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![Andreas Eberlein](/assets/img/avatar_default.png)
The DMI_PRODUCT_NAME entry on current firmware of PC Engines APU1 changed from "APU" to "apu1" This modification adds the missing DMI data and thereby the LED support for the PC Engines APU1 with firmware versions >= 4.6.8. Signed-off-by: Andreas Eberlein <foodeas@aeberlein.de> Tested-by: Zbyněk Kocur <zbynek.kocur@fel.cvut.cz> Signed-off-by: Pavel Machek <pavel@ucw.cz>
222 lines
6.2 KiB
C
222 lines
6.2 KiB
C
/*
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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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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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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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/* 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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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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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 dmi_system_id apu_led_dmi_table[] __initconst = {
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/* PC Engines APU with factory bios "SageBios_PCEngines_APU-45" */
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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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/* PC Engines APU with "Mainline" bios >= 4.6.8 */
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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, "apu1")
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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 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_kcalloc(dev,
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ARRAY_SIZE(apu1_led_profile), sizeof(struct apu_led_priv),
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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 < ARRAY_SIZE(apu1_led_profile); 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 = apu1_led_profile[i].name;
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led_cdev->brightness = apu1_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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led_cdev->brightness_set = apu1_led_brightness_set;
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pled->param.addr = devm_ioremap(dev,
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apu1_led_profile[i].offset, APU1_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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apu1_led_brightness_set(led_cdev, apu1_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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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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(dmi_match(DMI_PRODUCT_NAME, "APU") || dmi_match(DMI_PRODUCT_NAME, "apu1")))) {
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pr_err("No PC Engines APUv1 board detected. For APUv2,3 support, enable CONFIG_PCENGINES_APU2\n");
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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 < ARRAY_SIZE(apu1_led_profile); 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 APU1 front LED driver");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:leds_apu");
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