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 #define _AU0828_BULKPIPE 0x03
  40 #define _BULKPIPESIZE 0xffff
  41
  42 static int send_control_msg(struct au0828_dev *dev, u16 request, u32 value,
  43         u16 index, unsigned char *cp, u16 size);
  44 static int recv_control_msg(struct au0828_dev *dev, u16 request, u32 value,
  45         u16 index, unsigned char *cp, u16 size);
  46
  47 /* USB Direction */
  48 #define CMD_REQUEST_IN          0x00
  49 #define CMD_REQUEST_OUT         0x01
  50
  51 u32 au0828_readreg(struct au0828_dev *dev, u16 reg)
  52 {
  53         recv_control_msg(dev, CMD_REQUEST_IN, 0, reg, dev->ctrlmsg, 1);
  54         dprintk(8, "%s(0x%x) = 0x%x\n", __func__, reg, dev->ctrlmsg[0]);
  55         return dev->ctrlmsg[0];
  56 }
  57
  58 u32 au0828_writereg(struct au0828_dev *dev, u16 reg, u32 val)
  59 {
  60         dprintk(8, "%s(0x%x, 0x%x)\n", __func__, reg, val);
  61         return send_control_msg(dev, CMD_REQUEST_OUT, val, reg,
  62                                 dev->ctrlmsg, 0);
  63 }
  64
  65 static void cmd_msg_dump(struct au0828_dev *dev)
  66 {
  67         int i;
  68
  69         for (i = 0; i < sizeof(dev->ctrlmsg); i += 16)
  70                 dprintk(2, "%s() %02x %02x %02x %02x %02x %02x %02x %02x "
  71                                 "%02x %02x %02x %02x %02x %02x %02x %02x\n",
  72                         __func__,
  73                         dev->ctrlmsg[i+0], dev->ctrlmsg[i+1],
  74                         dev->ctrlmsg[i+2], dev->ctrlmsg[i+3],
  75                         dev->ctrlmsg[i+4], dev->ctrlmsg[i+5],
  76                         dev->ctrlmsg[i+6], dev->ctrlmsg[i+7],
  77                         dev->ctrlmsg[i+8], dev->ctrlmsg[i+9],
  78                         dev->ctrlmsg[i+10], dev->ctrlmsg[i+11],
  79                         dev->ctrlmsg[i+12], dev->ctrlmsg[i+13],
  80                         dev->ctrlmsg[i+14], dev->ctrlmsg[i+15]);
  81 }
  82
  83 static int send_control_msg(struct au0828_dev *dev, u16 request, u32 value,
  84         u16 index, unsigned char *cp, u16 size)
  85 {
  86         int status = -ENODEV;
  87         mutex_lock(&dev->mutex);
  88         if (dev->usbdev) {
  89
  90                 /* cp must be memory that has been allocated by kmalloc */
  91                 status = usb_control_msg(dev->usbdev,
  92                                 usb_sndctrlpipe(dev->usbdev, 0),
  93                                 request,
  94                                 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  95                                 value, index,
  96                                 cp, size, 1000);
  97
  98                 status = min(status, 0);
  99
 100                 if (status < 0) {
 101                         printk(KERN_ERR "%s() Failed sending control message, error %d.\n",
 102                                 __func__, status);
 103                 }
 104
 105         }
 106         mutex_unlock(&dev->mutex);
 107         return status;
 108 }
 109
 110 static int recv_control_msg(struct au0828_dev *dev, u16 request, u32 value,
 111         u16 index, unsigned char *cp, u16 size)
 112 {
 113         int status = -ENODEV;
 114         mutex_lock(&dev->mutex);
 115         if (dev->usbdev) {
 116
 117                 memset(dev->ctrlmsg, 0, sizeof(dev->ctrlmsg));
 118
 119                 /* cp must be memory that has been allocated by kmalloc */
 120                 status = usb_control_msg(dev->usbdev,
 121                                 usb_rcvctrlpipe(dev->usbdev, 0),
 122                                 request,
 123                                 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 124                                 value, index,
 125                                 cp, size, 1000);
 126
 127                 status = min(status, 0);
 128
 129                 if (status < 0) {
 130                         printk(KERN_ERR "%s() Failed receiving control message, error %d.\n",
