mfd: Add WM8994 bulk register write operation

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

2 files changed, 25 insertions, 0 deletions

diff --git a/drivers/mfd/wm8994-core.c b/drivers/mfd/wm8994-core.c
index e673bda21f5d..5220af26419e 100644
--- a/drivers/mfd/wm8994-core.c
+++ b/drivers/mfd/wm8994-core.c
@@ -138,6 +138,29 @@ int wm8994_reg_write(struct wm8994 *wm8994, unsigned short reg,
 EXPORT_SYMBOL_GPL(wm8994_reg_write);
 
 /**
+ * wm8994_bulk_write: Write multiple WM8994 registers
+ *
+ * @wm8994: Device to write to
+ * @reg: First register
+ * @count: Number of registers
+ * @buf: Buffer to write from.
+ */
+int wm8994_bulk_write(struct wm8994 *wm8994, unsigned short reg,
+                      int count, u16 *buf)
+{
+        int ret;
+
+        mutex_lock(&wm8994->io_lock);
+
+        ret = wm8994_write(wm8994, reg, count * 2, buf);
+
+        mutex_unlock(&wm8994->io_lock);
+
+        return ret;
+}
+EXPORT_SYMBOL_GPL(wm8994_bulk_write);
+
+/**
  * wm8994_set_bits: Set the value of a bitfield in a WM8994 register
  *
  * @wm8994: Device to write to.
diff --git a/include/linux/mfd/wm8994/core.h b/include/linux/mfd/wm8994/core.h
index ef4f0b6083a3..cb7d3ae7da8f 100644
--- a/include/linux/mfd/wm8994/core.h
+++ b/include/linux/mfd/wm8994/core.h
@@ -88,6 +88,8 @@ int wm8994_set_bits(struct wm8994 *wm8994, unsigned short reg,
                     unsigned short mask, unsigned short val);
 int wm8994_bulk_read(struct wm8994 *wm8994, unsigned short reg,
                      int count, u16 *buf);
+int wm8994_bulk_write(struct wm8994 *wm8994, unsigned short reg,
+                     int count, u16 *buf);
 
 
 /* Helper to save on boilerplate */