platform/x86: Add custom surface3 platform device for controlling LID
authorBenjamin Tissoires <benjamin.tissoires@redhat.com>
Fri, 25 Nov 2016 16:11:41 +0000 (17:11 +0100)
committerAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Fri, 16 Dec 2016 21:30:25 +0000 (23:30 +0200)
The LID state provided by ACPI on the Surface 3 is not accurate.
The ACPI node doesn't get notified on LID open, which means the
LID input switch stays close most of the time.

Fortunatelly, there is a WMI method which directly queries the
GPIO underneath the LID state, so it's far more reliable than ACPI.
To get the notifications that the LID was opened/closed, we can
rely on the ACPI notification of the touchscreen: the DSDT shows
that the touchscreen will get notified on close/open as it also
controls its _STA method.

Note that we need to set the tag "power-switch" to the LID
input node through a udev rule for logind to accept it:

SUBSYSTEM=="input", KERNEL=="event*", KERNELS=="surface3-wmi", \
TAG+="power-switch"

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
drivers/platform/x86/Kconfig
drivers/platform/x86/Makefile
drivers/platform/x86/surface3-wmi.c [new file with mode: 0644]

index 4639d970f8cb867c87a3d5cca58aa80ae85cc873..0414d76dc15cd3a32add4f305b7916df0c986528 100644 (file)
@@ -363,6 +363,18 @@ config IDEAPAD_LAPTOP
          This is a driver for Lenovo IdeaPad netbooks contains drivers for
          rfkill switch, hotkey, fan control and backlight control.
 
+config SURFACE3_WMI
+       tristate "Surface 3 WMI Driver"
+       depends on ACPI_WMI
+       depends on DMI
+       depends on INPUT
+       depends on SPI
+       ---help---
+         Say Y here if you have a Surface 3.
+
+         To compile this driver as a module, choose M here: the module will
+         be called surface3-wmi.
+
 config THINKPAD_ACPI
        tristate "ThinkPad ACPI Laptop Extras"
        depends on ACPI
index 2d6a587bded5d4f0c74a7a5d542c49d7c17400df..6cd3d909b7591f75305935fa7cbf4bead96d9387 100644 (file)
@@ -34,6 +34,7 @@ obj-$(CONFIG_PANASONIC_LAPTOP)        += panasonic-laptop.o
 obj-$(CONFIG_INTEL_MENLOW)     += intel_menlow.o
 obj-$(CONFIG_ACPI_WMI)         += wmi.o
 obj-$(CONFIG_MSI_WMI)          += msi-wmi.o
+obj-$(CONFIG_SURFACE3_WMI)     += surface3-wmi.o
 obj-$(CONFIG_TOPSTAR_LAPTOP)   += topstar-laptop.o
 
