196 lines
4.4 KiB
C
196 lines
4.4 KiB
C
/*
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* TI LP8788 MFD - interrupt handler
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*
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* Copyright 2012 Texas Instruments
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*
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* Author: Milo(Woogyom) Kim <milo.kim@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/delay.h>
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#include <linux/err.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/device.h>
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#include <linux/mfd/lp8788.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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/* register address */
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#define LP8788_INT_1 0x00
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#define LP8788_INTEN_1 0x03
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#define BASE_INTEN_ADDR LP8788_INTEN_1
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#define SIZE_REG 8
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#define NUM_REGS 3
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/*
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* struct lp8788_irq_data
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* @lp : used for accessing to lp8788 registers
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* @irq_lock : mutex for enabling/disabling the interrupt
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* @domain : IRQ domain for handling nested interrupt
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* @enabled : status of enabled interrupt
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*/
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struct lp8788_irq_data {
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struct lp8788 *lp;
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struct mutex irq_lock;
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struct irq_domain *domain;
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int enabled[LP8788_INT_MAX];
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};
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static inline u8 _irq_to_addr(enum lp8788_int_id id)
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{
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return id / SIZE_REG;
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}
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static inline u8 _irq_to_enable_addr(enum lp8788_int_id id)
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{
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return _irq_to_addr(id) + BASE_INTEN_ADDR;
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}
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static inline u8 _irq_to_mask(enum lp8788_int_id id)
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{
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return 1 << (id % SIZE_REG);
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}
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static inline u8 _irq_to_val(enum lp8788_int_id id, int enable)
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{
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return enable << (id % SIZE_REG);
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}
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static void lp8788_irq_enable(struct irq_data *data)
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{
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struct lp8788_irq_data *irqd = irq_data_get_irq_chip_data(data);
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irqd->enabled[data->hwirq] = 1;
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}
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static void lp8788_irq_disable(struct irq_data *data)
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{
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struct lp8788_irq_data *irqd = irq_data_get_irq_chip_data(data);
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irqd->enabled[data->hwirq] = 0;
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}
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static void lp8788_irq_bus_lock(struct irq_data *data)
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{
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struct lp8788_irq_data *irqd = irq_data_get_irq_chip_data(data);
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mutex_lock(&irqd->irq_lock);
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}
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static void lp8788_irq_bus_sync_unlock(struct irq_data *data)
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{
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struct lp8788_irq_data *irqd = irq_data_get_irq_chip_data(data);
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enum lp8788_int_id irq = data->hwirq;
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u8 addr, mask, val;
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addr = _irq_to_enable_addr(irq);
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mask = _irq_to_mask(irq);
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val = _irq_to_val(irq, irqd->enabled[irq]);
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lp8788_update_bits(irqd->lp, addr, mask, val);
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mutex_unlock(&irqd->irq_lock);
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}
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static struct irq_chip lp8788_irq_chip = {
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.name = "lp8788",
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.irq_enable = lp8788_irq_enable,
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.irq_disable = lp8788_irq_disable,
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.irq_bus_lock = lp8788_irq_bus_lock,
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.irq_bus_sync_unlock = lp8788_irq_bus_sync_unlock,
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};
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static irqreturn_t lp8788_irq_handler(int irq, void *ptr)
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{
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struct lp8788_irq_data *irqd = ptr;
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struct lp8788 *lp = irqd->lp;
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u8 status[NUM_REGS], addr, mask;
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bool handled = false;
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int i;
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if (lp8788_read_multi_bytes(lp, LP8788_INT_1, status, NUM_REGS))
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return IRQ_NONE;
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for (i = 0 ; i < LP8788_INT_MAX ; i++) {
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addr = _irq_to_addr(i);
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mask = _irq_to_mask(i);
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/* reporting only if the irq is enabled */
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if (status[addr] & mask) {
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handle_nested_irq(irq_find_mapping(irqd->domain, i));
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handled = true;
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}
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}
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return handled ? IRQ_HANDLED : IRQ_NONE;
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}
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static int lp8788_irq_map(struct irq_domain *d, unsigned int virq,
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irq_hw_number_t hwirq)
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{
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struct lp8788_irq_data *irqd = d->host_data;
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struct irq_chip *chip = &lp8788_irq_chip;
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irq_set_chip_data(virq, irqd);
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irq_set_chip_and_handler(virq, chip, handle_edge_irq);
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irq_set_nested_thread(virq, 1);
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irq_set_noprobe(virq);
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return 0;
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}
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static const struct irq_domain_ops lp8788_domain_ops = {
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.map = lp8788_irq_map,
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};
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int lp8788_irq_init(struct lp8788 *lp, int irq)
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{
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struct lp8788_irq_data *irqd;
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int ret;
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if (irq <= 0) {
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dev_warn(lp->dev, "invalid irq number: %d\n", irq);
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return 0;
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}
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irqd = devm_kzalloc(lp->dev, sizeof(*irqd), GFP_KERNEL);
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if (!irqd)
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return -ENOMEM;
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irqd->lp = lp;
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irqd->domain = irq_domain_add_linear(lp->dev->of_node, LP8788_INT_MAX,
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&lp8788_domain_ops, irqd);
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if (!irqd->domain) {
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dev_err(lp->dev, "failed to add irq domain err\n");
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return -EINVAL;
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}
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lp->irqdm = irqd->domain;
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mutex_init(&irqd->irq_lock);
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ret = request_threaded_irq(irq, NULL, lp8788_irq_handler,
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
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"lp8788-irq", irqd);
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if (ret) {
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dev_err(lp->dev, "failed to create a thread for IRQ_N\n");
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return ret;
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}
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lp->irq = irq;
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return 0;
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}
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void lp8788_irq_exit(struct lp8788 *lp)
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{
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if (lp->irq)
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free_irq(lp->irq, lp->irqdm);
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}
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