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275 lines
7.6 KiB
275 lines
7.6 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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// |
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// Regulator support for WM8400 |
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// |
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// Copyright 2008 Wolfson Microelectronics PLC. |
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// |
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// Author: Mark Brown <[email protected]> |
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#include <linux/bug.h> |
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#include <linux/err.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/regulator/driver.h> |
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#include <linux/mfd/wm8400-private.h> |
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static const struct linear_range wm8400_ldo_ranges[] = { |
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REGULATOR_LINEAR_RANGE(900000, 0, 14, 50000), |
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REGULATOR_LINEAR_RANGE(1700000, 15, 31, 100000), |
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}; |
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static const struct regulator_ops wm8400_ldo_ops = { |
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.is_enabled = regulator_is_enabled_regmap, |
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.enable = regulator_enable_regmap, |
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.disable = regulator_disable_regmap, |
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.list_voltage = regulator_list_voltage_linear_range, |
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.get_voltage_sel = regulator_get_voltage_sel_regmap, |
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.set_voltage_sel = regulator_set_voltage_sel_regmap, |
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.map_voltage = regulator_map_voltage_linear_range, |
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}; |
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static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev) |
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{ |
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struct regmap *rmap = rdev_get_regmap(dev); |
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int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; |
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u16 data[2]; |
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int ret; |
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ret = regmap_bulk_read(rmap, WM8400_DCDC1_CONTROL_1 + offset, data, 2); |
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if (ret != 0) |
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return 0; |
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/* Datasheet: hibernate */ |
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if (data[0] & WM8400_DC1_SLEEP) |
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return REGULATOR_MODE_STANDBY; |
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/* Datasheet: standby */ |
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if (!(data[0] & WM8400_DC1_ACTIVE)) |
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return REGULATOR_MODE_IDLE; |
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/* Datasheet: active with or without force PWM */ |
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if (data[1] & WM8400_DC1_FRC_PWM) |
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return REGULATOR_MODE_FAST; |
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else |
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return REGULATOR_MODE_NORMAL; |
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} |
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static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode) |
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{ |
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struct regmap *rmap = rdev_get_regmap(dev); |
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int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; |
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int ret; |
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switch (mode) { |
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case REGULATOR_MODE_FAST: |
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/* Datasheet: active with force PWM */ |
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ret = regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_2 + offset, |
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WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM); |
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if (ret != 0) |
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return ret; |
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return regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_1 + offset, |
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WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, |
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WM8400_DC1_ACTIVE); |
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case REGULATOR_MODE_NORMAL: |
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/* Datasheet: active */ |
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ret = regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_2 + offset, |
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WM8400_DC1_FRC_PWM, 0); |
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if (ret != 0) |
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return ret; |
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return regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_1 + offset, |
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WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, |
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WM8400_DC1_ACTIVE); |
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case REGULATOR_MODE_IDLE: |
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/* Datasheet: standby */ |
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return regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_1 + offset, |
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WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, 0); |
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default: |
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return -EINVAL; |
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} |
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} |
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static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev, |
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int input_uV, int output_uV, |
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int load_uA) |
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{ |
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return REGULATOR_MODE_NORMAL; |
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} |
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static const struct regulator_ops wm8400_dcdc_ops = { |
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.is_enabled = regulator_is_enabled_regmap, |
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.enable = regulator_enable_regmap, |
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.disable = regulator_disable_regmap, |
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.list_voltage = regulator_list_voltage_linear, |
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.map_voltage = regulator_map_voltage_linear, |
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.get_voltage_sel = regulator_get_voltage_sel_regmap, |
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.set_voltage_sel = regulator_set_voltage_sel_regmap, |
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.get_mode = wm8400_dcdc_get_mode, |
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.set_mode = wm8400_dcdc_set_mode, |
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.get_optimum_mode = wm8400_dcdc_get_optimum_mode, |
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}; |
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static struct regulator_desc regulators[] = { |
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{ |
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.name = "LDO1", |
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.id = WM8400_LDO1, |
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.ops = &wm8400_ldo_ops, |
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.enable_reg = WM8400_LDO1_CONTROL, |
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.enable_mask = WM8400_LDO1_ENA, |
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.n_voltages = WM8400_LDO1_VSEL_MASK + 1, |
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.linear_ranges = wm8400_ldo_ranges, |
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.n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges), |
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.vsel_reg = WM8400_LDO1_CONTROL, |
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.vsel_mask = WM8400_LDO1_VSEL_MASK, |
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.type = REGULATOR_VOLTAGE, |
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.owner = THIS_MODULE, |
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}, |
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{ |
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.name = "LDO2", |
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.id = WM8400_LDO2, |
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.ops = &wm8400_ldo_ops, |
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.enable_reg = WM8400_LDO2_CONTROL, |
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.enable_mask = WM8400_LDO2_ENA, |
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.n_voltages = WM8400_LDO2_VSEL_MASK + 1, |
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.linear_ranges = wm8400_ldo_ranges, |
