1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Hardware monitoring driver for IR35221 4 * 5 * Copyright (C) IBM Corporation 2017. 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 IR35221_MFR_VIN_PEAK 0xc5 16 #define IR35221_MFR_VOUT_PEAK 0xc6 17 #define IR35221_MFR_IOUT_PEAK 0xc7 18 #define IR35221_MFR_TEMP_PEAK 0xc8 19 #define IR35221_MFR_VIN_VALLEY 0xc9 20 #define IR35221_MFR_VOUT_VALLEY 0xca 21 #define IR35221_MFR_IOUT_VALLEY 0xcb 22 #define IR35221_MFR_TEMP_VALLEY 0xcc 23 24 static int ir35221_read_word_data(struct i2c_client *client, int page, 25 int phase, int reg) 26 { 27 int ret; 28 29 switch (reg) { 30 case PMBUS_VIRT_READ_VIN_MAX: 31 ret = pmbus_read_word_data(client, page, phase, 32 IR35221_MFR_VIN_PEAK); 33 break; 34 case PMBUS_VIRT_READ_VOUT_MAX: 35 ret = pmbus_read_word_data(client, page, phase, 36 IR35221_MFR_VOUT_PEAK); 37 break; 38 case PMBUS_VIRT_READ_IOUT_MAX: 39 ret = pmbus_read_word_data(client, page, phase, 40 IR35221_MFR_IOUT_PEAK); 41 break; 42 case PMBUS_VIRT_READ_TEMP_MAX: 43 ret = pmbus_read_word_data(client, page, phase, 44 IR35221_MFR_TEMP_PEAK); 45 break; 46 case PMBUS_VIRT_READ_VIN_MIN: 47 ret = pmbus_read_word_data(client, page, phase, 48 IR35221_MFR_VIN_VALLEY); 49 break; 50 case PMBUS_VIRT_READ_VOUT_MIN: 51 ret = pmbus_read_word_data(client, page, phase, 52 IR35221_MFR_VOUT_VALLEY); 53 break; 54 case PMBUS_VIRT_READ_IOUT_MIN: 55 ret = pmbus_read_word_data(client, page, phase, 56 IR35221_MFR_IOUT_VALLEY); 57 break; 58 case PMBUS_VIRT_READ_TEMP_MIN: 59 ret = pmbus_read_word_data(client, page, phase, 60 IR35221_MFR_TEMP_VALLEY); 61 break; 62 default: 63 ret = -ENODATA; 64 break; 65 } 66 67 return ret; 68 } 69 70 static int ir35221_probe(struct i2c_client *client) 71 { 72 struct pmbus_driver_info *info; 73 u8 buf[I2C_SMBUS_BLOCK_MAX]; 74 int ret; 75 76 if (!i2c_check_functionality(client->adapter, 77 I2C_FUNC_SMBUS_READ_BYTE_DATA 78 | I2C_FUNC_SMBUS_READ_WORD_DATA 79 | I2C_FUNC_SMBUS_READ_BLOCK_DATA)) 80 return -ENODEV; 81 82 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf); 83 if (ret < 0) { 84 dev_err(&client->dev, "Failed to read PMBUS_MFR_ID\n"); 85 return ret; 86 } 87 if (ret != 2 || strncmp(buf, "RI", strlen("RI"))) { 88 dev_err(&client->dev, "MFR_ID unrecognised\n"); 89 return -ENODEV; 90 } 91 92 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf); 93 if (ret < 0) { 94 dev_err(&client->dev, "Failed to read PMBUS_MFR_MODEL\n"); 95 return ret; 96 } 97 if (ret != 2 || !(buf[0] == 0x6c && buf[1] == 0x00)) { 98 dev_err(&client->dev, "MFR_MODEL unrecognised\n"); 99 return -ENODEV; 100 } 101 102 info = devm_kzalloc(&client->dev, sizeof(struct pmbus_driver_info), 103 GFP_KERNEL); 104 if (!info) 105 return -ENOMEM; 106 107 info->read_word_data = ir35221_read_word_data; 108 109 info->pages = 2; 110 info->format[PSC_VOLTAGE_IN] = linear; 111 info->format[PSC_VOLTAGE_OUT] = linear; 112 info->format[PSC_CURRENT_IN] = linear; 113 info->format[PSC_CURRENT_OUT] = linear; 114 info->format[PSC_POWER] = linear; 115 info->format[PSC_TEMPERATURE] = linear; 116 117 info->func[0] = PMBUS_HAVE_VIN 118 | PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN 119 | PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN 120 | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP 121 | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT 122 | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP; 123 info->func[1] = info->func[0]; 124 125 return pmbus_do_probe(client, info); 126 } 127 128 static const struct i2c_device_id ir35221_id[] = { 129 {"ir35221", 0}, 130 {} 131 }; 132 133 MODULE_DEVICE_TABLE(i2c, ir35221_id); 134 135 static struct i2c_driver ir35221_driver = { 136 .driver = { 137 .name = "ir35221", 138 }, 139 .probe = ir35221_probe, 140 .id_table = ir35221_id, 141 }; 142 143 module_i2c_driver(ir35221_driver); 144 145 MODULE_AUTHOR("Samuel Mendoza-Jonas <sam@mendozajonas.com"); 146 MODULE_DESCRIPTION("PMBus driver for IR35221"); 147 MODULE_LICENSE("GPL"); 148 MODULE_IMPORT_NS(PMBUS); 149