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Message-ID: <20140729211256.GB30849@spo001.leaseweb.com>
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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