cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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mt6311-regulator.c (4181B)

      1// SPDX-License-Identifier: GPL-2.0
      2//
      3// Copyright (c) 2015 MediaTek Inc.
      4// Author: Henry Chen <henryc.chen@mediatek.com>
      5
      6#include <linux/err.h>
      7#include <linux/gpio.h>
      8#include <linux/i2c.h>
      9#include <linux/init.h>
     10#include <linux/interrupt.h>
     11#include <linux/module.h>
     12#include <linux/regmap.h>
     13#include <linux/regulator/driver.h>
     14#include <linux/regulator/machine.h>
     15#include <linux/regulator/of_regulator.h>
     16#include <linux/regulator/mt6311.h>
     17#include <linux/slab.h>
     18#include "mt6311-regulator.h"
     19
     20static const struct regmap_config mt6311_regmap_config = {
     21	.reg_bits = 8,
     22	.val_bits = 8,
     23	.max_register = MT6311_FQMTR_CON4,
     24	.cache_type = REGCACHE_RBTREE,
     25};
     26
     27/* Default limits measured in millivolts and milliamps */
     28#define MT6311_MIN_UV		600000
     29#define MT6311_MAX_UV		1393750
     30#define MT6311_STEP_UV		6250
     31
     32static const struct regulator_ops mt6311_buck_ops = {
     33	.list_voltage = regulator_list_voltage_linear,
     34	.map_voltage = regulator_map_voltage_linear,
     35	.set_voltage_sel = regulator_set_voltage_sel_regmap,
     36	.get_voltage_sel = regulator_get_voltage_sel_regmap,
     37	.set_voltage_time_sel = regulator_set_voltage_time_sel,
     38	.enable = regulator_enable_regmap,
     39	.disable = regulator_disable_regmap,
     40	.is_enabled = regulator_is_enabled_regmap,
     41};
     42
     43static const struct regulator_ops mt6311_ldo_ops = {
     44	.enable = regulator_enable_regmap,
     45	.disable = regulator_disable_regmap,
     46	.is_enabled = regulator_is_enabled_regmap,
     47};
     48
     49#define MT6311_BUCK(_id) \
     50{\
     51	.name = #_id,\
     52	.ops = &mt6311_buck_ops,\
     53	.of_match = of_match_ptr(#_id),\
     54	.regulators_node = of_match_ptr("regulators"),\
     55	.type = REGULATOR_VOLTAGE,\
     56	.id = MT6311_ID_##_id,\
     57	.n_voltages = (MT6311_MAX_UV - MT6311_MIN_UV) / MT6311_STEP_UV + 1,\
     58	.min_uV = MT6311_MIN_UV,\
     59	.uV_step = MT6311_STEP_UV,\
     60	.owner = THIS_MODULE,\
     61	.enable_reg = MT6311_VDVFS11_CON9,\
     62	.enable_mask = MT6311_PMIC_VDVFS11_EN_MASK,\
     63	.vsel_reg = MT6311_VDVFS11_CON12,\
     64	.vsel_mask = MT6311_PMIC_VDVFS11_VOSEL_MASK,\
     65}
     66
     67#define MT6311_LDO(_id) \
     68{\
     69	.name = #_id,\
     70	.ops = &mt6311_ldo_ops,\
     71	.of_match = of_match_ptr(#_id),\
     72	.regulators_node = of_match_ptr("regulators"),\
     73	.type = REGULATOR_VOLTAGE,\
     74	.id = MT6311_ID_##_id,\
     75	.owner = THIS_MODULE,\
     76	.enable_reg = MT6311_LDO_CON3,\
     77	.enable_mask = MT6311_PMIC_RG_VBIASN_EN_MASK,\
     78}
     79
     80static const struct regulator_desc mt6311_regulators[] = {
     81	MT6311_BUCK(VDVFS),
     82	MT6311_LDO(VBIASN),
     83};
     84
     85/*
     86 * I2C driver interface functions
     87 */
     88static int mt6311_i2c_probe(struct i2c_client *i2c)
     89{
     90	struct regulator_config config = { };
     91	struct regulator_dev *rdev;
     92	struct regmap *regmap;
     93	int i, ret;
     94	unsigned int data;
     95
     96	regmap = devm_regmap_init_i2c(i2c, &mt6311_regmap_config);
     97	if (IS_ERR(regmap)) {
     98		ret = PTR_ERR(regmap);
     99		dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
    100			ret);
    101		return ret;
    102	}
    103
    104	ret = regmap_read(regmap, MT6311_SWCID, &data);
    105	if (ret < 0) {
    106		dev_err(&i2c->dev, "Failed to read DEVICE_ID reg: %d\n", ret);
    107		return ret;
    108	}
    109
    110	switch (data) {
    111	case MT6311_E1_CID_CODE:
    112	case MT6311_E2_CID_CODE:
    113	case MT6311_E3_CID_CODE:
    114		break;
    115	default:
    116		dev_err(&i2c->dev, "Unsupported device id = 0x%x.\n", data);
    117		return -ENODEV;
    118	}
    119
    120	for (i = 0; i < MT6311_MAX_REGULATORS; i++) {
    121		config.dev = &i2c->dev;
    122		config.regmap = regmap;
    123
    124		rdev = devm_regulator_register(&i2c->dev,
    125			&mt6311_regulators[i], &config);
    126		if (IS_ERR(rdev)) {
    127			dev_err(&i2c->dev,
    128				"Failed to register MT6311 regulator\n");
    129			return PTR_ERR(rdev);
    130		}
    131	}
    132
    133	return 0;
    134}
    135
    136static const struct i2c_device_id mt6311_i2c_id[] = {
    137	{"mt6311", 0},
    138	{},
    139};
    140MODULE_DEVICE_TABLE(i2c, mt6311_i2c_id);
    141
    142#ifdef CONFIG_OF
    143static const struct of_device_id mt6311_dt_ids[] = {
    144	{ .compatible = "mediatek,mt6311-regulator",
    145	  .data = &mt6311_i2c_id[0] },
    146	{},
    147};
    148MODULE_DEVICE_TABLE(of, mt6311_dt_ids);
    149#endif
    150
    151static struct i2c_driver mt6311_regulator_driver = {
    152	.driver = {
    153		.name = "mt6311",
    154		.of_match_table = of_match_ptr(mt6311_dt_ids),
    155	},
    156	.probe_new = mt6311_i2c_probe,
    157	.id_table = mt6311_i2c_id,
    158};
    159
    160module_i2c_driver(mt6311_regulator_driver);
    161
    162MODULE_AUTHOR("Henry Chen <henryc.chen@mediatek.com>");
    163MODULE_DESCRIPTION("Regulator device driver for Mediatek MT6311");
    164MODULE_LICENSE("GPL v2");