drivers/staging/iio/adc/max1363.h

#ifndef _MAX1363_H_
#define  _MAX1363_H_

#define MAX1363_SETUP_BYTE(a) ((a) | 0x80)

/* There is a fair bit more defined here than currently
 * used, but the intention is to support everything these
 * chips do in the long run */

/* see data sheets */
/* max1363 and max1236, max1237, max1238, max1239 */
#define MAX1363_SETUP_AIN3_IS_AIN3_REF_IS_VDD	0x00
#define MAX1363_SETUP_AIN3_IS_REF_EXT_TO_REF	0x20
#define MAX1363_SETUP_AIN3_IS_AIN3_REF_IS_INT	0x40
#define MAX1363_SETUP_AIN3_IS_REF_REF_IS_INT	0x60
#define MAX1363_SETUP_POWER_UP_INT_REF		0x10
#define MAX1363_SETUP_POWER_DOWN_INT_REF	0x00

/* think about includeing max11600 etc - more settings */
#define MAX1363_SETUP_EXT_CLOCK			0x08
#define MAX1363_SETUP_INT_CLOCK			0x00
#define MAX1363_SETUP_UNIPOLAR			0x00
#define MAX1363_SETUP_BIPOLAR			0x04
#define MAX1363_SETUP_RESET			0x00
#define MAX1363_SETUP_NORESET			0x02
/* max1363 only - though don't care on others.
 * For now monitor modes are not implemented as the relevant
 * line is not connected on my test board.
 * The definitions are here as I intend to add this soon.
 */
#define MAX1363_SETUP_MONITOR_SETUP		0x01

/* Specific to the max1363 */
#define MAX1363_MON_RESET_CHAN(a) (1 << ((a) + 4))
#define MAX1363_MON_CONV_RATE_133ksps		0
#define MAX1363_MON_CONV_RATE_66_5ksps		0x02
#define MAX1363_MON_CONV_RATE_33_3ksps		0x04
#define MAX1363_MON_CONV_RATE_16_6ksps		0x06
#define MAX1363_MON_CONV_RATE_8_3ksps		0x08
#define MAX1363_MON_CONV_RATE_4_2ksps		0x0A
#define MAX1363_MON_CONV_RATE_2_0ksps		0x0C
#define MAX1363_MON_CONV_RATE_1_0ksps		0x0E
#define MAX1363_MON_INT_ENABLE			0x01

/* defined for readability reasons */
/* All chips */
#define MAX1363_CONFIG_BYTE(a) ((a))

#define MAX1363_CONFIG_SE			0x01
#define MAX1363_CONFIG_DE			0x00
#define MAX1363_CONFIG_SCAN_TO_CS		0x00
#define MAX1363_CONFIG_SCAN_SINGLE_8		0x20
#define MAX1363_CONFIG_SCAN_MONITOR_MODE	0x40
#define MAX1363_CONFIG_SCAN_SINGLE_1		0x60
/* max123{6-9} only */
#define MAX1236_SCAN_MID_TO_CHANNEL		0x40

/* max1363 only - merely part of channel selects or don't care for others*/
#define MAX1363_CONFIG_EN_MON_MODE_READ 0x18

#define MAX1363_CHANNEL_SEL(a) ((a) << 1)

/* max1363 strictly 0x06 - but doesn't matter */
#define MAX1363_CHANNEL_SEL_MASK		0x1E
#define MAX1363_SCAN_MASK			0x60
#define MAX1363_SE_DE_MASK			0x01

/**
 * struct max1363_mode - scan mode information
 * @name:	Name used to identify the scan mode.
 * @conf:	The corresponding value of the configuration register
 * @numvals:	The number of values returned by a single scan
 */
struct max1363_mode {
	const char	*name;
	int8_t		conf;
	int		numvals;
};

#define MAX1363_MODE_SINGLE(_num) {					\
		.name = #_num,						\
			.conf = MAX1363_CHANNEL_SEL(_num)		\
			| MAX1363_CONFIG_SCAN_SINGLE_1			\
			| MAX1363_CONFIG_SE,				\
			.numvals = 1,					\
			}

#define MAX1363_MODE_SINGLE_TIMES_8(_num) {				\
		.name = #_num"x8",					\
			.conf = MAX1363_CHANNEL_SEL(_num)		\
			| MAX1363_CONFIG_SCAN_SINGLE_8			\
			| MAX1363_CONFIG_SE,				\
			.numvals = 8,					\
			}

#define MAX1363_MODE_SCAN_TO_CHANNEL(_num) {				\
		.name = "0..."#_num,					\
			.conf = MAX1363_CHANNEL_SEL(_num)		\
			| MAX1363_CONFIG_SCAN_TO_CS			\
			| MAX1363_CONFIG_SE,				\
			.numvals = _num + 1,				\
			}


/* note not available for max1363 hence naming */
#define MAX1236_MODE_SCAN_MID_TO_CHANNEL(_mid, _num) {			\
		.name = #_mid"..."#_num,				\
			.conf = MAX1363_CHANNEL_SEL(_num)		\
			| MAX1236_SCAN_MID_TO_CHANNEL			\
			| MAX1363_CONFIG_SE,				\
			.numvals = _num - _mid + 1			\
}

#define MAX1363_MODE_DIFF_SINGLE(_nump, _numm) {			\
		.name = #_nump"-"#_numm,				\
			.conf = MAX1363_CHANNEL_SEL(_nump)		\
			| MAX1363_CONFIG_SCAN_SINGLE_1			\
			| MAX1363_CONFIG_DE,				\
			.numvals = 1,					\
			}

