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max8997-irq.c
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max8997-irq.c
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/*
* max8997-irq.c - Interrupt controller support for MAX8997
*
* Copyright (C) 2011 Samsung Electronics Co.Ltd
* MyungJoo Ham <[email protected]>
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* This driver is based on max8998-irq.c
*/
#include <linux/err.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/mfd/max8997.h>
#include <linux/mfd/max8997-private.h>
static const u8 max8997_mask_reg[] = {
[PMIC_INT1] = MAX8997_REG_INT1MSK,
[PMIC_INT2] = MAX8997_REG_INT2MSK,
[PMIC_INT3] = MAX8997_REG_INT3MSK,
[PMIC_INT4] = MAX8997_REG_INT4MSK,
[FUEL_GAUGE] = MAX8997_REG_INVALID,
[MUIC_INT1] = MAX8997_MUIC_REG_INTMASK1,
[MUIC_INT2] = MAX8997_MUIC_REG_INTMASK2,
[MUIC_INT3] = MAX8997_MUIC_REG_INTMASK3,
[GPIO_LOW] = MAX8997_REG_INVALID,
[GPIO_HI] = MAX8997_REG_INVALID,
[FLASH_STATUS] = MAX8997_REG_INVALID,
};
static struct i2c_client *get_i2c(struct max8997_dev *max8997,
enum max8997_irq_source src)
{
switch (src) {
case PMIC_INT1 ... PMIC_INT4:
return max8997->i2c;
case FUEL_GAUGE:
return NULL;
case MUIC_INT1 ... MUIC_INT3:
return max8997->muic;
case GPIO_LOW ... GPIO_HI:
return max8997->i2c;
case FLASH_STATUS:
return max8997->i2c;
default:
return ERR_PTR(-EINVAL);
}
}
struct max8997_irq_data {
int mask;
enum max8997_irq_source group;
};
#define DECLARE_IRQ(idx, _group, _mask) \
[(idx)] = { .group = (_group), .mask = (_mask) }
static const struct max8997_irq_data max8997_irqs[] = {
DECLARE_IRQ(MAX8997_PMICIRQ_PWRONR, PMIC_INT1, 1 << 0),
DECLARE_IRQ(MAX8997_PMICIRQ_PWRONF, PMIC_INT1, 1 << 1),
DECLARE_IRQ(MAX8997_PMICIRQ_PWRON1SEC, PMIC_INT1, 1 << 3),
DECLARE_IRQ(MAX8997_PMICIRQ_JIGONR, PMIC_INT1, 1 << 4),
DECLARE_IRQ(MAX8997_PMICIRQ_JIGONF, PMIC_INT1, 1 << 5),
DECLARE_IRQ(MAX8997_PMICIRQ_LOWBAT2, PMIC_INT1, 1 << 6),
DECLARE_IRQ(MAX8997_PMICIRQ_LOWBAT1, PMIC_INT1, 1 << 7),
DECLARE_IRQ(MAX8997_PMICIRQ_JIGR, PMIC_INT2, 1 << 0),
DECLARE_IRQ(MAX8997_PMICIRQ_JIGF, PMIC_INT2, 1 << 1),
DECLARE_IRQ(MAX8997_PMICIRQ_MR, PMIC_INT2, 1 << 2),
DECLARE_IRQ(MAX8997_PMICIRQ_DVS1OK, PMIC_INT2, 1 << 3),
DECLARE_IRQ(MAX8997_PMICIRQ_DVS2OK, PMIC_INT2, 1 << 4),
DECLARE_IRQ(MAX8997_PMICIRQ_DVS3OK, PMIC_INT2, 1 << 5),
DECLARE_IRQ(MAX8997_PMICIRQ_DVS4OK, PMIC_INT2, 1 << 6),
DECLARE_IRQ(MAX8997_PMICIRQ_CHGINS, PMIC_INT3, 1 << 0),
DECLARE_IRQ(MAX8997_PMICIRQ_CHGRM, PMIC_INT3, 1 << 1),
DECLARE_IRQ(MAX8997_PMICIRQ_DCINOVP, PMIC_INT3, 1 << 2),
DECLARE_IRQ(MAX8997_PMICIRQ_TOPOFFR, PMIC_INT3, 1 << 3),
DECLARE_IRQ(MAX8997_PMICIRQ_CHGRSTF, PMIC_INT3, 1 << 5),
DECLARE_IRQ(MAX8997_PMICIRQ_MBCHGTMEXPD, PMIC_INT3, 1 << 7),
DECLARE_IRQ(MAX8997_PMICIRQ_RTC60S, PMIC_INT4, 1 << 0),
DECLARE_IRQ(MAX8997_PMICIRQ_RTCA1, PMIC_INT4, 1 << 1),
DECLARE_IRQ(MAX8997_PMICIRQ_RTCA2, PMIC_INT4, 1 << 2),
DECLARE_IRQ(MAX8997_PMICIRQ_SMPL_INT, PMIC_INT4, 1 << 3),
DECLARE_IRQ(MAX8997_PMICIRQ_RTC1S, PMIC_INT4, 1 << 4),
DECLARE_IRQ(MAX8997_PMICIRQ_WTSR, PMIC_INT4, 1 << 5),
DECLARE_IRQ(MAX8997_MUICIRQ_ADCError, MUIC_INT1, 1 << 2),
DECLARE_IRQ(MAX8997_MUICIRQ_ADCLow, MUIC_INT1, 1 << 1),
