1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Hardware monitoring driver for Infineon PXE1610 4 * 5 * Copyright (c) 2019 Facebook Inc 6 * 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 PXE1610_NUM_PAGES 3 17 18 /* Identify chip parameters. */ 19 static int pxe1610_identify(struct i2c_client *client, 20 struct pmbus_driver_info *info) 21 { 22 int i; 23 24 for (i = 0; i < PXE1610_NUM_PAGES; i++) { 25 if (pmbus_check_byte_register(client, i, PMBUS_VOUT_MODE)) { 26 u8 vout_mode; 27 int ret; 28 29 /* Read the register with VOUT scaling value.*/ 30 ret = pmbus_read_byte_data(client, i, PMBUS_VOUT_MODE); 31 if (ret < 0) 32 return ret; 33 34 vout_mode = ret & GENMASK(4, 0); 35 36 switch (vout_mode) { 37 case 1: 38 info->vrm_version[i] = vr12; 39 break; 40 case 2: 41 info->vrm_version[i] = vr13; 42 break; 43 default: 44 /* 45 * If prior pages are available limit operation 46 * to them 47 */ 48 if (i != 0) { 49 info->pages = i; 50 return 0; 51 } 52 53 return -ENODEV; 54 } 55 } 56 } 57 58 return 0; 59 } 60 61 static struct pmbus_driver_info pxe1610_info = { 62 .pages = PXE1610_NUM_PAGES, 63 .format[PSC_VOLTAGE_IN] = linear, 64 .format[PSC_VOLTAGE_OUT] = vid, 65 .format[PSC_CURRENT_IN] = linear, 66 .format[PSC_CURRENT_OUT] = linear, 67 .format[PSC_TEMPERATURE] = linear, 68 .format[PSC_POWER] = linear, 69 .func[0] = PMBUS_HAVE_VIN 70 | PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN 71 | PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN 72 | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP 73 | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT 74 | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP, 75 .func[1] = PMBUS_HAVE_VIN 76 | PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN 77 | PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN 78 | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP 79 | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT 80 | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP, 81 .func[2] = PMBUS_HAVE_VIN 82 | PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN 83 | PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN 84 | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP 85 | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT 86 | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP, 87 .identify = pxe1610_identify, 88 }; 89 90 static int pxe1610_probe(struct i2c_client *client) 91 { 92 struct pmbus_driver_info *info; 93 u8 buf[I2C_SMBUS_BLOCK_MAX]; 94 int ret; 95 96 if (!i2c_check_functionality( 97 client->adapter, 98 I2C_FUNC_SMBUS_READ_BYTE_DATA 99 | I2C_FUNC_SMBUS_READ_WORD_DATA 100 | I2C_FUNC_SMBUS_READ_BLOCK_DATA)) 101 return -ENODEV; 102 103 /* 104 * By default this device doesn't boot to page 0, so set page 0 105 * to access all pmbus registers. 106 */ 107 i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0); 108 109 /* Read Manufacturer id */ 110 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf); 111 if (ret < 0) { 112 dev_err(&client->dev, "Failed to read PMBUS_MFR_ID\n"); 113 return ret; 114 } 115 if (ret != 2 || strncmp(buf, "XP", 2)) { 116 dev_err(&client->dev, "MFR_ID unrecognized\n"); 117 return -ENODEV; 118 } 119 120 info = devm_kmemdup(&client->dev, &pxe1610_info, 121 sizeof(struct pmbus_driver_info), 122 GFP_KERNEL); 123 if (!info) 124 return -ENOMEM; 125 126 return pmbus_do_probe(client, info); 127 } 128 129 static const struct i2c_device_id pxe1610_id[] = { 130 {"pxe1610"}, 131 {"pxe1110"}, 132 {"pxm1310"}, 133 {} 134 }; 135 136 MODULE_DEVICE_TABLE(i2c, pxe1610_id); 137 138 static struct i2c_driver pxe1610_driver = { 139 .driver = { 140 .name = "pxe1610", 141 }, 142 .probe = pxe1610_probe, 143 .id_table = pxe1610_id, 144 }; 145 146 module_i2c_driver(pxe1610_driver); 147 148 MODULE_AUTHOR("Vijay Khemka <vijaykhemka@fb.com>"); 149 MODULE_DESCRIPTION("PMBus driver for Infineon PXE1610, PXE1110 and PXM1310"); 150 MODULE_LICENSE("GPL"); 151 MODULE_IMPORT_NS(PMBUS); 152