12874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later
2dfbdcd7cSAndreas Werner /*
3dfbdcd7cSAndreas Werner * MEN 14F021P00 Board Management Controller (BMC) MFD Core Driver.
4dfbdcd7cSAndreas Werner *
5dfbdcd7cSAndreas Werner * Copyright (C) 2014 MEN Mikro Elektronik Nuernberg GmbH
6dfbdcd7cSAndreas Werner */
7dfbdcd7cSAndreas Werner
8dfbdcd7cSAndreas Werner #include <linux/kernel.h>
9dfbdcd7cSAndreas Werner #include <linux/device.h>
10dfbdcd7cSAndreas Werner #include <linux/module.h>
11dfbdcd7cSAndreas Werner #include <linux/i2c.h>
12dfbdcd7cSAndreas Werner #include <linux/mfd/core.h>
13dfbdcd7cSAndreas Werner
14dfbdcd7cSAndreas Werner #define BMC_CMD_WDT_EXIT_PROD 0x18
15dfbdcd7cSAndreas Werner #define BMC_CMD_WDT_PROD_STAT 0x19
16dfbdcd7cSAndreas Werner #define BMC_CMD_REV_MAJOR 0x80
17dfbdcd7cSAndreas Werner #define BMC_CMD_REV_MINOR 0x81
18dfbdcd7cSAndreas Werner #define BMC_CMD_REV_MAIN 0x82
19dfbdcd7cSAndreas Werner
20dfbdcd7cSAndreas Werner static struct mfd_cell menf21bmc_cell[] = {
21dfbdcd7cSAndreas Werner { .name = "menf21bmc_wdt", },
22dfbdcd7cSAndreas Werner { .name = "menf21bmc_led", },
23dfbdcd7cSAndreas Werner { .name = "menf21bmc_hwmon", }
24dfbdcd7cSAndreas Werner };
25dfbdcd7cSAndreas Werner
menf21bmc_wdt_exit_prod_mode(struct i2c_client * client)26dfbdcd7cSAndreas Werner static int menf21bmc_wdt_exit_prod_mode(struct i2c_client *client)
27dfbdcd7cSAndreas Werner {
28dfbdcd7cSAndreas Werner int val, ret;
29dfbdcd7cSAndreas Werner
30dfbdcd7cSAndreas Werner val = i2c_smbus_read_byte_data(client, BMC_CMD_WDT_PROD_STAT);
31dfbdcd7cSAndreas Werner if (val < 0)
32dfbdcd7cSAndreas Werner return val;
33dfbdcd7cSAndreas Werner
34dfbdcd7cSAndreas Werner /*
35dfbdcd7cSAndreas Werner * Production mode should be not active after delivery of the Board.
36dfbdcd7cSAndreas Werner * To be sure we check it, inform the user and exit the mode
37dfbdcd7cSAndreas Werner * if active.
38dfbdcd7cSAndreas Werner */
39dfbdcd7cSAndreas Werner if (val == 0x00) {
40dfbdcd7cSAndreas Werner dev_info(&client->dev,
41dfbdcd7cSAndreas Werner "BMC in production mode. Exit production mode\n");
42dfbdcd7cSAndreas Werner
43dfbdcd7cSAndreas Werner ret = i2c_smbus_write_byte(client, BMC_CMD_WDT_EXIT_PROD);
44dfbdcd7cSAndreas Werner if (ret < 0)
45dfbdcd7cSAndreas Werner return ret;
46dfbdcd7cSAndreas Werner }
47dfbdcd7cSAndreas Werner
48dfbdcd7cSAndreas Werner return 0;
49dfbdcd7cSAndreas Werner }
50dfbdcd7cSAndreas Werner
51dfbdcd7cSAndreas Werner static int
menf21bmc_probe(struct i2c_client * client)52a5a689faSUwe Kleine-König menf21bmc_probe(struct i2c_client *client)
53dfbdcd7cSAndreas Werner {
54dfbdcd7cSAndreas Werner int rev_major, rev_minor, rev_main;
55dfbdcd7cSAndreas Werner int ret;
56dfbdcd7cSAndreas Werner
57dfbdcd7cSAndreas Werner ret = i2c_check_functionality(client->adapter,
58dfbdcd7cSAndreas Werner I2C_FUNC_SMBUS_BYTE_DATA |
59dfbdcd7cSAndreas Werner I2C_FUNC_SMBUS_WORD_DATA |
60dfbdcd7cSAndreas Werner I2C_FUNC_SMBUS_BYTE);
61dfbdcd7cSAndreas Werner if (!ret)
62dfbdcd7cSAndreas Werner return -ENODEV;
