338 lines
9.9 KiB
C
338 lines
9.9 KiB
C
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/*
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* max14577.c - Regulator driver for the Maxim 14577/77836
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*
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* Copyright (C) 2013,2014 Samsung Electronics
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* Krzysztof Kozlowski <krzk@kernel.org>
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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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#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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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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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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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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struct max14577 *max14577 = rdev_get_drvdata(rdev);
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const struct maxim_charger_current *limits =
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&maxim_charger_currents[max14577->dev_type];
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if (rdev_get_id(rdev) != MAX14577_CHARGER)
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return -EINVAL;
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max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL4, ®_data);
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if ((reg_data & CHGCTRL4_MBCICHWRCL_MASK) == 0)
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return limits->min;
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reg_data = ((reg_data & CHGCTRL4_MBCICHWRCH_MASK) >>
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CHGCTRL4_MBCICHWRCH_SHIFT);
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return limits->high_start + reg_data * limits->high_step;
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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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u8 reg_data;
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int ret;
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struct max14577 *max14577 = rdev_get_drvdata(rdev);
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const struct maxim_charger_current *limits =
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&maxim_charger_currents[max14577->dev_type];
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if (rdev_get_id(rdev) != MAX14577_CHARGER)
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return -EINVAL;
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ret = maxim_charger_calc_reg_current(limits, min_uA, max_uA, ®_data);
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if (ret)
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return ret;
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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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static const 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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static const 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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#define MAX14577_SAFEOUT_REG { \
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.name = "SAFEOUT", \
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.of_match = of_match_ptr("SAFEOUT"), \
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.regulators_node = of_match_ptr("regulators"), \
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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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#define MAX14577_CHARGER_REG { \
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.name = "CHARGER", \
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.of_match = of_match_ptr("CHARGER"), \
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.regulators_node = of_match_ptr("regulators"), \
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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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static const struct regulator_desc max14577_supported_regulators[] = {
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[MAX14577_SAFEOUT] = MAX14577_SAFEOUT_REG,
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[MAX14577_CHARGER] = MAX14577_CHARGER_REG,
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};
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static const struct regulator_ops max77836_ldo_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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.map_voltage = regulator_map_voltage_linear,
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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.set_voltage_sel = regulator_set_voltage_sel_regmap,
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/* TODO: add .set_suspend_mode */
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};
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#define MAX77836_LDO_REG(num) { \
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.name = "LDO" # num, \
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.of_match = of_match_ptr("LDO" # num), \
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.regulators_node = of_match_ptr("regulators"), \
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.id = MAX77836_LDO ## num, \
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.ops = &max77836_ldo_ops, \
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.type = REGULATOR_VOLTAGE, \
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.owner = THIS_MODULE, \
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.n_voltages = MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM, \
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.min_uV = MAX77836_REGULATOR_LDO_VOLTAGE_MIN, \
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.uV_step = MAX77836_REGULATOR_LDO_VOLTAGE_STEP, \
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.enable_reg = MAX77836_LDO_REG_CNFG1_LDO ## num, \
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.enable_mask = MAX77836_CNFG1_LDO_PWRMD_MASK, \
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.vsel_reg = MAX77836_LDO_REG_CNFG1_LDO ## num, \
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.vsel_mask = MAX77836_CNFG1_LDO_TV_MASK, \
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}
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static const struct regulator_desc max77836_supported_regulators[] = {
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[MAX14577_SAFEOUT] = MAX14577_SAFEOUT_REG,
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[MAX14577_CHARGER] = MAX14577_CHARGER_REG,
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[MAX77836_LDO1] = MAX77836_LDO_REG(1),
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[MAX77836_LDO2] = MAX77836_LDO_REG(2),
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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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static struct of_regulator_match max77836_regulator_matches[] = {
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{ .name = "SAFEOUT", },
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{ .name = "CHARGER", },
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{ .name = "LDO1", },
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{ .name = "LDO2", },
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};
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static inline struct regulator_init_data *match_init_data(int index,
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enum maxim_device_type dev_type)
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{
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switch (dev_type) {
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case MAXIM_DEVICE_TYPE_MAX77836:
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return max77836_regulator_matches[index].init_data;
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case MAXIM_DEVICE_TYPE_MAX14577:
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default:
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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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enum maxim_device_type dev_type)
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{
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switch (dev_type) {
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case MAXIM_DEVICE_TYPE_MAX77836:
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return max77836_regulator_matches[index].of_node;
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case MAXIM_DEVICE_TYPE_MAX14577:
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default:
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return max14577_regulator_matches[index].of_node;
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}
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}
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#else /* CONFIG_OF */
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static inline struct regulator_init_data *match_init_data(int index,
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enum maxim_device_type dev_type)
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{
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return NULL;
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}
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static inline struct device_node *match_of_node(int index,
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enum maxim_device_type dev_type)
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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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* Registers for regulators of max77836 use different I2C slave addresses so
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* different regmaps must be used for them.
