629 lines
17 KiB
C
629 lines
17 KiB
C
/*
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* USB IR Dongle driver
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*
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* Copyright (C) 2001-2002 Greg Kroah-Hartman (greg@kroah.com)
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* Copyright (C) 2002 Gary Brubaker (xavyer@ix.netcom.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This driver allows a USB IrDA device to be used as a "dumb" serial device.
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* This can be useful if you do not have access to a full IrDA stack on the
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* other side of the connection. If you do have an IrDA stack on both devices,
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* please use the usb-irda driver, as it contains the proper error checking and
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* other goodness of a full IrDA stack.
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*
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* Portions of this driver were taken from drivers/net/irda/irda-usb.c, which
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* was written by Roman Weissgaerber <weissg@vienna.at>, Dag Brattli
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* <dag@brattli.net>, and Jean Tourrilhes <jt@hpl.hp.com>
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*
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* See Documentation/usb/usb-serial.txt for more information on using this driver
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*
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* 2002_Mar_07 greg kh
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* moved some needed structures and #define values from the
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* net/irda/irda-usb.h file into our file, as we don't want to depend on
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* that codebase compiling correctly :)
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*
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* 2002_Jan_14 gb
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* Added module parameter to force specific number of XBOFs.
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* Added ir_xbof_change().
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* Reorganized read_bulk_callback error handling.
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* Switched from FILL_BULK_URB() to usb_fill_bulk_urb().
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*
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* 2001_Nov_08 greg kh
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* Changed the irda_usb_find_class_desc() function based on comments and
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* code from Martin Diehl.
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*
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* 2001_Nov_01 greg kh
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* Added support for more IrDA USB devices.
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* Added support for zero packet. Added buffer override paramater, so
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* users can transfer larger packets at once if they wish. Both patches
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* came from Dag Brattli <dag@obexcode.com>.
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*
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* 2001_Oct_07 greg kh
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* initial version released.
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*/
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#include <linux/config.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/tty.h>
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#include <linux/tty_driver.h>
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#include <linux/tty_flip.h>
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <asm/uaccess.h>
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#include <linux/usb.h>
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#include "usb-serial.h"
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/*
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* Version Information
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*/
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#define DRIVER_VERSION "v0.4"
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#define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>"
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#define DRIVER_DESC "USB IR Dongle driver"
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/* USB IrDA class spec information */
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#define USB_CLASS_IRDA 0x02
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#define USB_DT_IRDA 0x21
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#define IU_REQ_GET_CLASS_DESC 0x06
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#define SPEED_2400 0x01
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#define SPEED_9600 0x02
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#define SPEED_19200 0x03
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#define SPEED_38400 0x04
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#define SPEED_57600 0x05
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#define SPEED_115200 0x06
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#define SPEED_576000 0x07
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#define SPEED_1152000 0x08
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#define SPEED_4000000 0x09
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struct irda_class_desc {
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u8 bLength;
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u8 bDescriptorType;
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u16 bcdSpecRevision;
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u8 bmDataSize;
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u8 bmWindowSize;
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u8 bmMinTurnaroundTime;
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u16 wBaudRate;
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u8 bmAdditionalBOFs;
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u8 bIrdaRateSniff;
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u8 bMaxUnicastList;
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} __attribute__ ((packed));
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static int debug;
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/* if overridden by the user, then use their value for the size of the read and
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* write urbs */
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static int buffer_size;
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/* if overridden by the user, then use the specified number of XBOFs */
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static int xbof = -1;
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static int ir_startup (struct usb_serial *serial);
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static int ir_open (struct usb_serial_port *port, struct file *filep);
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static void ir_close (struct usb_serial_port *port, struct file *filep);
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static int ir_write (struct usb_serial_port *port, const unsigned char *buf, int count);
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static void ir_write_bulk_callback (struct urb *urb, struct pt_regs *regs);
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static void ir_read_bulk_callback (struct urb *urb, struct pt_regs *regs);
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static void ir_set_termios (struct usb_serial_port *port, struct termios *old_termios);
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static u8 ir_baud = 0;
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static u8 ir_xbof = 0;
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static u8 ir_add_bof = 0;
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static struct usb_device_id id_table [] = {
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{ USB_DEVICE(0x050f, 0x0180) }, /* KC Technology, KC-180 */
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{ USB_DEVICE(0x08e9, 0x0100) }, /* XTNDAccess */
