1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
|
// SPDX-License-Identifier: GPL-2.0
/*
* ESM (Error Signal Monitor) driver for TI TPS6594/TPS6593/LP8764 PMICs
*
* Copyright (C) 2023 BayLibre Incorporated - https://www.baylibre.com/
*/
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/mfd/tps6594.h>
static irqreturn_t tps6594_esm_isr(int irq, void *dev_id)
{
struct platform_device *pdev = dev_id;
int i;
for (i = 0 ; i < pdev->num_resources ; i++) {
if (irq == platform_get_irq_byname(pdev, pdev->resource[i].name)) {
dev_err(pdev->dev.parent, "%s error detected\n", pdev->resource[i].name);
return IRQ_HANDLED;
}
}
return IRQ_NONE;
}
static int tps6594_esm_probe(struct platform_device *pdev)
{
struct tps6594 *tps = dev_get_drvdata(pdev->dev.parent);
struct device *dev = &pdev->dev;
int irq;
int ret;
int i;
for (i = 0 ; i < pdev->num_resources ; i++) {
irq = platform_get_irq_byname(pdev, pdev->resource[i].name);
if (irq < 0)
return irq;
ret = devm_request_threaded_irq(dev, irq, NULL,
tps6594_esm_isr, IRQF_ONESHOT,
pdev->resource[i].name, pdev);
if (ret)
return dev_err_probe(dev, ret, "Failed to request irq\n");
}
ret = regmap_set_bits(tps->regmap, TPS6594_REG_ESM_SOC_MODE_CFG,
TPS6594_BIT_ESM_SOC_EN | TPS6594_BIT_ESM_SOC_ENDRV);
if (ret)
return dev_err_probe(dev, ret, "Failed to configure ESM\n");
ret = regmap_set_bits(tps->regmap, TPS6594_REG_ESM_SOC_START_REG,
TPS6594_BIT_ESM_SOC_START);
if (ret)
return dev_err_probe(dev, ret, "Failed to start ESM\n");
pm_runtime_enable(dev);
pm_runtime_get_sync(dev);
return 0;
}
static void tps6594_esm_remove(struct platform_device *pdev)
{
struct tps6594 *tps = dev_get_drvdata(pdev->dev.parent);
struct device *dev = &pdev->dev;
int ret;
ret = regmap_clear_bits(tps->regmap, TPS6594_REG_ESM_SOC_START_REG,
TPS6594_BIT_ESM_SOC_START);
if (ret) {
dev_err(dev, "Failed to stop ESM\n");
goto out;
}
ret = regmap_clear_bits(tps->regmap, TPS6594_REG_ESM_SOC_MODE_CFG,
TPS6594_BIT_ESM_SOC_EN | TPS6594_BIT_ESM_SOC_ENDRV);
if (ret)
dev_err(dev, "Failed to unconfigure ESM\n");
out:
pm_runtime_put_sync(dev);
pm_runtime_disable(dev);
}
static int tps6594_esm_suspend(struct device *dev)
{
struct tps6594 *tps = dev_get_drvdata(dev->parent);
int ret;
ret = regmap_clear_bits(tps->regmap, TPS6594_REG_ESM_SOC_START_REG,
TPS6594_BIT_ESM_SOC_START);
pm_runtime_put_sync(dev);
return ret;
}
static int tps6594_esm_resume(struct device *dev)
{
struct tps6594 *tps = dev_get_drvdata(dev->parent);
pm_runtime_get_sync(dev);
return regmap_set_bits(tps->regmap, TPS6594_REG_ESM_SOC_START_REG,
TPS6594_BIT_ESM_SOC_START);
}
static DEFINE_SIMPLE_DEV_PM_OPS(tps6594_esm_pm_ops, tps6594_esm_suspend, tps6594_esm_resume);
static struct platform_driver tps6594_esm_driver = {
.driver = {
.name = "tps6594-esm",
.pm = pm_sleep_ptr(&tps6594_esm_pm_ops),
},
.probe = tps6594_esm_probe,
.remove_new = tps6594_esm_remove,
};
module_platform_driver(tps6594_esm_driver);
MODULE_ALIAS("platform:tps6594-esm");
MODULE_AUTHOR("Julien Panis <jpanis@baylibre.com>");
MODULE_DESCRIPTION("TPS6594 Error Signal Monitor Driver");
MODULE_LICENSE("GPL");
|
