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/videodev2.h>
  24 #include <media/v4l2-common.h>
  25 #include <linux/mutex.h>
  26
  27 #include "au0828.h"
  28
  29 /*
  30  * 1 = General debug messages
  31  * 2 = USB handling
  32  * 4 = I2C related
  33  * 8 = Bridge related
  34  */
  35 int au0828_debug;
  36 module_param_named(debug, au0828_debug, int, 0644);
  37 MODULE_PARM_DESC(debug, "enable debug messages");
  38
  39 static unsigned int disable_usb_speed_check;
  40 module_param(disable_usb_speed_check, int, 0444);
  41 MODULE_PARM_DESC(disable_usb_speed_check,
  42                  "override min bandwidth requirement of 480M bps");
  43
  44 #define _AU0828_BULKPIPE 0x03
  45 #define _BULKPIPESIZE 0xffff
  46
  47 static int send_control_msg(struct au0828_dev *dev, u16 request, u32 value,
  48         u16 index, unsigned char *cp, u16 size);
  49 static int recv_control_msg(struct au0828_dev *dev, u16 request, u32 value,
  50         u16 index, unsigned char *cp, u16 size);
  51
  52 /* USB Direction */
  53 #define CMD_REQUEST_IN          0x00
  54 #define CMD_REQUEST_OUT         0x01
  55
  56 u32 au0828_readreg(struct au0828_dev *dev, u16 reg)
  57 {
  58         recv_control_msg(dev, CMD_REQUEST_IN, 0, reg, dev->ctrlmsg, 1);
  59         dprintk(8, "%s(0x%04x) = 0x%02x\n", __func__, reg, dev->ctrlmsg[0]);
  60         return dev->ctrlmsg[0];
  61 }
  62
  63 u32 au0828_writereg(struct au0828_dev *dev, u16 reg, u32 val)
  64 {
  65         dprintk(8, "%s(0x%04x, 0x%02x)\n", __func__, reg, val);
  66         return send_control_msg(dev, CMD_REQUEST_OUT, val, reg,
  67                                 dev->ctrlmsg, 0);
  68 }
  69
  70 static void cmd_msg_dump(struct au0828_dev *dev)
  71 {
  72         int i;
  73
  74         for (i = 0; i < sizeof(dev->ctrlmsg); i += 16)
  75                 dprintk(2, "%s() %02x %02x %02x %02x %02x %02x %02x %02x "
  76                                 "%02x %02x %02x %02x %02x %02x %02x %02x\n",
  77                         __func__,
  78                         dev->ctrlmsg[i+0], dev->ctrlmsg[i+1],
  79                         dev->ctrlmsg[i+2], dev->ctrlmsg[i+3],
  80                         dev->ctrlmsg[i+4], dev->ctrlmsg[i+5],
  81                         dev->ctrlmsg[i+6], dev->ctrlmsg[i+7],
  82                         dev->ctrlmsg[i+8], dev->ctrlmsg[i+9],
  83                         dev->ctrlmsg[i+10], dev->ctrlmsg[i+11],
  84                         dev->ctrlmsg[i+12], dev->ctrlmsg[i+13],
  85                         dev->ctrlmsg[i+14], dev->ctrlmsg[i+15]);
  86 }
  87
  88 static int send_control_msg(struct au0828_dev *dev, u16 request, u32 value,
  89         u16 index, unsigned char *cp, u16 size)
  90 {
  91         int status = -ENODEV;
  92         mutex_lock(&dev->mutex);
  93         if (dev->usbdev) {
  94
  95                 /* cp must be memory that has been allocated by kmalloc */
  96                 status = usb_control_msg(dev->usbdev,
  97                                 usb_sndctrlpipe(dev->usbdev, 0),
  98                                 request,
  99                                 USB_DIR_OUT | USB_TYPE_VENDOR |
 100                                         USB_RECIP_DEVICE,
 101                                 value, index,
 102                                 cp, size, 1000);
 103
 104                 status = min(status, 0);
 105
 106                 if (status < 0) {
 107                         printk(KERN_ERR "%s() Failed sending control message, error %d.\n",
 108                                 __func__, status);
 109                 }
 110
 111         }
 112         mutex_unlock(&dev->mutex);
 113         return status;
 114 }
 115
 116 static int recv_control_msg(struct au0828_dev *dev, u16 request, u32 value,
 117         u16 index, unsigned char *cp, u16 size)
 118 {
 119         int status = -ENODEV;
 120         mutex_lock(&dev->mutex);
 121         if (dev->usbdev) {
 122
 123                 memset(dev->ctrlmsg, 0, sizeof(dev->ctrlmsg));
 124
 125                 /* cp must be memory that has been allocated by kmalloc */
 126                 status = usb_control_msg(dev->usbdev,
 127                                 usb_rcvctrlpipe(dev->usbdev, 0),
 128                                 request,
 129                                 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 130                                 value, index,
 131                                 cp, size, 1000);
 132
 133                 status = min(status, 0);
 134
 135                 if (status < 0) {
 136                         printk(KERN_ERR "%s() Failed receiving control message, error %d.\n",
 137                                 __func__, status);
 138                 } else
 139                         cmd_msg_dump(dev);
 140         }
 141         mutex_unlock(&dev->mutex);
 142         return status;
 143 }
 144
 145 static void au0828_usb_disconnect(struct usb_interface *interface)
 146 {
