// SPDX-License-Identifier: GPL-2.0-or-later/* * IgorPlug-USB IR Receiver * * Copyright (C) 2014 Sean Young <sean@mess.org> * * Supports the standard homebrew IgorPlugUSB receiver with Igor's firmware. * See http://www.cesko.host.sk/IgorPlugUSB/IgorPlug-USB%20(AVR)_eng.htm * * Based on the lirc_igorplugusb.c driver: *	Copyright (C) 2004 Jan M. Hochstein *	<hochstein@algo.informatik.tu-darmstadt.de> */#include <linux/device.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/usb.h>#include <linux/usb/input.h>#include <media/rc-core.h> #define DRIVER_DESC		"IgorPlug-USB IR Receiver"#define DRIVER_NAME		"igorplugusb" #define HEADERLEN		3#define BUFLEN			36#define MAX_PACKET		(HEADERLEN + BUFLEN) #define SET_INFRABUFFER_EMPTY	1#define GET_INFRACODE		2  struct igorplugusb {	struct rc_dev *rc;	struct device *dev; 	struct urb *urb;	struct usb_ctrlrequest *request; 	struct timer_list timer; 	u8 *buf_in; 	char phys[64];}; static void igorplugusb_cmd(struct igorplugusb *ir, int cmd); static void igorplugusb_irdata(struct igorplugusb *ir, unsigned len){	struct ir_raw_event rawir = {};	unsigned i, start, overflow; 	dev_dbg(ir->dev, "irdata: %*ph (len=%u)", len, ir->buf_in, len); 	/*	 * If more than 36 pulses and spaces follow each other, the igorplugusb	 * overwrites its buffer from the beginning. The overflow value is the	 * last offset which was not overwritten. Everything from this offset	 * onwards occurred before everything until this offset.	 */	overflow = ir->buf_in[2];	i = start = overflow + HEADERLEN; 	if (start >= len) {		dev_err(ir->dev, "receive overflow invalid: %u", overflow);	} else {		if (overflow > 0) {			dev_warn(ir->dev, "receive overflow, at least %u lost",								overflow);			ir_raw_event_overflow(ir->rc);		} 		do {			rawir.duration = ir->buf_in[i] * 85;			rawir.pulse = i & 1; 			ir_raw_event_store_with_filter(ir->rc, &rawir); 			if (++i == len)				i = HEADERLEN;		} while (i != start); 		/* add a trailing space */		rawir.duration = ir->rc->timeout;		rawir.pulse = false;		ir_raw_event_store_with_filter(ir->rc, &rawir); 		ir_raw_event_handle(ir->rc);	} 	igorplugusb_cmd(ir, SET_INFRABUFFER_EMPTY);} static void igorplugusb_callback(struct urb *urb){	struct usb_ctrlrequest *req;	struct igorplugusb *ir = urb->context; 	req = (struct usb_ctrlrequest *)urb->setup_packet; 	switch (urb->status) {	case 0:		if (req->bRequest == GET_INFRACODE &&					urb->actual_length > HEADERLEN)			igorplugusb_irdata(ir, urb->actual_length);		else /* request IR */			mod_timer(&ir->timer, jiffies + msecs_to_jiffies(50));		break;	case -EPROTO:	case -ECONNRESET:	case -ENOENT:	case -ESHUTDOWN:		return;	default:		dev_warn(ir->dev, "Error: urb status = %d\n", urb->status);		igorplugusb_cmd(ir, SET_INFRABUFFER_EMPTY);		break;	}} static void igorplugusb_cmd(struct igorplugusb *ir, int cmd){	int ret; 	ir->request->bRequest = cmd;	ir->urb->transfer_flags = 0;	ret = usb_submit_urb(ir->urb, GFP_ATOMIC);	if (ret && ret != -EPERM)		dev_err(ir->dev, "submit urb failed: %d", ret);} static void igorplugusb_timer(struct timer_list *t){	struct igorplugusb *ir = timer_container_of(ir, t, timer); 	igorplugusb_cmd(ir, GET_INFRACODE);} static int igorplugusb_probe(struct usb_interface *intf,					const struct usb_device_id *id){	struct usb_device *udev;	struct usb_host_interface *idesc;	struct usb_endpoint_descriptor *ep;	struct igorplugusb *ir;	struct rc_dev *rc;	int ret = -ENOMEM; 	udev = interface_to_usbdev(intf);	idesc = intf->cur_altsetting; 	if (idesc->desc.bNumEndpoints != 1) {		dev_err(&intf->dev, "incorrect number of endpoints");		return -ENODEV;	} 	ep = &idesc->endpoint[0].desc;	if (!usb_endpoint_dir_in(ep) || !usb_endpoint_xfer_control(ep)) {		dev_err(&intf->dev, "endpoint incorrect");		return -ENODEV;	} 	ir = devm_kzalloc(&intf->dev, sizeof(*ir), GFP_KERNEL);	if (!ir)		return -ENOMEM; 	ir->request = kzalloc_obj(*ir->request);	if (!ir->request)		goto fail; 	ir->dev = &intf->dev; 	timer_setup(&ir->timer, igorplugusb_timer, 0); 	ir->request->bRequest = GET_INFRACODE;	ir->request->bRequestType = USB_TYPE_VENDOR | USB_DIR_IN;	ir->request->wLength = cpu_to_le16(MAX_PACKET); 	ir->urb = usb_alloc_urb(0, GFP_KERNEL);	if (!ir->urb)		goto fail; 	ir->buf_in = kmalloc(MAX_PACKET, GFP_KERNEL);	if (!ir->buf_in)		goto fail;	usb_fill_control_urb(ir->urb, udev,		usb_rcvctrlpipe(udev, 0), (uint8_t *)ir->request,		ir->buf_in, MAX_PACKET, igorplugusb_callback, ir); 	usb_make_path(udev, ir->phys, sizeof(ir->phys)); 	rc = rc_allocate_device(RC_DRIVER_IR_RAW);	if (!rc)		goto fail; 	rc->device_name = DRIVER_DESC;	rc->input_phys = ir->phys;	usb_to_input_id(udev, &rc->input_id);	rc->dev.parent = &intf->dev;	/*	 * This device can only store 36 pulses + spaces, which is not enough	 * for the NEC protocol and many others.	 */	rc->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER &		~(RC_PROTO_BIT_NEC | RC_PROTO_BIT_NECX | RC_PROTO_BIT_NEC32 |		  RC_PROTO_BIT_RC6_6A_20 | RC_PROTO_BIT_RC6_6A_24 |		  RC_PROTO_BIT_RC6_6A_32 | RC_PROTO_BIT_RC6_MCE |		  RC_PROTO_BIT_SONY20 | RC_PROTO_BIT_SANYO); 	rc->priv = ir;	rc->driver_name = DRIVER_NAME;	rc->map_name = RC_MAP_HAUPPAUGE;	rc->timeout = MS_TO_US(100);	rc->rx_resolution = 85; 	ir->rc = rc;	ret = rc_register_device(rc);	if (ret) {		dev_err(&intf->dev, "failed to register rc device: %d", ret);		goto fail;	} 	usb_set_intfdata(intf, ir); 	igorplugusb_cmd(ir, SET_INFRABUFFER_EMPTY); 	return 0;fail:	usb_poison_urb(ir->urb);	timer_delete(&ir->timer);	usb_unpoison_urb(ir->urb);	usb_free_urb(ir->urb);	rc_free_device(ir->rc);	kfree(ir->buf_in);	kfree(ir->request); 	return ret;} static void igorplugusb_disconnect(struct usb_interface *intf){	struct igorplugusb *ir = usb_get_intfdata(intf); 	rc_unregister_device(ir->rc);	usb_poison_urb(ir->urb);	timer_delete_sync(&ir->timer);	usb_set_intfdata(intf, NULL);	usb_unpoison_urb(ir->urb);	usb_free_urb(ir->urb);	rc_free_device(ir->rc);	kfree(ir->buf_in);	kfree(ir->request);} static const struct usb_device_id igorplugusb_table[] = {	/* Igor Plug USB (Atmel's Manufact. ID) */	{ USB_DEVICE(0x03eb, 0x0002) },	/* Fit PC2 Infrared Adapter */	{ USB_DEVICE(0x03eb, 0x21fe) },	/* Terminating entry */	{ }}; static struct usb_driver igorplugusb_driver = {	.name =	DRIVER_NAME,	.probe = igorplugusb_probe,	.disconnect = igorplugusb_disconnect,	.id_table = igorplugusb_table}; module_usb_driver(igorplugusb_driver); MODULE_DESCRIPTION(DRIVER_DESC);MODULE_AUTHOR("Sean Young <sean@mess.org>");MODULE_LICENSE("GPL");MODULE_DEVICE_TABLE(usb, igorplugusb_table);