// SPDX-License-Identifier: GPL-2.0
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/*
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* Device driver for regulators in Hisi IC
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*
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* Copyright (c) 2013 Linaro Ltd.
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* Copyright (c) 2011 Hisilicon.
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*
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* Guodong Xu <guodong.xu@linaro.org>
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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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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/mfd/hi6421-spmi-pmic.h>
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#include <linux/module.h>
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#include <linux/of_address.h>
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#include <linux/of_device.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.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/regulator/of_regulator.h>
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#include <linux/seq_file.h>
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#include <linux/slab.h>
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#include <linux/spmi.h>
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#include <linux/time.h>
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#include <linux/uaccess.h>
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#define rdev_dbg(rdev, fmt, arg...) \
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pr_debug("%s: %s: " fmt, (rdev)->desc->name, __func__, ##arg)
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struct hi6421v600_regulator {
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struct regulator_desc rdesc;
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struct hi6421_spmi_pmic *pmic;
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u32 eco_mode_mask, eco_uA;
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};
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static DEFINE_MUTEX(enable_mutex);
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/*
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* helper function to ensure when it returns it is at least 'delay_us'
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* microseconds after 'since'.
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*/
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static int hi6421_spmi_regulator_is_enabled(struct regulator_dev *rdev)
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{
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struct hi6421v600_regulator *sreg = rdev_get_drvdata(rdev);
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struct hi6421_spmi_pmic *pmic = sreg->pmic;
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u32 reg_val;
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reg_val = hi6421_spmi_pmic_read(pmic, rdev->desc->enable_reg);
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rdev_dbg(rdev,
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"enable_reg=0x%x, val= 0x%x, enable_state=%d\n",
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rdev->desc->enable_reg,
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reg_val, (reg_val & rdev->desc->enable_mask));
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return ((reg_val & rdev->desc->enable_mask) != 0);
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}
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static int hi6421_spmi_regulator_enable(struct regulator_dev *rdev)
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{
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struct hi6421v600_regulator *sreg = rdev_get_drvdata(rdev);
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struct hi6421_spmi_pmic *pmic = sreg->pmic;
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/* cannot enable more than one regulator at one time */
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mutex_lock(&enable_mutex);
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usleep_range(HISI_REGS_ENA_PROTECT_TIME,
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HISI_REGS_ENA_PROTECT_TIME + 1000);
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/* set enable register */
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rdev_dbg(rdev,
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"off_on_delay=%d us, enable_reg=0x%x, enable_mask=0x%x\n",
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rdev->desc->off_on_delay, rdev->desc->enable_reg,
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rdev->desc->enable_mask);
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hi6421_spmi_pmic_rmw(pmic, rdev->desc->enable_reg,
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rdev->desc->enable_mask,
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rdev->desc->enable_mask);
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mutex_unlock(&enable_mutex);
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return 0;
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}
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static int hi6421_spmi_regulator_disable(struct regulator_dev *rdev)
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{
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struct hi6421v600_regulator *sreg = rdev_get_drvdata(rdev);
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struct hi6421_spmi_pmic *pmic = sreg->pmic;
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/* set enable register to 0 */
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rdev_dbg(rdev, "enable_reg=0x%x, enable_mask=0x%x\n",
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rdev->desc->enable_reg, rdev->desc->enable_mask);
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hi6421_spmi_pmic_rmw(pmic, rdev->desc->enable_reg,
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rdev->desc->enable_mask, 0);
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return 0;
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}
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static int hi6421_spmi_regulator_get_voltage_sel(struct regulator_dev *rdev)
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{
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struct hi6421v600_regulator *sreg = rdev_get_drvdata(rdev);
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struct hi6421_spmi_pmic *pmic = sreg->pmic;
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u32 reg_val, selector;
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/* get voltage selector */
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reg_val = hi6421_spmi_pmic_read(pmic, rdev->desc->vsel_reg);
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selector = (reg_val & rdev->desc->vsel_mask) >> (ffs(rdev->desc->vsel_mask) - 1);
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rdev_dbg(rdev,
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"vsel_reg=0x%x, value=0x%x, entry=0x%x, voltage=%d mV\n",
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rdev->desc->vsel_reg, reg_val, selector,
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rdev->desc->ops->list_voltage(rdev, selector) / 1000);
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return selector;
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}
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static int hi6421_spmi_regulator_set_voltage_sel(struct regulator_dev *rdev,
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unsigned int selector)
