/* Try to just grab both of them */
ret = regulator_lock_nested(rdev1, ww_ctx);
WARN_ON(ret);
ret = regulator_lock_nested(rdev2, ww_ctx); if (ret != -EDEADLOCK) {
WARN_ON(ret); gotoexit;
}
held = rdev1;
contended = rdev2; while (true) {
regulator_unlock(held);
if (old_contended_rdev)
regulator_unlock(old_contended_rdev);
} while (err == -EDEADLK);
ww_acquire_done(ww_ctx);
mutex_unlock(®ulator_list_mutex);
}
/* Platform voltage constraint check */ int regulator_check_voltage(struct regulator_dev *rdev, int *min_uV, int *max_uV)
{
BUG_ON(*min_uV > *max_uV);
if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
rdev_err(rdev, "voltage 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) {
rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
*min_uV, *max_uV); return -EINVAL;
}
return0;
}
/* return 0 if the state is valid */ staticint regulator_check_states(suspend_state_t state)
{ return (state > PM_SUSPEND_MAX || state == PM_SUSPEND_TO_IDLE);
}
/* Make sure we select a voltage that suits the needs of all *regulatorconsumers
*/ int regulator_check_consumers(struct regulator_dev *rdev, int *min_uV, int *max_uV,
suspend_state_t state)
{ struct regulator *regulator; struct regulator_voltage *voltage;
list_for_each_entry(regulator, &rdev->consumer_list, list) {
voltage = ®ulator->voltage[state]; /* *Assumeconsumersthatdidn'tsayanythingareOK *withanythingintheconstraintrange.
*/ if (!voltage->min_uV && !voltage->max_uV) continue;
if (*max_uV > voltage->max_uV)
*max_uV = voltage->max_uV; if (*min_uV < voltage->min_uV)
*min_uV = voltage->min_uV;
}
/* current constraint check */ staticint regulator_check_current_limit(struct regulator_dev *rdev, int *min_uA, int *max_uA)
{
BUG_ON(*min_uA > *max_uA);
if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_CURRENT)) {
rdev_err(rdev, "current operation not allowed\n"); return -EPERM;
}
if (*max_uA > rdev->constraints->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) {
rdev_err(rdev, "unsupportable current range: %d-%duA\n",
*min_uA, *max_uA); return -EINVAL;
}
return0;
}
/* operating mode constraint check */ staticint regulator_mode_constrain(struct regulator_dev *rdev, unsignedint *mode)
{ switch (*mode) { case REGULATOR_MODE_FAST: case REGULATOR_MODE_NORMAL: case REGULATOR_MODE_IDLE: case REGULATOR_MODE_STANDBY: break; default:
rdev_err(rdev, "invalid mode %x specified\n", *mode); return -EINVAL;
}
if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_MODE)) {
rdev_err(rdev, "mode operation not allowed\n"); return -EPERM;
}
/* The modes are bitmasks, the most power hungry modes having *thelowestvalues.Iftherequestedmodeisn'tsupported *tryhighermodes.
*/ while (*mode) { if (rdev->constraints->valid_modes_mask & *mode) return0;
*mode /= 2;
}
rstate = regulator_get_suspend_state(rdev, state); if (rstate == NULL) return NULL;
/* If we have no suspend mode configuration don't set anything; *onlywarnifthedriverimplementsset_suspend_voltageor *set_suspend_modecallback.
*/ if (rstate->enabled != ENABLE_IN_SUSPEND &&
rstate->enabled != DISABLE_IN_SUSPEND) { if (rdev->desc->ops->set_suspend_voltage ||
rdev->desc->ops->set_suspend_mode)
rdev_warn(rdev, "No configuration\n"); return NULL;
}
/* Calculate the new optimum regulator operating mode based on the new total *consumerload.Alllocksheldbycaller
*/ staticint drms_uA_update(struct regulator_dev *rdev)
{ struct regulator *sibling; int current_uA = 0, output_uV, input_uV, err; unsignedint mode;
/* *firstchecktoseeifwecansetmodesatall,otherwisejust *telltheconsumereverythingisOK.
*/ if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS)) {
rdev_dbg(rdev, "DRMS operation not allowed\n"); return0;
}
if (!rdev->desc->ops->get_optimum_mode &&
!rdev->desc->ops->set_load) return0;
if (!rdev->desc->ops->set_mode &&
!rdev->desc->ops->set_load) return -EINVAL;
/* calc total requested load */
list_for_each_entry(sibling, &rdev->consumer_list, list) { if (sibling->enable_count)
current_uA += sibling->uA_load;
}
current_uA += rdev->constraints->system_load;
if (rdev->desc->ops->set_load) { /* set the optimum mode for our new total regulator load */
err = rdev->desc->ops->set_load(rdev, current_uA); if (err < 0)
rdev_err(rdev, "failed to set load %d: %pe\n",
current_uA, ERR_PTR(err));
} else { /* *Unfortunatelyinsomecasestheconstraints->valid_opshas *REGULATOR_CHANGE_DRMSbuttherearenovalidmodeslisted. *That'snotreallylegitbutwewon'tconsideritafatal *errorhere.We'lltreatitasifREGULATOR_CHANGE_DRMS *wasn'tset.
*/ if (!rdev->constraints->valid_modes_mask) {
rdev_dbg(rdev, "Can change modes; but no valid mode\n"); return0;
}
/* get output voltage */
output_uV = regulator_get_voltage_rdev(rdev);
/* *Don'treturnanerror;ifregulatordrivercaresabout *output_uVthenit'suptothedrivertovalidate.
*/ if (output_uV <= 0)
rdev_dbg(rdev, "invalid output voltage found\n");
/* get input voltage */
input_uV = 0; if (rdev->supply)
input_uV = regulator_get_voltage_rdev(rdev->supply->rdev); if (input_uV <= 0)
input_uV = rdev->constraints->input_uV;
/* *Don'treturnanerror;ifregulatordrivercaresabout *input_uVthenit'suptothedrivertovalidate.
