1// SPDX-License-Identifier: GPL-2.0
2//
3// AWINIC AW37503 Regulator Driver
4//
5// Copyright (C) 2023 awinic. All Rights Reserved
6//
7// Author: <like@awinic.com>
8
9#include <linux/err.h>
10#include <linux/gpio/consumer.h>
11#include <linux/i2c.h>
12#include <linux/module.h>
13#include <linux/regmap.h>
14#include <linux/regulator/driver.h>
15#include <linux/regulator/machine.h>
16
17#define AW37503_REG_VPOS		0x00
18#define AW37503_REG_VNEG		0x01
19#define AW37503_REG_APPS		0x03
20#define AW37503_REG_CONTROL		0x04
21#define AW37503_REG_WPRTEN		0x21
22
23#define AW37503_VOUT_MASK		0x1F
24#define AW37503_VOUT_N_VOLTAGE		0x15
25#define AW37503_VOUT_VMIN		4000000
26#define AW37503_VOUT_VMAX		6000000
27#define AW37503_VOUT_STEP		100000
28
29#define AW37503_REG_APPS_DIS_VPOS	BIT(1)
30#define AW37503_REG_APPS_DIS_VNEG	BIT(0)
31
32#define AW37503_REGULATOR_ID_VPOS	0
33#define AW37503_REGULATOR_ID_VNEG	1
34#define AW37503_MAX_REGULATORS		2
35
36struct aw37503_reg_pdata {
37	struct gpio_desc *en_gpiod;
38	int ena_gpio_state;
39};
40
41struct aw37503_regulator {
42	struct device *dev;
43	struct aw37503_reg_pdata reg_pdata[AW37503_MAX_REGULATORS];
44};
45
46static int aw37503_regulator_enable(struct regulator_dev *rdev)
47{
48	struct aw37503_regulator *chip = rdev_get_drvdata(rdev);
49	int id = rdev_get_id(rdev);
50	struct aw37503_reg_pdata *rpdata = &chip->reg_pdata[id];
51	int ret;
52
53	if (!IS_ERR(rpdata->en_gpiod)) {
54		gpiod_set_value_cansleep(rpdata->en_gpiod, 1);
55		rpdata->ena_gpio_state = 1;
56	}
57
58	/* Hardware automatically enable discharge bit in enable */
59	if (rdev->constraints->active_discharge ==
60			REGULATOR_ACTIVE_DISCHARGE_DISABLE) {
61		ret = regulator_set_active_discharge_regmap(rdev, false);
62		if (ret < 0) {
63			dev_err(chip->dev, "Failed to disable active discharge: %d\n",
64				ret);
65			return ret;
66		}
67	}
68
69	return 0;
70}
71
72static int aw37503_regulator_disable(struct regulator_dev *rdev)
73{
74	struct aw37503_regulator *chip = rdev_get_drvdata(rdev);
75	int id = rdev_get_id(rdev);
76	struct aw37503_reg_pdata *rpdata = &chip->reg_pdata[id];
77
78	if (!IS_ERR(rpdata->en_gpiod)) {
79		gpiod_set_value_cansleep(rpdata->en_gpiod, 0);
80		rpdata->ena_gpio_state = 0;
81	}
82
83	return 0;
84}
85
86static int aw37503_regulator_is_enabled(struct regulator_dev *rdev)
87{
88	struct aw37503_regulator *chip = rdev_get_drvdata(rdev);
89	int id = rdev_get_id(rdev);
90	struct aw37503_reg_pdata *rpdata = &chip->reg_pdata[id];
91
92	if (!IS_ERR(rpdata->en_gpiod))
93		return rpdata->ena_gpio_state;
94
95	return 1;
96}
97
98static const struct regulator_ops aw37503_regulator_ops = {
99	.enable = aw37503_regulator_enable,
100	.disable = aw37503_regulator_disable,
101	.is_enabled = aw37503_regulator_is_enabled,
102	.list_voltage = regulator_list_voltage_linear,
103	.map_voltage = regulator_map_voltage_linear,
104	.get_voltage_sel = regulator_get_voltage_sel_regmap,
105	.set_voltage_sel = regulator_set_voltage_sel_regmap,
106	.set_active_discharge = regulator_set_active_discharge_regmap,
107};
108
109static int aw37503_of_parse_cb(struct device_node *np,
110				const struct regulator_desc *desc,
111				struct regulator_config *config)
112{
113	struct aw37503_regulator *chip = config->driver_data;
114	struct aw37503_reg_pdata *rpdata = &chip->reg_pdata[desc->id];
115	int ret;
116
117	rpdata->en_gpiod = devm_fwnode_gpiod_get(chip->dev, of_fwnode_handle(np),
118						 "enable", GPIOD_OUT_LOW,
119						 "enable");
