regulator: TPS65090: Add regulator support

Add regulator changes needed to support TPS65090.

bug 909648

Change-Id: Ia88e6706051f7a7e920b01c656f64385b98fc33a
Signed-off-by: venu byravarasu <vbyravarasu@nvidia.com>
Reviewed-on: http://git-master/r/73144
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviewed-on: http://git-master/r/74895
Reviewed-by: Varun Colbert <vcolbert@nvidia.com>
Tested-by: Varun Colbert <vcolbert@nvidia.com>

3 files changed, 207 insertions, 0 deletions

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index fe311c2af398..8f52d9c5117e 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -340,6 +340,12 @@ config REGULATOR_TPS6591X
 	help
 	  This driver supports TPS6591X voltage regulator chips.
 
+config REGULATOR_TPS65090
+	tristate "TI TPS65090 Power regulators"
+	depends on MFD_TPS65090
+	help
+	  This driver supports TPS65090 voltage regulator chips.
+
 config REGULATOR_TPS6236X
 	tristate "TI TPS6236X DC-DC core power suply regulators"
 	default n
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 3de5dafa0a0f..4337283ecc5a 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -30,6 +30,7 @@ obj-$(CONFIG_REGULATOR_WM8400) += wm8400-regulator.o
 obj-$(CONFIG_REGULATOR_WM8994) += wm8994-regulator.o
 obj-$(CONFIG_REGULATOR_TPS6586X) += tps6586x-regulator.o
 obj-$(CONFIG_REGULATOR_TPS6591X) += tps6591x-regulator.o
+obj-$(CONFIG_REGULATOR_TPS65090) += tps65090-regulator.o
 obj-$(CONFIG_REGULATOR_DA903X)	+= da903x.o
 obj-$(CONFIG_REGULATOR_PCF50633) += pcf50633-regulator.o
 obj-$(CONFIG_REGULATOR_PCAP) += pcap-regulator.o
diff --git a/drivers/regulator/tps65090-regulator.c b/drivers/regulator/tps65090-regulator.c
new file mode 100644
index 000000000000..8249a4b7ded2
--- /dev/null
+++ b/drivers/regulator/tps65090-regulator.c
@@ -0,0 +1,200 @@
+/*
+ * drivers/regulator/tps65090-regulator.c
+ *
+ * Regulator driver for tps65090 power management chip.
+ *
+ * Copyright (C) 2012 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/module.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/mfd/tps65090.h>
+#include <linux/regulator/tps65090-regulator.h>
+
+struct tps65090_regulator {
+	int		id;
+	/* Regulator register address.*/
+	u8		reg_en_reg;
+	u8		en_bit;
+
+	/* used by regulator core */
+	struct regulator_desc	desc;
+
+	/* Device */
+	struct device		*dev;
+};
+
+
+static inline struct device *to_tps65090_dev(struct regulator_dev *rdev)
+{
+	return rdev_get_dev(rdev)->parent->parent;
+}
+static int tps65090_reg_is_enabled(struct regulator_dev *rdev)
+{
+	struct tps65090_regulator *ri = rdev_get_drvdata(rdev);
+	struct device *parent = to_tps65090_dev(rdev);
+	uint8_t control;
+	int ret;
+
+	ret = tps65090_read(parent, ri->reg_en_reg, &control);
+	if (ret < 0) {
+		dev_err(&rdev->dev, "Error in reading reg 0x%x\n",
+			ri->reg_en_reg);
+		return ret;
+	}
+	return (((control >> ri->en_bit) & 1) == 1);
+}
+
+static int tps65090_reg_enable(struct regulator_dev *rdev)
+{
+	struct tps65090_regulator *ri = rdev_get_drvdata(rdev);
+	struct device *parent = to_tps65090_dev(rdev);
+	int ret;
+
+	ret = tps65090_set_bits(parent, ri->reg_en_reg, ri->en_bit);
+	if (ret < 0)
+		dev_err(&rdev->dev, "Error in updating reg 0x%x\n",
+			ri->reg_en_reg);
+	return ret;
+}
+
