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-rw-r--r--include/linux/i2c-vid.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/i2c-vid.h b/include/linux/i2c-vid.h
index 974835e3530..41d0635e0ba 100644
--- a/include/linux/i2c-vid.h
+++ b/include/linux/i2c-vid.h
@@ -97,3 +97,15 @@ static inline int vid_from_reg(int val, int vrm)
2050 - (val) * 50);
}
}
+
+static inline int vid_to_reg(int val, int vrm)
+{
+ switch (vrm) {
+ case 91: /* VRM 9.1 */
+ case 90: /* VRM 9.0 */
+ return ((val >= 1100) && (val <= 1850) ?
+ ((18499 - val * 10) / 25 + 5) / 10 : -1);
+ default:
+ return -1;
+ }
+}