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Date: Thu, 15 Aug 2013 19:06:39 +0400
From: Andrey Moiseev <o2g.org.ru@...il.com>
To: linux-input@...r.kernel.org
CC: dmitry.torokhov@...il.com, arnoques@...il.com,
russianneuromancer@...ru, ike.pan@...onical.com,
linux-kernel@...r.kernel.org
Subject: [PATCH v6 1/1] input: ideapad_slidebar: new input driver
v6: fixed things addressed by Dmitry Torokhov to v5 (quoted message goes below the patch)
ideapad_slidebar is a new driver which enables slidebars on some
Lenovo IdeaPad laptops (the slidebars work with SlideNav/Desktop
Navigator under Windows)
Fixes this: https://bugzilla.kernel.org/show_bug.cgi?id=16004
Registers 'IdeaPad Slidebar' input device and
/sys/devices/platform/ideapad_slidebar/input/inputX/slidebar_mode
for switching slidebar's modes.
Now works on:
IdeaPad Y550, Y550P.
May work on (testing and adding new models is needed):
Ideapad Y560, Y460, Y450, Y650,
and, probably, some others.
Driver source: https://github.com/o2genum/ideapad-slidebar.git
Patch is generated against current mainline kernel.
Signed-off-by: Andrey Moiseev <o2g.org.ru@...il.com>
---
MAINTAINERS | 7 +
drivers/input/misc/Kconfig | 9 +
drivers/input/misc/Makefile | 1 +
drivers/input/misc/ideapad_slidebar.c | 348 ++++++++++++++++++++++++++++++++++
4 files changed, 365 insertions(+)
create mode 100644 drivers/input/misc/ideapad_slidebar.c
diff --git a/MAINTAINERS b/MAINTAINERS
index defc053..2ff3dd8 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4096,6 +4096,13 @@ 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@...il.com>
+L: linux-input@...r.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@...en8.de>
L: linux-ide@...r.kernel.org
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 0b541cd..45729a9 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -647,4 +647,13 @@ config INPUT_SIRFSOC_ONKEY
If unsure, say N.
+config INPUT_IDEAPAD_SLIDEBAR
+ tristate "IdeaPad Laptop Slidebar"
+ depends on INPUT
+ help
+ Input driver for slidebars on some Lenovo IdeaPad laptops.
+
+ If you have an IdeaPad laptop with a slidebar, say Y or M here.
+ Module name is ideapad_slidebar.
+
endif
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index 829de43..0ebfb6d 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 0000000..5725d88
--- /dev/null
+++ b/drivers/input/misc/ideapad_slidebar.c
@@ -0,0 +1,348 @@
+/*
+ * Input driver for slidebars on some Lenovo IdeaPad laptops
+ *
+ * Copyright (C) 2013 Andrey Moiseev <o2g.org.ru@...il.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/input/inputX/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
+ */
+
+#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/i8042.h>
+
+static bool force;
+module_param(force, bool, 0);
+MODULE_PARM_DESC(force, "Force driver load, ignore DMI data");
+
+static spinlock_t sio_lock = __SPIN_LOCK_UNLOCKED(sio_lock);
+
+static struct input_dev *slidebar_input_dev;
+static struct platform_device *slidebar_platform_dev;
+
+/* Hardware interacting */
+static unsigned char slidebar_pos_get(void)
+{
+ int res;
+ unsigned long flags;
+
+ spin_lock_irqsave(&sio_lock, flags);
+ outb(0xf4, 0xff29);
+ outb(0xbf, 0xff2a);
+ res = inb(0xff2b);
+ spin_unlock_irqrestore(&sio_lock, flags);
+ return res;
+}
+
+static unsigned char slidebar_mode_get(void)
+{
+ int res;
+ unsigned long flags;
+
+ spin_lock_irqsave(&sio_lock, flags);
+ outb(0xf7, 0xff29);
+ outb(0x8b, 0xff2a);
+ res = inb(0xff2b);
+ spin_unlock_irqrestore(&sio_lock, flags);
+ return res;
+}
+
+static void slidebar_mode_set(unsigned char mode)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&sio_lock, flags);
+ outb(0xf7, 0xff29);
+ outb(0x8b, 0xff2a);
+ outb(mode, 0xff2b);
+ spin_unlock_irqrestore(&sio_lock, flags);
+}
+
+/* Listening the keyboard (i8042 filter) */
+static bool slidebar_i8042_filter(unsigned char data, unsigned char str,
+ struct serio *port)
+{
+ static bool extended = false, touched = false;
+
+ /* Scancodes: e03b on move, e0bb on release */
+ if (unlikely(data == 0xe0)) {
+ extended = true;
+ return false;
+ } else if (unlikely(extended && (data == 0x3b))) {
+ extended = false;
+ if (!touched)
