/*
 * drivers/power/axp/axp803/axp803.c
 * (C) Copyright 2010-2016
 * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
 * Pannan <pannan@allwinnertech.com>
 *
 * driver of axp803
 *
 * 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.
 */

#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/reboot.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/mfd/core.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/of_device.h>
#include <linux/err.h>
#include <linux/power/aw_pm.h>
#include "../axp-core.h"
#include "../axp-charger.h"
#include "../axp-regulator.h"
#include "axp803.h"
#include "axp803-regulator.h"

static struct axp_dev *axp803_pm_power;
struct axp_config_info axp803_config;
struct wakeup_source *axp803_ws;
static int axp803_pmu_num;

static const struct axp_compatible_name_mapping axp803_cn_mapping[] = {
	{
		.device_name = "axp803",
		.mfd_name = {
			.powerkey_name  = "axp803-powerkey",
			.charger_name   = "axp803-charger",
			.regulator_name = "axp803-regulator",
			.gpio_name      = "axp803-gpio",
		},
	},
};

static struct axp_regmap_irq_chip axp803_regmap_irq_chip = {
	.name           = "axp803_irq_chip",
	.status_base    = AXP803_INTSTS1,
	.enable_base    = AXP803_INTEN1,
	.num_regs       = 6,
};

static struct resource axp803_pek_resources[] = {
	{AXP803_IRQ_PEKRE,  AXP803_IRQ_PEKRE,  "PEK_DBR",      IORESOURCE_IRQ,},
	{AXP803_IRQ_PEKFE,  AXP803_IRQ_PEKFE,  "PEK_DBF",      IORESOURCE_IRQ,},
};

static struct resource axp803_charger_resources[] = {
	{AXP803_IRQ_USBIN,     AXP803_IRQ_USBIN,     "usb in",              IORESOURCE_IRQ,},
	{AXP803_IRQ_USBRE,     AXP803_IRQ_USBRE,     "usb out",             IORESOURCE_IRQ,},
	{AXP803_IRQ_ACIN,      AXP803_IRQ_ACIN,      "ac in",               IORESOURCE_IRQ,},
	{AXP803_IRQ_ACRE,      AXP803_IRQ_ACRE,      "ac out",              IORESOURCE_IRQ,},
	{AXP803_IRQ_BATIN,     AXP803_IRQ_BATIN,     "bat in",              IORESOURCE_IRQ,},
	{AXP803_IRQ_BATRE,     AXP803_IRQ_BATRE,     "bat out",             IORESOURCE_IRQ,},
	{AXP803_IRQ_BATINWORK, AXP803_IRQ_BATINWORK, "bat untemp work",     IORESOURCE_IRQ,},
	{AXP803_IRQ_BATOVWORK, AXP803_IRQ_BATOVWORK, "bat ovtemp work",     IORESOURCE_IRQ,},
	{AXP803_IRQ_QBATINCHG, AXP803_IRQ_QBATINCHG, "quit bat untemp chg", IORESOURCE_IRQ,},
	{AXP803_IRQ_BATINCHG,  AXP803_IRQ_BATINCHG,  "bat untemp chg",      IORESOURCE_IRQ,},
	{AXP803_IRQ_QBATOVCHG, AXP803_IRQ_QBATOVCHG, "quit bat ovtemp chg", IORESOURCE_IRQ,},
	{AXP803_IRQ_BATOVCHG,  AXP803_IRQ_BATOVCHG,  "bat ovtemp chg",      IORESOURCE_IRQ,},
	{AXP803_IRQ_CHAST,     AXP803_IRQ_CHAST,     "charging",            IORESOURCE_IRQ,},
	{AXP803_IRQ_CHAOV,     AXP803_IRQ_CHAOV,     "charge over",         IORESOURCE_IRQ,},
	{AXP803_IRQ_LOWN1,     AXP803_IRQ_LOWN1,     "low warning1",        IORESOURCE_IRQ,},
	{AXP803_IRQ_LOWN2,     AXP803_IRQ_LOWN2,     "low warning2",        IORESOURCE_IRQ,},
};

static struct resource axp803_gpio_resources[] = {
	{AXP803_IRQ_GPIO0,  AXP803_IRQ_GPIO0,  "gpio0",        IORESOURCE_IRQ,},
	{AXP803_IRQ_GPIO1,  AXP803_IRQ_GPIO1,  "gpio1",        IORESOURCE_IRQ,},
};

