static LIST_HEAD(regulator_list);
static LIST_HEAD(regulator_map_list);
static LIST_HEAD(regulator_ena_gpio_list);
+static LIST_HEAD(regulator_supply_alias_list);
static bool has_full_constraints;
static bool board_wants_dummy_regulator;
unsigned int ena_gpio_invert:1;
};
+/*
+ * struct regulator_supply_alias
+ *
+ * Used to map lookups for a supply onto an alternative device.
+ */
+struct regulator_supply_alias {
+ struct list_head list;
+ struct device *src_dev;
+ const char *src_supply;
+ struct device *alias_dev;
+ const char *alias_supply;
+};
+
static int _regulator_is_enabled(struct regulator_dev *rdev);
static int _regulator_disable(struct regulator_dev *rdev);
static int _regulator_get_voltage(struct regulator_dev *rdev);
return 0;
}
+static int machine_constraints_current(struct regulator_dev *rdev,
+ struct regulation_constraints *constraints)
+{
+ struct regulator_ops *ops = rdev->desc->ops;
+ int ret;
+
+ if (!constraints->min_uA && !constraints->max_uA)
+ return 0;
+
+ 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");
+ return 0;
+ }
+
+ /* 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;
+ }
+
+ return 0;
+}
+
/**
* set_machine_constraints - sets regulator constraints
* @rdev: regulator source
if (ret != 0)
goto out;
+ ret = machine_constraints_current(rdev, rdev->constraints);
+ if (ret != 0)
+ goto out;
+
/* do we need to setup our suspend state */
if (rdev->constraints->initial_state) {
ret = suspend_prepare(rdev, rdev->constraints->initial_state);
static int _regulator_get_enable_time(struct regulator_dev *rdev)
{
+ if (rdev->constraints && rdev->constraints->enable_time)
+ return rdev->constraints->enable_time;
if (!rdev->desc->ops->enable_time)
return rdev->desc->enable_time;
return rdev->desc->ops->enable_time(rdev);
}
+static struct regulator_supply_alias *regulator_find_supply_alias(
+ struct device *dev, const char *supply)
+{
+ struct regulator_supply_alias *map;
+
+ list_for_each_entry(map, ®ulator_supply_alias_list, list)
+ if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0)
+ return map;
+
+ return NULL;
+}
+
+static void regulator_supply_alias(struct device **dev, const char **supply)
+{
+ struct regulator_supply_alias *map;
+
+ map = regulator_find_supply_alias(*dev, *supply);
+ if (map) {
+ dev_dbg(*dev, "Mapping supply %s to %s,%s\n",
+ *supply, map->alias_supply,
+ dev_name(map->alias_dev));
+ *dev = map->alias_dev;
+ *supply = map->alias_supply;
+ }
+}
+
static struct regulator_dev *regulator_dev_lookup(struct device *dev,
const char *supply,
int *ret)
struct regulator_map *map;
const char *devname = NULL;
+ regulator_supply_alias(&dev, &supply);
+
/* first do a dt based lookup */
if (dev && dev->of_node) {
node = of_get_regulator(dev, supply);
if (id == NULL) {
pr_err("get() with no identifier\n");
- return regulator;
+ return ERR_PTR(-EINVAL);
}
if (dev)
}
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.
+ */
+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;
+
+ map->src_dev = dev;
+ map->src_supply = id;
+ map->alias_dev = alias_dev;
+ map->alias_supply = alias_id;
+
+ list_add(&map->list, ®ulator_supply_alias_list);
+
+ pr_info("Adding alias for supply %s,%s -> %s,%s\n",
+ id, dev_name(dev), alias_id, dev_name(alias_dev));
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(regulator_register_supply_alias);
+
+/**
+ * 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;
+
+ map = regulator_find_supply_alias(dev, id);
+ if (map) {
+ list_del(&map->list);
+ kfree(map);
+ }
+}
+EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias);
+
+/**
+ * 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
+ *
+ * @return 0 on success, an errno on failure.
+ *
+ * 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.
+ */
+int regulator_bulk_register_supply_alias(struct device *dev, const char **id,
+ struct device *alias_dev,
+ const char **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]);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias);
+
+/**
+ * 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 **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)
* together. */
trace_regulator_enable_delay(rdev_get_name(rdev));
- if (delay >= 1000) {
- mdelay(delay / 1000);
- udelay(delay % 1000);
- } else if (delay) {
- udelay(delay);
+ /*
+ * Delay for the requested amount of time as per the guidelines in:
+ *
+ * Documentation/timers/timers-howto.txt
+ *
+ * The assumption here is that regulators will never be enabled in
+ * atomic context and therefore sleeping functions can be used.
+ */
+ if (delay) {
+ unsigned int ms = delay / 1000;
+ unsigned int us = delay % 1000;
+
+ if (ms > 0) {
+ /*
+ * For small enough values, handle super-millisecond
+ * delays in the usleep_range() call below.
+ */
+ if (ms < 20)
+ us += ms * 1000;
+ else
+ msleep(ms);
+ }
+
+ /*
+ * Give the scheduler some room to coalesce with any other
+ * wakeup sources. For delays shorter than 10 us, don't even
+ * bother setting up high-resolution timers and just busy-
+ * loop.
+ */
+ if (us >= 10)
+ usleep_range(us, us + 100);
+ else
+ udelay(us);
}
trace_regulator_enable_complete(rdev_get_name(rdev));
ret = rdev->desc->ops->get_voltage(rdev);
} else if (rdev->desc->ops->list_voltage) {
ret = rdev->desc->ops->list_voltage(rdev, 0);
+ } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) {
+ ret = rdev->desc->fixed_uV;
} else {
return -EINVAL;
}
/* some attributes need specific methods to be displayed */
if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
(ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) ||
- (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0)) {
+ (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) ||
+ (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1))) {
status = device_create_file(dev, &dev_attr_microvolts);
if (status < 0)
return status;
projects / karo-tx-linux.git / blobdiff