Messages in this thread Patch in this message | | | From | Emanuele Ghidoli <> | Subject | [PATCH v2 2/2] Input: ilitek_ts_i2c - add report id message validation | Date | Wed, 20 Sep 2023 09:46:50 +0200 |
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From: Emanuele Ghidoli <emanuele.ghidoli@toradex.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") Signed-off-by: Emanuele Ghidoli <emanuele.ghidoli@toradex.com> --- 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 0c3491e346f4..efce545236cd 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", -- 2.34.1
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