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 return -ENODEV; 45 } 46 } 47 } 48 49 return 0; 50 } 51 52 static struct pmbus_driver_info pxe1610_info = { 53 .pages = PXE1610_NUM_PAGES, 54 .format[PSC_VOLTAGE_IN] = linear, 55 .format[PSC_VOLTAGE_OUT] = vid, 56 .format[PSC_CURRENT_IN] = linear, 57 .format[PSC_CURRENT_OUT] = linear, 58 .format[PSC_TEMPERATURE] = linear, 59 .format[PSC_POWER] = linear, 60 .func[0] = PMBUS_HAVE_VIN 61 | PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN 62 | PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN 63 | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP 64 | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT 65 | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP, 66 .func[1] = PMBUS_HAVE_VIN 67 | PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN 68 | PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN 69 | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP 70 | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT 71 | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP, 72 .func[2] = PMBUS_HAVE_VIN 73 | PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN 74 | PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN 75 | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP 76 | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT 77 | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP, 78 .identify = pxe1610_identify, 79 }; 80 81 static int pxe1610_probe(struct i2c_client *client, 82 const struct i2c_device_id *id) 83 { 84 struct pmbus_driver_info *info; 85 u8 buf[I2C_SMBUS_BLOCK_MAX]; 86 int ret; 87 88 if (!i2c_check_functionality( 89 client->adapter, 90 I2C_FUNC_SMBUS_READ_BYTE_DATA 91 | I2C_FUNC_SMBUS_READ_WORD_DATA 92 | I2C_FUNC_SMBUS_READ_BLOCK_DATA)) 93 return -ENODEV; 94 95 /* 96 * By default this device doesn't boot to page 0, so set page 0 97 * to access all pmbus registers. 98 */ 99 i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0); 100 101 /* Read Manufacturer id */ 102 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf); 103 if (ret < 0) { 104 dev_err(&client->dev, "Failed to read PMBUS_MFR_ID\n"); 105 return ret; 106 } 107 if (ret != 2 || strncmp(buf, "XP", 2)) { 108 dev_err(&client->dev, "MFR_ID unrecognized\n"); 109 return -ENODEV; 110 } 111 112 info = devm_kmemdup(&client->dev, &pxe1610_info, 113 sizeof(struct pmbus_driver_info), 114 GFP_KERNEL); 115 if (!info) 116 return -ENOMEM; 117 118 return pmbus_do_probe(client, id, info); 119 } 120 121 static const struct i2c_device_id pxe1610_id[] = { 122 {"pxe1610", 0}, 123 {"pxe1110", 0}, 124 {"pxm1310", 0}, 125 {} 126 }; 127 128 MODULE_DEVICE_TABLE(i2c, pxe1610_id); 129 130 static struct i2c_driver pxe1610_driver = { 131 .driver = { 132 .name = "pxe1610", 133 }, 134 .probe = pxe1610_probe, 135 .remove = pmbus_do_remove, 136 .id_table = pxe1610_id, 137 }; 138 139 module_i2c_driver(pxe1610_driver); 140 141 MODULE_AUTHOR("Vijay Khemka <vijaykhemka@fb.com>"); 142 MODULE_DESCRIPTION("PMBus driver for Infineon PXE1610, PXE1110 and PXM1310"); 143 MODULE_LICENSE("GPL"); 144