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Subject[PATCH v4 2/2] platform: Add reset button device for PC Engines APU boards
Date
Add a platform/x86 device "gpio-keys-polled" for the frontpanel reset button.
This device uses the gpio-apu driver for APU borads from PC Engines.

Signed-off-by: Florian Eckert <fe@dev.tdt.de>
---
drivers/platform/x86/Kconfig | 11 +++
drivers/platform/x86/Makefile | 1 +
drivers/platform/x86/pcengines-apu-platform.c | 114 ++++++++++++++++++++++++++
3 files changed, 126 insertions(+)
create mode 100644 drivers/platform/x86/pcengines-apu-platform.c

diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 54f6a40c75c6..5cd27c2174cb 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -1288,6 +1288,17 @@ config INTEL_ATOMISP2_PM
To compile this driver as a module, choose M here: the module
will be called intel_atomisp2_pm.

+config PCENGINES_APU_PLATFORM
+ bool "PCEngines APU System Support"
+ depends on X86_64 && DMI && GPIOLIB
+ help
+ This option enables system support for the PCEngines APU platform.
+ At present this just adds the GPIO reset button platform device on
+ APU2/APU3 boards.
+
+ Note: You must still enable the drivers for GPIO and LED support
+ (GPIO_APU & LEDS_APU) to actually use the LEDs and the GPIOs.
+
endif # X86_PLATFORM_DEVICES

config PMC_ATOM
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index 39ae94135406..f899cc4c6b48 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -96,3 +96,4 @@ obj-$(CONFIG_INTEL_TURBO_MAX_3) += intel_turbo_max_3.o
obj-$(CONFIG_INTEL_CHTDC_TI_PWRBTN) += intel_chtdc_ti_pwrbtn.o
obj-$(CONFIG_I2C_MULTI_INSTANTIATE) += i2c-multi-instantiate.o
obj-$(CONFIG_INTEL_ATOMISP2_PM) += intel_atomisp2_pm.o
+obj-$(CONFIG_PCENGINES_APU_PLATFORM) += pcengines-apu-platform.o
diff --git a/drivers/platform/x86/pcengines-apu-platform.c b/drivers/platform/x86/pcengines-apu-platform.c
new file mode 100644
index 000000000000..3bfbaa93cb11
--- /dev/null
+++ b/drivers/platform/x86/pcengines-apu-platform.c
@@ -0,0 +1,114 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * System Specific setup for PC-Engines APU2/APU3 devices
+ *
+ * Copyright (C) 2018 Florian Eckert <fe@dev.tdt.de>
+ */
+
+#include <linux/dmi.h>
+#include <linux/gpio_keys.h>
+#include <linux/input.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+static const struct dmi_system_id apu2_gpio_dmi_table[] __initconst = {
+ /* PC Engines APU2 with "Legacy" bios < 4.0.8 */
+ {
+ .ident = "apu2",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
+ DMI_MATCH(DMI_BOARD_NAME, "APU2")
+ }
+ },
+ /* PC Engines APU2 with "Legacy" bios >= 4.0.8 */
+ {
+ .ident = "apu2",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
+ DMI_MATCH(DMI_BOARD_NAME, "apu2")
+ }
+ },
+ /* PC Engines APU2 with "Mainline" bios */
+ {
+ .ident = "apu2",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
+ DMI_MATCH(DMI_BOARD_NAME, "PC Engines apu2")
+ }
+ },
+ {}
+};
+MODULE_DEVICE_TABLE(dmi, apu2_gpio_dmi_table);
+
+static const struct dmi_system_id apu3_gpio_dmi_table[] __initconst = {
+ /* PC Engines APU3 with "Legacy" bios < 4.0.8 */
+ {
+ .ident = "apu3",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
+ DMI_MATCH(DMI_BOARD_NAME, "APU3")
+ }
+ },
+ /* PC Engines APU3 with "Legacy" bios >= 4.0.8 */
+ {
+ .ident = "apu3",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
+ DMI_MATCH(DMI_BOARD_NAME, "apu3")
+ }
+ },
+ /* PC Engines APU3 with "Mainline" bios */
+ {
+ .ident = "apu3",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
+ DMI_MATCH(DMI_BOARD_NAME, "PC Engines apu3")
+ }
+ },
+ {}
+};
+MODULE_DEVICE_TABLE(dmi, apu3_gpio_dmi_table);
+
+
+static struct gpio_keys_button apu_gpio_buttons[] = {
+ {
+ .code = KEY_RESTART,
+ .gpio = 20,
+ .active_low = 1,
+ .desc = "Reset button",
+ .type = EV_KEY,
+ .debounce_interval = 60,
+ }
+};
+
+static struct gpio_keys_platform_data apu_buttons_data = {
+ .buttons = apu_gpio_buttons,
+ .nbuttons = ARRAY_SIZE(apu_gpio_buttons),
+ .poll_interval = 20,
+};
+
+static struct platform_device apu_button_dev = {
+ .name = "gpio-keys-polled",
+ .id = 1,
+ .dev = {
+ .platform_data = &apu_buttons_data,
+ }
+};
+
+static int __init apu_init(void)
+{
+ if (!(dmi_check_system(apu2_gpio_dmi_table)) &&
+ !(dmi_check_system(apu3_gpio_dmi_table))) {
+ return -ENODEV;
+ }
+
+ return platform_device_register(&apu_button_dev);
+}
+
+static void __exit apu_exit(void)
+{
+ platform_device_unregister(&apu_button_dev);
+}
+
+module_init(apu_init);
+module_exit(apu_exit);
--
2.11.0
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