diff options
| -rw-r--r-- | Documentation/hwmon/menf21bmc | 50 | ||||
| -rw-r--r-- | drivers/hwmon/Kconfig | 10 | ||||
| -rw-r--r-- | drivers/hwmon/Makefile | 1 | ||||
| -rw-r--r-- | drivers/hwmon/menf21bmc_hwmon.c | 230 |
4 files changed, 291 insertions, 0 deletions
diff --git a/Documentation/hwmon/menf21bmc b/Documentation/hwmon/menf21bmc new file mode 100644 index 000000000000..2a273a065c5e --- /dev/null +++ b/Documentation/hwmon/menf21bmc @@ -0,0 +1,50 @@ +Kernel driver menf21bmc_hwmon +============================= + +Supported chips: + * MEN 14F021P00 + Prefix: 'menf21bmc_hwmon' + Adresses scanned: - + +Author: Andreas Werner <andreas.werner@men.de> + +Description +----------- + +The menf21bmc is a Board Management Controller (BMC) which provides an I2C +interface to the host to access the features implemented in the BMC. + +This driver gives access to the voltage monitoring feature of the main +voltages of the board. +The voltage sensors are connected to the ADC inputs of the BMC which is +a PIC16F917 Mikrocontroller. + +Usage Notes +----------- + +This driver is part of the MFD driver named "menf21bmc" and does +not auto-detect devices. +You will have to instantiate the MFD driver explicitly. +Please see Documentation/i2c/instantiating-devices for +details. + +Sysfs entries +------------- + +The following attributes are supported. All attributes are read only +The Limits are read once by the driver. + +in0_input +3.3V input voltage +in1_input +5.0V input voltage +in2_input +12.0V input voltage +in3_input +5V Standby input voltage +in4_input VBAT (on board battery) + +in[0-4]_min Minimum voltage limit +in[0-4]_max Maximum voltage limit + +in0_label "MON_3_3V" +in1_label "MON_5V" +in2_label "MON_12V" +in3_label "5V_STANDBY" +in4_label "VBAT" diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index f00d048aa583..c08d172bbab4 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -839,6 +839,16 @@ config SENSORS_MCP3021 This driver can also be built as a module. If so, the module will be called mcp3021. +config SENSORS_MENF21BMC_HWMON + tristate "MEN 14F021P00 BMC Hardware Monitoring" + depends on MFD_MENF21BMC + help + Say Y here to include support for the MEN 14F021P00 BMC + hardware monitoring. + + This driver can also be built as a module. If so the module + will be called menf21bmc_hwmon. + config SENSORS_ADCXX tristate "National Semiconductor ADCxxxSxxx" depends on SPI_MASTER diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index be28152c9848..c90a7611efaa 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -115,6 +115,7 @@ obj-$(CONFIG_SENSORS_MAX6650) += max6650.o obj-$(CONFIG_SENSORS_MAX6697) += max6697.o obj-$(CONFIG_SENSORS_MC13783_ADC)+= mc13783-adc.o obj-$(CONFIG_SENSORS_MCP3021) += mcp3021.o +obj-$(CONFIG_SENSORS_MENF21BMC_HWMON) += menf21bmc_hwmon.o obj-$(CONFIG_SENSORS_NCT6683) += nct6683.o obj-$(CONFIG_SENSORS_NCT6775) += nct6775.o obj-$(CONFIG_SENSORS_NTC_THERMISTOR) += ntc_thermistor.o diff --git a/drivers/hwmon/menf21bmc_hwmon.c b/drivers/hwmon/menf21bmc_hwmon.c new file mode 100644 index 000000000000..c92229d321c9 --- /dev/null +++ b/drivers/hwmon/menf21bmc_hwmon.c @@ -0,0 +1,230 @@ +/* + * 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> + +#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\n", 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\n", 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\n", 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\n", 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, + .owner = THIS_MODULE, + }, +}; + +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"); |
