// SPDX-License-Identifier: GPL-2.0+ // // max14577.c - Regulator driver for the Maxim 14577/77836 // // Copyright (C) 2013,2014 Samsung Electronics // Krzysztof Kozlowski <krzk@kernel.org> #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> 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, ®_data); if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0) return 0; max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, ®_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; struct max14577 *max14577 = rdev_get_drvdata(rdev); const struct maxim_charger_current *limits = &maxim_charger_currents[max14577->dev_type]; if (rdev_get_id(rdev) != MAX14577_CHARGER) return -EINVAL; max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL4, ®_data); if ((reg_data & CHGCTRL4_MBCICHWRCL_MASK) == 0) return limits->min; reg_data = ((reg_data & CHGCTRL4_MBCICHWRCH_MASK) >> CHGCTRL4_MBCICHWRCH_SHIFT); return limits->high_start + reg_data * limits->high_step; } static int max14577_reg_set_current_limit(struct regulator_dev *rdev, int min_uA, int max_uA) { u8 reg_data; int ret; struct max14577 *max14577 = rdev_get_drvdata(rdev); const struct maxim_charger_current *limits = &maxim_charger_currents[max14577->dev_type]; if (rdev_get_id(rdev) != MAX14577_CHARGER) return -EINVAL; ret = maxim_charger_calc_reg_current(limits, min_uA, max_uA, ®_data); if (ret) return ret; return max14577_update_reg(rdev->regmap, MAX14577_CHG_REG_CHG_CTRL4, CHGCTRL4_MBCICHWRCL_MASK | CHGCTRL4_MBCICHWRCH_MASK, reg_data); } static const 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 const 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, }; #define MAX14577_SAFEOUT_REG { \ .name = "SAFEOUT", \ .of_match = of_match_ptr("SAFEOUT"), \ .regulators_node = of_match_ptr("regulators"), \ .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, \ } #define MAX14577_CHARGER_REG { \ .name = "CHARGER", \ .of_match = of_match_ptr("CHARGER"), \ .regulators_node = of_match_ptr("regulators"), \ .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, \ } static const struct regulator_desc max14577_supported_regulators[] = { [MAX14577_SAFEOUT] = MAX14577_SAFEOUT_REG, [MAX14577_CHARGER] = MAX14577_CHARGER_REG, }; static const struct regulator_ops max77836_ldo_ops = { .is_enabled = regulator_is_enabled_regmap, .enable = regulator_enable_regmap, .disable = regulator_disable_regmap, .list_voltage = regulator_list_voltage_linear, .map_voltage = regulator_map_voltage_linear, .get_voltage_sel = regulator_get_voltage_sel_regmap, .set_voltage_sel = regulator_set_voltage_sel_regmap, /* TODO: add .set_suspend_mode */ }; #define MAX77836_LDO_REG(num) { \ .name = "LDO" # num, \ .of_match = of_match_ptr("LDO" # num), \ .regulators_node = of_match_ptr("regulators"), \ .id = MAX77836_LDO ## num, \ .ops = &max77836_ldo_ops, \ .type = REGULATOR_VOLTAGE, \ .owner = THIS_MODULE, \ .n_voltages = MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM, \ .min_uV = MAX77836_REGULATOR_LDO_VOLTAGE_MIN, \ .uV_step = MAX77836_REGULATOR_LDO_VOLTAGE_STEP, \ .enable_reg = MAX77836_LDO_REG_CNFG1_LDO ## num, \ .enable_mask = MAX77836_CNFG1_LDO_PWRMD_MASK, \ .vsel_reg = MAX77836_LDO_REG_CNFG1_LDO ## num, \ .vsel_mask = MAX77836_CNFG1_LDO_TV_MASK, \ } static const struct regulator_desc max77836_supported_regulators[] = { [MAX14577_SAFEOUT] = MAX14577_SAFEOUT_REG, [MAX14577_CHARGER] = MAX14577_CHARGER_REG, [MAX77836_LDO1] = MAX77836_LDO_REG(1), [MAX77836_LDO2] = MAX77836_LDO_REG(2), }; /* * Registers for regulators of max77836 use different I2C slave addresses so * different regmaps must be used for them. * * Returns proper regmap for accessing regulator passed by id. */ static struct regmap *max14577_get_regmap(struct max14577 *max14577, int reg_id) { switch (max14577->dev_type) { case MAXIM_DEVICE_TYPE_MAX77836: switch (reg_id) { case MAX77836_SAFEOUT ... MAX77836_CHARGER: return max14577->regmap; default: /* MAX77836_LDO1 ... MAX77836_LDO2 */ return max14577->regmap_pmic; } case MAXIM_DEVICE_TYPE_MAX14577: default: return max14577->regmap; } } 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 = 0; struct regulator_config config = {}; const struct regulator_desc *supported_regulators; unsigned int supported_regulators_size; enum maxim_device_type dev_type = max14577->dev_type; switch (dev_type) { case MAXIM_DEVICE_TYPE_MAX77836: supported_regulators = max77836_supported_regulators; supported_regulators_size = ARRAY_SIZE(max77836_supported_regulators); break; case MAXIM_DEVICE_TYPE_MAX14577: default: supported_regulators = max14577_supported_regulators; supported_regulators_size = ARRAY_SIZE(max14577_supported_regulators); } config.dev = max14577->dev; config.driver_data = max14577; for (i = 0; i < supported_regulators_size; 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; } config.regmap = max14577_get_regmap(max14577, supported_regulators[i].id); 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 %d/%s with error: %d\n", i, supported_regulators[i].name, ret); return ret; } } return ret; } static const struct platform_device_id max14577_regulator_id[] = { { "max14577-regulator", MAXIM_DEVICE_TYPE_MAX14577, }, { "max77836-regulator", MAXIM_DEVICE_TYPE_MAX77836, }, { } }; MODULE_DEVICE_TABLE(platform, max14577_regulator_id); static struct platform_driver max14577_regulator_driver = { .driver = { .name = "max14577-regulator", .probe_type = PROBE_PREFER_ASYNCHRONOUS, }, .probe = max14577_regulator_probe, .id_table = max14577_regulator_id, }; static int __init max14577_regulator_init(void) { BUILD_BUG_ON(ARRAY_SIZE(max14577_supported_regulators) != MAX14577_REGULATOR_NUM); BUILD_BUG_ON(ARRAY_SIZE(max77836_supported_regulators) != MAX77836_REGULATOR_NUM); BUILD_BUG_ON(MAX77836_REGULATOR_LDO_VOLTAGE_MIN + (MAX77836_REGULATOR_LDO_VOLTAGE_STEP * (MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM - 1)) != MAX77836_REGULATOR_LDO_VOLTAGE_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 <krzk@kernel.org>"); MODULE_DESCRIPTION("Maxim 14577/77836 regulator driver"); MODULE_LICENSE("GPL");