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
wm8400_dcdc_get_mode(struct regulator_dev * dev)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
wm8400_dcdc_set_mode(struct regulator_dev * dev,unsigned int mode)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
wm8400_dcdc_get_optimum_mode(struct regulator_dev * dev,int input_uV,int output_uV,int load_uA)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 const 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
wm8400_regulator_probe(struct platform_device * pdev)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, ®ulators[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 */
wm8400_register_regulator(struct device * dev,int reg,struct regulator_init_data * initdata)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
wm8400_regulator_init(void)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
wm8400_regulator_exit(void)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