[mirror_ubuntu-kernels.git] / drivers / media / rc / sir_ir.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * IR SIR driver, (C) 2000 Milan Pikula <www@fornax.sk>
 *
 * sir_ir - Device driver for use with SIR (serial infra red)
 * mode of IrDA on many notebooks.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/serial_reg.h>
#include <linux/ktime.h>
#include <linux/delay.h>
#include <linux/platform_device.h>

#include <media/rc-core.h>

/* SECTION: Definitions */
#define PULSE '['

/* 9bit * 1s/115200bit in milli seconds = 78.125ms*/
#define TIME_CONST (9000000ul / 115200ul)

/* timeout for sequences in jiffies (=5/100s), must be longer than TIME_CONST */
#define SIR_TIMEOUT	(HZ * 5 / 100)

/* onboard sir ports are typically com3 */
static int io = 0x3e8;
static int irq = 4;
static int threshold = 3;

static DEFINE_SPINLOCK(timer_lock);
static struct timer_list timerlist;
/* time of last signal change detected */
static ktime_t last;
/* time of last UART data ready interrupt */
static ktime_t last_intr_time;
static int last_value;
static struct rc_dev *rcdev;

static struct platform_device *sir_ir_dev;

static DEFINE_SPINLOCK(hardware_lock);

/* SECTION: Prototypes */

/* Communication with user-space */
static void add_read_queue(int flag, unsigned long val);
/* Hardware */
static irqreturn_t sir_interrupt(int irq, void *dev_id);
static void send_space(unsigned long len);
static void send_pulse(unsigned long len);
static int init_hardware(void);
static void drop_hardware(void);
/* Initialisation */

static inline unsigned int sinp(int offset)
{
	return inb(io + offset);
}

static inline void soutp(int offset, int value)
{
	outb(value, io + offset);
}

/* SECTION: Communication with user-space */
static int sir_tx_ir(struct rc_dev *dev, unsigned int *tx_buf,
		     unsigned int count)
{
	unsigned long flags;
	int i;

	local_irq_save(flags);
	for (i = 0; i < count;) {
		if (tx_buf[i])
			send_pulse(tx_buf[i]);
		i++;
		if (i >= count)
			break;
		if (tx_buf[i])
			send_space(tx_buf[i]);
		i++;
	}
	local_irq_restore(flags);

	return count;
}

static void add_read_queue(int flag, unsigned long val)
{
	struct ir_raw_event ev = {};

	pr_debug("add flag %d with val %lu\n", flag, val);

	/*
	 * statistically, pulses are ~TIME_CONST/2 too long. we could
	 * maybe make this more exact, but this is good enough
	 */
	if (flag) {
		/* pulse */
		if (val > TIME_CONST / 2)
			val -= TIME_CONST / 2;
		else /* should not ever happen */
			val = 1;
		ev.pulse = true;
	} else {
		val += TIME_CONST / 2;
	}
	ev.duration = US_TO_NS(val);

	ir_raw_event_store_with_filter(rcdev, &ev);
}

/* SECTION: Hardware */
static void sir_timeout(struct timer_list *unused)
{
	/*
	 * if last received signal was a pulse, but receiving stopped
	 * within the 9 bit frame, we need to finish this pulse and
	 * simulate a signal change to from pulse to space. Otherwise
	 * upper layers will receive two sequences next time.
	 */

	unsigned long flags;
	unsigned long pulse_end;

	/* avoid interference with interrupt */
	spin_lock_irqsave(&timer_lock, flags);
	if (last_value) {
		/* clear unread bits in UART and restart */
		outb(UART_FCR_CLEAR_RCVR, io + UART_FCR);
		/* determine 'virtual' pulse end: */
		pulse_end = min_t(unsigned long,
				  ktime_us_delta(last, last_intr_time),
				  IR_MAX_DURATION);
		dev_dbg(&sir_ir_dev->dev, "timeout add %d for %lu usec\n",
			last_value, pulse_end);
		add_read_queue(last_value, pulse_end);
		last_value = 0;
		last = last_intr_time;
	}
	spin_unlock_irqrestore(&timer_lock, flags);
	ir_raw_event_handle(rcdev);
}

