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>
diff --git a/drivers/gpio/wm831x-gpio.c b/drivers/gpio/wm831x-gpio.c
index 2554180..5b8dc09 100644
--- a/drivers/gpio/wm831x-gpio.c
+++ b/drivers/gpio/wm831x-gpio.c
@@ -38,10 +38,13 @@
{
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 @@
{
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 @@
{
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 @@
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 @@
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 4b2021a..c428d9f 100644
--- a/drivers/mfd/wm831x-core.c
+++ b/drivers/mfd/wm831x-core.c
@@ -1449,18 +1449,33 @@
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;
diff --git a/include/linux/mfd/wm831x/core.h b/include/linux/mfd/wm831x/core.h
index 5184b79..53580b5 100644
--- a/include/linux/mfd/wm831x/core.h
+++ b/include/linux/mfd/wm831x/core.h
@@ -254,6 +254,10 @@
int irq_masks_cur[WM831X_NUM_IRQ_REGS]; /* Currently active value */
int irq_masks_cache[WM831X_NUM_IRQ_REGS]; /* Cached hardware value */
+ /* Chip revision based flags */
+ unsigned has_gpio_ena:1; /* Has GPIO enable bit */
+ unsigned has_cs_sts:1; /* Has current sink status bit */
+
int num_gpio;
struct mutex auxadc_lock;
diff --git a/include/linux/mfd/wm831x/gpio.h b/include/linux/mfd/wm831x/gpio.h
index 2835614..9b163c5 100644
--- a/include/linux/mfd/wm831x/gpio.h
+++ b/include/linux/mfd/wm831x/gpio.h
@@ -41,6 +41,10 @@
#define WM831X_GPN_OD_MASK 0x0200 /* GPN_OD */
#define WM831X_GPN_OD_SHIFT 9 /* GPN_OD */
#define WM831X_GPN_OD_WIDTH 1 /* GPN_OD */
+#define WM831X_GPN_ENA 0x0080 /* GPN_ENA */
+#define WM831X_GPN_ENA_MASK 0x0080 /* GPN_ENA */
+#define WM831X_GPN_ENA_SHIFT 7 /* GPN_ENA */
+#define WM831X_GPN_ENA_WIDTH 1 /* GPN_ENA */
#define WM831X_GPN_TRI 0x0080 /* GPN_TRI */
#define WM831X_GPN_TRI_MASK 0x0080 /* GPN_TRI */
#define WM831X_GPN_TRI_SHIFT 7 /* GPN_TRI */