misc: MAX1749 vibrator motor driver

Bug 782956

Original-Change-Id: I0949eb5b40e75c7e9697787aba3d645dbe695cee
Reviewed-on: http://git-master/r/18167
Tested-by: Prashant Gaikwad <pgaikwad@nvidia.com>
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>
Tested-by: Bharat Nihalani <bnihalani@nvidia.com>

Rebase-Id: R45140872ef8a3804476c584ed307961559d3d169

3 files changed, 126 insertions, 0 deletions

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 9126675fc048..540b8d7f997f 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -520,6 +520,13 @@ config TEGRA_CRYPTO_DEV
 	Dev node /dev/tegra-crypto in order to get access to tegra aes
 	hardware from user space
 
+config MAX1749_VIBRATOR
+	bool "MAX1749 vibrator device driver"
+	depends on ANDROID_TIMED_OUTPUT
+	default n
+	---help---
+	Adds a timed output vibrator device node for MAX1749 vibrator motor
+
 source "drivers/misc/c2port/Kconfig"
 source "drivers/misc/eeprom/Kconfig"
 source "drivers/misc/cb710/Kconfig"
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index b717b7fe7c3f..7f8788e533a0 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -50,3 +50,4 @@ obj-$(CONFIG_USB_SWITCH_FSA9480) += fsa9480.o
 obj-$(CONFIG_SENSORS_NCT1008)	+= nct1008.o
 obj-$(CONFIG_BCM4329_RFKILL)	+= bcm4329_rfkill.o
 obj-$(CONFIG_TEGRA_CRYPTO_DEV)	+= tegra-cryptodev.o
+obj-$(CONFIG_MAX1749_VIBRATOR)	+= max1749.o
diff --git a/drivers/misc/max1749.c b/drivers/misc/max1749.c
new file mode 100644
index 000000000000..7f30c6f3db74
--- /dev/null
+++ b/drivers/misc/max1749.c
@@ -0,0 +1,118 @@
+/*
+ * drivers/misc/max1749.c
+ *
+ * Driver for MAX1749, vibrator motor driver.
+ *
+ * Copyright (c) 2011, NVIDIA Corporation.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#include <linux/regulator/consumer.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/err.h>
+#include <linux/hrtimer.h>
+#include <linux/delay.h>
+
+#include <../staging/android/timed_output.h>
+
+static struct regulator *regulator;
+static int timeout;
+
+static void vibrator_start(void)
+{
+	regulator_enable(regulator);
+}
+
+static void vibrator_stop(void)
+{
+	int ret;
+
+	ret = regulator_is_enabled(regulator);
+	if (ret > 0)
+		regulator_disable(regulator);
+}
+
+/*
+ * Timeout value can be changed from sysfs entry
+ * created by timed_output_dev.
+ * echo 100 > /sys/class/timed_output/vibrator/enable
+ */
+static void vibrator_enable(struct timed_output_dev *dev, int value)
+{
+	timeout = value;
+	if (!regulator)
+		return;
+
+	if (value) {
+		vibrator_start();
+		msleep(value);
+		vibrator_stop();
+	} else {
+		vibrator_stop();
+	}
+}
+
+/*
+ * Timeout value can be read from sysfs entry
+ * created by timed_output_dev.
+ * cat /sys/class/timed_output/vibrator/enable
+ */
+static int vibrator_get_time(struct timed_output_dev *dev)
+{
+	return timeout;
+}
+
+static struct timed_output_dev vibrator_dev = {
+	.name		= "vibrator",
+	.get_time	= vibrator_get_time,
+	.enable		= vibrator_enable,
+};
+
+static int __init vibrator_init(void)
+{
+	int status;
+
+	regulator = regulator_get(NULL, "vdd_vbrtr");
+	if (IS_ERR_OR_NULL(regulator)) {
+		pr_err("vibrator_init:Couldn't get regulator vdd_vbrtr\n");
+		regulator = NULL;
+		return PTR_ERR(regulator);
+	}
+
+	status = timed_output_dev_register(&vibrator_dev);
+
+	if (status) {
+		regulator_put(regulator);
+		regulator = NULL;
+	}
+	return status;
+}
+
+static void __exit vibrator_exit(void)
+{
+	if (regulator) {
+		timed_output_dev_unregister(&vibrator_dev);
+		regulator_put(regulator);
+		regulator = NULL;
+	}
+}
+
+MODULE_DESCRIPTION("timed output vibrator device");
+MODULE_AUTHOR("GPL");
+
+module_init(vibrator_init);
+module_exit(vibrator_exit);