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Date: Tue, 27 May 2014 11:06:27 +0200
From: Andreas Werner <andreas.werner@....de>
To: <linux-kernel@...r.kernel.org>
CC: <sameo@...ux.intel.com>, <lee.jones@...aro.org>, <wim@...ana.be>,
<linux-watchdog@...r.kernel.org>, <cooloney@...il.com>,
<rpurdie@...ys.net>, <linux-leds@...r.kernel.org>,
<johannes.thumshirn@....de>, <andreas.werner@....de>
Subject: [PATCH v2 1/3] drivers/mfd/menf21bmc: introduce MEN 14F021P00 BMC
MFD Core driver
The MEN 14F021P00 Board Management Controller provides an
I2C interface to the host to access the feature implemented in the BMC.
The BMC is a PIC Microntroller assembled on CPCI Card from MEN Mikroelektronik
and on a few Box/Display Computer.
Added MFD Core driver, supporting the I2C communication to the device.
The MFD driver currently supports the following features:
- Watchdog
- LEDs
Signed-off-by: Andreas Werner <andreas.werner@....de>
---
drivers/mfd/Kconfig | 12 +++
drivers/mfd/Makefile | 1 +
drivers/mfd/menf21bmc.c | 220 ++++++++++++++++++++++++++++++++++++++++++
include/linux/mfd/menf21bmc.h | 31 ++++++
4 files changed, 264 insertions(+)
create mode 100644 drivers/mfd/menf21bmc.c
create mode 100644 include/linux/mfd/menf21bmc.h
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index ab5a43c..7c2e8d2 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -427,6 +427,18 @@ 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=y
+ 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.
+ This driver provides common support for accessing the devices;
+ additional drivers must be enabled in order to use the
+ functionality of the BMC device.
+
+
config EZX_PCAP
bool "Motorola EZXPCAP Support"
depends on SPI_MASTER
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 5913208..8f2be38 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -167,3 +167,4 @@ 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
diff --git a/drivers/mfd/menf21bmc.c b/drivers/mfd/menf21bmc.c
new file mode 100644
index 0000000..8de92b5
--- /dev/null
+++ b/drivers/mfd/menf21bmc.c
@@ -0,0 +1,220 @@
+/*
+ * MEN 14F021P00 Board Management Controller (BMC) MFD Core Driver.
+ *
+ * Copyright (C) 2014 MEN Mikro Elektronik Nuernberg GmbH
+ * Author: Andreas Werner <andreas.werner@....de>
+ * All rights reserved.
+ *
+ * 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>
+#include <linux/mfd/menf21bmc.h>
+
+#define BMC_CMD_REV_MAJOR 0x80
+#define BMC_CMD_REV_MINOR 0x81
+#define BMC_CMD_REV_MAIN 0x82
+#define BMC_CMD_REV_BUILD 0x83
+#define BMC_CMD_REV_VERI 0x84
+#define BMC_CMD_WD_ARM_SET 0x18
+#define BMC_CMD_WD_ARM_GET 0x19
+
+static struct mfd_cell menf21bmc_cell[] = {
+ {
+ .name = "menf21bmc_wd",
+ },
+ {
+ .name = "menf21bmc_led",
+ },
+};
+
+static int
+menf21bmc_read_byte_data(struct i2c_client *client, u8 reg)
+{
+ int ret;
+ struct menf21bmc *data = i2c_get_clientdata(client);
+
+ mutex_lock(&data->lock);
+ ret = i2c_smbus_read_byte_data(client, reg);
+ mutex_unlock(&data->lock);
+
+ return ret;
+}
+
+static int
+menf21bmc_read_word_data(struct i2c_client *client, u8 reg)
+{
+ int ret;
+ struct menf21bmc *data = i2c_get_clientdata(client);
+
+ mutex_lock(&data->lock);
+ ret = i2c_smbus_read_word_data(client, reg);
+ mutex_unlock(&data->lock);
+
+ return ret;
+}
+
+static int menf21bmc_write_byte_data(struct i2c_client *client, u8 reg, u8 val)
+{
+ int ret;
+ struct menf21bmc *data = i2c_get_clientdata(client);
+
+ mutex_lock(&data->lock);
+ ret = i2c_smbus_write_byte_data(client, reg, val);
+ mutex_unlock(&data->lock);
+
+ return ret;
+}
+
+static int menf21bmc_write_word_data(struct i2c_client *client, u8 reg, u16 val)
+{
+ int ret;
+ struct menf21bmc *data = i2c_get_clientdata(client);
+
+ mutex_lock(&data->lock);
+ ret = i2c_smbus_write_word_data(client, reg, val);
+ mutex_unlock(&data->lock);
+
+ return ret;
+}
+
+static int menf21bmc_write_byte(struct i2c_client *client, u8 val)
+{
+ int ret;
+ struct menf21bmc *data = i2c_get_clientdata(client);
+
+ mutex_lock(&data->lock);
+ ret = i2c_smbus_write_byte(client, val);
+ mutex_unlock(&data->lock);
+
+ return ret;
+}
+
+static int menf21bmc_wd_leave_prod_mode(struct i2c_client *client)
+{
+ int val, ret;
+
+ val = menf21bmc_read_byte_data(client, BMC_CMD_WD_ARM_GET);
+ 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 leave the mode
+ * if active.