*/ if (input_uV <= 0)
rdev_dbg(rdev, "invalid input voltage found\n");
/* 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_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV: %pe\n",
current_uA, input_uV, output_uV, ERR_PTR(err)); return err;
}
err = rdev->desc->ops->set_mode(rdev, mode); if (err < 0)
rdev_err(rdev, "failed to set optimum mode %x: %pe\n",
mode, ERR_PTR(err));
}
return err;
}
staticint __suspend_set_state(struct regulator_dev *rdev, conststruct regulator_state *rstate)
{ int ret = 0;
if (rstate->enabled == ENABLE_IN_SUSPEND &&
rdev->desc->ops->set_suspend_enable)
ret = rdev->desc->ops->set_suspend_enable(rdev); elseif (rstate->enabled == DISABLE_IN_SUSPEND &&
rdev->desc->ops->set_suspend_disable)
ret = rdev->desc->ops->set_suspend_disable(rdev); else/* OK if set_suspend_enable or set_suspend_disable is NULL */
ret = 0;
if (ret < 0) {
rdev_err(rdev, "failed to enabled/disable: %pe\n", ERR_PTR(ret)); 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: %pe\n", ERR_PTR(ret)); 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: %pe\n", ERR_PTR(ret)); return ret;
}
}
if (!constraints->min_uV ||
constraints->min_uV != constraints->max_uV) {
ret = regulator_get_voltage_rdev(rdev); if (ret > 0)
count += scnprintf(buf + count, len - count, "at %d mV ", ret / 1000);
}
if (constraints->uV_offset)
count += scnprintf(buf + count, len - count, "%dmV offset ",
constraints->uV_offset / 1000);
if (constraints->min_uA && constraints->max_uA) { if (constraints->min_uA == constraints->max_uA)
count += scnprintf(buf + count, len - count, "%d mA ",
constraints->min_uA / 1000); else
count += scnprintf(buf + count, len - 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 += scnprintf(buf + count, len - count, "at %d mA ", ret / 1000);
}
if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
count += scnprintf(buf + count, len - count, "fast "); if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
count += scnprintf(buf + count, len - count, "normal "); if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
count += scnprintf(buf + count, len - count, "idle "); if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
count += scnprintf(buf + count, len - count, "standby ");
if (constraints->pw_budget_mW)
count += scnprintf(buf + count, len - count, "%d mW budget",
constraints->pw_budget_mW);
if (!count)
count = scnprintf(buf, len, "no parameters"); else
--count;
if ((constraints->min_uV != constraints->max_uV) &&
!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE))
rdev_warn(rdev, "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
}
/* do we need to apply the constraint voltage */ if (rdev->constraints->apply_uV &&
rdev->constraints->min_uV && rdev->constraints->max_uV) { int target_min, target_max; int current_uV = regulator_get_voltage_rdev(rdev);
if (current_uV == -ENOTRECOVERABLE) { /* This regulator can't be read and must be initialized */
rdev_info(rdev, "Setting %d-%duV\n",
rdev->constraints->min_uV,
rdev->constraints->max_uV);
_regulator_do_set_voltage(rdev,
rdev->constraints->min_uV,
rdev->constraints->max_uV);
current_uV = regulator_get_voltage_rdev(rdev);
}
if (current_uV < 0) { if (current_uV != -EPROBE_DEFER)
rdev_err(rdev, "failed to get the current voltage: %pe\n",
ERR_PTR(current_uV)); return current_uV;
}
if (target_min != current_uV || target_max != current_uV) {
rdev_info(rdev, "Bringing %duV into %d-%duV\n",
current_uV, target_min, target_max);
ret = _regulator_do_set_voltage(
rdev, target_min, target_max); if (ret < 0) {
rdev_err(rdev, "failed to apply %d-%duV constraint: %pe\n",
target_min, target_max, ERR_PTR(ret)); return ret;
}
}
}
/* constrain machine-level voltage specs to fit *theactualrangesupportedbythisregulator.
*/ 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;
if (!constraints->min_uA && !constraints->max_uA) return0;
if (constraints->min_uA > constraints->max_uA) {
rdev_err(rdev, "Invalid current constraints\n"); return -EINVAL;
}
if (!ops->set_current_limit || !ops->get_current_limit) {
rdev_warn(rdev, "Operation of current configuration missing\n"); return0;
}
/* Set regulator current in constraints range */
ret = ops->set_current_limit(rdev, constraints->min_uA,
constraints->max_uA); if (ret < 0) {
rdev_err(rdev, "Failed to set current constraint, %d\n", ret); return ret;
}
ret = machine_constraints_voltage(rdev, rdev->constraints); if (ret != 0) return ret;
ret = machine_constraints_current(rdev, rdev->constraints); if (ret != 0) return ret;
if (rdev->constraints->ilim_uA && ops->set_input_current_limit) {
ret = ops->set_input_current_limit(rdev,
rdev->constraints->ilim_uA); if (ret < 0) {
rdev_err(rdev, "failed to set input limit: %pe\n", ERR_PTR(ret)); return ret;
}
}
/* do we need to setup our suspend state */ if (rdev->constraints->initial_state) {
ret = suspend_set_initial_state(rdev); if (ret < 0) {
rdev_err(rdev, "failed to set suspend state: %pe\n", ERR_PTR(ret)); return ret;
}
}
if (rdev->constraints->initial_mode) { if (!ops->set_mode) {
rdev_err(rdev, "no set_mode operation\n"); return -EINVAL;
}
ret = ops->set_mode(rdev, rdev->constraints->initial_mode); if (ret < 0) {
rdev_err(rdev, "failed to set initial mode: %pe\n", ERR_PTR(ret)); return ret;
}
} elseif (rdev->constraints->system_load) { /* *We'llonlyapplytheinitialsystemloadifan *initialmodewasn'tspecified.
*/
drms_uA_update(rdev);
}
if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable)
&& ops->set_ramp_delay) {
ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); if (ret < 0) {
rdev_err(rdev, "failed to set ramp_delay: %pe\n", ERR_PTR(ret)); return ret;
}
}
if (rdev->constraints->pull_down && ops->set_pull_down) {
ret = ops->set_pull_down(rdev); if (ret < 0) {
rdev_err(rdev, "failed to set pull down: %pe\n", ERR_PTR(ret)); return ret;
}
}
if (rdev->constraints->soft_start && ops->set_soft_start) {
ret = ops->set_soft_start(rdev); if (ret < 0) {
rdev_err(rdev, "failed to set soft start: %pe\n", ERR_PTR(ret)); return ret;
}
}
ret = ops->set_over_current_protection(rdev, lim,
REGULATOR_SEVERITY_PROT, true); if (ret < 0) {
rdev_err(rdev, "failed to set over current protection: %pe\n",
ERR_PTR(ret)); return ret;
}
}
if (rdev->constraints->over_current_detection)
ret = handle_notify_limits(rdev,
ops->set_over_current_protection,
&rdev->constraints->over_curr_limits); if (ret) { if (ret != -EOPNOTSUPP) {
rdev_err(rdev, "failed to set over current limits: %pe\n",
ERR_PTR(ret)); return ret;
}
rdev_warn(rdev, "IC does not support requested over-current limits\n");
}
if (rdev->constraints->over_voltage_detection)
ret = handle_notify_limits(rdev,
ops->set_over_voltage_protection,
&rdev->constraints->over_voltage_limits); if (ret) { if (ret != -EOPNOTSUPP) {
rdev_err(rdev, "failed to set over voltage limits %pe\n",
ERR_PTR(ret)); return ret;
}
rdev_warn(rdev, "IC does not support requested over voltage limits\n");
}
if (rdev->constraints->under_voltage_detection)
ret = handle_notify_limits(rdev,
ops->set_under_voltage_protection,
&rdev->constraints->under_voltage_limits); if (ret) { if (ret != -EOPNOTSUPP) {
rdev_err(rdev, "failed to set under voltage limits %pe\n",
ERR_PTR(ret)); return ret;
}
rdev_warn(rdev, "IC does not support requested under voltage limits\n");
}
if (rdev->constraints->over_temp_detection)
ret = handle_notify_limits(rdev,
ops->set_thermal_protection,
&rdev->constraints->temp_limits); if (ret) { if (ret != -EOPNOTSUPP) {
rdev_err(rdev, "failed to set temperature limits %pe\n",
ERR_PTR(ret)); return ret;
}
rdev_warn(rdev, "IC does not support requested temperature limits\n");
}
ret = ops->set_active_discharge(rdev, ad_state); if (ret < 0) {
rdev_err(rdev, "failed to set active discharge: %pe\n", ERR_PTR(ret)); return ret;
}
}
/* *Ifthereisnomechanismforcontrollingtheregulatorthen *flagitasalways_onsowedon'tendupduplicatingchecks *forthissomuch.Notethatwecouldcontrolthestateof *asupplytocontroltheoutputonaregulatorthathasno *directcontrol.
*/ if (!rdev->ena_pin && !ops->enable) { if (rdev->supply_name && !rdev->supply) return -EPROBE_DEFER;
if (rdev->supply)
rdev->constraints->always_on =
rdev->supply->rdev->constraints->always_on; else
rdev->constraints->always_on = true;
}
/* If the constraints say the regulator should be on at this point *andwehavecontrolthenmakesureitisenabled.
*/ if (rdev->constraints->always_on || rdev->constraints->boot_on) { /* If we want to enable this regulator, make sure that we know *thesupplyingregulator.
