leds-apu2: Add PC Engines APU2 LED driver
This adds support for the PCB LEDs and Reset Button found on the PC Engines APU2/APU3 embedded boards. Signed-off-by: Chris Blake <chrisrblake93@gmail.com>
This commit is contained in:
Chris Blake
Jo-Philipp Wich
parent
65b05463d7
commit
9451cd7c5b
52
package/kernel/leds-apu2/Makefile
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52
package/kernel/leds-apu2/Makefile
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@ -0,0 +1,52 @@
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#
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# Copyright (C) 2017 Chris Blake <chrisrblake93@gmail.com>
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#
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# This is free software, licensed under the GNU General Public License v2.
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# See /LICENSE for more information.
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#
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include $(TOPDIR)/rules.mk
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include $(INCLUDE_DIR)/kernel.mk
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PKG_NAME:=leds-apu2
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PKG_RELEASE:=1
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PKG_MAINTAINER:=Chris Blake <chrisrblake93@gmail.com>
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PKG_LICENSE:=GPL-2.0
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include $(INCLUDE_DIR)/package.mk
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define KernelPackage/leds-apu2
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SUBMENU:=LED modules
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TITLE:= PC Engines APU2/APU3 LED support
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DEPENDS:= @GPIO_SUPPORT @TARGET_x86
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FILES:=$(PKG_BUILD_DIR)/leds-apu2.ko
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AUTOLOAD:=$(call AutoLoad,41,leds-apu2,1)
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KCONFIG:=
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endef
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define KernelPackage/leds-apu2/description
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Driver for the PC Engines APU2/APU3 LEDs & Reset Button.
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endef
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EXTRA_KCONFIG:= \
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CONFIG_LEDS_APU2=m
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EXTRA_CFLAGS:= \
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$(patsubst CONFIG_%, -DCONFIG_%=1, $(patsubst %=m,%,$(filter %=m,$(EXTRA_KCONFIG)))) \
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$(patsubst CONFIG_%, -DCONFIG_%=1, $(patsubst %=y,%,$(filter %=y,$(EXTRA_KCONFIG)))) \
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MAKE_OPTS:= \
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ARCH="$(LINUX_KARCH)" \
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CROSS_COMPILE="$(TARGET_CROSS)" \
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SUBDIRS="$(PKG_BUILD_DIR)" \
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EXTRA_CFLAGS="$(EXTRA_CFLAGS)" \
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$(EXTRA_KCONFIG)
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define Build/Compile
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$(MAKE) -C "$(LINUX_DIR)" \
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$(MAKE_OPTS) \
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modules
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endef
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$(eval $(call KernelPackage,leds-apu2))
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8
package/kernel/leds-apu2/src/Kconfig
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8
package/kernel/leds-apu2/src/Kconfig
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config LEDS_APU2
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tristate "PC Engines APU2/APU3 LED support"
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depends on LEDS_CLASS
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depends on LEDS_GPIO
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depends on GPIOLIB
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help
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Say yes here to enable support for the CPU GPIO pins on the PC Engines
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APU2/APU3 board, which enables the front LEDs and Reset Button.
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1
package/kernel/leds-apu2/src/Makefile
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1
package/kernel/leds-apu2/src/Makefile
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obj-${CONFIG_LEDS_APU2} += leds-apu2.o
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374
package/kernel/leds-apu2/src/leds-apu2.c
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package/kernel/leds-apu2/src/leds-apu2.c
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/*
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* APU2 LED/GPIO Driver
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* Copyright (c) 2016 Christian Lamparter <chunkeey (at) googlemail.com>
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*
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* Based on gpio-apu2.c - AMD FCH GPIO support for PC-Engines APU-2 board
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*
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* Copyright (c) 2015 Carsten Spiess <fli4l at carsten-spiess.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/miscdevice.h>
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#include <linux/gpio.h>
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/ioport.h>
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#include <linux/platform_device.h>
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#include <linux/uaccess.h>
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#include <linux/io.h>
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#include <linux/version.h>
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#include <linux/dmi.h>
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#include <linux/string.h>
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#include <linux/leds.h>
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#include <linux/input.h>
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#include <linux/gpio_keys.h>
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#define DEVNAME "leds-apu2"
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#define FCH_ACPI_MMIO_BASE 0xFED80000
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#define FCH_GPIO_BASE (FCH_ACPI_MMIO_BASE + 0x1500)
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#define FCH_GPIO_SIZE 0x300
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#define APU_NUM_GPIO 4
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#define GPIO_BIT_DIR 23
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#define GPIO_BIT_WRITE 22
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#define GPIO_BIT_READ 16
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/* internal variables */
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static struct pci_dev *gpio_apu2_pci;
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static DEFINE_SPINLOCK (gpio_lock);
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/* the watchdog platform device */
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static struct platform_device *gpio_apu2_platform_device;
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static struct platform_device *leddev;
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static struct platform_device *keydev;
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static const struct pci_device_id gpio_apu2_pci_tbl[] ={
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{PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_HUDSON2_SMBUS, PCI_ANY_ID, PCI_ANY_ID},
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{ 0, } /* End of list */
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};
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MODULE_DEVICE_TABLE (pci, gpio_apu2_pci_tbl);
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/* EGPIO89=GPIO32, AGPIO68=GPIO57, AGPIO69=GPIO58, AGPIO70=GPIO59 */
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static u8 gpio_offset[APU_NUM_GPIO] = {89, 68, 69, 70};
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static void __iomem *gpio_addr[APU_NUM_GPIO] = {NULL, NULL, NULL, NULL};
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static int gpio_apu2_get_dir (struct gpio_chip *chip, unsigned offset)
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{
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u32 val;
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val = ~ioread32 (gpio_addr[offset]);
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return (val >> GPIO_BIT_DIR) & 1;
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}
