v4.19.13 snapshot.
diff --git a/drivers/usb/serial/ir-usb.c b/drivers/usb/serial/ir-usb.c
new file mode 100644
index 0000000..7643716
--- /dev/null
+++ b/drivers/usb/serial/ir-usb.c
@@ -0,0 +1,443 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * USB IR Dongle driver
+ *
+ * Copyright (C) 2001-2002 Greg Kroah-Hartman (greg@kroah.com)
+ * Copyright (C) 2002 Gary Brubaker (xavyer@ix.netcom.com)
+ * Copyright (C) 2010 Johan Hovold (jhovold@gmail.com)
+ *
+ * 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 <weissg@vienna.at>, Dag Brattli
+ * <dag@brattli.net>, and Jean Tourrilhes <jt@hpl.hp.com>
+ *
+ * See Documentation/usb/usb-serial.txt for more information on using this
+ * driver
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/tty_driver.h>
+#include <linux/tty_flip.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/uaccess.h>
+#include <linux/usb.h>
+#include <linux/usb/serial.h>
+#include <linux/usb/irda.h>
+
+#define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>, Johan Hovold <jhovold@gmail.com>"
+#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;
+
+/* 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 int ir_prepare_write_buffer(struct usb_serial_port *port,
+ void *dest, size_t size);
+static void ir_process_read_urb(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 const 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_serial_driver ir_device = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "ir-usb",
+ },
+ .description = "IR Dongle",
+ .id_table = ir_id_table,
+ .num_ports = 1,
+ .set_termios = ir_set_termios,
+ .attach = ir_startup,
+ .open = ir_open,
+ .prepare_write_buffer = ir_prepare_write_buffer,
+ .process_read_urb = ir_process_read_urb,
+};
+
+static struct usb_serial_driver * const serial_drivers[] = {
+ &ir_device, NULL
+};
+
+static inline void irda_usb_dump_class_desc(struct usb_serial *serial,
+ struct usb_irda_cs_descriptor *desc)
+{
+ struct device *dev = &serial->dev->dev;
+
+ dev_dbg(dev, "bLength=%x\n", desc->bLength);
+ dev_dbg(dev, "bDescriptorType=%x\n", desc->bDescriptorType);
+ dev_dbg(dev, "bcdSpecRevision=%x\n", __le16_to_cpu(desc->bcdSpecRevision));
+ dev_dbg(dev, "bmDataSize=%x\n", desc->bmDataSize);
+ dev_dbg(dev, "bmWindowSize=%x\n", desc->bmWindowSize);
+ dev_dbg(dev, "bmMinTurnaroundTime=%d\n", desc->bmMinTurnaroundTime);
+ dev_dbg(dev, "wBaudRate=%x\n", __le16_to_cpu(desc->wBaudRate));
+ dev_dbg(dev, "bmAdditionalBOFs=%x\n", desc->bmAdditionalBOFs);
+ dev_dbg(dev, "bIrdaRateSniff=%x\n", desc->bIrdaRateSniff);
+ dev_dbg(dev, "bMaxUnicastList=%x\n", 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_serial *serial, unsigned int ifnum)
+{
+ struct usb_device *dev = serial->dev;
+ 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);
+
+ dev_dbg(&serial->dev->dev, "%s - ret=%d\n", __func__, ret);
+ if (ret < (int)sizeof(*desc)) {
+ dev_dbg(&serial->dev->dev,
+ "%s - class descriptor read %s (%d)\n", __func__,
+ (ret < 0) ? "failed" : "too short", ret);
+ goto error;
+ }
+ if (desc->bDescriptorType != USB_DT_CS_IRDA) {
+ dev_dbg(&serial->dev->dev, "%s - bad class descriptor type\n",
+ __func__);
+ goto error;
+ }
+
+ irda_usb_dump_class_desc(serial, 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;
+ int rates;
+
+ irda_desc = irda_usb_find_class_desc(serial, 0);
+ if (!irda_desc) {
+ dev_err(&serial->dev->dev,
+ "IRDA class descriptor not found, device not bound\n");
+ return -ENODEV;
+ }
+
+ rates = le16_to_cpu(irda_desc->wBaudRate);
+
+ dev_dbg(&serial->dev->dev,
+ "%s - Baud rates supported:%s%s%s%s%s%s%s%s%s\n",
+ __func__,
+ (rates & USB_IRDA_BR_2400) ? " 2400" : "",
+ (rates & USB_IRDA_BR_9600) ? " 9600" : "",
+ (rates & USB_IRDA_BR_19200) ? " 19200" : "",
+ (rates & USB_IRDA_BR_38400) ? " 38400" : "",
+ (rates & USB_IRDA_BR_57600) ? " 57600" : "",
+ (rates & USB_IRDA_BR_115200) ? " 115200" : "",
+ (rates & USB_IRDA_BR_576000) ? " 576000" : "",
+ (rates & USB_IRDA_BR_1152000) ? " 1152000" : "",
+ (rates & 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)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i)
+ port->write_urbs[i]->transfer_flags = URB_ZERO_PACKET;
+
+ /* Start reading from the device */
+ return usb_serial_generic_open(tty, port);
+}
+
+static int ir_prepare_write_buffer(struct usb_serial_port *port,
+ void *dest, size_t size)
+{
+ unsigned char *buf = dest;
+ int count;
+
+ /*
+ * 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.
