1 /* 2 * USB IR Dongle driver 3 * 4 * Copyright (C) 2001-2002 Greg Kroah-Hartman (greg@kroah.com) 5 * Copyright (C) 2002 Gary Brubaker (xavyer@ix.netcom.com) 6 * Copyright (C) 2010 Johan Hovold (jhovold@gmail.com) 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This driver allows a USB IrDA device to be used as a "dumb" serial device. 14 * This can be useful if you do not have access to a full IrDA stack on the 15 * other side of the connection. If you do have an IrDA stack on both devices, 16 * please use the usb-irda driver, as it contains the proper error checking and 17 * other goodness of a full IrDA stack. 18 * 19 * Portions of this driver were taken from drivers/net/irda/irda-usb.c, which 20 * was written by Roman Weissgaerber <weissg@vienna.at>, Dag Brattli 21 * <dag@brattli.net>, and Jean Tourrilhes <jt@hpl.hp.com> 22 * 23 * See Documentation/usb/usb-serial.txt for more information on using this 24 * driver 25 */ 26 27 #include <linux/kernel.h> 28 #include <linux/errno.h> 29 #include <linux/init.h> 30 #include <linux/slab.h> 31 #include <linux/tty.h> 32 #include <linux/tty_driver.h> 33 #include <linux/tty_flip.h> 34 #include <linux/module.h> 35 #include <linux/spinlock.h> 36 #include <linux/uaccess.h> 37 #include <linux/usb.h> 38 #include <linux/usb/serial.h> 39 #include <linux/usb/irda.h> 40 41 #define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>, Johan Hovold <jhovold@gmail.com>" 42 #define DRIVER_DESC "USB IR Dongle driver" 43 44 /* if overridden by the user, then use their value for the size of the read and 45 * write urbs */ 46 static int buffer_size; 47 48 /* if overridden by the user, then use the specified number of XBOFs */ 49 static int xbof = -1; 50 51 static int ir_startup (struct usb_serial *serial); 52 static int ir_open(struct tty_struct *tty, struct usb_serial_port *port); 53 static int ir_prepare_write_buffer(struct usb_serial_port *port, 54 void *dest, size_t size); 55 static void ir_process_read_urb(struct urb *urb); 56 static void ir_set_termios(struct tty_struct *tty, 57 struct usb_serial_port *port, struct ktermios *old_termios); 58 59 /* Not that this lot means you can only have one per system */ 60 static u8 ir_baud; 61 static u8 ir_xbof; 62 static u8 ir_add_bof; 63 64 static const struct usb_device_id ir_id_table[] = { 65 { USB_DEVICE(0x050f, 0x0180) }, /* KC Technology, KC-180 */ 66 { USB_DEVICE(0x08e9, 0x0100) }, /* XTNDAccess */ 67 { USB_DEVICE(0x09c4, 0x0011) }, /* ACTiSys ACT-IR2000U */ 68 { USB_INTERFACE_INFO(USB_CLASS_APP_SPEC, USB_SUBCLASS_IRDA, 0) }, 69 { } /* Terminating entry */ 70 }; 71 72 MODULE_DEVICE_TABLE(usb, ir_id_table); 73 74 static struct usb_serial_driver ir_device = { 75 .driver = { 76 .owner = THIS_MODULE, 77 .name = "ir-usb", 78 }, 79 .description = "IR Dongle", 80 .id_table = ir_id_table, 81 .num_ports = 1, 82 .set_termios = ir_set_termios, 83 .attach = ir_startup, 84 .open = ir_open, 85 .prepare_write_buffer = ir_prepare_write_buffer, 86 .process_read_urb = ir_process_read_urb, 87 }; 88 89 static