mfd: Simulate active high IRQs with wm831x

In order to ease system integration provide a simulation of active high
IRQs on the GPIOs by polling the GPIO status when an IRQ is generated.

This isn't ideal on several fronts and will miss initially active IRQs in
the current implementation but it should work well for most cases.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 21 insertions, 1 deletions

diff --git a/drivers/mfd/wm831x-irq.c b/drivers/mfd/wm831x-irq.c
index a10937cfff4c..f4747a4a9a93 100644
--- a/drivers/mfd/wm831x-irq.c
+++ b/drivers/mfd/wm831x-irq.c
@@ -420,12 +420,19 @@ static int wm831x_irq_set_type(struct irq_data *data, unsigned int type)
         switch (type) {
         case IRQ_TYPE_EDGE_BOTH:
                 wm831x->gpio_update[irq] = 0x10000 | WM831X_GPN_INT_MODE;
+                wm831x->gpio_level[irq] = false;
                 break;
         case IRQ_TYPE_EDGE_RISING:
                 wm831x->gpio_update[irq] = 0x10000 | WM831X_GPN_POL;
+                wm831x->gpio_level[irq] = false;
                 break;
         case IRQ_TYPE_EDGE_FALLING:
                 wm831x->gpio_update[irq] = 0x10000;
+                wm831x->gpio_level[irq] = false;
+                break;
+        case IRQ_TYPE_LEVEL_HIGH:
+                wm831x->gpio_update[irq] = 0x10000 | WM831X_GPN_POL;
+                wm831x->gpio_level[irq] = true;
                 break;
         default:
                 return -EINVAL;
@@ -449,7 +456,7 @@ static irqreturn_t wm831x_irq_thread(int irq, void *data)
 {
         struct wm831x *wm831x = data;
         unsigned int i;
-        int primary, status_addr;
+        int primary, status_addr, ret;
         int status_regs[WM831X_NUM_IRQ_REGS] = { 0 };
         int read[WM831X_NUM_IRQ_REGS] = { 0 };
         int *status;
@@ -507,6 +514,19 @@ static irqreturn_t wm831x_irq_thread(int irq, void *data)
 
                 if (*status & wm831x_irqs[i].mask)
                         handle_nested_irq(wm831x->irq_base + i);
+
+                /* Simulate an edge triggered IRQ by polling the input
+                 * status.  This is sucky but improves interoperability.
+                 */
+                if (primary == WM831X_GP_INT &&
+                    wm831x->gpio_level[i - WM831X_IRQ_GPIO_1]) {
+                        ret = wm831x_reg_read(wm831x, WM831X_GPIO_LEVEL);
+                        while (ret & 1 << (i - WM831X_IRQ_GPIO_1)) {
+                                handle_nested_irq(wm831x->irq_base + i);
+                                ret = wm831x_reg_read(wm831x,
+                                                      WM831X_GPIO_LEVEL);
+                        }
+                }
         }
 
 out: