// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Hardware monitoring driver for Infineon Multi-phase Digital VR Controllers
 *
 * Copyright (c) 2020 Mellanox Technologies. All rights reserved.
 */

#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include "pmbus.h"

#define XDPE122_PROT_VR12_5MV		0x01 /* VR12.0 mode, 5-mV DAC */
#define XDPE122_PROT_VR12_5_10MV	0x02 /* VR12.5 mode, 10-mV DAC */
#define XDPE122_PROT_IMVP9_10MV		0x03 /* IMVP9 mode, 10-mV DAC */
#define XDPE122_AMD_625MV		0x10 /* AMD mode 6.25mV */
#define XDPE122_PAGE_NUM		2

static int xdpe122_read_word_data(struct i2c_client *client, int page, int reg)
{
	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
	long val;
	s16 exponent;
	s32 mantissa;
	int ret;

	switch (reg) {
	case PMBUS_VOUT_OV_FAULT_LIMIT:
	case PMBUS_VOUT_UV_FAULT_LIMIT:
		ret = pmbus_read_word_data(client, page, reg);
		if (ret < 0)
			return ret;

		/* Convert register value to LINEAR11 data. */
		exponent = ((s16)ret) >> 11;
		mantissa = ((s16)((ret & GENMASK(10, 0)) << 5)) >> 5;
		val = mantissa * 1000L;
		if (exponent >= 0)
			val <<= exponent;
		else
			val >>= -exponent;

		/* Convert data to VID register. */
		switch (info->vrm_version[page]) {
		case vr13:
			if (val >= 500)
				return 1 + DIV_ROUND_CLOSEST(val - 500, 10);
			return 0;
		case vr12:
			if (val >= 250)
				return 1 + DIV_ROUND_CLOSEST(val - 250, 5);
			return 0;
		case imvp9:
			if (val >= 200)
				return 1 + DIV_ROUND_CLOSEST(val - 200, 10);
			return 0;
		case amd625mv:
			if (val >= 200 && val <= 1550)
				return DIV_ROUND_CLOSEST((1550 - val) * 100,
							 625);
			return 0;
		default:
			return -EINVAL;
		}
	default:
		return -ENODATA;
	}

	return 0;
}

static int xdpe122_identify(struct i2c_client *client,
			    struct pmbus_driver_info *info)
{
	u8 vout_params;
	int i, ret;

	for (i = 0; i < XDPE122_PAGE_NUM; i++) {
		/* Read the register with VOUT scaling value.*/
		ret = pmbus_read_byte_data(client, i, PMBUS_VOUT_MODE);
		if (ret < 0)
			return ret;

		vout_params = ret & GENMASK(4, 0);

		switch (vout_params) {
		case XDPE122_PROT_VR12_5_10MV:
			info->vrm_version[i] = vr13;
			break;
		case XDPE122_PROT_VR12_5MV:
			info->vrm_version[i] = vr12;
			break;
		case XDPE122_PROT_IMVP9_10MV:
			info->vrm_version[i] = imvp9;
			break;
		case XDPE122_AMD_625MV:
			info->vrm_version[i] = amd625mv;
			break;
		default:
			return -EINVAL;
		}
	}

	return 0;
}

static struct pmbus_driver_info xdpe122_info = {
	.pages = XDPE122_PAGE_NUM,
	.format[PSC_VOLTAGE_IN] = linear,
	.format[PSC_VOLTAGE_OUT] = vid,
	.format[PSC_TEMPERATURE] = linear,
	.format[PSC_CURRENT_IN] = linear,
	.format[PSC_CURRENT_OUT] = linear,
	.format[PSC_POWER] = linear,
	.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
		PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
		PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
		PMBUS_HAVE_POUT | PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT,
	.func[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
		PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
		PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
		PMBUS_HAVE_POUT | PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT,
	.identify = xdpe122_identify,
	.read_word_data = xdpe122_read_word_data,
};

static int xdpe122_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct pmbus_driver_info *info;

	info = devm_kmemdup(&client->dev, &xdpe122_info, sizeof(*info),
			    GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	return pmbus_do_probe(client, id, info);
}

static const struct i2c_device_id xdpe122_id[] = {
	{"xdpe12254", 0},
	{"xdpe12284", 0},
	{}
};

MODULE_DEVICE_TABLE(i2c, xdpe122_id);

static const struct of_device_id __maybe_unused xdpe122_of_match[] = {
	{.compatible = "infineon,xdpe12254"},
	{.compatible = "infineon,xdpe12284"},
	{}
};
MODULE_DEVICE_TABLE(of, xdpe122_of_match);

static struct i2c_driver xdpe122_driver = {
	.driver = {
		.name = "xdpe12284",
		.of_match_table = of_match_ptr(xdpe122_of_match),
	},
	.probe = xdpe122_probe,
	.remove = pmbus_do_remove,
	.id_table = xdpe122_id,
};

module_i2c_driver(xdpe122_driver);

MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");
MODULE_DESCRIPTION("PMBus driver for Infineon XDPE122 family");
MODULE_LICENSE("GPL");