2 * STM32 Low-Power Timer Trigger driver
4 * Copyright (C) STMicroelectronics 2017
6 * Author: Fabrice Gasnier <fabrice.gasnier@st.com>.
8 * License terms: GNU General Public License (GPL), version 2
10 * Inspired by Benjamin Gaignard's stm32-timer-trigger driver
13 #include <linux/iio/timer/stm32-lptim-trigger.h>
14 #include <linux/mfd/stm32-lptimer.h>
15 #include <linux/module.h>
16 #include <linux/platform_device.h>
18 /* List Low-Power Timer triggers */
19 static const char * const stm32_lptim_triggers[] = {
25 struct stm32_lptim_trigger {
30 static int stm32_lptim_validate_device(struct iio_trigger *trig,
31 struct iio_dev *indio_dev)
33 if (indio_dev->modes & INDIO_HARDWARE_TRIGGERED)
39 static const struct iio_trigger_ops stm32_lptim_trigger_ops = {
40 .validate_device = stm32_lptim_validate_device,
44 * is_stm32_lptim_trigger
45 * @trig: trigger to be checked
47 * return true if the trigger is a valid STM32 IIO Low-Power Timer Trigger
50 bool is_stm32_lptim_trigger(struct iio_trigger *trig)
52 return (trig->ops == &stm32_lptim_trigger_ops);
54 EXPORT_SYMBOL(is_stm32_lptim_trigger);
56 static int stm32_lptim_setup_trig(struct stm32_lptim_trigger *priv)
58 struct iio_trigger *trig;
60 trig = devm_iio_trigger_alloc(priv->dev, "%s", priv->trg);
64 trig->dev.parent = priv->dev->parent;
65 trig->ops = &stm32_lptim_trigger_ops;
66 iio_trigger_set_drvdata(trig, priv);
68 return devm_iio_trigger_register(priv->dev, trig);
71 static int stm32_lptim_trigger_probe(struct platform_device *pdev)
73 struct stm32_lptim_trigger *priv;
77 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
81 if (of_property_read_u32(pdev->dev.of_node, "reg", &index))
84 if (index >= ARRAY_SIZE(stm32_lptim_triggers))
87 priv->dev = &pdev->dev;
88 priv->trg = stm32_lptim_triggers[index];
90 ret = stm32_lptim_setup_trig(priv);
94 platform_set_drvdata(pdev, priv);
99 static const struct of_device_id stm32_lptim_trig_of_match[] = {
100 { .compatible = "st,stm32-lptimer-trigger", },
103 MODULE_DEVICE_TABLE(of, stm32_lptim_trig_of_match);
105 static struct platform_driver stm32_lptim_trigger_driver = {
106 .probe = stm32_lptim_trigger_probe,
108 .name = "stm32-lptimer-trigger",
109 .of_match_table = stm32_lptim_trig_of_match,
112 module_platform_driver(stm32_lptim_trigger_driver);
114 MODULE_AUTHOR("Fabrice Gasnier <fabrice.gasnier@st.com>");
115 MODULE_ALIAS("platform:stm32-lptimer-trigger");
116 MODULE_DESCRIPTION("STMicroelectronics STM32 LPTIM trigger driver");
117 MODULE_LICENSE("GPL v2");