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 /*
  46  * operations in suspend mode
  47  * DO_NOTHING_IN_SUSPEND - the default value
  48  * DISABLE_IN_SUSPEND   - turn off regulator in suspend states
  49  * ENABLE_IN_SUSPEND    - keep regulator on in suspend states
  50  */
  51 #define DO_NOTHING_IN_SUSPEND   (-1)
  52 #define DISABLE_IN_SUSPEND      0
  53 #define ENABLE_IN_SUSPEND       1
  54
  55 /* Regulator active discharge flags */
  56 enum regulator_active_discharge {
  57         REGULATOR_ACTIVE_DISCHARGE_DEFAULT,
  58         REGULATOR_ACTIVE_DISCHARGE_DISABLE,
  59         REGULATOR_ACTIVE_DISCHARGE_ENABLE,
  60 };
  61
  62 /**
  63  * struct regulator_state - regulator state during low power system states
  64  *
  65  * This describes a regulators state during a system wide low power
  66  * state.  One of enabled or disabled must be set for the
  67  * configuration to be applied.
  68  *
  69  * @uV: Default operating voltage during suspend, it can be adjusted
  70  *      among <min_uV, max_uV>.
  71  * @min_uV: Minimum suspend voltage may be set.
  72  * @max_uV: Maximum suspend voltage may be set.
  73  * @mode: Operating mode during suspend.
  74  * @enabled: operations during suspend.
  75  *           - DO_NOTHING_IN_SUSPEND
  76  *           - DISABLE_IN_SUSPEND
  77  *           - ENABLE_IN_SUSPEND
  78  * @changeable: Is this state can be switched between enabled/disabled,
  79  */
  80 struct regulator_state {
  81         int uV;
  82         int min_uV;
  83         int max_uV;
  84         unsigned int mode;
  85         int enabled;
  86         bool changeable;
  87 };
  88
  89 /**
  90  * struct regulation_constraints - regulator operating constraints.
  91  *
  92  * This struct describes regulator and board/machine specific constraints.
  93  *
  94  * @name: Descriptive name for the constraints, used for display purposes.
  95  *
  96  * @min_uV: Smallest voltage consumers may set.
  97  * @max_uV: Largest voltage consumers may set.
  98  * @uV_offset: Offset applied to voltages from consumer to compensate for
  99  *             voltage drops.
 100  *
 101  * @min_uA: Smallest current consumers may set.
 102  * @max_uA: Largest current consumers may set.
 103  * @ilim_uA: Maximum input current.
 104  * @system_load: Load that isn't captured by any consumer requests.
 105  *
 106  * @valid_modes_mask: Mask of modes which may be configured by consumers.
 107  * @valid_ops_mask: Operations which may be performed by consumers.
 108  *
 109  * @always_on: Set if the regulator should never be disabled.
 110  * @boot_on: Set if the regulator is enabled when the system is initially
 111  *           started.  If the regulator is not enabled by the hardware or
 112  *           bootloader then it will be enabled when the constraints are
 113  *           applied.
 114  * @apply_uV: Apply the voltage constraint when initialising.
 115  * @ramp_disable: Disable ramp delay when initialising or when setting voltage.
 116  * @soft_start: Enable soft start so that voltage ramps slowly.
 117  * @pull_down: Enable pull down when regulator is disabled.
 118  * @over_current_protection: Auto disable on over current event.
 119  *
 120  * @input_uV: Input voltage for regulator when supplied by another regulator.
 121  *
 122  * @state_disk: State for regulator when system is suspended in disk mode.
 123  * @state_mem: State for regulator when system is suspended in mem mode.
 124  * @state_standby: State for regulator when system is suspended in standby
 125  *                 mode.
 126  * @initial_state: Suspend state to set by default.
 127  * @initial_mode: Mode to set at startup.
 128  * @ramp_delay: Time to settle down after voltage change (unit: uV/us)
 129  * @settling_time: Time to settle down after voltage change when voltage
 130  *                 change is non-linear (unit: microseconds).
 131  * @settling_time_up: Time to settle down after voltage increase when voltage
 132  *                    change is non-linear (unit: microseconds).
 133  * @settling_time_down : Time to settle down after voltage decrease when
 134  *                       voltage change is non-linear (unit: microseconds).
 135  * @active_discharge: Enable/disable active discharge. The enum
 136  *                    regulator_active_discharge values are used for
 137  *                    initialisation.