+static int tps65090_reg_disable(struct regulator_dev *rdev)
+{
+	struct tps65090_regulator *ri = rdev_get_drvdata(rdev);
+	struct device *parent = to_tps65090_dev(rdev);
+	int ret;
+
+	ret = tps65090_clr_bits(parent, ri->reg_en_reg, ri->en_bit);
+	if (ret < 0)
+		dev_err(&rdev->dev, "Error in updating reg 0x%x\n",
+			ri->reg_en_reg);
+
+	return ret;
+}
+
+static struct regulator_ops tps65090_ops = {
+	.enable		= tps65090_reg_enable,
+	.disable	= tps65090_reg_disable,
+	.is_enabled	= tps65090_reg_is_enabled,
+};
+
+#define tps65090_REG(_id, _en_reg, _en_bit, _ops)	\
+{							\
+	.reg_en_reg	= _en_reg,			\
+	.en_bit		= _en_bit,			\
+	.id		= TPS65090_ID_##_id,		\
+	.desc = {					\
+		.name = tps65090_rails(_id),		\
+		.id = TPS65090_ID_##_id,		\
+		.ops = &_ops,				\
+		.type = REGULATOR_VOLTAGE,		\
+		.owner = THIS_MODULE,			\
+	},						\
+}
+
+static struct tps65090_regulator TPS65090_regulator[] = {
+	tps65090_REG(DCDC1, 12, 0, tps65090_ops),
+	tps65090_REG(DCDC2, 13, 0, tps65090_ops),
+	tps65090_REG(DCDC3, 14, 0, tps65090_ops),
+	tps65090_REG(FET1,  15, 0, tps65090_ops),
+	tps65090_REG(FET2,  16, 0, tps65090_ops),
+	tps65090_REG(FET3,  17, 0, tps65090_ops),
+	tps65090_REG(FET4,  18, 0, tps65090_ops),
+	tps65090_REG(FET5,  19, 0, tps65090_ops),
+	tps65090_REG(FET6,  20, 0, tps65090_ops),
+	tps65090_REG(FET7,  21, 0, tps65090_ops),
+};
+static inline struct tps65090_regulator *find_regulator_info(int id)
+{
+	struct tps65090_regulator *ri;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(TPS65090_regulator); i++) {
+		ri = &TPS65090_regulator[i];
+		if (ri->desc.id == id)
+			return ri;
+	}
+	return NULL;
+}
+static int __devinit tps65090_regulator_probe(struct platform_device *pdev)
+{
+	struct tps65090_regulator *ri = NULL;
+	struct regulator_dev *rdev;
+	struct tps65090_regulator_platform_data *tps_pdata;
+	int id = pdev->id;
+
+	dev_dbg(&pdev->dev, "Probing regulator %d\n", id);
+
+	ri = find_regulator_info(id);
+	if (ri == NULL) {
+		dev_err(&pdev->dev, "invalid regulator ID specified\n");
+		return -EINVAL;
+	}
+	tps_pdata = pdev->dev.platform_data;
+	ri->dev = &pdev->dev;
+
+	rdev = regulator_register(&ri->desc, &pdev->dev,
+				&tps_pdata->regulator, ri);
+	if (IS_ERR_OR_NULL(rdev)) {
+		dev_err(&pdev->dev, "failed to register regulator %s\n",
+				ri->desc.name);
+		return PTR_ERR(rdev);
+	}
+
+	platform_set_drvdata(pdev, rdev);
+	return 0;
+}
+
+static int __devexit tps65090_regulator_remove(struct platform_device *pdev)
+{
+	struct regulator_dev *rdev = platform_get_drvdata(pdev);
+
+	regulator_unregister(rdev);
+	return 0;
+}
+
+static struct platform_driver tps65090_regulator_driver = {
+	.driver	= {
+		.name	= "tps65090-regulator",
+		.owner	= THIS_MODULE,
+	},
+	.probe		= tps65090_regulator_probe,
+	.remove		= __devexit_p(tps65090_regulator_remove),
+};
+
+static int __init tps65090_regulator_init(void)
+{
+	return platform_driver_register(&tps65090_regulator_driver);
+}
+subsys_initcall(tps65090_regulator_init);
+
+static void __exit tps65090_regulator_exit(void)
+{
+	platform_driver_unregister(&tps65090_regulator_driver);
+}
+module_exit(tps65090_regulator_exit);
+
+MODULE_DESCRIPTION("tps65090 regulator driver");
+MODULE_ALIAS("platform:tps65090-regulator");
+MODULE_LICENSE("GPL");