Reduce the size of core.c a bit. Signed-off-by: Mark Brown <broonie@linaro.org>tirimbino
Mark Brown
12 years ago
parent
eca2a654b8
commit
c4a54b8d54
@ -0,0 +1,361 @@ |
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/*
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* helpers.c -- Voltage/Current Regulator framework helper functions. |
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* |
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* Copyright 2007, 2008 Wolfson Microelectronics PLC. |
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* Copyright 2008 SlimLogic Ltd. |
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* |
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* This program is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License as published by the |
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* Free Software Foundation; either version 2 of the License, or (at your |
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* option) any later version. |
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* |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/err.h> |
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#include <linux/delay.h> |
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#include <linux/regmap.h> |
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#include <linux/regulator/consumer.h> |
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#include <linux/regulator/driver.h> |
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#include <linux/module.h> |
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/**
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* regulator_is_enabled_regmap - standard is_enabled() for regmap users |
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* |
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* @rdev: regulator to operate on |
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* |
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* Regulators that use regmap for their register I/O can set the |
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* enable_reg and enable_mask fields in their descriptor and then use |
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* this as their is_enabled operation, saving some code. |
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*/ |
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int regulator_is_enabled_regmap(struct regulator_dev *rdev) |
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{ |
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unsigned int val; |
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int ret; |
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ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val); |
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if (ret != 0) |
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return ret; |
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if (rdev->desc->enable_is_inverted) |
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return (val & rdev->desc->enable_mask) == 0; |
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else |
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return (val & rdev->desc->enable_mask) != 0; |
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} |
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EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap); |
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/**
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* regulator_enable_regmap - standard enable() for regmap users |
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* |
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* @rdev: regulator to operate on |
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* |
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* Regulators that use regmap for their register I/O can set the |
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* enable_reg and enable_mask fields in their descriptor and then use |
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* this as their enable() operation, saving some code. |
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*/ |
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int regulator_enable_regmap(struct regulator_dev *rdev) |
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{ |
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unsigned int val; |
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if (rdev->desc->enable_is_inverted) |
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val = 0; |
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else |
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val = rdev->desc->enable_mask; |
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return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, |
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rdev->desc->enable_mask, val); |
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} |
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EXPORT_SYMBOL_GPL(regulator_enable_regmap); |
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/**
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* regulator_disable_regmap - standard disable() for regmap users |
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* |
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* @rdev: regulator to operate on |
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* |
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* Regulators that use regmap for their register I/O can set the |
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* enable_reg and enable_mask fields in their descriptor and then use |
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* this as their disable() operation, saving some code. |
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*/ |
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int regulator_disable_regmap(struct regulator_dev *rdev) |
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{ |
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unsigned int val; |
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if (rdev->desc->enable_is_inverted) |
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val = rdev->desc->enable_mask; |
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else |
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val = 0; |
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return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, |
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rdev->desc->enable_mask, val); |
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} |
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EXPORT_SYMBOL_GPL(regulator_disable_regmap); |
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/**
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* regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users |
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* |
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* @rdev: regulator to operate on |
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* |
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* Regulators that use regmap for their register I/O can set the |
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* vsel_reg and vsel_mask fields in their descriptor and then use this |
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* as their get_voltage_vsel operation, saving some code. |
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*/ |
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int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev) |
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{ |
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unsigned int val; |
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int ret; |
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ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val); |
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if (ret != 0) |
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return ret; |
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val &= rdev->desc->vsel_mask; |
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val >>= ffs(rdev->desc->vsel_mask) - 1; |
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return val; |
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} |
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EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap); |
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/**
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* regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users |
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* |
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* @rdev: regulator to operate on |
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* @sel: Selector to set |
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* |
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* Regulators that use regmap for their register I/O can set the |
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* vsel_reg and vsel_mask fields in their descriptor and then use this |
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* as their set_voltage_vsel operation, saving some code. |
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*/ |
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int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel) |
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{ |
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int ret; |
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sel <<= ffs(rdev->desc->vsel_mask) - 1; |
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ret = regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg, |
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rdev->desc->vsel_mask, sel); |
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if (ret) |
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return ret; |
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if (rdev->desc->apply_bit) |
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ret = regmap_update_bits(rdev->regmap, rdev->desc->apply_reg, |
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rdev->desc->apply_bit, |
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rdev->desc->apply_bit); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap); |
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/**
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* regulator_map_voltage_iterate - map_voltage() based on list_voltage() |
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* |
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* @rdev: Regulator to operate on |
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* @min_uV: Lower bound for voltage |
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* @max_uV: Upper bound for voltage |
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* |
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* Drivers implementing set_voltage_sel() and list_voltage() can use |
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* this as their map_voltage() operation. It will find a suitable |
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* voltage by calling list_voltage() until it gets something in bounds |
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* for the requested voltages. |
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*/ |
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int regulator_map_voltage_iterate(struct regulator_dev *rdev, |
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int min_uV, int max_uV) |
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{ |
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int best_val = INT_MAX; |
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int selector = 0; |
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int i, ret; |
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/* Find the smallest voltage that falls within the specified
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* range. |
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*/ |
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for (i = 0; i < rdev->desc->n_voltages; i++) { |
