1*2874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 28991ebd9SSamuel Mendoza-Jonas /* 38991ebd9SSamuel Mendoza-Jonas * Hardware monitoring driver for IR35221 48991ebd9SSamuel Mendoza-Jonas * 58991ebd9SSamuel Mendoza-Jonas * Copyright (C) IBM Corporation 2017. 68991ebd9SSamuel Mendoza-Jonas */ 78991ebd9SSamuel Mendoza-Jonas 88991ebd9SSamuel Mendoza-Jonas #include <linux/err.h> 98991ebd9SSamuel Mendoza-Jonas #include <linux/i2c.h> 108991ebd9SSamuel Mendoza-Jonas #include <linux/init.h> 118991ebd9SSamuel Mendoza-Jonas #include <linux/kernel.h> 128991ebd9SSamuel Mendoza-Jonas #include <linux/module.h> 138991ebd9SSamuel Mendoza-Jonas #include "pmbus.h" 148991ebd9SSamuel Mendoza-Jonas 158991ebd9SSamuel Mendoza-Jonas #define IR35221_MFR_VIN_PEAK 0xc5 168991ebd9SSamuel Mendoza-Jonas #define IR35221_MFR_VOUT_PEAK 0xc6 178991ebd9SSamuel Mendoza-Jonas #define IR35221_MFR_IOUT_PEAK 0xc7 188991ebd9SSamuel Mendoza-Jonas #define IR35221_MFR_TEMP_PEAK 0xc8 198991ebd9SSamuel Mendoza-Jonas #define IR35221_MFR_VIN_VALLEY 0xc9 208991ebd9SSamuel Mendoza-Jonas #define IR35221_MFR_VOUT_VALLEY 0xca 218991ebd9SSamuel Mendoza-Jonas #define IR35221_MFR_IOUT_VALLEY 0xcb 228991ebd9SSamuel Mendoza-Jonas #define IR35221_MFR_TEMP_VALLEY 0xcc 238991ebd9SSamuel Mendoza-Jonas 248991ebd9SSamuel Mendoza-Jonas static int ir35221_read_word_data(struct i2c_client *client, int page, int reg) 258991ebd9SSamuel Mendoza-Jonas { 268991ebd9SSamuel Mendoza-Jonas int ret; 278991ebd9SSamuel Mendoza-Jonas 288991ebd9SSamuel Mendoza-Jonas switch (reg) { 298991ebd9SSamuel Mendoza-Jonas case PMBUS_VIRT_READ_VIN_MAX: 308991ebd9SSamuel Mendoza-Jonas ret = pmbus_read_word_data(client, page, IR35221_MFR_VIN_PEAK); 318991ebd9SSamuel Mendoza-Jonas break; 328991ebd9SSamuel Mendoza-Jonas case PMBUS_VIRT_READ_VOUT_MAX: 338991ebd9SSamuel Mendoza-Jonas ret = pmbus_read_word_data(client, page, IR35221_MFR_VOUT_PEAK); 348991ebd9SSamuel Mendoza-Jonas break; 358991ebd9SSamuel Mendoza-Jonas case PMBUS_VIRT_READ_IOUT_MAX: 368991ebd9SSamuel Mendoza-Jonas ret = pmbus_read_word_data(client, page, IR35221_MFR_IOUT_PEAK); 378991ebd9SSamuel Mendoza-Jonas break; 388991ebd9SSamuel Mendoza-Jonas case PMBUS_VIRT_READ_TEMP_MAX: 398991ebd9SSamuel Mendoza-Jonas ret = pmbus_read_word_data(client, page, IR35221_MFR_TEMP_PEAK); 408991ebd9SSamuel Mendoza-Jonas break; 418991ebd9SSamuel Mendoza-Jonas case PMBUS_VIRT_READ_VIN_MIN: 428991ebd9SSamuel Mendoza-Jonas ret = pmbus_read_word_data(client, page, 438991ebd9SSamuel Mendoza-Jonas IR35221_MFR_VIN_VALLEY); 448991ebd9SSamuel Mendoza-Jonas break; 458991ebd9SSamuel Mendoza-Jonas case PMBUS_VIRT_READ_VOUT_MIN: 468991ebd9SSamuel Mendoza-Jonas ret = pmbus_read_word_data(client, page, 478991ebd9SSamuel Mendoza-Jonas IR35221_MFR_VOUT_VALLEY); 