1 // SPDX-License-Identifier: GPL-2.0-or-later
5  * serial_ir - Device driver that records pulse- and pause-lengths
6  *	       (space-lengths) between DDCD event on a serial port.
8  * Copyright (C) 1996,97 Ralph Metzler <rjkm@thp.uni-koeln.de>
13  * Copyright (C) 2016 Sean Young <sean@mess.org> (port to rc-core)
28 #include <media/rc-core.h>
37 	void (*send_pulse)(unsigned int length, ktime_t edge);
56 static int sense = -1;	/* -1 = auto, 0 = active high, 1 = active low */
60 static void send_pulse_irdeo(unsigned int length, ktime_t edge);
63 static void send_pulse_homebrew(unsigned int length, ktime_t edge);
141 /* fetch serial input packet (1 byte) from register offset */
142 static u8 sinp(int offset)  in sinp()  argument
145 		/* the register is memory-mapped */  in sinp()
146 		offset <<= ioshift;  in sinp()
148 	return inb(io + offset);  in sinp()
151 /* write serial output packet (1 byte) of value to register offset */
152 static void soutp(int offset, u8 value)  in soutp()  argument
155 		/* the register is memory-mapped */  in soutp()
156 		offset <<= ioshift;  in soutp()
158 	outb(value, io + offset);  in soutp()
190 	for (i = 0, output = 0x7f; rawbits > 0; rawbits -= 3) {  in send_pulse_irdeo()
215 static void send_pulse_homebrew_softcarrier(unsigned int length, ktime_t edge)  in send_pulse_homebrew_softcarrier()  argument
217 	ktime_t now, target = ktime_add_us(edge, length);  in send_pulse_homebrew_softcarrier()
228 	space = DIV_ROUND_CLOSEST((100 - serial_ir.duty_cycle) *  in send_pulse_homebrew_softcarrier()
236 		edge = ktime_add_ns(edge, pulse);  in send_pulse_homebrew_softcarrier()
237 		delta = ktime_to_ns(ktime_sub(edge, now));  in send_pulse_homebrew_softcarrier()
244 		edge = ktime_add_ns(edge, space);  in send_pulse_homebrew_softcarrier()
245 		delta = ktime_to_ns(ktime_sub(edge, now));  in send_pulse_homebrew_softcarrier()
251 static void send_pulse_homebrew(unsigned int length, ktime_t edge)  in send_pulse_homebrew()  argument
254 		send_pulse_homebrew_softcarrier(length, edge);  in send_pulse_homebrew()
327 	static int last_dcd = -1;  in serial_ir_irq_handler()
339 			dev_err(&serial_ir.pdev->dev, "Trapped in interrupt");  in serial_ir_irq_handler()
343 		    sense != -1) {  in serial_ir_irq_handler()
357 				dev_dbg(&serial_ir.pdev->dev,  in serial_ir_irq_handler()
369 					dev_err(&serial_ir.pdev->dev,  in serial_ir_irq_handler()
389 		  jiffies + usecs_to_jiffies(serial_ir.rcdev->timeout));  in serial_ir_irq_handler()
419 		return -ENODEV;  in hardware_init_port()
470 		.duration = serial_ir.rcdev->timeout  in serial_ir_timeout()
489 	rcdev = devm_rc_allocate_device(&dev->dev, RC_DRIVER_IR_RAW);  in serial_ir_probe()
491 		return -ENOMEM;  in serial_ir_probe()
494 		rcdev->tx_ir = serial_ir_tx;  in serial_ir_probe()
496 		rcdev->s_tx_carrier = serial_ir_tx_carrier;  in serial_ir_probe()
498 		rcdev->s_tx_duty_cycle = serial_ir_tx_duty_cycle;  in serial_ir_probe()
502 		rcdev->device_name = "Serial IR type home-brew";  in serial_ir_probe()
505 		rcdev->device_name = "Serial IR type IRdeo";  in serial_ir_probe()
508 		rcdev->device_name = "Serial IR type IRdeo remote";  in serial_ir_probe()
511 		rcdev->device_name = "Serial IR type AnimaX";  in serial_ir_probe()