#define MAX1363_MODE_DIFF_SINGLE_TIMES_8(_nump, _numm) {		\
		.name = #_nump"-"#_numm,				\
			.conf = MAX1363_CHANNEL_SEL(_nump)		\
			| MAX1363_CONFIG_SCAN_SINGLE_8			\
			| MAX1363_CONFIG_DE,				\
			.numvals = 1,					\
			}

/* Can't think how to automate naming so specify for now */
#define MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(_name, _num, _numvals) { \
		.name = #_name,						\
			.conf = MAX1363_CHANNEL_SEL(_num)		\
			| MAX1363_CONFIG_SCAN_TO_CS			\
			| MAX1363_CONFIG_DE,				\
			.numvals = _numvals,				\
			}

/* note only available for max1363 hence naming */
#define MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL_NAMED(_name, _num, _numvals) { \
    .name = #_name,							\
			.conf = MAX1363_CHANNEL_SEL(_num)		\
			| MAX1236_SCAN_MID_TO_CHANNEL			\
			| MAX1363_CONFIG_SE,				\
			.numvals = _numvals,				\
}

/* Not currently handled */
#define MAX1363_MODE_MONITOR {					\
		.name = "monitor",				\
			.conf = MAX1363_CHANNEL_SEL(3)		\
			| MAX1363_CONFIG_SCAN_MONITOR_MODE	\
			| MAX1363_CONFIG_SE,			\
			.numvals = 10,				\
		}

/* This may seem an overly long winded way to do this, but at least it makes
 * clear what all the various options actually do. Alternative suggestions
 * that don't require user to have intimate knowledge of the chip welcomed.
 */

/* This must be maintained along side the max1363_mode_table in max1363_core */
enum max1363_modes {
	/* Single read of a single channel */
	_s0, _s1, _s2, _s3, _s4, _s5, _s6, _s7, _s8, _s9, _s10, _s11,
	/* Eight reads of a single channel */
	se0, se1, se2, se3, se4, se5, se6, se7, se8, se9, se10, se11,
	/* Scan to channel */
	s0to1, s0to2, s0to3, s0to4, s0to5, s0to6,
	s0to7, s0to8, s0to9, s0to10, s0to11,
	/* Differential single read */
	d0m1, d2m3, d4m5, d6m7, d8m9, d10m11,
	d1m0, d3m2, d5m4, d7m6, d9m8, d11m10,
	/* Differential single read 8 times */
	de0m1, de2m3, de4m5, de6m7, de8m9, de10m11,
	de1m0, de3m2, de5m4, de7m6, de9m8, de11m10,
	/* Differential scan to channel */
	d0m1to2m3, d0m1to4m5, d0m1to6m7, d0m1to8m9, d0m1to10m11,
	d1m0to3m2, d1m0to5m4, d1m0to7m6, d1m0to9m8, d1m0to11m10,
	/* Scan mid to channel max123{6-9} only */
	s2to3, s6to7, s6to8, s6to9, s6to10, s6to11,
	/* Differential scan mid to channel */
	s6m7to8m9, s6m7to10m11, s7m6to9m8, s7m6to11m10,
};

/**
 * struct max1363_chip_info - chip specifc information
 * @name:		indentification string for chip
 * @num_inputs:		number of physical inputs on chip
 * @int_vref_mv:	the internal reference voltage
 * @monitor_mode:	whether the chip supports monitor interrupts
 * @mode_list:		array of available scan modes
 * @num_modes:		the number of scan modes available
 * @default_mode:	the scan mode in which the chip starts up
 */
struct max1363_chip_info {
	const char			*name;
	u8				num_inputs;
	u16				int_vref_mv;
	bool				monitor_mode;
	const enum max1363_modes	*mode_list;
	int				num_modes;
	enum max1363_modes		default_mode;
};


/**
 * struct max1363_state - driver instance specific data
 * @indio_dev:		the industrial I/O device
 * @client:		i2c_client
 * @setupbyte:		cache of current device setup byte
 * @configbyte:		cache of current device config byte
 * @chip_info:		chip model specific constants, available modes etc
 * @current_mode:	the scan mode of this chip
 * @poll_work:		bottom half of polling interrupt handler
 * @protect_ring:	used to ensure only one polling bh running at a time
 * @reg:		supply regulator
 */
struct max1363_state {
	struct iio_dev			*indio_dev;
	struct i2c_client		*client;
	char				setupbyte;
	char				configbyte;
	const struct max1363_chip_info	*chip_info;
	const struct max1363_mode	*current_mode;
	struct work_struct		poll_work;
	atomic_t			protect_ring;
	struct iio_trigger		*trig;
	struct regulator		*reg;
};
#ifdef CONFIG_IIO_RING_BUFFER

ssize_t max1363_scan_from_ring(struct device *dev,
			       struct device_attribute *attr,
			       char *buf);
int max1363_register_ring_funcs_and_init(struct iio_dev *indio_dev);
void max1363_ring_cleanup(struct iio_dev *indio_dev);

int max1363_initialize_ring(struct iio_ring_buffer *ring);
void max1363_uninitialize_ring(struct iio_ring_buffer *ring);

#else /* CONFIG_IIO_RING_BUFFER */

static inline void max1363_uninitialize_ring(struct iio_ring_buffer *ring)
{
};

static inline int max1363_initialize_ring(struct iio_ring_buffer *ring)
{
	return 0;
};


static inline ssize_t max1363_scan_from_ring(struct device *dev,
					     struct device_attribute *attr,
					     char *buf)
{
	return 0;
};

static inline int
max1363_register_ring_funcs_and_init(struct iio_dev *indio_dev)
{
	return 0;
};

static inline void max1363_ring_cleanup(struct iio_dev *indio_dev) {};
#endif /* CONFIG_IIO_RING_BUFFER */
#endif /* _MAX1363_H_ */