3 files changed, 280 insertions, 0 deletions

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index ce785f481281..11ee05341926 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -249,6 +249,13 @@ config REGULATOR_LP8788
         help
           This driver supports LP8788 voltage regulator chip.
 
+config REGULATOR_MAX14577
+        tristate "Maxim 14577 regulator"
+        depends on MFD_MAX14577
+        help
+          This driver controls a Maxim 14577 regulator via I2C bus.
+          The regulators include safeout LDO and current regulator 'CHARGER'.
+
 config REGULATOR_MAX1586
         tristate "Maxim 1586/1587 voltage regulator"
         depends on I2C
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 01c597ea1744..654bd43a7426 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -35,6 +35,7 @@ obj-$(CONFIG_REGULATOR_LP872X) += lp872x.o
 obj-$(CONFIG_REGULATOR_LP8788) += lp8788-buck.o
 obj-$(CONFIG_REGULATOR_LP8788) += lp8788-ldo.o
 obj-$(CONFIG_REGULATOR_LP8755) += lp8755.o
+obj-$(CONFIG_REGULATOR_MAX14577) += max14577.o
 obj-$(CONFIG_REGULATOR_MAX1586) += max1586.o
 obj-$(CONFIG_REGULATOR_MAX8649) += max8649.o
 obj-$(CONFIG_REGULATOR_MAX8660) += max8660.o
diff --git a/drivers/regulator/max14577.c b/drivers/regulator/max14577.c
new file mode 100644
index 000000000000..516e8af05641
--- /dev/null
+++ b/drivers/regulator/max14577.c
@@ -0,0 +1,272 @@
+/*
+ * max14577.c - Regulator driver for the Maxim 14577
+ *
+ * Copyright (C) 2013 Samsung Electronics
+ * Krzysztof Kozlowski <k.kozlowski@samsung.com>
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/mfd/max14577.h>
+#include <linux/mfd/max14577-private.h>
+#include <linux/regulator/of_regulator.h>
+
+struct max14577_regulator {
+        struct device *dev;
+        struct max14577 *max14577;
+        struct regulator_dev **regulators;
+};
+
+static int max14577_reg_is_enabled(struct regulator_dev *rdev)
+{
+        int rid = rdev_get_id(rdev);
+        struct regmap *rmap = rdev->regmap;
+        u8 reg_data;
+
+        switch (rid) {
+        case MAX14577_CHARGER:
+                max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL2, &reg_data);
+                if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0)
+                        return 0;
+                max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, &reg_data);
+                if ((reg_data & STATUS3_CGMBC_MASK) == 0)
+                        return 0;
+                /* MBCHOSTEN and CGMBC are on */
+                return 1;
+        default:
+                return -EINVAL;
+        }
+}
+
+static int max14577_reg_get_current_limit(struct regulator_dev *rdev)
+{
+        u8 reg_data;
+        struct regmap *rmap = rdev->regmap;
+
+        if (rdev_get_id(rdev) != MAX14577_CHARGER)
+                return -EINVAL;
+
+        max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL4, &reg_data);
+
+        if ((reg_data & CHGCTRL4_MBCICHWRCL_MASK) == 0)
+                return MAX14577_REGULATOR_CURRENT_LIMIT_MIN;
+
+        reg_data = ((reg_data & CHGCTRL4_MBCICHWRCH_MASK) >>
+                        CHGCTRL4_MBCICHWRCH_SHIFT);
+        return MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START +
+                reg_data * MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP;
+}
+
+static int max14577_reg_set_current_limit(struct regulator_dev *rdev,
+                int min_uA, int max_uA)
+{
+        int i, current_bits = 0xf;
+        u8 reg_data;
+
+        if (rdev_get_id(rdev) != MAX14577_CHARGER)
+                return -EINVAL;
+
+        if (min_uA > MAX14577_REGULATOR_CURRENT_LIMIT_MAX ||
+                        max_uA < MAX14577_REGULATOR_CURRENT_LIMIT_MIN)
+                return -EINVAL;
+
+        if (max_uA < MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START) {
+                /* Less than 200 mA, so set 90mA (turn only Low Bit off) */
+                u8 reg_data = 0x0 << CHGCTRL4_MBCICHWRCL_SHIFT;
+                return max14577_update_reg(rdev->regmap,
+                                MAX14577_CHG_REG_CHG_CTRL4,
+                                CHGCTRL4_MBCICHWRCL_MASK, reg_data);
+        }
+
+        /* max_uA is in range: <LIMIT_HIGH_START, inifinite>, so search for
+         * valid current starting from LIMIT_MAX. */
+        for (i = MAX14577_REGULATOR_CURRENT_LIMIT_MAX;
+                        i >= MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START;
+                        i -= MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP) {
+                if (i <= max_uA)
+                        break;
+                current_bits--;
+        }
+        BUG_ON(current_bits < 0); /* Cannot happen */
+        /* Turn Low Bit on (use range 200mA-950 mA) */
+        reg_data = 0x1 << CHGCTRL4_MBCICHWRCL_SHIFT;
+        /* and set proper High Bits */
+        reg_data |= current_bits << CHGCTRL4_MBCICHWRCH_SHIFT;
+
+        return max14577_update_reg(rdev->regmap, MAX14577_CHG_REG_CHG_CTRL4,
+                        CHGCTRL4_MBCICHWRCL_MASK | CHGCTRL4_MBCICHWRCH_MASK,
+                        reg_data);
+}
+
+static struct regulator_ops max14577_safeout_ops = {
+        .is_enabled             = regulator_is_enabled_regmap,
+        .enable                 = regulator_enable_regmap,
+        .disable                = regulator_disable_regmap,
+        .list_voltage           = regulator_list_voltage_linear,
+};
+
+static struct regulator_ops max14577_charger_ops = {
