drivers/leds/leds-pca9532.c: add gpio capability

Allow unused leds on pca9532 to be used as gpio.  The board I am working
on now has no less than 6 pca9532 chips.  One chips is used for only leds,
one has 14 leds and 2 gpio and the rest of the chips are gpio only.

There is also one board in mainline which could use this capabilty;
arch/arm/mach-iop32x/n2100.c
 232         {       .type = PCA9532_TYPE_NONE }, /* power OFF gpio */
 233         {       .type = PCA9532_TYPE_NONE }, /* reset gpio */

This patch defines a new pin type, PCA9532_TYPE_GPIO, and registers a
gpiochip if any pin has this type set.  The gpio will registers all chip
pins but will filter on gpio_request.

[randy.dunlap@oracle.com: fix build when GPIOLIB is not enabled]
Signed-off-by: Joachim Eastwood <joachim.eastwood@jotron.com>
Reviewed-by: Wolfram Sang <w.sang@pengutronix.de>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Jan Weitzel <j.weitzel@phytec.de>
Cc: Juergen Kilb <j.kilb@phytec.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/include/linux/leds-pca9532.h b/include/linux/leds-pca9532.h
index f158eb1149a..b8d6fffed4d 100644
--- a/include/linux/leds-pca9532.h
+++ b/include/linux/leds-pca9532.h
@@ -25,7 +25,7 @@ enum pca9532_state {
 };
 
 enum pca9532_type { PCA9532_TYPE_NONE, PCA9532_TYPE_LED,
-	PCA9532_TYPE_N2100_BEEP };
+	PCA9532_TYPE_N2100_BEEP, PCA9532_TYPE_GPIO };
 
 struct pca9532_led {
 	u8 id;
@@ -41,6 +41,7 @@ struct pca9532_platform_data {
 	struct pca9532_led leds[16];
 	u8 pwm[2];
 	u8 psc[2];
+	int gpio_base;
 };
 
 #endif /* __LINUX_PCA9532_H */