xdpe12284.c

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * Hardware monitoring driver for Infineon Multi-phase Digital VR Controllers
  4 *
  5 * Copyright (c) 2020 Mellanox Technologies. All rights reserved.
  6 */
  7
  8#include <linux/err.h>
  9#include <linux/i2c.h>
 10#include <linux/init.h>
 11#include <linux/kernel.h>
 12#include <linux/module.h>
 13#include <linux/regulator/driver.h>
 14
 15#include "pmbus.h"
 16
 17#define XDPE122_PROT_VR12_5MV		0x01 /* VR12.0 mode, 5-mV DAC */
 18#define XDPE122_PROT_VR12_5_10MV	0x02 /* VR12.5 mode, 10-mV DAC */
 19#define XDPE122_PROT_IMVP9_10MV		0x03 /* IMVP9 mode, 10-mV DAC */
 20#define XDPE122_AMD_625MV		0x10 /* AMD mode 6.25mV */
 21#define XDPE122_PAGE_NUM		2
 22
 23static int xdpe122_read_word_data(struct i2c_client *client, int page,
 24				  int phase, int reg)
 25{
 26	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 27	long val;
 28	s16 exponent;
 29	s32 mantissa;
 30	int ret;
 31
 32	switch (reg) {
 33	case PMBUS_VOUT_OV_FAULT_LIMIT:
 34	case PMBUS_VOUT_UV_FAULT_LIMIT:
 35		ret = pmbus_read_word_data(client, page, phase, reg);
 36		if (ret < 0)
 37			return ret;
 38
 39		/* Convert register value to LINEAR11 data. */
 40		exponent = ((s16)ret) >> 11;
 41		mantissa = ((s16)((ret & GENMASK(10, 0)) << 5)) >> 5;
 42		val = mantissa * 1000L;
 43		if (exponent >= 0)
 44			val <<= exponent;
 45		else
 46			val >>= -exponent;
 47
 48		/* Convert data to VID register. */
 49		switch (info->vrm_version[page]) {
 50		case vr13:
 51			if (val >= 500)
 52				return 1 + DIV_ROUND_CLOSEST(val - 500, 10);
 53			return 0;
 54		case vr12:
 55			if (val >= 250)
 56				return 1 + DIV_ROUND_CLOSEST(val - 250, 5);
 57			return 0;
 58		case imvp9:
 59			if (val >= 200)
 60				return 1 + DIV_ROUND_CLOSEST(val - 200, 10);
 61			return 0;
 62		case amd625mv:
 63			if (val >= 200 && val <= 1550)
 64				return DIV_ROUND_CLOSEST((1550 - val) * 100,
 65							 625);
 66			return 0;
 67		default:
 68			return -EINVAL;
 69		}
 70	default:
 71		return -ENODATA;
 72	}
 73
 74	return 0;
 75}
 76
 77static int xdpe122_identify(struct i2c_client *client,
 78			    struct pmbus_driver_info *info)
 79{
 80	u8 vout_params;
 81	int i, ret, vout_mode;
 82
 83	vout_mode = pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE);
 84	if (vout_mode >= 0 && vout_mode != 0xff) {
 85		switch (vout_mode >> 5) {
 86		case 0:
 87			info->format[PSC_VOLTAGE_OUT] = linear;
 88			return 0;
 89		case 1:
 90			info->format[PSC_VOLTAGE_OUT] = vid;
 91			info->read_word_data = xdpe122_read_word_data;
 92			break;
 93		default:
 94			return -ENODEV;
 95		}
 96	}
 97
 98	for (i = 0; i < XDPE122_PAGE_NUM; i++) {
 99		/* Read the register with VOUT scaling value.*/
100		ret = pmbus_read_byte_data(client, i, PMBUS_VOUT_MODE);
101		if (ret < 0)
102			return ret;
103
104		vout_params = ret & GENMASK(4, 0);
105
106		switch (vout_params) {
107		case XDPE122_PROT_VR12_5_10MV:
108			info->vrm_version[i] = vr13;
109			break;
110		case XDPE122_PROT_VR12_5MV:
111			info->vrm_version[i] = vr12;
112			break;
113		case XDPE122_PROT_IMVP9_10MV:
114			info->vrm_version[i] = imvp9;
115			break;
116		case XDPE122_AMD_625MV:
117			info->vrm_version[i] = amd625mv;
118			break;
119		default:
120			return -EINVAL;
121		}
122	}
123
124	return 0;
125}
126
127static const struct regulator_desc __maybe_unused xdpe122_reg_desc[] = {
128	PMBUS_REGULATOR("vout", 0),
129	PMBUS_REGULATOR("vout", 1),
130};
131
132static struct pmbus_driver_info xdpe122_info = {
133	.pages = XDPE122_PAGE_NUM,
134	.format[PSC_VOLTAGE_IN] = linear,
135	.format[PSC_TEMPERATURE] = linear,
136	.format[PSC_CURRENT_IN] = linear,
137	.format[PSC_CURRENT_OUT] = linear,
138	.format[PSC_POWER] = linear,
139	.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
140		PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
141		PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
142		PMBUS_HAVE_POUT | PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT,
143	.func[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
144		PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
145		PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
146		PMBUS_HAVE_POUT | PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT,
147	.identify = xdpe122_identify,
148#if IS_ENABLED(CONFIG_SENSORS_XDPE122_REGULATOR)
149	.num_regulators = 2,
150	.reg_desc = xdpe122_reg_desc,
151#endif
152};
153
154static int xdpe122_probe(struct i2c_client *client)
155{
156	struct pmbus_driver_info *info;
157
158	info = devm_kmemdup(&client->dev, &xdpe122_info, sizeof(*info),
159			    GFP_KERNEL);
160	if (!info)
161		return -ENOMEM;
162
163	return pmbus_do_probe(client, info);
164}
165
166static const struct i2c_device_id xdpe122_id[] = {
167	{"xdpe11280"},
168	{"xdpe12254"},
169	{"xdpe12284"},
170	{}
171};
172
173MODULE_DEVICE_TABLE(i2c, xdpe122_id);
174
175static const struct of_device_id __maybe_unused xdpe122_of_match[] = {
176	{.compatible = "infineon,xdpe11280"},
177	{.compatible = "infineon,xdpe12254"},
178	{.compatible = "infineon,xdpe12284"},
179	{}
180};
181MODULE_DEVICE_TABLE(of, xdpe122_of_match);
182
183static struct i2c_driver xdpe122_driver = {
184	.driver = {
185		.name = "xdpe12284",
186		.of_match_table = of_match_ptr(xdpe122_of_match),
187	},
188	.probe = xdpe122_probe,
189	.id_table = xdpe122_id,
190};
191
192module_i2c_driver(xdpe122_driver);
193
194MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");
195MODULE_DESCRIPTION("PMBus driver for Infineon XDPE122 family");
196MODULE_LICENSE("GPL");
197MODULE_IMPORT_NS("PMBUS");