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Date:	Tue, 29 Jul 2014 23:12:56 +0200
From:	Wim Van Sebroeck <wim@...ana.be>
To:	Andreas Werner <andreas.werner@....de>
Cc:	Bryan Wu <cooloney@...il.com>, lkml <linux-kernel@...r.kernel.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	"rpurdie@...ys.net" <rpurdie@...ys.net>,
	Linux LED Subsystem <linux-leds@...r.kernel.org>,
	linux-watchdog@...r.kernel.org
Subject: Re: [PATCH v3 3/3] drivers/leds/leds-menf21bmc: introduce MEN 14F021P00 BMC LED driver

Hi Andreas,

> aOn Thu, Jul 24, 2014 at 03:00:09PM -0700, Bryan Wu wrote:
> > On Thu, Jul 17, 2014 at 6:18 AM, Andreas Werner <andreas.werner@....de> wrote:
> > > Added driver to support the 14F021P00 BMC LEDs.
> > > The BMC is a Board Management Controll include four LEDs which
> > > can be switched on and off.
> > >
> > > This driver use the I2C interface to the BMC using the menf21bmc MFD Core driver.
> > >
> > > Signed-off-by: Andreas Werner <andreas.werner@....de>
> > > ---
> > >  drivers/leds/Kconfig          |   6 ++
> > >  drivers/leds/Makefile         |   1 +
> > >  drivers/leds/leds-menf21bmc.c | 134 ++++++++++++++++++++++++++++++++++++++++++
> > >  3 files changed, 141 insertions(+)
> > >  create mode 100644 drivers/leds/leds-menf21bmc.c
> > >
> > > diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
> > > index 27cf0cd..d38ff3f 100644
> > > --- a/drivers/leds/Kconfig
> > > +++ b/drivers/leds/Kconfig
> > > @@ -458,6 +458,12 @@ config LEDS_OT200
> > >           This option enables support for the LEDs on the Bachmann OT200.
> > >           Say Y to enable LEDs on the Bachmann OT200.
> > >
> > > +config LEDS_MENF21BMC
> > > +       tristate "LED support for the MEN 14F021P00 BMC"
> > > +       depends on LEDS_CLASS && MFD_MENF21BMC
> > 
> > I think it also depends on I2C.
> 
> Yes you are right.
> 
> > 
> > > +       help
> > > +         Say Y here to include support for the MEN 14F021P00 BMC LEDs.
> > > +
> > >  comment "LED driver for blink(1) USB RGB LED is under Special HID drivers (HID_THINGM)"
> > >
> > >  config LEDS_BLINKM
> > > diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
> > > index 3c03666..cadc433 100644
> > > --- a/drivers/leds/Makefile
> > > +++ b/drivers/leds/Makefile
> > > @@ -53,6 +53,7 @@ obj-$(CONFIG_LEDS_MAX8997)            += leds-max8997.o
> > >  obj-$(CONFIG_LEDS_LM355x)              += leds-lm355x.o
> > >  obj-$(CONFIG_LEDS_BLINKM)              += leds-blinkm.o
> > >  obj-$(CONFIG_LEDS_VERSATILE)           += leds-versatile.o
> > > +obj-$(CONFIG_LEDS_MENF21BMC)           += leds-menf21bmc.o
> > >
> > >  # LED SPI Drivers
> > >  obj-$(CONFIG_LEDS_DAC124S085)          += leds-dac124s085.o
> > > diff --git a/drivers/leds/leds-menf21bmc.c b/drivers/leds/leds-menf21bmc.c
> > > new file mode 100644
> > > index 0000000..5eaa119
> > > --- /dev/null
> > > +++ b/drivers/leds/leds-menf21bmc.c
> > > @@ -0,0 +1,134 @@
> > > +/*
> > > + *  MEN 14F021P00 Board Management Controller (BMC) LEDs Driver.
> > > + *
> > > + *  This is the core LED driver of the MEN 14F021P00 BMC.
> > > + *  There are four LEDs available which can be switched on and off.
> > > + *  STATUS LED, HOT SWAP LED, USER LED 1, USER LED 2
> > > + *
> > > + *  Copyright (C) 2014 MEN Mikro Elektronik Nuernberg GmbH
> > > + *  Author: Andreas Werner <andreas.werner@....de>
> > > + *  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 <linux/module.h>
> > > +#include <linux/kernel.h>
> > > +#include <linux/platform_device.h>
> > > +#include <linux/leds.h>
> > > +#include <linux/i2c.h>
> > > +
> > > +#define BMC_CMD_LED_GET_SET    0xA0
> > > +#define BMC_BIT_LED_STATUS     BIT(0)
> > > +#define BMC_BIT_LED_HOTSWAP    BIT(1)
> > > +#define BMC_BIT_LED_USER1      BIT(2)
> > > +#define BMC_BIT_LED_USER2      BIT(3)
> > > +
> > > +struct menf21bmc_led {
> > > +       struct led_classdev cdev;
> > > +       u8 led_bit;
> > > +       const char *name;
> > > +       struct i2c_client *i2c_client;
> > > +};
> > > +
