/*
* Interrupt controller support for MAX8998
*
* Copyright (C) 2010 Samsung Electronics Co.Ltd
* Author: Joonyoung Shim <jy0922.shim@samsung.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
*/
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/mfd/max8998-private.h>
struct max8998_irq_data {
int reg;
int mask;
};
static struct max8998_irq_data max8998_irqs[] = {
[MAX8998_IRQ_DCINF] = {
.reg = 1,
.mask = MAX8998_IRQ_DCINF_MASK,
},
[MAX8998_IRQ_DCINR] = {
.reg = 1,
.mask = MAX8998_IRQ_DCINR_MASK,
},
[MAX8998_IRQ_JIGF] = {
.reg = 1,
.mask = MAX8998_IRQ_JIGF_MASK,
},
[MAX8998_IRQ_JIGR] = {
.reg = 1,
.mask = MAX8998_IRQ_JIGR_MASK,
},
[MAX8998_IRQ_PWRONF] = {
.reg = 1,
.mask = MAX8998_IRQ_PWRONF_MASK,
},
[MAX8998_IRQ_PWRONR] = {
.reg = 1,
.mask = MAX8998_IRQ_PWRONR_MASK,
},
[MAX8998_IRQ_WTSREVNT] = {
.reg = 2,
.mask = MAX8998_IRQ_WTSREVNT_MASK,
},
[MAX8998_IRQ_SMPLEVNT] = {
.reg = 2,
.mask = MAX8998_IRQ_SMPLEVNT_MASK,
},
[MAX8998_IRQ_ALARM1] = {
.reg = 2,
.mask = MAX8998_IRQ_ALARM1_MASK,
},
[MAX8998_IRQ_ALARM0] = {
.reg = 2,
.mask = MAX8998_IRQ_ALARM0_MASK,
},
[MAX8998_IRQ_ONKEY1S] = {
.reg = 3,
.mask = MAX8998_IRQ_ONKEY1S_MASK,
},
[MAX8998_IRQ_TOPOFFR] = {
.reg = 3,
.mask = MAX8998_IRQ_TOPOFFR_MASK,
},
[MAX8998_IRQ_DCINOVPR] = {
.reg = 3,
.mask = MAX8998_IRQ_DCINOVPR_MASK,
},
[MAX8998_IRQ_CHGRSTF] = {
.reg = 3,
.mask = MAX8998_IRQ_CHGRSTF_MASK,
},
[MAX8998_IRQ_DONER] = {
.reg = 3,
.mask = MAX8998_IRQ_DONER_MASK,
},
[MAX8998_IRQ_CHGFAULT] = {
.reg = 3,
.mask = MAX8998_IRQ_CHGFAULT_MASK,
},
[MAX8998_IRQ_LOBAT1] = {
.reg = 4,
.mask = MAX8998_IRQ_LOBAT1_MASK,
},
[MAX8998_IRQ_LOBAT2] = {
.reg = 4,
.mask = MAX8998_IRQ_LOBAT2_MASK,
},
};
static inline struct max8998_irq_data *
irq_to_max8998_irq(struct max8998_dev *max8998, int irq)
{
return &max8998_irqs[irq - max8998->irq_base];
}
static void max8998_irq_lock(struct irq_data *data)
{
struct max8998_dev *max8998 = irq_data_get_irq_chip_data(data);
mutex_lock(&max8998->irqlock);
}
static void max8998_irq_sync_unlock(struct irq_data *data)
{
struct max8998_dev *max8998 = irq_data_get_irq_chip_data(data);
int i;
for (i = 0; i < ARRAY_SIZE(max8998->irq_masks_cur); i++) {
/*
* If there's been a change in the mask write it back
* to the hardware.
