1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Regulators driver for Maxim max8925
4 *
5 * Copyright (C) 2009 Marvell International Ltd.
6 * Haojian Zhuang <haojian.zhuang@marvell.com>
7 */
8#include <linux/kernel.h>
9#include <linux/module.h>
10#include <linux/init.h>
11#include <linux/err.h>
12#include <linux/i2c.h>
13#include <linux/platform_device.h>
14#include <linux/regulator/driver.h>
15#include <linux/regulator/machine.h>
16#include <linux/mfd/max8925.h>
17#include <linux/of.h>
18#include <linux/regulator/of_regulator.h>
19
20#define SD1_DVM_VMIN 850000
21#define SD1_DVM_VMAX 1000000
22#define SD1_DVM_STEP 50000
23#define SD1_DVM_SHIFT 5 /* SDCTL1 bit5 */
24#define SD1_DVM_EN 6 /* SDV1 bit 6 */
25
26/* bit definitions in LDO control registers */
27#define LDO_SEQ_I2C 0x7 /* Power U/D by i2c */
28#define LDO_SEQ_MASK 0x7 /* Power U/D sequence mask */
29#define LDO_SEQ_SHIFT 2 /* Power U/D sequence offset */
30#define LDO_I2C_EN 0x1 /* Enable by i2c */
31#define LDO_I2C_EN_MASK 0x1 /* Enable mask by i2c */
32#define LDO_I2C_EN_SHIFT 0 /* Enable offset by i2c */
33
34struct max8925_regulator_info {
35 struct regulator_desc desc;
36 struct i2c_client *i2c;
37
38 int vol_reg;
39 int enable_reg;
40};
41
42static int max8925_set_voltage_sel(struct regulator_dev *rdev,
43 unsigned int selector)
44{
45 struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
46 unsigned char mask = rdev->desc->n_voltages - 1;
47
48 return max8925_set_bits(info->i2c, info->vol_reg, mask, selector);
49}
50
51static int max8925_get_voltage_sel(struct regulator_dev *rdev)
52{
53 struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
54 unsigned char data, mask;
55 int ret;
56
57 ret = max8925_reg_read(info->i2c, info->vol_reg);
58 if (ret < 0)
59 return ret;
60 mask = rdev->desc->n_voltages - 1;
61 data = ret & mask;
62
63 return data;
64}
65
66static int max8925_enable(struct regulator_dev *rdev)
67{
68 struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
69
70 return max8925_set_bits(info->i2c, info->enable_reg,
71 LDO_SEQ_MASK << LDO_SEQ_SHIFT |
72 LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT,
73 LDO_SEQ_I2C << LDO_SEQ_SHIFT |
74 LDO_I2C_EN << LDO_I2C_EN_SHIFT);
75}
76
77static int max8925_disable(struct regulator_dev *rdev)
78{
79 struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
80
81 return max8925_set_bits(info->i2c, info->enable_reg,
82 LDO_SEQ_MASK << LDO_SEQ_SHIFT |
83 LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT,
84 LDO_SEQ_I2C << LDO_SEQ_SHIFT);
85}
86
87static int max8925_is_enabled(struct regulator_dev *rdev)
88{
89 struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
90 int ldo_seq, ret;
91
92 ret = max8925_reg_read(info->i2c, info->enable_reg);
93 if (ret < 0)
94 return ret;
95 ldo_seq = (ret >> LDO_SEQ_SHIFT) & LDO_SEQ_MASK;
96 if (ldo_seq != LDO_SEQ_I2C)
97 return 1;
98 else
99 return ret & (LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT);
100}
101
102static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV)
103{
104 struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
105 unsigned char data, mask;
106
107 if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX)
108 return -EINVAL;
109
110 data = DIV_ROUND_UP(uV - SD1_DVM_VMIN, SD1_DVM_STEP);
111 data <<= SD1_DVM_SHIFT;
112 mask = 3 << SD1_DVM_SHIFT;
113
114 return max8925_set_bits(info->i2c, info->enable_reg, mask, data);
115}
116
117static int max8925_set_dvm_enable(struct regulator_dev *rdev)
118{
119 struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
120
121 return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN,
122 1 << SD1_DVM_EN);
123}
124
125static int max8925_set_dvm_disable(struct regulator_dev *rdev)
126{
127 struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
128
129 return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0);
130}
131
132static const struct regulator_ops max8925_regulator_sdv_ops = {
133 .map_voltage = regulator_map_voltage_linear,
134 .list_voltage = regulator_list_voltage_linear,
135 .set_voltage_sel = max8925_set_voltage_sel,
136 .get_voltage_sel = max8925_get_voltage_sel,
137 .enable = max8925_enable,
138 .disable = max8925_disable,
139 .is_enabled = max8925_is_enabled,
140 .set_suspend_voltage = max8925_set_dvm_voltage,
141 .set_suspend_enable = max8925_set_dvm_enable,
142 .set_suspend_disable = max8925_set_dvm_disable,
143};
144
