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01d0d2c42a
The nvmem core driver supports to read and write single byte. So, allow qfprom to support this feature. This change helps in extracting a required value based on bit-offset and number of bits for the required value in the nvmem cell. Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org> Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
105 lines
2.5 KiB
C
105 lines
2.5 KiB
C
/*
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* Copyright (C) 2015 Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/io.h>
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#include <linux/nvmem-provider.h>
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#include <linux/platform_device.h>
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static int qfprom_reg_read(void *context,
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unsigned int reg, void *_val, size_t bytes)
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{
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void __iomem *base = context;
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u8 *val = _val;
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int i = 0, words = bytes;
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while (words--)
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*val++ = readb(base + reg + i++);
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return 0;
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}
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static int qfprom_reg_write(void *context,
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unsigned int reg, void *_val, size_t bytes)
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{
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void __iomem *base = context;
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u8 *val = _val;
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int i = 0, words = bytes;
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while (words--)
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writeb(*val++, base + reg + i++);
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return 0;
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}
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static int qfprom_remove(struct platform_device *pdev)
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{
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struct nvmem_device *nvmem = platform_get_drvdata(pdev);
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return nvmem_unregister(nvmem);
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}
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static struct nvmem_config econfig = {
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.name = "qfprom",
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.owner = THIS_MODULE,
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.stride = 1,
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.word_size = 1,
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.reg_read = qfprom_reg_read,
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.reg_write = qfprom_reg_write,
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};
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static int qfprom_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct resource *res;
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struct nvmem_device *nvmem;
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void __iomem *base;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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base = devm_ioremap_resource(dev, res);
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if (IS_ERR(base))
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return PTR_ERR(base);
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econfig.size = resource_size(res);
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econfig.dev = dev;
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econfig.priv = base;
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nvmem = nvmem_register(&econfig);
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if (IS_ERR(nvmem))
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return PTR_ERR(nvmem);
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platform_set_drvdata(pdev, nvmem);
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return 0;
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}
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static const struct of_device_id qfprom_of_match[] = {
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{ .compatible = "qcom,qfprom",},
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{/* sentinel */},
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};
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MODULE_DEVICE_TABLE(of, qfprom_of_match);
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static struct platform_driver qfprom_driver = {
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.probe = qfprom_probe,
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.remove = qfprom_remove,
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.driver = {
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.name = "qcom,qfprom",
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.of_match_table = qfprom_of_match,
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},
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};
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module_platform_driver(qfprom_driver);
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MODULE_AUTHOR("Srinivas Kandagatla <srinivas.kandagatla@linaro.org>");
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MODULE_DESCRIPTION("Qualcomm QFPROM driver");
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MODULE_LICENSE("GPL v2");
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