/drivers/regulator/core.c
https://bitbucket.org/wisechild/galaxy-nexus · C · 2961 lines · 1949 code · 426 blank · 586 comment · 401 complexity · 2b3d507c313a74f8f6669437141af36c MD5 · raw file
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- /*
- * core.c -- Voltage/Current Regulator framework.
- *
- * Copyright 2007, 2008 Wolfson Microelectronics PLC.
- * Copyright 2008 SlimLogic Ltd.
- *
- * Author: Liam Girdwood <lrg@slimlogic.co.uk>
- *
- * 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.
- *
- */
- #define pr_fmt(fmt) "%s: " fmt, __func__
- #include <linux/kernel.h>
- #include <linux/init.h>
- #include <linux/debugfs.h>
- #include <linux/device.h>
- #include <linux/slab.h>
- #include <linux/err.h>
- #include <linux/mutex.h>
- #include <linux/suspend.h>
- #include <linux/delay.h>
- #include <linux/regulator/consumer.h>
- #include <linux/regulator/driver.h>
- #include <linux/regulator/machine.h>
- #define CREATE_TRACE_POINTS
- #include <trace/events/regulator.h>
- #include "dummy.h"
- #define rdev_err(rdev, fmt, ...) \
- pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
- #define rdev_warn(rdev, fmt, ...) \
- pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
- #define rdev_info(rdev, fmt, ...) \
- pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
- #define rdev_dbg(rdev, fmt, ...) \
- pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
- static DEFINE_MUTEX(regulator_list_mutex);
- static LIST_HEAD(regulator_list);
- static LIST_HEAD(regulator_map_list);
- static bool has_full_constraints;
- static bool board_wants_dummy_regulator;
- #ifdef CONFIG_DEBUG_FS
- static struct dentry *debugfs_root;
- #endif
- /*
- * struct regulator_map
- *
- * Used to provide symbolic supply names to devices.
- */
- struct regulator_map {
- struct list_head list;
- const char *dev_name; /* The dev_name() for the consumer */
- const char *supply;
- struct regulator_dev *regulator;
- };
- /*
- * 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;
- 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,
- struct regulator_dev **supply_rdev_ptr);
- 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);
- static int _regulator_do_set_voltage(struct regulator_dev *rdev,
- int min_uV, int max_uV);
- static const char *rdev_get_name(struct regulator_dev *rdev)
- {
- if (rdev->constraints && rdev->constraints->name)
- return rdev->constraints->name;
- else if (rdev->desc->name)
- return rdev->desc->name;
- else
- return "";
- }
- /* 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) {
- rdev_err(rdev, "no constraints\n");
- return -ENODEV;
- }
- if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
- rdev_err(rdev, "operation not allowed\n");
- 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;
- }
- /* Make sure we select a voltage that suits the needs of all
- * regulator consumers
- */
- static int regulator_check_consumers(struct regulator_dev *rdev,
- int *min_uV, int *max_uV)
- {
- struct regulator *regulator;
- list_for_each_entry(regulator, &rdev->consumer_list, list) {
- /*
- * Assume consumers that didn't say anything are OK
- * with anything in the constraint range.
- */
- if (!regulator->min_uV && !regulator->max_uV)
- continue;
- if (*max_uV > regulator->max_uV)
- *max_uV = regulator->max_uV;
- if (*min_uV < regulator->min_uV)
- *min_uV = regulator->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) {
- rdev_err(rdev, "no constraints\n");
- return -ENODEV;
- }
- if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
- rdev_err(rdev, "operation not allowed\n");
- 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_mode_constrain(struct regulator_dev *rdev, int *mode)
- {
- switch (*mode) {
- case REGULATOR_MODE_FAST:
- case REGULATOR_MODE_NORMAL:
- case REGULATOR_MODE_IDLE:
- case REGULATOR_MODE_STANDBY:
- break;
- default:
- return -EINVAL;
- }
- if (!rdev->constraints) {
- rdev_err(rdev, "no constraints\n");
- return -ENODEV;
- }
- if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
- rdev_err(rdev, "operation not allowed\n");
- return -EPERM;
- }
- /* The modes are bitmasks, the most power hungry modes having
- * the lowest values. If the requested mode isn't supported
- * try higher modes. */
- while (*mode) {
- if (rdev->constraints->valid_modes_mask & *mode)
- return 0;
- *mode /= 2;
- }
- return -EINVAL;
- }
- /* dynamic regulator mode switching constraint check */
- static int regulator_check_drms(struct regulator_dev *rdev)
- {
- if (!rdev->constraints) {
- rdev_err(rdev, "no constraints\n");
- return -ENODEV;
- }
- if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
- rdev_err(rdev, "operation not allowed\n");
- 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 = dev_get_drvdata(dev);
- ssize_t ret;
- mutex_lock(&rdev->mutex);
- ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
- mutex_unlock(&rdev->mutex);
- return ret;
- }
- static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
- static ssize_t regulator_uA_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
- }
- static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
- static ssize_t regulator_name_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- return sprintf(buf, "%s\n", rdev_get_name(rdev));
