hwmon/pmbus/xdpe12284.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * Hardware monitoring driver for Infineon Multi-phase Digital VR Controllers
0004  *
0005  * Copyright (c) 2020 Mellanox Technologies. All rights reserved.
0006  */
0007
0008 #include <linux/err.h>
0009 #include <linux/i2c.h>
0010 #include <linux/init.h>
0011 #include <linux/kernel.h>
0012 #include <linux/module.h>
0013 #include <linux/regulator/driver.h>
0014
0015 #include "pmbus.h"
0016
0017 #define XDPE122_PROT_VR12_5MV       0x01 /* VR12.0 mode, 5-mV DAC */
0018 #define XDPE122_PROT_VR12_5_10MV    0x02 /* VR12.5 mode, 10-mV DAC */
0019 #define XDPE122_PROT_IMVP9_10MV     0x03 /* IMVP9 mode, 10-mV DAC */
0020 #define XDPE122_AMD_625MV       0x10 /* AMD mode 6.25mV */
0021 #define XDPE122_PAGE_NUM        2
0022
0023 static int xdpe122_read_word_data(struct i2c_client *client, int page,
0024                   int phase, int reg)
0025 {
0026     const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
0027     long val;
0028     s16 exponent;
0029     s32 mantissa;
0030     int ret;
0031
0032     switch (reg) {
0033     case PMBUS_VOUT_OV_FAULT_LIMIT:
0034     case PMBUS_VOUT_UV_FAULT_LIMIT:
0035         ret = pmbus_read_word_data(client, page, phase, reg);
0036         if (ret < 0)
0037             return ret;
0038
0039         /* Convert register value to LINEAR11 data. */
0040         exponent = ((s16)ret) >> 11;
0041         mantissa = ((s16)((ret & GENMASK(10, 0)) << 5)) >> 5;
0042         val = mantissa * 1000L;
0043         if (exponent >= 0)
0044             val <<= exponent;
0045         else
0046             val >>= -exponent;
0047
0048         /* Convert data to VID register. */
0049         switch (info->vrm_version[page]) {
0050         case vr13:
0051             if (val >= 500)
0052                 return 1 + DIV_ROUND_CLOSEST(val - 500, 10);
0053             return 0;
0054         case vr12:
0055             if (val >= 250)
0056                 return 1 + DIV_ROUND_CLOSEST(val - 250, 5);
0057             return 0;
0058         case imvp9:
0059             if (val >= 200)
0060                 return 1 + DIV_ROUND_CLOSEST(val - 200, 10);
0061             return 0;
0062         case amd625mv:
0063             if (val >= 200 && val <= 1550)
0064                 return DIV_ROUND_CLOSEST((1550 - val) * 100,
0065                              625);
0066             return 0;
0067         default:
0068             return -EINVAL;
0069         }
0070     default:
0071         return -ENODATA;
0072     }
0073
0074     return 0;
0075 }
0076
0077 static int xdpe122_identify(struct i2c_client *client,
0078                 struct pmbus_driver_info *info)
0079 {
0080     u8 vout_params;
0081     int i, ret, vout_mode;
0082
0083     vout_mode = pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE);
0084     if (vout_mode >= 0 && vout_mode != 0xff) {
0085         switch (vout_mode >> 5) {
0086         case 0:
0087             info->format[PSC_VOLTAGE_OUT] = linear;
0088             return 0;
0089         case 1:
0090             info->format[PSC_VOLTAGE_OUT] = vid;
0091             info->read_word_data = xdpe122_read_word_data;
0092             break;
0093         default:
0094             return -ENODEV;
0095         }
0096     }
0097
0098     for (i = 0; i < XDPE122_PAGE_NUM; i++) {
0099         /* Read the register with VOUT scaling value.*/
0100         ret = pmbus_read_byte_data(client, i, PMBUS_VOUT_MODE);
0101         if (ret < 0)
0102             return ret;
0103
0104         vout_params = ret & GENMASK(4, 0);
0105
0106         switch (vout_params) {
0107         case XDPE122_PROT_VR12_5_10MV:
0108             info->vrm_version[i] = vr13;
0109             break;
0110         case XDPE122_PROT_VR12_5MV:
0111             info->vrm_version[i] = vr12;
0112             break;
0113         case XDPE122_PROT_IMVP9_10MV:
0114             info->vrm_version[i] = imvp9;
0115             break;
0116         case XDPE122_AMD_625MV:
0117             info->vrm_version[i] = amd625mv;
0118             break;
0119         default:
0120             return -EINVAL;
0121         }
0122     }
0123
0124     return 0;
0125 }
0126
0127 static const struct regulator_desc __maybe_unused xdpe122_reg_desc[] = {
0128     PMBUS_REGULATOR("vout", 0),
0129     PMBUS_REGULATOR("vout", 1),
0130 };
0131
0132 static struct pmbus_driver_info xdpe122_info = {
0133     .pages = XDPE122_PAGE_NUM,
0134     .format[PSC_VOLTAGE_IN] = linear,
0135     .format[PSC_TEMPERATURE] = linear,
0136     .format[PSC_CURRENT_IN] = linear,
0137     .format[PSC_CURRENT_OUT] = linear,
0138     .format[PSC_POWER] = linear,
0139     .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
0140         PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
0141         PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
0142         PMBUS_HAVE_POUT | PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT,
0143     .func[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
0144         PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
0145         PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
0146         PMBUS_HAVE_POUT | PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT,
0147     .identify = xdpe122_identify,
0148 #if IS_ENABLED(CONFIG_SENSORS_XDPE122_REGULATOR)
0149     .num_regulators = 2,
0150     .reg_desc = xdpe122_reg_desc,
0151 #endif
0152 };
0153
0154 static int xdpe122_probe(struct i2c_client *client)
0155 {
0156     struct pmbus_driver_info *info;
0157
0158     info = devm_kmemdup(&client->dev, &xdpe122_info, sizeof(*info),
0159                 GFP_KERNEL);
0160     if (!info)
0161         return -ENOMEM;
0162
0163     return pmbus_do_probe(client, info);
0164 }
0165
0166 static const struct i2c_device_id xdpe122_id[] = {
0167     {"xdpe11280", 0},
0168     {"xdpe12254", 0},
0169     {"xdpe12284", 0},
0170     {}
0171 };
0172
0173 MODULE_DEVICE_TABLE(i2c, xdpe122_id);
0174
0175 static const struct of_device_id __maybe_unused xdpe122_of_match[] = {
0176     {.compatible = "infineon,xdpe11280"},
0177     {.compatible = "infineon,xdpe12254"},
0178     {.compatible = "infineon,xdpe12284"},
0179     {}
0180 };
0181 MODULE_DEVICE_TABLE(of, xdpe122_of_match);
0182
0183 static struct i2c_driver xdpe122_driver = {
0184     .driver = {
0185         .name = "xdpe12284",
0186         .of_match_table = of_match_ptr(xdpe122_of_match),
0187     },
0188     .probe_new = xdpe122_probe,
0189     .id_table = xdpe122_id,
0190 };
0191
0192 module_i2c_driver(xdpe122_driver);
0193
0194 MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");
0195 MODULE_DESCRIPTION("PMBus driver for Infineon XDPE122 family");
0196 MODULE_LICENSE("GPL");
0197 MODULE_IMPORT_NS(PMBUS);