nvmem: mediatek: Add Mediatek EFUSE driver (4c7e4fe3) · Commits · e / devices / android_kernel_oneplus_sm8150

drivers/nvmem/Kconfig

+11 −0

Original line number	Diff line number	Diff line
		@@ -45,6 +45,17 @@ config NVMEM_MXS_OCOTP
		This driver can also be built as a module. If so, the module
		will be called nvmem-mxs-ocotp.

		config MTK_EFUSE
		tristate "Mediatek SoCs EFUSE support"
		depends on ARCH_MEDIATEK \|\| COMPILE_TEST
		select REGMAP_MMIO
		help
		This is a driver to access hardware related data like sensor
		calibration, HDMI impedance etc.

		This driver can also be built as a module. If so, the module
		will be called efuse-mtk.

		config QCOM_QFPROM
		tristate "QCOM QFPROM Support"
		depends on ARCH_QCOM \|\| COMPILE_TEST

drivers/nvmem/Makefile

+2 −0

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		@@ -12,6 +12,8 @@ obj-$(CONFIG_NVMEM_LPC18XX_EEPROM) += nvmem_lpc18xx_eeprom.o
		nvmem_lpc18xx_eeprom-y := lpc18xx_eeprom.o
		obj-$(CONFIG_NVMEM_MXS_OCOTP) += nvmem-mxs-ocotp.o
		nvmem-mxs-ocotp-y := mxs-ocotp.o
		obj-$(CONFIG_MTK_EFUSE) += nvmem_mtk-efuse.o
		nvmem_mtk-efuse-y := mtk-efuse.o
		obj-$(CONFIG_QCOM_QFPROM) += nvmem_qfprom.o
		nvmem_qfprom-y := qfprom.o
		obj-$(CONFIG_ROCKCHIP_EFUSE) += nvmem_rockchip_efuse.o

drivers/nvmem/mtk-efuse.c

0 → 100644

+89 −0

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		/*
		* Copyright (c) 2015 MediaTek Inc.
		* Author: Andrew-CT Chen <andrew-ct.chen@mediatek.com>
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License version 2 as
		* published by the Free Software Foundation.
		*
		* This program is distributed in the hope that it will be useful,
		* but WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		* GNU General Public License for more details.
		*/

		#include <linux/device.h>
		#include <linux/module.h>
		#include <linux/nvmem-provider.h>
		#include <linux/platform_device.h>
		#include <linux/regmap.h>

		static struct regmap_config mtk_regmap_config = {
		.reg_bits = 32,
		.val_bits = 32,
		.reg_stride = 4,
		};

		static int mtk_efuse_probe(struct platform_device *pdev)
		{
		struct device *dev = &pdev->dev;
		struct resource *res;
		struct nvmem_device *nvmem;
		struct nvmem_config *econfig;
		struct regmap *regmap;
		void __iomem *base;

		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
		base = devm_ioremap_resource(dev, res);
		if (IS_ERR(base))
		return PTR_ERR(base);

		econfig = devm_kzalloc(dev, sizeof(*econfig), GFP_KERNEL);
		if (!econfig)
		return -ENOMEM;

		mtk_regmap_config.max_register = resource_size(res) - 1;

		regmap = devm_regmap_init_mmio(dev, base, &mtk_regmap_config);
		if (IS_ERR(regmap)) {
		dev_err(dev, "regmap init failed\n");
		return PTR_ERR(regmap);
		}

		econfig->dev = dev;
		econfig->owner = THIS_MODULE;
		nvmem = nvmem_register(econfig);
		if (IS_ERR(nvmem))
		return PTR_ERR(nvmem);

		platform_set_drvdata(pdev, nvmem);

		return 0;
		}

		static int mtk_efuse_remove(struct platform_device *pdev)
		{
		struct nvmem_device *nvmem = platform_get_drvdata(pdev);

		return nvmem_unregister(nvmem);
		}

		static const struct of_device_id mtk_efuse_of_match[] = {
		{ .compatible = "mediatek,mt8173-efuse",},
		{ .compatible = "mediatek,efuse",},
		{/* sentinel */},
		};
		MODULE_DEVICE_TABLE(of, mtk_efuse_of_match);

		static struct platform_driver mtk_efuse_driver = {
		.probe = mtk_efuse_probe,
		.remove = mtk_efuse_remove,
		.driver = {
		.name = "mediatek,efuse",
		.of_match_table = mtk_efuse_of_match,
		},
		};
		module_platform_driver(mtk_efuse_driver);
		MODULE_AUTHOR("Andrew-CT Chen <andrew-ct.chen@mediatek.com>");
		MODULE_DESCRIPTION("Mediatek EFUSE driver");
		MODULE_LICENSE("GPL v2");