/* * USB IR Dongle driver * * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This driver allows a USB IrDA device to be used as a "dumb" serial device. * This can be useful if you do not have access to a full IrDA stack on the * other side of the connection. If you do have an IrDA stack on both devices, * please use the usb-irda driver, as it contains the proper error checking and * other goodness of a full IrDA stack. * * Portions of this driver were taken from drivers/net/irda/irda-usb.c, which * was written by Roman Weissgaerber , Dag Brattli * , and Jean Tourrilhes * * See Documentation/usb/usb-serial.txt for more information on using this driver * * 2001_Nov_08 greg kh * Changed the irda_usb_find_class_desc() function based on comments and * code from Martin Diehl. * * 2001_Nov_01 greg kh * Added support for more IrDA USB devices. * Added support for zero packet. Added buffer override paramater, so * users can transfer larger packets at once if they wish. Both patches * came from Dag Brattli . * * 2001_Oct_07 greg kh * initial version released. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef CONFIG_USB_SERIAL_DEBUG static int debug = 1; #else static int debug; #endif #include "usb-serial.h" /* * Version Information */ #define DRIVER_VERSION "v0.3" #define DRIVER_AUTHOR "Greg Kroah-Hartman " #define DRIVER_DESC "USB IR Dongle driver" /* if overridden by the user, then use their value for the size of the read and * write urbs */ static int buffer_size = 0; static int ir_startup (struct usb_serial *serial); static int ir_open (struct usb_serial_port *port, struct file *filep); static void ir_close (struct usb_serial_port *port, struct file *filep); static int ir_write (struct usb_serial_port *port, int from_user, const unsigned char *buf, int count); static void ir_write_bulk_callback (struct urb *urb); static void ir_read_bulk_callback (struct urb *urb); static void ir_set_termios (struct usb_serial_port *port, struct termios *old_termios); static __devinitdata struct usb_device_id id_table [] = { { USB_DEVICE(0x050f, 0x0180) }, /* KC Technology, KC-180 */ { USB_DEVICE(0x08e9, 0x0100) }, /* XTNDAccess */ { USB_DEVICE(0x09c4, 0x0011) }, /* ACTiSys ACT-IR2000U */ { USB_INTERFACE_INFO (USB_CLASS_APP_SPEC, USB_CLASS_IRDA, 0) }, { } /* Terminating entry */ }; MODULE_DEVICE_TABLE (usb, id_table); struct usb_serial_device_type ir_device = { name: "IR Dongle", id_table: id_table, needs_interrupt_in: MUST_HAVE, needs_bulk_in: MUST_HAVE, needs_bulk_out: MUST_HAVE, num_interrupt_in: 1, num_bulk_in: 1, num_bulk_out: 1, num_ports: 1, set_termios: ir_set_termios, startup: ir_startup, open: ir_open, close: ir_close, write: ir_write, write_bulk_callback: ir_write_bulk_callback, read_bulk_callback: ir_read_bulk_callback, }; static inline void irda_usb_dump_class_desc(struct irda_class_desc *desc) { dbg("bLength=%x", desc->bLength); dbg("bDescriptorType=%x", desc->bDescriptorType); dbg("bcdSpecRevision=%x", desc->bcdSpecRevision); dbg("bmDataSize=%x", desc->bmDataSize); dbg("bmWindowSize=%x", desc->bmWindowSize); dbg("bmMinTurnaroundTime=%d", desc->bmMinTurnaroundTime); dbg("wBaudRate=%x", desc->wBaudRate); dbg("bmAdditionalBOFs=%x", desc->bmAdditionalBOFs); dbg("bIrdaRateSniff=%x", desc->bIrdaRateSniff); dbg("bMaxUnicastList=%x", desc->bMaxUnicastList); } /*------------------------------------------------------------------*/ /* * Function irda_usb_find_class_desc(dev, ifnum) * * Returns instance of IrDA class descriptor, or NULL if not found * * The class descriptor is some extra info that IrDA USB devices will * offer to us, describing their IrDA characteristics. We will use that in * irda_usb_init_qos() * * Based on the same function in drivers/net/irda/irda-usb.c */ static struct irda_class_desc *irda_usb_find_class_desc(struct usb_device *dev, unsigned int ifnum) { struct irda_class_desc *desc; int ret; desc = kmalloc(sizeof (struct irda_class_desc), GFP_KERNEL); if (desc == NULL) return NULL; memset(desc, 0, sizeof(struct irda_class_desc)); ret = usb_control_msg(dev, usb_rcvctrlpipe(dev,0), IU_REQ_GET_CLASS_DESC, USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0, ifnum, desc, sizeof(*desc), MSECS_TO_JIFFIES(500)); dbg(__FUNCTION__ " - ret=%d", ret); if (ret < sizeof(*desc)) { dbg(__FUNCTION__ " - class descriptor read %s (%d)", (ret<0) ? "failed" : "too short", ret); goto error; } if (desc->bDescriptorType != USB_DT_IRDA) { dbg(__FUNCTION__ " - bad class descriptor type"); goto error; } irda_usb_dump_class_desc(desc); return desc; error: kfree(desc); return NULL; } static int ir_startup (struct usb_serial *serial) { struct irda_class_desc *irda_desc; irda_desc = irda_usb_find_class_desc (serial->dev, 0); if (irda_desc == NULL) { err ("IRDA class descriptor not found, device not bound"); return -ENODEV; } dbg (__FUNCTION__" - Baud rates supported: %s%s%s%s%s%s%s%s%s", (irda_desc->wBaudRate & 0x0001) ? "2400 " : "", irda_desc->wBaudRate & 0x0002 ? "9600 " : "", irda_desc->wBaudRate & 0x0004 ? "19200 " : "", irda_desc->wBaudRate & 0x0008 ? "38400 " : "", irda_desc->wBaudRate & 0x0010 ? "57600 " : "", irda_desc->wBaudRate & 0x0020 ? "115200 " : "", irda_desc->wBaudRate & 0x0040 ? "576000 " : "", irda_desc->wBaudRate & 0x0080 ? "1152000 " : "", irda_desc->wBaudRate & 0x0100 ? "4000000 " : ""); kfree (irda_desc); return 0; } static int ir_open (struct usb_serial_port *port, struct file *filp) { struct usb_serial *serial = port->serial; char *buffer; int result = 0; if (port_paranoia_check (port, __FUNCTION__)) return -ENODEV; dbg(__FUNCTION__ " - port %d", port->number); down (&port->sem); ++port->open_count; MOD_INC_USE_COUNT; if (!port->active) { port->active = 1; if (buffer_size) { /* override the default buffer sizes */ buffer = kmalloc (buffer_size, GFP_KERNEL); if (!buffer) { err (__FUNCTION__ " - out of memory."); return -ENOMEM; } kfree (port->read_urb->transfer_buffer); port->read_urb->transfer_buffer = buffer; port->read_urb->transfer_buffer_length = buffer_size; buffer = kmalloc (buffer_size, GFP_KERNEL); if (!buffer) { err (__FUNCTION__ " - out of memory."); return -ENOMEM; } kfree (port->write_urb->transfer_buffer); port->write_urb->transfer_buffer = buffer; port->write_urb->transfer_buffer_length = buffer_size; port->bulk_out_size = buffer_size; } /* Start reading from the device */ FILL_BULK_URB(port->read_urb, serial->dev, usb_rcvbulkpipe(serial->dev, port->bulk_in_endpointAddress), port->read_urb->transfer_buffer, port->read_urb->transfer_buffer_length, ir_read_bulk_callback, port); result = usb_submit_urb(port->read_urb); if (result) err(__FUNCTION__ " - failed submitting read urb, error %d", result); } up (&port->sem); return result; } static void ir_close (struct usb_serial_port *port, struct file * filp) { struct usb_serial *serial; if (port_paranoia_check (port, __FUNCTION__)) return; dbg(__FUNCTION__ " - port %d", port->number); serial = get_usb_serial (port, __FUNCTION__); if (!serial) return; down (&port->sem); --port->open_count; if (port->open_count <= 0) { if (serial->dev) { /* shutdown our bulk read */ usb_unlink_urb (port->read_urb); } port->active = 0; port->open_count = 0; } up (&port->sem); MOD_DEC_USE_COUNT; } static int ir_write (struct usb_serial_port *port, int from_user, const unsigned char *buf, int count) { unsigned char *transfer_buffer; int result; dbg(__FUNCTION__ " - port = %d, count = %d", port->number, count); if (!port->tty) { err (__FUNCTION__ " - no tty???"); return 0; } if (count == 0) return 0; if (port->write_urb->status == -EINPROGRESS) { dbg (__FUNCTION__ " - already writing"); return 0; } /* * The first byte of the packet we send to the device contains a BOD * and baud rate change. So we set it to 0. * See section 5.4.2.2 of the USB IrDA spec. */ transfer_buffer = port->write_urb->transfer_buffer; count = min (port->bulk_out_size-1, count); if (from_user) { if (copy_from_user (&transfer_buffer[1], buf, count)) return -EFAULT; } else { memcpy (&transfer_buffer[1], buf, count); } /* use 12 XBOF's as default */ transfer_buffer[0] = 0x30; usb_serial_debug_data (__FILE__, __FUNCTION__, count+1, transfer_buffer); port->write_urb->transfer_buffer_length = count + 1; port->write_urb->dev = port->serial->dev; port->write_urb->transfer_flags |= USB_ZERO_PACKET; result = usb_submit_urb (port->write_urb); if (result) err(__FUNCTION__ " - failed submitting write urb, error %d", result); else result = count; return result; } static void ir_write_bulk_callback (struct urb *urb) { struct usb_serial_port *port = (struct usb_serial_port *)urb->context; if (port_paranoia_check (port, __FUNCTION__)) return; dbg(__FUNCTION__ " - port %d", port->number); if (urb->status) { dbg(__FUNCTION__ " - nonzero write bulk status received: %d", urb->status); return; } queue_task(&port->tqueue, &tq_immediate); mark_bh(IMMEDIATE_BH); return; } static void ir_read_bulk_callback (struct urb *urb) { struct usb_serial_port *port = (struct usb_serial_port *)urb->context; struct usb_serial *serial = get_usb_serial (port, __FUNCTION__); struct tty_struct *tty; unsigned char *data = urb->transfer_buffer; int result; if (port_paranoia_check (port, __FUNCTION__)) return; dbg(__FUNCTION__ " - port %d", port->number); if (!serial) { dbg(__FUNCTION__ " - bad serial pointer, exiting"); return; } if (urb->status) { dbg(__FUNCTION__ " - nonzero read bulk status received: %d", urb->status); return; } usb_serial_debug_data (__FILE__, __FUNCTION__, urb->actual_length, data); /* Bypass flip-buffers, and feed the ldisc directly due to our * potentally large buffer size. Since we used to set low_latency, * this is exactly what the tty layer did anyway :) */ tty = port->tty; tty->ldisc.receive_buf(tty, data+1, NULL, urb->actual_length-1); /* Continue trying to always read */ FILL_BULK_URB(port->read_urb, serial->dev, usb_rcvbulkpipe(serial->dev, port->bulk_in_endpointAddress), port->read_urb->transfer_buffer, port->read_urb->transfer_buffer_length, ir_read_bulk_callback, port); result = usb_submit_urb(port->read_urb); if (result) err(__FUNCTION__ " - failed resubmitting read urb, error %d", result); return; } static void ir_set_termios (struct usb_serial_port *port, struct termios *old_termios) { unsigned char *transfer_buffer; unsigned int cflag; int result; u8 baud; dbg(__FUNCTION__ " - port %d", port->number); if ((!port->tty) || (!port->tty->termios)) { dbg(__FUNCTION__" - no tty structures"); return; } cflag = port->tty->termios->c_cflag; /* check that they really want us to change something */ if (old_termios) { if ((cflag == old_termios->c_cflag) && (RELEVANT_IFLAG(port->tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) { dbg(__FUNCTION__ " - nothing to change..."); return; } } /* All we can change is the baud rate */ if (cflag & CBAUD) { dbg (__FUNCTION__ " - asking for baud %d", tty_get_baud_rate(port->tty)); /* * FIXME, we should compare the baud request against the * capability stated in the IR header that we got in the * startup funtion. */ switch (cflag & CBAUD) { case B2400: baud = SPEED_2400; break; case B9600: baud = SPEED_9600; break; case B19200: baud = SPEED_19200; break; case B38400: baud = SPEED_38400; break; case B57600: baud = SPEED_57600; break; case B115200: baud = SPEED_115200; break; case B576000: baud = SPEED_576000; break; case B1152000: baud = SPEED_1152000; break; case B4000000: baud = SPEED_4000000; break; default: err ("ir-usb driver does not support the baudrate (%d) requested", tty_get_baud_rate(port->tty)); return; } /* FIXME need to check to see if our write urb is busy right * now, or use a urb pool. */ /* send the baud change out on an "empty" data packet */ transfer_buffer = port->write_urb->transfer_buffer; transfer_buffer[0] = baud; port->write_urb->transfer_buffer_length = 1; port->write_urb->dev = port->serial->dev; result = usb_submit_urb (port->write_urb); if (result) err(__FUNCTION__ " - failed submitting write urb, error %d", result); } return; } static int __init ir_init (void) { usb_serial_register (&ir_device); info(DRIVER_DESC " " DRIVER_VERSION); return 0; } static void __exit ir_exit (void) { usb_serial_deregister (&ir_device); } module_init(ir_init); module_exit(ir_exit); MODULE_AUTHOR(DRIVER_AUTHOR); MODULE_DESCRIPTION(DRIVER_DESC); MODULE_LICENSE("GPL"); MODULE_PARM(debug, "i"); MODULE_PARM_DESC(debug, "Debug enabled or not"); MODULE_PARM(buffer_size, "i"); MODULE_PARM_DESC(buffer_size, "Size of the transfer buffers");