drivers/media/rc/ttusbir.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * TechnoTrend USB IR Receiver
  *
  * Copyright (C) 2012 Sean Young <sean@mess.org>
  */

 #include <linux/module.h>
 #include <linux/usb.h>
 #include <linux/usb/input.h>
 #include <linux/slab.h>
 #include <linux/leds.h>
 #include <media/rc-core.h>

 #define DRIVER_NAME	"ttusbir"
 #define DRIVER_DESC	"TechnoTrend USB IR Receiver"
 /*
  * The Windows driver uses 8 URBS, the original lirc drivers has a
  * configurable amount (2 default, 4 max). This device generates about 125
  * messages per second (!), whether IR is idle or not.
  */
 #define NUM_URBS	4
 #define US_PER_BYTE	62
 #define US_PER_BIT	(US_PER_BYTE / 8)

 struct ttusbir {
 	struct rc_dev *rc;
 	struct device *dev;
 	struct usb_device *udev;

 	struct urb *urb[NUM_URBS];

 	struct led_classdev led;
 	struct urb *bulk_urb;
 	uint8_t bulk_buffer[5];
 	int bulk_out_endp, iso_in_endp;
 	bool led_on, is_led_on;
 	atomic_t led_complete;

 	char phys[64];
 };

 static enum led_brightness ttusbir_brightness_get(struct led_classdev *led_dev)
 {
 	struct ttusbir *tt = container_of(led_dev, struct ttusbir, led);

 	return tt->led_on ? LED_FULL : LED_OFF;
 }

 static void ttusbir_set_led(struct ttusbir *tt)
 {
 	int ret;

 	smp_mb();

 	if (tt->led_on != tt->is_led_on && tt->udev &&
 				atomic_add_unless(&tt->led_complete, 1, 1)) {
 		tt->bulk_buffer[4] = tt->is_led_on = tt->led_on;
 		ret = usb_submit_urb(tt->bulk_urb, GFP_ATOMIC);
 		if (ret) {
 			dev_warn(tt->dev, "failed to submit bulk urb: %d\n",
 									ret);
 			atomic_dec(&tt->led_complete);
 		}
 	}
 }

 static void ttusbir_brightness_set(struct led_classdev *led_dev, enum
 						led_brightness brightness)
 {
 	struct ttusbir *tt = container_of(led_dev, struct ttusbir, led);

 	tt->led_on = brightness != LED_OFF;

 	ttusbir_set_led(tt);
 }

 /*
  * The urb cannot be reused until the urb completes
  */
 static void ttusbir_bulk_complete(struct urb *urb)
 {
 	struct ttusbir *tt = urb->context;

 	atomic_dec(&tt->led_complete);

 	switch (urb->status) {
 	case 0:
 		break;
 	case -ECONNRESET:
 	case -ENOENT:
 	case -ESHUTDOWN:
 		return;
 	case -EPIPE:
 	default:
 		dev_dbg(tt->dev, "Error: urb status = %d\n", urb->status);
 		break;
 	}

 	ttusbir_set_led(tt);
 }

 /*
  * The data is one bit per sample, a set bit signifying silence and samples
  * being MSB first. Bit 0 can contain garbage so take it to be whatever
  * bit 1 is, so we don't have unexpected edges.
  */
 static void ttusbir_process_ir_data(struct ttusbir *tt, uint8_t *buf)
 {
 	struct ir_raw_event rawir = {};
 	unsigned i, v, b;
 	bool event = false;

 	for (i = 0; i < 128; i++) {
 		v = buf[i] & 0xfe;
 		switch (v) {
 		case 0xfe:
 			rawir.pulse = false;
 			rawir.duration = US_PER_BYTE;
 			if (ir_raw_event_store_with_filter(tt->rc, &rawir))
 				event = true;
 			break;
 		case 0:
 			rawir.pulse = true;
 			rawir.duration = US_PER_BYTE;
 			if (ir_raw_event_store_with_filter(tt->rc, &rawir))
 				event = true;
 			break;
 		default:
 			/* one edge per byte */
 			if (v & 2) {
 				b = ffz(v | 1);
 				rawir.pulse = true;
 			} else {
 				b = ffs(v) - 1;
 				rawir.pulse = false;
 			}

 			rawir.duration = US_PER_BIT * (8 - b);
 			if (ir_raw_event_store_with_filter(tt->rc, &rawir))
 				event = true;

 			rawir.pulse = !rawir.pulse;
 			rawir.duration = US_PER_BIT * b;
 			if (ir_raw_event_store_with_filter(tt->rc, &rawir))
 				event = true;
 			break;
 		}
 	}

