drivers/mfd/lp8788-irq.c

Source file repositories/reference/linux-study-clean/drivers/mfd/lp8788-irq.c

File Facts

System
Linux kernel
Corpus path
drivers/mfd/lp8788-irq.c
Extension
.c
Size
4428 bytes
Lines
195
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

struct lp8788_irq_data {
	struct lp8788 *lp;
	struct mutex irq_lock;
	struct irq_domain *domain;
	int enabled[LP8788_INT_MAX];
};

static inline u8 _irq_to_addr(enum lp8788_int_id id)
{
	return id / SIZE_REG;
}

static inline u8 _irq_to_enable_addr(enum lp8788_int_id id)
{
	return _irq_to_addr(id) + BASE_INTEN_ADDR;
}

static inline u8 _irq_to_mask(enum lp8788_int_id id)
{
	return 1 << (id % SIZE_REG);
}

static inline u8 _irq_to_val(enum lp8788_int_id id, int enable)
{
	return enable << (id % SIZE_REG);
}

static void lp8788_irq_enable(struct irq_data *data)
{
	struct lp8788_irq_data *irqd = irq_data_get_irq_chip_data(data);

	irqd->enabled[data->hwirq] = 1;
}

static void lp8788_irq_disable(struct irq_data *data)
{
	struct lp8788_irq_data *irqd = irq_data_get_irq_chip_data(data);

	irqd->enabled[data->hwirq] = 0;
}

static void lp8788_irq_bus_lock(struct irq_data *data)
{
	struct lp8788_irq_data *irqd = irq_data_get_irq_chip_data(data);

	mutex_lock(&irqd->irq_lock);
}

static void lp8788_irq_bus_sync_unlock(struct irq_data *data)
{
	struct lp8788_irq_data *irqd = irq_data_get_irq_chip_data(data);
	enum lp8788_int_id irq = data->hwirq;
	u8 addr, mask, val;

	addr = _irq_to_enable_addr(irq);
	mask = _irq_to_mask(irq);
	val = _irq_to_val(irq, irqd->enabled[irq]);

	lp8788_update_bits(irqd->lp, addr, mask, val);

	mutex_unlock(&irqd->irq_lock);
}

static struct irq_chip lp8788_irq_chip = {
	.name			= "lp8788",
	.irq_enable		= lp8788_irq_enable,
	.irq_disable		= lp8788_irq_disable,
	.irq_bus_lock		= lp8788_irq_bus_lock,
	.irq_bus_sync_unlock	= lp8788_irq_bus_sync_unlock,
};

static irqreturn_t lp8788_irq_handler(int irq, void *ptr)
{
	struct lp8788_irq_data *irqd = ptr;
	struct lp8788 *lp = irqd->lp;
	u8 status[NUM_REGS], addr, mask;
	bool handled = false;
	int i;

	if (lp8788_read_multi_bytes(lp, LP8788_INT_1, status, NUM_REGS))
		return IRQ_NONE;

	for (i = 0 ; i < LP8788_INT_MAX ; i++) {
		addr = _irq_to_addr(i);
		mask = _irq_to_mask(i);

		/* reporting only if the irq is enabled */
		if (status[addr] & mask) {
			handle_nested_irq(irq_find_mapping(irqd->domain, i));
			handled = true;

Annotation

Implementation Notes