+        .is_enabled             = max14577_reg_is_enabled,
+        .enable                 = regulator_enable_regmap,
+        .disable                = regulator_disable_regmap,
+        .get_current_limit      = max14577_reg_get_current_limit,
+        .set_current_limit      = max14577_reg_set_current_limit,
+};
+
+static const struct regulator_desc supported_regulators[] = {
+        [MAX14577_SAFEOUT] = {
+                .name           = "SAFEOUT",
+                .id             = MAX14577_SAFEOUT,
+                .ops            = &max14577_safeout_ops,
+                .type           = REGULATOR_VOLTAGE,
+                .owner          = THIS_MODULE,
+                .n_voltages     = 1,
+                .min_uV         = MAX14577_REGULATOR_SAFEOUT_VOLTAGE,
+                .enable_reg     = MAX14577_REG_CONTROL2,
+                .enable_mask    = CTRL2_SFOUTORD_MASK,
+        },
+        [MAX14577_CHARGER] = {
+                .name           = "CHARGER",
+                .id             = MAX14577_CHARGER,
+                .ops            = &max14577_charger_ops,
+                .type           = REGULATOR_CURRENT,
+                .owner          = THIS_MODULE,
+                .enable_reg     = MAX14577_CHG_REG_CHG_CTRL2,
+                .enable_mask    = CHGCTRL2_MBCHOSTEN_MASK,
+        },
+};
+
+#ifdef CONFIG_OF
+static struct of_regulator_match max14577_regulator_matches[] = {
+        { .name = "SAFEOUT", },
+        { .name = "CHARGER", },
+};
+
+static int max14577_regulator_dt_parse_pdata(struct platform_device *pdev)
+{
+        int ret;
+        struct device_node *np;
+
+        np = of_get_child_by_name(pdev->dev.parent->of_node, "regulators");
+        if (!np) {
+                dev_err(&pdev->dev, "Failed to get child OF node for regulators\n");
+                return -EINVAL;
+        }
+
+        ret = of_regulator_match(&pdev->dev, np, max14577_regulator_matches,
+                        MAX14577_REG_MAX);
+        if (ret < 0) {
+                dev_err(&pdev->dev, "Error parsing regulator init data: %d\n", ret);
+                return ret;
+        }
+
+        return 0;
+}
+
+static inline struct regulator_init_data *match_init_data(int index)
+{
+        return max14577_regulator_matches[index].init_data;
+}
+
+static inline struct device_node *match_of_node(int index)
+{
+        return max14577_regulator_matches[index].of_node;
+}
+#else /* CONFIG_OF */
+static int max14577_regulator_dt_parse_pdata(struct platform_device *pdev)
+{
+        return 0;
+}
+static inline struct regulator_init_data *match_init_data(int index)
+{
+        return NULL;
+}
+
+static inline struct device_node *match_of_node(int index)
+{
+        return NULL;
+}
+#endif /* CONFIG_OF */
+
+
+static int max14577_regulator_probe(struct platform_device *pdev)
+{
+        struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
+        struct max14577_platform_data *pdata = dev_get_platdata(max14577->dev);
+        int i, ret;
+        struct regulator_config config = {};
+
+        ret = max14577_regulator_dt_parse_pdata(pdev);
+        if (ret)
+                return ret;
+
+        config.dev = &pdev->dev;
+        config.regmap = max14577->regmap;
+
+        for (i = 0; i < ARRAY_SIZE(supported_regulators); i++) {
+                struct regulator_dev *regulator;
+                /*
+                 * Index of supported_regulators[] is also the id and must
+                 * match index of pdata->regulators[].
+                 */
+                if (pdata && pdata->regulators) {
+                        config.init_data = pdata->regulators[i].initdata;
+                        config.of_node = pdata->regulators[i].of_node;
+                } else {
+                        config.init_data = match_init_data(i);
+                        config.of_node = match_of_node(i);
+                }
+
+                regulator = devm_regulator_register(&pdev->dev,
+                                &supported_regulators[i], &config);
+                if (IS_ERR(regulator)) {
+                        ret = PTR_ERR(regulator);
+                        dev_err(&pdev->dev,
+                                        "Regulator init failed for ID %d with error: %d\n",
+                                        i, ret);
+                        return ret;
+                }
+        }
+
+        return ret;
+}
+
+static struct platform_driver max14577_regulator_driver = {
+        .driver = {
+                   .owner = THIS_MODULE,
+                   .name = "max14577-regulator",
+                   },
+        .probe  = max14577_regulator_probe,
+};
+
+static int __init max14577_regulator_init(void)
+{
+        BUILD_BUG_ON(MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START +
+                        MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP * 0xf !=
+                        MAX14577_REGULATOR_CURRENT_LIMIT_MAX);
+        BUILD_BUG_ON(ARRAY_SIZE(supported_regulators) != MAX14577_REG_MAX);
+
+        return platform_driver_register(&max14577_regulator_driver);
+}
+subsys_initcall(max14577_regulator_init);
+
+static void __exit max14577_regulator_exit(void)
+{
+        platform_driver_unregister(&max14577_regulator_driver);
+}
+module_exit(max14577_regulator_exit);
+
+MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski@samsung.com>");
+MODULE_DESCRIPTION("MAXIM 14577 regulator driver");
+MODULE_LICENSE("GPL");