 # toshiba_acpi must link after wmi to ensure that wmi devices are found
diff --git a/drivers/platform/x86/surface3-wmi.c b/drivers/platform/x86/surface3-wmi.c
new file mode 100644 (file)
index 0000000..5553b2b
--- /dev/null
@@ -0,0 +1,296 @@
+/*
+ *  Driver for the LID cover switch of the Surface 3
+ *
+ *  Copyright (c) 2016 Red Hat Inc.
+ */
+
+/*
+ * 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; version 2 of the License.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+
+#include <linux/acpi.h>
+#include <linux/dmi.h>
+#include <linux/input.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+#include <linux/spi/spi.h>
+
+MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@redhat.com>");
+MODULE_DESCRIPTION("Surface 3 platform driver");
+MODULE_LICENSE("GPL");
+
+#define ACPI_BUTTON_HID_LID            "PNP0C0D"
+#define SPI_CTL_OBJ_NAME               "SPI"
+#define SPI_TS_OBJ_NAME                        "NTRG"
+
+#define SURFACE3_LID_GUID "F7CC25EC-D20B-404C-8903-0ED4359C18AE"
+
+MODULE_ALIAS("wmi:" SURFACE3_LID_GUID);
+
+static const struct dmi_system_id surface3_dmi_table[] = {
+#if defined(CONFIG_X86)
+       {
+               .matches = {
+                       DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
+                       DMI_MATCH(DMI_PRODUCT_NAME, "Surface 3"),
+               },
+       },
+#endif
+       { }
+};
+
+struct surface3_wmi {
+       struct acpi_device *touchscreen_adev;
+       struct acpi_device *pnp0c0d_adev;
+       struct acpi_hotplug_context hp;
+       struct input_dev *input;
+};
+
+static struct platform_device *s3_wmi_pdev;
+
+static struct surface3_wmi s3_wmi;
+
+static DEFINE_MUTEX(s3_wmi_lock);
+
+static int s3_wmi_query_block(const char *guid, int instance, int *ret)
+{
+       acpi_status status;
+       union acpi_object *obj;
+
+       struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
+
+       mutex_lock(&s3_wmi_lock);
+       status = wmi_query_block(guid, instance, &output);
+
+       obj = output.pointer;
+
+       if (!obj || obj->type != ACPI_TYPE_INTEGER) {
+               if (obj) {
+                       pr_err("query block returned object type: %d - buffer length:%d\n",
+                              obj->type,
+                              obj->type == ACPI_TYPE_BUFFER ?
+                                               obj->buffer.length : 0);
+               }
+               kfree(obj);
+               return -EINVAL;
+       }
+       *ret = obj->integer.value;
+       kfree(obj);
+       mutex_unlock(&s3_wmi_lock);
+       return 0;
+}
+
+static inline int s3_wmi_query_lid(int *ret)
+{
+       return s3_wmi_query_block(SURFACE3_LID_GUID, 0, ret);
+}
+
+static int s3_wmi_send_lid_state(void)
+{
+       int ret, lid_sw;
+
+       ret = s3_wmi_query_lid(&lid_sw);
+       if (ret)
+               return ret;
+
+       input_report_switch(s3_wmi.input, SW_LID, lid_sw);
+       input_sync(s3_wmi.input);
+
+       return 0;
+}
+
+static int s3_wmi_hp_notify(struct acpi_device *adev, u32 value)
+{
+       return s3_wmi_send_lid_state();
+}
+
+static acpi_status s3_wmi_attach_spi_device(acpi_handle handle,
+                                           u32 level,
+                                           void *data,
+                                           void **return_value)
+{
+       struct acpi_device *adev, **ts_adev;
+
+       if (acpi_bus_get_device(handle, &adev))
+               return AE_OK;
+
+       ts_adev = data;
+
+       if (strncmp(acpi_device_bid(adev), SPI_TS_OBJ_NAME,
+           strlen(SPI_TS_OBJ_NAME)))
+               return AE_OK;
+
+       if (*ts_adev) {
+               pr_err("duplicate entry %s\n", SPI_TS_OBJ_NAME);
+               return AE_OK;
+       }
+
+       *ts_adev = adev;
+
+       return AE_OK;
+}
+
+static int s3_wmi_check_platform_device(struct device *dev, void *data)
+{
+       struct acpi_device *adev, *ts_adev;
+       acpi_handle handle;
+       acpi_status status;
+
