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Commit 985dbe77 authored by Michael Hennerich's avatar Michael Hennerich Committed by Greg Kroah-Hartman
Browse files

staging: iio: adc: Enable driver support for ad799x AD converters 



Driver for ad7991, ad7995, ad7999, ad7992, ad7993, ad7994, ad7997 and
ad7998 multichannel ADC.

Signed-off-by: default avatarMichael Hennerich <michael.hennerich@analog.com>
Acked-by: default avatarJonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent e5558679

drivers/staging/iio/adc/Kconfig

+20 −0
Original line number Diff line number Diff line
@@ -26,3 +26,23 @@ config MAX1363_RING_BUFFER 
	help

	  Say yes here to include ring buffer support in the MAX1363

	  ADC driver.



config AD799X

	tristate "Analog Devices AD799x ADC driver"

	depends on I2C

	select IIO_TRIGGER if IIO_RING_BUFFER

	select AD799X_RING_BUFFER

	help

	  Say yes here to build support for Analog Devices:

	  ad7991, ad7995, ad7999, ad7992, ad7993, ad7994, ad7997, ad7998

	  i2c analog to digital convertors (ADC). Provides direct access

	  via sysfs.



config AD799X_RING_BUFFER

	bool "Analog Devices AD799x: use ring buffer"

	depends on AD799X

	select IIO_RING_BUFFER

	select IIO_SW_RING

	help

	  Say yes here to include ring buffer support in the AD799X

	  ADC driver.

drivers/staging/iio/adc/Makefile

+4 −0
Original line number Diff line number Diff line
@@ -6,3 +6,7 @@ max1363-y := max1363_core.o 
max1363-y += max1363_ring.o



obj-$(CONFIG_MAX1363) += max1363.o



ad799x-y := ad799x_core.o

ad799x-$(CONFIG_AD799X_RING_BUFFER) += ad799x_ring.o

obj-$(CONFIG_AD799X) += ad799x.o
 
 No newline at end of file

drivers/staging/iio/adc/ad799x.h

0 → 100644
+157 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2010 Michael Hennerich, Analog Devices Inc.

 * Copyright (C) 2008-2010 Jonathan Cameron

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 *

 * ad799x.h

 */



#ifndef _AD799X_H_

#define  _AD799X_H_



#define AD799X_CHANNEL_SHIFT			4



/*

 * AD7991, AD7995 and AD7999 defines

 */



#define AD7991_REF_SEL				0x08

#define AD7991_FLTR				0x04

#define AD7991_BIT_TRIAL_DELAY			0x02

#define AD7991_SAMPLE_DELAY			0x01



/*

 * AD7992, AD7993, AD7994, AD7997 and AD7998 defines

 */



#define AD7998_FLTR				0x08

#define AD7998_ALERT_EN				0x04

#define AD7998_BUSY_ALERT			0x02

#define AD7998_BUSY_ALERT_POL			0x01



#define AD7998_CONV_RES_REG			0x0

#define AD7998_ALERT_STAT_REG			0x1

#define AD7998_CONF_REG				0x2

#define AD7998_CYCLE_TMR_REG			0x3

#define AD7998_DATALOW_CH1_REG			0x4

#define AD7998_DATAHIGH_CH1_REG			0x5

#define AD7998_HYST_CH1_REG			0x6

#define AD7998_DATALOW_CH2_REG			0x7

#define AD7998_DATAHIGH_CH2_REG			0x8

#define AD7998_HYST_CH2_REG			0x9

#define AD7998_DATALOW_CH3_REG			0xA

#define AD7998_DATAHIGH_CH3_REG			0xB

#define AD7998_HYST_CH3_REG			0xC

#define AD7998_DATALOW_CH4_REG			0xD

#define AD7998_DATAHIGH_CH4_REG			0xE

#define AD7998_HYST_CH4_REG			0xF



#define AD7998_CYC_MASK				0x7

#define AD7998_CYC_DIS				0x0

#define AD7998_CYC_TCONF_32			0x1

#define AD7998_CYC_TCONF_64			0x2

#define AD7998_CYC_TCONF_128			0x3

#define AD7998_CYC_TCONF_256			0x4

#define AD7998_CYC_TCONF_512			0x5

#define AD7998_CYC_TCONF_1024			0x6

#define AD7998_CYC_TCONF_2048			0x7



#define AD7998_ALERT_STAT_CLEAR			0xFF



/*

 * AD7997 and AD7997 defines

 */



#define AD7997_8_READ_SINGLE			0x80

#define AD7997_8_READ_SEQUENCE			0x70



enum {

	ad7991,

	ad7995,

	ad7999,

	ad7992,

	ad7993,

	ad7994,

	ad7997,

	ad7998

};



struct ad799x_state;



/**

 * struct ad799x_chip_info - chip specifc information

 * @num_inputs:		number of physical inputs on chip

 * @bits:		accuracy of the adc in bits

 * @int_vref_mv:	the internal reference voltage

 * @monitor_mode:	whether the chip supports monitor interrupts

 * @default_config:	device default configuration

 * @dev_attrs:		pointer to the device attribute group

 * @scan_attrs:		pointer to the scan element attribute group

 * @event_attrs:	pointer to the monitor event attribute group

 * @ad799x_set_scan_mode: function pointer to the device specific mode function



 */

struct ad799x_chip_info {

	u8				num_inputs;

	u8				bits;

	u16				int_vref_mv;

	bool				monitor_mode;

	u16				default_config;

	struct attribute_group		*dev_attrs;

	struct attribute_group		*scan_attrs;

	struct attribute_group		*event_attrs;

	int (*ad799x_set_scan_mode)	(struct ad799x_state *st,

					unsigned mask);

};



struct ad799x_state {

	struct iio_dev			*indio_dev;

	struct i2c_client		*client;

	const struct ad799x_chip_info	*chip_info;

	struct work_struct		poll_work;

	struct work_struct		work_thresh;

	atomic_t			protect_ring;

	struct iio_trigger		*trig;

	struct regulator		*reg;

	s64				last_timestamp;

	u16				int_vref_mv;

	unsigned			id;

	char				*name;

	u16				config;

};



/*

 * TODO: struct ad799x_platform_data needs to go into inlude/linux/iio

 */



struct ad799x_platform_data {

	u16				vref_mv;

};



int ad799x_set_scan_mode(struct ad799x_state *st, unsigned mask);



#ifdef CONFIG_AD799X_RING_BUFFER

int ad799x_single_channel_from_ring(struct ad799x_state *st, long mask);

int ad799x_register_ring_funcs_and_init(struct iio_dev *indio_dev);

void ad799x_ring_cleanup(struct iio_dev *indio_dev);

#else /* CONFIG_AD799X_RING_BUFFER */

int ad799x_single_channel_from_ring(struct ad799x_state *st, long mask)

{

	return -EINVAL;

}





static inline int

ad799x_register_ring_funcs_and_init(struct iio_dev *indio_dev)

{

	return 0;

}



static inline void ad799x_ring_cleanup(struct iio_dev *indio_dev)

{

}

#endif /* CONFIG_AD799X_RING_BUFFER */

#endif /* _AD799X_H_ */