2 * MEN 14F021P00 Board Management Controller (BMC) hwmon driver.
4 * This is the core hwmon driver of the MEN 14F021P00 BMC.
5 * The BMC monitors the board voltages which can be access with this
6 * driver through sysfs.
8 * Copyright (C) 2014 MEN Mikro Elektronik Nuernberg GmbH
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation; either version 2 of the License, or (at your
13 * option) any later version.
16 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/platform_device.h>
19 #include <linux/hwmon.h>
20 #include <linux/hwmon-sysfs.h>
21 #include <linux/jiffies.h>
22 #include <linux/slab.h>
23 #include <linux/i2c.h>
24 #include <linux/err.h>
26 #define DRV_NAME "menf21bmc_hwmon"
28 #define BMC_VOLT_COUNT 5
29 #define MENF21BMC_V33 0
30 #define MENF21BMC_V5 1
31 #define MENF21BMC_V12 2
32 #define MENF21BMC_V5_SB 3
33 #define MENF21BMC_VBAT 4
35 #define IDX_TO_VOLT_MIN_CMD(idx) (0x40 + idx)
36 #define IDX_TO_VOLT_MAX_CMD(idx) (0x50 + idx)
37 #define IDX_TO_VOLT_INP_CMD(idx) (0x60 + idx)
39 struct menf21bmc_hwmon {
41 struct i2c_client *i2c_client;
42 unsigned long last_update;
43 int in_val[BMC_VOLT_COUNT];
44 int in_min[BMC_VOLT_COUNT];
45 int in_max[BMC_VOLT_COUNT];
48 static const char *const input_names[] = {
49 [MENF21BMC_V33] = "MON_3_3V",
50 [MENF21BMC_V5] = "MON_5V",
51 [MENF21BMC_V12] = "MON_12V",
52 [MENF21BMC_V5_SB] = "5V_STANDBY",
53 [MENF21BMC_VBAT] = "VBAT"
56 static struct menf21bmc_hwmon *menf21bmc_hwmon_update(struct device *dev)
60 struct menf21bmc_hwmon *drv_data = dev_get_drvdata(dev);
61 struct menf21bmc_hwmon *data_ret = drv_data;
63 if (time_after(jiffies, drv_data->last_update + HZ)
64 || !drv_data->valid) {
65 for (i = 0; i < BMC_VOLT_COUNT; i++) {
66 val = i2c_smbus_read_word_data(drv_data->i2c_client,
67 IDX_TO_VOLT_INP_CMD(i));
69 data_ret = ERR_PTR(val);
72 drv_data->in_val[i] = val;
74 drv_data->last_update = jiffies;
75 drv_data->valid = true;
81 static int menf21bmc_hwmon_get_volt_limits(struct menf21bmc_hwmon *drv_data)
85 for (i = 0; i < BMC_VOLT_COUNT; i++) {
86 val = i2c_smbus_read_word_data(drv_data->i2c_client,
87 IDX_TO_VOLT_MIN_CMD(i));
91 drv_data->in_min[i] = val;
93 val = i2c_smbus_read_word_data(drv_data->i2c_client,
94 IDX_TO_VOLT_MAX_CMD(i));
98 drv_data->in_max[i] = val;
104 label_show(struct device *dev, struct device_attribute *devattr, char *buf)
106 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
108 return sprintf(buf, "%s\n", input_names[attr->index]);
112 in_show(struct device *dev, struct device_attribute *devattr, char *buf)
114 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
115 struct menf21bmc_hwmon *drv_data = menf21bmc_hwmon_update(dev);
117 if (IS_ERR(drv_data))
118 return PTR_ERR(drv_data);
120 return sprintf(buf, "%d\n", drv_data->in_val[attr->index]);
124 min_show(struct device *dev, struct device_attribute *devattr, char *buf)
126 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
127 struct menf21bmc_hwmon *drv_data = dev_get_drvdata(dev);
129 return sprintf(buf, "%d\n", drv_data->in_min[attr->index]);
133 max_show(struct device *dev, struct device_attribute *devattr, char *buf)
135 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
