/* * USB IR Dongle driver * * Copyright (C) 2001-2002 Greg Kroah-Hartman (greg@kroah.com) * Copyright (C) 2002 Gary Brubaker (xavyer@ix.netcom.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 * * 2008_Jun_02 Felipe Balbi * Introduced common header to be used also in USB Gadget Framework. * Still needs some other style fixes. * * 2007_Jun_21 Alan Cox * Minimal cleanups for some of the driver problens and tty layer abuse. * Still needs fixing to allow multiple dongles. * * 2002_Mar_07 greg kh * moved some needed structures and #define values from the * net/irda/irda-usb.h file into our file, as we don't want to depend on * that codebase compiling correctly :) * * 2002_Jan_14 gb * Added module parameter to force specific number of XBOFs. * Added ir_xbof_change(). * Reorganized read_bulk_callback error handling. * Switched from FILL_BULK_URB() to usb_fill_bulk_urb(). * * 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 /* * Version Information */ #define DRIVER_VERSION "v0.4" #define DRIVER_AUTHOR "Greg Kroah-Hartman " #define DRIVER_DESC "USB IR Dongle driver" static int debug; /* if overridden by the user, then use their value for the size of the read and * write urbs */ static int buffer_size; /* if overridden by the user, then use the specified number of XBOFs */ static int xbof = -1; static int ir_startup (struct usb_serial *serial); static int ir_open(struct tty_struct *tty, struct usb_serial_port *port); static void ir_close(struct usb_serial_port *port); static int ir_write(struct tty_struct *tty, struct usb_serial_port *port, 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 tty_struct *tty, struct usb_serial_port *port, struct ktermios *old_termios); /* Not that this lot means you can only have one per system */ static u8 ir_baud; static u8 ir_xbof; static u8 ir_add_bof; static struct usb_device_id ir_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_SUBCLASS_IRDA, 0) }, { } /* Terminating entry */ }; MODULE_DEVICE_TABLE(usb, ir_id_table); static struct usb_driver ir_driver = { .name = "ir-usb", .probe = usb_serial_probe, .disconnect = usb_serial_disconnect, .id_table = ir_id_table, .no_dynamic_id = 1, }; static struct usb_serial_driver ir_device = { .driver = { .owner = THIS_MODULE, .name = "ir-usb", }, .description = "IR Dongle", .usb_driver = &ir_driver, .id_table = ir_id_table, .num_ports = 1, .set_termios = ir_set_termios, .attach = 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 usb_irda_cs_descriptor *desc) { dbg("bLength=%x", desc->bLength); dbg("bDescriptorType=%x", desc->bDescriptorType); dbg("bcdSpecRevision=%x", __le16_to_cpu(desc->bcdSpecRevision)); dbg("bmDataSize=%x", desc->bmDataSize); dbg("bmWindowSize=%x", desc->bmWindowSize); dbg("bmMinTurnaroundTime=%d", desc->bmMinTurnaroundTime); dbg("wBaudRate=%x", __le16_to_cpu(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 usb_irda_cs_descriptor * irda_usb_find_class_desc(struct usb_device *dev, unsigned int ifnum) { struct usb_irda_cs_descriptor *desc; int ret; desc = kzalloc(sizeof(*desc), GFP_KERNEL); if (!desc) return NULL; ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), USB_REQ_CS_IRDA_GET_CLASS_DESC, USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0, ifnum, desc, sizeof(*desc), 1000); dbg("%s - ret=%d", __func__, ret); if (ret < sizeof(*desc)) { dbg("%s - class descriptor read %s (%d)", __func__, (ret < 0) ? "failed" : "too short", ret); goto error; } if (desc->bDescriptorType != USB_DT_CS_IRDA) { dbg("%s - bad class descriptor type", __func__); goto error; } irda_usb_dump_class_desc(desc); return desc; error: kfree(desc); return NULL; } static u8 ir_xbof_change(u8 xbof) { u8 result; /* reference irda-usb.c */ switch (xbof) { case 48: result = 0x10; break; case 28: case 24: result = 0x20; break; default: case 12: result = 0x30; break; case 5: case 6: result = 0x40; break; case 3: result = 0x50; break; case 2: