1// SPDX-License-Identifier: GPL-2.0+
2//
3// Regulator support for WM8400
4//
5// Copyright 2008 Wolfson Microelectronics PLC.
6//
7// Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
8
9#include <linux/bug.h>
10#include <linux/err.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/regulator/driver.h>
14#include <linux/mfd/wm8400-private.h>
15
16static const struct linear_range wm8400_ldo_ranges[] = {
17	REGULATOR_LINEAR_RANGE(900000, 0, 14, 50000),
18	REGULATOR_LINEAR_RANGE(1700000, 15, 31, 100000),
19};
20
21static const struct regulator_ops wm8400_ldo_ops = {
22	.is_enabled = regulator_is_enabled_regmap,
23	.enable = regulator_enable_regmap,
24	.disable = regulator_disable_regmap,
25	.list_voltage = regulator_list_voltage_linear_range,
26	.get_voltage_sel = regulator_get_voltage_sel_regmap,
27	.set_voltage_sel = regulator_set_voltage_sel_regmap,
28	.map_voltage = regulator_map_voltage_linear_range,
29};
30
31static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev)
32{
33	struct regmap *rmap = rdev_get_regmap(dev);
34	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
35	u16 data[2];
36	int ret;
37
38	ret = regmap_bulk_read(rmap, WM8400_DCDC1_CONTROL_1 + offset, data, 2);
39	if (ret != 0)
40		return 0;
41
42	/* Datasheet: hibernate */
43	if (data[0] & WM8400_DC1_SLEEP)
44		return REGULATOR_MODE_STANDBY;
45
46	/* Datasheet: standby */
47	if (!(data[0] & WM8400_DC1_ACTIVE))
48		return REGULATOR_MODE_IDLE;
49
50	/* Datasheet: active with or without force PWM */
51	if (data[1] & WM8400_DC1_FRC_PWM)
52		return REGULATOR_MODE_FAST;
53	else
54		return REGULATOR_MODE_NORMAL;
55}
56
57static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode)
58{
59	struct regmap *rmap = rdev_get_regmap(dev);
60	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
61	int ret;
62
63	switch (mode) {
64	case REGULATOR_MODE_FAST:
65		/* Datasheet: active with force PWM */
66		ret = regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_2 + offset,
67				      WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM);
68		if (ret != 0)
69			return ret;
70
71		return regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_1 + offset,
72				       WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
73				       WM8400_DC1_ACTIVE);
74
75	case REGULATOR_MODE_NORMAL:
76		/* Datasheet: active */
77		ret = regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_2 + offset,
78				      WM8400_DC1_FRC_PWM, 0);
79		if (ret != 0)
80			return ret;
81
82		return regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_1 + offset,
83				       WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
84				       WM8400_DC1_ACTIVE);
85
86	case REGULATOR_MODE_IDLE:
87		/* Datasheet: standby */
88		return regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_1 + offset,
89				       WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, 0);
90	default:
91		return -EINVAL;
92	}
93}
94
95static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev,
96						 int input_uV, int output_uV,
97						 int load_uA)
98{
99	return REGULATOR_MODE_NORMAL;
100}
101
102static const struct regulator_ops wm8400_dcdc_ops = {
103	.is_enabled = regulator_is_enabled_regmap,
104	.enable = regulator_enable_regmap,
105	.disable = regulator_disable_regmap,
106	.list_voltage = regulator_list_voltage_linear,
107	.map_voltage = regulator_map_voltage_linear,
108	.get_voltage_sel = regulator_get_voltage_sel_regmap,
109	.set_voltage_sel = regulator_set_voltage_sel_regmap,
110	.get_mode = wm8400_dcdc_get_mode,
111	.set_mode = wm8400_dcdc_set_mode,
112	.get_optimum_mode = wm8400_dcdc_get_optimum_mode,
113};
114
115static struct regulator_desc regulators[] = {
116	{
117		.name = "LDO1",
118		.id = WM8400_LDO1,
119		.ops = &wm8400_ldo_ops,
120		.enable_reg = WM8400_LDO1_CONTROL,
121		.enable_mask = WM8400_LDO1_ENA,
122		.n_voltages = WM8400_LDO1_VSEL_MASK + 1,
123		.linear_ranges = wm8400_ldo_ranges,
124		.n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
125		.vsel_reg = WM8400_LDO1_CONTROL,
126		.vsel_mask = WM8400_LDO1_VSEL_MASK,
127		.type = REGULATOR_VOLTAGE,
128		.owner = THIS_MODULE,
129	},
130	{
131		.name = "LDO2",
132		.id = WM8400_LDO2,
133		.ops = &wm8400_ldo_ops,
134		.enable_reg = WM8400_LDO2_CONTROL,
135		.enable_mask = WM8400_LDO2_ENA,
136		.n_voltages = WM8400_LDO2_VSEL_MASK + 1,