+       /* ignore non ACPI devices */
+       handle = ACPI_HANDLE(dev);
+       if (!handle || acpi_bus_get_device(handle, &adev))
+               return 0;
+
+       /* check for LID ACPI switch */
+       if (!strcmp(ACPI_BUTTON_HID_LID, acpi_device_hid(adev))) {
+               s3_wmi.pnp0c0d_adev = adev;
+               return 0;
+       }
+
+       /* ignore non SPI controllers */
+       if (strncmp(acpi_device_bid(adev), SPI_CTL_OBJ_NAME,
+           strlen(SPI_CTL_OBJ_NAME)))
+               return 0;
+
+       status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
+                                    s3_wmi_attach_spi_device, NULL,
+                                    &ts_adev, NULL);
+       if (ACPI_FAILURE(status))
+               dev_warn(dev, "failed to enumerate SPI slaves\n");
+
+       if (!ts_adev)
+               return 0;
+
+       s3_wmi.touchscreen_adev = ts_adev;
+
+       return 0;
+}
+
+static int s3_wmi_create_and_register_input(struct platform_device *pdev)
+{
+       struct input_dev *input;
+       int error;
+
+       input = devm_input_allocate_device(&pdev->dev);
+       if (!input)
+               return -ENOMEM;
+
+       input->name = "Lid Switch";
+       input->phys = "button/input0";
+       input->id.bustype = BUS_HOST;
+       input->id.product = 0x0005;
+
+       input_set_capability(input, EV_SW, SW_LID);
+
+       error = input_register_device(input);
+       if (error)
+               goto out_err;
+
+       s3_wmi.input = input;
+
+       return 0;
+ out_err:
+       input_free_device(s3_wmi.input);
+       return error;
+}
+
+static int __init s3_wmi_probe(struct platform_device *pdev)
+{
+       int error;
+
+       if (!dmi_check_system(surface3_dmi_table))
+               return -ENODEV;
+
+       memset(&s3_wmi, 0, sizeof(s3_wmi));
+
+       bus_for_each_dev(&platform_bus_type, NULL, NULL,
+                        s3_wmi_check_platform_device);
+
+       if (!s3_wmi.touchscreen_adev)
+               return -ENODEV;
+
+       acpi_bus_trim(s3_wmi.pnp0c0d_adev);
+
+       error = s3_wmi_create_and_register_input(pdev);
+       if (error)
+               goto restore_acpi_lid;
+
+       acpi_initialize_hp_context(s3_wmi.touchscreen_adev, &s3_wmi.hp,
+                                  s3_wmi_hp_notify, NULL);
+
+       s3_wmi_send_lid_state();
+
+       return 0;
+
+ restore_acpi_lid:
+       acpi_bus_scan(s3_wmi.pnp0c0d_adev->handle);
+       return error;
+}
+
+static int s3_wmi_remove(struct platform_device *device)
+{
+       /* remove the hotplug context from the acpi device */
+       s3_wmi.touchscreen_adev->hp = NULL;
+
+       /* reinstall the actual PNPC0C0D LID default handle */
+       acpi_bus_scan(s3_wmi.pnp0c0d_adev->handle);
+       return 0;
+}
+
+#ifdef CONFIG_PM
+static int s3_wmi_resume(struct device *dev)
+{
+       s3_wmi_send_lid_state();
+       return 0;
+}
+#endif
+static SIMPLE_DEV_PM_OPS(s3_wmi_pm, NULL, s3_wmi_resume);
+
+static struct platform_driver s3_wmi_driver = {
+       .driver = {
+               .name = "surface3-wmi",
+               .pm = &s3_wmi_pm,
+       },
+       .remove = s3_wmi_remove,
+};
+
+static int __init s3_wmi_init(void)
+{
+       int error;
+
+       s3_wmi_pdev = platform_device_alloc("surface3-wmi", -1);
+       if (!s3_wmi_pdev)
+               return -ENOMEM;
+
+       error = platform_device_add(s3_wmi_pdev);
+       if (error)
+               goto err_device_put;
+
+       error = platform_driver_probe(&s3_wmi_driver, s3_wmi_probe);
+       if (error)
+               goto err_device_del;
+
+       pr_info("Surface 3 WMI Extras loaded\n");
+       return 0;
+
+ err_device_del:
+       platform_device_del(s3_wmi_pdev);
+ err_device_put:
+       platform_device_put(s3_wmi_pdev);
+       return error;
+}
+
+static void __exit s3_wmi_exit(void)
+{
+       platform_device_unregister(s3_wmi_pdev);
+       platform_driver_unregister(&s3_wmi_driver);
+}
+
+module_init(s3_wmi_init);
+module_exit(s3_wmi_exit);