1 files changed, 438 insertions, 0 deletions

diff --git a/drivers/media/rc/sir_ir.c b/drivers/media/rc/sir_ir.c
new file mode 100644
index 0000000..e12ec50
--- /dev/null
+++ b/drivers/media/rc/sir_ir.c
@@ -0,0 +1,438 @@
+/*
+ * 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.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ */
+
+#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);
+static int init_chrdev(void);
+/* 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 int init_port(void);
+static void drop_port(void);
+
+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)
+{
+	DEFINE_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);
+}
+
+static int init_chrdev(void)
+{
+	rcdev = devm_rc_allocate_device(&sir_ir_dev->dev, RC_DRIVER_IR_RAW);
+	if (!rcdev)
+		return -ENOMEM;
+
+	rcdev->input_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_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;
+
+	return devm_rc_register_device(&sir_ir_dev->dev, rcdev);
+}
+
+/* SECTION: Hardware */
+static void sir_timeout(unsigned long data)
+{
+	/*
+	 * 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;
+	static unsigned long delt;
+	unsigned long deltintr;
+	unsigned long flags;
+	int iir, lsr;
+
+	while ((iir = inb(io + UART_IIR) & UART_IIR_ID)) {
+		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)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&hardware_lock, flags);
+	/* 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 init_port(void)
+{
+	int retval;
+
+	setup_timer(&timerlist, sir_timeout, 0);
+
+	/* get I/O port access and IRQ line */
+	if (!request_region(io, 8, KBUILD_MODNAME)) {
+		pr_err("i/o port 0x%.4x already in use.\n", io);
+		return -EBUSY;
+	}
+	retval = request_irq(irq, sir_interrupt, 0,
+			     KBUILD_MODNAME, NULL);
+	if (retval < 0) {
+		release_region(io, 8);
+		pr_err("IRQ %d already in use.\n", irq);
+		return retval;
+	}
+	pr_info("I/O port 0x%.4x, IRQ %d.\n", io, irq);
+
+	return 0;
+}
+
+static void drop_port(void)
+{
+	free_irq(irq, NULL);
+	del_timer_sync(&timerlist);
+	release_region(io, 8);
+}
+
+static int init_sir_ir(void)
+{
+	int retval;
+
+	retval = init_port();
+	if (retval < 0)
+		return retval;
+	init_hardware();
+	return 0;
+}
+
+static int sir_ir_probe(struct platform_device *dev)
+{
+	int retval;
+
+	retval = init_chrdev();
+	if (retval < 0)
+		return retval;
+
+	return init_sir_ir();
+}
+
+static int sir_ir_remove(struct platform_device *dev)
+{
+	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)
+{
+	drop_hardware();
+	drop_port();
+	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(io, int, 0444);
+MODULE_PARM_DESC(io, "I/O address base (0x3f8 or 0x2f8)");
+
+module_param(irq, int, 0444);
+MODULE_PARM_DESC(irq, "Interrupt (4 or 3)");
+
+module_param(threshold, int, 0444);
+MODULE_PARM_DESC(threshold, "space detection threshold (3)");