- }
- static ssize_t regulator_print_opmode(char *buf, int mode)
- {
- 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_opmode_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- return regulator_print_opmode(buf, _regulator_get_mode(rdev));
- }
- static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
- static ssize_t regulator_print_state(char *buf, int state)
- {
- 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_state_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- ssize_t ret;
- mutex_lock(&rdev->mutex);
- ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
- mutex_unlock(&rdev->mutex);
- return ret;
- }
- static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
- static ssize_t regulator_status_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- int status;
- char *label;
- status = rdev->desc->ops->get_status(rdev);
- if (status < 0)
- return status;
- switch (status) {
- case REGULATOR_STATUS_OFF:
- label = "off";
- break;
- case REGULATOR_STATUS_ON:
- label = "on";
- break;
- case REGULATOR_STATUS_ERROR:
- label = "error";
- break;
- case REGULATOR_STATUS_FAST:
- label = "fast";
- break;
- case REGULATOR_STATUS_NORMAL:
- label = "normal";
- break;
- case REGULATOR_STATUS_IDLE:
- label = "idle";
- break;
- case REGULATOR_STATUS_STANDBY:
- label = "standby";
- break;
- default:
- return -ERANGE;
- }
- return sprintf(buf, "%s\n", label);
- }
- static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
- static ssize_t regulator_min_uA_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- if (!rdev->constraints)
- return sprintf(buf, "constraint not defined\n");
- return sprintf(buf, "%d\n", rdev->constraints->min_uA);
- }
- static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
- static ssize_t regulator_max_uA_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- if (!rdev->constraints)
- return sprintf(buf, "constraint not defined\n");
- return sprintf(buf, "%d\n", rdev->constraints->max_uA);
- }
- static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
- static ssize_t regulator_min_uV_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- if (!rdev->constraints)
- return sprintf(buf, "constraint not defined\n");
- return sprintf(buf, "%d\n", rdev->constraints->min_uV);
- }
- static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
- static ssize_t regulator_max_uV_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- if (!rdev->constraints)
- return sprintf(buf, "constraint not defined\n");
- return sprintf(buf, "%d\n", rdev->constraints->max_uV);
- }
- static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
- static ssize_t regulator_total_uA_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(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 DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
- static ssize_t regulator_num_users_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(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 = dev_get_drvdata(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 = dev_get_drvdata(dev);
- return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
- }
- static DEVICE_ATTR(suspend_mem_microvolts, 0444,
- regulator_suspend_mem_uV_show, NULL);
- static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
- }
- static DEVICE_ATTR(suspend_disk_microvolts, 0444,
- regulator_suspend_disk_uV_show, NULL);
- static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
- }
- static DEVICE_ATTR(suspend_standby_microvolts, 0444,
- regulator_suspend_standby_uV_show, NULL);
- static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- return regulator_print_opmode(buf,
- rdev->constraints->state_mem.mode);
- }
- static DEVICE_ATTR(suspend_mem_mode, 0444,
- regulator_suspend_mem_mode_show, NULL);
- static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- return regulator_print_opmode(buf,
- rdev->constraints->state_disk.mode);
- }
- static DEVICE_ATTR(suspend_disk_mode, 0444,
- regulator_suspend_disk_mode_show, NULL);
- static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- return regulator_print_opmode(buf,
- rdev->constraints->state_standby.mode);
- }
- static DEVICE_ATTR(suspend_standby_mode, 0444,
- regulator_suspend_standby_mode_show, NULL);
- static ssize_t regulator_suspend_mem_state_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- return regulator_print_state(buf,
- rdev->constraints->state_mem.enabled);
- }
- static DEVICE_ATTR(suspend_mem_state, 0444,
- regulator_suspend_mem_state_show, NULL);
- static ssize_t regulator_suspend_disk_state_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- return regulator_print_state(buf,
- rdev->constraints->state_disk.enabled);
- }
- static DEVICE_ATTR(suspend_disk_state, 0444,
- regulator_suspend_disk_state_show, NULL);
- static ssize_t regulator_suspend_standby_state_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- return regulator_print_state(buf,
- rdev->constraints->state_standby.enabled);
- }
- static DEVICE_ATTR(suspend_standby_state, 0444,
- regulator_suspend_standby_state_show, NULL);
- /*
- * These are the only attributes are present for all regulators.
- * Other attributes are a function of regulator functionality.
