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285 lines
7.9 KiB
285 lines
7.9 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Regulators driver for Maxim max8925 |
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* |
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* Copyright (C) 2009 Marvell International Ltd. |
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* Haojian Zhuang <[email protected]> |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/err.h> |
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#include <linux/i2c.h> |
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#include <linux/platform_device.h> |
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#include <linux/regulator/driver.h> |
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#include <linux/regulator/machine.h> |
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#include <linux/mfd/max8925.h> |
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#include <linux/of.h> |
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#include <linux/regulator/of_regulator.h> |
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#define SD1_DVM_VMIN 850000 |
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#define SD1_DVM_VMAX 1000000 |
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#define SD1_DVM_STEP 50000 |
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#define SD1_DVM_SHIFT 5 /* SDCTL1 bit5 */ |
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#define SD1_DVM_EN 6 /* SDV1 bit 6 */ |
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/* bit definitions in LDO control registers */ |
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#define LDO_SEQ_I2C 0x7 /* Power U/D by i2c */ |
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#define LDO_SEQ_MASK 0x7 /* Power U/D sequence mask */ |
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#define LDO_SEQ_SHIFT 2 /* Power U/D sequence offset */ |
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#define LDO_I2C_EN 0x1 /* Enable by i2c */ |
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#define LDO_I2C_EN_MASK 0x1 /* Enable mask by i2c */ |
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#define LDO_I2C_EN_SHIFT 0 /* Enable offset by i2c */ |
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struct max8925_regulator_info { |
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struct regulator_desc desc; |
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struct i2c_client *i2c; |
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int vol_reg; |
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int enable_reg; |
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}; |
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static int max8925_set_voltage_sel(struct regulator_dev *rdev, |
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unsigned int selector) |
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{ |
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struct max8925_regulator_info *info = rdev_get_drvdata(rdev); |
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unsigned char mask = rdev->desc->n_voltages - 1; |
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return max8925_set_bits(info->i2c, info->vol_reg, mask, selector); |
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} |
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static int max8925_get_voltage_sel(struct regulator_dev *rdev) |
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{ |
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struct max8925_regulator_info *info = rdev_get_drvdata(rdev); |
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unsigned char data, mask; |
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int ret; |
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ret = max8925_reg_read(info->i2c, info->vol_reg); |
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if (ret < 0) |
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return ret; |
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mask = rdev->desc->n_voltages - 1; |
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data = ret & mask; |
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return data; |
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} |
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static int max8925_enable(struct regulator_dev *rdev) |
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{ |
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struct max8925_regulator_info *info = rdev_get_drvdata(rdev); |
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return max8925_set_bits(info->i2c, info->enable_reg, |
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LDO_SEQ_MASK << LDO_SEQ_SHIFT | |
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LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT, |
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LDO_SEQ_I2C << LDO_SEQ_SHIFT | |
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LDO_I2C_EN << LDO_I2C_EN_SHIFT); |
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} |
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static int max8925_disable(struct regulator_dev *rdev) |
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{ |
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struct max8925_regulator_info *info = rdev_get_drvdata(rdev); |
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return max8925_set_bits(info->i2c, info->enable_reg, |
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LDO_SEQ_MASK << LDO_SEQ_SHIFT | |
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LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT, |
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LDO_SEQ_I2C << LDO_SEQ_SHIFT); |
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} |
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static int max8925_is_enabled(struct regulator_dev *rdev) |
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{ |
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struct max8925_regulator_info *info = rdev_get_drvdata(rdev); |
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int ldo_seq, ret; |
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ret = max8925_reg_read(info->i2c, info->enable_reg); |
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if (ret < 0) |
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return ret; |
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ldo_seq = (ret >> LDO_SEQ_SHIFT) & LDO_SEQ_MASK; |
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if (ldo_seq != LDO_SEQ_I2C) |
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return 1; |
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else |
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return ret & (LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT); |
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} |
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static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV) |
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{ |
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struct max8925_regulator_info *info = rdev_get_drvdata(rdev); |
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unsigned char data, mask; |
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if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX) |
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return -EINVAL; |
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data = DIV_ROUND_UP(uV - SD1_DVM_VMIN, SD1_DVM_STEP); |
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data <<= SD1_DVM_SHIFT; |
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mask = 3 << SD1_DVM_SHIFT; |
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return max8925_set_bits(info->i2c, info->enable_reg, mask, data); |
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} |
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static int max8925_set_dvm_enable(struct regulator_dev *rdev) |
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{ |
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struct max8925_regulator_info *info = rdev_get_drvdata(rdev); |
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return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, |
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1 << SD1_DVM_EN); |
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} |
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static int max8925_set_dvm_disable(struct regulator_dev *rdev) |
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{ |
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struct max8925_regulator_info *info = rdev_get_drvdata(rdev); |
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return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0); |
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} |
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static const struct regulator_ops max8925_regulator_sdv_ops = { |
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.map_voltage = regulator_map_voltage_linear, |
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.list_voltage = regulator_list_voltage_linear, |
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.set_voltage_sel = max8925_set_voltage_sel, |
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.get_voltage_sel = max8925_get_voltage_sel, |
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.enable = max8925_enable, |
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.disable = max8925_disable, |
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.is_enabled = max8925_is_enabled, |
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.set_suspend_voltage = max8925_set_dvm_voltage, |
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.set_suspend_enable = max8925_set_dvm_enable, |
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.set_suspend_disable = max8925_set_dvm_disable, |
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}; |
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static const struct regulator_ops max8925_regulator_ldo_ops = { |