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*
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* Returns proper regmap for accessing regulator passed by id.
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*/
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static struct regmap *max14577_get_regmap(struct max14577 *max14577,
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int reg_id)
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{
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switch (max14577->dev_type) {
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case MAXIM_DEVICE_TYPE_MAX77836:
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switch (reg_id) {
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case MAX77836_SAFEOUT ... MAX77836_CHARGER:
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return max14577->regmap;
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default:
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/* MAX77836_LDO1 ... MAX77836_LDO2 */
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return max14577->regmap_pmic;
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}
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case MAXIM_DEVICE_TYPE_MAX14577:
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default:
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return max14577->regmap;
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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 = 0;
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struct regulator_config config = {};
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const struct regulator_desc *supported_regulators;
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unsigned int supported_regulators_size;
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enum maxim_device_type dev_type = max14577->dev_type;
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switch (dev_type) {
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case MAXIM_DEVICE_TYPE_MAX77836:
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supported_regulators = max77836_supported_regulators;
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supported_regulators_size = ARRAY_SIZE(max77836_supported_regulators);
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break;
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case MAXIM_DEVICE_TYPE_MAX14577:
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default:
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supported_regulators = max14577_supported_regulators;
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supported_regulators_size = ARRAY_SIZE(max14577_supported_regulators);
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}
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config.dev = max14577->dev;
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config.driver_data = max14577;
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for (i = 0; i < supported_regulators_size; 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, dev_type);
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config.of_node = match_of_node(i, dev_type);
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}
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config.regmap = max14577_get_regmap(max14577,
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supported_regulators[i].id);
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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 %d/%s with error: %d\n",
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i, supported_regulators[i].name, ret);
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return ret;
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}
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}
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return ret;
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}
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static const struct platform_device_id max14577_regulator_id[] = {
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{ "max14577-regulator", MAXIM_DEVICE_TYPE_MAX14577, },
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{ "max77836-regulator", MAXIM_DEVICE_TYPE_MAX77836, },
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{ }
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};
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MODULE_DEVICE_TABLE(platform, max14577_regulator_id);
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static struct platform_driver max14577_regulator_driver = {
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.driver = {
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.name = "max14577-regulator",
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},
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.probe = max14577_regulator_probe,
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.id_table = max14577_regulator_id,
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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(ARRAY_SIZE(max14577_supported_regulators) != MAX14577_REGULATOR_NUM);
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BUILD_BUG_ON(ARRAY_SIZE(max77836_supported_regulators) != MAX77836_REGULATOR_NUM);
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BUILD_BUG_ON(MAX77836_REGULATOR_LDO_VOLTAGE_MIN +
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(MAX77836_REGULATOR_LDO_VOLTAGE_STEP *
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(MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM - 1)) !=
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MAX77836_REGULATOR_LDO_VOLTAGE_MAX);
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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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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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MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>");
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MODULE_DESCRIPTION("Maxim 14577/77836 regulator driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:max14577-regulator");
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