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ret = rdev->desc->ops->list_voltage(rdev, i); |
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if (ret < 0) |
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continue; |
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if (ret < best_val && ret >= min_uV && ret <= max_uV) { |
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best_val = ret; |
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selector = i; |
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} |
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} |
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if (best_val != INT_MAX) |
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return selector; |
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else |
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return -EINVAL; |
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} |
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EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate); |
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/**
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* regulator_map_voltage_ascend - map_voltage() for ascendant voltage list |
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* |
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* @rdev: Regulator to operate on |
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* @min_uV: Lower bound for voltage |
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* @max_uV: Upper bound for voltage |
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* |
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* Drivers that have ascendant voltage list can use this as their |
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* map_voltage() operation. |
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*/ |
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int regulator_map_voltage_ascend(struct regulator_dev *rdev, |
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int min_uV, int max_uV) |
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{ |
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int i, ret; |
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for (i = 0; i < rdev->desc->n_voltages; i++) { |
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ret = rdev->desc->ops->list_voltage(rdev, i); |
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if (ret < 0) |
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continue; |
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if (ret > max_uV) |
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break; |
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if (ret >= min_uV && ret <= max_uV) |
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return i; |
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} |
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return -EINVAL; |
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} |
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EXPORT_SYMBOL_GPL(regulator_map_voltage_ascend); |
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/**
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* regulator_map_voltage_linear - map_voltage() for simple linear mappings |
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* |
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* @rdev: Regulator to operate on |
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* @min_uV: Lower bound for voltage |
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* @max_uV: Upper bound for voltage |
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* |
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* Drivers providing min_uV and uV_step in their regulator_desc can |
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* use this as their map_voltage() operation. |
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*/ |
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int regulator_map_voltage_linear(struct regulator_dev *rdev, |
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int min_uV, int max_uV) |
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{ |
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int ret, voltage; |
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/* Allow uV_step to be 0 for fixed voltage */ |
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if (rdev->desc->n_voltages == 1 && rdev->desc->uV_step == 0) { |
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if (min_uV <= rdev->desc->min_uV && rdev->desc->min_uV <= max_uV) |
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return 0; |
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else |
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return -EINVAL; |
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} |
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if (!rdev->desc->uV_step) { |
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BUG_ON(!rdev->desc->uV_step); |
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return -EINVAL; |
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} |
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if (min_uV < rdev->desc->min_uV) |
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min_uV = rdev->desc->min_uV; |
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ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step); |
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if (ret < 0) |
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return ret; |
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ret += rdev->desc->linear_min_sel; |
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/* Map back into a voltage to verify we're still in bounds */ |
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voltage = rdev->desc->ops->list_voltage(rdev, ret); |
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if (voltage < min_uV || voltage > max_uV) |
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return -EINVAL; |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(regulator_map_voltage_linear); |
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/**
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* regulator_map_voltage_linear - map_voltage() for multiple linear ranges |
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* |
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* @rdev: Regulator to operate on |
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* @min_uV: Lower bound for voltage |
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* @max_uV: Upper bound for voltage |
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* |
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* Drivers providing linear_ranges in their descriptor can use this as |
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* their map_voltage() callback. |
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*/ |
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int regulator_map_voltage_linear_range(struct regulator_dev *rdev, |
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int min_uV, int max_uV) |
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{ |
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const struct regulator_linear_range *range; |
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int ret = -EINVAL; |
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int voltage, i; |
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if (!rdev->desc->n_linear_ranges) { |
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BUG_ON(!rdev->desc->n_linear_ranges); |
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return -EINVAL; |
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} |
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for (i = 0; i < rdev->desc->n_linear_ranges; i++) { |
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range = &rdev->desc->linear_ranges[i]; |
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if (!(min_uV <= range->max_uV && max_uV >= range->min_uV)) |
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continue; |
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if (min_uV <= range->min_uV) |
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min_uV = range->min_uV; |
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/* range->uV_step == 0 means fixed voltage range */ |
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if (range->uV_step == 0) { |
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ret = 0; |
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} else { |
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ret = DIV_ROUND_UP(min_uV - range->min_uV, |
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range->uV_step); |
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if (ret < 0) |
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return ret; |
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} |
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ret += range->min_sel; |
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break; |
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} |
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if (i == rdev->desc->n_linear_ranges) |
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return -EINVAL; |
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/* Map back into a voltage to verify we're still in bounds */ |
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voltage = rdev->desc->ops->list_voltage(rdev, ret); |
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if (voltage < min_uV || voltage > max_uV) |
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return -EINVAL; |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(regulator_map_voltage_linear_range); |
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/**
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* regulator_set_bypass_regmap - Default set_bypass() using regmap |
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* |
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* @rdev: device to operate on. |
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* @enable: state to set. |
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*/ |
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int regulator_set_bypass_regmap(struct regulator_dev *rdev, bool enable) |
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{ |
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unsigned int val; |
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if (enable) |
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val = rdev->desc->bypass_mask; |
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else |
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val = 0; |
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return regmap_update_bits(rdev->regmap, rdev->desc->bypass_reg, |
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rdev->desc->bypass_mask, val); |
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} |
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EXPORT_SYMBOL_GPL(regulator_set_bypass_regmap); |
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/**
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* regulator_get_bypass_regmap - Default get_bypass() using regmap |
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* |
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* @rdev: device to operate on. |
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* @enable: current state. |
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*/ |
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int regulator_get_bypass_regmap(struct regulator_dev *rdev, bool *enable) |
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{ |
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unsigned int val; |
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int ret; |
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ret = regmap_read(rdev->regmap, rdev->desc->bypass_reg, &val); |
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if (ret != 0) |
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return ret; |
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*enable = val & rdev->desc->bypass_mask; |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(regulator_get_bypass_regmap); |
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