From 03dd4cb26d967f9588437b0fc9cc0e8353322bb7 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Fri, 25 Mar 2016 03:53:42 -0300 Subject: Linux-libre 4.5-gnu --- drivers/staging/iio/iio_dummy_evgen.c | 262 ---------------------------------- 1 file changed, 262 deletions(-) delete mode 100644 drivers/staging/iio/iio_dummy_evgen.c (limited to 'drivers/staging/iio/iio_dummy_evgen.c') diff --git a/drivers/staging/iio/iio_dummy_evgen.c b/drivers/staging/iio/iio_dummy_evgen.c deleted file mode 100644 index 9e83f348d..000000000 --- a/drivers/staging/iio/iio_dummy_evgen.c +++ /dev/null @@ -1,262 +0,0 @@ -/** - * Copyright (c) 2011 Jonathan Cameron - * - * 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. - * - * Companion module to the iio simple dummy example driver. - * The purpose of this is to generate 'fake' event interrupts thus - * allowing that driver's code to be as close as possible to that of - * a normal driver talking to hardware. The approach used here - * is not intended to be general and just happens to work for this - * particular use case. - */ - -#include -#include -#include -#include -#include -#include -#include - -#include "iio_dummy_evgen.h" -#include -#include -#include - -/* Fiddly bit of faking and irq without hardware */ -#define IIO_EVENTGEN_NO 10 - -/** - * struct iio_dummy_handle_irq - helper struct to simulate interrupt generation - * @work: irq_work used to run handlers from hardirq context - * @irq: fake irq line number to trigger an interrupt - */ -struct iio_dummy_handle_irq { - struct irq_work work; - int irq; -}; - -/** - * struct iio_dummy_evgen - evgen state - * @chip: irq chip we are faking - * @base: base of irq range - * @enabled: mask of which irqs are enabled - * @inuse: mask of which irqs are connected - * @regs: irq regs we are faking - * @lock: protect the evgen state - * @handler: helper for a 'hardware-like' interrupt simulation - */ -struct iio_dummy_eventgen { - struct irq_chip chip; - int base; - bool enabled[IIO_EVENTGEN_NO]; - bool inuse[IIO_EVENTGEN_NO]; - struct iio_dummy_regs regs[IIO_EVENTGEN_NO]; - struct mutex lock; - struct iio_dummy_handle_irq handler; -}; - -/* We can only ever have one instance of this 'device' */ -static struct iio_dummy_eventgen *iio_evgen; -static const char *iio_evgen_name = "iio_dummy_evgen"; - -static void iio_dummy_event_irqmask(struct irq_data *d) -{ - struct irq_chip *chip = irq_data_get_irq_chip(d); - struct iio_dummy_eventgen *evgen = - container_of(chip, struct iio_dummy_eventgen, chip); - - evgen->enabled[d->irq - evgen->base] = false; -} - -static void iio_dummy_event_irqunmask(struct irq_data *d) -{ - struct irq_chip *chip = irq_data_get_irq_chip(d); - struct iio_dummy_eventgen *evgen = - container_of(chip, struct iio_dummy_eventgen, chip); - - evgen->enabled[d->irq - evgen->base] = true; -} - -static void iio_dummy_work_handler(struct irq_work *work) -{ - struct iio_dummy_handle_irq *irq_handler; - - irq_handler = container_of(work, struct iio_dummy_handle_irq, work); - handle_simple_irq(irq_to_desc(irq_handler->irq)); -} - -static int iio_dummy_evgen_create(void) -{ - int ret, i; - - iio_evgen = kzalloc(sizeof(*iio_evgen), GFP_KERNEL); - if (!iio_evgen) - return -ENOMEM; - - iio_evgen->base = irq_alloc_descs(-1, 0, IIO_EVENTGEN_NO, 0); - if (iio_evgen->base < 0) { - ret = iio_evgen->base; - kfree(iio_evgen); - return ret; - } - iio_evgen->chip.name = iio_evgen_name; - iio_evgen->chip.irq_mask = &iio_dummy_event_irqmask; - iio_evgen->chip.irq_unmask = &iio_dummy_event_irqunmask; - for (i = 0; i < IIO_EVENTGEN_NO; i++) { - irq_set_chip(iio_evgen->base + i, &iio_evgen->chip); - irq_set_handler(iio_evgen->base + i, &handle_simple_irq); - irq_modify_status(iio_evgen->base + i, - IRQ_NOREQUEST | IRQ_NOAUTOEN, - IRQ_NOPROBE); - } - init_irq_work(&iio_evgen->handler.work, iio_dummy_work_handler); - mutex_init(&iio_evgen->lock); - return 0; -} - -/** - * iio_dummy_evgen_get_irq() - get an evgen provided