struct usb_serial_driver * const serial_drivers[] = { 90 &ir_device, NULL 91 }; 92 93 static inline void irda_usb_dump_class_desc(struct usb_serial *serial, 94 struct usb_irda_cs_descriptor *desc) 95 { 96 struct device *dev = &serial->dev->dev; 97 98 dev_dbg(dev, "bLength=%x\n", desc->bLength); 99 dev_dbg(dev, "bDescriptorType=%x\n", desc->bDescriptorType); 100 dev_dbg(dev, "bcdSpecRevision=%x\n", __le16_to_cpu(desc->bcdSpecRevision)); 101 dev_dbg(dev, "bmDataSize=%x\n", desc->bmDataSize); 102 dev_dbg(dev, "bmWindowSize=%x\n", desc->bmWindowSize); 103 dev_dbg(dev, "bmMinTurnaroundTime=%d\n", desc->bmMinTurnaroundTime); 104 dev_dbg(dev, "wBaudRate=%x\n", __le16_to_cpu(desc->wBaudRate)); 105 dev_dbg(dev, "bmAdditionalBOFs=%x\n", desc->bmAdditionalBOFs); 106 dev_dbg(dev, "bIrdaRateSniff=%x\n", desc->bIrdaRateSniff); 107 dev_dbg(dev, "bMaxUnicastList=%x\n", desc->bMaxUnicastList); 108 } 109 110 /*------------------------------------------------------------------*/ 111 /* 112 * Function irda_usb_find_class_desc(dev, ifnum) 113 * 114 * Returns instance of IrDA class descriptor, or NULL if not found 115 * 116 * The class descriptor is some extra info that IrDA USB devices will 117 * offer to us, describing their IrDA characteristics. We will use that in 118 * irda_usb_init_qos() 119 * 120 * Based on the same function in drivers/net/irda/irda-usb.c 121 */ 122 static struct usb_irda_cs_descriptor * 123 irda_usb_find_class_desc(struct usb_serial *serial, unsigned int ifnum) 124 { 125 struct usb_device *dev = serial->dev; 126 struct usb_irda_cs_descriptor *desc; 127 int ret; 128 129 desc = kzalloc(sizeof(*desc), GFP_KERNEL); 130 if (!desc) 131 return NULL; 132 133 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 134 USB_REQ_CS_IRDA_GET_CLASS_DESC, 135 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, 136 0, ifnum, desc, sizeof(*desc), 1000); 137 138 dev_dbg(&serial->dev->dev, "%s - ret=%d\n", __func__, ret); 139 if (ret < sizeof(*desc)) { 140 dev_dbg(&serial->dev->dev, 141 "%s - class descriptor read %s (%d)\n", __func__, 142 (ret < 0) ? "failed" : "too short", ret); 143 goto error; 144 } 145 if (desc->bDescriptorType != USB_DT_CS_IRDA) { 146 dev_dbg(&serial->dev->dev, "%s - bad class descriptor type\n", 147 __func__); 148 goto error; 149 } 150 151 irda_usb_dump_class_desc(serial, desc); 152 return desc; 153 154 error: 155 kfree(desc); 156 return NULL; 157 } 158 159 static u8 ir_xbof_change(u8 xbof) 160 { 161 u8 result; 162 163 /* reference irda-usb.c */ 164 switch (xbof) { 165 case 48: 166 result = 0x10; 167 break; 168 case 28: 169 case 24: 170 result = 0x20; 171 break; 172 default: 173 case 12: 174 result = 0x30; 175 break; 176 case 5: 177 case 6: 178 result = 0x40; 179 break; 180 case 3: 181 result = 0x50; 182 break; 183 case 2: 184 result = 0x60; 185 break; 186 case 1: 187 result = 0x70; 188 break; 189 case 0: 190 result = 0x80; 191 break; 192 } 193 194 return(result); 195 } 196 197 static int ir_startup(struct usb_serial *serial) 198 { 199 struct usb_irda_cs_descriptor *irda_desc; 200 201 irda_desc = irda_usb_find_class_desc(serial, 0); 202 if (!irda_desc) { 203 dev_err(&serial->dev->dev, 204 "IRDA class descriptor not found, device not bound\n"); 205 return -ENODEV; 206 } 207 208 dev_dbg(&serial->dev->dev, 209 "%s - Baud rates supported:%s%s%s%s%s%s%s%s%s\n", 210 __func__, 211 (irda_desc->wBaudRate & USB_IRDA_BR_2400) ? " 2400" : "", 212 (irda_desc->wBaudRate & USB_IRDA_BR_9600) ? " 9600" : "", 213 (irda_desc->wBaudRate & USB_IRDA_BR_19200) ? " 19200" : "", 214 (irda_desc->wBaudRate & USB_IRDA_BR_38400) ? " 38400" : "", 215 (irda_desc->wBaudRate & USB_IRDA_BR_57600) ? " 57600" : "", 216 (irda_desc->wBaudRate & USB_IRDA_BR_115200) ? " 115200" : "", 217 (irda_desc->wBaudRate & USB_IRDA_BR_576000) ? " 576000" : "", 218 (irda_desc->wBaudRate & USB_IRDA_BR_1152000) ? " 1152000" : "", 219 (irda_desc->wBaudRate & USB_IRDA_BR_4000000) ? " 4000000" : ""); 220 221 switch (irda_desc->bmAdditionalBOFs) { 222 case USB_IRDA_AB_48: 223 ir_add_bof = 48; 224 break; 225 case USB_IRDA_AB_24: 226 ir_add_bof = 24; 227 break; 228 case USB_IRDA_AB_12: 229 ir_add_bof = 12; 230 break; 231 case USB_IRDA_AB_6: 232 ir_add_bof = 6; 233 break; 234 case USB_IRDA_AB_3: 235 ir_add_bof = 3; 236 break; 237 case USB_IRDA_AB_2: 238 ir_add_bof = 2; 239 break; 240 case USB_IRDA_AB_1: 241 ir_add_bof = 1; 242 break; 243 case USB_IRDA_AB_0: 244 ir_add_bof = 0; 245 break; 246 default: 247 break; 248 } 249 250 kfree(irda_desc); 251 252 return 0; 253 } 254 255 static int ir_open(struct tty_struct *tty, struct usb_serial_port *port) 256 { 257 int i; 258 259 for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i) 260 port->write_urbs[i]->transfer_flags = URB_ZERO_PACKET; 261 262 /* Start reading from the device */ 263 return usb_serial_generic_open(tty, port); 264 } 265 266 static int ir_prepare_write_buffer(struct usb_serial_port *port, 267 void *dest, size_t size) 268 { 269 unsigned char *buf = dest; 270 int count; 271 272 /* 273 * The first byte of the packet we send to the device contains an 274 * inbound header which indicates an additional number of BOFs and 275 * a baud rate change. 276 * 277 * See section 5.4.2.2 of the USB IrDA spec. 278 */ 279 *buf = ir_xbof | ir_baud; 280 281 count = kfifo_out_locked(&port->write_fifo, buf + 1, size - 1, 282 &port->lock); 283 return count + 1; 284 } 285 286 static void ir_process_read_urb(struct urb *urb) 287 { 288 struct usb_serial_port *port = urb->context; 289 unsigned char *data = urb->transfer_buffer; 290 291 if (!urb->actual_length) 292 return; 293 /* 294 * The first byte of the packet we get from the device 295 * contains a busy indicator and baud rate change. 