1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (c) 2019-2020, The Linux Foundation. All rights reserved.
  4 * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
  5 * Copyright (c) 2024 Linaro Limited
  6 */
  7
  8#include <linux/array_size.h>
  9#include <linux/bits.h>
 10#include <linux/device.h>
 11#include <linux/math.h>
 12#include <linux/module.h>
 13#include <linux/of.h>
 14#include <linux/platform_device.h>
 15#include <linux/regmap.h>
 16#include <linux/regulator/driver.h>
 17
 18#include <asm/byteorder.h>
 19
 20#define DEFAULT_VOLTAGE_STEPPER_RATE	38400
 21
 22#define LDO_STEPPER_CTL_REG		0x3b
 23#define STEP_RATE_MASK			GENMASK(1, 0)
 24
 25#define LDO_VSET_LB_REG			0x40
 26
 27#define LDO_ENABLE_REG			0x46
 28#define ENABLE_BIT			BIT(7)
 29
 30struct pm8008_regulator {
 31	struct regmap		*regmap;
 32	struct regulator_desc	desc;
 33	unsigned int		base;
 34};
 35
 36struct pm8008_regulator_data {
 37	const char			*name;
 38	const char			*supply_name;
 39	unsigned int			base;
 40	int				min_dropout_uV;
 41	const struct linear_range	*voltage_range;
 42};
 43
 44static const struct linear_range nldo_ranges[] = {
 45	REGULATOR_LINEAR_RANGE(528000, 0, 122, 8000),
 46};
 47
 48static const struct linear_range pldo_ranges[] = {
 49	REGULATOR_LINEAR_RANGE(1504000, 0, 237, 8000),
 50};
 51
 52static const struct pm8008_regulator_data pm8008_reg_data[] = {
 53	{ "ldo1", "vdd-l1-l2", 0x4000, 225000, nldo_ranges, },
 54	{ "ldo2", "vdd-l1-l2", 0x4100, 225000, nldo_ranges, },
 55	{ "ldo3", "vdd-l3-l4", 0x4200, 300000, pldo_ranges, },
 56	{ "ldo4", "vdd-l3-l4", 0x4300, 300000, pldo_ranges, },
 57	{ "ldo5", "vdd-l5",    0x4400, 200000, pldo_ranges, },
 58	{ "ldo6", "vdd-l6",    0x4500, 200000, pldo_ranges, },
 59	{ "ldo7", "vdd-l7",    0x4600, 200000, pldo_ranges, },
 60};
 61
 62static int pm8008_regulator_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel)
 63{
 64	struct pm8008_regulator *preg = rdev_get_drvdata(rdev);
 65	unsigned int mV;
 66	__le16 val;
 67	int ret;
 68
 69	ret = regulator_list_voltage_linear_range(rdev, sel);
 70	if (ret < 0)
 71		return ret;
 72
 73	mV = DIV_ROUND_UP(ret, 1000);
 74
 75	val = cpu_to_le16(mV);
 76
 77	ret = regmap_bulk_write(preg->regmap, preg->base + LDO_VSET_LB_REG,
 78			&val, sizeof(val));
 79	if (ret < 0)
 80		return ret;
 81
 82	return 0;
 83}
 84
 85static int pm8008_regulator_get_voltage_sel(struct regulator_dev *rdev)
 86{
 87	struct pm8008_regulator *preg = rdev_get_drvdata(rdev);
 88	unsigned int uV;
 89	__le16 val;
 90	int ret;
 91
 92	ret = regmap_bulk_read(preg->regmap, preg->base + LDO_VSET_LB_REG,
 93			&val, sizeof(val));
 94	if (ret < 0)
 95		return ret;
 96
 97	uV = le16_to_cpu(val) * 1000;
 98
 99	return (uV - preg->desc.min_uV) / preg->desc.uV_step;
100}
101
102static const struct regulator_ops pm8008_regulator_ops = {
103	.list_voltage		= regulator_list_voltage_linear,
104	.set_voltage_sel	= pm8008_regulator_set_voltage_sel,
105	.get_voltage_sel	= pm8008_regulator_get_voltage_sel,
106	.enable			= regulator_enable_regmap,
107	.disable		= regulator_disable_regmap,
108	.is_enabled		= regulator_is_enabled_regmap,
109};
110
111static int pm8008_regulator_probe(struct platform_device *pdev)
112{
113	const struct pm8008_regulator_data *data;
114	struct regulator_config config = {};
115	struct device *dev = &pdev->dev;
116	struct pm8008_regulator *preg;
117	struct regulator_desc *desc;
118	struct regulator_dev *rdev;
119	struct regmap *regmap;
120	unsigned int val;
121	int ret, i;
122
123	regmap = dev_get_regmap(dev->parent, "secondary");
124	if (!regmap)
125		return -EINVAL;
126
127	for (i = 0; i < ARRAY_SIZE(pm8008_reg_data); i++) {
128		data = &pm8008_reg_data[i];
129
130		preg = devm_kzalloc(dev, sizeof(*preg), GFP_KERNEL);
131		if (!preg)
132			return -ENOMEM;
133
134		preg->regmap = regmap;
135		preg->base = data->base;
136
137		desc = &preg->desc;
138
139		desc->name = data->name;
140		desc->supply_name = data->supply_name;
141		desc->of_match = data->name;
142		desc->regulators_node = of_match_ptr("regulators");
143		desc->ops = &pm8008_regulator_ops;
144		desc->type = REGULATOR_VOLTAGE;
145		desc->owner = THIS_MODULE;
146
147		desc->linear_ranges = data->voltage_range;
148		desc->n_linear_ranges = 1;
149		desc->uV_step = desc->linear_ranges[0].step;
150		desc->min_uV = desc->linear_ranges[0].min;
151		desc->n_voltages = linear_range_values_in_range(&desc->linear_ranges[0]);
152
153		ret = regmap_read(regmap, preg->base + LDO_STEPPER_CTL_REG, &val);
154		if (ret < 0) {
155			dev_err(dev, "failed to read step rate: %d\n", ret);
156			return ret;
157		}
158		val &= STEP_RATE_MASK;
159		desc->ramp_delay = DEFAULT_VOLTAGE_STEPPER_RATE >> val;
160
161		desc->min_dropout_uV = data->min_dropout_uV;
162
163		desc->enable_reg = preg->base + LDO_ENABLE_REG;
164		desc->enable_mask = ENABLE_BIT;
165
166		config.dev = dev->parent;
167		config.driver_data = preg;
168		config.regmap = regmap;
169
170		rdev = devm_regulator_register(dev, desc, &config);
171		if (IS_ERR(rdev)) {
172			ret = PTR_ERR(rdev);
173			dev_err(dev, "failed to register regulator %s: %d\n",
174					desc->name, ret);
175			return ret;
176		}
177	}
178
179	return 0;
180}
181
182static const struct platform_device_id pm8008_regulator_id_table[] = {
183	{ "pm8008-regulator" },
184	{ }
185};
186MODULE_DEVICE_TABLE(platform, pm8008_regulator_id_table);
187
188static struct platform_driver pm8008_regulator_driver = {
189	.driver	= {
190		.name = "qcom-pm8008-regulator",
191	},
192	.probe = pm8008_regulator_probe,
193	.id_table = pm8008_regulator_id_table,
194};
195module_platform_driver(pm8008_regulator_driver);
196
197MODULE_DESCRIPTION("Qualcomm PM8008 PMIC regulator driver");
198MODULE_LICENSE("GPL");