forked from mirrors/linux
4097461897
As explained in 1407814240-4275-1-git-send-email-decui@microsoft.com we have a hard load dependency between i8042 and atkbd which prevents keyboard from working on Gen2 Hyper-V VMs. > hyperv_keyboard invokes serio_interrupt(), which needs a valid serio > driver like atkbd.c. atkbd.c depends on libps2.c because it invokes > ps2_command(). libps2.c depends on i8042.c because it invokes > i8042_check_port_owner(). As a result, hyperv_keyboard actually > depends on i8042.c. > > For a Generation 2 Hyper-V VM (meaning no i8042 device emulated), if a > Linux VM (like Arch Linux) happens to configure CONFIG_SERIO_I8042=m > rather than =y, atkbd.ko can't load because i8042.ko can't load(due to > no i8042 device emulated) and finally hyperv_keyboard can't work and > the user can't input: https://bugs.archlinux.org/task/39820 > (Ubuntu/RHEL/SUSE aren't affected since they use CONFIG_SERIO_I8042=y) To break the dependency we move away from using i8042_check_port_owner() and instead allow serio port owner specify a mutex that clients should use to serialize PS/2 command stream. Reported-by: Mark Laws <mdl@60hz.org> Tested-by: Mark Laws <mdl@60hz.org> Cc: stable@vger.kernel.org Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
99 lines
2.1 KiB
C
99 lines
2.1 KiB
C
#ifndef _LINUX_I8042_H
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#define _LINUX_I8042_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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#include <linux/types.h>
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/*
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* Standard commands.
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*/
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#define I8042_CMD_CTL_RCTR 0x0120
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#define I8042_CMD_CTL_WCTR 0x1060
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#define I8042_CMD_CTL_TEST 0x01aa
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#define I8042_CMD_KBD_DISABLE 0x00ad
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#define I8042_CMD_KBD_ENABLE 0x00ae
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#define I8042_CMD_KBD_TEST 0x01ab
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#define I8042_CMD_KBD_LOOP 0x11d2
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#define I8042_CMD_AUX_DISABLE 0x00a7
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#define I8042_CMD_AUX_ENABLE 0x00a8
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#define I8042_CMD_AUX_TEST 0x01a9
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#define I8042_CMD_AUX_SEND 0x10d4
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#define I8042_CMD_AUX_LOOP 0x11d3
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#define I8042_CMD_MUX_PFX 0x0090
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#define I8042_CMD_MUX_SEND 0x1090
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/*
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* Status register bits.
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*/
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#define I8042_STR_PARITY 0x80
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#define I8042_STR_TIMEOUT 0x40
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#define I8042_STR_AUXDATA 0x20
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#define I8042_STR_KEYLOCK 0x10
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#define I8042_STR_CMDDAT 0x08
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#define I8042_STR_MUXERR 0x04
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#define I8042_STR_IBF 0x02
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#define I8042_STR_OBF 0x01
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/*
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* Control register bits.
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*/
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#define I8042_CTR_KBDINT 0x01
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#define I8042_CTR_AUXINT 0x02
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#define I8042_CTR_IGNKEYLOCK 0x08
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#define I8042_CTR_KBDDIS 0x10
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#define I8042_CTR_AUXDIS 0x20
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#define I8042_CTR_XLATE 0x40
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struct serio;
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#if defined(CONFIG_SERIO_I8042) || defined(CONFIG_SERIO_I8042_MODULE)
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void i8042_lock_chip(void);
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void i8042_unlock_chip(void);
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int i8042_command(unsigned char *param, int command);
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int i8042_install_filter(bool (*filter)(unsigned char data, unsigned char str,
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struct serio *serio));
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int i8042_remove_filter(bool (*filter)(unsigned char data, unsigned char str,
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struct serio *serio));
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#else
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static inline void i8042_lock_chip(void)
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{
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}
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static inline void i8042_unlock_chip(void)
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{
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}
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static inline int i8042_command(unsigned char *param, int command)
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{
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return -ENODEV;
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}
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static inline int i8042_install_filter(bool (*filter)(unsigned char data, unsigned char str,
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struct serio *serio))
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{
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return -ENODEV;
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}
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static inline int i8042_remove_filter(bool (*filter)(unsigned char data, unsigned char str,
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struct serio *serio))
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{
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return -ENODEV;
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}
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#endif
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#endif
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