diff options
Diffstat (limited to 'drivers/input/misc/ideapad_slidebar.c')
| -rw-r--r-- | drivers/input/misc/ideapad_slidebar.c | 353 |
1 files changed, 353 insertions, 0 deletions
diff --git a/drivers/input/misc/ideapad_slidebar.c b/drivers/input/misc/ideapad_slidebar.c new file mode 100644 index 000000000..68f1c584d --- /dev/null +++ b/drivers/input/misc/ideapad_slidebar.c @@ -0,0 +1,353 @@ +// 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"); |