diff options
| author | Alexander Stein <alexander.stein@systec-electronic.com> | 2016-03-23 18:01:27 +0100 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2016-03-31 10:41:50 +0200 |
| commit | 16fe1ad289019d78a8f8fdb65f08d298ee921cb3 (patch) | |
| tree | 72891a503d0271a52ae54d6151df32d584d9dfa5 /drivers | |
| parent | 1418f9e6e02da2ad0a6aacc8645e6ad7496105e9 (diff) | |
| download | linux-16fe1ad289019d78a8f8fdb65f08d298ee921cb3.tar.bz2 | |
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpio/gpio-mcp23s08.c | 9 |
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; |