linux/drivers/input/serio/i8042-ppcio.h
Marcos Paulo de Souza 930e19248e Input: i8042 - skip selftest on ASUS laptops
On suspend/resume cycle, selftest is executed to reset i8042 controller.
But when this is done in Asus devices, subsequent calls to detect/init
functions to elantech driver fails. Skipping selftest fixes this problem.

An easier step to reproduce this problem is adding i8042.reset=1 as a
kernel parameter. On Asus laptops, it'll make the system to start with the
touchpad already stuck, since psmouse_probe forcibly calls the selftest
function.

This patch was inspired by John Hiesey's change[1], but, since this problem
affects a lot of models of Asus, let's avoid running selftests on them.

All models affected by this problem:
A455LD
K401LB
K501LB
K501LX
R409L
V502LX
X302LA
X450LCP
X450LD
X455LAB
X455LDB
X455LF
Z450LA

[1]: https://marc.info/?l=linux-input&m=144312209020616&w=2

Fixes: "ETPS/2 Elantech Touchpad dies after resume from suspend"
(https://bugzilla.kernel.org/show_bug.cgi?id=107971)

Signed-off-by: Marcos Paulo de Souza <marcos.souza.org@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
2016-10-11 16:58:25 -07:00

62 lines
1.1 KiB
C

#ifndef _I8042_PPCIO_H
#define _I8042_PPCIO_H
/*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*/
#if defined(CONFIG_WALNUT)
#define I8042_KBD_IRQ 25
#define I8042_AUX_IRQ 26
#define I8042_KBD_PHYS_DESC "walnutps2/serio0"
#define I8042_AUX_PHYS_DESC "walnutps2/serio1"
#define I8042_MUX_PHYS_DESC "walnutps2/serio%d"
extern void *kb_cs;
extern void *kb_data;
#define I8042_COMMAND_REG (*(int *)kb_cs)
#define I8042_DATA_REG (*(int *)kb_data)
static inline int i8042_read_data(void)
{
return readb(kb_data);
}
static inline int i8042_read_status(void)
{
return readb(kb_cs);
}
static inline void i8042_write_data(int val)
{
writeb(val, kb_data);
}
static inline void i8042_write_command(int val)
{
writeb(val, kb_cs);
}
static inline int i8042_platform_init(void)
{
i8042_reset = I8042_RESET_ALWAYS;
return 0;
}
static inline void i8042_platform_exit(void)
{
}
#else
#include "i8042-io.h"
#endif
#endif /* _I8042_PPCIO_H */