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-rw-r--r--drivers/regulator/helpers.c968
1 files changed, 968 insertions, 0 deletions
diff --git a/drivers/regulator/helpers.c b/drivers/regulator/helpers.c
new file mode 100644
index 000000000..ad2237a95
--- /dev/null
+++ b/drivers/regulator/helpers.c
@@ -0,0 +1,968 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+//
+// helpers.c -- Voltage/Current Regulator framework helper functions.
+//
+// Copyright 2007, 2008 Wolfson Microelectronics PLC.
+// Copyright 2008 SlimLogic Ltd.
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/delay.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/regulator/driver.h>
+#include <linux/module.h>
+
+#include "internal.h"
+
+/**
+ * regulator_is_enabled_regmap - standard is_enabled() for regmap users
+ *
+ * @rdev: regulator to operate on
+ *
+ * Regulators that use regmap for their register I/O can set the
+ * enable_reg and enable_mask fields in their descriptor and then use
+ * this as their is_enabled operation, saving some code.
+ */
+int regulator_is_enabled_regmap(struct regulator_dev *rdev)
+{
+ unsigned int val;
+ int ret;
+
+ ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val);
+ if (ret != 0)
+ return ret;
+
+ val &= rdev->desc->enable_mask;
+
+ if (rdev->desc->enable_is_inverted) {
+ if (rdev->desc->enable_val)
+ return val != rdev->desc->enable_val;
+ return val == 0;
+ } else {
+ if (rdev->desc->enable_val)
+ return val == rdev->desc->enable_val;
+ return val != 0;
+ }
+}
+EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap);
+
+/**
+ * regulator_enable_regmap - standard enable() for regmap users
+ *
+ * @rdev: regulator to operate on
+ *
+ * Regulators that use regmap for their register I/O can set the
+ * enable_reg and enable_mask fields in their descriptor and then use
+ * this as their enable() operation, saving some code.
+ */
+int regulator_enable_regmap(struct regulator_dev *rdev)
+{
+ unsigned int val;
+
+ if (rdev->desc->enable_is_inverted) {
+ val = rdev->desc->disable_val;
+ } else {
+ val = rdev->desc->enable_val;
+ if (!val)
+ val = rdev->desc->enable_mask;
+ }
+
+ return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
+ rdev->desc->enable_mask, val);
+}
+EXPORT_SYMBOL_GPL(regulator_enable_regmap);
+
+/**
+ * regulator_disable_regmap - standard disable() for regmap users
+ *
+ * @rdev: regulator to operate on
+ *
+ * Regulators that use regmap for their register I/O can set the
+ * enable_reg and enable_mask fields in their descriptor and then use
+ * this as their disable() operation, saving some code.
+ */
+int regulator_disable_regmap(struct regulator_dev *rdev)
+{
+ unsigned int val;
+
+ if (rdev->desc->enable_is_inverted) {
+ val = rdev->desc->enable_val;
+ if (!val)
+ val = rdev->desc->enable_mask;
+ } else {
+ val = rdev->desc->disable_val;
+ }
+
+ return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
+ rdev->desc->enable_mask, val);
+}
+EXPORT_SYMBOL_GPL(regulator_disable_regmap);
+
+static int regulator_range_selector_to_index(struct regulator_dev *rdev,
+ unsigned int rval)
+{
+ int i;
+
+ if (!rdev->desc->linear_range_selectors)
+ return -EINVAL;
+
+ rval &= rdev->desc->vsel_range_mask;
+
+ for (i = 0; i < rdev->desc->n_linear_ranges; i++) {
+ if (rdev->desc->linear_range_selectors[i] == rval)
+ return i;
+ }
+ return -EINVAL;
+}
+
+/**
+ * regulator_get_voltage_sel_pickable_regmap - pickable range get_voltage_sel
+ *
+ * @rdev: regulator to operate on
+ *
+ * Regulators that use regmap for their register I/O and use pickable
+ * ranges can set the vsel_reg, vsel_mask, vsel_range_reg and vsel_range_mask
+ * fields in their descriptor and then use this as their get_voltage_vsel
+ * operation, saving some code.
