diff --git a/drivers/regulator/reg-core.c b/drivers/regulator/reg-core.c new file mode 100644 index 0000000..1434697 --- /dev/null +++ b/drivers/regulator/reg-core.c @@ -0,0 +1,1036 @@ +/* + * regulator.c -- Voltage/Current Regulator framework. + * + * Copyright 2007 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 as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#define REGULATOR_VERSION "0.2" + +/* We need to undef the current macro (from include/asm/current.h) otherwise + * our "current" sysfs entry becomes "(get_current())". + */ +#undef current + +static DEFINE_MUTEX(list_mutex); +static LIST_HEAD(regulator_cdevs); + +/** + * struct regulator_cdev + * + * Voltage / Current regulator class device. One for each regulator. + */ +struct regulator_cdev { + struct regulator_desc *desc; + int use_count; + + struct list_head list; + struct list_head consumer_list; + struct blocking_notifier_head notifier; + struct mutex mutex; + struct module *owner; + struct class_device cdev; + struct regulation_constraints *constraints; + struct regulator_cdev *parent; /* for tree */ + + void *reg_data; /* regulator_cdev data */ + void *vendor; /* regulator_cdev vendor extensions */ +}; +#define to_rcdev(cd) \ + container_of(cd, struct regulator_cdev, cdev) + +/* + * struct regulator + * + * One for each consumer device. + */ +struct regulator { + struct device *dev; + struct list_head list; + int uA_load; + int uV_required; + int enabled; + struct device_attribute dev_attr; + struct regulator_cdev *rcdev; +}; + +static int _regulator_is_enabled(struct regulator_cdev *rcdev); +static int _regulator_disable(struct regulator_cdev *rcdev); +static int _regulator_get_voltage(struct regulator_cdev *rcdev); +static int _regulator_get_current(struct regulator_cdev *rcdev); +static unsigned int _regulator_get_mode(struct regulator_cdev *rcdev); + +static struct regulator *get_regulator_load(struct device *dev) +{ + struct regulator *regulator = NULL; + struct regulator_cdev *rcdev; + + list_for_each_entry(rcdev, ®ulator_cdevs, list) { + list_for_each_entry(regulator, &rcdev->consumer_list, list) { + if (regulator->dev == dev) + return regulator; + } + } + return NULL; +} + +static int regulator_check_voltage(struct regulator_cdev *rcdev, int uV) +{ + if (!rcdev->constraints) { + printk(KERN_ERR "%s: no constraints for %s\n", __func__, + rcdev->desc->name); + return -ENODEV; + } + if (!rcdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE) { + printk(KERN_ERR "%s: operation not allowed for %s\n", + __func__, rcdev->desc->name); + return -EPERM; + } + if (uV > rcdev->constraints->max_uV || + uV < rcdev->constraints->min_uV) { + printk(KERN_ERR "%s: invalid voltage %duV for %s\n", + __func__, uV, rcdev->desc->name); + return -EINVAL; + } + return 0; +} + +static int regulator_check_current(struct regulator_cdev *rcdev, int uA) +{ + if (!rcdev->constraints) { + printk(KERN_ERR "%s: no constraints for %s\n", __func__, + rcdev->desc->name); + return -ENODEV; + } + if (!rcdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT) { + printk(KERN_ERR "%s: operation not allowed for %s\n", + __func__, rcdev->desc->name); + return -EPERM; + } + if (uA > rcdev->constraints->max_uA || + uA < rcdev->constraints->min_uA) { + printk(KERN_ERR "%s: invalid current %duA for %s\n", + __func__, uA, rcdev->desc->name); + return -EINVAL; + } + return 0; +} + +static int regulator_check_mode(struct regulator_cdev *rcdev, int mode) +{ + if (!rcdev->constraints) { + printk(KERN_ERR "%s: no constraints for %s\n", __func__, + rcdev->desc->name); + return -ENODEV; + } + if (!rcdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE) { + printk(KERN_ERR "%s: operation not allowed for %s\n", + __func__, rcdev->desc->name); + return -EPERM; + } + if (!rcdev->constraints->valid_modes_mask & mode) { + printk(KERN_ERR "%s: invalid mode %x for %s\n", + __func__, mode, rcdev->desc->name); + return -EINVAL; + } + return 0; +} + +static int regulator_check_drms(struct regulator_cdev *rcdev) +{ + if (!rcdev->constraints) { + printk(KERN_ERR "%s: no constraints for %s\n", __func__, + rcdev->desc->name); + return -ENODEV; + } + if (!rcdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS) { + printk(KERN_ERR "%s: operation not allowed for %s\n", + __func__, rcdev->desc->name); + return -EPERM; + } + return 0; +} + +static ssize_t dev_load_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct regulator *regulator; + + regulator = get_regulator_load(dev); + if (regulator == NULL) + return 0; + + return sprintf(buf, "%d\n", regulator->uA_load); +} + +static ssize_t regulator_uV_show(struct class_device *cdev, char *buf) +{ + struct regulator_cdev *rcdev = to_rcdev(cdev); + + return sprintf(buf, "%d\n", _regulator_get_voltage(rcdev)); +} + +static ssize_t regulator_uA_show(struct class_device *cdev, char *buf) +{ + struct regulator_cdev *rcdev = to_rcdev(cdev); + + return sprintf(buf, "%d\n", _regulator_get_current(rcdev)); +} + +static ssize_t regulator_mode_show(struct class_device *cdev, char *buf) +{ + struct regulator_cdev *rcdev = to_rcdev(cdev); + int mode = _regulator_get_mode(rcdev); + + switch (mode) { + case REGULATOR_MODE_FAST: + return sprintf(buf, "fast\n"); + case REGULATOR_MODE_NORMAL: + return sprintf(buf, "normal\n"); + case REGULATOR_MODE_IDLE: + return sprintf(buf, "idle\n"); + case REGULATOR_MODE_STANDBY: + return sprintf(buf, "standby\n"); + } + return sprintf(buf, "unknown\n"); +} + +static ssize_t regulator_state_show(struct class_device *cdev, char *buf) +{ + struct regulator_cdev *rcdev = to_rcdev(cdev); + int state = _regulator_is_enabled(rcdev); + + if (state > 0) + return sprintf(buf, "enabled\n"); + else if (state == 