staging: IIO: DAC: New driver for the AD5504 and AD55041 High Voltage DACs

Changes since V1:

IIO: DAC: Apply review feedback from Jonathan

Fix array size and declare const.
Fix reversed dacY_powerdown read back.
Use individual attribute groups instead of is_visible.
Fix event naming and add the _en file.

Changes since V2:

IIO: DAC: AD5504 use proper event type
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/iio/dac/Kconfig

@@ -21,6 +21,16 @@ config AD5446
 	  To compile this driver as a module, choose M here: the
 	  module will be called ad5446.
 
+config AD5504
+	tristate "Analog Devices AD5504/AD5501 DAC SPI driver"
+	depends on SPI
+	help
+	  Say yes here to build support for Analog Devices AD5504, AD5501,
+	  High Voltage Digital to Analog Converter.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ad5504.
+
 config MAX517
 	tristate "Maxim MAX517/518/519 DAC driver"
 	depends on I2C && EXPERIMENTAL

drivers/staging/iio/dac/Makefile

@@ -3,5 +3,6 @@
 #
 
 obj-$(CONFIG_AD5624R_SPI) += ad5624r_spi.o
+obj-$(CONFIG_AD5504) += ad5504.o
 obj-$(CONFIG_AD5446) += ad5446.o
 obj-$(CONFIG_MAX517) += max517.o

drivers/staging/iio/dac/ad5504.h

+/*
+ * AD5504 SPI DAC driver
+ *
+ * Copyright 2011 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2.
+ */
+
+#ifndef SPI_AD5504_H_
+#define SPI_AD5504_H_
+
+#define AD5505_BITS			12
+#define AD5504_RES_MASK			((1 << (AD5505_BITS)) - 1)
+
+#define AD5504_CMD_READ			(1 << 15)
+#define AD5504_CMD_WRITE		(0 << 15)
+#define AD5504_ADDR(addr)		((addr) << 12)
+
+/* Registers */
+#define AD5504_ADDR_NOOP		0
+#define AD5504_ADDR_DAC0		1
+#define AD5504_ADDR_DAC1		2
+#define AD5504_ADDR_DAC2		3
+#define AD5504_ADDR_DAC3		4
+#define AD5504_ADDR_ALL_DAC		5
+#define AD5504_ADDR_CTRL		7
+
+/* Control Register */
+#define AD5504_DAC_PWR(ch)		((ch) << 2)
+#define AD5504_DAC_PWRDWN_MODE(mode)	((mode) << 6)
+#define AD5504_DAC_PWRDN_20K		0
+#define AD5504_DAC_PWRDN_3STATE		1
+
+/*
+ * TODO: struct ad5504_platform_data needs to go into include/linux/iio
+ */
+
+struct ad5504_platform_data {
+	u16				vref_mv;
+};
+
+/**
+ * struct ad5446_state - driver instance specific data
+ * @indio_dev:		the industrial I/O device
+ * @us:			spi_device
+ * @reg:		supply regulator
+ * @vref_mv:		actual reference voltage used
+ * @work_alarm:		bh work structure for event handling
+ * @last_timestamp:	timestamp of last event interrupt
+ * @pwr_down_mask	power down mask
+ * @pwr_down_mode	current power down mode
+ */
+
+struct ad5504_state {
+	struct iio_dev			*indio_dev;
+	struct spi_device		*spi;
+	struct regulator		*reg;
+	unsigned short			vref_mv;
+	struct work_struct		work_alarm;
+	s64				last_timestamp;
+	unsigned			pwr_down_mask;
+	unsigned			pwr_down_mode;
+};
+
+/**
+ * ad5504_supported_device_ids:
+ */
+
+enum ad5504_supported_device_ids {
+	ID_AD5504,
+	ID_AD5501,
+};
+
+#endif /* SPI_AD5504_H_ */

drivers/staging/iio/sysfs.h

@@ -266,6 +266,7 @@ struct iio_const_attr {
 #define IIO_EV_CLASS_MAGN		4
 #define IIO_EV_CLASS_LIGHT		5
 #define IIO_EV_CLASS_PROXIMITY		6
+#define IIO_EV_CLASS_TEMP		7
 
 #define IIO_EV_MOD_X			0
 #define IIO_EV_MOD_Y			1