+ */
+int regulator_get_voltage_sel_pickable_regmap(struct regulator_dev *rdev)
+{
+ unsigned int r_val;
+ int range;
+ unsigned int val;
+ int ret;
+ unsigned int voltages = 0;
+ const struct linear_range *r = rdev->desc->linear_ranges;
+
+ if (!r)
+ return -EINVAL;
+
+ ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
+ if (ret != 0)
+ return ret;
+
+ ret = regmap_read(rdev->regmap, rdev->desc->vsel_range_reg, &r_val);
+ if (ret != 0)
+ return ret;
+
+ val &= rdev->desc->vsel_mask;
+ val >>= ffs(rdev->desc->vsel_mask) - 1;
+
+ range = regulator_range_selector_to_index(rdev, r_val);
+ if (range < 0)
+ return -EINVAL;
+
+ voltages = linear_range_values_in_range_array(r, range);
+
+ return val + voltages;
+}
+EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_pickable_regmap);
+
+/**
+ * regulator_set_voltage_sel_pickable_regmap - pickable range set_voltage_sel
+ *
+ * @rdev: regulator to operate on
+ * @sel: Selector to set
+ *
+ * Regulators that use regmap for their register I/O and use pickable
+ * ranges can set the vsel_reg, vsel_mask, vsel_range_reg and vsel_range_mask
+ * fields in their descriptor and then use this as their set_voltage_vsel
+ * operation, saving some code.
+ */
+int regulator_set_voltage_sel_pickable_regmap(struct regulator_dev *rdev,
+ unsigned int sel)
+{
+ unsigned int range;
+ int ret, i;
+ unsigned int voltages_in_range = 0;
+
+ for (i = 0; i < rdev->desc->n_linear_ranges; i++) {
+ const struct linear_range *r;
+
+ r = &rdev->desc->linear_ranges[i];
+ voltages_in_range = linear_range_values_in_range(r);
+
+ if (sel < voltages_in_range)
+ break;
+ sel -= voltages_in_range;
+ }
+
+ if (i == rdev->desc->n_linear_ranges)
+ return -EINVAL;
+
+ sel <<= ffs(rdev->desc->vsel_mask) - 1;
+ sel += rdev->desc->linear_ranges[i].min_sel;
+
+ range = rdev->desc->linear_range_selectors[i];
+
+ if (rdev->desc->vsel_reg == rdev->desc->vsel_range_reg) {
+ ret = regmap_update_bits(rdev->regmap,
+ rdev->desc->vsel_reg,
+ rdev->desc->vsel_range_mask |
+ rdev->desc->vsel_mask, sel | range);
+ } else {
+ ret = regmap_update_bits(rdev->regmap,
+ rdev->desc->vsel_range_reg,
+ rdev->desc->vsel_range_mask, range);
+ if (ret)
+ return ret;
+
+ ret = regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
+ rdev->desc->vsel_mask, sel);
+ }
+
+ if (ret)
+ return ret;
+
+ if (rdev->desc->apply_bit)
+ ret = regmap_update_bits(rdev->regmap, rdev->desc->apply_reg,
+ rdev->desc->apply_bit,
+ rdev->desc->apply_bit);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_pickable_regmap);
+
+/**
+ * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users
+ *
+ * @rdev: regulator to operate on
+ *
+ * Regulators that use regmap for their register I/O can set the
+ * vsel_reg and vsel_mask fields in their descriptor and then use this
+ * as their get_voltage_vsel operation, saving some code.
+ */
+int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev)
+{
+ unsigned int val;
+ int ret;
+
+ ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
+ if (ret != 0)
+ return ret;
+
+ val &= rdev->desc->vsel_mask;
+ val >>= ffs(rdev->desc->vsel_mask) - 1;
+
+ return val;
+}
+EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap);
+
+/**
+ * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users
+ *
+ * @rdev: regulator to operate on
+ * @sel: Selector to set
+ *
+ * Regulators that use regmap for their register I/O can set the
+ * vsel_reg and vsel_mask fields in their descriptor and then use this
+ * as their set_voltage_vsel operation, saving some code.
+ */
+int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel)
+{
+ int ret;
+
+ sel <<= ffs(rdev->desc->vsel_mask) - 1;
+
+ ret = regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
+ rdev->desc->vsel_mask, sel);
+ if (ret)
+ return ret;
+
+ if (rdev->desc->apply_bit)
+ ret = regmap_update_bits(rdev->regmap, rdev->desc->apply_reg,
+ rdev->desc->apply_bit,
+ rdev->desc->apply_bit);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap);
+
+/**
+ * regulator_map_voltage_iterate - map_voltage() based on list_voltage()
+ *
+ * @rdev: Regulator to operate on
+ * @min_uV: Lower bound for voltage
+ * @max_uV: Upper bound for voltage
+ *
+ * Drivers implementing set_voltage_sel() and list_voltage() can use
+ * this as their map_voltage() operation. It will find a suitable
+ * voltage by calling list_voltage() until it gets something in bounds
+ * for the requested voltages.