0) + return sprintf(buf, "disabled\n"); + else + return sprintf(buf, "unknown\n"); +} + +static ssize_t regulator_constraint_uA_show(struct class_device *cdev, char *buf) +{ + struct regulator_cdev *rcdev = to_rcdev(cdev); + + if (!rcdev->constraints) + return sprintf(buf, "constraints not defined\n"); + + return sprintf (buf, "%d %d\n", rcdev->constraints->min_uA, + rcdev->constraints->max_uA); +} + +static ssize_t regulator_constraint_uV_show(struct class_device *cdev, char *buf) +{ + struct regulator_cdev *rcdev = to_rcdev(cdev); + + if (!rcdev->constraints) + return sprintf(buf, "constraints not defined\n"); + + return sprintf (buf, "%d %d\n", rcdev->constraints->min_uV, + rcdev->constraints->max_uV); +} + +static ssize_t regulator_constraint_modes_show(struct class_device *cdev, char *buf) +{ + struct regulator_cdev *rcdev = to_rcdev(cdev); + int count = 0; + + if (!rcdev->constraints) + return sprintf(buf, "constraints not defined\n"); + + if (rcdev->constraints->valid_modes_mask & REGULATOR_MODE_FAST) + count = sprintf (buf, "fast "); + if (rcdev->constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) + count += sprintf (buf + count, "normal "); + if (rcdev->constraints->valid_modes_mask & REGULATOR_MODE_IDLE) + count += sprintf (buf + count, "idle "); + if (rcdev->constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) + count += sprintf (buf + count, "standby"); + count += sprintf(buf + count, "\n"); + return count; +} + +static ssize_t regulator_total_dev_load(struct class_device *cdev, char *buf) +{ + struct regulator_cdev *rcdev = to_rcdev(cdev); + struct regulator *regulator; + int uA = 0; + + list_for_each_entry(regulator, &rcdev->consumer_list, list) + uA =+ regulator->uA_load; + return sprintf(buf, "%d\n", uA); +} + +static ssize_t regulator_enabled_use_count(struct class_device *cdev, char *buf) +{ + struct regulator_cdev *rcdev = to_rcdev(cdev); + return sprintf(buf, "%d\n", rcdev->use_count); +} + +static ssize_t regulator_type_show(struct class_device *cdev, char *buf) +{ + struct regulator_cdev *rcdev = to_rcdev(cdev); + + switch (rcdev->desc->type) { + case REGULATOR_VOLTAGE: + return sprintf(buf, "voltage\n"); + case REGULATOR_CURRENT: + return sprintf(buf, "current\n"); + } + return sprintf(buf, "unknown\n"); +} + +static struct class_device_attribute regulator_dev_attrs[] = { + __ATTR(voltage, 0444, regulator_uV_show, NULL), + __ATTR(current, 0444, regulator_uA_show, NULL), + __ATTR(opmode, 0444, regulator_mode_show, NULL), + __ATTR(enabled, 0444, regulator_state_show, NULL), + __ATTR(voltage_limits, 0444, regulator_constraint_uA_show, NULL), + __ATTR(current_limits, 0444, regulator_constraint_uV_show, NULL), + __ATTR(valid_opmodes, 0444, regulator_constraint_modes_show, NULL), + __ATTR(total_load, 0444, regulator_total_dev_load, NULL), + __ATTR(enabled_count, 0444, regulator_enabled_use_count, NULL), + __ATTR(type, 0444, regulator_type_show, NULL), + __ATTR_NULL, +}; + +static void regulator_dev_release(struct class_device *class_dev) {} + +struct class regulator_class = { + .name = "regulator", + .release = regulator_dev_release, + .class_dev_attrs = regulator_dev_attrs, +}; + +/* find the lowest stable voltage that all enabled clients can operate at */ +static int get_lowest_stable_voltage(struct regulator_cdev *rcdev) +{ + struct regulator *regulator; + int highest_uV = 0; + + list_for_each_entry(regulator, &rcdev->consumer_list, list) { + if (regulator->enabled && regulator->uV_required > highest_uV) + highest_uV = regulator->uV_required; + } + return highest_uV; +} + +/* set the regulator voltage to the lowest possible value that can safely + * support all the client devices */ +static int regulator_set_stable_voltage(struct regulator_cdev *rcdev) +{ + int ret = 0, uV; + + if (rcdev->desc->type == REGULATOR_VOLTAGE) { + uV = get_lowest_stable_voltage(rcdev); + if (uV && rcdev->desc->ops->set_voltage) + ret = rcdev->desc->ops->set_voltage(rcdev, uV); + } + return ret; +} + +static void regulator_load_change (struct regulator_cdev *rcdev) +{ + struct regulator *sibling; + int current_uA = 0, output_uV, input_uV, err; + unsigned int mode; + + err = regulator_check_drms(rcdev); + if (err < 0 || !rcdev->desc->ops->get_optimum_mode || + !rcdev->desc->ops->get_voltage || !rcdev->desc->ops->set_mode); + return; + + /* get output voltage */ + output_uV = rcdev->desc->ops->get_voltage(rcdev); + + /* get input voltage */ + if (rcdev->parent && rcdev->parent->desc->ops->get_voltage) + input_uV = rcdev->parent->desc->ops->get_voltage(rcdev->parent); + else + input_uV = rcdev->constraints->input_uV; + + /* calc total requested load */ + list_for_each_entry(sibling, &rcdev->consumer_list, list) + current_uA += sibling->uA_load; + + /* now get the optimum mode for our new total regulator load */ + mode = rcdev->desc->ops->get_optimum_mode(rcdev, input_uV, + output_uV, current_uA); + + /* check the new mode is allowed */ + err = regulator_check_mode(rcdev, mode); + if (err == 0) + rcdev->desc->ops->set_mode(rcdev, mode); +} + +static void print_constraints(struct regulator_cdev *rcdev) +{ + struct regulation_constraints *constraints = rcdev->constraints; + char buf[80]; + int count; + + if (rcdev->desc->type == REGULATOR_VOLTAGE) { + if (constraints->min_uV == constraints->max_uV) + count = sprintf(buf, "%d mV ", + uV_to_mV(constraints->min_uV)); + else + count = sprintf(buf, "%d <--> %d mV ", + uV_to_mV(constraints->min_uV), + uV_to_mV(constraints->max_uV)); + } else { + if (constraints->min_uA == constraints->max_uA) + count = sprintf(buf, "%d mA ", + uA_to_mA(constraints->min_uA)); + else + count = sprintf(buf, "%d <--> %d mA ", + uA_to_mA(constraints->min_uA), + uA_to_mA(constraints->max_uA)); + } + if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) + count += sprintf (buf + count, "fast "); + if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) + count += sprintf (buf + count, "normal "); + if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) + count += sprintf (buf + count, "idle "); + if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) + count += sprintf (buf + count, "standby"); + + printk(KERN_INFO "regulator: %s: %s\n", rcdev->desc->name, buf); +} + +static struct regulator *create_regulator(struct regulator_cdev *rcdev, + struct device *dev) +{ + struct regulator *regulator; + char buf[32]; + int err; + + regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); + if (regulator == NULL) + return NULL; + + regulator->rcdev = rcdev; + sprintf(buf, "current_requested-%s", regulator->rcdev->desc->name); + list_add(®ulator->list, &rcdev->consumer_list); + + if (dev == NULL) + goto out; + + regulator->dev = dev; + regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); + if (regulator->dev_attr.attr.name == NULL) + goto err_out; + regulator->dev_attr.attr.owner = THIS_MODULE; + regulator->dev_attr.attr.mode = 0444; + regulator->dev_attr.show = dev_load_show; + err = device_create_file(dev, ®ulator->dev_attr); + if (err < 0) { + printk(KERN_WARNING "%s: could not add regulator_cdev load" + " sysfs\n", __func__); + goto err_out; + } + err = sysfs_create_link(&rcdev->cdev.kobj, &dev->kobj, + dev->kobj.name); + if (err) { + printk(KERN_WARNING "%s : could not add device link %s err %d\n", + __func__, dev->kobj.name, err); + goto err_out; + } +out: + return regulator; +err_out: + kfree(regulator->dev_attr.attr.name); + list_del(®ulator->list); + kfree(regulator); + return NULL; +} + +struct regulator *regulator_get(struct device *dev, const char *id) +{ + struct regulator_cdev *rcdev; + struct regulator *regulator = ERR_PTR(-ENODEV); + + if (id == NULL) + return regulator; + + mutex_lock(&list_mutex); + list_for_each_entry(rcdev, ®ulator_cdevs, list) { + if (strcmp(id, rcdev->desc->name) == 0 && + try_module_get(rcdev->owner)) { + goto found; + } + } + printk(KERN_ERR "regulator: Unable to get requested regulator: %s\n", id); + mutex_unlock(&list_mutex); + return regulator; + +found: + regulator = create_regulator(rcdev, dev); + if (regulator == NULL) { + regulator = ERR_PTR(-ENOMEM); + module_put(rcdev->owner); + } + + mutex_unlock(&list_mutex); + return regulator; +} +EXPORT_SYMBOL_GPL(regulator_get); + +void regulator_put(struct regulator *regulator) +{ + struct regulator_cdev *rcdev = regulator->rcdev; + + if (regulator == NULL || IS_ERR(regulator)) + return; + + /* remove any sysfs entries */ + if (regulator->dev) { + sysfs_remove_link(&rcdev->cdev.kobj, regulator->dev->kobj.name); + device_remove_file(regulator->dev, ®ulator->dev_attr); + } + list_del(®ulator->list); + kfree(regulator->dev_attr.attr.name); + kfree(regulator); + + module_put(rcdev->owner); + mutex_unlock(&list_mutex); +} +EXPORT_SYMBOL_GPL(regulator_put); + +static int _regulator_enable(struct regulator_cdev *rcdev) +{ + int ret = 0; + + /* if the regulator is currently disabled make sure we check + * it's parent, mode and required voltage */ + if (rcdev->use_count == 0) { + if (rcdev->parent) { + ret = _regulator_enable(rcdev->parent); + if (ret < 0) { + printk(KERN_ERR "%s: failed to enable %s\n", + __func__, rcdev->desc->name); + goto out; + } + } + if (rcdev->desc->ops->enable) { + ret = regulator_set_stable_voltage(rcdev); + if (ret < 0) { + printk(KERN_ERR "%s: invalid voltage for %s\n", + __func__, rcdev->desc->name); + goto out; + } + regulator_load_change(rcdev); + ret = rcdev->desc->ops->enable(rcdev); + if (ret < 0) { + printk(KERN_ERR "%s: failed to enable %s\n", + __func__, rcdev->desc->name); + goto out; + } + } + } else { + ret = regulator_set_stable_voltage(rcdev); + if (ret < 0) { + printk(KERN_ERR "%s: invalid voltage for %s\n", + __func__, rcdev->desc->name); + goto out; + } + regulator_load_change(rcdev); + } + rcdev->use_count++; +out: + return ret; +} + +int regulator_enable(struct regulator *regulator) +{ + int ret; + + mutex_lock(®ulator->rcdev->mutex); + regulator->enabled = 1; + ret = _regulator_enable(regulator->rcdev); + if (ret < 0) + regulator->enabled = 0; + mutex_unlock(®ulator->rcdev->mutex); + return ret; +} +EXPORT_SYMBOL_GPL(regulator_enable); + +static int _regulator_disable(struct regulator_cdev *rcdev) +{ + int ret = 0; + + /* make sure we are the last user before disabling this regulator */ + if (rcdev->use_count == 1) { + if (rcdev->desc->ops->disable) { + ret = rcdev->desc->ops->disable(rcdev); + if (ret < 0) { + printk(KERN_ERR "%s: failed to disable %s\n", + __func__, rcdev->desc->name); + goto out; + } + } + /* decrease parent ref count and disable if required */ + if (rcdev->parent) + _regulator_disable(rcdev->parent); + } else { + /* set to next best requested voltage and mode */ + ret = regulator_set_stable_voltage(rcdev); + regulator_load_change(rcdev); + } + rcdev->use_count--; +out: + if (rcdev->use_count < 0) { + printk(KERN_ERR "%s: tried to disable too many times\n", + __func__); + rcdev->use_count = 0; + } + return ret; +} + +int regulator_disable(struct regulator *regulator) +{ + int ret; + + mutex_lock(®ulator->rcdev->mutex); + regulator->enabled = 0; + regulator->uA_load = 0; + ret = _regulator_disable(regulator->rcdev); + if (ret < 0) + regulator->enabled = 1; + mutex_unlock(®ulator->rcdev->mutex); + return ret; +} +EXPORT_SYMBOL_GPL(regulator_disable); + +static int _regulator_is_enabled(struct regulator_cdev *rcdev) +{ + int ret; + + mutex_lock(&rcdev->mutex); + + /* sanity check */ + if (!rcdev->desc->ops->is_enabled) { + ret = -EINVAL; + goto out; + } + + ret = rcdev->desc->ops->is_enabled(rcdev); +out: + mutex_unlock(&rcdev->mutex); + return ret; +} + +int regulator_is_enabled(struct regulator *regulator) +{ + return _regulator_is_enabled(regulator->rcdev); +} +EXPORT_SYMBOL_GPL(regulator_is_enabled); + +int regulator_set_voltage(struct regulator *regulator, int uV) +{ + struct regulator_cdev *rcdev = regulator->rcdev; + int ret; + + mutex_lock(&rcdev->mutex); + + /* sanity check */ + if (!rcdev->desc->ops->set_voltage) { + ret = -EINVAL; + goto out; + } + + /* constraints check */ + ret = regulator_check_voltage(rcdev, uV); + if (ret < 0) + goto out; + regulator->uV_required = uV; + + /* only set the new voltage if it's all clients can use it */ + ret = regulator_set_stable_voltage(rcdev); +out: + mutex_unlock(&rcdev->mutex); + return ret; +} +EXPORT_SYMBOL_GPL(regulator_set_voltage); + +static int _regulator_get_voltage(struct regulator_cdev *rcdev) +{ + int ret; + + mutex_lock(&rcdev->mutex); + + /* sanity check */ + if (!rcdev->desc->ops->get_voltage) { + ret = -EINVAL; + goto out; + } + + ret = rcdev->desc->ops->get_voltage(rcdev); +out: + mutex_unlock(&rcdev->mutex); + return ret; +} + +int regulator_get_voltage(struct regulator *regulator) +{ + return _regulator_get_voltage(regulator->rcdev); +} +EXPORT_SYMBOL_GPL(regulator_get_voltage); + +int regulator_set_current(struct regulator *regulator, int uA) +{ + struct regulator_cdev *rcdev = regulator->rcdev; + int ret; + + mutex_lock(&rcdev->mutex); + + /* sanity check */ + if (!rcdev->desc->ops->set_current) { + ret = -EINVAL; + goto out; + } + + /* constraints check */ + ret = regulator_check_current(rcdev, uA); + if (ret < 0) + goto out; + + ret = rcdev->desc->ops->set_current(rcdev, uA); +out: + mutex_unlock(&rcdev->mutex); + return ret; +} +EXPORT_SYMBOL_GPL(regulator_set_current); + +static int _regulator_get_current(struct regulator_cdev *rcdev) +{ + int ret; + + mutex_lock(&rcdev->mutex); + + /* sanity check */ + if (!rcdev->desc->ops->get_current) { + ret = -EINVAL; + goto out; + } + + ret = rcdev->desc->ops->get_current(rcdev); +out: + mutex_unlock(&rcdev->mutex); + return ret; +} + +int regulator_get_current(struct regulator *regulator) +{ + return _regulator_get_current(regulator->rcdev); +} +EXPORT_SYMBOL_GPL(regulator_get_current); + +int regulator_set_mode(struct regulator *regulator, unsigned int mode) +{ + struct regulator_cdev *rcdev = regulator->rcdev; + int ret; + + mutex_lock(&rcdev->mutex); + + /* sanity check */ + if (!rcdev->desc->ops->set_mode) { + ret = -EINVAL; + goto out; + } + + /* constraints check */ + ret = regulator_check_mode(rcdev, mode); + if (ret < 0) + goto out; + + ret = rcdev->desc->ops->set_mode(rcdev, mode); +out: + mutex_unlock(&rcdev->mutex); + return ret; +} +EXPORT_SYMBOL_GPL(regulator_set_mode); + +static unsigned int _regulator_get_mode(struct regulator_cdev *rcdev) +{ + int ret; + + mutex_lock(&rcdev->mutex); + + /* sanity check */ + if (!rcdev->desc->ops->get_mode) { + ret = -EINVAL; + goto out; + } + + ret = rcdev->desc->ops->get_mode(rcdev); +out: + mutex_unlock(&rcdev->mutex); + return ret; +} + +unsigned int regulator_get_mode(struct regulator *regulator) +{ + return _regulator_get_mode(regulator->rcdev); +} +EXPORT_SYMBOL_GPL(regulator_get_mode); + +static unsigned int _regulator_get_optimum_mode(struct regulator_cdev *rcdev, + int input_uV, int output_uV, int load_uA) +{ + int ret; + + mutex_lock(&rcdev->mutex); + + /* sanity check */ + if (!rcdev->desc->ops->get_optimum_mode) { + ret = -EINVAL; + goto out; + } + + ret = rcdev->desc->ops->get_optimum_mode(rcdev, + input_uV, output_uV, load_uA); +out: + mutex_unlock(&rcdev->mutex); + return ret; +} + +unsigned int regulator_get_optimum_mode(struct regulator *regulator, + int input_uV, int output_uV, int load_uA) +{ + return _regulator_get_optimum_mode(regulator->rcdev, input_uV, + output_uV, load_uA); +} +EXPORT_SYMBOL_GPL(regulator_get_optimum_mode); + +int regulator_register_client(struct regulator *regulator, + struct notifier_block *nb) +{ + return blocking_notifier_chain_register(®ulator->rcdev->notifier, nb); +} +EXPORT_SYMBOL_GPL(regulator_register_client); + +int regulator_unregister_client(struct regulator *regulator, + struct notifier_block *nb) +{ + return blocking_notifier_chain_unregister(®ulator->rcdev->notifier, nb); +} +EXPORT_SYMBOL_GPL(regulator_unregister_client); + +int regulator_notifier_call_chain(struct regulator_cdev *rcdev, + unsigned long event, void *data) +{ + return blocking_notifier_call_chain(&rcdev->notifier, event, data); +} +EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); + +struct regulator_cdev *regulator_register( + struct regulator_desc *regulator_desc, void *reg_data) +{ + static atomic_t regulator_no = ATOMIC_INIT(0); + struct regulator_cdev *rcdev; + int ret; + + if (regulator_desc == NULL) + return ERR_PTR(-EINVAL); + + if (regulator_desc->name == NULL || regulator_desc->ops == NULL) + return ERR_PTR(-EINVAL); + + if (!regulator_desc->type == REGULATOR_VOLTAGE && + !regulator_desc->type == REGULATOR_CURRENT) + return ERR_PTR(-EINVAL); + + rcdev = kzalloc(sizeof(struct regulator_cdev), GFP_KERNEL); + if (rcdev == NULL) + return ERR_PTR(-ENOMEM); + + mutex_lock(&list_mutex); + + mutex_init(&rcdev->mutex); + rcdev->reg_data = reg_data; + rcdev->owner = regulator_desc->owner; + rcdev->desc = regulator_desc; + INIT_LIST_HEAD(&rcdev->consumer_list); + INIT_LIST_HEAD(&rcdev->list); + BLOCKING_INIT_NOTIFIER_HEAD(&rcdev->notifier); + + rcdev->cdev.class = ®ulator_class; + class_device_initialize(&rcdev->cdev); + snprintf(rcdev->cdev.class_id, sizeof(rcdev->cdev.class_id), + "regulator-%ld-%s", + (unsigned