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