514 		rcdev->device_name = "Serial IR type IgorPlug";  in serial_ir_probe()
518 	rcdev->input_phys = KBUILD_MODNAME "/input0";  in serial_ir_probe()
519 	rcdev->input_id.bustype = BUS_HOST;  in serial_ir_probe()
520 	rcdev->input_id.vendor = 0x0001;  in serial_ir_probe()
521 	rcdev->input_id.product = 0x0001;  in serial_ir_probe()
522 	rcdev->input_id.version = 0x0100;  in serial_ir_probe()
523 	rcdev->open = serial_ir_open;  in serial_ir_probe()
524 	rcdev->close = serial_ir_close;  in serial_ir_probe()
525 	rcdev->dev.parent = &serial_ir.pdev->dev;  in serial_ir_probe()
526 	rcdev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;  in serial_ir_probe()
527 	rcdev->driver_name = KBUILD_MODNAME;  in serial_ir_probe()
528 	rcdev->map_name = RC_MAP_RC6_MCE;  in serial_ir_probe()
529 	rcdev->min_timeout = 1;  in serial_ir_probe()
530 	rcdev->timeout = IR_DEFAULT_TIMEOUT;  in serial_ir_probe()
531 	rcdev->max_timeout = 10 * IR_DEFAULT_TIMEOUT;  in serial_ir_probe()
532 	rcdev->rx_resolution = 250;  in serial_ir_probe()
538 	result = devm_request_irq(&dev->dev, irq, serial_ir_irq_handler,  in serial_ir_probe()
542 		if (result == -EBUSY)  in serial_ir_probe()
543 			dev_err(&dev->dev, "IRQ %d busy\n", irq);  in serial_ir_probe()
544 		else if (result == -EINVAL)  in serial_ir_probe()
545 			dev_err(&dev->dev, "Bad irq number or handler\n");  in serial_ir_probe()
551 	     (devm_request_mem_region(&dev->dev, iommap, 8UL << ioshift,  in serial_ir_probe()
553 	     (!iommap && (devm_request_region(&dev->dev, io, 8,  in serial_ir_probe()
555 		dev_err(&dev->dev, "port %04x already in use\n", io);  in serial_ir_probe()
556 		dev_warn(&dev->dev, "use 'setserial /dev/ttySX uart none'\n");  in serial_ir_probe()
557 		dev_warn(&dev->dev,  in serial_ir_probe()
559 		dev_warn(&dev->dev, "make sure this module is loaded first\n");  in serial_ir_probe()
560 		return -EBUSY;  in serial_ir_probe()
572 	if (sense == -1) {  in serial_ir_probe()
590 		dev_info(&dev->dev, "auto-detected active %s receiver\n",  in serial_ir_probe()
593 		dev_info(&dev->dev, "Manually using active %s receiver\n",  in serial_ir_probe()
596 	dev_dbg(&dev->dev, "Interrupt %d, port %04x obtained\n", irq, io);  in serial_ir_probe()
598 	return devm_rc_register_device(&dev->dev, rcdev);  in serial_ir_probe()
639 	ktime_t edge;  in serial_ir_tx()  local
649 	edge = ktime_get();  in serial_ir_tx()
654 			hardware[type].send_pulse(txbuf[i], edge);  in serial_ir_tx()
656 		edge = ktime_add_us(edge, txbuf[i]);  in serial_ir_tx()
657 		delta = ktime_us_delta(edge, ktime_get());  in serial_ir_tx()
660 			usleep_range(delta - 25, delta + 25);  in serial_ir_tx()
680 		return -EINVAL;  in serial_ir_tx_carrier()
744 		result = -ENOMEM;  in serial_ir_init()
780 		return -EINVAL;  in serial_ir_init_module()
792 	/* make sure sense is either -1, 0, or 1 */  in serial_ir_init_module()
793 	if (sense != -1)  in serial_ir_init_module()
808 MODULE_DESCRIPTION("Infra-red receiver driver for serial ports.");
813 MODULE_PARM_DESC(type, "Hardware type (0 = home-brew, 1 = IRdeo, 2 = IRdeo Remote, 3 = AnimaX, 4 = …
825  * See linux-kernel/drivers/tty/serial/8250/8250.c serial_in()/out()
828 MODULE_PARM_DESC(ioshift, "shift I/O register offset (0 = no shift)");