We need support to various accessories on the device,
some requiring switch does not exist in switch list.
So added switch for the following purpose.
SW_EXT_PEN_ATTACHED is for the checking the external pen
attached or not on the device. We also added driver
that uses such event.
Signed-off-by: Hyungjae Im
---
drivers/input/Kconfig | 12 ++
drivers/input/Makefile | 1 +
drivers/input/ext_pen_detect.c | 237 +
include/linux/mod_devicetable.h| 2 +-
include/uapi/linux/input-event-codes.h | 3 +-
5 files changed, 253 insertions(+), 2 deletions(-)
create mode 100644 drivers/input/ext_pen_detect.c
diff --git a/drivers/input/Kconfig b/drivers/input/Kconfig
index ba5e7444c547..5d6d15c8f7e7 100644
--- a/drivers/input/Kconfig
+++ b/drivers/input/Kconfig
@@ -197,6 +197,18 @@ config INPUT_COVER_DETECT
To compile this driver as a module, choose M here: the
module will be called cover_detect.
+config INPUT_EXT_PEN_DETECT
+ tristate "Enable external pen attach detection"
+ help
+ Say Y here to enable external pen detection
+ and send a event when external pen is attached/detached.
+ Active gpio state is low and active event value is 0.
+
+ If unsure, say N.
+
+ To compile this driver as a module, choose M here: the
+ module will be called ext_pen_detect.
+
comment "Input Device Drivers"
source "drivers/input/keyboard/Kconfig"
diff --git a/drivers/input/Makefile b/drivers/input/Makefile
index fc8dd9091821..0ccf02e34557 100644
--- a/drivers/input/Makefile
+++ b/drivers/input/Makefile
@@ -31,3 +31,4 @@ obj-$(CONFIG_INPUT_APMPOWER) += apm-power.o
obj-$(CONFIG_RMI4_CORE)+= rmi4/
obj-$(CONFIG_INPUT_COVER_DETECT)+= cover_detect.o
+obj-$(CONFIG_INPUT_EXT_PEN_DETECT)+= ext_pen_detect.o
diff --git a/drivers/input/ext_pen_detect.c b/drivers/input/ext_pen_detect.c
new file mode 100644
index ..9a0d106e49f8
--- /dev/null
+++ b/drivers/input/ext_pen_detect.c
@@ -0,0 +1,237 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Support detection pen attachment externally on device
+ *
+ * Copyright (C) 2020 Samsung Electronics Co. Ltd. All Rights Reserved.
+ *
+ */
+
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+
+struct ext_pen_detect_drvdata {
+ struct input_dev *input;
+ struct delayed_work ext_pen_detect_dwork;
+ struct wakeup_source *ws;
+ int gpio_ext_pen_detect;
+ int irq_ext_pen_detect;
+};
+
+static void ext_pen_detect_work(struct work_struct *work)
+{
+ struct ext_pen_detect_drvdata *ddata =
+ container_of(work, struct ext_pen_detect_drvdata,
+ ext_pen_detect_dwork.work);
+ bool ext_pen_status;
+
+ ext_pen_status = gpio_get_value(ddata->gpio_ext_pen_detect);
+
+ input_report_switch(ddata->input,
+ SW_EXT_PEN_ATTACHED, ext_pen_status);
+ input_sync(ddata->input);
+}
+
+static void __ext_pen_detect(struct ext_pen_detect_drvdata *ddata,
+ bool ext_pen_status)
+{
+ cancel_delayed_work_sync(>ext_pen_detect_dwork);
+ if (ext_pen_status) {
+ __pm_wakeup_event(ddata->ws, jiffies_to_msecs(HZ / 20));
+ schedule_delayed_work(>ext_pen_detect_dwork,
+ HZ * 1 / 100);
+ } else {
+ __pm_relax(ddata->ws);
+ schedule_delayed_work(>ext_pen_detect_dwork, 0);
+ }
+}
+
+static irqreturn_t ext_pen_detect_irq(int irq, void *dev_id)
+{
+ bool ext_pen_status;
+ struct ext_pen_detect_drvdata *ddata = dev_id;
+
+ ext_pen_status = gpio_get_value(ddata->gpio_ext_pen_detect);
+
+ __ext_pen_detect(ddata, ext_pen_status);
+
+ return IRQ_HANDLED;
+}
+
+static int ext_pen_detect_open(struct input_dev *input)
+{
+ struct ext_pen_detect_drvdata *ddata = input_get_drvdata(input);
+ /* update the current status */
+ schedule_delayed_work(>ext_pen_detect_dwork, HZ / 2);
+ /* Report current state of buttons that are connected to GPIOs */
+ input_sync(input);
+
+ return 0;
+}
+
+static void ext_pen_detect_close(struct input_dev *input)
+{
+}
+
+static void init_ext_pen_detect_irq(struct input_dev *input)
+{
+ struct ext_pen_detect_drvdata *ddata = input_get_drvdata(input);
+
+ int ret = 0;
+ int irq = ddata->irq_ext_pen_detect;
+
+ ret = request_threaded_irq(
+ irq, NULL,
+ ext_pen_detect_irq,
+ IRQF_TRIGGER_RISING |
+ IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+ "ext_pen_detect", ddata);
+ if (ret < 0)
+ pr_err("keys: failed to request ext_pen detect irq %d gpio
%d\n",
+ irq, ddata->gpio_ext_pen_detect);
+}
+
+#ifdef CONFIG_OF
+static