 	/* don't wakeup when there's nothing to do */
 	if (event)
 		ir_raw_event_handle(tt->rc);
 }

 static void ttusbir_urb_complete(struct urb *urb)
 {
 	struct ttusbir *tt = urb->context;
 	int rc;

 	switch (urb->status) {
 	case 0:
 		ttusbir_process_ir_data(tt, urb->transfer_buffer);
 		break;
 	case -ECONNRESET:
 	case -ENOENT:
 	case -ESHUTDOWN:
 		return;
 	case -EPIPE:
 	default:
 		dev_dbg(tt->dev, "Error: urb status = %d\n", urb->status);
 		break;
 	}

 	rc = usb_submit_urb(urb, GFP_ATOMIC);
 	if (rc && rc != -ENODEV)
 		dev_warn(tt->dev, "failed to resubmit urb: %d\n", rc);
 }

 static int ttusbir_probe(struct usb_interface *intf,
 			 const struct usb_device_id *id)
 {
 	struct ttusbir *tt;
 	struct usb_interface_descriptor *idesc;
 	struct usb_endpoint_descriptor *desc;
 	struct rc_dev *rc;
 	int i, j, ret;
 	int altsetting = -1;

 	tt = kzalloc(sizeof(*tt), GFP_KERNEL);
 	rc = rc_allocate_device(RC_DRIVER_IR_RAW);
 	if (!tt || !rc) {
 		ret = -ENOMEM;
 		goto out;
 	}

 	/* find the correct alt setting */
 	for (i = 0; i < intf->num_altsetting && altsetting == -1; i++) {
 		int max_packet, bulk_out_endp = -1, iso_in_endp = -1;

 		idesc = &intf->altsetting[i].desc;

 		for (j = 0; j < idesc->bNumEndpoints; j++) {
 			desc = &intf->altsetting[i].endpoint[j].desc;
 			max_packet = le16_to_cpu(desc->wMaxPacketSize);
 			if (usb_endpoint_dir_in(desc) &&
 					usb_endpoint_xfer_isoc(desc) &&
 					max_packet == 0x10)
 				iso_in_endp = j;
 			else if (usb_endpoint_dir_out(desc) &&
 					usb_endpoint_xfer_bulk(desc) &&
 					max_packet == 0x20)
 				bulk_out_endp = j;

 			if (bulk_out_endp != -1 && iso_in_endp != -1) {
 				tt->bulk_out_endp = bulk_out_endp;
 				tt->iso_in_endp = iso_in_endp;
 				altsetting = i;
 				break;
 			}
 		}
 	}

 	if (altsetting == -1) {
 		dev_err(&intf->dev, "cannot find expected altsetting\n");
 		ret = -ENODEV;
 		goto out;
 	}

 	tt->dev = &intf->dev;
 	tt->udev = interface_to_usbdev(intf);
 	tt->rc = rc;

 	ret = usb_set_interface(tt->udev, 0, altsetting);
 	if (ret)
 		goto out;

 	for (i = 0; i < NUM_URBS; i++) {
 		struct urb *urb = usb_alloc_urb(8, GFP_KERNEL);
 		void *buffer;

