From e8f46e4f93f52b2bcc681cf8bc3ff84a22a2d356 Mon Sep 17 00:00:00 2001
From: Jim Keir <jimkeir@oracledbadirect.com>
Date: Thu, 26 Feb 2015 09:14:03 +0000
Subject: HID: pidff: support more than one concurrent effect
The PID driver (usbhid/hid-pidff.c) does not set the effect ID when
uploading an effect. The result is that the initial upload works but
subsequent uploads to modify effect parameters are all directed at the
last-created effect.
The targeted effect ID must be passed back to the device when effect
parameters are changed. This is done at the start of
"pidff_set_condition_report", "pidff_set_periodic_report" etc. based on
the value of "pidff->block_load[PID_EFFECT_
BLOCK_INDEX].value[0]".
This value is only ever set during pidff_request_effect_upload.
The result is stored in "pidff->pid_id[effect->id]" at the end of
pid_upload_effect, for later use. However, if an effect is modified and
re-sent then this identifier is not being copied back from
pidff->pid_id[effect->id] before sending the command to the device. The
fix is to do this at the start of pidff_upload_effect.
Signed-off-by: Jim Keir <jimkeir@oracledbadirect.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
drivers/hid/usbhid/hid-pidff.c | 6 ++++++
1 file changed, 6 insertions(+)
(limited to 'drivers/hid')
diff --git a/drivers/hid/usbhid/hid-pidff.c b/drivers/hid/usbhid/hid-pidff.c
index 0b531c6a76a5..1b3fa70bd5ff 100644
--- a/drivers/hid/usbhid/hid-pidff.c
+++ b/drivers/hid/usbhid/hid-pidff.c
@@ -568,6 +568,12 @@ static int pidff_upload_effect(struct input_dev *dev, struct ff_effect *effect,
int type_id;
int error;
+ pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0] = 0;
+ if (old && effect) {
+ pidff->block_load[PID_EFFECT_BLOCK_INDEX].value[0] =
+ pidff->pid_id[effect->id];
+ }
+
switch (effect->type) {
case FF_CONSTANT:
if (!old) {
--
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