drivers/media/usb/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);
  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         u8 result = 0;
  60
  61         recv_control_msg(dev, CMD_REQUEST_IN, 0, reg, &result, 1);
  62         dprintk(8, "%s(0x%04x) = 0x%02x\n", __func__, reg, result);
  63
  64         return result;
  65 }
  66
  67 u32 au0828_writereg(struct au0828_dev *dev, u16 reg, u32 val)
  68 {
  69         dprintk(8, "%s(0x%04x, 0x%02x)\n", __func__, reg, val);
  70         return send_control_msg(dev, CMD_REQUEST_OUT, val, reg);
  71 }
  72
  73 static int send_control_msg(struct au0828_dev *dev, u16 request, u32 value,
  74         u16 index)
  75 {
  76         int status = -ENODEV;
  77
  78         if (dev->usbdev) {
  79
  80                 /* cp must be memory that has been allocated by kmalloc */
  81                 status = usb_control_msg(dev->usbdev,
  82                                 usb_sndctrlpipe(dev->usbdev, 0),
  83                                 request,
  84                                 USB_DIR_OUT | USB_TYPE_VENDOR |
  85                                         USB_RECIP_DEVICE,
  86                                 value, index, NULL, 0, 1000);
  87
  88                 status = min(status, 0);
  89
  90                 if (status < 0) {
  91                         printk(KERN_ERR "%s() Failed sending control message, error %d.\n",
  92                                 __func__, status);
  93                 }
  94
  95         }
  96
  97         return status;
  98 }
  99
 100 static int recv_control_msg(struct au0828_dev *dev, u16 request, u32 value,
 101         u16 index, unsigned char *cp, u16 size)
 102 {
 103         int status = -ENODEV;
 104         mutex_lock(&dev->mutex);
 105         if (dev->usbdev) {
 106                 status = usb_control_msg(dev->usbdev,
 107                                 usb_rcvctrlpipe(dev->usbdev, 0),
 108                                 request,
 109                                 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 110                                 value, index,
 111                                 dev->ctrlmsg, size, 1000);
 112
 113                 status = min(status, 0);
 114
 115                 if (status < 0) {
 116                         printk(KERN_ERR "%s() Failed receiving control message, error %d.\n",
 117                                 __func__, status);
 118                 }
 119
 120                 /* the host controller requires heap allocated memory, which
 121                    is why we didn't just pass "cp" into usb_control_msg */
 122                 memcpy(cp, dev->ctrlmsg, size);
 123         }
 124         mutex_unlock(&dev->mutex);
 125         return status;
 126 }
 127
 128 static void au0828_usb_disconnect(struct usb_interface *interface)
 129 {
 130         struct au0828_dev *dev = usb_get_intfdata(interface);
 131
 132         dprintk(1, "%s()\n", __func__);
 133
 134         /* Digital TV */
 135         au0828_dvb_unregister(dev);
 136
 137         if (AUVI_INPUT(0).type != AU0828_VMUX_UNDEFINED)
 138                 au0828_analog_unregister(dev);
 139
 140         /* I2C */
 141         au0828_i2c_unregister(dev);
 142
 143         v4l2_device_unregister(&dev->v4l2_dev);
 144
 145         usb_set_intfdata(interface, NULL);
 146
 147         mutex_lock(&dev->mutex);
 148         dev->usbdev = NULL;
 149         mutex_unlock(&dev->mutex);
 150
 151         kfree(dev);
 152
 153 }
 154
 155 static int au0828_usb_probe(struct usb_interface *interface,
 156         const struct usb_device_id *id)
 157 {
 158         int ifnum, retval;
 159         struct au0828_dev *dev;
 160         struct usb_device *usbdev = interface_to_usbdev(interface);
 161
 162         ifnum = interface->altsetting->desc.bInterfaceNumber;
 163
 164         if (ifnum != 0)
 165                 return -ENODEV;
 166
 167         dprintk(1, "%s() vendor id 0x%x device id 0x%x ifnum:%d\n", __func__,
 168                 le16_to_cpu(usbdev->descriptor.idVendor),
 169                 le16_to_cpu(usbdev->descriptor.idProduct),
 170                 ifnum);
 171
 172         /*
 173          * Make sure we have 480 Mbps of bandwidth, otherwise things like
 174          * video stream wouldn't likely work, since 12 Mbps is generally
 175          * not enough even for most Digital TV streams.
