231 lines
6.1 KiB
C
231 lines
6.1 KiB
C
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/*
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* MEN 14F021P00 Board Management Controller (BMC) hwmon driver.
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*
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* This is the core hwmon driver of the MEN 14F021P00 BMC.
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* The BMC monitors the board voltages which can be access with this
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* driver through sysfs.
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*
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* Copyright (C) 2014 MEN Mikro Elektronik Nuernberg GmbH
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/platform_device.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/jiffies.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/err.h>
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#define DRV_NAME "menf21bmc_hwmon"
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#define BMC_VOLT_COUNT 5
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#define MENF21BMC_V33 0
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#define MENF21BMC_V5 1
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#define MENF21BMC_V12 2
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#define MENF21BMC_V5_SB 3
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#define MENF21BMC_VBAT 4
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#define IDX_TO_VOLT_MIN_CMD(idx) (0x40 + idx)
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#define IDX_TO_VOLT_MAX_CMD(idx) (0x50 + idx)
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#define IDX_TO_VOLT_INP_CMD(idx) (0x60 + idx)
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struct menf21bmc_hwmon {
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bool valid;
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struct i2c_client *i2c_client;
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unsigned long last_update;
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int in_val[BMC_VOLT_COUNT];
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int in_min[BMC_VOLT_COUNT];
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int in_max[BMC_VOLT_COUNT];
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};
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static const char *const input_names[] = {
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[MENF21BMC_V33] = "MON_3_3V",
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[MENF21BMC_V5] = "MON_5V",
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[MENF21BMC_V12] = "MON_12V",
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[MENF21BMC_V5_SB] = "5V_STANDBY",
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[MENF21BMC_VBAT] = "VBAT"
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};
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static struct menf21bmc_hwmon *menf21bmc_hwmon_update(struct device *dev)
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{
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int i;
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int val;
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struct menf21bmc_hwmon *drv_data = dev_get_drvdata(dev);
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struct menf21bmc_hwmon *data_ret = drv_data;
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if (time_after(jiffies, drv_data->last_update + HZ)
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|| !drv_data->valid) {
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for (i = 0; i < BMC_VOLT_COUNT; i++) {
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val = i2c_smbus_read_word_data(drv_data->i2c_client,
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IDX_TO_VOLT_INP_CMD(i));
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if (val < 0) {
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data_ret = ERR_PTR(val);
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goto abort;
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}
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drv_data->in_val[i] = val;
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}
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drv_data->last_update = jiffies;
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drv_data->valid = true;
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}
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abort:
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return data_ret;
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}
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static int menf21bmc_hwmon_get_volt_limits(struct menf21bmc_hwmon *drv_data)
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{
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int i, val;
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for (i = 0; i < BMC_VOLT_COUNT; i++) {
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val = i2c_smbus_read_word_data(drv_data->i2c_client,
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IDX_TO_VOLT_MIN_CMD(i));
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if (val < 0)
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return val;
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drv_data->in_min[i] = val;
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val = i2c_smbus_read_word_data(drv_data->i2c_client,
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IDX_TO_VOLT_MAX_CMD(i));
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if (val < 0)
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return val;
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drv_data->in_max[i] = val;
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}
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return 0;
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}
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static ssize_t
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show_label(struct device *dev, struct device_attribute *devattr, char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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return sprintf(buf, "%s\n", input_names[attr->index]);
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}
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static ssize_t
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show_in(struct device *dev, struct device_attribute *devattr, char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct menf21bmc_hwmon *drv_data = menf21bmc_hwmon_update(dev);
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if (IS_ERR(drv_data))
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return PTR_ERR(drv_data);
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return sprintf(buf, "%d\n", drv_data->in_val[attr->index]);
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}
