diff options
Diffstat (limited to 'drivers/staging/iio/trigger/iio-trig-sysfs.c')
| -rw-r--r-- | drivers/staging/iio/trigger/iio-trig-sysfs.c | 227 |
1 files changed, 0 insertions, 227 deletions
diff --git a/drivers/staging/iio/trigger/iio-trig-sysfs.c b/drivers/staging/iio/trigger/iio-trig-sysfs.c deleted file mode 100644 index b727bde8b7fe..000000000000 --- a/drivers/staging/iio/trigger/iio-trig-sysfs.c +++ /dev/null @@ -1,227 +0,0 @@ -/* - * Copyright 2011 Analog Devices Inc. - * - * Licensed under the GPL-2. - * - */ - -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/platform_device.h> -#include <linux/slab.h> -#include <linux/list.h> -#include <linux/irq_work.h> - -#include <linux/iio/iio.h> -#include <linux/iio/trigger.h> - -struct iio_sysfs_trig { - struct iio_trigger *trig; - struct irq_work work; - int id; - struct list_head l; -}; - -static LIST_HEAD(iio_sysfs_trig_list); -static DEFINE_MUTEX(iio_syfs_trig_list_mut); - -static int iio_sysfs_trigger_probe(int id); -static ssize_t iio_sysfs_trig_add(struct device *dev, - struct device_attribute *attr, - const char *buf, - size_t len) -{ - int ret; - unsigned long input; - - ret = strict_strtoul(buf, 10, &input); - if (ret) - return ret; - ret = iio_sysfs_trigger_probe(input); - if (ret) - return ret; - return len; -} -static DEVICE_ATTR(add_trigger, S_IWUSR, NULL, &iio_sysfs_trig_add); - -static int iio_sysfs_trigger_remove(int id); -static ssize_t iio_sysfs_trig_remove(struct device *dev, - struct device_attribute *attr, - const char *buf, - size_t len) -{ - int ret; - unsigned long input; - - ret = strict_strtoul(buf, 10, &input); - if (ret) - return ret; - ret = iio_sysfs_trigger_remove(input); - if (ret) - return ret; - return len; -} - -static DEVICE_ATTR(remove_trigger, S_IWUSR, NULL, &iio_sysfs_trig_remove); - -static struct attribute *iio_sysfs_trig_attrs[] = { - &dev_attr_add_trigger.attr, - &dev_attr_remove_trigger.attr, - NULL, -}; - -static const struct attribute_group iio_sysfs_trig_group = { - .attrs = iio_sysfs_trig_attrs, -}; - -static const struct attribute_group *iio_sysfs_trig_groups[] = { - &iio_sysfs_trig_group, - NULL -}; - - -/* Nothing to actually do upon release */ -static void iio_trigger_sysfs_release(struct device *dev) -{ -} - -static struct device iio_sysfs_trig_dev = { - .bus = &iio_bus_type, - .groups = iio_sysfs_trig_groups, - .release = &iio_trigger_sysfs_release, -}; - -static void iio_sysfs_trigger_work(struct irq_work *work) -{ - struct iio_sysfs_trig *trig = container_of(work, struct iio_sysfs_trig, - work); - - iio_trigger_poll(trig->trig, 0); -} - -static ssize_t iio_sysfs_trigger_poll(struct device *dev, - struct device_attribute *attr, const char *buf, size_t count) -{ - struct iio_trigger *trig = to_iio_trigger(dev); - struct iio_sysfs_trig *sysfs_trig = iio_trigger_get_drvdata(trig); - - irq_work_queue(&sysfs_trig->work); - - return count; -} - -static DEVICE_ATTR(trigger_now, S_IWUSR, NULL, iio_sysfs_trigger_poll); - -static struct attribute *iio_sysfs_trigger_attrs[] = { - &dev_attr_trigger_now.attr, - NULL, -}; - -static const struct attribute_group iio_sysfs_trigger_attr_group = { - .attrs = iio_sysfs_trigger_attrs, -}; - -static const struct attribute_group *iio_sysfs_trigger_attr_groups[] = { - &iio_sysfs_trigger_attr_group, - NULL -}; - -static const struct iio_trigger_ops iio_sysfs_trigger_ops = { - .owner = THIS_MODULE, -}; - -static int iio_sysfs_trigger_probe(int id) -{ - struct iio_sysfs_trig *t; - int ret; - bool foundit = false; - mutex_lock(&iio_syfs_trig_list_mut); - list_for_each_entry(t, &iio_sysfs_trig_list, l) - if (id == t->id) { - foundit = true; - break; - } - if (foundit) { - ret = -EINVAL; - goto out1; - } - t = kmalloc(sizeof(*t), GFP_KERNEL); - if (t == NULL) { - ret = -ENOMEM; - goto out1; - } - t->id = id; - t->trig = iio_trigger_alloc("sysfstrig%d", id); - if (!t->trig) { - ret = -ENOMEM; - goto free_t; - } - - t->trig->dev.groups = iio_sysfs_trigger_attr_groups; - t->trig->ops = &iio_sysfs_trigger_ops; - t->trig->dev.parent = &iio_sysfs_trig_dev; - iio_trigger_set_drvdata(t->trig, t); - - init_irq_work(&t->work, iio_sysfs_trigger_work); - - ret = iio_trigger_register(t->trig); - if (ret) - goto out2; - list_add(&t->l, &iio_sysfs_trig_list); - __module_get(THIS_MODULE); - mutex_unlock(&iio_syfs_trig_list_mut); - return 0; - -out2: - iio_trigger_put(t->trig); -free_t: - kfree(t); -out1: - mutex_unlock(&iio_syfs_trig_list_mut); - return ret; -} - -static int iio_sysfs_trigger_remove(int id) -{ - bool foundit = false; - struct iio_sysfs_trig *t; - mutex_lock(&iio_syfs_trig_list_mut); - list_for_each_entry(t, &iio_sysfs_trig_list, l) - if (id == t->id) { - foundit = true; - break; - } - if (!foundit) { - mutex_unlock(&iio_syfs_trig_list_mut); - return -EINVAL; - } - - iio_trigger_unregister(t->trig); - iio_trigger_free(t->trig); - - list_del(&t->l); - kfree(t); - module_put(THIS_MODULE); - mutex_unlock(&iio_syfs_trig_list_mut); - return 0; -} - - -static int __init iio_sysfs_trig_init(void) -{ - device_initialize(&iio_sysfs_trig_dev); - dev_set_name(&iio_sysfs_trig_dev, "iio_sysfs_trigger"); - return device_add(&iio_sysfs_trig_dev); -} -module_init(iio_sysfs_trig_init); - -static void __exit iio_sysfs_trig_exit(void) -{ - device_unregister(&iio_sysfs_trig_dev); -} -module_exit(iio_sysfs_trig_exit); - -MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); -MODULE_DESCRIPTION("Sysfs based trigger for the iio subsystem"); -MODULE_LICENSE("GPL v2"); -MODULE_ALIAS("platform:iio-trig-sysfs"); 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