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linux/drivers/platform/x86/fujitsu-tablet.c
Dawei Li 6c0eb5ba35 ACPI: make remove callback of ACPI driver void 
For bus-based driver, device removal is implemented as:
1 device_remove()->
2   bus->remove()->
3     driver->remove()

Driver core needs no inform from callee(bus driver) about the
result of remove callback. In that case, commit fc7a6209d5
("bus: Make remove callback return void") forces bus_type::remove
be void-returned.

Now we have the situation that both 1 & 2 of calling chain are
void-returned, so it does not make much sense for 3(driver->remove)
to return non-void to its caller.

So the basic idea behind this change is making remove() callback of
any bus-based driver to be void-returned.

This change, for itself, is for device drivers based on acpi-bus.

Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Lee Jones <lee@kernel.org>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Dawei Li <set_pte_at@outlook.com>
Reviewed-by: Maximilian Luz <luzmaximilian@gmail.com>  # for drivers/platform/surface/*
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2022-11-23 19:11:22 +01:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2006-2012 Robert Gerlach <khnz@gmx.de>
* Copyright (C) 2005-2006 Jan Rychter <jan@rychter.com>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/bitops.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/acpi.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/delay.h>
#include <linux/dmi.h>
#define MODULENAME "fujitsu-tablet"
#define ACPI_FUJITSU_CLASS "fujitsu"
#define INVERT_TABLET_MODE_BIT 0x01
#define INVERT_DOCK_STATE_BIT 0x02
#define FORCE_TABLET_MODE_IF_UNDOCK 0x04
#define KEYMAP_LEN 16
static const struct acpi_device_id fujitsu_ids[] = {
{ .id = "FUJ02BD" },
{ .id = "FUJ02BF" },
{ .id = "" }
};
struct fujitsu_config {
unsigned short keymap[KEYMAP_LEN];
unsigned int quirks;
};
static unsigned short keymap_Lifebook_Tseries[KEYMAP_LEN] __initdata = {
KEY_RESERVED,
KEY_RESERVED,
KEY_RESERVED,
KEY_RESERVED,
KEY_SCROLLDOWN,
KEY_SCROLLUP,
KEY_ROTATE_DISPLAY,
KEY_LEFTCTRL,
KEY_BRIGHTNESSUP,
KEY_BRIGHTNESSDOWN,
KEY_BRIGHTNESS_ZERO,
KEY_RESERVED,
KEY_RESERVED,
KEY_RESERVED,
KEY_RESERVED,
KEY_LEFTALT
};
static unsigned short keymap_Lifebook_T901[KEYMAP_LEN] __initdata = {
KEY_RESERVED,
KEY_RESERVED,
KEY_RESERVED,
KEY_RESERVED,
KEY_SCROLLDOWN,
KEY_SCROLLUP,
KEY_CYCLEWINDOWS,
KEY_LEFTCTRL,
KEY_RESERVED,
KEY_RESERVED,
KEY_RESERVED,
KEY_RESERVED,
KEY_RESERVED,
KEY_RESERVED,
KEY_RESERVED,
KEY_LEFTMETA
};
static unsigned short keymap_Lifebook_T902[KEYMAP_LEN] __initdata = {
KEY_RESERVED,
KEY_VOLUMEDOWN,
KEY_VOLUMEUP,
KEY_CYCLEWINDOWS,
KEY_PROG1,
KEY_PROG2,
KEY_LEFTMETA,
KEY_RESERVED,
KEY_RESERVED,
KEY_RESERVED,
KEY_RESERVED,
KEY_RESERVED,
KEY_RESERVED,
KEY_RESERVED,
KEY_RESERVED,
KEY_RESERVED,
};
static unsigned short keymap_Lifebook_U810[KEYMAP_LEN] __initdata = {
KEY_RESERVED,
KEY_RESERVED,
KEY_RESERVED,
KEY_RESERVED,
