439 lines
10 KiB
C
439 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* IR SIR driver, (C) 2000 Milan Pikula <www@fornax.sk>
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*
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* sir_ir - Device driver for use with SIR (serial infra red)
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* mode of IrDA on many notebooks.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/serial_reg.h>
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#include <linux/ktime.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <media/rc-core.h>
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/* SECTION: Definitions */
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#define PULSE '['
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/* 9bit * 1s/115200bit in milli seconds = 78.125ms*/
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#define TIME_CONST (9000000ul / 115200ul)
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/* timeout for sequences in jiffies (=5/100s), must be longer than TIME_CONST */
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#define SIR_TIMEOUT (HZ * 5 / 100)
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/* onboard sir ports are typically com3 */
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static int io = 0x3e8;
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static int irq = 4;
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static int threshold = 3;
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static DEFINE_SPINLOCK(timer_lock);
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static struct timer_list timerlist;
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/* time of last signal change detected */
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static ktime_t last;
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/* time of last UART data ready interrupt */
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static ktime_t last_intr_time;
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static int last_value;
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static struct rc_dev *rcdev;
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static struct platform_device *sir_ir_dev;
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static DEFINE_SPINLOCK(hardware_lock);
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/* SECTION: Prototypes */
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/* Communication with user-space */
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static void add_read_queue(int flag, unsigned long val);
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/* Hardware */
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static irqreturn_t sir_interrupt(int irq, void *dev_id);
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static void send_space(unsigned long len);
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static void send_pulse(unsigned long len);
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static int init_hardware(void);
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static void drop_hardware(void);
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/* Initialisation */
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static inline unsigned int sinp(int offset)
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{
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return inb(io + offset);
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}
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static inline void soutp(int offset, int value)
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{
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outb(value, io + offset);
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}
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/* SECTION: Communication with user-space */
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static int sir_tx_ir(struct rc_dev *dev, unsigned int *tx_buf,
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unsigned int count)
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{
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unsigned long flags;
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int i;
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local_irq_save(flags);
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for (i = 0; i < count;) {
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if (tx_buf[i])
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send_pulse(tx_buf[i]);
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i++;
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if (i >= count)
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break;
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if (tx_buf[i])
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send_space(tx_buf[i]);
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i++;
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}
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local_irq_restore(flags);
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return count;
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}
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static void add_read_queue(int flag, unsigned long val)
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{
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struct ir_raw_event ev = {};
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pr_debug("add flag %d with val %lu\n", flag, val);
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/*
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* statistically, pulses are ~TIME_CONST/2 too long. we could
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* maybe make this more exact, but this is good enough
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*/
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if (flag) {
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/* pulse */
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if (val > TIME_CONST / 2)
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val -= TIME_CONST / 2;
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else /* should not ever happen */
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val = 1;
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ev.pulse = true;
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} else {
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val += TIME_CONST / 2;
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}
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ev.duration = US_TO_NS(val);
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ir_raw_event_store_with_filter(rcdev, &ev);
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}
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/* SECTION: Hardware */
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static void sir_timeout(struct timer_list *unused)
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{
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/*
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* if last received signal was a pulse, but receiving stopped
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* within the 9 bit frame, we need to finish this pulse and
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* simulate a signal change to from pulse to space. Otherwise
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* upper layers will receive two sequences next time.