- */
- static struct device_attribute regulator_dev_attrs[] = {
- __ATTR(name, 0444, regulator_name_show, NULL),
- __ATTR(num_users, 0444, regulator_num_users_show, NULL),
- __ATTR(type, 0444, regulator_type_show, NULL),
- __ATTR_NULL,
- };
- static void regulator_dev_release(struct device *dev)
- {
- struct regulator_dev *rdev = dev_get_drvdata(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->get_voltage_sel) ||
- !rdev->desc->ops->set_mode)
- return;
- /* get output voltage */
- output_uV = _regulator_get_voltage(rdev);
- if (output_uV <= 0)
- return;
- /* get input voltage */
- input_uV = 0;
- if (rdev->supply)
- input_uV = _regulator_get_voltage(rdev);
- if (input_uV <= 0)
- 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_mode_constrain(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;
- bool can_set_state;
- can_set_state = rdev->desc->ops->set_suspend_enable &&
- rdev->desc->ops->set_suspend_disable;
- /* If we have no suspend mode configration don't set anything;
- * only warn if the driver actually makes the suspend mode
- * configurable.
- */
- if (!rstate->enabled && !rstate->disabled) {
- if (can_set_state)
- rdev_warn(rdev, "No configuration\n");
- return 0;
- }
- if (rstate->enabled && rstate->disabled) {
- rdev_err(rdev, "invalid configuration\n");
- return -EINVAL;
- }
- if (!can_set_state) {
- rdev_err(rdev, "no way to set suspend state\n");
- 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) {
- rdev_err(rdev, "failed to enabled/disable\n");
- 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) {
- rdev_err(rdev, "failed to set voltage\n");
- 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) {
- rdev_err(rdev, "failed to set mode\n");
- 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 = 0;
- int ret;
- if (constraints->min_uV && constraints->max_uV) {
- if (constraints->min_uV == constraints->max_uV)
- count += sprintf(buf + count, "%d mV ",
- constraints->min_uV / 1000);
- else
- count += sprintf(buf + count, "%d <--> %d mV ",
- constraints->min_uV / 1000,
- constraints->max_uV / 1000);
- }
- if (!constraints->min_uV ||
- constraints->min_uV != constraints->max_uV) {
- ret = _regulator_get_voltage(rdev);
- if (ret > 0)
- count += sprintf(buf + count, "at %d mV ", ret / 1000);
- }
- if (constraints->uV_offset)
- count += sprintf(buf, "%dmV offset ",
- constraints->uV_offset / 1000);
- if (constraints->min_uA && constraints->max_uA) {
- if (constraints->min_uA == constraints->max_uA)
- count += sprintf(buf + count, "%d mA ",
- constraints->min_uA / 1000);
- else
- count += sprintf(buf + count, "%d <--> %d mA ",
- constraints->min_uA / 1000,
- constraints->max_uA / 1000);
- }
- if (!constraints->min_uA ||
- constraints->min_uA != constraints->max_uA) {
- ret = _regulator_get_current_limit(rdev);
- if (ret > 0)
- count += sprintf(buf + count, "at %d mA ", ret / 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");
- rdev_info(rdev, "%s\n", buf);
- }
- static int machine_constraints_voltage(struct regulator_dev *rdev,
- struct regulation_constraints *constraints)
- {
- struct regulator_ops *ops = rdev->desc->ops;
- int ret;
- /* do we need to apply the constraint voltage */
- if (rdev->constraints->apply_uV &&
- rdev->constraints->min_uV == rdev->constraints->max_uV) {
- ret = _regulator_do_set_voltage(rdev,
- rdev->constraints->min_uV,
- rdev->constraints->max_uV);
- if (ret < 0) {
- rdev_err(rdev, "failed to apply %duV constraint\n",
- rdev->constraints->min_uV);
- rdev->constraints = NULL;
- return ret;
- }
- }
- /* constrain machine-level voltage specs to fit
- * the actual range supported by this regulator.
- */
- if (ops->list_voltage && rdev->desc->n_voltages) {
- int count = rdev->desc->n_voltages;
- int i;
- int min_uV = INT_MAX;
- int max_uV = INT_MIN;
- int cmin = constraints->min_uV;
- int cmax = constraints->max_uV;
- /* it's safe to autoconfigure fixed-voltage supplies
- and the constraints are used by list_voltage. */
- if (count == 1 && !cmin) {
- cmin = 1;
- cmax = INT_MAX;
- constraints->min_uV = cmin;
- constraints->max_uV = cmax;
- }
- /* voltage constraints are optional */
- if ((cmin == 0) && (cmax == 0))
- return 0;
- /* else require explicit machine-level constraints */
- if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
- rdev_err(rdev, "invalid voltage constraints\n");
- return -EINVAL;
- }
- /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
- for (i = 0; i < count; i++) {
- int value;
- value = ops->list_voltage(rdev, i);
- if (value <= 0)
- continue;
- /* maybe adjust [min_uV..max_uV] */
- if (value >= cmin && value < min_uV)
- min_uV = value;
- if (value <= cmax && value > max_uV)
- max_uV = value;
- }
- /* final: [min_uV..max_uV] valid iff constraints valid */
- if (max_uV < min_uV) {
- rdev_err(rdev, "unsupportable voltage constraints\n");
- return -EINVAL;
- }
- /* use regulator's subset of machine constraints */
- if (constraints->min_uV < min_uV) {
- rdev_dbg(rdev, "override min_uV, %d -> %d\n",
- constraints->min_uV, min_uV);
- constraints->min_uV = min_uV;
- }
- if (constraints->max_uV > max_uV) {
- rdev_dbg(rdev, "override max_uV, %d -> %d\n",
- constraints->max_uV, max_uV);
- constraints->max_uV = max_uV;
- }
- }
- return 0;
- }
- /**
- * set_machine_constraints - sets regulator constraints
- * @rdev: regulator source
- * @constraints: constraints to apply
- *
- * 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.
