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Input: ilitek_ts_i2c - add report id message validation

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[ Upstream commit 208989744a ]

Ensure that the touchscreen response has correct "report id" byte
before processing the touch data and discard other messages.

Fixes: 42370681bd ("Input: Add support for ILITEK Lego Series")
Signed-off-by: Emanuele Ghidoli <emanuele.ghidoli@toradex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Link: https://lore.kernel.org/r/20240805085511.43955-3-francesco@dolcini.it
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Emanuele Ghidoli 2024-08-05 10:55:11 +02:00 committed by Greg Kroah-Hartman
parent 831886bf1a
commit 075a0ce1fa
1 changed files with 7 additions and 0 deletions
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7
drivers/input/touchscreen/ilitek_ts_i2c.c
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@ -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",