linux-imx
Public
Source
committed ce7ff1cffdax
/* * dell-smo8800.c - Dell Latitude ACPI SMO88XX freefall sensor driver * * Copyright (C) 2012 Sonal Santan <sonal.santan@gmail.com> * Copyright (C) 2014 Pali Rohár <pali.rohar@gmail.com> * * This is loosely based on lis3lv02d driver. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */struct smo8800_device { u32 irq; /* acpi device irq */ atomic_t counter; /* count after last read */ struct miscdevice miscdev; /* for /dev/freefall */ unsigned long misc_opened; /* whether the device is open */ wait_queue_head_t misc_wait; /* Wait queue for the misc dev */ struct device *dev; /* acpi device */};static irqreturn_t smo8800_interrupt_quick(int irq, void *data){ struct smo8800_device *smo8800 = data; atomic_inc(&smo8800->counter); wake_up_interruptible(&smo8800->misc_wait); return IRQ_WAKE_THREAD;}static irqreturn_t smo8800_interrupt_thread(int irq, void *data){ struct smo8800_device *smo8800 = data; dev_info(smo8800->dev, "detected free fall\n"); return IRQ_HANDLED;}static acpi_status smo8800_get_resource(struct acpi_resource *resource, void *context){ struct acpi_resource_extended_irq *irq; if (resource->type != ACPI_RESOURCE_TYPE_EXTENDED_IRQ) return AE_OK; irq = &resource->data.extended_irq; if (!irq || !irq->interrupt_count) return AE_OK; *((u32 *)context) = irq->interrupts[0]; return AE_CTRL_TERMINATE;}static u32 smo8800_get_irq(struct acpi_device *device){ u32 irq = 0; acpi_status status; status = acpi_walk_resources(device->handle, METHOD_NAME__CRS, smo8800_get_resource, &irq); if (ACPI_FAILURE(status)) { dev_err(&device->dev, "acpi_walk_resources failed\n"); return 0; } return irq;}static ssize_t smo8800_misc_read(struct file *file, char __user *buf, size_t count, loff_t *pos){ struct smo8800_device *smo8800 = container_of(file->private_data, struct smo8800_device, miscdev); u32 data = 0;