static irqreturn_t sir_interrupt(int irq, void *dev_id)
{
	unsigned char data;
	ktime_t curr_time;
	unsigned long delt;
	unsigned long deltintr;
	unsigned long flags;
	int counter = 0;
	int iir, lsr;

	while ((iir = inb(io + UART_IIR) & UART_IIR_ID)) {
		if (++counter > 256) {
			dev_err(&sir_ir_dev->dev, "Trapped in interrupt");
			break;
		}

		switch (iir & UART_IIR_ID) { /* FIXME toto treba preriedit */
		case UART_IIR_MSI:
			(void)inb(io + UART_MSR);
			break;
		case UART_IIR_RLSI:
		case UART_IIR_THRI:
			(void)inb(io + UART_LSR);
			break;
		case UART_IIR_RDI:
			/* avoid interference with timer */
			spin_lock_irqsave(&timer_lock, flags);
			do {
				del_timer(&timerlist);
				data = inb(io + UART_RX);
				curr_time = ktime_get();
				delt = min_t(unsigned long,
					     ktime_us_delta(last, curr_time),
					     IR_MAX_DURATION);
				deltintr = min_t(unsigned long,
						 ktime_us_delta(last_intr_time,
								curr_time),
						 IR_MAX_DURATION);
				dev_dbg(&sir_ir_dev->dev, "t %lu, d %d\n",
					deltintr, (int)data);
				/*
				 * if nothing came in last X cycles,
				 * it was gap
				 */
				if (deltintr > TIME_CONST * threshold) {
					if (last_value) {
						dev_dbg(&sir_ir_dev->dev, "GAP\n");
						/* simulate signal change */
						add_read_queue(last_value,
							       delt -
							       deltintr);
						last_value = 0;
						last = last_intr_time;
						delt = deltintr;
					}
				}
				data = 1;
				if (data ^ last_value) {
					/*
					 * deltintr > 2*TIME_CONST, remember?
					 * the other case is timeout
					 */
					add_read_queue(last_value,
						       delt - TIME_CONST);
					last_value = data;
					last = curr_time;
					last = ktime_sub_us(last,
							    TIME_CONST);
				}
				last_intr_time = curr_time;
				if (data) {
					/*
					 * start timer for end of
					 * sequence detection
					 */
					timerlist.expires = jiffies +
								SIR_TIMEOUT;
					add_timer(&timerlist);
				}

				lsr = inb(io + UART_LSR);
			} while (lsr & UART_LSR_DR); /* data ready */
			spin_unlock_irqrestore(&timer_lock, flags);
			break;
		default:
			break;
		}
	}
	ir_raw_event_handle(rcdev);
	return IRQ_RETVAL(IRQ_HANDLED);
}

static void send_space(unsigned long len)
{
	usleep_range(len, len + 25);
}

static void send_pulse(unsigned long len)
{
	long bytes_out = len / TIME_CONST;

	if (bytes_out == 0)
		bytes_out++;

	while (bytes_out--) {
		outb(PULSE, io + UART_TX);
		/* FIXME treba seriozne cakanie z char/serial.c */
		while (!(inb(io + UART_LSR) & UART_LSR_THRE))
			;
	}
}

static int init_hardware(void)
{
	u8 scratch, scratch2, scratch3;
	unsigned long flags;

	spin_lock_irqsave(&hardware_lock, flags);

	/*
	 * This is a simple port existence test, borrowed from the autoconfig
	 * function in drivers/tty/serial/8250/8250_port.c
	 */
	scratch = sinp(UART_IER);
	soutp(UART_IER, 0);
#ifdef __i386__
	outb(0xff, 0x080);
#endif
	scratch2 = sinp(UART_IER) & 0x0f;
	soutp(UART_IER, 0x0f);
#ifdef __i386__
	outb(0x00, 0x080);
#endif
	scratch3 = sinp(UART_IER) & 0x0f;
	soutp(UART_IER, scratch);
	if (scratch2 != 0 || scratch3 != 0x0f) {
		/* we fail, there's nothing here */
		spin_unlock_irqrestore(&hardware_lock, flags);
		pr_err("port existence test failed, cannot continue\n");
		return -ENODEV;
	}

