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1/*
2 * consumer.h -- SoC Regulator consumer support.
3 *
4 * Copyright (C) 2007, 2008 Wolfson Microelectronics PLC.
5 *
6 * Author: Liam Girdwood <lg@opensource.wolfsonmicro.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 * Regulator Consumer Interface.
13 *
14 * A Power Management Regulator framework for SoC based devices.
15 * Features:-
16 * o Voltage and current level control.
17 * o Operating mode control.
18 * o Regulator status.
19 * o sysfs entries for showing client devices and status
20 *
21 * EXPERIMENTAL FEATURES:
22 * Dynamic Regulator operating Mode Switching (DRMS) - allows regulators
23 * to use most efficient operating mode depending upon voltage and load and
24 * is transparent to client drivers.
25 *
26 * e.g. Devices x,y,z share regulator r. Device x and y draw 20mA each during
27 * IO and 1mA at idle. Device z draws 100mA when under load and 5mA when
28 * idling. Regulator r has > 90% efficiency in NORMAL mode at loads > 100mA
29 * but this drops rapidly to 60% when below 100mA. Regulator r has > 90%
30 * efficiency in IDLE mode at loads < 10mA. Thus regulator r will operate
31 * in normal mode for loads > 10mA and in IDLE mode for load <= 10mA.
32 *
33 */
34
35#ifndef __LINUX_REGULATOR_CONSUMER_H_
36#define __LINUX_REGULATOR_CONSUMER_H_
37
38/*
39 * Regulator operating modes.
40 *
41 * Regulators can run in a variety of different operating modes depending on
42 * output load. This allows further system power savings by selecting the
43 * best (and most efficient) regulator mode for a desired load.
44 *
45 * Most drivers will only care about NORMAL. The modes below are generic and
46 * will probably not match the naming convention of your regulator data sheet
47 * but should match the use cases in the datasheet.
48 *
49 * In order of power efficiency (least efficient at top).
50 *
51 * Mode Description
52 * FAST Regulator can handle fast changes in it's load.
53 * e.g. useful in CPU voltage & frequency scaling where
54 * load can quickly increase with CPU frequency increases.
55 *
56 * NORMAL Normal regulator power supply mode. Most drivers will
57 * use this mode.
58 *
59 * IDLE Regulator runs in a more efficient mode for light
60 * loads. Can be used for devices that have a low power
61 * requirement during periods of inactivity. This mode
62 * may be more noisy than NORMAL and may not be able
63 * to handle fast load switching.
64 *
65 * STANDBY Regulator runs in the most efficient mode for very
66 * light loads. Can be used by devices when they are
67 * in a sleep/standby state. This mode is likely to be
68 * the most noisy and may not be able to handle fast load
69 * switching.
70 *
71 * NOTE: Most regulators will only support a subset of these modes. Some
72 * will only just support NORMAL.
73 *
74 * These modes can be OR'ed together to make up a mask of valid register modes.
75 */
76
77#define REGULATOR_MODE_FAST 0x1
78#define REGULATOR_MODE_NORMAL 0x2
79#define REGULATOR_MODE_IDLE 0x4
80#define REGULATOR_MODE_STANDBY 0x8
81
82/*
83 * Regulator notifier events.
84 *
85 * UNDER_VOLTAGE Regulator output is under voltage.
86 * OVER_CURRENT Regulator output current is too high.
87 * REGULATION_OUT Regulator output is out of regulation.
88 * FAIL Regulator output has failed.
89 * OVER_TEMP Regulator over temp.
90 * FORCE_DISABLE Regulator shut down by software.
91 *
92 * NOTE: These events can be OR'ed together when passed into handler.
93 */
94
95#define REGULATOR_EVENT_UNDER_VOLTAGE 0x01
96#define REGULATOR_EVENT_OVER_CURRENT 0x02
97#define REGULATOR_EVENT_REGULATION_OUT 0x04
98#define REGULATOR_EVENT_FAIL 0x08
99#define REGULATOR_EVENT_OVER_TEMP 0x10
100#define REGULATOR_EVENT_FORCE_DISABLE 0x20
101
102struct regulator;
103
104/**
105 * struct regulator_bulk_data - Data used for bulk regulator operations.
106 *
107 * @supply: The name of the supply. Initialised by the user before
108 * using the bulk regulator APIs.
109 * @consumer: The regulator consumer for the supply. This will be managed
110 * by the bulk API.
111 *
112 * The regulator APIs provide a series of regulator_bulk_() API calls as
113 * a convenience to consumers which require multiple supplies. This
114 * structure is used to manage data for these calls.
