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GET /api/patches/2218212/?format=api
{ "id": 2218212, "url": "http://patchwork.ozlabs.org/api/patches/2218212/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260331170823.72511-6-soumyajyotisarkar23@gmail.com/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/projects/14/?format=api", "name": "QEMU Development", "link_name": "qemu-devel", "list_id": "qemu-devel.nongnu.org", "list_email": "qemu-devel@nongnu.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260331170823.72511-6-soumyajyotisarkar23@gmail.com>", "list_archive_url": null, "date": "2026-03-31T17:08:23", "name": "[RFC,5/5] input/hid: apply multiplier scaling with residual accumulation", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "702915282fc36cd0ae1cad5f21dc402ed6a82b63", "submitter": { "id": 91019, "url": "http://patchwork.ozlabs.org/api/people/91019/?format=api", "name": "Soumyajyotii Ssarkar", "email": "soumyajyotisarkar23@gmail.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260331170823.72511-6-soumyajyotisarkar23@gmail.com/mbox/", "series": [ { "id": 498231, "url": "http://patchwork.ozlabs.org/api/series/498231/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=498231", "date": "2026-03-31T17:08:18", "name": "Add high-resolution 2D mouse wheel support to USB HID", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/498231/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2218212/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2218212/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=lB9+2sk7;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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helo=mail-pf1-x444.google.com", "X-Spam_score_int": "-17", "X-Spam_score": "-1.8", "X-Spam_bar": "-", "X-Spam_report": "(-1.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001,\n RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 autolearn=ham autolearn_force=no", "X-Spam_action": "no action", "X-BeenThere": "qemu-devel@nongnu.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "qemu development <qemu-devel.nongnu.org>", "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>", "List-Archive": "<https://lists.nongnu.org/archive/html/qemu-devel>", "List-Post": "<mailto:qemu-devel@nongnu.org>", "List-Help": "<mailto:qemu-devel-request@nongnu.org?subject=help>", "List-Subscribe": "<https://lists.nongnu.org/mailman/listinfo/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=subscribe>", "Errors-To": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org", "Sender": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org" }, "content": "Implement multiplier-based scaling with residual accumulation for\nfine-grained mouse wheel and pan sensitivity control in report mode.\n\nApplies divisor based scaling (1, 4, 8, 16) based on negotiated\nmultiplier values.\nThen uses residual based approach to prevent precision loss:\n\n residual += delta\n output = residual / divisor\n residual -= output * divisor\n\nResidual state preserved across VM migrations via VMState.