regulator: Add max8925 support

MAX8925 contains 3 Buck and 20 LDO regulator.

Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

3 files changed, 313 insertions, 0 deletions

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index dbfe31a4a519..04f2e085116a 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -94,6 +94,12 @@ config REGULATOR_MAX8660
           This driver controls a Maxim 8660/8661 voltage output
           regulator via I2C bus.
 
+config REGULATOR_MAX8925
+        tristate "Maxim MAX8925 Power Management IC"
+        depends on MFD_MAX8925
+        help
+          Say y here to support the voltage regulaltor of Maxim MAX8925 PMIC.
+
 config REGULATOR_TWL4030
         bool "TI TWL4030/TWL5030/TWL6030/TPS695x0 PMIC"
         depends on TWL4030_CORE
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index e845b66ad59c..4e7feece22d5 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_REGULATOR_MAX1586) += max1586.o
 obj-$(CONFIG_REGULATOR_TWL4030) += twl-regulator.o
 obj-$(CONFIG_REGULATOR_MAX8649) += max8649.o
 obj-$(CONFIG_REGULATOR_MAX8660) += max8660.o
+obj-$(CONFIG_REGULATOR_MAX8925) += max8925-regulator.o
 obj-$(CONFIG_REGULATOR_WM831X) += wm831x-dcdc.o
 obj-$(CONFIG_REGULATOR_WM831X) += wm831x-isink.o
 obj-$(CONFIG_REGULATOR_WM831X) += wm831x-ldo.o
diff --git a/drivers/regulator/max8925-regulator.c b/drivers/regulator/max8925-regulator.c
new file mode 100644
index 000000000000..67873f08ed40
--- /dev/null
+++ b/drivers/regulator/max8925-regulator.c
@@ -0,0 +1,306 @@
+/*
+ * Regulators driver for Maxim max8925
+ *
+ * Copyright (C) 2009 Marvell International Ltd.
+ *      Haojian Zhuang <haojian.zhuang@marvell.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/mfd/max8925.h>
+
+#define SD1_DVM_VMIN            850000
+#define SD1_DVM_VMAX            1000000
+#define SD1_DVM_STEP            50000
+#define SD1_DVM_SHIFT           5               /* SDCTL1 bit5 */
+#define SD1_DVM_EN              6               /* SDV1 bit 6 */
+
+struct max8925_regulator_info {
+        struct regulator_desc   desc;
+        struct regulator_dev    *regulator;
+        struct i2c_client       *i2c;
+        struct max8925_chip     *chip;
+
+        int     min_uV;
+        int     max_uV;
+        int     step_uV;
+        int     vol_reg;
+        int     vol_shift;
+        int     vol_nbits;
+        int     enable_bit;
+        int     enable_reg;
+};
+
+static inline int check_range(struct max8925_regulator_info *info,
+                              int min_uV, int max_uV)
+{
+        if (min_uV < info->min_uV || min_uV > info->max_uV)
+                return -EINVAL;
+
+        return 0;
+}
+
+static int max8925_list_voltage(struct regulator_dev *rdev, unsigned index)
+{
+        struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
+        return info->min_uV + index * info->step_uV;
+}
+
+static int max8925_set_voltage(struct regulator_dev *rdev,
+                               int min_uV, int max_uV)
+{
+        struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
+        unsigned char data, mask;
+
+        if (check_range(info, min_uV, max_uV)) {
+                dev_err(info->chip->dev, "invalid voltage range (%d, %d) uV\n",
+                        min_uV, max_uV);
+                return -EINVAL;
+        }
+        data = (min_uV - info->min_uV + info->step_uV - 1) / info->step_uV;
+        data <<= info->vol_shift;
+        mask = ((1 << info->vol_nbits) - 1) << info->vol_shift;
+
+        return max8925_set_bits(info->i2c, info->vol_reg, mask, data);
+}
+
+static int max8925_get_voltage(struct regulator_dev *rdev)
+{
+        struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
+        unsigned char data, mask;
+        int ret;
+
+        ret = max8925_reg_read(info->i2c, info->vol_reg);
+        if (ret < 0)
+                return ret;
+        mask = ((1 << info->vol_nbits) - 1) << info->vol_shift;
+        data = (ret & mask) >> info->vol_shift;
+
+        return max8925_list_voltage(rdev, data);
+}
+
