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/delay.h> 9 #include <linux/i2c.h> 10 #include <linux/module.h> 11 #include <linux/pmbus.h> 12 #include <linux/regulator/driver.h> 13 #include "pmbus.h" 14 15 /* 16 * The capability command is only supported at page 0. Probing the device while 17 * the page register is set to 1 will falsely enable PEC support. Disable 18 * capability probing accordingly, since the PLI1209BC does not have any 19 * additional capabilities. 20 */ 21 static struct pmbus_platform_data pli1209bc_plat_data = { 22 .flags = PMBUS_NO_CAPABILITY, 23 }; 24 25 static int pli1209bc_read_word_data(struct i2c_client *client, int page, 26 int phase, int reg) 27 { 28 int data; 29 30 switch (reg) { 31 /* PMBUS_READ_POUT uses a direct format with R=0 */ 32 case PMBUS_READ_POUT: 33 data = pmbus_read_word_data(client, page, phase, reg); 34 if (data < 0) 35 return data; 36 data = sign_extend32(data, 15) * 10; 37 return clamp_val(data, -32768, 32767) & 0xffff; 38 /* 39 * PMBUS_READ_VOUT and PMBUS_READ_TEMPERATURE_1 return invalid data 40 * when the BCM is turned off. Since it is not possible to return 41 * ENODATA error, return zero instead. 42 */ 43 case PMBUS_READ_VOUT: 44 case PMBUS_READ_TEMPERATURE_1: 45 data = pmbus_read_word_data(client, page, phase, 46 PMBUS_STATUS_WORD); 47 if (data < 0) 48 return data; 49 if (data & PB_STATUS_POWER_GOOD_N) 50 return 0; 51 return pmbus_read_word_data(client, page, phase, reg); 52 default: 53 return -ENODATA; 54 } 55 } 56 57 #if IS_ENABLED(CONFIG_SENSORS_PLI1209BC_REGULATOR) 58 static const struct regulator_desc pli1209bc_reg_desc = { 59 .name = "vout2", 60 .id = 1, 61 .of_match = of_match_ptr("vout2"), 62 .regulators_node = of_match_ptr("regulators"), 63 .ops = &pmbus_regulator_ops, 64 .type = REGULATOR_VOLTAGE, 65 .owner = THIS_MODULE, 66 }; 67 #endif 68 69 static struct pmbus_driver_info pli1209bc_info = { 70 .pages = 2, 71 .format[PSC_VOLTAGE_IN] = direct, 72 .format[PSC_VOLTAGE_OUT] = direct, 73 .format[PSC_CURRENT_IN] = direct, 74 .format[PSC_CURRENT_OUT] = direct, 75 .format[PSC_POWER] = direct, 76 .format[PSC_TEMPERATURE] = direct, 77 .m[PSC_VOLTAGE_IN] = 1, 78 .b[PSC_VOLTAGE_IN] = 0, 79 .R[PSC_VOLTAGE_IN] = 1, 80 .m[PSC_VOLTAGE_OUT] = 1, 81 .b[PSC_VOLTAGE_OUT] = 0, 82 .R[PSC_VOLTAGE_OUT] = 1, 83 .m[PSC_CURRENT_IN] = 1, 84 .b[PSC_CURRENT_IN] = 0, 85 .R[PSC_CURRENT_IN] = 3, 86 .m[PSC_CURRENT_OUT] = 1, 87 .b[PSC_CURRENT_OUT] = 0, 88 .R[PSC_CURRENT_OUT] = 2, 89 .m[PSC_POWER] = 1, 90 .b[PSC_POWER] = 0, 91 .R[PSC_POWER] = 1, 92 .m[PSC_TEMPERATURE] = 1, 93 .b[PSC_TEMPERATURE] = 0, 94 .R[PSC_TEMPERATURE] = 0, 95 /* 96 * Page 0 sums up all attributes except voltage readings. 97 * The pli1209 digital supervisor only contains a single BCM, making 98 * page 0 redundant. 99 */ 100 .func[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT 101 | PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT 102 | PMBUS_HAVE_PIN | PMBUS_HAVE_POUT 103 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP 104 | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT, 105 .read_word_data = pli1209bc_read_word_data, 106 .write_delay = 250, 107 #if IS_ENABLED(CONFIG_SENSORS_PLI1209BC_REGULATOR) 108 .num_regulators = 1, 109 .reg_desc = &pli1209bc_reg_desc, 110 #endif 111 }; 112 113 static int pli1209bc_probe(struct i2c_client *client) 114 { 115 client->dev.platform_data = &pli1209bc_plat_data; 116 return pmbus_do_probe(client, &pli1209bc_info); 117 } 118 119 static const struct i2c_device_id pli1209bc_id[] = { 120 {"pli1209bc"}, 121 {} 122 }; 123 124 MODULE_DEVICE_TABLE(i2c, pli1209bc_id); 125 126 #ifdef CONFIG_OF 127 static const struct of_device_id pli1209bc_of_match[] = { 128 { .compatible = "vicor,pli1209bc" }, 129 { }, 130 }; 131 MODULE_DEVICE_TABLE(of, pli1209bc_of_match); 132 #endif 133 134 static struct i2c_driver pli1209bc_driver = { 135 .driver = { 136 .name = "pli1209bc", 137 .of_match_table = of_match_ptr(pli1209bc_of_match), 138 }, 139 .probe = pli1209bc_probe, 140 .id_table = pli1209bc_id, 141 }; 142 143 module_i2c_driver(pli1209bc_driver); 144 145 MODULE_AUTHOR("Marcello Sylvester Bauer <sylv@sylv.io>"); 146 MODULE_DESCRIPTION("PMBus driver for Vicor PLI1209BC"); 147 MODULE_LICENSE("GPL"); 148 MODULE_IMPORT_NS(PMBUS); 149