drivers/mfd/88pm886.c

Source file repositories/reference/linux-study-clean/drivers/mfd/88pm886.c

File Facts

System
Linux kernel
Corpus path
drivers/mfd/88pm886.c
Extension
.c
Size
4212 bytes
Lines
155
Domain
Driver Families
Bucket
drivers/mfd
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
#include <linux/i2c.h>
#include <linux/mfd/core.h>
#include <linux/module.h>
#include <linux/notifier.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/regmap.h>

#include <linux/mfd/88pm886.h>

static const struct regmap_config pm886_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = PM886_REG_RTC_SPARE6,
};

static const struct regmap_irq pm886_regmap_irqs[] = {
	REGMAP_IRQ_REG(PM886_IRQ_ONKEY, 0, PM886_INT_ENA1_ONKEY),
};

static const struct regmap_irq_chip pm886_regmap_irq_chip = {
	.name = "88pm886",
	.irqs = pm886_regmap_irqs,
	.num_irqs = ARRAY_SIZE(pm886_regmap_irqs),
	.num_regs = 4,
	.status_base = PM886_REG_INT_STATUS1,
	.ack_base = PM886_REG_INT_STATUS1,
	.unmask_base = PM886_REG_INT_ENA_1,
};

static const struct resource pm886_onkey_resources[] = {
	DEFINE_RES_IRQ_NAMED(PM886_IRQ_ONKEY, "88pm886-onkey"),
};

static const struct mfd_cell pm886_devs[] = {
	MFD_CELL_NAME("88pm886-gpadc"),
	MFD_CELL_RES("88pm886-onkey", pm886_onkey_resources),
	MFD_CELL_NAME("88pm886-regulator"),
	MFD_CELL_NAME("88pm886-rtc"),
};

static int pm886_power_off_handler(struct sys_off_data *sys_off_data)
{
	struct pm886_chip *chip = sys_off_data->cb_data;
	struct regmap *regmap = chip->regmap;
	struct device *dev = &chip->client->dev;
	int err;

	err = regmap_update_bits(regmap, PM886_REG_MISC_CONFIG1, PM886_SW_PDOWN, PM886_SW_PDOWN);
	if (err) {
		dev_err(dev, "Failed to power off the device: %d\n", err);
		return NOTIFY_BAD;
	}
	return NOTIFY_DONE;
}

static int pm886_setup_irq(struct pm886_chip *chip,
		struct regmap_irq_chip_data **irq_data)
{
	struct regmap *regmap = chip->regmap;
	struct device *dev = &chip->client->dev;
	int err;

	/* Set interrupt clearing mode to clear on write. */
	err = regmap_update_bits(regmap, PM886_REG_MISC_CONFIG2,
			PM886_INT_INV | PM886_INT_CLEAR | PM886_INT_MASK_MODE,
			PM886_INT_WC);
	if (err) {
		dev_err(dev, "Failed to set interrupt clearing mode: %d\n", err);
		return err;
	}

	err = devm_regmap_add_irq_chip(dev, regmap, chip->client->irq,
					IRQF_ONESHOT, 0, &pm886_regmap_irq_chip,
					irq_data);
	if (err) {
		dev_err(dev, "Failed to request IRQ: %d\n", err);
		return err;
	}

	return 0;
}

static int pm886_probe(struct i2c_client *client)
{
	struct regmap_irq_chip_data *irq_data;
	struct device *dev = &client->dev;
	struct pm886_chip *chip;

Annotation

Implementation Notes