[PATCH 1/3] drivers/mfd/menf21bmc: introduce MEN 14F021P00 BMC MFD Core driver

From: Andreas Werner
Date: Fri May 16 2014 - 11:50:43 EST

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@xxxxxx>
---
drivers/mfd/Kconfig | 12 +++
drivers/mfd/Makefile | 1 +
drivers/mfd/menf21bmc.c | 193 ++++++++++++++++++++++++++++++++++++++++++
include/linux/mfd/menf21bmc.h | 32 +++++++
4 files changed, 238 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..77de1a8
--- /dev/null
+++ b/drivers/mfd/menf21bmc.c
@@ -0,0 +1,193 @@
+/*
+ * MEN 14F021P00 Board Management Controller (BMC) MFD Core Driver.
+ *
+ * Copyright (C) 2014 MEN Mikro Elektronik Nuernberg GmbH
+ * Author: Andreas Werner <andreas.werner@xxxxxx>
+ * 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
+
+static struct mfd_cell menf21bmc_cell[] = {
+ {
+ .name = "menf21bmc_wd",
+ },
+ {
+ .name = "menf21bmc_led",
+ },
+};
+
+static int
+menf21bmc_read_byte_data(struct i2c_client *client, u8 reg, uint8_t *val)
+{
+ 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);
+
+ if (ret < 0) {
+ dev_err(&client->dev, "failed to read byte at 0x%02x\n", reg);
+ return ret;
+ }
+
+ *val = (uint8_t)ret;
+
+ return 0;
+}
+
+static int
+menf21bmc_read_word_data(struct i2c_client *client, u8 reg, uint16_t *val)
+{
+ 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);
+
+ if (ret < 0) {
+ dev_err(&client->dev, "failed to read word at 0x%02x\n", reg);
+ return ret;
+ }
+ *val = (uint16_t)ret;
+
+ return 0;
+}
+
+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_probe(struct i2c_client *client, const struct i2c_device_id *ids)
+{
+ struct menf21bmc *data;
+ uint16_t rev_major, rev_minor, rev_main, rev_build, rev_veri;
+ int ret = 0;
+
+ dev_dbg(&client->dev, "menf21bmc_probe\n");
+
+ 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;
+
+ ret |= menf21bmc_read_word_data(client, BMC_CMD_REV_MAJOR, &rev_major);
+ ret |= menf21bmc_read_word_data(client, BMC_CMD_REV_MINOR, &rev_minor);
+ ret |= menf21bmc_read_word_data(client, BMC_CMD_REV_MAIN, &rev_main);
+ ret |= menf21bmc_read_word_data(client, BMC_CMD_REV_BUILD, &rev_build);
+ ret |= menf21bmc_read_word_data(client, BMC_CMD_REV_VERI, &rev_veri);
+
+ if (ret) {
+ dev_err(&client->dev, "Cannot get Firmware Revision\n");
+ return -EIO;
+ }
+
+ dev_info(&client->dev, "FW Revision: %02d.%02d.%02d\n",
+ rev_major, rev_minor, rev_main);
+ dev_info(&client->dev, "Build: %d Verificaton Marker: %d\n",
+ rev_build, rev_veri);
+
+ 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@xxxxxx");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/mfd/menf21bmc.h b/include/linux/mfd/menf21bmc.h
new file mode 100644
index 0000000..49df41fe
--- /dev/null
+++ b/include/linux/mfd/menf21bmc.h
@@ -0,0 +1,32 @@
+/*
+ * MEN 14F021P00 Board Management Controller (BMC)
+ *
+ * Copyright (C) 2014 MEN Mikro Elektronik Nuernberg GmbH
+ * Author: Andreas Werner <andreas.werner@xxxxxx>
+ * 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, uint16_t *val);
+ int (*read_byte_data)(struct i2c_client *client, u8 reg, uint8_t *val);
+ 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 */
+
+
--
1.9.2

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