1 files changed, 132 insertions, 0 deletions

diff --git a/drivers/mfd/menf21bmc.c b/drivers/mfd/menf21bmc.c
new file mode 100644
index 000000000000..1c274345820c
--- /dev/null
+++ b/drivers/mfd/menf21bmc.c
@@ -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");