1 // SPDX-License-Identifier: GPL-2.0-only
7  * Twin device code is hugely inspired by the ALPS driver.
67  * struct vmmouse_data - private data structure for the vmmouse driver
69  * @abs_dev: "Absolute" device used to report absolute mouse movement.
70  * @phys: Physical path for the absolute device.
71  * @dev_name: Name attribute name for the absolute device.
80  * Hypervisor-specific bi-directional communication channel
102  * vmmouse_report_button - report button state on the correct input device
105  * @abs_dev:  The absolute input device
106  * @rel_dev:  The relative input device
107  * @pref_dev: The preferred device for reporting
112  * pressed on the other device, in which case the state is reported on that
113  * device.
121 	if (test_bit(code, abs_dev->key))  in vmmouse_report_button()
123 	else if (test_bit(code, rel_dev->key))  in vmmouse_report_button()
130  * vmmouse_report_events - process events on the vmmouse communications channel
135  * reports them on the correct (absolute or relative) input device. When the
138  * host- or synchronization error, the function returns PSMOUSE_BAD_DATA in
143 	struct input_dev *rel_dev = psmouse->dev;  in vmmouse_report_events()
144 	struct vmmouse_data *priv = psmouse->private;  in vmmouse_report_events()
145 	struct input_dev *abs_dev = priv->abs_dev;  in vmmouse_report_events()
152 	while (count--) {  in vmmouse_report_events()
179 		 * events on the same device where we report motion events.  in vmmouse_report_events()
182 		 * preferred device as well.  in vmmouse_report_events()
187 			input_report_rel(rel_dev, REL_Y, -(s32)y);  in vmmouse_report_events()
195 		input_report_rel(rel_dev, REL_WHEEL, -(s8)((u8) z));  in vmmouse_report_events()
214  * vmmouse_process_byte - process data on the ps/2 channel
225 	unsigned char *packet = psmouse->packet;  in vmmouse_process_byte()
227 	switch (psmouse->pktcnt) {  in vmmouse_process_byte()
241  * vmmouse_disable - Disable vmmouse
259 		psmouse_warn(psmouse, "failed to disable vmmouse device\n");  in vmmouse_disable()
263  * vmmouse_enable - Enable vmmouse and request absolute mode.
269  * Returns 0 on success, -ENODEV on failure.
273 	u32 status, version;  in vmmouse_enable()  local
277 	 * Try enabling the device. If successful, we should be able to  in vmmouse_enable()
278 	 * read valid version ID back from it.  in vmmouse_enable()
284 	 * See if version ID can be retrieved.  in vmmouse_enable()
288 		psmouse_dbg(psmouse, "empty flags - assuming no device\n");  in vmmouse_enable()
289 		return -ENXIO;  in vmmouse_enable()
293 		    version, dummy1, dummy2, dummy3);  in vmmouse_enable()
294 	if (version != VMMOUSE_VERSION_ID) {  in vmmouse_enable()
295 		psmouse_dbg(psmouse, "Unexpected version value: %u vs %u\n",  in vmmouse_enable()
296 			    (unsigned) version, VMMOUSE_VERSION_ID);  in vmmouse_enable()
298 		return -ENXIO;  in vmmouse_enable()
322  * vmmouse_check_hypervisor - Check if we're running on a supported hypervisor
336  * vmmouse_detect - Probe whether vmmouse is available
345 	u32 response, version, dummy1, dummy2;  in vmmouse_detect()  local
350 		return -ENXIO;  in vmmouse_detect()
353 	/* Check if the device is present */  in vmmouse_detect()
355 	VMMOUSE_CMD(GETVERSION, 0, version, response, dummy1, dummy2);  in vmmouse_detect()
356 	if (response != VMMOUSE_PROTO_MAGIC || version == 0xffffffffU)  in vmmouse_detect()
357 		return -ENXIO;  in vmmouse_detect()
360 		psmouse->vendor = VMMOUSE_VENDOR;  in vmmouse_detect()
361 		psmouse->name = VMMOUSE_NAME;  in vmmouse_detect()
362 		psmouse->model = version;  in vmmouse_detect()
369  * vmmouse_disconnect - Take down vmmouse driver
377 	struct vmmouse_data *priv = psmouse->private;  in vmmouse_disconnect()
381 	input_unregister_device(priv->abs_dev);  in vmmouse_disconnect()
386  * vmmouse_reconnect - Reset the ps/2 - and vmmouse connections
391  * -1 on failure.
402 			    "Unable to re-enable mouse when reconnecting, err: %d\n",  in vmmouse_reconnect()
411  * vmmouse_init - Initialize the vmmouse driver
415  * Requests the device and tries to enable vmmouse mode.
416  * If successful, sets up the input device for relative movement events.
417  * It also allocates another input device and sets it up for absolute motion
418  * events. Returns 0 on success and -1 on failure.
423 	struct input_dev *rel_dev = psmouse->dev, *abs_dev;  in vmmouse_init()
434 		error = -ENOMEM;  in vmmouse_init()
438 	priv->abs_dev = abs_dev;  in vmmouse_init()
439 	psmouse->private = priv;  in vmmouse_init()
441 	/* Set up and register absolute device */  in vmmouse_init()
442 	snprintf(priv->phys, sizeof(priv->phys), "%s/input1",  in vmmouse_init()
443 		 psmouse->ps2dev.serio->phys);  in vmmouse_init()
445 	/* Mimic name setup for relative device in psmouse-base.c */  in vmmouse_init()
446 	snprintf(priv->dev_name, sizeof(priv->dev_name), "%s %s %s",  in vmmouse_init()
448 	abs_dev->phys = priv->phys;  in vmmouse_init()
449 	abs_dev->name = priv->dev_name;  in vmmouse_init()
450 	abs_dev->id.bustype = BUS_I8042;  in vmmouse_init()
451 	abs_dev->id.vendor = 0x0002;  in vmmouse_init()
452 	abs_dev->id.product = PSMOUSE_VMMOUSE;  in vmmouse_init()
453 	abs_dev->id.version = psmouse->model;  in vmmouse_init()
454 	abs_dev->dev.parent = &psmouse->ps2dev.serio->dev;  in vmmouse_init()
456 	/* Set absolute device capabilities */  in vmmouse_init()
465 	error = input_register_device(priv->abs_dev);  in vmmouse_init()
469 	/* Add wheel capability to the relative device */  in vmmouse_init()
472 	psmouse->protocol_handler = vmmouse_process_byte;  in vmmouse_init()
473 	psmouse->disconnect = vmmouse_disconnect;  in vmmouse_init()
474 	psmouse->reconnect = vmmouse_reconnect;  in vmmouse_init()
483 	psmouse->private = NULL;  in vmmouse_init()