1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  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	0xd9
 17
 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);