+ */
+int regulator_map_voltage_iterate(struct regulator_dev *rdev,
+ int min_uV, int max_uV)
+{
+ int best_val = INT_MAX;
+ int selector = 0;
+ int i, ret;
+
+ /* 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 (best_val != INT_MAX)
+ return selector;
+ else
+ return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate);
+
+/**
+ * regulator_map_voltage_ascend - map_voltage() for ascendant voltage list
+ *
+ * @rdev: Regulator to operate on
+ * @min_uV: Lower bound for voltage
+ * @max_uV: Upper bound for voltage
+ *
+ * Drivers that have ascendant voltage list can use this as their
+ * map_voltage() operation.
+ */
+int regulator_map_voltage_ascend(struct regulator_dev *rdev,
+ int min_uV, int max_uV)
+{
+ int i, ret;
+
+ for (i = 0; i < rdev->desc->n_voltages; i++) {
+ ret = rdev->desc->ops->list_voltage(rdev, i);
+ if (ret < 0)
+ continue;
+
+ if (ret > max_uV)
+ break;
+
+ if (ret >= min_uV && ret <= max_uV)
+ return i;
+ }
+
+ return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(regulator_map_voltage_ascend);
+
+/**
+ * regulator_map_voltage_linear - map_voltage() for simple linear mappings
+ *
+ * @rdev: Regulator to operate on
+ * @min_uV: Lower bound for voltage
+ * @max_uV: Upper bound for voltage
+ *
+ * Drivers providing min_uV and uV_step in their regulator_desc can
+ * use this as their map_voltage() operation.
+ */
+int regulator_map_voltage_linear(struct regulator_dev *rdev,
+ int min_uV, int max_uV)
+{
+ int ret, voltage;
+
+ /* Allow uV_step to be 0 for fixed voltage */
+ if (rdev->desc->n_voltages == 1 && rdev->desc->uV_step == 0) {
+ if (min_uV <= rdev->desc->min_uV && rdev->desc->min_uV <= max_uV)
+ return 0;
+ else
+ return -EINVAL;
+ }
+
+ if (!rdev->desc->uV_step) {
+ BUG_ON(!rdev->desc->uV_step);
+ return -EINVAL;
+ }
+
+ if (min_uV < rdev->desc->min_uV)
+ min_uV = rdev->desc->min_uV;
+
+ ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
+ if (ret < 0)
+ return ret;
+
+ ret += rdev->desc->linear_min_sel;
+
+ /* Map back into a voltage to verify we're still in bounds */
+ voltage = rdev->desc->ops->list_voltage(rdev, ret);
+ if (voltage < min_uV || voltage > max_uV)
+ return -EINVAL;
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(regulator_map_voltage_linear);
+
+/**
+ * regulator_map_voltage_linear_range - map_voltage() for multiple linear ranges
+ *
+ * @rdev: Regulator to operate on
+ * @min_uV: Lower bound for voltage
+ * @max_uV: Upper bound for voltage
+ *
+ * Drivers providing linear_ranges in their descriptor can use this as
+ * their map_voltage() callback.
+ */
+int regulator_map_voltage_linear_range(struct regulator_dev *rdev,
+ int min_uV, int max_uV)
+{
+ const struct linear_range *range;
+ int ret = -EINVAL;
+ unsigned int sel;
+ bool found;
+ int voltage, i;
+
+ if (!rdev->desc->n_linear_ranges) {
+ BUG_ON(!rdev->desc->n_linear_ranges);
+ return -EINVAL;
+ }
+
+ for (i = 0; i < rdev->desc->n_linear_ranges; i++) {
+ range = &rdev->desc->linear_ranges[i];
+
+ ret = linear_range_get_selector_high(range, min_uV, &sel,
+ &found);
+ if (ret)
+ continue;
+ ret = sel;
+
+ /*
+ * Map back into a voltage to verify we're still in bounds.
+ * If we are not, then continue checking rest of the ranges.