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*/
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unsigned long flags;
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unsigned long pulse_end;
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/* avoid interference with interrupt */
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spin_lock_irqsave(&timer_lock, flags);
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if (last_value) {
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/* clear unread bits in UART and restart */
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outb(UART_FCR_CLEAR_RCVR, io + UART_FCR);
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/* determine 'virtual' pulse end: */
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pulse_end = min_t(unsigned long,
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ktime_us_delta(last, last_intr_time),
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IR_MAX_DURATION);
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dev_dbg(&sir_ir_dev->dev, "timeout add %d for %lu usec\n",
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last_value, pulse_end);
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add_read_queue(last_value, pulse_end);
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last_value = 0;
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last = last_intr_time;
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}
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spin_unlock_irqrestore(&timer_lock, flags);
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ir_raw_event_handle(rcdev);
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}
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static irqreturn_t sir_interrupt(int irq, void *dev_id)
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{
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unsigned char data;
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ktime_t curr_time;
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unsigned long delt;
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unsigned long deltintr;
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unsigned long flags;
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int counter = 0;
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int iir, lsr;
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while ((iir = inb(io + UART_IIR) & UART_IIR_ID)) {
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if (++counter > 256) {
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dev_err(&sir_ir_dev->dev, "Trapped in interrupt");
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break;
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}
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switch (iir & UART_IIR_ID) { /* FIXME toto treba preriedit */
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case UART_IIR_MSI:
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(void)inb(io + UART_MSR);
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break;
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case UART_IIR_RLSI:
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case UART_IIR_THRI:
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(void)inb(io + UART_LSR);
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break;
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case UART_IIR_RDI:
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/* avoid interference with timer */
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spin_lock_irqsave(&timer_lock, flags);
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do {
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del_timer(&timerlist);
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data = inb(io + UART_RX);
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curr_time = ktime_get();
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delt = min_t(unsigned long,
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ktime_us_delta(last, curr_time),
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IR_MAX_DURATION);
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deltintr = min_t(unsigned long,
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ktime_us_delta(last_intr_time,
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curr_time),
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IR_MAX_DURATION);
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dev_dbg(&sir_ir_dev->dev, "t %lu, d %d\n",
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deltintr, (int)data);
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/*
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* if nothing came in last X cycles,
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* it was gap
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*/
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if (deltintr > TIME_CONST * threshold) {
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if (last_value) {
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dev_dbg(&sir_ir_dev->dev, "GAP\n");
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/* simulate signal change */
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add_read_queue(last_value,
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delt -
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deltintr);
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last_value = 0;
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last = last_intr_time;
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delt = deltintr;
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}
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}
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data = 1;
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if (data ^ last_value) {
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/*
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* deltintr > 2*TIME_CONST, remember?
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* the other case is timeout
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*/
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add_read_queue(last_value,
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delt - TIME_CONST);
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last_value = data;
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last = curr_time;
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last = ktime_sub_us(last,
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TIME_CONST);
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}
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last_intr_time = curr_time;
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if (data) {
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/*
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* start timer for end of
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* sequence detection
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*/
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timerlist.expires = jiffies +
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SIR_TIMEOUT;
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add_timer(&timerlist);
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}
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lsr = inb(io + UART_LSR);
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} while (lsr & UART_LSR_DR); /* data ready */
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spin_unlock_irqrestore(&timer_lock, flags);
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break;
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default:
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break;
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}
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}
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ir_raw_event_handle(rcdev);
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return IRQ_RETVAL(IRQ_HANDLED);
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}
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static void send_space(unsigned long len)
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{
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usleep_range(len, len + 25);
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}
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static void send_pulse(unsigned long len)
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{
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long bytes_out = len / TIME_CONST;
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if (bytes_out == 0)
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bytes_out++;
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while (bytes_out--) {
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outb(PULSE, io + UART_TX);
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/* FIXME treba seriozne cakanie z char/serial.c */
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while (!(inb(io + UART_LSR) & UART_LSR_THRE))
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;
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}
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}
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static int init_hardware(void)
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{
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u8 scratch, scratch2, scratch3;
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unsigned long flags;
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spin_lock_irqsave(&hardware_lock, flags);
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/*
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* This is a simple port existence test, borrowed from the autoconfig
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* function in drivers/tty/serial/8250/8250_port.c
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*/
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scratch = sinp(UART_IER);
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soutp(UART_IER, 0);
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#ifdef __i386__
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outb(0xff, 0x080);
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#endif
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scratch2 = sinp(UART_IER) & 0x0f;
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soutp(UART_IER, 0x0f);
