leds: Add driver for PC Engines APU/APU2 LEDs (3faee942) · Commits · 戴 / test

drivers/leds/Kconfig

+10 −0

Original line number	Original line	Diff line number	Diff line
	@@ -57,6 +57,16 @@ config LEDS_AAT1290
	depends on PINCTRL		depends on PINCTRL
	help		help
	This option enables support for the LEDs on the AAT1290.		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		config LEDS_AS3645A
	tristate "AS3645A LED flash controller support"		tristate "AS3645A LED flash controller support"

drivers/leds/Makefile

+1 −0

Original line number	Original line	Diff line number	Diff line
	@@ -8,6 +8,7 @@ obj-$(CONFIG_LEDS_TRIGGERS) += led-triggers.o
	# LED Platform Drivers		# LED Platform Drivers
	obj-$(CONFIG_LEDS_88PM860X) += leds-88pm860x.o		obj-$(CONFIG_LEDS_88PM860X) += leds-88pm860x.o
	obj-$(CONFIG_LEDS_AAT1290) += leds-aat1290.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_AS3645A) += leds-as3645a.o
	obj-$(CONFIG_LEDS_BCM6328) += leds-bcm6328.o		obj-$(CONFIG_LEDS_BCM6328) += leds-bcm6328.o
	obj-$(CONFIG_LEDS_BCM6358) += leds-bcm6358.o		obj-$(CONFIG_LEDS_BCM6358) += leds-bcm6358.o

drivers/leds/leds-apu.c

0 → 100644

+278 −0

Original line number	Original line	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");

Admin message