516 lines
12 KiB
C
516 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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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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* Copyright (C) 2010 Johan Hovold (jhovold@gmail.com)
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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.rst for more information on using this
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* driver
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*/
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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 <linux/uaccess.h>
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#include <linux/usb.h>
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#include <linux/usb/serial.h>
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#include <linux/usb/irda.h>
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#define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>, Johan Hovold <jhovold@gmail.com>"
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#define DRIVER_DESC "USB IR Dongle driver"
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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_write(struct tty_struct *tty, struct usb_serial_port *port,
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const unsigned char *buf, int count);
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static int ir_write_room(struct tty_struct *tty);
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static void ir_write_bulk_callback(struct urb *urb);
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static void ir_process_read_urb(struct urb *urb);
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static void ir_set_termios(struct tty_struct *tty,
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struct usb_serial_port *port, struct ktermios *old_termios);
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/* Not that this lot means you can only have one per system */
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static u8 ir_baud;
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static u8 ir_xbof;
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static u8 ir_add_bof;
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static const struct usb_device_id ir_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_SUBCLASS_IRDA, 0) },
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{ } /* Terminating entry */
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};
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MODULE_DEVICE_TABLE(usb, ir_id_table);
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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 = ir_id_table,
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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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.write = ir_write,
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.write_room = ir_write_room,
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.write_bulk_callback = ir_write_bulk_callback,
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.process_read_urb = ir_process_read_urb,
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};
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static struct usb_serial_driver * const serial_drivers[] = {
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&ir_device, NULL
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};
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static inline void irda_usb_dump_class_desc(struct usb_serial *serial,
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struct usb_irda_cs_descriptor *desc)
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{
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struct device *dev = &serial->dev->dev;
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dev_dbg(dev, "bLength=%x\n", desc->bLength);
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dev_dbg(dev, "bDescriptorType=%x\n", desc->bDescriptorType);
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dev_dbg(dev, "bcdSpecRevision=%x\n", __le16_to_cpu(desc->bcdSpecRevision));
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dev_dbg(dev, "bmDataSize=%x\n", desc->bmDataSize);
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dev_dbg(dev, "bmWindowSize=%x\n", desc->bmWindowSize);
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dev_dbg(dev, "bmMinTurnaroundTime=%d\n", desc->bmMinTurnaroundTime);
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dev_dbg(dev, "wBaudRate=%x\n", __le16_to_cpu(desc->wBaudRate));
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dev_dbg(dev, "bmAdditionalBOFs=%x\n", desc->bmAdditionalBOFs);
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dev_dbg(dev, "bIrdaRateSniff=%x\n", desc->bIrdaRateSniff);
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dev_dbg(dev, "bMaxUnicastList=%x\n", 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 usb_irda_cs_descriptor *
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irda_usb_find_class_desc(struct usb_serial *serial, unsigned int ifnum)
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{
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struct usb_device *dev = serial->dev;
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struct usb_irda_cs_descriptor *desc;
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int ret;
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desc = kzalloc(sizeof(*desc), GFP_KERNEL);
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if (!desc)
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return NULL;
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ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
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USB_REQ_CS_IRDA_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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dev_dbg(&serial->dev->dev, "%s - ret=%d\n", __func__, ret);
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if (ret < (int)sizeof(*desc)) {
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dev_dbg(&serial->dev->dev,
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"%s - class descriptor read %s (%d)\n", __func__,
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(ret < 0) ? "failed" : "too short", ret);
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goto error;
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}
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if (desc->bDescriptorType != USB_DT_CS_IRDA) {
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dev_dbg(&serial->dev->dev, "%s - bad class descriptor type\n",
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__func__);
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goto error;
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}
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irda_usb_dump_class_desc(serial, 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:
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result = 0x10;
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break;
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case 28:
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case 24:
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result = 0x20;
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break;
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default:
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case 12:
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result = 0x30;
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break;
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case 5:
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case 6:
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result = 0x40;
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break;
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case 3:
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result = 0x50;
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break;
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case 2:
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result = 0x60;
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break;
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case 1:
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result = 0x70;
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break;
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case 0:
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result = 0x80;
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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 usb_irda_cs_descriptor *irda_desc;
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int rates;
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if (serial->num_bulk_in < 1 || serial->num_bulk_out < 1)
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return -ENODEV;
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irda_desc = irda_usb_find_class_desc(serial, 0);
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if (!irda_desc) {
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dev_err(&serial->dev->dev,
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"IRDA class descriptor not found, device not bound\n");
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return -ENODEV;
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}
