Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753678Ab0HWOMB (ORCPT ); Mon, 23 Aug 2010 10:12:01 -0400 Received: from mail-wy0-f174.google.com ([74.125.82.174]:63808 "EHLO mail-wy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752708Ab0HWOL6 convert rfc822-to-8bit (ORCPT ); Mon, 23 Aug 2010 10:11:58 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=m10fAPp57WCU6y0QI/Ec88XWihSXE2I76p/Mqstf9lvXrHgA77HKqZSjQPCrVXsDYL xheNwmOZzL2UQ/KifNrqlZqqk2o65X/Q/H6lHikpXGrUYhPNk10lO8iPbASBzzleoR+9 nHrIHhZO673hQ70o2LC6MnMGprmxotsB1dnpg= MIME-Version: 1.0 In-Reply-To: <4C722ECF.5020706@euromail.se> References: <1282280135-15942-1-git-send-email-peter.hutterer@who-t.net> <1282280135-15942-4-git-send-email-peter.hutterer@who-t.net> <4C722ECF.5020706@euromail.se> Date: Mon, 23 Aug 2010 16:11:56 +0200 Message-ID: Subject: Re: [PATCH 3/3] input: add multitouch slot support to w8001. From: Ping Cheng To: Henrik Rydberg Cc: Peter Hutterer , linux-input@vger.kernel.org, linux-kernel@vger.kernel.org Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 7434 Lines: 218 On Mon, Aug 23, 2010 at 10:18 AM, Henrik Rydberg wrote: > Hi Peter, > > thanks for the patches. Comments inline. > >> Some serial wacom devices support two-finger touch. Test for this during > >> init and parse the touch packets accordingly. Touch packets are >> processed using Protocol B (MT Slots). >> >> Note: there are several wacom versions that do touch but not two-finger >> touch. These are not catered for here, touch events for these are simply >> discarded. >> >> Signed-off-by: Peter Hutterer >> CC: Henrik Rydberg >> --- >> ?drivers/input/touchscreen/wacom_w8001.c | ? 99 ++++++++++++++++++++++++++++++- >> ?1 files changed, 96 insertions(+), 3 deletions(-) >> >> diff --git a/drivers/input/touchscreen/wacom_w8001.c b/drivers/input/touchscreen/wacom_w8001.c >> index c302cc3..a38a3aa 100644 >> --- a/drivers/input/touchscreen/wacom_w8001.c >> +++ b/drivers/input/touchscreen/wacom_w8001.c >> @@ -60,6 +60,17 @@ struct w8001_coord { >> ? ? ? u8 tilt_y; >> ?}; >> >> +/* touch data packet */ >> +struct w8001_touch { >> + ? ? u8 f1_status; >> + ? ? u16 f1_x; >> + ? ? u16 f1_y; >> + ? ? /* only some tablets have 2FG info */ >> + ? ? u8 f2_status; >> + ? ? u16 f2_x; >> + ? ? u16 f2_y; >> +}; > > > No pressure information from this device? No useful pressure/capacity available for this device. > >> + >> ?/* touch query reply packet */ >> ?struct w8001_touch_query { >> ? ? ? u8 panel_res; >> @@ -85,8 +96,18 @@ struct w8001 { >> ? ? ? char phys[32]; >> ? ? ? int type; >> ? ? ? unsigned int pktlen; >> + ? ? unsigned char tracking_id[2]; >> ?}; >> >> +static int get_next_tracking_id(void) >> +{ >> + ? ? static unsigned char next_tracking_id; >> + ? ? next_tracking_id = (next_tracking_id + 1) % 256; >> + ? ? if (next_tracking_id == 0) >> + ? ? ? ? ? ? next_tracking_id = 1; >> + ? ? return next_tracking_id; >> +} > > > Zero is part of the valid range from 2.6.36. Can be implemented simply as > (tracking_id++ & 0xfff), see recent MT slots patches. > >> + >> ?static void parse_data(u8 *data, struct w8001_coord *coord) >> ?{ >> ? ? ? memset(coord, 0, sizeof(*coord)); >> @@ -111,6 +132,26 @@ static void parse_data(u8 *data, struct w8001_coord *coord) >> ? ? ? coord->tilt_y = data[8] & 0x7F; >> ?} >> >> +static void parse_touch(u8 *data, >> + ? ? ? ? ? ? ? ? ? ? unsigned int pktlen, struct w8001_touch *touch) >> +{ >> + ? ? memset(touch, 0, sizeof(*touch)); >> + >> + ? ? touch->f1_status = data[0] & 0x1; >> + ? ? touch->f1_x = data[1] << 7; >> + ? ? touch->f1_x |= data[2]; >> + ? ? touch->f1_y = data[3] << 7; >> + ? ? touch->f1_y |= data[4]; > > > What are data[5] and data[6]? Why is f1_x/y split into several lines? > >> + >> + ? ? if (pktlen >= W8001_PKTLEN_TOUCH2FG) { >> + ? ? ? ? ? ? touch->f2_status = (data[0] & 0x2) >> 1; >> + ? ? ? ? ? ? touch->f2_x = data[7] << 7; >> + ? ? ? ? ? ? touch->f2_x |= data[8]; >> + ? ? ? ? ? ? touch->f2_y = data[9] << 7; >> + ? ? ? ? ? ? touch->f2_y |= data[10]; >> + ? ? } > > > What are data[11] and data[12]? > > Since all needed information is available here, there seems to be little reason > for the w8001_touch structure. Why not complete the report in this function? > >> +} >> + >> ?static void parse_touchquery(u8 *data, struct w8001_touch_query *query) >> ?