/* * driver.h -- SoC Regulator driver support. * * Copyright (C) 2007, 2008 Wolfson Microelectronics PLC. * * Author: Liam Girdwood * * 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 Driver Interface. */ #ifndef __LINUX_REGULATOR_DRIVER_H_ #define __LINUX_REGULATOR_DRIVER_H_ #include #include #include struct regmap; struct regulator_dev; struct regulator_init_data; struct regulator_enable_gpio; enum regulator_status { REGULATOR_STATUS_OFF, REGULATOR_STATUS_ON, REGULATOR_STATUS_ERROR, /* fast/normal/idle/standby are flavors of "on" */ REGULATOR_STATUS_FAST, REGULATOR_STATUS_NORMAL, REGULATOR_STATUS_IDLE, REGULATOR_STATUS_STANDBY, /* The regulator is enabled but not regulating */ REGULATOR_STATUS_BYPASS, /* in case that any other status doesn't apply */ REGULATOR_STATUS_UNDEFINED, }; /** * struct regulator_linear_range - specify linear voltage ranges * * Specify a range of voltages for regulator_map_linar_range() and * regulator_list_linear_range(). * * @min_uV: Lowest voltage in range * @min_sel: Lowest selector for range * @max_sel: Highest selector for range * @uV_step: Step size */ struct regulator_linear_range { unsigned int min_uV; unsigned int min_sel; unsigned int max_sel; unsigned int uV_step; }; /* Initialize struct regulator_linear_range */ #define REGULATOR_LINEAR_RANGE(_min_uV, _min_sel, _max_sel, _step_uV) \ { \ .min_uV = _min_uV, \ .min_sel = _min_sel, \ .max_sel = _max_sel, \ .uV_step = _step_uV, \ } /** * struct regulator_ops - regulator operations. * * @enable: Configure the regulator as enabled. * @disable: Configure the regulator as disabled. * @is_enabled: Return 1 if the regulator is enabled, 0 if not. * May also return negative errno. * * @set_voltage: Set the voltage for the regulator within the range specified. * The driver should select the voltage closest to min_uV. * @set_voltage_sel: Set the voltage for the regulator using the specified * selector. * @map_voltage: Convert a voltage into a selector * @get_voltage: Return the currently configured voltage for the regulator. * @get_voltage_sel: Return the currently configured voltage selector for the * regulator. * @list_voltage: Return one of the supported voltages, in microvolts; zero * if the selector indicates a voltage that is unusable on this system; * or negative errno. Selectors range from zero to one less than * regulator_desc.n_voltages. Voltages may be reported in any order. * * @set_current_limit: Configure a limit for a current-limited regulator. * The driver should select the current closest to max_uA. * @get_current_limit: Get the configured limit for a current-limited regulator. * * @set_mode: Set the configured operating mode for the regulator. * @get_mode: Get the configured operating mode for the regulator. * @get_status: Return actual (not as-configured) status of regulator, as a * REGULATOR_STATUS value (or negative errno) * @get_optimum_mode: Get the most efficient operating mode for the regulator * when running with the specified parameters. * * @set_bypass: Set the regulator in bypass mode. * @get_bypass: Get the regulator bypass mode state. * * @enable_time: Time taken for the regulator voltage output voltage to * stabilise after being enabled, in microseconds. * @set_ramp_delay: Set the ramp delay for the regulator. The driver should * select ramp delay equal to or less than(closest) ramp_delay. * @set_voltage_time_sel: Time taken for the regulator voltage output voltage * to stabilise after being set to a new value, in microseconds. * The function provides the from and to voltage selector, the * function should return the worst case. * * @set_suspend_voltage: Set the voltage for the regulator when the system * is suspended. * @set_suspend_enable: Mark the regulator as enabled when the system is * suspended. * @set_suspend_disable: Mark the regulator as disabled when the system is * suspended. * @set_suspend_mode: Set the operating mode for the regulator when the * system is suspended. * * This struct describes regulator operations which can be implemented by * regulator chip drivers. */ struct regulator_ops { /* enumerate supported voltages */ int (*list_voltage) (struct regulator_dev *, unsigned selector); /* get/set regulator voltage */ int (*set_voltage) (struct regulator_dev *, int min_uV, int max_uV, unsigned *selector); int (*map_voltage)(struct regulator_dev *, int min_uV, int max_uV); int (*set_voltage_sel) (struct regulator_dev *, unsigned selector); int (*get_voltage) (struct regulator_dev *); int (*get_voltage_sel) (struct regulator_dev *); /* get/set regulator current */ int (*set_current_limit) (struct regulator_dev *, int min_uA, int max_uA); int (*get_current_limit) (struct regulator_dev *); /* enable/disable regulator */ int (*enable) (struct