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,
24 const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
31 case PMBUS_VOUT_OV_FAULT_LIMIT:
32 case PMBUS_VOUT_UV_FAULT_LIMIT:
33 ret = pmbus_read_word_data(client, page, phase, reg);
37 /* Convert register value to LINEAR11 data. */
38 exponent = ((s16)ret) >> 11;
39 mantissa = ((s16)((ret & GENMASK(10, 0)) << 5)) >> 5;
40 val = mantissa * 1000L;
46 /* Convert data to VID register. */
47 switch (info->vrm_version[page]) {
50 return 1 + DIV_ROUND_CLOSEST(val - 500, 10);
54 return 1 + DIV_ROUND_CLOSEST(val - 250, 5);
58 return 1 + DIV_ROUND_CLOSEST(val - 200, 10);
61 if (val >= 200 && val <= 1550)
62 return DIV_ROUND_CLOSEST((1550 - val) * 100,
75 static int xdpe122_identify(struct i2c_client *client,
76 struct pmbus_driver_info *info)
81 for (i = 0; i < XDPE122_PAGE_NUM; i++) {
82 /* Read the register with VOUT scaling value.*/
83 ret = pmbus_read_byte_data(client, i, PMBUS_VOUT_MODE);
87 vout_params = ret & GENMASK(4, 0);
89 switch (vout_params) {
90 case XDPE122_PROT_VR12_5_10MV:
91 info->vrm_version[i] = vr13;
93 case XDPE122_PROT_VR12_5MV:
94 info->vrm_version[i] = vr12;
96 case XDPE122_PROT_IMVP9_10MV:
97 info->vrm_version[i] = imvp9;
99 case XDPE122_AMD_625MV:
100 info->vrm_version[i] = amd625mv;
110 static struct pmbus_driver_info xdpe122_info = {
111 .pages = XDPE122_PAGE_NUM,
112 .format[PSC_VOLTAGE_IN] = linear,
113 .format[PSC_VOLTAGE_OUT] = vid,
114 .format[PSC_TEMPERATURE] = linear,
115 .format[PSC_CURRENT_IN] = linear,
116 .format[PSC_CURRENT_OUT] = linear,
117 .format[PSC_POWER] = linear,
118 .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
119 PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
120 PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
121 PMBUS_HAVE_POUT | PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT,
122 .func[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
123 PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
124 PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
125 PMBUS_HAVE_POUT | PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT,
126 .identify = xdpe122_identify,
127 .read_word_data = xdpe122_read_word_data,
130 static int xdpe122_probe(struct i2c_client *client,
131 const struct i2c_device_id *id)
133 struct pmbus_driver_info *info;
135 info = devm_kmemdup(&client->dev, &xdpe122_info, sizeof(*info),
140 return pmbus_do_probe(client, id, info);
143 static const struct i2c_device_id xdpe122_id[] = {
149 MODULE_DEVICE_TABLE(i2c, xdpe122_id);
151 static const struct of_device_id __maybe_unused xdpe122_of_match[] = {
152 {.compatible = "infineon,xdpe12254"},
153 {.compatible = "infineon,xdpe12284"},
156 MODULE_DEVICE_TABLE(of, xdpe122_of_match);
158 static struct i2c_driver xdpe122_driver = {
161 .of_match_table = of_match_ptr(xdpe122_of_match),
163 .probe = xdpe122_probe,
164 .remove = pmbus_do_remove,
165 .id_table = xdpe122_id,
168 module_i2c_driver(xdpe122_driver);
170 MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");
171 MODULE_DESCRIPTION("PMBus driver for Infineon XDPE122 family");
172 MODULE_LICENSE("GPL");