 		if (!urb) {
 			ret = -ENOMEM;
 			goto out;
 		}

 		urb->dev = tt->udev;
 		urb->context = tt;
 		urb->pipe = usb_rcvisocpipe(tt->udev, tt->iso_in_endp);
 		urb->interval = 1;
 		buffer = usb_alloc_coherent(tt->udev, 128, GFP_KERNEL,
 						&urb->transfer_dma);
 		if (!buffer) {
 			usb_free_urb(urb);
 			ret = -ENOMEM;
 			goto out;
 		}
 		urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP | URB_ISO_ASAP;
 		urb->transfer_buffer = buffer;
 		urb->complete = ttusbir_urb_complete;
 		urb->number_of_packets = 8;
 		urb->transfer_buffer_length = 128;

 		for (j = 0; j < 8; j++) {
 			urb->iso_frame_desc[j].offset = j * 16;
 			urb->iso_frame_desc[j].length = 16;
 		}

 		tt->urb[i] = urb;
 	}

 	tt->bulk_urb = usb_alloc_urb(0, GFP_KERNEL);
 	if (!tt->bulk_urb) {
 		ret = -ENOMEM;
 		goto out;
 	}

 	tt->bulk_buffer[0] = 0xaa;
 	tt->bulk_buffer[1] = 0x01;
 	tt->bulk_buffer[2] = 0x05;
 	tt->bulk_buffer[3] = 0x01;

 	usb_fill_bulk_urb(tt->bulk_urb, tt->udev, usb_sndbulkpipe(tt->udev,
 		tt->bulk_out_endp), tt->bulk_buffer, sizeof(tt->bulk_buffer),
 						ttusbir_bulk_complete, tt);

 	tt->led.name = "ttusbir:green:power";
 	tt->led.default_trigger = "rc-feedback";
 	tt->led.brightness_set = ttusbir_brightness_set;
 	tt->led.brightness_get = ttusbir_brightness_get;
 	tt->is_led_on = tt->led_on = true;
 	atomic_set(&tt->led_complete, 0);
 	ret = led_classdev_register(&intf->dev, &tt->led);
 	if (ret)
 		goto out;

 	usb_make_path(tt->udev, tt->phys, sizeof(tt->phys));

 	rc->device_name = DRIVER_DESC;
 	rc->input_phys = tt->phys;
 	usb_to_input_id(tt->udev, &rc->input_id);
 	rc->dev.parent = &intf->dev;
 	rc->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
 	rc->priv = tt;
 	rc->driver_name = DRIVER_NAME;
 	rc->map_name = RC_MAP_TT_1500;
 	rc->min_timeout = 1;
 	rc->timeout = IR_DEFAULT_TIMEOUT;
 	rc->max_timeout = 10 * IR_DEFAULT_TIMEOUT;

 	/*
 	 * The precision is US_PER_BIT, but since every 8th bit can be
 	 * overwritten with garbage the accuracy is at best 2 * US_PER_BIT.
 	 */
 	rc->rx_resolution = 2 * US_PER_BIT;

 	ret = rc_register_device(rc);
 	if (ret) {
 		dev_err(&intf->dev, "failed to register rc device %d\n", ret);
 		goto out2;
 	}

 	usb_set_intfdata(intf, tt);

 	for (i = 0; i < NUM_URBS; i++) {
 		ret = usb_submit_urb(tt->urb[i], GFP_KERNEL);
 		if (ret) {
 			dev_err(tt->dev, "failed to submit urb %d\n", ret);
 			goto out3;
 		}
 	}

 	return 0;
 out3:
 	rc_unregister_device(rc);
 	rc = NULL;
 out2:
 	led_classdev_unregister(&tt->led);
 out:
 	if (tt) {
 		for (i = 0; i < NUM_URBS && tt->urb[i]; i++) {
 			struct urb *urb = tt->urb[i];

 			usb_kill_urb(urb);
 			usb_free_coherent(tt->udev, 128, urb->transfer_buffer,
 							urb->transfer_dma);
 			usb_free_urb(urb);
 		}
 		usb_kill_urb(tt->bulk_urb);
 		usb_free_urb(tt->bulk_urb);
 		kfree(tt);
 	}
 	rc_free_device(rc);

