gpio: Add decode of WM8994 GPIO configuration

For the human reader.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

diff --git a/drivers/gpio/gpio-wm8994.c b/drivers/gpio/gpio-wm8994.c
index 96198f3..92ea535 100644 (file)
--- 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