irq for a device - * - * This function will give a free allocated irq to a client device. - * That irq can then be caused to 'fire' by using the associated sysfs file. - */ -int iio_dummy_evgen_get_irq(void) -{ - int i, ret = 0; - - if (!iio_evgen) - return -ENODEV; - - mutex_lock(&iio_evgen->lock); - for (i = 0; i < IIO_EVENTGEN_NO; i++) - if (!iio_evgen->inuse[i]) { - ret = iio_evgen->base + i; - iio_evgen->inuse[i] = true; - break; - } - mutex_unlock(&iio_evgen->lock); - if (i == IIO_EVENTGEN_NO) - return -ENOMEM; - return ret; -} -EXPORT_SYMBOL_GPL(iio_dummy_evgen_get_irq); - -/** - * iio_dummy_evgen_release_irq() - give the irq back. - * @irq: irq being returned to the pool - * - * Used by client driver instances to give the irqs back when they disconnect - */ -void iio_dummy_evgen_release_irq(int irq) -{ - mutex_lock(&iio_evgen->lock); - iio_evgen->inuse[irq - iio_evgen->base] = false; - mutex_unlock(&iio_evgen->lock); -} -EXPORT_SYMBOL_GPL(iio_dummy_evgen_release_irq); - -struct iio_dummy_regs *iio_dummy_evgen_get_regs(int irq) -{ - return &iio_evgen->regs[irq - iio_evgen->base]; -} -EXPORT_SYMBOL_GPL(iio_dummy_evgen_get_regs); - -static void iio_dummy_evgen_free(void) -{ - irq_free_descs(iio_evgen->base, IIO_EVENTGEN_NO); - kfree(iio_evgen); -} - -static void iio_evgen_release(struct device *dev) -{ - iio_dummy_evgen_free(); -} - -static ssize_t iio_evgen_poke(struct device *dev, - struct device_attribute *attr, - const char *buf, - size_t len) -{ - struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); - unsigned long event; - int ret; - - ret = kstrtoul(buf, 10, &event); - if (ret) - return ret; - - iio_evgen->regs[this_attr->address].reg_id = this_attr->address; - iio_evgen->regs[this_attr->address].reg_data = event; - - iio_evgen->handler.irq = iio_evgen->base + this_attr->address; - if (iio_evgen->enabled[this_attr->address]) - irq_work_queue(&iio_evgen->handler.work); - - return len; -} - -static IIO_DEVICE_ATTR(poke_ev0, S_IWUSR, NULL, &iio_evgen_poke, 0); -static IIO_DEVICE_ATTR(poke_ev1, S_IWUSR, NULL, &iio_evgen_poke, 1); -static IIO_DEVICE_ATTR(poke_ev2, S_IWUSR, NULL, &iio_evgen_poke, 2); -static IIO_DEVICE_ATTR(poke_ev3, S_IWUSR, NULL, &iio_evgen_poke, 3); -static IIO_DEVICE_ATTR(poke_ev4, S_IWUSR, NULL, &iio_evgen_poke, 4); -static IIO_DEVICE_ATTR(poke_ev5, S_IWUSR, NULL, &iio_evgen_poke, 5); -static IIO_DEVICE_ATTR(poke_ev6, S_IWUSR, NULL, &iio_evgen_poke, 6); -static IIO_DEVICE_ATTR(poke_ev7, S_IWUSR, NULL, &iio_evgen_poke, 7); -static IIO_DEVICE_ATTR(poke_ev8, S_IWUSR, NULL, &iio_evgen_poke, 8); -static IIO_DEVICE_ATTR(poke_ev9, S_IWUSR, NULL, &iio_evgen_poke, 9); - -static struct attribute *iio_evgen_attrs[] = { - &iio_dev_attr_poke_ev0.dev_attr.attr, - &iio_dev_attr_poke_ev1.dev_attr.attr, - &iio_dev_attr_poke_ev2.dev_attr.attr, - &iio_dev_attr_poke_ev3.dev_attr.attr, - &iio_dev_attr_poke_ev4.dev_attr.attr, - &iio_dev_attr_poke_ev5.dev_attr.attr, - &iio_dev_attr_poke_ev6.dev_attr.attr, - &iio_dev_attr_poke_ev7.dev_attr.attr, - &iio_dev_attr_poke_ev8.dev_attr.attr, - &iio_dev_attr_poke_ev9.dev_attr.attr, - NULL, -}; - -static const struct attribute_group iio_evgen_group = { - .attrs = iio_evgen_attrs, -}; - -static const struct attribute_group *iio_evgen_groups[] = { - &iio_evgen_group, - NULL -}; - -static struct device iio_evgen_dev = { - .bus = &iio_bus_type, - .groups = iio_evgen_groups, - .release = &iio_evgen_release, -}; - -static __init int iio_dummy_evgen_init(void) -{ - int ret = iio_dummy_evgen_create(); - - if (ret < 0) - return ret; - device_initialize(&iio_evgen_dev); - dev_set_name(&iio_evgen_dev, "iio_evgen"); - return device_add(&iio_evgen_dev); -} -module_init(iio_dummy_evgen_init); - -static __exit void iio_dummy_evgen_exit(void) -{ - device_unregister(&iio_evgen_dev); -} -module_exit(iio_dummy_evgen_exit); - -MODULE_AUTHOR("Jonathan Cameron "); -MODULE_DESCRIPTION("IIO dummy driver"); -MODULE_LICENSE("GPL v2"); -- cgit v1.2.3-54-g00ecf