static struct mfd_cell axp803_cells[] = {
	{
		.name          = "axp803-powerkey",
		.num_resources = ARRAY_SIZE(axp803_pek_resources),
		.resources     = axp803_pek_resources,
	},
	{
		.name          = "axp803-regulator",
	},
	{
		.name          = "axp803-charger",
		.num_resources = ARRAY_SIZE(axp803_charger_resources),
		.resources     = axp803_charger_resources,
	},
	{
		.name          = "axp803-gpio",
		.num_resources = ARRAY_SIZE(axp803_gpio_resources),
		.resources     = axp803_gpio_resources,
	},
};

void axp803_power_off(void)
{
	uint8_t val;

	pr_info("[axp] send power-off command!\n");
	mdelay(20);

	if (axp803_config.power_start != 1) {
		axp_regmap_read(axp803_pm_power->regmap, AXP803_STATUS, &val);
		if (val & 0xF0) {
			axp_regmap_read(axp803_pm_power->regmap,
					AXP803_MODE_CHGSTATUS, &val);
			if ((axp803_config.pmu_bat_unused == 0)
				&& (val & 0x20)
				&& (val & 0x10)) {
				pr_info("[axp] set flag!\n");
				axp_regmap_read(axp803_pm_power->regmap,
					AXP803_BUFFERC, &val);
				if (0x0d != val)
					axp_regmap_write(axp803_pm_power->regmap,
						AXP803_BUFFERC, 0x0f);

				mdelay(20);
				pr_info("[axp] reboot!\n");
				machine_restart(NULL);
				pr_warn("[axp] warning!!! arch can't reboot,\"\
					\" maybe some error happened!\n");
			}
		}
	}

	axp_regmap_read(axp803_pm_power->regmap, AXP803_BUFFERC, &val);
	if (val != 0x0d)
		axp_regmap_write(axp803_pm_power->regmap, AXP803_BUFFERC, 0x00);
	mdelay(20);

	axp_regmap_set_bits(axp803_pm_power->regmap, AXP803_OFF_CTL, 0x80);
	mdelay(20);

	pr_warn("[axp] warning!!! arch can't reboot,\"\
		\" maybe some error happened!\n");
}

static int axp803_init_chip(struct axp_dev *axp803)
{
	uint8_t chip_id, dcdc2_ctl;
	int err;

	err = axp_regmap_read(axp803->regmap, AXP803_IC_TYPE, &chip_id);
	if (err) {
		pr_err("[%s] try to read chip id failed!\n",
				axp_name[axp803_pmu_num]);
		return err;
	}

	if (((chip_id & 0xc0) == 0x40) && ((chip_id & 0x0f) == 0x01))
		pr_info("[%s] chip id detect 0x%x !\n",
				axp_name[axp803_pmu_num], chip_id);
	else
		pr_info("[%s] chip id not detect 0x%x !\n",
				axp_name[axp803_pmu_num], chip_id);

	/* enable dcdc2 dvm */
	err = axp_regmap_read(axp803->regmap, AXP803_DCDC_DVM_CTL, &dcdc2_ctl);
	if (err) {
		pr_err("[%s] try to read dcdc dvm failed!\n",
				axp_name[axp803_pmu_num]);
		return err;
	}

	dcdc2_ctl |= (0x1<<2);
	err = axp_regmap_write(axp803->regmap, AXP803_DCDC_DVM_CTL, dcdc2_ctl);
	if (err) {
		pr_err("[%s] try to enable dcdc2 dvm failed!\n",
				axp_name[axp803_pmu_num]);
		return err;
	}
	pr_info("[%s] enable dcdc2 dvm.\n", axp_name[axp803_pmu_num]);

	/* init N_VBUSEN status */
	if (axp803_config.pmu_vbusen_func)
		axp_regmap_set_bits(axp803->regmap, AXP803_HOTOVER_CTL, 0x10);
	else
		axp_regmap_clr_bits(axp803->regmap, AXP803_HOTOVER_CTL, 0x10);

	/* init 16's reset pmu en */
	if (axp803_config.pmu_reset)
		axp_regmap_set_bits(axp803->regmap, AXP803_HOTOVER_CTL, 0x08);
	else
		axp_regmap_clr_bits(axp803->regmap, AXP803_HOTOVER_CTL, 0x08);

	/* init irq wakeup en */
	if (axp803_config.pmu_irq_wakeup)
		axp_regmap_set_bits(axp803->regmap, AXP803_HOTOVER_CTL, 0x80);
	else
		axp_regmap_clr_bits(axp803->regmap, AXP803_HOTOVER_CTL, 0x80);

