2 * Copyright (C) 2015 Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
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.
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.
14 #include <linux/device.h>
15 #include <linux/module.h>
17 #include <linux/nvmem-provider.h>
18 #include <linux/platform_device.h>
24 static int qfprom_reg_read(void *context,
25 unsigned int reg, void *_val, size_t bytes)
27 struct qfprom_priv *priv = context;
29 int i = 0, words = bytes;
32 *val++ = readb(priv->base + reg + i++);
37 static int qfprom_reg_write(void *context,
38 unsigned int reg, void *_val, size_t bytes)
40 struct qfprom_priv *priv = context;
42 int i = 0, words = bytes;
45 writeb(*val++, priv->base + reg + i++);
50 static struct nvmem_config econfig = {
54 .reg_read = qfprom_reg_read,
55 .reg_write = qfprom_reg_write,
58 static int qfprom_probe(struct platform_device *pdev)
60 struct device *dev = &pdev->dev;
62 struct nvmem_device *nvmem;
63 struct qfprom_priv *priv;
65 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
69 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
70 priv->base = devm_ioremap_resource(dev, res);
71 if (IS_ERR(priv->base))
72 return PTR_ERR(priv->base);
74 econfig.size = resource_size(res);
78 nvmem = devm_nvmem_register(dev, &econfig);
80 return PTR_ERR_OR_ZERO(nvmem);
83 static const struct of_device_id qfprom_of_match[] = {
84 { .compatible = "qcom,qfprom",},
87 MODULE_DEVICE_TABLE(of, qfprom_of_match);
89 static struct platform_driver qfprom_driver = {
90 .probe = qfprom_probe,
92 .name = "qcom,qfprom",
93 .of_match_table = qfprom_of_match,
96 module_platform_driver(qfprom_driver);
97 MODULE_AUTHOR("Srinivas Kandagatla <srinivas.kandagatla@linaro.org>");
98 MODULE_DESCRIPTION("Qualcomm QFPROM driver");
99 MODULE_LICENSE("GPL v2");