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{ USB_DEVICE(0x09c4, 0x0011) }, /* ACTiSys ACT-IR2000U */
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{ USB_INTERFACE_INFO (USB_CLASS_APP_SPEC, USB_CLASS_IRDA, 0) },
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{ } /* Terminating entry */
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};
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MODULE_DEVICE_TABLE (usb, id_table);
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static struct usb_driver ir_driver = {
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.name = "ir-usb",
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.probe = usb_serial_probe,
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.disconnect = usb_serial_disconnect,
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.id_table = id_table,
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.no_dynamic_id = 1,
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};
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static struct usb_serial_driver ir_device = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "ir-usb",
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},
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.description = "IR Dongle",
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.id_table = id_table,
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.num_interrupt_in = 1,
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.num_bulk_in = 1,
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.num_bulk_out = 1,
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.num_ports = 1,
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.set_termios = ir_set_termios,
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.attach = ir_startup,
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.open = ir_open,
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.close = ir_close,
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.write = ir_write,
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.write_bulk_callback = ir_write_bulk_callback,
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.read_bulk_callback = ir_read_bulk_callback,
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};
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static inline void irda_usb_dump_class_desc(struct irda_class_desc *desc)
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{
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dbg("bLength=%x", desc->bLength);
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dbg("bDescriptorType=%x", desc->bDescriptorType);
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dbg("bcdSpecRevision=%x", desc->bcdSpecRevision);
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dbg("bmDataSize=%x", desc->bmDataSize);
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dbg("bmWindowSize=%x", desc->bmWindowSize);
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dbg("bmMinTurnaroundTime=%d", desc->bmMinTurnaroundTime);
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dbg("wBaudRate=%x", desc->wBaudRate);
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dbg("bmAdditionalBOFs=%x", desc->bmAdditionalBOFs);
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dbg("bIrdaRateSniff=%x", desc->bIrdaRateSniff);
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dbg("bMaxUnicastList=%x", desc->bMaxUnicastList);
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}
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/*------------------------------------------------------------------*/
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/*
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* Function irda_usb_find_class_desc(dev, ifnum)
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*
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* Returns instance of IrDA class descriptor, or NULL if not found
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*
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* The class descriptor is some extra info that IrDA USB devices will
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* offer to us, describing their IrDA characteristics. We will use that in
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* irda_usb_init_qos()
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*
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* Based on the same function in drivers/net/irda/irda-usb.c
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*/
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static struct irda_class_desc *irda_usb_find_class_desc(struct usb_device *dev, unsigned int ifnum)
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{
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struct irda_class_desc *desc;
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int ret;
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desc = kmalloc(sizeof (struct irda_class_desc), GFP_KERNEL);
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if (desc == NULL)
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return NULL;
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memset(desc, 0, sizeof(struct irda_class_desc));
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ret = usb_control_msg(dev, usb_rcvctrlpipe(dev,0),
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IU_REQ_GET_CLASS_DESC,
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USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
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0, ifnum, desc, sizeof(*desc), 1000);
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dbg("%s - ret=%d", __FUNCTION__, ret);
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if (ret < sizeof(*desc)) {
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dbg("%s - class descriptor read %s (%d)",
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__FUNCTION__,
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(ret<0) ? "failed" : "too short",
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ret);
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goto error;
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}
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if (desc->bDescriptorType != USB_DT_IRDA) {
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dbg("%s - bad class descriptor type", __FUNCTION__);
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goto error;
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}
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irda_usb_dump_class_desc(desc);
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return desc;
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error:
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kfree(desc);
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return NULL;
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}
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static u8 ir_xbof_change(u8 xbof)
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{
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u8 result;
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/* reference irda-usb.c */
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switch(xbof) {
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case 48: result = 0x10; break;
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case 28:
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case 24: result = 0x20; break;
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default:
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case 12: result = 0x30; break;
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case 5:
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case 6: result = 0x40; break;
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case 3: result = 0x50; break;
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case 2: result = 0x60; break;
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case 1: result = 0x70; break;
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case 0: result = 0x80; break;
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}
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return(result);
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}
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static int ir_startup (struct usb_serial *serial)
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{
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struct irda_class_desc *irda_desc;
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irda_desc = irda_usb_find_class_desc (serial->dev, 0);
