/*
 * Common library for ADIS16XXX devices
 *
 * Copyright 2012 Analog Devices Inc.
 *   Author: Lars-Peter Clausen <lars@metafoo.de>
 *
 * Licensed under the GPL-2 or later.
 */

#ifndef __IIO_ADIS_H__
#define __IIO_ADIS_H__

#include <linux/spi/spi.h>
#include <linux/interrupt.h>
#include <linux/iio/types.h>

#define ADIS_WRITE_REG(reg) ((0x80 | (reg)))
#define ADIS_READ_REG(reg) ((reg) & 0x7f)

#define ADIS_PAGE_SIZE 0x80
#define ADIS_REG_PAGE_ID 0x00

struct adis;

/**
 * struct adis_data - ADIS chip variant specific data
 * @read_delay: SPI delay for read operations in us
 * @write_delay: SPI delay for write operations in us
 * @glob_cmd_reg: Register address of the GLOB_CMD register
 * @msc_ctrl_reg: Register address of the MSC_CTRL register
 * @diag_stat_reg: Register address of the DIAG_STAT register
 * @status_error_msgs: Array of error messgaes
 * @status_error_mask:
 */
struct adis_data {
        unsigned int read_delay;
        unsigned int write_delay;

        unsigned int glob_cmd_reg;
        unsigned int msc_ctrl_reg;
        unsigned int diag_stat_reg;

        unsigned int self_test_mask;
        unsigned int startup_delay;

        const char * const *status_error_msgs;
        unsigned int status_error_mask;

        int (*enable_irq)(struct adis *adis, bool enable);

        bool has_paging;
};

struct adis {
        struct spi_device       *spi;
        struct iio_trigger      *trig;

        const struct adis_data  *data;

        struct mutex            txrx_lock;
        struct spi_message      msg;
        struct spi_transfer     *xfer;
        unsigned int            current_page;
        void                    *buffer;

        uint8_t                 tx[10] ____cacheline_aligned;
        uint8_t                 rx[4];
};

int adis_init(struct adis *adis, struct iio_dev *indio_dev,
        struct spi_device *spi, const struct adis_data *data);
int adis_reset(struct adis *adis);

int adis_write_reg(struct adis *adis, unsigned int reg,
        unsigned int val, unsigned int size);
int adis_read_reg(struct adis *adis, unsigned int reg,
        unsigned int *val, unsigned int size);

/**
 * adis_write_reg_8() - Write single byte to a register
 * @adis: The adis device
 * @reg: The address of the register to be written
 * @value: The value to write
 */
static inline int adis_write_reg_8(struct adis *adis, unsigned int reg,
        uint8_t val)
{
        return adis_write_reg(adis, reg, val, 1);
}

/**
 * adis_write_reg_16() - Write 2 bytes to a pair of registers
 * @adis: The adis device
 * @reg: The address of the lower of the two registers
 * @value: Value to be written
 */
static inline int adis_write_reg_16(struct adis *adis, unsigned int reg,
        uint16_t val)
{
        return adis_write_reg(adis, reg, val, 2);
}

/**
 * adis_write_reg_32() - write 4 bytes to four registers
 * @adis: The adis device
 * @reg: The address of the lower of the four register
 * @value: Value to be written
 */
static inline int adis_write_reg_32(struct adis *adis, unsigned int reg,
        uint32_t val)
{
        return adis_write_reg(adis, reg, val, 4);
}

/**
 * adis_read_reg_16() - read 2 bytes from a 16-bit register
 * @adis: The adis device
 * @reg: The address of the lower of the two registers
 * @val: The value read back from the device
 */
static inline int adis_read_reg_16(struct adis *adis, unsigned int reg,
        uint16_t *val)
{
        unsigned int tmp;
        int ret;

        ret = adis_read_reg(adis, reg, &tmp, 2);
        *val = tmp;

        return ret;
}

/**
 * adis_read_reg_32() - read 4 bytes from a 32-bit register
 * @adis: The adis device
 * @reg: The address of the lower of the two registers
 * @val: The value read back from the device
 */
static inline int adis_read_reg_32(struct adis *adis, unsigned int reg,
        uint32_t *val)
{
        unsigned int tmp;
        int ret;

        ret = adis_read_reg(adis, reg, &tmp, 4);
        *val = tmp;

        return ret;
}

int adis_enable_irq(struct adis *adis, bool enable);
int adis_check_status(struct adis *adis);

int adis_initial_startup(struct adis *adis);

int adis_single_conversion(struct iio_dev *indio_dev,
        const struct iio_chan_spec *chan, unsigned int error_mask,
        int *val);

