418 lines
10 KiB
C
418 lines
10 KiB
C
/*
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* Regulators driver for allwinnertech AXP20
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*
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* Copyright (C) 2014 allwinnertech Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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/init.h>
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#include <linux/regmap.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/module.h>
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#include <linux/power/axp_depend.h>
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#include "../axp-core.h"
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#include "../axp-regulator.h"
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#include "axp20.h"
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#include "axp20-regu.h"
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/* Reverse engineered partly from Platformx drivers */
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enum AXP_REGLS {
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VCC_DCDC2,
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VCC_DCDC3,
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VCC_LDO1,
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VCC_LDO2,
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VCC_LDO3,
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VCC_LDO4,
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VCC_LDOIO0,
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VCC_20_MAX,
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};
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struct axp20_regulators {
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struct regulator_dev *regulators[VCC_20_MAX];
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struct axp_dev *chip;
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};
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static const int axp20_ldo4_table[] = {
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1250, 1300, 1400, 1500,
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1600, 1700, 1800, 1900,
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2000, 2500, 2700, 2800,
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3000, 3100, 3200, 3300
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};
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#define AXP20_LDO(_id, min, max, step1, vreg, shift, nbits,\
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ereg, emask, enval, disval, switch_vol, step2, new_level,\
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mode_addr, freq_addr, dvm_ereg, dvm_ebit, dvm_flag) \
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AXP_LDO(AXP20, _id, min, max, step1, vreg, shift, nbits,\
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ereg, emask, enval, disval, switch_vol, step2, new_level,\
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mode_addr, freq_addr, dvm_ereg, dvm_ebit, dvm_flag)
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#define AXP20_LDO_SEL(_id, min, max, vreg, shift, nbits,\
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ereg, emask, enval, disval, vtable,\
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mode_addr, freq_addr, dvm_ereg, dvm_ebit, dvm_flag) \
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AXP_LDO_SEL(AXP20, _id, min, max, vreg, shift, nbits,\
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ereg, emask, enval, disval, vtable,\
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mode_addr, freq_addr, dvm_ereg, dvm_ebit, dvm_flag)
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#define AXP20_DCDC(_id, min, max, step1, vreg, shift, nbits,\
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ereg, emask, enval, disval, switch_vol, step2, new_level,\
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mode_addr, mode_bit, freq_addr, dvm_ereg, dvm_ebit, dvm_flag) \
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AXP_DCDC(AXP20, _id, min, max, step1, vreg, shift, nbits,\
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ereg, emask, enval, disval, switch_vol, step2, new_level,\
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mode_addr, mode_bit, freq_addr, dvm_ereg, dvm_ebit, dvm_flag)
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static struct axp_regulator_info axp20_regulator_info[] = {
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AXP20_DCDC(2, 700, 2275, 25, DCDC2, 0, 6, DCDC2EN, 0x10,
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0x10, 0, 0, 0, 0, 0x80, 0x04, 0x37, 0x25, 2, 0),
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AXP20_DCDC(3, 700, 3500, 25, DCDC3, 0, 7, DCDC3EN, 0x02,
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0x02, 0, 0, 0, 0, 0x80, 0x02, 0x37, 0, 0, 0),
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AXP20_LDO(1, 1300, 1300, 0, RTC, 0, 0, RTCLDOEN, 0x01,
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0x01, 0, 0, 0, 0, 0, 0, 0, 0, 0),
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AXP20_LDO(2, 1800, 3300, 100, LDO2, 4, 4, LDO2EN, 0x04,
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0x04, 0, 0, 0, 0, 0, 0, 0, 0, 0),
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AXP20_LDO(3, 700, 3500, 25, LDO3, 0, 7, LDO3EN, 0x40,
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0x40, 0, 0, 0, 0, 0, 0, 0, 0, 0),
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AXP20_LDO_SEL(4, 1250, 3300, LDO4, 0, 4, LDO4EN, 0x08,
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0x08, 0, axp20_ldo4, 0, 0, 0, 0, 0),
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AXP20_LDO(IO0, 1800, 3300, 100, LDOIO0, 4, 4, LDOIO0EN, 0x07,
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0x03, 0, 0, 0, 0, 0, 0, 0, 0, 0),
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};
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static struct regulator_init_data axp_regl_init_data[] = {
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[VCC_DCDC2] = {
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.constraints = {
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.name = "axp20_dcdc2",
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.min_uV = 700000,
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.max_uV = 2275000,
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.valid_ops_mask = REGULATOR_CHANGE_VOLTAGE
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| REGULATOR_CHANGE_STATUS,
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},
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},
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[VCC_DCDC3] = {
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.constraints = {
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.name = "axp20_dcdc3",
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.min_uV = 700000,
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.max_uV = 3500000,
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.valid_ops_mask = REGULATOR_CHANGE_VOLTAGE
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| REGULATOR_CHANGE_STATUS,
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},
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},
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[VCC_LDO1] = {
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.constraints = {
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.name = "axp20_rtc",
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.min_uV = 1300000,
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.max_uV = 1300000,
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},
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},
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[VCC_LDO2] = {
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.constraints = {
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.name = "axp20_ldo2",
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.min_uV = 1800000,
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.max_uV = 3300000,
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.valid_ops_mask = REGULATOR_CHANGE_VOLTAGE
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| REGULATOR_CHANGE_STATUS,
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},
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},
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[VCC_LDO3] = {
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.constraints = {
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.name = "axp20_ldo3",
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.min_uV = 700000,
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.max_uV = 3500000,
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.valid_ops_mask = REGULATOR_CHANGE_VOLTAGE
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| REGULATOR_CHANGE_STATUS,
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},
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},