63dfbdcd7cSAndreas Werner
64dfbdcd7cSAndreas Werner rev_major = i2c_smbus_read_word_data(client, BMC_CMD_REV_MAJOR);
65dfbdcd7cSAndreas Werner if (rev_major < 0) {
66dfbdcd7cSAndreas Werner dev_err(&client->dev, "failed to get BMC major revision\n");
67dfbdcd7cSAndreas Werner return rev_major;
68dfbdcd7cSAndreas Werner }
69dfbdcd7cSAndreas Werner
70dfbdcd7cSAndreas Werner rev_minor = i2c_smbus_read_word_data(client, BMC_CMD_REV_MINOR);
71dfbdcd7cSAndreas Werner if (rev_minor < 0) {
72dfbdcd7cSAndreas Werner dev_err(&client->dev, "failed to get BMC minor revision\n");
73dfbdcd7cSAndreas Werner return rev_minor;
74dfbdcd7cSAndreas Werner }
75dfbdcd7cSAndreas Werner
76dfbdcd7cSAndreas Werner rev_main = i2c_smbus_read_word_data(client, BMC_CMD_REV_MAIN);
77dfbdcd7cSAndreas Werner if (rev_main < 0) {
78dfbdcd7cSAndreas Werner dev_err(&client->dev, "failed to get BMC main revision\n");
79dfbdcd7cSAndreas Werner return rev_main;
80dfbdcd7cSAndreas Werner }
81dfbdcd7cSAndreas Werner
82dfbdcd7cSAndreas Werner dev_info(&client->dev, "FW Revision: %02d.%02d.%02d\n",
83dfbdcd7cSAndreas Werner rev_major, rev_minor, rev_main);
84dfbdcd7cSAndreas Werner
85dfbdcd7cSAndreas Werner /*
86dfbdcd7cSAndreas Werner * We have to exit the Production Mode of the BMC to activate the
87dfbdcd7cSAndreas Werner * Watchdog functionality and the BIOS life sign monitoring.
88dfbdcd7cSAndreas Werner */
89dfbdcd7cSAndreas Werner ret = menf21bmc_wdt_exit_prod_mode(client);
90dfbdcd7cSAndreas Werner if (ret < 0) {
91dfbdcd7cSAndreas Werner dev_err(&client->dev, "failed to leave production mode\n");
92dfbdcd7cSAndreas Werner return ret;
93dfbdcd7cSAndreas Werner }
94dfbdcd7cSAndreas Werner
957990ad17SLaxman Dewangan ret = devm_mfd_add_devices(&client->dev, 0, menf21bmc_cell,
96dfbdcd7cSAndreas Werner ARRAY_SIZE(menf21bmc_cell), NULL, 0, NULL);
97dfbdcd7cSAndreas Werner if (ret < 0) {
98dfbdcd7cSAndreas Werner dev_err(&client->dev, "failed to add BMC sub-devices\n");
99dfbdcd7cSAndreas Werner return ret;
100dfbdcd7cSAndreas Werner }
101dfbdcd7cSAndreas Werner
102dfbdcd7cSAndreas Werner return 0;
103dfbdcd7cSAndreas Werner }
104dfbdcd7cSAndreas Werner
105dfbdcd7cSAndreas Werner static const struct i2c_device_id menf21bmc_id_table[] = {
106dfbdcd7cSAndreas Werner { "menf21bmc" },
107dfbdcd7cSAndreas Werner { }
108dfbdcd7cSAndreas Werner };
109dfbdcd7cSAndreas Werner MODULE_DEVICE_TABLE(i2c, menf21bmc_id_table);
110dfbdcd7cSAndreas Werner
111dfbdcd7cSAndreas Werner static struct i2c_driver menf21bmc_driver = {
112dfbdcd7cSAndreas Werner .driver.name = "menf21bmc",
113dfbdcd7cSAndreas Werner .id_table = menf21bmc_id_table,
114*9816d859SUwe Kleine-König .probe = menf21bmc_probe,
115dfbdcd7cSAndreas Werner };
116dfbdcd7cSAndreas Werner
117dfbdcd7cSAndreas Werner module_i2c_driver(menf21bmc_driver);
118dfbdcd7cSAndreas Werner
119dfbdcd7cSAndreas Werner MODULE_DESCRIPTION("MEN 14F021P00 BMC mfd core driver");
120dfbdcd7cSAndreas Werner MODULE_AUTHOR("Andreas Werner <andreas.werner@men.de>");
121dfbdcd7cSAndreas Werner MODULE_LICENSE("GPL v2");
122