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42fad570 MB |
1 | /* |
2 | * Regulator support for WM8400 | |
3 | * | |
4 | * Copyright 2008 Wolfson Microelectronics PLC. | |
5 | * | |
6 | * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License as | |
10 | * published by the Free Software Foundation; either version 2 of the | |
11 | * License, or (at your option) any later version. | |
12 | * | |
13 | */ | |
14 | ||
15 | #include <linux/bug.h> | |
16 | #include <linux/err.h> | |
17 | #include <linux/kernel.h> | |
65602c32 | 18 | #include <linux/module.h> |
42fad570 MB |
19 | #include <linux/regulator/driver.h> |
20 | #include <linux/mfd/wm8400-private.h> | |
21 | ||
6692e432 MB |
22 | static const struct regulator_linear_range wm8400_ldo_ranges[] = { |
23 | { .min_uV = 900000, .max_uV = 1600000, .min_sel = 0, .max_sel = 14, | |
24 | .uV_step = 50000 }, | |
25 | { .min_uV = 1700000, .max_uV = 3300000, .min_sel = 15, .max_sel = 31, | |
26 | .uV_step = 100000 }, | |
27 | }; | |
42fad570 MB |
28 | |
29 | static struct regulator_ops wm8400_ldo_ops = { | |
c54a155d MB |
30 | .is_enabled = regulator_is_enabled_regmap, |
31 | .enable = regulator_enable_regmap, | |
32 | .disable = regulator_disable_regmap, | |
6692e432 | 33 | .list_voltage = regulator_list_voltage_linear_range, |
c54a155d MB |
34 | .get_voltage_sel = regulator_get_voltage_sel_regmap, |
35 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
6692e432 | 36 | .map_voltage = regulator_map_voltage_linear_range, |
42fad570 MB |
37 | }; |
38 | ||
42fad570 MB |
39 | static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev) |
40 | { | |
41 | struct wm8400 *wm8400 = rdev_get_drvdata(dev); | |
42 | int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; | |
43 | u16 data[2]; | |
44 | int ret; | |
45 | ||
46 | ret = wm8400_block_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 2, | |
47 | data); | |
48 | if (ret != 0) | |
49 | return 0; | |
50 | ||
51 | /* Datasheet: hibernate */ | |
52 | if (data[0] & WM8400_DC1_SLEEP) | |
53 | return REGULATOR_MODE_STANDBY; | |
54 | ||
55 | /* Datasheet: standby */ | |
56 | if (!(data[0] & WM8400_DC1_ACTIVE)) | |
57 | return REGULATOR_MODE_IDLE; | |
58 | ||
59 | /* Datasheet: active with or without force PWM */ | |
60 | if (data[1] & WM8400_DC1_FRC_PWM) | |
61 | return REGULATOR_MODE_FAST; | |
62 | else | |
63 | return REGULATOR_MODE_NORMAL; | |
64 | } | |
65 | ||
66 | static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode) | |
67 | { | |
68 | struct wm8400 *wm8400 = rdev_get_drvdata(dev); | |
69 | int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; | |
70 | int ret; | |
71 | ||
72 | switch (mode) { | |
73 | case REGULATOR_MODE_FAST: | |
74 | /* Datasheet: active with force PWM */ | |
75 | ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset, | |
76 | WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM); | |
77 | if (ret != 0) | |
78 | return ret; | |
79 | ||
80 | return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, | |
81 | WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, | |
82 | WM8400_DC1_ACTIVE); | |
83 | ||
84 | case REGULATOR_MODE_NORMAL: | |
85 | /* Datasheet: active */ | |
86 | ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset, | |
87 | WM8400_DC1_FRC_PWM, 0); | |
88 | if (ret != 0) | |
89 | return ret; | |
90 | ||
91 | return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, | |
92 | WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, | |
93 | WM8400_DC1_ACTIVE); | |
94 | ||
95 | case REGULATOR_MODE_IDLE: | |
96 | /* Datasheet: standby */ | |
42fad570 | 97 | return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, |
4001376e | 98 | WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, 0); |
42fad570 MB |
99 | default: |
100 | return -EINVAL; | |