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.map_voltage = regulator_map_voltage_linear, |
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.list_voltage = regulator_list_voltage_linear, |
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.set_voltage_sel = max8925_set_voltage_sel, |
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.get_voltage_sel = max8925_get_voltage_sel, |
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.enable = max8925_enable, |
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.disable = max8925_disable, |
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.is_enabled = max8925_is_enabled, |
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}; |
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#define MAX8925_SDV(_id, min, max, step) \ |
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{ \ |
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.desc = { \ |
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.name = "SDV" #_id, \ |
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.of_match = of_match_ptr("SDV" #_id), \ |
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.regulators_node = of_match_ptr("regulators"), \ |
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.ops = &max8925_regulator_sdv_ops, \ |
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.type = REGULATOR_VOLTAGE, \ |
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.id = MAX8925_ID_SD##_id, \ |
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.owner = THIS_MODULE, \ |
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.n_voltages = 64, \ |
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.min_uV = min * 1000, \ |
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.uV_step = step * 1000, \ |
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}, \ |
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.vol_reg = MAX8925_SDV##_id, \ |
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.enable_reg = MAX8925_SDCTL##_id, \ |
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} |
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#define MAX8925_LDO(_id, min, max, step) \ |
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{ \ |
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.desc = { \ |
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.name = "LDO" #_id, \ |
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.of_match = of_match_ptr("LDO" #_id), \ |
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.regulators_node = of_match_ptr("regulators"), \ |
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.ops = &max8925_regulator_ldo_ops, \ |
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.type = REGULATOR_VOLTAGE, \ |
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.id = MAX8925_ID_LDO##_id, \ |
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.owner = THIS_MODULE, \ |
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.n_voltages = 64, \ |
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.min_uV = min * 1000, \ |
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.uV_step = step * 1000, \ |
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}, \ |
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.vol_reg = MAX8925_LDOVOUT##_id, \ |
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.enable_reg = MAX8925_LDOCTL##_id, \ |
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} |
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static struct max8925_regulator_info max8925_regulator_info[] = { |
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MAX8925_SDV(1, 637.5, 1425, 12.5), |
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MAX8925_SDV(2, 650, 2225, 25), |
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MAX8925_SDV(3, 750, 3900, 50), |
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MAX8925_LDO(1, 750, 3900, 50), |
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MAX8925_LDO(2, 650, 2250, 25), |
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MAX8925_LDO(3, 650, 2250, 25), |
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MAX8925_LDO(4, 750, 3900, 50), |
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MAX8925_LDO(5, 750, 3900, 50), |
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MAX8925_LDO(6, 750, 3900, 50), |
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MAX8925_LDO(7, 750, 3900, 50), |
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MAX8925_LDO(8, 750, 3900, 50), |
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MAX8925_LDO(9, 750, 3900, 50), |
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MAX8925_LDO(10, 750, 3900, 50), |
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MAX8925_LDO(11, 750, 3900, 50), |
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MAX8925_LDO(12, 750, 3900, 50), |
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MAX8925_LDO(13, 750, 3900, 50), |
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MAX8925_LDO(14, 750, 3900, 50), |
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MAX8925_LDO(15, 750, 3900, 50), |
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MAX8925_LDO(16, 750, 3900, 50), |
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MAX8925_LDO(17, 650, 2250, 25), |
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MAX8925_LDO(18, 650, 2250, 25), |
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MAX8925_LDO(19, 750, 3900, 50), |
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MAX8925_LDO(20, 750, 3900, 50), |
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}; |
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static int max8925_regulator_probe(struct platform_device *pdev) |
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{ |
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struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); |
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struct regulator_init_data *pdata = dev_get_platdata(&pdev->dev); |
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struct regulator_config config = { }; |
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struct max8925_regulator_info *ri; |
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struct resource *res; |
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struct regulator_dev *rdev; |
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int i; |
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res = platform_get_resource(pdev, IORESOURCE_REG, 0); |
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if (!res) { |
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dev_err(&pdev->dev, "No REG resource!\n"); |
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return -EINVAL; |
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} |
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for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) { |
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ri = &max8925_regulator_info[i]; |
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if (ri->vol_reg == res->start) |
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break; |
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} |
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if (i == ARRAY_SIZE(max8925_regulator_info)) { |
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dev_err(&pdev->dev, "Failed to find regulator %llu\n", |
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(unsigned long long)res->start); |
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return -EINVAL; |
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} |
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ri->i2c = chip->i2c; |
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config.dev = chip->dev; |
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config.driver_data = ri; |
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if (pdata) |
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config.init_data = pdata; |
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rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config); |
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if (IS_ERR(rdev)) { |
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dev_err(&pdev->dev, "failed to register regulator %s\n", |
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ri->desc.name); |
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return PTR_ERR(rdev); |
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} |
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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 max8925_regulator_driver = { |
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.driver = { |
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.name = "max8925-regulator", |
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}, |
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.probe = max8925_regulator_probe, |
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}; |
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static int __init max8925_regulator_init(void) |
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{ |
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return platform_driver_register(&max8925_regulator_driver); |
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} |
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subsys_initcall(max8925_regulator_init); |
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static void __exit max8925_regulator_exit(void) |
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{ |
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platform_driver_unregister(&max8925_regulator_driver); |
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} |
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module_exit(max8925_regulator_exit); |
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MODULE_LICENSE("GPL"); |
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MODULE_AUTHOR("Haojian Zhuang <[email protected]>"); |
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MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC"); |
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MODULE_ALIAS("platform:max8925-regulator");
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