drivers/regulator/rt4803.c

Source file repositories/reference/linux-study-clean/drivers/regulator/rt4803.c

File Facts

System
Linux kernel
Corpus path
drivers/regulator/rt4803.c
Extension
.c
Size
5496 bytes
Lines
217
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) 2023 Richtek Technology Corp.
 *
 * Author: ChiYuan Huang <cy_huang@richtek.com>
 */

#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>

#define RT4803_AUTO_MODE	1
#define RT4803_FPWM_MODE	2

#define RT4803_REG_CONFIG	0x01
#define RT4803_REG_VSELL	0x02
#define RT4803_REG_VSELH	0x03
#define RT4803_REG_ILIM		0x04
#define RT4803_REG_STAT		0x05

#define RT4803_MODE_MASK	GENMASK(1, 0)
#define RT4803_VSEL_MASK	GENMASK(4, 0)
#define RT4803_ILIM_MASK	GENMASK(3, 0)
#define RT4803_TSD_MASK		BIT(7)
#define RT4803_HOTDIE_MASK	BIT(6)
#define RT4803_FAULT_MASK	BIT(1)
#define RT4803_PGOOD_MASK	BIT(0)

#define RT4803_VOUT_MINUV	2850000
#define RT4803_VOUT_STEPUV	50000
#define RT4803_VOUT_NUM		32

static int rt4803_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
	struct regmap *regmap = rdev_get_regmap(rdev);
	unsigned int modeval;

	switch (mode) {
	case REGULATOR_MODE_NORMAL:
		modeval = RT4803_AUTO_MODE;
		break;
	case REGULATOR_MODE_FAST:
		modeval = RT4803_FPWM_MODE;
		break;
	default:
		return -EINVAL;
	}

	modeval <<= ffs(RT4803_MODE_MASK) - 1;

	return regmap_update_bits(regmap, RT4803_REG_CONFIG, RT4803_MODE_MASK, modeval);
}

static unsigned int rt4803_get_mode(struct regulator_dev *rdev)
{
	struct regmap *regmap = rdev_get_regmap(rdev);
	unsigned int modeval;
	int ret;

	ret = regmap_read(regmap, RT4803_REG_CONFIG, &modeval);
	if (ret)
		return REGULATOR_MODE_INVALID;

	modeval >>= ffs(RT4803_MODE_MASK) - 1;

	switch (modeval) {
	case RT4803_AUTO_MODE:
		return REGULATOR_MODE_NORMAL;
	case RT4803_FPWM_MODE:
		return REGULATOR_MODE_FAST;
	default:
		return REGULATOR_MODE_INVALID;
	}
}

static int rt4803_get_error_flags(struct regulator_dev *rdev, unsigned int *flags)
{
	struct regmap *regmap = rdev_get_regmap(rdev);
	unsigned int state, events = 0;
	int ret;

	ret = regmap_read(regmap, RT4803_REG_STAT, &state);
	if (ret)
		return ret;

Annotation

Implementation Notes