/*
 * Copyright (c) 2014 MediaTek Inc.
 * Author: Flora Fu, MediaTek
 *
 * 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/module.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/regmap.h>
#include <linux/mfd/core.h>
#include <linux/mfd/mt6323/core.h>
#include <linux/mfd/mt6358/core.h>
#include <linux/mfd/mt6392/core.h>
#include <linux/mfd/mt6397/core.h>
#include <linux/mfd/mt6323/registers.h>
#include <linux/mfd/mt6358/registers.h>
#include <linux/mfd/mt6392/registers.h>
#include <linux/mfd/mt6397/registers.h>

#define MT6358_RTC_BASE		0x0588
#define MT6358_RTC_SIZE		0x3c
#define MT6358_RTC_WRTGR_OFFSET	0x3a
#define MT6392_RTC_BASE		0x8000
#define MT6392_RTC_SIZE		0x3e
#define MT6397_RTC_BASE		0xe000
#define MT6397_RTC_SIZE		0x3e
#define MT6397_RTC_WRTGR_OFFSET	0x3c

static const struct resource mt6358_rtc_resources[] = {
	{
		.start = MT6358_RTC_BASE,
		.end   = MT6358_RTC_BASE + MT6358_RTC_SIZE,
		.flags = IORESOURCE_MEM,
	},
	{
		.start = MT6358_IRQ_RTC,
		.end   = MT6358_IRQ_RTC,
		.flags = IORESOURCE_IRQ,
	},
	{
		.start = MT6358_RTC_WRTGR_OFFSET,
		.end   = MT6358_RTC_WRTGR_OFFSET,
		.flags = IORESOURCE_REG,
	},
};

static const struct resource mt6392_rtc_resources[] = {
	DEFINE_RES_MEM(MT6392_RTC_BASE, MT6392_RTC_SIZE),
	DEFINE_RES_IRQ(MT6392_IRQ_RTC),
};

static const struct resource mt6397_rtc_resources[] = {
	{
		.start = MT6397_RTC_BASE,
		.end   = MT6397_RTC_BASE + MT6397_RTC_SIZE,
		.flags = IORESOURCE_MEM,
	},
	{
		.start = MT6397_IRQ_RTC,
		.end   = MT6397_IRQ_RTC,
		.flags = IORESOURCE_IRQ,
	},
	{
		.start = MT6397_RTC_WRTGR_OFFSET,
		.end   = MT6397_RTC_WRTGR_OFFSET,
		.flags = IORESOURCE_REG,
	},
};

static const struct resource mt6323_keys_resources[] = {
	DEFINE_RES_IRQ(MT6323_IRQ_STATUS_PWRKEY),
	DEFINE_RES_IRQ(MT6323_IRQ_STATUS_FCHRKEY),
};

static const struct resource mt6392_keys_resources[] = {
	DEFINE_RES_IRQ(MT6392_IRQ_PWRKEY),
	DEFINE_RES_IRQ(MT6392_IRQ_FCHRKEY),
};

static const struct resource mt6397_keys_resources[] = {
	DEFINE_RES_IRQ(MT6397_IRQ_PWRKEY),
	DEFINE_RES_IRQ(MT6397_IRQ_HOMEKEY),
};

static const struct mfd_cell mt6392_devs[] = {
	{
		.name = "mt6392-regulator",
		.of_compatible = "mediatek,mt6392-regulator",
	}, {
		.name = "mt6397-rtc",
		.num_resources = ARRAY_SIZE(mt6392_rtc_resources),
		.resources = mt6392_rtc_resources,
		.of_compatible = "mediatek,mt6392-rtc",
	}, {
		.name = "mtk-pmic-keys",
		.num_resources = ARRAY_SIZE(mt6392_keys_resources),
		.resources = mt6392_keys_resources,
		.of_compatible = "mediatek,mt6392-keys"
	},
};

static const struct mfd_cell mt6323_devs[] = {
	{
		.name = "mt6323-regulator",
		.of_compatible = "mediatek,mt6323-regulator"
	}, {
		.name = "mt6323-led",
		.of_compatible = "mediatek,mt6323-led"
	}, {
		.name = "mtk-pmic-keys",
		.num_resources = ARRAY_SIZE(mt6323_keys_resources),
		.resources = mt6323_keys_resources,
		.of_compatible = "mediatek,mt6323-keys"
	},
};

static const struct mfd_cell mt6358_devs[] = {
	{
		.name = "mt6358-regulator",
		.of_compatible = "mediatek,mt6358-regulator"
	}, {
		.name = "mt6397-rtc",
		.num_resources = ARRAY_SIZE(mt6358_rtc_resources),
		.resources = mt6358_rtc_resources,
		.of_compatible = "mediatek,mt6358-rtc",
	}, {
		.name = "mt6358-sound",
		.of_compatible = "mediatek,mt6358-sound"
	},
};

