From 16fe1ad289019d78a8f8fdb65f08d298ee921cb3 Mon Sep 17 00:00:00 2001 From: Alexander Stein Date: Wed, 23 Mar 2016 18:01:27 +0100 Subject: [PATCH] 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 Signed-off-by: Linus Walleij --- drivers/gpio/gpio-mcp23s08.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) 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; -- 2.20.1