| /* |
| * 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); |
| /* 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 void 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) |
| { |
| 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); |
| } |
| |
| /* 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 void 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); |
| } |
| |
| 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; |
| } |
| 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; |
| |
| init_hardware(); |
| |
| 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)"); |