+ */
+ voltage = rdev->desc->ops->list_voltage(rdev, sel);
+ if (voltage >= min_uV && voltage <= max_uV)
+ break;
+ }
+
+ if (i == rdev->desc->n_linear_ranges)
+ return -EINVAL;
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(regulator_map_voltage_linear_range);
+
+/**
+ * regulator_map_voltage_pickable_linear_range - map_voltage, pickable ranges
+ *
+ * @rdev: Regulator to operate on
+ * @min_uV: Lower bound for voltage
+ * @max_uV: Upper bound for voltage
+ *
+ * Drivers providing pickable linear_ranges in their descriptor can use
+ * this as their map_voltage() callback.
+ */
+int regulator_map_voltage_pickable_linear_range(struct regulator_dev *rdev,
+ int min_uV, int max_uV)
+{
+ const struct linear_range *range;
+ int ret = -EINVAL;
+ int voltage, i;
+ unsigned int selector = 0;
+
+ if (!rdev->desc->n_linear_ranges) {
+ BUG_ON(!rdev->desc->n_linear_ranges);
+ return -EINVAL;
+ }
+
+ for (i = 0; i < rdev->desc->n_linear_ranges; i++) {
+ int linear_max_uV;
+ bool found;
+ unsigned int sel;
+
+ range = &rdev->desc->linear_ranges[i];
+ linear_max_uV = linear_range_get_max_value(range);
+
+ if (!(min_uV <= linear_max_uV && max_uV >= range->min)) {
+ selector += linear_range_values_in_range(range);
+ continue;
+ }
+
+ ret = linear_range_get_selector_high(range, min_uV, &sel,
+ &found);
+ if (ret) {
+ selector += linear_range_values_in_range(range);
+ continue;
+ }
+
+ ret = selector + sel - range->min_sel;
+
+ voltage = rdev->desc->ops->list_voltage(rdev, ret);
+
+ /*
+ * Map back into a voltage to verify we're still in bounds.
+ * We may have overlapping voltage ranges. Hence we don't
+ * exit but retry until we have checked all ranges.
+ */
+ if (voltage < min_uV || voltage > max_uV)
+ selector += linear_range_values_in_range(range);
+ else
+ break;
+ }
+
+ if (i == rdev->desc->n_linear_ranges)
+ return -EINVAL;
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(regulator_map_voltage_pickable_linear_range);
+
+/**
+ * regulator_desc_list_voltage_linear - List voltages with simple calculation
+ *
+ * @desc: Regulator desc for regulator which volatges are to be listed
+ * @selector: Selector to convert into a voltage
+ *
+ * Regulators with a simple linear mapping between voltages and
+ * selectors can set min_uV and uV_step in the regulator descriptor
+ * and then use this function prior regulator registration to list
+ * the voltages. This is useful when voltages need to be listed during
+ * device-tree parsing.
+ */
+int regulator_desc_list_voltage_linear(const struct regulator_desc *desc,
+ unsigned int selector)
+{
+ if (selector >= desc->n_voltages)
+ return -EINVAL;
+
+ if (selector < desc->linear_min_sel)
+ return 0;
+
+ selector -= desc->linear_min_sel;
+
+ return desc->min_uV + (desc->uV_step * selector);
+}
+EXPORT_SYMBOL_GPL(regulator_desc_list_voltage_linear);
+
+/**
+ * regulator_list_voltage_linear - List voltages with simple calculation
+ *
+ * @rdev: Regulator device
+ * @selector: Selector to convert into a voltage
+ *
+ * Regulators with a simple linear mapping between voltages and
+ * selectors can set min_uV and uV_step in the regulator descriptor
+ * and then use this function as their list_voltage() operation,
+ */
+int regulator_list_voltage_linear(struct regulator_dev *rdev,
+ unsigned int selector)
+{
+ return regulator_desc_list_voltage_linear(rdev->desc, selector);
+}
+EXPORT_SYMBOL_GPL(regulator_list_voltage_linear);
+
+/**
+ * regulator_list_voltage_pickable_linear_range - pickable range list voltages
+ *
+ * @rdev: Regulator device
+ * @selector: Selector to convert into a voltage
+ *
+ * list_voltage() operation, intended to be used by drivers utilizing pickable
+ * ranges helpers.
