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