mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-24 02:00:54 +07:00
fda8d26e61
Based on 1 normalized pattern(s): licensed under the gpl 2 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 135 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Steve Winslow <swinslow@gmail.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190528170026.071193225@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
142 lines
3.3 KiB
C
142 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright 2016 Jonathan Cameron <jic23@kernel.org>
|
|
*
|
|
* Based on a mashup of the hrtimer trigger and continuous sampling proposal of
|
|
* Gregor Boirie <gregor.boirie@parrot.com>
|
|
*
|
|
* Note this is still rather experimental and may eat babies.
|
|
*
|
|
* Todo
|
|
* * Protect against connection of devices that 'need' the top half
|
|
* handler.
|
|
* * Work out how to run top half handlers in this context if it is
|
|
* safe to do so (timestamp grabbing for example)
|
|
*
|
|
* Tested against a max1363. Used about 33% cpu for the thread and 20%
|
|
* for generic_buffer piping to /dev/null. Watermark set at 64 on a 128
|
|
* element kfifo buffer.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/irq_work.h>
|
|
#include <linux/kthread.h>
|
|
#include <linux/freezer.h>
|
|
|
|
#include <linux/iio/iio.h>
|
|
#include <linux/iio/trigger.h>
|
|
#include <linux/iio/sw_trigger.h>
|
|
|
|
struct iio_loop_info {
|
|
struct iio_sw_trigger swt;
|
|
struct task_struct *task;
|
|
};
|
|
|
|
static const struct config_item_type iio_loop_type = {
|
|
.ct_owner = THIS_MODULE,
|
|
};
|
|
|
|
static int iio_loop_thread(void *data)
|
|
{
|
|
struct iio_trigger *trig = data;
|
|
|
|
set_freezable();
|
|
|
|
do {
|
|
iio_trigger_poll_chained(trig);
|
|
} while (likely(!kthread_freezable_should_stop(NULL)));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int iio_loop_trigger_set_state(struct iio_trigger *trig, bool state)
|
|
{
|
|
struct iio_loop_info *loop_trig = iio_trigger_get_drvdata(trig);
|
|
|
|
if (state) {
|
|
loop_trig->task = kthread_run(iio_loop_thread,
|
|
trig, trig->name);
|
|
if (IS_ERR(loop_trig->task)) {
|
|
dev_err(&trig->dev,
|
|
"failed to create trigger loop thread\n");
|
|
return PTR_ERR(loop_trig->task);
|
|
}
|
|
} else {
|
|
kthread_stop(loop_trig->task);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct iio_trigger_ops iio_loop_trigger_ops = {
|
|
.set_trigger_state = iio_loop_trigger_set_state,
|
|
};
|
|
|
|
static struct iio_sw_trigger *iio_trig_loop_probe(const char *name)
|
|
{
|
|
struct iio_loop_info *trig_info;
|
|
int ret;
|
|
|
|
trig_info = kzalloc(sizeof(*trig_info), GFP_KERNEL);
|
|
if (!trig_info)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
trig_info->swt.trigger = iio_trigger_alloc("%s", name);
|
|
if (!trig_info->swt.trigger) {
|
|
ret = -ENOMEM;
|
|
goto err_free_trig_info;
|
|
}
|
|
|
|
iio_trigger_set_drvdata(trig_info->swt.trigger, trig_info);
|
|
trig_info->swt.trigger->ops = &iio_loop_trigger_ops;
|
|
|
|
ret = iio_trigger_register(trig_info->swt.trigger);
|
|
if (ret)
|
|
goto err_free_trigger;
|
|
|
|
iio_swt_group_init_type_name(&trig_info->swt, name, &iio_loop_type);
|
|
|
|
return &trig_info->swt;
|
|
|
|
err_free_trigger:
|
|
iio_trigger_free(trig_info->swt.trigger);
|
|
err_free_trig_info:
|
|
kfree(trig_info);
|
|
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
static int iio_trig_loop_remove(struct iio_sw_trigger *swt)
|
|
{
|
|
struct iio_loop_info *trig_info;
|
|
|
|
trig_info = iio_trigger_get_drvdata(swt->trigger);
|
|
|
|
iio_trigger_unregister(swt->trigger);
|
|
iio_trigger_free(swt->trigger);
|
|
kfree(trig_info);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct iio_sw_trigger_ops iio_trig_loop_ops = {
|
|
.probe = iio_trig_loop_probe,
|
|
.remove = iio_trig_loop_remove,
|
|
};
|
|
|
|
static struct iio_sw_trigger_type iio_trig_loop = {
|
|
.name = "loop",
|
|
.owner = THIS_MODULE,
|
|
.ops = &iio_trig_loop_ops,
|
|
};
|
|
|
|
module_iio_sw_trigger_driver(iio_trig_loop);
|
|
|
|
MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
|
|
MODULE_DESCRIPTION("Loop based trigger for the iio subsystem");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("platform:iio-trig-loop");
|