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From: Jiada Wang <jiada_wang@mentor.com>
To: <nick@shmanahar.org>, <dmitry.torokhov@gmail.com>
Cc: <linux-input@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<jiada_wang@mentor.com>, <george_davis@mentor.com>
Subject: [PATCH v1 50/63] Input: Atmel: handle ReportID "0x00" while processing T5 messages
Date: Fri, 16 Aug 2019 17:37:44 +0900	[thread overview]
Message-ID: <20190816083757.19449-1-jiada_wang@mentor.com> (raw)

From: Deepak Das <deepak_das@mentor.com>

ReportID "0x00" is reserved by Atmel and should not be used by any
Atmel touch controller.

reportID is the first byte retrieved from T5 message payload.
Currently Atmel driver continues to process the T5 messages even if
the reportID "0x00" is returned by Touch Controller.

This commit modifies Atmel touch driver to return -EINVAL if ReportID
"0x00" is received while processing T5 messages.

Signed-off-by: Deepak Das <deepak_das@mentor.com>
Signed-off-by: George G. Davis <george_davis@mentor.com>
Signed-off-by: Jiada Wang <jiada_wang@mentor.com>
---
 drivers/input/touchscreen/atmel_mxt_ts.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index b17af89a4711..2041a82a4551 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -76,6 +76,7 @@
 #define MXT_PROCI_TOUCHSEQUENCELOGGER	93
 #define MXT_TOUCH_MULTITOUCHSCREEN_T100 100
 #define MXT_PROCI_ACTIVESTYLUS_T107	107
+#define MXT_RPTID_RESERVED		0
 
 /* MXT_GEN_MESSAGE_T5 object */
 #define MXT_RPTID_NOMSG		0xff
@@ -1385,6 +1386,11 @@ static int mxt_proc_message(struct mxt_data *data, u8 *message)
 	u8 report_id = message[0];
 	bool dump = data->debug_enabled;
 
+	if (report_id == MXT_RPTID_RESERVED) {
+		dev_err(&data->client->dev,
+			"Received Reserved ReportID 0x00\n");
+		return -EINVAL;
+	}
 	if (report_id == MXT_RPTID_NOMSG)
 		return 0;
 
@@ -1456,6 +1462,8 @@ static int mxt_read_and_process_messages(struct mxt_data *data, u8 count)
 		ret = mxt_proc_message(data,
 			data->msg_buf + data->T5_msg_size * i);
 
+		if (ret < 0)
+			return ret;
 		if (ret == 1)
 			num_valid++;
 	}
-- 
2.19.2


             reply	other threads:[~2019-08-16  8:40 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-16  8:37 Jiada Wang [this message]
2019-08-16  8:37 ` [PATCH v1 51/63] input: Atmel: limit the max bytes transferred while reading T5 messages Jiada Wang
2019-08-16  8:37 ` [PATCH v1 52/63] Input: Atmel: use T44 object to process " Jiada Wang
2019-08-16  8:37 ` [PATCH v1 53/63] Input: atmel_mxt_ts: use gpiod_set_value_cansleep for reset pin Jiada Wang
2019-08-16  8:37 ` [PATCH v1 54/63] Input: atmel_mxt_ts: Avoid race condition in freeing of input device Jiada Wang

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