1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Hardware monitoring driver for Texas Instruments TPS53679 4 * 5 * Copyright (c) 2017 Mellanox Technologies. All rights reserved. 6 * Copyright (c) 2017 Vadim Pasternak <vadimp@mellanox.com> 7 */ 8 9 #include <linux/err.h> 10 #include <linux/i2c.h> 11 #include <linux/init.h> 12 #include <linux/kernel.h> 13 #include <linux/module.h> 14 #include "pmbus.h" 15 16 #define TPS53679_PROT_VR12_5MV 0x01 /* VR12.0 mode, 5-mV DAC */ 17 #define TPS53679_PROT_VR12_5_10MV 0x02 /* VR12.5 mode, 10-mV DAC */ 18 #define TPS53679_PROT_VR13_10MV 0x04 /* VR13.0 mode, 10-mV DAC */ 19 #define TPS53679_PROT_IMVP8_5MV 0x05 /* IMVP8 mode, 5-mV DAC */ 20 #define TPS53679_PROT_VR13_5MV 0x07 /* VR13.0 mode, 5-mV DAC */ 21 #define TPS53679_PAGE_NUM 2 22 23 static int tps53679_identify(struct i2c_client *client, 24 struct pmbus_driver_info *info) 25 { 26 u8 vout_params; 27 int ret; 28 29 /* Read the register with VOUT scaling value.*/ 30 ret = pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE); 31 if (ret < 0) 32 return ret; 33 34 vout_params = ret & GENMASK(4, 0); 35 36 switch (vout_params) { 37 case TPS53679_PROT_VR13_10MV: 38 case TPS53679_PROT_VR12_5_10MV: 39 info->vrm_version = vr13; 40 break; 41 case TPS53679_PROT_VR13_5MV: 42 case TPS53679_PROT_VR12_5MV: 43 case TPS53679_PROT_IMVP8_5MV: 44 info->vrm_version = vr12; 45 break; 46 default: 47 return -EINVAL; 48 } 49 50 return 0; 51 } 52 53 static struct pmbus_driver_info tps53679_info = { 54 .pages = TPS53679_PAGE_NUM, 55 .format[PSC_VOLTAGE_IN] = linear, 56 .format[PSC_VOLTAGE_OUT] = vid, 57 .format[PSC_TEMPERATURE] = linear, 58 .format[PSC_CURRENT_OUT] = linear, 59 .format[PSC_POWER] = linear, 60 .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | 61 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | 62 PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | 63 PMBUS_HAVE_POUT, 64 .func[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | 65 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | 66 PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | 67 PMBUS_HAVE_POUT, 68 .identify = tps53679_identify, 69 }; 70 71 static int tps53679_probe(struct i2c_client *client, 72 const struct i2c_device_id *id) 73 { 74 struct pmbus_driver_info *info; 75 76 info = devm_kmemdup(&client->dev, &tps53679_info, sizeof(*info), 77 GFP_KERNEL); 78 if (!info) 79 return -ENOMEM; 80 81 return pmbus_do_probe(client, id, info); 82 } 83 84 static const struct i2c_device_id tps53679_id[] = { 85 {"tps53679", 0}, 86 {} 87 }; 88 89 MODULE_DEVICE_TABLE(i2c, tps53679_id); 90 91 static const struct of_device_id __maybe_unused tps53679_of_match[] = { 92 {.compatible = "ti,tps53679"}, 93 {} 94 }; 95 MODULE_DEVICE_TABLE(of, tps53679_of_match); 96 97 static struct i2c_driver tps53679_driver = { 98 .driver = { 99 .name = "tps53679", 100 .of_match_table = of_match_ptr(tps53679_of_match), 101 }, 102 .probe = tps53679_probe, 103 .remove = pmbus_do_remove, 104 .id_table = tps53679_id, 105 }; 106 107 module_i2c_driver(tps53679_driver); 108 109 MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>"); 110 MODULE_DESCRIPTION("PMBus driver for Texas Instruments TPS53679"); 111 MODULE_LICENSE("GPL"); 112