The incoming stpmic1 regulator driver makes use of these helpers
internally. Thus port them out of Linux v5.3.
Signed-off-by: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>
Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
---
drivers/regulator/helpers.c | 186 ++++++++++++++++++++++++++++++++++++
include/regulator.h | 46 +++++++++
2 files changed, 232 insertions(+)
diff --git a/drivers/regulator/helpers.c b/drivers/regulator/helpers.c
index f22d21b35d93..c4877cecf7e9 100644
--- a/drivers/regulator/helpers.c
+++ b/drivers/regulator/helpers.c
@@ -184,3 +184,189 @@ int regulator_list_voltage_linear(struct regulator_dev *rdev,
return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
}
EXPORT_SYMBOL_GPL(regulator_list_voltage_linear);
+
+/**
+ * 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)
+{
+ const struct regulator_linear_range *range;
+ int i;
+
+ if (!desc->n_linear_ranges) {
+ BUG_ON(!desc->n_linear_ranges);
+ return -EINVAL;
+ }
+
+ for (i = 0; i < desc->n_linear_ranges; i++) {
+ range = &desc->linear_ranges[i];
+
+ if (!(selector >= range->min_sel &&
+ selector <= range->max_sel))
+ continue;
+
+ selector -= range->min_sel;
+
+ return range->min_uV + (range->uV_step * selector);
+ }
+
+ return -EINVAL;
+}
+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_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 regulator_linear_range *range;
+ int ret = -EINVAL;
+ 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++) {
+ int linear_max_uV;
+
+ range = &rdev->desc->linear_ranges[i];
+ linear_max_uV = range->min_uV +
+ (range->max_sel - range->min_sel) * range->uV_step;
+
+ if (!(min_uV <= linear_max_uV && max_uV >= range->min_uV))
+ continue;
+
+ if (min_uV <= range->min_uV)
+ min_uV = range->min_uV;
+
+ /* range->uV_step == 0 means fixed voltage range */
+ if (range->uV_step == 0) {
+ ret = 0;
+ } else {
+ ret = DIV_ROUND_UP(min_uV - range->min_uV,
+ range->uV_step);
+ if (ret < 0)
+ return ret;
+ }
+
+ ret += range->min_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, ret);
+ 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_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_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);
+
+
diff --git a/include/regulator.h b/include/regulator.h
index 28ae25652a43..156acb82f8df 100644
--- a/include/regulator.h
+++ b/include/regulator.h
@@ -32,6 +32,7 @@ struct regulator;
* @enable_is_inverted: A flag to indicate set enable_mask bits to disable
* when using regulator_enable_regmap and friends APIs.
*/
+
struct regulator_desc {
unsigned n_voltages;
const struct regulator_ops *ops;
@@ -49,6 +50,9 @@ struct regulator_desc {
unsigned int enable_val;
unsigned int disable_val;
bool enable_is_inverted;
+
+ const struct regulator_linear_range *linear_ranges;
+ int n_linear_ranges;
};
struct regulator_dev {
@@ -65,8 +69,36 @@ struct regulator_ops {
int (*list_voltage) (struct regulator_dev *, unsigned int);
int (*set_voltage_sel) (struct regulator_dev *, unsigned int);
+ int (*map_voltage)(struct regulator_dev *, int min_uV, int max_uV);
+};
+
+/*
+ * struct regulator_linear_range - specify linear voltage ranges
+ *
+ * Specify a range of voltages for regulator_map_linear_range() and
+ * regulator_list_linear_range().
+ *
+ * @min_uV: Lowest voltage in range
+ * @min_sel: Lowest selector for range
+ * @max_sel: Highest selector for range
+ * @uV_step: Step size
+ */
+struct regulator_linear_range {
+ unsigned int min_uV;
+ unsigned int min_sel;
+ unsigned int max_sel;
+ unsigned int uV_step;
};
+/* Initialize struct regulator_linear_range */
+#define REGULATOR_LINEAR_RANGE(_min_uV, _min_sel, _max_sel, _step_uV) \
+{ \
+ .min_uV = _min_uV, \
+ .min_sel = _min_sel, \
+ .max_sel = _max_sel, \
+ .uV_step = _step_uV, \
+}
+
#ifdef CONFIG_OFDEVICE
int of_regulator_register(struct regulator_dev *rd, struct device_node *node);
#else
@@ -93,8 +125,22 @@ int regulator_set_voltage_sel_regmap(struct regulator_dev *, unsigned);
int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV);
int regulator_map_voltage_linear(struct regulator_dev *rdev,
int min_uV, int max_uV);
+int regulator_map_voltage_linear_range(struct regulator_dev *rdev,
+ int min_uV, int max_uV);
int regulator_list_voltage_linear(struct regulator_dev *rdev,
unsigned int selector);
+int regulator_list_voltage_linear_range(struct regulator_dev *rdev,
+ unsigned int selector);
+int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev);
+int regulator_map_voltage_iterate(struct regulator_dev *rdev,
+ int min_uV, int max_uV);
+
+/*
+ * Helper functions intended to be used by regulator drivers prior registering
+ * their regulators.
+ */
+int regulator_desc_list_voltage_linear_range(const struct regulator_desc *desc,
+ unsigned int selector);
#else
static inline struct regulator *regulator_get(struct device_d *dev, const char *id)
--
2.24.0.rc1
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