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authorAlexander Stein <alexander.stein@systec-electronic.com>2016-03-23 18:01:27 +0100
committerLinus Walleij <linus.walleij@linaro.org>2016-03-31 10:41:50 +0200
commit16fe1ad289019d78a8f8fdb65f08d298ee921cb3 (patch)
tree72891a503d0271a52ae54d6151df32d584d9dfa5
parent1418f9e6e02da2ad0a6aacc8645e6ad7496105e9 (diff)
gpio: mcp23s08: Add support for level triggered interrupts
The interrupt for the corresponding pin is configured to trigger when the pin state changes compared to a preconfigured state (Bit set in INTCON). This state is set by setting/clearing the bit in DEFVAL. In the interrupt handler we need also to check if the bit in INTCON is set for level triggered interrupts. Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
-rw-r--r--drivers/gpio/gpio-mcp23s08.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/gpio/gpio-mcp23s08.c b/drivers/gpio/gpio-mcp23s08.c
index c882c2be5a0e..ac22efc1840e 100644
--- a/drivers/gpio/gpio-mcp23s08.c
+++ b/drivers/gpio/gpio-mcp23s08.c
@@ -362,7 +362,8 @@ static irqreturn_t mcp23s08_irq(int irq, void *data)
for (i = 0; i < mcp->chip.ngpio; i++) {
if ((BIT(i) & mcp->cache[MCP_INTF]) &&
((BIT(i) & intcap & mcp->irq_rise) ||
- (mcp->irq_fall & ~intcap & BIT(i)))) {
+ (mcp->irq_fall & ~intcap & BIT(i)) ||
+ (BIT(i) & mcp->cache[MCP_INTCON]))) {
child_irq = irq_find_mapping(mcp->chip.irqdomain, i);
handle_nested_irq(child_irq);
}
@@ -408,6 +409,12 @@ static int mcp23s08_irq_set_type(struct irq_data *data, unsigned int type)
mcp->cache[MCP_INTCON] &= ~BIT(pos);
mcp->irq_rise &= ~BIT(pos);
mcp->irq_fall |= BIT(pos);
+ } else if (type & IRQ_TYPE_LEVEL_HIGH) {
+ mcp->cache[MCP_INTCON] |= BIT(pos);
+ mcp->cache[MCP_DEFVAL] &= ~BIT(pos);
+ } else if (type & IRQ_TYPE_LEVEL_LOW) {
+ mcp->cache[MCP_INTCON] |= BIT(pos);
+ mcp->cache[MCP_DEFVAL] |= BIT(pos);
} else
return -EINVAL;