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1// SPDX-License-Identifier: GPL-2.0+2/*3 * Hardware monitoring driver for BEL PFE family power supplies.4 *5 * Copyright (c) 2019 Facebook Inc.6 */7 8#include <linux/err.h>9#include <linux/i2c.h>10#include <linux/init.h>11#include <linux/kernel.h>12#include <linux/module.h>13#include <linux/pmbus.h>14 15#include "pmbus.h"16 17enum chips {pfe1100, pfe3000};18 19/*20 * Disable status check because some devices report communication error21 * (invalid command) for VOUT_MODE command (0x20) although the correct22 * VOUT_MODE (0x16) is returned: it leads to incorrect exponent in linear23 * mode.24 * This affects both pfe3000 and pfe1100.25 */26static struct pmbus_platform_data pfe_plat_data = {27 .flags = PMBUS_SKIP_STATUS_CHECK,28};29 30static struct pmbus_driver_info pfe_driver_info[] = {31 [pfe1100] = {32 .pages = 1,33 .format[PSC_VOLTAGE_IN] = linear,34 .format[PSC_VOLTAGE_OUT] = linear,35 .format[PSC_CURRENT_IN] = linear,36 .format[PSC_CURRENT_OUT] = linear,37 .format[PSC_POWER] = linear,38 .format[PSC_TEMPERATURE] = linear,39 .format[PSC_FAN] = linear,40 41 .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |42 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |43 PMBUS_HAVE_POUT |44 PMBUS_HAVE_VIN | PMBUS_HAVE_IIN |45 PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |46 PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 |47 PMBUS_HAVE_STATUS_TEMP |48 PMBUS_HAVE_FAN12,49 },50 51 [pfe3000] = {52 .pages = 7,53 .format[PSC_VOLTAGE_IN] = linear,54 .format[PSC_VOLTAGE_OUT] = linear,55 .format[PSC_CURRENT_IN] = linear,56 .format[PSC_CURRENT_OUT] = linear,57 .format[PSC_POWER] = linear,58 .format[PSC_TEMPERATURE] = linear,59 .format[PSC_FAN] = linear,60 61 /* Page 0: V1. */62 .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |63 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |64 PMBUS_HAVE_POUT | PMBUS_HAVE_FAN12 |65 PMBUS_HAVE_VIN | PMBUS_HAVE_IIN |66 PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |67 PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 |68 PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_TEMP |69 PMBUS_HAVE_VCAP,70 71 /* Page 1: Vsb. */72 .func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |73 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |74 PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |75 PMBUS_HAVE_POUT,76 77 /*78 * Page 2: V1 Ishare.79 * Page 3: Reserved.80 * Page 4: V1 Cathode.81 * Page 5: Vsb Cathode.82 * Page 6: V1 Sense.83 */84 .func[2] = PMBUS_HAVE_VOUT,85 .func[4] = PMBUS_HAVE_VOUT,86 .func[5] = PMBUS_HAVE_VOUT,87 .func[6] = PMBUS_HAVE_VOUT,88 },89};90 91static const struct i2c_device_id pfe_device_id[];92 93static int pfe_pmbus_probe(struct i2c_client *client)94{95 int model;96 97 model = (int)i2c_match_id(pfe_device_id, client)->driver_data;98 client->dev.platform_data = &pfe_plat_data;99 100 /*101 * PFE3000-12-069RA devices may not stay in page 0 during device102 * probe which leads to probe failure (read status word failed).103 * So let's set the device to page 0 at the beginning.104 */105 if (model == pfe3000)106 i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0);107 108 return pmbus_do_probe(client, &pfe_driver_info[model]);109}110 111static const struct i2c_device_id pfe_device_id[] = {112 {"pfe1100", pfe1100},113 {"pfe3000", pfe3000},114 {}115};116 117MODULE_DEVICE_TABLE(i2c, pfe_device_id);118 119static struct i2c_driver pfe_pmbus_driver = {120 .driver = {121 .name = "bel-pfe",122 },123 .probe = pfe_pmbus_probe,124 .id_table = pfe_device_id,125};126 127module_i2c_driver(pfe_pmbus_driver);128 129MODULE_AUTHOR("Tao Ren <rentao.bupt@gmail.com>");130MODULE_DESCRIPTION("PMBus driver for BEL PFE Family Power Supplies");131MODULE_LICENSE("GPL");132MODULE_IMPORT_NS(PMBUS);133