+ input_report_key(slidebar_input_dev, BTN_TOUCH, 1);
+ touched = true;
+ input_report_abs(slidebar_input_dev, ABS_X, slidebar_pos_get());
+ input_sync(slidebar_input_dev);
+ return false;
+ } else if (unlikely(extended && (data == 0xbb))) {
+ touched = false;
+ input_report_key(slidebar_input_dev, BTN_TOUCH, 0);
+ input_sync(slidebar_input_dev);
+ }
+ return false;
+}
+
+/* Sysfs slidebar_mode interface */
+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)
+{
+ int mode;
+
+ if (!count)
+ return 0;
+ if (sscanf(buf, "%x", &mode) != 1)
+ return -EINVAL;
+ slidebar_mode_set(mode);
+ return count;
+}
+
+static DEVICE_ATTR(slidebar_mode, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH,
+ 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
+};
+
+/* Input device */
+static int __init setup_input_dev(void)
+{
+ int err;
+
+ slidebar_input_dev = input_allocate_device();
+ if (!slidebar_input_dev) {
+ pr_err("ideapad_slidebar: Not enough memory\n");
+ return -ENOMEM;
+ }
+
+ slidebar_input_dev->name = "IdeaPad Slidebar";
+ slidebar_input_dev->id.bustype = BUS_HOST;
+ slidebar_input_dev->dev.parent = &slidebar_platform_dev->dev;
+ slidebar_input_dev->dev.groups = ideapad_attr_groups;
+ 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) {
+ pr_err("ideapad_slidebar: Can't install i8042 filter \n");
+ goto err_free_dev;
+ }
+ err = input_register_device(slidebar_input_dev);
+ if (err) {
+ pr_err("ideapad_slidebar: Failed to register device\n");
+ goto err_remove_filter;
+ }
+ return 0;
+
+err_remove_filter:
+ i8042_remove_filter(slidebar_i8042_filter);
+err_free_dev:
+ input_free_device(slidebar_input_dev);
+ return err;
+}
+
+static void remove_input_dev(void)
+{
+ i8042_remove_filter(slidebar_i8042_filter);
+ input_unregister_device(slidebar_input_dev);
+}
+
+/* Platform device */
+static int __init setup_platform_dev(void)
+{
+ int err;
+ slidebar_platform_dev = platform_device_alloc("ideapad_slidebar", -1);
+ if (!slidebar_platform_dev) {
+ pr_err("ideapad_slidebar: Not enough memory\n");
+ return -ENOMEM;
+ }
+ err = platform_device_add(slidebar_platform_dev);
+ if (err) {
+ pr_err("ideapad_slidebar: Failed to register plarform device\n");
+ goto err_free_platform_device;
+ }
+ return 0;
+
+err_free_platform_device:
+ platform_device_put(slidebar_platform_dev);
+ return err;
+}
+
+/* Platform driver */
+static struct platform_driver slidebar_drv = {
+ .driver = {
+ .name = "ideapad_slidebar",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init register_platform_drv(void)
+{
+ int err;
+
+ err = platform_driver_register(&slidebar_drv);
+ if (err)
+ pr_err("ideapad_slidebar: Failed to register platform driver\n");
+
+ return err;
+}
+
+/* DMI */
+static int __init ideapad_dmi_check(const struct dmi_system_id *id)
+{
+ pr_info("ideapad_slidebar: 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);
+
+/* Init and cleanup */
+static int __init slidebar_init(void)
+{
+ int err;
+
+ if (!force && !dmi_check_system(ideapad_dmi))
+ return -ENODEV;
+ err = setup_platform_dev();
+ if (err)
+ return err;
+ err = register_platform_drv();
+ if (err)
+ goto err_unregister_platform_dev;
+ err = setup_input_dev();
+ if (err)
+ goto err_unregister_platform_drv;
+ return 0;
+
+err_unregister_platform_drv:
+ platform_driver_unregister(&slidebar_drv);
+err_unregister_platform_dev:
+ platform_device_unregister(slidebar_platform_dev);
+ return err;
+}
+
+static void __exit slidebar_exit(void)
+{
+ remove_input_dev();
+ 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@...il.com>");
+MODULE_DESCRIPTION("Slidebar input support for some Lenovo IdeaPad laptops");
+MODULE_LICENSE("GPL");
--
1.8.3.4
---
Quoted Re: to v5:
> Hi Andrey,
>
> On Mon, Aug 12, 2013 at 02:23:23PM +0400, Andrey Moiseev wrote:
>> v5: __initconst goes after var name
>>
>> ideapad_slidebar is a new driver which enables slidebars on some
>> Lenovo IdeaPad laptops (the slidebars work with SlideNav/Desktop
>> Navigator under Windows)
>>
>> Fixes this: https://bugzilla.kernel.org/show_bug.cgi?id=16004
>>
>> Registers 'IdeaPad Slidebar' input device and
>> /sys/devices/platform/ideapad_slidebar/slidebar_mode
>> for switching slidebar's modes.
