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