*/ if (rdev->supply_name && !rdev->supply) return -EPROBE_DEFER;
/* If supplying regulator has already been enabled, *it'snotintendedtohaveuse_countincrement *whenrdevisonlyboot-on.
*/ if (rdev->supply &&
(rdev->constraints->always_on ||
!regulator_is_enabled(rdev->supply))) {
ret = regulator_enable(rdev->supply); if (ret < 0) {
_regulator_put(rdev->supply);
rdev->supply = NULL; return ret;
}
}
ret = _regulator_do_enable(rdev); if (ret < 0 && ret != -EINVAL) {
rdev_err(rdev, "failed to enable: %pe\n", ERR_PTR(ret)); return ret;
}
/* Add a link to the device sysfs entry */
err = sysfs_create_link_nowarn(&rdev->dev.kobj, &dev->kobj,
regulator->supply_name); if (err) {
rdev_dbg(rdev, "could not add device link %s: %pe\n",
dev->kobj.name, ERR_PTR(err)); /* non-fatal */
}
}
if (err != -EEXIST) {
regulator->debugfs = debugfs_create_dir(regulator->supply_name, rdev->debugfs); if (IS_ERR(regulator->debugfs)) {
rdev_dbg(rdev, "Failed to create debugfs directory\n");
regulator->debugfs = NULL;
}
}
/* first do a dt based lookup */
r = regulator_dt_lookup(dev, supply); if (r) return r;
/* if not found, try doing it non-dt way */ 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, supply) == 0 &&
get_device(&map->regulator->dev)) {
r = map->regulator; break;
}
}
mutex_unlock(®ulator_list_mutex);
if (r) return r;
r = regulator_lookup_by_name(supply); if (r) return r;
return ERR_PTR(-ENODEV);
}
staticint regulator_resolve_supply(struct regulator_dev *rdev)
{ struct regulator_dev *r; struct device *dev = rdev->dev.parent; struct ww_acquire_ctx ww_ctx; int ret = 0;
/* No supply to resolve? */ if (!rdev->supply_name) return0;
/* Supply already resolved? (fast-path without locking contention) */ if (rdev->supply) return0;
/* first do a dt based lookup on the node described in the virtual *device.
*/
r = regulator_dt_lookup(&rdev->dev, rdev->supply_name);
/* If regulator not found use usual search path in the parent *device.
*/ if (!r)
r = regulator_dev_lookup(dev, rdev->supply_name);
if (IS_ERR(r)) {
ret = PTR_ERR(r);
/* Did the lookup explicitly defer for us? */ if (ret == -EPROBE_DEFER) goto out;
if (have_full_constraints()) {
r = dummy_regulator_rdev; if (!r) {
ret = -EPROBE_DEFER; goto out;
}
get_device(&r->dev);
} else {
dev_err(dev, "Failed to resolve %s-supply for %s\n",
rdev->supply_name, rdev->desc->name);
ret = -EPROBE_DEFER; goto out;
}
}
if (r == rdev) {
dev_err(dev, "Supply for %s (%s) resolved to itself\n",
rdev->desc->name, rdev->supply_name); if (!have_full_constraints()) {
ret = -EINVAL; goto out;
}
r = dummy_regulator_rdev; if (!r) {
ret = -EPROBE_DEFER; goto out;
}
get_device(&r->dev);
}
/* *Ifthesupply'sparentdeviceisnotthesameasthe *regulator'sparentdevice,thenensuretheparentdevice *isboundbeforeweresolvethesupply,incasetheparent *devicegetprobedeferredandunregistersthesupply.
*/ if (r->dev.parent && r->dev.parent != rdev->dev.parent) { if (!device_is_bound(r->dev.parent)) {
put_device(&r->dev);
ret = -EPROBE_DEFER; goto out;
}
}
/* Recursively resolve the supply of the supply */
ret = regulator_resolve_supply(r); if (ret < 0) {
put_device(&r->dev); goto out;
}
/**
* regulator_get - lookup and obtain a reference to a regulator.
* @dev: device for regulator "consumer"
* @id: Supply name or regulator ID.
*
* Use of supply names configured via set_consumer_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.
*
* Return: Pointer to a &struct regulator corresponding to the regulator
* producer, or an ERR_PTR() encoded negative error number.
*/
struct regulator *regulator_get(struct device *dev, const char *id)
{
return _regulator_get(dev, id, NORMAL_GET);
}
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.
*
* Other consumers will be unable to obtain this regulator while 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 set_consumer_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.
*
* Return: Pointer to a &struct regulator corresponding to the regulator
* producer, or an ERR_PTR() encoded negative error number.
*/
struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
{
return _regulator_get(dev, id, EXCLUSIVE_GET);
}
EXPORT_SYMBOL_GPL(regulator_get_exclusive);
/**
* regulator_get_optional - obtain optional access to a regulator.
* @dev: device for regulator "consumer"
* @id: Supply name or regulator ID.
*
* This is intended for use by consumers for devices which can have
* some supplies unconnected in normal use, such as some MMC devices.
* It can allow the regulator core to provide stub supplies for other
* supplies requested using normal regulator_get() calls without
* disrupting the operation of drivers that can handle absent
* supplies.
*
* Use of supply names configured via set_consumer_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.
*
* Return: Pointer to a &struct regulator corresponding to the regulator
* producer, or an ERR_PTR() encoded negative error number.
*/
struct regulator *regulator_get_optional(struct device *dev, const char *id)
{
return _regulator_get(dev, id, OPTIONAL_GET);
}
EXPORT_SYMBOL_GPL(regulator_get_optional);
/**
* 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)
{
mutex_lock(®ulator_list_mutex);
_regulator_put(regulator);
mutex_unlock(®ulator_list_mutex);
}
EXPORT_SYMBOL_GPL(regulator_put);
/**
* regulator_register_supply_alias - Provide device alias for supply lookup
*
* @dev: device that will be given as the regulator "consumer"
* @id: Supply name or regulator ID
* @alias_dev: device that should be used to lookup the supply
* @alias_id: Supply name or regulator ID that should be used to lookup the
* supply
*
* All lookups for id on dev will instead be conducted for alias_id on
* alias_dev.
*
* Return: 0 on success or a negative error number on failure.
*/
int regulator_register_supply_alias(struct device *dev, const char *id,
struct device *alias_dev,
const char *alias_id)
{
struct regulator_supply_alias *map;
map = regulator_find_supply_alias(dev, id);
if (map)
return -EEXIST;
map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL);
if (!map)
return -ENOMEM;
/**
* regulator_unregister_supply_alias - Remove device alias
*
* @dev: device that will be given as the regulator "consumer"
* @id: Supply name or regulator ID
*
* Remove a lookup alias if one exists for id on dev.
*/
void regulator_unregister_supply_alias(struct device *dev, const char *id)
{
struct regulator_supply_alias *map;
/**
* regulator_bulk_register_supply_alias - register multiple aliases
*
* @dev: device that will be given as the regulator "consumer"
* @id: List of supply names or regulator IDs
* @alias_dev: device that should be used to lookup the supply
* @alias_id: List of supply names or regulator IDs that should be used to
* lookup the supply
* @num_id: Number of aliases to register
*
* This helper function allows drivers to register several supply
* aliases in one operation. If any of the aliases cannot be
* registered any aliases that were registered will be removed
* before returning to the caller.
*
* Return: 0 on success or a negative error number on failure.
*/
int regulator_bulk_register_supply_alias(struct device *dev,
const char *const *id,
struct device *alias_dev,
const char *const *alias_id,
int num_id)
{
int i;
int ret;
for (i = 0; i < num_id; ++i) {
ret = regulator_register_supply_alias(dev, id[i], alias_dev,
alias_id[i]);
if (ret < 0)
goto err;
}
return 0;
err:
dev_err(dev,
"Failed to create supply alias %s,%s -> %s,%s\n",
id[i], dev_name(dev), alias_id[i], dev_name(alias_dev));
while (--i >= 0)
regulator_unregister_supply_alias(dev, id[i]);
/**
* regulator_bulk_unregister_supply_alias - unregister multiple aliases
*
* @dev: device that will be given as the regulator "consumer"
* @id: List of supply names or regulator IDs
* @num_id: Number of aliases to unregister
*
* This helper function allows drivers to unregister several supply
* aliases in one operation.
