drivers/hwmon/pmbus/acbel-fsg032.c

   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
  18 static 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
  34 static 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
  41 static 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
  51 static const struct i2c_device_id acbel_fsg032_id[] = {
  52         { "acbel_fsg032" },
  53         {}
  54 };
  55
  56 static 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
  66 static 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
 103 static const struct of_device_id acbel_fsg032_of_match[] = {
 104         { .compatible = "acbel,fsg032" },
 105         {}
 106 };
 107 MODULE_DEVICE_TABLE(of, acbel_fsg032_of_match);
 108
 109 static 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
 118 module_i2c_driver(acbel_fsg032_driver);
 119
 120 MODULE_AUTHOR("Lakshmi Yadlapati");
 121 MODULE_DESCRIPTION("PMBus driver for AcBel Power System power supplies");
 122 MODULE_LICENSE("GPL");
 123 MODULE_IMPORT_NS("PMBUS");