprintk(1, "%s()\n", __func__);
 151
 152        /* Digital TV */
 153        au0828_dvb_unregister(dev);
 154
 155        if (AUVI_INPUT(0).type != AU0828_VMUX_UNDEFINED)
 156                au0828_analog_unregister(dev);
 157
 158        /* I2C */
 159        au0828_i2c_unregister(dev);
 160
 161        v4l2_device_unregister(&dev->v4l2_dev);
 162
 163        usb_set_intfdata(interface, NULL);
 164
 165        mutex_lock(&dev->mutex);
 166        dev->usbdev = NULL;
 167        mutex_unlock(&dev->mutex);
 168
 169        kfree(dev);
 170
 171}
 172
 173static int au0828_usb_probe(struct usb_interface *interface,
 174        const struct usb_device_id *id)
 175{
 176        int ifnum, retval;
 177        struct au0828_dev *dev;
 178        struct usb_device *usbdev = interface_to_usbdev(interface);
 179
 180        ifnum = interface->altsetting->desc.bInterfaceNumber;
 181
 182        if (ifnum != 0)
 183                return -ENODEV;
 184
 185        dprintk(1, "%s() vendor id 0x%x device id 0x%x ifnum:%d\n", __func__,
 186                le16_to_cpu(usbdev->descriptor.idVendor),
 187                le16_to_cpu(usbdev->descriptor.idProduct),
 188                ifnum);
 189
 190        /*
 191         * Make sure we have 480 Mbps of bandwidth, otherwise things like
 192         * video stream wouldn't likely work, since 12 Mbps is generally
 193         * not enough even for most Digital TV streams.
 194         */
 195        if (usbdev->speed != USB_SPEED_HIGH && disable_usb_speed_check == 0) {
 196                printk(KERN_ERR "au0828: Device initialization failed.\n");
 197                printk(KERN_ERR "au0828: Device must be connected to a "
 198                       "high-speed USB 2.0 port.\n");
 199                return -ENODEV;
 200        }
 201
 202        dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 203        if (dev == NULL) {
 204                printk(KERN_ERR "%s() Unable to allocate memory\n", __func__);
 205                return -ENOMEM;
 206        }
 207
 208        mutex_init(&dev->mutex);
 209        mutex_init(&dev->dvb.lock);
 210        dev->usbdev = usbdev;
 211        dev->boardnr = id->driver_info;
 212
 213        /* Create the v4l2_device */
 214        retval = v4l2_device_register(&interface->dev, &dev->v4l2_dev);
 215        if (retval) {
 216                printk(KERN_ERR "%s() v4l2_device_register failed\n",
 217                       __func__);
 218                kfree(dev);
 219                return -EIO;
 220        }
 221
 222        /* Power Up the bridge */
 223        au0828_write(dev, REG_600, 1 << 4);
 224
 225        /* Bring up the GPIO's and supporting devices */
 226        au0828_gpio_setup(dev);
 227
 228        /* I2C */
 229        au0828_i2c_register(dev);
 230
 231        /* Setup */
 232        au0828_card_setup(dev);
 233
 234        /* Analog TV */
 235        if (AUVI_INPUT(0).type != AU0828_VMUX_UNDEFINED)
 236                au0828_analog_register(dev, interface);
 237
 238        /* Digital TV */
 239        au0828_dvb_register(dev);
 240
 241        /* Store the pointer to the au0828_dev so it can be accessed in
 242           au0828_usb_disconnect */
 243        usb_set_intfdata(interface, dev);
 244
 245        printk(KERN_INFO "Registered device AU0828 [%s]\n",
 246                dev->board.name == NULL ? "Unset" : dev->board.name);
 247
 248        return 0;
 249}
 250
 251static struct usb_driver au0828_usb_driver = {
 252        .name           = DRIVER_NAME,
 253        .probe          = au0828_usb_probe,
 254        .disconnect     = au0828_usb_disconnect,
 255        .id_table       = au0828_usb_id_table,
 256};
 257
 258static int __init au0828_init(void)
 259{
 260        int ret;
 261
 262        if (au0828_debug & 1)
 263                printk(KERN_INFO "%s() Debugging is enabled\n", __func__);
 264
 265        if (au0828_debug & 2)
 266                printk(KERN_INFO "%s() USB Debugging is enabled\n", __func__);
 267
 268        if (au0828_debug & 4)
 269                printk(KERN_INFO "%s() I2C Debugging is enabled\n", __func__);
 270
 271        if (au0828_debug & 8)
 272                printk(KERN_INFO "%s() Bridge Debugging is enabled\n",
 273                       __func__);
 274
 275        printk(KERN_INFO "au0828 driver loaded\n");
 276
 277        ret = usb_register(&au0828_usb_driver);
 278        if (ret)
 279                printk(KERN_ERR "usb_register failed, error = %d\n", ret);
 280
 281        return ret;
 282}
 283
 284static void __exit au0828_exit(void)
 285{
 286        usb_deregister(&au0828_usb_driver);
 287}
 288
 289module_init(au0828_init);
 290module_exit(au0828_exit);
 291
 292MODULE_DESCRIPTION("Driver for Auvitek AU0828 based products");
 293MODULE_AUTHOR("Steven Toth <stoth@linuxtv.org>");
 294MODULE_LICENSE("GPL");
 295MODULE_VERSION("0.0.2");
 296