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Date: Sun, 23 Nov 2014 16:09:19 +0100
From: Pali Rohár <pali.rohar@...il.com>
To: Matthew Garrett <mjg59@...f.ucam.org>,
Darren Hart <dvhart@...radead.org>
Cc: platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
Gabriele Mazzotta <gabriele.mzt@...il.com>,
Alex Hung <alex.hung@...onical.com>,
Pali Rohár <pali.rohar@...il.com>
Subject: [PATCH 1/3] platform: x86: dell-rbtn: Dell Airplane Mode Switch driver
This is an ACPI driver for Dell laptops which receive HW switch events.
It exports rfkill device dell-rbtn which provide correct hard rfkill state.
It does not provide support for setting soft rfkill state yet.
Signed-off-by: Pali Rohár <pali.rohar@...il.com>
---
drivers/platform/x86/Kconfig | 13 +++
drivers/platform/x86/Makefile | 1 +
drivers/platform/x86/dell-rbtn.c | 179 ++++++++++++++++++++++++++++++++++++++
3 files changed, 193 insertions(+)
create mode 100644 drivers/platform/x86/dell-rbtn.c
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 4dcfb71..5a2ba64 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -137,6 +137,19 @@ config DELL_SMO8800
To compile this driver as a module, choose M here: the module will
be called dell-smo8800.
+config DELL_RBTN
+ tristate "Dell Airplane Mode Switch driver"
+ depends on ACPI
+ depends on RFKILL
+ ---help---
+ Say Y here if you want to support Dell Airplane Mode Switch ACPI
+ device on Dell laptops. Sometimes it has names: DELLABCE or DELRBTN.
+ This driver register rfkill device and receives HW rfkill events
+ (when wifi/bluetooth was enabled) and set correct hard rfkill state.
+
+ To compile this driver as a module, choose M here: the module will
+ be called dell-rbtn.
+
config FUJITSU_LAPTOP
tristate "Fujitsu Laptop Extras"
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index f82232b..b3e54ed 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_DELL_LAPTOP) += dell-laptop.o
obj-$(CONFIG_DELL_WMI) += dell-wmi.o
obj-$(CONFIG_DELL_WMI_AIO) += dell-wmi-aio.o
obj-$(CONFIG_DELL_SMO8800) += dell-smo8800.o
+obj-$(CONFIG_DELL_RBTN) += dell-rbtn.o
obj-$(CONFIG_ACER_WMI) += acer-wmi.o
obj-$(CONFIG_ACERHDF) += acerhdf.o
obj-$(CONFIG_HP_ACCEL) += hp_accel.o
diff --git a/drivers/platform/x86/dell-rbtn.c b/drivers/platform/x86/dell-rbtn.c
new file mode 100644
index 0000000..f1f039a
--- /dev/null
+++ b/drivers/platform/x86/dell-rbtn.c
@@ -0,0 +1,179 @@
+/*
+ Dell Airplane Mode Switch driver
+ Copyright (C) 2014 Pali Rohár <pali.rohar@...il.com>
+
+ 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; either version 2 of the License, or
+ (at your option) any later version.
+
+ 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.
+*/
+
+#include <linux/module.h>
+#include <linux/acpi.h>
+#include <linux/rfkill.h>
+
+/*** helper functions ***/
+
+static int rbtn_check(struct acpi_device *device)
+{
+ acpi_status status;
+ unsigned long long output;
+
+ status = acpi_evaluate_integer(device->handle, "CRBT", NULL, &output);
+ if (ACPI_FAILURE(status))
+ return -EINVAL;
+
+ if (output > 3)
+ return -EINVAL;
+
+ return 0;
+}
+
+
+/*** rfkill ops ***/
+
+static void rbtn_query(struct rfkill *rfkill, void *data)
+{
+ struct acpi_device *device = data;
+ acpi_status status;
+ unsigned long long output;
+
+ status = acpi_evaluate_integer(device->handle, "GRBT", NULL, &output);
+ if (ACPI_FAILURE(status))
+ return;
+
+ rfkill_set_states(rfkill, !output, !output);
+}
+
+static int rbtn_set_block(void *data, bool blocked)
+{
+ /* FIXME: setting soft rfkill cause problems, so disable it for now */
+ return -EINVAL;
+}
+
+struct rfkill_ops rbtn_ops = {
+ .query = rbtn_query,
+ .set_block = rbtn_set_block,
+};
+
+
+/*** acpi driver ***/
+
+static int rbtn_add(struct acpi_device *device);
+static int rbtn_remove(struct acpi_device *device);
+static void rbtn_notify(struct acpi_device *device, u32 event);
+
+static const struct acpi_device_id rbtn_ids[] = {
+ { "DELRBTN", 0 },
+ { "DELLABCE", 0 },
+ { "", 0 },
+};
+
+static struct acpi_driver rbtn_driver = {
+ .name = "dell-rbtn",
+ .ids = rbtn_ids,
+ .ops = {
+ .add = rbtn_add,
+ .remove = rbtn_remove,
+ .notify = rbtn_notify,
+ },
+ .owner = THIS_MODULE,
+};
+
+
+/*** rfkill enable/disable ***/
+
+static int rbtn_enable(struct acpi_device *device)
+{
+ struct rfkill *rfkill = device->driver_data;
+ int ret;
+
+ if (rfkill)
+ return 0;
+
+ /* NOTE: rbtn controls all radio devices, not only WLAN
+ but rfkill interface does not support "ANY" type
+ so "WLAN" type is used
+ */
+ rfkill = rfkill_alloc("dell-rbtn", &device->dev, RFKILL_TYPE_WLAN,
+ &rbtn_ops, device);
+ if (!rfkill)
+ return -ENOMEM;
+
+ ret = rfkill_register(rfkill);
+ if (ret) {
+ rfkill_destroy(rfkill);
+ return ret;
+ }
+
+ device->driver_data = rfkill;
+ return 0;
+}
+
+static void rbtn_disable(struct acpi_device *device)
+{
+ struct rfkill *rfkill = device->driver_data;
+
+ if (!rfkill)
+ return;
+
+ rfkill_unregister(rfkill);
+ rfkill_destroy(rfkill);
+ device->driver_data = NULL;
+}
+
+
+/*** acpi driver functions ***/
+
+static int rbtn_add(struct acpi_device *device)
+{
+ int ret;
+
+ ret = rbtn_check(device);
+ if (ret < 0)
+ return ret;
+
+ return rbtn_enable(device);
+}
+
+static int rbtn_remove(struct acpi_device *device)
+{
+ rbtn_disable(device);
+ return 0;
+}
+
+static void rbtn_notify(struct acpi_device *device, u32 event)
+{
+ struct rfkill *rfkill = device->driver_data;
+
+ if (event == 0x80)
+ rbtn_query(rfkill, device);
+ else
+ dev_info(&device->dev, "Received unknown event (0x%x)\n", event);
+}
+
+
+/*** module functions ***/
+
+static int __init rbtn_init(void)
+{
+ return acpi_bus_register_driver(&rbtn_driver);
+}
+
+static void __exit rbtn_exit(void)
+{
+ acpi_bus_unregister_driver(&rbtn_driver);
+}
+
+module_init(rbtn_init);
+module_exit(rbtn_exit);
+
+MODULE_DEVICE_TABLE(acpi, rbtn_ids);
+MODULE_DESCRIPTION("Dell Airplane Mode Switch driver");
+MODULE_AUTHOR("Pali Rohár <pali.rohar@...il.com>");
+MODULE_LICENSE("GPL");
--
1.7.9.5
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