tjh.dev
Linux kernel mirror (for testing)
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linux
1// SPDX-License-Identifier: GPL-2.0
2// Copyright (C) 2018 ROHM Semiconductors
3// bd70528-regulator.c ROHM BD70528MWV regulator driver
4
5#include <linux/delay.h>
6#include <linux/err.h>
7#include <linux/gpio.h>
8#include <linux/interrupt.h>
9#include <linux/kernel.h>
10#include <linux/mfd/rohm-bd70528.h>
11#include <linux/module.h>
12#include <linux/of.h>
13#include <linux/platform_device.h>
14#include <linux/regmap.h>
15#include <linux/regulator/driver.h>
16#include <linux/regulator/machine.h>
17#include <linux/regulator/of_regulator.h>
18#include <linux/slab.h>
19
20#define BUCK_RAMPRATE_250MV 0
21#define BUCK_RAMPRATE_125MV 1
22#define BUCK_RAMP_MAX 250
23
24static const struct regulator_linear_range bd70528_buck1_volts[] = {
25 REGULATOR_LINEAR_RANGE(1200000, 0x00, 0x1, 600000),
26 REGULATOR_LINEAR_RANGE(2750000, 0x2, 0xf, 50000),
27};
28static const struct regulator_linear_range bd70528_buck2_volts[] = {
29 REGULATOR_LINEAR_RANGE(1200000, 0x00, 0x1, 300000),
30 REGULATOR_LINEAR_RANGE(1550000, 0x2, 0xd, 50000),
31 REGULATOR_LINEAR_RANGE(3000000, 0xe, 0xf, 300000),
32};
33static const struct regulator_linear_range bd70528_buck3_volts[] = {
34 REGULATOR_LINEAR_RANGE(800000, 0x00, 0xd, 50000),
35 REGULATOR_LINEAR_RANGE(1800000, 0xe, 0xf, 0),
36};
37
38/* All LDOs have same voltage ranges */
39static const struct regulator_linear_range bd70528_ldo_volts[] = {
40 REGULATOR_LINEAR_RANGE(1650000, 0x0, 0x07, 50000),
41 REGULATOR_LINEAR_RANGE(2100000, 0x8, 0x0f, 100000),
42 REGULATOR_LINEAR_RANGE(2850000, 0x10, 0x19, 50000),
43 REGULATOR_LINEAR_RANGE(3300000, 0x19, 0x1f, 0),
44};
45
46/* Also both LEDs support same voltages */
47static const unsigned int led_volts[] = {
48 20000, 30000
49};
50
51static int bd70528_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
52{
53 if (ramp_delay > 0 && ramp_delay <= BUCK_RAMP_MAX) {
54 unsigned int ramp_value = BUCK_RAMPRATE_250MV;
55
56 if (ramp_delay <= 125)
57 ramp_value = BUCK_RAMPRATE_125MV;
58
59 return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
60 BD70528_MASK_BUCK_RAMP,
61 ramp_value << BD70528_SIFT_BUCK_RAMP);
62 }
63 dev_err(&rdev->dev, "%s: ramp_delay: %d not supported\n",
64 rdev->desc->name, ramp_delay);
65 return -EINVAL;
66}
67
68static int bd70528_led_set_voltage_sel(struct regulator_dev *rdev,
69 unsigned int sel)
70{
71 int ret;
72
73 ret = regulator_is_enabled_regmap(rdev);
74 if (ret < 0)
75 return ret;
76
77 if (ret == 0)
78 return regulator_set_voltage_sel_regmap(rdev, sel);
79
80 dev_err(&rdev->dev,
81 "LED voltage change not allowed when led is enabled\n");
82
83 return -EBUSY;
84}
85
86static const struct regulator_ops bd70528_buck_ops = {
87 .enable = regulator_enable_regmap,
88 .disable = regulator_disable_regmap,
89 .is_enabled = regulator_is_enabled_regmap,
90 .list_voltage = regulator_list_voltage_linear_range,
91 .set_voltage_sel = regulator_set_voltage_sel_regmap,
92 .get_voltage_sel = regulator_get_voltage_sel_regmap,
