1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Hardware monitoring driver for Infineon Multi-phase Digital XDPE1A2G5B 4 * and XDPE1A2G7B Controllers 5 * 6 * Copyright (c) 2026 Infineon Technologies. All rights reserved. 7 */ 8 9 #include <linux/err.h> 10 #include <linux/i2c.h> 11 #include <linux/init.h> 12 #include <linux/kernel.h> 13 #include <linux/module.h> 14 #include "pmbus.h" 15 16 #define XDPE1A2G7B_PAGE_NUM 2 17 #define XDPE1A2G7B_NVIDIA_195MV 0x1E /* NVIDIA mode 1.95mV, VID step is 5mV */ 18 19 static int xdpe1a2g7b_identify(struct i2c_client *client, 20 struct pmbus_driver_info *info) 21 { 22 u8 vout_params; 23 int vout_mode; 24 25 /* 26 * XDPE1A2G5B and XDPE1A2G7B support both Linear and NVIDIA PWM VID data 27 * formats via VOUT_MODE. Note that the device pages/loops are not fully 28 * independent: configuration is shared, so programming each page/loop 29 * separately is not supported. 30 */ 31 vout_mode = pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE); 32 if (vout_mode < 0) 33 return vout_mode; 34 35 switch (vout_mode >> 5) { 36 case 0: 37 info->format[PSC_VOLTAGE_OUT] = linear; 38 return 0; 39 case 1: 40 info->format[PSC_VOLTAGE_OUT] = vid; 41 vout_params = vout_mode & GENMASK(4, 0); 42 /* Check for VID Code Type */ 43 switch (vout_params) { 44 case XDPE1A2G7B_NVIDIA_195MV: 45 /* VID vrm_version for PAGE0 and PAGE1 */ 46 info->vrm_version[0] = nvidia195mv; 47 info->vrm_version[1] = nvidia195mv; 48 break; 49 default: 50 return -EINVAL; 51 } 52 break; 53 default: 54 return -ENODEV; 55 } 56 57 return 0; 58 } 59 60 static struct pmbus_driver_info xdpe1a2g7b_info = { 61 .pages = XDPE1A2G7B_PAGE_NUM, 62 .identify = xdpe1a2g7b_identify, 63 .format[PSC_VOLTAGE_IN] = linear, 64 .format[PSC_TEMPERATURE] = linear, 65 .format[PSC_CURRENT_IN] = linear, 66 .format[PSC_CURRENT_OUT] = linear, 67 .format[PSC_POWER] = linear, 68 .func[0] = 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_TEMP2 | PMBUS_HAVE_STATUS_TEMP | 71 PMBUS_HAVE_POUT | PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT, 72 .func[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | 73 PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | 74 PMBUS_HAVE_PIN | PMBUS_HAVE_POUT | PMBUS_HAVE_STATUS_INPUT, 75 }; 76 77 static int xdpe1a2g7b_probe(struct i2c_client *client) 78 { 79 struct pmbus_driver_info *info; 80 81 info = devm_kmemdup(&client->dev, &xdpe1a2g7b_info, sizeof(*info), 82 GFP_KERNEL); 83 if (!info) 84 return -ENOMEM; 85 86 return pmbus_do_probe(client, info); 87 } 88 89 static const struct i2c_device_id xdpe1a2g7b_id[] = { 90 { "xdpe1a2g5b" }, 91 { "xdpe1a2g7b" }, 92 {} 93 }; 94 95 MODULE_DEVICE_TABLE(i2c, xdpe1a2g7b_id); 96 97 static const struct of_device_id __maybe_unused xdpe1a2g7b_of_match[] = { 98 { .compatible = "infineon,xdpe1a2g5b" }, 99 { .compatible = "infineon,xdpe1a2g7b" }, 100 {} 101 }; 102 103 MODULE_DEVICE_TABLE(of, xdpe1a2g7b_of_match); 104 105 static struct i2c_driver xdpe1a2g7b_driver = { 106 .driver = { 107 .name = "xdpe1a2g7b", 108 .of_match_table = of_match_ptr(xdpe1a2g7b_of_match), 109 }, 110 .probe = xdpe1a2g7b_probe, 111 .id_table = xdpe1a2g7b_id, 112 }; 113 114 module_i2c_driver(xdpe1a2g7b_driver); 115 116 MODULE_AUTHOR("Ashish Yadav <ashish.yadav@infineon.com>"); 117 MODULE_DESCRIPTION("PMBus driver for Infineon XDPE1A2G5B/7B"); 118 MODULE_LICENSE("GPL"); 119 MODULE_IMPORT_NS("PMBUS"); 120