mfd: Add HI6421 PMIC Core driver (8bdf87b4) · Commits · e / devices / android_kernel_xiaomi_markw

drivers/mfd/Kconfig

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		@@ -210,6 +210,19 @@ config MFD_MC13XXX_I2C
		help
		Select this if your MC13xxx is connected via an I2C bus.

		config MFD_HI6421_PMIC
		tristate "HiSilicon Hi6421 PMU/Codec IC"
		depends on OF
		select MFD_CORE
		select REGMAP_MMIO
		help
		Add support for HiSilicon Hi6421 PMIC. Hi6421 includes multi-
		functions, such as regulators, RTC, codec, Coulomb counter, etc.
		This driver includes core APIs _only_. You have to select
		individul components like voltage regulators under corresponding
		menus in order to enable them.
		We communicate with the Hi6421 via memory-mapped I/O.

		config HTC_EGPIO
		bool "HTC EGPIO support"
		depends on GPIOLIB && ARM

drivers/mfd/Makefile

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		@@ -172,6 +172,7 @@ obj-$(CONFIG_MFD_AS3722) += as3722.o
		obj-$(CONFIG_MFD_STW481X) += stw481x.o
		obj-$(CONFIG_MFD_IPAQ_MICRO) += ipaq-micro.o
		obj-$(CONFIG_MFD_MENF21BMC) += menf21bmc.o
		obj-$(CONFIG_MFD_HI6421_PMIC) += hi6421-pmic-core.o

		intel-soc-pmic-objs := intel_soc_pmic_core.o intel_soc_pmic_crc.o
		obj-$(CONFIG_INTEL_SOC_PMIC) += intel-soc-pmic.o

drivers/mfd/hi6421-pmic-core.c

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		/*
		* Device driver for Hi6421 IC
		*
		* Copyright (c) <2011-2014> HiSilicon Technologies Co., Ltd.
		* http://www.hisilicon.com
		* Copyright (c) <2013-2014> Linaro Ltd.
		* http://www.linaro.org
		*
		* Author: Guodong Xu <guodong.xu@linaro.org>
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License as published by
		* the Free Software Foundation; either version 2 of the License, or
		* (at your option) any later version.
		*
		* This program is distributed in the hope 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.
		*
		* You should have received a copy of the GNU General Public License
		* along with this program. If not, see <http://www.gnu.org/licenses/>.
		*/

		#include <linux/device.h>
		#include <linux/err.h>
		#include <linux/mfd/core.h>
		#include <linux/module.h>
		#include <linux/of.h>
		#include <linux/platform_device.h>
		#include <linux/regmap.h>
		#include <linux/mfd/hi6421-pmic.h>

		static const struct mfd_cell hi6421_devs[] = {
		{ .name = "hi6421-regulator", },
		};

		static struct regmap_config hi6421_regmap_config = {
		.reg_bits = 32,
		.reg_stride = 4,
		.val_bits = 8,
		.max_register = HI6421_REG_TO_BUS_ADDR(HI6421_REG_MAX),
		};

		static int hi6421_pmic_probe(struct platform_device *pdev)
		{
		struct hi6421_pmic *pmic;
		struct resource *res;
		void __iomem *base;
		int ret;

		pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL);
		if (!pmic)
		return -ENOMEM;

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

		pmic->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base,
		&hi6421_regmap_config);
		if (IS_ERR(pmic->regmap)) {
		dev_err(&pdev->dev,
		"regmap init failed: %ld\n", PTR_ERR(pmic->regmap));
		return PTR_ERR(pmic->regmap);
		}

		/* set over-current protection debounce 8ms */
		regmap_update_bits(pmic->regmap, HI6421_OCP_DEB_CTRL_REG,
		(HI6421_OCP_DEB_SEL_MASK
		\| HI6421_OCP_EN_DEBOUNCE_MASK
		\| HI6421_OCP_AUTO_STOP_MASK),
		(HI6421_OCP_DEB_SEL_8MS
		\| HI6421_OCP_EN_DEBOUNCE_ENABLE));

		platform_set_drvdata(pdev, pmic);

		ret = mfd_add_devices(&pdev->dev, 0, hi6421_devs,
		ARRAY_SIZE(hi6421_devs), NULL, 0, NULL);
		if (ret) {
		dev_err(&pdev->dev, "add mfd devices failed: %d\n", ret);
		return ret;
		}

		return 0;
		}

		static int hi6421_pmic_remove(struct platform_device *pdev)
		{
		mfd_remove_devices(&pdev->dev);

		return 0;
		}

		static struct of_device_id of_hi6421_pmic_match_tbl[] = {
		{ .compatible = "hisilicon,hi6421-pmic", },
		{ },
		};

		static struct platform_driver hi6421_pmic_driver = {
		.driver = {
		.name = "hi6421_pmic",
		.of_match_table = of_hi6421_pmic_match_tbl,
		},
		.probe = hi6421_pmic_probe,
		.remove = hi6421_pmic_remove,
		};
		module_platform_driver(hi6421_pmic_driver);

		MODULE_AUTHOR("Guodong Xu <guodong.xu@linaro.org>");
		MODULE_DESCRIPTION("Hi6421 PMIC driver");
		MODULE_LICENSE("GPL v2");

include/linux/mfd/hi6421-pmic.h

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		/*
		* Header file for device driver Hi6421 PMIC
		*
		* Copyright (c) <2011-2014> HiSilicon Technologies Co., Ltd.
		* http://www.hisilicon.com
		* Copyright (c) <2013-2014> Linaro Ltd.
		* http://www.linaro.org
		*
		* Author: Guodong Xu <guodong.xu@linaro.org>
		*
		* 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.
		*/

		#ifndef __HI6421_PMIC_H
		#define __HI6421_PMIC_H

		/* Hi6421 registers are mapped to memory bus in 4 bytes stride */
		#define HI6421_REG_TO_BUS_ADDR(x) (x << 2)

		/* Hi6421 maximum register number */
		#define HI6421_REG_MAX 0xFF

		/* Hi6421 OCP (over current protection) and DEB (debounce) control register */
		#define HI6421_OCP_DEB_CTRL_REG HI6421_REG_TO_BUS_ADDR(0x51)
		#define HI6421_OCP_DEB_SEL_MASK 0x0C
		#define HI6421_OCP_DEB_SEL_8MS 0x00
		#define HI6421_OCP_DEB_SEL_16MS 0x04
		#define HI6421_OCP_DEB_SEL_32MS 0x08
		#define HI6421_OCP_DEB_SEL_64MS 0x0C
		#define HI6421_OCP_EN_DEBOUNCE_MASK 0x02
		#define HI6421_OCP_EN_DEBOUNCE_ENABLE 0x02
		#define HI6421_OCP_AUTO_STOP_MASK 0x01
		#define HI6421_OCP_AUTO_STOP_ENABLE 0x01

		struct hi6421_pmic {
		struct regmap *regmap;
		};

		#endif /* __HI6421_PMIC_H */