cregit-Linux how code gets into the kernel

Release 4.8 drivers/iio/trigger/iio-trig-sysfs.c

/*
 * 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_sysfs_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 = kstrtoul(buf, 10, &input); if (ret) return ret; ret = iio_sysfs_trigger_probe(input); if (ret) return ret; return len; }

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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 = kstrtoul(buf, 10, &input); if (ret) return ret; ret = iio_sysfs_trigger_remove(input); if (ret) return ret; return len; }

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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) { }

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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); }

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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; }

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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_sysfs_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_sysfs_trig_list_mut); return 0; out2: iio_trigger_put(t->trig); free_t: kfree(t); out1: mutex_unlock(&iio_sysfs_trig_list_mut); return ret; }

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lars-peter clausenlars-peter clausen218.57%337.50%
denis cioccadenis ciocca31.22%112.50%
Total245100.00%8100.00%


static int iio_sysfs_trigger_remove(int id) { bool foundit = false; struct iio_sysfs_trig *t; mutex_lock(&iio_sysfs_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_sysfs_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_sysfs_trig_list_mut); return 0; }

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jonathan cameronjonathan cameron7974.53%125.00%
michael hennerichmichael hennerich2321.70%125.00%
denis cioccadenis ciocca32.83%125.00%
lars-peter clausenlars-peter clausen10.94%125.00%
Total106100.00%4100.00%


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); }

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michael hennerichmichael hennerich1446.67%150.00%
Total30100.00%2100.00%

module_init(iio_sysfs_trig_init);
static void __exit iio_sysfs_trig_exit(void) { device_unregister(&iio_sysfs_trig_dev); }

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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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jonathan cameronjonathan cameron57663.93%541.67%
michael hennerichmichael hennerich23826.42%18.33%
lars-peter clausenlars-peter clausen788.66%433.33%
denis cioccadenis ciocca70.78%18.33%
jingoo hanjingoo han20.22%18.33%
Total901100.00%12100.00%
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