#define ADIS_VOLTAGE_CHAN(addr, si, chan, name, info_all, bits) { \
        .type = IIO_VOLTAGE, \
        .indexed = 1, \
        .channel = (chan), \
        .extend_name = name, \
        .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
                BIT(IIO_CHAN_INFO_SCALE), \
        .info_mask_shared_by_all = info_all, \
        .address = (addr), \
        .scan_index = (si), \
        .scan_type = { \
                .sign = 'u', \
                .realbits = (bits), \
                .storagebits = 16, \
                .endianness = IIO_BE, \
        }, \
}

#define ADIS_SUPPLY_CHAN(addr, si, info_all, bits) \
        ADIS_VOLTAGE_CHAN(addr, si, 0, "supply", info_all, bits)

#define ADIS_AUX_ADC_CHAN(addr, si, info_all, bits) \
        ADIS_VOLTAGE_CHAN(addr, si, 1, NULL, info_all, bits)

#define ADIS_TEMP_CHAN(addr, si, info_all, bits) { \
        .type = IIO_TEMP, \
        .indexed = 1, \
        .channel = 0, \
        .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
                BIT(IIO_CHAN_INFO_SCALE) | \
                BIT(IIO_CHAN_INFO_OFFSET), \
        .info_mask_shared_by_all = info_all, \
        .address = (addr), \
        .scan_index = (si), \
        .scan_type = { \
                .sign = 'u', \
                .realbits = (bits), \
                .storagebits = 16, \
                .endianness = IIO_BE, \
        }, \
}

#define ADIS_MOD_CHAN(_type, mod, addr, si, info_sep, info_all, bits) { \
        .type = (_type), \
        .modified = 1, \
        .channel2 = IIO_MOD_ ## mod, \
        .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
                 info_sep, \
        .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
        .info_mask_shared_by_all = info_all, \
        .address = (addr), \
        .scan_index = (si), \
        .scan_type = { \
                .sign = 's', \
                .realbits = (bits), \
                .storagebits = 16, \
                .endianness = IIO_BE, \
        }, \
}

#define ADIS_ACCEL_CHAN(mod, addr, si, info_sep, info_all, bits) \
        ADIS_MOD_CHAN(IIO_ACCEL, mod, addr, si, info_sep, info_all, bits)

#define ADIS_GYRO_CHAN(mod, addr, si, info_sep, info_all, bits)         \
        ADIS_MOD_CHAN(IIO_ANGL_VEL, mod, addr, si, info_sep, info_all, bits)

#define ADIS_INCLI_CHAN(mod, addr, si, info_sep, info_all, bits) \
        ADIS_MOD_CHAN(IIO_INCLI, mod, addr, si, info_sep, info_all, bits)

#define ADIS_ROT_CHAN(mod, addr, si, info_sep, info_all, bits) \
        ADIS_MOD_CHAN(IIO_ROT, mod, addr, si, info_sep, info_all, bits)

#ifdef CONFIG_IIO_ADIS_LIB_BUFFER

int adis_setup_buffer_and_trigger(struct adis *adis,
        struct iio_dev *indio_dev, irqreturn_t (*trigger_handler)(int, void *));
void adis_cleanup_buffer_and_trigger(struct adis *adis,
        struct iio_dev *indio_dev);

int adis_probe_trigger(struct adis *adis, struct iio_dev *indio_dev);
void adis_remove_trigger(struct adis *adis);

int adis_update_scan_mode(struct iio_dev *indio_dev,
        const unsigned long *scan_mask);

#else /* CONFIG_IIO_BUFFER */

static inline int adis_setup_buffer_and_trigger(struct adis *adis,
        struct iio_dev *indio_dev, irqreturn_t (*trigger_handler)(int, void *))
{
        return 0;
}

static inline void adis_cleanup_buffer_and_trigger(struct adis *adis,
        struct iio_dev *indio_dev)
{
}

static inline int adis_probe_trigger(struct adis *adis,
        struct iio_dev *indio_dev)
{
        return 0;
}

static inline void adis_remove_trigger(struct adis *adis)
{
}

#define adis_update_scan_mode NULL

#endif /* CONFIG_IIO_BUFFER */

#ifdef CONFIG_DEBUG_FS

int adis_debugfs_reg_access(struct iio_dev *indio_dev,
        unsigned int reg, unsigned int writeval, unsigned int *readval);

#else

#define adis_debugfs_reg_access NULL

#endif

#endif