- */
- static int set_machine_constraints(struct regulator_dev *rdev,
- const struct regulation_constraints *constraints)
- {
- int ret = 0;
- struct regulator_ops *ops = rdev->desc->ops;
- rdev->constraints = kmemdup(constraints, sizeof(*constraints),
- GFP_KERNEL);
- if (!rdev->constraints)
- return -ENOMEM;
- ret = machine_constraints_voltage(rdev, rdev->constraints);
- if (ret != 0)
- goto out;
- /* do we need to setup our suspend state */
- if (constraints->initial_state) {
- ret = suspend_prepare(rdev, rdev->constraints->initial_state);
- if (ret < 0) {
- rdev_err(rdev, "failed to set suspend state\n");
- rdev->constraints = NULL;
- goto out;
- }
- }
- if (constraints->initial_mode) {
- if (!ops->set_mode) {
- rdev_err(rdev, "no set_mode operation\n");
- ret = -EINVAL;
- goto out;
- }
- ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
- if (ret < 0) {
- rdev_err(rdev, "failed to set initial mode: %d\n", ret);
- goto out;
- }
- }
- /* If the constraints say the regulator should be on at this point
- * and we have control then make sure it is enabled.
- */
- if ((rdev->constraints->always_on || rdev->constraints->boot_on) &&
- ops->enable) {
- ret = ops->enable(rdev);
- if (ret < 0) {
- rdev_err(rdev, "failed to enable\n");
- rdev->constraints = NULL;
- goto out;
- }
- }
- print_constraints(rdev);
- out:
- return ret;
- }
- /**
- * set_supply - set regulator supply regulator
- * @rdev: regulator name
- * @supply_rdev: 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.
- */
- static int set_supply(struct regulator_dev *rdev,
- struct regulator_dev *supply_rdev)
- {
- int err;
- err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj,
- "supply");
- if (err) {
- rdev_err(rdev, "could not add device link %s err %d\n",
- supply_rdev->dev.kobj.name, err);
- goto out;
- }
- rdev->supply = supply_rdev;
- list_add(&rdev->slist, &supply_rdev->supply_list);
- out:
- return err;
- }
- /**
- * set_consumer_device_supply - Bind a regulator to a symbolic supply
- * @rdev: regulator source
- * @consumer_dev: device the supply applies to
- * @consumer_dev_name: dev_name() string for device 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.
- *
- * Only one of consumer_dev and consumer_dev_name may be specified.
- */
- static int set_consumer_device_supply(struct regulator_dev *rdev,
- struct device *consumer_dev, const char *consumer_dev_name,
- const char *supply)
- {
- struct regulator_map *node;
- int has_dev;
- if (consumer_dev && consumer_dev_name)
- return -EINVAL;
- if (!consumer_dev_name && consumer_dev)
- consumer_dev_name = dev_name(consumer_dev);
- if (supply == NULL)
- return -EINVAL;
- if (consumer_dev_name != NULL)
- has_dev = 1;
- else
- has_dev = 0;
- list_for_each_entry(node, ®ulator_map_list, list) {
- if (node->dev_name && consumer_dev_name) {
- if (strcmp(node->dev_name, consumer_dev_name) != 0)
- continue;
- } else if (node->dev_name || consumer_dev_name) {
- continue;
- }
- if (strcmp(node->supply, supply) != 0)
- continue;
- dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n",
- dev_name(&node->regulator->dev),
- node->regulator->desc->name,
- supply,
- dev_name(&rdev->dev), rdev_get_name(rdev));
- return -EBUSY;
- }
- node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
- if (node == NULL)
- return -ENOMEM;
- node->regulator = rdev;
- node->supply = supply;
- if (has_dev) {
- node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
- if (node->dev_name == NULL) {
- kfree(node);
- return -ENOMEM;
- }
- }
- list_add(&node->list, ®ulator_map_list);
- return 0;
- }
- static void unset_regulator_supplies(struct regulator_dev *rdev)
- {
- struct regulator_map *node, *n;
- list_for_each_entry_safe(node, n, ®ulator_map_list, list) {
- if (rdev == node->regulator) {
