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 "au0828.h"
  23
  24 #include <linux/module.h>
  25 #include <linux/slab.h>
  26 #include <linux/videodev2.h>
  27 #include <media/v4l2-common.h>
  28 #include <linux/mutex.h>
  29
  30 /* Due to enum tuner_pad_index */
  31 #include <media/tuner.h>
  32
  33 /*
  34  * 1 = General debug messages
  35  * 2 = USB handling
  36  * 4 = I2C related
  37  * 8 = Bridge related
  38  * 16 = IR related
  39  */
  40 int au0828_debug;
  41 module_param_named(debug, au0828_debug, int, 0644);
  42 MODULE_PARM_DESC(debug,
  43                  "set debug bitmask: 1=general, 2=USB, 4=I2C, 8=bridge, 16=IR");
  44
  45 static unsigned int disable_usb_speed_check;
  46 module_param(disable_usb_speed_check, int, 0444);
  47 MODULE_PARM_DESC(disable_usb_speed_check,
  48                  "override min bandwidth requirement of 480M bps");
  49
  50 #define _AU0828_BULKPIPE 0x03
  51 #define _BULKPIPESIZE 0xffff
  52
  53 static int send_control_msg(struct au0828_dev *dev, u16 request, u32 value,
  54                             u16 index);
  55 static int recv_control_msg(struct au0828_dev *dev, u16 request, u32 value,
  56         u16 index, unsigned char *cp, u16 size);
  57
  58 /* USB Direction */
  59 #define CMD_REQUEST_IN          0x00
  60 #define CMD_REQUEST_OUT         0x01
  61
  62 u32 au0828_readreg(struct au0828_dev *dev, u16 reg)
  63 {
  64         u8 result = 0;
  65
  66         recv_control_msg(dev, CMD_REQUEST_IN, 0, reg, &result, 1);
  67         dprintk(8, "%s(0x%04x) = 0x%02x\n", __func__, reg, result);
  68
  69         return result;
  70 }
  71
  72 u32 au0828_writereg(struct au0828_dev *dev, u16 reg, u32 val)
  73 {
  74         dprintk(8, "%s(0x%04x, 0x%02x)\n", __func__, reg, val);
  75         return send_control_msg(dev, CMD_REQUEST_OUT, val, reg);
  76 }
  77
  78 static int send_control_msg(struct au0828_dev *dev, u16 request, u32 value,
  79         u16 index)
  80 {
  81         int status = -ENODEV;
  82
  83         if (dev->usbdev) {
  84
  85                 /* cp must be memory that has been allocated by kmalloc */
  86                 status = usb_control_msg(dev->usbdev,
  87                                 usb_sndctrlpipe(dev->usbdev, 0),
  88                                 request,
  89                                 USB_DIR_OUT | USB_TYPE_VENDOR |
  90                                         USB_RECIP_DEVICE,
  91                                 value, index, NULL, 0, 1000);
  92
  93                 status = min(status, 0);
  94
  95                 if (status < 0) {
  96                         pr_err("%s() Failed sending control message, error %d.\n",
  97                                 __func__, status);
  98                 }
  99
 100         }
 101
 102         return status;
 103 }
 104
 105 static int recv_control_msg(struct au0828_dev *dev, u16 request, u32 value,
 106         u16 index, unsigned char *cp, u16 size)
 107 {
 108         int status = -ENODEV;
 109         mutex_lock(&dev->mutex);
 110         if (dev->usbdev) {
 111                 status = usb_control_msg(dev->usbdev,
 112                                 usb_rcvctrlpipe(dev->usbdev, 0),
 113                                 request,
 114                                 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 115                                 value, index,
 116                                 dev->ctrlmsg, size, 1000);
 117
 118                 status = min(status, 0);
 119
 120                 if (status < 0) {
 121                         pr_err("%s() Failed receiving control message, error %d.\n",
 122                                 __func__, status);
 123                 }
 124
 125                 /* the host controller requires heap allocated memory, which
 126                    is why we didn't just pass "cp" into usb_control_msg */
 127                 memcpy(cp, dev->ctrlmsg, size);
 128         }
 129         mutex_unlock(&dev->mutex);
 130         return status;
 131 }
 132
 133 static void au0828_unregister_media_device(struct au0828_dev *dev)
 134 {
 135
 136 #ifdef CONFIG_MEDIA_CONTROLLER
 137         if (dev->media_dev) {
 138                 media_device_unregister(dev->media_dev);
 139                 media_device_cleanup(dev->media_dev);
 140                 kfree(dev->media_dev);
 141                 dev->media_dev = NULL;
 142         }
 143 #endif
 144 }
 145
 146 void au0828_usb_release(struct au0828_dev *dev)
 147 {
 148         au0828_unregister_media_device(dev);
 149
 150         /* I2C */
 151         au0828_i2c_unregister(dev);
 152
 153         kfree(dev);
 154 }
 155
 156 static void au0828_usb_disconnect(struct usb_interface *interface)
 157 {
 158         struct au0828_dev *dev = usb_get_intfdata(interface);
 159
 160         dprintk(1, "%s()\n", __func__);
 161
 162         /* there is a small window after disconnect, before
 163            dev->usbdev is NULL, for poll (e.g: IR) try to access
 164            the device and fill the dmesg with error messages.
