311 lines
8.5 KiB
C
311 lines
8.5 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Parallel port to Walkera WK-0701 TX joystick
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*
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* Copyright (c) 2008 Peter Popovec
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*
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* More about driver: <file:Documentation/input/devices/walkera0701.rst>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#define RESERVE 20000
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#define SYNC_PULSE 1306000
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#define BIN0_PULSE 288000
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#define BIN1_PULSE 438000
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#define ANALOG_MIN_PULSE 318000
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#define ANALOG_MAX_PULSE 878000
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#define ANALOG_DELTA 80000
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#define BIN_SAMPLE ((BIN0_PULSE + BIN1_PULSE) / 2)
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#define NO_SYNC 25
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/parport.h>
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#include <linux/input.h>
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#include <linux/hrtimer.h>
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MODULE_AUTHOR("Peter Popovec <popovec@fei.tuke.sk>");
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MODULE_DESCRIPTION("Walkera WK-0701 TX as joystick");
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MODULE_LICENSE("GPL");
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static unsigned int walkera0701_pp_no;
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module_param_named(port, walkera0701_pp_no, int, 0);
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MODULE_PARM_DESC(port,
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"Parallel port adapter for Walkera WK-0701 TX (default is 0)");
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/*
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* For now, only one device is supported, if somebody need more devices, code
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* can be expanded, one struct walkera_dev per device must be allocated and
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* set up by walkera0701_connect (release of device by walkera0701_disconnect)
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*/
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struct walkera_dev {
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unsigned char buf[25];
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u64 irq_time, irq_lasttime;
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int counter;
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int ack;
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struct input_dev *input_dev;
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struct hrtimer timer;
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struct parport *parport;
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struct pardevice *pardevice;
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};
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static struct walkera_dev w_dev;
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static inline void walkera0701_parse_frame(struct walkera_dev *w)
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{
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int i;
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int val1, val2, val3, val4, val5, val6, val7, val8;
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int magic, magic_bit;
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int crc1, crc2;
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for (crc1 = crc2 = i = 0; i < 10; i++) {
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crc1 += w->buf[i] & 7;
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crc2 += (w->buf[i] & 8) >> 3;
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}
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if ((w->buf[10] & 7) != (crc1 & 7))
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return;
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if (((w->buf[10] & 8) >> 3) != (((crc1 >> 3) + crc2) & 1))
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return;
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for (crc1 = crc2 = 0, i = 11; i < 23; i++) {
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crc1 += w->buf[i] & 7;
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crc2 += (w->buf[i] & 8) >> 3;
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}
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if ((w->buf[23] & 7) != (crc1 & 7))
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return;
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if (((w->buf[23] & 8) >> 3) != (((crc1 >> 3) + crc2) & 1))
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return;
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val1 = ((w->buf[0] & 7) * 256 + w->buf[1] * 16 + w->buf[2]) >> 2;
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val1 *= ((w->buf[0] >> 2) & 2) - 1; /* sign */
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val2 = (w->buf[2] & 1) << 8 | (w->buf[3] << 4) | w->buf[4];
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val2 *= (w->buf[2] & 2) - 1; /* sign */
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val3 = ((w->buf[5] & 7) * 256 + w->buf[6] * 16 + w->buf[7]) >> 2;
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val3 *= ((w->buf[5] >> 2) & 2) - 1; /* sign */
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val4 = (w->buf[7] & 1) << 8 | (w->buf[8] << 4) | w->buf[9];
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val4 *= (w->buf[7] & 2) - 1; /* sign */
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val5 = ((w->buf[11] & 7) * 256 + w->buf[12] * 16 + w->buf[13]) >> 2;
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val5 *= ((w->buf[11] >> 2) & 2) - 1; /* sign */
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val6 = (w->buf[13] & 1) << 8 | (w->buf[14] << 4) | w->buf[15];
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val6 *= (w->buf[13] & 2) - 1; /* sign */
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val7 = ((w->buf[16] & 7) * 256 + w->buf[17] * 16 + w->buf[18]) >> 2;
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val7 *= ((w->buf[16] >> 2) & 2) - 1; /*sign */
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val8 = (w->buf[18] & 1) << 8 | (w->buf[19] << 4) | w->buf[20];
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val8 *= (w->buf[18] & 2) - 1; /*sign */
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magic = (w->buf[21] << 4) | w->buf[22];
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magic_bit = (w->buf[24] & 8) >> 3;
