1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Hardware monitoring driver for Infineon IR36021 4 * 5 * Copyright (c) 2021 Allied Telesis 6 */ 7 #include <linux/err.h> 8 #include <linux/i2c.h> 9 #include <linux/init.h> 10 #include <linux/kernel.h> 11 #include <linux/module.h> 12 #include "pmbus.h" 13 14 static struct pmbus_driver_info ir36021_info = { 15 .pages = 1, 16 .format[PSC_VOLTAGE_IN] = linear, 17 .format[PSC_VOLTAGE_OUT] = linear, 18 .format[PSC_CURRENT_IN] = linear, 19 .format[PSC_CURRENT_OUT] = linear, 20 .format[PSC_POWER] = linear, 21 .format[PSC_TEMPERATURE] = linear, 22 .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT 23 | PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT 24 | PMBUS_HAVE_PIN | PMBUS_HAVE_POUT 25 | PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 26 | PMBUS_HAVE_STATUS_TEMP, 27 }; 28 29 static int ir36021_probe(struct i2c_client *client) 30 { 31 u8 buf[I2C_SMBUS_BLOCK_MAX]; 32 int ret; 33 34 if (!i2c_check_functionality(client->adapter, 35 I2C_FUNC_SMBUS_READ_BYTE_DATA 36 | I2C_FUNC_SMBUS_READ_WORD_DATA 37 | I2C_FUNC_SMBUS_READ_BLOCK_DATA)) 38 return -ENODEV; 39 40 ret = i2c_smbus_read_i2c_block_data(client, PMBUS_MFR_MODEL, 2, buf); 41 if (ret < 0) { 42 dev_err(&client->dev, "Failed to read PMBUS_MFR_MODEL\n"); 43 return ret; 44 } 45 if (ret != 2 || buf[0] != 0x01 || buf[1] != 0x2d) { 46 dev_err(&client->dev, "MFR_MODEL unrecognised\n"); 47 return -ENODEV; 48 } 49 50 return pmbus_do_probe(client, &ir36021_info); 51 } 52 53 static const struct i2c_device_id ir36021_id[] = { 54 { "ir36021", 0 }, 55 {}, 56 }; 57 MODULE_DEVICE_TABLE(i2c, ir36021_id); 58 59 static const struct of_device_id __maybe_unused ir36021_of_id[] = { 60 { .compatible = "infineon,ir36021" }, 61 {}, 62 }; 63 MODULE_DEVICE_TABLE(of, ir36021_of_id); 64 65 static struct i2c_driver ir36021_driver = { 66 .class = I2C_CLASS_HWMON, 67 .driver = { 68 .name = "ir36021", 69 .of_match_table = of_match_ptr(ir36021_of_id), 70 }, 71 .probe_new = ir36021_probe, 72 .id_table = ir36021_id, 73 }; 74 75 module_i2c_driver(ir36021_driver); 76 77 MODULE_AUTHOR("Chris Packham <chris.packham@alliedtelesis.co.nz>"); 78 MODULE_DESCRIPTION("PMBus driver for Infineon IR36021"); 79 MODULE_LICENSE("GPL"); 80 MODULE_IMPORT_NS(PMBUS); 81