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{
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struct hi6421v600_regulator *sreg = rdev_get_drvdata(rdev);
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struct hi6421_spmi_pmic *pmic = sreg->pmic;
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u32 reg_val;
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if (unlikely(selector >= rdev->desc->n_voltages))
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return -EINVAL;
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reg_val = selector << (ffs(rdev->desc->vsel_mask) - 1);
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/* set voltage selector */
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rdev_dbg(rdev,
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"vsel_reg=0x%x, mask=0x%x, value=0x%x, voltage=%d mV\n",
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rdev->desc->vsel_reg, rdev->desc->vsel_mask, reg_val,
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rdev->desc->ops->list_voltage(rdev, selector) / 1000);
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hi6421_spmi_pmic_rmw(pmic, rdev->desc->vsel_reg,
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rdev->desc->vsel_mask, reg_val);
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return 0;
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}
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static unsigned int hi6421_spmi_regulator_get_mode(struct regulator_dev *rdev)
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{
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struct hi6421v600_regulator *sreg = rdev_get_drvdata(rdev);
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struct hi6421_spmi_pmic *pmic = sreg->pmic;
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unsigned int mode;
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u32 reg_val;
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reg_val = hi6421_spmi_pmic_read(pmic, rdev->desc->enable_reg);
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if (reg_val & sreg->eco_mode_mask)
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mode = REGULATOR_MODE_IDLE;
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else
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mode = REGULATOR_MODE_NORMAL;
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rdev_dbg(rdev,
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"enable_reg=0x%x, eco_mode_mask=0x%x, reg_val=0x%x, %s mode\n",
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rdev->desc->enable_reg, sreg->eco_mode_mask, reg_val,
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mode == REGULATOR_MODE_IDLE ? "idle" : "normal");
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return mode;
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}
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static int hi6421_spmi_regulator_set_mode(struct regulator_dev *rdev,
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unsigned int mode)
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{
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struct hi6421v600_regulator *sreg = rdev_get_drvdata(rdev);
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struct hi6421_spmi_pmic *pmic = sreg->pmic;
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u32 val;
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switch (mode) {
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case REGULATOR_MODE_NORMAL:
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val = 0;
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break;
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case REGULATOR_MODE_IDLE:
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val = sreg->eco_mode_mask << (ffs(sreg->eco_mode_mask) - 1);
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break;
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default:
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return -EINVAL;
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}
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/* set mode */
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rdev_dbg(rdev, "enable_reg=0x%x, eco_mode_mask=0x%x, value=0x%x\n",
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rdev->desc->enable_reg, sreg->eco_mode_mask, val);
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hi6421_spmi_pmic_rmw(pmic, rdev->desc->enable_reg,
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sreg->eco_mode_mask, val);
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return 0;
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}
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static unsigned int
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hi6421_spmi_regulator_get_optimum_mode(struct regulator_dev *rdev,
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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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struct hi6421v600_regulator *sreg = rdev_get_drvdata(rdev);
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if (load_uA || ((unsigned int)load_uA > sreg->eco_uA))
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return REGULATOR_MODE_NORMAL;
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return REGULATOR_MODE_IDLE;
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}
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static int hi6421_spmi_dt_parse(struct platform_device *pdev,
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struct hi6421v600_regulator *sreg,
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struct regulator_desc *rdesc)
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{
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struct device *dev = &pdev->dev;
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struct device_node *np = dev->of_node;
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unsigned int *v_table;
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int ret;
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ret = of_property_read_u32(np, "reg", &rdesc->enable_reg);
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if (ret) {
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dev_err(dev, "missing reg property\n");
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return ret;
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}
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ret = of_property_read_u32(np, "vsel-reg", &rdesc->vsel_reg);
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if (ret) {
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dev_err(dev, "missing vsel-reg property\n");
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return ret;
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}
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ret = of_property_read_u32(np, "enable-mask", &rdesc->enable_mask);
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if (ret) {
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dev_err(dev, "missing enable-mask property\n");
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return ret;
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}
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/*
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* Not all regulators work on idle mode
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*/
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ret = of_property_read_u32(np, "idle-mode-mask", &sreg->eco_mode_mask);
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if (ret) {
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dev_dbg(dev, "LDO doesn't support economy mode.\n");