	/* reset UART */
	outb(0, io + UART_MCR);
	outb(0, io + UART_IER);
	/* init UART */
	/* set DLAB, speed = 115200 */
	outb(UART_LCR_DLAB | UART_LCR_WLEN7, io + UART_LCR);
	outb(1, io + UART_DLL); outb(0, io + UART_DLM);
	/* 7N1+start = 9 bits at 115200 ~ 3 bits at 44000 */
	outb(UART_LCR_WLEN7, io + UART_LCR);
	/* FIFO operation */
	outb(UART_FCR_ENABLE_FIFO, io + UART_FCR);
	/* interrupts */
	/* outb(UART_IER_RLSI|UART_IER_RDI|UART_IER_THRI, io + UART_IER); */
	outb(UART_IER_RDI, io + UART_IER);
	/* turn on UART */
	outb(UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2, io + UART_MCR);
	spin_unlock_irqrestore(&hardware_lock, flags);

	return 0;
}

static void drop_hardware(void)
{
	unsigned long flags;

	spin_lock_irqsave(&hardware_lock, flags);

	/* turn off interrupts */
	outb(0, io + UART_IER);

	spin_unlock_irqrestore(&hardware_lock, flags);
}

/* SECTION: Initialisation */
static int sir_ir_probe(struct platform_device *dev)
{
	int retval;

	rcdev = devm_rc_allocate_device(&sir_ir_dev->dev, RC_DRIVER_IR_RAW);
	if (!rcdev)
		return -ENOMEM;

	rcdev->device_name = "SIR IrDA port";
	rcdev->input_phys = KBUILD_MODNAME "/input0";
	rcdev->input_id.bustype = BUS_HOST;
	rcdev->input_id.vendor = 0x0001;
	rcdev->input_id.product = 0x0001;
	rcdev->input_id.version = 0x0100;
	rcdev->tx_ir = sir_tx_ir;
	rcdev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
	rcdev->driver_name = KBUILD_MODNAME;
	rcdev->map_name = RC_MAP_RC6_MCE;
	rcdev->timeout = IR_DEFAULT_TIMEOUT;
	rcdev->dev.parent = &sir_ir_dev->dev;

	timer_setup(&timerlist, sir_timeout, 0);

	/* get I/O port access and IRQ line */
	if (!devm_request_region(&sir_ir_dev->dev, io, 8, KBUILD_MODNAME)) {
		pr_err("i/o port 0x%.4x already in use.\n", io);
		return -EBUSY;
	}
	retval = devm_request_irq(&sir_ir_dev->dev, irq, sir_interrupt, 0,
				  KBUILD_MODNAME, NULL);
	if (retval < 0) {
		pr_err("IRQ %d already in use.\n", irq);
		return retval;
	}

	retval = init_hardware();
	if (retval) {
		del_timer_sync(&timerlist);
		return retval;
	}

	pr_info("I/O port 0x%.4x, IRQ %d.\n", io, irq);

	retval = devm_rc_register_device(&sir_ir_dev->dev, rcdev);
	if (retval < 0)
		return retval;

	return 0;
}

static int sir_ir_remove(struct platform_device *dev)
{
	drop_hardware();
	del_timer_sync(&timerlist);
	return 0;
}

static struct platform_driver sir_ir_driver = {
	.probe		= sir_ir_probe,
	.remove		= sir_ir_remove,
	.driver		= {
		.name	= "sir_ir",
	},
};

static int __init sir_ir_init(void)
{
	int retval;

	retval = platform_driver_register(&sir_ir_driver);
	if (retval)
		return retval;

	sir_ir_dev = platform_device_alloc("sir_ir", 0);
	if (!sir_ir_dev) {
		retval = -ENOMEM;
		goto pdev_alloc_fail;
	}

	retval = platform_device_add(sir_ir_dev);
	if (retval)
		goto pdev_add_fail;

	return 0;

pdev_add_fail:
	platform_device_put(sir_ir_dev);
pdev_alloc_fail:
	platform_driver_unregister(&sir_ir_driver);
	return retval;
}

static void __exit sir_ir_exit(void)
{
	platform_device_unregister(sir_ir_dev);
	platform_driver_unregister(&sir_ir_driver);
}

module_init(sir_ir_init);
module_exit(sir_ir_exit);

