include/linux/regulator/machine.h

   1 /*
   2  * machine.h -- SoC Regulator support, machine/board driver API.
   3  *
   4  * Copyright (C) 2007, 2008 Wolfson Microelectronics PLC.
   5  *
   6  * Author: Liam Girdwood <lrg@slimlogic.co.uk>
   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 Machine/Board Interface.
  13  */
  14
  15 #ifndef __LINUX_REGULATOR_MACHINE_H_
  16 #define __LINUX_REGULATOR_MACHINE_H_
  17
  18 #include <linux/regulator/consumer.h>
  19 #include <linux/suspend.h>
  20
  21 struct regulator;
  22
  23 /*
  24  * Regulator operation constraint flags. These flags are used to enable
  25  * certain regulator operations and can be OR'ed together.
  26  *
  27  * VOLTAGE:  Regulator output voltage can be changed by software on this
  28  *           board/machine.
  29  * CURRENT:  Regulator output current can be changed by software on this
  30  *           board/machine.
  31  * MODE:     Regulator operating mode can be changed by software on this
  32  *           board/machine.
  33  * STATUS:   Regulator can be enabled and disabled.
  34  * DRMS:     Dynamic Regulator Mode Switching is enabled for this regulator.
  35  * BYPASS:   Regulator can be put into bypass mode
  36  */
  37
  38 #define REGULATOR_CHANGE_VOLTAGE        0x1
  39 #define REGULATOR_CHANGE_CURRENT        0x2
  40 #define REGULATOR_CHANGE_MODE           0x4
  41 #define REGULATOR_CHANGE_STATUS         0x8
  42 #define REGULATOR_CHANGE_DRMS           0x10
  43 #define REGULATOR_CHANGE_BYPASS         0x20
  44
  45 /* Regulator active discharge flags */
  46 enum regulator_active_discharge {
  47         REGULATOR_ACTIVE_DISCHARGE_DEFAULT,
  48         REGULATOR_ACTIVE_DISCHARGE_DISABLE,
  49         REGULATOR_ACTIVE_DISCHARGE_ENABLE,
  50 };
  51
  52 /**
  53  * struct regulator_state - regulator state during low power system states
  54  *
  55  * This describes a regulators state during a system wide low power
  56  * state.  One of enabled or disabled must be set for the
  57  * configuration to be applied.
  58  *
  59  * @uV: Operating voltage during suspend.
  60  * @mode: Operating mode during suspend.
  61  * @enabled: Enabled during suspend.
  62  * @disabled: Disabled during suspend.
  63  */
  64 struct regulator_state {
  65         int uV; /* suspend voltage */
  66         unsigned int mode; /* suspend regulator operating mode */
  67         int enabled; /* is regulator enabled in this suspend state */
  68         int disabled; /* is the regulator disabled in this suspend state */
  69 };
  70
  71 /**
  72  * struct regulation_constraints - regulator operating constraints.
  73  *
  74  * This struct describes regulator and board/machine specific constraints.
  75  *
  76  * @name: Descriptive name for the constraints, used for display purposes.
  77  *
  78  * @min_uV: Smallest voltage consumers may set.
  79  * @max_uV: Largest voltage consumers may set.
  80  * @uV_offset: Offset applied to voltages from consumer to compensate for
  81  *             voltage drops.
  82  *
  83  * @min_uA: Smallest current consumers may set.
  84  * @max_uA: Largest current consumers may set.
  85  * @ilim_uA: Maximum input current.
  86  * @system_load: Load that isn't captured by any consumer requests.
  87  *
  88  * @valid_modes_mask: Mask of modes which may be configured by consumers.
  89  * @valid_ops_mask: Operations which may be performed by consumers.
  90  *
  91  * @always_on: Set if the regulator should never be disabled.
  92  * @boot_on: Set if the regulator is enabled when the system is initially
  93  *           started.  If the regulator is not enabled by the hardware or
  94  *           bootloader then it will be enabled when the constraints are
  95  *           applied.
  96  * @apply_uV: Apply the voltage constraint when initialising.
  97  * @ramp_disable: Disable ramp delay when initialising or when setting voltage.
  98  * @soft_start: Enable soft start so that voltage ramps slowly.
  99  * @pull_down: Enable pull down when regulator is disabled.
 100  * @over_current_protection: Auto disable on over current event.
 101  *
 102  * @input_uV: Input voltage for regulator when supplied by another regulator.
 103  *
 104  * @state_disk: State for regulator when system is suspended in disk mode.
 105  * @state_mem: State for regulator when system is suspended in mem mode.
 106  * @state_standby: State for regulator when system is suspended in standby
 107  *                 mode.
 108  * @initial_state: Suspend state to set by default.
 109  * @initial_mode: Mode to set at startup.
