1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Hardware monitoring driver for Maxim MAX16064 4 * 5 * Copyright (c) 2011 Ericsson AB. 6 */ 7 8 #include <linux/kernel.h> 9 #include <linux/module.h> 10 #include <linux/init.h> 11 #include <linux/err.h> 12 #include <linux/i2c.h> 13 #include "pmbus.h" 14 15 #define MAX16064_MFR_VOUT_PEAK 0xd4 16 #define MAX16064_MFR_TEMPERATURE_PEAK 0xd6 17 18 static int max16064_read_word_data(struct i2c_client *client, int page, int reg) 19 { 20 int ret; 21 22 switch (reg) { 23 case PMBUS_VIRT_READ_VOUT_MAX: 24 ret = pmbus_read_word_data(client, page, 25 MAX16064_MFR_VOUT_PEAK); 26 break; 27 case PMBUS_VIRT_READ_TEMP_MAX: 28 ret = pmbus_read_word_data(client, page, 29 MAX16064_MFR_TEMPERATURE_PEAK); 30 break; 31 case PMBUS_VIRT_RESET_VOUT_HISTORY: 32 case PMBUS_VIRT_RESET_TEMP_HISTORY: 33 ret = 0; 34 break; 35 default: 36 ret = -ENODATA; 37 break; 38 } 39 return ret; 40 } 41 42 static int max16064_write_word_data(struct i2c_client *client, int page, 43 int reg, u16 word) 44 { 45 int ret; 46 47 switch (reg) { 48 case PMBUS_VIRT_RESET_VOUT_HISTORY: 49 ret = pmbus_write_word_data(client, page, 50 MAX16064_MFR_VOUT_PEAK, 0); 51 break; 52 case PMBUS_VIRT_RESET_TEMP_HISTORY: 53 ret = pmbus_write_word_data(client, page, 54 MAX16064_MFR_TEMPERATURE_PEAK, 55 0xffff); 56 break; 57 default: 58 ret = -ENODATA; 59 break; 60 } 61 return ret; 62 } 63 64 static struct pmbus_driver_info max16064_info = { 65 .pages = 4, 66 .format[PSC_VOLTAGE_IN] = direct, 67 .format[PSC_VOLTAGE_OUT] = direct, 68 .format[PSC_TEMPERATURE] = direct, 69 .m[PSC_VOLTAGE_IN] = 19995, 70 .b[PSC_VOLTAGE_IN] = 0, 71 .R[PSC_VOLTAGE_IN] = -1, 72 .m[PSC_VOLTAGE_OUT] = 19995, 73 .b[PSC_VOLTAGE_OUT] = 0, 74 .R[PSC_VOLTAGE_OUT] = -1, 75 .m[PSC_TEMPERATURE] = -7612, 76 .b[PSC_TEMPERATURE] = 335, 77 .R[PSC_TEMPERATURE] = -3, 78 .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_TEMP 79 | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_TEMP, 80 .func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT, 81 .func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT, 82 .func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT, 83 .read_word_data = max16064_read_word_data, 84 .write_word_data = max16064_write_word_data, 85 }; 86 87 static int max16064_probe(struct i2c_client *client, 88 const struct i2c_device_id *id) 89 { 90 return pmbus_do_probe(client, id, &max16064_info); 91 } 92 93 static const struct i2c_device_id max16064_id[] = { 94 {"max16064", 0}, 95 {} 96 }; 97 98 MODULE_DEVICE_TABLE(i2c, max16064_id); 99 100 /* This is the driver that will be inserted */ 101 static struct i2c_driver max16064_driver = { 102 .driver = { 103 .name = "max16064", 104 }, 105 .probe = max16064_probe, 106 .remove = pmbus_do_remove, 107 .id_table = max16064_id, 108 }; 109 110 module_i2c_driver(max16064_driver); 111 112 MODULE_AUTHOR("Guenter Roeck"); 113 MODULE_DESCRIPTION("PMBus driver for Maxim MAX16064"); 114 MODULE_LICENSE("GPL"); 115