// SPDX-License-Identifier: GPL-2.0+
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//
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// Interrupt controller support for MAX8998
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//
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// Copyright (C) 2010 Samsung Electronics Co.Ltd
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// Author: Joonyoung Shim <jy0922.shim@samsung.com>
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#include <linux/device.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/irqdomain.h>
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#include <linux/mfd/max8998-private.h>
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struct max8998_irq_data {
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int reg;
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int mask;
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};
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static struct max8998_irq_data max8998_irqs[] = {
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[MAX8998_IRQ_DCINF] = {
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.reg = 1,
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.mask = MAX8998_IRQ_DCINF_MASK,
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},
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[MAX8998_IRQ_DCINR] = {
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.reg = 1,
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.mask = MAX8998_IRQ_DCINR_MASK,
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},
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[MAX8998_IRQ_JIGF] = {
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.reg = 1,
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.mask = MAX8998_IRQ_JIGF_MASK,
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},
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[MAX8998_IRQ_JIGR] = {
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.reg = 1,
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.mask = MAX8998_IRQ_JIGR_MASK,
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},
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[MAX8998_IRQ_PWRONF] = {
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.reg = 1,
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.mask = MAX8998_IRQ_PWRONF_MASK,
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},
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[MAX8998_IRQ_PWRONR] = {
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.reg = 1,
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.mask = MAX8998_IRQ_PWRONR_MASK,
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},
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[MAX8998_IRQ_WTSREVNT] = {
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.reg = 2,
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.mask = MAX8998_IRQ_WTSREVNT_MASK,
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},
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[MAX8998_IRQ_SMPLEVNT] = {
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.reg = 2,
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.mask = MAX8998_IRQ_SMPLEVNT_MASK,
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},
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[MAX8998_IRQ_ALARM1] = {
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.reg = 2,
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.mask = MAX8998_IRQ_ALARM1_MASK,
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},
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[MAX8998_IRQ_ALARM0] = {
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.reg = 2,
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.mask = MAX8998_IRQ_ALARM0_MASK,
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},
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[MAX8998_IRQ_ONKEY1S] = {
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.reg = 3,
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.mask = MAX8998_IRQ_ONKEY1S_MASK,
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},
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[MAX8998_IRQ_TOPOFFR] = {
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.reg = 3,
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.mask = MAX8998_IRQ_TOPOFFR_MASK,
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},
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[MAX8998_IRQ_DCINOVPR] = {
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.reg = 3,
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.mask = MAX8998_IRQ_DCINOVPR_MASK,
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},
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[MAX8998_IRQ_CHGRSTF] = {
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.reg = 3,
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.mask = MAX8998_IRQ_CHGRSTF_MASK,
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},
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[MAX8998_IRQ_DONER] = {
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.reg = 3,
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.mask = MAX8998_IRQ_DONER_MASK,
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},
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[MAX8998_IRQ_CHGFAULT] = {
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.reg = 3,
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.mask = MAX8998_IRQ_CHGFAULT_MASK,
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},
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[MAX8998_IRQ_LOBAT1] = {
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.reg = 4,
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.mask = MAX8998_IRQ_LOBAT1_MASK,
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},
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[MAX8998_IRQ_LOBAT2] = {
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.reg = 4,
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.mask = MAX8998_IRQ_LOBAT2_MASK,
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},
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};
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static inline struct max8998_irq_data *
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irq_to_max8998_irq(struct max8998_dev *max8998, struct irq_data *data)
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{
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return &max8998_irqs[data->hwirq];
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}
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static void max8998_irq_lock(struct irq_data *data)
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{
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struct max8998_dev *max8998 = irq_data_get_irq_chip_data(data);
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mutex_lock(&max8998->irqlock);
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}
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static void max8998_irq_sync_unlock(struct irq_data *data)
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{
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struct max8998_dev *max8998 = irq_data_get_irq_chip_data(data);
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int i;
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for (i = 0; i < ARRAY_SIZE(max8998->irq_masks_cur); i++) {
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/*
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* If there's been a change in the mask write it back
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* to the hardware.
