mirror of https://gitee.com/openkylin/linux.git
354 lines
8.0 KiB
C
354 lines
8.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Input driver for slidebars on some Lenovo IdeaPad laptops
|
|
*
|
|
* Copyright (C) 2013 Andrey Moiseev <o2g.org.ru@gmail.com>
|
|
*
|
|
* Reverse-engineered from Lenovo SlideNav software (SBarHook.dll).
|
|
*
|
|
* Trademarks are the property of their respective owners.
|
|
*/
|
|
|
|
/*
|
|
* Currently tested and works on:
|
|
* Lenovo IdeaPad Y550
|
|
* Lenovo IdeaPad Y550P
|
|
*
|
|
* Other models can be added easily. To test,
|
|
* load with 'force' parameter set 'true'.
|
|
*
|
|
* LEDs blinking and input mode are managed via sysfs,
|
|
* (hex, unsigned byte value):
|
|
* /sys/devices/platform/ideapad_slidebar/slidebar_mode
|
|
*
|
|
* The value is in byte range, however, I only figured out
|
|
* how bits 0b10011001 work. Some other bits, probably,
|
|
* are meaningfull too.
|
|
*
|
|
* Possible states:
|
|
*
|
|
* STD_INT, ONMOV_INT, OFF_INT, LAST_POLL, OFF_POLL
|
|
*
|
|
* Meaning:
|
|
* released touched
|
|
* STD 'heartbeat' lights follow the finger
|
|
* ONMOV no lights lights follow the finger
|
|
* LAST at last pos lights follow the finger
|
|
* OFF no lights no lights
|
|
*
|
|
* INT all input events are generated, interrupts are used
|
|
* POLL no input events by default, to get them,
|
|
* send 0b10000000 (read below)
|
|
*
|
|
* Commands: write
|
|
*
|
|
* All | 0b01001 -> STD_INT
|
|
* possible | 0b10001 -> ONMOV_INT
|
|
* states | 0b01000 -> OFF_INT
|
|
*
|
|
* | 0b0 -> LAST_POLL
|
|
* STD_INT or ONMOV_INT |
|
|
* | 0b1 -> STD_INT
|
|
*
|
|
* | 0b0 -> OFF_POLL
|
|
* OFF_INT or OFF_POLL |
|
|
* | 0b1 -> OFF_INT
|
|
*
|
|
* Any state | 0b10000000 -> if the slidebar has updated data,
|
|
* produce one input event (last position),
|
|
* switch to respective POLL mode
|
|
* (like 0x0), if not in POLL mode yet.
|
|
*
|
|
* Get current state: read
|
|
*
|
|
* masked by 0x11 read value means:
|
|
*
|
|
* 0x00 LAST
|
|
* 0x01 STD
|
|
* 0x10 OFF
|
|
* 0x11 ONMOV
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/dmi.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/input.h>
|
|
#include <linux/io.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/i8042.h>
|
|
#include <linux/serio.h>
|
|
|
|
#define IDEAPAD_BASE 0xff29
|
|
|
|
static bool force;
|
|
module_param(force, bool, 0);
|
|
MODULE_PARM_DESC(force, "Force driver load, ignore DMI data");
|
|
|
|
static DEFINE_SPINLOCK(io_lock);
|
|
|
|
static struct input_dev *slidebar_input_dev;
|
|
static struct platform_device *slidebar_platform_dev;
|
|
|
|
static u8 slidebar_pos_get(void)
|
|
{
|
|
u8 res;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&io_lock, flags);
|
|
outb(0xf4, 0xff29);
|
|
outb(0xbf, 0xff2a);
|
|
res = inb(0xff2b);
|
|
spin_unlock_irqrestore(&io_lock, flags);
|
|
|
|
return res;
|
|
}
|
|
|
|
static u8 slidebar_mode_get(void)
|
|
{
|
|
u8 res;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&io_lock, flags);
|
|
outb(0xf7, 0xff29);
|
|
outb(0x8b, 0xff2a);
|
|
res = inb(0xff2b);
|
|
spin_unlock_irqrestore(&io_lock, flags);
|
|
|
|
return res;
|
|
}
|
|
|
|
static void slidebar_mode_set(u8 mode)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&io_lock, flags);
|
|
outb(0xf7, 0xff29);
|
|
outb(0x8b, 0xff2a);
|
|
outb(mode, 0xff2b);
|
|
spin_unlock_irqrestore(&io_lock, flags);
|
|
}
|
|
|
|
static bool slidebar_i8042_filter(unsigned char data, unsigned char str,
|
|
struct serio *port)
|
|
{
|
|
static bool extended = false;
|
|
|
|
/* We are only interested in data coming form KBC port */
|
|
if (str & I8042_STR_AUXDATA)
|
|
return false;
|
|
|
|
/* Scancodes: e03b on move, e0bb on release. */
|
|
if (data == 0xe0) {
|
|
extended = true;
|
|
return true;
|
|
}
|
|
|
|
if (!extended)
|
|
return false;
|
|
|
|
extended = false;
|
|
|
|
if (likely((data & 0x7f) != 0x3b)) {
|
|
serio_interrupt(port, 0xe0, 0);
|
|
return false;
|
|
}
|
|
|
|
if (data & 0x80) {
|
|
input_report_key(slidebar_input_dev, BTN_TOUCH, 0);
|
|
} else {
|
|
input_report_key(slidebar_input_dev, BTN_TOUCH, 1);
|
|
input_report_abs(slidebar_input_dev, ABS_X, slidebar_pos_get());
|
|
}
|
|
input_sync(slidebar_input_dev);
|
|
|
|
return true;
|
|
}
|
|
|
|
static ssize_t show_slidebar_mode(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
return sprintf(buf, "%x\n", slidebar_mode_get());
|
|
}
|
|
|
|
static ssize_t store_slidebar_mode(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
