From: Raghuram Hegde <raghuram.hegde@xxxxxxxxx>
Register ACPI object INTL6205 as platform Bluetooth RfKill
driver to attach/detach Intel Bluetooth controller from
platform USB bus.
Signed-off-by: Raghuram Hegde <raghuram.hegde@xxxxxxxxx>
Signed-off-by: Chethan T N <chethan.tumkur.narayan@xxxxxxxxx>
Signed-off-by: Sukumar Ghorai <sukumar.ghorai@xxxxxxxxx>
---
drivers/platform/x86/Kconfig | 9 +++
drivers/platform/x86/Makefile | 1 +
drivers/platform/x86/intel_bt_rfkill.c | 123 +++++++++++++++++++++++++++++++++
3 files changed, 133 insertions(+)
create mode 100644 drivers/platform/x86/intel_bt_rfkill.c
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 0c1aa6c314f5..bf050ba644c6 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -1229,6 +1229,15 @@ config I2C_MULTI_INSTANTIATE
To compile this driver as a module, choose M here: the module
will be called i2c-multi-instantiate.
+config INTEL_BT_RFKILL
+ tristate "Intel bluetooth platform rfkill support"
+ depends on ACPI
+ depends on RFKILL || !RFKILL
+ ---help---
+ This option adds support for rfkill switch on Intel bluetooth
+ controllers.
+ If you have a PC with Intel Bluetooth controller, choose Y.
+
endif # X86_PLATFORM_DEVICES
config PMC_ATOM
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index e6d1becf81ce..af9ac3cd6151 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -92,3 +92,4 @@ obj-$(CONFIG_MLX_PLATFORM) += mlx-platform.o
obj-$(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_BT_RFKILL) += intel_bt_rfkill.o
diff --git a/drivers/platform/x86/intel_bt_rfkill.c b/drivers/platform/x86/intel_bt_rfkill.c
new file mode 100644
index 000000000000..904440dadb64
--- /dev/null
+++ b/drivers/platform/x86/intel_bt_rfkill.c
@@ -0,0 +1,123 @@
+/*
+ * Intel Bluetooth Rfkill Driver
+ */
+
+#include <linux/module.h>
+#include <linux/acpi.h>
+#include <linux/platform_device.h>
+#include <linux/rfkill.h>
+#include <linux/gpio/consumer.h>
+
+struct intel_bt_rfkill_dev {
+ struct rfkill *rfkill;
+ struct gpio_desc *reset_gpio_handler;
+};
+
+static const struct acpi_gpio_params reset_gpios = { 0, 0, false };
+static const struct acpi_gpio_mapping acpi_intel_bt_rfkill_gpios[] = {
+ { "reset-gpios", &reset_gpios, 1 },
+ { },
+};
+
+static int intel_bt_disable(struct gpio_desc *reset_gpio)
+{
+ if (!reset_gpio)
+ return -EINVAL;
+
+ /* This will detach the Intel BT controller */
+ gpiod_set_value(reset_gpio, 0);
+ return 0;
+}
+
+static int intel_bt_enable(struct gpio_desc *reset_gpio)
+{
+ if (!reset_gpio)
+ return -EINVAL;
+
+ /* This will re-attach the Intel BT controller */
+ gpiod_set_value(reset_gpio, 1);
+ return 0;
+}
+
+/* RFKill handlers */
+static int intel_bt_rfkill_set_block(void *data, bool blocked)
+{
+ struct intel_bt_rfkill_dev *bt_dev = data;
+ int ret;
+
+ if (blocked)
+ ret = intel_bt_disable(bt_dev->reset_gpio_handler);
+ else
+ ret = intel_bt_enable(bt_dev->reset_gpio_handler);
+
+ return ret;
+}
+static const struct rfkill_ops rfk_ops = {
+ .set_block = intel_bt_rfkill_set_block,
+};
+
+/* ACPI object probe */
+static int intel_bt_rfkill_probe(struct platform_device *pdev)
+{
+ struct intel_bt_rfkill_dev *bt_dev;
+ int result;
+
+ bt_dev = devm_kzalloc(&pdev->dev, sizeof(*bt_dev), GFP_KERNEL);
+ if (!bt_dev)
+ return -ENOMEM;
+
+ dev_set_drvdata(&pdev->dev, bt_dev);
+
+ if (acpi_dev_add_driver_gpios(ACPI_COMPANION(&pdev->dev),
+ acpi_intel_bt_rfkill_gpios))
+ return -EINVAL;
+
+ bt_dev->reset_gpio_handler = devm_gpiod_get_optional(&pdev->dev,
+ "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(bt_dev->reset_gpio_handler))
+ return PTR_ERR(bt_dev->reset_gpio_handler);
+
+ bt_dev->rfkill = rfkill_alloc("intel_bluetooth",
+ &pdev->dev,
+ RFKILL_TYPE_BLUETOOTH,
+ &rfk_ops,
+ bt_dev);
+ if (!bt_dev->rfkill)
+ return -ENOMEM;
+
+ result = rfkill_register(bt_dev->rfkill);
+ if (result)
+ rfkill_destroy(bt_dev->rfkill);
+
+ return result;
+}
+
+static int intel_bt_rfkill_remove(struct platform_device *pdev)
+{
+ struct intel_bt_rfkill_dev *bt_dev = dev_get_drvdata(&pdev->dev);
+
+ if (bt_dev->rfkill) {
+ rfkill_unregister(bt_dev->rfkill);
+ rfkill_destroy(bt_dev->rfkill);
+ }
+
+ acpi_dev_remove_driver_gpios(ACPI_COMPANION(&pdev->dev));
+
+ return 0;
+}
+
+static const struct acpi_device_id intel_bt_rfkill_acpi_match[] = {
+ { "INTL6205", 0 },
+ { },
+};
+MODULE_DEVICE_TABLE(acpi, intel_bt_rfkill_acpi_match);
+
+static struct platform_driver intel_bt_rfkill_driver = {
+ .probe = intel_bt_rfkill_probe,
+ .remove = intel_bt_rfkill_remove,
+ .driver = {
+ .name = "intel_bt_rfkill",
+ .acpi_match_table = ACPI_PTR(intel_bt_rfkill_acpi_match),
+ },
+};
+module_platform_driver(intel_bt_rfkill_driver);
--
2.7.4
