+static int wm831x_device_suspend(struct wm831x *wm831x)
+{
+ int reg, mask;
+
+ /* If the charger IRQs are a wake source then make sure we ack
+ * them even if they're not actively being used (eg, no power
+ * driver or no IRQ line wired up) then acknowledge the
+ * interrupts otherwise suspend won't last very long.
+ */
+ if (wm831x->charger_irq_wake) {
+ reg = wm831x_reg_read(wm831x, WM831X_INTERRUPT_STATUS_2_MASK);
+
+ mask = WM831X_CHG_BATT_HOT_EINT |
+ WM831X_CHG_BATT_COLD_EINT |
+ WM831X_CHG_BATT_FAIL_EINT |
+ WM831X_CHG_OV_EINT | WM831X_CHG_END_EINT |
+ WM831X_CHG_TO_EINT | WM831X_CHG_MODE_EINT |
+ WM831X_CHG_START_EINT;
+
+ /* If any of the interrupts are masked read the statuses */
+ if (reg & mask)
+ reg = wm831x_reg_read(wm831x,
+ WM831X_INTERRUPT_STATUS_2);
+
+ if (reg & mask) {
+ dev_info(wm831x->dev,
+ "Acknowledging masked charger IRQs: %x\n",
+ reg & mask);
+ wm831x_reg_write(wm831x, WM831X_INTERRUPT_STATUS_2,
+ reg & mask);
+ }
+ }
+
+ return 0;
+}
+