101 | } | |
102 | } | |
103 | ||
104 | static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev, | |
105 | int input_uV, int output_uV, | |
106 | int load_uA) | |
107 | { | |
108 | return REGULATOR_MODE_NORMAL; | |
109 | } | |
110 | ||
111 | static struct regulator_ops wm8400_dcdc_ops = { | |
c54a155d MB |
112 | .is_enabled = regulator_is_enabled_regmap, |
113 | .enable = regulator_enable_regmap, | |
114 | .disable = regulator_disable_regmap, | |
115 | .list_voltage = regulator_list_voltage_linear, | |
27eeabb7 | 116 | .map_voltage = regulator_map_voltage_linear, |
c54a155d MB |
117 | .get_voltage_sel = regulator_get_voltage_sel_regmap, |
118 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
42fad570 MB |
119 | .get_mode = wm8400_dcdc_get_mode, |
120 | .set_mode = wm8400_dcdc_set_mode, | |
121 | .get_optimum_mode = wm8400_dcdc_get_optimum_mode, | |
122 | }; | |
123 | ||
124 | static struct regulator_desc regulators[] = { | |
125 | { | |
126 | .name = "LDO1", | |
127 | .id = WM8400_LDO1, | |
128 | .ops = &wm8400_ldo_ops, | |
c54a155d MB |
129 | .enable_reg = WM8400_LDO1_CONTROL, |
130 | .enable_mask = WM8400_LDO1_ENA, | |
216765d9 | 131 | .n_voltages = WM8400_LDO1_VSEL_MASK + 1, |
6692e432 MB |
132 | .linear_ranges = wm8400_ldo_ranges, |
133 | .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges), | |
c54a155d MB |
134 | .vsel_reg = WM8400_LDO1_CONTROL, |
135 | .vsel_mask = WM8400_LDO1_VSEL_MASK, | |
42fad570 MB |
136 | .type = REGULATOR_VOLTAGE, |
137 | .owner = THIS_MODULE, | |
138 | }, | |
139 | { | |
140 | .name = "LDO2", | |
141 | .id = WM8400_LDO2, | |
142 | .ops = &wm8400_ldo_ops, | |
c54a155d MB |
143 | .enable_reg = WM8400_LDO2_CONTROL, |
144 | .enable_mask = WM8400_LDO2_ENA, | |
216765d9 | 145 | .n_voltages = WM8400_LDO2_VSEL_MASK + 1, |
6692e432 MB |
146 | .linear_ranges = wm8400_ldo_ranges, |
147 | .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges), | |
42fad570 | 148 | .type = REGULATOR_VOLTAGE, |
c54a155d MB |
149 | .vsel_reg = WM8400_LDO2_CONTROL, |
150 | .vsel_mask = WM8400_LDO2_VSEL_MASK, | |
42fad570 MB |
151 | .owner = THIS_MODULE, |
152 | }, | |
153 | { | |
154 | .name = "LDO3", | |
155 | .id = WM8400_LDO3, | |
156 | .ops = &wm8400_ldo_ops, | |
c54a155d MB |
157 | .enable_reg = WM8400_LDO3_CONTROL, |
158 | .enable_mask = WM8400_LDO3_ENA, | |
216765d9 | 159 | .n_voltages = WM8400_LDO3_VSEL_MASK + 1, |
6692e432 MB |
160 | .linear_ranges = wm8400_ldo_ranges, |
161 | .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges), | |
c54a155d MB |
162 | .vsel_reg = WM8400_LDO3_CONTROL, |
163 | .vsel_mask = WM8400_LDO3_VSEL_MASK, | |
42fad570 MB |
164 | .type = REGULATOR_VOLTAGE, |
165 | .owner = THIS_MODULE, | |
166 | }, | |
167 | { | |
168 | .name = "LDO4", | |
169 | .id = WM8400_LDO4, | |
170 | .ops = &wm8400_ldo_ops, | |
c54a155d MB |
171 | .enable_reg = WM8400_LDO4_CONTROL, |
172 | .enable_mask = WM8400_LDO4_ENA, | |
216765d9 | 173 | .n_voltages = WM8400_LDO4_VSEL_MASK + 1, |
6692e432 MB |
174 | .linear_ranges = wm8400_ldo_ranges, |
175 | .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges), | |
c54a155d MB |
176 | .vsel_reg = WM8400_LDO4_CONTROL, |
177 | .vsel_mask = WM8400_LDO4_VSEL_MASK, | |
42fad570 MB |
178 | .type = REGULATOR_VOLTAGE, |
179 | .owner = THIS_MODULE, | |
180 | }, | |
181 | { | |
182 | .name = "DCDC1", | |
183 | .id = WM8400_DCDC1, | |
184 | .ops = &wm8400_dcdc_ops, | |
c54a155d MB |
185 | .enable_reg = WM8400_DCDC1_CONTROL_1, |
186 | .enable_mask = WM8400_DC1_ENA_MASK, | |
216765d9 | 187 | .n_voltages = WM8400_DC1_VSEL_MASK + 1, |
c54a155d MB |
188 | .vsel_reg = WM8400_DCDC1_CONTROL_1, |
189 | .vsel_mask = WM8400_DC1_VSEL_MASK, | |
190 | .min_uV = 850000, | |
191 | .uV_step = 25000, | |
42fad570 MB |
192 | .type = REGULATOR_VOLTAGE, |
193 | .owner = THIS_MODULE, | |
