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222 lines
6.2 KiB
222 lines
6.2 KiB
/* |
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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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