488991ebd9SSamuel Mendoza-Jonas break; 498991ebd9SSamuel Mendoza-Jonas case PMBUS_VIRT_READ_IOUT_MIN: 508991ebd9SSamuel Mendoza-Jonas ret = pmbus_read_word_data(client, page, 518991ebd9SSamuel Mendoza-Jonas IR35221_MFR_IOUT_VALLEY); 528991ebd9SSamuel Mendoza-Jonas break; 538991ebd9SSamuel Mendoza-Jonas case PMBUS_VIRT_READ_TEMP_MIN: 548991ebd9SSamuel Mendoza-Jonas ret = pmbus_read_word_data(client, page, 558991ebd9SSamuel Mendoza-Jonas IR35221_MFR_TEMP_VALLEY); 568991ebd9SSamuel Mendoza-Jonas break; 578991ebd9SSamuel Mendoza-Jonas default: 588991ebd9SSamuel Mendoza-Jonas ret = -ENODATA; 598991ebd9SSamuel Mendoza-Jonas break; 608991ebd9SSamuel Mendoza-Jonas } 618991ebd9SSamuel Mendoza-Jonas 628991ebd9SSamuel Mendoza-Jonas return ret; 638991ebd9SSamuel Mendoza-Jonas } 648991ebd9SSamuel Mendoza-Jonas 658991ebd9SSamuel Mendoza-Jonas static int ir35221_probe(struct i2c_client *client, 668991ebd9SSamuel Mendoza-Jonas const struct i2c_device_id *id) 678991ebd9SSamuel Mendoza-Jonas { 688991ebd9SSamuel Mendoza-Jonas struct pmbus_driver_info *info; 698991ebd9SSamuel Mendoza-Jonas u8 buf[I2C_SMBUS_BLOCK_MAX]; 708991ebd9SSamuel Mendoza-Jonas int ret; 718991ebd9SSamuel Mendoza-Jonas 728991ebd9SSamuel Mendoza-Jonas if (!i2c_check_functionality(client->adapter, 738991ebd9SSamuel Mendoza-Jonas I2C_FUNC_SMBUS_READ_BYTE_DATA 748991ebd9SSamuel Mendoza-Jonas | I2C_FUNC_SMBUS_READ_WORD_DATA 758991ebd9SSamuel Mendoza-Jonas | I2C_FUNC_SMBUS_READ_BLOCK_DATA)) 768991ebd9SSamuel Mendoza-Jonas return -ENODEV; 778991ebd9SSamuel Mendoza-Jonas 788991ebd9SSamuel Mendoza-Jonas ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf); 798991ebd9SSamuel Mendoza-Jonas if (ret < 0) { 808991ebd9SSamuel Mendoza-Jonas dev_err(&client->dev, "Failed to read PMBUS_MFR_ID\n"); 818991ebd9SSamuel Mendoza-Jonas return ret; 828991ebd9SSamuel Mendoza-Jonas } 838991ebd9SSamuel Mendoza-Jonas if (ret != 2 || strncmp(buf, "RI", strlen("RI"))) { 848991ebd9SSamuel Mendoza-Jonas dev_err(&client->dev, "MFR_ID unrecognised\n"); 858991ebd9SSamuel Mendoza-Jonas return -ENODEV; 868991ebd9SSamuel Mendoza-Jonas } 878991ebd9SSamuel Mendoza-Jonas 888991ebd9SSamuel Mendoza-Jonas ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf); 898991ebd9SSamuel Mendoza-Jonas if (ret < 0) { 908991ebd9SSamuel Mendoza-Jonas dev_err(&client->dev, "Failed to read PMBUS_MFR_MODEL\n"); 918991ebd9SSamuel Mendoza-Jonas return ret; 928991ebd9SSamuel Mendoza-Jonas } 938991ebd9SSamuel Mendoza-Jonas if (ret != 2 || !