include/linux/regulator/gpio-regulator.h

   1 /*
   2  * gpio-regulator.h
   3  *
   4  * Copyright 2011 Heiko Stuebner <heiko@sntech.de>
   5  *
   6  * based on fixed.h
   7  *
   8  * Copyright 2008 Wolfson Microelectronics PLC.
   9  *
  10  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
  11  *
  12  * Copyright (c) 2009 Nokia Corporation
  13  * Roger Quadros <ext-roger.quadros@nokia.com>
  14  *
  15  * This program is free software; you can redistribute it and/or
  16  * modify it under the terms of the GNU General Public License as
  17  * published by the Free Software Foundation; either version 2 of the
  18  * License, or (at your option) any later version.
  19  */
  20
  21 #ifndef __REGULATOR_GPIO_H
  22 #define __REGULATOR_GPIO_H
  23
  24 struct regulator_init_data;
  25
  26 enum regulator_type;
  27
  28 /**
  29  * struct gpio_regulator_state - state description
  30  * @value:              microvolts or microamps
  31  * @gpios:              bitfield of gpio target-states for the value
  32  *
  33  * This structure describes a supported setting of the regulator
  34  * and the necessary gpio-state to achieve it.
  35  *
  36  * The n-th bit in the bitfield describes the state of the n-th GPIO
  37  * from the gpios-array defined in gpio_regulator_config below.
  38  */
  39 struct gpio_regulator_state {
  40         int value;
  41         int gpios;
  42 };
  43
  44 /**
  45  * struct gpio_regulator_config - config structure
  46  * @supply_name:        Name of the regulator supply
  47  * @enable_gpio:        GPIO to use for enable control
  48  *                      set to -EINVAL if not used
  49  * @enable_high:        Polarity of enable GPIO
  50  *                      1 = Active high, 0 = Active low
  51  * @enabled_at_boot:    Whether regulator has been enabled at
  52  *                      boot or not. 1 = Yes, 0 = No
  53  *                      This is used to keep the regulator at
  54  *                      the default state
  55  * @startup_delay:      Start-up time in microseconds
  56  * @gpios:              Array containing the gpios needed to control
  57  *                      the setting of the regulator
  58  * @nr_gpios:           Number of gpios
  59  * @states:             Array of gpio_regulator_state entries describing
  60  *                      the gpio state for specific voltages
  61  * @nr_states:          Number of states available
  62  * @regulator_type:     either REGULATOR_CURRENT or REGULATOR_VOLTAGE
  63  * @init_data:          regulator_init_data
  64  *
  65  * This structure contains gpio-voltage regulator configuration
  66  * information that must be passed by platform code to the
  67  * gpio-voltage regulator driver.
  68  */
  69 struct gpio_regulator_config {
  70         const char *supply_name;
  71
  72         int enable_gpio;
  73         unsigned enable_high:1;
  74         unsigned enabled_at_boot:1;
  75         unsigned startup_delay;
  76
  77         struct gpio *gpios;
  78         int nr_gpios;
  79
  80         struct gpio_regulator_state *states;
  81         int nr_states;
  82
  83         enum regulator_type type;
  84         struct regulator_init_data *init_data;
  85 };
  86
  87 #endif