93 .set_voltage_time_sel = regulator_set_voltage_time_sel,
94 .set_ramp_delay = bd70528_set_ramp_delay,
95};
96
97static const struct regulator_ops bd70528_ldo_ops = {
98 .enable = regulator_enable_regmap,
99 .disable = regulator_disable_regmap,
100 .is_enabled = regulator_is_enabled_regmap,
101 .list_voltage = regulator_list_voltage_linear_range,
102 .set_voltage_sel = regulator_set_voltage_sel_regmap,
103 .get_voltage_sel = regulator_get_voltage_sel_regmap,
104 .set_voltage_time_sel = regulator_set_voltage_time_sel,
105 .set_ramp_delay = bd70528_set_ramp_delay,
106};
107
108static const struct regulator_ops bd70528_led_ops = {
109 .enable = regulator_enable_regmap,
110 .disable = regulator_disable_regmap,
111 .is_enabled = regulator_is_enabled_regmap,
112 .list_voltage = regulator_list_voltage_table,
113 .set_voltage_sel = bd70528_led_set_voltage_sel,
114 .get_voltage_sel = regulator_get_voltage_sel_regmap,
115};
116
117static const struct regulator_desc bd70528_desc[] = {
118 {
119 .name = "buck1",
120 .of_match = of_match_ptr("BUCK1"),
121 .regulators_node = of_match_ptr("regulators"),
122 .id = BD70528_BUCK1,
123 .ops = &bd70528_buck_ops,
124 .type = REGULATOR_VOLTAGE,
125 .linear_ranges = bd70528_buck1_volts,
126 .n_linear_ranges = ARRAY_SIZE(bd70528_buck1_volts),
127 .n_voltages = BD70528_BUCK_VOLTS,
128 .enable_reg = BD70528_REG_BUCK1_EN,
129 .enable_mask = BD70528_MASK_RUN_EN,
130 .vsel_reg = BD70528_REG_BUCK1_VOLT,
131 .vsel_mask = BD70528_MASK_BUCK_VOLT,
132 .owner = THIS_MODULE,
133 },
134 {
135 .name = "buck2",
136 .of_match = of_match_ptr("BUCK2"),
137 .regulators_node = of_match_ptr("regulators"),
138 .id = BD70528_BUCK2,
139 .ops = &bd70528_buck_ops,
140 .type = REGULATOR_VOLTAGE,
141 .linear_ranges = bd70528_buck2_volts,
142 .n_linear_ranges = ARRAY_SIZE(bd70528_buck2_volts),
143 .n_voltages = BD70528_BUCK_VOLTS,
144 .enable_reg = BD70528_REG_BUCK2_EN,
145 .enable_mask = BD70528_MASK_RUN_EN,
146 .vsel_reg = BD70528_REG_BUCK2_VOLT,
147 .vsel_mask = BD70528_MASK_BUCK_VOLT,
148 .owner = THIS_MODULE,
149 },
150 {
151 .name = "buck3",
152 .of_match = of_match_ptr("BUCK3"),
153 .regulators_node = of_match_ptr("regulators"),
154 .id = BD70528_BUCK3,
155 .ops = &bd70528_buck_ops,
156 .type = REGULATOR_VOLTAGE,
157 .linear_ranges = bd70528_buck3_volts,
158 .n_linear_ranges = ARRAY_SIZE(bd70528_buck3_volts),
159 .n_voltages = BD70528_BUCK_VOLTS,
160 .enable_reg = BD70528_REG_BUCK3_EN,
161 .enable_mask = BD70528_MASK_RUN_EN,
162 .vsel_reg = BD70528_REG_BUCK3_VOLT,
163 .vsel_mask = BD70528_MASK_BUCK_VOLT,
164 .owner = THIS_MODULE,
165 },
166 {
167 .name = "ldo1",
168 .of_match = of_match_ptr("LDO1"),
169 .regulators_node = of_match_ptr("regulators"),
170 .id = BD70528_LDO1,
171 .ops = &bd70528_ldo_ops,
172 .type = REGULATOR_VOLTAGE,
173 .linear_ranges = bd70528_ldo_volts,
174 .n_linear_ranges = ARRAY_SIZE(bd70528_ldo_volts),
175 .n_voltages = BD70528_LDO_VOLTS,
176 .enable_reg = BD70528_REG_LDO1_EN,
177 .enable_mask = BD70528_MASK_RUN_EN,
178 .vsel_reg = BD70528_REG_LDO1_VOLT,
179 .vsel_mask = BD70528_MASK_LDO_VOLT,
180 .owner = THIS_MODULE,