regulator_dev *); int (*disable) (struct regulator_dev *); int (*is_enabled) (struct regulator_dev *); /* get/set regulator operating mode (defined in consumer.h) */ int (*set_mode) (struct regulator_dev *, unsigned int mode); unsigned int (*get_mode) (struct regulator_dev *); /* Time taken to enable or set voltage on the regulator */ int (*enable_time) (struct regulator_dev *); int (*set_ramp_delay) (struct regulator_dev *, int ramp_delay); int (*set_voltage_time_sel) (struct regulator_dev *, unsigned int old_selector, unsigned int new_selector); /* report regulator status ... most other accessors report * control inputs, this reports results of combining inputs * from Linux (and other sources) with the actual load. * returns REGULATOR_STATUS_* or negative errno. */ int (*get_status)(struct regulator_dev *); /* get most efficient regulator operating mode for load */ unsigned int (*get_optimum_mode) (struct regulator_dev *, int input_uV, int output_uV, int load_uA); /* control and report on bypass mode */ int (*set_bypass)(struct regulator_dev *dev, bool enable); int (*get_bypass)(struct regulator_dev *dev, bool *enable); /* the operations below are for configuration of regulator state when * its parent PMIC enters a global STANDBY/HIBERNATE state */ /* set regulator suspend voltage */ int (*set_suspend_voltage) (struct regulator_dev *, int uV); /* enable/disable regulator in suspend state */ int (*set_suspend_enable) (struct regulator_dev *); int (*set_suspend_disable) (struct regulator_dev *); /* set regulator suspend operating mode (defined in consumer.h) */ int (*set_suspend_mode) (struct regulator_dev *, unsigned int mode); }; /* * Regulators can either control voltage or current. */ enum regulator_type { REGULATOR_VOLTAGE, REGULATOR_CURRENT, }; /** * struct regulator_desc - Static regulator descriptor * * Each regulator registered with the core is described with a * structure of this type and a struct regulator_config. This * structure contains the non-varying parts of the regulator * description. * * @name: Identifying name for the regulator. * @supply_name: Identifying the regulator supply * @of_match: Name used to identify regulator in DT. * @regulators_node: Name of node containing regulator definitions in DT. * @id: Numerical identifier for the regulator. * @ops: Regulator operations table. * @irq: Interrupt number for the regulator. * @type: Indicates if the regulator is a voltage or current regulator. * @owner: Module providing the regulator, used for refcounting. * * @continuous_voltage_range: Indicates if the regulator can set any * voltage within constrains range. * @n_voltages: Number of selectors available for ops.list_voltage(). * * @min_uV: Voltage given by the lowest selector (if linear mapping) * @uV_step: Voltage increase with each selector (if linear mapping) * @linear_min_sel: Minimal selector for starting linear mapping * @fixed_uV: Fixed voltage of rails. * @ramp_delay: Time to settle down after voltage change (unit: uV/us) * @linear_ranges: A constant table of possible voltage ranges. * @n_linear_ranges: Number of entries in the @linear_ranges table. * @volt_table: Voltage mapping table (if table based mapping) * * @vsel_reg: Register for selector when using regulator_regmap_X_voltage_ * @vsel_mask: Mask for register bitfield used for selector * @apply_reg: Register for initiate voltage change on the output when * using regulator_set_voltage_sel_regmap * @apply_bit: Register bitfield used for initiate voltage change on the * output when using regulator_set_voltage_sel_regmap * @enable_reg: Register for control when using regmap enable/disable ops * @enable_mask: Mask for control when using regmap enable/disable ops * @enable_val: Enabling value for control when using regmap enable/disable ops * @disable_val: Disabling value for control when using regmap enable/disable ops * @enable_is_inverted: A flag to indicate set enable_mask bits to disable * when using regulator_enable_regmap and friends APIs. * @bypass_reg: Register for control when using regmap set_bypass * @bypass_mask: Mask for control when using regmap set_bypass * @bypass_val_on: Enabling value for control when using regmap set_bypass * @bypass_val_off: Disabling value for control when using regmap set_bypass * * @enable_time: Time taken for initial enable of regulator (in uS). * @off_on_delay: guard time (in uS), before re-enabling a regulator */ struct regulator_desc { const char *name; const char *supply_name; const char *of_match; const char *regulators_node; int id; bool continuous_voltage_range; unsigned n_voltages; const struct regulator_ops *ops; int irq; enum regulator_type type; struct module *owner; unsigned int min_uV; unsigned int uV_step; unsigned