2 * MEN 14F021P00 Board Management Controller (BMC) MFD Core Driver.
4 * Copyright (C) 2014 MEN Mikro Elektronik Nuernberg GmbH
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
12 #include <linux/kernel.h>
13 #include <linux/device.h>
14 #include <linux/module.h>
15 #include <linux/i2c.h>
16 #include <linux/mfd/core.h>
18 #define BMC_CMD_WDT_EXIT_PROD 0x18
19 #define BMC_CMD_WDT_PROD_STAT 0x19
20 #define BMC_CMD_REV_MAJOR 0x80
21 #define BMC_CMD_REV_MINOR 0x81
22 #define BMC_CMD_REV_MAIN 0x82
24 static struct mfd_cell menf21bmc_cell[] = {
25 { .name = "menf21bmc_wdt", },
26 { .name = "menf21bmc_led", },
27 { .name = "menf21bmc_hwmon", }
30 static int menf21bmc_wdt_exit_prod_mode(struct i2c_client *client)
34 val = i2c_smbus_read_byte_data(client, BMC_CMD_WDT_PROD_STAT);
39 * Production mode should be not active after delivery of the Board.
40 * To be sure we check it, inform the user and exit the mode
44 dev_info(&client->dev,
45 "BMC in production mode. Exit production mode\n");
47 ret = i2c_smbus_write_byte(client, BMC_CMD_WDT_EXIT_PROD);
56 menf21bmc_probe(struct i2c_client *client, const struct i2c_device_id *ids)
58 int rev_major, rev_minor, rev_main;
61 ret = i2c_check_functionality(client->adapter,
62 I2C_FUNC_SMBUS_BYTE_DATA |
63 I2C_FUNC_SMBUS_WORD_DATA |
68 rev_major = i2c_smbus_read_word_data(client, BMC_CMD_REV_MAJOR);
70 dev_err(&client->dev, "failed to get BMC major revision\n");
74 rev_minor = i2c_smbus_read_word_data(client, BMC_CMD_REV_MINOR);
76 dev_err(&client->dev, "failed to get BMC minor revision\n");
80 rev_main = i2c_smbus_read_word_data(client, BMC_CMD_REV_MAIN);
82 dev_err(&client->dev, "failed to get BMC main revision\n");
86 dev_info(&client->dev, "FW Revision: %02d.%02d.%02d\n",
87 rev_major, rev_minor, rev_main);
90 * We have to exit the Production Mode of the BMC to activate the
91 * Watchdog functionality and the BIOS life sign monitoring.
93 ret = menf21bmc_wdt_exit_prod_mode(client);
95 dev_err(&client->dev, "failed to leave production mode\n");
99 ret = mfd_add_devices(&client->dev, 0, menf21bmc_cell,
100 ARRAY_SIZE(menf21bmc_cell), NULL, 0, NULL);
102 dev_err(&client->dev, "failed to add BMC sub-devices\n");
109 static int menf21bmc_remove(struct i2c_client *client)
111 mfd_remove_devices(&client->dev);
115 static const struct i2c_device_id menf21bmc_id_table[] = {
119 MODULE_DEVICE_TABLE(i2c, menf21bmc_id_table);
121 static struct i2c_driver menf21bmc_driver = {
122 .driver.name = "menf21bmc",
123 .id_table = menf21bmc_id_table,
124 .probe = menf21bmc_probe,
125 .remove = menf21bmc_remove,
128 module_i2c_driver(menf21bmc_driver);
130 MODULE_DESCRIPTION("MEN 14F021P00 BMC mfd core driver");
131 MODULE_AUTHOR("Andreas Werner <andreas.werner@men.de>");
132 MODULE_LICENSE("GPL v2");