1 files changed, 77 insertions, 2 deletions

diff --git a/drivers/gpio/gpio-wm8994.c b/drivers/gpio/gpio-wm8994.c
index 96198f3fab73..92ea5350dfe9 100644
--- a/drivers/gpio/gpio-wm8994.c
+++ b/drivers/gpio/gpio-wm8994.c
@@ -117,6 +117,60 @@ static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
 
 
 #ifdef CONFIG_DEBUG_FS
+static const char *wm8994_gpio_fn(u16 fn)
+{
+        switch (fn) {
+        case WM8994_GP_FN_PIN_SPECIFIC:
+                return "pin-specific";
+        case WM8994_GP_FN_GPIO:
+                return "GPIO";
+        case WM8994_GP_FN_SDOUT:
+                return "SDOUT";
+        case WM8994_GP_FN_IRQ:
+                return "IRQ";
+        case WM8994_GP_FN_TEMPERATURE:
+                return "Temperature";
+        case WM8994_GP_FN_MICBIAS1_DET:
+                return "MICBIAS1 detect";
+        case WM8994_GP_FN_MICBIAS1_SHORT:
+                return "MICBIAS1 short";
+        case WM8994_GP_FN_MICBIAS2_DET:
+                return "MICBIAS2 detect";
+        case WM8994_GP_FN_MICBIAS2_SHORT:
+                return "MICBIAS2 short";
+        case WM8994_GP_FN_FLL1_LOCK:
+                return "FLL1 lock";
+        case WM8994_GP_FN_FLL2_LOCK:
+                return "FLL2 lock";
+        case WM8994_GP_FN_SRC1_LOCK:
+                return "SRC1 lock";
+        case WM8994_GP_FN_SRC2_LOCK:
+                return "SRC2 lock";
+        case WM8994_GP_FN_DRC1_ACT:
+                return "DRC1 activity";
+        case WM8994_GP_FN_DRC2_ACT:
+                return "DRC2 activity";
+        case WM8994_GP_FN_DRC3_ACT:
+                return "DRC3 activity";
+        case WM8994_GP_FN_WSEQ_STATUS:
+                return "Write sequencer";
+        case WM8994_GP_FN_FIFO_ERROR:
+                return "FIFO error";
+        case WM8994_GP_FN_OPCLK:
+                return "OPCLK";
+        case WM8994_GP_FN_THW:
+                return "Thermal warning";
+        case WM8994_GP_FN_DCS_DONE:
+                return "DC servo";
+        case WM8994_GP_FN_FLL1_OUT:
+                return "FLL1 output";
+        case WM8994_GP_FN_FLL2_OUT:
+                return "FLL1 output";
+        default:
+                return "Unknown";
+        }
+}
+
 static void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
 {
         struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
@@ -148,8 +202,29 @@ static void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
                         continue;
                 }
 
-                /* No decode yet; note that GPIO2 is special */
-                seq_printf(s, "(%x)\n", reg);
+                if (reg & WM8994_GPN_DIR)
+                        seq_printf(s, "in ");
+                else
+                        seq_printf(s, "out ");
+
+                if (reg & WM8994_GPN_PU)
+                        seq_printf(s, "pull up ");
+
+                if (reg & WM8994_GPN_PD)
+                        seq_printf(s, "pull down ");
+
+                if (reg & WM8994_GPN_POL)
+                        seq_printf(s, "inverted ");
+                else
+                        seq_printf(s, "noninverted ");
+
+                if (reg & WM8994_GPN_OP_CFG)
+                        seq_printf(s, "open drain ");
+                else
+                        seq_printf(s, "CMOS ");
+
+                seq_printf(s, "%s (%x)\n",
+                           wm8994_gpio_fn(reg & WM8994_GPN_FN_MASK), reg);
         }
 }
 #else