analog.c

优龙2410linux2.6.8内核源代码

	GET_TIME(t2);
	GET_TIME(t3);
	local_irq_restore(flags);

	port->speed = DELTA(t1, t2) - DELTA(t2, t3);

	tx = ~0;

	for (i = 0; i < 50; i++) {
		local_irq_save(flags);
		GET_TIME(t1);
		for (t = 0; t < 50; t++) { gameport_read(gameport); GET_TIME(t2); }
		GET_TIME(t3);
		local_irq_restore(flags);
		udelay(i);
		t = DELTA(t1, t2) - DELTA(t2, t3);
		if (t < tx) tx = t;
	}

        port->loop = tx / 50;
}

/*
 * analog_name() constructs a name for an analog joystick.
 */

static void analog_name(struct analog *analog)
{
	sprintf(analog->name, "Analog %d-axis %d-button",
		hweight8(analog->mask & ANALOG_AXES_STD),
		hweight8(analog->mask & ANALOG_BTNS_STD) + !!(analog->mask & ANALOG_BTNS_CHF) * 2 +
		hweight16(analog->mask & ANALOG_BTNS_GAMEPAD) + !!(analog->mask & ANALOG_HBTN_CHF) * 4);

	if (analog->mask & ANALOG_HATS_ALL)
		sprintf(analog->name, "%s %d-hat",
			analog->name, hweight16(analog->mask & ANALOG_HATS_ALL));

	if (analog->mask & ANALOG_HAT_FCS)
			strcat(analog->name, " FCS");
	if (analog->mask & ANALOG_ANY_CHF)
			strcat(analog->name, (analog->mask & ANALOG_SAITEK) ? " Saitek" : " CHF");

	strcat(analog->name, (analog->mask & ANALOG_GAMEPAD) ? " gamepad": " joystick");
}

/*
 * analog_init_device()
 */

static void analog_init_device(struct analog_port *port, struct analog *analog, int index)
{
	int i, j, t, v, w, x, y, z;

	analog_name(analog);
	sprintf(analog->phys, "%s/input%d", port->gameport->phys, index);
	analog->buttons = (analog->mask & ANALOG_GAMEPAD) ? analog_pad_btn : analog_joy_btn;

	init_input_dev(&analog->dev);

	analog->dev.name = analog->name;
	analog->dev.phys = analog->phys;
	analog->dev.id.bustype = BUS_GAMEPORT;
	analog->dev.id.vendor = GAMEPORT_ID_VENDOR_ANALOG;
	analog->dev.id.product = analog->mask >> 4;
	analog->dev.id.version = 0x0100;

	analog->dev.open = analog_open;
	analog->dev.close = analog_close;
	analog->dev.private = port;
	analog->dev.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);

	for (i = j = 0; i < 4; i++)
		if (analog->mask & (1 << i)) {

			t = analog_axes[j];
			x = port->axes[i];
			y = (port->axes[0] + port->axes[1]) >> 1;
			z = y - port->axes[i];
			z = z > 0 ? z : -z;
			v = (x >> 3);
			w = (x >> 3);

			set_bit(t, analog->dev.absbit);

			if ((i == 2 || i == 3) && (j == 2 || j == 3) && (z > (y >> 3)))
				x = y;

			if (analog->mask & ANALOG_SAITEK) {
				if (i == 2) x = port->axes[i];
				v = x - (x >> 2);
				w = (x >> 4);
			}

			analog->dev.absmax[t] = (x << 1) - v;
			analog->dev.absmin[t] = v;
			analog->dev.absfuzz[t] = port->fuzz;
			analog->dev.absflat[t] = w;

			j++;
		}

	for (i = j = 0; i < 3; i++)
		if (analog->mask & analog_exts[i])
			for (x = 0; x < 2; x++) {
				t = analog_hats[j++];
				set_bit(t, analog->dev.absbit);
				analog->dev.absmax[t] = 1;
				analog->dev.absmin[t] = -1;
			}

	for (i = j = 0; i < 4; i++)
		if (analog->mask & (0x10 << i))
			set_bit(analog->buttons[j++], analog->dev.keybit);

	if (analog->mask & ANALOG_BTNS_CHF)
		for (i = 0; i < 2; i++)
			set_bit(analog->buttons[j++], analog->dev.keybit);

	if (analog->mask & ANALOG_HBTN_CHF)
		for (i = 0; i < 4; i++)
			set_bit(analog->buttons[j++], analog->dev.keybit);

	for (i = 0; i < 4; i++)
		if (analog->mask & (ANALOG_BTN_TL << i))
			set_bit(analog_pads[i], analog->dev.keybit);

	analog_decode(analog, port->axes, port->initial, port->buttons);

	input_register_device(&analog->dev);

	printk(KERN_INFO "input: %s at %s", analog->name, port->gameport->phys);

	if (port->cooked)
		printk(" [ADC port]\n");
	else
		printk(" [%s timer, %d %sHz clock, %d ns res]\n", TIME_NAME,
		port->speed > 10000 ? (port->speed + 800) / 1000 : port->speed,
		port->speed > 10000 ? "M" : "k",
		port->speed > 10000 ? (port->loop * 1000) / (port->speed / 1000)
				    : (port->loop * 1000000) / port->speed);
}