 	return ret;
 }

 static void ttusbir_disconnect(struct usb_interface *intf)
 {
 	struct ttusbir *tt = usb_get_intfdata(intf);
 	struct usb_device *udev = tt->udev;
 	int i;

 	tt->udev = NULL;

 	rc_unregister_device(tt->rc);
 	led_classdev_unregister(&tt->led);
 	for (i = 0; i < NUM_URBS; i++) {
 		usb_kill_urb(tt->urb[i]);
 		usb_free_coherent(udev, 128, tt->urb[i]->transfer_buffer,
 						tt->urb[i]->transfer_dma);
 		usb_free_urb(tt->urb[i]);
 	}
 	usb_kill_urb(tt->bulk_urb);
 	usb_free_urb(tt->bulk_urb);
 	usb_set_intfdata(intf, NULL);
 	kfree(tt);
 }

 static int ttusbir_suspend(struct usb_interface *intf, pm_message_t message)
 {
 	struct ttusbir *tt = usb_get_intfdata(intf);
 	int i;

 	for (i = 0; i < NUM_URBS; i++)
 		usb_kill_urb(tt->urb[i]);

 	led_classdev_suspend(&tt->led);
 	usb_kill_urb(tt->bulk_urb);

 	return 0;
 }

 static int ttusbir_resume(struct usb_interface *intf)
 {
 	struct ttusbir *tt = usb_get_intfdata(intf);
 	int i, rc;

 	tt->is_led_on = true;
 	led_classdev_resume(&tt->led);

 	for (i = 0; i < NUM_URBS; i++) {
 		rc = usb_submit_urb(tt->urb[i], GFP_NOIO);
 		if (rc) {
 			dev_warn(tt->dev, "failed to submit urb: %d\n", rc);
 			break;
 		}
 	}

 	return rc;
 }

 static const struct usb_device_id ttusbir_table[] = {
 	{ USB_DEVICE(0x0b48, 0x2003) },
 	{ }
 };

 static struct usb_driver ttusbir_driver = {
 	.name = DRIVER_NAME,
 	.id_table = ttusbir_table,
 	.probe = ttusbir_probe,
 	.suspend = ttusbir_suspend,
 	.resume = ttusbir_resume,
 	.reset_resume = ttusbir_resume,
 	.disconnect = ttusbir_disconnect,
 };

 module_usb_driver(ttusbir_driver);

 MODULE_DESCRIPTION(DRIVER_DESC);
 MODULE_AUTHOR("Sean Young <sean@mess.org>");
 MODULE_LICENSE("GPL");
 MODULE_DEVICE_TABLE(usb, ttusbir_table);
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* TechnoTrend USB IR Receiver
	*
	* Copyright (C) 2012 Sean Young <sean@mess.org>
	*/

	#include <linux/module.h>
	#include <linux/usb.h>
	#include <linux/usb/input.h>
	#include <linux/slab.h>
	#include <linux/leds.h>
	#include <media/rc-core.h>

	#define DRIVER_NAME "ttusbir"
	#define DRIVER_DESC "TechnoTrend USB IR Receiver"
	/*
	* The Windows driver uses 8 URBS, the original lirc drivers has a
	* configurable amount (2 default, 4 max). This device generates about 125
	* messages per second (!), whether IR is idle or not.
	*/
	#define NUM_URBS 4
	#define US_PER_BYTE 62
	#define US_PER_BIT (US_PER_BYTE / 8)

	struct ttusbir {
	struct rc_dev *rc;
	struct device *dev;
	struct usb_device *udev;

	struct urb *urb[NUM_URBS];

	struct led_classdev led;
	struct urb *bulk_urb;
	uint8_t bulk_buffer[5];
	int bulk_out_endp, iso_in_endp;
	bool led_on, is_led_on;
	atomic_t led_complete;

	char phys[64];
	};

	static enum led_brightness ttusbir_brightness_get(struct led_classdev *led_dev)
	{
	struct ttusbir *tt = container_of(led_dev, struct ttusbir, led);

	return tt->led_on ? LED_FULL : LED_OFF;
	}

	static void ttusbir_set_led(struct ttusbir *tt)
	{
	int ret;

