Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932880AbaGQMdI (ORCPT ); Thu, 17 Jul 2014 08:33:08 -0400 Received: from mail1.bemta5.messagelabs.com ([195.245.231.153]:47819 "EHLO mail1.bemta5.messagelabs.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932833AbaGQMdF (ORCPT ); Thu, 17 Jul 2014 08:33:05 -0400 X-Env-Sender: Andreas.Werner@men.de X-Msg-Ref: server-16.tower-178.messagelabs.com!1405599960!37667395!1 X-Originating-IP: [80.255.6.145] X-StarScan-Received: X-StarScan-Version: 6.11.3; banners=-,-,- X-VirusChecked: Checked X-PGP-Universal: processed; by keys.men.de on Thu, 17 Jul 2014 14:26:00 +0200 Date: Thu, 17 Jul 2014 15:18:09 +0200 From: Andreas Werner To: CC: , , , , , , Subject: [PATCH v3 1/3] drivers/mfd/menf21bmc: introduce MEN 14F021P00 BMC MFD Core driver Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.23 (2014-03-12) X-Originating-IP: [192.1.1.171] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The MEN 14F021P00 Board Management Controller provides an I2C interface to the host to access the feature implemented in the BMC. The BMC is a PIC Microntroller assembled on CPCI Card from MEN Mikroelektronik and on a few Box/Display Computer. Added MFD Core driver, supporting the I2C communication to the device. The MFD driver currently supports the following features: - Watchdog - LEDs Signed-off-by: Andreas Werner --- drivers/mfd/Kconfig | 12 +++++ drivers/mfd/Makefile | 1 + drivers/mfd/menf21bmc.c | 136 ++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 149 insertions(+) create mode 100644 drivers/mfd/menf21bmc.c diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index b8d9ca0..6e2cd14 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -453,6 +453,18 @@ config MFD_MAX8998 additional drivers must be enabled in order to use the functionality of the device. +config MFD_MENF21BMC + tristate "MEN 14F021P00 Board Management Controller Support" + depends on I2C=y + select MFD_CORE + help + Say yes here to add support for the MEN 14F021P00 BMC + which is a Board Management Controller connected to the I2C bus. + The device supports multiple sub-devices like LED and WDT. + This driver provides common support for accessing the devices; + additional drivers must be enabled in order to use the + functionality of the BMC device. + config EZX_PCAP bool "Motorola EZXPCAP Support" depends on SPI_MASTER diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 4e2bc25..37bf336 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -169,6 +169,7 @@ obj-$(CONFIG_MFD_AS3711) += as3711.o obj-$(CONFIG_MFD_AS3722) += as3722.o obj-$(CONFIG_MFD_STW481X) += stw481x.o obj-$(CONFIG_MFD_IPAQ_MICRO) += ipaq-micro.o +obj-$(CONFIG_MFD_MENF21BMC) += menf21bmc.o intel-soc-pmic-objs := intel_soc_pmic_core.o intel_soc_pmic_crc.o obj-$(CONFIG_INTEL_SOC_PMIC) += intel-soc-pmic.o diff --git a/drivers/mfd/menf21bmc.c b/drivers/mfd/menf21bmc.c new file mode 100644 index 0000000..76f94cd --- /dev/null +++ b/drivers/mfd/menf21bmc.c @@ -0,0 +1,136 @@ +/* + * MEN 14F021P00 Board Management Controller (BMC) MFD Core Driver. + * + * Copyright (C) 2014 MEN Mikro Elektronik Nuernberg GmbH + * Author: Andreas Werner + * All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + */ + +#include +#include +#include +#include +#include + +#define BMC_CMD_REV_MAJOR 0x80 +#define BMC_CMD_REV_MINOR 0x81 +#define BMC_CMD_REV_MAIN 0x82 +#define BMC_CMD_WDT_EXIT_PROD 0x18 +#define BMC_CMD_WDT_PROD_STAT 0x19 + +static struct mfd_cell menf21bmc_cell[] = { + { .name = "menf21bmc_wdt", }, + { .name = "menf21bmc_led", }, +}; + +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 ret; + int rev_major, rev_minor, rev_main; + + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_BYTE_DATA | + I2C_FUNC_SMBUS_WORD_DATA | + I2C_FUNC_SMBUS_BYTE)) + 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 = 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 int menf21bmc_remove(struct i2c_client *client) +{ + mfd_remove_devices(&client->dev); + return 0; +} + +static const struct i2c_device_id menf21bmc_id_table[] = { + { "menf21bmc", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, menf21bmc_id_table); + +static struct i2c_driver menf21bmc_driver = { + .driver = { + .name = "menf21bmc", + .owner = THIS_MODULE, + }, + .id_table = menf21bmc_id_table, + .probe = menf21bmc_probe, + .remove = menf21bmc_remove, +}; + +module_i2c_driver(menf21bmc_driver); + +MODULE_DESCRIPTION("MEN 14F021P00 BMC mfd core driver"); +MODULE_AUTHOR("Andreas Werner "); +MODULE_LICENSE("GPL"); -- 2.0.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/