Release 4.14 drivers/mfd/lp8788-irq.c

Directory: drivers/mfd
/*
 * TI LP8788 MFD - interrupt handler
 *
 * Copyright 2012 Texas Instruments
 *
 * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#include <linux/delay.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/device.h>
#include <linux/mfd/lp8788.h>
#include <linux/module.h>
#include <linux/slab.h>

/* register address */

#define LP8788_INT_1			0x00

#define LP8788_INTEN_1			0x03


#define BASE_INTEN_ADDR			LP8788_INTEN_1

#define SIZE_REG			8

#define NUM_REGS			3

/*
 * struct lp8788_irq_data
 * @lp               : used for accessing to lp8788 registers
 * @irq_lock         : mutex for enabling/disabling the interrupt
 * @domain           : IRQ domain for handling nested interrupt
 * @enabled          : status of enabled interrupt
 */

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;
}

Contributors
Person Tokens Prop Commits CommitProp
Kim (Woogyom) Milo 16 100.00% 1 100.00%
Total 16 100.00% 1 100.00%



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

Contributors
Person Tokens Prop Commits CommitProp
Kim (Woogyom) Milo 19 100.00% 1 100.00%
Total 19 100.00% 1 100.00%



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

Contributors
Person Tokens Prop Commits CommitProp
Kim (Woogyom) Milo 20 100.00% 1 100.00%
Total 20 100.00% 1 100.00%



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

Contributors
Person Tokens Prop Commits CommitProp
Kim (Woogyom) Milo 23 100.00% 1 100.00%
Total 23 100.00% 1 100.00%



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;
}

Contributors
Person Tokens Prop Commits CommitProp
Kim (Woogyom) Milo 32 100.00% 1 100.00%
Total 32 100.00% 1 100.00%



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;
}

Contributors
Person Tokens Prop Commits CommitProp
Kim (Woogyom) Milo 32 100.00% 1 100.00%
Total 32 100.00% 1 100.00%



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);
}

Contributors
Person Tokens Prop Commits CommitProp
Kim (Woogyom) Milo 29 100.00% 1 100.00%
Total 29 100.00% 1 100.00%



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);
}

Contributors
Person Tokens Prop Commits CommitProp
Kim (Woogyom) Milo 85 100.00% 1 100.00%
Total 85 100.00% 1 100.00%


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;
		}
	}

	return handled ? IRQ_HANDLED : IRQ_NONE;
}

Contributors
Person Tokens Prop Commits CommitProp
Kim (Woogyom) Milo 125 98.43% 1 50.00%
Dan Carpenter 2 1.57% 1 50.00%
Total 127 100.00% 2 100.00%



static int lp8788_irq_map(struct irq_domain *d, unsigned int virq,
			irq_hw_number_t hwirq)
{
	struct lp8788_irq_data *irqd = d->host_data;
	struct irq_chip *chip = &lp8788_irq_chip;

	irq_set_chip_data(virq, irqd);
	irq_set_chip_and_handler(virq, chip, handle_edge_irq);
	irq_set_nested_thread(virq, 1);
	irq_set_noprobe(virq);

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Kim (Woogyom) Milo 66 100.00% 1 100.00%
Total 66 100.00% 1 100.00%


static const struct irq_domain_ops lp8788_domain_ops = {
	.map = lp8788_irq_map,
};



int lp8788_irq_init(struct lp8788 *lp, int irq)
{
	struct lp8788_irq_data *irqd;
	int ret;

	if (irq <= 0) {
		dev_warn(lp->dev, "invalid irq number: %d\n", irq);
		return 0;
	}

	irqd = devm_kzalloc(lp->dev, sizeof(*irqd), GFP_KERNEL);
	if (!irqd)
		return -ENOMEM;

	irqd->lp = lp;
	irqd->domain = irq_domain_add_linear(lp->dev->of_node, LP8788_INT_MAX,
					&lp8788_domain_ops, irqd);
	if (!irqd->domain) {
		dev_err(lp->dev, "failed to add irq domain err\n");
		return -EINVAL;
	}

	lp->irqdm = irqd->domain;
	mutex_init(&irqd->irq_lock);

	ret = request_threaded_irq(irq, NULL, lp8788_irq_handler,
				IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
				"lp8788-irq", irqd);
	if (ret) {
		dev_err(lp->dev, "failed to create a thread for IRQ_N\n");
		return ret;
	}

	lp->irq = irq;

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Kim (Woogyom) Milo 179 100.00% 1 100.00%
Total 179 100.00% 1 100.00%



void lp8788_irq_exit(struct lp8788 *lp)
{
	if (lp->irq)
		free_irq(lp->irq, lp->irqdm);
}
Contributors
Person Tokens Prop Commits CommitProp
Kim (Woogyom) Milo 27 100.00% 1 100.00%
Total 27 100.00% 1 100.00%

Overall Contributors
Person Tokens Prop Commits CommitProp
Kim (Woogyom) Milo 772 99.61% 1 33.33%
Dan Carpenter 2 0.26% 1 33.33%
Krzysztof Kozlowski 1 0.13% 1 33.33%
Total 775 100.00% 3 100.00%
Directory: drivers/mfd

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.
Person	Tokens	Prop	Commits	CommitProp
Kim (Woogyom) Milo	16	100.00%	1	100.00%
Total	16	100.00%	1	100.00%
cregit-Linux how code gets into the kernel

Release 4.14 drivers/mfd/lp8788-irq.c

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Overall Contributors
