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authorJason Gerecke <killertofu@gmail.com>2015-08-03 10:18:10 -0700
committerJiri Kosina <jkosina@suse.cz>2015-08-11 01:03:48 +0200
commit025bcc154027fc52b1aee192c4599bb6ee6a3c9c (patch)
treec308e3921cde5ef2c45048358cc479c969fd3bc1 /drivers/hid/wacom_wac.c
parent64d0ed94f5dfde5efac15941128f60edf7f15c17 (diff)
downloadlinux-025bcc154027fc52b1aee192c4599bb6ee6a3c9c.tar.bz2
HID: wacom: Simplify 'wacom_pl_irq'
Unlike other IRQ functions, 'wacom_pl_irq' uses the second element of the 'tool' array to store information about its single pen. This makes the function more difficult to understand (since it doesn't follow the general pattern of other IRQ functions) and prevents the possibility of refactoring how pen state is stored. This patch rewrites 'wacom_pl_irq' to follow the usual IRQ conventions, including storing tool type in 'tool[0]' and implicitly tracking prox with the 'id[0]' variable. Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/wacom_wac.c')
-rw-r--r--drivers/hid/wacom_wac.c84
1 files changed, 35 insertions, 49 deletions
diff --git a/drivers/hid/wacom_wac.c b/drivers/hid/wacom_wac.c
index 4d11c7857e70..fe164dfc8a7c 100644
--- a/drivers/hid/wacom_wac.c
+++ b/drivers/hid/wacom_wac.c
@@ -125,61 +125,47 @@ static int wacom_pl_irq(struct wacom_wac *wacom)
prox = data[1] & 0x40;
- if (prox) {
- wacom->id[0] = ERASER_DEVICE_ID;
- pressure = (signed char)((data[7] << 1) | ((data[4] >> 2) & 1));
- if (features->pressure_max > 255)
- pressure = (pressure << 1) | ((data[4] >> 6) & 1);
- pressure += (features->pressure_max + 1) / 2;
-
- /*
- * if going from out of proximity into proximity select between the eraser
- * and the pen based on the state of the stylus2 button, choose eraser if
- * pressed else choose pen. if not a proximity change from out to in, send
- * an out of proximity for previous tool then a in for new tool.
- */
- if (!wacom->tool[0]) {
- /* Eraser bit set for DTF */
- if (data[1] & 0x10)
- wacom->tool[1] = BTN_TOOL_RUBBER;
- else
- /* Going into proximity select tool */
- wacom->tool[1] = (data[4] & 0x20) ? BTN_TOOL_RUBBER : BTN_TOOL_PEN;
- } else {
- /* was entered with stylus2 pressed */
- if (wacom->tool[1] == BTN_TOOL_RUBBER && !(data[4] & 0x20)) {
- /* report out proximity for previous tool */
- input_report_key(input, wacom->tool[1], 0);
- input_sync(input);
- wacom->tool[1] = BTN_TOOL_PEN;
- return 0;
- }
+ if (!wacom->id[0]) {
+ if ((data[0] & 0x10) || (data[4] & 0x20)) {
+ wacom->tool[0] = BTN_TOOL_RUBBER;
+ wacom->id[0] = ERASER_DEVICE_ID;
}
- if (wacom->tool[1] != BTN_TOOL_RUBBER) {
- /* Unknown tool selected default to pen tool */
- wacom->tool[1] = BTN_TOOL_PEN;
+ else {
+ wacom->tool[0] = BTN_TOOL_PEN;
wacom->id[0] = STYLUS_DEVICE_ID;
}
- input_report_key(input, wacom->tool[1], prox); /* report in proximity for tool */
- input_report_abs(input, ABS_MISC, wacom->id[0]); /* report tool id */
- input_report_abs(input, ABS_X, data[3] | (data[2] << 7) | ((data[1] & 0x03) << 14));
- input_report_abs(input, ABS_Y, data[6] | (data[5] << 7) | ((data[4] & 0x03) << 14));
- input_report_abs(input, ABS_PRESSURE, pressure);
+ }
- input_report_key(input, BTN_TOUCH, data[4] & 0x08);
- input_report_key(input, BTN_STYLUS, data[4] & 0x10);
- /* Only allow the stylus2 button to be reported for the pen tool. */
- input_report_key(input, BTN_STYLUS2, (wacom->tool[1] == BTN_TOOL_PEN) && (data[4] & 0x20));
- } else {
- /* report proximity-out of a (valid) tool */
- if (wacom->tool[1] != BTN_TOOL_RUBBER) {
- /* Unknown tool selected default to pen tool */
- wacom->tool[1] = BTN_TOOL_PEN;
- }
- input_report_key(input, wacom->tool[1], prox);
+ /* If the eraser is in prox, STYLUS2 is always set. If we
+ * mis-detected the type and notice that STYLUS2 isn't set
+ * then force the eraser out of prox and let the pen in.
+ */
+ if (wacom->tool[0] == BTN_TOOL_RUBBER && !(data[4] & 0x20)) {
+ input_report_key(input, BTN_TOOL_RUBBER, 0);
+ input_report_abs(input, ABS_MISC, 0);
+ input_sync(input);
+ wacom->tool[0] = BTN_TOOL_PEN;
+ wacom->id[0] = STYLUS_DEVICE_ID;
}
- wacom->tool[0] = prox; /* Save proximity state */
+ pressure = (signed char)((data[7] << 1) | ((data[4] >> 2) & 1));
+ if (features->pressure_max > 255)
+ pressure = (pressure << 1) | ((data[4] >> 6) & 1);
+ pressure += (features->pressure_max + 1) / 2;
+
+ input_report_abs(input, ABS_X, data[3] | (data[2] << 7) | ((data[1] & 0x03) << 14));
+ input_report_abs(input, ABS_Y, data[6] | (data[5] << 7) | ((data[4] & 0x03) << 14));
+ input_report_abs(input, ABS_PRESSURE, pressure);
+
+ input_report_key(input, BTN_TOUCH, data[4] & 0x08);
+ input_report_key(input, BTN_STYLUS, data[4] & 0x10);
+ /* Only allow the stylus2 button to be reported for the pen tool. */
+ input_report_key(input, BTN_STYLUS2, (wacom->tool[0] == BTN_TOOL_PEN) && (data[4] & 0x20));
+
+ if (!prox)
+ wacom->id[0] = 0;
+ input_report_key(input, wacom->tool[0], prox);
+ input_report_abs(input, ABS_MISC, wacom->id[0]);
return 1;
}