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/*
* 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;
}
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;
}
}
return handled ? IRQ_HANDLED : IRQ_NONE;
}
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;
}
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;
}
void lp8788_irq_exit(struct lp8788 *lp)
{
if (lp->irq)
free_irq(lp->irq, lp->irqdm);
}
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