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+/*
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+ * max14577.c - Regulator driver for the Maxim 14577
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+ *
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+ * Copyright (C) 2013 Samsung Electronics
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+ * Krzysztof Kozlowski <k.kozlowski@samsung.com>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ */
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+
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+#include <linux/module.h>
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+#include <linux/platform_device.h>
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+#include <linux/regulator/driver.h>
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+#include <linux/mfd/max14577.h>
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+#include <linux/mfd/max14577-private.h>
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+#include <linux/regulator/of_regulator.h>
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+
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+struct max14577_regulator {
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+ struct device *dev;
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+ struct max14577 *max14577;
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+ struct regulator_dev **regulators;
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+};
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+
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+static int max14577_reg_is_enabled(struct regulator_dev *rdev)
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+{
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+ int rid = rdev_get_id(rdev);
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+ struct regmap *rmap = rdev->regmap;
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+ u8 reg_data;
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+
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+ switch (rid) {
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+ case MAX14577_CHARGER:
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+ max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL2, ®_data);
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+ if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0)
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+ return 0;
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+ max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, ®_data);
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+ if ((reg_data & STATUS3_CGMBC_MASK) == 0)
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+ return 0;
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+ /* MBCHOSTEN and CGMBC are on */
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+ return 1;
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+ default:
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+ return -EINVAL;
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+ }
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+}
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+
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+static int max14577_reg_get_current_limit(struct regulator_dev *rdev)
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+{
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+ u8 reg_data;
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+ struct regmap *rmap = rdev->regmap;
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+
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+ if (rdev_get_id(rdev) != MAX14577_CHARGER)
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+ return -EINVAL;
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+
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+ max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL4, ®_data);
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+
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+ if ((reg_data & CHGCTRL4_MBCICHWRCL_MASK) == 0)
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+ return MAX14577_REGULATOR_CURRENT_LIMIT_MIN;
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+
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+ reg_data = ((reg_data & CHGCTRL4_MBCICHWRCH_MASK) >>
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+ CHGCTRL4_MBCICHWRCH_SHIFT);
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+ return MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START +
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+ reg_data * MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP;
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+}
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+
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+static int max14577_reg_set_current_limit(struct regulator_dev *rdev,
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+ int min_uA, int max_uA)
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+{
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+ int i, current_bits = 0xf;
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+ u8 reg_data;
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+
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+ if (rdev_get_id(rdev) != MAX14577_CHARGER)
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+ return -EINVAL;
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+
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+ if (min_uA > MAX14577_REGULATOR_CURRENT_LIMIT_MAX ||
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+ max_uA < MAX14577_REGULATOR_CURRENT_LIMIT_MIN)
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+ return -EINVAL;
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+
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+ if (max_uA < MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START) {
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+ /* Less than 200 mA, so set 90mA (turn only Low Bit off) */
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+ u8 reg_data = 0x0 << CHGCTRL4_MBCICHWRCL_SHIFT;
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+ return max14577_update_reg(rdev->regmap,
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+ MAX14577_CHG_REG_CHG_CTRL4,
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+ CHGCTRL4_MBCICHWRCL_MASK, reg_data);
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+ }
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+
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+ /* max_uA is in range: <LIMIT_HIGH_START, inifinite>, so search for
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+ * valid current starting from LIMIT_MAX. */
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+ for (i = MAX14577_REGULATOR_CURRENT_LIMIT_MAX;
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+ i >= MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START;
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+ i -= MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP) {
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+ if (i <= max_uA)
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+ break;
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+ current_bits--;
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+ }
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+ BUG_ON(current_bits < 0); /* Cannot happen */
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+ /* Turn Low Bit on (use range 200mA-950 mA) */
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+ reg_data = 0x1 << CHGCTRL4_MBCICHWRCL_SHIFT;
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+ /* and set proper High Bits */
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+ reg_data |= current_bits << CHGCTRL4_MBCICHWRCH_SHIFT;
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+
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+ return max14577_update_reg(rdev->regmap, MAX14577_CHG_REG_CHG_CTRL4,
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+ CHGCTRL4_MBCICHWRCL_MASK | CHGCTRL4_MBCICHWRCH_MASK,
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+ reg_data);
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+}
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+
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+static struct regulator_ops max14577_safeout_ops = {
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+ .is_enabled = regulator_is_enabled_regmap,
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+ .enable = regulator_enable_regmap,
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+ .disable = regulator_disable_regmap,
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+ .list_voltage = regulator_list_voltage_linear,
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+};
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+
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+static struct regulator_ops max14577_charger_ops = {
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+ .is_enabled = max14577_reg_is_enabled,
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+ .enable = regulator_enable_regmap,
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+ .disable = regulator_disable_regmap,
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+ .get_current_limit = max14577_reg_get_current_limit,
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+ .set_current_limit = max14577_reg_set_current_limit,
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+};
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+
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+static const struct regulator_desc supported_regulators[] = {
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+ [MAX14577_SAFEOUT] = {
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+ .name = "SAFEOUT",
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+ .id = MAX14577_SAFEOUT,
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+ .ops = &max14577_safeout_ops,
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+ .type = REGULATOR_VOLTAGE,
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+ .owner = THIS_MODULE,
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+ .n_voltages = 1,
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+ .min_uV = MAX14577_REGULATOR_SAFEOUT_VOLTAGE,
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+ .enable_reg = MAX14577_REG_CONTROL2,
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+ .enable_mask = CTRL2_SFOUTORD_MASK,
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+ },
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+ [MAX14577_CHARGER] = {