+ */
+ if (val == 0x00) {
+ dev_info(&client->dev,
+ "BMC in production mode. Leave production mode\n");
+
+ ret = menf21bmc_write_byte(client, BMC_CMD_WD_ARM_SET);
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int
+menf21bmc_probe(struct i2c_client *client, const struct i2c_device_id *ids)
+{
+ int ret;
+ struct menf21bmc *data;
+ int rev_major, rev_minor, rev_main;
+
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_BYTE_DATA |
+ I2C_FUNC_SMBUS_WORD_DATA |
+ I2C_FUNC_SMBUS_BYTE))
+ return -EIO;
+
+ data = devm_kzalloc(&client->dev, sizeof(struct menf21bmc), GFP_KERNEL);
+ if (data == NULL)
+ return -ENOMEM;
+
+ mutex_init(&data->lock);
+
+ i2c_set_clientdata(client, data);
+ data->client = client;
+ data->read_word_data = menf21bmc_read_word_data;
+ data->read_byte_data = menf21bmc_read_byte_data;
+ data->write_word_data = menf21bmc_write_word_data;
+ data->write_byte_data = menf21bmc_write_byte_data;
+ data->write_byte = menf21bmc_write_byte;
+
+ rev_major = menf21bmc_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 = menf21bmc_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 = menf21bmc_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 leave the Production Mode of the BMC to activate the
+ * Watchdog functionality and the BIOS life sign monitoring.
+ */
+ ret = menf21bmc_wd_leave_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, "mfd_add_devices failed\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", 0},
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, menf21bmc_id_table);
+
+static struct i2c_driver menf21bmc_driver = {
+ .driver = {
+ .name = "menf21bmc",
+ .owner = THIS_MODULE,
+ },
+ .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@....de");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/mfd/menf21bmc.h b/include/linux/mfd/menf21bmc.h
new file mode 100644
index 0000000..1fc9b5c
--- /dev/null
+++ b/include/linux/mfd/menf21bmc.h
@@ -0,0 +1,31 @@
+/*
+ * MEN 14F021P00 Board Management Controller (BMC)
+ *
+ * Copyright (C) 2014 MEN Mikro Elektronik Nuernberg GmbH
+ * Author: Andreas Werner <andreas.werner@....de>
+ * All rights reserved.
+ *
+ * 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.
+ *
+ */
+
+#ifndef MENF21BMC_H
+#define MENF21BMC_H
+
+struct menf21bmc {
+ struct i2c_client *client;
+ struct mutex lock;
+
+ int (*read_word_data)(struct i2c_client *client, u8 reg);
+ int (*read_byte_data)(struct i2c_client *client, u8 reg);
+ int (*write_word_data)(struct i2c_client *client, u8 reg, u16 val);
+ int (*write_byte_data)(struct i2c_client *client, u8 reg, u8 val);
+ int (*write_byte)(struct i2c_client *client, u8 val);
+};
+
+#endif /* MENF21BMC_H */
+
+
--
1.9.3
--
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