/* * Input driver for slidebars on some Lenovo IdeaPad laptops * * Copyright (C) 2013 Andrey Moiseev * * Reverse-engineered from Lenovo SlideNav software (SBarHook.dll). * * 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. * * 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 #include #include #include #include #include #include #include #include #include #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", .owner = THIS_MODULE, }, .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 "); MODULE_DESCRIPTION("Slidebar input support for some Lenovo IdeaPad laptops"); MODULE_LICENSE("GPL");