Immutable branch between MFD, HWMON, LEDs and Watchdog for v3.18
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Guenter Roeck
commit
7ad8966f4f
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@ -0,0 +1,50 @@
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Kernel driver menf21bmc_hwmon
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=============================
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Supported chips:
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* MEN 14F021P00
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Prefix: 'menf21bmc_hwmon'
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Adresses scanned: -
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Author: Andreas Werner <andreas.werner@men.de>
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Description
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-----------
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The menf21bmc is a Board Management Controller (BMC) which provides an I2C
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interface to the host to access the features implemented in the BMC.
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This driver gives access to the voltage monitoring feature of the main
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voltages of the board.
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The voltage sensors are connected to the ADC inputs of the BMC which is
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a PIC16F917 Mikrocontroller.
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Usage Notes
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-----------
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This driver is part of the MFD driver named "menf21bmc" and does
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not auto-detect devices.
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You will have to instantiate the MFD driver explicitly.
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Please see Documentation/i2c/instantiating-devices for
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details.
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Sysfs entries
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-------------
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The following attributes are supported. All attributes are read only
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The Limits are read once by the driver.
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in0_input +3.3V input voltage
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in1_input +5.0V input voltage
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in2_input +12.0V input voltage
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in3_input +5V Standby input voltage
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in4_input VBAT (on board battery)
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in[0-4]_min Minimum voltage limit
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in[0-4]_max Maximum voltage limit
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in0_label "MON_3_3V"
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in1_label "MON_5V"
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in2_label "MON_12V"
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in3_label "5V_STANDBY"
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in4_label "VBAT"
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@ -839,6 +839,16 @@ config SENSORS_MCP3021
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This driver can also be built as a module. If so, the module
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will be called mcp3021.
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config SENSORS_MENF21BMC_HWMON
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tristate "MEN 14F021P00 BMC Hardware Monitoring"
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depends on MFD_MENF21BMC
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help
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Say Y here to include support for the MEN 14F021P00 BMC
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hardware monitoring.
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This driver can also be built as a module. If so the module
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will be called menf21bmc_hwmon.
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config SENSORS_ADCXX
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tristate "National Semiconductor ADCxxxSxxx"
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depends on SPI_MASTER
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@ -115,6 +115,7 @@ obj-$(CONFIG_SENSORS_MAX6650) += max6650.o
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obj-$(CONFIG_SENSORS_MAX6697) += max6697.o
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obj-$(CONFIG_SENSORS_MC13783_ADC)+= mc13783-adc.o
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obj-$(CONFIG_SENSORS_MCP3021) += mcp3021.o
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obj-$(CONFIG_SENSORS_MENF21BMC_HWMON) += menf21bmc_hwmon.o
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obj-$(CONFIG_SENSORS_NCT6683) += nct6683.o
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obj-$(CONFIG_SENSORS_NCT6775) += nct6775.o
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obj-$(CONFIG_SENSORS_NTC_THERMISTOR) += ntc_thermistor.o
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@ -0,0 +1,230 @@
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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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#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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.owner = THIS_MODULE,
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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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@ -468,6 +468,15 @@ config LEDS_OT200
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This option enables support for the LEDs on the Bachmann OT200.
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Say Y to enable LEDs on the Bachmann OT200.
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config LEDS_MENF21BMC
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tristate "LED support for the MEN 14F021P00 BMC"
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depends on LEDS_CLASS && MFD_MENF21BMC
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help
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Say Y here to include support for the MEN 14F021P00 BMC LEDs.
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This driver can also be built as a module. If so the module
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will be called leds-menf21bmc.
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comment "LED driver for blink(1) USB RGB LED is under Special HID drivers (HID_THINGM)"
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config LEDS_BLINKM
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@ -54,6 +54,7 @@ obj-$(CONFIG_LEDS_MAX8997) += leds-max8997.o
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obj-$(CONFIG_LEDS_LM355x) += leds-lm355x.o
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obj-$(CONFIG_LEDS_BLINKM) += leds-blinkm.o
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obj-$(CONFIG_LEDS_VERSATILE) += leds-versatile.o
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obj-$(CONFIG_LEDS_MENF21BMC) += leds-menf21bmc.o
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# LED SPI Drivers
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obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o
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|
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@ -0,0 +1,131 @@
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/*
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* MEN 14F021P00 Board Management Controller (BMC) LEDs Driver.