result = 0x60; break; case 1: result = 0x70; break; case 0: result = 0x80; break; } return(result); } static int ir_startup(struct usb_serial *serial) { struct usb_irda_cs_descriptor *irda_desc; irda_desc = irda_usb_find_class_desc(serial->dev, 0); if (!irda_desc) { dev_err(&serial->dev->dev, "IRDA class descriptor not found, device not bound\n"); return -ENODEV; } dbg("%s - Baud rates supported:%s%s%s%s%s%s%s%s%s", __func__, (irda_desc->wBaudRate & USB_IRDA_BR_2400) ? " 2400" : "", (irda_desc->wBaudRate & USB_IRDA_BR_9600) ? " 9600" : "", (irda_desc->wBaudRate & USB_IRDA_BR_19200) ? " 19200" : "", (irda_desc->wBaudRate & USB_IRDA_BR_38400) ? " 38400" : "", (irda_desc->wBaudRate & USB_IRDA_BR_57600) ? " 57600" : "", (irda_desc->wBaudRate & USB_IRDA_BR_115200) ? " 115200" : "", (irda_desc->wBaudRate & USB_IRDA_BR_576000) ? " 576000" : "", (irda_desc->wBaudRate & USB_IRDA_BR_1152000) ? " 1152000" : "", (irda_desc->wBaudRate & USB_IRDA_BR_4000000) ? " 4000000" : ""); switch (irda_desc->bmAdditionalBOFs) { case USB_IRDA_AB_48: ir_add_bof = 48; break; case USB_IRDA_AB_24: ir_add_bof = 24; break; case USB_IRDA_AB_12: ir_add_bof = 12; break; case USB_IRDA_AB_6: ir_add_bof = 6; break; case USB_IRDA_AB_3: ir_add_bof = 3; break; case USB_IRDA_AB_2: ir_add_bof = 2; break; case USB_IRDA_AB_1: ir_add_bof = 1; break; case USB_IRDA_AB_0: ir_add_bof = 0; break; default: break; } kfree(irda_desc); return 0; } static int ir_open(struct tty_struct *tty, struct usb_serial_port *port) { char *buffer; int result = 0; dbg("%s - port %d", __func__, port->number); if (buffer_size) { /* override the default buffer sizes */ buffer = kmalloc(buffer_size, GFP_KERNEL); if (!buffer) { dev_err(&port->dev, "%s - out of memory.\n", __func__); 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) { dev_err(&port->dev, "%s - out of memory.\n", __func__); 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 */ usb_fill_bulk_urb( port->read_urb, port->serial->dev, usb_rcvbulkpipe(port->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, GFP_KERNEL); if (result) dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __func__, result); return result; } static void ir_close(struct usb_serial_port *port) { dbg("%s - port %d", __func__, port->number); /* shutdown our bulk read */ usb_kill_urb(port->read_urb); } static int ir_write(struct tty_struct *tty, struct usb_serial_port *port, const unsigned char *buf, int count) { unsigned char *transfer_buffer; int result; int transfer_size; dbg("%s - port = %d, count = %d", __func__, port->number, count); if (count == 0) return 0; spin_lock_bh(&port->lock); if (port->write_urb_busy) { spin_unlock_bh(&port->lock); dbg("%s - already writing", __func__); return 0; } port->write_urb_busy = 1; spin_unlock_bh(&port->lock); transfer_buffer = port->write_urb->transfer_buffer; transfer_size = min(count, port->bulk_out_size - 1); /* * The first byte of the packet we send to the device contains an * inbound header which indicates an additional number of BOFs and * a baud rate change. * * See section 5.4.2.2 of the USB IrDA spec. */ *transfer_buffer = ir_xbof | ir_baud; ++transfer_buffer; memcpy(transfer_buffer, buf, transfer_size); usb_fill_bulk_urb( port->write_urb, port->serial->dev, usb_sndbulkpipe(port->serial->dev, port->bulk_out_endpointAddress), port->write_urb->transfer_buffer, transfer_size + 1, ir_write_bulk_callback, port); port->write_urb->transfer_flags = URB_ZERO_PACKET; result = usb_submit_urb(port->write_urb, GFP_ATOMIC); if (result) { port->write_urb_busy = 0; dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __func__, result); } else result = transfer_size; return result; } static void ir_write_bulk_callback(struct urb *urb) { struct usb_serial_port *port = urb->context; int status = urb->status; dbg("%s - port %d", __func__, port->number); port->write_urb_busy = 0; if (status) { dbg("%s - nonzero write bulk status