From patchwork Fri Dec 22 18:31:14 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Francesco Dolcini X-Patchwork-Id: 13503708 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 5D8A0612E; Fri, 22 Dec 2023 18:31:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=dolcini.it Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=dolcini.it 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 A3E5821EB7; Fri, 22 Dec 2023 19:31:18 +0100 (CET) From: Francesco Dolcini To: Dmitry Torokhov Cc: Emanuele Ghidoli , linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, Francesco Dolcini Subject: [PATCH v3 2/2] Input: ilitek_ts_i2c - add report id message validation Date: Fri, 22 Dec 2023 19:31:14 +0100 Message-Id: <20231222183114.30775-3-francesco@dolcini.it> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20231222183114.30775-1-francesco@dolcini.it> References: <20231222183114.30775-1-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") Reviewed-by: Francesco Dolcini Signed-off-by: Emanuele Ghidoli Signed-off-by: Francesco Dolcini --- v3: added reviewed by --- 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 250133f0d68f..557362490244 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) goto err_sync_frame; } + if (buf[0] != ILITEK_TP_I2C_REPORT_ID) { + dev_err(dev, "get touch info failed. Wrong id: 0x%02X\n", buf[0]); + goto err_sync_frame; + } + 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",