	smp_mb();

	if (tt->led_on != tt->is_led_on && tt->udev &&
	atomic_add_unless(&tt->led_complete, 1, 1)) {
	tt->bulk_buffer[4] = tt->is_led_on = tt->led_on;
	ret = usb_submit_urb(tt->bulk_urb, GFP_ATOMIC);
	if (ret) {
	dev_warn(tt->dev, "failed to submit bulk urb: %d\n",
	ret);
	atomic_dec(&tt->led_complete);
	}
	}
	}

	static void ttusbir_brightness_set(struct led_classdev *led_dev, enum
	led_brightness brightness)
	{
	struct ttusbir *tt = container_of(led_dev, struct ttusbir, led);

	tt->led_on = brightness != LED_OFF;

	ttusbir_set_led(tt);
	}

	/*
	* The urb cannot be reused until the urb completes
	*/
	static void ttusbir_bulk_complete(struct urb *urb)
	{
	struct ttusbir *tt = urb->context;

	atomic_dec(&tt->led_complete);

	switch (urb->status) {
	case 0:
	break;
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
	return;
	case -EPIPE:
	default:
	dev_dbg(tt->dev, "Error: urb status = %d\n", urb->status);
	break;
	}

	ttusbir_set_led(tt);
	}

	/*
	* The data is one bit per sample, a set bit signifying silence and samples
	* being MSB first. Bit 0 can contain garbage so take it to be whatever
	* bit 1 is, so we don't have unexpected edges.
	*/
	static void ttusbir_process_ir_data(struct ttusbir tt, uint8_t buf)
	{
	struct ir_raw_event rawir = {};
	unsigned i, v, b;
	bool event = false;

	for (i = 0; i < 128; i++) {
	v = buf[i] & 0xfe;
	switch (v) {
	case 0xfe:
	rawir.pulse = false;
	rawir.duration = US_PER_BYTE;
	if (ir_raw_event_store_with_filter(tt->rc, &rawir))
	event = true;
	break;
	case 0:
	rawir.pulse = true;
	rawir.duration = US_PER_BYTE;
	if (ir_raw_event_store_with_filter(tt->rc, &rawir))
	event = true;
	break;
	default:
	/* one edge per byte */
	if (v & 2) {
	b = ffz(v \| 1);
	rawir.pulse = true;
	} else {
	b = ffs(v) - 1;
	rawir.pulse = false;
	}

	rawir.duration = US_PER_BIT * (8 - b);
	if (ir_raw_event_store_with_filter(tt->rc, &rawir))
	event = true;

	rawir.pulse = !rawir.pulse;
	rawir.duration = US_PER_BIT * b;
	if (ir_raw_event_store_with_filter(tt->rc, &rawir))
	event = true;
	break;
	}
	}

	/* don't wakeup when there's nothing to do */
	if (event)
	ir_raw_event_handle(tt->rc);
	}

	static void ttusbir_urb_complete(struct urb *urb)
	{
	struct ttusbir *tt = urb->context;
	int rc;

	switch (urb->status) {
	case 0:
	ttusbir_process_ir_data(tt, urb->transfer_buffer);
	break;
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
	return;
	case -EPIPE:
	default:
	dev_dbg(tt->dev, "Error: urb status = %d\n", urb->status);
	break;
	}

	rc = usb_submit_urb(urb, GFP_ATOMIC);
	if (rc && rc != -ENODEV)
	dev_warn(tt->dev, "failed to resubmit urb: %d\n", rc);
	}

	static int ttusbir_probe(struct usb_interface *intf,
	const struct usb_device_id *id)
	{
	struct ttusbir *tt;
	struct usb_interface_descriptor *idesc;
	struct usb_endpoint_descriptor *desc;
	struct rc_dev *rc;
	int i, j, ret;
	int altsetting = -1;

	tt = kzalloc(sizeof(*tt), GFP_KERNEL);
	rc = rc_allocate_device(RC_DRIVER_IR_RAW);
	if (!tt \|\| !rc) {
	ret = -ENOMEM;
	goto out;
	}

