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/drivers/regulator/aat2870-regulator.c

http://github.com/mirrors/linux
C | 200 lines | 158 code | 35 blank | 7 comment | 9 complexity | 363e7b21bdb24f5e6b65ebfb4f852394 MD5 | raw file
  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * linux/drivers/regulator/aat2870-regulator.c
  4 *
  5 * Copyright (c) 2011, NVIDIA Corporation.
  6 * Author: Jin Park <jinyoungp@nvidia.com>
  7 */
  8
  9#include <linux/kernel.h>
 10#include <linux/init.h>
 11#include <linux/err.h>
 12#include <linux/module.h>
 13#include <linux/slab.h>
 14#include <linux/platform_device.h>
 15#include <linux/regulator/driver.h>
 16#include <linux/regulator/machine.h>
 17#include <linux/mfd/aat2870.h>
 18
 19struct aat2870_regulator {
 20	struct aat2870_data *aat2870;
 21	struct regulator_desc desc;
 22
 23	u8 enable_addr;
 24	u8 enable_shift;
 25	u8 enable_mask;
 26
 27	u8 voltage_addr;
 28	u8 voltage_shift;
 29	u8 voltage_mask;
 30};
 31
 32static int aat2870_ldo_set_voltage_sel(struct regulator_dev *rdev,
 33				       unsigned selector)
 34{
 35	struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
 36	struct aat2870_data *aat2870 = ri->aat2870;
 37
 38	return aat2870->update(aat2870, ri->voltage_addr, ri->voltage_mask,
 39			       selector << ri->voltage_shift);
 40}
 41
 42static int aat2870_ldo_get_voltage_sel(struct regulator_dev *rdev)
 43{
 44	struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
 45	struct aat2870_data *aat2870 = ri->aat2870;
 46	u8 val;
 47	int ret;
 48
 49	ret = aat2870->read(aat2870, ri->voltage_addr, &val);
 50	if (ret)
 51		return ret;
 52
 53	return (val & ri->voltage_mask) >> ri->voltage_shift;
 54}
 55
 56static int aat2870_ldo_enable(struct regulator_dev *rdev)
 57{
 58	struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
 59	struct aat2870_data *aat2870 = ri->aat2870;
 60
 61	return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask,
 62			       ri->enable_mask);
 63}
 64
 65static int aat2870_ldo_disable(struct regulator_dev *rdev)
 66{
 67	struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
 68	struct aat2870_data *aat2870 = ri->aat2870;
 69
 70	return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask, 0);
 71}
 72
 73static int aat2870_ldo_is_enabled(struct regulator_dev *rdev)
 74{
 75	struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
 76	struct aat2870_data *aat2870 = ri->aat2870;
 77	u8 val;
 78	int ret;
 79
 80	ret = aat2870->read(aat2870, ri->enable_addr, &val);
 81	if (ret)
 82		return ret;
 83
 84	return val & ri->enable_mask ? 1 : 0;
 85}
 86
 87static const struct regulator_ops aat2870_ldo_ops = {
 88	.list_voltage = regulator_list_voltage_table,
 89	.map_voltage = regulator_map_voltage_ascend,
 90	.set_voltage_sel = aat2870_ldo_set_voltage_sel,
 91	.get_voltage_sel = aat2870_ldo_get_voltage_sel,
 92	.enable = aat2870_ldo_enable,
 93	.disable = aat2870_ldo_disable,
 94	.is_enabled = aat2870_ldo_is_enabled,
 95};
 96
 97static const unsigned int aat2870_ldo_voltages[] = {
 98	1200000, 1300000, 1500000, 1600000,
 99	1800000, 2000000, 2200000, 2500000,
100	2600000, 2700000, 2800000, 2900000,
101	3000000, 3100000, 3200000, 3300000,
102};
103
104#define AAT2870_LDO(ids)				\
105	{						\
106		.desc = {				\
107			.name = #ids,			\
108			.id = AAT2870_ID_##ids,		\
109			.n_voltages = ARRAY_SIZE(aat2870_ldo_voltages),	\
110			.volt_table = aat2870_ldo_voltages, \
111			.ops = &aat2870_ldo_ops,	\
112			.type = REGULATOR_VOLTAGE,	\
113			.owner = THIS_MODULE,		\
114		},					\
115	}
116
117static struct aat2870_regulator aat2870_regulators[] = {
118	AAT2870_LDO(LDOA),
119	AAT2870_LDO(LDOB),
120	AAT2870_LDO(LDOC),
121	AAT2870_LDO(LDOD),
122};
123
124static struct aat2870_regulator *aat2870_get_regulator(int id)
125{
126	struct aat2870_regulator *ri = NULL;
127	int i;
128
129	for (i = 0; i < ARRAY_SIZE(aat2870_regulators); i++) {
130		ri = &aat2870_regulators[i];
131		if (ri->desc.id == id)
132			break;
133	}
134
135	if (i == ARRAY_SIZE(aat2870_regulators))
136		return NULL;
137
138	ri->enable_addr = AAT2870_LDO_EN;
139	ri->enable_shift = id - AAT2870_ID_LDOA;
140	ri->enable_mask = 0x1 << ri->enable_shift;
141
142	ri->voltage_addr = (id - AAT2870_ID_LDOA) / 2 ?
143			   AAT2870_LDO_CD : AAT2870_LDO_AB;
144	ri->voltage_shift = (id - AAT2870_ID_LDOA) % 2 ? 0 : 4;
145	ri->voltage_mask = 0xF << ri->voltage_shift;
146
147	return ri;
148}
149
150static int aat2870_regulator_probe(struct platform_device *pdev)
151{
152	struct aat2870_regulator *ri;
153	struct regulator_config config = { };
154	struct regulator_dev *rdev;
155
156	ri = aat2870_get_regulator(pdev->id);
157	if (!ri) {
158		dev_err(&pdev->dev, "Invalid device ID, %d\n", pdev->id);
159		return -EINVAL;
160	}
161	ri->aat2870 = dev_get_drvdata(pdev->dev.parent);
162
163	config.dev = &pdev->dev;
164	config.driver_data = ri;
165	config.init_data = dev_get_platdata(&pdev->dev);
166
167	rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config);
168	if (IS_ERR(rdev)) {
169		dev_err(&pdev->dev, "Failed to register regulator %s\n",
170			ri->desc.name);
171		return PTR_ERR(rdev);
172	}
173	platform_set_drvdata(pdev, rdev);
174
175	return 0;
176}
177
178static struct platform_driver aat2870_regulator_driver = {
179	.driver = {
180		.name	= "aat2870-regulator",
181	},
182	.probe	= aat2870_regulator_probe,
183};
184
185static int __init aat2870_regulator_init(void)
186{
187	return platform_driver_register(&aat2870_regulator_driver);
188}
189subsys_initcall(aat2870_regulator_init);
190
191static void __exit aat2870_regulator_exit(void)
192{
193	platform_driver_unregister(&aat2870_regulator_driver);
194}
195module_exit(aat2870_regulator_exit);
196
197MODULE_DESCRIPTION("AnalogicTech AAT2870 Regulator");
198MODULE_LICENSE("GPL");
199MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>");
200MODULE_ALIAS("platform:aat2870-regulator");