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authorMark Brown <broonie@opensource.wolfsonmicro.com>2008-11-08 00:57:33 +0100
committerSamuel Ortiz <samuel@sortiz.org>2009-01-04 12:17:37 +0100
commit858e674466427b1236eb5ef9568999a7df286b1e (patch)
tree24ca231b73d6919b3b70f0f6a9b39b650d71e1fb /drivers/mfd
parent2c5212279a89224512e421fa9f8bd0fabbab77d8 (diff)
downloadop-kernel-dev-858e674466427b1236eb5ef9568999a7df286b1e.zip
op-kernel-dev-858e674466427b1236eb5ef9568999a7df286b1e.tar.gz
mfd: Add some documentation for WM8350 register lock
Hopefully this will make the purpose of these functions a bit clearer, it's not immediately obvious that the lock is a hardware feature. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Samuel Ortiz <sameo@openedhand.com>
Diffstat (limited to 'drivers/mfd')
-rw-r--r--drivers/mfd/wm8350-core.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/mfd/wm8350-core.c b/drivers/mfd/wm8350-core.c
index 0d47fb9..d63a530 100644
--- a/drivers/mfd/wm8350-core.c
+++ b/drivers/mfd/wm8350-core.c
@@ -299,6 +299,13 @@ int wm8350_block_write(struct wm8350 *wm8350, int start_reg, int regs,
}
EXPORT_SYMBOL_GPL(wm8350_block_write);
+/**
+ * wm8350_reg_lock()
+ *
+ * The WM8350 has a hardware lock which can be used to prevent writes to
+ * some registers (generally those which can cause particularly serious
+ * problems if misused). This function enables that lock.
+ */
int wm8350_reg_lock(struct wm8350 *wm8350)
{
u16 key = WM8350_LOCK_KEY;
@@ -314,6 +321,15 @@ int wm8350_reg_lock(struct wm8350 *wm8350)
}
EXPORT_SYMBOL_GPL(wm8350_reg_lock);
+/**
+ * wm8350_reg_unlock()
+ *
+ * The WM8350 has a hardware lock which can be used to prevent writes to
+ * some registers (generally those which can cause particularly serious
+ * problems if misused). This function disables that lock so updates
+ * can be performed. For maximum safety this should be done only when
+ * required.
+ */
int wm8350_reg_unlock(struct wm8350 *wm8350)
{
u16 key = WM8350_UNLOCK_KEY;
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