258 строки
6.0 KiB
C
258 строки
6.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2000-2001 Vojtech Pavlik <vojtech@ucw.cz>
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* Copyright (c) 2001, 2007 Johann Deneux <johann.deneux@gmail.com>
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*
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* USB/RS232 I-Force joysticks and wheels.
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*/
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#include <linux/serio.h>
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#include "iforce.h"
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struct iforce_serio {
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struct iforce iforce;
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struct serio *serio;
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int idx, pkt, len, id;
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u8 csum;
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u8 expect_packet;
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u8 cmd_response[IFORCE_MAX_LENGTH];
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u8 cmd_response_len;
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u8 data_in[IFORCE_MAX_LENGTH];
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};
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static void iforce_serio_xmit(struct iforce *iforce)
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{
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struct iforce_serio *iforce_serio = container_of(iforce,
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struct iforce_serio,
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iforce);
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unsigned char cs;
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int i;
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unsigned long flags;
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if (test_and_set_bit(IFORCE_XMIT_RUNNING, iforce->xmit_flags)) {
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set_bit(IFORCE_XMIT_AGAIN, iforce->xmit_flags);
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return;
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}
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spin_lock_irqsave(&iforce->xmit_lock, flags);
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again:
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if (iforce->xmit.head == iforce->xmit.tail) {
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clear_bit(IFORCE_XMIT_RUNNING, iforce->xmit_flags);
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spin_unlock_irqrestore(&iforce->xmit_lock, flags);
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return;
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}
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cs = 0x2b;
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serio_write(iforce_serio->serio, 0x2b);
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serio_write(iforce_serio->serio, iforce->xmit.buf[iforce->xmit.tail]);
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cs ^= iforce->xmit.buf[iforce->xmit.tail];
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XMIT_INC(iforce->xmit.tail, 1);
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for (i=iforce->xmit.buf[iforce->xmit.tail]; i >= 0; --i) {
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serio_write(iforce_serio->serio,
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iforce->xmit.buf[iforce->xmit.tail]);
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cs ^= iforce->xmit.buf[iforce->xmit.tail];
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XMIT_INC(iforce->xmit.tail, 1);
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}
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serio_write(iforce_serio->serio, cs);
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if (test_and_clear_bit(IFORCE_XMIT_AGAIN, iforce->xmit_flags))
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goto again;
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clear_bit(IFORCE_XMIT_RUNNING, iforce->xmit_flags);
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spin_unlock_irqrestore(&iforce->xmit_lock, flags);
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}
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static int iforce_serio_get_id(struct iforce *iforce, u8 id,
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u8 *response_data, size_t *response_len)
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{
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struct iforce_serio *iforce_serio = container_of(iforce,
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struct iforce_serio,
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iforce);
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iforce_serio->expect_packet = HI(FF_CMD_QUERY);
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iforce_serio->cmd_response_len = 0;
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iforce_send_packet(iforce, FF_CMD_QUERY, &id);
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wait_event_interruptible_timeout(iforce->wait,
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!iforce_serio->expect_packet, HZ);
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if (iforce_serio->expect_packet) {
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iforce_serio->expect_packet = 0;
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return -ETIMEDOUT;
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}
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if (iforce_serio->cmd_response[0] != id)
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return -EIO;
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memcpy(response_data, iforce_serio->cmd_response,
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iforce_serio->cmd_response_len);
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*response_len = iforce_serio->cmd_response_len;
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return 0;
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}
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static int iforce_serio_start_io(struct iforce *iforce)
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{
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/* No special handling required */
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return 0;
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}
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static void iforce_serio_stop_io(struct iforce *iforce)
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{
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//TODO: Wait for the last packets to be sent
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}
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static const struct iforce_xport_ops iforce_serio_xport_ops = {
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.xmit = iforce_serio_xmit,
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.get_id = iforce_serio_get_id,
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.start_io = iforce_serio_start_io,
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.stop_io = iforce_serio_stop_io,
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};
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static void iforce_serio_write_wakeup(struct serio *serio)
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{
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struct iforce *iforce = serio_get_drvdata(serio);
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iforce_serio_xmit(iforce);
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}
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static irqreturn_t iforce_serio_irq(struct serio *serio,
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unsigned char data, unsigned int flags)
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{