>>
>> Now works on:
>> IdeaPad Y550, Y550P.
>>
>> May work on (testing and adding new models is needed):
>> Ideapad Y560, Y460, Y450, Y650,
>> and, probably, some others.
>>
>> Driver source: https://github.com/o2genum/ideapad-slidebar.git
>>
>> Patch is generated against current mainline kernel.
>>
>> Signed-off-by: Andrey Moiseev <o2g.org.ru@...il.com>
>> ---
>> MAINTAINERS | 7 +
>> drivers/input/misc/Kconfig | 9 +
>> drivers/input/misc/Makefile | 1 +
>> drivers/input/misc/ideapad_slidebar.c | 380 ++++++++++++++++++++++++++++++++++
>> 4 files changed, 397 insertions(+)
>> create mode 100644 drivers/input/misc/ideapad_slidebar.c
>>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index defc053..2ff3dd8 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -4096,6 +4096,13 @@ 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@...il.com>
>> +L: linux-input@...r.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@...en8.de>
>> L: linux-ide@...r.kernel.org
>> diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
>> index 0b541cd..45729a9 100644
>> --- a/drivers/input/misc/Kconfig
>> +++ b/drivers/input/misc/Kconfig
>> @@ -647,4 +647,13 @@ config INPUT_SIRFSOC_ONKEY
>>
>> If unsure, say N.
>>
>> +config INPUT_IDEAPAD_SLIDEBAR
>> + tristate "IdeaPad Laptop Slidebar"
>> + depends on INPUT
>> + help
>> + Input driver for slidebars on some Lenovo IdeaPad laptops.
>> +
>> + If you have an IdeaPad laptop with a slidebar, say Y or M here.
>> + Module name is ideapad_slidebar.
>> +
>> endif
>> diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
>> index 829de43..0ebfb6d 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 0000000..df437a4
>> --- /dev/null
>> +++ b/drivers/input/misc/ideapad_slidebar.c
>> @@ -0,0 +1,380 @@
>> +/*
>> + * Input driver for slidebars on some Lenovo IdeaPad laptops
>> + *
>> + * Copyright (C) 2013 Andrey Moiseev <o2g.org.ru@...il.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
>> + */
>> +
>> +#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/i8042.h>
>> +
>> +static bool force;
>> +module_param(force, bool, 0);
>> +MODULE_PARM_DESC(force, "Force driver load, ignore DMI data");
>> +
>> +static spinlock_t sio_lock = __SPIN_LOCK_UNLOCKED(sio_lock);
>> +
>> +static struct input_dev *slidebar_input_dev;
>> +static struct platform_device *slidebar_platform_dev;
>> +
>> +/* Hardware interacting */
>> +static int slidebar_pos_get(void)
>> +{
>> + int res;
>> + unsigned long flags;
>
> A blank line between variables and code is appreciated.
>
>> + spin_lock_irqsave(&sio_lock, flags);
>> + outb(0xf4, 0xff29);
>> + outb(0xbf, 0xff2a);
>> + res = inb(0xff2b);
>> + spin_unlock_irqrestore(&sio_lock, flags);
>> + return res;
>> +}
>> +
>> +static unsigned char slidebar_mode_get(void)
>> +{
>> + int res;
>> + unsigned long flags;
>> + spin_lock_irqsave(&sio_lock, flags);
>> + outb(0xf7, 0xff29);
>> + outb(0x8b, 0xff2a);
>> + res = inb(0xff2b);
>> + spin_unlock_irqrestore(&sio_lock, flags);
>> + return res;
>> +}
>> +
>> +static void slidebar_mode_set(unsigned char mode)
>> +{
>> + unsigned long flags;
>> + spin_lock_irqsave(&sio_lock, flags);
>> + outb(0xf7, 0xff29);
>> + outb(0x8b, 0xff2a);
>> + outb(mode, 0xff2b);
>> + spin_unlock_irqrestore(&sio_lock, flags);
>> +}
>> +
>> +/* Listening the keyboard (i8042 filter) */
>> +static bool slidebar_i8042_filter(unsigned char data, unsigned char str,
>> + struct serio *port)
>> +{
>> + static bool extended = false, touched = false;
>> +
>> + /* Scancodes: e03b on move, e0bb on release */
>> + if (unlikely(data == 0xe0)) {
>> + extended = true;
>> + return false;
>> + } else if (unlikely(extended && (data == 0x3b))) {
>> + extended = false;
>> + if (!touched)
>> + input_report_key(slidebar_input_dev, BTN_TOUCH, 1);
>> + touched = true;
>> + input_report_abs(slidebar_input_dev, ABS_X, slidebar_pos_get());
>> + input_sync(slidebar_input_dev);
>> + return false;
>> + } else if (unlikely(extended && (data == 0xbb))) {
>> + touched = false;
>> + input_report_key(slidebar_input_dev, BTN_TOUCH, 0);
>> + input_sync(slidebar_input_dev);
>> + }
>> +
>> + return false;
>> +}
>> +
>> +/* Input device */
>> +static int setup_input_dev(void)
>> +{
>> + int err;
>> +
>> + slidebar_input_dev = input_allocate_device();
>> + if (!slidebar_input_dev) {
>> + pr_err("ideapad_slidebar: Not enough memory\n");
>> + return -ENOMEM;
>> + }
>> +
>> + slidebar_input_dev->name = "IdeaPad Slidebar";
>> + slidebar_input_dev->id.bustype = BUS_HOST;
>> + slidebar_input_dev->dev.parent = &slidebar_platform_dev->dev;
>> + input_set_capability(slidebar_input_dev, EV_KEY, BTN_TOUCH);
>> + input_set_capability(slidebar_input_dev, EV_ABS, ABS_X);
>> + input_alloc_absinfo(slidebar_input_dev);
>
> This call is not needed, it will be done for you.
>
>> + input_set_abs_params(slidebar_input_dev, ABS_X, 0, 0xff, 0, 0);
>> +
>> + err = input_register_device(slidebar_input_dev);
>> + if (err) {
>> + pr_err("ideapad_slidebar: Failed to register device\n");
>> + goto err_free_dev;
>> + }
>> +
>> + err = i8042_install_filter(slidebar_i8042_filter);
>> + if (err) {
>> + pr_err("ideapad_slidebar: Can't install i8042 filter \n");
>> + goto err_unregister_dev;
>> + }
>> + return 0;
>> +
>> +err_unregister_dev:
>> + input_unregister_device(slidebar_input_dev);
>> +err_free_dev:
>> + input_free_device(slidebar_input_dev);
>
> No free after unregister for input devices. Consider swapping
> registering device and installing the filter (allocated but not
> registered input device can take events emitted by the filter just
> fine).
>
>> + return err;
>> +}
>> +
>> +static void remove_input_dev(void)
>> +{
>> + i8042_remove_filter(slidebar_i8042_filter);
>> + input_unregister_device(slidebar_input_dev);
>> + input_free_device(slidebar_input_dev);
>
> No free after unregister for input devices.
>
>> +}
>> +
>> +/* Sysfs slidebar_mode interface */
>> +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)
>> +{
>> + int mode;
>> + if (!count)
>> + return 0;
>> +
>> + if (sscanf(buf, "%x", &mode) != 1)
>> + return -EINVAL;
>> +
>> + slidebar_mode_set(mode);
>> + return count;
>> +}
>> +
>> +static DEVICE_ATTR(slidebar_mode, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH,
>> + show_slidebar_mode, store_slidebar_mode);
>> +
>> +static struct attribute *ideapad_attributes[] = {
>> + &dev_attr_slidebar_mode.attr,
>> + NULL
>> +};
>> +
>> +static struct attribute_group ideapad_attribute_group = {
>> + .attrs = ideapad_attributes
>> +};
>> +
>> +static int setup_slidebar_mode_dev(void)
>> +{
>> + return sysfs_create_group(&slidebar_platform_dev->dev.kobj,
>> + &ideapad_attribute_group);
>
> To avoid races between creating device and attributes you want to simply
> assign your group to the devices group pointer and then it will be
> created for you by device core.
