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930e19248e
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>
96 lines
1.9 KiB
C
96 lines
1.9 KiB
C
#ifndef _I8042_IO_H
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#define _I8042_IO_H
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/*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*/
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/*
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* Names.
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*/
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#define I8042_KBD_PHYS_DESC "isa0060/serio0"
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#define I8042_AUX_PHYS_DESC "isa0060/serio1"
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#define I8042_MUX_PHYS_DESC "isa0060/serio%d"
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/*
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* IRQs.
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*/
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#ifdef __alpha__
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# define I8042_KBD_IRQ 1
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# define I8042_AUX_IRQ (RTC_PORT(0) == 0x170 ? 9 : 12) /* Jensen is special */
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#elif defined(__arm__)
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/* defined in include/asm-arm/arch-xxx/irqs.h */
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#include <asm/irq.h>
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#elif defined(CONFIG_SH_CAYMAN)
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#include <asm/irq.h>
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#elif defined(CONFIG_PPC)
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extern int of_i8042_kbd_irq;
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extern int of_i8042_aux_irq;
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# define I8042_KBD_IRQ of_i8042_kbd_irq
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# define I8042_AUX_IRQ of_i8042_aux_irq
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#else
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# define I8042_KBD_IRQ 1
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# define I8042_AUX_IRQ 12
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#endif
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/*
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* Register numbers.
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*/
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#define I8042_COMMAND_REG 0x64
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#define I8042_STATUS_REG 0x64
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#define I8042_DATA_REG 0x60
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static inline int i8042_read_data(void)
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{
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return inb(I8042_DATA_REG);
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}
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static inline int i8042_read_status(void)
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{
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return inb(I8042_STATUS_REG);
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}
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static inline void i8042_write_data(int val)
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{
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outb(val, I8042_DATA_REG);
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}
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static inline void i8042_write_command(int val)
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{
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outb(val, I8042_COMMAND_REG);
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}
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static inline int i8042_platform_init(void)
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{
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/*
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* On some platforms touching the i8042 data register region can do really
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* bad things. Because of this the region is always reserved on such boxes.
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*/
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#if defined(CONFIG_PPC)
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if (check_legacy_ioport(I8042_DATA_REG))
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return -ENODEV;
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#endif
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#if !defined(__sh__) && !defined(__alpha__)
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if (!request_region(I8042_DATA_REG, 16, "i8042"))
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return -EBUSY;
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#endif
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i8042_reset = I8042_RESET_ALWAYS;
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return 0;
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}
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static inline void i8042_platform_exit(void)
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{
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#if !defined(__sh__) && !defined(__alpha__)
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release_region(I8042_DATA_REG, 16);
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#endif
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}
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#endif /* _I8042_IO_H */
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