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hwmon: (pmbus/acbel-fsg032) Add firmware version debugfs attribute 

Like the IBM CFFPS driver, export the PSU's firmware version to a
debugfs attribute as reported in the manufacturer register.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
Link: https://lore.kernel.org/r/20230628153453.122213-1-eajames@linux.ibm.com
[groeck: Dropped unused variable; changed buffer from char to u8]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Eddie James 2023-06-28 10:34:53 -05:00 committed by Guenter Roeck
parent 4a754aba0b
commit c15a8edd63
1 changed files with 38 additions and 0 deletions
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38
drivers/hwmon/pmbus/acbel-fsg032.c
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@ -3,14 +3,51 @@
* Copyright 2023 IBM Corp. * Copyright 2023 IBM Corp.
*/ */
#include <linux/debugfs.h>
#include <linux/device.h> #include <linux/device.h>
#include <linux/fs.h> #include <linux/fs.h>
#include <linux/i2c.h> #include <linux/i2c.h>
#include <linux/minmax.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/pmbus.h> #include <linux/pmbus.h>
#include <linux/hwmon-sysfs.h> #include <linux/hwmon-sysfs.h>
#include "pmbus.h" #include "pmbus.h"
#define ACBEL_MFR_FW_REVISION 0xd9
static ssize_t acbel_fsg032_debugfs_read(struct file *file, char __user *buf, size_t count,
loff_t *ppos)
{
struct i2c_client *client = file->private_data;
u8 data[I2C_SMBUS_BLOCK_MAX + 2] = { 0 };
char out[8];
int rc;
rc = i2c_smbus_read_block_data(client, ACBEL_MFR_FW_REVISION, data);
if (rc < 0)
return rc;
rc = snprintf(out, sizeof(out), "%*phN\n", min(rc, 3), data);
return simple_read_from_buffer(buf, count, ppos, out, rc);
}
static const struct file_operations acbel_debugfs_ops = {
.llseek = noop_llseek,
.read = acbel_fsg032_debugfs_read,
.write = NULL,
.open = simple_open,
};
static void acbel_fsg032_init_debugfs(struct i2c_client *client)
{
struct dentry *debugfs = pmbus_get_debugfs_dir(client);
if (!debugfs)
return;
debugfs_create_file("fw_version", 0444, debugfs, client, &acbel_debugfs_ops);
}
static const struct i2c_device_id acbel_fsg032_id[] = { static const struct i2c_device_id acbel_fsg032_id[] = {
{ "acbel_fsg032" }, { "acbel_fsg032" },
{} {}
@ -59,6 +96,7 @@ static int acbel_fsg032_probe(struct i2c_client *client)
if (rc) if (rc)
return rc; return rc;
acbel_fsg032_init_debugfs(client);
return 0; return 0;
} }