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 /* 31 * 1 = General debug messages 32 * 2 = USB handling 33 * 4 = I2C related 34 * 8 = Bridge related 35 * 16 = IR related 36 */ 37 int au0828_debug; 38 module_param_named(debug, au0828_debug, int, 0644); 39 MODULE_PARM_DESC(debug, 40 "set debug bitmask: 1=general, 2=USB, 4=I2C, 8=bridge, 16=IR"); 41 42 static unsigned int disable_usb_speed_check; 43 module_param(disable_usb_speed_check, int, 0444); 44 MODULE_PARM_DESC(disable_usb_speed_check, 45 "override min bandwidth requirement of 480M bps"); 46 47 #define _AU0828_BULKPIPE 0x03 48 #define _BULKPIPESIZE 0xffff 49 50 static int send_control_msg(struct au0828_dev *dev, u16 request, u32 value, 51 u16 index); 52 static int recv_control_msg(struct au0828_dev *dev, u16 request, u32 value, 53 u16 index, unsigned char *cp, u16 size); 54 55 /* USB Direction */ 56 #define CMD_REQUEST_IN 0x00 57 #define CMD_REQUEST_OUT 0x01 58 59 u32 au0828_readreg(struct au0828_dev *dev, u16 reg) 60 { 61 u8 result = 0; 62 63 recv_control_msg(dev, CMD_REQUEST_IN, 0, reg, &result, 1); 64 dprintk(8, "%s(0x%04x) = 0x%02x\n", __func__, reg, result); 65 66 return result; 67 } 68 69 u32 au0828_writereg(struct au0828_dev *dev, u16 reg, u32 val) 70 { 71 dprintk(8, "%s(0x%04x, 0x%02x)\n", __func__, reg, val); 72 return send_control_msg(dev, CMD_REQUEST_OUT, val, reg); 73 } 74 75 static int send_control_msg(struct au0828_dev *dev, u16 request, u32 value, 76 u16 index) 77 { 78 int status = -ENODEV; 79 80 if (dev->usbdev) { 81 82 /* cp must be memory that has been allocated by kmalloc */ 83 status = usb_control_msg(dev->usbdev, 84 usb_sndctrlpipe(dev->usbdev, 0), 85 request, 86 USB_DIR_OUT | USB_TYPE_VENDOR | 87 USB_RECIP_DEVICE, 88 value, index, NULL, 0, 1000); 89 90 status = min(status, 0); 91 92 if (status < 0) { 93 pr_err("%s() Failed sending control message, error %d.\n", 94 __func__, status); 95 } 96 97 } 98 99 return status; 100 } 101 102 static int recv_control_msg(struct au0828_dev *dev, u16 request, u32 value, 103 u16 index, unsigned char *cp, u16 size) 104 { 105 int status = -ENODEV; 106 mutex_lock(&dev->mutex); 107 if (dev->usbdev) { 108 status = usb_control_msg(dev->usbdev, 109 usb_rcvctrlpipe(dev->usbdev, 0), 110 request, 111 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE, 112 value, index, 113 dev->ctrlmsg, size, 1000); 114 115 status = min(status, 0); 116 117 if (status < 0) { 118 pr_err("%s() Failed receiving control message, error %d.\n", 119 __func__, status); 120 } 121 122 /* the host controller requires heap allocated memory, which 123 is why we didn't just pass "cp" into usb_control_msg */ 124 memcpy(cp, dev->ctrlmsg, size); 125 } 126 mutex_unlock(&dev->mutex); 127 return status; 128 } 129 130 static void au0828_usb_release(struct au0828_dev *dev) 131 { 132 /* I2C */ 133 au0828_i2c_unregister(dev); 134 135 kfree(dev); 136 } 137 138 #ifdef CONFIG_VIDEO_AU0828_V4L2 139 static void au0828_usb_v4l2_release(struct v4l2_device *v4l2_dev) 140 { 141 struct au0828_dev *dev = 142 container_of(v4l2_dev, struct au0828_dev, v4l2_dev); 143 144 v4l2_ctrl_handler_free(&dev->v4l2_ctrl_hdl); 145 v4l2_device_unregister(&dev->v4l2_dev); 146 au0828_usb_release(dev); 147 } 148 #endif 149 150 static void au0828_usb_disconnect(struct usb_interface *interface) 151 { 152 struct au0828_dev *dev = usb_get_intfdata(interface); 153 154 dprintk(1, "%s()\n", __func__); 155 156 /* there is a small window after disconnect, before 157 dev->usbdev is NULL, for poll (e.g: IR) try to access 158 the device and fill the dmesg with error messages. 