--- /dev/null
+/*
+ * 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");
projects / linux.git / commitdiff