psmouse-base.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 917 行 · 第 1/2 页

/*
 * psmouse_extensions() probes for any extensions to the basic PS/2 protocol
 * the mouse may have.
 */

static int psmouse_extensions(struct psmouse *psmouse,
			      unsigned int max_proto, int set_properties)
{
	int synaptics_hardware = 0;

/*
 * Try Synaptics TouchPad
 */
	if (max_proto > PSMOUSE_PS2 && synaptics_detect(psmouse)) {
		synaptics_hardware = 1;

		if (set_properties) {
			psmouse->vendor = "Synaptics";
			psmouse->name = "TouchPad";
		}

		if (max_proto > PSMOUSE_IMEX) {
			if (!set_properties || synaptics_init(psmouse) == 0)
				return PSMOUSE_SYNAPTICS;
/*
 * Some Synaptics touchpads can emulate extended protocols (like IMPS/2).
 * Unfortunately Logitech/Genius probes confuse some firmware versions so
 * we'll have to skip them.
 */
			max_proto = PSMOUSE_IMEX;
		}
/*
 * Make sure that touchpad is in relative mode, gestures (taps) are enabled
 */
		synaptics_reset(psmouse);
	}

	if (max_proto > PSMOUSE_IMEX && genius_detect(psmouse)) {

		if (set_properties) {
			set_bit(BTN_EXTRA, psmouse->dev.keybit);
			set_bit(BTN_SIDE, psmouse->dev.keybit);
			set_bit(REL_WHEEL, psmouse->dev.relbit);
			psmouse->vendor = "Genius";
			psmouse->name = "Wheel Mouse";
		}

		return PSMOUSE_GENPS;
	}

	if (max_proto > PSMOUSE_IMEX) {
		int type = ps2pp_init(psmouse, set_properties);
		if (type > PSMOUSE_PS2)
			return type;
	}

	if (max_proto >= PSMOUSE_IMEX && im_explorer_detect(psmouse)) {

		if (set_properties) {
			set_bit(REL_WHEEL, psmouse->dev.relbit);
			set_bit(BTN_SIDE, psmouse->dev.keybit);
			set_bit(BTN_EXTRA, psmouse->dev.keybit);
			if (!psmouse->name)
				psmouse->name = "Explorer Mouse";
		}

		return PSMOUSE_IMEX;
	}

	if (max_proto >= PSMOUSE_IMPS && intellimouse_detect(psmouse)) {

		if (set_properties) {
			set_bit(REL_WHEEL, psmouse->dev.relbit);
			if (!psmouse->name)
				psmouse->name = "Wheel Mouse";
		}

		return PSMOUSE_IMPS;
	}

/*
 * Okay, all failed, we have a standard mouse here. The number of the buttons
 * is still a question, though. We assume 3.
 */
	if (synaptics_hardware) {
/*
 * We detected Synaptics hardware but it did not respond to IMPS/2 probes.
 * We need to reset the touchpad because if there is a track point on the
 * pass through port it could get disabled while probing for protocol
 * extensions.
 */
		psmouse_reset(psmouse);
		psmouse_command(psmouse, NULL, PSMOUSE_CMD_RESET_DIS);
	}

	return PSMOUSE_PS2;
}

/*
 * psmouse_probe() probes for a PS/2 mouse.
 */

static int psmouse_probe(struct psmouse *psmouse)
{
	unsigned char param[2];

/*
 * First, we check if it's a mouse. It should send 0x00 or 0x03
 * in case of an IntelliMouse in 4-byte mode or 0x04 for IM Explorer.
 */

	param[0] = 0xa5;

	if (psmouse_command(psmouse, param, PSMOUSE_CMD_GETID))
		return -1;

	if (param[0] != 0x00 && param[0] != 0x03 && param[0] != 0x04)
		return -1;

/*
 * Then we reset and disable the mouse so that it doesn't generate events.
 */

	if (psmouse_command(psmouse, NULL, PSMOUSE_CMD_RESET_DIS))
		printk(KERN_WARNING "psmouse.c: Failed to reset mouse on %s\n", psmouse->serio->phys);

	return 0;
}

/*
 * Here we set the mouse resolution.
 */

static void psmouse_set_resolution(struct psmouse *psmouse)
{
	unsigned char param[1];

	if (psmouse->type == PSMOUSE_PS2PP && psmouse_resolution > 400) {
		ps2pp_set_800dpi(psmouse);
		return;
	}

	if (!psmouse_resolution || psmouse_resolution >= 200)
		param[0] = 3;
	else if (psmouse_resolution >= 100)
		param[0] = 2;
	else if (psmouse_resolution >= 50)
		param[0] = 1;
	else if (psmouse_resolution)
		param[0] = 0;

        psmouse_command(psmouse, param, PSMOUSE_CMD_SETRES);
}

/*
 * Here we set the mouse report rate.
 */

static void psmouse_set_rate(struct psmouse *psmouse)
{
	unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10, 0 };
	int i = 0;

	while (rates[i] > psmouse_rate) i++;
	psmouse_command(psmouse, rates + i, PSMOUSE_CMD_SETRATE);
}

