[PATCH 2/3] input/keyboard: Add support for Dollar Cove TI power button

[Takashi Iwai]

This provides a new input driver for supporting the power button on
Dollar Cove TI PMIC, found on Cherrytrail-based devices.
The patch is based on the original work by Intel, found at:
  https://github.com/01org/ProductionKernelQuilts

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=193891
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
---
 drivers/input/keyboard/Kconfig        |  7 +++
 drivers/input/keyboard/Makefile       |  1 +
 drivers/input/keyboard/dc_ti_pwrbtn.c | 85 +++++++++++++++++++++++++++++++++++
 3 files changed, 93 insertions(+)
 create mode 100644 drivers/input/keyboard/dc_ti_pwrbtn.c

diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index 4c4ab1ced235..673748b3cc34 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -756,4 +756,11 @@ config KEYBOARD_BCM
 	  To compile this driver as a module, choose M here: the
 	  module will be called bcm-keypad.
 
+config KEYBOARD_DC_TI_PWRBTN
+	tristate "Dollar Cove TI power button driver"
+	depends on INTEL_SOC_PMIC_DC_TI
+	help
+	  Say Y here fi you want to have a power button driver for
+	  Dollar Cove TI PMIC.
+
 endif
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index d2338bacdad1..fa473d241e5c 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -66,3 +66,4 @@ obj-$(CONFIG_KEYBOARD_TM2_TOUCHKEY)	+= tm2-touchkey.o
 obj-$(CONFIG_KEYBOARD_TWL4030)		+= twl4030_keypad.o
 obj-$(CONFIG_KEYBOARD_XTKBD)		+= xtkbd.o
 obj-$(CONFIG_KEYBOARD_W90P910)		+= w90p910_keypad.o
+obj-$(CONFIG_KEYBOARD_DC_TI_PWRBTN)	+= dc_ti_pwrbtn.o
diff --git a/drivers/input/keyboard/dc_ti_pwrbtn.c b/drivers/input/keyboard/dc_ti_pwrbtn.c
new file mode 100644
index 000000000000..a0900a440c92
--- /dev/null
+++ b/drivers/input/keyboard/dc_ti_pwrbtn.c
@@ -0,0 +1,85 @@
+/*
+ * Power button driver for Dollar Cove TI PMIC
+ * Copyright (C) 2014 Intel Corp
+ * Copyright (c) 2017 Takashi Iwai <tiwai@xxxxxxx>
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/input.h>
+#include <linux/mfd/intel_soc_pmic.h>
+
+#define DC_TI_SIRQ_REG		0x3
+#define SIRQ_PWRBTN_REL		(1 << 0)
+
+#define DRIVER_NAME "dc_ti_pwrbtn"
+
+static irqreturn_t dc_ti_pwrbtn_interrupt(int irq, void *dev_id)
+{
+	struct input_dev *pwrbtn_input = dev_id;
+	struct device *dev = pwrbtn_input->dev.parent;
+	struct regmap *regmap = dev_get_drvdata(dev);
+	int state;
+
+	if (!regmap_read(regmap, DC_TI_SIRQ_REG, &state)) {
+		dev_dbg(dev, "SIRQ_REG=0x%x\n", state);
+		state &= SIRQ_PWRBTN_REL;
+		input_event(pwrbtn_input, EV_KEY, KEY_POWER, !state);
+		input_sync(pwrbtn_input);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int dc_ti_pwrbtn_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct intel_soc_pmic *pmic = dev_get_drvdata(dev->parent);
+	struct input_dev *pwrbtn_input;
+	int irq;
+	int ret;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return -EINVAL;
+	pwrbtn_input = devm_input_allocate_device(dev);
+	if (!pwrbtn_input)
+		return -ENOMEM;
+	pwrbtn_input->name = pdev->name;
+	pwrbtn_input->phys = "dc-ti-power/input0";
+	pwrbtn_input->id.bustype = BUS_HOST;
+	pwrbtn_input->dev.parent = dev;
+	input_set_capability(pwrbtn_input, EV_KEY, KEY_POWER);
+	ret = input_register_device(pwrbtn_input);
+	if (ret)
+		return ret;
+
+	dev_set_drvdata(dev, pmic->regmap);
+
+	ret = devm_request_threaded_irq(dev, irq, NULL, dc_ti_pwrbtn_interrupt,
+					0, KBUILD_MODNAME, pwrbtn_input);
+	if (ret)
+		return ret;
+
+	ret = enable_irq_wake(irq);
+	if (ret)
+		dev_warn(dev, "Can't enable IRQ as wake source: %d\n", ret);
+
+	return 0;
+}
+
+static struct platform_driver dc_ti_pwrbtn_driver = {
+	.driver = {
+		.name = DRIVER_NAME,
+	},
+	.probe	= dc_ti_pwrbtn_probe,
+};
+
+module_platform_driver(dc_ti_pwrbtn_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" DRIVER_NAME);
-- 
2.14.0