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/*
* 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.
*/
/*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "iforce.h"
static void iforce_serio_xmit(struct iforce *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, 0x2b);
serio_write(iforce->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, iforce->xmit.buf[iforce->xmit.tail]);
cs ^= iforce->xmit.buf[iforce->xmit.tail];
XMIT_INC(iforce->xmit.tail, 1);
}
serio_write(iforce->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 *packet)
{
iforce->expect_packet = FF_CMD_QUERY;
iforce_send_packet(iforce, FF_CMD_QUERY, packet);
wait_event_interruptible_timeout(iforce->wait,
!iforce->expect_packet, HZ);
if (iforce->expect_packet) {
iforce->expect_packet = 0;
return -EIO;
}
return -(iforce->edata[0] != packet[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 *iforce = serio_get_drvdata(serio);
if (!iforce->pkt) {
if (data == 0x2b)
iforce->pkt = 1;
goto out;
}
if (!iforce->id) {
if (data > 3 && data != 0xff)
iforce->pkt = 0;
else
iforce->id = data;
goto out;
}
if (!iforce->len) {
if (data > IFORCE_MAX_LENGTH) {
iforce->pkt = 0;
iforce->id = 0;
} else {
iforce->len = data;
}
goto out;
}
if (iforce->idx < iforce->len) {
iforce->csum += iforce->data[iforce->idx++] = data;
goto out;
}
if (iforce->idx == iforce->len) {
u16 cmd = (iforce->id << 8) | iforce->idx;
/* Handle command completion */
if (HI(iforce->expect_packet) == HI(cmd)) {
iforce->expect_packet = 0;
iforce->ecmd = cmd;
memcpy(iforce->edata, iforce->data, IFORCE_MAX_LENGTH);
}
iforce_process_packet(iforce, cmd, iforce->data);
iforce->pkt = 0;
iforce->id = 0;
iforce->len = 0;
iforce->idx = 0;
iforce->csum = 0;
}
out:
return IRQ_HANDLED;
}
static int iforce_serio_connect(struct serio *serio, struct serio_driver *drv)
{
struct iforce *iforce;
int err;
iforce = kzalloc(sizeof(struct iforce), GFP_KERNEL);
if (!iforce)
return -ENOMEM;
iforce->xport_ops = &iforce_serio_xport_ops;
iforce->bus = IFORCE_232;
iforce->serio = serio;
serio_set_drvdata(serio, iforce);
err = serio_open(serio, drv);
if (err)
goto fail1;
err = iforce_init_device(iforce);
if (err)
goto fail2;
return 0;
fail2: serio_close(serio);
fail1: serio_set_drvdata(serio, NULL);
kfree(iforce);
return err;
}
static void iforce_serio_disconnect(struct serio *serio)
{
struct iforce *iforce = serio_get_drvdata(serio);
input_unregister_device(iforce->dev);
serio_close(serio);
serio_set_drvdata(serio, NULL);
kfree(iforce);
}
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,
};
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