regulator: Add TPS65090 regulator driver

Add TPS65090 regulator driver

TPS65090 PMIC from TI consists of 3 step down converters,
2 always on LDOs and 7 current limited load switches. The
output voltages are ON/OFF controllable and are meant to
supply power to the components on target board.

Signed-off-by: Venu Byravarasu <vbyravarasu@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

3 files changed, 205 insertions, 0 deletions

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 36db5a441eba..ed37125b8877 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -294,6 +294,13 @@ config REGULATOR_TPS6507X
           three step-down converters and two general-purpose LDO voltage regulators.
           It supports TI's software based Class-2 SmartReflex implementation.
 
+config REGULATOR_TPS65090
+        tristate "TI TPS65090 Power regulator"
+        depends on MFD_TPS65090
+        help
+          This driver provides support for the voltage regulators on the
+          TI TPS65090 PMIC.
+
 config REGULATOR_TPS65217
         tristate "TI TPS65217 Power regulators"
         depends on MFD_TPS65217
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 94b52745e957..2cc91d1201db 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -40,6 +40,7 @@ obj-$(CONFIG_REGULATOR_TPS6105X) += tps6105x-regulator.o
 obj-$(CONFIG_REGULATOR_TPS62360) += tps62360-regulator.o
 obj-$(CONFIG_REGULATOR_TPS65023) += tps65023-regulator.o
 obj-$(CONFIG_REGULATOR_TPS6507X) += tps6507x-regulator.o
+obj-$(CONFIG_REGULATOR_TPS65090) += tps65090-regulator.o
 obj-$(CONFIG_REGULATOR_TPS65217) += tps65217-regulator.o
 obj-$(CONFIG_REGULATOR_TPS6524X) += tps6524x-regulator.o
 obj-$(CONFIG_REGULATOR_TPS6586X) += tps6586x-regulator.o
diff --git a/drivers/regulator/tps65090-regulator.c b/drivers/regulator/tps65090-regulator.c
new file mode 100644
index 000000000000..6c28e3a3f664
--- /dev/null
+++ b/drivers/regulator/tps65090-regulator.c
@@ -0,0 +1,197 @@
+/*
+ * Regulator driver for tps65090 power management chip.
+ *
+ * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
+
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+
+ * This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>
+ */
+
+#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, NULL);
+        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_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
+MODULE_LICENSE("GPL v2");