+ */
+ *buf = ir_xbof | ir_baud;
+
+ count = kfifo_out_locked(&port->write_fifo, buf + 1, size - 1,
+ &port->lock);
+ return count + 1;
+}
+
+static void ir_process_read_urb(struct urb *urb)
+{
+ struct usb_serial_port *port = urb->context;
+ unsigned char *data = urb->transfer_buffer;
+
+ if (!urb->actual_length)
+ return;
+ /*
+ * 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)
+ ir_baud = *data & 0x0f;
+
+ if (urb->actual_length == 1)
+ return;
+
+ tty_insert_flip_string(&port->port, data + 1, urb->actual_length - 1);
+ tty_flip_buffer_push(&port->port);
+}
+
+static void ir_set_termios_callback(struct urb *urb)
+{
+ kfree(urb->transfer_buffer);
+
+ if (urb->status)
+ dev_dbg(&urb->dev->dev, "%s - non-zero urb status: %d\n",
+ __func__, urb->status);
+}
+
+static void ir_set_termios(struct tty_struct *tty,
+ struct usb_serial_port *port, struct ktermios *old_termios)
+{
+ struct urb *urb;
+ unsigned char *transfer_buffer;
+ int result;
+ speed_t baud;
+ int ir_baud;
+
+ 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) ;
+
+ /* Only speed changes are supported */
+ tty_termios_copy_hw(&tty->termios, old_termios);
+ tty_encode_baud_rate(tty, baud, baud);
+
+ /*
+ * send the baud change out on an "empty" data packet
+ */
+ urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (!urb)
+ return;
+
+ transfer_buffer = kmalloc(1, GFP_KERNEL);
+ if (!transfer_buffer)
+ goto err_buf;
+
+ *transfer_buffer = ir_xbof | ir_baud;
+
+ usb_fill_bulk_urb(
+ urb,
+ port->serial->dev,
+ usb_sndbulkpipe(port->serial->dev,
+ port->bulk_out_endpointAddress),
+ transfer_buffer,
+ 1,
+ ir_set_termios_callback,
+ port);
+
+ urb->transfer_flags = URB_ZERO_PACKET;
+
+ result = usb_submit_urb(urb, GFP_KERNEL);
+ if (result) {
+ dev_err(&port->dev, "%s - failed to submit urb: %d\n",
+ __func__, result);
+ goto err_subm;
+ }
+
+ usb_free_urb(urb);
+
+ return;
+err_subm:
+ kfree(transfer_buffer);
+err_buf:
+ usb_free_urb(urb);
+}
+
+static int __init ir_init(void)
+{
+ if (buffer_size) {
+ ir_device.bulk_in_size = buffer_size;
+ ir_device.bulk_out_size = buffer_size;
+ }
+
+ return usb_serial_register_drivers(serial_drivers, KBUILD_MODNAME, ir_id_table);
+}
+
+static void __exit ir_exit(void)
+{
+ usb_serial_deregister_drivers(serial_drivers);
+}
+
+
+module_init(ir_init);
+module_exit(ir_exit);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
+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");
+