diff options
Diffstat (limited to 'drivers/regulator/core.c')
| -rw-r--r-- | drivers/regulator/core.c | 1903 |
1 files changed, 1903 insertions, 0 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c new file mode 100644 index 000000000000..9c7986261568 --- /dev/null +++ b/drivers/regulator/core.c @@ -0,0 +1,1903 @@ +/* + * core.c -- Voltage/Current Regulator framework. + * + * Copyright 2007, 2008 Wolfson Microelectronics PLC. + * + * Author: Liam Girdwood <liam.girdwood@wolfsonmicro.com> + * + * 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 <linux/kernel.h> +#include <linux/init.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/mutex.h> +#include <linux/suspend.h> +#include <linux/regulator/consumer.h> +#include <linux/regulator/driver.h> +#include <linux/regulator/machine.h> + +#define REGULATOR_VERSION "0.5" + +static DEFINE_MUTEX(regulator_list_mutex); +static LIST_HEAD(regulator_list); +static LIST_HEAD(regulator_map_list); + +/** + * struct regulator_dev + * + * Voltage / Current regulator class device. One for each regulator. + */ +struct regulator_dev { + struct regulator_desc *desc; + int use_count; + + /* lists we belong to */ + struct list_head list; /* list of all regulators */ + struct list_head slist; /* list of supplied regulators */ + + /* lists we own */ + struct list_head consumer_list; /* consumers we supply */ + struct list_head supply_list; /* regulators we supply */ + + struct blocking_notifier_head notifier; + struct mutex mutex; /* consumer lock */ + struct module *owner; + struct device dev; + struct regulation_constraints *constraints; + struct regulator_dev *supply; /* for tree */ + + void *reg_data; /* regulator_dev data */ +}; + +/** + * struct regulator_map + * + * Used to provide symbolic supply names to devices. + */ +struct regulator_map { + struct list_head list; + struct device *dev; + const char *supply; + const char *regulator; +}; + +static inline struct regulator_dev *to_rdev(struct device *d) +{ + return container_of(d, struct regulator_dev, dev); +} + +/* + * struct regulator + * + * One for each consumer device. + */ +struct regulator { + struct device *dev; + struct list_head list; + int uA_load; + int min_uV; + int max_uV; + int enabled; /* client has called enabled */ + char *supply_name; + struct device_attribute dev_attr; + struct regulator_dev *rdev; +}; + +static int _regulator_is_enabled(struct regulator_dev *rdev); +static int _regulator_disable(struct regulator_dev *rdev); +static int _regulator_get_voltage(struct regulator_dev *rdev); +static int _regulator_get_current_limit(struct regulator_dev *rdev); +static unsigned int _regulator_get_mode(struct regulator_dev *rdev); +static void _notifier_call_chain(struct regulator_dev *rdev, + unsigned long event, void *data); + +/* gets the regulator for a given consumer device */ +static struct regulator *get_device_regulator(struct device *dev) +{ + struct regulator *regulator = NULL; + struct regulator_dev *rdev; + + mutex_lock(®ulator_list_mutex); + list_for_each_entry(rdev, ®ulator_list, list) { + mutex_lock(&rdev->mutex); + list_for_each_entry(regulator, &rdev->consumer_list, list) { + if (regulator->dev == dev) { + mutex_unlock(&rdev->mutex); + mutex_unlock(®ulator_list_mutex); + return regulator; + } + } + mutex_unlock(&rdev->mutex); + } + mutex_unlock(®ulator_list_mutex); + return NULL; +} + +/* Platform voltage constraint check */ +static int regulator_check_voltage(struct regulator_dev *rdev, + int *min_uV, int *max_uV) +{ + BUG_ON(*min_uV > *max_uV); + + if (!rdev->constraints) { + printk(KERN_ERR "%s: no constraints for %s\n", __func__, + rdev->desc->name); + return -ENODEV; + } + if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { + printk(KERN_ERR "%s: operation not allowed for %s\n", + __func__, rdev->desc->name); + return -EPERM; + } + + if (*max_uV > rdev->constraints->max_uV) + *max_uV = rdev->constraints->max_uV; + if (*min_uV < rdev->constraints->min_uV) + *min_uV = rdev->constraints->min_uV; + + if (*min_uV > *max_uV) + return -EINVAL; + + return 0; +} + +/* current constraint check */ +static int regulator_check_current_limit(struct regulator_dev *rdev, + int *min_uA, int *max_uA) +{ + BUG_ON(*min_uA > *max_uA); + + if (!rdev->constraints) { + printk(KERN_ERR "%s: no constraints for %s\n", __func__, + rdev->desc->name); + return -ENODEV; + } + if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { + printk(KERN_ERR "%s: operation not allowed for %s\n", + __func__, rdev->desc->name); + return -EPERM; + } + + if (*max_uA > rdev->constraints->max_uA) + *max_uA = rdev->constraints->max_uA; + if (*min_uA < rdev->constraints->min_uA) + *min_uA = rdev->constraints->min_uA; + + if (*min_uA > *max_uA) + return -EINVAL; + + return 0; +} + +/* operating mode constraint check */ +static int regulator_check_mode(struct regulator_dev *rdev, int mode) +{ + if (!rdev->constraints) { + printk(KERN_ERR "%s: no constraints for %s\n", __func__, + rdev->desc->name); + return -ENODEV; + } + if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { + printk(KERN_ERR "%s: operation not allowed for %s\n", + __func__, rdev->desc->name); + return -EPERM; + } + if (!