 138  * @enable_time: Turn-on time of the rails (unit: microseconds)
 139  */
 140 struct regulation_constraints {
 141
 142         const char *name;
 143
 144         /* voltage output range (inclusive) - for voltage control */
 145         int min_uV;
 146         int max_uV;
 147
 148         int uV_offset;
 149
 150         /* current output range (inclusive) - for current control */
 151         int min_uA;
 152         int max_uA;
 153         int ilim_uA;
 154
 155         int system_load;
 156
 157         /* valid regulator operating modes for this machine */
 158         unsigned int valid_modes_mask;
 159
 160         /* valid operations for regulator on this machine */
 161         unsigned int valid_ops_mask;
 162
 163         /* regulator input voltage - only if supply is another regulator */
 164         int input_uV;
 165
 166         /* regulator suspend states for global PMIC STANDBY/HIBERNATE */
 167         struct regulator_state state_disk;
 168         struct regulator_state state_mem;
 169         struct regulator_state state_standby;
 170         suspend_state_t initial_state; /* suspend state to set at init */
 171
 172         /* mode to set on startup */
 173         unsigned int initial_mode;
 174
 175         unsigned int ramp_delay;
 176         unsigned int settling_time;
 177         unsigned int settling_time_up;
 178         unsigned int settling_time_down;
 179         unsigned int enable_time;
 180
 181         unsigned int active_discharge;
 182
 183         /* constraint flags */
 184         unsigned always_on:1;   /* regulator never off when system is on */
 185         unsigned boot_on:1;     /* bootloader/firmware enabled regulator */
 186         unsigned apply_uV:1;    /* apply uV constraint if min == max */
 187         unsigned ramp_disable:1; /* disable ramp delay */
 188         unsigned soft_start:1;  /* ramp voltage slowly */
 189         unsigned pull_down:1;   /* pull down resistor when regulator off */
 190         unsigned over_current_protection:1; /* auto disable on over current */
 191 };
 192
 193 /**
 194  * struct regulator_consumer_supply - supply -> device mapping
 195  *
 196  * This maps a supply name to a device. Use of dev_name allows support for
 197  * buses which make struct device available late such as I2C.
 198  *
 199  * @dev_name: Result of dev_name() for the consumer.
 200  * @supply: Name for the supply.
 201  */
 202 struct regulator_consumer_supply {
 203         const char *dev_name;   /* dev_name() for consumer */
 204         const char *supply;     /* consumer supply - e.g. "vcc" */
 205 };
 206
 207 /* Initialize struct regulator_consumer_supply */
 208 #define REGULATOR_SUPPLY(_name, _dev_name)                      \
 209 {                                                               \
 210         .supply         = _name,                                \
 211         .dev_name       = _dev_name,                            \
 212 }
 213
 214 /**
 215  * struct regulator_init_data - regulator platform initialisation data.
 216  *
 217  * Initialisation constraints, our supply and consumers supplies.
 218  *
 219  * @supply_regulator: Parent regulator.  Specified using the regulator name
 220  *                    as it appears in the name field in sysfs, which can
 221  *                    be explicitly set using the constraints field 'name'.
 222  *
 223  * @constraints: Constraints.  These must be specified for the regulator to
 224  *               be usable.
 225  * @num_consumer_supplies: Number of consumer device supplies.
 226  * @consumer_supplies: Consumer device supply configuration.
 227  *
 228  * @regulator_init: Callback invoked when the regulator has been registered.
 229  * @driver_data: Data passed to regulator_init.
 230  */
 231 struct regulator_init_data {
 232         const char *supply_regulator;        /* or NULL for system supply */
 233
 234         struct regulation_constraints constraints;
 235
 236         int num_consumer_supplies;
 237         struct regulator_consumer_supply *consumer_supplies;
 238
 239         /* optional regulator machine specific init */
 240         int (*regulator_init)(void *driver_data);
 241         void *driver_data;      /* core does not touch this */
 242 };
 243
 244 #ifdef CONFIG_REGULATOR
 245 void regulator_has_full_constraints(void);
 246 #else
 247 static inline void regulator_has_full_constraints(void)
 248 {
 249 }
 250 #endif
 251
 252 static inline int regulator_suspend_prepare(suspend_state_t state)
 253 {
 254         return 0;
 255 }
 256 static inline int regulator_suspend_finish(void)
 257 {
 258         return 0;
 259 }
 260
 261 #endif