- list_del(&node->list);
- kfree(node->dev_name);
- kfree(node);
- }
- }
- }
- #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;
- sysfs_attr_init(®ulator->dev_attr.attr);
- regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL);
- if (regulator->dev_attr.attr.name == NULL)
- goto attr_name_err;
- 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) {
- rdev_warn(rdev, "could not add regulator_dev requested microamps sysfs entry\n");
- 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) {
- rdev_warn(rdev, "could not add device link %s err %d\n",
- dev->kobj.name, err);
- 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;
- }
- static int _regulator_get_enable_time(struct regulator_dev *rdev)
- {
- if (!rdev->desc->ops->enable_time)
- return 0;
- return rdev->desc->ops->enable_time(rdev);
- }
- /* Internal regulator request function */
- static struct regulator *_regulator_get(struct device *dev, const char *id,
- int exclusive)
- {
- struct regulator_dev *rdev;
- struct regulator_map *map;
- struct regulator *regulator = ERR_PTR(-ENODEV);
- const char *devname = NULL;
- int ret;
- if (id == NULL) {
- pr_err("get() with no identifier\n");
- return regulator;
- }
- if (dev)
- devname = dev_name(dev);
- mutex_lock(®ulator_list_mutex);
- list_for_each_entry(map, ®ulator_map_list, list) {
- /* If the mapping has a device set up it must match */
- if (map->dev_name &&
- (!devname || strcmp(map->dev_name, devname)))
- continue;
- if (strcmp(map->supply, id) == 0) {
- rdev = map->regulator;
- goto found;
- }
- }
- if (board_wants_dummy_regulator) {
- rdev = dummy_regulator_rdev;
- goto found;
- }
- #ifdef CONFIG_REGULATOR_DUMMY
- if (!devname)
- devname = "deviceless";
- /* If the board didn't flag that it was fully constrained then
- * substitute in a dummy regulator so consumers can continue.
- */
- if (!has_full_constraints) {
- pr_warn("%s supply %s not found, using dummy regulator\n",
- devname, id);
- rdev = dummy_regulator_rdev;
- goto found;
- }
- #endif
- mutex_unlock(®ulator_list_mutex);
- return regulator;
- found:
- if (rdev->exclusive) {
- regulator = ERR_PTR(-EPERM);
- goto out;
- }
- if (exclusive && rdev->open_count) {
- regulator = ERR_PTR(-EBUSY);
- goto out;
- }
- if (!try_module_get(rdev->owner))
- goto out;
- regulator = create_regulator(rdev, dev, id);
- if (regulator == NULL) {
- regulator = ERR_PTR(-ENOMEM);
- module_put(rdev->owner);
- }
- rdev->open_count++;
- if (exclusive) {
- rdev->exclusive = 1;
- ret = _regulator_is_enabled(rdev);
- if (ret > 0)
- rdev->use_count = 1;
- else
- rdev->use_count = 0;
- }
- out:
- mutex_unlock(®ulator_list_mutex);
- return regulator;
- }
- /**
- * 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. It is recommended that the supply name used
- * should match the name used for the supply and/or the relevant
- * device pins in the datasheet.
- */
- struct regulator *regulator_get(struct device *dev, const char *id)
- {
- return _regulator_get(dev, id, 0);
- }
- EXPORT_SYMBOL_GPL(regulator_get);
- /**
- * regulator_get_exclusive - obtain exclusive access 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. Other consumers will be
- * unable to obtain this reference is held and the use count for the
- * regulator will be initialised to reflect the current state of the
- * regulator.
- *
- * This is intended for use by consumers which cannot tolerate shared
- * use of the regulator such as those which need to force the
- * regulator off for correct operation of the hardware they are
- * controlling.
- *
- * Use of supply names configured via regulator_set_device_supply() is
- * strongly encouraged. It is recommended that the supply name used
- * should match the name used for the supply and/or the relevant
- * device pins in the datasheet.
