summaryrefslogtreecommitdiffstats
path: root/include/linux/regulator/machine.h
blob: 3468703d663af6d94bbf6fd07343d8bd9418b81a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
/*
 * machine.h -- SoC Regulator support, machine/board driver API.
 *
 * Copyright (C) 2007, 2008 Wolfson Microelectronics PLC.
 *
 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Regulator Machine/Board Interface.
 */

#ifndef __LINUX_REGULATOR_MACHINE_H_
#define __LINUX_REGULATOR_MACHINE_H_

#include <linux/regulator/consumer.h>
#include <linux/suspend.h>

struct regulator;

/*
 * Regulator operation constraint flags. These flags are used to enable
 * certain regulator operations and can be OR'ed together.
 *
 * VOLTAGE:  Regulator output voltage can be changed by software on this
 *           board/machine.
 * CURRENT:  Regulator output current can be changed by software on this
 *           board/machine.
 * MODE:     Regulator operating mode can be changed by software on this
 *           board/machine.
 * STATUS:   Regulator can be enabled and disabled.
 * DRMS:     Dynamic Regulator Mode Switching is enabled for this regulator.
 * BYPASS:   Regulator can be put into bypass mode
 */

#define REGULATOR_CHANGE_VOLTAGE	0x1
#define REGULATOR_CHANGE_CURRENT	0x2
#define REGULATOR_CHANGE_MODE		0x4
#define REGULATOR_CHANGE_STATUS		0x8
#define REGULATOR_CHANGE_DRMS		0x10
#define REGULATOR_CHANGE_BYPASS		0x20

/*
 * operations in suspend mode
 * DO_NOTHING_IN_SUSPEND - the default value
 * DISABLE_IN_SUSPEND	- turn off regulator in suspend states
 * ENABLE_IN_SUSPEND	- keep regulator on in suspend states
 */
#define DO_NOTHING_IN_SUSPEND	(-1)
#define DISABLE_IN_SUSPEND	0
#define ENABLE_IN_SUSPEND	1

/* Regulator active discharge flags */
enum regulator_active_discharge {
	REGULATOR_ACTIVE_DISCHARGE_DEFAULT,
	REGULATOR_ACTIVE_DISCHARGE_DISABLE,
	REGULATOR_ACTIVE_DISCHARGE_ENABLE,
};

/**
 * struct regulator_state - regulator state during low power system states
 *
 * This describes a regulators state during a system wide low power
 * state.  One of enabled or disabled must be set for the
 * configuration to be applied.
 *
 * @uV: Default operating voltage during suspend, it can be adjusted
 *	among <min_uV, max_uV>.
 * @min_uV: Minimum suspend voltage may be set.
 * @max_uV: Maximum suspend voltage may be set.
 * @mode: Operating mode during suspend.
 * @enabled: operations during suspend.
 *	     - DO_NOTHING_IN_SUSPEND
 *	     - DISABLE_IN_SUSPEND
 *	     - ENABLE_IN_SUSPEND
 * @changeable: Is this state can be switched between enabled/disabled,
 */
struct regulator_state {
	int uV;
	int min_uV;
	int max_uV;
	unsigned int mode;
	int enabled;
	bool changeable;
};

/**
 * struct regulation_constraints - regulator operating constraints.
 *
 * This struct describes regulator and board/machine specific constraints.
 *
 * @name: Descriptive name for the constraints, used for display purposes.
 *
 * @min_uV: Smallest voltage consumers may set.
 * @max_uV: Largest voltage consumers may set.
 * @uV_offset: Offset applied to voltages from consumer to compensate for
 *             voltage drops.
 *
 * @min_uA: Smallest current consumers may set.
 * @max_uA: Largest current consumers may set.
 * @ilim_uA: Maximum input current.
 * @system_load: Load that isn't captured by any consumer requests.
 *
 * @max_spread: Max possible spread between coupled regulators
 * @valid_modes_mask: Mask of modes which may be configured by consumers.
 * @valid_ops_mask: Operations which may be performed by consumers.
 *
 * @always_on: Set if the regulator should never be disabled.
 * @boot_on: Set if the regulator is enabled when the system is initially
 *           started.  If the regulator is not enabled by the hardware or
 *           bootloader then it will be enabled when the constraints are
 *           applied.
 * @apply_uV: Apply the voltage constraint when initialising.
 * @ramp_disable: Disable ramp delay when initialising or when setting voltage.
 * @soft_start: Enable soft start so that voltage ramps slowly.
 * @pull_down: Enable pull down when regulator is disabled.
 * @over_current_protection: Auto disable on over current event.
 *
 * @input_uV: Input voltage for regulator when supplied by another regulator.
 *
 * @state_disk: State for regulator when system is suspended in disk mode.
 * @state_mem: State for regulator when system is suspended in mem mode.
 * @state_standby: State for regulator when system is suspended in standby
 *                 mode.
 * @initial_state: Suspend state to set by default.
 * @initial_mode: Mode to set at startup.
 * @ramp_delay: Time to settle down after voltage change (unit: uV/us)
 * @settling_time: Time to settle down after voltage change when voltage
 *		   change is non-linear (unit: microseconds).
 * @settling_time_up: Time to settle down after voltage increase when voltage
 *		      change is non-linear (unit: microseconds).
 * @settling_time_down : Time to settle down after voltage decrease when
 *			 voltage change is non-linear (unit: microseconds).
 * @active_discharge: Enable/disable active discharge. The enum
 *		      regulator_active_discharge values are used for
 *		      initialisation.
 * @enable_time: Turn-on time of the rails (unit: microseconds)
 */
struct regulation_constraints {