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struct iforce_serio *iforce_serio = serio_get_drvdata(serio);
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struct iforce *iforce = &iforce_serio->iforce;
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if (!iforce_serio->pkt) {
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if (data == 0x2b)
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iforce_serio->pkt = 1;
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goto out;
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}
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if (!iforce_serio->id) {
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if (data > 3 && data != 0xff)
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iforce_serio->pkt = 0;
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else
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iforce_serio->id = data;
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goto out;
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}
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if (!iforce_serio->len) {
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if (data > IFORCE_MAX_LENGTH) {
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iforce_serio->pkt = 0;
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iforce_serio->id = 0;
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} else {
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iforce_serio->len = data;
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}
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goto out;
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}
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if (iforce_serio->idx < iforce_serio->len) {
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iforce_serio->data_in[iforce_serio->idx++] = data;
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iforce_serio->csum += data;
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goto out;
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}
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if (iforce_serio->idx == iforce_serio->len) {
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/* Handle command completion */
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if (iforce_serio->expect_packet == iforce_serio->id) {
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iforce_serio->expect_packet = 0;
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memcpy(iforce_serio->cmd_response,
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iforce_serio->data_in, IFORCE_MAX_LENGTH);
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iforce_serio->cmd_response_len = iforce_serio->len;
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/* Signal that command is done */
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wake_up(&iforce->wait);
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} else if (likely(iforce->type)) {
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iforce_process_packet(iforce, iforce_serio->id,
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iforce_serio->data_in,
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iforce_serio->len);
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}
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iforce_serio->pkt = 0;
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iforce_serio->id = 0;
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iforce_serio->len = 0;
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iforce_serio->idx = 0;
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iforce_serio->csum = 0;
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}
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out:
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return IRQ_HANDLED;
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}
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static int iforce_serio_connect(struct serio *serio, struct serio_driver *drv)
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{
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struct iforce_serio *iforce_serio;
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int err;
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iforce_serio = kzalloc(sizeof(*iforce_serio), GFP_KERNEL);
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if (!iforce_serio)
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return -ENOMEM;
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iforce_serio->iforce.xport_ops = &iforce_serio_xport_ops;
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iforce_serio->serio = serio;
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serio_set_drvdata(serio, iforce_serio);
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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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err = iforce_init_device(&serio->dev, BUS_RS232, &iforce_serio->iforce);
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if (err)
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goto fail2;
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return 0;
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fail2: serio_close(serio);
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fail1: serio_set_drvdata(serio, NULL);
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kfree(iforce_serio);
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return err;
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}
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static void iforce_serio_disconnect(struct serio *serio)
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{
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struct iforce_serio *iforce_serio = serio_get_drvdata(serio);
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input_unregister_device(iforce_serio->iforce.dev);
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serio_close(serio);
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serio_set_drvdata(serio, NULL);
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kfree(iforce_serio);
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}
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static const struct serio_device_id iforce_serio_ids[] = {
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{
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.type = SERIO_RS232,
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.proto = SERIO_IFORCE,
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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, iforce_serio_ids);
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struct serio_driver iforce_serio_drv = {
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.driver = {
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.name = "iforce",
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},
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.description = "RS232 I-Force joysticks and wheels driver",
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.id_table = iforce_serio_ids,
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.write_wakeup = iforce_serio_write_wakeup,
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.interrupt = iforce_serio_irq,
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.connect = iforce_serio_connect,
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.disconnect = iforce_serio_disconnect,
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};
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module_serio_driver(iforce_serio_drv);
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MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>, Johann Deneux <johann.deneux@gmail.com>");
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MODULE_DESCRIPTION("RS232 I-Force joysticks and wheels driver");
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MODULE_LICENSE("GPL");
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