Merge tag 'v2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

[mv-sheeva.git] / drivers / staging / iio / dac / ad5446.h

diff --git a/drivers/staging/iio/dac/ad5446.h b/drivers/staging/iio/dac/ad5446.h
new file mode 100644 (file)
index 0000000..902542e
--- /dev/null
+++ b/drivers/staging/iio/dac/ad5446.h
@@ -0,0 +1,96 @@
+/*
+ * AD5446 SPI DAC driver
+ *
+ * Copyright 2010 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+#ifndef IIO_DAC_AD5446_H_
+#define IIO_DAC_AD5446_H_
+
+/* DAC Control Bits */
+
+#define AD5446_LOAD            (0x0 << 14) /* Load and update */
+#define AD5446_SDO_DIS         (0x1 << 14) /* Disable SDO */
+#define AD5446_NOP             (0x2 << 14) /* No operation */
+#define AD5446_CLK_RISING      (0x3 << 14) /* Clock data on rising edge */
+
+#define AD5620_LOAD            (0x0 << 14) /* Load and update Norm Operation*/
+#define AD5620_PWRDWN_1k       (0x1 << 14) /* Power-down: 1kOhm to GND */
+#define AD5620_PWRDWN_100k     (0x2 << 14) /* Power-down: 100kOhm to GND */
+#define AD5620_PWRDWN_TRISTATE (0x3 << 14) /* Power-down: Three-state */
+
+#define AD5660_LOAD            (0x0 << 16) /* Load and update Norm Operation*/
+#define AD5660_PWRDWN_1k       (0x1 << 16) /* Power-down: 1kOhm to GND */
+#define AD5660_PWRDWN_100k     (0x2 << 16) /* Power-down: 100kOhm to GND */
+#define AD5660_PWRDWN_TRISTATE (0x3 << 16) /* Power-down: Three-state */
+
+#define RES_MASK(bits) ((1 << (bits)) - 1)
+
+/**
+ * struct ad5446_state - driver instance specific data
+ * @indio_dev:         the industrial I/O device
+ * @spi:               spi_device
+ * @chip_info:         chip model specific constants, available modes etc
+ * @reg:               supply regulator
+ * @poll_work:         bottom half of polling interrupt handler
+ * @vref_mv:           actual reference voltage used
+ * @xfer:              default spi transfer
+ * @msg:               default spi message
+ * @data:              spi transmit buffer
+ */
+
+struct ad5446_state {
+       struct iio_dev                  *indio_dev;
+       struct spi_device               *spi;
+       const struct ad5446_chip_info   *chip_info;
+       struct regulator                *reg;
+       struct work_struct              poll_work;
+       unsigned short                  vref_mv;
+       struct spi_transfer             xfer;
+       struct spi_message              msg;
+       union {
+               unsigned short          d16;
+               unsigned char           d24[3];
+       } data;
+};
+
+/**
+ * struct ad5446_chip_info - chip specific information
+ * @bits:              accuracy of the DAC in bits
+ * @storagebits:       number of bits written to the DAC
+ * @left_shift:                number of bits the datum must be shifted
+ * @int_vref_mv:       AD5620/40/60: the internal reference voltage
+ * @store_sample:      chip specific helper function to store the datum
+ */
+
+struct ad5446_chip_info {
+       u8                              bits;
+       u8                              storagebits;
+       u8                              left_shift;
+       u16                             int_vref_mv;
+       void (*store_sample)            (struct ad5446_state *st, unsigned val);
+};
+
+/**
+ * ad5446_supported_device_ids:
+ * The AD5620/40/60 parts are available in different fixed internal reference
+ * voltage options. The actual part numbers may look differently
+ * (and a bit cryptic), however this style is used to make clear which
+ * parts are supported here.
+ */
+
+enum ad5446_supported_device_ids {
+       ID_AD5444,
+       ID_AD5446,
+       ID_AD5542A,
+       ID_AD5512A,
+       ID_AD5620_2500,
+       ID_AD5620_1250,
+       ID_AD5640_2500,
+       ID_AD5640_1250,
+       ID_AD5660_2500,
+       ID_AD5660_1250,
+};
+
+#endif /* IIO_DAC_AD5446_H_ */