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: Alan Mizrahi <alan@mizrahi.com.ve> Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
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3faee9423c
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@ -57,6 +57,16 @@ config LEDS_AAT1290
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depends on PINCTRL
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help
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This option enables support for the LEDs on the AAT1290.
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config LEDS_APU
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tristate "Front panel LED support for PC Engines APU/APU2 boards"
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depends on LEDS_CLASS
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depends on X86 && DMI
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help
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This driver makes the PC Engines APU/APU2 front panel LEDs
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accessible from userspace programs through the LED subsystem.
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To compile this driver as a module, choose M here: the
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module will be called leds-apu.
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config LEDS_AS3645A
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tristate "AS3645A LED flash controller support"
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@ -8,6 +8,7 @@ obj-$(CONFIG_LEDS_TRIGGERS) += led-triggers.o
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# LED Platform Drivers
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obj-$(CONFIG_LEDS_88PM860X) += leds-88pm860x.o
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obj-$(CONFIG_LEDS_AAT1290) += leds-aat1290.o
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obj-$(CONFIG_LEDS_APU) += leds-apu.o
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obj-$(CONFIG_LEDS_AS3645A) += leds-as3645a.o
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obj-$(CONFIG_LEDS_BCM6328) += leds-bcm6328.o
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obj-$(CONFIG_LEDS_BCM6358) += leds-bcm6358.o
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278
drivers/leds/leds-apu.c
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278
drivers/leds/leds-apu.c
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@ -0,0 +1,278 @@
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/*
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* drivers/leds/leds-apu.c
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* Copyright (C) 2017 Alan Mizrahi, alan at mizrahi dot com dot ve
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the names of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <linux/dmi.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/leds.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#define APU1_FCH_ACPI_MMIO_BASE 0xFED80000
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#define APU1_FCH_GPIO_BASE (APU1_FCH_ACPI_MMIO_BASE + 0x01BD)
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#define APU1_LEDON 0x08
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#define APU1_LEDOFF 0xC8
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#define APU1_NUM_GPIO 3
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#define APU1_IOSIZE sizeof(u8)
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#define APU2_FCH_ACPI_MMIO_BASE 0xFED80000
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#define APU2_FCH_GPIO_BASE (APU2_FCH_ACPI_MMIO_BASE + 0x1500)
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#define APU2_GPIO_BIT_WRITE 22
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#define APU2_APU2_NUM_GPIO 4
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#define APU2_IOSIZE sizeof(u32)
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/* LED access parameters */
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struct apu_param {
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void __iomem *addr; /* for ioread/iowrite */
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};
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/* LED private data */
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struct apu_led_priv {
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struct led_classdev cdev;
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struct apu_param param;
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};
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#define cdev_to_priv(c) container_of(c, struct apu_led_priv, cdev)
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/* LED profile */
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struct apu_led_profile {
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const char *name;
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enum led_brightness brightness;
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unsigned long offset; /* for devm_ioremap */
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};
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/* Supported platform types */
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enum apu_led_platform_types {
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APU1_LED_PLATFORM,
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APU2_LED_PLATFORM,
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};
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struct apu_led_pdata {
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struct platform_device *pdev;
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struct apu_led_priv *pled;
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const struct apu_led_profile *profile;
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enum apu_led_platform_types platform;
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int num_led_instances;
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int iosize; /* for devm_ioremap() */
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spinlock_t lock;
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};
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static struct apu_led_pdata *apu_led;
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static const struct apu_led_profile apu1_led_profile[] = {
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{ "apu:green:1", LED_ON, APU1_FCH_GPIO_BASE + 0 * APU1_IOSIZE },
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{ "apu:green:2", LED_OFF, APU1_FCH_GPIO_BASE + 1 * APU1_IOSIZE },
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{ "apu:green:3", LED_OFF, APU1_FCH_GPIO_BASE + 2 * APU1_IOSIZE },
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};
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static const struct apu_led_profile apu2_led_profile[] = {
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{ "apu2:green:1", LED_ON, APU2_FCH_GPIO_BASE + 68 * APU2_IOSIZE },
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{ "apu2:green:2", LED_OFF, APU2_FCH_GPIO_BASE + 69 * APU2_IOSIZE },
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{ "apu2:green:3", LED_OFF, APU2_FCH_GPIO_BASE + 70 * APU2_IOSIZE },
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};
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static const struct dmi_system_id apu_led_dmi_table[] __initconst = {
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{
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.ident = "apu",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
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DMI_MATCH(DMI_PRODUCT_NAME, "APU")
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}
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},
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{
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.ident = "apu2",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
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DMI_MATCH(DMI_BOARD_NAME, "APU2")
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}
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},
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{}
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};
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MODULE_DEVICE_TABLE(dmi, apu_led_dmi_table);
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static void apu1_led_brightness_set(struct led_classdev *led, enum led_brightness value)
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{
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struct apu_led_priv *pled = cdev_to_priv(led);
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spin_lock(&apu_led->lock);
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iowrite8(value ? APU1_LEDON : APU1_LEDOFF, pled->param.addr);
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spin_unlock(&apu_led->lock);
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}
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static void apu2_led_brightness_set(struct led_classdev *led, enum led_brightness value)
