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/*
* nvec_ps2: mouse driver for a NVIDIA compliant embedded controller
*
* Copyright (C) 2011 The AC100 Kernel Team <ac100@lists.launchpad.net>
*
* Authors: Pierre-Hugues Husson <phhusson@free.fr>
* Ilya Petrov <ilya.muromec@gmail.com>
* Marc Dietrich <marvin24@gmx.de>
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/serio.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include "nvec.h"
#define PACKET_SIZE 6
#define ENABLE_MOUSE 0xf4
#define DISABLE_MOUSE 0xf5
#define PSMOUSE_RST 0xff
#ifdef NVEC_PS2_DEBUG
#define NVEC_PHD(str, buf, len) \
print_hex_dump(KERN_DEBUG, str, DUMP_PREFIX_NONE, \
16, 1, buf, len, false)
#else
#define NVEC_PHD(str, buf, len)
#endif
enum ps2_subcmds {
SEND_COMMAND = 1,
RECEIVE_N,
AUTO_RECEIVE_N,
CANCEL_AUTO_RECEIVE,
};
struct nvec_ps2 {
struct serio *ser_dev;
struct notifier_block notifier;
struct nvec_chip *nvec;
};
static struct nvec_ps2 ps2_dev;
static int ps2_startstreaming(struct serio *ser_dev)
{
unsigned char buf[] = { NVEC_PS2, AUTO_RECEIVE_N, PACKET_SIZE };
return nvec_write_async(ps2_dev.nvec, buf, sizeof(buf));
}
static void ps2_stopstreaming(struct serio *ser_dev)
{
unsigned char buf[] = { NVEC_PS2, CANCEL_AUTO_RECEIVE };
nvec_write_async(ps2_dev.nvec, buf, sizeof(buf));
}
static int ps2_sendcommand(struct serio *ser_dev, unsigned char cmd)
{
unsigned char buf[] = { NVEC_PS2, SEND_COMMAND, ENABLE_MOUSE, 1 };
buf[2] = cmd & 0xff;
dev_dbg(&ser_dev->dev, "Sending ps2 cmd %02x\n", cmd);
return nvec_write_async(ps2_dev.nvec, buf, sizeof(buf));
}
static int nvec_ps2_notifier(struct notifier_block *nb,
unsigned long event_type, void *data)
{
int i;
unsigned char *msg = (unsigned char *)data;
switch (event_type) {
case NVEC_PS2_EVT:
for (i = 0; i < msg[1]; i++)
serio_interrupt(ps2_dev.ser_dev, msg[2 + i], 0);
NVEC_PHD("ps/2 mouse event: ", &msg[2], msg[1]);
return NOTIFY_STOP;
case NVEC_PS2:
if (msg[2] == 1) {
for (i = 0; i < (msg[1] - 2); i++)
serio_interrupt(ps2_dev.ser_dev, msg[i + 4], 0);
NVEC_PHD("ps/2 mouse reply: ", &msg[4], msg[1] - 2);
}
else if (msg[1] != 2) /* !ack */
NVEC_PHD("unhandled mouse event: ", msg, msg[1] + 2);
return NOTIFY_STOP;
}
return NOTIFY_DONE;
}
static int nvec_mouse_probe(struct platform_device *pdev)
{
struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
struct serio *ser_dev;
char mouse_reset[] = { NVEC_PS2, SEND_COMMAND, PSMOUSE_RST, 3 };
ser_dev = devm_kzalloc(&pdev->dev, sizeof(struct serio), GFP_KERNEL);
if (ser_dev == NULL)
return -ENOMEM;
ser_dev->id.type = SERIO_PS_PSTHRU;
ser_dev->write = ps2_sendcommand;
ser_dev->start = ps2_startstreaming;
ser_dev->stop = ps2_stopstreaming;
strlcpy(ser_dev->name, "nvec mouse", sizeof(ser_dev->name));
strlcpy(ser_dev->phys, "nvec", sizeof(ser_dev->phys));
ps2_dev.ser_dev = ser_dev;
ps2_dev.notifier.notifier_call = nvec_ps2_notifier;
ps2_dev.nvec = nvec;
nvec_register_notifier(nvec, &ps2_dev.notifier, 0);
serio_register_port(ser_dev);
/* mouse reset */
nvec_write_async(nvec, mouse_reset, sizeof(mouse_reset));
return 0;
}
static int nvec_mouse_remove(struct platform_device *pdev)
{
serio_unregister_port(ps2_dev.ser_dev);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int nvec_mouse_suspend(struct device *dev)
{
/* disable mouse */
ps2_sendcommand(ps2_dev.ser_dev, DISABLE_MOUSE);
/* send cancel autoreceive */
ps2_stopstreaming(ps2_dev.ser_dev);
return 0;
}
static int nvec_mouse_resume(struct device *dev)
{
/* start streaming */
ps2_startstreaming(ps2_dev.ser_dev);
/* enable mouse */
ps2_sendcommand(ps2_dev.ser_dev, ENABLE_MOUSE);
return 0;
}
#endif
static const SIMPLE_DEV_PM_OPS(nvec_mouse_pm_ops, nvec_mouse_suspend,
nvec_mouse_resume);
static struct platform_driver nvec_mouse_driver = {
.probe = nvec_mouse_probe,
.remove = nvec_mouse_remove,
.driver = {
.name = "nvec-mouse",
.owner = THIS_MODULE,
.pm = &nvec_mouse_pm_ops,
},
};
module_platform_driver(nvec_mouse_driver);
MODULE_DESCRIPTION("NVEC mouse driver");
MODULE_AUTHOR("Marc Dietrich <marvin24@gmx.de>");
MODULE_LICENSE("GPL");
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