input: TWL4030 input support for power button, USB and charger

This adds support for detecting a few inputs exported by the TWL4030.
Currently-supported inputs are the power button, USB and charger presence.
Reviewed-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Paul Kocialkowski <contact@paulk.fr>

drivers/input/Makefile

@@ -7,6 +7,7 @@
 
 obj-$(CONFIG_I8042_KBD) += i8042.o
 obj-$(CONFIG_TEGRA_KEYBOARD) += tegra-kbc.o
+obj-$(CONFIG_TWL4030_INPUT) += twl4030.o
 obj-$(CONFIG_CROS_EC_KEYB) += cros_ec_keyb.o
 ifdef CONFIG_PS2KBD
 obj-y += keyboard.o pc_keyb.o

drivers/input/twl4030.c

@@ -0,0 +1,49 @@
+/*
+ * TWL4030 input
+ *
+ * Copyright (C) 2015 Paul Kocialkowski <contact@paulk.fr>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <twl4030.h>
+
+int twl4030_input_power_button(void)
+{
+	u8 data;
+
+	twl4030_i2c_read_u8(TWL4030_CHIP_PM_MASTER,
+			    TWL4030_PM_MASTER_STS_HW_CONDITIONS, &data);
+
+	if (data & TWL4030_PM_MASTER_STS_HW_CONDITIONS_PWON)
+		return 1;
+
+	return 0;
+}
+
+int twl4030_input_charger(void)
+{
+	u8 data;
+
+	twl4030_i2c_read_u8(TWL4030_CHIP_PM_MASTER,
+			    TWL4030_PM_MASTER_STS_HW_CONDITIONS, &data);
+
+	if (data & TWL4030_PM_MASTER_STS_HW_CONDITIONS_CHG)
+		return 1;
+
+	return 0;
+}
+
+int twl4030_input_usb(void)
+{
+	u8 data;
+
+	twl4030_i2c_read_u8(TWL4030_CHIP_PM_MASTER,
+			    TWL4030_PM_MASTER_STS_HW_CONDITIONS, &data);
+
+	if (data & TWL4030_PM_MASTER_STS_HW_CONDITIONS_USB ||
+	    data & TWL4030_PM_MASTER_STS_HW_CONDITIONS_VBUS)
+		return 1;
+
+	return 0;
+}

include/twl4030.h

@@ -208,6 +208,12 @@
 #define TWL4030_PM_MASTER_SW_EVENTS_DEVSLP		(1 << 1)
 #define TWL4030_PM_MASTER_SW_EVENTS_DEVOFF		(1 << 0)
 
+/* HW conditions */
+#define TWL4030_PM_MASTER_STS_HW_CONDITIONS_PWON	(1 << 0)
+#define TWL4030_PM_MASTER_STS_HW_CONDITIONS_CHG		(1 << 1)
+#define TWL4030_PM_MASTER_STS_HW_CONDITIONS_USB		(1 << 2)
+#define TWL4030_PM_MASTER_STS_HW_CONDITIONS_VBUS	(1 << 7)
+
 /* Power transition */
 #define TWL4030_PM_MASTER_CFG_TRANSITION_STARTON_PWON	(1 << 0)
 #define TWL4030_PM_MASTER_CFG_TRANSITION_STARTON_CHG	(1 << 1)
@@ -670,6 +676,14 @@ void twl4030_power_init(void);
 void twl4030_power_mmc_init(int dev_index);
 
 /*
+ * Input
+ */
+
+int twl4030_input_power_button(void);
+int twl4030_input_charger(void);
+int twl4030_input_usb(void);
+
+/*
  * LED
  */
 void twl4030_led_init(unsigned char ledon_mask);