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>

2 files changed, 6 insertions, 4 deletions

diff --git a/drivers/w1/masters/ds1wm.c b/drivers/w1/masters/ds1wm.c
index 5747997f8d7d..688e435b4d9a 100644
--- a/drivers/w1/masters/ds1wm.c
+++ b/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);
diff --git a/include/linux/ds1wm.h b/include/linux/ds1wm.h
index 31f6e3c427fb..d3c65e48a2e7 100644
--- a/include/linux/ds1wm.h
+++ b/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);
 };