- */
- struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
- {
- return _regulator_get(dev, id, 1);
- }
- EXPORT_SYMBOL_GPL(regulator_get_exclusive);
- /**
- * 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;
- 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);
- rdev->open_count--;
- rdev->exclusive = 0;
- module_put(rdev->owner);
- mutex_unlock(®ulator_list_mutex);
- }
- EXPORT_SYMBOL_GPL(regulator_put);
- static int _regulator_can_change_status(struct regulator_dev *rdev)
- {
- if (!rdev->constraints)
- return 0;
- if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
- return 1;
- else
- return 0;
- }
- /* locks held by regulator_enable() */
- static int _regulator_enable(struct regulator_dev *rdev)
- {
- int ret, delay;
- if (rdev->use_count == 0) {
- /* do we need to enable the supply regulator first */
- if (rdev->supply) {
- mutex_lock(&rdev->supply->mutex);
- ret = _regulator_enable(rdev->supply);
- mutex_unlock(&rdev->supply->mutex);
- if (ret < 0) {
- rdev_err(rdev, "failed to enable: %d\n", ret);
- return ret;
- }
- }
- }
- /* check voltage and requested load before enabling */
- if (rdev->constraints &&
- (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
- drms_uA_update(rdev);
- if (rdev->use_count == 0) {
- /* The regulator may on if it's not switchable or left on */
- ret = _regulator_is_enabled(rdev);
- if (ret == -EINVAL || ret == 0) {
- if (!_regulator_can_change_status(rdev))
- return -EPERM;
- if (!rdev->desc->ops->enable)
- return -EINVAL;
- /* Query before enabling in case configuration
- * dependent. */
- ret = _regulator_get_enable_time(rdev);
- if (ret >= 0) {
- delay = ret;
- } else {
- rdev_warn(rdev, "enable_time() failed: %d\n",
- ret);
- delay = 0;
- }
- trace_regulator_enable(rdev_get_name(rdev));
- /* Allow the regulator to ramp; it would be useful
- * to extend this for bulk operations so that the
- * regulators can ramp together. */
- ret = rdev->desc->ops->enable(rdev);
- if (ret < 0)
- return ret;
- trace_regulator_enable_delay(rdev_get_name(rdev));
- if (delay >= 1000) {
- mdelay(delay / 1000);
- udelay(delay % 1000);
- } else if (delay) {
- udelay(delay);
- }
- trace_regulator_enable_complete(rdev_get_name(rdev));
- } else if (ret < 0) {
- rdev_err(rdev, "is_enabled() failed: %d\n", ret);
- return ret;
- }
- /* Fallthrough on positive return values - already enabled */
- }
- rdev->use_count++;
- return 0;
- }
- /**
- * regulator_enable - enable regulator output
- * @regulator: regulator source
- *
- * Request that the regulator be enabled with the regulator output at
- * the predefined voltage or current value. Calls to regulator_enable()
- * must be balanced with calls to regulator_disable().
- *
- * NOTE: the output value can be set by other drivers, boot loader or may be
- * hardwired in the regulator.
- */
- int regulator_enable(struct regulator *regulator)
- {
- struct regulator_dev *rdev = regulator->rdev;
- int ret = 0;
- mutex_lock(&rdev->mutex);
- ret = _regulator_enable(rdev);
- mutex_unlock(&rdev->mutex);
- return ret;
- }
- EXPORT_SYMBOL_GPL(regulator_enable);
- /* locks held by regulator_disable() */
- static int _regulator_disable(struct regulator_dev *rdev,
- struct regulator_dev **supply_rdev_ptr)
- {
- int ret = 0;
- *supply_rdev_ptr = NULL;
- if (WARN(rdev->use_count <= 0,
- "unbalanced disables for %s\n", rdev_get_name(rdev)))
- return -EIO;
- /* are we the last user and permitted to disable ? */
- if (rdev->use_count == 1 &&
- (rdev->constraints && !rdev->constraints->always_on)) {
- /* we are last user */
- if (_regulator_can_change_status(rdev) &&
- rdev->desc->ops->disable) {
- trace_regulator_disable(rdev_get_name(rdev));
- ret = rdev->desc->ops->disable(rdev);
- if (ret < 0) {
- rdev_err(rdev, "failed to disable\n");
- return ret;
- }
- trace_regulator_disable_complete(rdev_get_name(rdev));
- _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
- NULL);
- }
- /* decrease our supplies ref count and disable if required */
- *supply_rdev_ptr = 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. Calls to
- * regulator_enable() must be balanced with calls to
- * regulator_disable().
- *
- * NOTE: this will only disable the regulator output if no other consumer
- * devices have it enabled, the regulator device supports disabling and
- * machine constraints permit this operation.
- */
- int regulator_disable(struct regulator *regulator)
- {
- struct regulator_dev *rdev = regulator->rdev;
- struct regulator_dev *supply_rdev = NULL;
- int ret = 0;
- mutex_lock(&rdev->mutex);
- ret = _regulator_disable(rdev, &supply_rdev);
- mutex_unlock(&rdev->mutex);
- /* decrease our supplies ref count and disable if required */
- while (supply_rdev != NULL) {
- rdev = supply_rdev;
- mutex_lock(&rdev->mutex);
- _regulator_disable(rdev, &supply_rdev);
- mutex_unlock(&rdev->mutex);
- }
- return ret;
- }
- EXPORT_SYMBOL_GPL(regulator_disable);
- /* locks held by regulator_force_disable() */
- static int _regulator_force_disable(struct regulator_dev *rdev,
- struct regulator_dev **supply_rdev_ptr)
- {
- 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) {
- rdev_err(rdev, "failed to force disable\n");
- return ret;
- }
- /* notify other consumers that power has been forced off */
- _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
- REGULATOR_EVENT_DISABLE, NULL);
- }
- /* decrease our supplies ref count and disable if required */
- *supply_rdev_ptr = 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)
- {
- struct regulator_dev *rdev = regulator->rdev;
- struct regulator_dev *supply_rdev = NULL;
- int ret;
- mutex_lock(&rdev->mutex);
- regulator->uA_load = 0;
- ret = _regulator_force_disable(rdev, &supply_rdev);
- mutex_unlock(&rdev->mutex);
- if (supply_rdev)
- regulator_disable(get_device_regulator(rdev_get_dev(supply_rdev)));
- return ret;
- }
- EXPORT_SYMBOL_GPL(regulator_force_disable);
- static int _regulator_is_enabled(struct regulator_dev *rdev)
- {
- /* If we don't know then assume that the regulator is always on */
- if (!rdev->desc->ops->is_enabled)
- return 1;
- return rdev->desc->ops->is_enabled(rdev);
- }
- /**
- * regulator_is_enabled - is the regulator output enabled
- * @regulator: regulator source
- *
- * Returns positive if the regulator driver backing the source/client
- * has requested that the device be enabled, zero if it hasn't, else a
- * negative errno code.
