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