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authorGwendal Grignou <gwendal@chromium.org>2017-01-30 15:47:22 -0800
committerBenson Leung <bleung@chromium.org>2018-05-23 11:56:45 -0700
commitb418f74170d7e066bad802e8563cabdb1b6032c6 (patch)
tree1cffc92b0d868b6aa741037004f3b8ee874bddd4 /drivers/platform/chrome
parentb410b1226620b6c959f1e9c87529acd058e90caf (diff)
downloadop-kernel-dev-b418f74170d7e066bad802e8563cabdb1b6032c6.zip
op-kernel-dev-b418f74170d7e066bad802e8563cabdb1b6032c6.tar.gz
platform: chrome: Add Tablet Switch ACPI driver
Add a kernel driver for GOOG0006, an ACPI driver reporting an event when the tablet switch status changes. On an ACPI based convertible chromebook check evtest display tablet mode switch changes: Available devices: .. /dev/input/event3: Tablet Mode Switch .. Testing ... (interrupt to exit) Event: time 1484879712.604360, type 5 (EV_SW), code 1 (SW_TABLET_MODE), value 1 Event: time 1484879712.604360, -------------- SYN_REPORT ------------ Event: time 1484879715.132228, type 5 (EV_SW), code 1 (SW_TABLET_MODE), value 0 Event: time 1484879715.132228, -------------- SYN_REPORT ------------ ... Check state is updated at resume time when different from suspend time. Signed-off-by: Gwendal Grignou <gwendal@chromium.org> Signed-off-by: Benson Leung <bleung@chromium.org>
Diffstat (limited to 'drivers/platform/chrome')
-rw-r--r--drivers/platform/chrome/Kconfig10
-rw-r--r--drivers/platform/chrome/Makefile1
-rw-r--r--drivers/platform/chrome/chromeos_tbmc.c128
3 files changed, 139 insertions, 0 deletions
diff --git a/drivers/platform/chrome/Kconfig b/drivers/platform/chrome/Kconfig
index e728a96..57aabe6 100644
--- a/drivers/platform/chrome/Kconfig
+++ b/drivers/platform/chrome/Kconfig
@@ -38,6 +38,16 @@ config CHROMEOS_PSTORE
If you have a supported Chromebook, choose Y or M here.
The module will be called chromeos_pstore.
+config CHROMEOS_TBMC
+ tristate "ChromeOS Tablet Switch Controller"
+ depends on ACPI
+ help
+ This option adds a driver for the tablet switch on
+ select Chrome OS systems.
+
+ To compile this driver as a module, choose M here: the
+ module will be called chromeos_tbmc.
+
config CROS_EC_CTL
tristate
diff --git a/drivers/platform/chrome/Makefile b/drivers/platform/chrome/Makefile
index ff3b369..e44c37a 100644
--- a/drivers/platform/chrome/Makefile
+++ b/drivers/platform/chrome/Makefile
@@ -2,6 +2,7 @@
obj-$(CONFIG_CHROMEOS_LAPTOP) += chromeos_laptop.o
obj-$(CONFIG_CHROMEOS_PSTORE) += chromeos_pstore.o
+obj-$(CONFIG_CHROMEOS_TBMC) += chromeos_tbmc.o
cros_ec_ctl-objs := cros_ec_sysfs.o cros_ec_lightbar.o \
cros_ec_vbc.o cros_ec_debugfs.o
obj-$(CONFIG_CROS_EC_CTL) += cros_ec_ctl.o
diff --git a/drivers/platform/chrome/chromeos_tbmc.c b/drivers/platform/chrome/chromeos_tbmc.c
new file mode 100644
index 0000000..c87e533
--- /dev/null
+++ b/drivers/platform/chrome/chromeos_tbmc.c
@@ -0,0 +1,128 @@
+/*
+ * chromeos_tbmc - Driver to detect Tablet Mode for ChromeOS convertible.
+ *
+ * Copyright 2017 Google, Inc
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ * On Chromebook using ACPI, this device listens for notification
+ * from GOOG0006 and issue method TBMC to retrieve the status.
+ *
+ * GOOG0006 issues the notification when it receives EC_HOST_EVENT_MODE_CHANGE
+ * from the EC.
+ * Method TBMC reads EC_ACPI_MEM_DEVICE_ORIENTATION byte from the shared
+ * memory region.
+ */
+
+#include <linux/acpi.h>
+#include <linux/input.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/printk.h>
+
+#define DRV_NAME "chromeos_tbmc"
+#define ACPI_DRV_NAME "GOOG0006"
+
+static int chromeos_tbmc_query_switch(struct acpi_device *adev,
+ struct input_dev *idev)
+{
+ unsigned long long state;
+ acpi_status status;
+
+ status = acpi_evaluate_integer(adev->handle, "TBMC", NULL, &state);
+ if (ACPI_FAILURE(status))
+ return -ENODEV;
+
+ /* input layer checks if event is redundant */
+ input_report_switch(idev, SW_TABLET_MODE, state);
+ input_sync(idev);
+
+ return 0;
+}
+
+static __maybe_unused int chromeos_tbmc_resume(struct device *dev)
+{
+ struct acpi_device *adev = to_acpi_device(dev);
+
+ return chromeos_tbmc_query_switch(adev, adev->driver_data);
+}
+
+static void chromeos_tbmc_notify(struct acpi_device *adev, u32 event)
+{
+ switch (event) {
+ case 0x80:
+ chromeos_tbmc_query_switch(adev, adev->driver_data);
+ break;
+ default:
+ dev_err(&adev->dev, "Unexpected event: 0x%08X\n", event);
+ }
+}
+
+static int chromeos_tbmc_open(struct input_dev *idev)
+{
+ struct acpi_device *adev = input_get_drvdata(idev);
+
+ return chromeos_tbmc_query_switch(adev, idev);
+}
+
+static int chromeos_tbmc_add(struct acpi_device *adev)
+{
+ struct input_dev *idev;
+ struct device *dev = &adev->dev;
+ int ret;
+
+ idev = devm_input_allocate_device(dev);
+ if (!idev)
+ return -ENOMEM;
+
+ idev->name = "Tablet Mode Switch";
+ idev->phys = acpi_device_hid(adev);
+
+ idev->id.bustype = BUS_HOST;
+ idev->id.version = 1;
+ idev->id.product = 0;
+ idev->open = chromeos_tbmc_open;
+
+ input_set_drvdata(idev, adev);
+ adev->driver_data = idev;
+
+ input_set_capability(idev, EV_SW, SW_TABLET_MODE);
+ ret = input_register_device(idev);
+ if (ret) {
+ dev_err(dev, "cannot register input device\n");
+ return ret;
+ }
+ return 0;
+}
+
+static const struct acpi_device_id chromeos_tbmc_acpi_device_ids[] = {
+ { ACPI_DRV_NAME, 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(acpi, chromeos_tbmc_acpi_device_ids);
+
+static const SIMPLE_DEV_PM_OPS(chromeos_tbmc_pm_ops, NULL,
+ chromeos_tbmc_resume);
+
+static struct acpi_driver chromeos_tbmc_driver = {
+ .name = DRV_NAME,
+ .class = DRV_NAME,
+ .ids = chromeos_tbmc_acpi_device_ids,
+ .ops = {
+ .add = chromeos_tbmc_add,
+ .notify = chromeos_tbmc_notify,
+ },
+ .drv.pm = &chromeos_tbmc_pm_ops,
+};
+
+module_acpi_driver(chromeos_tbmc_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("ChromeOS ACPI tablet switch driver");
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