 165            Set the status so poll routines can check and avoid
 166            access after disconnect.
 167         */
 168         dev->dev_state = DEV_DISCONNECTED;
 169
 170         au0828_rc_unregister(dev);
 171         /* Digital TV */
 172         au0828_dvb_unregister(dev);
 173
 174         usb_set_intfdata(interface, NULL);
 175         mutex_lock(&dev->mutex);
 176         dev->usbdev = NULL;
 177         mutex_unlock(&dev->mutex);
 178         if (au0828_analog_unregister(dev)) {
 179                 /*
 180                  * No need to call au0828_usb_release() if V4L2 is enabled,
 181                  * as this is already called via au0828_usb_v4l2_release()
 182                  */
 183                 return;
 184         }
 185         au0828_usb_release(dev);
 186 }
 187
 188 static int au0828_media_device_init(struct au0828_dev *dev,
 189                                     struct usb_device *udev)
 190 {
 191 #ifdef CONFIG_MEDIA_CONTROLLER
 192         struct media_device *mdev;
 193
 194         mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
 195         if (!mdev)
 196                 return -ENOMEM;
 197
 198         if (!dev->board.name)
 199                 media_device_usb_init(mdev, udev, "unknown au0828");
 200         else
 201                 media_device_usb_init(mdev, udev, dev->board.name);
 202
 203         dev->media_dev = mdev;
 204 #endif
 205         return 0;
 206 }
 207
 208
 209 static int au0828_usb_probe(struct usb_interface *interface,
 210         const struct usb_device_id *id)
 211 {
 212         int ifnum;
 213         int retval = 0;
 214
 215         struct au0828_dev *dev;
 216         struct usb_device *usbdev = interface_to_usbdev(interface);
 217
 218         ifnum = interface->altsetting->desc.bInterfaceNumber;
 219
 220         if (ifnum != 0)
 221                 return -ENODEV;
 222
 223         dprintk(1, "%s() vendor id 0x%x device id 0x%x ifnum:%d\n", __func__,
 224                 le16_to_cpu(usbdev->descriptor.idVendor),
 225                 le16_to_cpu(usbdev->descriptor.idProduct),
 226                 ifnum);
 227
 228         /*
 229          * Make sure we have 480 Mbps of bandwidth, otherwise things like
 230          * video stream wouldn't likely work, since 12 Mbps is generally
 231          * not enough even for most Digital TV streams.
 232          */
 233         if (usbdev->speed != USB_SPEED_HIGH && disable_usb_speed_check == 0) {
 234                 pr_err("au0828: Device initialization failed.\n");
 235                 pr_err("au0828: Device must be connected to a high-speed USB 2.0 port.\n");
 236                 return -ENODEV;
 237         }
 238
 239         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 240         if (dev == NULL) {
 241                 pr_err("%s() Unable to allocate memory\n", __func__);
 242                 return -ENOMEM;
 243         }
 244
 245         mutex_init(&dev->lock);
 246         mutex_lock(&dev->lock);
 247         mutex_init(&dev->mutex);
 248         mutex_init(&dev->dvb.lock);
 249         dev->usbdev = usbdev;
 250         dev->boardnr = id->driver_info;
 251         dev->board = au0828_boards[dev->boardnr];
 252
 253         /* Initialize the media controller */
 254         retval = au0828_media_device_init(dev, usbdev);
 255         if (retval) {
 256                 pr_err("%s() au0828_media_device_init failed\n",
 257                        __func__);
 258                 mutex_unlock(&dev->lock);
 259                 kfree(dev);
 260                 return retval;
 261         }
 262
 263         retval = au0828_v4l2_device_register(interface, dev);
 264         if (retval) {
 265                 au0828_usb_v4l2_media_release(dev);
 266                 mutex_unlock(&dev->lock);
 267                 kfree(dev);
 268                 return retval;
 269         }
 270
 271         /* Power Up the bridge */
 272         au0828_write(dev, REG_600, 1 << 4);
 273
 274         /* Bring up the GPIO's and supporting devices */
 275         au0828_gpio_setup(dev);
 276
 277         /* I2C */
 278         au0828_i2c_register(dev);
 279
