diff options
Diffstat (limited to 'drivers/hid/hid-sony.c')
| -rw-r--r-- | drivers/hid/hid-sony.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/hid/hid-sony.c b/drivers/hid/hid-sony.c index 43bb24cc5fc3..34988ce9434a 100644 --- a/drivers/hid/hid-sony.c +++ b/drivers/hid/hid-sony.c @@ -36,6 +36,8 @@ #include <linux/list.h> #include <linux/idr.h> #include <linux/input/mt.h> +#include <linux/crc32.h> +#include <asm/unaligned.h> #include "hid-ids.h" @@ -1021,6 +1023,7 @@ struct motion_output_report_02 { #define DS4_FEATURE_REPORT_0x02_SIZE 37 #define DS4_FEATURE_REPORT_0x81_SIZE 7 +#define DS4_INPUT_REPORT_0x11_SIZE 78 #define DS4_OUTPUT_REPORT_0x05_SIZE 32 #define DS4_OUTPUT_REPORT_0x11_SIZE 78 #define SIXAXIS_REPORT_0xF2_SIZE 17 @@ -1324,6 +1327,21 @@ static int sony_raw_event(struct hid_device *hdev, struct hid_report *report, } else if (((sc->quirks & DUALSHOCK4_CONTROLLER_USB) && rd[0] == 0x01 && size == 64) || ((sc->quirks & DUALSHOCK4_CONTROLLER_BT) && rd[0] == 0x11 && size == 78)) { + if (sc->quirks & DUALSHOCK4_CONTROLLER_BT) { + /* CRC check */ + u8 bthdr = 0xA1; + u32 crc; + u32 report_crc; + + crc = crc32_le(0xFFFFFFFF, &bthdr, 1); + crc = ~crc32_le(crc, rd, DS4_INPUT_REPORT_0x11_SIZE-4); + report_crc = get_unaligned_le32(&rd[DS4_INPUT_REPORT_0x11_SIZE-4]); + if (crc != report_crc) { + hid_dbg(sc->hdev, "DualShock 4 input report's CRC check failed, received crc 0x%0x != 0x%0x\n", + report_crc, crc); + return -EILSEQ; + } + } dualshock4_parse_report(sc, rd, size); } |