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Immutable branch between MFD, HWMON, LEDs and Watchdog for v3.18

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Merge tag 'mfd-hwmon-leds-watchdog-v3.18' into devel

Immutable branch between MFD, HWMON, LEDs and Watchdog for v3.18
This commit is contained in:
Bryan Wu 2014-09-24 11:02:57 -07:00
commit 0a2b4a843d
13 changed files with 794 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

50
Documentation/hwmon/menf21bmc Normal file
View File

@ -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"

10
drivers/hwmon/Kconfig
View File

@ -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

1
drivers/hwmon/Makefile
View File

@ -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

230
drivers/hwmon/menf21bmc_hwmon.c Normal file
View File

@ -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");

9
drivers/leds/Kconfig
View File

@ -468,6 +468,15 @@ config LEDS_OT200
This option enables support for the LEDs on the Bachmann OT200.
Say Y to enable LEDs on the Bachmann OT200.
config LEDS_MENF21BMC
tristate "LED support for the MEN 14F021P00 BMC"
depends on LEDS_CLASS && MFD_MENF21BMC
help
Say Y here to include support for the MEN 14F021P00 BMC LEDs.
This driver can also be built as a module. If so the module
will be called leds-menf21bmc.
comment "LED driver for blink(1) USB RGB LED is under Special HID drivers (HID_THINGM)"
config LEDS_BLINKM

1
drivers/leds/Makefile
View File

@ -54,6 +54,7 @@ obj-$(CONFIG_LEDS_MAX8997) += leds-max8997.o
obj-$(CONFIG_LEDS_LM355x) += leds-lm355x.o
obj-$(CONFIG_LEDS_BLINKM) += leds-blinkm.o
obj-$(CONFIG_LEDS_VERSATILE) += leds-versatile.o
obj-$(CONFIG_LEDS_MENF21BMC) += leds-menf21bmc.o
# LED SPI Drivers
obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o

131
drivers/leds/leds-menf21bmc.c Normal file
View File

@ -0,0 +1,131 @@
/*
* MEN 14F021P00 Board Management Controller (BMC) LEDs Driver.
*
* This is the core LED driver of the MEN 14F021P00 BMC.
* There are four LEDs available which can be switched on and off.
* STATUS LED, HOT SWAP LED, USER LED 1, USER LED 2
*
* 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/leds.h>
#include <linux/i2c.h>
#define BMC_CMD_LED_GET_SET 0xA0
#define BMC_BIT_LED_STATUS BIT(0)
#define BMC_BIT_LED_HOTSWAP BIT(1)
#define BMC_BIT_LED_USER1 BIT(2)
#define BMC_BIT_LED_USER2 BIT(3)
struct menf21bmc_led {
struct led_classdev cdev;
u8 led_bit;
const char *name;
struct i2c_client *i2c_client;
};
static struct menf21bmc_led leds[] = {
{
.name = "menf21bmc:led_status",
.led_bit = BMC_BIT_LED_STATUS,
},
{
.name = "menf21bmc:led_hotswap",
.led_bit = BMC_BIT_LED_HOTSWAP,
},
{
.name = "menf21bmc:led_user1",
.led_bit = BMC_BIT_LED_USER1,
},
{
.name = "menf21bmc:led_user2",
.led_bit = BMC_BIT_LED_USER2,
}
};
static DEFINE_MUTEX(led_lock);
static void
menf21bmc_led_set(struct led_classdev *led_cdev, enum led_brightness value)
{
int led_val;
struct menf21bmc_led *led = container_of(led_cdev,
struct menf21bmc_led, cdev);
mutex_lock(&led_lock);
led_val = i2c_smbus_read_byte_data(led->i2c_client,
BMC_CMD_LED_GET_SET);
if (led_val < 0)
goto err_out;
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");

15
drivers/mfd/Kconfig
View File

@ -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

1
drivers/mfd/Makefile
View File

@ -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

132
drivers/mfd/menf21bmc.c Normal file
View File

@ -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");

10
drivers/watchdog/Kconfig
View File

@ -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

1
drivers/watchdog/Makefile
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@ -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

203
drivers/watchdog/menf21bmc_wdt.c Normal file
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@ -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");