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linux/drivers/hwmon/menf21bmc_hwmon.c
Thomas Gleixner 2874c5fd28 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:32 -07:00

232 lines
6.3 KiB
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* MEN 14F021P00 Board Management Controller (BMC) hwmon driver.
*
* This is the core hwmon driver of the MEN 14F021P00 BMC.
* The BMC monitors the board voltages which can be access with this
* driver through sysfs.
*
* Copyright (C) 2014 MEN Mikro Elektronik Nuernberg GmbH
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/jiffies.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/err.h>
#define DRV_NAME "menf21bmc_hwmon"
#define BMC_VOLT_COUNT 5
#define MENF21BMC_V33 0
#define MENF21BMC_V5 1
#define MENF21BMC_V12 2
#define MENF21BMC_V5_SB 3
#define MENF21BMC_VBAT 4
#define IDX_TO_VOLT_MIN_CMD(idx) (0x40 + idx)
#define IDX_TO_VOLT_MAX_CMD(idx) (0x50 + idx)
#define IDX_TO_VOLT_INP_CMD(idx) (0x60 + idx)
struct menf21bmc_hwmon {
bool valid;
struct i2c_client *i2c_client;
unsigned long last_update;
int in_val[BMC_VOLT_COUNT];
int in_min[BMC_VOLT_COUNT];
int in_max[BMC_VOLT_COUNT];
};
static const char *const input_names[] = {
[MENF21BMC_V33] = "MON_3_3V",
[MENF21BMC_V5] = "MON_5V",
[MENF21BMC_V12] = "MON_12V",
[MENF21BMC_V5_SB] = "5V_STANDBY",
[MENF21BMC_VBAT] = "VBAT"
};
static struct menf21bmc_hwmon *menf21bmc_hwmon_update(struct device *dev)
{
int i;
int val;
struct menf21bmc_hwmon *drv_data = dev_get_drvdata(dev);
struct menf21bmc_hwmon *data_ret = drv_data;
if (time_after(jiffies, drv_data->last_update + HZ)
|| !drv_data->valid) {
for (i = 0; i < BMC_VOLT_COUNT; i++) {
val = i2c_smbus_read_word_data(drv_data->i2c_client,
IDX_TO_VOLT_INP_CMD(i));
if (val < 0) {
data_ret = ERR_PTR(val);
goto abort;
}
drv_data->in_val[i] = val;
}
drv_data->last_update = jiffies;
drv_data->valid = true;
}
abort:
return data_ret;
}
static int menf21bmc_hwmon_get_volt_limits(struct menf21bmc_hwmon *drv_data)
{
int i, val;
for (i = 0; i < BMC_VOLT_COUNT; i++) {
val = i2c_smbus_read_word_data(drv_data->i2c_client,
IDX_TO_VOLT_MIN_CMD(i));
if (val < 0)
return val;
drv_data->in_min[i] = val;
val = i2c_smbus_read_word_data(drv_data->i2c_client,
IDX_TO_VOLT_MAX_CMD(i));
if (val < 0)
return val;
drv_data->in_max[i] = val;
}
return 0;
}
static ssize_t
label_show(struct device *dev, struct device_attribute *devattr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
return sprintf(buf, "%s\n", input_names[attr->index]);
}
static ssize_t
in_show(struct device *dev, struct device_attribute *devattr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct menf21bmc_hwmon *drv_data = menf21bmc_hwmon_update(dev);
if (IS_ERR(drv_data))
return PTR_ERR(drv_data);
return sprintf(buf, "%d\n", drv_data->in_val[attr->index]);
}
static ssize_t
min_show(struct device *dev, struct device_attribute *devattr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct menf21bmc_hwmon *drv_data = dev_get_drvdata(dev);
return sprintf(buf, "%d\n", drv_data->in_min[attr->index]);
}
static ssize_t