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pr_debug("%4d %4d %4d %4d %4d %4d %4d %4d (magic %2x %d)\n",
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val1, val2, val3, val4, val5, val6, val7, val8,
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magic, magic_bit);
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input_report_abs(w->input_dev, ABS_X, val2);
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input_report_abs(w->input_dev, ABS_Y, val1);
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input_report_abs(w->input_dev, ABS_Z, val6);
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input_report_abs(w->input_dev, ABS_THROTTLE, val3);
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input_report_abs(w->input_dev, ABS_RUDDER, val4);
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input_report_abs(w->input_dev, ABS_MISC, val7);
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input_report_key(w->input_dev, BTN_GEAR_DOWN, val5 > 0);
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}
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static inline int read_ack(struct pardevice *p)
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{
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return parport_read_status(p->port) & 0x40;
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}
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/* falling edge, prepare to BIN value calculation */
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static void walkera0701_irq_handler(void *handler_data)
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{
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u64 pulse_time;
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struct walkera_dev *w = handler_data;
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w->irq_time = ktime_to_ns(ktime_get());
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pulse_time = w->irq_time - w->irq_lasttime;
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w->irq_lasttime = w->irq_time;
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/* cancel timer, if in handler or active do resync */
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if (unlikely(0 != hrtimer_try_to_cancel(&w->timer))) {
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w->counter = NO_SYNC;
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return;
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}
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if (w->counter < NO_SYNC) {
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if (w->ack) {
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pulse_time -= BIN1_PULSE;
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w->buf[w->counter] = 8;
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} else {
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pulse_time -= BIN0_PULSE;
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w->buf[w->counter] = 0;
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}
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if (w->counter == 24) { /* full frame */
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walkera0701_parse_frame(w);
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w->counter = NO_SYNC;
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if (abs(pulse_time - SYNC_PULSE) < RESERVE) /* new frame sync */
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w->counter = 0;
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} else {
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if ((pulse_time > (ANALOG_MIN_PULSE - RESERVE)
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&& (pulse_time < (ANALOG_MAX_PULSE + RESERVE)))) {
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pulse_time -= (ANALOG_MIN_PULSE - RESERVE);
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pulse_time = (u32) pulse_time / ANALOG_DELTA; /* overtiping is safe, pulsetime < s32.. */
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w->buf[w->counter++] |= (pulse_time & 7);
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} else
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w->counter = NO_SYNC;
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}
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} else if (abs(pulse_time - SYNC_PULSE - BIN0_PULSE) <
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RESERVE + BIN1_PULSE - BIN0_PULSE) /* frame sync .. */
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w->counter = 0;
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hrtimer_start(&w->timer, BIN_SAMPLE, HRTIMER_MODE_REL);
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}
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static enum hrtimer_restart timer_handler(struct hrtimer
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*handle)
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{
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struct walkera_dev *w;
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w = container_of(handle, struct walkera_dev, timer);
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w->ack = read_ack(w->pardevice);
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return HRTIMER_NORESTART;
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}
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static int walkera0701_open(struct input_dev *dev)
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{
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struct walkera_dev *w = input_get_drvdata(dev);
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if (parport_claim(w->pardevice))
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return -EBUSY;
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parport_enable_irq(w->parport);
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return 0;
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}
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static void walkera0701_close(struct input_dev *dev)
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{
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struct walkera_dev *w = input_get_drvdata(dev);
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parport_disable_irq(w->parport);
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hrtimer_cancel(&w->timer);
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parport_release(w->pardevice);
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}
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static void walkera0701_attach(struct parport *pp)
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{
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struct pardev_cb walkera0701_parport_cb;
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struct walkera_dev *w = &w_dev;
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if (pp->number != walkera0701_pp_no) {
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pr_debug("Not using parport%d.\n", pp->number);
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return;
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}
