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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * STM32 Low-Power Timer Trigger driver
4 *
5 * Copyright (C) STMicroelectronics 2017
6 *
7 * Author: Fabrice Gasnier <fabrice.gasnier@st.com>.
8 *
9 * Inspired by Benjamin Gaignard's stm32-timer-trigger driver
10 */
11
12#include <linux/iio/timer/stm32-lptim-trigger.h>
13#include <linux/mfd/stm32-lptimer.h>
14#include <linux/module.h>
15#include <linux/platform_device.h>
16
17/* List Low-Power Timer triggers */
18static const char * const stm32_lptim_triggers[] = {
19 LPTIM1_OUT,
20 LPTIM2_OUT,
21 LPTIM3_OUT,
22};
23
24struct stm32_lptim_trigger {
25 struct device *dev;
26 const char *trg;
27};
28
29static int stm32_lptim_validate_device(struct iio_trigger *trig,
30 struct iio_dev *indio_dev)
31{
32 if (indio_dev->modes & INDIO_HARDWARE_TRIGGERED)
33 return 0;
34
35 return -EINVAL;
36}
37
38static const struct iio_trigger_ops stm32_lptim_trigger_ops = {
39 .validate_device = stm32_lptim_validate_device,
40};
41
42/**
43 * is_stm32_lptim_trigger
44 * @trig: trigger to be checked
45 *
46 * return true if the trigger is a valid STM32 IIO Low-Power Timer Trigger
47 * either return false
48 */
49bool is_stm32_lptim_trigger(struct iio_trigger *trig)
50{
51 return (trig->ops == &stm32_lptim_trigger_ops);
52}
53EXPORT_SYMBOL(is_stm32_lptim_trigger);
54
55static int stm32_lptim_setup_trig(struct stm32_lptim_trigger *priv)
56{
57 struct iio_trigger *trig;
58
59 trig = devm_iio_trigger_alloc(priv->dev, "%s", priv->trg);
60 if (!trig)
61 return -ENOMEM;
62
63 trig->dev.parent = priv->dev->parent;
64 trig->ops = &stm32_lptim_trigger_ops;
65 iio_trigger_set_drvdata(trig, priv);
66
67 return devm_iio_trigger_register(priv->dev, trig);
68}
69
70static int stm32_lptim_trigger_probe(struct platform_device *pdev)
71{
72 struct stm32_lptim_trigger *priv;
73 u32 index;
74 int ret;
75
76 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
77 if (!priv)
78 return -ENOMEM;
79
80 if (of_property_read_u32(pdev->dev.of_node, "reg", &index))
81 return -EINVAL;
82
83 if (index >= ARRAY_SIZE(stm32_lptim_triggers))
84 return -EINVAL;
85
86 priv->dev = &pdev->dev;
87 priv->trg = stm32_lptim_triggers[index];
88
89 ret = stm32_lptim_setup_trig(priv);
90 if (ret)
91 return ret;
92
93 platform_set_drvdata(pdev, priv);
94
95 return 0;
96}
97
98static const struct of_device_id stm32_lptim_trig_of_match[] = {
99 { .compatible = "st,stm32-lptimer-trigger", },
100 {},
101};
102MODULE_DEVICE_TABLE(of, stm32_lptim_trig_of_match);
103
104static struct platform_driver stm32_lptim_trigger_driver = {
105 .probe = stm32_lptim_trigger_probe,
106 .driver = {
107 .name = "stm32-lptimer-trigger",
108 .of_match_table = stm32_lptim_trig_of_match,
109 },
110};
111module_platform_driver(stm32_lptim_trigger_driver);
112
113MODULE_AUTHOR("Fabrice Gasnier <fabrice.gasnier@st.com>");
114MODULE_ALIAS("platform:stm32-lptimer-trigger");
115MODULE_DESCRIPTION("STMicroelectronics STM32 LPTIM trigger driver");
116MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * STM32 Low-Power Timer Trigger driver
4 *
5 * Copyright (C) STMicroelectronics 2017
6 *
7 * Author: Fabrice Gasnier <fabrice.gasnier@st.com>.
8 *
9 * Inspired by Benjamin Gaignard's stm32-timer-trigger driver
10 */
11
12#include <linux/iio/timer/stm32-lptim-trigger.h>
13#include <linux/mfd/stm32-lptimer.h>
14#include <linux/mod_devicetable.h>
15#include <linux/module.h>
16#include <linux/platform_device.h>
17#include <linux/property.h>
18
19/* List Low-Power Timer triggers */
20static const char * const stm32_lptim_triggers[] = {
21 LPTIM1_OUT,
22 LPTIM2_OUT,
23 LPTIM3_OUT,
24};
25
26struct stm32_lptim_trigger {
27 struct device *dev;
28 const char *trg;
29};
30
31static int stm32_lptim_validate_device(struct iio_trigger *trig,
32 struct iio_dev *indio_dev)
33{
34 if (indio_dev->modes & INDIO_HARDWARE_TRIGGERED)
35 return 0;
36
37 return -EINVAL;
38}
39
40static const struct iio_trigger_ops stm32_lptim_trigger_ops = {
41 .validate_device = stm32_lptim_validate_device,
42};
43
44/**
45 * is_stm32_lptim_trigger
46 * @trig: trigger to be checked
47 *
48 * return true if the trigger is a valid STM32 IIO Low-Power Timer Trigger
49 * either return false
50 */
51bool is_stm32_lptim_trigger(struct iio_trigger *trig)
52{
53 return (trig->ops == &stm32_lptim_trigger_ops);
54}
55EXPORT_SYMBOL(is_stm32_lptim_trigger);
56
57static int stm32_lptim_setup_trig(struct stm32_lptim_trigger *priv)
58{
59 struct iio_trigger *trig;
60
61 trig = devm_iio_trigger_alloc(priv->dev, "%s", priv->trg);
62 if (!trig)
63 return -ENOMEM;
64
65 trig->dev.parent = priv->dev->parent;
66 trig->ops = &stm32_lptim_trigger_ops;
67 iio_trigger_set_drvdata(trig, priv);
68
69 return devm_iio_trigger_register(priv->dev, trig);
70}
71
72static int stm32_lptim_trigger_probe(struct platform_device *pdev)
73{
74 struct stm32_lptim_trigger *priv;
75 u32 index;
76
77 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
78 if (!priv)
79 return -ENOMEM;
80
81 if (device_property_read_u32(&pdev->dev, "reg", &index))
82 return -EINVAL;
83
84 if (index >= ARRAY_SIZE(stm32_lptim_triggers))
85 return -EINVAL;
86
87 priv->dev = &pdev->dev;
88 priv->trg = stm32_lptim_triggers[index];
89
90 return stm32_lptim_setup_trig(priv);
91}
92
93static const struct of_device_id stm32_lptim_trig_of_match[] = {
94 { .compatible = "st,stm32-lptimer-trigger", },
95 {},
96};
97MODULE_DEVICE_TABLE(of, stm32_lptim_trig_of_match);
98
99static struct platform_driver stm32_lptim_trigger_driver = {
100 .probe = stm32_lptim_trigger_probe,
101 .driver = {
102 .name = "stm32-lptimer-trigger",
103 .of_match_table = stm32_lptim_trig_of_match,
104 },
105};
106module_platform_driver(stm32_lptim_trigger_driver);
107
108MODULE_AUTHOR("Fabrice Gasnier <fabrice.gasnier@st.com>");
109MODULE_ALIAS("platform:stm32-lptimer-trigger");
110MODULE_DESCRIPTION("STMicroelectronics STM32 LPTIM trigger driver");
111MODULE_LICENSE("GPL v2");