149 lines · c
1// SPDX-License-Identifier: GPL-2.0+2/*3 * Hardware monitoring driver for Vicor PLI1209BC Digital Supervisor4 *5 * Copyright (c) 2022 9elements GmbH6 */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 while17 * the page register is set to 1 will falsely enable PEC support. Disable18 * capability probing accordingly, since the PLI1209BC does not have any19 * additional capabilities.20 */21static struct pmbus_platform_data pli1209bc_plat_data = {22 .flags = PMBUS_NO_CAPABILITY,23};24 25static 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 data40 * when the BCM is turned off. Since it is not possible to return41 * 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)58static 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#endif68 69static 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, making98 * page 0 redundant.99 */100 .func[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT101 | PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT102 | PMBUS_HAVE_PIN | PMBUS_HAVE_POUT103 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP104 | 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#endif111};112 113static 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 119static const struct i2c_device_id pli1209bc_id[] = {120 {"pli1209bc"},121 {}122};123 124MODULE_DEVICE_TABLE(i2c, pli1209bc_id);125 126#ifdef CONFIG_OF127static const struct of_device_id pli1209bc_of_match[] = {128 { .compatible = "vicor,pli1209bc" },129 { },130};131MODULE_DEVICE_TABLE(of, pli1209bc_of_match);132#endif133 134static 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 143module_i2c_driver(pli1209bc_driver);144 145MODULE_AUTHOR("Marcello Sylvester Bauer <sylv@sylv.io>");146MODULE_DESCRIPTION("PMBus driver for Vicor PLI1209BC");147MODULE_LICENSE("GPL");148MODULE_IMPORT_NS(PMBUS);149