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 
16 static 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 
21 static 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 
31 static 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 
57 static 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 
95 static 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 
102 static 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 
115 static 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 
202 static 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 
223 static 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  */
242 int 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 }
259 EXPORT_SYMBOL_GPL(wm8400_register_regulator);
260 
261 static int __init wm8400_regulator_init(void)
262 {
263 	return platform_driver_register(&wm8400_regulator_driver);
264 }
265 subsys_initcall(wm8400_regulator_init);
266 
267 static void __exit wm8400_regulator_exit(void)
268 {
269 	platform_driver_unregister(&wm8400_regulator_driver);
270 }
271 module_exit(wm8400_regulator_exit);
272 
273 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
274 MODULE_DESCRIPTION("WM8400 regulator driver");
275 MODULE_LICENSE("GPL");
276 MODULE_ALIAS("platform:wm8400-regulator");
277