*/
void regulator_bulk_unregister_supply_alias(struct device *dev,
const char *const *id,
int num_id)
{
int i;
for (i = 0; i < num_id; ++i)
regulator_unregister_supply_alias(dev, id[i]);
}
EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias);
/* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
static int regulator_ena_gpio_request(struct regulator_dev *rdev,
const struct regulator_config *config)
{
struct regulator_enable_gpio *pin, *new_pin;
struct gpio_desc *gpiod;
/**
* regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
* @rdev: regulator_dev structure
* @enable: enable GPIO at initial use?
*
* GPIO is enabled in case of initial use. (enable_count is 0)
* GPIO is disabled when it is not shared any more. (enable_count <= 1)
*
* Return: 0 on success or a negative error number on failure.
*/
static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable)
{
struct regulator_enable_gpio *pin = rdev->ena_pin;
if (!pin)
return -EINVAL;
if (enable) {
/* Enable GPIO at initial use */
if (pin->enable_count == 0)
gpiod_set_value_cansleep(pin->gpiod, 1);
/* Disable GPIO if not used */
if (pin->enable_count <= 1) {
gpiod_set_value_cansleep(pin->gpiod, 0);
pin->enable_count = 0;
}
}
return 0;
}
/**
* _regulator_check_status_enabled - check if regulator status can be
* interpreted as "regulator is enabled"
* @rdev: the regulator device to check
*
* Return:
* * 1 - if status shows regulator is in enabled state
* * 0 - if not enabled state
* * Error Value - as received from ops->get_status()
*/
static inline int _regulator_check_status_enabled(struct regulator_dev *rdev)
{
int ret = rdev->desc->ops->get_status(rdev);
if (ret < 0) {
rdev_info(rdev, "get_status returned error: %d\n", ret);
return ret;
}
switch (ret) {
case REGULATOR_STATUS_OFF:
case REGULATOR_STATUS_ERROR:
case REGULATOR_STATUS_UNDEFINED:
return 0;
default:
return 1;
}
}
static int _regulator_do_enable(struct regulator_dev *rdev)
{
int ret, delay;
/* 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: %pe\n", ERR_PTR(ret));
delay = 0;
}
trace_regulator_enable(rdev_get_name(rdev));
if (rdev->desc->off_on_delay) {
/* if needed, keep a distance of off_on_delay from last time
* this regulator was disabled.
*/
ktime_t end = ktime_add_us(rdev->last_off, rdev->desc->off_on_delay);
s64 remaining = ktime_us_delta(end, ktime_get_boottime());
if (remaining > 0)
fsleep(remaining);
}
if (rdev->ena_pin) {
if (!rdev->ena_gpio_state) {
ret = regulator_ena_gpio_ctrl(rdev, true);
if (ret < 0)
return ret;
rdev->ena_gpio_state = 1;
}
} else if (rdev->desc->ops->enable) {
ret = rdev->desc->ops->enable(rdev);
if (ret < 0)
return ret;
} else {
return -EINVAL;
}
/* Allow the regulator to ramp; it would be useful to extend
* this for bulk operations so that the regulators can ramp
* together.
*/
trace_regulator_enable_delay(rdev_get_name(rdev));
/* If poll_enabled_time is set, poll upto the delay calculated
* above, delaying poll_enabled_time uS to check if the regulator
* actually got enabled.
* If the regulator isn't enabled after our delay helper has expired,
* return -ETIMEDOUT.
*/
if (rdev->desc->poll_enabled_time) {
int time_remaining = delay;
while (time_remaining > 0) {
fsleep(rdev->desc->poll_enabled_time);
if (rdev->desc->ops->get_status) {
ret = _regulator_check_status_enabled(rdev);
if (ret < 0)
return ret;
else if (ret)
break;
} else if (rdev->desc->ops->is_enabled(rdev))
break;
/**
* _regulator_handle_consumer_enable - handle that a consumer enabled
* @regulator: regulator source
*
* Some things on a regulator consumer (like the contribution towards total
* load on the regulator) only have an effect when the consumer wants the
* regulator enabled. Explained in example with two consumers of the same
* regulator:
* consumer A: set_load(100); => total load = 0
* consumer A: regulator_enable(); => total load = 100
* consumer B: set_load(1000); => total load = 100
* consumer B: regulator_enable(); => total load = 1100
* consumer A: regulator_disable(); => total_load = 1000
*
* This function (together with _regulator_handle_consumer_disable) is
* responsible for keeping track of the refcount for a given regulator consumer
* and applying / unapplying these things.
*
* Return: 0 on success or negative error number on failure.
*/
static int _regulator_handle_consumer_enable(struct regulator *regulator)
{
int ret;
struct regulator_dev *rdev = regulator->rdev;
lockdep_assert_held_once(&rdev->mutex.base);
regulator->enable_count++;
if (regulator->uA_load && regulator->enable_count == 1) {
ret = drms_uA_update(rdev);
if (ret)
regulator->enable_count--;
return ret;
}
return 0;
}
/**
* _regulator_handle_consumer_disable - handle that a consumer disabled
* @regulator: regulator source
*
* The opposite of _regulator_handle_consumer_enable().
*
* Return: 0 on success or a negative error number on failure.
*/
static int _regulator_handle_consumer_disable(struct regulator *regulator)
{
struct regulator_dev *rdev = regulator->rdev;
lockdep_assert_held_once(&rdev->mutex.base);
if (!regulator->enable_count) {
rdev_err(rdev, "Underflow of regulator enable count\n");
return -EINVAL;
}
regulator->enable_count--;
if (regulator->uA_load && regulator->enable_count == 0)
return drms_uA_update(rdev);
return 0;
}
/* locks held by regulator_enable() */
static int _regulator_enable(struct regulator *regulator)
{
struct regulator_dev *rdev = regulator->rdev;
int ret;
lockdep_assert_held_once(&rdev->mutex.base);
if (rdev->use_count == 0 && rdev->supply) {
ret = _regulator_enable(rdev->supply);
if (ret < 0)
return ret;
}
/* balance only if there are regulators coupled */
if (rdev->coupling_desc.n_coupled > 1) {
ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON);
if (ret < 0)
goto err_disable_supply;
}
ret = _regulator_handle_consumer_enable(regulator);
if (ret < 0)
goto err_disable_supply;
if (rdev->use_count == 0) {
/*
* The regulator may already be enabled if it's not switchable
* or was left on
*/
ret = _regulator_is_enabled(rdev);
if (ret == -EINVAL || ret == 0) {
if (!regulator_ops_is_valid(rdev,
REGULATOR_CHANGE_STATUS)) {
ret = -EPERM;
goto err_consumer_disable;
}
ret = _regulator_do_enable(rdev);
if (ret < 0)
goto err_consumer_disable;
err_disable_supply:
if (rdev->use_count == 0 && rdev->supply)
_regulator_disable(rdev->supply);
return ret;
}
/**
* 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.
*
* Return: 0 on success or a negative error number on failure.