	/* find the correct alt setting */
	for (i = 0; i < intf->num_altsetting && altsetting == -1; i++) {
	int max_packet, bulk_out_endp = -1, iso_in_endp = -1;

	idesc = &intf->altsetting[i].desc;

	for (j = 0; j < idesc->bNumEndpoints; j++) {
	desc = &intf->altsetting[i].endpoint[j].desc;
	max_packet = le16_to_cpu(desc->wMaxPacketSize);
	if (usb_endpoint_dir_in(desc) &&
	usb_endpoint_xfer_isoc(desc) &&
	max_packet == 0x10)
	iso_in_endp = j;
	else if (usb_endpoint_dir_out(desc) &&
	usb_endpoint_xfer_bulk(desc) &&
	max_packet == 0x20)
	bulk_out_endp = j;

	if (bulk_out_endp != -1 && iso_in_endp != -1) {
	tt->bulk_out_endp = bulk_out_endp;
	tt->iso_in_endp = iso_in_endp;
	altsetting = i;
	break;
	}
	}
	}

	if (altsetting == -1) {
	dev_err(&intf->dev, "cannot find expected altsetting\n");
	ret = -ENODEV;
	goto out;
	}

	tt->dev = &intf->dev;
	tt->udev = interface_to_usbdev(intf);
	tt->rc = rc;

	ret = usb_set_interface(tt->udev, 0, altsetting);
	if (ret)
	goto out;

	for (i = 0; i < NUM_URBS; i++) {
	struct urb *urb = usb_alloc_urb(8, GFP_KERNEL);
	void *buffer;

	if (!urb) {
	ret = -ENOMEM;
	goto out;
	}

	urb->dev = tt->udev;
	urb->context = tt;
	urb->pipe = usb_rcvisocpipe(tt->udev, tt->iso_in_endp);
	urb->interval = 1;
	buffer = usb_alloc_coherent(tt->udev, 128, GFP_KERNEL,
	&urb->transfer_dma);
	if (!buffer) {
	usb_free_urb(urb);
	ret = -ENOMEM;
	goto out;
	}
	urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP \| URB_ISO_ASAP;
	urb->transfer_buffer = buffer;
	urb->complete = ttusbir_urb_complete;
	urb->number_of_packets = 8;
	urb->transfer_buffer_length = 128;

	for (j = 0; j < 8; j++) {
	urb->iso_frame_desc[j].offset = j * 16;
	urb->iso_frame_desc[j].length = 16;
	}

	tt->urb[i] = urb;
	}

	tt->bulk_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!tt->bulk_urb) {
	ret = -ENOMEM;
	goto out;
	}

	tt->bulk_buffer[0] = 0xaa;
	tt->bulk_buffer[1] = 0x01;
	tt->bulk_buffer[2] = 0x05;
	tt->bulk_buffer[3] = 0x01;

	usb_fill_bulk_urb(tt->bulk_urb, tt->udev, usb_sndbulkpipe(tt->udev,
	tt->bulk_out_endp), tt->bulk_buffer, sizeof(tt->bulk_buffer),
	ttusbir_bulk_complete, tt);

	tt->led.name = "ttusbir:green:power";
	tt->led.default_trigger = "rc-feedback";
	tt->led.brightness_set = ttusbir_brightness_set;
	tt->led.brightness_get = ttusbir_brightness_get;
	tt->is_led_on = tt->led_on = true;
	atomic_set(&tt->led_complete, 0);
	ret = led_classdev_register(&intf->dev, &tt->led);
	if (ret)
	goto out;

	usb_make_path(tt->udev, tt->phys, sizeof(tt->phys));

	rc->device_name = DRIVER_DESC;
	rc->input_phys = tt->phys;
	usb_to_input_id(tt->udev, &rc->input_id);
	rc->dev.parent = &intf->dev;
	rc->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
	rc->priv = tt;
	rc->driver_name = DRIVER_NAME;
	rc->map_name = RC_MAP_TT_1500;
	rc->min_timeout = 1;
	rc->timeout = IR_DEFAULT_TIMEOUT;
	rc->max_timeout = 10 * IR_DEFAULT_TIMEOUT;

