This adds support for the PCB LEDs and Reset Button found on the PC
Engines APU2/APU3 embedded boards.

Signed-off-by: Chris Blake <chrisrblak...@gmail.com>
---
 package/kernel/leds-apu2/Makefile        |  52 +++++
 package/kernel/leds-apu2/src/Kconfig     |   8 +
 package/kernel/leds-apu2/src/Makefile    |   1 +
 package/kernel/leds-apu2/src/leds-apu2.c | 374 +++++++++++++++++++++++++++++++
 4 files changed, 435 insertions(+)
 create mode 100644 package/kernel/leds-apu2/Makefile
 create mode 100644 package/kernel/leds-apu2/src/Kconfig
 create mode 100644 package/kernel/leds-apu2/src/Makefile
 create mode 100644 package/kernel/leds-apu2/src/leds-apu2.c

diff --git a/package/kernel/leds-apu2/Makefile 
b/package/kernel/leds-apu2/Makefile
new file mode 100644
index 0000000..bab2315
--- /dev/null
+++ b/package/kernel/leds-apu2/Makefile
@@ -0,0 +1,52 @@
+#
+# Copyright (C) 2017 Chris Blake <chrisrblak...@gmail.com>
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+include $(TOPDIR)/rules.mk
+include $(INCLUDE_DIR)/kernel.mk
+
+PKG_NAME:=leds-apu2
+PKG_RELEASE:=1
+
+PKG_MAINTAINER:=Chris Blake <chrisrblak...@gmail.com>
+PKG_LICENSE:=GPL-2.0
+
+include $(INCLUDE_DIR)/package.mk
+
+define KernelPackage/leds-apu2
+  SUBMENU:=LED modules
+  TITLE:= PC Engines APU2/APU3 LED support
+  DEPENDS:= @GPIO_SUPPORT @TARGET_x86
+  FILES:=$(PKG_BUILD_DIR)/leds-apu2.ko
+  AUTOLOAD:=$(call AutoLoad,41,leds-apu2,1)
+  KCONFIG:=
+endef
+
+define KernelPackage/leds-apu2/description
+  Driver for the PC Engines APU2/APU3 LEDs & Reset Button.
+endef
+
+EXTRA_KCONFIG:= \
+       CONFIG_LEDS_APU2=m
+
+EXTRA_CFLAGS:= \
+       $(patsubst CONFIG_%, -DCONFIG_%=1, $(patsubst %=m,%,$(filter 
%=m,$(EXTRA_KCONFIG)))) \
+       $(patsubst CONFIG_%, -DCONFIG_%=1, $(patsubst %=y,%,$(filter 
%=y,$(EXTRA_KCONFIG)))) \
+
+MAKE_OPTS:= \
+       ARCH="$(LINUX_KARCH)" \
+       CROSS_COMPILE="$(TARGET_CROSS)" \
+       SUBDIRS="$(PKG_BUILD_DIR)" \
+       EXTRA_CFLAGS="$(EXTRA_CFLAGS)" \
+       $(EXTRA_KCONFIG)
+
+define Build/Compile
+        $(MAKE) -C "$(LINUX_DIR)" \
+               $(MAKE_OPTS) \
+               modules
+endef
+
+$(eval $(call KernelPackage,leds-apu2))
diff --git a/package/kernel/leds-apu2/src/Kconfig 
b/package/kernel/leds-apu2/src/Kconfig
new file mode 100644
index 0000000..d0ad5be
--- /dev/null
+++ b/package/kernel/leds-apu2/src/Kconfig
@@ -0,0 +1,8 @@
+config LEDS_APU2
+        tristate "PC Engines APU2/APU3 LED support"
+        depends on LEDS_CLASS
+        depends on LEDS_GPIO
+        depends on GPIOLIB
+        help
+          Say yes here to enable support for the CPU GPIO pins on the PC 
Engines
+          APU2/APU3 board, which enables the front LEDs and Reset Button.
