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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max14577-regulator.c (8276B)

      1// SPDX-License-Identifier: GPL-2.0+
      2//
      3// max14577.c - Regulator driver for the Maxim 14577/77836
      4//
      5// Copyright (C) 2013,2014 Samsung Electronics
      6// Krzysztof Kozlowski <krzk@kernel.org>
      7
      8#include <linux/module.h>
      9#include <linux/platform_device.h>
     10#include <linux/regulator/driver.h>
     11#include <linux/mfd/max14577.h>
     12#include <linux/mfd/max14577-private.h>
     13#include <linux/regulator/of_regulator.h>
     14
     15static int max14577_reg_is_enabled(struct regulator_dev *rdev)
     16{
     17	int rid = rdev_get_id(rdev);
     18	struct regmap *rmap = rdev->regmap;
     19	u8 reg_data;
     20
     21	switch (rid) {
     22	case MAX14577_CHARGER:
     23		max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL2, &reg_data);
     24		if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0)
     25			return 0;
     26		max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, &reg_data);
     27		if ((reg_data & STATUS3_CGMBC_MASK) == 0)
     28			return 0;
     29		/* MBCHOSTEN and CGMBC are on */
     30		return 1;
     31	default:
     32		return -EINVAL;
     33	}
     34}
     35
     36static int max14577_reg_get_current_limit(struct regulator_dev *rdev)
     37{
     38	u8 reg_data;
     39	struct regmap *rmap = rdev->regmap;
     40	struct max14577 *max14577 = rdev_get_drvdata(rdev);
     41	const struct maxim_charger_current *limits =
     42		&maxim_charger_currents[max14577->dev_type];
     43
     44	if (rdev_get_id(rdev) != MAX14577_CHARGER)
     45		return -EINVAL;
     46
     47	max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL4, &reg_data);
     48
     49	if ((reg_data & CHGCTRL4_MBCICHWRCL_MASK) == 0)
     50		return limits->min;
     51
     52	reg_data = ((reg_data & CHGCTRL4_MBCICHWRCH_MASK) >>
     53			CHGCTRL4_MBCICHWRCH_SHIFT);
     54	return limits->high_start + reg_data * limits->high_step;
     55}
     56
     57static int max14577_reg_set_current_limit(struct regulator_dev *rdev,
     58		int min_uA, int max_uA)
     59{
     60	u8 reg_data;
     61	int ret;
     62	struct max14577 *max14577 = rdev_get_drvdata(rdev);
     63	const struct maxim_charger_current *limits =
     64		&maxim_charger_currents[max14577->dev_type];
     65
     66	if (rdev_get_id(rdev) != MAX14577_CHARGER)
     67		return -EINVAL;
     68
     69	ret = maxim_charger_calc_reg_current(limits, min_uA, max_uA, &reg_data);
     70	if (ret)
     71		return ret;
     72
     73	return max14577_update_reg(rdev->regmap, MAX14577_CHG_REG_CHG_CTRL4,
     74			CHGCTRL4_MBCICHWRCL_MASK | CHGCTRL4_MBCICHWRCH_MASK,
     75			reg_data);
     76}
     77
     78static const struct regulator_ops max14577_safeout_ops = {
     79	.is_enabled		= regulator_is_enabled_regmap,
     80	.enable			= regulator_enable_regmap,
     81	.disable		= regulator_disable_regmap,
     82	.list_voltage		= regulator_list_voltage_linear,
     83};
     84
     85static const struct regulator_ops max14577_charger_ops = {