> > > +static struct menf21bmc_led leds[] = {
> > > +       {
> > > +               .name = "menf21bmc:led_status",
> > > +               .led_bit = BMC_BIT_LED_STATUS,
> > > +       },
> > > +       {
> > > +               .name = "menf21bmc:led_hotswap",
> > > +               .led_bit = BMC_BIT_LED_HOTSWAP,
> > > +       },
> > > +       {
> > > +               .name = "menf21bmc:led_user1",
> > > +               .led_bit = BMC_BIT_LED_USER1,
> > > +       },
> > > +       {
> > > +               .name = "menf21bmc:led_user2",
> > > +               .led_bit = BMC_BIT_LED_USER2,
> > > +       }
> > > +};
> > > +
> > > +static DEFINE_MUTEX(led_lock);
> > > +
> > > +static void
> > > +menf21bmc_led_set(struct led_classdev *led_cdev, enum led_brightness value)
> > > +{
> > > +       int led_val;
> > > +       struct menf21bmc_led *led = container_of(led_cdev,
> > > +                                       struct menf21bmc_led, cdev);
> > > +
> > > +       mutex_lock(&led_lock);
> > > +       led_val = i2c_smbus_read_byte_data(led->i2c_client,
> > > +                                               BMC_CMD_LED_GET_SET);
> > > +       if (led_val < 0)
> > > +               goto err_out;
> > > +
> > > +       if (value == LED_OFF)
> > > +               led_val &= ~led->led_bit;
> > > +       else
> > > +               led_val |= led->led_bit;
> > > +
> > > +       i2c_smbus_write_byte_data(led->i2c_client,
> > > +                                       BMC_CMD_LED_GET_SET, led_val);
> > > +err_out:
> > > +       mutex_unlock(&led_lock);
> > > +}
> > > +
> > > +static int menf21bmc_led_probe(struct platform_device *pdev)
> > > +{
> > > +       int i;
> > > +       int ret;
> > > +       struct i2c_client *i2c_client = to_i2c_client(pdev->dev.parent);
> > > +
> > > +       for (i = 0; i < ARRAY_SIZE(leds); i++) {
> > > +               leds[i].cdev.name = leds[i].name;
> > > +               leds[i].cdev.brightness_set = menf21bmc_led_set;
> > > +               leds[i].i2c_client = i2c_client;
> > > +               ret = led_classdev_register(&pdev->dev, &leds[i].cdev);
> > > +               if (ret < 0)
> > > +                       goto err_free_leds;
> > > +       }
> > > +       dev_info(&pdev->dev, "MEN 140F21P00 BMC LED device enabled\n");
> > > +
> > > +       return 0;
> > > +
> > > +err_free_leds:
> > > +       dev_err(&pdev->dev, "failed to register LED device\n");
> > > +
> > > +       for (i = i - 1; i >= 0; i--)
> > > +               led_classdev_unregister(&leds[i].cdev);
> > > +
> > > +       return ret;
> > > +}
> > > +
> > > +static int menf21bmc_led_remove(struct platform_device *pdev)
> > > +{
> > > +       int i;
> > > +
> > > +       for (i = 0; i < ARRAY_SIZE(leds); i++)
> > > +               led_classdev_unregister(&leds[i].cdev);
> > > +
> > > +       return 0;
> > > +}
> > > +
> > > +static struct platform_driver menf21bmc_led = {
> > > +       .probe          = menf21bmc_led_probe,
> > > +       .remove         = menf21bmc_led_remove,
> > > +       .driver         = {
> > > +               .name           = "menf21bmc_led",
> > > +               .owner          = THIS_MODULE,
> > > +       },
> > > +};
> > > +
> > 
> > This is not a normal platform driver, it should be a I2C driver.
> > 
> > > +module_platform_driver(menf21bmc_led);
> > 
> > So please move to use module_i2c_driver.
> 
> Ok, but then I have to change that in the watchdog driver too, which
> is quite the same as here.
> 
> Lee, Guenther what do you think regarding the watchdog driver?

If the watchdog part is indeed also i2c alike device then the watchdog part should also be an i2c driver...

> > 
> > Thanks,
> > -Bryan
> > 
> > > +
> > > +MODULE_AUTHOR("Andreas Werner <andreas.werner@....de>");
> > > +MODULE_DESCRIPTION("MEN 14F021P00 BMC led driver");
> > > +MODULE_LICENSE("GPL");
> > > +MODULE_ALIAS("platform:menf21bmc_led");
> > > --
> > > 2.0.1
> > >
> 
> Thanks for review.
> 
> Andy

Kind regards,
Wim.

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