{ >> ? ? ? memset(query, 0, sizeof(*query)); >> @@ -128,6 +169,46 @@ static void parse_touchquery(u8 *data, struct w8001_touch_query *query) >> ? ? ? query->y |= (data[2] >> 3) & 0x3; >> ?} >> >> +static void w8001_mt_event(struct input_dev *dev, >> + ? ? ? ? ? ? ? ? ? ? ? ?int slot, int tid, int x, int y) >> +{ >> + ? ? input_mt_slot(dev, slot); >> + ? ? if (tid != 0) { >> + ? ? ? ? ? ? input_report_abs(dev, ABS_MT_POSITION_X, x); >> + ? ? ? ? ? ? input_report_abs(dev, ABS_MT_POSITION_Y, y); >> + ? ? } >> + ? ? input_report_abs(dev, ABS_MT_TRACKING_ID, tid); >> + ? ? input_report_abs(dev, ABS_MT_TOOL_TYPE, MT_TOOL_FINGER); >> + ? ? input_mt_sync(dev); >> +} > >> + >> +static void w8001_track_fingers(struct w8001 *w8001, struct w8001_touch *touch) >> +{ >> + ? ? struct input_dev *dev = w8001->dev; >> + >> + ? ? if (touch->f1_status) { >> + ? ? ? ? ? ? if (!w8001->tracking_id[0]) >> + ? ? ? ? ? ? ? ? ? ? w8001->tracking_id[0] = get_next_tracking_id(); >> + ? ? ? ? ? ? w8001_mt_event(dev, 0, w8001->tracking_id[0], >> + ? ? ? ? ? ? ? ? ? ? ? ? ? ?touch->f1_x, touch->f1_y); >> + ? ? } else if (w8001->tracking_id[0]) { >> + ? ? ? ? ? ? w8001->tracking_id[0] = 0; >> + ? ? ? ? ? ? w8001_mt_event(dev, 0, 0, touch->f1_x, touch->f1_y); >> + ? ? } > >> + >> + ? ? if (touch->f2_status) { >> + ? ? ? ? ? ? if (!w8001->tracking_id[1]) >> + ? ? ? ? ? ? ? ? ? ? w8001->tracking_id[1] = get_next_tracking_id(); >> + ? ? ? ? ? ? w8001_mt_event(dev, 1, w8001->tracking_id[1], >> + ? ? ? ? ? ? ? ? ? ? ? ? ? ?touch->f2_x, touch->f2_y); >> + ? ? } else if (w8001->tracking_id[1]) { >> + ? ? ? ? ? ? w8001->tracking_id[1] = 0; >> + ? ? ? ? ? ? w8001_mt_event(dev, 1, 0, touch->f2_x, touch->f2_y); >> + ? ? } >> + >> + ? ? input_sync(dev); >> +} > > > Apparently, f1 and f2 represent the slots themselves, i.e., the device uses > slots internally. Please simplify the logic accordingly. There is an example in > the recent patch for the Bamboo Touch. > >> + >> ?static void report_pen_events(struct w8001 *w8001, struct w8001_coord *coord) >> ?{ >> ? ? ? struct input_dev *dev = w8001->dev; >> @@ -172,6 +253,7 @@ static irqreturn_t w8001_interrupt(struct serio *serio, >> ?{ >> ? ? ? struct w8001 *w8001 = serio_get_drvdata(serio); >> ? ? ? struct w8001_coord coord; >> + ? ? struct w8001_touch touch; >> ? ? ? unsigned char tmp; >> >> ? ? ? w8001->data[w8001->idx] = data; >> @@ -217,10 +299,11 @@ static irqreturn_t w8001_interrupt(struct serio *serio, >> ? ? ? ? ? ? ? complete(&w8001->cmd_done); >> ? ? ? ? ? ? ? break; >> >> + ? ? /* 2 finger touch packet */ >> ? ? ? case W8001_PKTLEN_TOUCH2FG - 1: >> - ? ? ? ? ? ? /* ignore two-finger touch packet. */ >> - ? ? ? ? ? ? if (w8001->pktlen == w8001->idx) >> - ? ? ? ? ? ? ? ? ? ? w8001->idx = 0; >> + ? ? ? ? ? ? w8001->idx = 0; >> + ? ? ? ? ? ? parse_touch(w8001->data, w8001->pktlen, &touch); >> + ? ? ? ? ? ? w8001_track_fingers(w8001, &touch); >> ? ? ? ? ? ? ? break; >> ? ? ? } >> >> @@ -282,6 +365,16 @@ static int w8001_setup(struct w8001 *w8001) >> ? ? ? ? ? ? ? ? ? ? ? break; >> ? ? ? ? ? ? ? case 5: >> ? ? ? ? ? ? ? ? ? ? ? w8001->pktlen = W8001_PKTLEN_TOUCH2FG; >> + >> + ? ? ? ? ? ? ? ? ? ? input_mt_create_slots(dev, 2); >> + ? ? ? ? ? ? ? ? ? ? input_set_abs_params(dev, ABS_MT_TRACKING_ID, >> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 0, 255, 0, 0); >> + ? ? ? ? ? ? ? ? ? ? input_set_abs_params(dev, ABS_MT_POSITION_X, >> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 0, touch.x, 0, 0); >> + ? ? ? ? ? ? ? ? ? ? input_set_abs_params(dev, ABS_MT_POSITION_Y, >> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 0, touch.y, 0, 0); >> + ? ? ? ? ? ? ? ? ? ? input_set_abs_params(dev, ABS_MT_TOOL_TYPE, >> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 0, 0, 0, 0); >> ? ? ? ? ? ? ? ? ? ? ? break; >> ? ? ? ? ? ? ? } >> ? ? ? } > > > No information about signal-to-noise ratio (fuzz) for this device? No. Ping -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/