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Message-ID: <CAK5ve-KCv=kfkJK-x5m1sFiSBVH9FMUys_tLw5Cup=3rHLZxYQ@mail.gmail.com>
Date: Mon, 25 Aug 2014 11:53:32 -0700
From: Bryan Wu <cooloney@...il.com>
To: Andreas Werner <andreas.werner@....de>
Cc: lkml <linux-kernel@...r.kernel.org>,
Samuel Ortiz <sameo@...ux.intel.com>,
Lee Jones <lee.jones@...aro.org>, wim@...ana.be,
linux-watchdog@...r.kernel.org,
"rpurdie@...ys.net" <rpurdie@...ys.net>,
Linux LED Subsystem <linux-leds@...r.kernel.org>,
Jean Delvare <jdelvare@...e.de>, linux@...ck-us.net,
lm-sensors@...sensors.org
Subject: Re: [PATCH v4 3/4] drivers/leds/leds-menf21bmc: introduce MEN
14F021P00 BMC LED driver
On Wed, Aug 13, 2014 at 1:40 AM, Andreas Werner <andreas.werner@....de> wrote:
> Added driver to support the 14F021P00 BMC LEDs.
> The BMC is a Board Management Controller including four LEDs which
> can be switched on and off.
>
> Signed-off-by: Andreas Werner <andreas.werner@....de>
> ---
> drivers/leds/Kconfig | 6 ++
> drivers/leds/Makefile | 1 +
> drivers/leds/leds-menf21bmc.c | 131 ++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 138 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
> + 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..4621f72
> --- /dev/null
> +++ b/drivers/leds/leds-menf21bmc.c
> @@ -0,0 +1,131 @@
> +/*
> + * 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
> + *
> + * 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,
> + },
> +};
> +
I still think this driver should be an I2C driver which is simply than
a platform driver.
Did I miss some discussion about this in our email?
Thanks,
-Bryan
> +module_platform_driver(menf21bmc_led);
> +
> +MODULE_AUTHOR("Andreas Werner <andreas.werner@....de>");
> +MODULE_DESCRIPTION("MEN 14F021P00 BMC led driver");
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("platform:menf21bmc_led");
> --
> 2.0.4
>
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