KEY_PROG1,
KEY_PROG2,
KEY_ROTATE_DISPLAY,
KEY_RESERVED,
KEY_RESERVED,
KEY_RESERVED,
KEY_UP,
KEY_DOWN,
KEY_RESERVED,
KEY_RESERVED,
KEY_LEFTCTRL,
KEY_LEFTALT
};
static unsigned short keymap_Stylistic_Tseries[KEYMAP_LEN] __initdata = {
KEY_RESERVED,
KEY_RESERVED,
KEY_RESERVED,
KEY_RESERVED,
KEY_PRINT,
KEY_BACKSPACE,
KEY_SPACE,
KEY_ENTER,
KEY_BRIGHTNESSUP,
KEY_BRIGHTNESSDOWN,
KEY_DOWN,
KEY_UP,
KEY_SCROLLUP,
KEY_SCROLLDOWN,
KEY_LEFTCTRL,
KEY_LEFTALT
};
static unsigned short keymap_Stylistic_ST5xxx[KEYMAP_LEN] __initdata = {
KEY_RESERVED,
KEY_RESERVED,
KEY_RESERVED,
KEY_RESERVED,
KEY_MAIL,
KEY_ROTATE_DISPLAY,
KEY_ESC,
KEY_ENTER,
KEY_BRIGHTNESSUP,
KEY_BRIGHTNESSDOWN,
KEY_DOWN,
KEY_UP,
KEY_SCROLLUP,
KEY_SCROLLDOWN,
KEY_LEFTCTRL,
KEY_LEFTALT
};
static struct {
struct input_dev *idev;
struct fujitsu_config config;
unsigned long prev_keymask;
char phys[21];
int irq;
int io_base;
int io_length;
} fujitsu;
static u8 fujitsu_ack(void)
{
return inb(fujitsu.io_base + 2);
}
static u8 fujitsu_status(void)
{
return inb(fujitsu.io_base + 6);
}
static u8 fujitsu_read_register(const u8 addr)
{
outb(addr, fujitsu.io_base);
return inb(fujitsu.io_base + 4);
}
static void fujitsu_send_state(void)
{
int state;
int dock, tablet_mode;
state = fujitsu_read_register(0xdd);
dock = state & 0x02;
if (fujitsu.config.quirks & INVERT_DOCK_STATE_BIT)
dock = !dock;
if ((fujitsu.config.quirks & FORCE_TABLET_MODE_IF_UNDOCK) && (!dock)) {
tablet_mode = 1;
} else{
tablet_mode = state & 0x01;
if (fujitsu.config.quirks & INVERT_TABLET_MODE_BIT)
tablet_mode = !tablet_mode;
}
input_report_switch(fujitsu.idev, SW_DOCK, dock);
input_report_switch(fujitsu.idev, SW_TABLET_MODE, tablet_mode);
input_sync(fujitsu.idev);
}
static void fujitsu_reset(void)
{
int timeout = 50;
fujitsu_ack();
while ((fujitsu_status() & 0x02) && (--timeout))
msleep(20);
fujitsu_send_state();
}
static int input_fujitsu_setup(struct device *parent, const char *name,
const char *phys)
{
struct input_dev *idev;
int error;
int i;
idev = input_allocate_device();
if (!idev)
return -ENOMEM;
idev->dev.parent = parent;
idev->phys = phys;
idev->name = name;
idev->id.bustype = BUS_HOST;
idev->id.vendor = 0x1734; /* Fujitsu Siemens Computer GmbH */
idev->id.product = 0x0001;
idev->id.version = 0x0101;
idev->keycode = fujitsu.config.keymap;
idev->keycodesize = sizeof(fujitsu.config.keymap[0]);
idev->keycodemax = ARRAY_SIZE(fujitsu.config.keymap);
__set_bit(EV_REP, idev->evbit);
for (i = 0; i < ARRAY_SIZE(fujitsu.config.keymap); i++)
if (fujitsu.config.keymap[i])
input_set_capability(idev, EV_KEY, fujitsu.config.keymap[i]);
input_set_capability(idev, EV_MSC, MSC_SCAN);
input_set_capability(idev, EV_SW, SW_DOCK);
input_set_capability(idev, EV_SW, SW_TABLET_MODE);
error = input_register_device(idev);
if (error) {
input_free_device(idev);
return error;
}
fujitsu.idev = idev;
return 0;
}
static void input_fujitsu_remove(void)
{
input_unregister_device(fujitsu.idev);
}
static irqreturn_t fujitsu_interrupt(int irq, void *dev_id)