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*
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* This is the core LED driver of the MEN 14F021P00 BMC.
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* There are four LEDs available which can be switched on and off.
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* STATUS LED, HOT SWAP LED, USER LED 1, USER LED 2
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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
|
||||
* 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.
|
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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/leds.h>
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#include <linux/i2c.h>
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#define BMC_CMD_LED_GET_SET 0xA0
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#define BMC_BIT_LED_STATUS BIT(0)
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#define BMC_BIT_LED_HOTSWAP BIT(1)
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#define BMC_BIT_LED_USER1 BIT(2)
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#define BMC_BIT_LED_USER2 BIT(3)
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struct menf21bmc_led {
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struct led_classdev cdev;
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u8 led_bit;
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const char *name;
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struct i2c_client *i2c_client;
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};
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static struct menf21bmc_led leds[] = {
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{
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.name = "menf21bmc:led_status",
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.led_bit = BMC_BIT_LED_STATUS,
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},
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{
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.name = "menf21bmc:led_hotswap",
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.led_bit = BMC_BIT_LED_HOTSWAP,
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},
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{
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.name = "menf21bmc:led_user1",
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.led_bit = BMC_BIT_LED_USER1,
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},
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{
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.name = "menf21bmc:led_user2",
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.led_bit = BMC_BIT_LED_USER2,
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}
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};
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static DEFINE_MUTEX(led_lock);
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static void
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menf21bmc_led_set(struct led_classdev *led_cdev, enum led_brightness value)
|
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{
|
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int led_val;
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struct menf21bmc_led *led = container_of(led_cdev,
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struct menf21bmc_led, cdev);
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mutex_lock(&led_lock);
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led_val = i2c_smbus_read_byte_data(led->i2c_client,
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BMC_CMD_LED_GET_SET);
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if (led_val < 0)
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goto err_out;
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|
||||
if (value == LED_OFF)
|
||||
led_val &= ~led->led_bit;
|
||||
else
|
||||
led_val |= led->led_bit;
|
||||
|
||||
i2c_smbus_write_byte_data(led->i2c_client,
|
||||
BMC_CMD_LED_GET_SET, led_val);
|
||||
err_out:
|
||||
mutex_unlock(&led_lock);
|
||||
}
|
||||
|
||||
static int menf21bmc_led_probe(struct platform_device *pdev)
|
||||
{
|
||||
int i;
|
||||
int ret;
|
||||
struct i2c_client *i2c_client = to_i2c_client(pdev->dev.parent);
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(leds); i++) {
|
||||
leds[i].cdev.name = leds[i].name;
|
||||
leds[i].cdev.brightness_set = menf21bmc_led_set;
|
||||
leds[i].i2c_client = i2c_client;
|
||||
ret = led_classdev_register(&pdev->dev, &leds[i].cdev);
|
||||
if (ret < 0)
|
||||
goto err_free_leds;
|
||||
}
|
||||
dev_info(&pdev->dev, "MEN 140F21P00 BMC LED device enabled\n");
|
||||
|
||||
return 0;
|
||||
|
||||
err_free_leds:
|
||||
dev_err(&pdev->dev, "failed to register LED device\n");
|
||||
|
||||
for (i = i - 1; i >= 0; i--)
|
||||
led_classdev_unregister(&leds[i].cdev);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int menf21bmc_led_remove(struct platform_device *pdev)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(leds); i++)
|
||||
led_classdev_unregister(&leds[i].cdev);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct platform_driver menf21bmc_led = {
|
||||
.probe = menf21bmc_led_probe,
|
||||
.remove = menf21bmc_led_remove,
|
||||
.driver = {
|
||||
.name = "menf21bmc_led",
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
};
|
||||
|
||||
module_platform_driver(menf21bmc_led);
|
||||
|
||||
MODULE_AUTHOR("Andreas Werner <andreas.werner@men.de>");
|
||||
MODULE_DESCRIPTION("MEN 14F021P00 BMC led driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
MODULE_ALIAS("platform:menf21bmc_led");
|
||||
|
|
@ -454,6 +454,21 @@ config MFD_MAX8998
|
|||
additional drivers must be enabled in order to use the functionality
|
||||
of the device.
