ANDROID GPIO 中断程序

/* * ADXL345/346 Three-Axis Digital Accelerometers * * Enter bugs at http://blackfin.uclinux.org/ * * Copyright (C) 2009 Michael Hennerich, Analog Devices Inc. * Licensed under the GPL-2 or later. */ #include <linux/device.h> #include <linux/init.h> #include <linux/delay.h> #include <mach/gpio.h> #include <linux/input.h> #include <linux/interrupt.h> #include <linux/irq.h> #include <linux/slab.h> #include <linux/workqueue.h> #include <linux/uaccess.h> #include <linux/poll.h> #include <linux/miscdevice.h> #include <linux/wait.h> #include <linux/sched.h> #define GPS_VERSION "1.00" #define GPS_IRQ_NUM 103 struct gps_irq { wait_queue_head_t wait; int irq; int host_req_pin; }; irqreturn_t gps_irq_handler(int irq, void *dev_id) { struct gps_irq* ac_data = dev_id; wake_up_interruptible(&ac_data->wait); return IRQ_HANDLED; } static int gps_irq_open(struct inode *inode, struct file *filp) { int ret; int irq; struct gps_irq* ac_data = kzalloc(sizeof(struct gps_irq), GFP_KERNEL); filp->private_data = ac_data; init_waitqueue_head(&ac_data->wait); /* * Allocate the IRQ */ gpio_request(GPS_IRQ_NUM, "gps_irq"); gpio_direction_input(GPS_IRQ_NUM); irq = sprd_alloc_gpio_irq(GPS_IRQ_NUM); if (irq < 0) { printk("sprd_alloc_gpio_irq failed!\n"); return -1; } ac_data->irq = irq; ac_data->host_req_pin = GPS_IRQ_NUM; ret = request_irq(irq, gps_irq_handler, IRQF_TRIGGER_RISING, "gps_interrupt", ac_data); if (ret) { printk("sprd request irq failed!\n"); } return ret; } static int gps_irq_release(struct inode *inode, struct file *filp) { struct gps_irq *ac_data = filp->private_data; /* * Free the interrupt */ free_irq(ac_data->irq, ac_data); sprd_free_gpio_irq(ac_data->irq); kfree(ac_data); filp->private_data = NULL; return 0; } static unsigned int gps_irq_poll(struct file *filp, poll_table *wait) { struct gps_irq *ac_data = filp->private_data; poll_wait(filp, &ac_data->wait, wait); if ( gpio_get_value(ac_data->host_req_pin) ) { return POLLIN | POLLRDNORM; } return 0; } static const struct file_operations gps_irq_fops = { .open = gps_irq_open, .release = gps_irq_release, .poll = gps_irq_poll, }; static struct miscdevice gps_irq_dev = { .minor = MISC_DYNAMIC_MINOR, .name = "gps_irq", .fops = &gps_irq_fops }; static int gps_irq_init(void) { printk(KERN_INFO "Generic GPS IRQ Driver v%s\n", GPS_VERSION); return misc_register(&gps_irq_dev); } static void gps_irq_exit(void) { misc_deregister(&gps_irq_dev); } module_init(gps_irq_init); module_exit(gps_irq_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("yangzicheng <yangzicheng@huawei.com>"); MODULE_DESCRIPTION("Driver for gps interrupt");