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sreg->eco_mode_mask = 0;
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sreg->eco_uA = 0;
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} else {
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ret = of_property_read_u32(np, "eco-microamp", &sreg->eco_uA);
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if (ret) {
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dev_err(dev, "missing eco-microamp property\n");
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return ret;
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}
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}
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/* parse .off-on-delay */
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ret = of_property_read_u32(np, "off-on-delay-us",
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&rdesc->off_on_delay);
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if (ret) {
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dev_err(dev, "missing off-on-delay-us property\n");
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return ret;
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}
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/* parse .enable_time */
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ret = of_property_read_u32(np, "startup-delay-us",
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&rdesc->enable_time);
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if (ret) {
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dev_err(dev, "missing startup-delay-us property\n");
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return ret;
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}
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/* FIXME: are there a better value for this? */
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rdesc->ramp_delay = rdesc->enable_time;
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/* parse volt_table */
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rdesc->n_voltages = of_property_count_u32_elems(np, "voltage-table");
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v_table = devm_kzalloc(dev, sizeof(unsigned int) * rdesc->n_voltages,
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GFP_KERNEL);
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if (unlikely(!v_table))
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return -ENOMEM;
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rdesc->volt_table = v_table;
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ret = of_property_read_u32_array(np, "voltage-table",
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v_table, rdesc->n_voltages);
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if (ret) {
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dev_err(dev, "missing voltage-table property\n");
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return ret;
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}
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/*
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* Instead of explicitly requiring a mask for the voltage selector,
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* as they all start from bit zero (at least on the known LDOs),
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* just use the number of voltages at the voltage table, getting the
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* minimal mask that would pick everything.
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*/
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rdesc->vsel_mask = (1 << (fls(rdesc->n_voltages) - 1)) - 1;
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dev_dbg(dev, "voltage selector settings: reg: 0x%x, mask: 0x%x\n",
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rdesc->vsel_reg, rdesc->vsel_mask);
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return 0;
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}
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static const struct regulator_ops hi6421_spmi_ldo_rops = {
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.is_enabled = hi6421_spmi_regulator_is_enabled,
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.enable = hi6421_spmi_regulator_enable,
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.disable = hi6421_spmi_regulator_disable,
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.list_voltage = regulator_list_voltage_table,
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.map_voltage = regulator_map_voltage_iterate,
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.get_voltage_sel = hi6421_spmi_regulator_get_voltage_sel,
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.set_voltage_sel = hi6421_spmi_regulator_set_voltage_sel,
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.get_mode = hi6421_spmi_regulator_get_mode,
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.set_mode = hi6421_spmi_regulator_set_mode,
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.get_optimum_mode = hi6421_spmi_regulator_get_optimum_mode,
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};
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static int hi6421_spmi_regulator_probe_ldo(struct platform_device *pdev,
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struct device_node *np,
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struct hi6421_spmi_pmic *pmic)
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{
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struct regulation_constraints *constraint;
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struct regulator_init_data *initdata;
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struct regulator_config config = { };
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struct hi6421v600_regulator *sreg;
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struct device *dev = &pdev->dev;
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struct regulator_desc *rdesc;
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struct regulator_dev *rdev;
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const char *supplyname;
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int ret;
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initdata = of_get_regulator_init_data(dev, np, NULL);
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if (!initdata) {
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dev_err(dev, "failed to get regulator data\n");
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return -EINVAL;
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}
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sreg = devm_kzalloc(dev, sizeof(*sreg), GFP_KERNEL);
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if (!sreg)
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return -ENOMEM;
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sreg->pmic = pmic;
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rdesc = &sreg->rdesc;
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rdesc->name = initdata->constraints.name;
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rdesc->ops = &hi6421_spmi_ldo_rops;
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rdesc->type = REGULATOR_VOLTAGE;
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rdesc->min_uV = initdata->constraints.min_uV;
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supplyname = of_get_property(np, "supply_name", NULL);
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if (supplyname)
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initdata->supply_regulator = supplyname;
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/* parse device tree data for regulator specific */