- *
- * Note that the device backing this regulator handle can have multiple
- * users, so it might be enabled even if regulator_enable() was never
- * called for this particular source.
- */
- int regulator_is_enabled(struct regulator *regulator)
- {
- int ret;
- mutex_lock(®ulator->rdev->mutex);
- ret = _regulator_is_enabled(regulator->rdev);
- mutex_unlock(®ulator->rdev->mutex);
- return ret;
- }
- EXPORT_SYMBOL_GPL(regulator_is_enabled);
- /**
- * regulator_count_voltages - count regulator_list_voltage() selectors
- * @regulator: regulator source
- *
- * Returns number of selectors, or negative errno. Selectors are
- * numbered starting at zero, and typically correspond to bitfields
- * in hardware registers.
- */
- int regulator_count_voltages(struct regulator *regulator)
- {
- struct regulator_dev *rdev = regulator->rdev;
- return rdev->desc->n_voltages ? : -EINVAL;
- }
- EXPORT_SYMBOL_GPL(regulator_count_voltages);
- /**
- * regulator_list_voltage - enumerate supported voltages
- * @regulator: regulator source
- * @selector: identify voltage to list
- * Context: can sleep
- *
- * Returns a voltage that can be passed to @regulator_set_voltage(),
- * zero if this selector code can't be used on this system, or a
- * negative errno.
- */
- int regulator_list_voltage(struct regulator *regulator, unsigned selector)
- {
- struct regulator_dev *rdev = regulator->rdev;
- struct regulator_ops *ops = rdev->desc->ops;
- int ret;
- if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
- return -EINVAL;
- mutex_lock(&rdev->mutex);
- ret = ops->list_voltage(rdev, selector);
- mutex_unlock(&rdev->mutex);
- if (ret > 0) {
- if (ret < rdev->constraints->min_uV)
- ret = 0;
- else if (ret > rdev->constraints->max_uV)
- ret = 0;
- }
- return ret;
- }
- EXPORT_SYMBOL_GPL(regulator_list_voltage);
- /**
- * regulator_is_supported_voltage - check if a voltage range can be supported
- *
- * @regulator: Regulator to check.
- * @min_uV: Minimum required voltage in uV.
- * @max_uV: Maximum required voltage in uV.
- *
- * Returns a boolean or a negative error code.
- */
- int regulator_is_supported_voltage(struct regulator *regulator,
- int min_uV, int max_uV)
- {
- int i, voltages, ret;
- ret = regulator_count_voltages(regulator);
- if (ret < 0)
- return ret;
- voltages = ret;
- for (i = 0; i < voltages; i++) {
- ret = regulator_list_voltage(regulator, i);
- if (ret >= min_uV && ret <= max_uV)
- return 1;
- }
- return 0;
- }
- static int _regulator_do_set_voltage(struct regulator_dev *rdev,
- int min_uV, int max_uV)
- {
- int ret;
- int delay = 0;
- unsigned int selector;
- trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
- min_uV += rdev->constraints->uV_offset;
- max_uV += rdev->constraints->uV_offset;
- if (rdev->desc->ops->set_voltage) {
- ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV,
- &selector);
- if (rdev->desc->ops->list_voltage)
- selector = rdev->desc->ops->list_voltage(rdev,
- selector);
- else
- selector = -1;
- } else if (rdev->desc->ops->set_voltage_sel) {
- int best_val = INT_MAX;
- int i;
- selector = 0;
- /* Find the smallest voltage that falls within the specified
- * range.
- */
- for (i = 0; i < rdev->desc->n_voltages; i++) {
- ret = rdev->desc->ops->list_voltage(rdev, i);
- if (ret < 0)
- continue;
- if (ret < best_val && ret >= min_uV && ret <= max_uV) {
- best_val = ret;
- selector = i;
- }
- }
- /*
- * If we can't obtain the old selector there is not enough
- * info to call set_voltage_time_sel().