     86	.is_enabled		= max14577_reg_is_enabled,
     87	.enable			= regulator_enable_regmap,
     88	.disable		= regulator_disable_regmap,
     89	.get_current_limit	= max14577_reg_get_current_limit,
     90	.set_current_limit	= max14577_reg_set_current_limit,
     91};
     92
     93#define MAX14577_SAFEOUT_REG	{ \
     94	.name		= "SAFEOUT", \
     95	.of_match	= of_match_ptr("SAFEOUT"), \
     96	.regulators_node = of_match_ptr("regulators"), \
     97	.id		= MAX14577_SAFEOUT, \
     98	.ops		= &max14577_safeout_ops, \
     99	.type		= REGULATOR_VOLTAGE, \
    100	.owner		= THIS_MODULE, \
    101	.n_voltages	= 1, \
    102	.min_uV		= MAX14577_REGULATOR_SAFEOUT_VOLTAGE, \
    103	.enable_reg	= MAX14577_REG_CONTROL2, \
    104	.enable_mask	= CTRL2_SFOUTORD_MASK, \
    105}
    106#define MAX14577_CHARGER_REG	{ \
    107	.name		= "CHARGER", \
    108	.of_match	= of_match_ptr("CHARGER"), \
    109	.regulators_node = of_match_ptr("regulators"), \
    110	.id		= MAX14577_CHARGER, \
    111	.ops		= &max14577_charger_ops, \
    112	.type		= REGULATOR_CURRENT, \
    113	.owner		= THIS_MODULE, \
    114	.enable_reg	= MAX14577_CHG_REG_CHG_CTRL2, \
    115	.enable_mask	= CHGCTRL2_MBCHOSTEN_MASK, \
    116}
    117
    118static const struct regulator_desc max14577_supported_regulators[] = {
    119	[MAX14577_SAFEOUT] = MAX14577_SAFEOUT_REG,
    120	[MAX14577_CHARGER] = MAX14577_CHARGER_REG,
    121};
    122
    123static const struct regulator_ops max77836_ldo_ops = {
    124	.is_enabled		= regulator_is_enabled_regmap,
    125	.enable			= regulator_enable_regmap,
    126	.disable		= regulator_disable_regmap,
    127	.list_voltage		= regulator_list_voltage_linear,
    128	.map_voltage		= regulator_map_voltage_linear,
    129	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
    130	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
    131	/* TODO: add .set_suspend_mode */
    132};
    133
    134#define MAX77836_LDO_REG(num)	{ \
    135	.name		= "LDO" # num, \
    136	.of_match	= of_match_ptr("LDO" # num), \
    137	.regulators_node = of_match_ptr("regulators"), \
    138	.id		= MAX77836_LDO ## num, \
    139	.ops		= &max77836_ldo_ops, \
    140	.type		= REGULATOR_VOLTAGE, \
    141	.owner		= THIS_MODULE, \
    142	.n_voltages	= MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM, \
    143	.min_uV		= MAX77836_REGULATOR_LDO_VOLTAGE_MIN, \
    144	.uV_step	= MAX77836_REGULATOR_LDO_VOLTAGE_STEP, \
    145	.enable_reg	= MAX77836_LDO_REG_CNFG1_LDO ## num, \
    146	.enable_mask	= MAX77836_CNFG1_LDO_PWRMD_MASK, \
    147	.vsel_reg	= MAX77836_LDO_REG_CNFG1_LDO ## num, \
    148	.vsel_mask	= MAX77836_CNFG1_LDO_TV_MASK, \
    149}
    150
    151static const struct regulator_desc max77836_supported_regulators[] = {
    152	[MAX14577_SAFEOUT] = MAX14577_SAFEOUT_REG,
    153	[MAX14577_CHARGER] = MAX14577_CHARGER_REG,
    154	[MAX77836_LDO1] = MAX77836_LDO_REG(1),
    155	[MAX77836_LDO2] = MAX77836_LDO_REG(2),
    156};
    157
    158/*
    159 * Registers for regulators of max77836 use different I2C slave addresses so
    160 * different regmaps must be used for them.
    161 *
    162 * Returns proper regmap for accessing regulator passed by id.