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if (pp->irq == -1) {
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pr_err("parport %d does not have interrupt assigned\n",
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pp->number);
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return;
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}
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w->parport = pp;
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memset(&walkera0701_parport_cb, 0, sizeof(walkera0701_parport_cb));
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walkera0701_parport_cb.flags = PARPORT_FLAG_EXCL;
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walkera0701_parport_cb.irq_func = walkera0701_irq_handler;
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walkera0701_parport_cb.private = w;
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w->pardevice = parport_register_dev_model(pp, "walkera0701",
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&walkera0701_parport_cb, 0);
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if (!w->pardevice) {
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pr_err("failed to register parport device\n");
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return;
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}
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if (parport_negotiate(w->pardevice->port, IEEE1284_MODE_COMPAT)) {
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pr_err("failed to negotiate parport mode\n");
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goto err_unregister_device;
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}
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hrtimer_init(&w->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
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w->timer.function = timer_handler;
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w->input_dev = input_allocate_device();
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if (!w->input_dev) {
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pr_err("failed to allocate input device\n");
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goto err_unregister_device;
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}
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input_set_drvdata(w->input_dev, w);
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w->input_dev->name = "Walkera WK-0701 TX";
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w->input_dev->phys = w->parport->name;
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w->input_dev->id.bustype = BUS_PARPORT;
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/* TODO what id vendor/product/version ? */
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w->input_dev->id.vendor = 0x0001;
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w->input_dev->id.product = 0x0001;
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w->input_dev->id.version = 0x0100;
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w->input_dev->dev.parent = w->parport->dev;
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w->input_dev->open = walkera0701_open;
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w->input_dev->close = walkera0701_close;
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w->input_dev->evbit[0] = BIT(EV_ABS) | BIT_MASK(EV_KEY);
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w->input_dev->keybit[BIT_WORD(BTN_GEAR_DOWN)] = BIT_MASK(BTN_GEAR_DOWN);
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input_set_abs_params(w->input_dev, ABS_X, -512, 512, 0, 0);
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input_set_abs_params(w->input_dev, ABS_Y, -512, 512, 0, 0);
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input_set_abs_params(w->input_dev, ABS_Z, -512, 512, 0, 0);
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input_set_abs_params(w->input_dev, ABS_THROTTLE, -512, 512, 0, 0);
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input_set_abs_params(w->input_dev, ABS_RUDDER, -512, 512, 0, 0);
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input_set_abs_params(w->input_dev, ABS_MISC, -512, 512, 0, 0);
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if (input_register_device(w->input_dev)) {
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pr_err("failed to register input device\n");
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goto err_free_input_dev;
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}
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return;
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err_free_input_dev:
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input_free_device(w->input_dev);
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err_unregister_device:
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parport_unregister_device(w->pardevice);
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}
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static void walkera0701_detach(struct parport *port)
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{
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struct walkera_dev *w = &w_dev;
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if (!w->pardevice || w->parport->number != port->number)
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return;
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input_unregister_device(w->input_dev);
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parport_unregister_device(w->pardevice);
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w->parport = NULL;
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}
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static struct parport_driver walkera0701_parport_driver = {
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.name = "walkera0701",
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.match_port = walkera0701_attach,
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.detach = walkera0701_detach,
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.devmodel = true,
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};
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static int __init walkera0701_init(void)
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{
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return parport_register_driver(&walkera0701_parport_driver);
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}
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static void __exit walkera0701_exit(void)
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{
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parport_unregister_driver(&walkera0701_parport_driver);
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}
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module_init(walkera0701_init);
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module_exit(walkera0701_exit);
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