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