+static int max8925_enable(struct regulator_dev *rdev)
+{
+        struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
+
+        return max8925_set_bits(info->i2c, info->enable_reg,
+                                1 << info->enable_bit,
+                                1 << info->enable_bit);
+}
+
+static int max8925_disable(struct regulator_dev *rdev)
+{
+        struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
+
+        return max8925_set_bits(info->i2c, info->enable_reg,
+                                1 << info->enable_bit, 0);
+}
+
+static int max8925_is_enabled(struct regulator_dev *rdev)
+{
+        struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
+        int ret;
+
+        ret = max8925_reg_read(info->i2c, info->vol_reg);
+        if (ret < 0)
+                return ret;
+
+        return ret & (1 << info->enable_bit);
+}
+
+static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV)
+{
+        struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
+        unsigned char data, mask;
+
+        if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX)
+                return -EINVAL;
+
+        data = (uV - SD1_DVM_VMIN + SD1_DVM_STEP - 1) / SD1_DVM_STEP;
+        data <<= SD1_DVM_SHIFT;
+        mask = 3 << SD1_DVM_SHIFT;
+
+        return max8925_set_bits(info->i2c, info->enable_reg, mask, data);
+}
+
+static int max8925_set_dvm_enable(struct regulator_dev *rdev)
+{
+        struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
+
+        return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN,
+                                1 << SD1_DVM_EN);
+}
+
+static int max8925_set_dvm_disable(struct regulator_dev *rdev)
+{
+        struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
+
+        return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0);
+}
+
+static struct regulator_ops max8925_regulator_sdv_ops = {
+        .set_voltage            = max8925_set_voltage,
+        .get_voltage            = max8925_get_voltage,
+        .enable                 = max8925_enable,
+        .disable                = max8925_disable,
+        .is_enabled             = max8925_is_enabled,
+        .set_suspend_voltage    = max8925_set_dvm_voltage,
+        .set_suspend_enable     = max8925_set_dvm_enable,
+        .set_suspend_disable    = max8925_set_dvm_disable,
+};
+
+static struct regulator_ops max8925_regulator_ldo_ops = {
+        .set_voltage            = max8925_set_voltage,
+        .get_voltage            = max8925_get_voltage,
+        .enable                 = max8925_enable,
+        .disable                = max8925_disable,
+        .is_enabled             = max8925_is_enabled,
+};
+
+#define MAX8925_SDV(_id, min, max, step)                        \
+{                                                               \
+        .desc   = {                                             \
+                .name   = "SDV" #_id,                           \
+                .ops    = &max8925_regulator_sdv_ops,           \
+                .type   = REGULATOR_VOLTAGE,                    \
+                .id     = MAX8925_ID_SD##_id,                   \
+                .owner  = THIS_MODULE,                          \
+        },                                                      \
+        .min_uV         = min * 1000,                           \
+        .max_uV         = max * 1000,                           \
+        .step_uV        = step * 1000,                          \
+        .vol_reg        = MAX8925_SDV##_id,                     \
+        .vol_shift      = 0,                                    \
+        .vol_nbits      = 6,                                    \
+        .enable_reg     = MAX8925_SDCTL##_id,                   \
+        .enable_bit     = 0,                                    \
+}
+
+#define MAX8925_LDO(_id, min, max, step)                        \
+{                                                               \
+        .desc   = {                                             \