MODULE_DESCRIPTION("Infrared receiver driver for SIR type serial ports");
MODULE_AUTHOR("Milan Pikula");
MODULE_LICENSE("GPL");

module_param_hw(io, int, ioport, 0444);
MODULE_PARM_DESC(io, "I/O address base (0x3f8 or 0x2f8)");

module_param_hw(irq, int, irq, 0444);
MODULE_PARM_DESC(irq, "Interrupt (4 or 3)");

module_param(threshold, int, 0444);
MODULE_PARM_DESC(threshold, "space detection threshold (3)");
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
404f3e95	2	/*
402e7b63	3	* IR SIR driver, (C) 2000 Milan Pikula <www@fornax.sk>
404f3e95	4	*
cc06393a	5	* sir_ir - Device driver for use with SIR (serial infra red)
404f3e95	6	* mode of IrDA on many notebooks.
404f3e95 JW	7	*/
404f3e95 JW	8
014f0066 YT	9	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
014f0066 YT	10
404f3e95	11	#include <linux/module.h>
404f3e95	12	#include <linux/interrupt.h>
404f3e95 JW	13	#include <linux/kernel.h>
404f3e95 JW	14	#include <linux/serial_reg.h>
34668350	15	#include <linux/ktime.h>
404f3e95	16	#include <linux/delay.h>
4b71ca6b	17	#include <linux/platform_device.h>
404f3e95	18
cc06393a	19	#include <media/rc-core.h>
404f3e95 JW	20
404f3e95 JW	21	/* SECTION: Definitions */
404f3e95 JW	22	#define PULSE '['
404f3e95 JW	23
404f3e95	24	/* 9bit * 1s/115200bit in milli seconds = 78.125ms*/
43371f6b	25	#define TIME_CONST (9000000ul / 115200ul)
404f3e95 JW	26
404f3e95 JW	27	/* timeout for sequences in jiffies (=5/100s), must be longer than TIME_CONST */
43371f6b	28	#define SIR_TIMEOUT (HZ * 5 / 100)
404f3e95	29
404f3e95	30	/* onboard sir ports are typically com3 */
402e7b63 SY	31	static int io = 0x3e8;
402e7b63 SY	32	static int irq = 4;
404f3e95	33	static int threshold = 3;
404f3e95 JW	34
	35	static DEFINE_SPINLOCK(timer_lock);
	36	static struct timer_list timerlist;
	37	/* time of last signal change detected */
34668350	38	static ktime_t last;
404f3e95	39	/* time of last UART data ready interrupt */
34668350	40	static ktime_t last_intr_time;
404f3e95	41	static int last_value;
cc06393a	42	static struct rc_dev *rcdev;
404f3e95	43
cc06393a	44	static struct platform_device *sir_ir_dev;
404f3e95 JW	45
	46	static DEFINE_SPINLOCK(hardware_lock);
	47
404f3e95 JW	48	/* SECTION: Prototypes */
	49
	50	/* Communication with user-space */
404f3e95	51	static void add_read_queue(int flag, unsigned long val);
404f3e95 JW	52	/* Hardware */
	53	static irqreturn_t sir_interrupt(int irq, void *dev_id);
	54	static void send_space(unsigned long len);
	55	static void send_pulse(unsigned long len);
30b4e122	56	static int init_hardware(void);
404f3e95 JW	57	static void drop_hardware(void);
404f3e95 JW	58	/* Initialisation */
404f3e95	59
404f3e95 JW	60	static inline unsigned int sinp(int offset)
	61	{
	62	return inb(io + offset);
	63	}
	64
	65	static inline void soutp(int offset, int value)
	66	{
	67	outb(value, io + offset);
	68	}
404f3e95	69
404f3e95	70	/* SECTION: Communication with user-space */