136 struct menf21bmc_hwmon *drv_data = dev_get_drvdata(dev);
138 return sprintf(buf, "%d\n", drv_data->in_max[attr->index]);
141 static SENSOR_DEVICE_ATTR_RO(in0_input, in, 0);
142 static SENSOR_DEVICE_ATTR_RO(in0_min, min, 0);
143 static SENSOR_DEVICE_ATTR_RO(in0_max, max, 0);
144 static SENSOR_DEVICE_ATTR_RO(in0_label, label, 0);
145 static SENSOR_DEVICE_ATTR_RO(in1_input, in, 1);
146 static SENSOR_DEVICE_ATTR_RO(in1_min, min, 1);
147 static SENSOR_DEVICE_ATTR_RO(in1_max, max, 1);
148 static SENSOR_DEVICE_ATTR_RO(in1_label, label, 1);
149 static SENSOR_DEVICE_ATTR_RO(in2_input, in, 2);
150 static SENSOR_DEVICE_ATTR_RO(in2_min, min, 2);
151 static SENSOR_DEVICE_ATTR_RO(in2_max, max, 2);
152 static SENSOR_DEVICE_ATTR_RO(in2_label, label, 2);
153 static SENSOR_DEVICE_ATTR_RO(in3_input, in, 3);
154 static SENSOR_DEVICE_ATTR_RO(in3_min, min, 3);
155 static SENSOR_DEVICE_ATTR_RO(in3_max, max, 3);
156 static SENSOR_DEVICE_ATTR_RO(in3_label, label, 3);
157 static SENSOR_DEVICE_ATTR_RO(in4_input, in, 4);
158 static SENSOR_DEVICE_ATTR_RO(in4_min, min, 4);
159 static SENSOR_DEVICE_ATTR_RO(in4_max, max, 4);
160 static SENSOR_DEVICE_ATTR_RO(in4_label, label, 4);
162 static struct attribute *menf21bmc_hwmon_attrs[] = {
163 &sensor_dev_attr_in0_input.dev_attr.attr,
164 &sensor_dev_attr_in0_min.dev_attr.attr,
165 &sensor_dev_attr_in0_max.dev_attr.attr,
166 &sensor_dev_attr_in0_label.dev_attr.attr,
168 &sensor_dev_attr_in1_input.dev_attr.attr,
169 &sensor_dev_attr_in1_min.dev_attr.attr,
170 &sensor_dev_attr_in1_max.dev_attr.attr,
171 &sensor_dev_attr_in1_label.dev_attr.attr,
173 &sensor_dev_attr_in2_input.dev_attr.attr,
174 &sensor_dev_attr_in2_min.dev_attr.attr,
175 &sensor_dev_attr_in2_max.dev_attr.attr,
176 &sensor_dev_attr_in2_label.dev_attr.attr,
178 &sensor_dev_attr_in3_input.dev_attr.attr,
179 &sensor_dev_attr_in3_min.dev_attr.attr,
180 &sensor_dev_attr_in3_max.dev_attr.attr,
181 &sensor_dev_attr_in3_label.dev_attr.attr,
183 &sensor_dev_attr_in4_input.dev_attr.attr,
184 &sensor_dev_attr_in4_min.dev_attr.attr,
185 &sensor_dev_attr_in4_max.dev_attr.attr,
186 &sensor_dev_attr_in4_label.dev_attr.attr,
190 ATTRIBUTE_GROUPS(menf21bmc_hwmon);
192 static int menf21bmc_hwmon_probe(struct platform_device *pdev)
195 struct menf21bmc_hwmon *drv_data;
196 struct i2c_client *i2c_client = to_i2c_client(pdev->dev.parent);
197 struct device *hwmon_dev;
199 drv_data = devm_kzalloc(&pdev->dev, sizeof(struct menf21bmc_hwmon),
204 drv_data->i2c_client = i2c_client;
206 ret = menf21bmc_hwmon_get_volt_limits(drv_data);
208 dev_err(&pdev->dev, "failed to read sensor limits");
212 hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev,
213 "menf21bmc", drv_data,
214 menf21bmc_hwmon_groups);
215 if (IS_ERR(hwmon_dev))
216 return PTR_ERR(hwmon_dev);
218 dev_info(&pdev->dev, "MEN 14F021P00 BMC hwmon device enabled");
223 static struct platform_driver menf21bmc_hwmon = {
224 .probe = menf21bmc_hwmon_probe,
230 module_platform_driver(menf21bmc_hwmon);
232 MODULE_AUTHOR("Andreas Werner <andreas.werner@men.de>");
233 MODULE_DESCRIPTION("MEN 14F021P00 BMC hwmon");
234 MODULE_LICENSE("GPL v2");
235 MODULE_ALIAS("platform:menf21bmc_hwmon");