diff --git a/package/kernel/leds-apu2/src/Makefile 
b/package/kernel/leds-apu2/src/Makefile
new file mode 100644
index 0000000..4f77b39
--- /dev/null
+++ b/package/kernel/leds-apu2/src/Makefile
@@ -0,0 +1 @@
+obj-${CONFIG_LEDS_APU2}    += leds-apu2.o
diff --git a/package/kernel/leds-apu2/src/leds-apu2.c 
b/package/kernel/leds-apu2/src/leds-apu2.c
new file mode 100644
index 0000000..8da8a2d
--- /dev/null
+++ b/package/kernel/leds-apu2/src/leds-apu2.c
@@ -0,0 +1,374 @@
+/*
+ *  APU2 LED/GPIO Driver
+ *  Copyright (c) 2016 Christian Lamparter <chunkeey (at) googlemail.com>
+ *
+ *  Based on gpio-apu2.c - AMD FCH GPIO support for PC-Engines APU-2 board
+ *
+ *  Copyright (c) 2015  Carsten Spiess <fli4l at carsten-spiess.de>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+ #include <linux/module.h>
+ #include <linux/types.h>
+ #include <linux/miscdevice.h>
+ #include <linux/gpio.h>
+ #include <linux/init.h>
+ #include <linux/pci.h>
+ #include <linux/ioport.h>
+ #include <linux/platform_device.h>
+ #include <linux/uaccess.h>
+ #include <linux/io.h>
+ #include <linux/version.h>
+ #include <linux/dmi.h>
+ #include <linux/string.h>
+
+ #include <linux/leds.h>
+ #include <linux/input.h>
+ #include <linux/gpio_keys.h>
+
+ #define DEVNAME                 "leds-apu2"
+
+ #define FCH_ACPI_MMIO_BASE      0xFED80000
+ #define FCH_GPIO_BASE           (FCH_ACPI_MMIO_BASE + 0x1500)
+ #define FCH_GPIO_SIZE           0x300
+
+ #define APU_NUM_GPIO            4
+
+ #define GPIO_BIT_DIR            23
+ #define GPIO_BIT_WRITE          22
+ #define GPIO_BIT_READ           16
+
+ /* internal variables */
+ static struct pci_dev *gpio_apu2_pci;
+ static DEFINE_SPINLOCK (gpio_lock);
+
+ /* the watchdog platform device */
+ static struct platform_device *gpio_apu2_platform_device;
+ static struct platform_device *leddev;
+ static struct platform_device *keydev;
+
+ static const struct pci_device_id gpio_apu2_pci_tbl[] ={
+       {PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_HUDSON2_SMBUS, PCI_ANY_ID, 
PCI_ANY_ID},
+       { 0, } /* End of list */
+ };
+ MODULE_DEVICE_TABLE (pci, gpio_apu2_pci_tbl);
+
+ /* EGPIO89=GPIO32, AGPIO68=GPIO57, AGPIO69=GPIO58, AGPIO70=GPIO59 */
+ static u8 gpio_offset[APU_NUM_GPIO] = {89, 68, 69, 70};
+
+ static void __iomem *gpio_addr[APU_NUM_GPIO] = {NULL, NULL, NULL, NULL};
+
+ static int gpio_apu2_get_dir (struct gpio_chip *chip, unsigned offset)
+ {
+       u32 val;
+
+       val = ~ioread32 (gpio_addr[offset]);
+
+       return (val >> GPIO_BIT_DIR) & 1;
+ }
+
+ static int gpio_apu2_dir_in (struct gpio_chip *gc, unsigned offset)
+ {
+       u32 val;
+
+       spin_lock_bh (&gpio_lock);
+
+       val = ioread32 (gpio_addr[offset]);
+       val &= ~BIT(GPIO_BIT_DIR);
+       iowrite32 (val, gpio_addr[offset]);
+
+       spin_unlock_bh (&gpio_lock);
+
+       return 0;
+ }
+
+ static int gpio_apu2_dir_out (struct gpio_chip *chip, unsigned offset,
+               int value)
+ {
+       u32 val;
+
+       spin_lock_bh (&gpio_lock);
+
+       val = ioread32 (gpio_addr[offset]);
+       val |= BIT(GPIO_BIT_DIR);
+       iowrite32 (val, gpio_addr[offset]);
+
+       spin_unlock_bh (&gpio_lock);
+
+       return 0;
+ }
+
+ static int gpio_apu2_get_data (struct gpio_chip *chip, unsigned offset)
+ {
+       u32 val;
+
+       val = ioread32 (gpio_addr[offset]);
+
+       return (val >> GPIO_BIT_READ) & 1;
+ }
+
+ static void gpio_apu2_set_data (struct gpio_chip *chip, unsigned offset, int 
value)
+ {
+       u32 val;
+
+       spin_lock_bh (&gpio_lock);
+
+       val = ioread32 (gpio_addr[offset]);
+
+       if (value)
+               val |= BIT(GPIO_BIT_WRITE);
+       else
+               val &= ~BIT(GPIO_BIT_WRITE);
+
+       iowrite32 (val, gpio_addr[offset]);
