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Date: Thu, 24 Aug 2017 16:09:55 -0700
From: Dmitry Torokhov <dmitry.torokhov@...il.com>
To: Takashi Iwai <tiwai@...e.de>
Cc: Pali Rohár <pali.rohar@...il.com>,
Masaki Ota <masaki.ota@...alps.com>,
Paul Donohue <linux-kernel@...lSD.com>,
linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND] Input: ALPS - Fix two-finger scroll breakage in
right side on ALPS touchpad
Hi Takashi,
On Tue, Aug 22, 2017 at 10:17:00PM +0200, Takashi Iwai wrote:
> From: Masaki Ota <masaki.ota@...alps.com>
>
> Fixed the issue that two finger scroll does not work correctly
> on V8 protocol. The cause is that V8 protocol X-coordinate decode
> is wrong at SS4 PLUS device. I added SS4 PLUS X decode definition.
>
> Mote notes:
> the problem manifests itself by the commit e7348396c6d5 ("Input: ALPS
> - fix V8+ protocol handling (73 03 28)"), where a fix for the V8+
> protocol was applied. Although the culprit must have been present
> beforehand, the two-finger scroll worked casually even with the
> wrongly reported values by some reason. It got broken by the commit
> above just because it changed x_max value, and this made libinput
> correctly figuring the MT events. Since the X coord is reported as
> falsely doubled, the events on the right-half side go outside the
> boundary, thus they are no longer handled. This resulted as a broken
> two-finger scroll.
>
> One finger event is decoded differently, and it didn't suffer from
> this problem. The problem was only about MT events. --tiwai
>
> Fixes: e7348396c6d5 ("Input: ALPS - fix V8+ protocol handling (73 03 28)")
> Signed-off-by: Masaki Ota <masaki.ota@...alps.com>
> Tested-by: Takashi Iwai <tiwai@...e.de>
> Tested-by: Paul Donohue <linux-kernel@...lSD.com>
> Cc: <stable@...r.kernel.org>
> Signed-off-by: Takashi Iwai <tiwai@...e.de>
> ---
>
> Dmitry, I resend this patch from Ota-san, as the previous thread was
> cursed. Since this is an annoying regression in the recent kernels,
> could you apply this? Thanks!
Sorry I checked out on this patch for a bit. It is now applied and I
will send it Linuswards in the next day or two.
Thanks!
>
>
> drivers/input/mouse/alps.c | 41 +++++++++++++++++++++++++++++++----------
> drivers/input/mouse/alps.h | 8 ++++++++
> 2 files changed, 39 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/input/mouse/alps.c b/drivers/input/mouse/alps.c
> index 262d1057c1da..850b00e3ad8e 100644
> --- a/drivers/input/mouse/alps.c
> +++ b/drivers/input/mouse/alps.c
> @@ -1215,14 +1215,24 @@ static int alps_decode_ss4_v2(struct alps_fields *f,
>
> case SS4_PACKET_ID_TWO:
> if (priv->flags & ALPS_BUTTONPAD) {
> - f->mt[0].x = SS4_BTL_MF_X_V2(p, 0);
> + if (IS_SS4PLUS_DEV(priv->dev_id)) {
> + f->mt[0].x = SS4_PLUS_BTL_MF_X_V2(p, 0);
> + f->mt[1].x = SS4_PLUS_BTL_MF_X_V2(p, 1);
> + } else {
> + f->mt[0].x = SS4_BTL_MF_X_V2(p, 0);
> + f->mt[1].x = SS4_BTL_MF_X_V2(p, 1);
> + }
> f->mt[0].y = SS4_BTL_MF_Y_V2(p, 0);
