led: max77660: add led driver

Add very basic led driver to disable leds for max77660.

Change-Id: I658308ad402157cf78728afa78470a9a9e8423d4
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviewed-on: http://git-master/r/194533

3 files changed, 102 insertions, 0 deletions

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index f6c6a5875d67..ae9296696316 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -24,6 +24,12 @@ config LEDS_CLASS
 
 comment "LED drivers"
 
+config LEDS_MAX77660
+	tristate "LED Support for Maxim MAX77660"
+	depends on LEDS_CLASS || MFD_MAX77660
+	help
+	  This option enables the led support for Maxim PMIC MAX77660.
+
 config LEDS_MAX8831
 	tristate "LED Support for Maxim MAX8831"
 	depends on LEDS_CLASS
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 22fc59fa8b2a..7472b7521ec9 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -53,6 +53,7 @@ obj-$(CONFIG_LEDS_NS2)			+= leds-ns2.o
 obj-$(CONFIG_LEDS_NETXBIG)		+= leds-netxbig.o
 obj-$(CONFIG_LEDS_ASIC3)		+= leds-asic3.o
 obj-$(CONFIG_LEDS_RENESAS_TPU)		+= leds-renesas-tpu.o
+obj-$(CONFIG_LEDS_MAX77660)		+= leds-max77660.o
 obj-$(CONFIG_LEDS_MAX8997)		+= leds-max8997.o
 obj-$(CONFIG_LEDS_LM355x)		+= leds-lm355x.o
 obj-$(CONFIG_LEDS_BLINKM)		+= leds-blinkm.o
diff --git a/drivers/leds/leds-max77660.c b/drivers/leds/leds-max77660.c
new file mode 100644
index 000000000000..3680436c95b4
--- /dev/null
+++ b/drivers/leds/leds-max77660.c
@@ -0,0 +1,95 @@
+/*
+ * leds-max77660.c -- MAXIM MAX77660 led driver.
+ *
+ * Copyright (c) 2013, NVIDIA Corporation.
+ *
+ * Author: Laxman Dewangan <ldewangan@nvidia.com>
+ *
+ * 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 version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
+ * whether express or implied; 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., 59 Temple Place, Suite 330, Boston, MA
+ * 02111-1307, USA
+ */
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/pm.h>
+#include <linux/mfd/max77660/max77660-core.h>
+
+struct max77660_leds {
+	struct device		*dev;
+	struct device		*parent;
+};
+
+static int max77660_disable_leds(struct max77660_leds *leds)
+{
+	int ret;
+
+	/* Disable LED driver by default */
+	ret = max77660_reg_write(leds->parent, MAX77660_PWR_SLAVE,
+			MAX77660_REG_LEDEN, 0x80);
+	if (ret < 0) {
+		dev_err(leds->dev, "LED write failed: %d\n", ret);
+		return ret;
+	}
+
+	ret = max77660_reg_write(leds->parent, MAX77660_PWR_SLAVE,
+			MAX77660_REG_LEDBLNK, 0x0);
+	if (ret < 0) {
+		dev_err(leds->dev, "LEDBLNK write failed: %d\n", ret);
+		return ret;
+	}
+	return 0;
+}
+
+static int max77660_leds_probe(struct platform_device *pdev)
+{
+	struct max77660_leds *leds;
+	struct max77660_platform_data *pdata;
+	int ret = 0;
+
+	pdata = dev_get_platdata(pdev->dev.parent);
+	if (!pdata) {
+		dev_err(&pdev->dev, "No Platform data\n");
+		return -EINVAL;
+	}
+
+	leds = devm_kzalloc(&pdev->dev, sizeof(*leds), GFP_KERNEL);
+	if (!leds) {
+		dev_err(&pdev->dev, "Memory allocation failed for leds\n");
+		return -ENOMEM;
+	}
+
+	leds->dev = &pdev->dev;
+	leds->parent = pdev->dev.parent;
+	dev_set_drvdata(&pdev->dev, leds);
+
+	if (pdata->led_disable)
+		ret = max77660_disable_leds(leds);
+	return ret;
+}
+
+static struct platform_driver max77660_leds_driver = {
+	.probe = max77660_leds_probe,
+	.driver = {
+		.name = "max77660-leds",
+		.owner = THIS_MODULE,
+	},
+};
+
+module_platform_driver(max77660_leds_driver);
+
+MODULE_DESCRIPTION("max77660 LEDs driver");
+MODULE_AUTHOR("Laxman Dewangan<ldewangan@nvidia.com>");
+MODULE_ALIAS("platform:max77660-leds");
+MODULE_LICENSE("GPL v2");