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*/
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if (max8998->irq_masks_cur[i] != max8998->irq_masks_cache[i]) {
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max8998->irq_masks_cache[i] = max8998->irq_masks_cur[i];
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max8998_write_reg(max8998->i2c, MAX8998_REG_IRQM1 + i,
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max8998->irq_masks_cur[i]);
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}
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}
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mutex_unlock(&max8998->irqlock);
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}
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static void max8998_irq_unmask(struct irq_data *data)
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{
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struct max8998_dev *max8998 = irq_data_get_irq_chip_data(data);
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struct max8998_irq_data *irq_data = irq_to_max8998_irq(max8998, data);
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max8998->irq_masks_cur[irq_data->reg - 1] &= ~irq_data->mask;
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}
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static void max8998_irq_mask(struct irq_data *data)
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{
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struct max8998_dev *max8998 = irq_data_get_irq_chip_data(data);
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struct max8998_irq_data *irq_data = irq_to_max8998_irq(max8998, data);
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max8998->irq_masks_cur[irq_data->reg - 1] |= irq_data->mask;
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}
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static struct irq_chip max8998_irq_chip = {
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.name = "max8998",
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.irq_bus_lock = max8998_irq_lock,
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.irq_bus_sync_unlock = max8998_irq_sync_unlock,
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.irq_mask = max8998_irq_mask,
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.irq_unmask = max8998_irq_unmask,
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};
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static irqreturn_t max8998_irq_thread(int irq, void *data)
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{
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struct max8998_dev *max8998 = data;
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u8 irq_reg[MAX8998_NUM_IRQ_REGS];
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int ret;
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int i;
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ret = max8998_bulk_read(max8998->i2c, MAX8998_REG_IRQ1,
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MAX8998_NUM_IRQ_REGS, irq_reg);
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if (ret < 0) {
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dev_err(max8998->dev, "Failed to read interrupt register: %d\n",
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ret);
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return IRQ_NONE;
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}
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/* Apply masking */
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for (i = 0; i < MAX8998_NUM_IRQ_REGS; i++)
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irq_reg[i] &= ~max8998->irq_masks_cur[i];
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/* Report */
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for (i = 0; i < MAX8998_IRQ_NR; i++) {
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if (irq_reg[max8998_irqs[i].reg - 1] & max8998_irqs[i].mask) {
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irq = irq_find_mapping(max8998->irq_domain, i);
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if (WARN_ON(!irq)) {
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disable_irq_nosync(max8998->irq);
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return IRQ_NONE;
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}
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handle_nested_irq(irq);
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}
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}
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return IRQ_HANDLED;
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}
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int max8998_irq_resume(struct max8998_dev *max8998)
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{
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if (max8998->irq && max8998->irq_domain)
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max8998_irq_thread(max8998->irq, max8998);
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return 0;
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}
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static int max8998_irq_domain_map(struct irq_domain *d, unsigned int irq,
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irq_hw_number_t hw)
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{
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struct max8997_dev *max8998 = d->host_data;
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irq_set_chip_data(irq, max8998);
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irq_set_chip_and_handler(irq, &max8998_irq_chip, handle_edge_irq);
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irq_set_nested_thread(irq, 1);
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irq_set_noprobe(irq);
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return 0;
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}
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static const struct irq_domain_ops max8998_irq_domain_ops = {
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.map = max8998_irq_domain_map,
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};
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int max8998_irq_init(struct max8998_dev *max8998)
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{
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int i;
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int ret;
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struct irq_domain *domain;
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if (!max8998->irq) {
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dev_warn(max8998->dev,
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"No interrupt specified, no interrupts\n");
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return 0;
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}
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mutex_init(&max8998->irqlock);
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/* Mask the individual interrupt sources */
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for (i = 0; i < MAX8998_NUM_IRQ_REGS; i++) {
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max8998->irq_masks_cur[i] = 0xff;
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max8998->irq_masks_cache[i] = 0xff;
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max8998_write_reg(max8998->i2c, MAX8998_REG_IRQM1 + i, 0xff);
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}
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max8998_write_reg(max8998->i2c, MAX8998_REG_STATUSM1, 0xff);
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max8998_write_reg(max8998->i2c, MAX8998_REG_STATUSM2, 0xff);
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domain = irq_domain_add_simple(NULL, MAX8998_IRQ_NR,
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max8998->irq_base, &max8998_irq_domain_ops, max8998);
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if (!domain) {
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dev_err(max8998->dev, "could not create irq domain\n");
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return -ENODEV;
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}
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max8998->irq_domain = domain;
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ret = request_threaded_irq(max8998->irq, NULL, max8998_irq_thread,
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
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"max8998-irq", max8998);
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if (ret) {
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dev_err(max8998->dev, "Failed to request IRQ %d: %d\n",
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max8998->irq, ret);
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return ret;
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}
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if (!max8998->ono)
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return 0;
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ret = request_threaded_irq(max8998->ono, NULL, max8998_irq_thread,
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IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
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IRQF_ONESHOT, "max8998-ono", max8998);
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if (ret)
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dev_err(max8998->dev, "Failed to request IRQ %d: %d\n",
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max8998->ono, ret);
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return 0;
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}
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void max8998_irq_exit(struct max8998_dev *max8998)
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{
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if (max8998->ono)
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free_irq(max8998->ono, max8998);
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if (max8998->irq)
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free_irq(max8998->irq, max8998);
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}
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