I/O expanders with less than 8 I/O (PCA9536 and PCA9537, currently) fail
to invoke interrupt handlers because the NBANK macro
#define NBANK(chip) (chip->gpio_chip.ngpio / BANK_SZ)
incorrectly calculates no banks for these devices. As a result,
pca953x_irq_pending() never sets the trigger_seen flag.
The patch below fixed the issue by changing the NBANK() macro.
Signed-off-by: Frank Edelhaeuser <mrpace2 <at> gmail.com>
---
diff -Nur a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
--- a/drivers/gpio/gpio-pca953x.c 2016-03-08 00:00:00.000000000 +0000
+++ b/drivers/gpio/gpio-pca953x.c 2016-03-08 00:00:00.000000000 +0000
@@ -86,7 +86,7 @@
#define MAX_BANK 5
#define BANK_SZ 8
-#define NBANK(chip) (chip->gpio_chip.ngpio / BANK_SZ)
+#define NBANK(chip) (((chip->gpio_chip.ngpio - 1) / BANK_SZ) + 1)
struct pca953x_chip {
unsigned gpio_start;
--
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