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Commit a8a09c85 authored by Jason Gerecke's avatar Jason Gerecke Committed by Jiri Kosina
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HID: wacom: Replace magic masks and comparisons with switch cases 



Reasoning through the conditions under which a particular block of code
in 'wacom_intuos_general' will be reached is not at all easy due to the
sheer number of magic masks and comparisons. Remove these and replace
them with a switch statement over the various 'types' of packets that
will be encountered.

Signed-off-by: default avatarJason Gerecke <jason.gerecke@wacom.com>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent 16e0a6a0

drivers/hid/wacom_wac.c

+49 −30
Original line number Diff line number Diff line
@@ -886,6 +886,7 @@ static int wacom_intuos_general(struct wacom_wac *wacom) 
	unsigned char *data = wacom->data;

	struct input_dev *input = wacom->pen_input;

	int idx = (features->type == INTUOS) ? (data[1] & 0x01) : 0;

	unsigned char type = (data[1] >> 1) & 0x0F;

	unsigned int t;



	if (data[0] != WACOM_REPORT_PENABLED && data[0] != WACOM_REPORT_CINTIQ &&
@@ -902,8 +903,12 @@ static int wacom_intuos_general(struct wacom_wac *wacom) 
		input_report_abs(input, ABS_DISTANCE, ((data[9] >> 3) & 0x1f));

	}



	switch (type) {

	case 0x00:

	case 0x01:

	case 0x02:

	case 0x03:

		/* general pen packet */

	if ((data[1] & 0xb8) == 0xa0) {

		t = (data[6] << 2) | ((data[7] >> 6) & 3);

		if (features->pressure_max == 2047) {

			t = (t << 1) | (data[1] & 1);
@@ -917,21 +922,20 @@ static int wacom_intuos_general(struct wacom_wac *wacom) 
		input_report_key(input, BTN_STYLUS, data[1] & 2);

		input_report_key(input, BTN_STYLUS2, data[1] & 4);

		input_report_key(input, BTN_TOUCH, t > 10);

	}

		break;



	case 0x0a:

	case 0x0b:

		/* airbrush second packet */

	if ((data[1] & 0xbc) == 0xb4) {

		input_report_abs(input, ABS_WHEEL,

				(data[6] << 2) | ((data[7] >> 6) & 3));

		input_report_abs(input, ABS_TILT_X,

				 (((data[7] << 1) & 0x7e) | (data[8] >> 7)) - 64);

		input_report_abs(input, ABS_TILT_Y, (data[8] & 0x7f) - 64);

	}



	/* 4D mouse, 2D mouse, marker pen rotation, tilt mouse, or Lens cursor packets */

	if ((data[1] & 0xbc) == 0xa8 || (data[1] & 0xbe) == 0xb0 || (data[1] & 0xbc) == 0xac) {

		break;



		if (data[1] & 0x02) {

	case 0x05:

	case 0x07:

		/* Rotation packet */

		if (features->type >= INTUOS3S) {

			/* I3 marker pen rotation */
@@ -945,8 +949,13 @@ static int wacom_intuos_general(struct wacom_wac *wacom) 
			input_report_abs(input, ABS_RZ, (data[7] & 0x20) ?

				((t - 1) / 2) : -t / 2);

		}

		break;



		} else if (!(data[1] & 0x10) && features->type < INTUOS3S) {

	/* 4D mouse, 2D mouse, marker pen rotation, tilt mouse, or Lens cursor packets */

	case 0x04:

	case 0x06:

	case 0x08:

		if (features->type < INTUOS3S && type != 0x08) {

			/* 4D mouse packet */

			input_report_key(input, BTN_LEFT,   data[8] & 0x01);

			input_report_key(input, BTN_MIDDLE, data[8] & 0x02);
@@ -956,8 +965,8 @@ static int wacom_intuos_general(struct wacom_wac *wacom) 
			input_report_key(input, BTN_EXTRA,  data[8] & 0x10);

			t = (data[6] << 2) | ((data[7] >> 6) & 3);

			input_report_abs(input, ABS_THROTTLE, (data[8] & 0x08) ? -t : t);



		} else if (wacom->tool[idx] == BTN_TOOL_MOUSE) {

		}

		else if (wacom->tool[idx] == BTN_TOOL_MOUSE) {

			/* I4 mouse */

			if (features->type >= INTUOS4S && features->type <= INTUOSPL) {

				input_report_key(input, BTN_LEFT,   data[6] & 0x01);
@@ -985,7 +994,8 @@ static int wacom_intuos_general(struct wacom_wac *wacom) 
					input_report_key(input, BTN_EXTRA,  data[8] & 0x20);

				}

			}

		} else if ((features->type < INTUOS3S || features->type == INTUOS3L ||

		}

		else if ((features->type < INTUOS3S || features->type == INTUOS3L ||

		          features->type == INTUOS4L || features->type == INTUOS5L ||

		          features->type == INTUOSPL) &&

		         wacom->tool[idx] == BTN_TOOL_LENS) {
@@ -996,6 +1006,15 @@ static int wacom_intuos_general(struct wacom_wac *wacom) 
			input_report_key(input, BTN_SIDE,   data[8] & 0x10);

			input_report_key(input, BTN_EXTRA,  data[8] & 0x08);

		}

		break;



	case 0x09:

	case 0x0c:

	case 0x0d:

	case 0x0e:

	case 0x0f:

		/* unhandled */

		break;

	}



	input_report_abs(input, ABS_MISC, wacom->id[idx]); /* report tool id */