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362af736 AL |
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> | |
42fad570 MB |
8 | |
9 | #include <linux/bug.h> | |
10 | #include <linux/err.h> | |
11 | #include <linux/kernel.h> | |
65602c32 | 12 | #include <linux/module.h> |
42fad570 MB |
13 | #include <linux/regulator/driver.h> |
14 | #include <linux/mfd/wm8400-private.h> | |
15 | ||
60ab7f41 | 16 | static const struct linear_range wm8400_ldo_ranges[] = { |
8828bae4 AL |
17 | REGULATOR_LINEAR_RANGE(900000, 0, 14, 50000), |
18 | REGULATOR_LINEAR_RANGE(1700000, 15, 31, 100000), | |
6692e432 | 19 | }; |
42fad570 | 20 | |
b0d6dd3b | 21 | static const struct regulator_ops wm8400_ldo_ops = { |
c54a155d MB |
22 | .is_enabled = regulator_is_enabled_regmap, |
23 | .enable = regulator_enable_regmap, | |
24 | .disable = regulator_disable_regmap, | |
6692e432 | 25 | .list_voltage = regulator_list_voltage_linear_range, |
c54a155d MB |
26 | .get_voltage_sel = regulator_get_voltage_sel_regmap, |
27 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
6692e432 | 28 | .map_voltage = regulator_map_voltage_linear_range, |
42fad570 MB |
29 | }; |
30 | ||
42fad570 MB |
31 | static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev) |
32 | { | |
e08abeca | 33 | struct regmap *rmap = rdev_get_regmap(dev); |
42fad570 MB |
34 | int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; |
35 | u16 data[2]; | |
36 | int ret; | |
37 | ||
e08abeca | 38 | ret = regmap_bulk_read(rmap, WM8400_DCDC1_CONTROL_1 + offset, data, 2); |
42fad570 MB |
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 | { | |
e08abeca | 59 | struct regmap *rmap = rdev_get_regmap(dev); |
42fad570 MB |
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 */ | |
e08abeca | 66 | ret = regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_2 + offset, |
42fad570 MB |
67 | WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM); |
68 | if (ret != 0) | |
69 | return ret; | |
70 | ||
e08abeca | 71 | return regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_1 + offset, |
42fad570 MB |
72 | WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, |
73 | WM8400_DC1_ACTIVE); | |
74 | ||
75 | case REGULATOR_MODE_NORMAL: | |
76 | /* Datasheet: active */ | |
e08abeca | 77 | ret = regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_2 + offset, |
42fad570 MB |
78 | WM8400_DC1_FRC_PWM, 0); |
79 | if (ret != 0) | |
80 | return ret; | |
81 | ||
e08abeca | 82 | return regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_1 + offset, |
42fad570 MB |
83 | WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, |
84 | WM8400_DC1_ACTIVE); | |
85 | ||
86 | case REGULATOR_MODE_IDLE: | |
87 | /* Datasheet: standby */ | |
e08abeca | 88 | return regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_1 + offset, |
4001376e | 89 | WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, 0); |
42fad570 MB |
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 | ||
b0d6dd3b | 102 | static const struct regulator_ops wm8400_dcdc_ops = { |
c54a155d MB |
103 | .is_enabled = regulator_is_enabled_regmap, |
104 | .enable = regulator_enable_regmap, | |
105 | .disable = regulator_disable_regmap, | |
106 | .list_voltage = regulator_list_voltage_linear, | |