*/
if (max8998->irq_masks_cur[i] != max8998->irq_masks_cache[i]) {
max8998->irq_masks_cache[i] = max8998->irq_masks_cur[i];
max8998_write_reg(max8998->i2c, MAX8998_REG_IRQM1 + i,
max8998->irq_masks_cur[i]);
}
}
mutex_unlock(&max8998->irqlock);
}
static void max8998_irq_unmask(struct irq_data *data)
{
struct max8998_dev *max8998 = irq_data_get_irq_chip_data(data);
struct max8998_irq_data *irq_data = irq_to_max8998_irq(max8998,
data->irq);
max8998->irq_masks_cur[irq_data->reg - 1] &= ~irq_data->mask;
}
static void max8998_irq_mask(struct irq_data *data)
{
struct max8998_dev *max8998 = irq_data_get_irq_chip_data(data);
struct max8998_irq_data *irq_data = irq_to_max8998_irq(max8998,
data->irq);
max8998->irq_masks_cur[irq_data->reg - 1] |= irq_data->mask;
}
static struct irq_chip max8998_irq_chip = {
.name = "max8998",
.irq_bus_lock = max8998_irq_lock,
.irq_bus_sync_unlock = max8998_irq_sync_unlock,
.irq_mask = max8998_irq_mask,
.irq_unmask = max8998_irq_unmask,
};
static irqreturn_t max8998_irq_thread(int irq, void *data)
{
struct max8998_dev *max8998 = data;
u8 irq_reg[MAX8998_NUM_IRQ_REGS];
int ret;
int i;
ret = max8998_bulk_read(max8998->i2c, MAX8998_REG_IRQ1,
MAX8998_NUM_IRQ_REGS, irq_reg);
if (ret < 0) {
dev_err(max8998->dev, "Failed to read interrupt register: %d\n",
ret);
return IRQ_NONE;
}
/* Apply masking */
for (i = 0; i < MAX8998_NUM_IRQ_REGS; i++)
irq_reg[i] &= ~max8998->irq_masks_cur[i];
/* Report */
for (i = 0; i < MAX8998_IRQ_NR; i++) {
if (irq_reg[max8998_irqs[i].reg - 1] & max8998_irqs[i].mask)
handle_nested_irq(max8998->irq_base + i);
}
return IRQ_HANDLED;
}
int max8998_irq_resume(struct max8998_dev *max8998)
{
if (max8998->irq && max8998->irq_base)
max8998_irq_thread(max8998->irq_base, max8998);
return 0;
}
int max8998_irq_init(struct max8998_dev *max8998)
{
int i;
int cur_irq;
int ret;
if (!max8998->irq) {
dev_warn(max8998->dev,
"No interrupt specified, no interrupts\n");
max8998->irq_base = 0;
return 0;
}
if (!max8998->irq_base) {
dev_err(max8998->dev,
"No interrupt base specified, no interrupts\n");
return 0;
}
mutex_init(&max8998->irqlock);
/* Mask the individual interrupt sources */
for (i = 0; i < MAX8998_NUM_IRQ_REGS; i++) {
max8998->irq_masks_cur[i] = 0xff;
max8998->irq_masks_cache[i] = 0xff;
max8998_write_reg(max8998->i2c, MAX8998_REG_IRQM1 + i, 0xff);
}
max8998_write_reg(max8998->i2c, MAX8998_REG_STATUSM1, 0xff);
max8998_write_reg(max8998->i2c, MAX8998_REG_STATUSM2, 0xff);
/* register with genirq */
for (i = 0; i < MAX8998_IRQ_NR; i++) {
cur_irq = i + max8998->irq_base;
irq_set_chip_data(cur_irq, max8998);
irq_set_chip_and_handler(cur_irq, &max8998_irq_chip,
handle_edge_irq);
irq_set_nested_thread(cur_irq, 1);
#ifdef CONFIG_ARM
set_irq_flags(cur_irq, IRQF_VALID);
#else
irq_set_noprobe(cur_irq);
#endif
}
ret = request_threaded_irq(max8998->irq, NULL, max8998_irq_thread,
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
"max8998-irq", max8998);
if (ret) {
dev_err(max8998->dev, "Failed to request IRQ %d: %d\n",
max8998->irq, ret);
return ret;
}
if (!max8998->ono)
return 0;
ret = request_threaded_irq(max8998->ono, NULL, max8998_irq_thread,
IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
IRQF_ONESHOT, "max8998-ono", max8998);
if (ret)
dev_err(max8998->dev, "Failed to request IRQ %d: %d\n",
max8998->ono, ret);
return 0;
}
void max8998_irq_exit(struct max8998_dev *max8998)
{
if (max8998->ono)
free_irq(max8998->ono, max8998);
if (max8998->irq)
free_irq(max8998->irq, max8998);
}