ACPI: EC: enable burst functionality in EC.

Signed-off-by: Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 37 insertions, 52 deletions

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 5999abd9909d..e7ce6e449424 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -101,7 +101,6 @@ static struct acpi_ec {
         struct mutex lock;
         atomic_t query_pending;
         atomic_t event_count;
-        atomic_t leaving_burst; /* 0 : No, 1 : Yes, 2: abort */
         wait_queue_head_t wait;
 } *ec_ecdt;
 
@@ -173,56 +172,6 @@ static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event, unsigned count)
         return -ETIME;
 }
 
-#ifdef ACPI_FUTURE_USAGE
-/*
- * Note: samsung nv5000 doesn't work with ec burst mode.
- * http://bugzilla.kernel.org/show_bug.cgi?id=4980
- */
-int acpi_ec_enter_burst_mode(struct acpi_ec *ec)
-{
-        u8 tmp = 0;
-        u8 status = 0;
-
-        status = acpi_ec_read_status(ec);
-        if (status != -EINVAL && !(status & ACPI_EC_FLAG_BURST)) {
-                status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0);
-                if (status)
-                        goto end;
-                acpi_ec_write_cmd(ec, ACPI_EC_BURST_ENABLE);
-                status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1);
-                tmp = acpi_ec_read_data(ec);
-                if (tmp != 0x90) {      /* Burst ACK byte */
-                        return -EINVAL;
-                }
-        }
-
-        atomic_set(&ec->leaving_burst, 0);
-        return 0;
-      end:
-        ACPI_EXCEPTION((AE_INFO, status, "EC wait, burst mode"));
-        return -1;
-}
-
-int acpi_ec_leave_burst_mode(struct acpi_ec *ec)
-{
-        u8 status = 0;
-
-        status = acpi_ec_read_status(ec);
-        if (status != -EINVAL && (status & ACPI_EC_FLAG_BURST)) {
-                status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0);
-                if (status)
-                        goto end;
-                acpi_ec_write_cmd(ec, ACPI_EC_BURST_DISABLE);
-                acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0);
-        }
-        atomic_set(&ec->leaving_burst, 1);
-        return 0;
-      end:
-        ACPI_EXCEPTION((AE_INFO, status, "EC leave burst mode"));
-        return -1;
-}
-#endif                          /* ACPI_FUTURE_USAGE */
-
 static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command,
                                         const u8 * wdata, unsigned wdata_len,
                                         u8 * rdata, unsigned rdata_len)
@@ -312,6 +261,21 @@ static int acpi_ec_transaction(struct acpi_ec *ec, u8 command,
         return status;
 }
 
+/*
+ * Note: samsung nv5000 doesn't work with ec burst mode.
+ * http://bugzilla.kernel.org/show_bug.cgi?id=4980
+ */
+int acpi_ec_burst_enable(struct acpi_ec *ec)
+{
+        u8 d;
+        return acpi_ec_transaction(ec, ACPI_EC_BURST_ENABLE, NULL, 0, &d, 1);
+}
+
+int acpi_ec_burst_disable(struct acpi_ec *ec)
+{
+        return acpi_ec_transaction(ec, ACPI_EC_BURST_DISABLE, NULL, 0, NULL, 0);
+}
+
 static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data)
 {
         int result;
@@ -333,6 +297,28 @@ static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data)
 /*
  * Externally callable EC access functions. For now, assume 1 EC only
  */
+int ec_burst_enable(void)
+{
+        struct acpi_ec *ec;
+        if (!first_ec)
+                return -ENODEV;
+        ec = acpi_driver_data(first_ec);
+        return acpi_ec_burst_enable(ec);
+}
+
+EXPORT_SYMBOL(ec_burst_enable);
+
+int ec_burst_disable(void)
+{
+        struct acpi_ec *ec;
+        if (!first_ec)
+                return -ENODEV;
+        ec = acpi_driver_data(first_ec);
+        return acpi_ec_burst_disable(ec);
+}
+
+EXPORT_SYMBOL(ec_burst_disable);
+
 int ec_read(u8 addr, u8 * val)
 {
         struct acpi_ec *ec;
@@ -639,7 +625,6 @@ static int acpi_ec_add(struct acpi_device *device)
         atomic_set(&ec->query_pending, 0);
         atomic_set(&ec->event_count, 1);
         if (acpi_ec_mode == EC_INTR) {
-                atomic_set(&ec->leaving_burst, 1);
                 init_waitqueue_head(&ec->wait);
         }
         strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);