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_devnode_is_registered(&dev->media_dev->devnode)) { 139 media_device_unregister(dev->media_dev); 140 media_device_cleanup(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 = media_device_get_devres(&udev->dev); 195 if (!mdev) 196 return -ENOMEM; 197 198 media_device_usb_init(mdev, udev, udev->product); 199 200 dev->media_dev = mdev; 201 #endif 202 return 0; 203 } 204 205 206 static int au0828_usb_probe(struct usb_interface *interface, 207 const struct usb_device_id *id) 208 { 209 int ifnum; 210 int retval = 0; 211 212 struct au0828_dev *dev; 213 struct usb_device *usbdev = interface_to_usbdev(interface); 214 215 ifnum = interface->altsetting->desc.bInterfaceNumber; 216 217 if (ifnum != 0) 218 return -ENODEV; 219 220 dprintk(1, "%s() vendor id 0x%x device id 0x%x ifnum:%d\n", __func__, 221 le16_to_cpu(usbdev->descriptor.idVendor), 222 le16_to_cpu(usbdev->descriptor.idProduct), 223 ifnum); 224 225 /* 226 * Make sure we have 480 Mbps of bandwidth, otherwise things like 227 * video stream wouldn't likely work, since 12 Mbps is generally 228 * not enough even for most Digital TV streams. 229 */ 230 if (usbdev->speed != USB_SPEED_HIGH && disable_usb_speed_check == 0) { 231 pr_err("au0828: Device initialization failed.\n"); 232 pr_err("au0828: Device must be connected to a high-speed USB 2.0 port.\n"); 233 return -ENODEV; 234 } 235 236 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 237 if (dev == NULL) { 238 pr_err("%s() Unable to allocate memory\n", __func__); 239 return -ENOMEM; 240 } 241 242 mutex_init(&dev->lock); 243 mutex_lock(&dev->lock); 244 mutex_init(&dev->mutex); 245 mutex_init(&dev->dvb.lock); 246 dev->usbdev = usbdev; 247 dev->boardnr = id->driver_info; 248 dev->board = au0828_boards[dev->boardnr]; 249 250 /* Initialize the media controller */ 251 retval = au0828_media_device_init(dev, usbdev); 252 if (retval) { 253 pr_err("%s() au0828_media_device_init failed\n", 254 __func__); 255 mutex_unlock(&dev->lock); 256 kfree(dev); 257 return retval; 258 } 259 260 retval = au0828_v4l2_device_register(interface, dev); 261 if (retval) { 262 au0828_usb_v4l2_media_release(dev); 263 mutex_unlock(&dev->lock); 264 kfree(dev); 265 return retval; 266 } 267 268 /* Power Up the bridge */ 269 au0828_write(dev, REG_600, 1 << 4); 270 271 /* Bring up the GPIO's and supporting devices */ 272 au0828_gpio_setup(dev); 273 274 /* I2C */ 275 au0828_i2c_register(dev); 276 277 /* Setup */ 278 au0828_card_setup(dev); 279 280 /* Analog TV */ 281 retval = au0828_analog_register(dev, interface); 282 if (retval) { 283 pr_err("%s() au0282_dev_register failed to register on V4L2\n", 284 __func__); 285 goto done; 286 } 287 288 /* Digital TV */ 289 retval = au0828_dvb_register(dev); 290 if (retval) 291 pr_err("%s() au0282_dev_register failed\n", 292 __func__); 293 294 /* Remote controller */ 295 au0828_rc_register(dev); 296 297 /* 298 * Store the pointer to the au0828_dev so it can be accessed in 299 * au0828_usb_disconnect 300 */ 301 usb_set_intfdata(interface, dev); 302 303 pr_info("Registered device AU0828 [%s]\n", 304 dev->board.name == NULL ? "Unset" : dev->board.name); 305 306 mutex_unlock(&dev->lock); 307 308 #ifdef CONFIG_MEDIA_CONTROLLER 309 retval = media_device_register(dev->media_dev); 310 #endif 311 312 done: 313 if (retval < 0) 314 au0828_usb_disconnect(interface); 315 316 return retval; 317 } 318 319 static int au0828_suspend(struct usb_interface *interface, 320 pm_message_t message) 321 { 322 struct au0828_dev *dev = usb_get_intfdata(interface); 323 324 if (!dev) 325 return 0; 326 327 pr_info("Suspend\n"); 328 329 au0828_rc_suspend(dev); 330 au0828_v4l2_suspend(dev); 331 au0828_dvb_suspend(dev); 332 333 /* FIXME: should suspend also ATV/DTV */ 334 335 return 0; 336 } 337 338 static int au0828_resume(struct usb_interface *interface) 339 { 340 struct au0828_dev *dev = usb_get_intfdata(interface); 341 if (!dev) 342 return 0; 343 344 pr_info("Resume\n"); 345 346 /* Power Up the bridge */ 347 au0828_write(dev, REG_600, 1 << 4); 348 349 /* Bring up the GPIO's and supporting devices */ 350 au0828_gpio_setup(dev); 351 352 au0828_rc_resume(dev); 353 au0828_v4l2_resume(dev); 354 au0828_dvb_resume(dev); 355 356 /* FIXME: should resume also ATV/DTV */ 357 358 return 0; 359 } 360 361 static struct usb_driver au0828_usb_driver = { 362 .name = KBUILD_MODNAME, 363 .probe = au0828_usb_probe, 364 .disconnect = au0828_usb_disconnect, 365 .id_table = au0828_usb_id_table, 366 .suspend = au0828_suspend, 367 .resume = au0828_resume, 368 .reset_resume = au0828_resume, 369 }; 370 371 static int __init au0828_init(void) 372 { 373 int ret; 374 375 if (au0828_debug & 1) 376 pr_info("%s() Debugging is enabled\n", __func__); 377 378 if (au0828_debug & 2) 379 pr_info("%s() USB Debugging is enabled\n", __func__); 380 381 if (au0828_debug & 4) 382 pr_info("%s() I2C Debugging is enabled\n", __func__); 383 384 if (au0828_debug & 8) 385 pr_info("%s() Bridge Debugging is enabled\n", 386 __func__); 387 388 if (au0828_debug & 16) 389 pr_info("%s() IR Debugging is enabled\n", 390 __func__); 391 392 pr_info("au0828 driver loaded\n"); 393 394 ret = usb_register(&au0828_usb_driver); 395 if (ret) 396 pr_err("usb_register failed, error = %d\n", ret); 397 398 return ret; 399 } 400 401 static void __exit au0828_exit(void) 402 { 403 usb_deregister(&au0828_usb_driver); 404 } 405 406 module_init(au0828_init); 407 module_exit(au0828_exit); 408 409 MODULE_DESCRIPTION("Driver for Auvitek AU0828 based products"); 410 MODULE_AUTHOR("Steven Toth <stoth@linuxtv.org>"); 411 MODULE_LICENSE("GPL"); 412 MODULE_VERSION("0.0.3"); 413