^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * STM32 Low-Power Timer Trigger driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) STMicroelectronics 2017
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Author: Fabrice Gasnier <fabrice.gasnier@st.com>.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Inspired by Benjamin Gaignard's stm32-timer-trigger driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/iio/timer/stm32-lptim-trigger.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/mfd/stm32-lptimer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) /* List Low-Power Timer triggers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) static const char * const stm32_lptim_triggers[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) LPTIM1_OUT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) LPTIM2_OUT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) LPTIM3_OUT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) struct stm32_lptim_trigger {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) const char *trg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) static int stm32_lptim_validate_device(struct iio_trigger *trig,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) struct iio_dev *indio_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) if (indio_dev->modes & INDIO_HARDWARE_TRIGGERED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) static const struct iio_trigger_ops stm32_lptim_trigger_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) .validate_device = stm32_lptim_validate_device,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * is_stm32_lptim_trigger
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * @trig: trigger to be checked
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * return true if the trigger is a valid STM32 IIO Low-Power Timer Trigger
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) * either return false
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) bool is_stm32_lptim_trigger(struct iio_trigger *trig)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) return (trig->ops == &stm32_lptim_trigger_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) EXPORT_SYMBOL(is_stm32_lptim_trigger);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) static int stm32_lptim_setup_trig(struct stm32_lptim_trigger *priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) struct iio_trigger *trig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) trig = devm_iio_trigger_alloc(priv->dev, "%s", priv->trg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) if (!trig)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) trig->dev.parent = priv->dev->parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) trig->ops = &stm32_lptim_trigger_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) iio_trigger_set_drvdata(trig, priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) return devm_iio_trigger_register(priv->dev, trig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) static int stm32_lptim_trigger_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) struct stm32_lptim_trigger *priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) u32 index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) if (!priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) if (of_property_read_u32(pdev->dev.of_node, "reg", &index))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) if (index >= ARRAY_SIZE(stm32_lptim_triggers))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) priv->dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) priv->trg = stm32_lptim_triggers[index];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) ret = stm32_lptim_setup_trig(priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) platform_set_drvdata(pdev, priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) static const struct of_device_id stm32_lptim_trig_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) { .compatible = "st,stm32-lptimer-trigger", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) {},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) MODULE_DEVICE_TABLE(of, stm32_lptim_trig_of_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) static struct platform_driver stm32_lptim_trigger_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) .probe = stm32_lptim_trigger_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) .name = "stm32-lptimer-trigger",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) .of_match_table = stm32_lptim_trig_of_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) module_platform_driver(stm32_lptim_trigger_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) MODULE_AUTHOR("Fabrice Gasnier <fabrice.gasnier@st.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) MODULE_ALIAS("platform:stm32-lptimer-trigger");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) MODULE_DESCRIPTION("STMicroelectronics STM32 LPTIM trigger driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) MODULE_LICENSE("GPL v2");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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