xref: /openbmc/linux/drivers/hwmon/pmbus/tps53679.c (revision 63eb4587)

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Hardware monitoring driver for Texas Instruments TPS53679
 *
 * Copyright (c) 2017 Mellanox Technologies. All rights reserved.
 * Copyright (c) 2017 Vadim Pasternak <vadimp@mellanox.com>
 */

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

enum chips {
	tps53679, tps53688,
};

#define TPS53679_PROT_VR12_5MV		0x01 /* VR12.0 mode, 5-mV DAC */
#define TPS53679_PROT_VR12_5_10MV	0x02 /* VR12.5 mode, 10-mV DAC */
#define TPS53679_PROT_VR13_10MV		0x04 /* VR13.0 mode, 10-mV DAC */
#define TPS53679_PROT_IMVP8_5MV		0x05 /* IMVP8 mode, 5-mV DAC */
#define TPS53679_PROT_VR13_5MV		0x07 /* VR13.0 mode, 5-mV DAC */
#define TPS53679_PAGE_NUM		2

static int tps53679_identify(struct i2c_client *client,
			     struct pmbus_driver_info *info)
{
	u8 vout_params;
	int i, ret;

	for (i = 0; i < TPS53679_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 TPS53679_PROT_VR13_10MV:
		case TPS53679_PROT_VR12_5_10MV:
			info->vrm_version[i] = vr13;
			break;
		case TPS53679_PROT_VR13_5MV:
		case TPS53679_PROT_VR12_5MV:
		case TPS53679_PROT_IMVP8_5MV:
			info->vrm_version[i] = vr12;
			break;
		default:
			return -EINVAL;
		}
	}

	return 0;
}

static struct pmbus_driver_info tps53679_info = {
	.format[PSC_VOLTAGE_IN] = linear,
	.format[PSC_VOLTAGE_OUT] = vid,
	.format[PSC_TEMPERATURE] = linear,
	.format[PSC_CURRENT_OUT] = linear,
	.format[PSC_POWER] = linear,
	.func[0] = PMBUS_HAVE_VIN |
		PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
		PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
		PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
		PMBUS_HAVE_POUT,
	.func[1] = PMBUS_HAVE_VIN |
		PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
		PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
		PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
		PMBUS_HAVE_POUT,
};

static int tps53679_probe(struct i2c_client *client,
			  const struct i2c_device_id *id)
{
	struct device *dev = &client->dev;
	struct pmbus_driver_info *info;
	enum chips chip_id;

	if (dev->of_node)
		chip_id = (enum chips)of_device_get_match_data(dev);
	else
		chip_id = id->driver_data;

	info = devm_kmemdup(dev, &tps53679_info, sizeof(*info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	switch (chip_id) {
	case tps53679:
	case tps53688:
		info->pages = TPS53679_PAGE_NUM;
		info->identify = tps53679_identify;
		break;
	default:
		return -ENODEV;
	}

	return pmbus_do_probe(client, id, info);
}

static const struct i2c_device_id tps53679_id[] = {
	{"tps53679", tps53679},
	{"tps53688", tps53688},
	{}
};

MODULE_DEVICE_TABLE(i2c, tps53679_id);

static const struct of_device_id __maybe_unused tps53679_of_match[] = {
	{.compatible = "ti,tps53679", .data = (void *)tps53679},
	{.compatible = "ti,tps53688", .data = (void *)tps53688},
	{}
};
MODULE_DEVICE_TABLE(of, tps53679_of_match);

static struct i2c_driver tps53679_driver = {
	.driver = {
		.name = "tps53679",
		.of_match_table = of_match_ptr(tps53679_of_match),
	},
	.probe = tps53679_probe,
	.remove = pmbus_do_remove,
	.id_table = tps53679_id,
};

module_i2c_driver(tps53679_driver);

MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");
MODULE_DESCRIPTION("PMBus driver for Texas Instruments TPS53679");
MODULE_LICENSE("GPL");