gpio-elkhartlake.c

 1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * Intel Elkhart Lake PSE GPIO driver
 4 *
 5 * Copyright (c) 2023, 2025 Intel Corporation.
 6 *
 7 * Authors: Pandith N <pandith.n@intel.com>
 8 *          Raag Jadav <raag.jadav@intel.com>
 9 */
10
11#include <linux/auxiliary_bus.h>
12#include <linux/device.h>
13#include <linux/err.h>
14#include <linux/module.h>
15#include <linux/pm.h>
16
17#include <linux/ehl_pse_io_aux.h>
18
19#include "gpio-tangier.h"
20
21/* Each Intel EHL PSE GPIO Controller has 30 GPIO pins */
22#define EHL_PSE_NGPIO		30
23
24static int ehl_gpio_probe(struct auxiliary_device *adev, const struct auxiliary_device_id *id)
25{
26	struct device *dev = &adev->dev;
27	struct ehl_pse_io_data *data;
28	struct tng_gpio *priv;
29	int ret;
30
31	data = dev_get_platdata(dev);
32	if (!data)
33		return -ENODATA;
34
35	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
36	if (!priv)
37		return -ENOMEM;
38
39	priv->reg_base = devm_ioremap_resource(dev, &data->mem);
40	if (IS_ERR(priv->reg_base))
41		return PTR_ERR(priv->reg_base);
42
43	priv->dev = dev;
44	priv->irq = data->irq;
45
46	priv->info.base = -1;
47	priv->info.ngpio = EHL_PSE_NGPIO;
48
49	priv->wake_regs.gwmr = GWMR_EHL;
50	priv->wake_regs.gwsr = GWSR_EHL;
51	priv->wake_regs.gsir = GSIR_EHL;
52
53	ret = devm_tng_gpio_probe(dev, priv);
54	if (ret)
55		return dev_err_probe(dev, ret, "tng_gpio_probe error\n");
56
57	auxiliary_set_drvdata(adev, priv);
58	return 0;
59}
60
61static const struct auxiliary_device_id ehl_gpio_ids[] = {
62	{ EHL_PSE_IO_NAME "." EHL_PSE_GPIO_NAME },
63	{ }
64};
65MODULE_DEVICE_TABLE(auxiliary, ehl_gpio_ids);
66
67static struct auxiliary_driver ehl_gpio_driver = {
68	.driver	= {
69		.pm	= pm_sleep_ptr(&tng_gpio_pm_ops),
70	},
71	.probe		= ehl_gpio_probe,
72	.id_table	= ehl_gpio_ids,
73};
74module_auxiliary_driver(ehl_gpio_driver);
75
76MODULE_AUTHOR("Pandith N <pandith.n@intel.com>");
77MODULE_AUTHOR("Raag Jadav <raag.jadav@intel.com>");
78MODULE_DESCRIPTION("Intel Elkhart Lake PSE GPIO driver");
79MODULE_LICENSE("GPL");
80MODULE_IMPORT_NS("GPIO_TANGIER");