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.
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.
19 * Portions of this driver were taken from drivers/net/irda/irda-usb.c, which
23 * See Documentation/usb/usb-serial.txt for more information on using this
27 * Introduced common header to be used also in USB Gadget Framework.
28 * Still needs some other style fixes.
31 * Minimal cleanups for some of the driver problens and tty layer abuse.
32 * Still needs fixing to allow multiple dongles.
35 * moved some needed structures and #define values from the
36 * net/irda/irda-usb.h file into our file, as we don't want to depend on
37 * that codebase compiling correctly :)
40 * Added module parameter to force specific number of XBOFs.
41 * Added ir_xbof_change().
42 * Reorganized read_bulk_callback error handling.
43 * Switched from FILL_BULK_URB() to usb_fill_bulk_urb().
46 * Changed the irda_usb_find_class_desc() function based on comments and
47 * code from Martin Diehl.
50 * Added support for more IrDA USB devices.
51 * Added support for zero packet. Added buffer override paramater, so
52 * users can transfer larger packets at once if they wish. Both patches
56 * initial version released.
59 #include <linux/kernel.h>
60 #include <linux/errno.h>
61 #include <linux/init.h>
62 #include <linux/slab.h>
63 #include <linux/tty.h>
64 #include <linux/tty_driver.h>
65 #include <linux/tty_flip.h>
66 #include <linux/module.h>
67 #include <linux/spinlock.h>
68 #include <linux/uaccess.h>
69 #include <linux/usb.h>
70 #include <linux/usb/serial.h>
71 #include <linux/usb/irda.h>
76 #define DRIVER_VERSION "v0.5"
78 #define DRIVER_DESC "USB IR Dongle driver"
82 /* if overridden by the user, then use their value for the size of the read and
84 static int buffer_size;
86 /* if overridden by the user, then use the specified number of XBOFs */
89 static int ir_startup (struct usb_serial *serial);
90 static int ir_open(struct tty_struct *tty, struct usb_serial_port *port);
91 static int ir_prepare_write_buffer(struct usb_serial_port *port,
92 void *dest, size_t size);
93 static void ir_process_read_urb(struct urb *urb);
94 static void ir_set_termios(struct tty_struct *tty,
95 struct usb_serial_port *port, struct ktermios *old_termios);
97 /* Not that this lot means you can only have one per system */
100 static u8 ir_add_bof;
102 static const struct usb_device_id ir_id_table[] = {
103 { USB_DEVICE(0x050f, 0x0180) }, /* KC Technology, KC-180 */
104 { USB_DEVICE(0x08e9, 0x0100) }, /* XTNDAccess */
105 { USB_DEVICE(0x09c4, 0x0011) }, /* ACTiSys ACT-IR2000U */
106 { USB_INTERFACE_INFO(USB_CLASS_APP_SPEC, USB_SUBCLASS_IRDA, 0) },
107 { } /* Terminating entry */
110 MODULE_DEVICE_TABLE(usb, ir_id_table);
112 static struct usb_driver ir_driver = {
114 .probe = usb_serial_probe,
115 .disconnect = usb_serial_disconnect,
116 .id_table = ir_id_table,
120 static struct usb_serial_driver ir_device = {
122 .owner = THIS_MODULE,
125 .description = "IR Dongle",
126 .usb_driver = &ir_driver,
127 .id_table = ir_id_table,
129 .set_termios = ir_set_termios,
130 .attach = ir_startup,
132 .prepare_write_buffer = ir_prepare_write_buffer,
133 .process_read_urb = ir_process_read_urb,
136 static inline void irda_usb_dump_class_desc(struct usb_irda_cs_descriptor *desc)
138 dbg("bLength=%x", desc->bLength);
139 dbg("bDescriptorType=%x", desc->bDescriptorType);
140 dbg("bcdSpecRevision=%x", __le16_to_cpu(desc->bcdSpecRevision));
141 dbg("bmDataSize=%x", desc->bmDataSize);
142 dbg("bmWindowSize=%x", desc->bmWindowSize);