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[VCC_LDO4] = {
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.constraints = {
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.name = "axp20_ldo4",
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.min_uV = 1250000,
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.max_uV = 3300000,
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.valid_ops_mask = REGULATOR_CHANGE_VOLTAGE
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| REGULATOR_CHANGE_STATUS,
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},
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},
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[VCC_LDOIO0] = {
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.constraints = {
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.name = "axp20_ldoio0",
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.min_uV = 1800000,
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.max_uV = 3300000,
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.valid_ops_mask = REGULATOR_CHANGE_VOLTAGE
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| REGULATOR_CHANGE_STATUS,
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},
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},
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};
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static ssize_t workmode_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int ret;
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uint8_t val;
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struct regulator_dev *rdev;
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struct axp_regulator_info *info;
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struct axp_regmap *regmap;
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rdev = container_of(dev, struct regulator_dev, dev);
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info = rdev_get_drvdata(rdev);
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regmap = info->regmap;
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ret = axp_regmap_read(regmap, info->mode_reg, &val);
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if (ret)
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return sprintf(buf, "IO ERROR\n");
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if ((val & info->mode_mask) == info->mode_mask)
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return sprintf(buf, "PWM\n");
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else
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return sprintf(buf, "AUTO\n");
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}
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static ssize_t workmode_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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uint8_t val;
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struct regulator_dev *rdev;
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struct axp_regulator_info *info;
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struct axp_regmap *regmap;
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unsigned int mode;
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int ret;
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rdev = container_of(dev, struct regulator_dev, dev);
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info = rdev_get_drvdata(rdev);
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regmap = info->regmap;
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ret = sscanf(buf, "%u", &mode);
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if (ret != 1)
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return -EINVAL;
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val = !!mode;
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if (val)
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axp_regmap_set_bits(regmap, info->mode_reg, info->mode_mask);
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else
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axp_regmap_clr_bits(regmap, info->mode_reg, info->mode_mask);
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return count;
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}
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static ssize_t frequency_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int ret;
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uint8_t val;
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struct regulator_dev *rdev;
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struct axp_regulator_info *info;
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struct axp_regmap *regmap;
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rdev = container_of(dev, struct regulator_dev, dev);
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info = rdev_get_drvdata(rdev);
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regmap = info->regmap;
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ret = axp_regmap_read(regmap, info->freq_reg, &val);
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if (ret)
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return ret;
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ret = val & 0x0F;
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return sprintf(buf, "%d\n", (ret * 75 + 750));
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}
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static ssize_t frequency_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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uint8_t val, tmp;
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int var, err;
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struct regulator_dev *rdev;
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struct axp_regulator_info *info;
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struct axp_regmap *regmap;
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rdev = container_of(dev, struct regulator_dev, dev);
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info = rdev_get_drvdata(rdev);
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regmap = info->regmap;
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err = kstrtoint(buf, 10, &var);
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if (err)
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return err;
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if (var < 750)
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var = 750;
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if (var > 1875)
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var = 1875;
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val = (var - 750) / 75;
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val &= 0x0F;
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axp_regmap_read(regmap, info->freq_reg, &tmp);
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tmp &= 0xF0;
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val |= tmp;
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axp_regmap_write(regmap, info->freq_reg, val);
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return count;
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}
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static struct device_attribute axp_regu_attrs[] = {
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AXP_REGU_ATTR(workmode),
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AXP_REGU_ATTR(frequency),
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};
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static int axp_regu_create_attrs(struct device *dev)
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{
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int j, ret;
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for (j = 0; j < ARRAY_SIZE(axp_regu_attrs); j++) {
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ret = device_create_file(dev, &axp_regu_attrs[j]);
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if (ret)
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goto sysfs_failed;
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}
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return 0;
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sysfs_failed:
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while (j--)
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device_remove_file(dev, &axp_regu_attrs[j]);
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return ret;
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}
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static s32 axp20_regu_dependence(const char *ldo_name)
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{
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s32 axp20_dependence = 0;
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if (strstr(ldo_name, "dcdc2") != NULL)
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axp20_dependence |= AXP20X_DCDC2;