+ */
+int regulator_list_voltage_pickable_linear_range(struct regulator_dev *rdev,
+ unsigned int selector)
+{
+ const struct linear_range *range;
+ int i;
+ unsigned int all_sels = 0;
+
+ if (!rdev->desc->n_linear_ranges) {
+ BUG_ON(!rdev->desc->n_linear_ranges);
+ return -EINVAL;
+ }
+
+ for (i = 0; i < rdev->desc->n_linear_ranges; i++) {
+ unsigned int sel_indexes;
+
+ range = &rdev->desc->linear_ranges[i];
+
+ sel_indexes = linear_range_values_in_range(range) - 1;
+
+ if (all_sels + sel_indexes >= selector) {
+ selector -= all_sels;
+ /*
+ * As we see here, pickable ranges work only as
+ * long as the first selector for each pickable
+ * range is 0, and the each subsequent range for
+ * this 'pick' follow immediately at next unused
+ * selector (Eg. there is no gaps between ranges).
+ * I think this is fine but it probably should be
+ * documented. OTOH, whole pickable range stuff
+ * might benefit from some documentation
+ */
+ return range->min + (range->step * selector);
+ }
+
+ all_sels += (sel_indexes + 1);
+ }
+
+ return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(regulator_list_voltage_pickable_linear_range);
+
+/**
+ * regulator_desc_list_voltage_linear_range - List voltages for linear ranges
+ *
+ * @desc: Regulator desc for regulator which volatges are to be listed
+ * @selector: Selector to convert into a voltage
+ *
+ * Regulators with a series of simple linear mappings between voltages
+ * and selectors who have set linear_ranges in the regulator descriptor
+ * can use this function prior regulator registration to list voltages.
+ * This is useful when voltages need to be listed during device-tree
+ * parsing.
+ */
+int regulator_desc_list_voltage_linear_range(const struct regulator_desc *desc,
+ unsigned int selector)
+{
+ unsigned int val;
+ int ret;
+
+ BUG_ON(!desc->n_linear_ranges);
+
+ ret = linear_range_get_value_array(desc->linear_ranges,
+ desc->n_linear_ranges, selector,
+ &val);
+ if (ret)
+ return ret;
+
+ return val;
+}
+EXPORT_SYMBOL_GPL(regulator_desc_list_voltage_linear_range);
+
+/**
+ * regulator_list_voltage_linear_range - List voltages for linear ranges
+ *
+ * @rdev: Regulator device
+ * @selector: Selector to convert into a voltage
+ *
+ * Regulators with a series of simple linear mappings between voltages
+ * and selectors can set linear_ranges in the regulator descriptor and
+ * then use this function as their list_voltage() operation,
+ */
+int regulator_list_voltage_linear_range(struct regulator_dev *rdev,
+ unsigned int selector)
+{
+ return regulator_desc_list_voltage_linear_range(rdev->desc, selector);
+}
+EXPORT_SYMBOL_GPL(regulator_list_voltage_linear_range);
+
+/**
+ * regulator_list_voltage_table - List voltages with table based mapping
+ *
+ * @rdev: Regulator device
+ * @selector: Selector to convert into a voltage
+ *
+ * Regulators with table based mapping between voltages and
+ * selectors can set volt_table in the regulator descriptor
+ * and then use this function as their list_voltage() operation.
+ */
+int regulator_list_voltage_table(struct regulator_dev *rdev,
+ unsigned int selector)
+{
+ if (!rdev->desc->volt_table) {
+ BUG_ON(!rdev->desc->volt_table);
+ return -EINVAL;
+ }
+
+ if (selector >= rdev->desc->n_voltages)
+ return -EINVAL;
+ if (selector < rdev->desc->linear_min_sel)
+ return 0;
+
+ return rdev->desc->volt_table[selector];
+}
+EXPORT_SYMBOL_GPL(regulator_list_voltage_table);
+
+/**
+ * regulator_set_bypass_regmap - Default set_bypass() using regmap
+ *
+ * @rdev: device to operate on.
+ * @enable: state to set.
+ */
+int regulator_set_bypass_regmap(struct regulator_dev *rdev, bool enable)
+{
+ unsigned int val;
+
+ if (enable) {
+ val = rdev->desc->bypass_val_on;
+ if (!val)
+ val = rdev->desc->bypass_mask;
+ } else {
+ val = rdev->desc->bypass_val_off;
+ }
+
+ return regmap_update_bits(rdev->regmap, rdev->desc->bypass_reg,
+ rdev->desc->bypass_mask, val);
+}
+EXPORT_SYMBOL_GPL(regulator_set_bypass_regmap);
+
+/**
+ * regulator_set_soft_start_regmap - Default set_soft_start() using regmap
+ *
+ * @rdev: device to operate on.