static const struct mfd_cell mt6397_devs[] = {
	{
		.name = "mt6397-rtc",
		.num_resources = ARRAY_SIZE(mt6397_rtc_resources),
		.resources = mt6397_rtc_resources,
		.of_compatible = "mediatek,mt6397-rtc",
	}, {
		.name = "mt6397-regulator",
		.of_compatible = "mediatek,mt6397-regulator",
	}, {
		.name = "mt6397-codec",
		.of_compatible = "mediatek,mt6397-codec",
	}, {
		.name = "mt6397-clk",
		.of_compatible = "mediatek,mt6397-clk",
	}, {
		.name = "mt6397-pinctrl",
		.of_compatible = "mediatek,mt6397-pinctrl",
	}, {
		.name = "mtk-pmic-keys",
		.num_resources = ARRAY_SIZE(mt6397_keys_resources),
		.resources = mt6397_keys_resources,
		.of_compatible = "mediatek,mt6397-keys"
	}
};

struct chip_data {
	u32 cid_addr;
	u32 cid_shift;
};

static const struct chip_data mt6323_core = {
	.cid_addr = MT6323_CID,
	.cid_shift = 0,
};

static const struct chip_data mt6358_core = {
	.cid_addr = MT6358_SWCID,
	.cid_shift = 8,
};

static const struct chip_data mt6392_core = {
	.cid_addr = MT6392_CID,
	.cid_shift = 0,
};

static const struct chip_data mt6397_core = {
	.cid_addr = MT6397_CID,
	.cid_shift = 0,
};

static int mt6397_probe(struct platform_device *pdev)
{
	int ret;
	unsigned int id;
	struct mt6397_chip *pmic;
	const struct chip_data *pmic_core;

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

	pmic->dev = &pdev->dev;

	/*
	 * mt6397 MFD is child device of soc pmic wrapper.
	 * Regmap is set from its parent.
	 */
	pmic->regmap = dev_get_regmap(pdev->dev.parent, NULL);
	if (!pmic->regmap)
		return -ENODEV;

	pmic_core = of_device_get_match_data(&pdev->dev);
	if (!pmic_core)
		return -ENODEV;

	ret = regmap_read(pmic->regmap, pmic_core->cid_addr, &id);
	if (ret) {
		dev_err(&pdev->dev, "Failed to read chip id: %d\n", ret);
		return ret;
	}

	pmic->chip_id = (id >> pmic_core->cid_shift) & 0xff;

	platform_set_drvdata(pdev, pmic);

	pmic->irq = platform_get_irq(pdev, 0);
	if (pmic->irq <= 0)
		return pmic->irq;

	if (pmic->chip_id == MT6358_CHIP_ID)
		ret = mt6358_irq_init(pmic);
	else
		ret = mt6397_irq_init(pmic);

	if (ret)
		return ret;

	switch (pmic->chip_id) {
	case MT6323_CHIP_ID:
		ret = devm_mfd_add_devices(&pdev->dev, -1, mt6323_devs,
					   ARRAY_SIZE(mt6323_devs), NULL,
					   0, pmic->irq_domain);
		break;

	case MT6358_CHIP_ID:
		ret = devm_mfd_add_devices(&pdev->dev, -1, mt6358_devs,
					   ARRAY_SIZE(mt6358_devs), NULL,
					   0, pmic->irq_domain);
		break;

	case MT6391_CHIP_ID:
	case MT6397_CHIP_ID:
		ret = devm_mfd_add_devices(&pdev->dev, -1, mt6397_devs,
					   ARRAY_SIZE(mt6397_devs), NULL,
					   0, pmic->irq_domain);
		break;

	case MT6392_CHIP_ID:
		ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
					   mt6392_devs, ARRAY_SIZE(mt6392_devs),
					   NULL, 0, pmic->irq_domain);
		break;

	default:
		dev_err(&pdev->dev, "unsupported chip: %d\n", pmic->chip_id);
		return -ENODEV;
	}

	if (ret) {
		irq_domain_remove(pmic->irq_domain);
		dev_err(&pdev->dev, "failed to add child devices: %d\n", ret);
	}

	return ret;
}

static const struct of_device_id mt6397_of_match[] = {
	{
		.compatible = "mediatek,mt6323",
		.data = &mt6323_core,
	}, {
		.compatible = "mediatek,mt6358",
		.data = &mt6358_core,
	}, {
		.compatible = "mediatek,mt6392",
		.data = &mt6392_core,
	}, {
		.compatible = "mediatek,mt6397",
		.data = &mt6397_core,
	}, {
		/* sentinel */
	}
};
MODULE_DEVICE_TABLE(of, mt6397_of_match);

static const struct platform_device_id mt6397_id[] = {
	{ "mt6397", 0 },
	{ },
};
MODULE_DEVICE_TABLE(platform, mt6397_id);

static struct platform_driver mt6397_driver = {
	.probe = mt6397_probe,
	.driver = {
		.name = "mt6397",
		.of_match_table = of_match_ptr(mt6397_of_match),
	},
	.id_table = mt6397_id,
};

module_platform_driver(mt6397_driver);

MODULE_AUTHOR("Flora Fu, MediaTek");
MODULE_DESCRIPTION("Driver for MediaTek MT6397 PMIC");
MODULE_LICENSE("GPL");