> - f->mt[1].x = SS4_BTL_MF_X_V2(p, 1);
> f->mt[1].y = SS4_BTL_MF_Y_V2(p, 1);
> } else {
> - f->mt[0].x = SS4_STD_MF_X_V2(p, 0);
> + if (IS_SS4PLUS_DEV(priv->dev_id)) {
> + f->mt[0].x = SS4_PLUS_STD_MF_X_V2(p, 0);
> + f->mt[1].x = SS4_PLUS_STD_MF_X_V2(p, 1);
> + } else {
> + f->mt[0].x = SS4_STD_MF_X_V2(p, 0);
> + f->mt[1].x = SS4_STD_MF_X_V2(p, 1);
> + }
> f->mt[0].y = SS4_STD_MF_Y_V2(p, 0);
> - f->mt[1].x = SS4_STD_MF_X_V2(p, 1);
> f->mt[1].y = SS4_STD_MF_Y_V2(p, 1);
> }
> f->pressure = SS4_MF_Z_V2(p, 0) ? 0x30 : 0;
> @@ -1239,16 +1249,27 @@ static int alps_decode_ss4_v2(struct alps_fields *f,
>
> case SS4_PACKET_ID_MULTI:
> if (priv->flags & ALPS_BUTTONPAD) {
> - f->mt[2].x = SS4_BTL_MF_X_V2(p, 0);
> + if (IS_SS4PLUS_DEV(priv->dev_id)) {
> + f->mt[0].x = SS4_PLUS_BTL_MF_X_V2(p, 0);
> + f->mt[1].x = SS4_PLUS_BTL_MF_X_V2(p, 1);
> + } else {
> + f->mt[2].x = SS4_BTL_MF_X_V2(p, 0);
> + f->mt[3].x = SS4_BTL_MF_X_V2(p, 1);
> + }
> +
> f->mt[2].y = SS4_BTL_MF_Y_V2(p, 0);
> - f->mt[3].x = SS4_BTL_MF_X_V2(p, 1);
> f->mt[3].y = SS4_BTL_MF_Y_V2(p, 1);
> no_data_x = SS4_MFPACKET_NO_AX_BL;
> no_data_y = SS4_MFPACKET_NO_AY_BL;
> } else {
> - f->mt[2].x = SS4_STD_MF_X_V2(p, 0);
> + if (IS_SS4PLUS_DEV(priv->dev_id)) {
> + f->mt[0].x = SS4_PLUS_STD_MF_X_V2(p, 0);
> + f->mt[1].x = SS4_PLUS_STD_MF_X_V2(p, 1);
> + } else {
> + f->mt[0].x = SS4_STD_MF_X_V2(p, 0);
> + f->mt[1].x = SS4_STD_MF_X_V2(p, 1);
> + }
> f->mt[2].y = SS4_STD_MF_Y_V2(p, 0);
> - f->mt[3].x = SS4_STD_MF_X_V2(p, 1);
> f->mt[3].y = SS4_STD_MF_Y_V2(p, 1);
> no_data_x = SS4_MFPACKET_NO_AX;
> no_data_y = SS4_MFPACKET_NO_AY;
> @@ -2541,8 +2562,8 @@ static int alps_set_defaults_ss4_v2(struct psmouse *psmouse,
>
> memset(otp, 0, sizeof(otp));
>
> - if (alps_get_otp_values_ss4_v2(psmouse, 0, &otp[0][0]) ||
> - alps_get_otp_values_ss4_v2(psmouse, 1, &otp[1][0]))
> + if (alps_get_otp_values_ss4_v2(psmouse, 1, &otp[1][0]) ||
> + alps_get_otp_values_ss4_v2(psmouse, 0, &otp[0][0]))
> return -1;
>
> alps_update_device_area_ss4_v2(otp, priv);
> diff --git a/drivers/input/mouse/alps.h b/drivers/input/mouse/alps.h
> index ed2d6879fa52..c80a7c76cb76 100644
> --- a/drivers/input/mouse/alps.h
> +++ b/drivers/input/mouse/alps.h
> @@ -100,6 +100,10 @@ enum SS4_PACKET_ID {
> ((_b[1 + _i * 3] << 5) & 0x1F00) \
> )
>
> +#define SS4_PLUS_STD_MF_X_V2(_b, _i) (((_b[0 + (_i) * 3] << 4) & 0x0070) | \
> + ((_b[1 + (_i) * 3] << 4) & 0x0F80) \
> + )
> +
> #define SS4_STD_MF_Y_V2(_b, _i) (((_b[1 + (_i) * 3] << 3) & 0x0010) | \
> ((_b[2 + (_i) * 3] << 5) & 0x01E0) | \
> ((_b[2 + (_i) * 3] << 4) & 0x0E00) \
> @@ -109,6 +113,10 @@ enum SS4_PACKET_ID {
> ((_b[0 + (_i) * 3] >> 3) & 0x0010) \
> )
>
> +#define SS4_PLUS_BTL_MF_X_V2(_b, _i) (SS4_PLUS_STD_MF_X_V2(_b, _i) | \
> + ((_b[0 + (_i) * 3] >> 4) & 0x0008) \
> + )
> +
> #define SS4_BTL_MF_Y_V2(_b, _i) (SS4_STD_MF_Y_V2(_b, _i) | \
> ((_b[0 + (_i) * 3] >> 3) & 0x0008) \
> )
> --
> 2.14.0
>
--
Dmitry
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