124 lines · c
1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Copyright 2023 IBM Corp.4 */5 6#include <linux/debugfs.h>7#include <linux/device.h>8#include <linux/fs.h>9#include <linux/i2c.h>10#include <linux/minmax.h>11#include <linux/module.h>12#include <linux/pmbus.h>13#include <linux/hwmon-sysfs.h>14#include "pmbus.h"15 16#define ACBEL_MFR_FW_REVISION 0xd917 18static ssize_t acbel_fsg032_debugfs_read(struct file *file, char __user *buf, size_t count,19 loff_t *ppos)20{21 struct i2c_client *client = file->private_data;22 u8 data[I2C_SMBUS_BLOCK_MAX + 2] = { 0 };23 char out[8];24 int rc;25 26 rc = i2c_smbus_read_block_data(client, ACBEL_MFR_FW_REVISION, data);27 if (rc < 0)28 return rc;29 30 rc = snprintf(out, sizeof(out), "%*phN\n", min(rc, 3), data);31 return simple_read_from_buffer(buf, count, ppos, out, rc);32}33 34static const struct file_operations acbel_debugfs_ops = {35 .llseek = noop_llseek,36 .read = acbel_fsg032_debugfs_read,37 .write = NULL,38 .open = simple_open,39};40 41static void acbel_fsg032_init_debugfs(struct i2c_client *client)42{43 struct dentry *debugfs = pmbus_get_debugfs_dir(client);44 45 if (!debugfs)46 return;47 48 debugfs_create_file("fw_version", 0444, debugfs, client, &acbel_debugfs_ops);49}50 51static const struct i2c_device_id acbel_fsg032_id[] = {52 { "acbel_fsg032" },53 {}54};55 56static struct pmbus_driver_info acbel_fsg032_info = {57 .pages = 1,58 .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_PIN |59 PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | PMBUS_HAVE_POUT |60 PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |61 PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_VOUT |62 PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_TEMP |63 PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_FAN12,64};65 66static int acbel_fsg032_probe(struct i2c_client *client)67{68 u8 buf[I2C_SMBUS_BLOCK_MAX + 1];69 struct device *dev = &client->dev;70 int rc;71 72 rc = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);73 if (rc < 0) {74 dev_err(dev, "Failed to read PMBUS_MFR_ID\n");75 return rc;76 }77 if (strncmp(buf, "ACBEL", 5)) {78 buf[rc] = '\0';79 dev_err(dev, "Manufacturer '%s' not supported\n", buf);80 return -ENODEV;81 }82 83 rc = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);84 if (rc < 0) {85 dev_err(dev, "Failed to read PMBUS_MFR_MODEL\n");86 return rc;87 }88 89 if (strncmp(buf, "FSG032", 6)) {90 buf[rc] = '\0';91 dev_err(dev, "Model '%s' not supported\n", buf);92 return -ENODEV;93 }94 95 rc = pmbus_do_probe(client, &acbel_fsg032_info);96 if (rc)97 return rc;98 99 acbel_fsg032_init_debugfs(client);100 return 0;101}102 103static const struct of_device_id acbel_fsg032_of_match[] = {104 { .compatible = "acbel,fsg032" },105 {}106};107MODULE_DEVICE_TABLE(of, acbel_fsg032_of_match);108 109static struct i2c_driver acbel_fsg032_driver = {110 .driver = {111 .name = "acbel-fsg032",112 .of_match_table = acbel_fsg032_of_match,113 },114 .probe = acbel_fsg032_probe,115 .id_table = acbel_fsg032_id,116};117 118module_i2c_driver(acbel_fsg032_driver);119 120MODULE_AUTHOR("Lakshmi Yadlapati");121MODULE_DESCRIPTION("PMBus driver for AcBel Power System power supplies");122MODULE_LICENSE("GPL");123MODULE_IMPORT_NS(PMBUS);124