\n\nSigned-off-by: Soumyajyotii Ssarkar <soumyajyotisarkar23@gmail.com>\n---\n hw/input/hid.c | 60 ++++++++++++++++++++++++++++++++++++++++++\n include/hw/input/hid.h | 2 ++\n 2 files changed, 62 insertions(+)\n\n--\n2.53.0", "diff": "diff --git a/hw/input/hid.c b/hw/input/hid.c\nindex d0b7af7c13..9b800faeb0 100644\n--- a/hw/input/hid.c\n+++ b/hw/input/hid.c\n@@ -365,6 +365,7 @@ void hid_pointer_activate(HIDState *hs)\n int hid_pointer_poll(HIDState *hs, uint8_t *buf, int len)\n {\n int dx, dy, dz, pan, l;\n+ int wheel_divisor, pan_divisor;\n int index;\n HIDPointerEvent *e;\n\n@@ -392,6 +393,54 @@ int hid_pointer_poll(HIDState *hs, uint8_t *buf, int len)\n e->pan -= pan;\n\n\n+ if (hs->kind == HID_MOUSE && hs->protocol != 0) {\n+ switch (hs->ptr.wheel_multiplier & 0x03) {\n+ case 0:\n+ wheel_divisor = 1;\n+ break;\n+ case 1:\n+ wheel_divisor = 4;\n+ break;\n+ case 2:\n+ wheel_divisor = 8;\n+ break;\n+ default:\n+ wheel_divisor = 16;\n+ break;\n+ }\n+\n+ switch (hs->ptr.pan_multiplier & 0x03) {\n+ case 0:\n+ pan_divisor = 1;\n+ break;\n+ case 1:\n+ pan_divisor = 4;\n+ break;\n+ case 2:\n+ pan_divisor = 8;\n+ break;\n+ default:\n+ pan_divisor = 16;\n+ break;\n+ }\n+\n+ if (wheel_divisor > 1) {\n+ hs->ptr.wheel_residual += dz;\n+ dz = hs->ptr.wheel_residual / wheel_divisor;\n+ hs->ptr.wheel_residual -= dz * wheel_divisor;\n+ } else {\n+ hs->ptr.wheel_residual = 0;\n+ }\n+\n+ if (pan_divisor > 1) {\n+ hs->ptr.pan_residual += pan;\n+ pan = hs->ptr.pan_residual / pan_divisor;\n+ hs->ptr.pan_residual -= pan * pan_divisor;\n+ } else {\n+ hs->ptr.pan_residual = 0;\n+ }\n+ }\n+\n if (hs->n &&\n !e->dz &&\n !e->pan &&\n@@ -405,6 +454,7 @@ int hid_pointer_poll(HIDState *hs, uint8_t *buf, int len)\n dz = 0 - dz;\n pan = 0 - pan;\n l = 0;\n+\n switch (hs->kind) {\n case HID_MOUSE:\n if (hs->protocol == 0) {\n@@ -528,6 +578,11 @@ void hid_reset(HIDState *hs)\n case HID_MOUSE:\n case HID_TABLET:\n memset(hs->ptr.queue, 0, sizeof(hs->ptr.queue));\n+ hs->ptr.mouse_grabbed = 0;\n+ hs->ptr.wheel_multiplier = 0;\n+ hs->ptr.pan_multiplier = 0;\n+ hs->ptr.wheel_residual = 0;\n+ hs->ptr.pan_residual = 0;\n break;\n }\n hs->head = 0;\n@@ -619,6 +674,7 @@ static const VMStateDescription vmstate_hid_ptr_queue = {\n VMSTATE_INT32(xdx, HIDPointerEvent),\n VMSTATE_INT32(ydy, HIDPointerEvent),\n VMSTATE_INT32(dz, HIDPointerEvent),\n+ VMSTATE_INT32(pan, HIDPointerEvent),\n VMSTATE_INT32(buttons_state, HIDPointerEvent),\n VMSTATE_END_OF_LIST()\n }\n@@ -636,6 +692,10 @@ const VMStateDescription vmstate_hid_ptr_device = {\n VMSTATE_UINT32(n, HIDState),\n VMSTATE_INT32(protocol, HIDState),\n VMSTATE_UINT8(idle, HIDState),\n+ VMSTATE_UINT8(ptr.wheel_multiplier, HIDState),\n+ VMSTATE_UINT8(ptr.pan_multiplier, HIDState),\n+ VMSTATE_INT32(ptr.wheel_residual, HIDState),\n+ VMSTATE_INT32(ptr.pan_residual, HIDState),\n VMSTATE_END_OF_LIST(),\n }\n };\ndiff --git a/include/hw/input/hid.h b/include/hw/input/hid.h\nindex 1a1941d371..db902fa023 100644\n--- a/include/hw/input/hid.h\n+++ b/include/hw/input/hid.h\n@@ -25,6 +25,8 @@ typedef struct HIDMouseState {\n int mouse_grabbed;\n uint8_t wheel_multiplier;\n uint8_t pan_multiplier;\n+ int32_t wheel_residual;\n+ int32_t pan_residual;\n } HIDMouseState;\n\n typedef struct HIDKeyboardState {\n", "prefixes": [ "RFC", "5/5" ] }