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 const struct i2c_device_id *id) 72 { 73 struct pmbus_driver_info *info; 74 u8 buf[I2C_SMBUS_BLOCK_MAX]; 75 int ret; 76 77 if (!i2c_check_functionality(client->adapter, 78 I2C_FUNC_SMBUS_READ_BYTE_DATA 79 | I2C_FUNC_SMBUS_READ_WORD_DATA 80 | I2C_FUNC_SMBUS_READ_BLOCK_DATA)) 81 return -ENODEV; 82 83 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf); 84 if (ret < 0) { 85 dev_err(&client->dev, "Failed to read PMBUS_MFR_ID\n"); 86 return ret; 87 } 88 if (ret != 2 || strncmp(buf, "RI", strlen("RI"))) { 89 dev_err(&client->dev, "MFR_ID unrecognised\n"); 90 return -ENODEV; 91 } 92 93 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf); 94 if (ret < 0) { 95 dev_err(&client->dev, "Failed to read PMBUS_MFR_MODEL\n"); 96 return ret; 97 } 98 if (ret != 2 || !(buf[0] == 0x6c && buf[1] == 0x00)) { 99 dev_err(&client->dev, "MFR_MODEL unrecognised\n"); 100 return -ENODEV; 101 } 102 103 info = devm_kzalloc(&client->dev, sizeof(struct pmbus_driver_info), 104 GFP_KERNEL); 105 if (!info) 106 return -ENOMEM; 107 108 info->read_word_data = ir35221_read_word_data; 109 110 info->pages = 2; 111 info->format[PSC_VOLTAGE_IN] = linear; 112 info->format[PSC_VOLTAGE_OUT] = linear; 113 info->format[PSC_CURRENT_IN] = linear; 114 info->format[PSC_CURRENT_OUT] = linear; 115 info->format[PSC_POWER] = linear; 116 info->format[PSC_TEMPERATURE] = linear; 117 118 info->func[0] = PMBUS_HAVE_VIN 119 | PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN 120 | PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN 121 | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP 122 | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT 123 | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP; 124 info->func[1] = info->func[0]; 125 126 return pmbus_do_probe(client, id, info); 127 } 128 129 static const struct i2c_device_id ir35221_id[] = { 130 {"ir35221", 0}, 131 {} 132 }; 133 134 MODULE_DEVICE_TABLE(i2c, ir35221_id); 135 136 static struct i2c_driver ir35221_driver = { 137 .driver = { 138 .name = "ir35221", 139 }, 140 .probe = ir35221_probe, 141 .remove = pmbus_do_remove, 142 .id_table = ir35221_id, 143 }; 144 145 module_i2c_driver(ir35221_driver); 146 147 MODULE_AUTHOR("Samuel Mendoza-Jonas <sam@mendozajonas.com"); 148 MODULE_DESCRIPTION("PMBus driver for IR35221"); 149 MODULE_LICENSE("GPL"); 150