drivers/regulator/qcom-refgen-regulator.c

Source file repositories/reference/linux-study-clean/drivers/regulator/qcom-refgen-regulator.c

File Facts

System
Linux kernel
Corpus path
drivers/regulator/qcom-refgen-regulator.c
Extension
.c
Size
4248 bytes
Lines
155
Domain
Driver Families
Bucket
drivers/regulator
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-only
// Copyright (c) 2017, 2019-2020, The Linux Foundation. All rights reserved.
// Copyright (c) 2023, Linaro Limited

#include <linux/bitfield.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>

#define REFGEN_REG_BIAS_EN		0x08
#define REFGEN_BIAS_EN_MASK		GENMASK(2, 0)
 #define REFGEN_BIAS_EN_ENABLE		0x7
 #define REFGEN_BIAS_EN_DISABLE		0x6

#define REFGEN_REG_BG_CTRL		0x14
#define REFGEN_BG_CTRL_MASK		GENMASK(2, 1)
 #define REFGEN_BG_CTRL_ENABLE		0x3
 #define REFGEN_BG_CTRL_DISABLE		0x2

#define REFGEN_REG_PWRDWN_CTRL5		0x80
#define REFGEN_PWRDWN_CTRL5_MASK	BIT(0)
 #define REFGEN_PWRDWN_CTRL5_ENABLE	0x1

static int qcom_sdm845_refgen_enable(struct regulator_dev *rdev)
{
	regmap_update_bits(rdev->regmap, REFGEN_REG_BG_CTRL, REFGEN_BG_CTRL_MASK,
			   FIELD_PREP(REFGEN_BG_CTRL_MASK, REFGEN_BG_CTRL_ENABLE));

	regmap_write(rdev->regmap, REFGEN_REG_BIAS_EN,
		     FIELD_PREP(REFGEN_BIAS_EN_MASK, REFGEN_BIAS_EN_ENABLE));

	return 0;
}

static int qcom_sdm845_refgen_disable(struct regulator_dev *rdev)
{
	regmap_write(rdev->regmap, REFGEN_REG_BIAS_EN,
		     FIELD_PREP(REFGEN_BIAS_EN_MASK, REFGEN_BIAS_EN_DISABLE));

	regmap_update_bits(rdev->regmap, REFGEN_REG_BG_CTRL, REFGEN_BG_CTRL_MASK,
			   FIELD_PREP(REFGEN_BG_CTRL_MASK, REFGEN_BG_CTRL_DISABLE));

	return 0;
}

static int qcom_sdm845_refgen_is_enabled(struct regulator_dev *rdev)
{
	u32 val;

	regmap_read(rdev->regmap, REFGEN_REG_BG_CTRL, &val);
	if (FIELD_GET(REFGEN_BG_CTRL_MASK, val) != REFGEN_BG_CTRL_ENABLE)
		return 0;

	regmap_read(rdev->regmap, REFGEN_REG_BIAS_EN, &val);
	if (FIELD_GET(REFGEN_BIAS_EN_MASK, val) != REFGEN_BIAS_EN_ENABLE)
		return 0;

	return 1;
}

static const struct regulator_desc sdm845_refgen_desc = {
	.enable_time = 5,
	.name = "refgen",
	.owner = THIS_MODULE,
	.type = REGULATOR_VOLTAGE,
	.ops = &(const struct regulator_ops) {
		.enable		= qcom_sdm845_refgen_enable,
		.disable	= qcom_sdm845_refgen_disable,
		.is_enabled	= qcom_sdm845_refgen_is_enabled,
	},
};

static const struct regulator_desc sm8250_refgen_desc = {
	.enable_reg = REFGEN_REG_PWRDWN_CTRL5,
	.enable_mask = REFGEN_PWRDWN_CTRL5_MASK,
	.enable_val = REFGEN_PWRDWN_CTRL5_ENABLE,
	.disable_val = 0,
	.enable_time = 5,
	.name = "refgen",
	.owner = THIS_MODULE,
	.type = REGULATOR_VOLTAGE,
	.ops = &(const struct regulator_ops) {
		.enable		= regulator_enable_regmap,
		.disable	= regulator_disable_regmap,
		.is_enabled	= regulator_is_enabled_regmap,
	},

Annotation

Implementation Notes