120
121	if (IS_ERR(rpdata->en_gpiod)) {
122		ret = PTR_ERR(rpdata->en_gpiod);
123
124		/* Ignore the error other than probe defer */
125		if (ret == -EPROBE_DEFER)
126			return ret;
127		return 0;
128	}
129
130	return 0;
131}
132
133#define AW37503_REGULATOR_DESC(_id, _name)		\
134	[AW37503_REGULATOR_ID_##_id] = {		\
135		.name = "aw37503-"#_name,		\
136		.supply_name = "vin",			\
137		.id = AW37503_REGULATOR_ID_##_id,	\
138		.of_match = of_match_ptr(#_name),	\
139		.of_parse_cb = aw37503_of_parse_cb,	\
140		.ops = &aw37503_regulator_ops,		\
141		.n_voltages = AW37503_VOUT_N_VOLTAGE,	\
142		.min_uV = AW37503_VOUT_VMIN,		\
143		.uV_step = AW37503_VOUT_STEP,		\
144		.enable_time = 500,			\
145		.vsel_mask = AW37503_VOUT_MASK,	\
146		.vsel_reg = AW37503_REG_##_id,		\
147		.active_discharge_off = 0,			\
148		.active_discharge_on = AW37503_REG_APPS_DIS_##_id, \
149		.active_discharge_mask = AW37503_REG_APPS_DIS_##_id, \
150		.active_discharge_reg = AW37503_REG_APPS, \
151		.type = REGULATOR_VOLTAGE,		\
152		.owner = THIS_MODULE,			\
153	}
154
155static const struct regulator_desc aw_regs_desc[AW37503_MAX_REGULATORS] = {
156	AW37503_REGULATOR_DESC(VPOS, outp),
157	AW37503_REGULATOR_DESC(VNEG, outn),
158};
159
160static const struct regmap_range aw37503_no_reg_ranges[] = {
161	regmap_reg_range(AW37503_REG_CONTROL + 1,
162			 AW37503_REG_WPRTEN - 1),
163};
164
165static const struct regmap_access_table aw37503_no_reg_table = {
166	.no_ranges = aw37503_no_reg_ranges,
167	.n_no_ranges = ARRAY_SIZE(aw37503_no_reg_ranges),
168};
169
170static const struct regmap_config aw37503_regmap_config = {
171	.reg_bits	= 8,
172	.val_bits	= 8,
173	.max_register	= AW37503_REG_WPRTEN,
174	.rd_table	= &aw37503_no_reg_table,
175	.wr_table	= &aw37503_no_reg_table,
176};
177
178static int aw37503_probe(struct i2c_client *client)
179{
180	struct device *dev = &client->dev;
181	struct aw37503_regulator *chip;
182	struct regulator_dev *rdev;
183	struct regmap *regmap;
184	struct regulator_config config = { };
185	int id;
186
187	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
188	if (!chip)
189		return -ENOMEM;
190
191	regmap = devm_regmap_init_i2c(client, &aw37503_regmap_config);
192	if (IS_ERR(regmap))
193		return dev_err_probe(dev, PTR_ERR(regmap),
194				     "Failed to init regmap\n");
195
196	i2c_set_clientdata(client, chip);
197	chip->dev = dev;
198
199	config.regmap = regmap;
200	config.dev = dev;
201	config.driver_data = chip;
202
203	for (id = 0; id < AW37503_MAX_REGULATORS; ++id) {
204		rdev = devm_regulator_register(dev, &aw_regs_desc[id],
205					       &config);
206		if (IS_ERR(rdev))
207			return dev_err_probe(dev, PTR_ERR(rdev),
208					     "Failed to register regulator %s\n",
209					     aw_regs_desc[id].name);
210	}
211	return 0;
212}
213
214static const struct i2c_device_id aw37503_id[] = {
215	{.name = "aw37503",},
216	{},
217};
218MODULE_DEVICE_TABLE(i2c, aw37503_id);
219
220static const struct of_device_id aw37503_of_match[] = {
221	{.compatible = "awinic,aw37503",},
222	{ /* Sentinel */ },
223};
224
225MODULE_DEVICE_TABLE(of, aw37503_of_match);
226
227static struct i2c_driver aw37503_i2c_driver = {
228	.driver = {
229		.name = "aw37503",
230		.of_match_table = aw37503_of_match,
231	},
232	.probe = aw37503_probe,
233	.id_table = aw37503_id,
234};
235
236module_i2c_driver(aw37503_i2c_driver);
237
238MODULE_DESCRIPTION("aw37503 regulator driver");
239MODULE_AUTHOR("Alec Li <like@awinic.com>");
240MODULE_LICENSE("GPL");
241