cc06393a SY	71	static int sir_tx_ir(struct rc_dev dev, unsigned int tx_buf,
cc06393a SY	72	unsigned int count)
404f3e95 JW	73	{
404f3e95 JW	74	unsigned long flags;
cc06393a SY	75	int i;
cc06393a SY	76
404f3e95	77	local_irq_save(flags);
cc06393a	78	for (i = 0; i < count;) {
404f3e95 JW	79	if (tx_buf[i])
	80	send_pulse(tx_buf[i]);
	81	i++;
	82	if (i >= count)
	83	break;
	84	if (tx_buf[i])
	85	send_space(tx_buf[i]);
	86	i++;
	87	}
	88	local_irq_restore(flags);
404f3e95	89
cc06393a	90	return count;
404f3e95 JW	91	}
	92
	93	static void add_read_queue(int flag, unsigned long val)
	94	{
183e19f5	95	struct ir_raw_event ev = {};
404f3e95	96
c96bf1d6	97	pr_debug("add flag %d with val %lu\n", flag, val);
404f3e95	98
404f3e95 JW	99	/*
	100	* statistically, pulses are ~TIME_CONST/2 too long. we could
	101	* maybe make this more exact, but this is good enough
	102	*/
	103	if (flag) {
	104	/* pulse */
cc06393a SY	105	if (val > TIME_CONST / 2)
cc06393a SY	106	val -= TIME_CONST / 2;
404f3e95	107	else /* should not ever happen */
cc06393a SY	108	val = 1;
cc06393a SY	109	ev.pulse = true;
404f3e95	110	} else {
cc06393a	111	val += TIME_CONST / 2;
404f3e95	112	}
cc06393a	113	ev.duration = US_TO_NS(val);
404f3e95	114
cc06393a	115	ir_raw_event_store_with_filter(rcdev, &ev);
404f3e95 JW	116	}
404f3e95 JW	117
404f3e95	118	/* SECTION: Hardware */
b17ec78a	119	static void sir_timeout(struct timer_list *unused)
404f3e95 JW	120	{
	121	/*
	122	* if last received signal was a pulse, but receiving stopped
	123	* within the 9 bit frame, we need to finish this pulse and
	124	* simulate a signal change to from pulse to space. Otherwise
	125	* upper layers will receive two sequences next time.
	126	*/
	127
	128	unsigned long flags;
	129	unsigned long pulse_end;
	130
	131	/* avoid interference with interrupt */
	132	spin_lock_irqsave(&timer_lock, flags);
	133	if (last_value) {
404f3e95 JW	134	/* clear unread bits in UART and restart */
404f3e95 JW	135	outb(UART_FCR_CLEAR_RCVR, io + UART_FCR);
404f3e95	136	/* determine 'virtual' pulse end: */
34668350 KS	137	pulse_end = min_t(unsigned long,
34668350 KS	138	ktime_us_delta(last, last_intr_time),
cc06393a SY	139	IR_MAX_DURATION);
	140	dev_dbg(&sir_ir_dev->dev, "timeout add %d for %lu usec\n",
	141	last_value, pulse_end);
404f3e95 JW	142	add_read_queue(last_value, pulse_end);
404f3e95 JW	143	last_value = 0;
34668350	144	last = last_intr_time;
404f3e95 JW	145	}
404f3e95 JW	146	spin_unlock_irqrestore(&timer_lock, flags);
cc06393a	147	ir_raw_event_handle(rcdev);
404f3e95 JW	148	}
	149
	150	static irqreturn_t sir_interrupt(int irq, void *dev_id)
	151	{
	152	unsigned char data;
34668350	153	ktime_t curr_time;
6efa0943	154	unsigned long delt;
34668350	155	unsigned long deltintr;
404f3e95	156	unsigned long flags;
592ddc9f	157	int counter = 0;
404f3e95 JW	158	int iir, lsr;
	159
	160	while ((iir = inb(io + UART_IIR) & UART_IIR_ID)) {
