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121 lines
3.0 KiB
121 lines
3.0 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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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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#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 = devm_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 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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}; |
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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 <[email protected]>"); |
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MODULE_LICENSE("GPL v2");
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