|
||||
|
||||
config MFD_MENF21BMC
|
||||
tristate "MEN 14F021P00 Board Management Controller Support"
|
||||
depends on I2C
|
||||
select MFD_CORE
|
||||
help
|
||||
Say yes here to add support for the MEN 14F021P00 BMC
|
||||
which is a Board Management Controller connected to the I2C bus.
|
||||
The device supports multiple sub-devices like LED, HWMON and WDT.
|
||||
This driver provides common support for accessing the devices;
|
||||
additional drivers must be enabled in order to use the
|
||||
functionality of the BMC device.
|
||||
|
||||
This driver can also be built as a module. If so the module
|
||||
will be called menf21bmc.
|
||||
|
||||
config EZX_PCAP
|
||||
bool "Motorola EZXPCAP Support"
|
||||
depends on SPI_MASTER
|
||||
|
|
|
|||
|
|
@ -169,6 +169,7 @@ obj-$(CONFIG_MFD_AS3711) += as3711.o
|
|||
obj-$(CONFIG_MFD_AS3722) += as3722.o
|
||||
obj-$(CONFIG_MFD_STW481X) += stw481x.o
|
||||
obj-$(CONFIG_MFD_IPAQ_MICRO) += ipaq-micro.o
|
||||
obj-$(CONFIG_MFD_MENF21BMC) += menf21bmc.o
|
||||
|
||||
intel-soc-pmic-objs := intel_soc_pmic_core.o intel_soc_pmic_crc.o
|
||||
obj-$(CONFIG_INTEL_SOC_PMIC) += intel-soc-pmic.o
|
||||
|
|
|
|||
|
|
@ -0,0 +1,132 @@
|
|||
/*
|
||||
* MEN 14F021P00 Board Management Controller (BMC) MFD Core Driver.
|
||||
*
|
||||
* 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/kernel.h>
|
||||
#include <linux/device.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/i2c.h>
|
||||
#include <linux/mfd/core.h>
|
||||
|
||||
#define BMC_CMD_WDT_EXIT_PROD 0x18
|
||||
#define BMC_CMD_WDT_PROD_STAT 0x19
|
||||
#define BMC_CMD_REV_MAJOR 0x80
|
||||
#define BMC_CMD_REV_MINOR 0x81
|
||||
#define BMC_CMD_REV_MAIN 0x82
|
||||
|
||||
static struct mfd_cell menf21bmc_cell[] = {
|
||||
{ .name = "menf21bmc_wdt", },
|
||||
{ .name = "menf21bmc_led", },
|
||||
{ .name = "menf21bmc_hwmon", }
|
||||
};
|
||||
|
||||
static int menf21bmc_wdt_exit_prod_mode(struct i2c_client *client)
|
||||
{
|
||||
int val, ret;
|
||||
|
||||
val = i2c_smbus_read_byte_data(client, BMC_CMD_WDT_PROD_STAT);
|
||||
if (val < 0)
|
||||
return val;
|
||||
|
||||
/*
|
||||
* Production mode should be not active after delivery of the Board.
|
||||
* To be sure we check it, inform the user and exit the mode
|
||||
* if active.