+
+       spin_unlock_bh (&gpio_lock);
+ }
+
+ static struct gpio_chip gpio_apu2_chip = {
+       .label = DEVNAME,
+       .owner = THIS_MODULE,
+       .base = -1,
+       .ngpio = APU_NUM_GPIO,
+       .get_direction = gpio_apu2_get_dir,
+       .direction_input = gpio_apu2_dir_in,
+       .direction_output = gpio_apu2_dir_out,
+       .get = gpio_apu2_get_data,
+       .set = gpio_apu2_set_data,
+ };
+
+ /*
+  *
+  */
+ static int gpio_apu2_probe (struct platform_device *dev)
+ {
+       int ret = 0;
+       int i;
+       struct pci_dev *pci_dev = NULL;
+
+       /* Match the PCI device */
+       for_each_pci_dev (pci_dev) {
+               if (pci_match_id (gpio_apu2_pci_tbl, pci_dev) != NULL) {
+                       gpio_apu2_pci = pci_dev;
+                       break;
+               }
+       }
+
+       if (!gpio_apu2_pci)
+               return -ENODEV;
+
+       pr_info ("%s: PCI Revision ID: 0x%x\n", DEVNAME, 
gpio_apu2_pci->revision);
+
+       /* Determine type of southbridge chipset */
+       if (gpio_apu2_pci->revision < 0x40) {
+               return -EACCES;
+       }
+
+       /* Request memory region for GPIO's */
+       if (!devm_request_mem_region (&dev->dev, FCH_GPIO_BASE,
+               FCH_GPIO_SIZE, DEVNAME)){
+               pr_err ("%s: request GPIO mem region failed\n", DEVNAME);
+               return -ENXIO;
+       }
+
+       /* Map IO's for GPIO's */
+       for (i = 0; i < APU_NUM_GPIO; i++) {
+               gpio_addr[i] = devm_ioremap (&dev->dev,
+                       FCH_GPIO_BASE + (gpio_offset[i] * sizeof (u32)), sizeof 
(u32));
+               if (!gpio_addr[i]) {
+                       pr_err ("%s: map GPIO%d address failed\n", DEVNAME, 
gpio_offset[i]);
+                       return -ENXIO;
+               }
+       }
+
+       gpio_apu2_chip.dev = &dev->dev;
+       ret = gpiochip_add (&gpio_apu2_chip);
+       if (ret) {
+               pr_err ("%s: adding gpiochip failed\n", DEVNAME);
+       }
+
+       return ret;
+ }
+
+ static int gpio_apu2_remove (struct platform_device *dev)
+ {
+ #if LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0)
+       int ret;
+       ret = gpiochip_remove (&gpio_apu2_chip);
+ #else /* LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0) */
+       gpiochip_remove (&gpio_apu2_chip);
+ #endif /* LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0) */
+       return 0;
+ }
+
+ static struct platform_driver gpio_apu2_driver = {
+       .probe = gpio_apu2_probe,
+       .remove = gpio_apu2_remove,
+       .driver = {
+               .owner = THIS_MODULE,
+               .name = DEVNAME
+       }
+ };
+
+ static struct gpio_led apu2_leds_gpio[] = {
+         {
+                 .name           = "apu2:green:power",
+                 .gpio           = 509,
+                 .active_low     = 1,
+         },
+         {
+                 .name           = "apu2:green:led2",
+                 .gpio           = 510,
+                 .active_low     = 1,
+         },
+         {
+                 .name           = "apu2:green:led3",
+                 .gpio           = 511,
+                 .active_low     = 1,
+         },
+ };
+
+ static struct gpio_keys_button apu2_gpio_keys[] = {
+       {
+               .desc           = "Reset button",
+               .type           = EV_KEY,
+               .code           = KEY_RESTART,
+               .debounce_interval = 60,
+               .gpio           = 508,
+               .active_low     = 1,
+       },
+ };
+
+ static void register_gpio_keys_polled(int id, unsigned poll_interval,
+                                     unsigned nbuttons,
+                                     struct gpio_keys_button *buttons)
+ {