	/* init pmu over temperature protection */
	if (axp803_config.pmu_hot_shutdown)
		axp_regmap_set_bits(axp803->regmap, AXP803_HOTOVER_CTL, 0x04);
	else
		axp_regmap_clr_bits(axp803->regmap, AXP803_HOTOVER_CTL, 0x04);

	/* init inshort status */
	if (axp803_config.pmu_inshort)
		axp_regmap_set_bits(axp803->regmap, AXP803_HOTOVER_CTL, 0x60);
	else
		axp_regmap_clr_bits(axp803->regmap, AXP803_HOTOVER_CTL, 0x60);

	return 0;
}

static void axp803_wakeup_event(void)
{
	__pm_wakeup_event(axp803_ws, 0);
}

static s32 axp803_usb_det(void)
{
	u8 value = 0;
	int ret = 0;

	axp_regmap_read(axp803_pm_power->regmap, AXP803_STATUS, &value);

	if (value & 0x10) {
		axp_usb_connect = 1;
		ret = 1;
	}

	return ret;
}

static s32 axp803_usb_vbus_output(int high)
{
	u8 ret = 0;

	ret = axp_regmap_clr_bits_sync(axp803_pm_power->regmap,
				AXP803_HOTOVER_CTL, 0x10);
	if (ret)
		return ret;

	if (high)
		ret = axp_regmap_set_bits_sync(axp803_pm_power->regmap,
					AXP803_IPS_SET, 0x04);
	else
		ret = axp_regmap_clr_bits_sync(axp803_pm_power->regmap,
					AXP803_IPS_SET, 0x04);

	return ret;
}

static int axp803_cfg_pmux_para(int num, struct aw_pm_info *api, int *pmu_id)
{
	char name[8];
	struct device_node *np;

	sprintf(name, "pmu%d", num);

	np = of_find_node_by_type(NULL, name);
	if (np == NULL) {
		pr_err("can not find device_type for %s\n", name);
		return -1;
	}

	if (!of_device_is_available(np)) {
		pr_err("can not find node for %s\n", name);
		return -1;
	}

#ifdef CONFIG_AXP_TWI_USED
	if (api != NULL) {
		api->pmu_arg.twi_port = axp803_pm_power->regmap->client->adapter->nr;
		api->pmu_arg.dev_addr = axp803_pm_power->regmap->client->addr;
	}
#endif
	*pmu_id = axp803_config.pmu_id;

	return 0;
}

static const char *axp803_get_pmu_name(void)
{
	return axp_name[axp803_pmu_num];
}

static struct axp_dev *axp803_get_pmu_dev(void)
{
	return axp803_pm_power;
}

struct axp_platform_ops axp803_platform_ops = {
	.usb_det = axp803_usb_det,
	.usb_vbus_output = axp803_usb_vbus_output,
	.cfg_pmux_para = axp803_cfg_pmux_para,
	.get_pmu_name = axp803_get_pmu_name,
	.get_pmu_dev  = axp803_get_pmu_dev,
};

static const struct of_device_id axp803_dt_ids[] = {
	{ .compatible = "axp803", },
	{ .compatible = "axp288", },
	{},
};
MODULE_DEVICE_TABLE(of, axp803_dt_ids);

#ifdef CONFIG_AXP_TWI_USED
static int axp803_probe(struct i2c_client *client,
				const struct i2c_device_id *id)
#else
static int axp803_probe(struct platform_device *pdev)
#endif
{
	int ret;
	struct axp_dev *axp803;
	struct device_node *node;
	struct device *device;

#ifdef CONFIG_AXP_TWI_USED
	node = client->dev.of_node;
	device = &client->dev;
#else
	node = pdev->dev.of_node;
	device = &pdev->dev;
#endif

	axp803_pmu_num = axp_get_pmu_num(axp803_cn_mapping,
				ARRAY_SIZE(axp803_cn_mapping));
	if (axp803_pmu_num < 0) {
		pr_err("%s get pmu num failed\n", __func__);
		return axp803_pmu_num;
	}

	if (node) {
		/* get dt and sysconfig */
		if (!of_device_is_available(node)) {
			axp803_config.pmu_used = 0;
			pr_err("%s: pmu_used = %u\n", __func__,
					axp803_config.pmu_used);
			return -EPERM;
		} else {
			axp803_config.pmu_used = 1;
			ret = axp_dt_parse(node, axp803_pmu_num,
				&axp803_config);
			if (ret) {
				pr_err("%s parse device tree err\n", __func__);
				return -EINVAL;
			}
		}
	} else {
		pr_err("axp803x device tree err!\n");
		return -EBUSY;
	}