long) atomic_inc_return(®ulator_no) - 1, + regulator_desc->name); + + ret = class_device_add(&rcdev->cdev); + if (ret == 0) + list_add(&rcdev->list, ®ulator_cdevs); + else { + kfree(rcdev); + rcdev = ERR_PTR(ret); + } + mutex_unlock(&list_mutex); + return rcdev; +} +EXPORT_SYMBOL_GPL(regulator_register); + +void regulator_unregister(struct regulator_cdev *rcdev) +{ + if (rcdev == NULL) + return; + + mutex_lock(&list_mutex); + list_del(&rcdev->list); + if (rcdev->parent) + sysfs_remove_link(&rcdev->cdev.kobj, "source"); + class_device_unregister(&rcdev->cdev); + kfree(rcdev); + mutex_unlock(&list_mutex); +} +EXPORT_SYMBOL_GPL(regulator_unregister); + +int regulator_set_platform_source(const char *regulator_source, + const char *regulator_parent) +{ + struct regulator_cdev *source_rcdev, *parent_rcdev; + int err; + + if (regulator_source == NULL || regulator_parent == NULL) + return -EINVAL; + + mutex_lock(&list_mutex); + + list_for_each_entry(source_rcdev, ®ulator_cdevs, list) { + if (!strcmp(source_rcdev->desc->name, regulator_source)) + goto found_source; + } + mutex_unlock(&list_mutex); + return -ENODEV; + +found_source: + list_for_each_entry(parent_rcdev, ®ulator_cdevs, list) { + if (!strcmp(parent_rcdev->desc->name, regulator_parent)) + goto found_parent; + } + mutex_unlock(&list_mutex); + return -ENODEV; + +found_parent: + source_rcdev->parent = parent_rcdev; + err = sysfs_create_link(&source_rcdev->cdev.kobj, &parent_rcdev->cdev.kobj, + "source"); + if (err) + printk(KERN_WARNING "%s : could not add device link %s err %d\n", + __func__, parent_rcdev->cdev.kobj.name, err); + mutex_unlock(&list_mutex); + return 0; +} +EXPORT_SYMBOL_GPL(regulator_set_platform_source); + +const char *regulator_get_platform_source(const char *regulator_name) +{ + struct regulator_cdev *rcdev; + + if (regulator_name == NULL) + return NULL; + + mutex_lock(&list_mutex); + list_for_each_entry(rcdev, ®ulator_cdevs, list) { + if (!strcmp(rcdev->desc->name, regulator_name)) + goto found; + } + mutex_unlock(&list_mutex); + return NULL; + +found: + mutex_unlock(&list_mutex); + if (rcdev->parent) + return rcdev->parent->desc->name; + else + return NULL; +} +EXPORT_SYMBOL_GPL(regulator_get_platform_source); + +int regulator_set_platform_constraints(const char *regulator_name, + struct regulation_constraints *constraints) +{ + struct regulator_cdev *rcdev; + + if (regulator_name == NULL) + return -EINVAL; + + mutex_lock(&list_mutex); + list_for_each_entry(rcdev, ®ulator_cdevs, list) { + if (!strcmp(regulator_name, rcdev->desc->name)) { + mutex_lock(&rcdev->mutex); + rcdev->constraints = constraints; + print_constraints(rcdev); + mutex_unlock(&rcdev->mutex); + mutex_unlock(&list_mutex); + return 0; + } + } + mutex_unlock(&list_mutex); + return -ENODEV; +} +EXPORT_SYMBOL_GPL(regulator_set_platform_constraints); + +void regulator_drms_notify_load(struct regulator *regulator, int uA) +{ + struct regulator_cdev *rcdev = regulator->rcdev; + + mutex_lock(&rcdev->mutex); + regulator->uA_load = uA; + regulator_load_change (rcdev); + mutex_unlock(&rcdev->mutex); +} +EXPORT_SYMBOL_GPL(regulator_drms_notify_load); + +void *regulator_get_drvdata(struct regulator *regulator) +{ + return regulator->rcdev->reg_data; +} +EXPORT_SYMBOL_GPL(regulator_get_drvdata); + +void regulator_set_drvdata(struct regulator *regulator, void *data) +{ + regulator->rcdev->reg_data = data; +} +EXPORT_SYMBOL_GPL(regulator_set_drvdata); + +int rcdev_get_id (struct regulator_cdev *rcdev) +{ + return rcdev->desc->id; +} +EXPORT_SYMBOL_GPL(rcdev_get_id); + +void *rcdev_get_drvdata (struct regulator_cdev *rcdev) +{ + return rcdev->reg_data; +} +EXPORT_SYMBOL_GPL(rcdev_get_drvdata); + +static int __init regulator_init(void) +{ + printk(KERN_INFO "regulator: core version %s\n", REGULATOR_VERSION); + return class_register(®ulator_class); +} + +/* init early to allow our consumers to complete system booting */ +core_initcall(regulator_init); diff --git a/include/linux/regulator/regulator.h b/include/linux/regulator/regulator.h new file mode 100644 index 0000000..c604a2a --- /dev/null +++ b/include/linux/regulator/regulator.h @@ -0,0 +1,363 @@ +/* + * regulator.h -- SoC Regulator 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 Client Interface. + * + * A Power Management Regulator framework for SoC based devices. + * Features:- + * o Voltage and current level control. + * o Operating mode control. + * o Regulator status. + * o sysfs entries for showing client devices and status + * + * EXPERIMENTAL FEATURES: + * Dynamic Regulator operating Mode Switching (DRMS) - allows regulators + * to use most efficient operating mode depending upon voltage and load and + * is transparent to client drivers. + * + * e.g. Devices x,y,z share regulator r. Device x and y draw 20mA each during + * IO and 1mA at idle. Device z draws 100mA when under load and 5mA when + * idling. Regulator r has > 90% efficieny in NORMAL mode at loads > 100mA + * but this drops rapidly to 60% when below 100mA. Regulator r has > 90% + * efficiency in IDLE mode at loads < 10mA. Thus regulator r will operate + * in normal mode for loads > 10mA and in IDLE mode for load <= 10mA. + * + * Dynamic Regulator Voltage Selection (DRVS). Selects the lowest voltage + * output (within system constraints) for a regulator shared between several + * devices. This allows all devices to operate within their voltage range and + * will dynamically change the voltage when devices disable() thier supply + * to the next best level (thus saving power). This is based on an idea + * by Amit Kucheria in an RFC to lakml. + * + * e.g. devices x,y,z share regulator r. device x and y can operate between + * 1800mV