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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * MEN 14F021P00 Board Management Controller (BMC) hwmon driver.4 *5 * This is the core hwmon driver of the MEN 14F021P00 BMC.6 * The BMC monitors the board voltages which can be access with this7 * driver through sysfs.8 *9 * Copyright (C) 2014 MEN Mikro Elektronik Nuernberg GmbH10 */11 12#include <linux/module.h>13#include <linux/kernel.h>14#include <linux/platform_device.h>15#include <linux/hwmon.h>16#include <linux/hwmon-sysfs.h>17#include <linux/jiffies.h>18#include <linux/slab.h>19#include <linux/i2c.h>20#include <linux/err.h>21 22#define DRV_NAME "menf21bmc_hwmon"23 24#define BMC_VOLT_COUNT 525#define MENF21BMC_V33 026#define MENF21BMC_V5 127#define MENF21BMC_V12 228#define MENF21BMC_V5_SB 329#define MENF21BMC_VBAT 430 31#define IDX_TO_VOLT_MIN_CMD(idx) (0x40 + idx)32#define IDX_TO_VOLT_MAX_CMD(idx) (0x50 + idx)33#define IDX_TO_VOLT_INP_CMD(idx) (0x60 + idx)34 35struct menf21bmc_hwmon {36 bool valid;37 struct i2c_client *i2c_client;38 unsigned long last_update;39 int in_val[BMC_VOLT_COUNT];40 int in_min[BMC_VOLT_COUNT];41 int in_max[BMC_VOLT_COUNT];42};43 44static const char *const input_names[] = {45 [MENF21BMC_V33] = "MON_3_3V",46 [MENF21BMC_V5] = "MON_5V",47 [MENF21BMC_V12] = "MON_12V",48 [MENF21BMC_V5_SB] = "5V_STANDBY",49 [MENF21BMC_VBAT] = "VBAT"50};51 52static struct menf21bmc_hwmon *menf21bmc_hwmon_update(struct device *dev)53{54 int i;55 int val;56 struct menf21bmc_hwmon *drv_data = dev_get_drvdata(dev);57 struct menf21bmc_hwmon *data_ret = drv_data;58 59 if (time_after(jiffies, drv_data->last_update + HZ)60 || !drv_data->valid) {61 for (i = 0; i < BMC_VOLT_COUNT; i++) {62 val = i2c_smbus_read_word_data(drv_data->i2c_client,63 IDX_TO_VOLT_INP_CMD(i));64 if (val < 0) {65 data_ret = ERR_PTR(val);66 goto abort;67 }68 drv_data->in_val[i] = val;69 }70 drv_data->last_update = jiffies;71 drv_data->valid = true;72 }73abort:74 return data_ret;75}76 77static int menf21bmc_hwmon_get_volt_limits(struct menf21bmc_hwmon *drv_data)78{79 int i, val;80 81 for (i = 0; i < BMC_VOLT_COUNT; i++) {82 val = i2c_smbus_read_word_data(drv_data->i2c_client,83 IDX_TO_VOLT_MIN_CMD(i));84 if (val < 0)85 return val;86 87 drv_data->in_min[i] = val;88 89 val = i2c_smbus_read_word_data(drv_data->i2c_client,90 IDX_TO_VOLT_MAX_CMD(i));91 if (val < 0)92 return val;93 94 drv_data->in_max[i] = val;95 }96 return 0;97}98 99static ssize_t100label_show(struct device *dev, struct device_attribute *devattr, char *buf)101{102 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);103 104 return sprintf(buf, "%s\n", input_names[attr->index]);105}106 107static ssize_t108in_show(struct device *dev, struct device_attribute *devattr, char *buf)109{110 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);111 struct menf21bmc_hwmon *drv_data = menf21bmc_hwmon_update(dev);112 113 if (IS_ERR(drv_data))114 return PTR_ERR(drv_data);115 116 return sprintf(buf, "%d\n", drv_data->in_val[attr->index]);117}118 119static ssize_t120min_show(struct device *dev, struct device_attribute *devattr, char *buf)121{122 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);123 struct menf21bmc_hwmon *drv_data = dev_get_drvdata(dev);124 125 return sprintf(buf, "%d\n", drv_data->in_min[attr->index]);126}127 128static ssize_t129max_show(struct device *dev, struct device_attribute *devattr, char *buf)130{131 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);132 struct menf21bmc_hwmon *drv_data = dev_get_drvdata(dev);133 134 return sprintf(buf, "%d\n", drv_data->in_max[attr->index]);135}136 137static SENSOR_DEVICE_ATTR_RO(in0_input, in, 0);138static SENSOR_DEVICE_ATTR_RO(in0_min, min, 0);139static SENSOR_DEVICE_ATTR_RO(in0_max, max, 0);140static SENSOR_DEVICE_ATTR_RO(in0_label, label, 0);141static SENSOR_DEVICE_ATTR_RO(in1_input, in, 1);142static SENSOR_DEVICE_ATTR_RO(in1_min, min, 1);143static SENSOR_DEVICE_ATTR_RO(in1_max, max, 1);144static SENSOR_DEVICE_ATTR_RO(in1_label, label, 1);145static SENSOR_DEVICE_ATTR_RO(in2_input, in, 2);146static SENSOR_DEVICE_ATTR_RO(in2_min, min, 2);147static SENSOR_DEVICE_ATTR_RO(in2_max, max, 2);148static SENSOR_DEVICE_ATTR_RO(in2_label, label, 2);149static SENSOR_DEVICE_ATTR_RO(in3_input, in, 3);150static SENSOR_DEVICE_ATTR_RO(in3_min, min, 3);151static SENSOR_DEVICE_ATTR_RO(in3_max, max, 3);152static SENSOR_DEVICE_ATTR_RO(in3_label, label, 3);153static SENSOR_DEVICE_ATTR_RO(in4_input, in, 4);154static SENSOR_DEVICE_ATTR_RO(in4_min, min, 4);155static SENSOR_DEVICE_ATTR_RO(in4_max, max, 4);156static SENSOR_DEVICE_ATTR_RO(in4_label, label, 4);157 158static struct attribute *menf21bmc_hwmon_attrs[] = {159 &sensor_dev_attr_in0_input.dev_attr.attr,160 &sensor_dev_attr_in0_min.dev_attr.attr,161 &sensor_dev_attr_in0_max.dev_attr.attr,162 &sensor_dev_attr_in0_label.dev_attr.attr,163 164 &sensor_dev_attr_in1_input.dev_attr.attr,165 &sensor_dev_attr_in1_min.dev_attr.attr,166 &sensor_dev_attr_in1_max.dev_attr.attr,167 &sensor_dev_attr_in1_label.dev_attr.attr,168 169 &sensor_dev_attr_in2_input.dev_attr.attr,170 &sensor_dev_attr_in2_min.dev_attr.attr,171 &sensor_dev_attr_in2_max.dev_attr.attr,172 &sensor_dev_attr_in2_label.dev_attr.attr,173 174 &sensor_dev_attr_in3_input.dev_attr.attr,175 &sensor_dev_attr_in3_min.dev_attr.attr,176 &sensor_dev_attr_in3_max.dev_attr.attr,177 &sensor_dev_attr_in3_label.dev_attr.attr,178 179 &sensor_dev_attr_in4_input.dev_attr.attr,180 &sensor_dev_attr_in4_min.dev_attr.attr,181 &sensor_dev_attr_in4_max.dev_attr.attr,182 &sensor_dev_attr_in4_label.dev_attr.attr,183 NULL184};185 186ATTRIBUTE_GROUPS(menf21bmc_hwmon);187 188static int menf21bmc_hwmon_probe(struct platform_device *pdev)189{190 int ret;191 struct menf21bmc_hwmon *drv_data;192 struct i2c_client *i2c_client = to_i2c_client(pdev->dev.parent);193 struct device *hwmon_dev;194 195 drv_data = devm_kzalloc(&pdev->dev, sizeof(struct menf21bmc_hwmon),196 GFP_KERNEL);197 if (!drv_data)198 return -ENOMEM;199 200 drv_data->i2c_client = i2c_client;201 202 ret = menf21bmc_hwmon_get_volt_limits(drv_data);203 if (ret) {204 dev_err(&pdev->dev, "failed to read sensor limits");205 return ret;206 }207 208 hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev,209 "menf21bmc", drv_data,210 menf21bmc_hwmon_groups);211 if (IS_ERR(hwmon_dev))212 return PTR_ERR(hwmon_dev);213 214 dev_info(&pdev->dev, "MEN 14F021P00 BMC hwmon device enabled");215 216 return 0;217}218 219static struct platform_driver menf21bmc_hwmon = {220 .probe = menf21bmc_hwmon_probe,221 .driver = {222 .name = DRV_NAME,223 },224};225 226module_platform_driver(menf21bmc_hwmon);227 228MODULE_AUTHOR("Andreas Werner <andreas.werner@men.de>");229MODULE_DESCRIPTION("MEN 14F021P00 BMC hwmon");230MODULE_LICENSE("GPL v2");231MODULE_ALIAS("platform:menf21bmc_hwmon");232