twl6030: add power button as an input key

Signed-off-by: Vicente Bergas <vicencb@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

drivers/input/Kconfig

@@ -38,4 +38,11 @@ config KEYBOARD_QT1070
 	  Say Y here if you want to use Atmel AT42QT1070 QTouch
 	  Sensor chip as input device.
 
+config KEYBOARD_TWL6030
+	tristate "TWL6030 power button"
+	depends on MFD_TWL6030
+	select POLLER
+	help
+	  Say Y here if you want to use TWL6030 power button as a key.
+
 endmenu

drivers/input/Makefile

@@ -1,3 +1,4 @@
 obj-$(CONFIG_KEYBOARD_GPIO) += gpio_keys.o
+obj-$(CONFIG_KEYBOARD_TWL6030) += twl6030_pwrbtn.o
 obj-$(CONFIG_KEYBOARD_IMX_KEYPAD) += imx_keypad.o
 obj-$(CONFIG_KEYBOARD_QT1070) += qt1070.o

drivers/input/twl6030_pwrbtn.c

@@ -0,0 +1,108 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <common.h>
+#include <init.h>
+#include <malloc.h>
+#include <poller.h>
+#include <kfifo.h>
+#include <mfd/twl6030.h>
+#include <twl6030_pwrbtn.h>
+
+struct twl6030_pwrbtn_internal_data {
+	int code;
+	u8 previous_state;
+	struct twl6030 *twl6030;
+	struct kfifo *recv_fifo;
+	struct console_device cdev;
+	struct poller_struct poller;
+};
+
+#define PWR_PWRON_IRQ (1 << 0)
+
+static void ic2_key_poller(struct poller_struct *poller)
+{
+	struct twl6030_pwrbtn_internal_data *idata = container_of(
+		poller, struct twl6030_pwrbtn_internal_data, poller);
+	u8 val;
+
+	if (twl6030_reg_read(idata->twl6030, TWL6030_PMCM_HW, &val)) {
+		dev_err(idata->cdev.dev, "reading i2c\n");
+		return;
+	}
+	val = !(val & PWR_PWRON_IRQ);
+	if (val != idata->previous_state && val) {
+		kfifo_put(idata->recv_fifo, (u_char *)&idata->code,
+			sizeof(int));
+		dev_dbg(idata->cdev.dev, "pressed power button as %d\n",
+			idata->code);
+	}
+	idata->previous_state = val;
+}
+
+static int twl6030_pwrbtn_tstc(struct console_device *cdev)
+{
+	struct twl6030_pwrbtn_internal_data *idata = container_of(
+		cdev, struct twl6030_pwrbtn_internal_data, cdev);
+
+	return kfifo_len(idata->recv_fifo) ? 1 : 0;
+}
+
+static int twl6030_pwrbtn_getc(struct console_device *cdev)
+{
+	int code = 0;
+	struct twl6030_pwrbtn_internal_data *idata = container_of(
+		cdev, struct twl6030_pwrbtn_internal_data, cdev);
+
+	kfifo_get(idata->recv_fifo, (u_char *)&code, sizeof(int));
+	return code;
+}
+
+static int __init twl6030_pwrbtn_probe(struct device_d *dev)
+{
+	struct twl6030_pwrbtn_internal_data *idata;
+	struct twl6030_pwrbtn_platform_data *pdata;
+
+	pdata = dev->platform_data;
+	if (!pdata) {
+		dev_err(dev, "missing platform_data\n");
+		return -ENODEV;
+	}
+
+	idata = xzalloc(sizeof(struct twl6030_pwrbtn_internal_data));
+
+	idata->recv_fifo = kfifo_alloc(sizeof(int));
+	if (!idata->recv_fifo) {
+		dev_err(dev, "out of memory allocating kfifo\n");
+		free(idata);
+		return -ENOMEM;
+	}
+
+	idata->code = pdata->code;
+	idata->twl6030 = twl6030_get();
+	idata->poller.func = ic2_key_poller;
+
+	dev->type_data = &idata->cdev;
+	idata->cdev.dev = dev;
+	idata->cdev.f_caps = CONSOLE_STDIN;
+	idata->cdev.tstc = twl6030_pwrbtn_tstc;
+	idata->cdev.getc = twl6030_pwrbtn_getc;
+	console_register(&idata->cdev);
+
+	return poller_register(&idata->poller);
+}
+
+static struct driver_d twl6030_pwrbtn_driver = {
+	.name	= "twl6030_pwrbtn",
+	.probe	= twl6030_pwrbtn_probe,
+};
+device_platform_driver(twl6030_pwrbtn_driver);

include/twl6030_pwrbtn.h

@@ -0,0 +1,9 @@
+#ifndef _TWL6030_PWRBTN_H
+#define _TWL6030_PWRBTN_H
+
+struct twl6030_pwrbtn_platform_data {
+	/* key code */
+	int code;
+};
+
+#endif