+                .name   = "LDO" #_id,                           \
+                .ops    = &max8925_regulator_ldo_ops,           \
+                .type   = REGULATOR_VOLTAGE,                    \
+                .id     = MAX8925_ID_LDO##_id,                  \
+                .owner  = THIS_MODULE,                          \
+        },                                                      \
+        .min_uV         = min * 1000,                           \
+        .max_uV         = max * 1000,                           \
+        .step_uV        = step * 1000,                          \
+        .vol_reg        = MAX8925_LDOVOUT##_id,                 \
+        .vol_shift      = 0,                                    \
+        .vol_nbits      = 6,                                    \
+        .enable_reg     = MAX8925_LDOCTL##_id,                  \
+        .enable_bit     = 0,                                    \
+}
+
+static struct max8925_regulator_info max8925_regulator_info[] = {
+        MAX8925_SDV(1, 637.5, 1425, 12.5),
+        MAX8925_SDV(2,   650, 2225,   25),
+        MAX8925_SDV(3,   750, 3900,   50),
+
+        MAX8925_LDO(1,  750, 3900, 50),
+        MAX8925_LDO(2,  650, 2250, 25),
+        MAX8925_LDO(3,  650, 2250, 25),
+        MAX8925_LDO(4,  750, 3900, 50),
+        MAX8925_LDO(5,  750, 3900, 50),
+        MAX8925_LDO(6,  750, 3900, 50),
+        MAX8925_LDO(7,  750, 3900, 50),
+        MAX8925_LDO(8,  750, 3900, 50),
+        MAX8925_LDO(9,  750, 3900, 50),
+        MAX8925_LDO(10, 750, 3900, 50),
+        MAX8925_LDO(11, 750, 3900, 50),
+        MAX8925_LDO(12, 750, 3900, 50),
+        MAX8925_LDO(13, 750, 3900, 50),
+        MAX8925_LDO(14, 750, 3900, 50),
+        MAX8925_LDO(15, 750, 3900, 50),
+        MAX8925_LDO(16, 750, 3900, 50),
+        MAX8925_LDO(17, 650, 2250, 25),
+        MAX8925_LDO(18, 650, 2250, 25),
+        MAX8925_LDO(19, 750, 3900, 50),
+        MAX8925_LDO(20, 750, 3900, 50),
+};
+
+static inline struct max8925_regulator_info *find_regulator_info(int id)
+{
+        struct max8925_regulator_info *ri;
+        int i;
+
+        for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) {
+                ri = &max8925_regulator_info[i];
+                if (ri->desc.id == id)
+                        return ri;
+        }
+        return NULL;
+}
+
+static int __devinit max8925_regulator_probe(struct platform_device *pdev)
+{
+        struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
+        struct max8925_platform_data *pdata = chip->dev->platform_data;
+        struct max8925_regulator_info *ri = NULL;
+        struct regulator_dev *rdev;
+
+        ri = find_regulator_info(pdev->id);
+        if (ri == NULL) {
+                dev_err(&pdev->dev, "invalid regulator ID specified\n");
+                return -EINVAL;
+        }
+        ri->i2c = chip->i2c;
+        ri->chip = chip;
+
+        rdev = regulator_register(&ri->desc, &pdev->dev,
+                                  pdata->regulator[pdev->id], ri);
+        if (IS_ERR(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 max8925_regulator_remove(struct platform_device *pdev)
+{
+        struct regulator_dev *rdev = platform_get_drvdata(pdev);
+
+        regulator_unregister(rdev);
+        return 0;
+}
+
+static struct platform_driver max8925_regulator_driver = {
+        .driver         = {
+                .name   = "max8925-regulator",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = max8925_regulator_probe,
+        .remove         = __devexit_p(max8925_regulator_remove),
+};
+
+static int __init max8925_regulator_init(void)
+{
+        return platform_driver_register(&max8925_regulator_driver);
+}
+subsys_initcall(max8925_regulator_init);
+
+static void __exit max8925_regulator_exit(void)
+{
+        platform_driver_unregister(&max8925_regulator_driver);
+}
+module_exit(max8925_regulator_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
+MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC");
+MODULE_ALIAS("platform:max8925-regulator");
+