137		.linear_ranges = wm8400_ldo_ranges,
138		.n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
139		.type = REGULATOR_VOLTAGE,
140		.vsel_reg = WM8400_LDO2_CONTROL,
141		.vsel_mask = WM8400_LDO2_VSEL_MASK,
142		.owner = THIS_MODULE,
143	},
144	{
145		.name = "LDO3",
146		.id = WM8400_LDO3,
147		.ops = &wm8400_ldo_ops,
148		.enable_reg = WM8400_LDO3_CONTROL,
149		.enable_mask = WM8400_LDO3_ENA,
150		.n_voltages = WM8400_LDO3_VSEL_MASK + 1,
151		.linear_ranges = wm8400_ldo_ranges,
152		.n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
153		.vsel_reg = WM8400_LDO3_CONTROL,
154		.vsel_mask = WM8400_LDO3_VSEL_MASK,
155		.type = REGULATOR_VOLTAGE,
156		.owner = THIS_MODULE,
157	},
158	{
159		.name = "LDO4",
160		.id = WM8400_LDO4,
161		.ops = &wm8400_ldo_ops,
162		.enable_reg = WM8400_LDO4_CONTROL,
163		.enable_mask = WM8400_LDO4_ENA,
164		.n_voltages = WM8400_LDO4_VSEL_MASK + 1,
165		.linear_ranges = wm8400_ldo_ranges,
166		.n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
167		.vsel_reg = WM8400_LDO4_CONTROL,
168		.vsel_mask = WM8400_LDO4_VSEL_MASK,
169		.type = REGULATOR_VOLTAGE,
170		.owner = THIS_MODULE,
171	},
172	{
173		.name = "DCDC1",
174		.id = WM8400_DCDC1,
175		.ops = &wm8400_dcdc_ops,
176		.enable_reg = WM8400_DCDC1_CONTROL_1,
177		.enable_mask = WM8400_DC1_ENA_MASK,
178		.n_voltages = WM8400_DC1_VSEL_MASK + 1,
179		.vsel_reg = WM8400_DCDC1_CONTROL_1,
180		.vsel_mask = WM8400_DC1_VSEL_MASK,
181		.min_uV = 850000,
182		.uV_step = 25000,
183		.type = REGULATOR_VOLTAGE,
184		.owner = THIS_MODULE,
185	},
186	{
187		.name = "DCDC2",
188		.id = WM8400_DCDC2,
189		.ops = &wm8400_dcdc_ops,
190		.enable_reg = WM8400_DCDC2_CONTROL_1,
191		.enable_mask = WM8400_DC2_ENA_MASK,
192		.n_voltages = WM8400_DC2_VSEL_MASK + 1,
193		.vsel_reg = WM8400_DCDC2_CONTROL_1,
194		.vsel_mask = WM8400_DC2_VSEL_MASK,
195		.min_uV = 850000,
196		.uV_step = 25000,
197		.type = REGULATOR_VOLTAGE,
198		.owner = THIS_MODULE,
199	},
200};
201
202static int wm8400_regulator_probe(struct platform_device *pdev)
203{
204	struct wm8400 *wm8400 = container_of(pdev, struct wm8400, regulators[pdev->id]);
205	struct regulator_config config = { };
206	struct regulator_dev *rdev;
207
208	config.dev = &pdev->dev;
209	config.init_data = dev_get_platdata(&pdev->dev);
210	config.driver_data = wm8400;
211	config.regmap = wm8400->regmap;
212
213	rdev = devm_regulator_register(&pdev->dev, &regulators[pdev->id],
214				       &config);
215	if (IS_ERR(rdev))
216		return PTR_ERR(rdev);
217
218	platform_set_drvdata(pdev, rdev);
219
220	return 0;
221}
222
223static struct platform_driver wm8400_regulator_driver = {
224	.driver = {
225		.name = "wm8400-regulator",
226		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
227	},
228	.probe = wm8400_regulator_probe,
229};
230
231/**
232 * wm8400_register_regulator - enable software control of a WM8400 regulator
233 *
234 * This function enables software control of a WM8400 regulator via
235 * the regulator API.  It is intended to be called from the
236 * platform_init() callback of the WM8400 MFD driver.
237 *
238 * @dev:      The WM8400 device to operate on.
239 * @reg:      The regulator to control.
240 * @initdata: Regulator initdata for the regulator.
241 */
242int wm8400_register_regulator(struct device *dev, int reg,
243			      struct regulator_init_data *initdata)
244{
245	struct wm8400 *wm8400 = dev_get_drvdata(dev);
246
247	if (wm8400->regulators[reg].name)
248		return -EBUSY;
249
250	initdata->driver_data = wm8400;
251
252	wm8400->regulators[reg].name = "wm8400-regulator";
253	wm8400->regulators[reg].id = reg;
254	wm8400->regulators[reg].dev.parent = dev;
255	wm8400->regulators[reg].dev.platform_data = initdata;
256
257	return platform_device_register(&wm8400->regulators[reg]);
258}
259EXPORT_SYMBOL_GPL(wm8400_register_regulator);
260
261static int __init wm8400_regulator_init(void)
262{
263	return platform_driver_register(&wm8400_regulator_driver);
264}
265subsys_initcall(wm8400_regulator_init);
266
267static void __exit wm8400_regulator_exit(void)
268{
269	platform_driver_unregister(&wm8400_regulator_driver);
270}
271module_exit(wm8400_regulator_exit);
272
273MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
274MODULE_DESCRIPTION("WM8400 regulator driver");
275MODULE_LICENSE("GPL");
276MODULE_ALIAS("platform:wm8400-regulator");
277