| // SPDX-License-Identifier: GPL-2.0 |
| // |
| // Copyright (c) 2015 MediaTek Inc. |
| // Author: Henry Chen <henryc.chen@mediatek.com> |
| |
| #include <linux/err.h> |
| #include <linux/gpio.h> |
| #include <linux/i2c.h> |
| #include <linux/init.h> |
| #include <linux/interrupt.h> |
| #include <linux/module.h> |
| #include <linux/regmap.h> |
| #include <linux/regulator/driver.h> |
| #include <linux/regulator/machine.h> |
| #include <linux/regulator/of_regulator.h> |
| #include <linux/regulator/mt6311.h> |
| #include <linux/slab.h> |
| #include "mt6311-regulator.h" |
| |
| static const struct regmap_config mt6311_regmap_config = { |
| .reg_bits = 8, |
| .val_bits = 8, |
| .max_register = MT6311_FQMTR_CON4, |
| .cache_type = REGCACHE_RBTREE, |
| }; |
| |
| /* Default limits measured in millivolts and milliamps */ |
| #define MT6311_MIN_UV 600000 |
| #define MT6311_MAX_UV 1393750 |
| #define MT6311_STEP_UV 6250 |
| |
| static const struct regulator_ops mt6311_buck_ops = { |
| .list_voltage = regulator_list_voltage_linear, |
| .map_voltage = regulator_map_voltage_linear, |
| .set_voltage_sel = regulator_set_voltage_sel_regmap, |
| .get_voltage_sel = regulator_get_voltage_sel_regmap, |
| .set_voltage_time_sel = regulator_set_voltage_time_sel, |
| .enable = regulator_enable_regmap, |
| .disable = regulator_disable_regmap, |
| .is_enabled = regulator_is_enabled_regmap, |
| }; |
| |
| static const struct regulator_ops mt6311_ldo_ops = { |
| .enable = regulator_enable_regmap, |
| .disable = regulator_disable_regmap, |
| .is_enabled = regulator_is_enabled_regmap, |
| }; |
| |
| #define MT6311_BUCK(_id) \ |
| {\ |
| .name = #_id,\ |
| .ops = &mt6311_buck_ops,\ |
| .of_match = of_match_ptr(#_id),\ |
| .regulators_node = of_match_ptr("regulators"),\ |
| .type = REGULATOR_VOLTAGE,\ |
| .id = MT6311_ID_##_id,\ |
| .n_voltages = (MT6311_MAX_UV - MT6311_MIN_UV) / MT6311_STEP_UV + 1,\ |
| .min_uV = MT6311_MIN_UV,\ |
| .uV_step = MT6311_STEP_UV,\ |
| .owner = THIS_MODULE,\ |
| .enable_reg = MT6311_VDVFS11_CON9,\ |
| .enable_mask = MT6311_PMIC_VDVFS11_EN_MASK,\ |
| .vsel_reg = MT6311_VDVFS11_CON12,\ |
| .vsel_mask = MT6311_PMIC_VDVFS11_VOSEL_MASK,\ |
| } |
| |
| #define MT6311_LDO(_id) \ |
| {\ |
| .name = #_id,\ |
| .ops = &mt6311_ldo_ops,\ |
| .of_match = of_match_ptr(#_id),\ |
| .regulators_node = of_match_ptr("regulators"),\ |
| .type = REGULATOR_VOLTAGE,\ |
| .id = MT6311_ID_##_id,\ |
| .owner = THIS_MODULE,\ |
| .enable_reg = MT6311_LDO_CON3,\ |
| .enable_mask = MT6311_PMIC_RG_VBIASN_EN_MASK,\ |
| } |
| |
| static const struct regulator_desc mt6311_regulators[] = { |
| MT6311_BUCK(VDVFS), |
| MT6311_LDO(VBIASN), |
| }; |
| |
| /* |
| * I2C driver interface functions |
| */ |
| static int mt6311_i2c_probe(struct i2c_client *i2c) |
| { |
| struct regulator_config config = { }; |
| struct regulator_dev *rdev; |
| struct regmap *regmap; |
| int i, ret; |
| unsigned int data; |
| |
| regmap = devm_regmap_init_i2c(i2c, &mt6311_regmap_config); |
| if (IS_ERR(regmap)) { |
| ret = PTR_ERR(regmap); |
| dev_err(&i2c->dev, "Failed to allocate register map: %d\n", |
| ret); |
| return ret; |
| } |
| |
| ret = regmap_read(regmap, MT6311_SWCID, &data); |
| if (ret < 0) { |
| dev_err(&i2c->dev, "Failed to read DEVICE_ID reg: %d\n", ret); |
| return ret; |
| } |
| |
| switch (data) { |
| case MT6311_E1_CID_CODE: |
| case MT6311_E2_CID_CODE: |
| case MT6311_E3_CID_CODE: |
| break; |
| default: |
| dev_err(&i2c->dev, "Unsupported device id = 0x%x.\n", data); |
| return -ENODEV; |
| } |
| |
| for (i = 0; i < MT6311_MAX_REGULATORS; i++) { |
| config.dev = &i2c->dev; |
| config.regmap = regmap; |
| |
| rdev = devm_regulator_register(&i2c->dev, |
| &mt6311_regulators[i], &config); |
| if (IS_ERR(rdev)) { |
| dev_err(&i2c->dev, |
| "Failed to register MT6311 regulator\n"); |
| return PTR_ERR(rdev); |
| } |
| } |
| |
| return 0; |
| } |
| |
| static const struct i2c_device_id mt6311_i2c_id[] = { |
| {"mt6311", 0}, |
| {}, |
| }; |
| MODULE_DEVICE_TABLE(i2c, mt6311_i2c_id); |
| |
| #ifdef CONFIG_OF |
| static const struct of_device_id mt6311_dt_ids[] = { |
| { .compatible = "mediatek,mt6311-regulator", |
| .data = &mt6311_i2c_id[0] }, |
| {}, |
| }; |
| MODULE_DEVICE_TABLE(of, mt6311_dt_ids); |
| #endif |
| |
| static struct i2c_driver mt6311_regulator_driver = { |
| .driver = { |
| .name = "mt6311", |
| .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
| .of_match_table = of_match_ptr(mt6311_dt_ids), |
| }, |
| .probe_new = mt6311_i2c_probe, |
| .id_table = mt6311_i2c_id, |
| }; |
| |
| module_i2c_driver(mt6311_regulator_driver); |
| |
| MODULE_AUTHOR("Henry Chen <henryc.chen@mediatek.com>"); |
| MODULE_DESCRIPTION("Regulator device driver for Mediatek MT6311"); |
| MODULE_LICENSE("GPL v2"); |