[PATCH 1/2] mfd: act8945a: add Active-semi ACT8945A PMIC MFD driver

[Wenyou Yang <wenyou.yang@atmel.com>]

This patch adds support for the Active-semi ACT8945A PMIC.
It is a Multi Function Device with the following subdevices:
 - Regulator
 - Charger

It is interfaced to the host controller using I2C interface,
ACT8945A is a child device of the I2C.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
---

 drivers/mfd/Kconfig          |    8 +++
 drivers/mfd/Makefile         |    1 +
 drivers/mfd/act8945a.c       |  122 ++++++++++++++++++++++++++++++++++++++++++
 include/linux/mfd/act8945a.h |   25 +++++++++
 4 files changed, 156 insertions(+)
 create mode 100644 drivers/mfd/act8945a.c
 create mode 100644 include/linux/mfd/act8945a.h

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 9581ebb..018c72d 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -18,6 +18,14 @@ config MFD_CS5535
 	  This is the core driver for CS5535/CS5536 MFD functions.  This is
           necessary for using the board's GPIO and MFGPT functionality.
 
+config MFD_ACT8945A
+	bool "Active-semi ACT8945A"
+	select MFD_CORE
+	select REGMAP_I2C
+	depends on I2C && OF
+	help
+	  Support for the ACT8945A PMIC from Active-Semi
+
 config MFD_AS3711
 	bool "AMS AS3711"
 	select MFD_CORE
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 0f230a6..2f1ca82 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -6,6 +6,7 @@
 obj-$(CONFIG_MFD_88PM860X)	+= 88pm860x.o
 obj-$(CONFIG_MFD_88PM800)	+= 88pm800.o 88pm80x.o
 obj-$(CONFIG_MFD_88PM805)	+= 88pm805.o 88pm80x.o
+obj-$(CONFIG_MFD_ACT8945A)	+= act8945a.o
 obj-$(CONFIG_MFD_SM501)		+= sm501.o
 obj-$(CONFIG_MFD_ASIC3)		+= asic3.o tmio_core.o
 obj-$(CONFIG_MFD_BCM590XX)	+= bcm590xx.o
diff --git a/drivers/mfd/act8945a.c b/drivers/mfd/act8945a.c
new file mode 100644
index 0000000..b9b8685
--- /dev/null
+++ b/drivers/mfd/act8945a.c
@@ -0,0 +1,122 @@
+/*
+ * MFD driver for Active-semi ACT8945a PMIC
+ *
+ * Copyright (C) 2015 Atmel Corporation.
+ *                    Wenyou Yang <wenyou.yang@atmel.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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 <linux/i2c.h>
+#include <linux/mfd/act8945a.h>
+#include <linux/mfd/core.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+
+static const struct mfd_cell act8945a_devs[] = {
+	{
+		.name = "act8945a-pmic",
+		.of_compatible = "active-semi,act8945a-regulator",
+	},
+	{
+		.name = "act8945a-charger",
+		.of_compatible = "active-semi,act8945a-charger",
+	},
+};
+
+static const struct regmap_config act8945a_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+};
+
+static int act8945a_i2c_probe(struct i2c_client *client,
+			     const struct i2c_device_id *id)
+{
+	struct act8945a_dev *act8945a;
+	int ret;
+
+	act8945a = devm_kzalloc(&client->dev, sizeof(*act8945a), GFP_KERNEL);
+	if (act8945a == NULL)
+		return -ENOMEM;
+
+	i2c_set_clientdata(client, act8945a);
+
+	act8945a->dev = &client->dev;
+	act8945a->i2c_client = client;
+	act8945a->regmap = devm_regmap_init_i2c(client,
+						&act8945a_regmap_config);
+	if (IS_ERR(act8945a->regmap)) {
+		ret = PTR_ERR(act8945a->regmap);
+		dev_err(&client->dev, "regmap init failed: %d\n", ret);
+		return ret;
+	}
+
+	ret = mfd_add_devices(act8945a->dev, -1, act8945a_devs,
+			      ARRAY_SIZE(act8945a_devs), NULL, 0, NULL);
+	if (ret < 0) {
+		dev_err(&client->dev, "mfd_add_devices failed: %d\n", ret);
+		return ret;
+	}
+
+	dev_info(&client->dev, "added %zu mfd sub-devices\n",
+		 ARRAY_SIZE(act8945a_devs));
+
+	return 0;
+
+}
+
+static int act8945a_i2c_remove(struct i2c_client *i2c)
+{
+	struct act8945a_dev *act8945a = i2c_get_clientdata(i2c);
+
+	mfd_remove_devices(act8945a->dev);
+
+	return 0;
+}
+
+static const struct i2c_device_id act8945a_i2c_id[] = {
+	{ "act8945a", 0 },
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, act8945a_i2c_id);
+
+static const struct of_device_id act8945a_of_match[] = {
+	{.compatible = "active-semi,act8945a", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, act8945a_of_match);
+
+static struct i2c_driver act8945a_i2c_driver = {
+	.driver = {
+		   .name = "act8945a",
+		   .owner = THIS_MODULE,
+		   .of_match_table = of_match_ptr(act8945a_of_match),
+	},
+	.probe = act8945a_i2c_probe,
+	.remove = act8945a_i2c_remove,
+	.id_table = act8945a_i2c_id,
+};
+
+static int __init act8945a_i2c_init(void)
+{
+	return i2c_add_driver(&act8945a_i2c_driver);
+}
+subsys_initcall(act8945a_i2c_init);
+
+static void __exit act8945a_i2c_exit(void)
+{
+	i2c_del_driver(&act8945a_i2c_driver);
+}
+module_exit(act8945a_i2c_exit);
+
+MODULE_DESCRIPTION("ACT8945A PMIC multi-function driver");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>");
diff --git a/include/linux/mfd/act8945a.h b/include/linux/mfd/act8945a.h
new file mode 100644
index 0000000..5b18d16
--- /dev/null
+++ b/include/linux/mfd/act8945a.h
@@ -0,0 +1,25 @@
+/*
+ * MFD for Active-semi ACT8945A PMIC
+ *
+ * Copyright (C) 2015 Atmel Corporation.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ */
+
+#ifndef _LINUX_MFD_ACT8945A_H
+#define _LINUX_MFD_ACT8945A_H
+
+struct act8945a_dev {
+	struct device *dev;
+	struct i2c_client *i2c_client;
+	struct regmap *regmap;
+};
+
+#endif
-- 
1.7.9.5