118 lines
2.7 KiB
C
118 lines
2.7 KiB
C
|
/*
|
||
|
|
* STM32 Low-Power Timer Trigger driver
|
||
|
|
*
|
||
|
|
* Copyright (C) STMicroelectronics 2017
|
||
|
|
*
|
||
|
|
* Author: Fabrice Gasnier <fabrice.gasnier@st.com>.
|
||
|
|
*
|
||
|
|
* License terms: GNU General Public License (GPL), version 2
|
||
|
|
*
|
||
|
|
* Inspired by Benjamin Gaignard's stm32-timer-trigger driver
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/iio/timer/stm32-lptim-trigger.h>
|
||
|
|
#include <linux/mfd/stm32-lptimer.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/platform_device.h>
|
||
|
|
|
||
|
|
/* List Low-Power Timer triggers */
|
||
|
|
static const char * const stm32_lptim_triggers[] = {
|
||
|
|
LPTIM1_OUT,
|
||
|
|
LPTIM2_OUT,
|
||
|
|
LPTIM3_OUT,
|
||
|
|
};
|
||
|
|
|
||
|
|
struct stm32_lptim_trigger {
|
||
|
|
struct device *dev;
|
||
|
|
const char *trg;
|
||
|
|
};
|
||
|
|
|
||
|
|
static int stm32_lptim_validate_device(struct iio_trigger *trig,
|
||
|
|
struct iio_dev *indio_dev)
|
||
|
|
{
|
||
|
|
if (indio_dev->modes & INDIO_HARDWARE_TRIGGERED)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct iio_trigger_ops stm32_lptim_trigger_ops = {
|
||
|
|
.validate_device = stm32_lptim_validate_device,
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* is_stm32_lptim_trigger
|
||
|
|
* @trig: trigger to be checked
|
||
|
|
*
|
||
|
|
* return true if the trigger is a valid STM32 IIO Low-Power Timer Trigger
|
||
|
|
* either return false
|
||
|
|
*/
|
||
|
|
bool is_stm32_lptim_trigger(struct iio_trigger *trig)
|
||
|
|
{
|
||
|
|
return (trig->ops == &stm32_lptim_trigger_ops);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(is_stm32_lptim_trigger);
|
||
|
|
|
||
|
|
static int stm32_lptim_setup_trig(struct stm32_lptim_trigger *priv)
|
||
|
|
{
|
||
|
|
struct iio_trigger *trig;
|
||
|
|
|
||
|
|
trig = devm_iio_trigger_alloc(priv->dev, "%s", priv->trg);
|
||
|
|
if (!trig)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
trig->dev.parent = priv->dev->parent;
|
||
|
|
trig->ops = &stm32_lptim_trigger_ops;
|
||
|
|
iio_trigger_set_drvdata(trig, priv);
|
||
|
|
|
||
|
|
return devm_iio_trigger_register(priv->dev, trig);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int stm32_lptim_trigger_probe(struct platform_device *pdev)
|
||
|
|
{
|
||
|
|
struct stm32_lptim_trigger *priv;
|
||
|
|
u32 index;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
|
||
|
|
if (!priv)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
if (of_property_read_u32(pdev->dev.of_node, "reg", &index))
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
if (index >= ARRAY_SIZE(stm32_lptim_triggers))
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
priv->dev = &pdev->dev;
|
||
|
|
priv->trg = stm32_lptim_triggers[index];
|
||
|
|
|
||
|
|
ret = stm32_lptim_setup_trig(priv);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
platform_set_drvdata(pdev, priv);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct of_device_id stm32_lptim_trig_of_match[] = {
|
||
|
|
{ .compatible = "st,stm32-lptimer-trigger", },
|
||
|
|
{},
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(of, stm32_lptim_trig_of_match);
|
||
|
|
|
||
|
|
static struct platform_driver stm32_lptim_trigger_driver = {
|
||
|
|
.probe = stm32_lptim_trigger_probe,
|
||
|
|
.driver = {
|
||
|
|
.name = "stm32-lptimer-trigger",
|
||
|
|
.of_match_table = stm32_lptim_trig_of_match,
|
||
|
|
},
|
||
|
|
};
|
||
|
|
module_platform_driver(stm32_lptim_trigger_driver);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Fabrice Gasnier <fabrice.gasnier@st.com>");
|
||
|
|
MODULE_ALIAS("platform:stm32-lptimer-trigger");
|
||
|
|
MODULE_DESCRIPTION("STMicroelectronics STM32 LPTIM trigger driver");
|
||
|
|
MODULE_LICENSE("GPL v2");
|