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ret = hi6421_spmi_dt_parse(pdev, sreg, rdesc);
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if (ret)
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return ret;
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/* hisi regulator supports two modes */
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constraint = &initdata->constraints;
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constraint->valid_modes_mask = REGULATOR_MODE_NORMAL;
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if (sreg->eco_mode_mask) {
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constraint->valid_modes_mask |= REGULATOR_MODE_IDLE;
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constraint->valid_ops_mask |= REGULATOR_CHANGE_MODE;
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}
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config.dev = &pdev->dev;
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config.init_data = initdata;
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config.driver_data = sreg;
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config.of_node = pdev->dev.of_node;
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/* register regulator */
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rdev = regulator_register(rdesc, &config);
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if (IS_ERR(rdev)) {
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dev_err(dev, "failed to register %s\n",
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rdesc->name);
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return PTR_ERR(rdev);
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}
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rdev_dbg(rdev, "valid_modes_mask: 0x%x, valid_ops_mask: 0x%x\n",
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constraint->valid_modes_mask, constraint->valid_ops_mask);
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dev_set_drvdata(dev, rdev);
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return 0;
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}
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static int hi6421_spmi_regulator_probe(struct platform_device *pdev)
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{
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struct device *pmic_dev = pdev->dev.parent;
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struct device_node *np = pmic_dev->of_node;
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struct device_node *regulators, *child;
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struct platform_device *new_pdev;
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struct hi6421_spmi_pmic *pmic;
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int ret;
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/*
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* This driver is meant to be called by hi6421-spmi-core,
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* which should first set drvdata. If this doesn't happen, hit
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* a warn on and return.
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*/
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pmic = dev_get_drvdata(pmic_dev);
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if (WARN_ON(!pmic))
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return -ENODEV;
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regulators = of_get_child_by_name(np, "regulators");
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if (!regulators) {
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dev_err(&pdev->dev, "regulator node not found\n");
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return -ENODEV;
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}
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/*
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* Parse all LDO regulator nodes
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*/
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for_each_child_of_node(regulators, child) {
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dev_dbg(&pdev->dev, "adding child %pOF\n", child);
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new_pdev = platform_device_alloc(child->name, -1);
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new_pdev->dev.parent = pmic_dev;
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new_pdev->dev.of_node = of_node_get(child);
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ret = platform_device_add(new_pdev);
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if (ret < 0) {
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platform_device_put(new_pdev);
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continue;
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}
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ret = hi6421_spmi_regulator_probe_ldo(new_pdev, child, pmic);
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if (ret < 0)
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platform_device_put(new_pdev);
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}
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of_node_put(regulators);
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return 0;
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}
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static int hi6421_spmi_regulator_remove(struct platform_device *pdev)
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{
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struct regulator_dev *rdev = dev_get_drvdata(&pdev->dev);
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struct hi6421v600_regulator *sreg = rdev_get_drvdata(rdev);
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regulator_unregister(rdev);
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if (rdev->desc->volt_table)
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devm_kfree(&pdev->dev, (unsigned int *)rdev->desc->volt_table);
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kfree(sreg);
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return 0;
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}
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static const struct platform_device_id hi6421v600_regulator_table[] = {
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{ .name = "hi6421v600-regulator" },
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{},
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};
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MODULE_DEVICE_TABLE(platform, hi6421v600_regulator_table);
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static struct platform_driver hi6421v600_regulator_driver = {
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.id_table = hi6421v600_regulator_table,
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.driver = {
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.name = "hi6421v600-regulator",
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},
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.probe = hi6421_spmi_regulator_probe,
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.remove = hi6421_spmi_regulator_remove,
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};
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module_platform_driver(hi6421v600_regulator_driver);
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MODULE_DESCRIPTION("Hi6421v600 regulator driver");
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MODULE_LICENSE("GPL v2");
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