/* * 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); }