ENGR00124788-1 Add Linear PMIC support

Add Linear PMIC support.

Signed-off-by: Nancy Chen <Nancy.Chen@freescale.com>

3 files changed, 132 insertions, 0 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 92d59373b0cf..410497d638a3 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -347,6 +347,15 @@ config MFD_WM8994
 	  core support for the WM8994, in order to use the actual
 	  functionaltiy of the device other drivers must be enabled.
 
+config MFD_LTC3589
+	bool
+	depends on GENERIC_HARDIRQS
+
+config MFD_LTC3589_I2C
+	bool "Support for Linear LTC3589 with I2C"
+	select MFD_LTC3589
+	depends on I2C=y && GENERIC_HARDIRQS
+
 config MFD_PCF50633
 	tristate "Support for NXP PCF50633"
 	depends on I2C
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 3c4a3b53fafd..292123173bb9 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -29,6 +29,8 @@ obj-$(CONFIG_MFD_WM8350)	+= wm8350.o
 obj-$(CONFIG_MFD_WM8350_I2C)	+= wm8350-i2c.o
 obj-$(CONFIG_MFD_WM8994)	+= wm8994-core.o wm8994-irq.o
 
+obj-$(CONFIG_REGULATOR_LTC3589)	+= ltc3589-i2c.o
+
 obj-$(CONFIG_TPS65010)		+= tps65010.o
 obj-$(CONFIG_TPS6507X)		+= tps6507x.o
 obj-$(CONFIG_MENELAUS)		+= menelaus.o
diff --git a/drivers/mfd/ltc3589-i2c.c b/drivers/mfd/ltc3589-i2c.c
new file mode 100644
index 000000000000..db0017e30827
--- /dev/null
+++ b/drivers/mfd/ltc3589-i2c.c
@@ -0,0 +1,121 @@
+/*
+ * Copyright (C) 2010 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * 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.
+ */
+
+/*!
+ * @file ltc3589-i2c.c
+ * @brief This is the generic I2C driver for Linear 3589 PMIC.
+ *
+ * @ingroup PMIC_CORE
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/ltc3589/core.h>
+#include <linux/uaccess.h>
+#include <linux/slab.h>
+
+static inline int ltc3589_i2c_read(struct ltc3589 *ltc, u8 reg)
+{
+	return i2c_smbus_read_byte_data(ltc->i2c_client, reg);
+}
+
+static inline int ltc3589_i2c_write(struct ltc3589 *ltc, u8 reg, u8 val)
+{
+	return i2c_smbus_write_byte_data(ltc->i2c_client, reg, val);
+}
+
+static int ltc3589_i2c_probe(struct i2c_client *i2c,
+			    const struct i2c_device_id *id)
+{
+	struct ltc3589 *ltc3589;
+	struct ltc3589_platform_data *plat_data = i2c->dev.platform_data;
+	int ret = 0;
+
+	ltc3589 = kzalloc(sizeof(struct ltc3589), GFP_KERNEL);
+	if (ltc3589 == NULL)
+		return -ENOMEM;
+
+	i2c_set_clientdata(i2c, ltc3589);
+	ltc3589->dev = &i2c->dev;
+	ltc3589->i2c_client = i2c;
+	ltc3589->read_dev = ltc3589_i2c_read;
+	ltc3589->write_dev = ltc3589_i2c_write;
+
+	if (ltc3589_i2c_read(ltc3589, 0x33) < 0) {
+		kfree(ltc3589);
+		return -ENODEV;
+	}
+
+	/* so far, we got matched chip on board */
+
+	ltc3589_client = i2c;
+	if (plat_data && plat_data->init) {
+		ret = plat_data->init(ltc3589);
+		if (ret != 0)
+			return -EINVAL;
+	}
+
+	dev_info(&i2c->dev, "Loaded\n");
+
+	return 0;
+}
+
+static int ltc3589_i2c_remove(struct i2c_client *i2c)
+{
+	struct ltc3589 *ltc3589 = i2c_get_clientdata(i2c);
+
+	kfree(ltc3589);
+	return 0;
+}
+
+static const struct i2c_device_id ltc3589_id[] = {
+       { "ltc3589", 0 },
+       { }
+};
+MODULE_DEVICE_TABLE(i2c, ltc3589_id);
+
+
+static struct i2c_driver ltc3589_i2c_driver = {
+	.driver = {
+		   .name = "ltc3589",
+		   .owner = THIS_MODULE,
+	},
+	.probe = ltc3589_i2c_probe,
+	.remove = ltc3589_i2c_remove,
+	.id_table = ltc3589_id,
+};
+
+static int __init ltc3589_i2c_init(void)
+{
+	return i2c_add_driver(&ltc3589_i2c_driver);
+}
+/* init early so consumer devices can complete system boot */
+subsys_initcall(ltc3589_i2c_init);
+
+static void __exit ltc3589_i2c_exit(void)
+{
+	i2c_del_driver(&ltc3589_i2c_driver);
+}
+module_exit(ltc3589_i2c_exit);
+
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_DESCRIPTION("I2C support for the Linear PMIC");
+MODULE_LICENSE("GPL");