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https://github.com/nxp-imx/linux-imx.git
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538cff0a1a
commit 4097461897 upstream.
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>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
221 lines
5.3 KiB
C
221 lines
5.3 KiB
C
#ifndef _SERIO_H
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#define _SERIO_H
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/*
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* Copyright (C) 1999-2002 Vojtech Pavlik
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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/ioctl.h>
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#define SPIOCSTYPE _IOW('q', 0x01, unsigned long)
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#ifdef __KERNEL__
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#include <linux/types.h>
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#include <linux/interrupt.h>
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#include <linux/list.h>
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#include <linux/spinlock.h>
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#include <linux/mutex.h>
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#include <linux/device.h>
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#include <linux/mod_devicetable.h>
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struct serio {
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void *port_data;
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char name[32];
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char phys[32];
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bool manual_bind;
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struct serio_device_id id;
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/* Protects critical sections from port's interrupt handler */
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spinlock_t lock;
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int (*write)(struct serio *, unsigned char);
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int (*open)(struct serio *);
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void (*close)(struct serio *);
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int (*start)(struct serio *);
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void (*stop)(struct serio *);
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struct serio *parent;
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/* Entry in parent->children list */
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struct list_head child_node;
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struct list_head children;
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/* Level of nesting in serio hierarchy */
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unsigned int depth;
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/*
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* serio->drv is accessed from interrupt handlers; when modifying
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* caller should acquire serio->drv_mutex and serio->lock.
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*/
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struct serio_driver *drv;
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/* Protects serio->drv so attributes can pin current driver */
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struct mutex drv_mutex;
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struct device dev;
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struct list_head node;
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/*
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* For use by PS/2 layer when several ports share hardware and
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* may get indigestion when exposed to concurrent access (i8042).
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*/
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struct mutex *ps2_cmd_mutex;
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};
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#define to_serio_port(d) container_of(d, struct serio, dev)
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struct serio_driver {
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const char *description;
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const struct serio_device_id *id_table;
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bool manual_bind;
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void (*write_wakeup)(struct serio *);
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irqreturn_t (*interrupt)(struct serio *, unsigned char, unsigned int);
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int (*connect)(struct serio *, struct serio_driver *drv);
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int (*reconnect)(struct serio *);
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void (*disconnect)(struct serio *);
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void (*cleanup)(struct serio *);
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struct device_driver driver;
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};
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#define to_serio_driver(d) container_of(d, struct serio_driver, driver)
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int serio_open(struct serio *serio, struct serio_driver *drv);
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void serio_close(struct serio *serio);
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void serio_rescan(struct serio *serio);
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void serio_reconnect(struct serio *serio);
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irqreturn_t serio_interrupt(struct serio *serio, unsigned char data, unsigned int flags);
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void __serio_register_port(struct serio *serio, struct module *owner);
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/* use a define to avoid include chaining to get THIS_MODULE */
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#define serio_register_port(serio) \
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__serio_register_port(serio, THIS_MODULE)
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void serio_unregister_port(struct serio *serio);
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void serio_unregister_child_port(struct serio *serio);
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int __must_check __serio_register_driver(struct serio_driver *drv,
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struct module *owner, const char *mod_name);
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/* use a define to avoid include chaining to get THIS_MODULE & friends */
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#define serio_register_driver(drv) \
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__serio_register_driver(drv, THIS_MODULE, KBUILD_MODNAME)
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void serio_unregister_driver(struct serio_driver *drv);
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static inline int serio_write(struct serio *serio, unsigned char data)
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{
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if (serio->write)
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return serio->write(serio, data);
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else
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return -1;
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}
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static inline void serio_drv_write_wakeup(struct serio *serio)
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{
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if (serio->drv && serio->drv->write_wakeup)
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serio->drv->write_wakeup(serio);
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}
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/*
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* Use the following functions to manipulate serio's per-port
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* driver-specific data.
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*/
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static inline void *serio_get_drvdata(struct serio *serio)
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{
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return dev_get_drvdata(&serio->dev);
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}
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static inline void serio_set_drvdata(struct serio *serio, void *data)
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{
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dev_set_drvdata(&serio->dev, data);
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}
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/*
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* Use the following functions to protect critical sections in
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* driver code from port's interrupt handler
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*/
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static inline void serio_pause_rx(struct serio *serio)
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{
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spin_lock_irq(&serio->lock);
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}
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static inline void serio_continue_rx(struct serio *serio)
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{
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spin_unlock_irq(&serio->lock);
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}
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#endif
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/*
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* bit masks for use in "interrupt" flags (3rd argument)
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*/
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#define SERIO_TIMEOUT 1
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#define SERIO_PARITY 2
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#define SERIO_FRAME 4
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/*
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* Serio types
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*/
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#define SERIO_XT 0x00
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#define SERIO_8042 0x01
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#define SERIO_RS232 0x02
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#define SERIO_HIL_MLC 0x03
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#define SERIO_PS_PSTHRU 0x05
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#define SERIO_8042_XL 0x06
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/*
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* Serio protocols
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*/
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#define SERIO_UNKNOWN 0x00
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#define SERIO_MSC 0x01
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#define SERIO_SUN 0x02
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#define SERIO_MS 0x03
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#define SERIO_MP 0x04
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#define SERIO_MZ 0x05
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#define SERIO_MZP 0x06
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#define SERIO_MZPP 0x07
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#define SERIO_VSXXXAA 0x08
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#define SERIO_SUNKBD 0x10
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#define SERIO_WARRIOR 0x18
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#define SERIO_SPACEORB 0x19
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#define SERIO_MAGELLAN 0x1a
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#define SERIO_SPACEBALL 0x1b
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#define SERIO_GUNZE 0x1c
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#define SERIO_IFORCE 0x1d
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#define SERIO_STINGER 0x1e
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#define SERIO_NEWTON 0x1f
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#define SERIO_STOWAWAY 0x20
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#define SERIO_H3600 0x21
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#define SERIO_PS2SER 0x22
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#define SERIO_TWIDKBD 0x23
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#define SERIO_TWIDJOY 0x24
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#define SERIO_HIL 0x25
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#define SERIO_SNES232 0x26
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#define SERIO_SEMTECH 0x27
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#define SERIO_LKKBD 0x28
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#define SERIO_ELO 0x29
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#define SERIO_MICROTOUCH 0x30
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#define SERIO_PENMOUNT 0x31
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#define SERIO_TOUCHRIGHT 0x32
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#define SERIO_TOUCHWIN 0x33
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#define SERIO_TAOSEVM 0x34
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#define SERIO_FUJITSU 0x35
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#define SERIO_ZHENHUA 0x36
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#define SERIO_INEXIO 0x37
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#define SERIO_TOUCHIT213 0x38
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#define SERIO_W8001 0x39
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#define SERIO_DYNAPRO 0x3a
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#define SERIO_HAMPSHIRE 0x3b
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#define SERIO_PS2MULT 0x3c
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#define SERIO_TSC40 0x3d
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#endif
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