mfd: Add WM831x revision B support

Revision B of the WM831x devices changes the sense of the tristate
bit for GPIO configuration, inverting it to become an enable instead.
Take account of this in the gpiolib driver.

A current sink regulation status bit has also been added in revision B,
add a flag indicating if it's present but don't use it yet.

This revision also adds an interrupt on key up for the ON pin event
which the existing code is able to take advantage of.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

2 files changed, 31 insertions, 5 deletions

diff --git a/drivers/gpio/wm831x-gpio.c b/drivers/gpio/wm831x-gpio.c
index 2554180534a1..5b8dc098d80f 100644
--- a/drivers/gpio/wm831x-gpio.c
+++ b/drivers/gpio/wm831x-gpio.c
@@ -38,10 +38,13 @@ static int wm831x_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
 {
         struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
         struct wm831x *wm831x = wm831x_gpio->wm831x;
+        int val = WM831X_GPN_DIR;
+
+        if (wm831x->has_gpio_ena)
+                val |= WM831X_GPN_TRI;
 
         return wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset,
-                               WM831X_GPN_DIR | WM831X_GPN_TRI,
-                               WM831X_GPN_DIR);
+                               WM831X_GPN_DIR | WM831X_GPN_TRI, val);
 }
 
 static int wm831x_gpio_get(struct gpio_chip *chip, unsigned offset)
@@ -74,10 +77,14 @@ static int wm831x_gpio_direction_out(struct gpio_chip *chip,
 {
         struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
         struct wm831x *wm831x = wm831x_gpio->wm831x;
+        int val = 0;
         int ret;
 
+        if (wm831x->has_gpio_ena)
+                val |= WM831X_GPN_TRI;
+
         ret = wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset,
-                              WM831X_GPN_DIR | WM831X_GPN_TRI, 0);
+                              WM831X_GPN_DIR | WM831X_GPN_TRI, val);
         if (ret < 0)
                 return ret;
 
@@ -103,7 +110,7 @@ static void wm831x_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
 {
         struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
         struct wm831x *wm831x = wm831x_gpio->wm831x;
-        int i;
+        int i, tristated;
 
         for (i = 0; i < chip->ngpio; i++) {
                 int gpio = i + chip->base;
@@ -170,6 +177,10 @@ static void wm831x_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
                         break;
                 }
 
+                tristated = reg & WM831X_GPN_TRI;
+                if (wm831x->has_gpio_ena)
+                        tristated = !tristated;
+
                 seq_printf(s, " %s %s %s %s%s\n"
                            "                                  %s%s (0x%4x)\n",
                            reg & WM831X_GPN_DIR ? "in" : "out",
@@ -178,7 +189,7 @@ static void wm831x_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
                            powerdomain,
                            reg & WM831X_GPN_POL ? "" : " inverted",
                            reg & WM831X_GPN_OD ? "open-drain" : "CMOS",
-                           reg & WM831X_GPN_TRI ? " tristated" : "",
+                           tristated ? " tristated" : "",
                            reg);
         }
 }
diff --git a/drivers/mfd/wm831x-core.c b/drivers/mfd/wm831x-core.c
index 4b2021af1d96..c428d9f918fc 100644
--- a/drivers/mfd/wm831x-core.c
+++ b/drivers/mfd/wm831x-core.c
@@ -1449,18 +1449,33 @@ static int wm831x_device_init(struct wm831x *wm831x, unsigned long id, int irq)
         case WM8310:
                 parent = WM8310;
                 wm831x->num_gpio = 16;
+                if (rev > 0) {
+                        wm831x->has_gpio_ena = 1;
+                        wm831x->has_cs_sts = 1;
+                }
+
                 dev_info(wm831x->dev, "WM8310 revision %c\n", 'A' + rev);
                 break;
 
         case WM8311:
                 parent = WM8311;
                 wm831x->num_gpio = 16;
+                if (rev > 0) {
+                        wm831x->has_gpio_ena = 1;
+                        wm831x->has_cs_sts = 1;
+                }
+
                 dev_info(wm831x->dev, "WM8311 revision %c\n", 'A' + rev);
                 break;
 
         case WM8312:
                 parent = WM8312;
                 wm831x->num_gpio = 16;
+                if (rev > 0) {
+                        wm831x->has_gpio_ena = 1;
+                        wm831x->has_cs_sts = 1;
+                }
+
                 dev_info(wm831x->dev, "WM8312 revision %c\n", 'A' + rev);
                 break;