592ddc9f SY	161	if (++counter > 256) {
	162	dev_err(&sir_ir_dev->dev, "Trapped in interrupt");
	163	break;
	164	}
	165
43371f6b	166	switch (iir & UART_IIR_ID) { /* FIXME toto treba preriedit */
404f3e95	167	case UART_IIR_MSI:
43371f6b	168	(void)inb(io + UART_MSR);
404f3e95 JW	169	break;
404f3e95 JW	170	case UART_IIR_RLSI:
404f3e95	171	case UART_IIR_THRI:
43371f6b	172	(void)inb(io + UART_LSR);
404f3e95 JW	173	break;
	174	case UART_IIR_RDI:
	175	/* avoid interference with timer */
	176	spin_lock_irqsave(&timer_lock, flags);
	177	do {
	178	del_timer(&timerlist);
	179	data = inb(io + UART_RX);
34668350 KS	180	curr_time = ktime_get();
	181	delt = min_t(unsigned long,
	182	ktime_us_delta(last, curr_time),
cc06393a	183	IR_MAX_DURATION);
34668350 KS	184	deltintr = min_t(unsigned long,
	185	ktime_us_delta(last_intr_time,
	186	curr_time),
cc06393a SY	187	IR_MAX_DURATION);
	188	dev_dbg(&sir_ir_dev->dev, "t %lu, d %d\n",
	189	deltintr, (int)data);
404f3e95 JW	190	/*
	191	* if nothing came in last X cycles,
	192	* it was gap
	193	*/
34668350	194	if (deltintr > TIME_CONST * threshold) {
404f3e95	195	if (last_value) {
cc06393a	196	dev_dbg(&sir_ir_dev->dev, "GAP\n");
404f3e95 JW	197	/* simulate signal change */
404f3e95 JW	198	add_read_queue(last_value,
34668350 KS	199	delt -
34668350 KS	200	deltintr);
404f3e95	201	last_value = 0;
34668350 KS	202	last = last_intr_time;
34668350 KS	203	delt = deltintr;
404f3e95 JW	204	}
	205	}
	206	data = 1;
	207	if (data ^ last_value) {
	208	/*
34668350	209	* deltintr > 2*TIME_CONST, remember?
404f3e95 JW	210	* the other case is timeout
	211	*/
	212	add_read_queue(last_value,
43371f6b	213	delt - TIME_CONST);
404f3e95	214	last_value = data;
34668350 KS	215	last = curr_time;
	216	last = ktime_sub_us(last,
	217	TIME_CONST);
404f3e95	218	}
34668350	219	last_intr_time = curr_time;
404f3e95 JW	220	if (data) {
	221	/*
	222	* start timer for end of
	223	* sequence detection
	224	*/
	225	timerlist.expires = jiffies +
	226	SIR_TIMEOUT;
	227	add_timer(&timerlist);
	228	}
	229
	230	lsr = inb(io + UART_LSR);
	231	} while (lsr & UART_LSR_DR); /* data ready */
	232	spin_unlock_irqrestore(&timer_lock, flags);
	233	break;
	234	default:
	235	break;
	236	}
	237	}
cc06393a	238	ir_raw_event_handle(rcdev);
404f3e95 JW	239	return IRQ_RETVAL(IRQ_HANDLED);
	240	}
	241
404f3e95 JW	242	static void send_space(unsigned long len)
404f3e95 JW	243	{
19bc4e05	244	usleep_range(len, len + 25);
404f3e95 JW	245	}
	246
	247	static void send_pulse(unsigned long len)
	248	{
	249	long bytes_out = len / TIME_CONST;
404f3e95	250
04f561ff	251	if (bytes_out == 0)
404f3e95	252	bytes_out++;
04f561ff	253
404f3e95 JW	254	while (bytes_out--) {
	255	outb(PULSE, io + UART_TX);
	256	/* FIXME treba seriozne cakanie z char/serial.c */
	257	while (!(inb(io + UART_LSR) & UART_LSR_THRE))
	258	;
	259	}
404f3e95	260	}
404f3e95	261
30b4e122	262	static int init_hardware(void)
404f3e95	263	{