	/*
	* The precision is US_PER_BIT, but since every 8th bit can be
	* overwritten with garbage the accuracy is at best 2 * US_PER_BIT.
	*/
	rc->rx_resolution = 2 * US_PER_BIT;

	ret = rc_register_device(rc);
	if (ret) {
	dev_err(&intf->dev, "failed to register rc device %d\n", ret);
	goto out2;
	}

	usb_set_intfdata(intf, tt);

	for (i = 0; i < NUM_URBS; i++) {
	ret = usb_submit_urb(tt->urb[i], GFP_KERNEL);
	if (ret) {
	dev_err(tt->dev, "failed to submit urb %d\n", ret);
	goto out3;
	}
	}

	return 0;
	out3:
	rc_unregister_device(rc);
	rc = NULL;
	out2:
	led_classdev_unregister(&tt->led);
	out:
	if (tt) {
	for (i = 0; i < NUM_URBS && tt->urb[i]; i++) {
	struct urb *urb = tt->urb[i];

	usb_kill_urb(urb);
	usb_free_coherent(tt->udev, 128, urb->transfer_buffer,
	urb->transfer_dma);
	usb_free_urb(urb);
	}
	usb_kill_urb(tt->bulk_urb);
	usb_free_urb(tt->bulk_urb);
	kfree(tt);
	}
	rc_free_device(rc);

	return ret;
	}

	static void ttusbir_disconnect(struct usb_interface *intf)
	{
	struct ttusbir *tt = usb_get_intfdata(intf);
	struct usb_device *udev = tt->udev;
	int i;

	tt->udev = NULL;

	rc_unregister_device(tt->rc);
	led_classdev_unregister(&tt->led);
	for (i = 0; i < NUM_URBS; i++) {
	usb_kill_urb(tt->urb[i]);
	usb_free_coherent(udev, 128, tt->urb[i]->transfer_buffer,
	tt->urb[i]->transfer_dma);
	usb_free_urb(tt->urb[i]);
	}
	usb_kill_urb(tt->bulk_urb);
	usb_free_urb(tt->bulk_urb);
	usb_set_intfdata(intf, NULL);
	kfree(tt);
	}

	static int ttusbir_suspend(struct usb_interface *intf, pm_message_t message)
	{
	struct ttusbir *tt = usb_get_intfdata(intf);
	int i;

	for (i = 0; i < NUM_URBS; i++)
	usb_kill_urb(tt->urb[i]);

	led_classdev_suspend(&tt->led);
	usb_kill_urb(tt->bulk_urb);

	return 0;
	}

	static int ttusbir_resume(struct usb_interface *intf)
	{
	struct ttusbir *tt = usb_get_intfdata(intf);
	int i, rc;

	tt->is_led_on = true;
	led_classdev_resume(&tt->led);

	for (i = 0; i < NUM_URBS; i++) {
	rc = usb_submit_urb(tt->urb[i], GFP_NOIO);
	if (rc) {
	dev_warn(tt->dev, "failed to submit urb: %d\n", rc);
	break;
	}
	}

	return rc;
	}

	static const struct usb_device_id ttusbir_table[] = {
	{ USB_DEVICE(0x0b48, 0x2003) },
	{ }
	};

	static struct usb_driver ttusbir_driver = {
	.name = DRIVER_NAME,
	.id_table = ttusbir_table,
	.probe = ttusbir_probe,
	.suspend = ttusbir_suspend,
	.resume = ttusbir_resume,
	.reset_resume = ttusbir_resume,
	.disconnect = ttusbir_disconnect,
	};

	module_usb_driver(ttusbir_driver);

	MODULE_DESCRIPTION(DRIVER_DESC);
	MODULE_AUTHOR("Sean Young <sean@mess.org>");
	MODULE_LICENSE("GPL");
	MODULE_DEVICE_TABLE(usb, ttusbir_table);