1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Hardware monitoring driver for Vicor PLI1209BC Digital Supervisor 4 * 5 * Copyright (c) 2022 9elements GmbH 6 */ 7 8 #include <linux/i2c.h> 9 #include <linux/module.h> 10 #include <linux/pmbus.h> 11 #include <linux/regulator/driver.h> 12 #include "pmbus.h" 13 14 /* 15 * The capability command is only supported at page 0. Probing the device while 16 * the page register is set to 1 will falsely enable PEC support. Disable 17 * capability probing accordingly, since the PLI1209BC does not have any 18 * additional capabilities. 19 */ 20 static struct pmbus_platform_data pli1209bc_plat_data = { 21 .flags = PMBUS_NO_CAPABILITY, 22 }; 23 24 static int pli1209bc_read_word_data(struct i2c_client *client, int page, 25 int phase, int reg) 26 { 27 int data; 28 29 switch (reg) { 30 /* PMBUS_READ_POUT uses a direct format with R=0 */ 31 case PMBUS_READ_POUT: 32 data = pmbus_read_word_data(client, page, phase, reg); 33 if (data < 0) 34 return data; 35 data = sign_extend32(data, 15) * 10; 36 return clamp_val(data, -32768, 32767) & 0xffff; 37 /* 38 * PMBUS_READ_VOUT and PMBUS_READ_TEMPERATURE_1 return invalid data 39 * when the BCM is turned off. Since it is not possible to return 40 * ENODATA error, return zero instead. 41 */ 42 case PMBUS_READ_VOUT: 43 case PMBUS_READ_TEMPERATURE_1: 44 data = pmbus_read_word_data(client, page, phase, 45 PMBUS_STATUS_WORD); 46 if (data < 0) 47 return data; 48 if (data & PB_STATUS_POWER_GOOD_N) 49 return 0; 50 return pmbus_read_word_data(client, page, phase, reg); 51 default: 52 return -ENODATA; 53 } 54 } 55 56 #if IS_ENABLED(CONFIG_SENSORS_PLI1209BC_REGULATOR) 57 static const struct regulator_desc pli1209bc_reg_desc = { 58 .name = "vout2", 59 .id = 1, 60 .of_match = of_match_ptr("vout2"), 61 .regulators_node = of_match_ptr("regulators"), 62 .ops = &pmbus_regulator_ops, 63 .type = REGULATOR_VOLTAGE, 64 .owner = THIS_MODULE, 65 }; 66 #endif 67 68 static struct pmbus_driver_info pli1209bc_info = { 69 .pages = 2, 70 .format[PSC_VOLTAGE_IN] = direct, 71 .format[PSC_VOLTAGE_OUT] = direct, 72 .format[PSC_CURRENT_IN] = direct, 73 .format[PSC_CURRENT_OUT] = direct, 74 .format[PSC_POWER] = direct, 75 .format[PSC_TEMPERATURE] = direct, 76 .m[PSC_VOLTAGE_IN] = 1, 77 .b[PSC_VOLTAGE_IN] = 0, 78 .R[PSC_VOLTAGE_IN] = 1, 79 .m[PSC_VOLTAGE_OUT] = 1, 80 .b[PSC_VOLTAGE_OUT] = 0, 81 .R[PSC_VOLTAGE_OUT] = 1, 82 .m[PSC_CURRENT_IN] = 1, 83 .b[PSC_CURRENT_IN] = 0, 84 .R[PSC_CURRENT_IN] = 3, 85 .m[PSC_CURRENT_OUT] = 1, 86 .b[PSC_CURRENT_OUT] = 0, 87 .R[PSC_CURRENT_OUT] = 2, 88 .m[PSC_POWER] = 1, 89 .b[PSC_POWER] = 0, 90 .R[PSC_POWER] = 1, 91 .m[PSC_TEMPERATURE] = 1, 92 .b[PSC_TEMPERATURE] = 0, 93 .R[PSC_TEMPERATURE] = 0, 94 /* 95 * Page 0 sums up all attributes except voltage readings. 96 * The pli1209 digital supervisor only contains a single BCM, making 97 * page 0 redundant. 98 */ 99 .func[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT 100 | PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT 101 | PMBUS_HAVE_PIN | PMBUS_HAVE_POUT 102 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP 103 | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT, 104 .read_word_data = pli1209bc_read_word_data, 105 #if IS_ENABLED(CONFIG_SENSORS_PLI1209BC_REGULATOR) 106 .num_regulators = 1, 107 .reg_desc = &pli1209bc_reg_desc, 108 #endif 109 }; 110 111 static int pli1209bc_probe(struct i2c_client *client) 112 { 113 client->dev.platform_data = &pli1209bc_plat_data; 114 return pmbus_do_probe(client, &pli1209bc_info); 115 } 116 117 static const struct i2c_device_id pli1209bc_id[] = { 118 {"pli1209bc", 0}, 119 {} 120 }; 121 122 MODULE_DEVICE_TABLE(i2c, pli1209bc_id); 123 124 #ifdef CONFIG_OF 125 static const struct of_device_id pli1209bc_of_match[] = { 126 { .compatible = "vicor,pli1209bc" }, 127 { }, 128 }; 129 MODULE_DEVICE_TABLE(of, pli1209bc_of_match); 130 #endif 131 132 static struct i2c_driver pli1209bc_driver = { 133 .driver = { 134 .name = "pli1209bc", 135 .of_match_table = of_match_ptr(pli1209bc_of_match), 136 }, 137 .probe_new = pli1209bc_probe, 138 .id_table = pli1209bc_id, 139 }; 140 141 module_i2c_driver(pli1209bc_driver); 142 143 MODULE_AUTHOR("Marcello Sylvester Bauer <sylv@sylv.io>"); 144 MODULE_DESCRIPTION("PMBus driver for Vicor PLI1209BC"); 145 MODULE_LICENSE("GPL"); 146 MODULE_IMPORT_NS(PMBUS); 147