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static int gpio_apu2_dir_in (struct gpio_chip *gc, unsigned offset)
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{
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u32 val;
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spin_lock_bh (&gpio_lock);
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val = ioread32 (gpio_addr[offset]);
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val &= ~BIT(GPIO_BIT_DIR);
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iowrite32 (val, gpio_addr[offset]);
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spin_unlock_bh (&gpio_lock);
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return 0;
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}
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static int gpio_apu2_dir_out (struct gpio_chip *chip, unsigned offset,
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int value)
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{
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u32 val;
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spin_lock_bh (&gpio_lock);
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val = ioread32 (gpio_addr[offset]);
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val |= BIT(GPIO_BIT_DIR);
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iowrite32 (val, gpio_addr[offset]);
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spin_unlock_bh (&gpio_lock);
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return 0;
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}
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static int gpio_apu2_get_data (struct gpio_chip *chip, unsigned offset)
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{
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u32 val;
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val = ioread32 (gpio_addr[offset]);
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return (val >> GPIO_BIT_READ) & 1;
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}
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static void gpio_apu2_set_data (struct gpio_chip *chip, unsigned offset, int value)
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{
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u32 val;
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spin_lock_bh (&gpio_lock);
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val = ioread32 (gpio_addr[offset]);
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if (value)
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val |= BIT(GPIO_BIT_WRITE);
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else
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val &= ~BIT(GPIO_BIT_WRITE);
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iowrite32 (val, gpio_addr[offset]);
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spin_unlock_bh (&gpio_lock);
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}
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static struct gpio_chip gpio_apu2_chip = {
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.label = DEVNAME,
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.owner = THIS_MODULE,
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.base = -1,
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.ngpio = APU_NUM_GPIO,
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.get_direction = gpio_apu2_get_dir,
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.direction_input = gpio_apu2_dir_in,
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.direction_output = gpio_apu2_dir_out,
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.get = gpio_apu2_get_data,
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.set = gpio_apu2_set_data,
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};
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/*
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*
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*/
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static int gpio_apu2_probe (struct platform_device *dev)
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{
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int ret = 0;
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int i;
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struct pci_dev *pci_dev = NULL;
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/* Match the PCI device */
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for_each_pci_dev (pci_dev) {
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if (pci_match_id (gpio_apu2_pci_tbl, pci_dev) != NULL) {
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gpio_apu2_pci = pci_dev;
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break;
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}
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}
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if (!gpio_apu2_pci)
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return -ENODEV;
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pr_info ("%s: PCI Revision ID: 0x%x\n", DEVNAME, gpio_apu2_pci->revision);
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/* Determine type of southbridge chipset */
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if (gpio_apu2_pci->revision < 0x40) {
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return -EACCES;
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}
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/* Request memory region for GPIO's */
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if (!devm_request_mem_region (&dev->dev, FCH_GPIO_BASE,
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FCH_GPIO_SIZE, DEVNAME)){
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pr_err ("%s: request GPIO mem region failed\n", DEVNAME);
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return -ENXIO;
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}
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/* Map IO's for GPIO's */
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for (i = 0; i < APU_NUM_GPIO; i++) {
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gpio_addr[i] = devm_ioremap (&dev->dev,
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FCH_GPIO_BASE + (gpio_offset[i] * sizeof (u32)), sizeof (u32));
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if (!gpio_addr[i]) {
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pr_err ("%s: map GPIO%d address failed\n", DEVNAME, gpio_offset[i]);
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return -ENXIO;
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}
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}
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gpio_apu2_chip.dev = &dev->dev;
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ret = gpiochip_add (&gpio_apu2_chip);
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if (ret) {
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pr_err ("%s: adding gpiochip failed\n", DEVNAME);
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}
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return ret;
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}
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static int gpio_apu2_remove (struct platform_device *dev)
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{
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#if LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0)
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int ret;
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ret = gpiochip_remove (&gpio_apu2_chip);
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#else /* LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0) */
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gpiochip_remove (&gpio_apu2_chip);
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#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0) */
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return 0;
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}
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static struct platform_driver gpio_apu2_driver = {
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.probe = gpio_apu2_probe,
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.remove = gpio_apu2_remove,
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.driver = {
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.owner = THIS_MODULE,
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.name = DEVNAME
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}
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};
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static struct gpio_led apu2_leds_gpio[] = {
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{
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.name = "apu2:green:power",
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.gpio = 509,
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.active_low = 1,
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},
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{
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.name = "apu2:green:led2",
