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, 19 int phase, int reg) 20 { 21 int ret; 22 23 switch (reg) { 24 case PMBUS_VIRT_READ_VOUT_MAX: 25 ret = pmbus_read_word_data(client, page, phase, 26 MAX16064_MFR_VOUT_PEAK); 27 break; 28 case PMBUS_VIRT_READ_TEMP_MAX: 29 ret = pmbus_read_word_data(client, page, phase, 30 MAX16064_MFR_TEMPERATURE_PEAK); 31 break; 32 case PMBUS_VIRT_RESET_VOUT_HISTORY: 33 case PMBUS_VIRT_RESET_TEMP_HISTORY: 34 ret = 0; 35 break; 36 default: 37 ret = -ENODATA; 38 break; 39 } 40 return ret; 41 } 42 43 static int max16064_write_word_data(struct i2c_client *client, int page, 44 int reg, u16 word) 45 { 46 int ret; 47 48 switch (reg) { 49 case PMBUS_VIRT_RESET_VOUT_HISTORY: 50 ret = pmbus_write_word_data(client, page, 51 MAX16064_MFR_VOUT_PEAK, 0); 52 break; 53 case PMBUS_VIRT_RESET_TEMP_HISTORY: 54 ret = pmbus_write_word_data(client, page, 55 MAX16064_MFR_TEMPERATURE_PEAK, 56 0xffff); 57 break; 58 default: 59 ret = -ENODATA; 60 break; 61 } 62 return ret; 63 } 64 65 static struct pmbus_driver_info max16064_info = { 66 .pages = 4, 67 .format[PSC_VOLTAGE_IN] = direct, 68 .format[PSC_VOLTAGE_OUT] = direct, 69 .format[PSC_TEMPERATURE] = direct, 70 .m[PSC_VOLTAGE_IN] = 19995, 71 .b[PSC_VOLTAGE_IN] = 0, 72 .R[PSC_VOLTAGE_IN] = -1, 73 .m[PSC_VOLTAGE_OUT] = 19995, 74 .b[PSC_VOLTAGE_OUT] = 0, 75 .R[PSC_VOLTAGE_OUT] = -1, 76 .m[PSC_TEMPERATURE] = -7612, 77 .b[PSC_TEMPERATURE] = 335, 78 .R[PSC_TEMPERATURE] = -3, 79 .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_TEMP 80 | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_TEMP, 81 .func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT, 82 .func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT, 83 .func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT, 84 .read_word_data = max16064_read_word_data, 85 .write_word_data = max16064_write_word_data, 86 }; 87 88 static int max16064_probe(struct i2c_client *client) 89 { 90 return pmbus_do_probe(client, &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_new = max16064_probe, 106 .id_table = max16064_id, 107 }; 108 109 module_i2c_driver(max16064_driver); 110 111 MODULE_AUTHOR("Guenter Roeck"); 112 MODULE_DESCRIPTION("PMBus driver for Maxim MAX16064"); 113 MODULE_LICENSE("GPL"); 114