 110  * @ramp_delay: Time to settle down after voltage change (unit: uV/us)
 111  * @settling_time: Time to settle down after voltage change when voltage
 112  *                 change is non-linear (unit: microseconds).
 113  * @active_discharge: Enable/disable active discharge. The enum
 114  *                    regulator_active_discharge values are used for
 115  *                    initialisation.
 116  * @enable_time: Turn-on time of the rails (unit: microseconds)
 117  */
 118 struct regulation_constraints {
 119
 120         const char *name;
 121
 122         /* voltage output range (inclusive) - for voltage control */
 123         int min_uV;
 124         int max_uV;
 125
 126         int uV_offset;
 127
 128         /* current output range (inclusive) - for current control */
 129         int min_uA;
 130         int max_uA;
 131         int ilim_uA;
 132
 133         int system_load;
 134
 135         /* valid regulator operating modes for this machine */
 136         unsigned int valid_modes_mask;
 137
 138         /* valid operations for regulator on this machine */
 139         unsigned int valid_ops_mask;
 140
 141         /* regulator input voltage - only if supply is another regulator */
 142         int input_uV;
 143
 144         /* regulator suspend states for global PMIC STANDBY/HIBERNATE */
 145         struct regulator_state state_disk;
 146         struct regulator_state state_mem;
 147         struct regulator_state state_standby;
 148         suspend_state_t initial_state; /* suspend state to set at init */
 149
 150         /* mode to set on startup */
 151         unsigned int initial_mode;
 152
 153         unsigned int ramp_delay;
 154         unsigned int settling_time;
 155         unsigned int enable_time;
 156
 157         unsigned int active_discharge;
 158
 159         /* constraint flags */
 160         unsigned always_on:1;   /* regulator never off when system is on */
 161         unsigned boot_on:1;     /* bootloader/firmware enabled regulator */
 162         unsigned apply_uV:1;    /* apply uV constraint if min == max */
 163         unsigned ramp_disable:1; /* disable ramp delay */
 164         unsigned soft_start:1;  /* ramp voltage slowly */
 165         unsigned pull_down:1;   /* pull down resistor when regulator off */
 166         unsigned over_current_protection:1; /* auto disable on over current */
 167 };
 168
 169 /**
 170  * struct regulator_consumer_supply - supply -> device mapping
 171  *
 172  * This maps a supply name to a device. Use of dev_name allows support for
 173  * buses which make struct device available late such as I2C.
 174  *
 175  * @dev_name: Result of dev_name() for the consumer.
 176  * @supply: Name for the supply.
 177  */
 178 struct regulator_consumer_supply {
 179         const char *dev_name;   /* dev_name() for consumer */
 180         const char *supply;     /* consumer supply - e.g. "vcc" */
 181 };
 182
 183 /* Initialize struct regulator_consumer_supply */
 184 #define REGULATOR_SUPPLY(_name, _dev_name)                      \
 185 {                                                               \
 186         .supply         = _name,                                \
 187         .dev_name       = _dev_name,                            \
 188 }
 189
 190 /**
 191  * struct regulator_init_data - regulator platform initialisation data.
 192  *
 193  * Initialisation constraints, our supply and consumers supplies.
 194  *
 195  * @supply_regulator: Parent regulator.  Specified using the regulator name
 196  *                    as it appears in the name field in sysfs, which can
 197  *                    be explicitly set using the constraints field 'name'.
 198  *
 199  * @constraints: Constraints.  These must be specified for the regulator to
 200  *               be usable.
 201  * @num_consumer_supplies: Number of consumer device supplies.
 202  * @consumer_supplies: Consumer device supply configuration.
 203  *
 204  * @regulator_init: Callback invoked when the regulator has been registered.
 205  * @driver_data: Data passed to regulator_init.
 206  */
 207 struct regulator_init_data {
 208         const char *supply_regulator;        /* or NULL for system supply */
 209
 210         struct regulation_constraints constraints;
 211
 212         int num_consumer_supplies;
 213         struct regulator_consumer_supply *consumer_supplies;
 214
 215         /* optional regulator machine specific init */
 216         int (*regulator_init)(void *driver_data);
 217         void *driver_data;      /* core does not touch this */
 218 };
 219
 220 #ifdef CONFIG_REGULATOR
 221 void regulator_has_full_constraints(void);
 222 int regulator_suspend_prepare(suspend_state_t state);
 223 int regulator_suspend_finish(void);
 224 #else
 225 static inline void regulator_has_full_constraints(void)
 226 {
 227 }
 228 static inline int regulator_suspend_prepare(suspend_state_t state)
 229 {
 230         return 0;
 231 }
 232 static inline int regulator_suspend_finish(void)
 233 {
 234         return 0;
 235 }
 236 #endif
 237
 238 #endif