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if (irda_desc == NULL) {
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dev_err (&serial->dev->dev, "IRDA class descriptor not found, device not bound\n");
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return -ENODEV;
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}
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dbg ("%s - Baud rates supported:%s%s%s%s%s%s%s%s%s",
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__FUNCTION__,
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(irda_desc->wBaudRate & 0x0001) ? " 2400" : "",
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(irda_desc->wBaudRate & 0x0002) ? " 9600" : "",
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(irda_desc->wBaudRate & 0x0004) ? " 19200" : "",
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(irda_desc->wBaudRate & 0x0008) ? " 38400" : "",
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(irda_desc->wBaudRate & 0x0010) ? " 57600" : "",
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(irda_desc->wBaudRate & 0x0020) ? " 115200" : "",
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(irda_desc->wBaudRate & 0x0040) ? " 576000" : "",
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(irda_desc->wBaudRate & 0x0080) ? " 1152000" : "",
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(irda_desc->wBaudRate & 0x0100) ? " 4000000" : "");
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switch( irda_desc->bmAdditionalBOFs ) {
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case 0x01: ir_add_bof = 48; break;
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case 0x02: ir_add_bof = 24; break;
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case 0x04: ir_add_bof = 12; break;
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case 0x08: ir_add_bof = 6; break;
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case 0x10: ir_add_bof = 3; break;
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case 0x20: ir_add_bof = 2; break;
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case 0x40: ir_add_bof = 1; break;
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case 0x80: ir_add_bof = 0; break;
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default:;
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}
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kfree (irda_desc);
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return 0;
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}
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static int ir_open (struct usb_serial_port *port, struct file *filp)
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{
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char *buffer;
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int result = 0;
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dbg("%s - port %d", __FUNCTION__, port->number);
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if (buffer_size) {
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/* override the default buffer sizes */
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buffer = kmalloc (buffer_size, GFP_KERNEL);
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if (!buffer) {
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dev_err (&port->dev, "%s - out of memory.\n", __FUNCTION__);
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return -ENOMEM;
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}
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kfree (port->read_urb->transfer_buffer);
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port->read_urb->transfer_buffer = buffer;
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port->read_urb->transfer_buffer_length = buffer_size;
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buffer = kmalloc (buffer_size, GFP_KERNEL);
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if (!buffer) {
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dev_err (&port->dev, "%s - out of memory.\n", __FUNCTION__);
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return -ENOMEM;
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}
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kfree (port->write_urb->transfer_buffer);
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port->write_urb->transfer_buffer = buffer;
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port->write_urb->transfer_buffer_length = buffer_size;
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port->bulk_out_size = buffer_size;
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}
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/* Start reading from the device */
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usb_fill_bulk_urb (
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port->read_urb,
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port->serial->dev,
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usb_rcvbulkpipe(port->serial->dev, port->bulk_in_endpointAddress),
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port->read_urb->transfer_buffer,
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port->read_urb->transfer_buffer_length,
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ir_read_bulk_callback,
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port);
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result = usb_submit_urb(port->read_urb, GFP_KERNEL);
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if (result)
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dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __FUNCTION__, result);
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return result;
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}
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static void ir_close (struct usb_serial_port *port, struct file * filp)
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{
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dbg("%s - port %d", __FUNCTION__, port->number);
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/* shutdown our bulk read */
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usb_kill_urb(port->read_urb);
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}
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static int ir_write (struct usb_serial_port *port, const unsigned char *buf, int count)
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{
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unsigned char *transfer_buffer;
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int result;
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int transfer_size;
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dbg("%s - port = %d, count = %d", __FUNCTION__, port->number, count);
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if (!port->tty) {
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dev_err (&port->dev, "%s - no tty???\n", __FUNCTION__);
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return 0;
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}
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if (count == 0)
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return 0;
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spin_lock(&port->lock);
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if (port->write_urb_busy) {
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spin_unlock(&port->lock);
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dbg("%s - already writing", __FUNCTION__);
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return 0;
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}
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port->write_urb_busy = 1;
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spin_unlock(&port->lock);
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transfer_buffer = port->write_urb->transfer_buffer;
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transfer_size = min(count, port->bulk_out_size - 1);
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/*
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* The first byte of the packet we send to the device contains an
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* inband header which indicates an additional number of BOFs and
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* a baud rate change.
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*
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* See section 5.4.2.2 of the USB IrDA spec.