DECLARE_IRQ(MAX8997_MUICIRQ_ADC, MUIC_INT1, 1 << 0),
DECLARE_IRQ(MAX8997_MUICIRQ_VBVolt, MUIC_INT2, 1 << 4),
DECLARE_IRQ(MAX8997_MUICIRQ_DBChg, MUIC_INT2, 1 << 3),
DECLARE_IRQ(MAX8997_MUICIRQ_DCDTmr, MUIC_INT2, 1 << 2),
DECLARE_IRQ(MAX8997_MUICIRQ_ChgDetRun, MUIC_INT2, 1 << 1),
DECLARE_IRQ(MAX8997_MUICIRQ_ChgTyp, MUIC_INT2, 1 << 0),
DECLARE_IRQ(MAX8997_MUICIRQ_OVP, MUIC_INT3, 1 << 2),
};
static void max8997_irq_lock(struct irq_data *data)
{
struct max8997_dev *max8997 = irq_get_chip_data(data->irq);
mutex_lock(&max8997->irqlock);
}
static void max8997_irq_sync_unlock(struct irq_data *data)
{
struct max8997_dev *max8997 = irq_get_chip_data(data->irq);
int i;
for (i = 0; i < MAX8997_IRQ_GROUP_NR; i++) {
u8 mask_reg = max8997_mask_reg[i];
struct i2c_client *i2c = get_i2c(max8997, i);
if (mask_reg == MAX8997_REG_INVALID ||
IS_ERR_OR_NULL(i2c))
continue;
max8997->irq_masks_cache[i] = max8997->irq_masks_cur[i];
max8997_write_reg(i2c, max8997_mask_reg[i],
max8997->irq_masks_cur[i]);
}
mutex_unlock(&max8997->irqlock);
}
static const inline struct max8997_irq_data *
irq_to_max8997_irq(struct max8997_dev *max8997, int irq)
{
return &max8997_irqs[irq - max8997->irq_base];
}
static void max8997_irq_mask(struct irq_data *data)
{
struct max8997_dev *max8997 = irq_get_chip_data(data->irq);
const struct max8997_irq_data *irq_data = irq_to_max8997_irq(max8997,
data->irq);
max8997->irq_masks_cur[irq_data->group] |= irq_data->mask;
}
static void max8997_irq_unmask(struct irq_data *data)
{
struct max8997_dev *max8997 = irq_get_chip_data(data->irq);
const struct max8997_irq_data *irq_data = irq_to_max8997_irq(max8997,
data->irq);
max8997->irq_masks_cur[irq_data->group] &= ~irq_data->mask;
}
static struct irq_chip max8997_irq_chip = {
.name = "max8997",
.irq_bus_lock = max8997_irq_lock,
.irq_bus_sync_unlock = max8997_irq_sync_unlock,
.irq_mask = max8997_irq_mask,
.irq_unmask = max8997_irq_unmask,
};
#define MAX8997_IRQSRC_PMIC (1 << 1)
#define MAX8997_IRQSRC_FUELGAUGE (1 << 2)
#define MAX8997_IRQSRC_MUIC (1 << 3)
#define MAX8997_IRQSRC_GPIO (1 << 4)
#define MAX8997_IRQSRC_FLASH (1 << 5)
static irqreturn_t max8997_irq_thread(int irq, void *data)
{
struct max8997_dev *max8997 = data;
u8 irq_reg[MAX8997_IRQ_GROUP_NR] = {};
u8 irq_src;
int ret;
int i;
ret = max8997_read_reg(max8997->i2c, MAX8997_REG_INTSRC, &irq_src);
if (ret < 0) {
dev_err(max8997->dev, "Failed to read interrupt source: %d\n",
ret);
return IRQ_NONE;
}
if (irq_src & MAX8997_IRQSRC_PMIC) {
/* PMIC INT1 ~ INT4 */
max8997_bulk_read(max8997->i2c, MAX8997_REG_INT1, 4,
&irq_reg[PMIC_INT1]);
}
if (irq_src & MAX8997_IRQSRC_FUELGAUGE) {
/*
* TODO: FUEL GAUGE
*
* This is to be supported by Max17042 driver. When
* an interrupt incurs here, it should be relayed to a
* Max17042 device that is connected (probably by
* platform-data). However, we do not have interrupt
* handling in Max17042 driver currently. The Max17042 IRQ
* driver should be ready to be used as a stand-alone device and
* a Max8997-dependent device. Because it is not ready in
* Max17042-side and it is not too critical in operating
* Max8997, we do not implement this in initial releases.
