[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20231222183114.30775-3-francesco@dolcini.it>
Date: Fri, 22 Dec 2023 19:31:14 +0100
From: Francesco Dolcini <francesco@...cini.it>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: Emanuele Ghidoli <emanuele.ghidoli@...adex.com>,
linux-input@...r.kernel.org,
linux-kernel@...r.kernel.org,
Francesco Dolcini <francesco.dolcini@...adex.com>
Subject: [PATCH v3 2/2] Input: ilitek_ts_i2c - add report id message validation
From: Emanuele Ghidoli <emanuele.ghidoli@...adex.com>
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 <francesco.dolcini@...adex.com>
Signed-off-by: Emanuele Ghidoli <emanuele.ghidoli@...adex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@...adex.com>
---
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",
--
2.25.1
Powered by blists - more mailing lists