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*/
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*transfer_buffer = ir_xbof | ir_baud;
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++transfer_buffer;
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memcpy (transfer_buffer, buf, transfer_size);
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usb_fill_bulk_urb (
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port->write_urb,
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port->serial->dev,
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usb_sndbulkpipe(port->serial->dev,
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port->bulk_out_endpointAddress),
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port->write_urb->transfer_buffer,
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transfer_size + 1,
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ir_write_bulk_callback,
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port);
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port->write_urb->transfer_flags = URB_ZERO_PACKET;
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|
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result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
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if (result) {
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port->write_urb_busy = 0;
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dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
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} else
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result = transfer_size;
|
|
|
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return result;
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}
|
|
|
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static void ir_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
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{
|
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struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
|
|
|
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dbg("%s - port %d", __FUNCTION__, port->number);
|
|
|
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port->write_urb_busy = 0;
|
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if (urb->status) {
|
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dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
|
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return;
|
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}
|
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|
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usb_serial_debug_data (
|
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debug,
|
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&port->dev,
|
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__FUNCTION__,
|
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urb->actual_length,
|
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urb->transfer_buffer);
|
|
|
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schedule_work(&port->work);
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}
|
|
|
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static void ir_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
|
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{
|
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struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
|
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struct tty_struct *tty;
|
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unsigned char *data = urb->transfer_buffer;
|
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int result;
|
|
|
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dbg("%s - port %d", __FUNCTION__, port->number);
|
|
|
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if (!port->open_count) {
|
|
dbg("%s - port closed.", __FUNCTION__);
|
|
return;
|
|
}
|
|
|
|
switch (urb->status) {
|
|
|
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case 0: /* Successful */
|
|
|
|
/*
|
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* 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.
|
|
*/
|
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if ((*data & 0x0f) > 0)
|
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ir_baud = *data & 0x0f;
|
|
|
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usb_serial_debug_data (
|
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debug,
|
|
&port->dev,
|
|
__FUNCTION__,
|
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urb->actual_length,
|
|
data);
|
|
|
|
/*
|
|
* Bypass flip-buffers, and feed the ldisc directly
|
|
* due to our potentially large buffer size. Since we
|
|
* used to set low_latency, this is exactly what the
|
|
* tty layer did anyway :)
|
|
*/
|
|
tty = port->tty;
|
|
|
|
/*
|
|
* FIXME: must not do this in IRQ context,
|
|
* must honour TTY_DONT_FLIP
|
|
*/
|
|
tty->ldisc.receive_buf(
|
|
tty,
|
|
data+1,
|
|
NULL,
|
|
urb->actual_length-1);
|
|
|
|
/*
|
|
* 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",
|
|
__FUNCTION__, result);
|
|
|
|
break ;
|
|
|
|
default:
|
|
dbg("%s - nonzero read bulk status received: %d",
|
|
__FUNCTION__,
|
|
urb->status);
|
|
break ;
|
|
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
static void ir_set_termios (struct usb_serial_port *port, struct termios *old_termios)
|
|
{
|
|
unsigned char *transfer_buffer;
|
|
unsigned int cflag;
|
|
int result;
|
|
|
|
dbg("%s - port %d", __FUNCTION__, port->number);
|
|
|
|
if ((!port->tty) || (!port->tty->termios)) {
|
|
dbg("%s - no tty structures", __FUNCTION__);
|
|
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("%s - nothing to change...", __FUNCTION__);
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* All we can change is the baud rate */
|
|
if (cflag & CBAUD) {
|
|
|
|
dbg ("%s - asking for baud %d",
|
|
__FUNCTION__,
|
|
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 function.
|
|
*/
|
|
switch (cflag & CBAUD) {
|
|
case B2400: ir_baud = SPEED_2400; break;
|
|
default:
|
|
case B9600: ir_baud = SPEED_9600; break;
|
|
case B19200: ir_baud = SPEED_19200; break;
|
|
case B38400: ir_baud = SPEED_38400; break;
|
|
case B57600: ir_baud = SPEED_57600; break;
|
|
case B115200: ir_baud = SPEED_115200; break;
|
|
case B576000: ir_baud = SPEED_576000; break;
|
|
case B1152000: ir_baud = SPEED_1152000; break;
|
|
#ifdef B4000000
|
|
case B4000000: ir_baud = SPEED_4000000; break;
|
|
#endif
|
|
}
|
|
|
|
if (xbof == -1) {
|
|
ir_xbof = ir_xbof_change(ir_add_bof);
|
|
} else {
|
|
ir_xbof = ir_xbof_change(xbof) ;
|
|
}
|
|
|
|
/* Notify the tty driver that the termios have changed. */
|
|
port->tty->ldisc.set_termios(port->tty, NULL);
|
|
|
|
/* 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", __FUNCTION__, result);
|
|
}
|
|
return;
|
|
}
|
|
|
|
|
|
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;
|
|
info(DRIVER_DESC " " DRIVER_VERSION);
|
|
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");
|
|
|