linux-kernel - [PATCH 08/11] HID: haptic: add functions handling events

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Message-ID: <20250714-support-forcepads-v1-8-71c7c05748c9@google.com>
Date: Mon, 14 Jul 2025 15:09:41 +0000
From: Jonathan Denose <jdenose@...gle.com>
To: Jiri Kosina <jikos@...nel.org>, Benjamin Tissoires <bentiss@...nel.org>, 
	Dmitry Torokhov <dmitry.torokhov@...il.com>, Jonathan Corbet <corbet@....net>, 
	Henrik Rydberg <rydberg@...math.org>
Cc: linux-input@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-doc@...r.kernel.org, Angela Czubak <aczubak@...gle.com>, 
	"Sean O'Brien" <seobrien@...gle.com>, Jonathan Denose <jdenose@...gle.com>
Subject: [PATCH 08/11] HID: haptic: add functions handling events

From: Angela Czubak <aczubak@...gle.com>

Implement hid_haptic_handle_press_release() which generates haptic feedback
as well as saves the pressed state of the haptic device.
Add functions to increase and reset the state of the pressure detected by
the device.

Signed-off-by: Angela Czubak <aczubak@...gle.com>
Co-developed-by: Jonathan Denose <jdenose@...gle.com>
Signed-off-by: Jonathan Denose <jdenose@...gle.com>
---
 drivers/hid/hid-haptic.c | 20 +++++++++++++++++++-
 drivers/hid/hid-haptic.h |  4 ++++
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/drivers/hid/hid-haptic.c b/drivers/hid/hid-haptic.c
index 923b685f0e1e81b7f95567b11209af264c522373..760dd1d70583489c07e199943ebba361d347bfa4 100644
--- a/drivers/hid/hid-haptic.c
+++ b/drivers/hid/hid-haptic.c
@@ -50,8 +50,13 @@ EXPORT_SYMBOL_GPL(hid_haptic_feature_mapping);
 bool hid_haptic_check_pressure_unit(struct hid_haptic_device *haptic,
 				    struct hid_input *hi, struct hid_field *field)
 {
-	if (field->unit == HID_UNIT_GRAM || field->unit == HID_UNIT_NEWTON)
+	if (field->unit == HID_UNIT_GRAM || field->unit == HID_UNIT_NEWTON) {
+		haptic->force_logical_minimum = field->logical_minimum;
+		haptic->force_physical_minimum = field->physical_minimum;
+		haptic->force_resolution = input_abs_get_res(hi->input,
+							     ABS_MT_PRESSURE);
 		return true;
+	}
 	return false;
 }
 EXPORT_SYMBOL_GPL(hid_haptic_check_pressure_unit);
@@ -508,3 +513,16 @@ int hid_haptic_init(struct hid_device *hdev,
 	return ret;
 }
 EXPORT_SYMBOL_GPL(hid_haptic_init);
+
+void hid_haptic_pressure_reset(struct hid_haptic_device *haptic)
+{
+	haptic->pressure_sum = 0;
+}
+EXPORT_SYMBOL_GPL(hid_haptic_pressure_reset);
+
+void hid_haptic_pressure_increase(struct hid_haptic_device *haptic,
+				 __s32 pressure)
+{
+	haptic->pressure_sum += pressure;
+}
+EXPORT_SYMBOL_GPL(hid_haptic_pressure_increase);
diff --git a/drivers/hid/hid-haptic.h b/drivers/hid/hid-haptic.h
index 9aa910579d09206a2a882a5f708efd8620428f78..0a34b0c6d706a985630962acc41f7a8eb73cd343 100644
--- a/drivers/hid/hid-haptic.h
+++ b/drivers/hid/hid-haptic.h
@@ -73,3 +73,7 @@ int hid_haptic_input_configured(struct hid_device *hdev,
 				struct hid_haptic_device *haptic,
 				struct hid_input *hi);
 int hid_haptic_init(struct hid_device *hdev, struct hid_haptic_device **haptic_ptr);
+void hid_haptic_handle_press_release(struct hid_haptic_device *haptic);
+void hid_haptic_pressure_reset(struct hid_haptic_device *haptic);
+void hid_haptic_pressure_increase(struct hid_haptic_device *haptic,
+				  __s32 pressure);

-- 
2.50.0.727.gbf7dc18ff4-goog