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rates = le16_to_cpu(irda_desc->wBaudRate);
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dev_dbg(&serial->dev->dev,
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"%s - Baud rates supported:%s%s%s%s%s%s%s%s%s\n",
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__func__,
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(rates & USB_IRDA_BR_2400) ? " 2400" : "",
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(rates & USB_IRDA_BR_9600) ? " 9600" : "",
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(rates & USB_IRDA_BR_19200) ? " 19200" : "",
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(rates & USB_IRDA_BR_38400) ? " 38400" : "",
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(rates & USB_IRDA_BR_57600) ? " 57600" : "",
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(rates & USB_IRDA_BR_115200) ? " 115200" : "",
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(rates & USB_IRDA_BR_576000) ? " 576000" : "",
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(rates & USB_IRDA_BR_1152000) ? " 1152000" : "",
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(rates & USB_IRDA_BR_4000000) ? " 4000000" : "");
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switch (irda_desc->bmAdditionalBOFs) {
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case USB_IRDA_AB_48:
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ir_add_bof = 48;
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break;
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case USB_IRDA_AB_24:
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ir_add_bof = 24;
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break;
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case USB_IRDA_AB_12:
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ir_add_bof = 12;
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break;
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case USB_IRDA_AB_6:
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ir_add_bof = 6;
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break;
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case USB_IRDA_AB_3:
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ir_add_bof = 3;
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break;
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case USB_IRDA_AB_2:
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ir_add_bof = 2;
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break;
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case USB_IRDA_AB_1:
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ir_add_bof = 1;
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break;
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case USB_IRDA_AB_0:
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ir_add_bof = 0;
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break;
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default:
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break;
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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_write(struct tty_struct *tty, struct usb_serial_port *port,
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const unsigned char *buf, int count)
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{
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struct urb *urb = NULL;
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unsigned long flags;
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int ret;
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if (port->bulk_out_size == 0)
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return -EINVAL;
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if (count == 0)
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return 0;
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count = min(count, port->bulk_out_size - 1);
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spin_lock_irqsave(&port->lock, flags);
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if (__test_and_clear_bit(0, &port->write_urbs_free)) {
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urb = port->write_urbs[0];
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port->tx_bytes += count;
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}
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spin_unlock_irqrestore(&port->lock, flags);
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if (!urb)
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return 0;
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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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* outbound 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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*(u8 *)urb->transfer_buffer = ir_xbof | ir_baud;
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memcpy(urb->transfer_buffer + 1, buf, count);
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urb->transfer_buffer_length = count + 1;
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urb->transfer_flags = URB_ZERO_PACKET;
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ret = usb_submit_urb(urb, GFP_ATOMIC);
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if (ret) {
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dev_err(&port->dev, "failed to submit write urb: %d\n", ret);
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spin_lock_irqsave(&port->lock, flags);
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__set_bit(0, &port->write_urbs_free);
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port->tx_bytes -= count;
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spin_unlock_irqrestore(&port->lock, flags);
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return ret;
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}
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return count;
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}
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static void ir_write_bulk_callback(struct urb *urb)
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{
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struct usb_serial_port *port = urb->context;
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int status = urb->status;
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unsigned long flags;
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spin_lock_irqsave(&port->lock, flags);
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__set_bit(0, &port->write_urbs_free);
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port->tx_bytes -= urb->transfer_buffer_length - 1;
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spin_unlock_irqrestore(&port->lock, flags);
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switch (status) {
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case 0:
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break;
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case -ENOENT:
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case -ECONNRESET:
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case -ESHUTDOWN:
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dev_dbg(&port->dev, "write urb stopped: %d\n", status);
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return;
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case -EPIPE:
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dev_err(&port->dev, "write urb stopped: %d\n", status);
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return;
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default:
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dev_err(&port->dev, "nonzero write-urb status: %d\n", status);
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break;
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}
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usb_serial_port_softint(port);
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}
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static int ir_write_room(struct tty_struct *tty)
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{
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struct usb_serial_port *port = tty->driver_data;
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int count = 0;
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if (port->bulk_out_size == 0)
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return 0;
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if (test_bit(0, &port->write_urbs_free))
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count = port->bulk_out_size - 1;
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return count;
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}
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static void ir_process_read_urb(struct urb *urb)
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{
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struct usb_serial_port *port = urb->context;
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unsigned char *data = urb->transfer_buffer;
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if (!urb->actual_length)
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return;
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/*
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* The first byte of the packet we get from the device
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* contains a busy indicator and baud rate change.