|
||||
*/
|
||||
if (val == 0x00) {
|
||||
dev_info(&client->dev,
|
||||
"BMC in production mode. Exit production mode\n");
|
||||
|
||||
ret = i2c_smbus_write_byte(client, BMC_CMD_WDT_EXIT_PROD);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
menf21bmc_probe(struct i2c_client *client, const struct i2c_device_id *ids)
|
||||
{
|
||||
int rev_major, rev_minor, rev_main;
|
||||
int ret;
|
||||
|
||||
ret = i2c_check_functionality(client->adapter,
|
||||
I2C_FUNC_SMBUS_BYTE_DATA |
|
||||
I2C_FUNC_SMBUS_WORD_DATA |
|
||||
I2C_FUNC_SMBUS_BYTE);
|
||||
if (!ret)
|
||||
return -ENODEV;
|
||||
|
||||
rev_major = i2c_smbus_read_word_data(client, BMC_CMD_REV_MAJOR);
|
||||
if (rev_major < 0) {
|
||||
dev_err(&client->dev, "failed to get BMC major revision\n");
|
||||
return rev_major;
|
||||
}
|
||||
|
||||
rev_minor = i2c_smbus_read_word_data(client, BMC_CMD_REV_MINOR);
|
||||
if (rev_minor < 0) {
|
||||
dev_err(&client->dev, "failed to get BMC minor revision\n");
|
||||
return rev_minor;
|
||||
}
|
||||
|
||||
rev_main = i2c_smbus_read_word_data(client, BMC_CMD_REV_MAIN);
|
||||
if (rev_main < 0) {
|
||||
dev_err(&client->dev, "failed to get BMC main revision\n");
|
||||
return rev_main;
|
||||
}
|
||||
|
||||
dev_info(&client->dev, "FW Revision: %02d.%02d.%02d\n",
|
||||
rev_major, rev_minor, rev_main);
|
||||
|
||||
/*
|
||||
* We have to exit the Production Mode of the BMC to activate the
|
||||
* Watchdog functionality and the BIOS life sign monitoring.
|
||||
*/
|
||||
ret = menf21bmc_wdt_exit_prod_mode(client);
|
||||
if (ret < 0) {
|
||||
dev_err(&client->dev, "failed to leave production mode\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
ret = mfd_add_devices(&client->dev, 0, menf21bmc_cell,
|
||||
ARRAY_SIZE(menf21bmc_cell), NULL, 0, NULL);
|
||||
if (ret < 0) {
|
||||
dev_err(&client->dev, "failed to add BMC sub-devices\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int menf21bmc_remove(struct i2c_client *client)
|
||||
{
|
||||
mfd_remove_devices(&client->dev);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct i2c_device_id menf21bmc_id_table[] = {
|
||||
{ "menf21bmc" },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(i2c, menf21bmc_id_table);
|
||||
|
||||
static struct i2c_driver menf21bmc_driver = {
|
||||
.driver.name = "menf21bmc",
|
||||
.id_table = menf21bmc_id_table,
|
||||
.probe = menf21bmc_probe,
|
||||
.remove = menf21bmc_remove,
|
||||
};
|
||||
|
||||
module_i2c_driver(menf21bmc_driver);
|
||||
|
||||
MODULE_DESCRIPTION("MEN 14F021P00 BMC mfd core driver");
|
||||
MODULE_AUTHOR("Andreas Werner <andreas.werner@men.de>");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
|
|
@ -95,6 +95,16 @@ config GPIO_WATCHDOG
|
|||
If you say yes here you get support for watchdog device
|
||||
controlled through GPIO-line.
|
||||
|
||||
config MENF21BMC_WATCHDOG
|
||||
tristate "MEN 14F021P00 BMC Watchdog"
|
||||
depends on MFD_MENF21BMC
|
||||
select WATCHDOG_CORE
|
||||
help
|
||||
Say Y here to include support for the MEN 14F021P00 BMC Watchdog.
|
||||
|
||||
This driver can also be built as a module. If so the module
|
||||
will be called menf21bmc_wdt.
|
||||
|
||||
config WM831X_WATCHDOG
|
||||
tristate "WM831x watchdog"
|
||||
depends on MFD_WM831X
|
||||
|
|
|
|||
|
|
@ -178,3 +178,4 @@ obj-$(CONFIG_WM831X_WATCHDOG) += wm831x_wdt.o
|
|||
obj-$(CONFIG_WM8350_WATCHDOG) += wm8350_wdt.o
|
||||
obj-$(CONFIG_MAX63XX_WATCHDOG) += max63xx_wdt.o
|
||||
obj-$(CONFIG_SOFT_WATCHDOG) += softdog.o
|
||||
obj-$(CONFIG_MENF21BMC_WATCHDOG) += menf21bmc_wdt.o
|
||||
|
|
|
|||
|
|
@ -0,0 +1,203 @@
|
|||
/*
|
||||
* MEN 14F021P00 Board Management Controller (BMC) Watchdog Driver.
