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48 lines
961 B
48 lines
961 B
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) 2002 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com) |
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*/ |
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#include <linux/interrupt.h> |
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#include <irq_kern.h> |
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#include <os.h> |
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#include <sigio.h> |
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/* Protected by sigio_lock() called from write_sigio_workaround */ |
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static int sigio_irq_fd = -1; |
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static irqreturn_t sigio_interrupt(int irq, void *data) |
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{ |
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char c; |
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os_read_file(sigio_irq_fd, &c, sizeof(c)); |
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return IRQ_HANDLED; |
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} |
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int write_sigio_irq(int fd) |
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{ |
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int err; |
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err = um_request_irq(SIGIO_WRITE_IRQ, fd, IRQ_READ, sigio_interrupt, |
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0, "write sigio", NULL); |
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if (err < 0) { |
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printk(KERN_ERR "write_sigio_irq : um_request_irq failed, " |
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"err = %d\n", err); |
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return -1; |
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} |
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sigio_irq_fd = fd; |
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return 0; |
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} |
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/* These are called from os-Linux/sigio.c to protect its pollfds arrays. */ |
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static DEFINE_MUTEX(sigio_mutex); |
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void sigio_lock(void) |
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{ |
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mutex_lock(&sigio_mutex); |
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} |
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void sigio_unlock(void) |
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{ |
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mutex_unlock(&sigio_mutex); |
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}
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