path: root/drivers/base/regmap/regmap-irq.c

// SPDX-License-Identifier: GPL-2.0
//
// regmap based irq_chip
//
// Copyright 2011 Wolfson Microelectronics plc
//
// Author: Mark Brown <broonie@opensource.wolfsonmicro.com>

#include <linux/device.h>
#include <linux/export.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/slab.h>

#include "internal.h"

struct regmap_irq_chip_data {
	struct mutex lock;
	struct irq_chip irq_chip;

	struct regmap *map;
	const struct regmap_irq_chip *chip;

	int irq_base;
	struct irq_domain *domain;

	int irq;
	int wake_count;

	unsigned int mask_base;
	unsigned int unmask_base;

	void *status_reg_buf;
	unsigned int *main_status_buf;
	unsigned int *status_buf;
	unsigned int *mask_buf;
	unsigned int *mask_buf_def;
	unsigned int *wake_buf;
	unsigned int *type_buf;
	unsigned int *type_buf_def;
	unsigned int **virt_buf;
	unsigned int **config_buf;

	unsigned int irq_reg_stride;

	unsigned int (*get_irq_reg)(struct regmap_irq_chip_data *data,
				    unsigned int base, int index);

	unsigned int clear_status:1;
};

static inline const
struct regmap_irq *irq_to_regmap_irq(struct regmap_irq_chip_data *data,
				     int irq)
{
	return &data->chip->irqs[irq];
}

static bool regmap_irq_can_bulk_read_status(struct regmap_irq_chip_data *data)
{
	struct regmap *map = data->map;

	/*
	 * While possible that a user-defined ->get_irq_reg() callback might
	 * be linear enough to support bulk reads, most of the time it won't.
	 * Therefore only allow them if the default callback is being used.
	 */
	return data->irq_reg_stride == 1 && map->reg_stride == 1 &&
	       data->get_irq_reg == regmap_irq_get_irq_reg_linear &&
	       !map->use_single_read;
}

static void regmap_irq_lock(struct irq_data *data)
{
	struct regmap_irq_chip_data *d = irq_data_get_irq_chip_data(data);