/*
 * psmouse_initialize() initializes the mouse to a sane state.
 */

static void psmouse_initialize(struct psmouse *psmouse)
{
	unsigned char param[2];

/*
 * We set the mouse report rate, resolution and scaling.
 */

	if (psmouse_max_proto != PSMOUSE_PS2) {
		psmouse_set_rate(psmouse);
		psmouse_set_resolution(psmouse);
		psmouse_command(psmouse,  NULL, PSMOUSE_CMD_SETSCALE11);
	}

/*
 * We set the mouse into streaming mode.
 */

	psmouse_command(psmouse, param, PSMOUSE_CMD_SETSTREAM);
}

/*
 * psmouse_set_state() sets new psmouse state and resets all flags and
 * counters while holding serio lock so fighting with interrupt handler
 * is not a concern.
 */

static void psmouse_set_state(struct psmouse *psmouse, enum psmouse_state new_state)
{
	serio_pause_rx(psmouse->serio);
	psmouse->state = new_state;
	psmouse->pktcnt = psmouse->cmdcnt = psmouse->out_of_sync = 0;
	psmouse->flags = 0;
	serio_continue_rx(psmouse->serio);
}

/*
 * psmouse_activate() enables the mouse so that we get motion reports from it.
 */

static void psmouse_activate(struct psmouse *psmouse)
{
	if (psmouse_command(psmouse, NULL, PSMOUSE_CMD_ENABLE))
		printk(KERN_WARNING "psmouse.c: Failed to enable mouse on %s\n", psmouse->serio->phys);

	psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);
}


/*
 * psmouse_deactivate() puts the mouse into poll mode so that we don't get motion
 * reports from it unless we explicitely request it.
 */

static void psmouse_deactivate(struct psmouse *psmouse)
{
	if (psmouse_command(psmouse, NULL, PSMOUSE_CMD_DISABLE))
		printk(KERN_WARNING "psmouse.c: Failed to deactivate mouse on %s\n", psmouse->serio->phys);

	psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
}


/*
 * psmouse_cleanup() resets the mouse into power-on state.
 */

static void psmouse_cleanup(struct serio *serio)
{
	struct psmouse *psmouse = serio->private;

	psmouse_reset(psmouse);
}

/*
 * psmouse_disconnect() closes and frees.
 */

static void psmouse_disconnect(struct serio *serio)
{
	struct psmouse *psmouse, *parent;

	psmouse = serio->private;
	psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);

	if (serio->parent && (serio->type & SERIO_TYPE) == SERIO_PS_PSTHRU) {
		parent = serio->parent->private;
		if (parent->pt_deactivate)
			parent->pt_deactivate(parent);
	}

	if (psmouse->disconnect)
		psmouse->disconnect(psmouse);

	psmouse_set_state(psmouse, PSMOUSE_IGNORE);

	input_unregister_device(&psmouse->dev);
	serio_close(serio);
	kfree(psmouse);
}

/*
 * psmouse_connect() is a callback from the serio module when
 * an unhandled serio port is found.
 */
static void psmouse_connect(struct serio *serio, struct serio_driver *drv)
{
	struct psmouse *psmouse, *parent = NULL;

	if ((serio->type & SERIO_TYPE) != SERIO_8042 &&
	    (serio->type & SERIO_TYPE) != SERIO_PS_PSTHRU)
		return;

	/*
	 * If this is a pass-through port deactivate parent so the device
	 * connected to this port can be successfully identified
	 */
	if (serio->parent && (serio->type & SERIO_TYPE) == SERIO_PS_PSTHRU) {
		parent = serio->parent->private;
		psmouse_deactivate(parent);
	}

	if (!(psmouse = kmalloc(sizeof(struct psmouse), GFP_KERNEL)))
		goto out;

	memset(psmouse, 0, sizeof(struct psmouse));

	init_waitqueue_head(&psmouse->wait);
	init_input_dev(&psmouse->dev);
	psmouse->dev.evbit[0] = BIT(EV_KEY) | BIT(EV_REL);
	psmouse->dev.keybit[LONG(BTN_MOUSE)] = BIT(BTN_LEFT) | BIT(BTN_MIDDLE) | BIT(BTN_RIGHT);
	psmouse->dev.relbit[0] = BIT(REL_X) | BIT(REL_Y);
	psmouse->serio = serio;
	psmouse->dev.private = psmouse;
	psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);

