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 i, ret; 28 29 for (i = 0; i < TPS53679_PAGE_NUM; i++) { 30 /* Read the register with VOUT scaling value.*/ 31 ret = pmbus_read_byte_data(client, i, PMBUS_VOUT_MODE); 32 if (ret < 0) 33 return ret; 34 35 vout_params = ret & GENMASK(4, 0); 36 37 switch (vout_params) { 38 case TPS53679_PROT_VR13_10MV: 39 case TPS53679_PROT_VR12_5_10MV: 40 info->vrm_version[i] = vr13; 41 break; 42 case TPS53679_PROT_VR13_5MV: 43 case TPS53679_PROT_VR12_5MV: 44 case TPS53679_PROT_IMVP8_5MV: 45 info->vrm_version[i] = vr12; 46 break; 47 default: 48 return -EINVAL; 49 } 50 } 51 52 return 0; 53 } 54 55 static struct pmbus_driver_info tps53679_info = { 56 .pages = TPS53679_PAGE_NUM, 57 .format[PSC_VOLTAGE_IN] = linear, 58 .format[PSC_VOLTAGE_OUT] = vid, 59 .format[PSC_TEMPERATURE] = linear, 60 .format[PSC_CURRENT_OUT] = linear, 61 .format[PSC_POWER] = linear, 62 .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | 63 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | 64 PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | 65 PMBUS_HAVE_POUT, 66 .func[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | 67 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | 68 PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | 69 PMBUS_HAVE_POUT, 70 .identify = tps53679_identify, 71 }; 72 73 static int tps53679_probe(struct i2c_client *client, 74 const struct i2c_device_id *id) 75 { 76 struct pmbus_driver_info *info; 77 78 info = devm_kmemdup(&client->dev, &tps53679_info, sizeof(*info), 79 GFP_KERNEL); 80 if (!info) 81 return -ENOMEM; 82 83 return pmbus_do_probe(client, id, info); 84 } 85 86 static const struct i2c_device_id tps53679_id[] = { 87 {"tps53679", 0}, 88 {} 89 }; 90 91 MODULE_DEVICE_TABLE(i2c, tps53679_id); 92 93 static const struct of_device_id __maybe_unused tps53679_of_match[] = { 94 {.compatible = "ti,tps53679"}, 95 {} 96 }; 97 MODULE_DEVICE_TABLE(of, tps53679_of_match); 98 99 static struct i2c_driver tps53679_driver = { 100 .driver = { 101 .name = "tps53679", 102 .of_match_table = of_match_ptr(tps53679_of_match), 103 }, 104 .probe = tps53679_probe, 105 .remove = pmbus_do_remove, 106 .id_table = tps53679_id, 107 }; 108 109 module_i2c_driver(tps53679_driver); 110 111 MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>"); 112 MODULE_DESCRIPTION("PMBus driver for Texas Instruments TPS53679"); 113 MODULE_LICENSE("GPL"); 114