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linux/drivers/input/misc/ideapad_slidebar.c
Thomas Gleixner 2874c5fd28 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:32 -07:00

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");