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>

2 files changed, 50 insertions, 0 deletions

diff --git a/drivers/input/Makefile b/drivers/input/Makefile
index a8e9be2f7f..24fec9b83e 100644
--- a/drivers/input/Makefile
+++ b/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
diff --git a/drivers/input/twl4030.c b/drivers/input/twl4030.c
new file mode 100644
index 0000000000..a5ded35d92
--- /dev/null
+++ b/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;
+}