143 dbg("bmMinTurnaroundTime=%d", desc->bmMinTurnaroundTime);
144 dbg("wBaudRate=%x", __le16_to_cpu(desc->wBaudRate));
145 dbg("bmAdditionalBOFs=%x", desc->bmAdditionalBOFs);
146 dbg("bIrdaRateSniff=%x", desc->bIrdaRateSniff);
147 dbg("bMaxUnicastList=%x", desc->bMaxUnicastList);
150 /*------------------------------------------------------------------*/
152 * Function irda_usb_find_class_desc(dev, ifnum)
154 * Returns instance of IrDA class descriptor, or NULL if not found
156 * The class descriptor is some extra info that IrDA USB devices will
157 * offer to us, describing their IrDA characteristics. We will use that in
158 * irda_usb_init_qos()
160 * Based on the same function in drivers/net/irda/irda-usb.c
162 static struct usb_irda_cs_descriptor *
163 irda_usb_find_class_desc(struct usb_device *dev, unsigned int ifnum)
165 struct usb_irda_cs_descriptor *desc;
168 desc = kzalloc(sizeof(*desc), GFP_KERNEL);
172 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
173 USB_REQ_CS_IRDA_GET_CLASS_DESC,
174 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
175 0, ifnum, desc, sizeof(*desc), 1000);
177 dbg("%s - ret=%d", __func__, ret);
178 if (ret < sizeof(*desc)) {
179 dbg("%s - class descriptor read %s (%d)",
181 (ret < 0) ? "failed" : "too short",
185 if (desc->bDescriptorType != USB_DT_CS_IRDA) {
186 dbg("%s - bad class descriptor type", __func__);
190 irda_usb_dump_class_desc(desc);
198 static u8 ir_xbof_change(u8 xbof)
202 /* reference irda-usb.c */
236 static int ir_startup(struct usb_serial *serial)
238 struct usb_irda_cs_descriptor *irda_desc;
240 irda_desc = irda_usb_find_class_desc(serial->dev, 0);
242 dev_err(&serial->dev->dev,
243 "IRDA class descriptor not found, device not bound\n");
247 dbg("%s - Baud rates supported:%s%s%s%s%s%s%s%s%s",
249 (irda_desc->wBaudRate & USB_IRDA_BR_2400) ? " 2400" : "",
250 (irda_desc->wBaudRate & USB_IRDA_BR_9600) ? " 9600" : "",
251 (irda_desc->wBaudRate & USB_IRDA_BR_19200) ? " 19200" : "",
252 (irda_desc->wBaudRate & USB_IRDA_BR_38400) ? " 38400" : "",
253 (irda_desc->wBaudRate & USB_IRDA_BR_57600) ? " 57600" : "",
254 (irda_desc->wBaudRate & USB_IRDA_BR_115200) ? " 115200" : "",
255 (irda_desc->wBaudRate & USB_IRDA_BR_576000) ? " 576000" : "",
256 (irda_desc->wBaudRate & USB_IRDA_BR_1152000) ? " 1152000" : "",
257 (irda_desc->wBaudRate & USB_IRDA_BR_4000000) ? " 4000000" : "");
259 switch (irda_desc->bmAdditionalBOFs) {
293 static int ir_open(struct tty_struct *tty, struct usb_serial_port *port)
297 dbg("%s - port %d", __func__, port->number);
299 for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i)
300 port->write_urbs[i]->transfer_flags = URB_ZERO_PACKET;
302 /* Start reading from the device */
303 return usb_serial_generic_open(tty, port);
306 static int ir_prepare_write_buffer(struct usb_serial_port *port,
307 void *dest, size_t size)
309 unsigned char *buf = dest;
313 * The first byte of the packet we send to the device contains an
314 * inbound header which indicates an additional number of BOFs and
315 * a baud rate change.
317 * See section 5.4.2.2 of the USB IrDA spec.
319 *buf = ir_xbof | ir_baud;
321 count = kfifo_out_locked(&port->write_fifo, buf + 1, size - 1,
326 static void ir_process_read_urb(struct urb *urb)
328 struct usb_serial_port *port = urb->context;
329 unsigned char *data = urb->transfer_buffer;
330 struct tty_struct *tty;
332 if (!urb->actual_length)
335 * The first byte of the packet we get from the device
336 * contains a busy indicator and baud rate change.
