drivers/media/video/au0828/au0828-core.c

   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  */
  36 int au0828_debug;
  37 module_param_named(debug, au0828_debug, int, 0644);
  38 MODULE_PARM_DESC(debug, "enable debug messages");
  39
  40 static unsigned int disable_usb_speed_check;
  41 module_param(disable_usb_speed_check, int, 0444);
  42 MODULE_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
  48 static int send_control_msg(struct au0828_dev *dev, u16 request, u32 value,
  49         u16 index, unsigned char *cp, u16 size);
  50 static 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
  57 u32 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
  64 u32 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
  71 static 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
  89 static 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
 117 static 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
 146 static 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
 173 static 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
 251 static 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
 258 static 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
 284 static void __exit au0828_exit(void)
 285 {
 286         usb_deregister(&au0828_usb_driver);
 287 }
 288
 289 module_init(au0828_init);
 290 module_exit(au0828_exit);
 291
 292 MODULE_DESCRIPTION("Driver for Auvitek AU0828 based products");
 293 MODULE_AUTHOR("Steven Toth <stoth@linuxtv.org>");
 294 MODULE_LICENSE("GPL");