(buf[0] == 0x6c && buf[1] == 0x00)) { 948991ebd9SSamuel Mendoza-Jonas dev_err(&client->dev, "MFR_MODEL unrecognised\n"); 958991ebd9SSamuel Mendoza-Jonas return -ENODEV; 968991ebd9SSamuel Mendoza-Jonas } 978991ebd9SSamuel Mendoza-Jonas 988991ebd9SSamuel Mendoza-Jonas info = devm_kzalloc(&client->dev, sizeof(struct pmbus_driver_info), 998991ebd9SSamuel Mendoza-Jonas GFP_KERNEL); 1008991ebd9SSamuel Mendoza-Jonas if (!info) 1018991ebd9SSamuel Mendoza-Jonas return -ENOMEM; 1028991ebd9SSamuel Mendoza-Jonas 1038991ebd9SSamuel Mendoza-Jonas info->read_word_data = ir35221_read_word_data; 1048991ebd9SSamuel Mendoza-Jonas 1058991ebd9SSamuel Mendoza-Jonas info->pages = 2; 1068991ebd9SSamuel Mendoza-Jonas info->format[PSC_VOLTAGE_IN] = linear; 1078991ebd9SSamuel Mendoza-Jonas info->format[PSC_VOLTAGE_OUT] = linear; 1088991ebd9SSamuel Mendoza-Jonas info->format[PSC_CURRENT_IN] = linear; 1098991ebd9SSamuel Mendoza-Jonas info->format[PSC_CURRENT_OUT] = linear; 1108991ebd9SSamuel Mendoza-Jonas info->format[PSC_POWER] = linear; 1118991ebd9SSamuel Mendoza-Jonas info->format[PSC_TEMPERATURE] = linear; 1128991ebd9SSamuel Mendoza-Jonas 1138991ebd9SSamuel Mendoza-Jonas info->func[0] = PMBUS_HAVE_VIN 1148991ebd9SSamuel Mendoza-Jonas | PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN 1158991ebd9SSamuel Mendoza-Jonas | PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN 1168991ebd9SSamuel Mendoza-Jonas | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP 1178991ebd9SSamuel Mendoza-Jonas | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT 1188991ebd9SSamuel Mendoza-Jonas | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP; 1198991ebd9SSamuel Mendoza-Jonas info->func[1] = info->func[0]; 1208991ebd9SSamuel Mendoza-Jonas 1218991ebd9SSamuel Mendoza-Jonas return pmbus_do_probe(client, id, info); 1228991ebd9SSamuel Mendoza-Jonas } 1238991ebd9SSamuel Mendoza-Jonas 1248991ebd9SSamuel Mendoza-Jonas static const struct i2c_device_id ir35221_id[] = { 1258991ebd9SSamuel Mendoza-Jonas {"ir35221", 0}, 1268991ebd9SSamuel Mendoza-Jonas {} 1278991ebd9SSamuel Mendoza-Jonas }; 1288991ebd9SSamuel Mendoza-Jonas 1298991ebd9SSamuel Mendoza-Jonas MODULE_DEVICE_TABLE(i2c, ir35221_id); 1308991ebd9SSamuel Mendoza-Jonas 1318991ebd9SSamuel Mendoza-Jonas static struct i2c_driver ir35221_driver = { 1328991ebd9SSamuel Mendoza-Jonas .driver = { 1338991ebd9SSamuel Mendoza-Jonas .name = "ir35221", 1348991ebd9SSamuel Mendoza-Jonas }, 1358991ebd9SSamuel Mendoza-Jonas .probe = ir35221_probe, 1368991ebd9SSamuel Mendoza-Jonas .remove = pmbus_do_remove, 1378991ebd9SSamuel Mendoza-Jonas .id_table = ir35221_id, 1388991ebd9SSamuel Mendoza-Jonas }; 1398991ebd9SSamuel Mendoza-Jonas 1408991ebd9SSamuel Mendoza-Jonas module_i2c_driver(ir35221_driver); 1418991ebd9SSamuel Mendoza-Jonas 1428991ebd9SSamuel Mendoza-Jonas MODULE_AUTHOR("Samuel Mendoza-Jonas <sam@mendozajonas.com"); 1438991ebd9SSamuel Mendoza-Jonas MODULE_DESCRIPTION("PMBus driver for IR35221"); 1448991ebd9SSamuel Mendoza-Jonas MODULE_LICENSE("GPL"); 145