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.gpio = 510,
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.active_low = 1,
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},
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{
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.name = "apu2:green:led3",
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.gpio = 511,
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.active_low = 1,
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},
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};
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static struct gpio_keys_button apu2_gpio_keys[] = {
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{
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.desc = "Reset button",
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.type = EV_KEY,
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.code = KEY_RESTART,
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.debounce_interval = 60,
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.gpio = 508,
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.active_low = 1,
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},
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};
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static void register_gpio_keys_polled(int id, unsigned poll_interval,
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unsigned nbuttons,
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struct gpio_keys_button *buttons)
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{
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struct gpio_keys_platform_data pdata = { };
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int err;
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keydev = platform_device_alloc("gpio-keys-polled", id);
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if (!keydev) {
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printk(KERN_ERR "Failed to allocate gpio-keys platform device\n");
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return;
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}
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pdata.poll_interval = poll_interval;
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pdata.nbuttons = nbuttons;
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pdata.buttons = buttons;
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err = platform_device_add_data(keydev, &pdata, sizeof(pdata));
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if (err) {
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dev_err(&keydev->dev, "failed to add platform data to key driver (%d)", err);
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goto err_put_pdev;
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}
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err = platform_device_add(keydev);
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if (err) {
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dev_err(&keydev->dev, "failed to register key platform device (%d)", err);
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goto err_put_pdev;
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}
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return;
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err_put_pdev:
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platform_device_put(keydev);
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keydev = NULL;
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}
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static void register_leds_gpio(int id, unsigned num_leds, struct gpio_led *leds)
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{
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struct gpio_led_platform_data pdata = { };
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int err;
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leddev = platform_device_alloc("leds-gpio", id);
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if (!leddev) {
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printk(KERN_ERR "Failed to allocate leds-gpio platform device\n");
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return;
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}
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pdata.num_leds = num_leds;
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pdata.leds = leds;
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err = platform_device_add_data(leddev, &pdata, sizeof(pdata));
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if (err) {
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dev_err(&leddev->dev, "failed to add platform data to key driver (%d)", err);
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goto err_put_pdev;
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}
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err = platform_device_add(leddev);
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if (err) {
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dev_err(&leddev->dev, "failed to register key platform device (%d)", err);
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goto err_put_pdev;
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}
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return;
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err_put_pdev:
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platform_device_put(leddev);
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leddev = NULL;
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}
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static int __init gpio_apu2_init (void)
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{
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int err;
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const char *board_vendor = dmi_get_system_info(DMI_BOARD_VENDOR);
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const char *board_name = dmi_get_system_info(DMI_BOARD_NAME);
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/* Match the device name/model */
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if (!board_name || !board_vendor || strcasecmp(board_vendor, "PC Engines") || strcasecmp(board_name, "apu2")) {
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err = -ENODEV;
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goto exit;
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}
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pr_info ("%s: load APU2/LED GPIO driver module\n", DEVNAME);
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err = platform_driver_register (&gpio_apu2_driver);
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if (err)
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goto exit;
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gpio_apu2_platform_device = platform_device_register_simple (DEVNAME, -1, NULL, 0);
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if (IS_ERR(gpio_apu2_platform_device)) {
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err = PTR_ERR(gpio_apu2_platform_device);
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goto exit_driver;
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}
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pr_info ("%s: APU2 GPIO/LED driver module loaded\n", DEVNAME);
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register_leds_gpio(-1, ARRAY_SIZE(apu2_leds_gpio), apu2_leds_gpio);
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register_gpio_keys_polled(-1, 20, ARRAY_SIZE(apu2_gpio_keys), apu2_gpio_keys);
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return 0;
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exit_driver:
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platform_driver_unregister (&gpio_apu2_driver);
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exit:
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return err;
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}
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static void __exit gpio_apu2_exit (void)
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{
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platform_device_unregister (gpio_apu2_platform_device);
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platform_device_unregister (leddev);
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platform_device_unregister (keydev);
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platform_driver_unregister (&gpio_apu2_driver);
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pr_info ("%s: APU2 GPIO/LED driver module unloaded\n", DEVNAME);
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}
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MODULE_AUTHOR ("Carsten Spiess <fli4l at carsten-spiess.de>");
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MODULE_DESCRIPTION("GPIO driver for AMD FCH on PC-Engines APU-2");
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MODULE_LICENSE("GPL");
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module_init (gpio_apu2_init);
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module_exit (gpio_apu2_exit);
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