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authorMark Brown <broonie@opensource.wolfsonmicro.com>2013-03-24 23:05:58 +0000
committerSamuel Ortiz <sameo@linux.intel.com>2013-04-08 15:20:58 +0200
commit3092f8050eccce8463afe771f0910634a433e24b (patch)
tree5b178d5527cffdf65bd2d7d045b8b3d4da6d7855 /drivers/mfd/arizona-irq.c
parentf8a0941f1bbdbaa68441142675986501b48da8f5 (diff)
mfd: arizona: Allow GPIO to be specified for IRQ line
If a GPIO is specified for the chip IRQ line then request it. This improves support for systems that do not put pins into input mode when used as interrupts. Also use this GPIO when the primary IRQ is in edge triggered mode to detect if we have handled pending interrupts in order to improve robustness. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/mfd/arizona-irq.c')
-rw-r--r--drivers/mfd/arizona-irq.c66
1 files changed, 53 insertions, 13 deletions
diff --git a/drivers/mfd/arizona-irq.c b/drivers/mfd/arizona-irq.c
index aa25468d24a..f761cc119c0 100644
--- a/drivers/mfd/arizona-irq.c
+++ b/drivers/mfd/arizona-irq.c
@@ -94,6 +94,7 @@ static irqreturn_t arizona_ctrlif_err(int irq, void *data)
static irqreturn_t arizona_irq_thread(int irq, void *data)
{
struct arizona *arizona = data;
+ bool poll;
unsigned int val;
int ret;
@@ -103,20 +104,39 @@ static irqreturn_t arizona_irq_thread(int irq, void *data)
return IRQ_NONE;
}
- /* Always handle the AoD domain */
- handle_nested_irq(irq_find_mapping(arizona->virq, 0));
+ do {
+ poll = false;
+
+ /* Always handle the AoD domain */
+ handle_nested_irq(irq_find_mapping(arizona->virq, 0));
+
+ /*
+ * Check if one of the main interrupts is asserted and only
+ * check that domain if it is.
+ */
+ ret = regmap_read(arizona->regmap, ARIZONA_IRQ_PIN_STATUS,
+ &val);
+ if (ret == 0 && val & ARIZONA_IRQ1_STS) {
+ handle_nested_irq(irq_find_mapping(arizona->virq, 1));
+ } else if (ret != 0) {
+ dev_err(arizona->dev,
+ "Failed to read main IRQ status: %d\n", ret);
+ }
- /*
- * Check if one of the main interrupts is asserted and only
- * check that domain if it is.
- */
- ret = regmap_read(arizona->regmap, ARIZONA_IRQ_PIN_STATUS, &val);
- if (ret == 0 && val & ARIZONA_IRQ1_STS) {
- handle_nested_irq(irq_find_mapping(arizona->virq, 1));
- } else if (ret != 0) {
- dev_err(arizona->dev, "Failed to read main IRQ status: %d\n",
- ret);
- }
+ /*
+ * Poll the IRQ pin status to see if we're really done
+ * if the interrupt controller can't do it for us.
+ */
+ if (!arizona->pdata.irq_gpio) {
+ break;
+ } else if (arizona->pdata.irq_flags & IRQF_TRIGGER_RISING &&
+ gpio_get_value_cansleep(arizona->pdata.irq_gpio)) {
+ poll = true;
+ } else if (arizona->pdata.irq_flags & IRQF_TRIGGER_FALLING &&
+ !gpio_get_value_cansleep(arizona->pdata.irq_gpio)) {
+ poll = true;
+ }
+ } while (poll);
pm_runtime_mark_last_busy(arizona->dev);
pm_runtime_put_autosuspend(arizona->dev);
@@ -262,6 +282,26 @@ int arizona_irq_init(struct arizona *arizona)
}
}
+ /* Used to emulate edge trigger and to work around broken pinmux */
+ if (arizona->pdata.irq_gpio) {
+ if (gpio_to_irq(arizona->pdata.irq_gpio) != arizona->irq) {
+ dev_warn(arizona->dev, "IRQ %d is not GPIO %d (%d)\n",
+ arizona->irq, arizona->pdata.irq_gpio,
+ gpio_to_irq(arizona->pdata.irq_gpio));
+ arizona->irq = gpio_to_irq(arizona->pdata.irq_gpio);
+ }
+
+ ret = devm_gpio_request_one(arizona->dev,
+ arizona->pdata.irq_gpio,
+ GPIOF_IN, "arizona IRQ");
+ if (ret != 0) {
+ dev_err(arizona->dev,
+ "Failed to request IRQ GPIO %d:: %d\n",
+ arizona->pdata.irq_gpio, ret);
+ arizona->pdata.irq_gpio = 0;
+ }
+ }
+
ret = request_threaded_irq(arizona->irq, NULL, arizona_irq_thread,
flags, "arizona", arizona);