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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 | // SPDX-License-Identifier: GPL-2.0-or-later /* * MEN 14F021P00 Board Management Controller (BMC) MFD Core Driver. * * Copyright (C) 2014 MEN Mikro Elektronik Nuernberg GmbH */ #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 = devm_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 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, }; 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"); |