165 строки
4.1 KiB
C
165 строки
4.1 KiB
C
/*
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* Copyright (C) 2017 Bartosz Golaszewski <brgl@bgdev.pl>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/irq_sim.h>
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#include <linux/irq.h>
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struct irq_sim_devres {
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struct irq_sim *sim;
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};
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static void irq_sim_irqmask(struct irq_data *data)
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{
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struct irq_sim_irq_ctx *irq_ctx = irq_data_get_irq_chip_data(data);
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irq_ctx->enabled = false;
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}
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static void irq_sim_irqunmask(struct irq_data *data)
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{
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struct irq_sim_irq_ctx *irq_ctx = irq_data_get_irq_chip_data(data);
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irq_ctx->enabled = true;
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}
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static struct irq_chip irq_sim_irqchip = {
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.name = "irq_sim",
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.irq_mask = irq_sim_irqmask,
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.irq_unmask = irq_sim_irqunmask,
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};
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static void irq_sim_handle_irq(struct irq_work *work)
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{
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struct irq_sim_work_ctx *work_ctx;
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work_ctx = container_of(work, struct irq_sim_work_ctx, work);
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handle_simple_irq(irq_to_desc(work_ctx->irq));
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}
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/**
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* irq_sim_init - Initialize the interrupt simulator: allocate a range of
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* dummy interrupts.
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*
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* @sim: The interrupt simulator object to initialize.
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* @num_irqs: Number of interrupts to allocate
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*
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* Returns 0 on success and a negative error number on failure.
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*/
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int irq_sim_init(struct irq_sim *sim, unsigned int num_irqs)
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{
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int i;
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sim->irqs = kmalloc_array(num_irqs, sizeof(*sim->irqs), GFP_KERNEL);
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if (!sim->irqs)
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return -ENOMEM;
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sim->irq_base = irq_alloc_descs(-1, 0, num_irqs, 0);
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if (sim->irq_base < 0) {
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kfree(sim->irqs);
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return sim->irq_base;
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}
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for (i = 0; i < num_irqs; i++) {
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sim->irqs[i].irqnum = sim->irq_base + i;
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sim->irqs[i].enabled = false;
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irq_set_chip(sim->irq_base + i, &irq_sim_irqchip);
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irq_set_chip_data(sim->irq_base + i, &sim->irqs[i]);
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irq_set_handler(sim->irq_base + i, &handle_simple_irq);
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irq_modify_status(sim->irq_base + i,
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IRQ_NOREQUEST | IRQ_NOAUTOEN, IRQ_NOPROBE);
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}
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init_irq_work(&sim->work_ctx.work, irq_sim_handle_irq);
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sim->irq_count = num_irqs;
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return 0;
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}
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EXPORT_SYMBOL_GPL(irq_sim_init);
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/**
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* irq_sim_fini - Deinitialize the interrupt simulator: free the interrupt
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* descriptors and allocated memory.
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*
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* @sim: The interrupt simulator to tear down.
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*/
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void irq_sim_fini(struct irq_sim *sim)
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{
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irq_work_sync(&sim->work_ctx.work);
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irq_free_descs(sim->irq_base, sim->irq_count);
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kfree(sim->irqs);
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}
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EXPORT_SYMBOL_GPL(irq_sim_fini);
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static void devm_irq_sim_release(struct device *dev, void *res)
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{
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struct irq_sim_devres *this = res;
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irq_sim_fini(this->sim);
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}
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/**
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* irq_sim_init - Initialize the interrupt simulator for a managed device.
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*
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* @dev: Device to initialize the simulator object for.
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* @sim: The interrupt simulator object to initialize.
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* @num_irqs: Number of interrupts to allocate
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*
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* Returns 0 on success and a negative error number on failure.
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*/
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int devm_irq_sim_init(struct device *dev, struct irq_sim *sim,
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unsigned int num_irqs)
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{
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struct irq_sim_devres *dr;
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int rv;
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dr = devres_alloc(devm_irq_sim_release, sizeof(*dr), GFP_KERNEL);
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if (!dr)
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return -ENOMEM;
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rv = irq_sim_init(sim, num_irqs);
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if (rv) {
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devres_free(dr);
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return rv;
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}
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dr->sim = sim;
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devres_add(dev, dr);
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return 0;
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}
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EXPORT_SYMBOL_GPL(devm_irq_sim_init);
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/**
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* irq_sim_fire - Enqueue an interrupt.
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*
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* @sim: The interrupt simulator object.
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* @offset: Offset of the simulated interrupt which should be fired.
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*/
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void irq_sim_fire(struct irq_sim *sim, unsigned int offset)
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{
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if (sim->irqs[offset].enabled) {
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sim->work_ctx.irq = irq_sim_irqnum(sim, offset);
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irq_work_queue(&sim->work_ctx.work);
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}
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}
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EXPORT_SYMBOL_GPL(irq_sim_fire);
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/**
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* irq_sim_irqnum - Get the allocated number of a dummy interrupt.
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*
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* @sim: The interrupt simulator object.
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* @offset: Offset of the simulated interrupt for which to retrieve
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* the number.
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*/
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int irq_sim_irqnum(struct irq_sim *sim, unsigned int offset)
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{
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return sim->irqs[offset].irqnum;
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}
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EXPORT_SYMBOL_GPL(irq_sim_irqnum);
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