apple-spmi-nvmem.c

 1// SPDX-License-Identifier: GPL-2.0-only OR MIT
 2/*
 3 * Apple SPMI NVMEM driver
 4 *
 5 * Copyright The Asahi Linux Contributors
 6 */
 7
 8#include <linux/kernel.h>
 9#include <linux/module.h>
10#include <linux/nvmem-provider.h>
11#include <linux/of.h>
12#include <linux/spmi.h>
13#include <linux/regmap.h>
14
15static const struct regmap_config apple_spmi_regmap_config = {
16	.reg_bits	= 16,
17	.val_bits	= 8,
18	.max_register	= 0xffff,
19};
20
21static int apple_spmi_nvmem_probe(struct spmi_device *sdev)
22{
23	struct regmap *regmap;
24	struct nvmem_config nvmem_cfg = {
25		.dev = &sdev->dev,
26		.name = "spmi_nvmem",
27		.id = NVMEM_DEVID_AUTO,
28		.word_size = 1,
29		.stride = 1,
30		.size = 0xffff,
31		.reg_read = (void *)regmap_bulk_read,
32		.reg_write = (void *)regmap_bulk_write,
33	};
34
35	regmap = devm_regmap_init_spmi_ext(sdev, &apple_spmi_regmap_config);
36	if (IS_ERR(regmap))
37		return PTR_ERR(regmap);
38
39	nvmem_cfg.priv = regmap;
40
41	return PTR_ERR_OR_ZERO(devm_nvmem_register(&sdev->dev, &nvmem_cfg));
42}
43
44static const struct of_device_id apple_spmi_nvmem_id_table[] = {
45	{ .compatible = "apple,spmi-nvmem" },
46	{ },
47};
48MODULE_DEVICE_TABLE(of, apple_spmi_nvmem_id_table);
49
50static struct spmi_driver apple_spmi_nvmem_driver = {
51	.probe = apple_spmi_nvmem_probe,
52	.driver = {
53		.name = "apple-spmi-nvmem",
54		.of_match_table	= apple_spmi_nvmem_id_table,
55	},
56};
57
58module_spmi_driver(apple_spmi_nvmem_driver);
59
60MODULE_LICENSE("Dual MIT/GPL");
61MODULE_AUTHOR("Hector Martin <marcan@marcan.st>");
62MODULE_DESCRIPTION("Apple SPMI NVMEM driver");