(rdev->constraints->valid_modes_mask & mode)) { + printk(KERN_ERR "%s: invalid mode %x for %s\n", + __func__, mode, rdev->desc->name); + return -EINVAL; + } + return 0; +} + +/* dynamic regulator mode switching constraint check */ +static int regulator_check_drms(struct regulator_dev *rdev) +{ + if (!rdev->constraints) { + printk(KERN_ERR "%s: no constraints for %s\n", __func__, + rdev->desc->name); + return -ENODEV; + } + if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { + printk(KERN_ERR "%s: operation not allowed for %s\n", + __func__, rdev->desc->name); + return -EPERM; + } + return 0; +} + +static ssize_t device_requested_uA_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct regulator *regulator; + + regulator = get_device_regulator(dev); + if (regulator == NULL) + return 0; + + return sprintf(buf, "%d\n", regulator->uA_load); +} + +static ssize_t regulator_uV_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct regulator_dev *rdev = to_rdev(dev); + ssize_t ret; + + mutex_lock(&rdev->mutex); + ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); + mutex_unlock(&rdev->mutex); + + return ret; +} + +static ssize_t regulator_uA_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct regulator_dev *rdev = to_rdev(dev); + + return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); +} + +static ssize_t regulator_opmode_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct regulator_dev *rdev = to_rdev(dev); + int mode = _regulator_get_mode(rdev); + + 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 device *dev, + struct device_attribute *attr, char *buf) +{ + struct regulator_dev *rdev = to_rdev(dev); + int state = _regulator_is_enabled(rdev); + + 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_min_uA_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct regulator_dev *rdev = to_rdev(dev); + + if (!rdev->constraints) + return sprintf(buf, "constraint not defined\n"); + + return sprintf(buf, "%d\n", rdev->constraints->min_uA); +} + +static ssize_t regulator_max_uA_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct regulator_dev *rdev = to_rdev(dev); + + if (!rdev->constraints) + return sprintf(buf, "constraint not defined\n"); + + return sprintf(buf, "%d\n", rdev->constraints->max_uA); +} + +static ssize_t regulator_min_uV_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct regulator_dev *rdev = to_rdev(dev); + + if (!rdev->constraints) + return sprintf(buf, "constraint not defined\n"); + + return sprintf(buf, "%d\n", rdev->constraints->min_uV); +} + +static ssize_t regulator_max_uV_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct regulator_dev *rdev = to_rdev(dev); + + if (!rdev->constraints) + return sprintf(buf, "constraint not defined\n"); + + return sprintf(buf, "%d\n", rdev->constraints->max_uV); +} + +static ssize_t regulator_total_uA_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct regulator_dev *rdev = to_rdev(dev); + struct regulator *regulator; + int uA = 0; + + mutex_lock(&rdev->mutex); + list_for_each_entry(regulator, &rdev->consumer_list, list) + uA += regulator->uA_load; + mutex_unlock(&rdev->mutex); + return sprintf(buf, "%d\n", uA); +} + +static ssize_t regulator_num_users_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct regulator_dev *rdev = to_rdev(dev); + return sprintf(buf, "%d\n", rdev->use_count); +} + +static ssize_t regulator_type_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct regulator_dev *rdev = to_rdev(dev); + + switch (rdev->desc->type) { + case REGULATOR_VOLTAGE: + return sprintf(buf, "voltage\n"); + case REGULATOR_CURRENT: + return sprintf(buf, "current\n"); + } + return sprintf(buf, "unknown\n"); +} + +static ssize_t regulator_suspend_mem_uV_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct regulator_dev *rdev = to_rdev(dev); + + if (!rdev->constraints) + return sprintf(buf, "not defined\n"); + return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); +} + +static ssize_t regulator_suspend_disk_uV_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct regulator_dev *rdev = to_rdev(dev); + + if (!rdev->constraints) + return sprintf(buf, "not defined\n"); + return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); +} + +static ssize_t regulator_suspend_standby_uV_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct regulator_dev *rdev = to_rdev(dev); + + if (!rdev->constraints) + return sprintf(buf, "not defined\n"); + return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); +} + +static ssize_t suspend_opmode_show(struct regulator_dev *rdev, + unsigned int mode, char *buf) +{ + 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_suspend_mem_mode_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct regulator_dev *rdev = to_rdev(dev); + + if (!rdev->constraints) + return sprintf(buf, "not defined\n"); + return suspend_opmode_show(rdev, + rdev->constraints->state_mem.mode, buf); +} + +static ssize_t regulator_suspend_disk_mode_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct regulator_dev *rdev = to_rdev(dev); + + if (!rdev->constraints) + return sprintf(buf, "not defined\n"); + return suspend_opmode_show(rdev, + rdev->constraints->state_disk.mode, buf); +} + +static ssize_t regulator_suspend_standby_mode_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct regulator_dev *rdev = to_rdev(dev); + + if (!rdev->constraints) + return sprintf(buf, "not defined\n"); + return suspend_opmode_show(rdev, + rdev->constraints->state_standby.mode, buf); +} + +static ssize_t regulator_suspend_mem_state_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct regulator_dev *rdev = to_rdev(dev); + + if (!rdev->constraints) + return sprintf(buf, "not defined\n"); + + if (rdev->constraints->state_mem.enabled) + return sprintf(buf, "enabled\n"); + else + return sprintf(buf, "disabled\n"); +} + +static ssize_t regulator_suspend_disk_state_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct regulator_dev *rdev = to_rdev(dev); + + if (!rdev->constraints) + return sprintf(buf, "not defined\n"); + + if (rdev->constraints->state_disk.enabled) + return sprintf(buf, "enabled\n"); + else + return sprintf(buf, "disabled\n"); +} + +static ssize_t regulator_suspend_standby_state_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct regulator_dev *rdev = to_rdev(dev); + + if (!rdev->constraints) + return sprintf(buf, "not defined\n"); + + if (rdev->constraints->state_standby.enabled) + return sprintf(buf, "enabled\n"); + else + return sprintf(buf, "disabled\n"); +} +static struct device_attribute regulator_dev_attrs[] = { + __ATTR(microvolts, 0444, regulator_uV_show, NULL), + __ATTR(microamps, 0444, regulator_uA_show, NULL), + __ATTR(opmode, 0444, regulator_opmode_show, NULL), + __ATTR(state, 0444, regulator_state_show, NULL), + __ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL), + __ATTR(min_microamps, 0444, regulator_min_uA_show, NULL), + __ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL), + __ATTR(max_microamps, 0444, regulator_max_uA_show, NULL), + __ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL), + __ATTR(num_users, 0444, regulator_num_users_show, NULL), + __ATTR(type, 0444, regulator_type_show, NULL), + __ATTR(suspend_mem_microvolts, 0444, + regulator_suspend_mem_uV_show, NULL), + __ATTR(suspend_disk_microvolts, 0444, + regulator_suspend_disk_uV_show, NULL), + __ATTR(suspend_standby_microvolts, 0444, + regulator_suspend_standby_uV_show, NULL), + __ATTR(suspend_mem_mode, 0444, + regulator_suspend_mem_mode_show, NULL), + __ATTR(suspend_disk_mode, 0444, + regulator_suspend_disk_mode_show, NULL), + __ATTR(suspend_standby_mode, 0444, + regulator_suspend_standby_mode_show, NULL), + __ATTR(suspend_mem_state, 0444, + regulator_suspend_mem_state_show, NULL), + __ATTR(suspend_disk_state, 0444, + regulator_suspend_disk_state_show, NULL), + __ATTR(suspend_standby_state, 0444, + regulator_suspend_standby_state_show, NULL), + __ATTR_NULL, +}; + +static void regulator_dev_release(struct device *dev) +{ + struct regulator_dev *rdev = to_rdev(dev); + kfree(rdev); +} + +static struct class regulator_class = { + .name = "regulator", + .dev_release = regulator_dev_release, + .dev_attrs = regulator_dev_attrs, +}; + +/* Calculate the new optimum regulator operating mode based on the new total + * consumer load. All locks held by caller */ +static void drms_uA_update(struct regulator_dev *rdev) +{ + struct regulator *sibling; + int current_uA = 0, output_uV, input_uV, err; + unsigned int mode; + + err = regulator_check_drms(rdev); + if (err < 0 || !rdev->desc->ops->get_optimum_mode || + !rdev->desc->ops->get_voltage || !rdev->desc->ops->set_mode); + return; + + /* get output voltage */ + output_uV = rdev->desc->ops->get_voltage(rdev); + if (output_uV <= 0) + return; + + /* get input voltage */ + if (rdev->supply && rdev->supply->desc->ops->get_voltage) + input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply); + else + input_uV = rdev->constraints->input_uV; + if (input_uV <= 0) + return; + + /* calc total requested load */ + list_for_each_entry(sibling, &rdev->consumer_list, list) + current_uA += sibling->uA_load; + + /* now get the optimum mode for our new total regulator load */ + mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, + output_uV, current_uA); + + /* check the new mode is allowed */ + err = regulator_check_mode(rdev, mode); + if (err == 0) + rdev->desc->ops->set_mode(rdev, mode); +} + +static int suspend_set_state(struct regulator_dev *rdev, + struct regulator_state *rstate) +{ + int ret = 0; + + /* enable & disable are mandatory for suspend control */ + if (!rdev->desc->ops->set_suspend_enable || + !rdev->desc->ops->set_suspend_disable) + return -EINVAL; + + if (rstate->enabled) + ret = rdev->desc->ops->set_suspend_enable(rdev); + else + ret = rdev->desc->ops->set_suspend_disable(rdev); + if (ret < 0) { + printk(KERN_ERR "%s: failed to enabled/disable\n", __func__); + return ret; + } + + if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { + ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); + if (ret < 0) { + printk(KERN_ERR "%s: failed to set voltage\n", + __func__); + return ret; + } + } + + if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { + ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); + if (ret < 0) { + printk(KERN_ERR "%s: failed to set mode\n", __func__); + return ret; + } + } + return ret; +} + +/* locks held by caller */ +static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) +{ + if (!rdev->constraints) + return -EINVAL; + + switch (state) { + case PM_SUSPEND_STANDBY: + return suspend_set_state(rdev, + &rdev->constraints->state_standby); + case PM_SUSPEND_MEM: + return suspend_set_state(rdev, + &rdev->constraints->state_mem); + case PM_SUSPEND_MAX: + return suspend_set_state(rdev, + &rdev->constraints->state_disk); + default: + return -EINVAL; + } +} + +static void print_constraints(struct regulator_dev *rdev) +{ + struct regulation_constraints *constraints = rdev->constraints; + char buf[80]; + int count; + + if (rdev->desc->type == REGULATOR_VOLTAGE) { + if (constraints->min_uV == constraints->max_uV) + count = sprintf(buf, "%d mV ", + constraints->min_uV / 1000); + else + count = sprintf(buf, "%d <--> %d mV ", + constraints->min_uV / 1000, + constraints->max_uV / 1000); + } else { + if (constraints->min_uA == constraints->max_uA) + count = sprintf(buf, "%d mA ", + constraints->min_uA / 1000); + else + count = sprintf(buf, "%d <--> %d mA ", + constraints->min_uA / 1000, + constraints->max_uA / 1000); + } + 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", rdev->desc->name, buf); +} + +#define REG_STR_SIZE 32 + +static struct regulator *create_regulator(struct regulator_dev *rdev, + struct device *dev, + const char *supply_name) +{ + struct regulator *regulator; + char buf[REG_STR_SIZE]; + int err, size; + + regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); + if (regulator == NULL) + return NULL; + + mutex_lock(&rdev->mutex); + regulator->rdev = rdev; + list_add(®ulator->list, &rdev->consumer_list); + + if (dev) { + /* create a 'requested_microamps_name' sysfs entry */ + size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s", + supply_name); + if (size >= REG_STR_SIZE) + goto overflow_err; + + regulator->dev = dev; + regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); + if (regulator->dev_attr.attr.name == NULL) + goto attr_name_err; + + regulator->dev_attr.attr.owner = THIS_MODULE; + regulator->dev_attr.attr.mode = 0444; + regulator->dev_attr.show = device_requested_uA_show; + err = device_create_file(dev, ®ulator->dev_attr); + if (err < 0) { + printk(KERN_WARNING "%s: could not add regulator_dev" + " load sysfs\n", __func__); + goto attr_name_err; + } + + /* also add a link to the device sysfs entry */ + size = scnprintf(buf, REG_STR_SIZE, "%s-%s", + dev->kobj.name, supply_name); + if (size >= REG_STR_SIZE) + goto attr_err; + + regulator->supply_name = kstrdup(buf, GFP_KERNEL); + if (regulator->supply_name == NULL) + goto attr_err; + + err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, + buf); + if (err) { + printk(KERN_WARNING + "%s: could not add device link %s err %d\n", + __func__, dev->kobj.name, err); + device_remove_file(dev, ®ulator->dev_attr); + goto link_name_err; + } + } + mutex_unlock(&rdev->mutex); + return regulator; +link_name_err: + kfree(regulator->supply_name); +attr_err: + device_remove_file(regulator->dev, ®ulator->dev_attr); +attr_name_err: + kfree(regulator->dev_attr.attr.name); +overflow_err: + list_del(®ulator->list); + kfree(regulator); + mutex_unlock(&rdev->mutex); + return NULL; +} + +/** + * regulator_get - lookup and obtain a reference to a regulator. + * @dev: device for regulator "consumer" + * @id: Supply name or regulator ID. + * + * Returns a struct regulator corresponding to the regulator producer, + * or IS_ERR() condition containing errno. Use of supply names + * configured via regulator_set_device_supply() is strongly + * encouraged. + */ +struct regulator *regulator_get(struct device *dev, const char *id) +{ + struct regulator_dev *rdev; + struct regulator_map *map; + struct regulator *regulator = ERR_PTR(-ENODEV); + const char *supply = id; + + if (id == NULL) { + printk(KERN_ERR "regulator: get() with no identifier\n"); + return regulator; + } + + mutex_lock(®ulator_list_mutex); + + list_for_each_entry(map, ®ulator_map_list, list) { + if (dev == map->dev && + strcmp(map->supply, id) == 0) { + supply = map->regulator; + break; + } + } + + list_for_each_entry(rdev, ®ulator_list, list) { + if (strcmp(supply, rdev->desc->name) == 0 && + try_module_get(rdev->owner)) + goto found; + } + printk(KERN_ERR "regulator: Unable to get requested regulator: %s\n", + id); + mutex_unlock(®ulator_list_mutex); + return regulator; + +found: + regulator = create_regulator(rdev, dev, id); + if (regulator == NULL) { + regulator = ERR_PTR(-ENOMEM); + module_put(rdev->owner); + } + + mutex_unlock(®ulator_list_mutex); + return regulator; +} +EXPORT_SYMBOL_GPL(regulator_get); + +/** + * 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) +{ + struct regulator_dev *rdev; + + if (regulator == NULL || IS_ERR(regulator)) + return; + + if (regulator->enabled) { + printk(KERN_WARNING "Releasing supply %s while enabled\n", + regulator->supply_name); + WARN_ON(regulator->enabled); + regulator_disable(regulator); + } + + mutex_lock(®ulator_list_mutex); + rdev = regulator->rdev; + + /* remove any sysfs entries */ + if (regulator->dev) { + sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); + kfree(regulator->supply_name); + device_remove_file(regulator->dev, ®ulator->dev_attr); + kfree(regulator->dev_attr.attr.name); + } + list_del(®ulator->list); + kfree(regulator); + + module_put(rdev->owner); + mutex_unlock(®ulator_list_mutex); +} +EXPORT_SYMBOL_GPL(regulator_put); + +/* locks held by regulator_enable() */ +static int _regulator_enable(struct regulator_dev *rdev) +{ + int ret = -EINVAL; + + if (!rdev->constraints) { + printk(KERN_ERR "%s: %s has no constraints\n", + __func__, rdev->desc->name); + return ret; + } + + /* do we need to enable the supply regulator first */ + if (rdev->supply) { + ret = _regulator_enable(rdev->supply); + if (ret < 0) { + printk(KERN_ERR "%s: failed to enable %s: %d\n", + __func__, rdev->desc->name, ret); + return ret; + } + } + + /* check voltage and requested load before enabling */ + if (rdev->desc->ops->enable) { + + if (rdev->constraints && + (rdev->constraints->valid_ops_mask & + REGULATOR_CHANGE_DRMS)) + drms_uA_update(rdev); + + ret = rdev->desc->ops->enable(rdev); + if (ret < 0) { + printk(KERN_ERR "%s: failed to enable %s: %d\n", + __func__, rdev->desc->name, ret); + return ret; + } + rdev->use_count++; + return ret; + } + + return ret; +} + +/** + * 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, boot loader or may be + * hardwired in the regulator. + * NOTE: calls to regulator_enable() must be balanced with calls to + * regulator_disable(). + */ +int regulator_enable(struct regulator *regulator) +{ + int ret; + + if (regulator->enabled) { + printk(KERN_CRIT "Regulator %s already enabled\n", + regulator->supply_name); + WARN_ON(regulator->enabled); + return 0; + } + + mutex_lock(®ulator->rdev->mutex); + regulator->enabled = 1; + ret = _regulator_enable(regulator->rdev); + if (ret != 0) + regulator->enabled = 0; + mutex_unlock(®ulator->rdev->mutex); + return ret; +} +EXPORT_SYMBOL_GPL(regulator_enable); + +/* locks held by regulator_disable() */ +static int _regulator_disable(struct regulator_dev *rdev) +{ + int ret = 0; + + /* are we the last user and permitted to disable ? */ + if (rdev->use_count == 1 && !rdev->constraints->always_on) { + + /* we are last user */ + if (rdev->desc->ops->disable) { + ret = rdev->desc->ops->disable(rdev); + if (ret < 0) { + printk(KERN_ERR "%s: failed to disable %s\n", + __func__, rdev->desc->name); + return ret; + } + } + + /* decrease our supplies ref count and disable if required */ + if (rdev->supply) + _regulator_disable(rdev->supply); + + rdev->use_count = 0; + } else if (rdev->use_count > 1) { + + if (rdev->constraints && + (rdev->constraints->valid_ops_mask & + REGULATOR_CHANGE_DRMS)) + drms_uA_update(rdev); + + rdev->use_count--; + } + return ret; +} + +/** + * regulator_disable - disable regulator output + * @regulator: regulator source + * + * Disable the regulator output voltage or current. + * NOTE: this will only disable the regulator output if no other consumer + * devices have it enabled. + * NOTE: calls to regulator_enable() must be balanced with calls to + * regulator_disable(). + */ +int regulator_disable(struct regulator *regulator) +{ + int ret; + + if (!regulator->enabled) { + printk(KERN_ERR "%s: not in use by this consumer\n", + __func__); + return 0; + } + + mutex_lock(®ulator->rdev->mutex); + regulator->enabled = 0; + regulator->uA_load = 0; + ret = _regulator_disable(regulator->rdev); + mutex_unlock(®ulator->rdev->mutex); + return ret; +} +EXPORT_SYMBOL_GPL(regulator_disable); + +/* locks held by regulator_force_disable() */ +static int _regulator_force_disable(struct regulator_dev *rdev) +{ + int ret = 0; + + /* force disable */ + if (rdev->desc->ops->disable) { + /* ah well, who wants to live forever... */ + ret = rdev->desc->ops->disable(rdev); + if (ret < 0) { + printk(KERN_ERR "%s: failed to force disable %s\n", + __func__, rdev->desc->name); + return ret; + } + /* notify other consumers that power has been forced off */ + _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE, + NULL); + } + + /* decrease our supplies ref count and disable if required */ + if (rdev->supply) + _regulator_disable(rdev->supply); + + rdev->use_count = 0; + return ret; +} + +/** + * regulator_force_disable - force disable regulator output + * @regulator: regulator source + * + * Forcibly disable the regulator output voltage or current. + * NOTE: this *will* disable the regulator output even if other consumer + * devices have it enabled. This should be used for situations when device + * damage will likely occur if the regulator is not disabled (e.g. over temp). + */ +int regulator_force_disable(struct regulator *regulator) +{ + int ret; + + mutex_lock(®ulator->rdev->mutex); + regulator->enabled = 0; + regulator->uA_load = 0; + ret = _regulator_force_disable(regulator->rdev); + mutex_unlock(®ulator->rdev->mutex); + return ret; +} +EXPORT_SYMBOL_GPL(regulator_force_disable); + +static int _regulator_is_enabled(struct regulator_dev *rdev) +{ + int ret; + + mutex_lock(&rdev->mutex); + + /* sanity check */ + if (!rdev->desc->ops->is_enabled) { + ret = -EINVAL; + goto out; + } + + ret = rdev->desc->ops->is_enabled(rdev); +out: + mutex_unlock(&rdev->mutex); + return ret; +} + +/** + * 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) +{ + return _regulator_is_enabled(regulator->rdev); +} +EXPORT_SYMBOL_GPL(regulator_is_enabled); + +/** + * regulator_set_voltage - set regulator output voltage + * @regulator: regulator source + * @min_uV: Minimum required voltage in uV + * @max_uV: Maximum acceptable 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 min_uV, int max_uV) +{ + struct regulator_dev *rdev = regulator->rdev; + int ret; + + mutex_lock(&rdev->mutex); + + /* sanity check */ + if (!rdev->desc->ops->set_voltage) { + ret = -EINVAL; + goto out; + } + + /* constraints check */ + ret = regulator_check_voltage(rdev, &min_uV, &max_uV); + if (ret < 0) + goto out; + regulator->min_uV = min_uV; + regulator->max_uV = max_uV; + ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV); + +out: + mutex_unlock(&rdev->mutex); + return ret; +} +EXPORT_SYMBOL_GPL(regulator_set_voltage); + +static int _regulator_get_voltage(struct regulator_dev *rdev) +{ + /* sanity check */ + if (rdev->desc->ops->get_voltage) + return rdev->desc->ops->get_voltage(rdev); + else + return -EINVAL; +} + +/** + * 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) +{ + int ret; + + mutex_lock(®ulator->rdev->mutex); + + ret = _regulator_get_voltage(regulator->rdev); + + mutex_unlock(®ulator->rdev->mutex); + + return ret; +} +EXPORT_SYMBOL_GPL(regulator_get_voltage); + +/** + * regulator_set_current_limit - set regulator output current limit + * @regulator: regulator source + * @min_uA: Minimuum supported current in uA + * @max_uA: Maximum supported 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_limit(struct regulator *regulator, + int min_uA, int max_uA) +{ + struct regulator_dev *rdev = regulator->rdev; + int ret; + + mutex_lock(&rdev->mutex); + + /* sanity check */ + if (!rdev->desc->ops->set_current_limit) { + ret = -EINVAL; + goto out; + } + + /* constraints check */ + ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); + if (ret < 0) + goto out; + + ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); +out: + mutex_unlock(&rdev->mutex); + return ret; +} +EXPORT_SYMBOL_GPL(regulator_set_current_limit); + +static int _regulator_get_current_limit(struct regulator_dev *rdev) +{ + int ret; + + mutex_lock(&rdev->mutex); + + /* sanity check */ + if (!rdev->desc->ops->get_current_limit) { + ret = -EINVAL; + goto out; + } + + ret = rdev->desc->ops->get_current_limit(rdev); +out: + mutex_unlock(&rdev->mutex); + return ret; +} + +/** + * regulator_get_current_limit - 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_limit(struct regulator *regulator) +{ + return _regulator_get_current_limit(regulator->rdev); +} +EXPORT_SYMBOL_GPL(regulator_get_current_limit); + +/** + * 