{
unsigned long keymask, changed;
unsigned int keycode;
int pressed;
int i;
if (unlikely(!(fujitsu_status() & 0x01)))
return IRQ_NONE;
fujitsu_send_state();
keymask = fujitsu_read_register(0xde);
keymask |= fujitsu_read_register(0xdf) << 8;
keymask ^= 0xffff;
changed = keymask ^ fujitsu.prev_keymask;
if (changed) {
fujitsu.prev_keymask = keymask;
for_each_set_bit(i, &changed, KEYMAP_LEN) {
keycode = fujitsu.config.keymap[i];
pressed = keymask & changed & BIT(i);
if (pressed)
input_event(fujitsu.idev, EV_MSC, MSC_SCAN, i);
input_report_key(fujitsu.idev, keycode, pressed);
input_sync(fujitsu.idev);
}
}
fujitsu_ack();
return IRQ_HANDLED;
}
static void __init fujitsu_dmi_common(const struct dmi_system_id *dmi)
{
pr_info("%s\n", dmi->ident);
memcpy(fujitsu.config.keymap, dmi->driver_data,
sizeof(fujitsu.config.keymap));
}
static int __init fujitsu_dmi_lifebook(const struct dmi_system_id *dmi)
{
fujitsu_dmi_common(dmi);
fujitsu.config.quirks |= INVERT_TABLET_MODE_BIT;
return 1;
}
static int __init fujitsu_dmi_stylistic(const struct dmi_system_id *dmi)
{
fujitsu_dmi_common(dmi);
fujitsu.config.quirks |= FORCE_TABLET_MODE_IF_UNDOCK;
fujitsu.config.quirks |= INVERT_DOCK_STATE_BIT;
return 1;
}
static const struct dmi_system_id dmi_ids[] __initconst = {
{
.callback = fujitsu_dmi_lifebook,
.ident = "Fujitsu Lifebook T901",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
DMI_MATCH(DMI_PRODUCT_NAME, "LifeBook T901")
},
.driver_data = keymap_Lifebook_T901
},
{
.callback = fujitsu_dmi_lifebook,
.ident = "Fujitsu Lifebook T901",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK T901")
},
.driver_data = keymap_Lifebook_T901
},
{
.callback = fujitsu_dmi_lifebook,
.ident = "Fujitsu Lifebook T902",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK T902")
},
.driver_data = keymap_Lifebook_T902
},
{
.callback = fujitsu_dmi_lifebook,
.ident = "Fujitsu Siemens P/T Series",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK")
},
.driver_data = keymap_Lifebook_Tseries
},
{
.callback = fujitsu_dmi_lifebook,
.ident = "Fujitsu Lifebook T Series",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
DMI_MATCH(DMI_PRODUCT_NAME, "LifeBook T")
},
.driver_data = keymap_Lifebook_Tseries
},
{
.callback = fujitsu_dmi_stylistic,
.ident = "Fujitsu Siemens Stylistic T Series",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
DMI_MATCH(DMI_PRODUCT_NAME, "Stylistic T")
},
.driver_data = keymap_Stylistic_Tseries
},
{
.callback = fujitsu_dmi_lifebook,
.ident = "Fujitsu LifeBook U810",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
DMI_MATCH(DMI_PRODUCT_NAME, "LifeBook U810")
},
.driver_data = keymap_Lifebook_U810
},
{
.callback = fujitsu_dmi_stylistic,
.ident = "Fujitsu Siemens Stylistic ST5xxx Series",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
DMI_MATCH(DMI_PRODUCT_NAME, "STYLISTIC ST5")
},
.driver_data = keymap_Stylistic_ST5xxx
},
{
.callback = fujitsu_dmi_stylistic,