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+ .name = "CHARGER",
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+ .id = MAX14577_CHARGER,
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+ .ops = &max14577_charger_ops,
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+ .type = REGULATOR_CURRENT,
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+ .owner = THIS_MODULE,
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+ .enable_reg = MAX14577_CHG_REG_CHG_CTRL2,
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+ .enable_mask = CHGCTRL2_MBCHOSTEN_MASK,
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+ },
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+};
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+
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+#ifdef CONFIG_OF
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+static struct of_regulator_match max14577_regulator_matches[] = {
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+ { .name = "SAFEOUT", },
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+ { .name = "CHARGER", },
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+};
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+
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+static int max14577_regulator_dt_parse_pdata(struct platform_device *pdev)
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+{
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+ int ret;
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+ struct device_node *np;
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+
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+ np = of_get_child_by_name(pdev->dev.parent->of_node, "regulators");
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+ if (!np) {
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+ dev_err(&pdev->dev, "Failed to get child OF node for regulators\n");
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+ return -EINVAL;
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+ }
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+
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+ ret = of_regulator_match(&pdev->dev, np, max14577_regulator_matches,
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+ MAX14577_REG_MAX);
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+ if (ret < 0) {
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+ dev_err(&pdev->dev, "Error parsing regulator init data: %d\n", ret);
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+ return ret;
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+ }
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+
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+ return 0;
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+}
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+
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+static inline struct regulator_init_data *match_init_data(int index)
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+{
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+ return max14577_regulator_matches[index].init_data;
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+}
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+
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+static inline struct device_node *match_of_node(int index)
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+{
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+ return max14577_regulator_matches[index].of_node;
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+}
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+#else /* CONFIG_OF */
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+static int max14577_regulator_dt_parse_pdata(struct platform_device *pdev)
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+{
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+ return 0;
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+}
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+static inline struct regulator_init_data *match_init_data(int index)
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+{
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+ return NULL;
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+}
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+
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+static inline struct device_node *match_of_node(int index)
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+{
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+ return NULL;
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+}
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+#endif /* CONFIG_OF */
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+
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+
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+static int max14577_regulator_probe(struct platform_device *pdev)
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+{
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+ struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
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+ struct max14577_platform_data *pdata = dev_get_platdata(max14577->dev);
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+ int i, ret;
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+ struct regulator_config config = {};
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+
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+ ret = max14577_regulator_dt_parse_pdata(pdev);
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+ if (ret)
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+ return ret;
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+
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+ config.dev = &pdev->dev;
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+ config.regmap = max14577->regmap;
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+
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+ for (i = 0; i < ARRAY_SIZE(supported_regulators); i++) {
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+ struct regulator_dev *regulator;
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+ /*
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+ * Index of supported_regulators[] is also the id and must
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+ * match index of pdata->regulators[].
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+ */
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+ if (pdata && pdata->regulators) {
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+ config.init_data = pdata->regulators[i].initdata;
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+ config.of_node = pdata->regulators[i].of_node;
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+ } else {
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+ config.init_data = match_init_data(i);
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+ config.of_node = match_of_node(i);
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+ }
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+
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+ regulator = devm_regulator_register(&pdev->dev,
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+ &supported_regulators[i], &config);
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+ if (IS_ERR(regulator)) {
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+ ret = PTR_ERR(regulator);
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+ dev_err(&pdev->dev,
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+ "Regulator init failed for ID %d with error: %d\n",
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+ i, ret);
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+ return ret;
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+ }
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+ }
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+
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+ return ret;
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+}
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+
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+static struct platform_driver max14577_regulator_driver = {
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+ .driver = {
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+ .owner = THIS_MODULE,
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+ .name = "max14577-regulator",
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+ },
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+ .probe = max14577_regulator_probe,
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+};
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+
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+static int __init max14577_regulator_init(void)
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+{
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+ BUILD_BUG_ON(MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START +
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+ MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP * 0xf !=
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+ MAX14577_REGULATOR_CURRENT_LIMIT_MAX);
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+ BUILD_BUG_ON(ARRAY_SIZE(supported_regulators) != MAX14577_REG_MAX);
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+
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+ return platform_driver_register(&max14577_regulator_driver);
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+}
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+subsys_initcall(max14577_regulator_init);
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+
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+static void __exit max14577_regulator_exit(void)
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+{
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+ platform_driver_unregister(&max14577_regulator_driver);
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+}
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+module_exit(max14577_regulator_exit);
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+
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+MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski@samsung.com>");
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+MODULE_DESCRIPTION("MAXIM 14577 regulator driver");
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+MODULE_LICENSE("GPL");
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+MODULE_ALIAS("platform:max14577-regulator");
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Mark Brown
11 years ago