iio: proximity: vcnl3020: fix ISR bitmask check in IRQ handler

The threaded IRQ handler contained multiple issues in handling interrupt
events and clearing status flags:

1. ISR bit check: The handler incorrectly checked the Interrupt Status
   Register (VCNL_ISR) against VCNL_ICR_THRES_EN (BIT(1)), which is a
   bitmask meant for the Control Register (VCNL_PS_ICR). In VCNL_ISR,
   BIT(1) corresponds only to low-threshold interrupts. A high-threshold
   interrupt (VCNL_INT_TH_HI, BIT(0)) on its own was completely ignored and
   returned IRQ_NONE.

2. Event direction & channel index: The handler unconditionally pushed a
   RISING event code on channel index 1. The driver only registers a single
   proximity channel (index 0), and low-threshold interrupts should be
   reported with IIO_EV_DIR_FALLING.

3. ISR clearing: The write-back to acknowledge the interrupt only preserved
   BIT(1) instead of masking against both valid status bits.

Fix this by checking both VCNL_INT_TH_HI and VCNL_INT_TH_LOW bits in
VCNL_ISR, pushing separate IIO events with the correct direction and
channel index (0), and properly clearing handled status bits.

Fixes: 3363fbbe19e5 ("iio: proximity: vcnl3020: add periodic mode")
Signed-off-by: Salah Triki <salah.triki@gmail.com>
Reviewed-by: Ivan Mikhaylov <fr0st61te@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Jonathan Cameron <jonathan.cameron@oss.qualcomm.com>

0 files changed, 0 insertions, 0 deletions