181 },
182 {
183 .name = "ldo2",
184 .of_match = of_match_ptr("LDO2"),
185 .regulators_node = of_match_ptr("regulators"),
186 .id = BD70528_LDO2,
187 .ops = &bd70528_ldo_ops,
188 .type = REGULATOR_VOLTAGE,
189 .linear_ranges = bd70528_ldo_volts,
190 .n_linear_ranges = ARRAY_SIZE(bd70528_ldo_volts),
191 .n_voltages = BD70528_LDO_VOLTS,
192 .enable_reg = BD70528_REG_LDO2_EN,
193 .enable_mask = BD70528_MASK_RUN_EN,
194 .vsel_reg = BD70528_REG_LDO2_VOLT,
195 .vsel_mask = BD70528_MASK_LDO_VOLT,
196 .owner = THIS_MODULE,
197 },
198 {
199 .name = "ldo3",
200 .of_match = of_match_ptr("LDO3"),
201 .regulators_node = of_match_ptr("regulators"),
202 .id = BD70528_LDO3,
203 .ops = &bd70528_ldo_ops,
204 .type = REGULATOR_VOLTAGE,
205 .linear_ranges = bd70528_ldo_volts,
206 .n_linear_ranges = ARRAY_SIZE(bd70528_ldo_volts),
207 .n_voltages = BD70528_LDO_VOLTS,
208 .enable_reg = BD70528_REG_LDO3_EN,
209 .enable_mask = BD70528_MASK_RUN_EN,
210 .vsel_reg = BD70528_REG_LDO3_VOLT,
211 .vsel_mask = BD70528_MASK_LDO_VOLT,
212 .owner = THIS_MODULE,
213 },
214 {
215 .name = "ldo_led1",
216 .of_match = of_match_ptr("LDO_LED1"),
217 .regulators_node = of_match_ptr("regulators"),
218 .id = BD70528_LED1,
219 .ops = &bd70528_led_ops,
220 .type = REGULATOR_VOLTAGE,
221 .volt_table = &led_volts[0],
222 .n_voltages = ARRAY_SIZE(led_volts),
223 .enable_reg = BD70528_REG_LED_EN,
224 .enable_mask = BD70528_MASK_LED1_EN,
225 .vsel_reg = BD70528_REG_LED_VOLT,
226 .vsel_mask = BD70528_MASK_LED1_VOLT,
227 .owner = THIS_MODULE,
228 },
229 {
230 .name = "ldo_led2",
231 .of_match = of_match_ptr("LDO_LED2"),
232 .regulators_node = of_match_ptr("regulators"),
233 .id = BD70528_LED2,
234 .ops = &bd70528_led_ops,
235 .type = REGULATOR_VOLTAGE,
236 .volt_table = &led_volts[0],
237 .n_voltages = ARRAY_SIZE(led_volts),
238 .enable_reg = BD70528_REG_LED_EN,
239 .enable_mask = BD70528_MASK_LED2_EN,
240 .vsel_reg = BD70528_REG_LED_VOLT,
241 .vsel_mask = BD70528_MASK_LED2_VOLT,
242 .owner = THIS_MODULE,
243 },
244
245};
246
247static int bd70528_probe(struct platform_device *pdev)
248{
249 struct rohm_regmap_dev *bd70528;
250 int i;
251 struct regulator_config config = {
252 .dev = pdev->dev.parent,
253 };
254
255 bd70528 = dev_get_drvdata(pdev->dev.parent);
256 if (!bd70528) {
257 dev_err(&pdev->dev, "No MFD driver data\n");
258 return -EINVAL;
259 }
260
261 config.regmap = bd70528->regmap;
262
263 for (i = 0; i < ARRAY_SIZE(bd70528_desc); i++) {
264 struct regulator_dev *rdev;
265
266 rdev = devm_regulator_register(&pdev->dev, &bd70528_desc[i],
267 &config);
268 if (IS_ERR(rdev)) {
269 dev_err(&pdev->dev,
270 "failed to register %s regulator\n",
271 bd70528_desc[i].name);
272 return PTR_ERR(rdev);
273 }
274 }
275 return 0;
276}
277
278static struct platform_driver bd70528_regulator = {
279 .driver = {
280 .name = "bd70528-pmic"
281 },
282 .probe = bd70528_probe,
283};
284
285module_platform_driver(bd70528_regulator);
286
287MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
288MODULE_DESCRIPTION("BD70528 voltage regulator driver");
289MODULE_LICENSE("GPL");