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/mod_devicetable.h>
17#include <linux/io.h>
18#include <linux/nvmem-provider.h>
19#include <linux/platform_device.h>
20
21struct qfprom_priv {
22 void __iomem *base;
23};
24
25static int qfprom_reg_read(void *context,
26 unsigned int reg, void *_val, size_t bytes)
27{
28 struct qfprom_priv *priv = context;
29 u8 *val = _val;
30 int i = 0, words = bytes;
31
32 while (words--)
33 *val++ = readb(priv->base + reg + i++);
34
35 return 0;
36}
37
38static int qfprom_reg_write(void *context,
39 unsigned int reg, void *_val, size_t bytes)
40{
41 struct qfprom_priv *priv = context;
42 u8 *val = _val;
43 int i = 0, words = bytes;
44
45 while (words--)
46 writeb(*val++, priv->base + reg + i++);
47
48 return 0;
49}
50
51static struct nvmem_config econfig = {
52 .name = "qfprom",
53 .stride = 1,
54 .word_size = 1,
55 .reg_read = qfprom_reg_read,
56 .reg_write = qfprom_reg_write,
57};
58
59static int qfprom_probe(struct platform_device *pdev)
60{
61 struct device *dev = &pdev->dev;
62 struct resource *res;
63 struct nvmem_device *nvmem;
64 struct qfprom_priv *priv;
65
66 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
67 if (!priv)
68 return -ENOMEM;
69
70 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
71 priv->base = devm_ioremap_resource(dev, res);
72 if (IS_ERR(priv->base))
73 return PTR_ERR(priv->base);
74
75 econfig.size = resource_size(res);
76 econfig.dev = dev;
77 econfig.priv = priv;
78
79 nvmem = devm_nvmem_register(dev, &econfig);
80
81 return PTR_ERR_OR_ZERO(nvmem);
82}
83
84static const struct of_device_id qfprom_of_match[] = {
85 { .compatible = "qcom,qfprom",},
86 {/* sentinel */},
87};
88MODULE_DEVICE_TABLE(of, qfprom_of_match);
89
90static struct platform_driver qfprom_driver = {
91 .probe = qfprom_probe,
92 .driver = {
93 .name = "qcom,qfprom",
94 .of_match_table = qfprom_of_match,
95 },
96};
97module_platform_driver(qfprom_driver);
98MODULE_AUTHOR("Srinivas Kandagatla <srinivas.kandagatla@linaro.org>");
99MODULE_DESCRIPTION("Qualcomm QFPROM driver");
100MODULE_LICENSE("GPL v2");