	const char *name;

	/* voltage output range (inclusive) - for voltage control */
	int min_uV;
	int max_uV;

	int uV_offset;

	/* current output range (inclusive) - for current control */
	int min_uA;
	int max_uA;
	int ilim_uA;

	int system_load;

	/* used for coupled regulators */
	int max_spread;

	/* valid regulator operating modes for this machine */
	unsigned int valid_modes_mask;

	/* valid operations for regulator on this machine */
	unsigned int valid_ops_mask;

	/* regulator input voltage - only if supply is another regulator */
	int input_uV;

	/* regulator suspend states for global PMIC STANDBY/HIBERNATE */
	struct regulator_state state_disk;
	struct regulator_state state_mem;
	struct regulator_state state_standby;
	suspend_state_t initial_state; /* suspend state to set at init */

	/* mode to set on startup */
	unsigned int initial_mode;

	unsigned int ramp_delay;
	unsigned int settling_time;
	unsigned int settling_time_up;
	unsigned int settling_time_down;
	unsigned int enable_time;

	unsigned int active_discharge;

	/* constraint flags */
	unsigned always_on:1;	/* regulator never off when system is on */
	unsigned boot_on:1;	/* bootloader/firmware enabled regulator */
	unsigned apply_uV:1;	/* apply uV constraint if min == max */
	unsigned ramp_disable:1; /* disable ramp delay */
	unsigned soft_start:1;	/* ramp voltage slowly */
	unsigned pull_down:1;	/* pull down resistor when regulator off */
	unsigned over_current_protection:1; /* auto disable on over current */
};

/**
 * struct regulator_consumer_supply - supply -> device mapping
 *
 * This maps a supply name to a device. Use of dev_name allows support for
 * buses which make struct device available late such as I2C.
 *
 * @dev_name: Result of dev_name() for the consumer.
 * @supply: Name for the supply.
 */
struct regulator_consumer_supply {
	const char *dev_name;   /* dev_name() for consumer */
	const char *supply;	/* consumer supply - e.g. "vcc" */
};

/* Initialize struct regulator_consumer_supply */
#define REGULATOR_SUPPLY(_name, _dev_name)			\
{								\
	.supply		= _name,				\
	.dev_name	= _dev_name,				\
}

/**
 * struct regulator_init_data - regulator platform initialisation data.
 *
 * Initialisation constraints, our supply and consumers supplies.
 *
 * @supply_regulator: Parent regulator.  Specified using the regulator name
 *                    as it appears in the name field in sysfs, which can
 *                    be explicitly set using the constraints field 'name'.
 *
 * @constraints: Constraints.  These must be specified for the regulator to
 *               be usable.
 * @num_consumer_supplies: Number of consumer device supplies.
 * @consumer_supplies: Consumer device supply configuration.
 *
 * @regulator_init: Callback invoked when the regulator has been registered.
 * @driver_data: Data passed to regulator_init.
 */
struct regulator_init_data {
	const char *supply_regulator;        /* or NULL for system supply */

	struct regulation_constraints constraints;

	int num_consumer_supplies;
	struct regulator_consumer_supply *consumer_supplies;

	/* optional regulator machine specific init */
	int (*regulator_init)(void *driver_data);
	void *driver_data;	/* core does not touch this */
};

#ifdef CONFIG_REGULATOR
void regulator_has_full_constraints(void);
#else
static inline void regulator_has_full_constraints(void)
{
}
#endif

static inline int regulator_suspend_prepare(suspend_state_t state)
{
	return 0;
}
static inline int regulator_suspend_finish(void)
{
	return 0;
}

#endif