DS1WM: decouple host IRQ and INTR active state settings

The DS1WM driver incorrectly infers the IAS bit (1-wire interrupt active
high) from IRQ settings.  There are devices that have IAS=0 but still need
the IRQ to trigger on a rising edge.  With this patch, machines with DS1WM
that need IAS=1 have to set .active_high=1 in the ds1wm_platform_data.

Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com>
Acked-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Acked-by: Matt Reimer <mreimer@vpop.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/w1/masters/ds1wm.c

@@ -361,11 +361,12 @@ static int ds1wm_probe(struct platform_device *pdev)
 		goto err1;
 	}
 	ds1wm_data->irq = res->start;
-	ds1wm_data->active_high = (res->flags & IORESOURCE_IRQ_HIGHEDGE) ?
-		1 : 0;
+	ds1wm_data->active_high = plat->active_high;
 
-	set_irq_type(ds1wm_data->irq, ds1wm_data->active_high ?
-			IRQ_TYPE_EDGE_RISING : IRQ_TYPE_EDGE_FALLING);
+	if (res->flags & IORESOURCE_IRQ_HIGHEDGE)
+		set_irq_type(ds1wm_data->irq, IRQ_TYPE_EDGE_RISING);
+	if (res->flags & IORESOURCE_IRQ_LOWEDGE)
+		set_irq_type(ds1wm_data->irq, IRQ_TYPE_EDGE_FALLING);
 
 	ret = request_irq(ds1wm_data->irq, ds1wm_isr, IRQF_DISABLED,
 			  "ds1wm", ds1wm_data);

include/linux/ds1wm.h

@@ -6,6 +6,7 @@ struct ds1wm_platform_data {
 			     * e.g. on h5xxx and h2200 this is 2
 			     * (registers aligned to 4-byte boundaries),
 			     * while on hx4700 this is 1 */
+	int active_high;
 	void (*enable)(struct platform_device *pdev);
 	void (*disable)(struct platform_device *pdev);
 };