>
>> +}
>> +
>> +static void remove_slidebar_mode_dev(void)
>> +{
>> + return sysfs_remove_group(&slidebar_platform_dev->dev.kobj,
>> + &ideapad_attribute_group);
>> +}
>> +
>> +/* Platform device */
>> +static int setup_platform_dev(void)
>> +{
>> + int err;
>> + slidebar_platform_dev = platform_device_alloc("ideapad_slidebar", -1);
>> + if (!slidebar_platform_dev) {
>> + pr_err("ideapad_slidebar: Not enough memory\n");
>> + return -ENOMEM;
>> + }
>> +
>> + err = platform_device_add(slidebar_platform_dev);
>> + if (err) {
>> + pr_err("ideapad_slidebar: Failed to register plarform device\n");
>> + goto err_free_platform_device;
>> + }
>> + return 0;
>> +
>> +err_free_platform_device:
>> + platform_device_put(slidebar_platform_dev);
>> + return err;
>> +}
>> +
>> +static void remove_platform_dev(void)
>> +{
>> + platform_device_del(slidebar_platform_dev);
>> + platform_device_put(slidebar_platform_dev);
>
> I do nto understand why you need all these wrappers when you can simply
> call platform_device_unregister().
>
>> +}
>> +
>> +/* Platform driver */
>> +static struct platform_driver slidebar_drv = {
>> + .driver = {
>> + .name = "ideapad_slidebar",
>> + .owner = THIS_MODULE,
>> + },
>> +};
>> +
>> +static int register_platform_drv(void)
>> +{
>> + int err;
>> + err = platform_driver_register(&slidebar_drv);
>> + if (err)
>> + pr_err("ideapad_slidebar: Failed to register platform driver\n");
>> +
>> + return err;
>> +}
>> +
>> +static void unregister_platform_drv(void)
>> +{
>> + platform_driver_unregister(&slidebar_drv);
>> +}
>> +
>> +/* DMI */
>> +static int ideapad_dmi_check(const struct dmi_system_id *id)
>> +{
>> + pr_info("ideapad_slidebar: Laptop model '%s'\n", id->ident);
>> + return 1;
>> +}
>> +
>> +static struct dmi_system_id ideapad_dmi_table[] __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
>> + },
>> + { }
>> +};
>> +
>> +/* Init and cleanup */
>> +static int __init slidebar_init(void)
>> +{
>> + int err;
>> +
>> + if (!force && !dmi_check_system(ideapad_dmi_table))
>> + return -ENODEV;
>> +
>> + err = setup_platform_dev();
>> + if (err)
>> + return err;
>> +
>> + err = register_platform_drv();
>> + if (err)
>> + goto err_remove_platform_dev;
>> +
>> + err = setup_input_dev();
>> + if (err)
>> + goto err_unregister_platform_drv;
>> +
>> + err = setup_slidebar_mode_dev();
>> + if (err)
>> + goto err_remove_input_dev;
>> + return 0;
>> +
>> +err_remove_input_dev:
>> + remove_input_dev();
>> +err_unregister_platform_drv:
>> + unregister_platform_drv();
>> +err_remove_platform_dev:
>> + remove_platform_dev();
>> + return err;
>> +}
>> +
>> +static void __exit slidebar_exit(void)
>> +{
>> + remove_slidebar_mode_dev();
>> + remove_input_dev();
>> + remove_platform_dev();
>> + unregister_platform_drv();
>> +}
>> +
>> +module_init(slidebar_init);
>> +module_exit(slidebar_exit);
>> +
>> +MODULE_AUTHOR("Andrey Moiseev <o2g.org.ru@...il.com>");
>> +MODULE_DESCRIPTION("Slidebar input support for some Lenovo IdeaPad laptops");
>> +MODULE_LICENSE("GPL");
>> +MODULE_VERSION("0.1");
>> +
>> +MODULE_ALIAS("dmi:*:svnLENOVO:pn20017:pvrLenovoIdeaPadY550:*");
>> +MODULE_ALIAS("dmi:*:svnLENOVO:pn20035:pvrLenovoIdeaPadY550P:*");
>
> Why not create MODULE_DEVICE_TABLE from dmi table instead of doing it by
> hand?
>
> Thanks.
>
> --
> Dmitry
--
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