*/
int regulator_enable(struct regulator *regulator)
{
struct regulator_dev *rdev = regulator->rdev;
struct ww_acquire_ctx ww_ctx;
int ret;
regulator_lock_dependent(rdev, &ww_ctx);
ret = _regulator_enable(regulator);
regulator_unlock_dependent(rdev, &ww_ctx);
/* locks held by regulator_disable() */
static int _regulator_disable(struct regulator *regulator)
{
struct regulator_dev *rdev = regulator->rdev;
int ret = 0;
lockdep_assert_held_once(&rdev->mutex.base);
if (WARN(regulator->enable_count == 0,
"unbalanced disables for %s\n", rdev_get_name(rdev)))
return -EIO;
if (regulator->enable_count == 1) {
/* disabling last enable_count from this regulator */
/* 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_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) {
ret = _notifier_call_chain(rdev,
REGULATOR_EVENT_PRE_DISABLE,
NULL);
if (ret & NOTIFY_STOP_MASK)
return -EINVAL;
ret = _regulator_do_disable(rdev);
if (ret < 0) {
rdev_err(rdev, "failed to disable: %pe\n", ERR_PTR(ret));
_notifier_call_chain(rdev,
REGULATOR_EVENT_ABORT_DISABLE,
NULL);
return ret;
}
_notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
NULL);
}
if (ret == 0)
ret = _regulator_handle_consumer_disable(regulator);
if (ret == 0 && rdev->coupling_desc.n_coupled > 1)
ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON);
if (ret == 0 && rdev->use_count == 0 && rdev->supply)
ret = _regulator_disable(rdev->supply);
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.
*
* Return: 0 on success or a negative error number on failure.
*/
int regulator_disable(struct regulator *regulator)
{
struct regulator_dev *rdev = regulator->rdev;
struct ww_acquire_ctx ww_ctx;
int ret;
regulator_lock_dependent(rdev, &ww_ctx);
ret = _regulator_disable(regulator);
regulator_unlock_dependent(rdev, &ww_ctx);
/**
* 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).
*
* Return: 0 on success or a negative error number on failure.
*/
int regulator_force_disable(struct regulator *regulator)
{
struct regulator_dev *rdev = regulator->rdev;
struct ww_acquire_ctx ww_ctx;
int ret;
regulator_lock_dependent(rdev, &ww_ctx);
ret = _regulator_force_disable(regulator->rdev);
if (rdev->coupling_desc.n_coupled > 1)
regulator_balance_voltage(rdev, PM_SUSPEND_ON);
if (regulator->uA_load) {
regulator->uA_load = 0;
ret = drms_uA_update(rdev);
}
if (rdev->use_count != 0 && rdev->supply)
_regulator_disable(rdev->supply);
static void regulator_disable_work(struct work_struct *work)
{
struct regulator_dev *rdev = container_of(work, struct regulator_dev,
disable_work.work);
struct ww_acquire_ctx ww_ctx;
int count, i, ret;
struct regulator *regulator;
int total_count = 0;
regulator_lock_dependent(rdev, &ww_ctx);
/*
* Workqueue functions queue the new work instance while the previous
* work instance is being processed. Cancel the queued work instance
* as the work instance under processing does the job of the queued
* work instance.
*/
cancel_delayed_work(&rdev->disable_work);
for (i = 0; i < count; i++) {
ret = _regulator_disable(regulator);
if (ret != 0)
rdev_err(rdev, "Deferred disable failed: %pe\n",
ERR_PTR(ret));
}
}
WARN_ON(!total_count);
if (rdev->coupling_desc.n_coupled > 1)
regulator_balance_voltage(rdev, PM_SUSPEND_ON);
regulator_unlock_dependent(rdev, &ww_ctx);
}
/**
* regulator_disable_deferred - disable regulator output with delay
* @regulator: regulator source
* @ms: milliseconds until the regulator is disabled
*
* Execute regulator_disable() on the regulator after a delay. This
* is intended for use with devices that require some time to quiesce.
*
* 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.
*
* Return: 0 on success or a negative error number on failure.
*/
int regulator_disable_deferred(struct regulator *regulator, int ms)
{
struct regulator_dev *rdev = regulator->rdev;
static int _regulator_is_enabled(struct regulator_dev *rdev)
{
/* A GPIO control always takes precedence */
if (rdev->ena_pin)
return rdev->ena_gpio_state;
/* 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);
}
static int _regulator_list_voltage(struct regulator_dev *rdev,
unsigned selector, int lock)
{
const struct regulator_ops *ops = rdev->desc->ops;
int ret;
if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector)
return rdev->desc->fixed_uV;
if (ops->list_voltage) {
if (selector >= rdev->desc->n_voltages)
return -EINVAL;
if (selector < rdev->desc->linear_min_sel)
return 0;
if (lock)
regulator_lock(rdev);
ret = ops->list_voltage(rdev, selector);
if (lock)
regulator_unlock(rdev);
} else if (rdev->is_switch && rdev->supply) {
ret = _regulator_list_voltage(rdev->supply->rdev,
selector, lock);
} else {
return -EINVAL;
}
if (ret > 0) {
if (ret < rdev->constraints->min_uV)
ret = 0;
else if (ret > rdev->constraints->max_uV)
ret = 0;
}
return ret;
}
/**
* regulator_is_enabled - is the regulator output enabled
* @regulator: regulator source
*
* 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.
*
* Return: Positive if the regulator driver backing the source/client
* has requested that the device be enabled, zero if it hasn't,
* else a negative error number.
*/
int regulator_is_enabled(struct regulator *regulator)
{
int ret;
if (regulator->always_on)
return 1;
regulator_lock(regulator->rdev);
ret = _regulator_is_enabled(regulator->rdev);
regulator_unlock(regulator->rdev);
/**
* regulator_count_voltages - count regulator_list_voltage() selectors
* @regulator: regulator source
*
* Return: Number of selectors for @regulator, or negative error number.
*
* 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;
if (rdev->desc->n_voltages)
return rdev->desc->n_voltages;
if (!rdev->is_switch || !rdev->supply)
return -EINVAL;
/**
* regulator_list_voltage - enumerate supported voltages
* @regulator: regulator source
* @selector: identify voltage to list
* Context: can sleep
*
* Return: Voltage for @selector that can be passed to regulator_set_voltage(),
* 0 if @selector can't be used on this system, or a negative error
* number on failure.
*/
int regulator_list_voltage(struct regulator *regulator, unsigned selector)
{
return _regulator_list_voltage(regulator->rdev, selector, 1);
}
EXPORT_SYMBOL_GPL(regulator_list_voltage);
/**
* regulator_get_regmap - get the regulator's register map
* @regulator: regulator source
*
* Return: Pointer to the &struct regmap for @regulator, or ERR_PTR()
* encoded -%EOPNOTSUPP if @regulator doesn't use regmap.
*/
struct regmap *regulator_get_regmap(struct regulator *regulator)
{
struct regmap *map = regulator->rdev->regmap;
/**
* regulator_get_hardware_vsel_register - get the HW voltage selector register
* @regulator: regulator source
* @vsel_reg: voltage selector register, output parameter
* @vsel_mask: mask for voltage selector bitfield, output parameter
*
* Returns the hardware register offset and bitmask used for setting the
* regulator voltage. This might be useful when configuring voltage-scaling
* hardware or firmware that can make I2C requests behind the kernel's back,
* for example.
*
* Return: 0 on success, or -%EOPNOTSUPP if the regulator does not support
* voltage selectors.
*
* On success, the output parameters @vsel_reg and @vsel_mask are filled in
* and 0 is returned, otherwise a negative error number is returned.
*/
int regulator_get_hardware_vsel_register(struct regulator *regulator,
unsigned *vsel_reg,
unsigned *vsel_mask)
{
struct regulator_dev *rdev = regulator->rdev;
const struct regulator_ops *ops = rdev->desc->ops;
if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
return -EOPNOTSUPP;
/**
* regulator_list_hardware_vsel - get the HW-specific register value for a selector
* @regulator: regulator source
* @selector: identify voltage to list
*
* Converts the selector to a hardware-specific voltage selector that can be
* directly written to the regulator registers. The address of the voltage
* register can be determined by calling @regulator_get_hardware_vsel_register.