+ */
+int regulator_set_soft_start_regmap(struct regulator_dev *rdev)
+{
+ unsigned int val;
+
+ val = rdev->desc->soft_start_val_on;
+ if (!val)
+ val = rdev->desc->soft_start_mask;
+
+ return regmap_update_bits(rdev->regmap, rdev->desc->soft_start_reg,
+ rdev->desc->soft_start_mask, val);
+}
+EXPORT_SYMBOL_GPL(regulator_set_soft_start_regmap);
+
+/**
+ * regulator_set_pull_down_regmap - Default set_pull_down() using regmap
+ *
+ * @rdev: device to operate on.
+ */
+int regulator_set_pull_down_regmap(struct regulator_dev *rdev)
+{
+ unsigned int val;
+
+ val = rdev->desc->pull_down_val_on;
+ if (!val)
+ val = rdev->desc->pull_down_mask;
+
+ return regmap_update_bits(rdev->regmap, rdev->desc->pull_down_reg,
+ rdev->desc->pull_down_mask, val);
+}
+EXPORT_SYMBOL_GPL(regulator_set_pull_down_regmap);
+
+/**
+ * regulator_get_bypass_regmap - Default get_bypass() using regmap
+ *
+ * @rdev: device to operate on.
+ * @enable: current state.
+ */
+int regulator_get_bypass_regmap(struct regulator_dev *rdev, bool *enable)
+{
+ unsigned int val;
+ unsigned int val_on = rdev->desc->bypass_val_on;
+ int ret;
+
+ ret = regmap_read(rdev->regmap, rdev->desc->bypass_reg, &val);
+ if (ret != 0)
+ return ret;
+
+ if (!val_on)
+ val_on = rdev->desc->bypass_mask;
+
+ *enable = (val & rdev->desc->bypass_mask) == val_on;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(regulator_get_bypass_regmap);
+
+/**
+ * regulator_set_active_discharge_regmap - Default set_active_discharge()
+ * using regmap
+ *
+ * @rdev: device to operate on.
+ * @enable: state to set, 0 to disable and 1 to enable.
+ */
+int regulator_set_active_discharge_regmap(struct regulator_dev *rdev,
+ bool enable)
+{
+ unsigned int val;
+
+ if (enable)
+ val = rdev->desc->active_discharge_on;
+ else
+ val = rdev->desc->active_discharge_off;
+
+ return regmap_update_bits(rdev->regmap,
+ rdev->desc->active_discharge_reg,
+ rdev->desc->active_discharge_mask, val);
+}
+EXPORT_SYMBOL_GPL(regulator_set_active_discharge_regmap);
+
+/**
+ * regulator_set_current_limit_regmap - set_current_limit for regmap users
+ *
+ * @rdev: regulator to operate on
+ * @min_uA: Lower bound for current limit
+ * @max_uA: Upper bound for current limit
+ *
+ * Regulators that use regmap for their register I/O can set curr_table,
+ * csel_reg and csel_mask fields in their descriptor and then use this
+ * as their set_current_limit operation, saving some code.
+ */
+int regulator_set_current_limit_regmap(struct regulator_dev *rdev,
+ int min_uA, int max_uA)
+{
+ unsigned int n_currents = rdev->desc->n_current_limits;
+ int i, sel = -1;
+
+ if (n_currents == 0)
+ return -EINVAL;
+
+ if (rdev->desc->curr_table) {
+ const unsigned int *curr_table = rdev->desc->curr_table;
+ bool ascend = curr_table[n_currents - 1] > curr_table[0];
+
+ /* search for closest to maximum */
+ if (ascend) {
+ for (i = n_currents - 1; i >= 0; i--) {
+ if (min_uA <= curr_table[i] &&
+ curr_table[i] <= max_uA) {
+ sel = i;
+ break;
+ }
+ }
+ } else {
+ for (i = 0; i < n_currents; i++) {
+ if (min_uA <= curr_table[i] &&
+ curr_table[i] <= max_uA) {
+ sel = i;
+ break;
+ }
+ }
+ }
+ }
+
+ if (sel < 0)
+ return -EINVAL;
+
+ sel <<= ffs(rdev->desc->csel_mask) - 1;
+
+ return regmap_update_bits(rdev->regmap, rdev->desc->csel_reg,
+ rdev->desc->csel_mask, sel);
+}
+EXPORT_SYMBOL_GPL(regulator_set_current_limit_regmap);
+
+/**
+ * regulator_get_current_limit_regmap - get_current_limit for regmap users
+ *
+ * @rdev: regulator to operate on
+ *
+ * Regulators that use regmap for their register I/O can set the
+ * csel_reg and csel_mask fields in their descriptor and then use this
+ * as their get_current_limit operation, saving some code.
