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Commit 3faee942 authored by Alan Mizrahi's avatar Alan Mizrahi Committed by Jacek Anaszewski
Browse files

leds: Add driver for PC Engines APU/APU2 LEDs 



This patch implements the driver to support the front panel LEDs
for PC Engines APU and APU2 boards.

Signed-off-by: default avatarAlan Mizrahi <alan@mizrahi.com.ve>
Signed-off-by: default avatarJacek Anaszewski <jacek.anaszewski@gmail.com>
parent f2ea85d7

drivers/leds/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -57,6 +57,16 @@ config LEDS_AAT1290 
	depends on PINCTRL

	help

	 This option enables support for the LEDs on the AAT1290.

config LEDS_APU

	tristate "Front panel LED support for PC Engines APU/APU2 boards"

	depends on LEDS_CLASS

	depends on X86 && DMI

	help

	  This driver makes the PC Engines APU/APU2 front panel LEDs

	  accessible from userspace programs through the LED subsystem.



	  To compile this driver as a module, choose M here: the

	  module will be called leds-apu.



config LEDS_AS3645A

	tristate "AS3645A LED flash controller support"

drivers/leds/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ obj-$(CONFIG_LEDS_TRIGGERS) += led-triggers.o 
# LED Platform Drivers

obj-$(CONFIG_LEDS_88PM860X)		+= leds-88pm860x.o

obj-$(CONFIG_LEDS_AAT1290)		+= leds-aat1290.o

obj-$(CONFIG_LEDS_APU)			+= leds-apu.o

obj-$(CONFIG_LEDS_AS3645A)		+= leds-as3645a.o

obj-$(CONFIG_LEDS_BCM6328)		+= leds-bcm6328.o

obj-$(CONFIG_LEDS_BCM6358)		+= leds-bcm6358.o

drivers/leds/leds-apu.c

0 → 100644
+278 −0
Original line number Diff line number Diff line 
/*

 * drivers/leds/leds-apu.c

 * Copyright (C) 2017 Alan Mizrahi, alan at mizrahi dot com dot ve

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. Neither the names of the copyright holders nor the names of its

 *    contributors may be used to endorse or promote products derived from

 *    this software without specific prior written permission.

 *

 * Alternatively, this software may be distributed under the terms of the

 * GNU General Public License ("GPL") version 2 as published by the Free

 * Software Foundation.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE

 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGE.

 */



#include <linux/dmi.h>

#include <linux/err.h>

#include <linux/init.h>

#include <linux/io.h>

#include <linux/kernel.h>

#include <linux/leds.h>

#include <linux/module.h>

#include <linux/platform_device.h>



#define APU1_FCH_ACPI_MMIO_BASE 0xFED80000

#define APU1_FCH_GPIO_BASE      (APU1_FCH_ACPI_MMIO_BASE + 0x01BD)

#define APU1_LEDON              0x08

#define APU1_LEDOFF             0xC8

#define APU1_NUM_GPIO           3

#define APU1_IOSIZE             sizeof(u8)



#define APU2_FCH_ACPI_MMIO_BASE 0xFED80000

#define APU2_FCH_GPIO_BASE      (APU2_FCH_ACPI_MMIO_BASE + 0x1500)

#define APU2_GPIO_BIT_WRITE     22

#define APU2_APU2_NUM_GPIO      4

#define APU2_IOSIZE             sizeof(u32)



/* LED access parameters */

struct apu_param {

	void __iomem *addr; /* for ioread/iowrite */

};



/* LED private data */

struct apu_led_priv {

	struct led_classdev cdev;

	struct apu_param param;

};

#define cdev_to_priv(c) container_of(c, struct apu_led_priv, cdev)



/* LED profile */

struct apu_led_profile {

	const char *name;

	enum led_brightness brightness;

	unsigned long offset; /* for devm_ioremap */

};



/* Supported platform types */

enum apu_led_platform_types {

	APU1_LED_PLATFORM,

	APU2_LED_PLATFORM,

};



struct apu_led_pdata {

	struct platform_device *pdev;

	struct apu_led_priv *pled;

	const struct apu_led_profile *profile;

	enum apu_led_platform_types platform;

	int num_led_instances;

	int iosize; /* for devm_ioremap() */

	spinlock_t lock;

};



static struct apu_led_pdata *apu_led;



static const struct apu_led_profile apu1_led_profile[] = {

	{ "apu:green:1", LED_ON,  APU1_FCH_GPIO_BASE + 0 * APU1_IOSIZE },

	{ "apu:green:2", LED_OFF, APU1_FCH_GPIO_BASE + 1 * APU1_IOSIZE },

	{ "apu:green:3", LED_OFF, APU1_FCH_GPIO_BASE + 2 * APU1_IOSIZE },

};



static const struct apu_led_profile apu2_led_profile[] = {

	{ "apu2:green:1", LED_ON,  APU2_FCH_GPIO_BASE + 68 * APU2_IOSIZE },

	{ "apu2:green:2", LED_OFF, APU2_FCH_GPIO_BASE + 69 * APU2_IOSIZE },

	{ "apu2:green:3", LED_OFF, APU2_FCH_GPIO_BASE + 70 * APU2_IOSIZE },

};



static const struct dmi_system_id apu_led_dmi_table[] __initconst = {

	{

		.ident = "apu",

		.matches = {

			DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),

			DMI_MATCH(DMI_PRODUCT_NAME, "APU")