int linear_min_sel; int fixed_uV; unsigned int ramp_delay; const struct regulator_linear_range *linear_ranges; int n_linear_ranges; const unsigned int *volt_table; unsigned int vsel_reg; unsigned int vsel_mask; unsigned int apply_reg; unsigned int apply_bit; unsigned int enable_reg; unsigned int enable_mask; unsigned int enable_val; unsigned int disable_val; bool enable_is_inverted; unsigned int bypass_reg; unsigned int bypass_mask; unsigned int bypass_val_on; unsigned int bypass_val_off; unsigned int enable_time; unsigned int off_on_delay; }; /** * struct regulator_config - Dynamic regulator descriptor * * Each regulator registered with the core is described with a * structure of this type and a struct regulator_desc. This structure * contains the runtime variable parts of the regulator description. * * @dev: struct device for the regulator * @init_data: platform provided init data, passed through by driver * @driver_data: private regulator data * @of_node: OpenFirmware node to parse for device tree bindings (may be * NULL). * @regmap: regmap to use for core regmap helpers if dev_get_regulator() is * insufficient. * @ena_gpio_initialized: GPIO controlling regulator enable was properly * initialized, meaning that >= 0 is a valid gpio * identifier and < 0 is a non existent gpio. * @ena_gpio: GPIO controlling regulator enable. * @ena_gpio_invert: Sense for GPIO enable control. * @ena_gpio_flags: Flags to use when calling gpio_request_one() */ struct regulator_config { struct device *dev; const struct regulator_init_data *init_data; void *driver_data; struct device_node *of_node; struct regmap *regmap; bool ena_gpio_initialized; int ena_gpio; unsigned int ena_gpio_invert:1; unsigned int ena_gpio_flags; }; /* * struct regulator_dev * * Voltage / Current regulator class device. One for each * regulator. * * This should *not* be used directly by anything except the regulator * core and notification injection (which should take the mutex and do * no other direct access). */ struct regulator_dev { const struct regulator_desc *desc; int exclusive; u32 use_count; u32 open_count; u32 bypass_count; /* lists we belong to */ struct list_head list; /* list of all regulators */ /* lists we own */ struct list_head consumer_list; /* consumers we supply */ struct blocking_notifier_head notifier; struct mutex mutex; /* consumer lock */ struct module *owner; struct device dev; struct regulation_constraints *constraints; struct regulator *supply; /* for tree */ struct regmap *regmap; struct delayed_work disable_work; int deferred_disables; void *reg_data; /* regulator_dev data */ struct dentry *debugfs; struct regulator_enable_gpio *ena_pin; unsigned int ena_gpio_state:1; /* time when this regulator was disabled last time */ unsigned long last_off_jiffy; }; struct regulator_dev * regulator_register(const struct regulator_desc *regulator_desc, const struct regulator_config *config); struct regulator_dev * devm_regulator_register(struct device *dev, const struct regulator_desc *regulator_desc, const struct regulator_config *config); void regulator_unregister(struct regulator_dev *rdev); void devm_regulator_unregister(struct device *dev, struct regulator_dev *rdev); int regulator_notifier_call_chain(struct regulator_dev *rdev, unsigned long event, void *data); void *rdev_get_drvdata(struct regulator_dev *rdev); struct device *rdev_get_dev(struct regulator_dev *rdev); int rdev_get_id(struct regulator_dev *rdev); int regulator_mode_to_status(unsigned int); int regulator_list_voltage_linear(struct regulator_dev *rdev, unsigned int selector); int regulator_list_voltage_linear_range(struct regulator_dev *rdev, unsigned int selector); int regulator_list_voltage_table(struct regulator_dev *rdev, unsigned int selector); int regulator_map_voltage_linear(struct regulator_dev *rdev, int min_uV, int max_uV); int regulator_map_voltage_linear_range(struct regulator_dev *rdev, int min_uV, int max_uV); int regulator_map_voltage_iterate(struct regulator_dev *rdev, int min_uV, int max_uV); int regulator_map_voltage_ascend(struct regulator_dev *rdev, int min_uV, int max_uV); int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev); int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel); int regulator_is_enabled_regmap(struct regulator_dev *rdev); int regulator_enable_regmap(struct regulator_dev *rdev); int regulator_disable_regmap(struct regulator_dev *rdev); int regulator_set_voltage_time_sel(struct regulator_dev *rdev, unsigned int old_selector, unsigned int new_selector); int regulator_set_bypass_regmap(struct regulator_dev *rdev, bool enable); int regulator_get_bypass_regmap(struct regulator_dev *rdev, bool *enable); void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data); #endif