30b4e122	264	u8 scratch, scratch2, scratch3;
404f3e95 JW	265	unsigned long flags;
	266
	267	spin_lock_irqsave(&hardware_lock, flags);
30b4e122 SY	268
	269	/*
	270	* This is a simple port existence test, borrowed from the autoconfig
	271	* function in drivers/tty/serial/8250/8250_port.c
	272	*/
	273	scratch = sinp(UART_IER);
	274	soutp(UART_IER, 0);
	275	#ifdef __i386__
	276	outb(0xff, 0x080);
	277	#endif
	278	scratch2 = sinp(UART_IER) & 0x0f;
	279	soutp(UART_IER, 0x0f);
	280	#ifdef __i386__
	281	outb(0x00, 0x080);
	282	#endif
	283	scratch3 = sinp(UART_IER) & 0x0f;
	284	soutp(UART_IER, scratch);
	285	if (scratch2 != 0 \|\| scratch3 != 0x0f) {
	286	/* we fail, there's nothing here */
	287	spin_unlock_irqrestore(&hardware_lock, flags);
	288	pr_err("port existence test failed, cannot continue\n");
	289	return -ENODEV;
	290	}
	291
404f3e95	292	/* reset UART */
404f3e95 JW	293	outb(0, io + UART_MCR);
	294	outb(0, io + UART_IER);
	295	/* init UART */
	296	/* set DLAB, speed = 115200 */
	297	outb(UART_LCR_DLAB \| UART_LCR_WLEN7, io + UART_LCR);
	298	outb(1, io + UART_DLL); outb(0, io + UART_DLM);
	299	/* 7N1+start = 9 bits at 115200 ~ 3 bits at 44000 */
	300	outb(UART_LCR_WLEN7, io + UART_LCR);
	301	/* FIFO operation */
	302	outb(UART_FCR_ENABLE_FIFO, io + UART_FCR);
	303	/* interrupts */
	304	/* outb(UART_IER_RLSI\|UART_IER_RDI\|UART_IER_THRI, io + UART_IER); */
	305	outb(UART_IER_RDI, io + UART_IER);
	306	/* turn on UART */
43371f6b	307	outb(UART_MCR_DTR \| UART_MCR_RTS \| UART_MCR_OUT2, io + UART_MCR);
404f3e95	308	spin_unlock_irqrestore(&hardware_lock, flags);
30b4e122 SY	309
30b4e122 SY	310	return 0;
404f3e95 JW	311	}
	312
	313	static void drop_hardware(void)
	314	{
	315	unsigned long flags;
	316
	317	spin_lock_irqsave(&hardware_lock, flags);
	318
404f3e95 JW	319	/* turn off interrupts */
404f3e95 JW	320	outb(0, io + UART_IER);
c72374ff	321
404f3e95 JW	322	spin_unlock_irqrestore(&hardware_lock, flags);
	323	}
	324
	325	/* SECTION: Initialisation */
c52f2ba7	326	static int sir_ir_probe(struct platform_device *dev)
404f3e95 JW	327	{
	328	int retval;
	329
c52f2ba7 SY	330	rcdev = devm_rc_allocate_device(&sir_ir_dev->dev, RC_DRIVER_IR_RAW);
	331	if (!rcdev)
	332	return -ENOMEM;
	333
518f4b26	334	rcdev->device_name = "SIR IrDA port";
c52f2ba7 SY	335	rcdev->input_phys = KBUILD_MODNAME "/input0";
	336	rcdev->input_id.bustype = BUS_HOST;
	337	rcdev->input_id.vendor = 0x0001;
	338	rcdev->input_id.product = 0x0001;
	339	rcdev->input_id.version = 0x0100;
	340	rcdev->tx_ir = sir_tx_ir;
6d741bfe	341	rcdev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
c52f2ba7 SY	342	rcdev->driver_name = KBUILD_MODNAME;
	343	rcdev->map_name = RC_MAP_RC6_MCE;
	344	rcdev->timeout = IR_DEFAULT_TIMEOUT;
	345	rcdev->dev.parent = &sir_ir_dev->dev;
	346
b17ec78a	347	timer_setup(&timerlist, sir_timeout, 0);
8c7c6cad	348
404f3e95	349	/* get I/O port access and IRQ line */
