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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 - Hwmon (voltage monitoring) Signed-off-by: Andreas Werner <andreas.werner@men.de> Signed-off-by: Lee Jones <lee.jones@linaro.org>
133 lines
3.3 KiB
C
133 lines
3.3 KiB
C
/*
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* MEN 14F021P00 Board Management Controller (BMC) MFD Core Driver.
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*
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* Copyright (C) 2014 MEN Mikro Elektronik Nuernberg GmbH
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/mfd/core.h>
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#define BMC_CMD_WDT_EXIT_PROD 0x18
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#define BMC_CMD_WDT_PROD_STAT 0x19
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#define BMC_CMD_REV_MAJOR 0x80
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#define BMC_CMD_REV_MINOR 0x81
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#define BMC_CMD_REV_MAIN 0x82
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static struct mfd_cell menf21bmc_cell[] = {
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{ .name = "menf21bmc_wdt", },
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{ .name = "menf21bmc_led", },
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{ .name = "menf21bmc_hwmon", }
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};
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static int menf21bmc_wdt_exit_prod_mode(struct i2c_client *client)
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{
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int val, ret;
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val = i2c_smbus_read_byte_data(client, BMC_CMD_WDT_PROD_STAT);
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if (val < 0)
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return val;
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/*
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* Production mode should be not active after delivery of the Board.
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* To be sure we check it, inform the user and exit the mode
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* if active.
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*/
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if (val == 0x00) {
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dev_info(&client->dev,
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"BMC in production mode. Exit production mode\n");
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ret = i2c_smbus_write_byte(client, BMC_CMD_WDT_EXIT_PROD);
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if (ret < 0)
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return ret;
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}
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return 0;
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}
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static int
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menf21bmc_probe(struct i2c_client *client, const struct i2c_device_id *ids)
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{
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int rev_major, rev_minor, rev_main;
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int ret;
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ret = i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_BYTE_DATA |
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I2C_FUNC_SMBUS_WORD_DATA |
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I2C_FUNC_SMBUS_BYTE);
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if (!ret)
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return -ENODEV;
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rev_major = i2c_smbus_read_word_data(client, BMC_CMD_REV_MAJOR);
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if (rev_major < 0) {
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dev_err(&client->dev, "failed to get BMC major revision\n");
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return rev_major;
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}
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rev_minor = i2c_smbus_read_word_data(client, BMC_CMD_REV_MINOR);
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if (rev_minor < 0) {
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dev_err(&client->dev, "failed to get BMC minor revision\n");
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return rev_minor;
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}
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rev_main = i2c_smbus_read_word_data(client, BMC_CMD_REV_MAIN);
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if (rev_main < 0) {
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dev_err(&client->dev, "failed to get BMC main revision\n");
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return rev_main;
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}
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dev_info(&client->dev, "FW Revision: %02d.%02d.%02d\n",
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rev_major, rev_minor, rev_main);
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/*
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* We have to exit the Production Mode of the BMC to activate the
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* Watchdog functionality and the BIOS life sign monitoring.
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*/
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ret = menf21bmc_wdt_exit_prod_mode(client);
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if (ret < 0) {
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dev_err(&client->dev, "failed to leave production mode\n");
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return ret;
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}
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ret = mfd_add_devices(&client->dev, 0, menf21bmc_cell,
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ARRAY_SIZE(menf21bmc_cell), NULL, 0, NULL);
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if (ret < 0) {
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dev_err(&client->dev, "failed to add BMC sub-devices\n");
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return ret;
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}
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return 0;
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}
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static int menf21bmc_remove(struct i2c_client *client)
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{
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mfd_remove_devices(&client->dev);
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return 0;
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}
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static const struct i2c_device_id menf21bmc_id_table[] = {
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{ "menf21bmc" },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, menf21bmc_id_table);
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static struct i2c_driver menf21bmc_driver = {
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.driver.name = "menf21bmc",
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.id_table = menf21bmc_id_table,
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.probe = menf21bmc_probe,
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.remove = menf21bmc_remove,
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};
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module_i2c_driver(menf21bmc_driver);
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MODULE_DESCRIPTION("MEN 14F021P00 BMC mfd core driver");
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MODULE_AUTHOR("Andreas Werner <andreas.werner@men.de>");
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MODULE_LICENSE("GPL v2");
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