From 390e80215217f32c35c7a2d6611407b759d695d2 Mon Sep 17 00:00:00 2001
From: Robert Nelson <robertcnelson@gmail.com>
Date: Thu, 29 Sep 2011 11:50:09 -0500
Subject: [PATCH 09/14] ksz8851 add is_level_irq

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
---
 drivers/net/ethernet/micrel/ks8851.c |   28 ++++++++++++++++++++++++----
 1 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/micrel/ks8851.c b/drivers/net/ethernet/micrel/ks8851.c
index 64be436..f771fd8 100644
--- a/drivers/net/ethernet/micrel/ks8851.c
+++ b/drivers/net/ethernet/micrel/ks8851.c
@@ -23,6 +23,7 @@
 #include <linux/crc32.h>
 #include <linux/mii.h>
 #include <linux/eeprom_93cx6.h>
+#include <linux/ks8851.h>
 
 #include <linux/spi/spi.h>
 
@@ -70,6 +71,7 @@ struct ks8851_rxctrl {
  * @rc_ccr: Cached copy of KS_CCR.
  * @rc_rxqcr: Cached copy of KS_RXQCR.
  * @eeprom_size: Companion eeprom size in Bytes, 0 if no eeprom
+ * @irq_flags: The IRQ flags passed to request_irq().
  *
  * The @lock ensures that the chip is protected when certain operations are
  * in progress. When the read or write packet transfer is in progress, most
@@ -118,6 +120,7 @@ struct ks8851_net {
 	struct spi_transfer	spi_xfer2[2];
 
 	struct eeprom_93cx6	eeprom;
+	unsigned		irq_flags;
 };
 
 static int msg_enable;
@@ -403,6 +406,15 @@ static void ks8851_init_mac(struct ks8851_net *ks)
 }
 
 /**
+ * is_level_irq() - return if the given IRQ flags are level triggered
+ * @flags: The flags passed to request_irq().
+*/
+static bool is_level_irq(unsigned flags)
+{
+	return flags & (IRQF_TRIGGER_LOW | IRQF_TRIGGER_HIGH);
+}
+
+/**
  * ks8851_irq - device interrupt handler
  * @irq: Interrupt number passed from the IRQ hnalder.
  * @pw: The private word passed to register_irq(), our struct ks8851_net.
@@ -414,7 +426,9 @@ static irqreturn_t ks8851_irq(int irq, void *pw)
 {
 	struct ks8851_net *ks = pw;
 
-	disable_irq_nosync(irq);
+	if (is_level_irq(ks->irq_flags))
+		disable_irq_nosync(irq);
+
 	schedule_work(&ks->irq_work);
 	return IRQ_HANDLED;
 }
@@ -646,7 +660,8 @@ static void ks8851_irq_work(struct work_struct *work)
 	if (status & IRQ_TXI)
 		netif_wake_queue(ks->netdev);
 
-	enable_irq(ks->netdev->irq);
+	if (is_level_irq(ks->irq_flags))
+		enable_irq(ks->netdev->irq);
 }
 
 /**
@@ -1657,6 +1672,7 @@ static int ks8851_resume(struct spi_device *spi)
 
 static int __devinit ks8851_probe(struct spi_device *spi)
 {
+	struct ks8851_pdata *pd = spi->dev.platform_data;
 	struct net_device *ndev;
 	struct ks8851_net *ks;
 	int ret;
@@ -1749,8 +1765,12 @@ static int __devinit ks8851_probe(struct spi_device *spi)
 	ks8851_read_selftest(ks);
 	ks8851_init_mac(ks);
 
-	ret = request_irq(spi->irq, ks8851_irq, IRQF_TRIGGER_LOW,
-			  ndev->name, ks);
+	if (pd && pd->irq_flags)
+		ks->irq_flags = pd->irq_flags;
+	else
+		ks->irq_flags = IRQF_TRIGGER_LOW;
+
+	ret = request_irq(spi->irq, ks8851_irq, ks->irq_flags, ndev->name, ks);
 	if (ret < 0) {
 		dev_err(&spi->dev, "failed to get irq\n");
 		goto err_irq;
-- 
1.7.7.4

