gpio: adp5588-gpio: support interrupt controller

Implement irq_chip functionality on ADP5588/5587 GPIO expanders.  Only
level sensitive interrupts are supported.  Interrupts provided by this
irq_chip must be requested using request_threaded_irq().

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 15 insertions, 0 deletions

diff --git a/include/linux/i2c/adp5588.h b/include/linux/i2c/adp5588.h
index 269181b8f623..531376b77773 100644
--- a/include/linux/i2c/adp5588.h
+++ b/include/linux/i2c/adp5588.h
@@ -74,6 +74,20 @@
 
 #define ADP5588_DEVICE_ID_MASK  0xF
 
+ /* Configuration Register1 */
+#define ADP5588_AUTO_INC        (1 << 7)
+#define ADP5588_GPIEM_CFG       (1 << 6)
+#define ADP5588_INT_CFG         (1 << 4)
+#define ADP5588_GPI_IEN         (1 << 1)
+
+/* Interrupt Status Register */
+#define ADP5588_GPI_INT         (1 << 1)
+#define ADP5588_KE_INT          (1 << 0)
+
+#define ADP5588_MAXGPIO         18
+#define ADP5588_BANK(offs)      ((offs) >> 3)
+#define ADP5588_BIT(offs)       (1u << ((offs) & 0x7))
+
 /* Put one of these structures in i2c_board_info platform_data */
 
 #define ADP5588_KEYMAPSIZE      80
@@ -128,6 +142,7 @@ struct adp5588_kpad_platform_data {
 
 struct adp5588_gpio_platform_data {
         unsigned gpio_start;            /* GPIO Chip base # */
+        unsigned irq_base;              /* interrupt base # */
         unsigned pullup_dis_mask;       /* Pull-Up Disable Mask */
         int     (*setup)(struct i2c_client *client,
                                 int gpio, unsigned ngpio,