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{
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struct apu_led_priv *pled = cdev_to_priv(led);
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u32 value_new;
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spin_lock(&apu_led->lock);
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value_new = ioread32(pled->param.addr);
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if (value)
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value_new &= ~BIT(APU2_GPIO_BIT_WRITE);
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else
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value_new |= BIT(APU2_GPIO_BIT_WRITE);
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iowrite32(value_new, pled->param.addr);
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spin_unlock(&apu_led->lock);
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}
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static int apu_led_config(struct device *dev, struct apu_led_pdata *apuld)
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{
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int i;
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int err;
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apu_led->pled = devm_kzalloc(dev,
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sizeof(struct apu_led_priv) * apu_led->num_led_instances,
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GFP_KERNEL);
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if (!apu_led->pled)
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return -ENOMEM;
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for (i = 0; i < apu_led->num_led_instances; i++) {
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struct apu_led_priv *pled = &apu_led->pled[i];
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struct led_classdev *led_cdev = &pled->cdev;
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led_cdev->name = apu_led->profile[i].name;
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led_cdev->brightness = apu_led->profile[i].brightness;
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led_cdev->max_brightness = 1;
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led_cdev->flags = LED_CORE_SUSPENDRESUME;
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if (apu_led->platform == APU1_LED_PLATFORM)
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led_cdev->brightness_set = apu1_led_brightness_set;
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else if (apu_led->platform == APU2_LED_PLATFORM)
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led_cdev->brightness_set = apu2_led_brightness_set;
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pled->param.addr = devm_ioremap(dev,
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apu_led->profile[i].offset, apu_led->iosize);
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if (!pled->param.addr) {
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err = -ENOMEM;
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goto error;
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}
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err = led_classdev_register(dev, led_cdev);
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if (err)
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goto error;
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led_cdev->brightness_set(led_cdev, apu_led->profile[i].brightness);
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}
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return 0;
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error:
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while (i-- > 0)
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led_classdev_unregister(&apu_led->pled[i].cdev);
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return err;
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}
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static int __init apu_led_probe(struct platform_device *pdev)
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{
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apu_led = devm_kzalloc(&pdev->dev, sizeof(*apu_led), GFP_KERNEL);
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if (!apu_led)
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return -ENOMEM;
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apu_led->pdev = pdev;
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if (dmi_match(DMI_BOARD_NAME, "APU")) {
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apu_led->profile = apu1_led_profile;
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apu_led->platform = APU1_LED_PLATFORM;
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apu_led->num_led_instances = ARRAY_SIZE(apu1_led_profile);
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apu_led->iosize = APU1_IOSIZE;
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} else if (dmi_match(DMI_BOARD_NAME, "APU2")) {
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apu_led->profile = apu2_led_profile;
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apu_led->platform = APU2_LED_PLATFORM;
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apu_led->num_led_instances = ARRAY_SIZE(apu2_led_profile);
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apu_led->iosize = APU2_IOSIZE;
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}
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spin_lock_init(&apu_led->lock);
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return apu_led_config(&pdev->dev, apu_led);
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}
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static struct platform_driver apu_led_driver = {
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.driver = {
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.name = KBUILD_MODNAME,
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},
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};
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static int __init apu_led_init(void)
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{
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struct platform_device *pdev;
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int err;
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if (!dmi_match(DMI_SYS_VENDOR, "PC Engines")) {
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pr_err("No PC Engines board detected\n");
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return -ENODEV;
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}
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if (!(dmi_match(DMI_PRODUCT_NAME, "APU") || dmi_match(DMI_PRODUCT_NAME, "APU2"))) {
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pr_err("Unknown PC Engines board: %s\n",
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dmi_get_system_info(DMI_PRODUCT_NAME));
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return -ENODEV;
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}
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pdev = platform_device_register_simple(KBUILD_MODNAME, -1, NULL, 0);
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if (IS_ERR(pdev)) {
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pr_err("Device allocation failed\n");
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return PTR_ERR(pdev);
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}
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err = platform_driver_probe(&apu_led_driver, apu_led_probe);
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if (err) {
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pr_err("Probe platform driver failed\n");
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platform_device_unregister(pdev);
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}
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return err;
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}
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static void __exit apu_led_exit(void)
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{
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int i;
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for (i = 0; i < apu_led->num_led_instances; i++)
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led_classdev_unregister(&apu_led->pled[i].cdev);
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platform_device_unregister(apu_led->pdev);
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platform_driver_unregister(&apu_led_driver);
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}
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module_init(apu_led_init);
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module_exit(apu_led_exit);
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MODULE_AUTHOR("Alan Mizrahi");
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MODULE_DESCRIPTION("PC Engines APU family LED driver");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:leds_apu");
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