*/
irq_reg[FUEL_GAUGE] = 0;
}
if (irq_src & MAX8997_IRQSRC_MUIC) {
/* MUIC INT1 ~ INT3 */
max8997_bulk_read(max8997->muic, MAX8997_MUIC_REG_INT1, 3,
&irq_reg[MUIC_INT1]);
}
if (irq_src & MAX8997_IRQSRC_GPIO) {
/* GPIO Interrupt */
u8 gpio_info[MAX8997_NUM_GPIO];
irq_reg[GPIO_LOW] = 0;
irq_reg[GPIO_HI] = 0;
max8997_bulk_read(max8997->i2c, MAX8997_REG_GPIOCNTL1,
MAX8997_NUM_GPIO, gpio_info);
for (i = 0; i < MAX8997_NUM_GPIO; i++) {
bool interrupt = false;
switch (gpio_info[i] & MAX8997_GPIO_INT_MASK) {
case MAX8997_GPIO_INT_BOTH:
if (max8997->gpio_status[i] != gpio_info[i])
interrupt = true;
break;
case MAX8997_GPIO_INT_RISE:
if ((max8997->gpio_status[i] != gpio_info[i]) &&
(gpio_info[i] & MAX8997_GPIO_DATA_MASK))
interrupt = true;
break;
case MAX8997_GPIO_INT_FALL:
if ((max8997->gpio_status[i] != gpio_info[i]) &&
!(gpio_info[i] & MAX8997_GPIO_DATA_MASK))
interrupt = true;
break;
default:
break;
}
if (interrupt) {
if (i < 8)
irq_reg[GPIO_LOW] |= (1 << i);
else
irq_reg[GPIO_HI] |= (1 << (i - 8));
}
}
}
if (irq_src & MAX8997_IRQSRC_FLASH) {
/* Flash Status Interrupt */
ret = max8997_read_reg(max8997->i2c, MAX8997_REG_FLASHSTATUS,
&irq_reg[FLASH_STATUS]);
}
/* Apply masking */
for (i = 0; i < MAX8997_IRQ_GROUP_NR; i++)
irq_reg[i] &= ~max8997->irq_masks_cur[i];
/* Report */
for (i = 0; i < MAX8997_IRQ_NR; i++) {
if (irq_reg[max8997_irqs[i].group] & max8997_irqs[i].mask)
handle_nested_irq(max8997->irq_base + i);
}
return IRQ_HANDLED;
}
int max8997_irq_resume(struct max8997_dev *max8997)
{
if (max8997->irq && max8997->irq_base)
max8997_irq_thread(max8997->irq_base, max8997);
return 0;
}
int max8997_irq_init(struct max8997_dev *max8997)
{
int i;
int cur_irq;
int ret;
u8 val;
if (!max8997->irq) {
dev_warn(max8997->dev, "No interrupt specified.\n");
max8997->irq_base = 0;
return 0;
}
if (!max8997->irq_base) {
dev_err(max8997->dev, "No interrupt base specified.\n");
return 0;
}
mutex_init(&max8997->irqlock);
/* Mask individual interrupt sources */
for (i = 0; i < MAX8997_IRQ_GROUP_NR; i++) {
struct i2c_client *i2c;
max8997->irq_masks_cur[i] = 0xff;
max8997->irq_masks_cache[i] = 0xff;
i2c = get_i2c(max8997, i);
if (IS_ERR_OR_NULL(i2c))
continue;
if (max8997_mask_reg[i] == MAX8997_REG_INVALID)
continue;
max8997_write_reg(i2c, max8997_mask_reg[i], 0xff);
}
for (i = 0; i < MAX8997_NUM_GPIO; i++) {
max8997->gpio_status[i] = (max8997_read_reg(max8997->i2c,
MAX8997_REG_GPIOCNTL1 + i,
&val)
& MAX8997_GPIO_DATA_MASK) ?
true : false;
}
/* Register with genirq */
for (i = 0; i < MAX8997_IRQ_NR; i++) {
cur_irq = i + max8997->irq_base;
irq_set_chip_data(cur_irq, max8997);
irq_set_chip_and_handler(cur_irq, &max8997_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(max8997->irq, NULL, max8997_irq_thread,
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
"max8997-irq", max8997);
if (ret) {
dev_err(max8997->dev, "Failed to request IRQ %d: %d\n",
max8997->irq, ret);
return ret;
}
if (!max8997->ono)
return 0;
ret = request_threaded_irq(max8997->ono, NULL, max8997_irq_thread,
IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
IRQF_ONESHOT, "max8997-ono", max8997);
if (ret)
dev_err(max8997->dev, "Failed to request ono-IRQ %d: %d\n",
max8997->ono, ret);
return 0;
}
void max8997_irq_exit(struct max8997_dev *max8997)
{
if (max8997->ono)
free_irq(max8997->ono, max8997);
if (max8997->irq)
free_irq(max8997->irq, max8997);
}