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path: root/drivers/iio/dac/ad5446.c
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Diffstat (limited to 'drivers/iio/dac/ad5446.c')
-rw-r--r--drivers/iio/dac/ad5446.c35
1 files changed, 34 insertions, 1 deletions
diff --git a/drivers/iio/dac/ad5446.c b/drivers/iio/dac/ad5446.c
index 241665b8183b..7f11c1c89960 100644
--- a/drivers/iio/dac/ad5446.c
+++ b/drivers/iio/dac/ad5446.c
@@ -22,7 +22,40 @@
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
-#include "ad5446.h"
+#define MODE_PWRDWN_1k 0x1
+#define MODE_PWRDWN_100k 0x2
+#define MODE_PWRDWN_TRISTATE 0x3
+
+/**
+ * struct ad5446_state - driver instance specific data
+ * @spi: spi_device
+ * @chip_info: chip model specific constants, available modes etc
+ * @reg: supply regulator
+ * @vref_mv: actual reference voltage used
+ */
+
+struct ad5446_state {
+ struct device *dev;
+ const struct ad5446_chip_info *chip_info;
+ struct regulator *reg;
+ unsigned short vref_mv;
+ unsigned cached_val;
+ unsigned pwr_down_mode;
+ unsigned pwr_down;
+};
+
+/**
+ * struct ad5446_chip_info - chip specific information
+ * @channel: channel spec for the DAC
+ * @int_vref_mv: AD5620/40/60: the internal reference voltage
+ * @write: chip specific helper function to write to the register
+ */
+
+struct ad5446_chip_info {
+ struct iio_chan_spec channel;
+ u16 int_vref_mv;
+ int (*write)(struct ad5446_state *st, unsigned val);
+};
static const char * const ad5446_powerdown_modes[] = {
"1kohm_to_gnd", "100kohm_to_gnd", "three_state"