337 * See section 5.4.1.2 of the USB IrDA spec.
340 ir_baud = *data & 0x0f;
342 if (urb->actual_length == 1)
345 tty = tty_port_tty_get(&port->port);
348 tty_insert_flip_string(tty, data + 1, urb->actual_length - 1);
349 tty_flip_buffer_push(tty);
353 static void ir_set_termios_callback(struct urb *urb)
355 struct usb_serial_port *port = urb->context;
356 int status = urb->status;
358 dbg("%s - port %d", __func__, port->number);
360 kfree(urb->transfer_buffer);
363 dbg("%s - non-zero urb status: %d", __func__, status);
366 static void ir_set_termios(struct tty_struct *tty,
367 struct usb_serial_port *port, struct ktermios *old_termios)
370 unsigned char *transfer_buffer;
375 dbg("%s - port %d", __func__, port->number);
377 baud = tty_get_baud_rate(tty);
380 * FIXME, we should compare the baud request against the
381 * capability stated in the IR header that we got in the
387 ir_baud = USB_IRDA_BR_2400;
390 ir_baud = USB_IRDA_BR_9600;
393 ir_baud = USB_IRDA_BR_19200;
396 ir_baud = USB_IRDA_BR_38400;
399 ir_baud = USB_IRDA_BR_57600;
402 ir_baud = USB_IRDA_BR_115200;
405 ir_baud = USB_IRDA_BR_576000;
408 ir_baud = USB_IRDA_BR_1152000;
411 ir_baud = USB_IRDA_BR_4000000;
414 ir_baud = USB_IRDA_BR_9600;
419 ir_xbof = ir_xbof_change(ir_add_bof);
421 ir_xbof = ir_xbof_change(xbof) ;
423 /* Only speed changes are supported */
424 tty_termios_copy_hw(tty->termios, old_termios);
425 tty_encode_baud_rate(tty, baud, baud);
428 * send the baud change out on an "empty" data packet
430 urb = usb_alloc_urb(0, GFP_KERNEL);
432 dev_err(&port->dev, "%s - no more urbs\n", __func__);
435 transfer_buffer = kmalloc(1, GFP_KERNEL);
436 if (!transfer_buffer) {
437 dev_err(&port->dev, "%s - out of memory\n", __func__);
441 *transfer_buffer = ir_xbof | ir_baud;
446 usb_sndbulkpipe(port->serial->dev,
447 port->bulk_out_endpointAddress),
450 ir_set_termios_callback,
453 urb->transfer_flags = URB_ZERO_PACKET;
455 result = usb_submit_urb(urb, GFP_KERNEL);
457 dev_err(&port->dev, "%s - failed to submit urb: %d\n",
466 kfree(transfer_buffer);
471 static int __init ir_init(void)
476 ir_device.bulk_in_size = buffer_size;
477 ir_device.bulk_out_size = buffer_size;
480 retval = usb_serial_register(&ir_device);
482 goto failed_usb_serial_register;
484 retval = usb_register(&ir_driver);
486 goto failed_usb_register;
488 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
494 usb_serial_deregister(&ir_device);
496 failed_usb_serial_register:
500 static void __exit ir_exit(void)
502 usb_deregister(&ir_driver);
503 usb_serial_deregister(&ir_device);
507 module_init(ir_init);
508 module_exit(ir_exit);
510 MODULE_AUTHOR(DRIVER_AUTHOR);
511 MODULE_DESCRIPTION(DRIVER_DESC);
512 MODULE_LICENSE("GPL");
514 module_param(debug, bool, S_IRUGO | S_IWUSR);
515 MODULE_PARM_DESC(debug, "Debug enabled or not");
516 module_param(xbof, int, 0);
517 MODULE_PARM_DESC(xbof, "Force specific number of XBOFs");
518 module_param(buffer_size, int, 0);
519 MODULE_PARM_DESC(buffer_size, "Size of the transfer buffers");