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* See section 5.4.1.2 of the USB IrDA spec.
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*/
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if (*data & 0x0f)
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ir_baud = *data & 0x0f;
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if (urb->actual_length == 1)
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return;
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tty_insert_flip_string(&port->port, data + 1, urb->actual_length - 1);
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tty_flip_buffer_push(&port->port);
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}
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static void ir_set_termios_callback(struct urb *urb)
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{
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kfree(urb->transfer_buffer);
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if (urb->status)
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dev_dbg(&urb->dev->dev, "%s - non-zero urb status: %d\n",
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__func__, urb->status);
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}
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static void ir_set_termios(struct tty_struct *tty,
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struct usb_serial_port *port, struct ktermios *old_termios)
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{
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struct urb *urb;
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unsigned char *transfer_buffer;
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int result;
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speed_t baud;
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int ir_baud;
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baud = tty_get_baud_rate(tty);
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/*
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* FIXME, we should compare the baud request against the
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* capability stated in the IR header that we got in the
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* startup function.
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*/
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switch (baud) {
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case 2400:
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ir_baud = USB_IRDA_LS_2400;
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break;
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case 9600:
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ir_baud = USB_IRDA_LS_9600;
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break;
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case 19200:
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ir_baud = USB_IRDA_LS_19200;
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break;
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case 38400:
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ir_baud = USB_IRDA_LS_38400;
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break;
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case 57600:
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ir_baud = USB_IRDA_LS_57600;
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break;
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case 115200:
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ir_baud = USB_IRDA_LS_115200;
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break;
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case 576000:
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ir_baud = USB_IRDA_LS_576000;
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break;
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case 1152000:
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ir_baud = USB_IRDA_LS_1152000;
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break;
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case 4000000:
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ir_baud = USB_IRDA_LS_4000000;
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break;
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default:
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ir_baud = USB_IRDA_LS_9600;
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baud = 9600;
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}
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if (xbof == -1)
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ir_xbof = ir_xbof_change(ir_add_bof);
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else
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ir_xbof = ir_xbof_change(xbof) ;
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/* Only speed changes are supported */
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tty_termios_copy_hw(&tty->termios, old_termios);
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tty_encode_baud_rate(tty, baud, baud);
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/*
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* send the baud change out on an "empty" data packet
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*/
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urb = usb_alloc_urb(0, GFP_KERNEL);
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if (!urb)
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return;
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transfer_buffer = kmalloc(1, GFP_KERNEL);
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if (!transfer_buffer)
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goto err_buf;
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*transfer_buffer = ir_xbof | ir_baud;
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usb_fill_bulk_urb(
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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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transfer_buffer,
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1,
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ir_set_termios_callback,
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port);
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urb->transfer_flags = URB_ZERO_PACKET;
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result = usb_submit_urb(urb, GFP_KERNEL);
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if (result) {
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dev_err(&port->dev, "%s - failed to submit urb: %d\n",
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__func__, result);
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goto err_subm;
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}
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usb_free_urb(urb);
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return;
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err_subm:
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kfree(transfer_buffer);
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err_buf:
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usb_free_urb(urb);
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}
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static int __init ir_init(void)
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{
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if (buffer_size) {
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ir_device.bulk_in_size = buffer_size;
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ir_device.bulk_out_size = buffer_size;
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}
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return usb_serial_register_drivers(serial_drivers, KBUILD_MODNAME, ir_id_table);
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}
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static void __exit ir_exit(void)
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{
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usb_serial_deregister_drivers(serial_drivers);
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}
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module_init(ir_init);
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module_exit(ir_exit);
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MODULE_AUTHOR(DRIVER_AUTHOR);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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module_param(xbof, int, 0);
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MODULE_PARM_DESC(xbof, "Force specific number of XBOFs");
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module_param(buffer_size, int, 0);
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MODULE_PARM_DESC(buffer_size, "Size of the transfer buffers");
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