drivers/leds/leds-apu.c - linux - Git at Google

 /*
  * 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.
  */

 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

 #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)

 /* 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 */
 };

 struct apu_led_pdata {
 	struct platform_device *pdev;
 	struct apu_led_priv *pled;
 	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 dmi_system_id apu_led_dmi_table[] __initconst = {
 	/* PC Engines APU with factory bios "SageBios_PCEngines_APU-45" */
 	{
 		.ident = "apu",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "APU")
 		}
 	},
 	/* PC Engines APU with "Mainline" bios >= 4.6.8 */
 	{
 		.ident = "apu",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "apu1")
 		}
 	},
 	{}
 };
 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 int apu_led_config(struct device *dev, struct apu_led_pdata *apuld)
 {
 	int i;
 	int err;

 	apu_led->pled = devm_kcalloc(dev,
 		ARRAY_SIZE(apu1_led_profile), sizeof(struct apu_led_priv),
 		GFP_KERNEL);

 	if (!apu_led->pled)
 		return -ENOMEM;

 	for (i = 0; i < ARRAY_SIZE(apu1_led_profile); i++) {
 		struct apu_led_priv *pled = &apu_led->pled[i];
 		struct led_classdev *led_cdev = &pled->cdev;

 		led_cdev->name = apu1_led_profile[i].name;
 		led_cdev->brightness = apu1_led_profile[i].brightness;
 		led_cdev->max_brightness = 1;
 		led_cdev->flags = LED_CORE_SUSPENDRESUME;
 		led_cdev->brightness_set = apu1_led_brightness_set;

 		pled->param.addr = devm_ioremap(dev,
 				apu1_led_profile[i].offset, APU1_IOSIZE);
 		if (!pled->param.addr) {
 			err = -ENOMEM;
 			goto error;
 		}

 		err = led_classdev_register(dev, led_cdev);
 		if (err)
 			goto error;

 		apu1_led_brightness_set(led_cdev, apu1_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;

 	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_check_system(apu_led_dmi_table)) {
 		pr_err("No PC Engines APUv1 board detected. For APUv2,3 support, enable CONFIG_PCENGINES_APU2\n");
 		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 < ARRAY_SIZE(apu1_led_profile); 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 APU1 front LED driver");
 MODULE_LICENSE("GPL v2");
 MODULE_ALIAS("platform:leds_apu");
	/*
	* 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.
	*/

	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

	#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)

	/* 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 */
	};

	struct apu_led_pdata {
	struct platform_device *pdev;
	struct apu_led_priv *pled;
	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 dmi_system_id apu_led_dmi_table[] __initconst = {
	/* PC Engines APU with factory bios "SageBios_PCEngines_APU-45" */
	{
	.ident = "apu",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
	DMI_MATCH(DMI_PRODUCT_NAME, "APU")
	}
	},
	/* PC Engines APU with "Mainline" bios >= 4.6.8 */
	{
	.ident = "apu",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
	DMI_MATCH(DMI_PRODUCT_NAME, "apu1")
	}
	},
	{}
	};
	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 int apu_led_config(struct device dev, struct apu_led_pdata apuld)
	{
	int i;
	int err;

	apu_led->pled = devm_kcalloc(dev,
	ARRAY_SIZE(apu1_led_profile), sizeof(struct apu_led_priv),
	GFP_KERNEL);

	if (!apu_led->pled)
	return -ENOMEM;

	for (i = 0; i < ARRAY_SIZE(apu1_led_profile); i++) {
	struct apu_led_priv *pled = &apu_led->pled[i];
	struct led_classdev *led_cdev = &pled->cdev;

	led_cdev->name = apu1_led_profile[i].name;
	led_cdev->brightness = apu1_led_profile[i].brightness;
	led_cdev->max_brightness = 1;
	led_cdev->flags = LED_CORE_SUSPENDRESUME;
	led_cdev->brightness_set = apu1_led_brightness_set;

	pled->param.addr = devm_ioremap(dev,
	apu1_led_profile[i].offset, APU1_IOSIZE);
	if (!pled->param.addr) {
	err = -ENOMEM;
	goto error;
	}

	err = led_classdev_register(dev, led_cdev);
	if (err)
	goto error;

	apu1_led_brightness_set(led_cdev, apu1_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;

	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_check_system(apu_led_dmi_table)) {
	pr_err("No PC Engines APUv1 board detected. For APUv2,3 support, enable CONFIG_PCENGINES_APU2\n");
	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 < ARRAY_SIZE(apu1_led_profile); 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 APU1 front LED driver");
	MODULE_LICENSE("GPL v2");
	MODULE_ALIAS("platform:leds_apu");