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Subject[PATCH v2] platform/x86: peaq-wmi: Add new peaq-wmi driver
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PEAQ is a new European OEM, I've bought one of their 2-in-1 x86
devices, which is actually quite a nice device. Under Windows it has
Dolby software for "better" sound and you can select different equalizer
presets using a special button.

This WMI interface for this button is not really nice, as it does not do
notifies (it really does not I tripple checked), but since I had already
figured out the entire WMI interface for this I decided to go the full
mile anyways and also implent a WMI based input driver for this using
input_polldev since, well, we need to poll.

This commit adds support for this button making it report KEY_SOUND input
events. KEY_SOUND is already used in various places to switch sound into
theatre mode and things like that so it seems appropriate here.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
Changes in v2:
-Drop unneeded #include <linux/input.h>
-Add and use PEAQ_POLL_IGNORE_MS and PEAQ_POLL_MAX_MS defines
-Make globals static
-Call input_sync between reporting the button down and up
-Ignore events for at least 1 poll after an event even if the user has set
poll_interval > PEAQ_POLL_IGNORE_MS
---
drivers/platform/x86/Kconfig | 7 +++
drivers/platform/x86/Makefile | 1 +
drivers/platform/x86/peaq-wmi.c | 97 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 105 insertions(+)
create mode 100644 drivers/platform/x86/peaq-wmi.c

diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index be2ffbd6eb6c..2bac2b2644f9 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -660,6 +660,13 @@ config MSI_WMI
To compile this driver as a module, choose M here: the module will
be called msi-wmi.

+config PEAQ_WMI
+ tristate "PEAQ 2-in-1 WMI hotkey driver"
+ depends on ACPI_WMI
+ depends on INPUT
+ help
+ Say Y here if you want to support WMI-based hotkeys on PEAQ 2-in-1s.
+
config TOPSTAR_LAPTOP
tristate "Topstar Laptop Extras"
depends on ACPI
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index de4ffb594ba5..02487f95dd27 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -34,6 +34,7 @@ obj-$(CONFIG_PANASONIC_LAPTOP) += panasonic-laptop.o
obj-$(CONFIG_INTEL_MENLOW) += intel_menlow.o
obj-$(CONFIG_ACPI_WMI) += wmi.o
obj-$(CONFIG_MSI_WMI) += msi-wmi.o
+obj-$(CONFIG_PEAQ_WMI) += peaq-wmi.o
obj-$(CONFIG_SURFACE3_WMI) += surface3-wmi.o
obj-$(CONFIG_TOPSTAR_LAPTOP) += topstar-laptop.o

diff --git a/drivers/platform/x86/peaq-wmi.c b/drivers/platform/x86/peaq-wmi.c
new file mode 100644
index 000000000000..47b36b2fa895
--- /dev/null
+++ b/drivers/platform/x86/peaq-wmi.c
@@ -0,0 +1,97 @@
+/*
+ * PEAQ 2-in-1 WMI hotkey driver
+ * Copyright (C) 2017 Hans de Goede <hdegoede@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/acpi.h>
+#include <linux/input-polldev.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+#define PEAQ_DOLBY_BUTTON_GUID "ABBC0F6F-8EA1-11D1-00A0-C90629100000"
+#define PEAQ_DOLBY_BUTTON_METHOD_ID 5
+#define PEAQ_POLL_INTERVAL_MS 250
+#define PEAQ_POLL_IGNORE_MS 500
+#define PEAQ_POLL_MAX_MS 1000
+
+MODULE_ALIAS("wmi:"PEAQ_DOLBY_BUTTON_GUID);
+
+static struct input_polled_dev *peaq_poll_dev;
+static unsigned int peaq_ignore_events_counter;
+
+/*
+ * The Dolby button (yes really a Dolby button) causes an ACPI variable to get
+ * set on both press and release. The WMI method checks and clears that flag.
+ * So for a press + release we will get back One from the WMI method either once
+ * (if polling after the release) or twice (polling between press and release).
+ * We ignore events for 0.5s after the first event to avoid reporting 2 presses.
+ */
+static void peaq_wmi_poll(struct input_polled_dev *dev)
+{
+ union acpi_object obj;
+ struct acpi_buffer buffer = { sizeof(obj), &obj };
+ acpi_status status;
+
+ status = wmi_evaluate_method(PEAQ_DOLBY_BUTTON_GUID, 1,
+ PEAQ_DOLBY_BUTTON_METHOD_ID,
+ NULL, &buffer);
+ if (ACPI_FAILURE(status))
+ return;
+
+ if (obj.type != ACPI_TYPE_INTEGER) {
+ dev_err(&peaq_poll_dev->input->dev,
+ "Error WMBC did not return an integer\n");
+ return;
+ }
+
+ if (peaq_ignore_events_counter && --peaq_ignore_events_counter > 0)
+ return;
+
+ if (obj.integer.value) {
+ input_event(peaq_poll_dev->input, EV_KEY, KEY_SOUND, 1);
+ input_sync(peaq_poll_dev->input);
+ input_event(peaq_poll_dev->input, EV_KEY, KEY_SOUND, 0);
+ input_sync(peaq_poll_dev->input);
+ peaq_ignore_events_counter = max(1u,
+ PEAQ_POLL_IGNORE_MS / peaq_poll_dev->poll_interval);
+ }
+}
+
+static int __init peaq_wmi_init(void)
+{
+ if (!wmi_has_guid(PEAQ_DOLBY_BUTTON_GUID))
+ return -ENODEV;
+
+ peaq_poll_dev = input_allocate_polled_device();
+ if (!peaq_poll_dev)
+ return -ENOMEM;
+
+ peaq_poll_dev->poll = peaq_wmi_poll;
+ peaq_poll_dev->poll_interval = PEAQ_POLL_INTERVAL_MS;
+ peaq_poll_dev->poll_interval_max = PEAQ_POLL_MAX_MS;
+ peaq_poll_dev->input->name = "PEAQ WMI hotkeys";
+ peaq_poll_dev->input->phys = "wmi/input0";
+ peaq_poll_dev->input->id.bustype = BUS_HOST;
+ input_set_capability(peaq_poll_dev->input, EV_KEY, KEY_SOUND);
+
+ return input_register_polled_device(peaq_poll_dev);
+}
+
+static void __exit peaq_wmi_exit(void)
+{
+ if (!wmi_has_guid(PEAQ_DOLBY_BUTTON_GUID))
+ return;
+
+ input_unregister_polled_device(peaq_poll_dev);
+}
+
+module_init(peaq_wmi_init);
+module_exit(peaq_wmi_exit);
+
+MODULE_DESCRIPTION("PEAQ 2-in-1 WMI hotkey driver");
+MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
+MODULE_LICENSE("GPL");
--
2.12.2
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