u8 mode;
|
|
int error;
|
|
|
|
error = kstrtou8(buf, 0, &mode);
|
|
if (error)
|
|
return error;
|
|
|
|
slidebar_mode_set(mode);
|
|
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR(slidebar_mode, S_IWUSR | S_IRUGO,
|
|
show_slidebar_mode, store_slidebar_mode);
|
|
|
|
static struct attribute *ideapad_attrs[] = {
|
|
&dev_attr_slidebar_mode.attr,
|
|
NULL
|
|
};
|
|
|
|
static struct attribute_group ideapad_attr_group = {
|
|
.attrs = ideapad_attrs
|
|
};
|
|
|
|
static const struct attribute_group *ideapad_attr_groups[] = {
|
|
&ideapad_attr_group,
|
|
NULL
|
|
};
|
|
|
|
static int __init ideapad_probe(struct platform_device* pdev)
|
|
{
|
|
int err;
|
|
|
|
if (!request_region(IDEAPAD_BASE, 3, "ideapad_slidebar")) {
|
|
dev_err(&pdev->dev, "IO ports are busy\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
slidebar_input_dev = input_allocate_device();
|
|
if (!slidebar_input_dev) {
|
|
dev_err(&pdev->dev, "Failed to allocate input device\n");
|
|
err = -ENOMEM;
|
|
goto err_release_ports;
|
|
}
|
|
|
|
slidebar_input_dev->name = "IdeaPad Slidebar";
|
|
slidebar_input_dev->id.bustype = BUS_HOST;
|
|
slidebar_input_dev->dev.parent = &pdev->dev;
|
|
input_set_capability(slidebar_input_dev, EV_KEY, BTN_TOUCH);
|
|
input_set_capability(slidebar_input_dev, EV_ABS, ABS_X);
|
|
input_set_abs_params(slidebar_input_dev, ABS_X, 0, 0xff, 0, 0);
|
|
|
|
err = i8042_install_filter(slidebar_i8042_filter);
|
|
if (err) {
|
|
dev_err(&pdev->dev,
|
|
"Failed to install i8042 filter: %d\n", err);
|
|
goto err_free_dev;
|
|
}
|
|
|
|
err = input_register_device(slidebar_input_dev);
|
|
if (err) {
|
|
dev_err(&pdev->dev,
|
|
"Failed to register input device: %d\n", err);
|
|
goto err_remove_filter;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_remove_filter:
|
|
i8042_remove_filter(slidebar_i8042_filter);
|
|
err_free_dev:
|
|
input_free_device(slidebar_input_dev);
|
|
err_release_ports:
|
|
release_region(IDEAPAD_BASE, 3);
|
|
return err;
|
|
}
|
|
|
|
static int ideapad_remove(struct platform_device *pdev)
|
|
{
|
|
i8042_remove_filter(slidebar_i8042_filter);
|
|
input_unregister_device(slidebar_input_dev);
|
|
release_region(IDEAPAD_BASE, 3);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver slidebar_drv = {
|
|
.driver = {
|
|
.name = "ideapad_slidebar",
|
|
},
|
|
.remove = ideapad_remove,
|
|
};
|
|
|
|
static int __init ideapad_dmi_check(const struct dmi_system_id *id)
|
|
{
|
|
pr_info("Laptop model '%s'\n", id->ident);
|
|
return 1;
|
|
}
|
|
|
|
static const struct dmi_system_id ideapad_dmi[] __initconst = {
|
|
{
|
|
.ident = "Lenovo IdeaPad Y550",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "20017"),
|
|
DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo IdeaPad Y550")
|
|
},
|
|
.callback = ideapad_dmi_check
|
|
},
|
|
{
|
|
.ident = "Lenovo IdeaPad Y550P",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "20035"),
|
|
DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo IdeaPad Y550P")
|
|
},
|
|
.callback = ideapad_dmi_check
|
|
},
|
|
{ NULL, }
|
|
};
|
|
MODULE_DEVICE_TABLE(dmi, ideapad_dmi);
|
|
|
|
static int __init slidebar_init(void)
|
|
{
|
|
int err;
|
|
|
|
if (!force && !dmi_check_system(ideapad_dmi)) {
|
|
pr_err("DMI does not match\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
slidebar_platform_dev = platform_device_alloc("ideapad_slidebar", -1);
|
|
if (!slidebar_platform_dev) {
|
|
pr_err("Not enough memory\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
slidebar_platform_dev->dev.groups = ideapad_attr_groups;
|
|
|
|
err = platform_device_add(slidebar_platform_dev);
|
|
if (err) {
|
|
pr_err("Failed to register platform device\n");
|
|
goto err_free_dev;
|
|
}
|
|
|
|
err = platform_driver_probe(&slidebar_drv, ideapad_probe);
|
|
if (err) {
|
|
pr_err("Failed to register platform driver\n");
|
|
goto err_delete_dev;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_delete_dev:
|
|
platform_device_del(slidebar_platform_dev);
|
|
err_free_dev:
|
|
platform_device_put(slidebar_platform_dev);
|
|
return err;
|
|
}
|
|
|
|
static void __exit slidebar_exit(void)
|
|
{
|
|
platform_device_unregister(slidebar_platform_dev);
|
|
platform_driver_unregister(&slidebar_drv);
|
|
}
|
|
|
|
module_init(slidebar_init);
|
|
module_exit(slidebar_exit);
|
|
|
|
MODULE_AUTHOR("Andrey Moiseev <o2g.org.ru@gmail.com>");
|
|
MODULE_DESCRIPTION("Slidebar input support for some Lenovo IdeaPad laptops");
|
|
MODULE_LICENSE("GPL");
|