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271 lines
8.1 KiB
271 lines
8.1 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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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 <[email protected]> |
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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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/* |
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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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} |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("Maxim 14577/77836 regulator driver"); |
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MODULE_LICENSE("GPL");
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