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Message-ID: <20140725093728.GA1371@awelinux> Date: Fri, 25 Jul 2014 11:37:29 +0200 From: Andreas Werner <andreas.werner@....de> To: Bryan Wu <cooloney@...il.com> CC: Andreas Werner <andreas.werner@....de>, 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>, <wim@...ana.be>, <linux-watchdog@...r.kernel.org> Subject: Re: [PATCH v3 3/3] drivers/leds/leds-menf21bmc: introduce MEN 14F021P00 BMC LED driver 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? > > 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 -- 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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