194 | }, | |
195 | { | |
196 | .name = "DCDC2", | |
197 | .id = WM8400_DCDC2, | |
198 | .ops = &wm8400_dcdc_ops, | |
c54a155d MB |
199 | .enable_reg = WM8400_DCDC2_CONTROL_1, |
200 | .enable_mask = WM8400_DC1_ENA_MASK, | |
216765d9 | 201 | .n_voltages = WM8400_DC2_VSEL_MASK + 1, |
c54a155d MB |
202 | .vsel_reg = WM8400_DCDC2_CONTROL_1, |
203 | .vsel_mask = WM8400_DC2_VSEL_MASK, | |
204 | .min_uV = 850000, | |
205 | .uV_step = 25000, | |
42fad570 MB |
206 | .type = REGULATOR_VOLTAGE, |
207 | .owner = THIS_MODULE, | |
208 | }, | |
209 | }; | |
210 | ||
a5023574 | 211 | static int wm8400_regulator_probe(struct platform_device *pdev) |
42fad570 | 212 | { |
1ad02bbc | 213 | struct wm8400 *wm8400 = container_of(pdev, struct wm8400, regulators[pdev->id]); |
c172708d | 214 | struct regulator_config config = { }; |
42fad570 MB |
215 | struct regulator_dev *rdev; |
216 | ||
c172708d MB |
217 | config.dev = &pdev->dev; |
218 | config.init_data = pdev->dev.platform_data; | |
219 | config.driver_data = wm8400; | |
c54a155d | 220 | config.regmap = wm8400->regmap; |
42fad570 | 221 | |
c172708d | 222 | rdev = regulator_register(®ulators[pdev->id], &config); |
42fad570 MB |
223 | if (IS_ERR(rdev)) |
224 | return PTR_ERR(rdev); | |
225 | ||
1ad02bbc DT |
226 | platform_set_drvdata(pdev, rdev); |
227 | ||
42fad570 MB |
228 | return 0; |
229 | } | |
230 | ||
8dc995f5 | 231 | static int wm8400_regulator_remove(struct platform_device *pdev) |
42fad570 MB |
232 | { |
233 | struct regulator_dev *rdev = platform_get_drvdata(pdev); | |
234 | ||
235 | regulator_unregister(rdev); | |
236 | ||
237 | return 0; | |
238 | } | |
239 | ||
240 | static struct platform_driver wm8400_regulator_driver = { | |
241 | .driver = { | |
242 | .name = "wm8400-regulator", | |
243 | }, | |
244 | .probe = wm8400_regulator_probe, | |
5eb9f2b9 | 245 | .remove = wm8400_regulator_remove, |
42fad570 MB |
246 | }; |
247 | ||
248 | /** | |
249 | * wm8400_register_regulator - enable software control of a WM8400 regulator | |
250 | * | |
251 | * This function enables software control of a WM8400 regulator via | |
252 | * the regulator API. It is intended to be called from the | |
253 | * platform_init() callback of the WM8400 MFD driver. | |
254 | * | |
255 | * @param dev The WM8400 device to operate on. | |
256 | * @param reg The regulator to control. | |
257 | * @param initdata Regulator initdata for the regulator. | |
258 | */ | |
259 | int wm8400_register_regulator(struct device *dev, int reg, | |
260 | struct regulator_init_data *initdata) | |
261 | { | |
1909e2f6 | 262 | struct wm8400 *wm8400 = dev_get_drvdata(dev); |
42fad570 MB |
263 | |
264 | if (wm8400->regulators[reg].name) | |
265 | return -EBUSY; | |
266 | ||
267 | initdata->driver_data = wm8400; | |
268 | ||
269 | wm8400->regulators[reg].name = "wm8400-regulator"; | |
270 | wm8400->regulators[reg].id = reg; | |
271 | wm8400->regulators[reg].dev.parent = dev; | |
42fad570 MB |
272 | wm8400->regulators[reg].dev.platform_data = initdata; |
273 | ||
274 | return platform_device_register(&wm8400->regulators[reg]); | |
275 | } | |
276 | EXPORT_SYMBOL_GPL(wm8400_register_regulator); | |
277 | ||
278 | static int __init wm8400_regulator_init(void) | |
279 | { | |
280 | return platform_driver_register(&wm8400_regulator_driver); | |
281 | } | |
5a1b22be | 282 | subsys_initcall(wm8400_regulator_init); |
42fad570 MB |
283 | |
284 | static void __exit wm8400_regulator_exit(void) | |
285 | { | |
286 | platform_driver_unregister(&wm8400_regulator_driver); | |
287 | } | |
288 | module_exit(wm8400_regulator_exit); | |
289 | ||
290 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
291 | MODULE_DESCRIPTION("WM8400 regulator driver"); | |
292 | MODULE_LICENSE("GPL"); | |
293 | MODULE_ALIAS("platform:wm8400-regulator"); |