27eeabb7 | 107 | .map_voltage = regulator_map_voltage_linear, |
c54a155d MB |
108 | .get_voltage_sel = regulator_get_voltage_sel_regmap, |
109 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
42fad570 MB |
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, | |
c54a155d MB |
120 | .enable_reg = WM8400_LDO1_CONTROL, |
121 | .enable_mask = WM8400_LDO1_ENA, | |
216765d9 | 122 | .n_voltages = WM8400_LDO1_VSEL_MASK + 1, |
6692e432 MB |
123 | .linear_ranges = wm8400_ldo_ranges, |
124 | .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges), | |
c54a155d MB |
125 | .vsel_reg = WM8400_LDO1_CONTROL, |
126 | .vsel_mask = WM8400_LDO1_VSEL_MASK, | |
42fad570 MB |
127 | .type = REGULATOR_VOLTAGE, |
128 | .owner = THIS_MODULE, | |
129 | }, | |
130 | { | |
131 | .name = "LDO2", | |
132 | .id = WM8400_LDO2, | |
133 | .ops = &wm8400_ldo_ops, | |
c54a155d MB |
134 | .enable_reg = WM8400_LDO2_CONTROL, |
135 | .enable_mask = WM8400_LDO2_ENA, | |
216765d9 | 136 | .n_voltages = WM8400_LDO2_VSEL_MASK + 1, |
6692e432 MB |
137 | .linear_ranges = wm8400_ldo_ranges, |
138 | .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges), | |
42fad570 | 139 | .type = REGULATOR_VOLTAGE, |
c54a155d MB |
140 | .vsel_reg = WM8400_LDO2_CONTROL, |
141 | .vsel_mask = WM8400_LDO2_VSEL_MASK, | |
42fad570 MB |
142 | .owner = THIS_MODULE, |
143 | }, | |
144 | { | |
145 | .name = "LDO3", | |
146 | .id = WM8400_LDO3, | |
147 | .ops = &wm8400_ldo_ops, | |
c54a155d MB |
148 | .enable_reg = WM8400_LDO3_CONTROL, |
149 | .enable_mask = WM8400_LDO3_ENA, | |
216765d9 | 150 | .n_voltages = WM8400_LDO3_VSEL_MASK + 1, |
6692e432 MB |
151 | .linear_ranges = wm8400_ldo_ranges, |
152 | .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges), | |
c54a155d MB |
153 | .vsel_reg = WM8400_LDO3_CONTROL, |
154 | .vsel_mask = WM8400_LDO3_VSEL_MASK, | |
42fad570 MB |
155 | .type = REGULATOR_VOLTAGE, |
156 | .owner = THIS_MODULE, | |
157 | }, | |
158 | { | |
159 | .name = "LDO4", | |
160 | .id = WM8400_LDO4, | |
161 | .ops = &wm8400_ldo_ops, | |
c54a155d MB |
162 | .enable_reg = WM8400_LDO4_CONTROL, |
163 | .enable_mask = WM8400_LDO4_ENA, | |
216765d9 | 164 | .n_voltages = WM8400_LDO4_VSEL_MASK + 1, |
6692e432 MB |
165 | .linear_ranges = wm8400_ldo_ranges, |
166 | .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges), | |
c54a155d MB |
167 | .vsel_reg = WM8400_LDO4_CONTROL, |
168 | .vsel_mask = WM8400_LDO4_VSEL_MASK, | |
42fad570 MB |
169 | .type = REGULATOR_VOLTAGE, |
170 | .owner = THIS_MODULE, | |
171 | }, | |
172 | { | |
173 | .name = "DCDC1", | |
174 | .id = WM8400_DCDC1, | |
175 | .ops = &wm8400_dcdc_ops, | |
c54a155d MB |
176 | .enable_reg = WM8400_DCDC1_CONTROL_1, |
177 | .enable_mask = WM8400_DC1_ENA_MASK, | |
216765d9 | 178 | .n_voltages = WM8400_DC1_VSEL_MASK + 1, |
c54a155d MB |
179 | .vsel_reg = WM8400_DCDC1_CONTROL_1, |
180 | .vsel_mask = WM8400_DC1_VSEL_MASK, | |
181 | .min_uV = 850000, | |
182 | .uV_step = 25000, | |
42fad570 MB |
183 | .type = REGULATOR_VOLTAGE, |
184 | .owner = THIS_MODULE, | |
185 | }, | |
186 | { | |
187 | .name = "DCDC2", | |
188 | .id = WM8400_DCDC2, | |
189 | .ops = &wm8400_dcdc_ops, | |
c54a155d | 190 | .enable_reg = WM8400_DCDC2_CONTROL_1, |
178d08ea | 191 | .enable_mask = WM8400_DC2_ENA_MASK, |
216765d9 | 192 | .n_voltages = WM8400_DC2_VSEL_MASK + 1, |