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static ssize_t
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show_min(struct device *dev, struct device_attribute *devattr, char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct menf21bmc_hwmon *drv_data = dev_get_drvdata(dev);
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return sprintf(buf, "%d\n", drv_data->in_min[attr->index]);
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}
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static ssize_t
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show_max(struct device *dev, struct device_attribute *devattr, char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct menf21bmc_hwmon *drv_data = dev_get_drvdata(dev);
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return sprintf(buf, "%d\n", drv_data->in_max[attr->index]);
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}
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#define create_voltage_sysfs(idx) \
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static SENSOR_DEVICE_ATTR(in##idx##_input, S_IRUGO, \
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show_in, NULL, idx); \
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static SENSOR_DEVICE_ATTR(in##idx##_min, S_IRUGO, \
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show_min, NULL, idx); \
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static SENSOR_DEVICE_ATTR(in##idx##_max, S_IRUGO, \
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show_max, NULL, idx); \
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static SENSOR_DEVICE_ATTR(in##idx##_label, S_IRUGO, \
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show_label, NULL, idx);
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create_voltage_sysfs(0);
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create_voltage_sysfs(1);
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create_voltage_sysfs(2);
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create_voltage_sysfs(3);
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create_voltage_sysfs(4);
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static struct attribute *menf21bmc_hwmon_attrs[] = {
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&sensor_dev_attr_in0_input.dev_attr.attr,
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&sensor_dev_attr_in0_min.dev_attr.attr,
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&sensor_dev_attr_in0_max.dev_attr.attr,
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&sensor_dev_attr_in0_label.dev_attr.attr,
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&sensor_dev_attr_in1_input.dev_attr.attr,
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&sensor_dev_attr_in1_min.dev_attr.attr,
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&sensor_dev_attr_in1_max.dev_attr.attr,
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&sensor_dev_attr_in1_label.dev_attr.attr,
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&sensor_dev_attr_in2_input.dev_attr.attr,
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&sensor_dev_attr_in2_min.dev_attr.attr,
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&sensor_dev_attr_in2_max.dev_attr.attr,
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&sensor_dev_attr_in2_label.dev_attr.attr,
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&sensor_dev_attr_in3_input.dev_attr.attr,
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&sensor_dev_attr_in3_min.dev_attr.attr,
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&sensor_dev_attr_in3_max.dev_attr.attr,
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&sensor_dev_attr_in3_label.dev_attr.attr,
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&sensor_dev_attr_in4_input.dev_attr.attr,
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&sensor_dev_attr_in4_min.dev_attr.attr,
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&sensor_dev_attr_in4_max.dev_attr.attr,
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&sensor_dev_attr_in4_label.dev_attr.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(menf21bmc_hwmon);
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static int menf21bmc_hwmon_probe(struct platform_device *pdev)
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{
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int ret;
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struct menf21bmc_hwmon *drv_data;
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struct i2c_client *i2c_client = to_i2c_client(pdev->dev.parent);
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struct device *hwmon_dev;
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drv_data = devm_kzalloc(&pdev->dev, sizeof(struct menf21bmc_hwmon),
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GFP_KERNEL);
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if (!drv_data)
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return -ENOMEM;
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drv_data->i2c_client = i2c_client;
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ret = menf21bmc_hwmon_get_volt_limits(drv_data);
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if (ret) {
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dev_err(&pdev->dev, "failed to read sensor limits");
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return ret;
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}
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hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev,
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"menf21bmc", drv_data,
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menf21bmc_hwmon_groups);
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if (IS_ERR(hwmon_dev))
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return PTR_ERR(hwmon_dev);
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dev_info(&pdev->dev, "MEN 14F021P00 BMC hwmon device enabled");
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return 0;
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}
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static struct platform_driver menf21bmc_hwmon = {
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.probe = menf21bmc_hwmon_probe,
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.driver = {
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.name = DRV_NAME,
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},
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};
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module_platform_driver(menf21bmc_hwmon);
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MODULE_AUTHOR("Andreas Werner <andreas.werner@men.de>");
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MODULE_DESCRIPTION("MEN 14F021P00 BMC hwmon");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:menf21bmc_hwmon");
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