HID: pidff: Update debug messages

Signed-off-by: Tomasz Pakuła <tomasz.pakula.oficjalny@gmail.com>

Better indicate what operation is requested on a given effect (play or
stop). Previously, we only had the info about requesting playback but
this could be misleading when the looop count is 0.

Add debug print that shows what device control command was actually sent
to the device. Print out its hex hid usage.

Make field_index const to make sure it won't be changed by mistake later.

Signed-off-by: Jiri Kosina <jkosina@suse.com>

Author: Lawstorant

drivers/hid/usbhid/hid-pidff.c

@@ -623,8 +623,7 @@ static void pidff_set_gain_report(struct pidff_device *pidff, u16 gain)
  */
 static void pidff_set_device_control(struct pidff_device *pidff, int field)
 {
-	int i, index;
-	int field_index = pidff->control_id[field];
+	const int field_index = pidff->control_id[field];
 
 	if (field_index < 1)
 		return;
@@ -634,8 +633,9 @@ static void pidff_set_device_control(struct pidff_device *pidff, int field)
 		hid_dbg(pidff->hid, "DEVICE_CONTROL is a bitmask\n");
 
 		/* Clear current bitmask */
-		for (i = 0; i < ARRAY_SIZE(pidff_device_control); i++) {
-			index = pidff->control_id[i];
+		for (int i = 0; i < ARRAY_SIZE(pidff_device_control); i++) {
+			int index = pidff->control_id[i];
+
 			if (index < 1)
 				continue;
 
@@ -650,6 +650,8 @@ static void pidff_set_device_control(struct pidff_device *pidff, int field)
 
 	hid_hw_request(pidff->hid, pidff->reports[PID_DEVICE_CONTROL], HID_REQ_SET_REPORT);
 	hid_hw_wait(pidff->hid);
+	hid_dbg(pidff->hid, "Device control command 0x%02x sent",
+		pidff_device_control[field]);
 }
 
 /*
@@ -751,6 +753,9 @@ static void pidff_playback_pid(struct pidff_device *pidff, int pid_id, int n)
 {
 	pidff->effect_operation[PID_EFFECT_BLOCK_INDEX].value[0] = pid_id;
 
+	hid_dbg(pidff->hid, "%s PID effect %d", n == 0 ? "stopping" : "playing",
+		pid_id);
+
 	if (n == 0) {
 		pidff->effect_operation_status->value[0] =
 			pidff->operation_id[PID_EFFECT_STOP];
@@ -772,6 +777,8 @@ static int pidff_playback(struct input_dev *dev, int effect_id, int value)
 {
 	struct pidff_device *pidff = dev->ff->private;
 
+	hid_dbg(pidff->hid, "requesting %s on FF effect %d",
+		value == 0 ? "stop" : "playback", effect_id);
 	pidff_playback_pid(pidff, pidff->pid_id[effect_id], value);
 	return 0;
 }