1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Hardware monitoring driver for Infineon Multi-phase Digital VR Controllers
5 * Copyright (c) 2020 Mellanox Technologies. All rights reserved.
10 #include <linux/init.h>
11 #include <linux/kernel.h>
12 #include <linux/module.h>
15 #define XDPE122_PROT_VR12_5MV 0x01 /* VR12.0 mode, 5-mV DAC */
16 #define XDPE122_PROT_VR12_5_10MV 0x02 /* VR12.5 mode, 10-mV DAC */
17 #define XDPE122_PROT_IMVP9_10MV 0x03 /* IMVP9 mode, 10-mV DAC */
18 #define XDPE122_AMD_625MV 0x10 /* AMD mode 6.25mV */
19 #define XDPE122_PAGE_NUM 2
21 static int xdpe122_read_word_data(struct i2c_client *client, int page, int reg)
23 const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
30 case PMBUS_VOUT_OV_FAULT_LIMIT:
31 case PMBUS_VOUT_UV_FAULT_LIMIT:
32 ret = pmbus_read_word_data(client, page, reg);
36 /* Convert register value to LINEAR11 data. */
37 exponent = ((s16)ret) >> 11;
38 mantissa = ((s16)((ret & GENMASK(10, 0)) << 5)) >> 5;
39 val = mantissa * 1000L;
45 /* Convert data to VID register. */
46 switch (info->vrm_version[page]) {
49 return 1 + DIV_ROUND_CLOSEST(val - 500, 10);
53 return 1 + DIV_ROUND_CLOSEST(val - 250, 5);
57 return 1 + DIV_ROUND_CLOSEST(val - 200, 10);
60 if (val >= 200 && val <= 1550)
61 return DIV_ROUND_CLOSEST((1550 - val) * 100,
74 static int xdpe122_identify(struct i2c_client *client,
75 struct pmbus_driver_info *info)
80 for (i = 0; i < XDPE122_PAGE_NUM; i++) {
81 /* Read the register with VOUT scaling value.*/
82 ret = pmbus_read_byte_data(client, i, PMBUS_VOUT_MODE);
86 vout_params = ret & GENMASK(4, 0);
88 switch (vout_params) {
89 case XDPE122_PROT_VR12_5_10MV:
90 info->vrm_version[i] = vr13;
92 case XDPE122_PROT_VR12_5MV:
93 info->vrm_version[i] = vr12;
95 case XDPE122_PROT_IMVP9_10MV:
96 info->vrm_version[i] = imvp9;
98 case XDPE122_AMD_625MV:
99 info->vrm_version[i] = amd625mv;
109 static struct pmbus_driver_info xdpe122_info = {
110 .pages = XDPE122_PAGE_NUM,
111 .format[PSC_VOLTAGE_IN] = linear,
112 .format[PSC_VOLTAGE_OUT] = vid,
113 .format[PSC_TEMPERATURE] = linear,
114 .format[PSC_CURRENT_IN] = linear,
115 .format[PSC_CURRENT_OUT] = linear,
116 .format[PSC_POWER] = linear,
117 .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
118 PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
119 PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
120 PMBUS_HAVE_POUT | PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT,
121 .func[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
122 PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
123 PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
124 PMBUS_HAVE_POUT | PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT,
125 .identify = xdpe122_identify,
126 .read_word_data = xdpe122_read_word_data,
129 static int xdpe122_probe(struct i2c_client *client,
130 const struct i2c_device_id *id)
132 struct pmbus_driver_info *info;
134 info = devm_kmemdup(&client->dev, &xdpe122_info, sizeof(*info),
139 return pmbus_do_probe(client, id, info);
142 static const struct i2c_device_id xdpe122_id[] = {
148 MODULE_DEVICE_TABLE(i2c, xdpe122_id);
150 static const struct of_device_id __maybe_unused xdpe122_of_match[] = {
151 {.compatible = "infineon,xdpe12254"},
152 {.compatible = "infineon,xdpe12284"},
155 MODULE_DEVICE_TABLE(of, xdpe122_of_match);
157 static struct i2c_driver xdpe122_driver = {
160 .of_match_table = of_match_ptr(xdpe122_of_match),
162 .probe = xdpe122_probe,
163 .remove = pmbus_do_remove,
164 .id_table = xdpe122_id,
167 module_i2c_driver(xdpe122_driver);
169 MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");
170 MODULE_DESCRIPTION("PMBus driver for Infineon XDPE122 family");
171 MODULE_LICENSE("GPL");