/* * Copyright (c) 2015 MediaTek Inc. * Author: Henry Chen <henryc.chen@mediatek.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #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_linear_range buck_volt_range[] = { REGULATOR_LINEAR_RANGE(MT6311_MIN_UV, 0, 0x7f, MT6311_STEP_UV), }; static const struct regulator_ops mt6311_buck_ops = { .list_voltage = regulator_list_voltage_linear_range, .map_voltage = regulator_map_voltage_linear_range, .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,\ .linear_ranges = buck_volt_range, \ .n_linear_ranges = ARRAY_SIZE(buck_volt_range), \ .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, const struct i2c_device_id *id) { 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", .of_match_table = of_match_ptr(mt6311_dt_ids), }, .probe = 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");