ssb: add gpio_to_irq

The old bcm47xx gpio code had support for gpio_to_irq, but the new
code did not provide this function, but returned -ENXIO all the time.
This patch adds the missing function.

arch/mips/bcm47xx/wgt634u.c calls gpio_to_irq() and got the correct irq
number with the old gpio handling code. With this patch the code in
wgt634u.c should work again. I do not have a wgt634u to test this.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 27 insertions, 0 deletions

diff --git a/drivers/ssb/driver_gpio.c b/drivers/ssb/driver_gpio.c
index 97ac0a38e3d0..accabe39b320 100644
--- a/drivers/ssb/driver_gpio.c
+++ b/drivers/ssb/driver_gpio.c
@@ -74,6 +74,16 @@ static void ssb_gpio_chipco_free(struct gpio_chip *chip, unsigned gpio)
         ssb_chipco_gpio_pullup(&bus->chipco, 1 << gpio, 0);
 }
 
+static int ssb_gpio_chipco_to_irq(struct gpio_chip *chip, unsigned gpio)
+{
+        struct ssb_bus *bus = ssb_gpio_get_bus(chip);
+
+        if (bus->bustype == SSB_BUSTYPE_SSB)
+                return ssb_mips_irq(bus->chipco.dev) + 2;
+        else
+                return -EINVAL;
+}
+
 static int ssb_gpio_chipco_init(struct ssb_bus *bus)
 {
         struct gpio_chip *chip = &bus->gpio;
@@ -86,6 +96,7 @@ static int ssb_gpio_chipco_init(struct ssb_bus *bus)
         chip->set               = ssb_gpio_chipco_set_value;
         chip->direction_input   = ssb_gpio_chipco_direction_input;
         chip->direction_output  = ssb_gpio_chipco_direction_output;
+        chip->to_irq            = ssb_gpio_chipco_to_irq;
         chip->ngpio             = 16;
         /* There is just one SoC in one device and its GPIO addresses should be
          * deterministic to address them more easily. The other buses could get
@@ -134,6 +145,16 @@ static int ssb_gpio_extif_direction_output(struct gpio_chip *chip,
         return 0;
 }
 
+static int ssb_gpio_extif_to_irq(struct gpio_chip *chip, unsigned gpio)
+{
+        struct ssb_bus *bus = ssb_gpio_get_bus(chip);
+
+        if (bus->bustype == SSB_BUSTYPE_SSB)
+                return ssb_mips_irq(bus->extif.dev) + 2;
+        else
+                return -EINVAL;
+}
+
 static int ssb_gpio_extif_init(struct ssb_bus *bus)
 {
         struct gpio_chip *chip = &bus->gpio;
@@ -144,6 +165,7 @@ static int ssb_gpio_extif_init(struct ssb_bus *bus)
         chip->set               = ssb_gpio_extif_set_value;
         chip->direction_input   = ssb_gpio_extif_direction_input;
         chip->direction_output  = ssb_gpio_extif_direction_output;
+        chip->to_irq            = ssb_gpio_extif_to_irq;
         chip->ngpio             = 5;
         /* There is just one SoC in one device and its GPIO addresses should be
          * deterministic to address them more easily. The other buses could get
diff --git a/include/linux/ssb/ssb_driver_mips.h b/include/linux/ssb/ssb_driver_mips.h
index 07a9c7a2e088..afe79d40a99e 100644
--- a/include/linux/ssb/ssb_driver_mips.h
+++ b/include/linux/ssb/ssb_driver_mips.h
@@ -45,6 +45,11 @@ void ssb_mipscore_init(struct ssb_mipscore *mcore)
 {
 }
 
+static inline unsigned int ssb_mips_irq(struct ssb_device *dev)
+{
+        return 0;
+}
+
 #endif /* CONFIG_SSB_DRIVER_MIPS */
 
 #endif /* LINUX_SSB_MIPSCORE_H_ */