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#ifdef __i386__
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outb(0x00, 0x080);
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#endif
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scratch3 = sinp(UART_IER) & 0x0f;
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soutp(UART_IER, scratch);
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if (scratch2 != 0 || scratch3 != 0x0f) {
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/* we fail, there's nothing here */
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spin_unlock_irqrestore(&hardware_lock, flags);
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pr_err("port existence test failed, cannot continue\n");
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return -ENODEV;
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}
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/* reset UART */
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outb(0, io + UART_MCR);
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outb(0, io + UART_IER);
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/* init UART */
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/* set DLAB, speed = 115200 */
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outb(UART_LCR_DLAB | UART_LCR_WLEN7, io + UART_LCR);
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outb(1, io + UART_DLL); outb(0, io + UART_DLM);
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/* 7N1+start = 9 bits at 115200 ~ 3 bits at 44000 */
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outb(UART_LCR_WLEN7, io + UART_LCR);
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/* FIFO operation */
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outb(UART_FCR_ENABLE_FIFO, io + UART_FCR);
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/* interrupts */
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/* outb(UART_IER_RLSI|UART_IER_RDI|UART_IER_THRI, io + UART_IER); */
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outb(UART_IER_RDI, io + UART_IER);
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/* turn on UART */
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outb(UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2, io + UART_MCR);
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spin_unlock_irqrestore(&hardware_lock, flags);
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return 0;
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}
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static void drop_hardware(void)
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{
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unsigned long flags;
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spin_lock_irqsave(&hardware_lock, flags);
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/* turn off interrupts */
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outb(0, io + UART_IER);
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spin_unlock_irqrestore(&hardware_lock, flags);
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}
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/* SECTION: Initialisation */
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static int sir_ir_probe(struct platform_device *dev)
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{
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int retval;
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rcdev = devm_rc_allocate_device(&sir_ir_dev->dev, RC_DRIVER_IR_RAW);
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if (!rcdev)
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return -ENOMEM;
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rcdev->device_name = "SIR IrDA port";
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rcdev->input_phys = KBUILD_MODNAME "/input0";
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rcdev->input_id.bustype = BUS_HOST;
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rcdev->input_id.vendor = 0x0001;
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rcdev->input_id.product = 0x0001;
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rcdev->input_id.version = 0x0100;
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rcdev->tx_ir = sir_tx_ir;
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rcdev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
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rcdev->driver_name = KBUILD_MODNAME;
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rcdev->map_name = RC_MAP_RC6_MCE;
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rcdev->timeout = IR_DEFAULT_TIMEOUT;
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rcdev->dev.parent = &sir_ir_dev->dev;
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timer_setup(&timerlist, sir_timeout, 0);
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/* get I/O port access and IRQ line */
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if (!devm_request_region(&sir_ir_dev->dev, io, 8, KBUILD_MODNAME)) {
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pr_err("i/o port 0x%.4x already in use.\n", io);
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return -EBUSY;
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}
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retval = devm_request_irq(&sir_ir_dev->dev, irq, sir_interrupt, 0,
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KBUILD_MODNAME, NULL);
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if (retval < 0) {
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pr_err("IRQ %d already in use.\n", irq);
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return retval;
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}
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retval = init_hardware();
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if (retval) {
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del_timer_sync(&timerlist);
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return retval;
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}
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pr_info("I/O port 0x%.4x, IRQ %d.\n", io, irq);
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retval = devm_rc_register_device(&sir_ir_dev->dev, rcdev);
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if (retval < 0)
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return retval;
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return 0;
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}
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static int sir_ir_remove(struct platform_device *dev)
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{
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drop_hardware();
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del_timer_sync(&timerlist);
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return 0;
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}
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static struct platform_driver sir_ir_driver = {
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.probe = sir_ir_probe,
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.remove = sir_ir_remove,
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.driver = {
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.name = "sir_ir",
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},
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};
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static int __init sir_ir_init(void)
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{
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int retval;
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retval = platform_driver_register(&sir_ir_driver);
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if (retval)
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return retval;
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sir_ir_dev = platform_device_alloc("sir_ir", 0);
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if (!sir_ir_dev) {
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retval = -ENOMEM;
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goto pdev_alloc_fail;
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}
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retval = platform_device_add(sir_ir_dev);
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if (retval)
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goto pdev_add_fail;
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return 0;
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pdev_add_fail:
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platform_device_put(sir_ir_dev);
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pdev_alloc_fail:
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platform_driver_unregister(&sir_ir_driver);
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return retval;
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}
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static void __exit sir_ir_exit(void)
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{
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platform_device_unregister(sir_ir_dev);
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platform_driver_unregister(&sir_ir_driver);
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}
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module_init(sir_ir_init);
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module_exit(sir_ir_exit);
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MODULE_DESCRIPTION("Infrared receiver driver for SIR type serial ports");
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MODULE_AUTHOR("Milan Pikula");
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MODULE_LICENSE("GPL");
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module_param_hw(io, int, ioport, 0444);
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MODULE_PARM_DESC(io, "I/O address base (0x3f8 or 0x2f8)");
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module_param_hw(irq, int, irq, 0444);
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MODULE_PARM_DESC(irq, "Interrupt (4 or 3)");
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module_param(threshold, int, 0444);
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MODULE_PARM_DESC(threshold, "space detection threshold (3)");
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