296 * See section 5.4.1.2 of the USB IrDA spec. 297 */ 298 if (*data & 0x0f) 299 ir_baud = *data & 0x0f; 300 301 if (urb->actual_length == 1) 302 return; 303 304 tty_insert_flip_string(&port->port, data + 1, urb->actual_length - 1); 305 tty_flip_buffer_push(&port->port); 306 } 307 308 static void ir_set_termios_callback(struct urb *urb) 309 { 310 kfree(urb->transfer_buffer); 311 312 if (urb->status) 313 dev_dbg(&urb->dev->dev, "%s - non-zero urb status: %d\n", 314 __func__, urb->status); 315 } 316 317 static void ir_set_termios(struct tty_struct *tty, 318 struct usb_serial_port *port, struct ktermios *old_termios) 319 { 320 struct urb *urb; 321 unsigned char *transfer_buffer; 322 int result; 323 speed_t baud; 324 int ir_baud; 325 326 baud = tty_get_baud_rate(tty); 327 328 /* 329 * FIXME, we should compare the baud request against the 330 * capability stated in the IR header that we got in the 331 * startup function. 332 */ 333 334 switch (baud) { 335 case 2400: 336 ir_baud = USB_IRDA_BR_2400; 337 break; 338 case 9600: 339 ir_baud = USB_IRDA_BR_9600; 340 break; 341 case 19200: 342 ir_baud = USB_IRDA_BR_19200; 343 break; 344 case 38400: 345 ir_baud = USB_IRDA_BR_38400; 346 break; 347 case 57600: 348 ir_baud = USB_IRDA_BR_57600; 349 break; 350 case 115200: 351 ir_baud = USB_IRDA_BR_115200; 352 break; 353 case 576000: 354 ir_baud = USB_IRDA_BR_576000; 355 break; 356 case 1152000: 357 ir_baud = USB_IRDA_BR_1152000; 358 break; 359 case 4000000: 360 ir_baud = USB_IRDA_BR_4000000; 361 break; 362 default: 363 ir_baud = USB_IRDA_BR_9600; 364 baud = 9600; 365 } 366 367 if (xbof == -1) 368 ir_xbof = ir_xbof_change(ir_add_bof); 369 else 370 ir_xbof = ir_xbof_change(xbof) ; 371 372 /* Only speed changes are supported */ 373 tty_termios_copy_hw(&tty->termios, old_termios); 374 tty_encode_baud_rate(tty, baud, baud); 375 376 /* 377 * send the baud change out on an "empty" data packet 378 */ 379 urb = usb_alloc_urb(0, GFP_KERNEL); 380 if (!urb) 381 return; 382 383 transfer_buffer = kmalloc(1, GFP_KERNEL); 384 if (!transfer_buffer) 385 goto err_buf; 386 387 *transfer_buffer = ir_xbof | ir_baud; 388 389 usb_fill_bulk_urb( 390 urb, 391 port->serial->dev, 392 usb_sndbulkpipe(port->serial->dev, 393 port->bulk_out_endpointAddress), 394 transfer_buffer, 395 1, 396 ir_set_termios_callback, 397 port); 398 399 urb->transfer_flags = URB_ZERO_PACKET; 400 401 result = usb_submit_urb(urb, GFP_KERNEL); 402 if (result) { 403 dev_err(&port->dev, "%s - failed to submit urb: %d\n", 404 __func__, result); 405 goto err_subm; 406 } 407 408 usb_free_urb(urb); 409 410 return; 411 err_subm: 412 kfree(transfer_buffer); 413 err_buf: 414 usb_free_urb(urb); 415 } 416 417 static int __init ir_init(void) 418 { 419 if (buffer_size) { 420 ir_device.bulk_in_size = buffer_size; 421 ir_device.bulk_out_size = buffer_size; 422 } 423 424 return usb_serial_register_drivers(serial_drivers, KBUILD_MODNAME, ir_id_table); 425 } 426 427 static void __exit ir_exit(void) 428 { 429 usb_serial_deregister_drivers(serial_drivers); 430 } 431 432 433 module_init(ir_init); 434 module_exit(ir_exit); 435 436 MODULE_AUTHOR(DRIVER_AUTHOR); 437 MODULE_DESCRIPTION(DRIVER_DESC); 438 MODULE_LICENSE("GPL"); 439 440 module_param(xbof, int, 0); 441 MODULE_PARM_DESC(xbof, "Force specific number of XBOFs"); 442 module_param(buffer_size, int, 0); 443 MODULE_PARM_DESC(buffer_size, "Size of the transfer buffers"); 444 445