tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) 2015 Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 and
6 * only version 2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 */
13
14#include <linux/device.h>
15#include <linux/module.h>
16#include <linux/nvmem-provider.h>
17#include <linux/platform_device.h>
18#include <linux/regmap.h>
19
20static struct regmap_config qfprom_regmap_config = {
21 .reg_bits = 32,
22 .val_bits = 8,
23 .reg_stride = 1,
24};
25
26static struct nvmem_config econfig = {
27 .name = "qfprom",
28 .owner = THIS_MODULE,
29};
30
31static int qfprom_remove(struct platform_device *pdev)
32{
33 struct nvmem_device *nvmem = platform_get_drvdata(pdev);
34
35 return nvmem_unregister(nvmem);
36}
37
38static int qfprom_probe(struct platform_device *pdev)
39{
40 struct device *dev = &pdev->dev;
41 struct resource *res;
42 struct nvmem_device *nvmem;
43 struct regmap *regmap;
44 void __iomem *base;
45
46 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
47 base = devm_ioremap_resource(dev, res);
48 if (IS_ERR(base))
49 return PTR_ERR(base);
50
51 qfprom_regmap_config.max_register = resource_size(res) - 1;
52
53 regmap = devm_regmap_init_mmio(dev, base, &qfprom_regmap_config);
54 if (IS_ERR(regmap)) {
55 dev_err(dev, "regmap init failed\n");
56 return PTR_ERR(regmap);
57 }
58 econfig.dev = dev;
59 nvmem = nvmem_register(&econfig);
60 if (IS_ERR(nvmem))
61 return PTR_ERR(nvmem);
62
63 platform_set_drvdata(pdev, nvmem);
64
65 return 0;
66}
67
68static const struct of_device_id qfprom_of_match[] = {
69 { .compatible = "qcom,qfprom",},
70 {/* sentinel */},
71};
72MODULE_DEVICE_TABLE(of, qfprom_of_match);
73
74static struct platform_driver qfprom_driver = {
75 .probe = qfprom_probe,
76 .remove = qfprom_remove,
77 .driver = {
78 .name = "qcom,qfprom",
79 .of_match_table = qfprom_of_match,
80 },
81};
82module_platform_driver(qfprom_driver);
83MODULE_AUTHOR("Srinivas Kandagatla <srinivas.kandagatla@linaro.org>");
84MODULE_DESCRIPTION("Qualcomm QFPROM driver");
85MODULE_LICENSE("GPL v2");