psmouse-base.c

h内核

	ps2bare_detect(psmouse, set_properties);

	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);
		ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
	}

	return PSMOUSE_PS2;
}

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

static int psmouse_probe(struct psmouse *psmouse)
{
	struct ps2dev *ps2dev = &psmouse->ps2dev;
	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 (ps2_command(ps2dev, 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 (ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_DIS))
		printk(KERN_WARNING "psmouse.c: Failed to reset mouse on %s\n", ps2dev->serio->phys);

	return 0;
}

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

void psmouse_set_resolution(struct psmouse *psmouse, unsigned int resolution)
{
	unsigned char params[] = { 0, 1, 2, 2, 3 };

	if (resolution == 0 || resolution > 200)
		resolution = 200;

	ps2_command(&psmouse->ps2dev, &params[resolution / 50], PSMOUSE_CMD_SETRES);
	psmouse->resolution = 25 << params[resolution / 50];
}

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

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

	while (rates[i] > rate) i++;
	ps2_command(&psmouse->ps2dev, &rates[i], PSMOUSE_CMD_SETRATE);
	psmouse->rate = rates[i];
}

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

static void psmouse_initialize(struct psmouse *psmouse)
{
/*
 * We set the mouse into streaming mode.
 */

	ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSTREAM);

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

	if (psmouse_max_proto != PSMOUSE_PS2) {
		psmouse->set_rate(psmouse, psmouse->rate);
		psmouse->set_resolution(psmouse, psmouse->resolution);
		ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11);
	}
}

/*
 * 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->ps2dev.serio);
	psmouse->state = new_state;
	psmouse->pktcnt = psmouse->out_of_sync = 0;
	psmouse->ps2dev.flags = 0;
	serio_continue_rx(psmouse->ps2dev.serio);
}

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

static void psmouse_activate(struct psmouse *psmouse)
{
	if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE))
		printk(KERN_WARNING "psmouse.c: Failed to enable mouse on %s\n",
			psmouse->ps2dev.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 (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_DISABLE))
		printk(KERN_WARNING "psmouse.c: Failed to deactivate mouse on %s\n",
			psmouse->ps2dev.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;

	device_remove_file(&serio->dev, &psmouse_attr_rate);
	device_remove_file(&serio->dev, &psmouse_attr_resolution);
	device_remove_file(&serio->dev, &psmouse_attr_resetafter);

	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));

	ps2_init(&psmouse->ps2dev, serio);
	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->dev.private = psmouse;
	psmouse->dev.dev = &serio->dev;
	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->rate = psmouse_rate;
	psmouse->resolution = psmouse_resolution;
	psmouse->resetafter = psmouse_resetafter;
	psmouse->smartscroll = psmouse_smartscroll;
	psmouse->set_rate = psmouse_set_rate;
	psmouse->set_resolution = psmouse_set_resolution;
	psmouse->protocol_handler = psmouse_process_byte;
	psmouse->pktsize = 3;

	psmouse->type = psmouse_extensions(psmouse, psmouse_max_proto, 1);

	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);

	device_create_file(&serio->dev, &psmouse_attr_rate);
	device_create_file(&serio->dev, &psmouse_attr_resolution);
	device_create_file(&serio->dev, &psmouse_attr_resetafter);

	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,
};

ssize_t psmouse_attr_show_helper(struct device *dev, char *buf,
				 ssize_t (*handler)(struct psmouse *, char *))
{
	struct serio *serio = to_serio_port(dev);
	int retval;

	retval = serio_pin_driver(serio);
	if (retval)
		return retval;

	if (serio->drv != &psmouse_drv) {
		retval = -ENODEV;
		goto out;
	}

	retval = handler(serio->private, buf);

out:
	serio_unpin_driver(serio);
	return retval;
}

ssize_t psmouse_attr_set_helper(struct device *dev, const char *buf, size_t count,
				ssize_t (*handler)(struct psmouse *, const char *, size_t))
{
	struct serio *serio = to_serio_port(dev);
	struct psmouse *psmouse = serio->private, *parent = NULL;
	int retval;

	retval = serio_pin_driver(serio);
	if (retval)
		return retval;

	if (serio->drv != &psmouse_drv) {
		retval = -ENODEV;
		goto out;
	}

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

	retval = handler(psmouse, buf, count);

	psmouse_activate(psmouse);
	if (parent)
		psmouse_activate(parent);

out:
	serio_unpin_driver(serio);
	return retval;
}

static ssize_t psmouse_attr_show_rate(struct psmouse *psmouse, char *buf)
{
	return sprintf(buf, "%d\n", psmouse->rate);
}

static ssize_t psmouse_attr_set_rate(struct psmouse *psmouse, const char *buf, size_t count)
{
	unsigned long value;
	char *rest;

	value = simple_strtoul(buf, &rest, 10);
	if (*rest)
		return -EINVAL;

	psmouse->set_rate(psmouse, value);
	return count;
}

static ssize_t psmouse_attr_show_resolution(struct psmouse *psmouse, char *buf)
{
	return sprintf(buf, "%d\n", psmouse->resolution);
}

static ssize_t psmouse_attr_set_resolution(struct psmouse *psmouse, const char *buf, size_t count)
{
	unsigned long value;
	char *rest;

	value = simple_strtoul(buf, &rest, 10);
	if (*rest)
		return -EINVAL;

	psmouse->set_resolution(psmouse, value);
	return count;
}

static ssize_t psmouse_attr_show_resetafter(struct psmouse *psmouse, char *buf)
{
	return sprintf(buf, "%d\n", psmouse->resetafter);
}

static ssize_t psmouse_attr_set_resetafter(struct psmouse *psmouse, const char *buf, size_t count)
{
	unsigned long value;
	char *rest;

	value = simple_strtoul(buf, &rest, 10);
	if (*rest)
		return -EINVAL;

	psmouse->resetafter = value;
	return count;
}

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);