[PATCH] mfd: asic3: Add to_irq() member to gpio_chip structure

[Paul Parsons]

The gpio_to_irq() macro is now defined as __gpio_to_irq() instead of IRQ_GPIO().
The __gpio_to_irq() function returns -ENXIO if the referenced gpio_chip
structure does not define a to_irq() member.
This is true of the asic3 gpio_chip structure, and thus calls to gpio_to_irq()
now fail (for example from the gpio-vbus module).
This patch defines the to_irq() member in the asic3 gpio_chip structure.

Signed-off-by: Paul Parsons <lost.distance@xxxxxxxxx>
---
diff -ru clean-3.3-rc1/drivers/mfd/asic3.c linux-3.3-rc1/drivers/mfd/asic3.c
--- clean-3.3-rc1/drivers/mfd/asic3.c	2012-01-19 23:04:48.000000000 +0000
+++ linux-3.3-rc1/drivers/mfd/asic3.c	2012-01-31 00:58:34.777451050 +0000
@@ -525,6 +525,11 @@
 	return;
 }
 
+static int asic3_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+	return (offset < ASIC3_NUM_GPIOS) ? IRQ_BOARD_START + offset : -ENXIO;
+}
+
 static __init int asic3_gpio_probe(struct platform_device *pdev,
 				   u16 *gpio_config, int num)
 {
@@ -976,6 +981,7 @@
 	asic->gpio.set = asic3_gpio_set;
 	asic->gpio.direction_input = asic3_gpio_direction_input;
 	asic->gpio.direction_output = asic3_gpio_direction_output;
+	asic->gpio.to_irq = asic3_gpio_to_irq;
 
 	ret = asic3_gpio_probe(pdev,
 			       pdata->gpio_config,

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