2 * Copyright 2011 Analog Devices Inc.
4 * Licensed under the GPL-2.
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/platform_device.h>
11 #include <linux/slab.h>
12 #include <linux/list.h>
15 #include "../trigger.h"
17 struct iio_sysfs_trig {
18 struct iio_trigger *trig;
23 static LIST_HEAD(iio_sysfs_trig_list);
24 static DEFINE_MUTEX(iio_syfs_trig_list_mut);
26 static int iio_sysfs_trigger_probe(int id);
27 static ssize_t iio_sysfs_trig_add(struct device *dev,
28 struct device_attribute *attr,
35 ret = strict_strtoul(buf, 10, &input);
38 ret = iio_sysfs_trigger_probe(input);
43 static DEVICE_ATTR(add_trigger, S_IWUSR, NULL, &iio_sysfs_trig_add);
45 static int iio_sysfs_trigger_remove(int id);
46 static ssize_t iio_sysfs_trig_remove(struct device *dev,
47 struct device_attribute *attr,
54 ret = strict_strtoul(buf, 10, &input);
57 ret = iio_sysfs_trigger_remove(input);
63 static DEVICE_ATTR(remove_trigger, S_IWUSR, NULL, &iio_sysfs_trig_remove);
65 static struct attribute *iio_sysfs_trig_attrs[] = {
66 &dev_attr_add_trigger.attr,
67 &dev_attr_remove_trigger.attr,
71 static const struct attribute_group iio_sysfs_trig_group = {
72 .attrs = iio_sysfs_trig_attrs,
75 static const struct attribute_group *iio_sysfs_trig_groups[] = {
76 &iio_sysfs_trig_group,
81 /* Nothing to actually do upon release */
82 static void iio_trigger_sysfs_release(struct device *dev)
86 static struct device iio_sysfs_trig_dev = {
88 .groups = iio_sysfs_trig_groups,
89 .release = &iio_trigger_sysfs_release,
92 static ssize_t iio_sysfs_trigger_poll(struct device *dev,
93 struct device_attribute *attr, const char *buf, size_t count)
95 struct iio_trigger *trig = dev_get_drvdata(dev);
96 iio_trigger_poll_chained(trig, 0);
101 static DEVICE_ATTR(trigger_now, S_IWUSR, NULL, iio_sysfs_trigger_poll);
103 static struct attribute *iio_sysfs_trigger_attrs[] = {
104 &dev_attr_trigger_now.attr,
108 static const struct attribute_group iio_sysfs_trigger_attr_group = {
109 .attrs = iio_sysfs_trigger_attrs,
112 static const struct attribute_group *iio_sysfs_trigger_attr_groups[] = {
113 &iio_sysfs_trigger_attr_group,
117 static const struct iio_trigger_ops iio_sysfs_trigger_ops = {
118 .owner = THIS_MODULE,
121 static int iio_sysfs_trigger_probe(int id)
123 struct iio_sysfs_trig *t;
125 bool foundit = false;
126 mutex_lock(&iio_syfs_trig_list_mut);
127 list_for_each_entry(t, &iio_sysfs_trig_list, l)
136 t = kmalloc(sizeof(*t), GFP_KERNEL);
142 t->trig = iio_allocate_trigger("sysfstrig%d", id);
148 t->trig->dev.groups = iio_sysfs_trigger_attr_groups;
149 t->trig->ops = &iio_sysfs_trigger_ops;
150 t->trig->dev.parent = &iio_sysfs_trig_dev;
152 ret = iio_trigger_register(t->trig);
155 list_add(&t->l, &iio_sysfs_trig_list);
156 __module_get(THIS_MODULE);
157 mutex_unlock(&iio_syfs_trig_list_mut);
161 iio_put_trigger(t->trig);
165 mutex_unlock(&iio_syfs_trig_list_mut);
169 static int iio_sysfs_trigger_remove(int id)
171 bool foundit = false;
172 struct iio_sysfs_trig *t;
173 mutex_lock(&iio_syfs_trig_list_mut);
174 list_for_each_entry(t, &iio_sysfs_trig_list, l)
180 mutex_unlock(&iio_syfs_trig_list_mut);
184 iio_trigger_unregister(t->trig);
185 iio_free_trigger(t->trig);
189 module_put(THIS_MODULE);
190 mutex_unlock(&iio_syfs_trig_list_mut);
195 static int __init iio_sysfs_trig_init(void)
197 device_initialize(&iio_sysfs_trig_dev);
198 dev_set_name(&iio_sysfs_trig_dev, "iio_sysfs_trigger");
199 return device_add(&iio_sysfs_trig_dev);
201 module_init(iio_sysfs_trig_init);
203 static void __exit iio_sysfs_trig_exit(void)
205 device_unregister(&iio_sysfs_trig_dev);
207 module_exit(iio_sysfs_trig_exit);
209 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
210 MODULE_DESCRIPTION("Sysfs based trigger for the iio subsystem");
211 MODULE_LICENSE("GPL v2");
212 MODULE_ALIAS("platform:iio-trig-sysfs");