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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 *  MEN 14F021P00 Board Management Controller (BMC) MFD Core Driver.4 *5 *  Copyright (C) 2014 MEN Mikro Elektronik Nuernberg GmbH6 */7 8#include <linux/kernel.h>9#include <linux/device.h>10#include <linux/module.h>11#include <linux/i2c.h>12#include <linux/mfd/core.h>13 14#define BMC_CMD_WDT_EXIT_PROD	0x1815#define BMC_CMD_WDT_PROD_STAT	0x1916#define BMC_CMD_REV_MAJOR	0x8017#define BMC_CMD_REV_MINOR	0x8118#define BMC_CMD_REV_MAIN	0x8219 20static struct mfd_cell menf21bmc_cell[] = {21	{ .name = "menf21bmc_wdt", },22	{ .name = "menf21bmc_led", },23	{ .name = "menf21bmc_hwmon", }24};25 26static int menf21bmc_wdt_exit_prod_mode(struct i2c_client *client)27{28	int val, ret;29 30	val = i2c_smbus_read_byte_data(client, BMC_CMD_WDT_PROD_STAT);31	if (val < 0)32		return val;33 34	/*35	 * Production mode should be not active after delivery of the Board.36	 * To be sure we check it, inform the user and exit the mode37	 * if active.38	 */39	if (val == 0x00) {40		dev_info(&client->dev,41			"BMC in production mode. Exit production mode\n");42 43		ret = i2c_smbus_write_byte(client, BMC_CMD_WDT_EXIT_PROD);44		if (ret < 0)45			return ret;46	}47 48	return 0;49}50 51static int52menf21bmc_probe(struct i2c_client *client)53{54	int rev_major, rev_minor, rev_main;55	int ret;56 57	ret = i2c_check_functionality(client->adapter,58				      I2C_FUNC_SMBUS_BYTE_DATA |59				      I2C_FUNC_SMBUS_WORD_DATA |60				      I2C_FUNC_SMBUS_BYTE);61	if (!ret)62		return -ENODEV;63 64	rev_major = i2c_smbus_read_word_data(client, BMC_CMD_REV_MAJOR);65	if (rev_major < 0) {66		dev_err(&client->dev, "failed to get BMC major revision\n");67		return rev_major;68	}69 70	rev_minor = i2c_smbus_read_word_data(client, BMC_CMD_REV_MINOR);71	if (rev_minor < 0) {72		dev_err(&client->dev, "failed to get BMC minor revision\n");73		return rev_minor;74	}75 76	rev_main = i2c_smbus_read_word_data(client, BMC_CMD_REV_MAIN);77	if (rev_main < 0) {78		dev_err(&client->dev, "failed to get BMC main revision\n");79		return rev_main;80	}81 82	dev_info(&client->dev, "FW Revision: %02d.%02d.%02d\n",83		 rev_major, rev_minor, rev_main);84 85	/*86	 * We have to exit the Production Mode of the BMC to activate the87	 * Watchdog functionality and the BIOS life sign monitoring.88	 */89	ret = menf21bmc_wdt_exit_prod_mode(client);90	if (ret < 0) {91		dev_err(&client->dev, "failed to leave production mode\n");92		return ret;93	}94 95	ret = devm_mfd_add_devices(&client->dev, 0, menf21bmc_cell,96				   ARRAY_SIZE(menf21bmc_cell), NULL, 0, NULL);97	if (ret < 0) {98		dev_err(&client->dev, "failed to add BMC sub-devices\n");99		return ret;100	}101 102	return 0;103}104 105static const struct i2c_device_id menf21bmc_id_table[] = {106	{ "menf21bmc" },107	{ }108};109MODULE_DEVICE_TABLE(i2c, menf21bmc_id_table);110 111static struct i2c_driver menf21bmc_driver = {112	.driver.name	= "menf21bmc",113	.id_table	= menf21bmc_id_table,114	.probe		= menf21bmc_probe,115};116 117module_i2c_driver(menf21bmc_driver);118 119MODULE_DESCRIPTION("MEN 14F021P00 BMC mfd core driver");120MODULE_AUTHOR("Andreas Werner <andreas.werner@men.de>");121MODULE_LICENSE("GPL v2");122