b462e1b2	350	if (!devm_request_region(&sir_ir_dev->dev, io, 8, KBUILD_MODNAME)) {
014f0066	351	pr_err("i/o port 0x%.4x already in use.\n", io);
404f3e95 JW	352	return -EBUSY;
404f3e95 JW	353	}
b462e1b2 SY	354	retval = devm_request_irq(&sir_ir_dev->dev, irq, sir_interrupt, 0,
b462e1b2 SY	355	KBUILD_MODNAME, NULL);
404f3e95	356	if (retval < 0) {
014f0066	357	pr_err("IRQ %d already in use.\n", irq);
404f3e95 JW	358	return retval;
404f3e95 JW	359	}
30b4e122 SY	360
	361	retval = init_hardware();
	362	if (retval) {
	363	del_timer_sync(&timerlist);
	364	return retval;
	365	}
	366
014f0066	367	pr_info("I/O port 0x%.4x, IRQ %d.\n", io, irq);
404f3e95	368
c52f2ba7	369	retval = devm_rc_register_device(&sir_ir_dev->dev, rcdev);
cf9ed9aa SY	370	if (retval < 0)
	371	return retval;
	372
c52f2ba7	373	return 0;
4b71ca6b JW	374	}
4b71ca6b JW	375
cc06393a	376	static int sir_ir_remove(struct platform_device *dev)
4b71ca6b	377	{
1beb5a7d	378	drop_hardware();
f23f5408	379	del_timer_sync(&timerlist);
4b71ca6b JW	380	return 0;
	381	}
	382
cc06393a SY	383	static struct platform_driver sir_ir_driver = {
	384	.probe = sir_ir_probe,
	385	.remove = sir_ir_remove,
4b71ca6b	386	.driver = {
cc06393a	387	.name = "sir_ir",
4b71ca6b JW	388	},
4b71ca6b JW	389	};
404f3e95	390
cc06393a	391	static int __init sir_ir_init(void)
404f3e95 JW	392	{
	393	int retval;
	394
cc06393a	395	retval = platform_driver_register(&sir_ir_driver);
4d7cf7ec SY	396	if (retval)
4d7cf7ec SY	397	return retval;
4b71ca6b	398
cc06393a SY	399	sir_ir_dev = platform_device_alloc("sir_ir", 0);
cc06393a SY	400	if (!sir_ir_dev) {
4b71ca6b JW	401	retval = -ENOMEM;
	402	goto pdev_alloc_fail;
	403	}
	404
cc06393a	405	retval = platform_device_add(sir_ir_dev);
4d7cf7ec	406	if (retval)
4b71ca6b	407	goto pdev_add_fail;
4b71ca6b	408
404f3e95	409	return 0;
4b71ca6b	410
4b71ca6b	411	pdev_add_fail:
cc06393a	412	platform_device_put(sir_ir_dev);
4b71ca6b	413	pdev_alloc_fail:
cc06393a	414	platform_driver_unregister(&sir_ir_driver);
4b71ca6b	415	return retval;
404f3e95 JW	416	}
404f3e95 JW	417
cc06393a	418	static void __exit sir_ir_exit(void)
404f3e95	419	{
cc06393a SY	420	platform_device_unregister(sir_ir_dev);
cc06393a SY	421	platform_driver_unregister(&sir_ir_driver);
404f3e95 JW	422	}
404f3e95 JW	423
cc06393a SY	424	module_init(sir_ir_init);
cc06393a SY	425	module_exit(sir_ir_exit);
404f3e95	426
404f3e95 JW	427	MODULE_DESCRIPTION("Infrared receiver driver for SIR type serial ports");
404f3e95 JW	428	MODULE_AUTHOR("Milan Pikula");
404f3e95 JW	429	MODULE_LICENSE("GPL");
404f3e95 JW	430
6709e03c	431	module_param_hw(io, int, ioport, 0444);
404f3e95 JW	432	MODULE_PARM_DESC(io, "I/O address base (0x3f8 or 0x2f8)");
404f3e95 JW	433
6709e03c	434	module_param_hw(irq, int, irq, 0444);
404f3e95 JW	435	MODULE_PARM_DESC(irq, "Interrupt (4 or 3)");
404f3e95 JW	436
5cd6522c	437	module_param(threshold, int, 0444);
404f3e95	438	MODULE_PARM_DESC(threshold, "space detection threshold (3)");