platform/x86: add support for Advantech software defined button

Advantech sw_button is a ACPI event trigger button.

With this driver, we can report KEY_PROG1 on the
Advantech Tabletop Network Appliances products and it has been
tested in FWA1112VC.

Add the software define button support to report EV_REP key_event
(KEY_PROG1) by pressing button that could be get on user
interface and trigger the customized actions.

Signed-off-by: Andrea.Ho <Andrea.Ho@advantech.com.tw>
Link: https://lore.kernel.org/r/20210319034427.23222-1-andrea.cs97g@nctu.edu.tw
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

diff --git a/MAINTAINERS b/MAINTAINERS
index 3ff47a6..707c902 100644 (file)
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -573,6 +573,12 @@ S: Maintained
 F:     Documentation/scsi/advansys.rst
 F:     drivers/scsi/advansys.c
 
+ADVANTECH SWBTN DRIVER
+M:     Andrea Ho <Andrea.Ho@advantech.com.tw>
+L:     platform-driver-x86@vger.kernel.org
+S:     Maintained
+F:     drivers/platform/x86/adv_swbutton.c
+
 ADXL34X THREE-AXIS DIGITAL ACCELEROMETER DRIVER (ADXL345/ADXL346)
 M:     Michael Hennerich <michael.hennerich@analog.com>
 S:     Supported

diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index dcc01dd..53973ee 100644 (file)
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -193,6 +193,17 @@ config AMD_PMC
          If you choose to compile this driver as a module the module will be
          called amd-pmc.
 
+config ADV_SWBUTTON
+       tristate "Advantech ACPI Software Button Driver"
+       depends on ACPI && INPUT
+       help
+         Say Y here to enable support for Advantech software defined
+         button feature. More information can be found at
+         <http://www.advantech.com.tw/products/>
+
+         To compile this driver as a module, choose M here. The module will
+         be called adv_swbutton.
+
 config APPLE_GMUX
        tristate "Apple Gmux Driver"
        depends on ACPI && PCI

diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index 60d5540..3e36494 100644 (file)
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -24,6 +24,9 @@ obj-$(CONFIG_ACER_WMI)                += acer-wmi.o
 # AMD
 obj-$(CONFIG_AMD_PMC)          += amd-pmc.o
 
+# Advantech
+obj-$(CONFIG_ADV_SWBUTTON)     += adv_swbutton.o
+
 # Apple
 obj-$(CONFIG_APPLE_GMUX)       += apple-gmux.o
 

diff --git a/drivers/platform/x86/adv_swbutton.c b/drivers/platform/x86/adv_swbutton.c
new file mode 100644 (file)
index 0000000..38693b7
--- /dev/null
+++ b/drivers/platform/x86/adv_swbutton.c
@@ -0,0 +1,121 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  adv_swbutton.c - Software Button Interface Driver.
+ *
+ *  (C) Copyright 2020 Advantech Corporation, Inc
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/input.h>
+#include <linux/acpi.h>
+#include <linux/platform_device.h>
+
+#define ACPI_BUTTON_HID_SWBTN               "AHC0310"
+
+#define ACPI_BUTTON_NOTIFY_SWBTN_RELEASE    0x86
+#define ACPI_BUTTON_NOTIFY_SWBTN_PRESSED    0x85
+
+struct adv_swbutton {
+       struct input_dev *input;
+       char phys[32];
+};
+
+/*-------------------------------------------------------------------------
+ *                               Driver Interface
+ *--------------------------------------------------------------------------
+ */
+static void adv_swbutton_notify(acpi_handle handle, u32 event, void *context)
+{
+       struct platform_device *device = context;
+       struct adv_swbutton *button = dev_get_drvdata(&device->dev);
+
+       switch (event) {
+       case ACPI_BUTTON_NOTIFY_SWBTN_RELEASE:
+               input_report_key(button->input, KEY_PROG1, 0);
+               input_sync(button->input);
+               break;
+       case ACPI_BUTTON_NOTIFY_SWBTN_PRESSED:
+               input_report_key(button->input, KEY_PROG1, 1);
+               input_sync(button->input);
+               break;
+       default:
+               dev_dbg(&device->dev, "Unsupported event [0x%x]\n", event);
+       }
+}
+
+static int adv_swbutton_probe(struct platform_device *device)
+{
+       struct adv_swbutton *button;
+       struct input_dev *input;
+       acpi_handle handle = ACPI_HANDLE(&device->dev);
+       acpi_status status;
+       int error;
+
+       button = devm_kzalloc(&device->dev, sizeof(*button), GFP_KERNEL);
+       if (!button)
+               return -ENOMEM;
+
+       dev_set_drvdata(&device->dev, button);
+
+       input = devm_input_allocate_device(&device->dev);
+       if (!input)
+               return -ENOMEM;
+
+       button->input = input;
+       snprintf(button->phys, sizeof(button->phys), "%s/button/input0", ACPI_BUTTON_HID_SWBTN);
+
+       input->name = "Advantech Software Button";
+       input->phys = button->phys;
+       input->id.bustype = BUS_HOST;
+       input->dev.parent = &device->dev;
+       set_bit(EV_REP, input->evbit);
+       input_set_capability(input, EV_KEY, KEY_PROG1);
+
+       error = input_register_device(input);
+       if (error)
+               return error;
+
+       device_init_wakeup(&device->dev, true);
+
+       status = acpi_install_notify_handler(handle,
+                                            ACPI_DEVICE_NOTIFY,
+                                            adv_swbutton_notify,
+                                            device);
+       if (ACPI_FAILURE(status)) {
+               dev_err(&device->dev, "Error installing notify handler\n");
+               return -EIO;
+       }
+
+       return 0;
+}
+
+static int adv_swbutton_remove(struct platform_device *device)
+{
+       acpi_handle handle = ACPI_HANDLE(&device->dev);
+
+       acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY,
+                                  adv_swbutton_notify);
+
+       return 0;
+}
+
+static const struct acpi_device_id button_device_ids[] = {
+       {ACPI_BUTTON_HID_SWBTN, 0},
+       {"", 0},
+};
+MODULE_DEVICE_TABLE(acpi, button_device_ids);
+
+static struct platform_driver adv_swbutton_driver = {
+       .driver = {
+               .name = "adv_swbutton",
+               .acpi_match_table = button_device_ids,
+       },
+       .probe = adv_swbutton_probe,
+       .remove = adv_swbutton_remove,
+};
+module_platform_driver(adv_swbutton_driver);
+
+MODULE_AUTHOR("Andrea Ho");
+MODULE_DESCRIPTION("Advantech ACPI SW Button Driver");
+MODULE_LICENSE("GPL v2");