[linux.git] / drivers / mfd / menf21bmc.c

// 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)
{
	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 <[email protected]>");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
dfbdcd7c AW	2	/*
	3	* MEN 14F021P00 Board Management Controller (BMC) MFD Core Driver.
	4	*
	5	* Copyright (C) 2014 MEN Mikro Elektronik Nuernberg GmbH
dfbdcd7c AW	6	*/
	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 0x18
	15	#define BMC_CMD_WDT_PROD_STAT 0x19
	16	#define BMC_CMD_REV_MAJOR 0x80
	17	#define BMC_CMD_REV_MINOR 0x81
	18	#define BMC_CMD_REV_MAIN 0x82
	19
	20	static struct mfd_cell menf21bmc_cell[] = {
	21	{ .name = "menf21bmc_wdt", },
	22	{ .name = "menf21bmc_led", },
	23	{ .name = "menf21bmc_hwmon", }
	24	};
	25
	26	static 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 mode
	37	* 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
	51	static int
a5a689fa	52	menf21bmc_probe(struct i2c_client *client)
dfbdcd7c AW	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 the
	87	* 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
7990ad17 LD	95	ret = devm_mfd_add_devices(&client->dev, 0, menf21bmc_cell,
7990ad17 LD	96	ARRAY_SIZE(menf21bmc_cell), NULL, 0, NULL);
dfbdcd7c AW	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
dfbdcd7c AW	105	static const struct i2c_device_id menf21bmc_id_table[] = {
	106	{ "menf21bmc" },
	107	{ }
	108	};
	109	MODULE_DEVICE_TABLE(i2c, menf21bmc_id_table);
	110
	111	static struct i2c_driver menf21bmc_driver = {
	112	.driver.name = "menf21bmc",
	113	.id_table = menf21bmc_id_table,
9816d859	114	.probe = menf21bmc_probe,
dfbdcd7c AW	115	};
	116
	117	module_i2c_driver(menf21bmc_driver);
	118
	119	MODULE_DESCRIPTION("MEN 14F021P00 BMC mfd core driver");
	120	MODULE_AUTHOR("Andreas Werner <[email protected]>");
	121	MODULE_LICENSE("GPL v2");