and 1900mV, whilst device z can only operate at 1900mV. Regulator + * r will output 1900mV when all devices are in use and 1800mV when devices + * x and y are in use and device z is disabled. + */ + + +#ifndef __LINUX_REGULATOR_H_ +#define __LINUX_REGULATOR_H_ + +/* + * Regulator operating modes. + * + * Regulators can run in a variety of different operating modes depending on + * output load. This allows further system power savings by selecting the + * best (and most efficient) regulator mode for a desired load. + * + * Most drivers will only care about NORMAL. The modes below are generic and + * will probably not match the naming convention of your regulator data sheet + * but should match the use cases in the datasheet. + * + * In order of power efficiency (least efficient at top). + * + * Mode Description + * FAST Regulator can handle fast changes in it's load. + * e.g. useful in CPU voltage & frequency scaling where + * load can quickly increase with CPU freqency increases. + * + * NORMAL Normal regulator power supply mode. Most drivers will + * use this mode. + * + * IDLE Regulator runs in a more efficient mode for light + * loads. Can be used for devices that have a low power + * requirement during periods of inactivity. This mode + * may be more noisy than NORMAL and may not be able + * to handle fast load switching. + * + * STANDBY Regulator runs in the most efficient mode for very + * light loads. Can be used by devices when they are + * in a sleep/standby state. This mode is likely to be + * the most noisy and may not be able to handle fast load + * switching. + * + * NOTE: Most regulators will only support a subset of these modes. Some + * will only just support NORMAL. + */ + +#define REGULATOR_MODE_FAST 0x1 +#define REGULATOR_MODE_NORMAL 0x2 +#define REGULATOR_MODE_IDLE 0x4 +#define REGULATOR_MODE_STANDBY 0x8 + +/* + * Regulator notifier events. + * + * @UNDER_VOLTAGE: Regulator output is under voltage. + * @OVER_CURRENT: Regulator output current is too high. + * @POWER_ON: Regulator power ON event. + * @POWER_OFF: Regulator power OFF event. + * @REGULATION_OUT: Regulator output is out of regulation. + * @FAIL: Regulator output has failed. + * @OVER_TEMP: Regulator over temp. + */ + +#define REGULATOR_EVENT_UNDER_VOLTAGE 0x1 +#define REGULATOR_EVENT_OVER_CURRENT 0x2 +#define REGULATOR_EVENT_POWER_ON 0x4 +#define REGULATOR_EVENT_POWER_OFF 0x8 +#define REGULATOR_EVENT_REGULATION_OUT 0x10 +#define REGULATOR_EVENT_FAIL 0x20 +#define REGULATOR_EVENT_OVER_TEMP 0x40 + +/* + * Convenience conversion. + * Here atm, maybe there is somewhere better for this. + */ +#define mV_to_uV(mV) (mV * 1000) +#define uV_to_mV(uV) (uV / 1000) +#define V_to_uV(V) (mV_to_uV(V * 1000)) +#define uV_to_V(uV) (uV_to_mV(uV) / 1000) +#define mA_to_uA(mA) (mA * 1000) +#define uA_to_mA(uA) (uA / 1000) +#define A_to_uA(A) (mA_to_uA(A * 1000)) +#define uA_to_A(uA) (uA_to_mA(uA) / 1000) + +struct regulator; + +#if defined (CONFIG_REGULATOR_API) + +/** + * regulator_get - lookup and obtain a reference to a regulator. + * @dev: device for regulator "consumer" + * @id: regulator ID + * + * Returns a struct regulator corresponding to the regulator producer, or + * IS_ERR() condition containing errno. + */ +struct regulator * __must_check regulator_get(struct device *dev, const char *id); + +/** + * regulator_put - "free" the regulator source + * @regulator: regulator source + * + * Note: drivers must ensure that all regulator_enable calls made on this + * regulator source are balanced by regulator_disable calls prior to calling + * this function. + */ +void regulator_put(struct regulator *regulator); + +/** + * regulator_enable - enable regulator output + * @regulator: regulator source + * + * Enable the regulator output at the predefined voltage or current value. + * NOTE: the output value can be set by other drivers, bootloader or may be + * hardwired in the regulator. + */ +int regulator_enable(struct regulator *regulator); + +/** + * regulator_disable - disable regulator output + * @regulator: regulator source + * + * Disable the regulator output voltage or current. + * NOTE: this will only disable the regulator output iff no other consumer + * devices have it enabled. + */ +int regulator_disable(struct regulator *regulator); + +/** + * regulator_is_enabled - is the regulator output enabled + * @regulator: regulator source + * + * Returns zero for disabled otherwise return number of enable requests. + */ +int regulator_is_enabled(struct regulator *regulator); + +/** + * regulator_set_voltage - set regulator output voltage + * @regulator: regulator source + * @uV: voltage in uV + * + * Sets a voltage regulator to the desired output voltage. This can be set + * during any regulator state. IOW, regulator can be disabled or enabled. + * + * If the regulator is enabled then the voltage will change to the new value + * immediately otherwise if the regulator is disabled the regulator will + * output at the new voltage when enabled. + * + * NOTE: If the regulator is shared between several devices then the lowest + * request voltage that meets the system constraints will be used. + * NOTE: Regulator system constraints must be set for this regulator before + * calling this function otherwise this call will fail. + */ +int regulator_set_voltage(struct regulator *regulator, int uV); + +/** + * regulator_get_voltage - get regulator output voltage + * @regulator: regulator source + * + * This returns the current regulator voltage in uV. + * + * NOTE: If the regulator is disabled it will return the voltage value. This + * function should not be used to determine regulator state. + */ +int regulator_get_voltage(struct regulator *regulator); + +/** + * regulator_set_current - set regulator output current for a current sink + * @regulator: regulator source + * @uA: current in uA + * + * Sets current sink to the desired output current. This can be set during + * any regulator state. IOW, regulator can be disabled or enabled. + * + * If the regulator is enabled then the current will change to the new value + * immediately otherwise if the regulator is disabled the regulator will + * output at the new current when enabled. + * + * NOTE: Regulator system constraints must be set for this regulator before + * calling this function otherwise this call will fail. + */ +int regulator_set_current(struct regulator *regulator, int uA); + +/** + * regulator_get_current - get regulator output current + * @regulator: regulator source + * + * This returns the current supplied by the specified current sink in uA. + * + * NOTE: If the regulator is disabled it will return the current value. This + * function should not be used to determine regulator state. + */ +int regulator_get_current(struct regulator *regulator); + +/** + * regulator_set_mode - set regulator operating mode + * @regulator: regulator source + * @mode: operating mode - one of the REGULATOR_MODE constants + * + * Set regulator operating mode to increase regulator efficiency or improve + * regulation performance. + * + * NOTE: Regulator system constraints must be set for this regulator before + * calling this function otherwise this call will fail. + */ +int regulator_set_mode(struct regulator *regulator, unsigned int mode); + +/** + * regulator_get_mode - set regulator operating mode + * @regulator: regulator source + * + * Get the current regulator operating mode. + */ +unsigned int regulator_get_mode(struct regulator *regulator); + +/** + * regulator_get_optimum_mode - get regulator optimum operating mode + * @regulator: regulator source + * @input_uV: input voltage + * @output_uV: output voltage + * @load_uV: load current + * + * Get the most efficient regulator operating mode for the given input + * and output voltages at a specific load.. + */ +unsigned int regulator_get_optimum_mode(struct regulator *regulator, + int input_uV, int output_uV, int load_uA); + +/** + * regulator_register_client - register regulator event notifier + * @regulator: regulator source + * @notifier_block: notifier block + * + * Register notifier block to receive regulator events. + */ +int regulator_register_client(struct regulator *regulator, + struct notifier_block *nb); + +/** + * regulator_unregister_client - unregister regulator event notifier + * @regulator: regulator source + * @notifier_block: notifier block + * + * Unregister regulator event notifier block. + */ +int regulator_unregister_client(struct regulator *regulator, + struct notifier_block *nb); + +/** + * regulator_notify_load - notify regulator of new device load + * @regulator: regulator + * @dev: device + * @uA: load + * + * Notifies the regulator core of a new device load. This is then used by + * DRMS (if enabled by constraints) to select the most efficient regulator + * operating mode for the new regulator loading. + * + * Client devices notify their supply regulator of the maximum power + * they will require (can be taken from device datasheet in the power + * consumption tables) when they change operational status and hence power + * state. Examples of operational state changes that can affect power + * consumption are :- + * + * o Device is opened / closed. + * o Device I/O is about to begin or has just finished. + * o Device is idling in between work. + * + * This information is also exported via sysfs to userspace. + * + * DRMS would then sum the total requested load on the regulator and change + * to the most efficient operating mode if platform constraints allow. + */ +void regulator_drms_notify_load(struct regulator *regulator, int uA); + +/** + * regulator_get_drvdata - get regulator driver data + * @regulator: regulator + */ +void *regulator_get_drvdata(struct regulator *regulator); + +/** + * regulator_set_drvdata - get regulator driver data + * @regulator: regulator + * @data: data + */ +void regulator_set_drvdata(struct regulator *regulator, void *data); + +#else + +/* + * Make sure client drivers will still build on systems with no software + * controllable voltage or current regulators. + */ +#define regulator_get(dev, id) ({ (void)(dev); (void)(id); NULL; }) +#define regulator_put(regulator) do { (void)(regulator);} while (0) +#define regulator_enable(regulator) ({ (void)(regulator); 0; }) +#define regulator_disable(regulator) ({ (void)(regulator); 0; }) +#define regulator_is_enabled(regulator) ({ (void)(regulator); 1; }) +#define regulator_set_voltage(regulator, uV) \ + ({ (void)(regulator); (void)(uV); 0; }) +#define regulator_get_voltage(regulator) ({ (void)(regulator); 0; }) +#define regulator_set_current(regulator, uA) \ + ({ (void)(regulator); (void)(uA); 0; }) +#define regulator_get_current(regulator) ({ (void)(regulator); 0; }) +#define regulator_set_mode(regulator, mode) \ + ({ (void)(regulator); (void)(mode); 0; }) +#define regulator_get_mode(regulator) ({ (void)(regulator); 0; }) +#define regulator_get_optimum_mode(regulator, input_uV, output_uV, load_uA) \ + ({ (void)(regulator); (void)(input_uV); (void)(output_uV); (void)(load_uA); 0; }) +#define regulator_register_client(regulator, nb) \ + ({ (void)(regulator); (void)(nb); 0; }) +#define regulator_unregister_client(regulator, nb) \ + do { (void)(regulator); (void)(nb);} while (0) +#define regulator_notify_load(regulator, dev, uA) \ + do { (void)(regulator); (void)(dev); (void)(uA);} while (0) +#define regulator_get_drvdata(regulator) ({ (void)(regulator); NULL; }) +#define regulator_set_drvdata(regulator, data) \ + do { (void)(regulator); (void)(data);} while (0) + +#endif + +#endif diff --git a/include/linux/regulator/regulator-drv.h b/include/linux/regulator/regulator-drv.h new file mode 100644 index 0000000..3c9b398 --- /dev/null +++ b/include/linux/regulator/regulator-drv.h @@ -0,0 +1,119 @@ +/* + * regulator-drv.h -- SoC Regulator 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_DRV_H_ +#define __LINUX_REGULATOR_DRV_H_ + +#include +#include + +struct regulator_constraints; +struct regulator_cdev; + +/** + * struct regulator_ops - regulator operations. + * + * This struct describes regulator operations. + */ +struct regulator_ops { + + /* get/set regulator voltage */ + int (*set_voltage)(struct regulator_cdev *, int uV); + int (*get_voltage)(struct regulator_cdev *); + + /* get/set regulator current */ + int (*set_current)(struct regulator_cdev *, int uA); + int (*get_current)(struct regulator_cdev *); + + /* enable/disable regulator */ + int (*enable)(struct regulator_cdev *); + int (*disable)(struct regulator_cdev *); + int (*is_enabled)(struct regulator_cdev *); + + /* get/set regulator operating mode (defined in regulator.h) */ + int (*set_mode)(struct regulator_cdev *, unsigned int mode); + unsigned int (*get_mode)(struct regulator_cdev *); + + /* get most efficient regulator operating mode for load */ + unsigned int (*get_optimum_mode)(struct regulator_cdev *, int input_uV, + int output_uV, int load_uA); +}; + +/* + * Regulators can either control voltage or current. + */ +enum regulator_type { + REGULATOR_VOLTAGE, + REGULATOR_CURRENT, +}; + +/** + * struct regulator_desc - Regulator descriptor + * + */ +struct regulator_desc { + const char *name; + int id; + struct regulator_ops *ops; + int irq; + enum regulator_type type; + struct module *owner; +}; + +/** + * regulator_register - register regulator + * @regulator: regulator source + * @reg_data: private regulator data + * + * Called by regulator drivers to register a regulator. + * Returns 0 on success. + */ +struct regulator_cdev *regulator_register( + struct regulator_desc *regulator_desc, void *reg_data); + +/** + * regulator_unregister - unregister regulator + * @regulator: regulator source + * + * Called by regulator drivers to unregister a regulator. + */ +void regulator_unregister(struct regulator_cdev *rcdev); + +/** + * regulator_notifier_call_chain - call regulator event notifier + * @regulator: regulator source + * @event: notifier block + * @data: + * + * Called by regulator drivers to notify clients a regulator event has + * occurred. + */ +int regulator_notifier_call_chain(struct regulator_cdev *rcdev, + unsigned long event, void *data); + +/** + * regulator_get_drvdata - get regulator driver data + * @regulator: regulator + */ +void *rcdev_get_drvdata (struct regulator_cdev *rcdev); + +/** + * regulator_get_id - get regulator ID + * @regulator: regulator + */ +int rcdev_get_id (struct regulator_cdev *rcdev); + + +#endif diff --git a/include/linux/regulator/regulator-platform.h b/include/linux/regulator/regulator-platform.h new file mode 100644 index 0000000..5558630 --- /dev/null +++ b/include/linux/regulator/regulator-platform.h @@ -0,0 +1,104 @@ +/* + * regulator-platform.h -- SoC Regulator support, platform driver API. + * + * 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 Platform Interface. + */ + + +#ifndef __LINUX_REGULATOR_PLATFORM_H_ +#define __LINUX_REGULATOR_PLATFORM_H_ + +#include + +struct regulator; + +/* + * Regulator operation constraint flags. These flags are used to enable + * certain regulator operations. + * + * @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. + */ + +#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 + +/** + * struct regulation_constraints - regulator operating constraints. + * + * This struct describes regulator and board/machine specific constraints. + */ +struct regulation_constraints { + + char *name; + + /* voltage output range - for voltage control */ + int min_uV; + int max_uV; + + /* current output range - for current control */ + int min_uA; + int max_uA; + + /* valid regulator operating modes for this machine */ + unsigned int valid_modes_mask; + + /* valid operations for regulator on this machine */ + unsigned int valid_ops_mask; + + /* input voltage */ + int input_uV; +}; + +/** + * regulator_set_platform_source - set regulator source regulator + * @regulator: regulator source + * @parent: source or parent regulator + * + * Called by platform initialisation code to set the source supply or "parent" + * regulator for this regulator. This ensures that a regulator source will + * also be enabled by the core if it's child is enabled. + */ +int regulator_set_platform_source(const char *regulator_source, + const char *regulator_parent); + +/** + * regulator_get_platform_source - get regulator source regulator + * @regulator: regulator source + * + * Returns the regulator supply regulator or NULL if no supply regulator + * exists (i.e the regulator is supplied directly from USB, Line, Battery, etc) + */ +const char *regulator_get_platform_source(const char *regulator_name); + + +/** + * regulator_set_platform_constraints - sets regulator constraints + * @regulator: regulator source + * + * Allows platform initialisation code to define and constrain regulator + * circuits e.g. valid voltage/current ranges, etc. + * NOTE: Constraints *must* be set by platform code in order for some + * regulator operations to proceed i.e. set_voltage, set_current, set_mode. + */ +int regulator_set_platform_constraints(const char *regulator_name, + struct regulation_constraints *constraints); + +#endif