From patchwork Mon Oct 27 11:08:28 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Vignesh Raghavendra X-Patchwork-Id: 5159711 Return-Path: X-Original-To: patchwork-linux-omap@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id D16A4C11AC for ; Mon, 27 Oct 2014 11:11:40 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id E8CC72011E for ; Mon, 27 Oct 2014 11:11:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DFD5120256 for ; Mon, 27 Oct 2014 11:11:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752278AbaJ0LKT (ORCPT ); Mon, 27 Oct 2014 07:10:19 -0400 Received: from arroyo.ext.ti.com ([192.94.94.40]:37751 "EHLO arroyo.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752114AbaJ0LKQ (ORCPT ); Mon, 27 Oct 2014 07:10:16 -0400 Received: from dlelxv90.itg.ti.com ([172.17.2.17]) by arroyo.ext.ti.com (8.13.7/8.13.7) with ESMTP id s9RB967F018774; Mon, 27 Oct 2014 06:09:07 -0500 Received: from DFLE72.ent.ti.com (dfle72.ent.ti.com [128.247.5.109]) by dlelxv90.itg.ti.com (8.14.3/8.13.8) with ESMTP id s9RB969Z006363; Mon, 27 Oct 2014 06:09:06 -0500 Received: from dlep33.itg.ti.com (157.170.170.75) by DFLE72.ent.ti.com (128.247.5.109) with Microsoft SMTP Server id 14.3.174.1; Mon, 27 Oct 2014 06:09:06 -0500 Received: from uda0132425.apr.dhcp.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by dlep33.itg.ti.com (8.14.3/8.13.8) with ESMTP id s9RB8pHu016403; Mon, 27 Oct 2014 06:08:59 -0500 From: Vignesh R To: Rob Herring , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , Benoit Cousson , Tony Lindgren , Russell King , Jonathan Cameron , Dmitry Torokhov CC: Hartmut Knaack , Lars-Peter Clausen , Peter Meerwald , Samuel Ortiz , Lee Jones , Felipe Balbi , Sebastian Andrzej Siewior , Jan Kardell , Paul Gortmaker , Brad Griffis , , , , , , , Vignesh R Subject: [PATCH 1/4] input: touchscreen: ti_am335x_tsc Interchange touchscreen and ADC steps Date: Mon, 27 Oct 2014 16:38:28 +0530 Message-ID: <1414408111-2631-2-git-send-email-vigneshr@ti.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1414408111-2631-1-git-send-email-vigneshr@ti.com> References: <1414408111-2631-1-git-send-email-vigneshr@ti.com> MIME-Version: 1.0 Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org X-Spam-Status: No, score=-7.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Brad Griffis This patch makes the initial changes required to workaround TSC-false pen-up interrupts. It is required to implement these changes in order to remove udelay in the TSC interrupt handler and false pen-up events. The charge step is to be executed immediately after sampling X+. Hence TSC is made to use higher numbered steps (steps 5 to 16 for 5 co-ordinate readouts, 4 wire TSC configuration) and ADC to use lower ones. Further X co-ordinate readouts must be the last to be sampled, thus co-ordinates are sampled in the order Y-Z-X. Signed-off-by: Brad Griffis [vigneshr@ti.com: Ported the patch from v3.12 to v3.18rc2] Signed-off-by: Vignesh R --- drivers/iio/adc/ti_am335x_adc.c | 2 +- drivers/input/touchscreen/ti_am335x_tsc.c | 42 ++++++++++++++++++------------- 2 files changed, 25 insertions(+), 19 deletions(-) diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c index b730864731e8..3f530ed6bd80 100644 --- a/drivers/iio/adc/ti_am335x_adc.c +++ b/drivers/iio/adc/ti_am335x_adc.c @@ -98,7 +98,7 @@ static void tiadc_step_config(struct iio_dev *indio_dev) * needs to be given to ADC to digitalize data. */ - steps = TOTAL_STEPS - adc_dev->channels; + steps = 0; if (iio_buffer_enabled(indio_dev)) stepconfig = STEPCONFIG_AVG_16 | STEPCONFIG_FIFO1 | STEPCONFIG_MODE_SWCNT; diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c index 2ce649520fe0..1aeac9675fe7 100644 --- a/drivers/input/touchscreen/ti_am335x_tsc.c +++ b/drivers/input/touchscreen/ti_am335x_tsc.c @@ -121,7 +121,7 @@ static void titsc_step_config(struct titsc *ts_dev) { unsigned int config; int i; - int end_step; + int end_step, first_step, tsc_steps; u32 stepenable; config = STEPCONFIG_MODE_HWSYNC | @@ -140,9 +140,11 @@ static void titsc_step_config(struct titsc *ts_dev) break; } - /* 1 … coordinate_readouts is for X */ - end_step = ts_dev->coordinate_readouts; - for (i = 0; i < end_step; i++) { + tsc_steps = ts_dev->coordinate_readouts * 2 + 2; + first_step = TOTAL_STEPS - tsc_steps; + /* Steps 16 to 16-coordinate_readouts is for X */ + end_step = first_step + tsc_steps; + for (i = end_step - ts_dev->coordinate_readouts; i < end_step; i++) { titsc_writel(ts_dev, REG_STEPCONFIG(i), config); titsc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY); } @@ -164,9 +166,9 @@ static void titsc_step_config(struct titsc *ts_dev) break; } - /* coordinate_readouts … coordinate_readouts * 2 is for Y */ - end_step = ts_dev->coordinate_readouts * 2; - for (i = ts_dev->coordinate_readouts; i < end_step; i++) { + /* 1 ... coordinate_readouts is for Y */ + end_step = first_step + ts_dev->coordinate_readouts; + for (i = first_step; i < end_step; i++) { titsc_writel(ts_dev, REG_STEPCONFIG(i), config); titsc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY); } @@ -179,7 +181,7 @@ static void titsc_step_config(struct titsc *ts_dev) titsc_writel(ts_dev, REG_CHARGECONFIG, config); titsc_writel(ts_dev, REG_CHARGEDELAY, CHARGEDLY_OPENDLY); - /* coordinate_readouts * 2 … coordinate_readouts * 2 + 2 is for Z */ + /* coordinate_readouts + 1 ... coordinate_readouts + 2 is for Z */ config = STEPCONFIG_MODE_HWSYNC | STEPCONFIG_AVG_16 | ts_dev->bit_yp | ts_dev->bit_xn | STEPCONFIG_INM_ADCREFM | @@ -194,8 +196,11 @@ static void titsc_step_config(struct titsc *ts_dev) titsc_writel(ts_dev, REG_STEPDELAY(end_step), STEPCONFIG_OPENDLY); - /* The steps1 … end and bit 0 for TS_Charge */ - stepenable = (1 << (end_step + 2)) - 1; + /* The steps end ... end - readouts * 2 + 2 and bit 0 for TS_Charge */ + stepenable = 1; + for (i = 0; i < tsc_steps; i++) + stepenable |= 1 << (first_step + i + 1); + ts_dev->step_mask = stepenable; am335x_tsc_se_set_cache(ts_dev->mfd_tscadc, ts_dev->step_mask); } @@ -209,6 +214,7 @@ static void titsc_read_coordinates(struct titsc *ts_dev, unsigned int read, diff; unsigned int i, channel; unsigned int creads = ts_dev->coordinate_readouts; + unsigned int first_step = TOTAL_STEPS - (creads * 2 + 2); *z1 = *z2 = 0; if (fifocount % (creads * 2 + 2)) @@ -226,7 +232,7 @@ static void titsc_read_coordinates(struct titsc *ts_dev, channel = (read & 0xf0000) >> 16; read &= 0xfff; - if (channel < creads) { + if (channel > first_step + creads + 2) { diff = abs(read - prev_val_x); if (diff < prev_diff_x) { prev_diff_x = diff; @@ -234,19 +240,19 @@ static void titsc_read_coordinates(struct titsc *ts_dev, } prev_val_x = read; - } else if (channel < creads * 2) { + } else if (channel == first_step + creads + 1) { + *z1 = read; + + } else if (channel == first_step + creads + 2) { + *z2 = read; + + } else if (channel > first_step) { diff = abs(read - prev_val_y); if (diff < prev_diff_y) { prev_diff_y = diff; *y = read; } prev_val_y = read; - - } else if (channel < creads * 2 + 1) { - *z1 = read; - - } else if (channel < creads * 2 + 2) { - *z2 = read; } } }