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b01ced2b50
Add support for LPTIMx_OUT triggers that can be found on some STM32 devices. These triggers can be used then by ADC or DAC. Typical usage is to configure LPTimer as PWM output (via pwm-stm32-lp) and have synchronised analog conversions with these triggers. Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
118 lines
2.7 KiB
C
118 lines
2.7 KiB
C
/*
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* STM32 Low-Power Timer Trigger driver
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*
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* Copyright (C) STMicroelectronics 2017
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*
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* Author: Fabrice Gasnier <fabrice.gasnier@st.com>.
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*
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* License terms: GNU General Public License (GPL), version 2
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*
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* Inspired by Benjamin Gaignard's stm32-timer-trigger driver
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*/
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#include <linux/iio/timer/stm32-lptim-trigger.h>
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#include <linux/mfd/stm32-lptimer.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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/* List Low-Power Timer triggers */
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static const char * const stm32_lptim_triggers[] = {
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LPTIM1_OUT,
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LPTIM2_OUT,
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LPTIM3_OUT,
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};
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struct stm32_lptim_trigger {
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struct device *dev;
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const char *trg;
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};
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static int stm32_lptim_validate_device(struct iio_trigger *trig,
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struct iio_dev *indio_dev)
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{
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if (indio_dev->modes & INDIO_HARDWARE_TRIGGERED)
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return 0;
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return -EINVAL;
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}
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static const struct iio_trigger_ops stm32_lptim_trigger_ops = {
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.owner = THIS_MODULE,
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.validate_device = stm32_lptim_validate_device,
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};
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/**
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* is_stm32_lptim_trigger
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* @trig: trigger to be checked
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*
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* return true if the trigger is a valid STM32 IIO Low-Power Timer Trigger
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* either return false
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*/
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bool is_stm32_lptim_trigger(struct iio_trigger *trig)
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{
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return (trig->ops == &stm32_lptim_trigger_ops);
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}
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EXPORT_SYMBOL(is_stm32_lptim_trigger);
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static int stm32_lptim_setup_trig(struct stm32_lptim_trigger *priv)
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{
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struct iio_trigger *trig;
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trig = devm_iio_trigger_alloc(priv->dev, "%s", priv->trg);
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if (!trig)
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return -ENOMEM;
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trig->dev.parent = priv->dev->parent;
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trig->ops = &stm32_lptim_trigger_ops;
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iio_trigger_set_drvdata(trig, priv);
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return devm_iio_trigger_register(priv->dev, trig);
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}
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static int stm32_lptim_trigger_probe(struct platform_device *pdev)
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{
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struct stm32_lptim_trigger *priv;
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u32 index;
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int ret;
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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if (of_property_read_u32(pdev->dev.of_node, "reg", &index))
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return -EINVAL;
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if (index >= ARRAY_SIZE(stm32_lptim_triggers))
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return -EINVAL;
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priv->dev = &pdev->dev;
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priv->trg = stm32_lptim_triggers[index];
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ret = stm32_lptim_setup_trig(priv);
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if (ret)
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return ret;
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platform_set_drvdata(pdev, priv);
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return 0;
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}
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static const struct of_device_id stm32_lptim_trig_of_match[] = {
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{ .compatible = "st,stm32-lptimer-trigger", },
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{},
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};
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MODULE_DEVICE_TABLE(of, stm32_lptim_trig_of_match);
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static struct platform_driver stm32_lptim_trigger_driver = {
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.probe = stm32_lptim_trigger_probe,
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.driver = {
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.name = "stm32-lptimer-trigger",
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.of_match_table = stm32_lptim_trig_of_match,
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},
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};
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module_platform_driver(stm32_lptim_trigger_driver);
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MODULE_AUTHOR("Fabrice Gasnier <fabrice.gasnier@st.com>");
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MODULE_ALIAS("platform:stm32-lptimer-trigger");
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MODULE_DESCRIPTION("STMicroelectronics STM32 LPTIM trigger driver");
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MODULE_LICENSE("GPL v2");
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