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