- */
- if (rdev->desc->ops->set_voltage_time_sel &&
- rdev->desc->ops->get_voltage_sel) {
- unsigned int old_selector = 0;
- ret = rdev->desc->ops->get_voltage_sel(rdev);
- if (ret < 0)
- return ret;
- old_selector = ret;
- delay = rdev->desc->ops->set_voltage_time_sel(rdev,
- old_selector, selector);
- }
- if (best_val != INT_MAX) {
- ret = rdev->desc->ops->set_voltage_sel(rdev, selector);
- selector = best_val;
- } else {
- ret = -EINVAL;
- }
- } else {
- ret = -EINVAL;
- }
- /* Insert any necessary delays */
- if (delay >= 1000) {
- mdelay(delay / 1000);
- udelay(delay % 1000);
- } else if (delay) {
- udelay(delay);
- }
- if (ret == 0)
- _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
- NULL);
- trace_regulator_set_voltage_complete(rdev_get_name(rdev), selector);
- return ret;
- }
- /**
- * 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.
- * 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 = 0;
- mutex_lock(&rdev->mutex);
- /* If we're setting the same range as last time the change
- * should be a noop (some cpufreq implementations use the same
- * voltage for multiple frequencies, for example).
- */
- if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
- goto out;
- /* sanity check */
- if (!rdev->desc->ops->set_voltage &&
- !rdev->desc->ops->set_voltage_sel) {
- 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 = regulator_check_consumers(rdev, &min_uV, &max_uV);
- if (ret < 0)
- goto out;
- ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
- out:
- mutex_unlock(&rdev->mutex);
- return ret;
- }
- EXPORT_SYMBOL_GPL(regulator_set_voltage);
- /**
- * regulator_set_voltage_time - get raise/fall time
- * @regulator: regulator source
- * @old_uV: starting voltage in microvolts
- * @new_uV: target voltage in microvolts
- *
- * Provided with the starting and ending voltage, this function attempts to
- * calculate the time in microseconds required to rise or fall to this new
- * voltage.
- */
- int regulator_set_voltage_time(struct regulator *regulator,
- int old_uV, int new_uV)
- {
- struct regulator_dev *rdev = regulator->rdev;
- struct regulator_ops *ops = rdev->desc->ops;
- int old_sel = -1;
- int new_sel = -1;
- int voltage;
- int i;
- /* Currently requires operations to do this */
- if (!ops->list_voltage || !ops->set_voltage_time_sel
- || !rdev->desc->n_voltages)
- return -EINVAL;
- for (i = 0; i < rdev->desc->n_voltages; i++) {
- /* We only look for exact voltage matches here */
- voltage = regulator_list_voltage(regulator, i);
- if (voltage < 0)
- return -EINVAL;
- if (voltage == 0)
- continue;
- if (voltage == old_uV)
- old_sel = i;
- if (voltage == new_uV)
- new_sel = i;
- }
- if (old_sel < 0 || new_sel < 0)
- return -EINVAL;
- return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
- }
- EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
- /**
- * regulator_sync_voltage - re-apply last regulator output voltage
- * @regulator: regulator source
- *
- * Re-apply the last configured voltage. This is intended to be used
- * where some external control source the consumer is cooperating with
- * has caused the configured voltage to change.
- */
- int regulator_sync_voltage(struct regulator *regulator)
- {
- struct regulator_dev *rdev = regulator->rdev;
- int ret, min_uV, max_uV;
- mutex_lock(&rdev->mutex);
- if (!rdev->desc->ops->set_voltage &&
- !rdev->desc->ops->set_voltage_sel) {
- ret = -EINVAL;
- goto out;
- }
- /* This is only going to work if we've had a voltage configured. */
- if (!regulator->min_uV && !regulator->max_uV) {
- ret = -EINVAL;
- goto out;
- }
- min_uV = regulator->min_uV;
- max_uV = regulator->max_uV;
- /* This should be a paranoia check... */
- ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
- if (ret < 0)
- goto out;
- ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
- if (ret < 0)
- goto out;
- ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
- out:
- mutex_unlock(&rdev->mutex);
- return ret;
- }
- EXPORT_SYMBOL_GPL(regulator_sync_voltage);
- static int _regulator_get_voltage(struct regulator_dev *rdev)
- {
- int sel, ret;
- if (rdev->desc->ops->get_voltage_sel) {
- sel = rdev->desc->ops->get_voltage_sel(rdev);
- if (sel < 0)
- return sel;
- ret = rdev->desc->ops->list_voltage(rdev, sel);
- } else if (rdev->desc->ops->get_voltage) {
- ret = rdev->desc->ops->get_voltage(rdev);
- } else {
- return -EINVAL;
- }
- if (ret < 0)
- return ret;
- return ret - rdev->constraints->uV_offset;
- }
- /**
- * regulator_get_voltage - get regulator output voltage
- * @regulator: regulator source
- *
- * This r…