c54a155d MB |
193 | .vsel_reg = WM8400_DCDC2_CONTROL_1, |
194 | .vsel_mask = WM8400_DC2_VSEL_MASK, | |
195 | .min_uV = 850000, | |
196 | .uV_step = 25000, | |
42fad570 MB |
197 | .type = REGULATOR_VOLTAGE, |
198 | .owner = THIS_MODULE, | |
199 | }, | |
200 | }; | |
201 | ||
a5023574 | 202 | static int wm8400_regulator_probe(struct platform_device *pdev) |
42fad570 | 203 | { |
1ad02bbc | 204 | struct wm8400 *wm8400 = container_of(pdev, struct wm8400, regulators[pdev->id]); |
c172708d | 205 | struct regulator_config config = { }; |
42fad570 MB |
206 | struct regulator_dev *rdev; |
207 | ||
c172708d | 208 | config.dev = &pdev->dev; |
dff91d0b | 209 | config.init_data = dev_get_platdata(&pdev->dev); |
c172708d | 210 | config.driver_data = wm8400; |
c54a155d | 211 | config.regmap = wm8400->regmap; |
42fad570 | 212 | |
eb8b3c83 MB |
213 | rdev = devm_regulator_register(&pdev->dev, ®ulators[pdev->id], |
214 | &config); | |
42fad570 MB |
215 | if (IS_ERR(rdev)) |
216 | return PTR_ERR(rdev); | |
217 | ||
1ad02bbc DT |
218 | platform_set_drvdata(pdev, rdev); |
219 | ||
42fad570 MB |
220 | return 0; |
221 | } | |
222 | ||
42fad570 MB |
223 | static struct platform_driver wm8400_regulator_driver = { |
224 | .driver = { | |
225 | .name = "wm8400-regulator", | |
226 | }, | |
227 | .probe = wm8400_regulator_probe, | |
42fad570 MB |
228 | }; |
229 | ||
230 | /** | |
231 | * wm8400_register_regulator - enable software control of a WM8400 regulator | |
232 | * | |
233 | * This function enables software control of a WM8400 regulator via | |
234 | * the regulator API. It is intended to be called from the | |
235 | * platform_init() callback of the WM8400 MFD driver. | |
236 | * | |
0c526166 LJ |
237 | * @dev: The WM8400 device to operate on. |
238 | * @reg: The regulator to control. | |
239 | * @initdata: Regulator initdata for the regulator. | |
42fad570 MB |
240 | */ |
241 | int wm8400_register_regulator(struct device *dev, int reg, | |
242 | struct regulator_init_data *initdata) | |
243 | { | |
1909e2f6 | 244 | struct wm8400 *wm8400 = dev_get_drvdata(dev); |
42fad570 MB |
245 | |
246 | if (wm8400->regulators[reg].name) | |
247 | return -EBUSY; | |
248 | ||
249 | initdata->driver_data = wm8400; | |
250 | ||
251 | wm8400->regulators[reg].name = "wm8400-regulator"; | |
252 | wm8400->regulators[reg].id = reg; | |
253 | wm8400->regulators[reg].dev.parent = dev; | |
42fad570 MB |
254 | wm8400->regulators[reg].dev.platform_data = initdata; |
255 | ||
256 | return platform_device_register(&wm8400->regulators[reg]); | |
257 | } | |
258 | EXPORT_SYMBOL_GPL(wm8400_register_regulator); | |
259 | ||
260 | static int __init wm8400_regulator_init(void) | |
261 | { | |
262 | return platform_driver_register(&wm8400_regulator_driver); | |
263 | } | |
5a1b22be | 264 | subsys_initcall(wm8400_regulator_init); |
42fad570 MB |
265 | |
266 | static void __exit wm8400_regulator_exit(void) | |
267 | { | |
268 | platform_driver_unregister(&wm8400_regulator_driver); | |
269 | } | |
270 | module_exit(wm8400_regulator_exit); | |
271 | ||
272 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
273 | MODULE_DESCRIPTION("WM8400 regulator driver"); | |
274 | MODULE_LICENSE("GPL"); | |
275 | MODULE_ALIAS("platform:wm8400-regulator"); |