.ident = "Fujitsu Siemens Stylistic ST5xxx Series",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
DMI_MATCH(DMI_PRODUCT_NAME, "Stylistic ST5")
},
.driver_data = keymap_Stylistic_ST5xxx
},
{
.callback = fujitsu_dmi_lifebook,
.ident = "Unknown (using defaults)",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, ""),
DMI_MATCH(DMI_PRODUCT_NAME, "")
},
.driver_data = keymap_Lifebook_Tseries
},
{ NULL }
};
static acpi_status fujitsu_walk_resources(struct acpi_resource *res, void *data)
{
switch (res->type) {
case ACPI_RESOURCE_TYPE_IRQ:
fujitsu.irq = res->data.irq.interrupts[0];
return AE_OK;
case ACPI_RESOURCE_TYPE_IO:
fujitsu.io_base = res->data.io.minimum;
fujitsu.io_length = res->data.io.address_length;
return AE_OK;
case ACPI_RESOURCE_TYPE_END_TAG:
if (fujitsu.irq && fujitsu.io_base)
return AE_OK;
else
return AE_NOT_FOUND;
default:
return AE_ERROR;
}
}
static int acpi_fujitsu_add(struct acpi_device *adev)
{
acpi_status status;
int error;
if (!adev)
return -EINVAL;
status = acpi_walk_resources(adev->handle, METHOD_NAME__CRS,
fujitsu_walk_resources, NULL);
if (ACPI_FAILURE(status) || !fujitsu.irq || !fujitsu.io_base)
return -ENODEV;
sprintf(acpi_device_name(adev), "Fujitsu %s", acpi_device_hid(adev));
sprintf(acpi_device_class(adev), "%s", ACPI_FUJITSU_CLASS);
snprintf(fujitsu.phys, sizeof(fujitsu.phys),
"%s/input0", acpi_device_hid(adev));
error = input_fujitsu_setup(&adev->dev,
acpi_device_name(adev), fujitsu.phys);
if (error)
return error;
if (!request_region(fujitsu.io_base, fujitsu.io_length, MODULENAME)) {
input_fujitsu_remove();
return -EBUSY;
}
fujitsu_reset();
error = request_irq(fujitsu.irq, fujitsu_interrupt,
IRQF_SHARED, MODULENAME, fujitsu_interrupt);
if (error) {
release_region(fujitsu.io_base, fujitsu.io_length);
input_fujitsu_remove();
return error;
}
return 0;
}
static void acpi_fujitsu_remove(struct acpi_device *adev)
{
free_irq(fujitsu.irq, fujitsu_interrupt);
release_region(fujitsu.io_base, fujitsu.io_length);
input_fujitsu_remove();
}
#ifdef CONFIG_PM_SLEEP
static int acpi_fujitsu_resume(struct device *dev)
{
fujitsu_reset();
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(acpi_fujitsu_pm, NULL, acpi_fujitsu_resume);
static struct acpi_driver acpi_fujitsu_driver = {
.name = MODULENAME,
.class = "hotkey",
.ids = fujitsu_ids,
.ops = {
.add = acpi_fujitsu_add,
.remove = acpi_fujitsu_remove,
},
.drv.pm = &acpi_fujitsu_pm,
};
static int __init fujitsu_module_init(void)
{
int error;
dmi_check_system(dmi_ids);
error = acpi_bus_register_driver(&acpi_fujitsu_driver);
if (error)
return error;
return 0;
}
static void __exit fujitsu_module_exit(void)
{
acpi_bus_unregister_driver(&acpi_fujitsu_driver);
}
module_init(fujitsu_module_init);
module_exit(fujitsu_module_exit);
MODULE_AUTHOR("Robert Gerlach <khnz@gmx.de>");
MODULE_DESCRIPTION("Fujitsu tablet pc extras driver");
MODULE_LICENSE("GPL");
MODULE_VERSION("2.5");
MODULE_DEVICE_TABLE(acpi, fujitsu_ids);
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