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.n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges), |
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.type = REGULATOR_VOLTAGE, |
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.vsel_reg = WM8400_LDO2_CONTROL, |
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.vsel_mask = WM8400_LDO2_VSEL_MASK, |
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.owner = THIS_MODULE, |
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}, |
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{ |
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.name = "LDO3", |
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.id = WM8400_LDO3, |
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.ops = &wm8400_ldo_ops, |
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.enable_reg = WM8400_LDO3_CONTROL, |
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.enable_mask = WM8400_LDO3_ENA, |
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.n_voltages = WM8400_LDO3_VSEL_MASK + 1, |
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.linear_ranges = wm8400_ldo_ranges, |
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.n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges), |
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.vsel_reg = WM8400_LDO3_CONTROL, |
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.vsel_mask = WM8400_LDO3_VSEL_MASK, |
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.type = REGULATOR_VOLTAGE, |
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.owner = THIS_MODULE, |
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}, |
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{ |
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.name = "LDO4", |
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.id = WM8400_LDO4, |
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.ops = &wm8400_ldo_ops, |
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.enable_reg = WM8400_LDO4_CONTROL, |
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.enable_mask = WM8400_LDO4_ENA, |
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.n_voltages = WM8400_LDO4_VSEL_MASK + 1, |
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.linear_ranges = wm8400_ldo_ranges, |
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.n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges), |
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.vsel_reg = WM8400_LDO4_CONTROL, |
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.vsel_mask = WM8400_LDO4_VSEL_MASK, |
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.type = REGULATOR_VOLTAGE, |
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.owner = THIS_MODULE, |
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}, |
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{ |
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.name = "DCDC1", |
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.id = WM8400_DCDC1, |
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.ops = &wm8400_dcdc_ops, |
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.enable_reg = WM8400_DCDC1_CONTROL_1, |
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.enable_mask = WM8400_DC1_ENA_MASK, |
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.n_voltages = WM8400_DC1_VSEL_MASK + 1, |
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.vsel_reg = WM8400_DCDC1_CONTROL_1, |
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.vsel_mask = WM8400_DC1_VSEL_MASK, |
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.min_uV = 850000, |
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.uV_step = 25000, |
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.type = REGULATOR_VOLTAGE, |
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.owner = THIS_MODULE, |
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}, |
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{ |
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.name = "DCDC2", |
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.id = WM8400_DCDC2, |
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.ops = &wm8400_dcdc_ops, |
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.enable_reg = WM8400_DCDC2_CONTROL_1, |
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.enable_mask = WM8400_DC2_ENA_MASK, |
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.n_voltages = WM8400_DC2_VSEL_MASK + 1, |
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.vsel_reg = WM8400_DCDC2_CONTROL_1, |
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.vsel_mask = WM8400_DC2_VSEL_MASK, |
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.min_uV = 850000, |
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.uV_step = 25000, |
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.type = REGULATOR_VOLTAGE, |
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.owner = THIS_MODULE, |
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}, |
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}; |
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static int wm8400_regulator_probe(struct platform_device *pdev) |
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{ |
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struct wm8400 *wm8400 = container_of(pdev, struct wm8400, regulators[pdev->id]); |
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struct regulator_config config = { }; |
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struct regulator_dev *rdev; |
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config.dev = &pdev->dev; |
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config.init_data = dev_get_platdata(&pdev->dev); |
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config.driver_data = wm8400; |
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config.regmap = wm8400->regmap; |
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rdev = devm_regulator_register(&pdev->dev, ®ulators[pdev->id], |
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&config); |
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if (IS_ERR(rdev)) |
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return PTR_ERR(rdev); |
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platform_set_drvdata(pdev, rdev); |
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return 0; |
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} |
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static struct platform_driver wm8400_regulator_driver = { |
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.driver = { |
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.name = "wm8400-regulator", |
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}, |
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.probe = wm8400_regulator_probe, |
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}; |
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/** |
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* wm8400_register_regulator - enable software control of a WM8400 regulator |
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* |
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* This function enables software control of a WM8400 regulator via |
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* the regulator API. It is intended to be called from the |
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* platform_init() callback of the WM8400 MFD driver. |
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* |
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* @dev: The WM8400 device to operate on. |
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* @reg: The regulator to control. |
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* @initdata: Regulator initdata for the regulator. |
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*/ |
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int wm8400_register_regulator(struct device *dev, int reg, |
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struct regulator_init_data *initdata) |
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{ |
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struct wm8400 *wm8400 = dev_get_drvdata(dev); |
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if (wm8400->regulators[reg].name) |
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return -EBUSY; |
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initdata->driver_data = wm8400; |
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wm8400->regulators[reg].name = "wm8400-regulator"; |
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wm8400->regulators[reg].id = reg; |
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wm8400->regulators[reg].dev.parent = dev; |
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wm8400->regulators[reg].dev.platform_data = initdata; |
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return platform_device_register(&wm8400->regulators[reg]); |
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} |
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EXPORT_SYMBOL_GPL(wm8400_register_regulator); |
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static int __init wm8400_regulator_init(void) |
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{ |
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return platform_driver_register(&wm8400_regulator_driver); |
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} |
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subsys_initcall(wm8400_regulator_init); |
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static void __exit wm8400_regulator_exit(void) |
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{ |
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platform_driver_unregister(&wm8400_regulator_driver); |
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} |
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module_exit(wm8400_regulator_exit); |
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MODULE_AUTHOR("Mark Brown <[email protected]>"); |
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MODULE_DESCRIPTION("WM8400 regulator driver"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:wm8400-regulator");
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