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drivers/hwmon/menf21bmc_hwmon.c 6.09 KB
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964356938   Andreas Werner   hwmon: (menf21bmc... 
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  /*
   *  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
   *
   *  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.
   */
  
  #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>
3d5960472   Johannes Thumshirn   hwmon: (menf21bmc... 
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  #include <linux/err.h>
964356938   Andreas Werner   hwmon: (menf21bmc... 
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  #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
  show_label(struct device *dev, struct device_attribute *devattr, char *buf)
  {
  	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
  
  	return sprintf(buf, "%s
  ", input_names[attr->index]);
  }
  
  static ssize_t
  show_in(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
  ", drv_data->in_val[attr->index]);
  }
  
  static ssize_t
  show_min(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
  ", drv_data->in_min[attr->index]);
  }
  
  static ssize_t
  show_max(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
  ", drv_data->in_max[attr->index]);
  }
  
  #define create_voltage_sysfs(idx)			\
  static SENSOR_DEVICE_ATTR(in##idx##_input, S_IRUGO,	\
  			show_in, NULL, idx);		\
  static SENSOR_DEVICE_ATTR(in##idx##_min, S_IRUGO,	\
  			show_min, NULL, idx);		\
  static SENSOR_DEVICE_ATTR(in##idx##_max, S_IRUGO,	\
  			show_max, NULL, idx);		\
  static SENSOR_DEVICE_ATTR(in##idx##_label, S_IRUGO,	\
  			show_label, NULL, idx);
  
  create_voltage_sysfs(0);
  create_voltage_sysfs(1);
  create_voltage_sysfs(2);
  create_voltage_sysfs(3);
  create_voltage_sysfs(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,
964356938   Andreas Werner   hwmon: (menf21bmc... 
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  	},
  };
  
  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");