	axp803 = devm_kzalloc(device, sizeof(*axp803), GFP_KERNEL);
	if (!axp803)
		return -ENOMEM;

	axp803->dev = device;
	axp803->nr_cells = ARRAY_SIZE(axp803_cells);
	axp803->cells = axp803_cells;
	axp803->pmu_num = axp803_pmu_num;

	ret = axp_mfd_cell_name_init(axp803_cn_mapping,
				ARRAY_SIZE(axp803_cn_mapping), axp803->pmu_num,
				axp803->nr_cells, axp803->cells);
	if (ret)
		return ret;

#ifdef CONFIG_AXP_TWI_USED
	axp803->regmap = axp_regmap_init_i2c(device);
#else
	axp803->regmap = axp_regmap_init_arisc_rsb(device, AXP803_RSB_RTSADDR);
#endif
	if (IS_ERR(axp803->regmap)) {
		ret = PTR_ERR(axp803->regmap);
		dev_err(device, "regmap init failed: %d\n", ret);
		return ret;
	}

#ifdef CONFIG_AXP_TWI_USED
	i2c_set_clientdata(client, axp803);
#else
	platform_set_drvdata(pdev, axp803);
#endif
	ret = axp803_init_chip(axp803);
	if (ret)
		return ret;

	axp803_pm_power = axp803;

	axp_platform_ops_set(axp803->pmu_num, &axp803_platform_ops);

	ret = axp_mfd_add_devices(axp803);
	if (ret) {
		dev_err(axp803->dev, "failed to add MFD devices: %d\n", ret);
		return ret;
	}

#ifdef CONFIG_AXP_TWI_USED
	axp803->irq = client->irq;
#else
	axp803->irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
#endif
	axp803->irq_data = axp_irq_chip_register(axp803->regmap, axp803->irq,
						IRQF_SHARED
						| IRQF_NO_SUSPEND,
						&axp803_regmap_irq_chip,
						axp803_wakeup_event);
	if (IS_ERR(axp803->irq_data)) {
		ret = PTR_ERR(axp803->irq_data);
		dev_err(device, "axp init irq failed: %d\n", ret);
		return ret;
	}

	if (!pm_power_off)
		pm_power_off = axp803_power_off;

	axp803_ws = wakeup_source_register("axp803_wakeup_source");

	return 0;
}

#ifdef CONFIG_AXP_TWI_USED
static int axp803_remove(struct i2c_client *client)
#else
static int axp803_remove(struct platform_device *pdev)
#endif
{
	struct axp_dev *axp803;

#ifdef CONFIG_AXP_TWI_USED
	axp803 = i2c_get_clientdata(client);
#else
	axp803 = platform_get_drvdata(pdev);
#endif

	if (axp803 == axp803_pm_power) {
		axp803_pm_power = NULL;
		pm_power_off = NULL;
	}

	axp_mfd_remove_devices(axp803);
	axp_irq_chip_unregister(axp803->irq, axp803->irq_data);

	return 0;
}

static const struct i2c_device_id axp803_id_table[] = {
	{ "axp803", 0 },
	{ "axp288", 0 },
	{}
};

#ifdef CONFIG_AXP_TWI_USED
static struct i2c_driver axp803_driver = {
#else
static struct platform_driver axp803_driver = {
#endif
	.driver = {
		.name   = "axp803",
		.owner  = THIS_MODULE,
		.of_match_table = axp803_dt_ids,
	},
	.probe      = axp803_probe,
	.remove     = axp803_remove,
#ifdef CONFIG_AXP_TWI_USED
	.id_table   = axp803_id_table,
#endif
};

static int __init axp803_init(void)
{
	int ret;

#ifdef CONFIG_AXP_TWI_USED
	ret = i2c_add_driver(&axp803_driver);
#else
	ret = platform_driver_register(&axp803_driver);
#endif
	if (ret != 0)
		pr_err("Failed to register axp803x driver: %d\n", ret);

	return ret;
}
subsys_initcall_sync(axp803_init);

static void __exit axp803_exit(void)
{
#ifdef CONFIG_AXP_TWI_USED
	i2c_del_driver(&axp803_driver);
#else
	platform_driver_unregister(&axp803_driver);
#endif
}
module_exit(axp803_exit);

MODULE_DESCRIPTION("Driver of AXP803");
MODULE_AUTHOR("pannan");
MODULE_LICENSE("GPL");