		}

	},

	{

		.ident = "apu2",

		.matches = {

			DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),

			DMI_MATCH(DMI_BOARD_NAME, "APU2")

		}

	},

	{}

};

MODULE_DEVICE_TABLE(dmi, apu_led_dmi_table);



static void apu1_led_brightness_set(struct led_classdev *led, enum led_brightness value)

{

	struct apu_led_priv *pled = cdev_to_priv(led);



	spin_lock(&apu_led->lock);

	iowrite8(value ? APU1_LEDON : APU1_LEDOFF, pled->param.addr);

	spin_unlock(&apu_led->lock);

}



static void apu2_led_brightness_set(struct led_classdev *led, enum led_brightness value)

{

	struct apu_led_priv *pled = cdev_to_priv(led);

	u32 value_new;



	spin_lock(&apu_led->lock);



	value_new = ioread32(pled->param.addr);



	if (value)

		value_new &= ~BIT(APU2_GPIO_BIT_WRITE);

	else

		value_new |= BIT(APU2_GPIO_BIT_WRITE);



	iowrite32(value_new, pled->param.addr);



	spin_unlock(&apu_led->lock);

}



static int apu_led_config(struct device *dev, struct apu_led_pdata *apuld)

{

	int i;

	int err;



	apu_led->pled = devm_kzalloc(dev,

		sizeof(struct apu_led_priv) * apu_led->num_led_instances,

		GFP_KERNEL);



	if (!apu_led->pled)

		return -ENOMEM;



	for (i = 0; i < apu_led->num_led_instances; i++) {

		struct apu_led_priv *pled = &apu_led->pled[i];

		struct led_classdev *led_cdev = &pled->cdev;



		led_cdev->name = apu_led->profile[i].name;

		led_cdev->brightness = apu_led->profile[i].brightness;

		led_cdev->max_brightness = 1;

		led_cdev->flags = LED_CORE_SUSPENDRESUME;

		if (apu_led->platform == APU1_LED_PLATFORM)

			led_cdev->brightness_set = apu1_led_brightness_set;

		else if (apu_led->platform == APU2_LED_PLATFORM)

			led_cdev->brightness_set = apu2_led_brightness_set;



		pled->param.addr = devm_ioremap(dev,

				apu_led->profile[i].offset, apu_led->iosize);

		if (!pled->param.addr) {

			err = -ENOMEM;

			goto error;

		}



		err = led_classdev_register(dev, led_cdev);

		if (err)

			goto error;



		led_cdev->brightness_set(led_cdev, apu_led->profile[i].brightness);

	}



	return 0;



error:

	while (i-- > 0)

		led_classdev_unregister(&apu_led->pled[i].cdev);



	return err;

}



static int __init apu_led_probe(struct platform_device *pdev)

{

	apu_led = devm_kzalloc(&pdev->dev, sizeof(*apu_led), GFP_KERNEL);



	if (!apu_led)

		return -ENOMEM;



	apu_led->pdev = pdev;



	if (dmi_match(DMI_BOARD_NAME, "APU")) {

		apu_led->profile = apu1_led_profile;

		apu_led->platform = APU1_LED_PLATFORM;

		apu_led->num_led_instances = ARRAY_SIZE(apu1_led_profile);

		apu_led->iosize = APU1_IOSIZE;

	} else if (dmi_match(DMI_BOARD_NAME, "APU2")) {

		apu_led->profile = apu2_led_profile;

		apu_led->platform = APU2_LED_PLATFORM;

		apu_led->num_led_instances = ARRAY_SIZE(apu2_led_profile);

		apu_led->iosize = APU2_IOSIZE;

	}



	spin_lock_init(&apu_led->lock);

	return apu_led_config(&pdev->dev, apu_led);

}



static struct platform_driver apu_led_driver = {

	.driver = {

		.name = KBUILD_MODNAME,

	},

};



static int __init apu_led_init(void)

{

	struct platform_device *pdev;

	int err;



	if (!dmi_match(DMI_SYS_VENDOR, "PC Engines")) {

		pr_err("No PC Engines board detected\n");

		return -ENODEV;

	}

	if (!(dmi_match(DMI_PRODUCT_NAME, "APU") || dmi_match(DMI_PRODUCT_NAME, "APU2"))) {

		pr_err("Unknown PC Engines board: %s\n",

				dmi_get_system_info(DMI_PRODUCT_NAME));

		return -ENODEV;

	}



	pdev = platform_device_register_simple(KBUILD_MODNAME, -1, NULL, 0);

	if (IS_ERR(pdev)) {

		pr_err("Device allocation failed\n");

		return PTR_ERR(pdev);

	}



	err = platform_driver_probe(&apu_led_driver, apu_led_probe);

	if (err) {

		pr_err("Probe platform driver failed\n");

		platform_device_unregister(pdev);

	}



	return err;

}



static void __exit apu_led_exit(void)

{

	int i;



	for (i = 0; i < apu_led->num_led_instances; i++)

		led_classdev_unregister(&apu_led->pled[i].cdev);



	platform_device_unregister(apu_led->pdev);

	platform_driver_unregister(&apu_led_driver);

}



module_init(apu_led_init);

module_exit(apu_led_exit);



MODULE_AUTHOR("Alan Mizrahi");

MODULE_DESCRIPTION("PC Engines APU family LED driver");

MODULE_LICENSE("GPL v2");

MODULE_ALIAS("platform:leds_apu");