From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:44988 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750855AbcEHRSO (ORCPT ); Sun, 8 May 2016 13:18:14 -0400 Subject: Patch "Input: ads7846 - correct the value got from SPI" has been added to the 3.14-stable tree To: andrey.gelman@compulab.co.il, dmitry.torokhov@gmail.com, gregkh@linuxfoundation.org, grinberg@compulab.co.il, haibo.chen@freescale.com Cc: , From: Date: Sun, 08 May 2016 19:18:11 +0200 Message-ID: <1462727891205157@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled Input: ads7846 - correct the value got from SPI to the 3.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: input-ads7846-correct-the-value-got-from-spi.patch and it can be found in the queue-3.14 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From 879f2fea8a5a748bcbf98d2cdce9139c045505d3 Mon Sep 17 00:00:00 2001 From: Andrey Gelman Date: Tue, 6 Oct 2015 15:43:43 -0700 Subject: Input: ads7846 - correct the value got from SPI From: Andrey Gelman commit 879f2fea8a5a748bcbf98d2cdce9139c045505d3 upstream. According to the touch controller spec, SPI return a 16 bit value, only 12 bits are valid, they are bit[14-3]. The value of MISO and MOSI can be configured when SPI is in idle mode. Currently this touch driver assumes the SPI bus sets the MOSI and MISO in low level when SPI bus is in idle mode. So the bit[15] of the value got from SPI bus is always 0. But when SPI bus congfigures the MOSI and MISO in high level during the SPI idle mode, the bit[15] of the value get from SPI is always 1. If bit[15] is not masked, we may get the wrong value. Mask the invalid bit to make sure the correct value gets returned. Regardless of the SPI bus idle configuration. Signed-off-by: Andrey Gelman Signed-off-by: Haibo Chen Signed-off-by: Igor Grinberg Signed-off-by: Dmitry Torokhov Signed-off-by: Greg Kroah-Hartman --- drivers/input/touchscreen/ads7846.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) --- a/drivers/input/touchscreen/ads7846.c +++ b/drivers/input/touchscreen/ads7846.c @@ -668,18 +668,22 @@ static int ads7846_no_filter(void *ads, static int ads7846_get_value(struct ads7846 *ts, struct spi_message *m) { + int value; struct spi_transfer *t = list_entry(m->transfers.prev, struct spi_transfer, transfer_list); if (ts->model == 7845) { - return be16_to_cpup((__be16 *)&(((char*)t->rx_buf)[1])) >> 3; + value = be16_to_cpup((__be16 *)&(((char *)t->rx_buf)[1])); } else { /* * adjust: on-wire is a must-ignore bit, a BE12 value, then * padding; built from two 8 bit values written msb-first. */ - return be16_to_cpup((__be16 *)t->rx_buf) >> 3; + value = be16_to_cpup((__be16 *)t->rx_buf); } + + /* enforce ADC output is 12 bits width */ + return (value >> 3) & 0xfff; } static void ads7846_update_value(struct spi_message *m, int val) Patches currently in stable-queue which might be from andrey.gelman@compulab.co.il are queue-3.14/input-ads7846-correct-the-value-got-from-spi.patch