/*
 * analog_init_devices() sets up device-specific values and registers the input devices.
 */

static int analog_init_masks(struct analog_port *port)
{
	int i;
	struct analog *analog = port->analog;
	int max[4];

	if (!port->mask)
		return -1;

	if ((port->mask & 3) != 3 && port->mask != 0xc) {
		printk(KERN_WARNING "analog.c: Unknown joystick device found  "
			"(data=%#x, %s), probably not analog joystick.\n",
			port->mask, port->gameport->phys);
		return -1;
	}


	i = analog_options[0]; /* FIXME !!! - need to specify options for different ports */

	analog[0].mask = i & 0xfffff;

	analog[0].mask &= ~(ANALOG_AXES_STD | ANALOG_HAT_FCS | ANALOG_BTNS_GAMEPAD)
			| port->mask | ((port->mask << 8) & ANALOG_HAT_FCS)
			| ((port->mask << 10) & ANALOG_BTNS_TLR) | ((port->mask << 12) & ANALOG_BTNS_TLR2);

	analog[0].mask &= ~(ANALOG_HAT2_CHF)
			| ((analog[0].mask & ANALOG_HBTN_CHF) ? 0 : ANALOG_HAT2_CHF);

	analog[0].mask &= ~(ANALOG_THROTTLE | ANALOG_BTN_TR | ANALOG_BTN_TR2)
			| ((~analog[0].mask & ANALOG_HAT_FCS) >> 8)
			| ((~analog[0].mask & ANALOG_HAT_FCS) << 2)
			| ((~analog[0].mask & ANALOG_HAT_FCS) << 4);

	analog[0].mask &= ~(ANALOG_THROTTLE | ANALOG_RUDDER)
			| (((~analog[0].mask & ANALOG_BTNS_TLR ) >> 10)
			&  ((~analog[0].mask & ANALOG_BTNS_TLR2) >> 12));

	analog[1].mask = ((i >> 20) & 0xff) | ((i >> 12) & 0xf0000);

	analog[1].mask &= (analog[0].mask & ANALOG_EXTENSIONS) ? ANALOG_GAMEPAD
			: (((ANALOG_BTNS_STD | port->mask) & ~analog[0].mask) | ANALOG_GAMEPAD);

	if (port->cooked) {

		for (i = 0; i < 4; i++) max[i] = port->axes[i] << 1;

		if ((analog[0].mask & 0x7) == 0x7) max[2] = (max[0] + max[1]) >> 1;
		if ((analog[0].mask & 0xb) == 0xb) max[3] = (max[0] + max[1]) >> 1;
		if ((analog[0].mask & ANALOG_BTN_TL) && !(analog[0].mask & ANALOG_BTN_TL2)) max[2] >>= 1;
		if ((analog[0].mask & ANALOG_BTN_TR) && !(analog[0].mask & ANALOG_BTN_TR2)) max[3] >>= 1;
		if ((analog[0].mask & ANALOG_HAT_FCS)) max[3] >>= 1;

		gameport_calibrate(port->gameport, port->axes, max);
	}

	for (i = 0; i < 4; i++)
		port->initial[i] = port->axes[i];

	return -!(analog[0].mask || analog[1].mask);
}

static int analog_init_port(struct gameport *gameport, struct gameport_dev *dev, struct analog_port *port)
{
	int i, t, u, v;

	gameport->private = port;
	port->gameport = gameport;
	init_timer(&port->timer);
	port->timer.data = (long) port;
	port->timer.function = analog_timer;

	if (!gameport_open(gameport, dev, GAMEPORT_MODE_RAW)) {

		analog_calibrate_timer(port);

		gameport_trigger(gameport);
		t = gameport_read(gameport);
		msleep(ANALOG_MAX_TIME);
		port->mask = (gameport_read(gameport) ^ t) & t & 0xf;
		port->fuzz = (port->speed * ANALOG_FUZZ_MAGIC) / port->loop / 1000 + ANALOG_FUZZ_BITS;