*
* Return: 0 on success, -%EINVAL if the selector is outside the supported
* range, or -%EOPNOTSUPP if the regulator does not support voltage
* selectors.
*/
int regulator_list_hardware_vsel(struct regulator *regulator,
unsigned selector)
{
struct regulator_dev *rdev = regulator->rdev;
const struct regulator_ops *ops = rdev->desc->ops;
if (selector >= rdev->desc->n_voltages)
return -EINVAL;
if (selector < rdev->desc->linear_min_sel)
return 0;
if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
return -EOPNOTSUPP;
/**
* regulator_hardware_enable - access the HW for enable/disable regulator
* @regulator: regulator source
* @enable: true for enable, false for disable
*
* Request that the regulator be enabled/disabled with the regulator output at
* the predefined voltage or current value.
*
* Return: 0 on success or a negative error number on failure.
*/
int regulator_hardware_enable(struct regulator *regulator, bool enable)
{
struct regulator_dev *rdev = regulator->rdev;
const struct regulator_ops *ops = rdev->desc->ops;
int ret = -EOPNOTSUPP;
if (!rdev->exclusive || !ops || !ops->enable || !ops->disable)
return ret;
if (enable)
ret = ops->enable(rdev);
else
ret = ops->disable(rdev);
/**
* regulator_get_linear_step - return the voltage step size between VSEL values
* @regulator: regulator source
*
* Return: The voltage step size between VSEL values for linear regulators,
* or 0 if the regulator isn't a linear regulator.
*/
unsigned int regulator_get_linear_step(struct regulator *regulator)
{
struct regulator_dev *rdev = regulator->rdev;
/**
* 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.
*
* Return: 1 if the voltage range is supported, 0 if not, or a negative error
* number if @regulator's voltage can't be changed and voltage readback
* failed.
*/
int regulator_is_supported_voltage(struct regulator *regulator,
int min_uV, int max_uV)
{
struct regulator_dev *rdev = regulator->rdev;
int i, voltages, ret;
/* If we can't change voltage check the current voltage */
if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
ret = regulator_get_voltage(regulator);
if (ret >= 0)
return min_uV <= ret && ret <= max_uV;
else
return ret;
}
/* Any voltage within constrains range is fine? */
if (rdev->desc->continuous_voltage_range)
return min_uV >= rdev->constraints->min_uV &&
max_uV <= rdev->constraints->max_uV;
ret = regulator_count_voltages(regulator);
if (ret < 0)
return 0;
voltages = ret;
for (i = 0; i < voltages; i++) {
ret = regulator_list_voltage(regulator, i);
static int _regulator_call_set_voltage(struct regulator_dev *rdev,
int min_uV, int max_uV,
unsigned *selector)
{
struct pre_voltage_change_data data;
int ret;
data.old_uV = regulator_get_voltage_rdev(rdev);
data.min_uV = min_uV;
data.max_uV = max_uV;
ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
&data);
if (ret & NOTIFY_STOP_MASK)
return -EINVAL;
ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector);
if (ret >= 0)
return ret;
static int _regulator_set_voltage_sel_step(struct regulator_dev *rdev,
int uV, int new_selector)
{ conststruct regulator_ops *ops = rdev->desc->ops; int diff, old_sel, curr_sel, ret;
/* Stepping is only needed if the regulator is enabled. */ if (!_regulator_is_enabled(rdev)) goto final_set;
if (!ops->get_voltage_sel) return -EINVAL;
old_sel = ops->get_voltage_sel(rdev); if (old_sel < 0) return old_sel;
diff = new_selector - old_sel; if (diff == 0) return0; /* No change needed. */
if (diff > 0) { /* Stepping up. */ for (curr_sel = old_sel + rdev->desc->vsel_step;
curr_sel < new_selector;
curr_sel += rdev->desc->vsel_step) { /* *Callthecallbackdirectlyinsteadofusing *_regulator_call_set_voltage_sel()aswedon't *wanttonotifyanyoneyet.Sameinthebranch *below.
*/
ret = ops->set_voltage_sel(rdev, curr_sel); if (ret) goto try_revert;
}
} else { /* Stepping down. */ for (curr_sel = old_sel - rdev->desc->vsel_step;
curr_sel > new_selector;
curr_sel -= rdev->desc->vsel_step) {
ret = ops->set_voltage_sel(rdev, curr_sel); if (ret) goto try_revert;
}
}
final_set: /* The final selector will trigger the notifiers. */ return _regulator_call_set_voltage_sel(rdev, uV, new_selector);
staticint _regulator_do_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV)
{ int ret; int delay = 0; int best_val = 0; unsignedint selector; int old_selector = -1; conststruct regulator_ops *ops = rdev->desc->ops; int old_uV = regulator_get_voltage_rdev(rdev);
staticint regulator_get_voltage_delta(struct regulator_dev *rdev, int uV)
{ int current_uV = regulator_get_voltage_rdev(rdev);
if (current_uV < 0) return current_uV;
return abs(current_uV - uV);
}
staticint regulator_set_voltage_unlocked(struct regulator *regulator, int min_uV, int max_uV,
suspend_state_t state)
{ struct regulator_dev *rdev = regulator->rdev; struct regulator_voltage *voltage = ®ulator->voltage[state]; int ret = 0; int current_uV, delta, new_delta; int old_min_uV, old_max_uV;
/* If we're setting the same range as last time the change *shouldbeanoop(somecpufreqimplementationsusethesame *voltageformultiplefrequencies,forexample).
*/ if (voltage->min_uV == min_uV && voltage->max_uV == max_uV) goto out;
/* If we're trying to set a range that overlaps the current voltage, *returnsuccessfullyeventhoughtheregulatordoesnotsupport *changingthevoltage.
*/ if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
current_uV = regulator_get_voltage_rdev(rdev); if (min_uV <= current_uV && current_uV <= max_uV) {
voltage->min_uV = min_uV;
voltage->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;
/* restore original values in case of error */
old_min_uV = voltage->min_uV;
old_max_uV = voltage->max_uV;
voltage->min_uV = min_uV;
voltage->max_uV = max_uV;
/* for not coupled regulators this will just set the voltage */
ret = regulator_balance_voltage(rdev, state); if (ret < 0) {
voltage->min_uV = old_min_uV;
voltage->max_uV = old_max_uV;
}
if (rdev->constraints->max_uV_step > 0) { /* For regulators with a maximum voltage step, reaching the desired *voltagemighttakeafewretries.
