@@ -89,6 +89,9 @@ config HID_GENERIC
If unsure, say Y.
+config HID_HAPTIC
+ bool
+
menu "Special HID drivers"
depends on HID
@@ -4,6 +4,7 @@
#
hid-y := hid-core.o hid-input.o hid-quirks.o
hid-$(CONFIG_DEBUG_FS) += hid-debug.o
+hid-$(CONFIG_HID_HAPTIC) += hid-haptic.o
obj-$(CONFIG_HID) += hid.o
obj-$(CONFIG_UHID) += uhid.o
new file mode 100644
@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * HID Haptic support for Linux
+ *
+ * Copyright (c) 2021 Angela Czubak <acz@semihalf.com>
+ */
+
+#include "hid-haptic.h"
+
+void hid_haptic_feature_mapping(struct hid_device *hdev,
+ struct hid_haptic_device *haptic,
+ struct hid_field *field, struct hid_usage *usage)
+{
+ if (usage->hid == HID_HP_AUTOTRIGGER) {
+ if (usage->usage_index >= field->report_count) {
+ dev_err(&hdev->dev,
+ "HID_HP_AUTOTRIGGER out of range\n");
+ return;
+ }
+
+ hid_device_io_start(hdev);
+ hid_hw_request(hdev, field->report, HID_REQ_GET_REPORT);
+ hid_hw_wait(hdev);
+ hid_device_io_stop(hdev);
+ haptic->default_auto_trigger =
+ field->value[usage->usage_index];
+ haptic->auto_trigger_report = field->report;
+ }
+}
+EXPORT_SYMBOL_GPL(hid_haptic_feature_mapping);
+
+bool hid_haptic_is_forcepad(struct hid_haptic_device *haptic,
+ struct hid_input *hi, struct hid_field *field)
+{
+ if (field->unit == HID_UNIT_GRAM || field->unit == HID_UNIT_NEWTON)
+ haptic->is_forcepad = true;
+ return haptic->is_forcepad;
+}
+EXPORT_SYMBOL_GPL(hid_haptic_is_forcepad);
+
+int hid_haptic_input_mapping(struct hid_device *hdev,
+ struct hid_haptic_device *haptic,
+ struct hid_input *hi,
+ struct hid_field *field, struct hid_usage *usage,
+ unsigned long **bit, int *max)
+{
+ if (usage->hid == HID_HP_MANUALTRIGGER) {
+ haptic->manual_trigger_report = field->report;
+ /* we don't really want to map these fields */
+ return -1;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(hid_haptic_input_mapping);
+
+bool hid_haptic_input_configured(struct hid_device *hdev,
+ struct hid_haptic_device *haptic)
+{
+ if (haptic->auto_trigger_report && haptic->manual_trigger_report)
+ return true;
+
+ return false;
+}
+EXPORT_SYMBOL_GPL(hid_haptic_input_configured);
new file mode 100644
@@ -0,0 +1,113 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * HID Haptic support for Linux
+ *
+ * Copyright (c) 2021 Angela Czubak <acz@semihalf.com>
+ */
+
+/*
+ */
+
+
+#include <linux/hid.h>
+
+#define HID_HAPTIC_ORDINAL_WAVEFORMNONE 1
+#define HID_HAPTIC_ORDINAL_WAVEFORMSTOP 2
+
+#define HID_HAPTIC_PRESS_THRESH 200
+#define HID_HAPTIC_RELEASE_THRESH 180
+
+#define HID_HAPTIC_MODE_DEVICE 0
+#define HID_HAPTIC_MODE_KERNEL 1
+
+struct hid_haptic_effect {
+ u8 *report_buf;
+ struct input_dev *input_dev;
+ struct work_struct work;
+ struct list_head control;
+ struct mutex control_mutex;
+};
+
+struct hid_haptic_effect_node {
+ struct list_head node;
+ struct file *file;
+};
+
+struct hid_haptic_device {
+ struct input_dev *input_dev;
+ struct hid_device *hdev;
+ struct hid_report *auto_trigger_report;
+ struct mutex auto_trigger_mutex;
+ struct workqueue_struct *wq;
+ struct hid_report *manual_trigger_report;
+ struct mutex manual_trigger_mutex;
+ size_t manual_trigger_report_len;
+ int pressed_state;
+ s32 pressure;
+ s32 force_logical_minimum;
+ s32 force_physical_minimum;
+ s32 force_resolution;
+ u32 press_threshold;
+ u32 release_threshold;
+ u32 mode;
+ u32 default_auto_trigger;
+ u32 vendor_page;
+ u32 vendor_id;
+ u32 max_waveform_id;
+ u32 max_duration_id;
+ u16 *hid_usage_map;
+ u32 *duration_map;
+ u16 press_ordinal_orig;
+ u16 press_ordinal_cur;
+ u16 release_ordinal_orig;
+ u16 release_ordinal_cur;
+#define HID_HAPTIC_RELEASE_EFFECT_ID 0
+#define HID_HAPTIC_PRESS_EFFECT_ID 1
+ struct hid_haptic_effect *effect;
+ struct hid_haptic_effect stop_effect;
+ bool is_forcepad;
+};
+
+#ifdef CONFIG_MULTITOUCH_HAPTIC
+void hid_haptic_feature_mapping(struct hid_device *hdev,
+ struct hid_haptic_device *haptic,
+ struct hid_field *field, struct hid_usage
+ *usage);
+bool hid_haptic_is_forcepad(struct hid_haptic_device *haptic,
+ struct hid_input *hi, struct hid_field *field);
+int hid_haptic_input_mapping(struct hid_device *hdev,
+ struct hid_haptic_device *haptic,
+ struct hid_input *hi,
+ struct hid_field *field, struct hid_usage *usage,
+ unsigned long **bit, int *max);
+bool hid_haptic_input_configured(struct hid_device *hdev,
+ struct hid_haptic_device *haptic);
+#else
+static inline
+void hid_haptic_feature_mapping(struct hid_device *hdev,
+ struct hid_haptic_device *haptic,
+ struct hid_field *field, struct hid_usage
+ *usage)
+{}
+static inline
+bool hid_haptic_is_forcepad(struct hid_haptic_device *haptic,
+ struct hid_input *hi, struct hid_field *field)
+{
+ return false;
+}
+static inline
+int hid_haptic_input_mapping(struct hid_device *hdev,
+ struct hid_haptic_device *haptic,
+ struct hid_input *hi,
+ struct hid_field *field, struct hid_usage *usage,
+ unsigned long **bit, int *max)
+{
+ return 0;
+}
+static inline
+bool hid_haptic_input_configured(struct hid_device *hdev,
+ struct hid_haptic_device *haptic)
+{
+ return 0;
+}
+#endif
Define a new structure that contains simple haptic device configuration as well as current state. Add functions that recognize auto trigger and manual trigger reports as well as save their addresses. Recognize the input device as a haptic one if the reports are found. Verify that the pressure unit is either grams or newtons. Mark the input device as a haptic forcepad if the unit is correct. Signed-off-by: Angela Czubak <acz@semihalf.com> --- drivers/hid/Kconfig | 3 ++ drivers/hid/Makefile | 1 + drivers/hid/hid-haptic.c | 65 ++++++++++++++++++++++ drivers/hid/hid-haptic.h | 113 +++++++++++++++++++++++++++++++++++++++ 4 files changed, 182 insertions(+) create mode 100644 drivers/hid/hid-haptic.c create mode 100644 drivers/hid/hid-haptic.h