From patchwork Mon Aug 5 08:55:11 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Francesco Dolcini X-Patchwork-Id: 817210 Received: from mail11.truemail.it (mail11.truemail.it [217.194.8.81]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 86272145327; Mon, 5 Aug 2024 09:04:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.194.8.81 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722848672; cv=none; b=k4IZfJKHvQQb/pSaTU/fR801ZEm7qd1QYhvWPVdyXTDuvQZxwR8fZD936Lz2Dl5ORSgROai5kxm6bpRF94VGDzxcVEbj/jNweFBqp3HmpubUOvjgWi3EqKUEaAmsN2LN8xtk+8Ylty6T2P8UgSuLOR8NOV2aGxsji5k1Upgfz78= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722848672; c=relaxed/simple; bh=KBRKLckh7wQOcZPAb+DBayMKbbiWVVVv4cT0/iGxF1A=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=MrvrOFgmleEaSRwCWE/f+Pqa88E+8CSRXhEppzcGIc4V7kZqC5vOjQ57y6BZD3FEW1/gKURbyyTanQvZMHxmPaVxf6tDzgsUbXFESi1Kfja9RqVD0cZ67A2ydMg2TFA07O8om249aRe2qFPRL2sCRH0P/vKuGcBVjd6KcXOo+Ug= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=dolcini.it; spf=pass smtp.mailfrom=dolcini.it; dkim=pass (2048-bit key) header.d=dolcini.it header.i=@dolcini.it header.b=QkATNqlY; arc=none smtp.client-ip=217.194.8.81 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=dolcini.it Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=dolcini.it Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=dolcini.it header.i=@dolcini.it header.b="QkATNqlY" Received: from francesco-nb.pivistrello.it (93-49-2-63.ip317.fastwebnet.it [93.49.2.63]) by mail11.truemail.it (Postfix) with ESMTPA id 25175211BF; Mon, 5 Aug 2024 10:55:36 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=dolcini.it; s=default; t=1722848136; bh=QOED+ANpUoo8V/ba7IwkfN3s+t7dw1REOL+ohfmBxQg=; h=From:To:Subject; b=QkATNqlY+fWa7/ulLCCl3or1AOW6GJpSOosluXWRv8v8csljoc/JHynTvE2w8eaQ1 wC25+dkR4idD0j8dxyRgtJTN8xhbtlR7CqrjAV/nu5ggMqY1ar4bInIJmBjfRAcpwz 5Ew7sqbf3n8N7mX8Y7dTCpOMXWUJt+voEUpzNX4K/bycQ8nBMwZkgAjjfNzHHMnU9u X88jW5D/mVj6uRLiIAIPMGZNP7KIBgd2aKl3Jq7UxJnE6gvxxzFDOXWcm6eIw/sUO+ 1crSEDA8ugxU8lY9mJi5wdNsyBF1BYOXhNMS6MTU3r9YI1+5LPgYfvWD8cH8hPusVe du7Mi8lmnYYNg== From: Francesco Dolcini To: Dmitry Torokhov Cc: Emanuele Ghidoli , linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, Francesco Dolcini Subject: [PATCH v4 2/2] Input: ilitek_ts_i2c - add report id message validation Date: Mon, 5 Aug 2024 10:55:11 +0200 Message-Id: <20240805085511.43955-3-francesco@dolcini.it> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240805085511.43955-1-francesco@dolcini.it> References: <20240805085511.43955-1-francesco@dolcini.it> Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Emanuele Ghidoli Ilitek touch IC driver answer to plain i2c read request, after it has generated an interrupt request, with a report id message starting with an identifier and a series of points. If a request is sent unsolicited by an interrupt request the answer do not contain this identifier. Add a test to discard these messages, making the driver robust to spurious interrupt requests. Fixes: 42370681bd46 ("Input: Add support for ILITEK Lego Series") Signed-off-by: Emanuele Ghidoli Signed-off-by: Francesco Dolcini --- v4: - just return in case of error - removed reviewed by v3: https://lore.kernel.org/all/20231222183114.30775-1-francesco@dolcini.it/ - series taken over from Emanuele to Francesco and resent v2: https://lore.kernel.org/all/20230920074650.922292-1-ghidoliemanuele@gmail.com/ - first version v1: not existing, patch was initially sent as v2 by mistake --- drivers/input/touchscreen/ilitek_ts_i2c.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/input/touchscreen/ilitek_ts_i2c.c b/drivers/input/touchscreen/ilitek_ts_i2c.c index e1849185e18c..5a807ad72319 100644 --- a/drivers/input/touchscreen/ilitek_ts_i2c.c +++ b/drivers/input/touchscreen/ilitek_ts_i2c.c @@ -37,6 +37,8 @@ #define ILITEK_TP_CMD_GET_MCU_VER 0x61 #define ILITEK_TP_CMD_GET_IC_MODE 0xC0 +#define ILITEK_TP_I2C_REPORT_ID 0x48 + #define REPORT_COUNT_ADDRESS 61 #define ILITEK_SUPPORT_MAX_POINT 40 @@ -163,6 +165,11 @@ static int ilitek_process_and_report_v6(struct ilitek_ts_data *ts) return error; } + if (buf[0] != ILITEK_TP_I2C_REPORT_ID) { + dev_err(dev, "get touch info failed. Wrong id: 0x%02X\n", buf[0]); + return -EINVAL; + } + report_max_point = buf[REPORT_COUNT_ADDRESS]; if (report_max_point > ts->max_tp) { dev_err(dev, "FW report max point:%d > panel info. max:%d\n",