|
||||
*
|
||||
* 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/kernel.h>
|
||||
#include <linux/device.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/watchdog.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/i2c.h>
|
||||
|
||||
#define DEVNAME "menf21bmc_wdt"
|
||||
|
||||
#define BMC_CMD_WD_ON 0x11
|
||||
#define BMC_CMD_WD_OFF 0x12
|
||||
#define BMC_CMD_WD_TRIG 0x13
|
||||
#define BMC_CMD_WD_TIME 0x14
|
||||
#define BMC_CMD_WD_STATE 0x17
|
||||
#define BMC_WD_OFF_VAL 0x69
|
||||
#define BMC_CMD_RST_RSN 0x92
|
||||
|
||||
#define BMC_WD_TIMEOUT_MIN 1 /* in sec */
|
||||
#define BMC_WD_TIMEOUT_MAX 6553 /* in sec */
|
||||
|
||||
static bool nowayout = WATCHDOG_NOWAYOUT;
|
||||
module_param(nowayout, bool, 0);
|
||||
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
|
||||
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
|
||||
|
||||
struct menf21bmc_wdt {
|
||||
struct watchdog_device wdt;
|
||||
struct i2c_client *i2c_client;
|
||||
};
|
||||
|
||||
static int menf21bmc_wdt_set_bootstatus(struct menf21bmc_wdt *data)
|
||||
{
|
||||
int rst_rsn;
|
||||
|
||||
rst_rsn = i2c_smbus_read_byte_data(data->i2c_client, BMC_CMD_RST_RSN);
|
||||
if (rst_rsn < 0)
|
||||
return rst_rsn;
|
||||
|
||||
if (rst_rsn == 0x02)
|
||||
data->wdt.bootstatus |= WDIOF_CARDRESET;
|
||||
else if (rst_rsn == 0x05)
|
||||
data->wdt.bootstatus |= WDIOF_EXTERN1;
|
||||
else if (rst_rsn == 0x06)
|
||||
data->wdt.bootstatus |= WDIOF_EXTERN2;
|
||||
else if (rst_rsn == 0x0A)
|
||||
data->wdt.bootstatus |= WDIOF_POWERUNDER;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int menf21bmc_wdt_start(struct watchdog_device *wdt)
|
||||
{
|
||||
struct menf21bmc_wdt *drv_data = watchdog_get_drvdata(wdt);
|
||||
|
||||
return i2c_smbus_write_byte(drv_data->i2c_client, BMC_CMD_WD_ON);
|
||||
}
|
||||
|
||||
static int menf21bmc_wdt_stop(struct watchdog_device *wdt)
|
||||
{
|
||||
struct menf21bmc_wdt *drv_data = watchdog_get_drvdata(wdt);
|
||||
|
||||
return i2c_smbus_write_byte_data(drv_data->i2c_client,
|
||||
BMC_CMD_WD_OFF, BMC_WD_OFF_VAL);
|
||||
}
|
||||
|
||||
static int
|
||||
menf21bmc_wdt_settimeout(struct watchdog_device *wdt, unsigned int timeout)
|
||||
{
|
||||
int ret;
|
||||
struct menf21bmc_wdt *drv_data = watchdog_get_drvdata(wdt);
|
||||
|
||||
/*
|
||||
* BMC Watchdog does have a resolution of 100ms.
|
||||
* Watchdog API defines the timeout in seconds, so we have to
|
||||
* multiply the value.