 147         struct au0828_dev *dev = usb_get_intfdata(interface);
 148
 149         dprintk(1, "%s()\n", __func__);
 150
 151         /* Digital TV */
 152         au0828_dvb_unregister(dev);
 153
 154         if (AUVI_INPUT(0).type != AU0828_VMUX_UNDEFINED)
 155                 au0828_analog_unregister(dev);
 156
 157         /* I2C */
 158         au0828_i2c_unregister(dev);
 159
 160         v4l2_device_unregister(&dev->v4l2_dev);
 161
 162         usb_set_intfdata(interface, NULL);
 163
 164         mutex_lock(&dev->mutex);
 165         dev->usbdev = NULL;
 166         mutex_unlock(&dev->mutex);
 167
 168         kfree(dev);
 169
 170 }
 171
 172 static int au0828_usb_probe(struct usb_interface *interface,
 173         const struct usb_device_id *id)
 174 {
 175         int ifnum, retval;
 176         struct au0828_dev *dev;
 177         struct usb_device *usbdev = interface_to_usbdev(interface);
 178
 179         ifnum = interface->altsetting->desc.bInterfaceNumber;
 180
 181         if (ifnum != 0)
 182                 return -ENODEV;
 183
 184         dprintk(1, "%s() vendor id 0x%x device id 0x%x ifnum:%d\n", __func__,
 185                 le16_to_cpu(usbdev->descriptor.idVendor),
 186                 le16_to_cpu(usbdev->descriptor.idProduct),
 187                 ifnum);
 188
 189         /*
 190          * Make sure we have 480 Mbps of bandwidth, otherwise things like
 191          * video stream wouldn't likely work, since 12 Mbps is generally
 192          * not enough even for most Digital TV streams.
 193          */
 194         if (usbdev->speed != USB_SPEED_HIGH && disable_usb_speed_check == 0) {
 195                 printk(KERN_ERR "au0828: Device initialization failed.\n");
 196                 printk(KERN_ERR "au0828: Device must be connected to a "
 197                        "high-speed USB 2.0 port.\n");
 198                 return -ENODEV;
 199         }
 200
 201         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 202         if (dev == NULL) {
 203                 printk(KERN_ERR "%s() Unable to allocate memory\n", __func__);
 204                 return -ENOMEM;
 205         }
 206
 207         mutex_init(&dev->mutex);
 208         mutex_init(&dev->dvb.lock);
 209         dev->usbdev = usbdev;
 210         dev->boardnr = id->driver_info;
 211
 212         /* Create the v4l2_device */
 213         retval = v4l2_device_register(&interface->dev, &dev->v4l2_dev);
 214         if (retval) {
 215                 printk(KERN_ERR "%s() v4l2_device_register failed\n",
 216                        __func__);
 217                 kfree(dev);
 218                 return -EIO;
 219         }
 220
 221         /* Power Up the bridge */
 222         au0828_write(dev, REG_600, 1 << 4);
 223
 224         /* Bring up the GPIO's and supporting devices */
 225         au0828_gpio_setup(dev);
 226
 227         /* I2C */
 228         au0828_i2c_register(dev);
 229
 230         /* Setup */
 231         au0828_card_setup(dev);
 232
 233         /* Analog TV */
 234         if (AUVI_INPUT(0).type != AU0828_VMUX_UNDEFINED)
 235                 au0828_analog_register(dev, interface);
 236
 237         /* Digital TV */
 238         au0828_dvb_register(dev);
 239
 240         /* Store the pointer to the au0828_dev so it can be accessed in
 241            au0828_usb_disconnect */
 242         usb_set_intfdata(interface, dev);
 243
 244         printk(KERN_INFO "Registered device AU0828 [%s]\n",
 245                 dev->board.name == NULL ? "Unset" : dev->board.name);
 246
 247         return 0;
 248 }
 249
 250 static struct usb_driver au0828_usb_driver = {
 251         .name           = DRIVER_NAME,
 252         .probe          = au0828_usb_probe,
 253         .disconnect     = au0828_usb_disconnect,
 254         .id_table       = au0828_usb_id_table,
 255 };
 256
 257 static int __init au0828_init(void)
 258 {
 259         int ret;
 260
 261         if (au0828_debug & 1)
 262                 printk(KERN_INFO "%s() Debugging is enabled\n", __func__);
 263
 264         if (au0828_debug & 2)
 265                 printk(KERN_INFO "%s() USB Debugging is enabled\n", __func__);
 266
 267         if (au0828_debug & 4)
 268                 printk(KERN_INFO "%s() I2C Debugging is enabled\n", __func__);
 269
 270         if (au0828_debug & 8)
 271                 printk(KERN_INFO "%s() Bridge Debugging is enabled\n",
 272                        __func__);
 273
 274         printk(KERN_INFO "au0828 driver loaded\n");
 275
 276         ret = usb_register(&au0828_usb_driver);
 277         if (ret)
 278                 printk(KERN_ERR "usb_register failed, error = %d\n", ret);
 279
 280         return ret;
 281 }
 282
 283 static void __exit au0828_exit(void)
 284 {
 285         usb_deregister(&au0828_usb_driver);
 286 }
 287
 288 module_init(au0828_init);
 289 module_exit(au0828_exit);
 290
 291 MODULE_DESCRIPTION("Driver for Auvitek AU0828 based products");
 292 MODULE_AUTHOR("Steven Toth <stoth@linuxtv.org>");
 293 MODULE_LICENSE("GPL");