+ */
+int regulator_get_current_limit_regmap(struct regulator_dev *rdev)
+{
+ unsigned int val;
+ int ret;
+
+ ret = regmap_read(rdev->regmap, rdev->desc->csel_reg, &val);
+ if (ret != 0)
+ return ret;
+
+ val &= rdev->desc->csel_mask;
+ val >>= ffs(rdev->desc->csel_mask) - 1;
+
+ if (rdev->desc->curr_table) {
+ if (val >= rdev->desc->n_current_limits)
+ return -EINVAL;
+
+ return rdev->desc->curr_table[val];
+ }
+
+ return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(regulator_get_current_limit_regmap);
+
+/**
+ * regulator_bulk_set_supply_names - initialize the 'supply' fields in an array
+ * of regulator_bulk_data structs
+ *
+ * @consumers: array of regulator_bulk_data entries to initialize
+ * @supply_names: array of supply name strings
+ * @num_supplies: number of supply names to initialize
+ *
+ * Note: the 'consumers' array must be the size of 'num_supplies'.
+ */
+void regulator_bulk_set_supply_names(struct regulator_bulk_data *consumers,
+ const char *const *supply_names,
+ unsigned int num_supplies)
+{
+ unsigned int i;
+
+ for (i = 0; i < num_supplies; i++)
+ consumers[i].supply = supply_names[i];
+}
+EXPORT_SYMBOL_GPL(regulator_bulk_set_supply_names);
+
+/**
+ * regulator_is_equal - test whether two regulators are the same
+ *
+ * @reg1: first regulator to operate on
+ * @reg2: second regulator to operate on
+ */
+bool regulator_is_equal(struct regulator *reg1, struct regulator *reg2)
+{
+ return reg1->rdev == reg2->rdev;
+}
+EXPORT_SYMBOL_GPL(regulator_is_equal);
+
+static int find_closest_bigger(unsigned int target, const unsigned int *table,
+ unsigned int num_sel, unsigned int *sel)
+{
+ unsigned int s, tmp, max, maxsel = 0;
+ bool found = false;
+
+ max = table[0];
+
+ for (s = 0; s < num_sel; s++) {
+ if (table[s] > max) {
+ max = table[s];
+ maxsel = s;
+ }
+ if (table[s] >= target) {
+ if (!found || table[s] - target < tmp - target) {
+ tmp = table[s];
+ *sel = s;
+ found = true;
+ if (tmp == target)
+ break;
+ }
+ }
+ }
+
+ if (!found) {
+ *sel = maxsel;
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/**
+ * regulator_set_ramp_delay_regmap - set_ramp_delay() helper
+ *
+ * @rdev: regulator to operate on
+ *
+ * Regulators that use regmap for their register I/O can set the ramp_reg
+ * and ramp_mask fields in their descriptor and then use this as their
+ * set_ramp_delay operation, saving some code.
+ */
+int regulator_set_ramp_delay_regmap(struct regulator_dev *rdev, int ramp_delay)
+{
+ int ret;
+ unsigned int sel;
+
+ if (WARN_ON(!rdev->desc->n_ramp_values || !rdev->desc->ramp_delay_table))
+ return -EINVAL;
+
+ ret = find_closest_bigger(ramp_delay, rdev->desc->ramp_delay_table,
+ rdev->desc->n_ramp_values, &sel);
+
+ if (ret) {
+ dev_warn(rdev_get_dev(rdev),
+ "Can't set ramp-delay %u, setting %u\n", ramp_delay,
+ rdev->desc->ramp_delay_table[sel]);
+ }
+
+ sel <<= ffs(rdev->desc->ramp_mask) - 1;
+
+ return regmap_update_bits(rdev->regmap, rdev->desc->ramp_reg,
+ rdev->desc->ramp_mask, sel);
+}
+EXPORT_SYMBOL_GPL(regulator_set_ramp_delay_regmap);