 280         /* Setup */
 281         au0828_card_setup(dev);
 282
 283         /* Analog TV */
 284         retval = au0828_analog_register(dev, interface);
 285         if (retval) {
 286                 pr_err("%s() au0282_dev_register failed to register on V4L2\n",
 287                         __func__);
 288                 goto done;
 289         }
 290
 291         /* Digital TV */
 292         retval = au0828_dvb_register(dev);
 293         if (retval)
 294                 pr_err("%s() au0282_dev_register failed\n",
 295                        __func__);
 296
 297         /* Remote controller */
 298         au0828_rc_register(dev);
 299
 300         /*
 301          * Store the pointer to the au0828_dev so it can be accessed in
 302          * au0828_usb_disconnect
 303          */
 304         usb_set_intfdata(interface, dev);
 305
 306         pr_info("Registered device AU0828 [%s]\n",
 307                 dev->board.name == NULL ? "Unset" : dev->board.name);
 308
 309         mutex_unlock(&dev->lock);
 310
 311 #ifdef CONFIG_MEDIA_CONTROLLER
 312         retval = media_device_register(dev->media_dev);
 313 #endif
 314
 315 done:
 316         if (retval < 0)
 317                 au0828_usb_disconnect(interface);
 318
 319         return retval;
 320 }
 321
 322 static int au0828_suspend(struct usb_interface *interface,
 323                                 pm_message_t message)
 324 {
 325         struct au0828_dev *dev = usb_get_intfdata(interface);
 326
 327         if (!dev)
 328                 return 0;
 329
 330         pr_info("Suspend\n");
 331
 332         au0828_rc_suspend(dev);
 333         au0828_v4l2_suspend(dev);
 334         au0828_dvb_suspend(dev);
 335
 336         /* FIXME: should suspend also ATV/DTV */
 337
 338         return 0;
 339 }
 340
 341 static int au0828_resume(struct usb_interface *interface)
 342 {
 343         struct au0828_dev *dev = usb_get_intfdata(interface);
 344         if (!dev)
 345                 return 0;
 346
 347         pr_info("Resume\n");
 348
 349         /* Power Up the bridge */
 350         au0828_write(dev, REG_600, 1 << 4);
 351
 352         /* Bring up the GPIO's and supporting devices */
 353         au0828_gpio_setup(dev);
 354
 355         au0828_rc_resume(dev);
 356         au0828_v4l2_resume(dev);
 357         au0828_dvb_resume(dev);
 358
 359         /* FIXME: should resume also ATV/DTV */
 360
 361         return 0;
 362 }
 363
 364 static struct usb_driver au0828_usb_driver = {
 365         .name           = KBUILD_MODNAME,
 366         .probe          = au0828_usb_probe,
 367         .disconnect     = au0828_usb_disconnect,
 368         .id_table       = au0828_usb_id_table,
 369         .suspend        = au0828_suspend,
 370         .resume         = au0828_resume,
 371         .reset_resume   = au0828_resume,
 372 };
 373
 374 static int __init au0828_init(void)
 375 {
 376         int ret;
 377
 378         if (au0828_debug & 1)
 379                 pr_info("%s() Debugging is enabled\n", __func__);
 380
 381         if (au0828_debug & 2)
 382                 pr_info("%s() USB Debugging is enabled\n", __func__);
 383
 384         if (au0828_debug & 4)
 385                 pr_info("%s() I2C Debugging is enabled\n", __func__);
 386
 387         if (au0828_debug & 8)
 388                 pr_info("%s() Bridge Debugging is enabled\n",
 389                        __func__);
 390
 391         if (au0828_debug & 16)
 392                 pr_info("%s() IR Debugging is enabled\n",
 393                        __func__);
 394
 395         pr_info("au0828 driver loaded\n");
 396
 397         ret = usb_register(&au0828_usb_driver);
 398         if (ret)
 399                 pr_err("usb_register failed, error = %d\n", ret);
 400
 401         return ret;
 402 }
 403
 404 static void __exit au0828_exit(void)
 405 {
 406         usb_deregister(&au0828_usb_driver);
 407 }
 408
 409 module_init(au0828_init);
 410 module_exit(au0828_exit);
 411
 412 MODULE_DESCRIPTION("Driver for Auvitek AU0828 based products");
 413 MODULE_AUTHOR("Steven Toth <stoth@linuxtv.org>");
 414 MODULE_LICENSE("GPL");
 415 MODULE_VERSION("0.0.3");