159 Set the status so poll routines can check and avoid 160 access after disconnect. 161 */ 162 dev->dev_state = DEV_DISCONNECTED; 163 164 au0828_rc_unregister(dev); 165 /* Digital TV */ 166 au0828_dvb_unregister(dev); 167 168 usb_set_intfdata(interface, NULL); 169 mutex_lock(&dev->mutex); 170 dev->usbdev = NULL; 171 mutex_unlock(&dev->mutex); 172 #ifdef CONFIG_VIDEO_AU0828_V4L2 173 if (AUVI_INPUT(0).type != AU0828_VMUX_UNDEFINED) { 174 au0828_analog_unregister(dev); 175 v4l2_device_disconnect(&dev->v4l2_dev); 176 v4l2_device_put(&dev->v4l2_dev); 177 return; 178 } 179 #endif 180 au0828_usb_release(dev); 181 } 182 183 static int au0828_usb_probe(struct usb_interface *interface, 184 const struct usb_device_id *id) 185 { 186 int ifnum; 187 int retval = 0; 188 189 struct au0828_dev *dev; 190 struct usb_device *usbdev = interface_to_usbdev(interface); 191 192 ifnum = interface->altsetting->desc.bInterfaceNumber; 193 194 if (ifnum != 0) 195 return -ENODEV; 196 197 dprintk(1, "%s() vendor id 0x%x device id 0x%x ifnum:%d\n", __func__, 198 le16_to_cpu(usbdev->descriptor.idVendor), 199 le16_to_cpu(usbdev->descriptor.idProduct), 200 ifnum); 201 202 /* 203 * Make sure we have 480 Mbps of bandwidth, otherwise things like 204 * video stream wouldn't likely work, since 12 Mbps is generally 205 * not enough even for most Digital TV streams. 206 */ 207 if (usbdev->speed != USB_SPEED_HIGH && disable_usb_speed_check == 0) { 208 pr_err("au0828: Device initialization failed.\n"); 209 pr_err("au0828: Device must be connected to a high-speed USB 2.0 port.\n"); 210 return -ENODEV; 211 } 212 213 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 214 if (dev == NULL) { 215 pr_err("%s() Unable to allocate memory\n", __func__); 216 return -ENOMEM; 217 } 218 219 mutex_init(&dev->lock); 220 mutex_lock(&dev->lock); 221 mutex_init(&dev->mutex); 222 mutex_init(&dev->dvb.lock); 223 dev->usbdev = usbdev; 224 dev->boardnr = id->driver_info; 225 dev->board = au0828_boards[dev->boardnr]; 226 227 228 #ifdef CONFIG_VIDEO_AU0828_V4L2 229 dev->v4l2_dev.release = au0828_usb_v4l2_release; 230 231 /* Create the v4l2_device */ 232 retval = v4l2_device_register(&interface->dev, &dev->v4l2_dev); 233 if (retval) { 234 pr_err("%s() v4l2_device_register failed\n", 235 __func__); 236 mutex_unlock(&dev->lock); 237 kfree(dev); 238 return retval; 239 } 240 /* This control handler will inherit the controls from au8522 */ 241 retval = v4l2_ctrl_handler_init(&dev->v4l2_ctrl_hdl, 4); 242 if (retval) { 243 pr_err("%s() v4l2_ctrl_handler_init failed\n", 244 __func__); 245 mutex_unlock(&dev->lock); 246 kfree(dev); 247 return retval; 248 } 249 dev->v4l2_dev.ctrl_handler = &dev->v4l2_ctrl_hdl; 250 #endif 251 252 /* Power Up the bridge */ 253 au0828_write(dev, REG_600, 1 << 4); 254 255 /* Bring up the GPIO's and supporting devices */ 256 au0828_gpio_setup(dev); 257 258 /* I2C */ 259 au0828_i2c_register(dev); 260 261 /* Setup */ 262 au0828_card_setup(dev); 263 264 #ifdef CONFIG_VIDEO_AU0828_V4L2 265 /* Analog TV */ 266 if (AUVI_INPUT(0).type != AU0828_VMUX_UNDEFINED) 267 au0828_analog_register(dev, interface); 268 #endif 269 270 /* Digital TV */ 271 retval = au0828_dvb_register(dev); 272 if (retval) 273 pr_err("%s() au0282_dev_register failed\n", 274 __func__); 275 276 /* Remote controller */ 277 au0828_rc_register(dev); 278 279 /* 280 * Store the pointer to the au0828_dev so it can be accessed in 281 * au0828_usb_disconnect 282 */ 283 usb_set_intfdata(interface, dev); 284 285 pr_info("Registered device AU0828 [%s]\n", 286 dev->board.name == NULL ? "Unset" : dev->board.name); 287 288 mutex_unlock(&dev->lock); 289 290 return retval; 291 } 292 293 static int au0828_suspend(struct usb_interface *interface, 294 pm_message_t message) 295 { 296 struct au0828_dev *dev = usb_get_intfdata(interface); 297 298 if (!dev) 299 return 0; 300 301 pr_info("Suspend\n"); 302 303 au0828_rc_suspend(dev); 304 au0828_v4l2_suspend(dev); 305 au0828_dvb_suspend(dev); 306 307 /* FIXME: should suspend also ATV/DTV */ 308 309 return 0; 310 } 311 312 static int au0828_resume(struct usb_interface *interface) 313 { 314 struct au0828_dev *dev = usb_get_intfdata(interface); 315 if (!dev) 316 return 0; 317 318 pr_info("Resume\n"); 319 320 /* Power Up the bridge */ 321 au0828_write(dev, REG_600, 1 << 4); 322 323 /* Bring up the GPIO's and supporting devices */ 324 au0828_gpio_setup(dev); 325 326 au0828_rc_resume(dev); 327 au0828_v4l2_resume(dev); 328 au0828_dvb_resume(dev); 329 330 /* FIXME: should resume also ATV/DTV */ 331 332 return 0; 333 } 334 335 static struct usb_driver au0828_usb_driver = { 336 .name = KBUILD_MODNAME, 337 .probe = au0828_usb_probe, 338 .disconnect = au0828_usb_disconnect, 339 .id_table = au0828_usb_id_table, 340 .suspend = au0828_suspend, 341 .resume = au0828_resume, 342 .reset_resume = au0828_resume, 343 }; 344 345 static int __init au0828_init(void) 346 { 347 int ret; 348 349 if (au0828_debug & 1) 350 pr_info("%s() Debugging is enabled\n", __func__); 351 352 if (au0828_debug & 2) 353 pr_info("%s() USB Debugging is enabled\n", __func__); 354 355 if (au0828_debug & 4) 356 pr_info("%s() I2C Debugging is enabled\n", __func__); 357 358 if (au0828_debug & 8) 359 pr_info("%s() Bridge Debugging is enabled\n", 360 __func__); 361 362 if (au0828_debug & 16) 363 pr_info("%s() IR Debugging is enabled\n", 364 __func__); 365 366 pr_info("au0828 driver loaded\n"); 367 368 ret = usb_register(&au0828_usb_driver); 369 if (ret) 370 pr_err("usb_register failed, error = %d\n", ret); 371 372 return ret; 373 } 374 375 static void __exit au0828_exit(void) 376 { 377 usb_deregister(&au0828_usb_driver); 378 } 379 380 module_init(au0828_init); 381 module_exit(au0828_exit); 382 383 MODULE_DESCRIPTION("Driver for Auvitek AU0828 based products"); 384 MODULE_AUTHOR("Steven Toth <stoth@linuxtv.org>"); 385 MODULE_LICENSE("GPL"); 386 MODULE_VERSION("0.0.3"); 387