		for (i = 0; i < ANALOG_INIT_RETRIES; i++) {
			if (!analog_cooked_read(port)) break;
			msleep(ANALOG_MAX_TIME);
		}

		u = v = 0;

		msleep(ANALOG_MAX_TIME);
		t = gameport_time(gameport, ANALOG_MAX_TIME * 1000);
		gameport_trigger(gameport);
		while ((gameport_read(port->gameport) & port->mask) && (u < t)) u++;
		udelay(ANALOG_SAITEK_DELAY);
		t = gameport_time(gameport, ANALOG_SAITEK_TIME);
		gameport_trigger(gameport);
		while ((gameport_read(port->gameport) & port->mask) && (v < t)) v++;

		if (v < (u >> 1)) { /* FIXME - more than one port */
			analog_options[0] |= /* FIXME - more than one port */
				ANALOG_SAITEK | ANALOG_BTNS_CHF | ANALOG_HBTN_CHF | ANALOG_HAT1_CHF;
			return 0;
		}

		gameport_close(gameport);
	}

	if (!gameport_open(gameport, dev, GAMEPORT_MODE_COOKED)) {

		for (i = 0; i < ANALOG_INIT_RETRIES; i++)
			if (!gameport_cooked_read(gameport, port->axes, &port->buttons))
				break;
		for (i = 0; i < 4; i++)
			if (port->axes[i] != -1) port->mask |= 1 << i;

		port->fuzz = gameport->fuzz;
		port->cooked = 1;
		return 0;
	}

	if (!gameport_open(gameport, dev, GAMEPORT_MODE_RAW))
		return 0;

	return -1;
}

static void analog_connect(struct gameport *gameport, struct gameport_dev *dev)
{
	struct analog_port *port;
	int i;

	if (!(port = kmalloc(sizeof(struct analog_port), GFP_KERNEL)))
		return;
	memset(port, 0, sizeof(struct analog_port));

	if (analog_init_port(gameport, dev, port)) {
		kfree(port);
		return;
	}

	if (analog_init_masks(port)) {
		gameport_close(gameport);
		kfree(port);
		return;
	}

	for (i = 0; i < 2; i++)
		if (port->analog[i].mask)
			analog_init_device(port, port->analog + i, i);
}

static void analog_disconnect(struct gameport *gameport)
{
	int i;

	struct analog_port *port = gameport->private;
	for (i = 0; i < 2; i++)
		if (port->analog[i].mask)
			input_unregister_device(&port->analog[i].dev);
	gameport_close(gameport);
	printk(KERN_INFO "analog.c: %d out of %d reads (%d%%) on %s failed\n",
		port->bads, port->reads, port->reads ? (port->bads * 100 / port->reads) : 0,
		port->gameport->phys);
	kfree(port);
}

struct analog_types {
	char *name;
	int value;
};

struct analog_types analog_types[] = {
	{ "none",	0x00000000 },
	{ "auto",	0x000000ff },
	{ "2btn",	0x0000003f },
	{ "y-joy",	0x0cc00033 },
	{ "y-pad",	0x8cc80033 },
	{ "fcs",	0x000008f7 },
	{ "chf",	0x000002ff },
	{ "fullchf",	0x000007ff },
	{ "gamepad",	0x000830f3 },
	{ "gamepad8",	0x0008f0f3 },
	{ NULL, 0 }
};

static void analog_parse_options(void)
{
	int i, j;
	char *end;

	for (i = 0; i < js_nargs; i++) {

		for (j = 0; analog_types[j].name; j++)
			if (!strcmp(analog_types[j].name, js[i])) {
				analog_options[i] = analog_types[j].value;
				break;
			}
		if (analog_types[j].name) continue;

		analog_options[i] = simple_strtoul(js[i], &end, 0);
		if (end != js[i]) continue;

		analog_options[i] = 0xff;
		if (!strlen(js[i])) continue;

		printk(KERN_WARNING "analog.c: Bad config for port %d - \"%s\"\n", i, js[i]);
	}

	for (; i < ANALOG_PORTS; i++)
		analog_options[i] = 0xff;
}

/*
 * The gameport device structure.
 */

static struct gameport_dev analog_dev = {
	.connect =	analog_connect,
	.disconnect =	analog_disconnect,
};

int __init analog_init(void)
{
	analog_parse_options();
	gameport_register_device(&analog_dev);
	return 0;
}

void __exit analog_exit(void)
{
	gameport_unregister_device(&analog_dev);
}

module_init(analog_init);
module_exit(analog_exit);