// 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_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,
};

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");