115 */
116struct regulator_bulk_data {
117 const char *supply;
118 struct regulator *consumer;
119};
120
121#if defined(CONFIG_REGULATOR)
122
123/* regulator get and put */
124struct regulator *__must_check regulator_get(struct device *dev,
125 const char *id);
126void regulator_put(struct regulator *regulator);
127
128/* regulator output control and status */
129int regulator_enable(struct regulator *regulator);
130int regulator_disable(struct regulator *regulator);
131int regulator_force_disable(struct regulator *regulator);
132int regulator_is_enabled(struct regulator *regulator);
133
134int regulator_bulk_get(struct device *dev, int num_consumers,
135 struct regulator_bulk_data *consumers);
136int regulator_bulk_enable(int num_consumers,
137 struct regulator_bulk_data *consumers);
138int regulator_bulk_disable(int num_consumers,
139 struct regulator_bulk_data *consumers);
140void regulator_bulk_free(int num_consumers,
141 struct regulator_bulk_data *consumers);
142
143int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV);
144int regulator_get_voltage(struct regulator *regulator);
145int regulator_set_current_limit(struct regulator *regulator,
146 int min_uA, int max_uA);
147int regulator_get_current_limit(struct regulator *regulator);
148
149int regulator_set_mode(struct regulator *regulator, unsigned int mode);
150unsigned int regulator_get_mode(struct regulator *regulator);
151int regulator_set_optimum_mode(struct regulator *regulator, int load_uA);
152
153/* regulator notifier block */
154int regulator_register_notifier(struct regulator *regulator,
155 struct notifier_block *nb);
156int regulator_unregister_notifier(struct regulator *regulator,
157 struct notifier_block *nb);
158
159/* driver data - core doesn't touch */
160void *regulator_get_drvdata(struct regulator *regulator);
161void regulator_set_drvdata(struct regulator *regulator, void *data);
162
163#else
164
165/*
166 * Make sure client drivers will still build on systems with no software
167 * controllable voltage or current regulators.
168 */
169static inline struct regulator *__must_check regulator_get(struct device *dev,
170 const char *id)
171{
172 /* Nothing except the stubbed out regulator API should be
173 * looking at the value except to check if it is an error
174 * value so the actual return value doesn't matter.
175 */
176 return (struct regulator *)id;
177}
178static inline void regulator_put(struct regulator *regulator)
179{
180}
181
182static inline int regulator_enable(struct regulator *regulator)
183{
184 return 0;
185}
186
187static inline int regulator_disable(struct regulator *regulator)
188{
189 return 0;
190}
191
192static inline int regulator_is_enabled(struct regulator *regulator)
193{
194 return 1;
195}
196
197static inline int regulator_bulk_get(struct device *dev,
198 int num_consumers,
199 struct regulator_bulk_data *consumers)
200{
201 return 0;
202}
203
204static inline int regulator_bulk_enable(int num_consumers,
205 struct regulator_bulk_data *consumers)
206{
207 return 0;
208}
209
210static inline int regulator_bulk_disable(int num_consumers,
211 struct regulator_bulk_data *consumers)
212{
213 return 0;
214}
215
216static inline void regulator_bulk_free(int num_consumers,
217 struct regulator_bulk_data *consumers)
218{
219}
220
221static inline int regulator_set_voltage(struct regulator *regulator,
222 int min_uV, int max_uV)
223{
224 return 0;
225}
226
227static inline int regulator_get_voltage(struct regulator *regulator)
228{
229 return 0;
230}
231
232static inline int regulator_set_current_limit(struct regulator *regulator,
233 int min_uA, int max_uA)
234{
235 return 0;
236}
237
238static inline int regulator_get_current_limit(struct regulator *regulator)
239{
240 return 0;
241}
242
243static inline int regulator_set_mode(struct regulator *regulator,
244 unsigned int mode)
245{
246 return 0;
247}
248
249static inline unsigned int regulator_get_mode(struct regulator *regulator)
250{
251 return REGULATOR_MODE_NORMAL;
252}
253
254static inline int regulator_set_optimum_mode(struct regulator *regulator,
255 int load_uA)
256{
257 return REGULATOR_MODE_NORMAL;
258}
259
260static inline int regulator_register_notifier(struct regulator *regulator,
261 struct notifier_block *nb)
262{
263 return 0;
264}
265
266static inline int regulator_unregister_notifier(struct regulator *regulator,
267 struct notifier_block *nb)
268{
269 return 0;
270}
271
272static inline void *regulator_get_drvdata(struct regulator *regulator)
273{
274 return NULL;
275}
276
277static inline void regulator_set_drvdata(struct regulator *regulator,
278 void *data)
279{
280}
281
282#endif
283
284#endif