 176          */
 177         if (usbdev->speed != USB_SPEED_HIGH && disable_usb_speed_check == 0) {
 178                 printk(KERN_ERR "au0828: Device initialization failed.\n");
 179                 printk(KERN_ERR "au0828: Device must be connected to a "
 180                        "high-speed USB 2.0 port.\n");
 181                 return -ENODEV;
 182         }
 183
 184         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 185         if (dev == NULL) {
 186                 printk(KERN_ERR "%s() Unable to allocate memory\n", __func__);
 187                 return -ENOMEM;
 188         }
 189
 190         mutex_init(&dev->lock);
 191         mutex_lock(&dev->lock);
 192         mutex_init(&dev->mutex);
 193         mutex_init(&dev->dvb.lock);
 194         dev->usbdev = usbdev;
 195         dev->boardnr = id->driver_info;
 196
 197         /* Create the v4l2_device */
 198         retval = v4l2_device_register(&interface->dev, &dev->v4l2_dev);
 199         if (retval) {
 200                 printk(KERN_ERR "%s() v4l2_device_register failed\n",
 201                        __func__);
 202                 mutex_unlock(&dev->lock);
 203                 kfree(dev);
 204                 return -EIO;
 205         }
 206
 207         /* Power Up the bridge */
 208         au0828_write(dev, REG_600, 1 << 4);
 209
 210         /* Bring up the GPIO's and supporting devices */
 211         au0828_gpio_setup(dev);
 212
 213         /* I2C */
 214         au0828_i2c_register(dev);
 215
 216         /* Setup */
 217         au0828_card_setup(dev);
 218
 219         /* Analog TV */
 220         if (AUVI_INPUT(0).type != AU0828_VMUX_UNDEFINED)
 221                 au0828_analog_register(dev, interface);
 222
 223         /* Digital TV */
 224         au0828_dvb_register(dev);
 225
 226         /* Store the pointer to the au0828_dev so it can be accessed in
 227            au0828_usb_disconnect */
 228         usb_set_intfdata(interface, dev);
 229
 230         printk(KERN_INFO "Registered device AU0828 [%s]\n",
 231                 dev->board.name == NULL ? "Unset" : dev->board.name);
 232
 233         mutex_unlock(&dev->lock);
 234
 235         return 0;
 236 }
 237
 238 static struct usb_driver au0828_usb_driver = {
 239         .name           = DRIVER_NAME,
 240         .probe          = au0828_usb_probe,
 241         .disconnect     = au0828_usb_disconnect,
 242         .id_table       = au0828_usb_id_table,
 243 };
 244
 245 static int __init au0828_init(void)
 246 {
 247         int ret;
 248
 249         if (au0828_debug & 1)
 250                 printk(KERN_INFO "%s() Debugging is enabled\n", __func__);
 251
 252         if (au0828_debug & 2)
 253                 printk(KERN_INFO "%s() USB Debugging is enabled\n", __func__);
 254
 255         if (au0828_debug & 4)
 256                 printk(KERN_INFO "%s() I2C Debugging is enabled\n", __func__);
 257
 258         if (au0828_debug & 8)
 259                 printk(KERN_INFO "%s() Bridge Debugging is enabled\n",
 260                        __func__);
 261
 262         printk(KERN_INFO "au0828 driver loaded\n");
 263
 264         ret = usb_register(&au0828_usb_driver);
 265         if (ret)
 266                 printk(KERN_ERR "usb_register failed, error = %d\n", ret);
 267
 268         return ret;
 269 }
 270
 271 static void __exit au0828_exit(void)
 272 {
 273         usb_deregister(&au0828_usb_driver);
 274 }
 275
 276 module_init(au0828_init);
 277 module_exit(au0828_exit);
 278
 279 MODULE_DESCRIPTION("Driver for Auvitek AU0828 based products");
 280 MODULE_AUTHOR("Steven Toth <stoth@linuxtv.org>");
 281 MODULE_LICENSE("GPL");
 282 MODULE_VERSION("0.0.2");