max_show(struct device *dev, struct device_attribute *devattr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct menf21bmc_hwmon *drv_data = dev_get_drvdata(dev);
return sprintf(buf, "%d\n", drv_data->in_max[attr->index]);
}
static SENSOR_DEVICE_ATTR_RO(in0_input, in, 0);
static SENSOR_DEVICE_ATTR_RO(in0_min, min, 0);
static SENSOR_DEVICE_ATTR_RO(in0_max, max, 0);
static SENSOR_DEVICE_ATTR_RO(in0_label, label, 0);
static SENSOR_DEVICE_ATTR_RO(in1_input, in, 1);
static SENSOR_DEVICE_ATTR_RO(in1_min, min, 1);
static SENSOR_DEVICE_ATTR_RO(in1_max, max, 1);
static SENSOR_DEVICE_ATTR_RO(in1_label, label, 1);
static SENSOR_DEVICE_ATTR_RO(in2_input, in, 2);
static SENSOR_DEVICE_ATTR_RO(in2_min, min, 2);
static SENSOR_DEVICE_ATTR_RO(in2_max, max, 2);
static SENSOR_DEVICE_ATTR_RO(in2_label, label, 2);
static SENSOR_DEVICE_ATTR_RO(in3_input, in, 3);
static SENSOR_DEVICE_ATTR_RO(in3_min, min, 3);
static SENSOR_DEVICE_ATTR_RO(in3_max, max, 3);
static SENSOR_DEVICE_ATTR_RO(in3_label, label, 3);
static SENSOR_DEVICE_ATTR_RO(in4_input, in, 4);
static SENSOR_DEVICE_ATTR_RO(in4_min, min, 4);
static SENSOR_DEVICE_ATTR_RO(in4_max, max, 4);
static SENSOR_DEVICE_ATTR_RO(in4_label, label, 4);
static struct attribute *menf21bmc_hwmon_attrs[] = {
&sensor_dev_attr_in0_input.dev_attr.attr,
&sensor_dev_attr_in0_min.dev_attr.attr,
&sensor_dev_attr_in0_max.dev_attr.attr,
&sensor_dev_attr_in0_label.dev_attr.attr,
&sensor_dev_attr_in1_input.dev_attr.attr,
&sensor_dev_attr_in1_min.dev_attr.attr,
&sensor_dev_attr_in1_max.dev_attr.attr,
&sensor_dev_attr_in1_label.dev_attr.attr,
&sensor_dev_attr_in2_input.dev_attr.attr,
&sensor_dev_attr_in2_min.dev_attr.attr,
&sensor_dev_attr_in2_max.dev_attr.attr,
&sensor_dev_attr_in2_label.dev_attr.attr,
&sensor_dev_attr_in3_input.dev_attr.attr,
&sensor_dev_attr_in3_min.dev_attr.attr,
&sensor_dev_attr_in3_max.dev_attr.attr,
&sensor_dev_attr_in3_label.dev_attr.attr,
&sensor_dev_attr_in4_input.dev_attr.attr,
&sensor_dev_attr_in4_min.dev_attr.attr,
&sensor_dev_attr_in4_max.dev_attr.attr,
&sensor_dev_attr_in4_label.dev_attr.attr,
NULL
};
ATTRIBUTE_GROUPS(menf21bmc_hwmon);
static int menf21bmc_hwmon_probe(struct platform_device *pdev)
{
int ret;
struct menf21bmc_hwmon *drv_data;
struct i2c_client *i2c_client = to_i2c_client(pdev->dev.parent);
struct device *hwmon_dev;
drv_data = devm_kzalloc(&pdev->dev, sizeof(struct menf21bmc_hwmon),
GFP_KERNEL);
if (!drv_data)
return -ENOMEM;
drv_data->i2c_client = i2c_client;
ret = menf21bmc_hwmon_get_volt_limits(drv_data);
if (ret) {
dev_err(&pdev->dev, "failed to read sensor limits");
return ret;
}
hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev,
"menf21bmc", drv_data,
menf21bmc_hwmon_groups);
if (IS_ERR(hwmon_dev))
return PTR_ERR(hwmon_dev);
dev_info(&pdev->dev, "MEN 14F021P00 BMC hwmon device enabled");
return 0;
}
static struct platform_driver menf21bmc_hwmon = {
.probe = menf21bmc_hwmon_probe,
.driver = {
.name = DRV_NAME,
},
};
module_platform_driver(menf21bmc_hwmon);
MODULE_AUTHOR("Andreas Werner <andreas.werner@men.de>");
MODULE_DESCRIPTION("MEN 14F021P00 BMC hwmon");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:menf21bmc_hwmon");
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