 131                                 __func__, status);
 132                 } else
 133                         cmd_msg_dump(dev);
 134         }
 135         mutex_unlock(&dev->mutex);
 136         return status;
 137 }
 138
 139 static void au0828_usb_disconnect(struct usb_interface *interface)
 140 {
 141         struct au0828_dev *dev = usb_get_intfdata(interface);
 142
 143         dprintk(1, "%s()\n", __func__);
 144
 145         /* Digital TV */
 146         au0828_dvb_unregister(dev);
 147
 148         /* I2C */
 149         au0828_i2c_unregister(dev);
 150
 151         usb_set_intfdata(interface, NULL);
 152
 153         mutex_lock(&dev->mutex);
 154         dev->usbdev = NULL;
 155         mutex_unlock(&dev->mutex);
 156
 157         kfree(dev);
 158
 159 }
 160
 161 static int au0828_usb_probe(struct usb_interface *interface,
 162         const struct usb_device_id *id)
 163 {
 164         int ifnum;
 165         struct au0828_dev *dev;
 166         struct usb_device *usbdev = interface_to_usbdev(interface);
 167
 168         ifnum = interface->altsetting->desc.bInterfaceNumber;
 169
 170         if (ifnum != 0)
 171                 return -ENODEV;
 172
 173         dprintk(1, "%s() vendor id 0x%x device id 0x%x ifnum:%d\n", __func__,
 174                 le16_to_cpu(usbdev->descriptor.idVendor),
 175                 le16_to_cpu(usbdev->descriptor.idProduct),
 176                 ifnum);
 177
 178         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 179         if (dev == NULL) {
 180                 printk(KERN_ERR "%s() Unable to allocate memory\n", __func__);
 181                 return -ENOMEM;
 182         }
 183
 184         mutex_init(&dev->mutex);
 185         mutex_init(&dev->dvb.lock);
 186         dev->usbdev = usbdev;
 187         dev->board = id->driver_info;
 188
 189         usb_set_intfdata(interface, dev);
 190
 191         /* Power Up the bridge */
 192         au0828_write(dev, REG_600, 1 << 4);
 193
 194         /* Bring up the GPIO's and supporting devices */
 195         au0828_gpio_setup(dev);
 196
 197         /* I2C */
 198         au0828_i2c_register(dev);
 199
 200         /* Setup */
 201         au0828_card_setup(dev);
 202
 203         /* Digital TV */
 204         au0828_dvb_register(dev);
 205
 206         printk(KERN_INFO "Registered device AU0828 [%s]\n",
 207                 au0828_boards[dev->board].name == NULL ? "Unset" :
 208                 au0828_boards[dev->board].name);
 209
 210         return 0;
 211 }
 212
 213 static struct usb_driver au0828_usb_driver = {
 214         .name           = DRIVER_NAME,
 215         .probe          = au0828_usb_probe,
 216         .disconnect     = au0828_usb_disconnect,
 217         .id_table       = au0828_usb_id_table,
 218 };
 219
 220 static int __init au0828_init(void)
 221 {
 222         int ret;
 223
 224         if (au0828_debug & 1)
 225                 printk(KERN_INFO "%s() Debugging is enabled\n", __func__);
 226
 227         if (au0828_debug & 2)
 228                 printk(KERN_INFO "%s() USB Debugging is enabled\n", __func__);
 229
 230         if (au0828_debug & 4)
 231                 printk(KERN_INFO "%s() I2C Debugging is enabled\n", __func__);
 232
 233         if (au0828_debug & 8)
 234                 printk(KERN_INFO "%s() Bridge Debugging is enabled\n",
 235                        __func__);
 236
 237         printk(KERN_INFO "au0828 driver loaded\n");
 238
 239         ret = usb_register(&au0828_usb_driver);
 240         if (ret)
 241                 printk(KERN_ERR "usb_register failed, error = %d\n", ret);
 242
 243         return ret;
 244 }
 245
 246 static void __exit au0828_exit(void)
 247 {
 248         usb_deregister(&au0828_usb_driver);
 249 }
 250
 251 module_init(au0828_init);
 252 module_exit(au0828_exit);
 253
 254 MODULE_DESCRIPTION("Driver for Auvitek AU0828 based products");
 255 MODULE_AUTHOR("Steven Toth <stoth@linuxtv.org>");
 256 MODULE_LICENSE("GPL");