powerpc/powernv: Add OPAL interfaces for accessing and modifying syst…

…em LED states

This patch registers the following two new OPAL interfaces calls
for the platform LED subsystem. With the help of these new OPAL calls,
the kernel will be able to get or set the state of various individual
LEDs on the system at any given location code which is passed through
the LED specific device tree nodes.

	(1) OPAL_LEDS_GET_INDICATOR     opal_leds_get_ind
	(2) OPAL_LEDS_SET_INDICATOR     opal_leds_set_ind

Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
Acked-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Tested-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/include/asm/opal-api.h

@@ -154,6 +154,8 @@
 #define OPAL_FLASH_WRITE 111
 #define OPAL_FLASH_ERASE 112
 #define OPAL_PRD_MSG 113
+#define OPAL_LEDS_GET_INDICATOR 114
+#define OPAL_LEDS_SET_INDICATOR 115
 #define OPAL_CEC_REBOOT2 116
 #define OPAL_LAST 116
 

arch/powerpc/include/asm/opal.h

@@ -197,6 +197,10 @@ int64_t opal_ipmi_recv(uint64_t interface, struct opal_ipmi_msg *msg,
 int64_t opal_i2c_request(uint64_t async_token, uint32_t bus_id,
  struct opal_i2c_request *oreq);
 int64_t opal_prd_msg(struct opal_prd_msg *msg);
+int64_t opal_leds_get_ind(char *loc_code, __be64 *led_mask,
+ __be64 *led_value, __be64 *max_led_type);
+int64_t opal_leds_set_ind(uint64_t token, char *loc_code, const u64 led_mask,
+ const u64 led_value, __be64 *max_led_type);
 
 int64_t opal_flash_read(uint64_t id, uint64_t offset, uint64_t buf,
  uint64_t size, uint64_t token);

arch/powerpc/platforms/powernv/opal-wrappers.S

@@ -299,3 +299,5 @@ OPAL_CALL(opal_flash_read, OPAL_FLASH_READ);
 OPAL_CALL(opal_flash_write, OPAL_FLASH_WRITE);
 OPAL_CALL(opal_flash_erase, OPAL_FLASH_ERASE);
 OPAL_CALL(opal_prd_msg, OPAL_PRD_MSG);
+OPAL_CALL(opal_leds_get_ind, OPAL_LEDS_GET_INDICATOR);
+OPAL_CALL(opal_leds_set_ind, OPAL_LEDS_SET_INDICATOR);