+       struct gpio_keys_platform_data pdata = { };
+       int err;
+
+       keydev = platform_device_alloc("gpio-keys-polled", id);
+       if (!keydev) {
+               printk(KERN_ERR "Failed to allocate gpio-keys platform 
device\n");
+               return;
+       }
+
+       pdata.poll_interval = poll_interval;
+       pdata.nbuttons = nbuttons;
+       pdata.buttons = buttons;
+
+       err = platform_device_add_data(keydev, &pdata, sizeof(pdata));
+       if (err) {
+               dev_err(&keydev->dev, "failed to add platform data to key 
driver (%d)", err);
+               goto err_put_pdev;
+       }
+
+       err = platform_device_add(keydev);
+       if (err) {
+               dev_err(&keydev->dev, "failed to register key platform device 
(%d)", err);
+               goto err_put_pdev;
+       }
+
+       return;
+
+ err_put_pdev:
+       platform_device_put(keydev);
+       keydev = NULL;
+ }
+
+ static void register_leds_gpio(int id, unsigned num_leds, struct gpio_led 
*leds)
+ {
+       struct gpio_led_platform_data pdata = { };
+       int err;
+
+       leddev = platform_device_alloc("leds-gpio", id);
+       if (!leddev) {
+               printk(KERN_ERR "Failed to allocate leds-gpio platform 
device\n");
+               return;
+       }
+
+       pdata.num_leds = num_leds;
+       pdata.leds = leds;
+
+       err = platform_device_add_data(leddev, &pdata, sizeof(pdata));
+       if (err) {
+               dev_err(&leddev->dev, "failed to add platform data to key 
driver (%d)", err);
+               goto err_put_pdev;
+       }
+
+       err = platform_device_add(leddev);
+       if (err) {
+               dev_err(&leddev->dev, "failed to register key platform device 
(%d)", err);
+               goto err_put_pdev;
+       }
+
+       return;
+
+ err_put_pdev:
+       platform_device_put(leddev);
+       leddev = NULL;
+ }
+
+ static int __init gpio_apu2_init (void)
+ {
+       int err;
+       const char *board_vendor = dmi_get_system_info(DMI_BOARD_VENDOR);
+       const char *board_name = dmi_get_system_info(DMI_BOARD_NAME);
+
+       /* Match the device name/model */
+       if (!board_name || !board_vendor || strcasecmp(board_vendor, "PC 
Engines") || strcasecmp(board_name, "apu2")) {
+               err = -ENODEV;
+               goto exit;
+       }
+
+       pr_info ("%s: load APU2/LED GPIO driver module\n", DEVNAME);
+
+       err = platform_driver_register (&gpio_apu2_driver);
+       if (err)
+               goto exit;
+
+       gpio_apu2_platform_device = platform_device_register_simple (DEVNAME, 
-1, NULL, 0);
+       if (IS_ERR(gpio_apu2_platform_device)) {
+               err = PTR_ERR(gpio_apu2_platform_device);
+               goto exit_driver;
+       }
+
+       pr_info ("%s: APU2 GPIO/LED driver module loaded\n", DEVNAME);
+
+       register_leds_gpio(-1, ARRAY_SIZE(apu2_leds_gpio), apu2_leds_gpio);
+       register_gpio_keys_polled(-1, 20, ARRAY_SIZE(apu2_gpio_keys), 
apu2_gpio_keys);
+       return 0;
+
+ exit_driver:
+       platform_driver_unregister (&gpio_apu2_driver);
+ exit:
+       return err;
+ }
+
+ static void __exit gpio_apu2_exit (void)
+ {
+       platform_device_unregister (gpio_apu2_platform_device);
+       platform_device_unregister (leddev);
+       platform_device_unregister (keydev);
+       platform_driver_unregister (&gpio_apu2_driver);
+       pr_info ("%s: APU2 GPIO/LED driver module unloaded\n", DEVNAME);
+ }
+
+ MODULE_AUTHOR ("Carsten Spiess <fli4l at carsten-spiess.de>");
+ MODULE_DESCRIPTION("GPIO driver for AMD FCH on PC-Engines APU-2");
+ MODULE_LICENSE("GPL");
+
+ module_init (gpio_apu2_init);
+ module_exit (gpio_apu2_exit);
-- 
2.7.4


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