	serio->private = psmouse;
	if (serio_open(serio, drv)) {
		kfree(psmouse);
		serio->private = NULL;
		goto out;
	}

	if (psmouse_probe(psmouse) < 0) {
		serio_close(serio);
		kfree(psmouse);
		serio->private = NULL;
		goto out;
	}

	psmouse->type = psmouse_extensions(psmouse, psmouse_max_proto, 1);
	if (!psmouse->vendor)
		psmouse->vendor = "Generic";
	if (!psmouse->name)
		psmouse->name = "Mouse";
	if (!psmouse->protocol_handler)
		psmouse->protocol_handler = psmouse_process_byte;

	sprintf(psmouse->devname, "%s %s %s",
		psmouse_protocols[psmouse->type], psmouse->vendor, psmouse->name);
	sprintf(psmouse->phys, "%s/input0",
		serio->phys);

	psmouse->dev.name = psmouse->devname;
	psmouse->dev.phys = psmouse->phys;
	psmouse->dev.id.bustype = BUS_I8042;
	psmouse->dev.id.vendor = 0x0002;
	psmouse->dev.id.product = psmouse->type;
	psmouse->dev.id.version = psmouse->model;

	input_register_device(&psmouse->dev);

	printk(KERN_INFO "input: %s on %s\n", psmouse->devname, serio->phys);

	psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);

	psmouse_initialize(psmouse);

	if (parent && parent->pt_activate)
		parent->pt_activate(parent);

	if (serio->child) {
		/*
		 * Nothing to be done here, serio core will detect that
		 * the driver set serio->child and will register it for us.
		 */
		printk(KERN_INFO "serio: %s port at %s\n", serio->child->name, psmouse->phys);
	}

	psmouse_activate(psmouse);

out:
	/* If this is a pass-through port the parent awaits to be activated */
	if (parent)
		psmouse_activate(parent);
}


static int psmouse_reconnect(struct serio *serio)
{
	struct psmouse *psmouse = serio->private;
	struct psmouse *parent = NULL;
	struct serio_driver *drv = serio->drv;
	int rc = -1;

	if (!drv || !psmouse) {
		printk(KERN_DEBUG "psmouse: reconnect request, but serio is disconnected, ignoring...\n");
		return -1;
	}

	if (serio->parent && (serio->type & SERIO_TYPE) == SERIO_PS_PSTHRU) {
		parent = serio->parent->private;
		psmouse_deactivate(parent);
	}

	psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);

	if (psmouse->reconnect) {
	       if (psmouse->reconnect(psmouse))
			goto out;
	} else if (psmouse_probe(psmouse) < 0 ||
		   psmouse->type != psmouse_extensions(psmouse, psmouse_max_proto, 0))
		goto out;

	/* ok, the device type (and capabilities) match the old one,
	 * we can continue using it, complete intialization
	 */
	psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);

	psmouse_initialize(psmouse);

	if (parent && parent->pt_activate)
		parent->pt_activate(parent);

	psmouse_activate(psmouse);
	rc = 0;

out:
	/* If this is a pass-through port the parent waits to be activated */
	if (parent)
		psmouse_activate(parent);

	return rc;
}


static struct serio_driver psmouse_drv = {
	.driver		= {
		.name	= "psmouse",
	},
	.description	= DRIVER_DESC,
	.interrupt	= psmouse_interrupt,
	.connect	= psmouse_connect,
	.reconnect	= psmouse_reconnect,
	.disconnect	= psmouse_disconnect,
	.cleanup	= psmouse_cleanup,
};

static inline void psmouse_parse_proto(void)
{
	if (psmouse_proto) {
		if (!strcmp(psmouse_proto, "bare"))
			psmouse_max_proto = PSMOUSE_PS2;
		else if (!strcmp(psmouse_proto, "imps"))
			psmouse_max_proto = PSMOUSE_IMPS;
		else if (!strcmp(psmouse_proto, "exps"))
			psmouse_max_proto = PSMOUSE_IMEX;
		else
			printk(KERN_ERR "psmouse: unknown protocol type '%s'\n", psmouse_proto);
	}
}

int __init psmouse_init(void)
{
	psmouse_parse_proto();
	serio_register_driver(&psmouse_drv);
	return 0;
}

void __exit psmouse_exit(void)
{
	serio_unregister_driver(&psmouse_drv);
}

module_init(psmouse_init);
module_exit(psmouse_exit);