6 files changed, 400 insertions, 24 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index 250dc970c62d..bd1c48ebce69 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4038,6 +4038,13 @@ W:	http://launchpad.net/ideapad-laptop
 S:      Maintained
 F:      drivers/platform/x86/ideapad-laptop.c
 
+IDEAPAD LAPTOP SLIDEBAR DRIVER
+M:      Andrey Moiseev <o2g.org.ru@gmail.com>
+L:      linux-input@vger.kernel.org
+W:      https://github.com/o2genum/ideapad-slidebar
+S:      Maintained
+F:      drivers/input/misc/ideapad_slidebar.c
+
 IDE/ATAPI DRIVERS
 M:      Borislav Petkov <bp@alien8.de>
 L:      linux-ide@vger.kernel.org
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 0b541cdf9b8e..aa51baaa9b1e 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -647,4 +647,14 @@ config INPUT_SIRFSOC_ONKEY
 
           If unsure, say N.
 
+config INPUT_IDEAPAD_SLIDEBAR
+        tristate "IdeaPad Laptop Slidebar"
+        depends on INPUT
+        depends on SERIO_I8042
+        help
+          Say Y here if you have an IdeaPad laptop with a slidebar.
+
+          To compile this driver as a module, choose M here: the
+          module will be called ideapad_slidebar.
+
 endif
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index 829de43a2427..0ebfb6dbf0f7 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -61,3 +61,4 @@ obj-$(CONFIG_INPUT_WISTRON_BTNS)	+= wistron_btns.o
 obj-$(CONFIG_INPUT_WM831X_ON)           += wm831x-on.o
 obj-$(CONFIG_INPUT_XEN_KBDDEV_FRONTEND) += xen-kbdfront.o
 obj-$(CONFIG_INPUT_YEALINK)             += yealink.o
+obj-$(CONFIG_INPUT_IDEAPAD_SLIDEBAR)    += ideapad_slidebar.o
diff --git a/drivers/input/misc/ideapad_slidebar.c b/drivers/input/misc/ideapad_slidebar.c
new file mode 100644
index 000000000000..edfd6239f131
--- /dev/null
+++ b/drivers/input/misc/ideapad_slidebar.c
@@ -0,0 +1,358 @@
+/*
+ * 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).
+ *
+ * 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 <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",
+                .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 <o2g.org.ru@gmail.com>");
+MODULE_DESCRIPTION("Slidebar input support for some Lenovo IdeaPad laptops");
+MODULE_LICENSE("GPL");
diff --git a/drivers/input/serio/i8042.h b/drivers/input/serio/i8042.h
index 3452708fbe3b..fc080beffedc 100644
--- a/drivers/input/serio/i8042.h
+++ b/drivers/input/serio/i8042.h
@@ -41,30 +41,6 @@
 #define I8042_CTL_TIMEOUT       10000
 
 /*
- * Status register bits.
- */
-
-#define I8042_STR_PARITY        0x80
-#define I8042_STR_TIMEOUT       0x40
-#define I8042_STR_AUXDATA       0x20
-#define I8042_STR_KEYLOCK       0x10
-#define I8042_STR_CMDDAT        0x08
-#define I8042_STR_MUXERR        0x04
-#define I8042_STR_IBF           0x02
-#define I8042_STR_OBF           0x01
-
-/*
- * Control register bits.
- */
-
-#define I8042_CTR_KBDINT        0x01
-#define I8042_CTR_AUXINT        0x02
-#define I8042_CTR_IGNKEYLOCK    0x08
-#define I8042_CTR_KBDDIS        0x10
-#define I8042_CTR_AUXDIS        0x20
-#define I8042_CTR_XLATE         0x40
-
-/*
  * Return codes.
  */
 
diff --git a/include/linux/i8042.h b/include/linux/i8042.h
index a986ff588944..0f9bafa17a02 100644
--- a/include/linux/i8042.h
+++ b/include/linux/i8042.h
@@ -31,6 +31,30 @@
 #define I8042_CMD_MUX_PFX       0x0090
 #define I8042_CMD_MUX_SEND      0x1090
 
+/*
+ * Status register bits.
+ */
+
+#define I8042_STR_PARITY        0x80
+#define I8042_STR_TIMEOUT       0x40
+#define I8042_STR_AUXDATA       0x20
+#define I8042_STR_KEYLOCK       0x10
+#define I8042_STR_CMDDAT        0x08
+#define I8042_STR_MUXERR        0x04
+#define I8042_STR_IBF           0x02
+#define I8042_STR_OBF           0x01
+
+/*
+ * Control register bits.
+ */
+
+#define I8042_CTR_KBDINT        0x01
+#define I8042_CTR_AUXINT        0x02
+#define I8042_CTR_IGNKEYLOCK    0x08
+#define I8042_CTR_KBDDIS        0x10
+#define I8042_CTR_AUXDIS        0x20
+#define I8042_CTR_XLATE         0x40
+
 struct serio;
 
 #if defined(CONFIG_SERIO_I8042) || defined(CONFIG_SERIO_I8042_MODULE)