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) +{ + struct regulator_dev *rdev = regulator->rdev; + int ret; + + mutex_lock(&rdev->mutex); + + /* sanity check */ + if (!rdev->desc->ops->set_mode) { + ret = -EINVAL; + goto out; + } + + /* constraints check */ + ret = regulator_check_mode(rdev, mode); + if (ret < 0) + goto out; + + ret = rdev->desc->ops->set_mode(rdev, mode); +out: + mutex_unlock(&rdev->mutex); + return ret; +} +EXPORT_SYMBOL_GPL(regulator_set_mode); + +static unsigned int _regulator_get_mode(struct regulator_dev *rdev) +{ + int ret; + + mutex_lock(&rdev->mutex); + + /* sanity check */ + if (!rdev->desc->ops->get_mode) { + ret = -EINVAL; + goto out; + } + + ret = rdev->desc->ops->get_mode(rdev); +out: + mutex_unlock(&rdev->mutex); + return ret; +} + +/** + * regulator_get_mode - get regulator operating mode + * @regulator: regulator source + * + * Get the current regulator operating mode. + */ +unsigned int regulator_get_mode(struct regulator *regulator) +{ + return _regulator_get_mode(regulator->rdev); +} +EXPORT_SYMBOL_GPL(regulator_get_mode); + +/** + * regulator_set_optimum_mode - set regulator optimum operating mode + * @regulator: regulator source + * @uA_load: load current + * + * Notifies the regulator core of a new device load. This is then used by + * DRMS (if enabled by constraints) to set the most efficient regulator + * operating mode for the new regulator loading. + * + * Consumer 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 will sum the total requested load on the regulator and change + * to the most efficient operating mode if platform constraints allow. + * + * Returns the new regulator mode or error. + */ +int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) +{ + struct regulator_dev *rdev = regulator->rdev; + struct regulator *consumer; + int ret, output_uV, input_uV, total_uA_load = 0; + unsigned int mode; + + mutex_lock(&rdev->mutex); + + regulator->uA_load = uA_load; + ret = regulator_check_drms(rdev); + if (ret < 0) + goto out; + ret = -EINVAL; + + /* sanity check */ + if (!rdev->desc->ops->get_optimum_mode) + goto out; + + /* get output voltage */ + output_uV = rdev->desc->ops->get_voltage(rdev); + if (output_uV <= 0) { + printk(KERN_ERR "%s: invalid output voltage found for %s\n", + __func__, rdev->desc->name); + goto out; + } + + /* get input voltage */ + if (rdev->supply && rdev->supply->desc->ops->get_voltage) + input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply); + else + input_uV = rdev->constraints->input_uV; + if (input_uV <= 0) { + printk(KERN_ERR "%s: invalid input voltage found for %s\n", + __func__, rdev->desc->name); + goto out; + } + + /* calc total requested load for this regulator */ + list_for_each_entry(consumer, &rdev->consumer_list, list) + total_uA_load += consumer->uA_load; + + mode = rdev->desc->ops->get_optimum_mode(rdev, + input_uV, output_uV, + total_uA_load); + if (ret <= 0) { + printk(KERN_ERR "%s: failed to get optimum mode for %s @" + " %d uA %d -> %d uV\n", __func__, rdev->desc->name, + total_uA_load, input_uV, output_uV); + goto out; + } + + ret = rdev->desc->ops->set_mode(rdev, mode); + if (ret <= 0) { + printk(KERN_ERR "%s: failed to set optimum mode %x for %s\n", + __func__, mode, rdev->desc->name); + goto out; + } + ret = mode; +out: + mutex_unlock(&rdev->mutex); + return ret; +} +EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); + +/** + * regulator_register_notifier - register regulator event notifier + * @regulator: regulator source + * @notifier_block: notifier block + * + * Register notifier block to receive regulator events. + */ +int regulator_register_notifier(struct regulator *regulator, + struct notifier_block *nb) +{ + return blocking_notifier_chain_register(®ulator->rdev->notifier, + nb); +} +EXPORT_SYMBOL_GPL(regulator_register_notifier); + +/** + * regulator_unregister_notifier - unregister regulator event notifier + * @regulator: regulator source + * @notifier_block: notifier block + * + * Unregister regulator event notifier block. + */ +int regulator_unregister_notifier(struct regulator *regulator, + struct notifier_block *nb) +{ + return blocking_notifier_chain_unregister(®ulator->rdev->notifier, + nb); +} +EXPORT_SYMBOL_GPL(regulator_unregister_notifier); + +/* notify regulator consumers and downstream regulator consumers */ +static void _notifier_call_chain(struct regulator_dev *rdev, + unsigned long event, void *data) +{ + struct regulator_dev *_rdev; + + /* call rdev chain first */ + mutex_lock(&rdev->mutex); + blocking_notifier_call_chain(&rdev->notifier, event, NULL); + mutex_unlock(&rdev->mutex); + + /* now notify regulator we supply */ + list_for_each_entry(_rdev, &rdev->supply_list, slist) + _notifier_call_chain(_rdev, event, data); +} + +/** + * regulator_bulk_get - get multiple regulator consumers + * + * @dev: Device to supply + * @num_consumers: Number of consumers to register + * @consumers: Configuration of consumers; clients are stored here. + * + * @return 0 on success, an errno on failure. + * + * This helper function allows drivers to get several regulator + * consumers in one operation. If any of the regulators cannot be + * acquired then any regulators that were allocated will be freed + * before returning to the caller. + */ +int regulator_bulk_get(struct device *dev, int num_consumers, + struct regulator_bulk_data *consumers) +{ + int i; + int ret; + + for (i = 0; i < num_consumers; i++) + consumers[i].consumer = NULL; + + for (i = 0; i < num_consumers; i++) { + consumers[i].consumer = regulator_get(dev, + consumers[i].supply); + if (IS_ERR(consumers[i].consumer)) { + dev_err(dev, "Failed to get supply '%s'\n", + consumers[i].supply); + ret = PTR_ERR(consumers[i].consumer); + consumers[i].consumer = NULL; + goto err; + } + } + + return 0; + +err: + for (i = 0; i < num_consumers && consumers[i].consumer; i++) + regulator_put(consumers[i].consumer); + + return ret; +} +EXPORT_SYMBOL_GPL(regulator_bulk_get); + +/** + * regulator_bulk_enable - enable multiple regulator consumers + * + * @num_consumers: Number of consumers + * @consumers: Consumer data; clients are stored here. + * @return 0 on success, an errno on failure + * + * This convenience API allows consumers to enable multiple regulator + * clients in a single API call. If any consumers cannot be enabled + * then any others that were enabled will be disabled again prior to + * return. + */ +int regulator_bulk_enable(int num_consumers, + struct regulator_bulk_data *consumers) +{ + int i; + int ret; + + for (i = 0; i < num_consumers; i++) { + ret = regulator_enable(consumers[i].consumer); + if (ret != 0) + goto err; + } + + return 0; + +err: + printk(KERN_ERR "Failed to enable %s\n", consumers[i].supply); + for (i = 0; i < num_consumers; i++) + regulator_disable(consumers[i].consumer); + + return ret; +} +EXPORT_SYMBOL_GPL(regulator_bulk_enable); + +/** + * regulator_bulk_disable - disable multiple regulator consumers + * + * @num_consumers: Number of consumers + * @consumers: Consumer data; clients are stored here. + * @return 0 on success, an errno on failure + * + * This convenience API allows consumers to disable multiple regulator + * clients in a single API call. If any consumers cannot be enabled + * then any others that were disabled will be disabled again prior to + * return. + */ +int regulator_bulk_disable(int num_consumers, + struct regulator_bulk_data *consumers) +{ + int i; + int ret; + + for (i = 0; i < num_consumers; i++) { + ret = regulator_disable(consumers[i].consumer); + if (ret != 0) + goto err; + } + + return 0; + +err: + printk(KERN_ERR "Failed to disable %s\n", consumers[i].supply); + for (i = 0; i < num_consumers; i++) + regulator_enable(consumers[i].consumer); + + return ret; +} +EXPORT_SYMBOL_GPL(regulator_bulk_disable); + +/** + * regulator_bulk_free - free multiple regulator consumers + * + * @num_consumers: Number of consumers + * @consumers: Consumer data; clients are stored here. + * + * This convenience API allows consumers to free multiple regulator + * clients in a single API call. + */ +void regulator_bulk_free(int num_consumers, + struct regulator_bulk_data *consumers) +{ + int i; + + for (i = 0; i < num_consumers; i++) { + regulator_put(consumers[i].consumer); + consumers[i].consumer = NULL; + } +} +EXPORT_SYMBOL_GPL(regulator_bulk_free); + +/** + * 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. We also notify regulator clients downstream. + */ +int regulator_notifier_call_chain(struct regulator_dev *rdev, + unsigned long event, void *data) +{ + _notifier_call_chain(rdev, event, data); + return NOTIFY_DONE; + +} +EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); + +/** + * 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_dev *regulator_register(struct regulator_desc *regulator_desc, + void *reg_data) +{ + static atomic_t regulator_no = ATOMIC_INIT(0); + struct regulator_dev *rdev; + 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); + + rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); + if (rdev == NULL) + return ERR_PTR(-ENOMEM); + + mutex_lock(®ulator_list_mutex); + + mutex_init(&rdev->mutex); + rdev->reg_data = reg_data; + rdev->owner = regulator_desc->owner; + rdev->desc = regulator_desc; + INIT_LIST_HEAD(&rdev->consumer_list); + INIT_LIST_HEAD(&rdev->supply_list); + INIT_LIST_HEAD(&rdev->list); + INIT_LIST_HEAD(&rdev->slist); + BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); + + rdev->dev.class = ®ulator_class; + device_initialize(&rdev->dev); + snprintf(rdev->dev.bus_id, sizeof(rdev->dev.bus_id), + "regulator_%ld_%s", + (unsigned long)atomic_inc_return(®ulator_no) - 1, + regulator_desc->name); + + ret = device_add(&rdev->dev); + if (ret == 0) + list_add(&rdev->list, ®ulator_list); + else { + kfree(rdev); + rdev = ERR_PTR(ret); + } + mutex_unlock(®ulator_list_mutex); + return rdev; +} +EXPORT_SYMBOL_GPL(regulator_register); + +/** + * regulator_unregister - unregister regulator + * @regulator: regulator source + * + * Called by regulator drivers to unregister a regulator. + */ +void regulator_unregister(struct regulator_dev *rdev) +{ + if (rdev == NULL) + return; + + mutex_lock(®ulator_list_mutex); + list_del(&rdev->list); + if (rdev->supply) + sysfs_remove_link(&rdev->dev.kobj, "supply"); + device_unregister(&rdev->dev); + mutex_unlock(®ulator_list_mutex); +} +EXPORT_SYMBOL_GPL(regulator_unregister); + +/** + * regulator_set_supply - set regulator supply regulator + * @regulator: regulator name + * @supply: supply regulator name + * + * Called by platform initialisation code to set the supply regulator for this + * regulator. This ensures that a regulators supply will also be enabled by the + * core if it's child is enabled. + */ +int regulator_set_supply(const char *regulator, const char *supply) +{ + struct regulator_dev *rdev, *supply_rdev; + int err; + + if (regulator == NULL || supply == NULL) + return -EINVAL; + + mutex_lock(®ulator_list_mutex); + + list_for_each_entry(rdev, ®ulator_list, list) { + if (!strcmp(rdev->desc->name, regulator)) + goto found_regulator; + } + mutex_unlock(®ulator_list_mutex); + return -ENODEV; + +found_regulator: + list_for_each_entry(supply_rdev, ®ulator_list, list) { + if (!strcmp(supply_rdev->desc->name, supply)) + goto found_supply; + } + mutex_unlock(®ulator_list_mutex); + return -ENODEV; + +found_supply: + err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj, + "supply"); + if (err) { + printk(KERN_ERR + "%s: could not add device link %s err %d\n", + __func__, supply_rdev->dev.kobj.name, err); + goto out; + } + rdev->supply = supply_rdev; + list_add(&rdev->slist, &supply_rdev->supply_list); +out: + mutex_unlock(®ulator_list_mutex); + return err; +} +EXPORT_SYMBOL_GPL(regulator_set_supply); + +/** + * regulator_get_supply - get regulator supply regulator + * @regulator: regulator name + * + * Returns the supply supply regulator name or NULL if no supply regulator + * exists (i.e the regulator is supplied directly from USB, Line, Battery, etc) + */ +const char *regulator_get_supply(const char *regulator) +{ + struct regulator_dev *rdev; + + if (regulator == NULL) + return NULL; + + mutex_lock(®ulator_list_mutex); + list_for_each_entry(rdev, ®ulator_list, list) { + if (!strcmp(rdev->desc->name, regulator)) + goto found; + } + mutex_unlock(®ulator_list_mutex); + return NULL; + +found: + mutex_unlock(®ulator_list_mutex); + if (rdev->supply) + return rdev->supply->desc->name; + else + return NULL; +} +EXPORT_SYMBOL_GPL(regulator_get_supply); + +/** + * regulator_set_machine_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_limit, + * set_mode. + */ +int regulator_set_machine_constraints(const char *regulator_name, + struct regulation_constraints *constraints) +{ + struct regulator_dev *rdev; + int ret = 0; + + if (regulator_name == NULL) + return -EINVAL; + + mutex_lock(®ulator_list_mutex); + + list_for_each_entry(rdev, ®ulator_list, list) { + if (!strcmp(regulator_name, rdev->desc->name)) + goto found; + } + ret = -ENODEV; + goto out; + +found: + mutex_lock(&rdev->mutex); + rdev->constraints = constraints; + + /* do we need to apply the constraint voltage */ + if (rdev->constraints->apply_uV && + rdev->constraints->min_uV == rdev->constraints->max_uV && + rdev->desc->ops->set_voltage) { + ret = rdev->desc->ops->set_voltage(rdev, + rdev->constraints->min_uV, rdev->constraints->max_uV); + if (ret < 0) { + printk(KERN_ERR "%s: failed to apply %duV" + " constraint\n", __func__, + rdev->constraints->min_uV); + rdev->constraints = NULL; + goto out; + } + } + + /* are we enabled at boot time by firmware / bootloader */ + if (rdev->constraints->boot_on) + rdev->use_count = 1; + + /* do we need to setup our suspend state */ + if (constraints->initial_state) + ret = suspend_prepare(rdev, constraints->initial_state); + + print_constraints(rdev); + mutex_unlock(&rdev->mutex); + +out: + mutex_unlock(®ulator_list_mutex); + return ret; +} +EXPORT_SYMBOL_GPL(regulator_set_machine_constraints); + + +/** + * regulator_set_device_supply: Bind a regulator to a symbolic supply + * @regulator: regulator source + * @dev: device the supply applies to + * @supply: symbolic name for supply + * + * Allows platform initialisation code to map physical regulator + * sources to symbolic names for supplies for use by devices. Devices + * should use these symbolic names to request regulators, avoiding the + * need to provide board-specific regulator names as platform data. + */ +int regulator_set_device_supply(const char *regulator, struct device *dev, + const char *supply) +{ + struct regulator_map *node; + + if (regulator == NULL || supply == NULL) + return -EINVAL; + + node = kmalloc(sizeof(struct regulator_map), GFP_KERNEL); + if (node == NULL) + return -ENOMEM; + + node->regulator = regulator; + node->dev = dev; + node->supply = supply; + + mutex_lock(®ulator_list_mutex); + list_add(&node->list, ®ulator_map_list); + mutex_unlock(®ulator_list_mutex); + return 0; +} +EXPORT_SYMBOL_GPL(regulator_set_device_supply); + +/** + * regulator_suspend_prepare: prepare regulators for system wide suspend + * @state: system suspend state + * + * Configure each regulator with it's suspend operating parameters for state. + * This will usually be called by machine suspend code prior to supending. + */ +int regulator_suspend_prepare(suspend_state_t state) +{ + struct regulator_dev *rdev; + int ret = 0; + + /* ON is handled by regulator active state */ + if (state == PM_SUSPEND_ON) + return -EINVAL; + + mutex_lock(®ulator_list_mutex); + list_for_each_entry(rdev, ®ulator_list, list) { + + mutex_lock(&rdev->mutex); + ret = suspend_prepare(rdev, state); + mutex_unlock(&rdev->mutex); + + if (ret < 0) { + printk(KERN_ERR "%s: failed to prepare %s\n", + __func__, rdev->desc->name); + goto out; + } + } +out: + mutex_unlock(®ulator_list_mutex); + return ret; +} +EXPORT_SYMBOL_GPL(regulator_suspend_prepare); + +/** + * rdev_get_drvdata - get rdev regulator driver data + * @regulator: regulator + * + * Get rdev regulator driver private data. This call can be used in the + * regulator driver context. + */ +void *rdev_get_drvdata(struct regulator_dev *rdev) +{ + return rdev->reg_data; +} +EXPORT_SYMBOL_GPL(rdev_get_drvdata); + +/** + * regulator_get_drvdata - get regulator driver data + * @regulator: regulator + * + * Get regulator driver private data. This call can be used in the consumer + * driver context when non API regulator specific functions need to be called. + */ +void *regulator_get_drvdata(struct regulator *regulator) +{ + return regulator->rdev->reg_data; +} +EXPORT_SYMBOL_GPL(regulator_get_drvdata); + +/** + * regulator_set_drvdata - set regulator driver data + * @regulator: regulator + * @data: data + */ +void regulator_set_drvdata(struct regulator *regulator, void *data) +{ + regulator->rdev->reg_data = data; +} +EXPORT_SYMBOL_GPL(regulator_set_drvdata); + +/** + * regulator_get_id - get regulator ID + * @regulator: regulator + */ +int rdev_get_id(struct regulator_dev *rdev) +{ + return rdev->desc->id; +} +EXPORT_SYMBOL_GPL(rdev_get_id); + +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); |