145static const struct regulator_ops max8925_regulator_ldo_ops = {
146 .map_voltage = regulator_map_voltage_linear,
147 .list_voltage = regulator_list_voltage_linear,
148 .set_voltage_sel = max8925_set_voltage_sel,
149 .get_voltage_sel = max8925_get_voltage_sel,
150 .enable = max8925_enable,
151 .disable = max8925_disable,
152 .is_enabled = max8925_is_enabled,
153};
154
155#define MAX8925_SDV(_id, min, max, step) \
156{ \
157 .desc = { \
158 .name = "SDV" #_id, \
159 .of_match = of_match_ptr("SDV" #_id), \
160 .regulators_node = of_match_ptr("regulators"), \
161 .ops = &max8925_regulator_sdv_ops, \
162 .type = REGULATOR_VOLTAGE, \
163 .id = MAX8925_ID_SD##_id, \
164 .owner = THIS_MODULE, \
165 .n_voltages = 64, \
166 .min_uV = min * 1000, \
167 .uV_step = step * 1000, \
168 }, \
169 .vol_reg = MAX8925_SDV##_id, \
170 .enable_reg = MAX8925_SDCTL##_id, \
171}
172
173#define MAX8925_LDO(_id, min, max, step) \
174{ \
175 .desc = { \
176 .name = "LDO" #_id, \
177 .of_match = of_match_ptr("LDO" #_id), \
178 .regulators_node = of_match_ptr("regulators"), \
179 .ops = &max8925_regulator_ldo_ops, \
180 .type = REGULATOR_VOLTAGE, \
181 .id = MAX8925_ID_LDO##_id, \
182 .owner = THIS_MODULE, \
183 .n_voltages = 64, \
184 .min_uV = min * 1000, \
185 .uV_step = step * 1000, \
186 }, \
187 .vol_reg = MAX8925_LDOVOUT##_id, \
188 .enable_reg = MAX8925_LDOCTL##_id, \
189}
190
191static struct max8925_regulator_info max8925_regulator_info[] = {
192 MAX8925_SDV(1, 637.5, 1425, 12.5),
193 MAX8925_SDV(2, 650, 2225, 25),
194 MAX8925_SDV(3, 750, 3900, 50),
195
196 MAX8925_LDO(1, 750, 3900, 50),
197 MAX8925_LDO(2, 650, 2250, 25),
198 MAX8925_LDO(3, 650, 2250, 25),
199 MAX8925_LDO(4, 750, 3900, 50),
200 MAX8925_LDO(5, 750, 3900, 50),
201 MAX8925_LDO(6, 750, 3900, 50),
202 MAX8925_LDO(7, 750, 3900, 50),
203 MAX8925_LDO(8, 750, 3900, 50),
204 MAX8925_LDO(9, 750, 3900, 50),
205 MAX8925_LDO(10, 750, 3900, 50),
206 MAX8925_LDO(11, 750, 3900, 50),
207 MAX8925_LDO(12, 750, 3900, 50),
208 MAX8925_LDO(13, 750, 3900, 50),
209 MAX8925_LDO(14, 750, 3900, 50),
210 MAX8925_LDO(15, 750, 3900, 50),
211 MAX8925_LDO(16, 750, 3900, 50),
212 MAX8925_LDO(17, 650, 2250, 25),
213 MAX8925_LDO(18, 650, 2250, 25),
214 MAX8925_LDO(19, 750, 3900, 50),
215 MAX8925_LDO(20, 750, 3900, 50),
216};
217
218static int max8925_regulator_probe(struct platform_device *pdev)
219{
220 struct max8925_chip *chip = dev_get_drvdata(dev: pdev->dev.parent);
221 struct regulator_init_data *pdata = dev_get_platdata(dev: &pdev->dev);
222 struct regulator_config config = { };
223 struct max8925_regulator_info *ri;
224 struct resource *res;
225 struct regulator_dev *rdev;
226 int i;
227
228 res = platform_get_resource(pdev, IORESOURCE_REG, 0);
229 if (!res) {
230 dev_err(&pdev->dev, "No REG resource!\n");
231 return -EINVAL;
232 }
233 for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) {
234 ri = &max8925_regulator_info[i];
235 if (ri->vol_reg == res->start)
236 break;
237 }
238
239 if (i == ARRAY_SIZE(max8925_regulator_info)) {
240 dev_err(&pdev->dev, "Failed to find regulator %llu\n",
241 (unsigned long long)res->start);
242 return -EINVAL;
243 }
244 ri->i2c = chip->i2c;
245
246 config.dev = chip->dev;
247 config.driver_data = ri;
248
249 if (pdata)
250 config.init_data = pdata;
251
252 rdev = devm_regulator_register(dev: &pdev->dev, regulator_desc: &ri->desc, config: &config);
253 if (IS_ERR(ptr: rdev)) {
254 dev_err(&pdev->dev, "failed to register regulator %s\n",
255 ri->desc.name);
256 return PTR_ERR(ptr: rdev);
257 }
258
259 platform_set_drvdata(pdev, data: rdev);
260 return 0;
261}
262
263static struct platform_driver max8925_regulator_driver = {
264 .driver = {
265 .name = "max8925-regulator",
266 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
267 },
268 .probe = max8925_regulator_probe,
269};
270
271static int __init max8925_regulator_init(void)
272{
273 return platform_driver_register(&max8925_regulator_driver);
274}
275subsys_initcall(max8925_regulator_init);
276
277static void __exit max8925_regulator_exit(void)
278{
279 platform_driver_unregister(&max8925_regulator_driver);
280}
281module_exit(max8925_regulator_exit);
282
283MODULE_LICENSE("GPL");
284MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
285MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC");
286MODULE_ALIAS("platform:max8925-regulator");
287

source code of linux/drivers/regulator/max8925-regulator.c