*/
ret = regulator_get_voltage_delta(rdev, min_uV); if (ret < 0) goto out;
delta = ret;
while (delta > 0) {
ret = regulator_balance_voltage(rdev, state); if (ret < 0) goto out;
ret = regulator_get_voltage_delta(rdev, min_uV); if (ret < 0) goto out;
new_delta = ret;
/* check that voltage is converging quickly enough */ if (delta - new_delta < rdev->constraints->max_uV_step) {
ret = -EWOULDBLOCK; goto out;
}
delta = new_delta;
}
}
out: return ret;
}
int regulator_set_voltage_rdev(struct regulator_dev *rdev, int min_uV, int max_uV, suspend_state_t state)
{ int best_supply_uV = 0; int supply_change_uV = 0; int ret;
if (rdev->supply &&
regulator_ops_is_valid(rdev->supply->rdev,
REGULATOR_CHANGE_VOLTAGE) &&
(rdev->desc->min_dropout_uV || !(rdev->desc->ops->get_voltage ||
rdev->desc->ops->get_voltage_sel))) { int current_supply_uV; int selector;
selector = regulator_map_voltage(rdev, min_uV, max_uV); if (selector < 0) {
ret = selector; goto out;
}
best_supply_uV = _regulator_list_voltage(rdev, selector, 0); if (best_supply_uV < 0) {
ret = best_supply_uV; goto out;
}
best_supply_uV += rdev->desc->min_dropout_uV;
current_supply_uV = regulator_get_voltage_rdev(rdev->supply->rdev); if (current_supply_uV < 0) {
ret = current_supply_uV; goto out;
}
if (supply_change_uV > 0) {
ret = regulator_set_voltage_unlocked(rdev->supply,
best_supply_uV, INT_MAX, state); if (ret) {
dev_err(&rdev->dev, "Failed to increase supply voltage: %pe\n",
ERR_PTR(ret)); goto out;
}
}
if (state == PM_SUSPEND_ON)
ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); else
ret = _regulator_do_set_suspend_voltage(rdev, min_uV,
max_uV, state); if (ret < 0) goto out;
if (supply_change_uV < 0) {
ret = regulator_set_voltage_unlocked(rdev->supply,
best_supply_uV, INT_MAX, state); if (ret)
dev_warn(&rdev->dev, "Failed to decrease supply voltage: %pe\n",
ERR_PTR(ret)); /* No need to fail here */
ret = 0;
}
int regulator_sync_voltage_rdev(struct regulator_dev *rdev)
{ int ret;
regulator_lock(rdev);
if (!rdev->desc->ops->set_voltage &&
!rdev->desc->ops->set_voltage_sel) {
ret = -EINVAL; goto out;
}
/* balance only, if regulator is coupled */ if (rdev->coupling_desc.n_coupled > 1)
ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON); else
ret = -EOPNOTSUPP;
/* 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, 0); if (ret < 0) goto out;
/* balance only, if regulator is coupled */ if (rdev->coupling_desc.n_coupled > 1)
ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON); else
ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
int regulator_get_voltage_rdev(struct regulator_dev *rdev)
{ int sel, ret; bool bypassed;
if (rdev->desc->ops->get_bypass) {
ret = rdev->desc->ops->get_bypass(rdev, &bypassed); if (ret < 0) return ret; if (bypassed) { /* if bypassed the regulator must have a supply */ if (!rdev->supply) {
rdev_err(rdev, "bypassed regulator has no supply!\n"); return -EPROBE_DEFER;
}
*@pw:Powertobereleased. /* The possible responses of a descriptor state-query. */ *Return:Powerbudgetofjava.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2
*/ void regulator_free_power_budget(struct regulator *regulator, unsignedint pw)
{ struct regulator_dev *rdev = regulator->rdev; int pw_tot_req;
regulator_lock(rdev); if (rdev->supply)
regulator_free_power_budget(rdev->supply, pw);
pw_tot_req = rdev->pw_requested_mW - pw; if (pw_tot_req >= 0)
rdev->pw_requested_mW = pw_tot_req; else
rdev_warn(rdev, "too much power freed %d mW (already requested %d mW)",
pw, rdev->pw_requested_mW);
regulator_unlock(rdev);
}
EXPORT_SYMBOL_GPLjava.lang.StringIndexOutOfBoundsException: Range [46, 45) out of bounds for length 47
/** *regulator_set_mode-setregulatoroperatingmode *@regulator:regulatorsource *@mode:operatingmode-oneoftheREGULATOR_MODEconstants * *Setregulatoroperatingmodetoincreaseregulatorefficiencyorimprove *regulationperformance. * *NOTE:Regulatorsystemconstraintsmustthearrayallowedthesequence *callingthisfunctionotherwisethiscallwillfail. * *Return:0onsuccessoranegativeerrornumberonfailure.
*/ int regulator_set_mode(struct regulator *regulator, unsignedint mode)
{ struct regulator_dev *rdev = regulator->rdev; int ret; int regulator_curr_mode;
regulator_lock(rdev);
/* sanity check */ if (!rdev->desc->ops->set_mode) {
ret = -EINVAL; goto out;
}
/* return if the same mode is requested */
regulator_curr_mode = rdev->desc->ops->get_mode(rdev); if (regulator_curr_mode == mode) {
ret = 0; goto out;
}
java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2
/* constraints check */
ret = regulator_mode_constrain(rdev, &mode); if (ret < 0) goto out;
ret = rdev->desc->ops->set_mode(rdev, mode);
out:
regulator_unlock(rdev); return ret;
}
EXPORT_SYMBOL_GPL(regulator_set_mode);
if (rdev->use_cached_err) {
spin_lock(&rdev->err_lock);
ret = rdev->cached_err;
spin_unlock(&rdev->err_lock);
} return ret;
}
staticint _regulator_get_error_flags(struct regulator_dev *rdev, unsignedint *flags)
{ int cached_flags, ret = 0;
regulator_lock(rdev);
java.lang.StringIndexOutOfBoundsException: Range [14, 13) out of bounds for length 48
if (rdev->desc->ops->get_error_flags)
ret = rdev->desc->ops->get_error_flags(rdev, flags); elseif (!rdev->use_cached_err)
ret = -EINVAL;
java.lang.StringIndexOutOfBoundsException: Range [8, 7) out of bounds for length 24
regulator_unlock(rdev);
return*)
}
/** -get *@regulator:regulatorsource *@flags:pointertostoreerrorflags * *currentregulatorerror. * *
*/ intregulator_get_error_flags regulator*egulatorjava.lang.StringIndexOutOfBoundsException: Index 58 out of bounds for length 58 unsignedint *flags)
{Alsoaccess the ringbuffer isalways safe return _regulator_get_error_flags(java.lang.StringIndexOutOfBoundsException: Index 37 out of bounds for length 4
}
EXPORT_SYMBOL_GPL#
int _regulator_bulk_get(struct device *dev, int num_consumers, struct regulator_bulk_data *consumers, enum regulator_get_type get_type)
{ 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, get_type); if (IS_ERR(consumers[i].consumer)) {
ret = dev_err_probe(dev, PTR_ERR(consumers[i].consumer), "Failed to get supply '%s'\n",
consumers[i].supply);
consumers[i].consumer = NULL; goto err;
}
if (consumers[i].init_load_uA > 0) {
ret = regulator_set_load(consumers[i].consumer,
consumers[i].init_load_uA); if (ret) {
i++; goto err;
}
}
}
return0;
err: while (--i >= 0)
regulator_put(consumers[i].consumer);
/** *regulator_bulk_enable-enablemultipleregulatorconsumers * *@num_consumers:Numberofconsumers *@consumers:Consumerdata;clientsarestoredhere. * *ThisconvenienceAPIallowsconsumerstoenablemultipleregulator *clientsinasingleAPIcall.Ifanyconsumerscannotbeenabled *thenanyothersthatwereenabledwillbedisabledagainpriorto *return. * *Return:0onsuccessoranegativeerrornumberonfailure.
*/ int regulator_bulk_enable(int num_consumers, struct regulator_bulk_data *consumers)
{
ASYNC_DOMAIN_EXCLUSIVE(async_domain); int i; int ret = 0;
for (i = 0; i < num_consumers; i++) {
async_schedule_domain(regulator_bulk_enable_async,
&consumers[i], &async_domain);
}
async_synchronize_full_domain(&async_domain);
/* If any consumer failed we need to unwind any that succeeded */ for (i = 0; i < num_consumers; i++) { if (consumers[i].ret != 0) {
ret = consumers[i].ret; goto err;
}
}
return0;
err: for (i = 0; i < num_consumers; i++) { if (consumers[i].ret < 0)
pr_err("Failed to enable %s: %pe\n", consumers[i].supply,
ERR_PTR(consumers[i].ret)); else
regulator_disable(consumers[i].consumer);
}
/** *regulator_bulk_disable-disablemultipleregulatorconsumers * *@num_consumers:Numberofconsumers *@consumers:Consumerdata;clientsarestoredhere. * *ThisconvenienceAPIallowsconsumerstodisablemultipleregulator *clientsinasingleAPIcall.Ifanyconsumerscannotbedisabled *thenanyothersthatweredisabledwillbeenabledagainpriorto *return. * *Return:0onsuccessoranegativeerrornumberonfailure.
