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353 lines
8.0 KiB
353 lines
8.0 KiB
// 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 <[email protected]> |
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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 <[email protected]>"); |
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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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