received: %d", __func__, status); return; } usb_serial_debug_data( debug, &port->dev, __func__, urb->actual_length, urb->transfer_buffer); usb_serial_port_softint(port); } static void ir_read_bulk_callback(struct urb *urb) { struct usb_serial_port *port = urb->context; struct tty_struct *tty; unsigned char *data = urb->transfer_buffer; int result; int status = urb->status; dbg("%s - port %d", __func__, port->number); if (!port->port.count) { dbg("%s - port closed.", __func__); return; } switch (status) { case 0: /* Successful */ /* * The first byte of the packet we get from the device * contains a busy indicator and baud rate change. * See section 5.4.1.2 of the USB IrDA spec. */ if ((*data & 0x0f) > 0) ir_baud = *data & 0x0f; usb_serial_debug_data(debug, &port->dev, __func__, urb->actual_length, data); tty = tty_port_tty_get(&port->port); if (tty_buffer_request_room(tty, urb->actual_length - 1)) { tty_insert_flip_string(tty, data+1, urb->actual_length - 1); tty_flip_buffer_push(tty); } tty_kref_put(tty); /* * No break here. * We want to resubmit the urb so we can read * again. */ case -EPROTO: /* taking inspiration from pl2303.c */ /* Continue trying to always read */ usb_fill_bulk_urb( port->read_urb, port->serial->dev, usb_rcvbulkpipe(port->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, GFP_ATOMIC); if (result) dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n", __func__, result); break ; default: dbg("%s - nonzero read bulk status received: %d", __func__, status); break ; } return; } static void ir_set_termios(struct tty_struct *tty, struct usb_serial_port *port, struct ktermios *old_termios) { unsigned char *transfer_buffer; int result; speed_t baud; int ir_baud; dbg("%s - port %d", __func__, port->number); baud = tty_get_baud_rate(tty); /* * FIXME, we should compare the baud request against the * capability stated in the IR header that we got in the * startup function. */ switch (baud) { case 2400: ir_baud = USB_IRDA_BR_2400; break; case 9600: ir_baud = USB_IRDA_BR_9600; break; case 19200: ir_baud = USB_IRDA_BR_19200; break; case 38400: ir_baud = USB_IRDA_BR_38400; break; case 57600: ir_baud = USB_IRDA_BR_57600; break; case 115200: ir_baud = USB_IRDA_BR_115200; break; case 576000: ir_baud = USB_IRDA_BR_576000; break; case 1152000: ir_baud = USB_IRDA_BR_1152000; break; case 4000000: ir_baud = USB_IRDA_BR_4000000; break; default: ir_baud = USB_IRDA_BR_9600; baud = 9600; } if (xbof == -1) ir_xbof = ir_xbof_change(ir_add_bof); else ir_xbof = ir_xbof_change(xbof) ; /* 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 = ir_xbof | ir_baud; usb_fill_bulk_urb( port->write_urb, port->serial->dev, usb_sndbulkpipe(port->serial->dev, port->bulk_out_endpointAddress), port->write_urb->transfer_buffer, 1, ir_write_bulk_callback, port); port->write_urb->transfer_flags = URB_ZERO_PACKET; result = usb_submit_urb(port->write_urb, GFP_KERNEL); if (result) dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __func__, result); /* Only speed changes are supported */ tty_termios_copy_hw(tty->termios, old_termios); tty_encode_baud_rate(tty, baud, baud); } static int __init ir_init(void) { int retval; retval = usb_serial_register(&ir_device); if (retval) goto failed_usb_serial_register; retval = usb_register(&ir_driver); if (retval) goto failed_usb_register; printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":" DRIVER_DESC "\n"); return 0; failed_usb_register: usb_serial_deregister(&ir_device); failed_usb_serial_register: return retval; } static void __exit ir_exit(void) { usb_deregister(&ir_driver); 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_param(debug, bool, S_IRUGO | S_IWUSR); MODULE_PARM_DESC(debug, "Debug enabled or not"); module_param(xbof, int, 0); MODULE_PARM_DESC(xbof, "Force specific number of XBOFs"); module_param(buffer_size, int, 0); MODULE_PARM_DESC(buffer_size, "Size of the transfer buffers");