224 lines
5.0 KiB
C
224 lines
5.0 KiB
C
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/*
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*
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* FS-iA6B iBus RC receiver kernel driver
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* Copyright (C) 2018 Markus Koch <markus@notsyncing.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/input.h>
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#include <linux/serio.h>
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#include <linux/slab.h>
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#define SERIO_FSIA6B 100 /* TODO: This should be moved to the serio header */
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#define DRIVER_DESC "FS-iA6B iBus RC receiver"
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MODULE_AUTHOR("Markus Koch <markus@notsyncing.net>");
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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#define IBUS_SERVO_COUNT 14
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#define IBUS_SWITCH_OFFSET 6
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static int fsia6b_axes[IBUS_SERVO_COUNT] = {
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ABS_X, ABS_Y,
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ABS_Z, ABS_RX,
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ABS_RY, ABS_RZ,
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ABS_HAT0X, ABS_HAT0Y,
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ABS_HAT1X, ABS_HAT1Y,
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ABS_HAT2X, ABS_HAT2Y,
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ABS_HAT3X, ABS_HAT3Y
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};
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enum ibus_state {SYNC, COLLECT, PROCESS};
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struct ibus_packet {
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enum ibus_state state;
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int offset;
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uint16_t ibuf;
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uint16_t channel[IBUS_SERVO_COUNT];
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};
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struct fsia6b {
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struct input_dev *dev;
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struct ibus_packet packet;
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char phys[32];
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};
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static void fsia6b_serio_write_wakeup(struct serio *serio)
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{
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struct fsia6b *fsia6b = serio_get_drvdata(serio);
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printk(KERN_INFO "fsia6b: write wakeup.\n");
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}
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static irqreturn_t fsia6b_serio_irq(struct serio *serio,
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unsigned char data, unsigned int flags)
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{
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struct fsia6b *fsia6b = serio_get_drvdata(serio);
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int i;
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fsia6b->packet.ibuf = (data << 8) | ((fsia6b->packet.ibuf >> 8) & 0xFF);
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switch (fsia6b->packet.state) {
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case SYNC:
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if (fsia6b->packet.ibuf == 0x4020) {
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fsia6b->packet.state = COLLECT;
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}
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break;
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case COLLECT:
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fsia6b->packet.state = PROCESS;
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break;
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case PROCESS:
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fsia6b->packet.channel[fsia6b->packet.offset] = fsia6b->packet.ibuf;
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fsia6b->packet.offset++;
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if (fsia6b->packet.offset == IBUS_SERVO_COUNT) {
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fsia6b->packet.offset = 0;
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fsia6b->packet.state = SYNC;
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for (i = 0; i < IBUS_SERVO_COUNT; ++i) {
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input_report_abs(fsia6b->dev, fsia6b_axes[i],
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fsia6b->packet.channel[i]);
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if (i >= IBUS_SWITCH_OFFSET) {
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input_report_key(fsia6b->dev, BTN_1 + i*1,
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(fsia6b->packet.channel[i] > 1900));
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}
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}
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input_sync(fsia6b->dev);
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} else {
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fsia6b->packet.state = COLLECT;
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}
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break;
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}
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return IRQ_HANDLED;
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}
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int fsia6b_init_device(struct fsia6b *fsia6b)
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{
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printk(KERN_INFO "fsia6b: init.\n");
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return 0;
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}
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static int fsia6b_serio_connect(struct serio *serio, struct serio_driver *drv)
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{
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struct fsia6b *fsia6b;
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struct input_dev *input_dev;
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int err;
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int i;
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printk(KERN_INFO "fsia6b: connect.\n");
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fsia6b = kzalloc(sizeof(struct fsia6b), GFP_KERNEL);
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if (!fsia6b)
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return -ENOMEM;
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fsia6b->packet.ibuf = 0;
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fsia6b->packet.offset = 0;
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fsia6b->packet.state = SYNC;
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serio_set_drvdata(serio, fsia6b);
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err = serio_open(serio, drv);
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if (err)
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goto fail1;
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input_dev = input_allocate_device();
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err = -ENODEV;
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if (!input_dev)
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goto fail2;
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fsia6b->dev = input_dev;
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snprintf(fsia6b->phys, sizeof(fsia6b->phys), "%s/input0", serio->phys);
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input_dev->name = DRIVER_DESC;
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input_dev->phys = fsia6b->phys;
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input_dev->id.bustype = BUS_RS232;
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input_dev->id.vendor = SERIO_FSIA6B;
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input_dev->id.product = serio->id.id;
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input_dev->id.version = 0x0100;
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input_dev->dev.parent = &serio->dev;
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input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
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for (i = 0; i < IBUS_SERVO_COUNT; ++i) {
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input_set_abs_params(input_dev, fsia6b_axes[i], 1000, 2000, 2, 2);
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if (i >= IBUS_SWITCH_OFFSET) {
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input_dev->keybit[BIT_WORD(BTN_0)] |= BIT_MASK(BTN_1 + i);
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}
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}
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err = input_register_device(fsia6b->dev);
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if (err)
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goto fail2;
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err = fsia6b_init_device(fsia6b);
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if (err)
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goto fail3;
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return 0;
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fail3: input_free_device(input_dev);
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fail2: serio_close(serio);
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fail1: serio_set_drvdata(serio, NULL);
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kfree(fsia6b);
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return err;
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}
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static void fsia6b_serio_disconnect(struct serio *serio)
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{
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struct fsia6b *fsia6b = serio_get_drvdata(serio);
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printk(KERN_INFO "fsia6b: disconnect.\n");
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serio_close(serio);
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serio_set_drvdata(serio, NULL);
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input_unregister_device(fsia6b->dev);
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kfree(fsia6b);
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}
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static const struct serio_device_id fsia6b_serio_ids[] = {
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{
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.type = SERIO_RS232,
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.proto = SERIO_FSIA6B,
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.id = SERIO_ANY,
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.extra = SERIO_ANY,
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},
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{ 0 }
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};
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MODULE_DEVICE_TABLE(serio, fsia6b_serio_ids);
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struct serio_driver fsia6b_serio_drv = {
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.driver = {
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.name = "fsia6b"
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},
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.description = DRIVER_DESC,
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.id_table = fsia6b_serio_ids,
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.write_wakeup = fsia6b_serio_write_wakeup,
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.interrupt = fsia6b_serio_irq,
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.connect = fsia6b_serio_connect,
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.disconnect = fsia6b_serio_disconnect
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};
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module_serio_driver(fsia6b_serio_drv)
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