linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * STM32 Low-Power Timer Trigger driver

 *

 * Copyright (C) STMicroelectronics 2017

 *

 * Author: Fabrice Gasnier <fabrice.gasnier@st.com>.

 *

 * 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;