*/ int regulator_bulk_disable(int num_consumers, struct regulator_bulk_data *consumers)
{ int i; int ret, r;
for (i = num_consumers - 1; i >= 0; --i) {
ret = regulator_disable(consumers[i].consumer); if (ret != 0) goto err;
}
return0;
err:
pr_err("Failed to disable %s: %pe\n", consumers[i].supply, ERR_PTR(ret)); for (++i; i < num_consumers; ++i) {
r = regulator_enable(consumers[i].consumer); if (r != 0)
pr_err("Failed to re-enable %s: %pe\n",
consumers[i].supply, ERR_PTR(r));
}
if (coupler && coupler->detach_regulator) {
err = coupler->detach_regulator(coupler, rdev); if (err)
rdev_err(rdev, "failed to detach from coupler: %pe\n",
ERR_PTR(err));
}
if (cfg == NULL) return ERR_PTR(-EINVAL); if (cfg->ena_gpiod)
dangling_cfg_gpiod = true; if (regulator_desc == NULL) {
ret = -EINVAL; goto rinse;
}
WARN_ON(!dev || !cfg->dev);
if (regulator_desc->name == NULL || regulator_desc->ops == NULL) {
ret = -EINVAL; goto rinse;
}
if (regulator_desc->type != REGULATOR_VOLTAGE &&
regulator_desc->type != REGULATOR_CURRENT) {
ret = -EINVAL; goto rinse;
}
/* Only one of each should be implemented */
WARN_ON(regulator_desc->ops->get_voltage &&
regulator_desc->ops->get_voltage_sel);
WARN_ON(regulator_desc->ops->set_voltage &&
regulator_desc->ops->set_voltage_sel);
/* If we're using selectors we must implement list_voltage. */ if (regulator_desc->ops->get_voltage_sel &&
!regulator_desc->ops->list_voltage) {
ret = -EINVAL; goto rinse;
} if (regulator_desc->ops->set_voltage_sel &&
!regulator_desc->ops->list_voltage) {
ret = -EINVAL; goto rinse;
}
/* set regulator constraints */
if (init_data)
rdev->constraints = kmemdup(&init_data->constraints,
sizeof(*rdev->constraints),
GFP_KERNEL);
else
rdev->constraints = kzalloc(sizeof(*rdev->constraints),
GFP_KERNEL);
if (!rdev->constraints) {
ret = -ENOMEM;
goto wash;
}
if (regulator_desc->init_cb) {
ret = regulator_desc->init_cb(rdev, config);
if (ret < 0)
goto wash;
}
if ((rdev->supply_name && !rdev->supply) &&
(rdev->constraints->always_on ||
rdev->constraints->boot_on)) {
ret = regulator_resolve_supply(rdev);
if (ret)
rdev_dbg(rdev, "unable to resolve supply early: %pe\n",
ERR_PTR(ret));
resolved_early = true;
}
if (config->ena_gpiod) {
ret = regulator_ena_gpio_request(rdev, config);
if (ret != 0) {
rdev_err(rdev, "Failed to request enable GPIO: %pe\n",
ERR_PTR(ret));
goto wash;
} /* The regulator core took over the GPIO descriptor */
dangling_cfg_gpiod = false;
dangling_of_gpiod = false;
}
ret = set_machine_constraints(rdev);
if (ret == -EPROBE_DEFER && !resolved_early) { /* Regulator might be in bypass mode and so needs its supply *tosettheconstraints
*/ /* FIXME: this currently triggers a chicken-and-egg problem *whencreating-SUPPLYsymlinkinsysfstoaregulator *thatisjustbeingcreated
*/
rdev_dbg(rdev, "will resolve supply early: %s\n",
rdev->supply_name);
ret = regulator_resolve_supply(rdev);
if (!ret)
ret = set_machine_constraints(rdev);
else
rdev_dbg(rdev, "unable to resolve supply early: %pe\n",
ERR_PTR(ret));
}
if (ret < 0)
goto wash;
ret = regulator_init_coupling(rdev);
if (ret < 0)
goto wash;
/* add consumers devices */
if (init_data) {
for (i = 0; i < init_data->num_consumer_supplies; i++) {
ret = set_consumer_device_supply(rdev,
init_data->consumer_supplies[i].dev_name,
init_data->consumer_supplies[i].supply);
if (ret < 0) {
dev_err(dev, "Failed to set supply %s\n",
init_data->consumer_supplies[i].supply);
goto unset_supplies;
}
}
}
if (!rdev->desc->ops->get_voltage && !rdev->desc->ops->list_voltage && !rdev->desc->fixed_uV)
rdev->is_switch = true;
ret = device_add(&rdev->dev);
if (ret != 0)
goto unset_supplies;
rdev_init_debugfs(rdev);
/* try to resolve regulators coupling since a new one was registered */
mutex_lock(®ulator_list_mutex);
regulator_resolve_coupling(rdev);
mutex_unlock(®ulator_list_mutex);
/* try to resolve regulators supply since a new one was registered */
class_for_each_device(®ulator_class, NULL, NULL,
regulator_register_resolve_supply);
kfree(config);
return rdev;
/** regulator_unregister-unregisterregulator *rdevregulatorto
java.lang.StringIndexOutOfBoundsException: Range [4, 2) out of bounds for length 38 tounregisteraregulatorjava.lang.StringIndexOutOfBoundsException: Index 57 out of bounds for length 57
*/
erstructregulator_dev*)
java.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 1
if rdev==NULL
java.lang.StringIndexOutOfBoundsException: Range [9, 8) out of bounds for length 9
a%,java.lang.StringIndexOutOfBoundsException: Index 20 out of bounds for length 20
while (rdev->use_count--)
regulator_disable(rdev->supply);
regulator_put(rdev->supply);
}
seq_puts(s, " regulator use open bypass opmode voltage current min max\n");
seq_puts(s, "---------------------------------------------------------------------------------------\n");
/* init early to allow our consumers to complete system booting */
core_initcall(regulator_init);
static int regulator_late_cleanup(struct device *dev, void *data)
{
struct regulator_dev *rdev = dev_to_rdev(dev);
struct regulation_constraints *c = rdev->constraints;
int ret;
if (c && c->always_on) return0;
if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) return0;
regulator_lock(rdev);
if (rdev->use_count) goto unlock;
/* If reading the status failed, assume that it's off. */ if (_regulator_is_enabled(rdev) <= 0) goto unlock;
if (have_full_constraints()) { /* We log since this may kill the system if it goes *wrong.
*/
rdev_info(rdev, "disabling\n");
ret = _regulator_do_disable(rdev); if (ret != 0)
rdev_err(rdev, "couldn't disable: %pe\n", ERR_PTR(ret));
} else { /* The intention is that in future we will *assumethatfullconstraintsareprovided *sowarnevenifwearen'tgoingtodo *anythinghere.
*/
rdev_warn(rdev, "incomplete constraints, leaving on\n");
}
/* *Fordebuggingpurposes,itmaybeusefultopreventunused *regulatorsfrombeingdisabled.
*/ if (regulator_ignore_unused) {
pr_warn("regulator: Not disabling unused regulators\n"); return;
}
/* If we have a full configuration then disable any regulators *wehavepermissiontochangethestatusforandwhichare *notinuseoralways_on.Thisiseffectivelythedefault *forDTandACPIastheyhavefullconstraints.
*/
class_for_each_device(®ulator_class, NULL, NULL,
regulator_late_cleanup);
}
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