1 files changed, 20 insertions, 0 deletions

diff --git a/drivers/mfd/ucb1400_core.c b/drivers/mfd/ucb1400_core.c
index 178159e264ce..78c2135c5de6 100644
--- a/drivers/mfd/ucb1400_core.c
+++ b/drivers/mfd/ucb1400_core.c
@@ -23,6 +23,26 @@
 #include <linux/module.h>
 #include <linux/ucb1400.h>
 
+unsigned int ucb1400_adc_read(struct snd_ac97 *ac97, u16 adc_channel,
+                int adcsync)
+{
+        unsigned int val;
+
+        if (adcsync)
+                adc_channel |= UCB_ADC_SYNC_ENA;
+
+        ucb1400_reg_write(ac97, UCB_ADC_CR, UCB_ADC_ENA | adc_channel);
+        ucb1400_reg_write(ac97, UCB_ADC_CR, UCB_ADC_ENA | adc_channel |
+                        UCB_ADC_START);
+
+        while (!((val = ucb1400_reg_read(ac97, UCB_ADC_DATA))
+                                & UCB_ADC_DAT_VALID))
+                schedule_timeout_uninterruptible(1);
+
+        return val & UCB_ADC_DAT_MASK;
+}
+EXPORT_SYMBOL_GPL(ucb1400_adc_read);
+
 static int ucb1400_core_probe(struct device *dev)
 {
         int err;