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else if (strstr(ldo_name, "dcdc3") != NULL)
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axp20_dependence |= AXP20X_DCDC3;
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else if (strstr(ldo_name, "ldo2") != NULL)
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axp20_dependence |= AXP20X_LDO2;
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else if (strstr(ldo_name, "ldo3") != NULL)
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axp20_dependence |= AXP20X_LDO3;
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else if (strstr(ldo_name, "ldo4") != NULL)
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axp20_dependence |= AXP20X_LDO4;
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else if (strstr(ldo_name, "ldoio0") != NULL)
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axp20_dependence |= AXP20X_LDOIO0;
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else if (strstr(ldo_name, "rtc") != NULL)
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axp20_dependence |= AXP20X_RTC;
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else
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return -1;
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return axp20_dependence;
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}
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static int axp20_regulator_probe(struct platform_device *pdev)
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{
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s32 i, ret = 0;
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struct axp_regulator_info *info;
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struct axp20_regulators *regu_data;
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struct axp_dev *axp_dev = dev_get_drvdata(pdev->dev.parent);
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if (pdev->dev.of_node) {
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ret = axp_regulator_dt_parse(pdev->dev.of_node,
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axp_regl_init_data,
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axp20_regu_dependence);
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if (ret) {
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pr_err("%s parse device tree err\n", __func__);
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return -EINVAL;
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}
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} else {
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pr_err("axp20 regulator device tree err!\n");
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return -EBUSY;
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}
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regu_data = devm_kzalloc(&pdev->dev, sizeof(*regu_data),
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GFP_KERNEL);
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if (!regu_data)
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return -ENOMEM;
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regu_data->chip = axp_dev;
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platform_set_drvdata(pdev, regu_data);
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for (i = 0; i < VCC_20_MAX; i++) {
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info = &axp20_regulator_info[i];
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info->pmu_num = axp_dev->pmu_num;
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if (info->desc.id == AXP20_ID_DCDC2
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|| info->desc.id == AXP20_ID_DCDC3
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|| info->desc.id == AXP20_ID_LDO1
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|| info->desc.id == AXP20_ID_LDO2
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|| info->desc.id == AXP20_ID_LDO3
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|| info->desc.id == AXP20_ID_LDOIO0) {
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regu_data->regulators[i] = axp_regulator_register(
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&pdev->dev, axp_dev->regmap,
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&axp_regl_init_data[i], info);
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} else if (info->desc.id == AXP20_ID_LDO4) {
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regu_data->regulators[i] = axp_regulator_sel_register
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(&pdev->dev, axp_dev->regmap,
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&axp_regl_init_data[i], info);
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}
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if (IS_ERR(regu_data->regulators[i])) {
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dev_err(&pdev->dev,
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"failed to register regulator %s\n",
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info->desc.name);
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while (--i >= 0)
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axp_regulator_unregister(
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regu_data->regulators[i]);
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return -1;
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}
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if (info->desc.id >= AXP_DCDC_ID_START) {
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ret = axp_regu_create_attrs(
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®u_data->regulators[i]->dev);
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if (ret)
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dev_err(&pdev->dev,
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"failed to register regulator attr %s\n",
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info->desc.name);
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}
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}
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return 0;
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}
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static int axp20_regulator_remove(struct platform_device *pdev)
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{
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struct axp20_regulators *regu_data = platform_get_drvdata(pdev);
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int i;
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for (i = 0; i < VCC_20_MAX; i++)
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regulator_unregister(regu_data->regulators[i]);
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return 0;
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}
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static const struct of_device_id axp20_regu_dt_ids[] = {
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{ .compatible = "axp20-regulator", },
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{},
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};
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MODULE_DEVICE_TABLE(of, axp20_regu_dt_ids);
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static struct platform_driver axp20_regulator_driver = {
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.driver = {
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.name = "axp20-regulator",
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.of_match_table = axp20_regu_dt_ids,
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},
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.probe = axp20_regulator_probe,
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.remove = axp20_regulator_remove,
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};
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static int __init axp20_regulator_initcall(void)
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{
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int ret;
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ret = platform_driver_register(&axp20_regulator_driver);
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if (IS_ERR_VALUE(ret)) {
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pr_err("%s: failed, errno %d\n", __func__, ret);
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return -EINVAL;
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}
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return 0;
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}
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subsys_initcall(axp20_regulator_initcall);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Ming Li");
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MODULE_DESCRIPTION("Regulator Driver for allwinnertech PMIC");
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MODULE_ALIAS("platform:axp-regulator");
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