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 "pmbus.h" 14 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 20 21 static int xdpe122_identify(struct i2c_client *client, 22 struct pmbus_driver_info *info) 23 { 24 u8 vout_params; 25 int i, ret; 26 27 for (i = 0; i < XDPE122_PAGE_NUM; i++) { 28 /* Read the register with VOUT scaling value.*/ 29 ret = pmbus_read_byte_data(client, i, PMBUS_VOUT_MODE); 30 if (ret < 0) 31 return ret; 32 33 vout_params = ret & GENMASK(4, 0); 34 35 switch (vout_params) { 36 case XDPE122_PROT_VR12_5_10MV: 37 info->vrm_version[i] = vr13; 38 break; 39 case XDPE122_PROT_VR12_5MV: 40 info->vrm_version[i] = vr12; 41 break; 42 case XDPE122_PROT_IMVP9_10MV: 43 info->vrm_version[i] = imvp9; 44 break; 45 case XDPE122_AMD_625MV: 46 info->vrm_version[i] = amd625mv; 47 break; 48 default: 49 return -EINVAL; 50 } 51 } 52 53 return 0; 54 } 55 56 static struct pmbus_driver_info xdpe122_info = { 57 .pages = XDPE122_PAGE_NUM, 58 .format[PSC_VOLTAGE_IN] = linear, 59 .format[PSC_VOLTAGE_OUT] = vid, 60 .format[PSC_TEMPERATURE] = linear, 61 .format[PSC_CURRENT_IN] = linear, 62 .format[PSC_CURRENT_OUT] = linear, 63 .format[PSC_POWER] = linear, 64 .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | 65 PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | 66 PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | 67 PMBUS_HAVE_POUT | PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT, 68 .func[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | 69 PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | 70 PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | 71 PMBUS_HAVE_POUT | PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT, 72 .identify = xdpe122_identify, 73 }; 74 75 static int xdpe122_probe(struct i2c_client *client, 76 const struct i2c_device_id *id) 77 { 78 struct pmbus_driver_info *info; 79 80 info = devm_kmemdup(&client->dev, &xdpe122_info, sizeof(*info), 81 GFP_KERNEL); 82 if (!info) 83 return -ENOMEM; 84 85 return pmbus_do_probe(client, id, info); 86 } 87 88 static const struct i2c_device_id xdpe122_id[] = { 89 {"xdpe12254", 0}, 90 {"xdpe12284", 0}, 91 {} 92 }; 93 94 MODULE_DEVICE_TABLE(i2c, xdpe122_id); 95 96 static const struct of_device_id __maybe_unused xdpe122_of_match[] = { 97 {.compatible = "infineon, xdpe12254"}, 98 {.compatible = "infineon, xdpe12284"}, 99 {} 100 }; 101 MODULE_DEVICE_TABLE(of, xdpe122_of_match); 102 103 static struct i2c_driver xdpe122_driver = { 104 .driver = { 105 .name = "xdpe12284", 106 .of_match_table = of_match_ptr(xdpe122_of_match), 107 }, 108 .probe = xdpe122_probe, 109 .remove = pmbus_do_remove, 110 .id_table = xdpe122_id, 111 }; 112 113 module_i2c_driver(xdpe122_driver); 114 115 MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>"); 116 MODULE_DESCRIPTION("PMBus driver for Infineon XDPE122 family"); 117 MODULE_LICENSE("GPL"); 118