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Message-ID: <20140717140653.GA8468@awelinux> Date: Thu, 17 Jul 2014 16:06:53 +0200 From: Andreas Werner <andreas.werner@....de> To: Lee Jones <lee.jones@...aro.org> CC: Andreas Werner <andreas.werner@....de>, <linux-kernel@...r.kernel.org>, <sameo@...ux.intel.com>, <cooloney@...il.com>, <rpurdie@...ys.net>, <linux-leds@...r.kernel.org>, <wim@...ana.be>, <linux-watchdog@...r.kernel.org> Subject: Re: [PATCH v3 1/3] drivers/mfd/menf21bmc: introduce MEN 14F021P00 BMC MFD Core driver On Thu, Jul 17, 2014 at 01:41:56PM +0100, Lee Jones wrote: > On Thu, 17 Jul 2014, Andreas Werner wrote: > > 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 <andreas.werner@....de> > > --- > > 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. > > Can you mention what those devices are here in the help text? > I've mentioned the sub-devices "LED" and "WDT" but i can also write the name to the help text like "menf21bmc_wdt" and "leds-menf21bmc". > > 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 <andreas.werner@....de> > > + * All rights reserved. > > This normally resides wit the company, rather than the author. Ok, i'wíll the author suff. > > > + * 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. > > + * > > Remove this line. > > > + */ > > + > > +#include <linux/kernel.h> > > +#include <linux/device.h> > > +#include <linux/module.h> > > +#include <linux/i2c.h> > > +#include <linux/mfd/core.h> > > + > > +#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 > > If these are in the same address space, can you order them by number. No problem, i will order them, they are in the same space. > > > +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)) > > Can you take the function call out of the if() please? Yes I can do it. > > > + 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, > > Remove this line, it's handled elsewhere. Which line? the ".owner" line? > > > + }, > > + .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 <andreas.werner@....de>"); > > +MODULE_LICENSE("GPL"); > > The header says that this is GPL v2. Will change that. > > -- > Lee Jones > Linaro STMicroelectronics Landing Team Lead > Linaro.org │ Open source software for ARM SoCs > Follow Linaro: Facebook | Twitter | Blog -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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