mfd: bd71828: Add power-key support

Use gpio_keys to send power input-event to user-space when power
button (short) press is detected.
Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/rohm-bd71828.c

@@ -4,7 +4,9 @@
 //
 // ROHM BD71828 PMIC driver
 
+#include <linux/gpio_keys.h>
 #include <linux/i2c.h>
+#include <linux/input.h>
 #include <linux/interrupt.h>
 #include <linux/ioport.h>
 #include <linux/irq.h>
@@ -15,6 +17,18 @@
 #include <linux/regmap.h>
 #include <linux/types.h>
 
+static struct gpio_keys_button button = {
+	.code = KEY_POWER,
+	.gpio = -1,
+	.type = EV_KEY,
+};
+
+static struct gpio_keys_platform_data bd71828_powerkey_data = {
+	.buttons = &button,
+	.nbuttons = 1,
+	.name = "bd71828-pwrkey",
+};
+
 static const struct resource rtc_irqs[] = {
 	DEFINE_RES_IRQ_NAMED(BD71828_INT_RTC0, "bd71828-rtc-alm-0"),
 	DEFINE_RES_IRQ_NAMED(BD71828_INT_RTC1, "bd71828-rtc-alm-1"),
@@ -35,6 +49,10 @@ static struct mfd_cell bd71828_mfd_cells[] = {
 		.name = "bd71828-rtc",
 		.resources = rtc_irqs,
 		.num_resources = ARRAY_SIZE(rtc_irqs),
+	}, {
+		.name = "gpio-keys",
+		.platform_data = &bd71828_powerkey_data,
+		.pdata_size = sizeof(bd71828_powerkey_data),
 	},
 };
 
@@ -288,6 +306,14 @@ static int bd71828_i2c_probe(struct i2c_client *i2c)
 	dev_dbg(&i2c->dev, "Registered %d IRQs for chip\n",
 		bd71828_irq_chip.num_irqs);
 
+	ret = regmap_irq_get_virq(irq_data, BD71828_INT_SHORTPUSH);
+	if (ret < 0) {
+		dev_err(&i2c->dev, "Failed to get the power-key IRQ\n");
+		return ret;
+	}
+
+	button.irq = ret;
+
 	ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO,
 				   bd71828_mfd_cells,
 				   ARRAY_SIZE(bd71828_mfd_cells), NULL, 0,