    163 */
    164static struct regmap *max14577_get_regmap(struct max14577 *max14577,
    165		int reg_id)
    166{
    167	switch (max14577->dev_type) {
    168	case MAXIM_DEVICE_TYPE_MAX77836:
    169		switch (reg_id) {
    170		case MAX77836_SAFEOUT ... MAX77836_CHARGER:
    171			return max14577->regmap;
    172		default:
    173			/* MAX77836_LDO1 ... MAX77836_LDO2 */
    174			return max14577->regmap_pmic;
    175		}
    176
    177	case MAXIM_DEVICE_TYPE_MAX14577:
    178	default:
    179		return max14577->regmap;
    180	}
    181}
    182
    183static int max14577_regulator_probe(struct platform_device *pdev)
    184{
    185	struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
    186	struct max14577_platform_data *pdata = dev_get_platdata(max14577->dev);
    187	int i, ret = 0;
    188	struct regulator_config config = {};
    189	const struct regulator_desc *supported_regulators;
    190	unsigned int supported_regulators_size;
    191	enum maxim_device_type dev_type = max14577->dev_type;
    192
    193	switch (dev_type) {
    194	case MAXIM_DEVICE_TYPE_MAX77836:
    195		supported_regulators = max77836_supported_regulators;
    196		supported_regulators_size = ARRAY_SIZE(max77836_supported_regulators);
    197		break;
    198	case MAXIM_DEVICE_TYPE_MAX14577:
    199	default:
    200		supported_regulators = max14577_supported_regulators;
    201		supported_regulators_size = ARRAY_SIZE(max14577_supported_regulators);
    202	}
    203
    204	config.dev = max14577->dev;
    205	config.driver_data = max14577;
    206
    207	for (i = 0; i < supported_regulators_size; i++) {
    208		struct regulator_dev *regulator;
    209		/*
    210		 * Index of supported_regulators[] is also the id and must
    211		 * match index of pdata->regulators[].
    212		 */
    213		if (pdata && pdata->regulators) {
    214			config.init_data = pdata->regulators[i].initdata;
    215			config.of_node = pdata->regulators[i].of_node;
    216		}
    217		config.regmap = max14577_get_regmap(max14577,
    218				supported_regulators[i].id);
    219
    220		regulator = devm_regulator_register(&pdev->dev,
    221				&supported_regulators[i], &config);
    222		if (IS_ERR(regulator)) {
    223			ret = PTR_ERR(regulator);
    224			dev_err(&pdev->dev,
    225					"Regulator init failed for %d/%s with error: %d\n",
    226					i, supported_regulators[i].name, ret);
    227			return ret;
    228		}
    229	}
    230
    231	return ret;
    232}
    233
    234static const struct platform_device_id max14577_regulator_id[] = {
    235	{ "max14577-regulator", MAXIM_DEVICE_TYPE_MAX14577, },
    236	{ "max77836-regulator", MAXIM_DEVICE_TYPE_MAX77836, },
    237	{ }
    238};
    239MODULE_DEVICE_TABLE(platform, max14577_regulator_id);
    240
    241static struct platform_driver max14577_regulator_driver = {
    242	.driver = {
    243		   .name = "max14577-regulator",
    244		   },
    245	.probe		= max14577_regulator_probe,
    246	.id_table	= max14577_regulator_id,
    247};
    248
    249static int __init max14577_regulator_init(void)
    250{
    251	BUILD_BUG_ON(ARRAY_SIZE(max14577_supported_regulators) != MAX14577_REGULATOR_NUM);
    252	BUILD_BUG_ON(ARRAY_SIZE(max77836_supported_regulators) != MAX77836_REGULATOR_NUM);
    253
    254	BUILD_BUG_ON(MAX77836_REGULATOR_LDO_VOLTAGE_MIN +
    255			(MAX77836_REGULATOR_LDO_VOLTAGE_STEP *
    256			  (MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM - 1)) !=
    257			MAX77836_REGULATOR_LDO_VOLTAGE_MAX);
    258
    259	return platform_driver_register(&max14577_regulator_driver);
    260}
    261subsys_initcall(max14577_regulator_init);
    262
    263static void __exit max14577_regulator_exit(void)
    264{
    265	platform_driver_unregister(&max14577_regulator_driver);
    266}
    267module_exit(max14577_regulator_exit);
    268
    269MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>");
    270MODULE_DESCRIPTION("Maxim 14577/77836 regulator driver");
    271MODULE_LICENSE("GPL");