Input: add RAVE SP Powerbutton driver

Add driver that properly handles input event emitted by RAVE SP
devices.

Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

3 files changed, 104 insertions, 0 deletions

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 62a1312a7387..6a3c753b093b 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -841,4 +841,13 @@ config INPUT_HISI_POWERKEY
           To compile this driver as a module, choose M here: the
           module will be called hisi_powerkey.
 
+config INPUT_RAVE_SP_PWRBUTTON
+        tristate "RAVE SP Power button Driver"
+        depends on RAVE_SP_CORE
+        help
+          Say Y here if you want to enable power key reporting from RAVE SP
+
+          To compile this driver as a module, choose M here: the
+          module will be called rave-sp-pwrbutton.
+
 endif
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index a8f61af865aa..8cc58f362bb8 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -60,6 +60,7 @@ obj-$(CONFIG_INPUT_PMIC8XXX_PWRKEY)	+= pmic8xxx-pwrkey.o
 obj-$(CONFIG_INPUT_POWERMATE)           += powermate.o
 obj-$(CONFIG_INPUT_PWM_BEEPER)          += pwm-beeper.o
 obj-$(CONFIG_INPUT_PWM_VIBRA)           += pwm-vibra.o
+obj-$(CONFIG_INPUT_RAVE_SP_PWRBUTTON)   += rave-sp-pwrbutton.o
 obj-$(CONFIG_INPUT_RB532_BUTTON)        += rb532_button.o
 obj-$(CONFIG_INPUT_REGULATOR_HAPTIC)    += regulator-haptic.o
 obj-$(CONFIG_INPUT_RETU_PWRBUTTON)      += retu-pwrbutton.o
diff --git a/drivers/input/misc/rave-sp-pwrbutton.c b/drivers/input/misc/rave-sp-pwrbutton.c
new file mode 100644
index 000000000000..bcab3cdb7ebd
--- /dev/null
+++ b/drivers/input/misc/rave-sp-pwrbutton.c
@@ -0,0 +1,94 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// Power Button driver for RAVE SP
+//
+// Copyright (C) 2017 Zodiac Inflight Innovations
+//
+//
+
+#include <linux/input.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mfd/rave-sp.h>
+#include <linux/platform_device.h>
+
+#define RAVE_SP_EVNT_BUTTON_PRESS       (RAVE_SP_EVNT_BASE + 0x00)
+
+struct rave_sp_power_button {
+        struct input_dev *idev;
+        struct notifier_block nb;
+};
+
+static int rave_sp_power_button_event(struct notifier_block *nb,
+                                      unsigned long action, void *data)
+{
+        struct rave_sp_power_button *pb =
+                container_of(nb, struct rave_sp_power_button, nb);
+        const u8 event = rave_sp_action_unpack_event(action);
+        const u8 value = rave_sp_action_unpack_value(action);
+        struct input_dev *idev = pb->idev;
+
+        if (event == RAVE_SP_EVNT_BUTTON_PRESS) {
+                input_report_key(idev, KEY_POWER, value);
+                input_sync(idev);
+
+                return NOTIFY_STOP;
+        }
+
+        return NOTIFY_DONE;
+}
+
+static int rave_sp_pwrbutton_probe(struct platform_device *pdev)
+{
+        struct device *dev = &pdev->dev;
+        struct rave_sp_power_button *pb;
+        struct input_dev *idev;
+        int error;
+
+        pb = devm_kzalloc(dev, sizeof(*pb), GFP_KERNEL);
+        if (!pb)
+                return -ENOMEM;
+
+        idev = devm_input_allocate_device(dev);
+        if (!idev)
+                return -ENOMEM;
+
+        idev->name = pdev->name;
+
+        input_set_capability(idev, EV_KEY, KEY_POWER);
+
+        error = input_register_device(idev);
+        if (error)
+                return error;
+
+        pb->idev = idev;
+        pb->nb.notifier_call = rave_sp_power_button_event;
+        pb->nb.priority = 128;
+
+        error = devm_rave_sp_register_event_notifier(dev, &pb->nb);
+        if (error)
+                return error;
+
+        return 0;
+}
+
+static const struct of_device_id rave_sp_pwrbutton_of_match[] = {
+        { .compatible = "zii,rave-sp-pwrbutton" },
+        {}
+};
+
+static struct platform_driver rave_sp_pwrbutton_driver = {
+        .probe = rave_sp_pwrbutton_probe,
+        .driver = {
+                .name = KBUILD_MODNAME,
+                .of_match_table = rave_sp_pwrbutton_of_match,
+        },
+};
+module_platform_driver(rave_sp_pwrbutton_driver);
+
+MODULE_DEVICE_TABLE(of, rave_sp_pwrbutton_of_match);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Andrey Vostrikov <andrey.vostrikov@cogentembedded.com>");
+MODULE_AUTHOR("Nikita Yushchenko <nikita.yoush@cogentembedded.com>");
+MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
+MODULE_DESCRIPTION("RAVE SP Power Button driver");