|
||||
*/
|
||||
ret = i2c_smbus_write_word_data(drv_data->i2c_client,
|
||||
BMC_CMD_WD_TIME, timeout * 10);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
wdt->timeout = timeout;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int menf21bmc_wdt_ping(struct watchdog_device *wdt)
|
||||
{
|
||||
struct menf21bmc_wdt *drv_data = watchdog_get_drvdata(wdt);
|
||||
|
||||
return i2c_smbus_write_byte(drv_data->i2c_client, BMC_CMD_WD_TRIG);
|
||||
}
|
||||
|
||||
static const struct watchdog_info menf21bmc_wdt_info = {
|
||||
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
|
||||
.identity = DEVNAME,
|
||||
};
|
||||
|
||||
static const struct watchdog_ops menf21bmc_wdt_ops = {
|
||||
.owner = THIS_MODULE,
|
||||
.start = menf21bmc_wdt_start,
|
||||
.stop = menf21bmc_wdt_stop,
|
||||
.ping = menf21bmc_wdt_ping,
|
||||
.set_timeout = menf21bmc_wdt_settimeout,
|
||||
};
|
||||
|
||||
static int menf21bmc_wdt_probe(struct platform_device *pdev)
|
||||
{
|
||||
int ret, bmc_timeout;
|
||||
struct menf21bmc_wdt *drv_data;
|
||||
struct i2c_client *i2c_client = to_i2c_client(pdev->dev.parent);
|
||||
|
||||
drv_data = devm_kzalloc(&pdev->dev,
|
||||
sizeof(struct menf21bmc_wdt), GFP_KERNEL);
|
||||
if (!drv_data)
|
||||
return -ENOMEM;
|
||||
|
||||
drv_data->wdt.ops = &menf21bmc_wdt_ops;
|
||||
drv_data->wdt.info = &menf21bmc_wdt_info;
|
||||
drv_data->wdt.min_timeout = BMC_WD_TIMEOUT_MIN;
|
||||
drv_data->wdt.max_timeout = BMC_WD_TIMEOUT_MAX;
|
||||
drv_data->i2c_client = i2c_client;
|
||||
|
||||
/*
|
||||
* Get the current wdt timeout value from the BMC because
|
||||
* the BMC will save the value set before if the system restarts.
|
||||
*/
|
||||
bmc_timeout = i2c_smbus_read_word_data(drv_data->i2c_client,
|
||||
BMC_CMD_WD_TIME);
|
||||
if (bmc_timeout < 0) {
|
||||
dev_err(&pdev->dev, "failed to get current WDT timeout\n");
|
||||
return bmc_timeout;
|
||||
}
|
||||
|
||||
watchdog_init_timeout(&drv_data->wdt, bmc_timeout / 10, &pdev->dev);
|
||||
watchdog_set_nowayout(&drv_data->wdt, nowayout);
|
||||
watchdog_set_drvdata(&drv_data->wdt, drv_data);
|
||||
platform_set_drvdata(pdev, drv_data);
|
||||
|
||||
ret = menf21bmc_wdt_set_bootstatus(drv_data);
|
||||
if (ret < 0) {
|
||||
dev_err(&pdev->dev, "failed to set Watchdog bootstatus\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
ret = watchdog_register_device(&drv_data->wdt);
|
||||
if (ret) {
|
||||
dev_err(&pdev->dev, "failed to register Watchdog device\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
dev_info(&pdev->dev, "MEN 14F021P00 BMC Watchdog device enabled\n");
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int menf21bmc_wdt_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct menf21bmc_wdt *drv_data = platform_get_drvdata(pdev);
|
||||
|
||||
dev_warn(&pdev->dev,
|
||||
"Unregister MEN 14F021P00 BMC Watchdog device, board may reset\n");
|
||||
|
||||
watchdog_unregister_device(&drv_data->wdt);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void menf21bmc_wdt_shutdown(struct platform_device *pdev)
|
||||
{
|
||||
struct menf21bmc_wdt *drv_data = platform_get_drvdata(pdev);
|
||||
|
||||
i2c_smbus_write_word_data(drv_data->i2c_client,
|
||||
BMC_CMD_WD_OFF, BMC_WD_OFF_VAL);
|
||||
}
|
||||
|
||||
static struct platform_driver menf21bmc_wdt = {
|
||||
.driver = {
|
||||
.owner = THIS_MODULE,
|
||||
.name = DEVNAME,
|
||||
},
|
||||
.probe = menf21bmc_wdt_probe,
|
||||
.remove = menf21bmc_wdt_remove,
|
||||
.shutdown = menf21bmc_wdt_shutdown,
|
||||
};
|
||||
|
||||
module_platform_driver(menf21bmc_wdt);
|
||||
|
||||
MODULE_DESCRIPTION("MEN 14F021P00 BMC Watchdog driver");
|
||||
MODULE_AUTHOR("Andreas Werner <andreas.werner@men.de>");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
MODULE_ALIAS("platform:menf21bmc_wdt");
|
||||
Loading…
Reference in New Issue