484a0bf091
Some of the newer generation devices from the ADIS16XXX series have more registers than what can be supported with the current register addressing scheme. These devices implement register paging to support a larger register range. Each page is 128 registers large and the currently active page can be selected via register 0x00 in each page. This patch implements transparent paging inside the common adis library. The register read/write interface stays the same and when a register is accessed the library automatically switches to the correct page if it is not already selected. The page number is encoded in the upper bits of the register number, e.g. register 0x5 of page 1 is 0x85. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
276 lines
6.6 KiB
C
276 lines
6.6 KiB
C
/*
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* Common library for ADIS16XXX devices
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*
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* Copyright 2012 Analog Devices Inc.
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* Author: Lars-Peter Clausen <lars@metafoo.de>
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*
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* Licensed under the GPL-2 or later.
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*/
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#ifndef __IIO_ADIS_H__
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#define __IIO_ADIS_H__
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#include <linux/spi/spi.h>
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#include <linux/interrupt.h>
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#include <linux/iio/types.h>
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#define ADIS_WRITE_REG(reg) ((0x80 | (reg)))
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#define ADIS_READ_REG(reg) ((reg) & 0x7f)
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#define ADIS_PAGE_SIZE 0x80
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#define ADIS_REG_PAGE_ID 0x00
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/**
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* struct adis_data - ADIS chip variant specific data
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* @read_delay: SPI delay for read operations in us
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* @write_delay: SPI delay for write operations in us
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* @glob_cmd_reg: Register address of the GLOB_CMD register
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* @msc_ctrl_reg: Register address of the MSC_CTRL register
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* @diag_stat_reg: Register address of the DIAG_STAT register
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* @status_error_msgs: Array of error messgaes
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* @status_error_mask:
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*/
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struct adis_data {
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unsigned int read_delay;
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unsigned int write_delay;
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unsigned int glob_cmd_reg;
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unsigned int msc_ctrl_reg;
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unsigned int diag_stat_reg;
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unsigned int self_test_mask;
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unsigned int startup_delay;
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const char * const *status_error_msgs;
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unsigned int status_error_mask;
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bool has_paging;
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};
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struct adis {
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struct spi_device *spi;
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struct iio_trigger *trig;
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const struct adis_data *data;
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struct mutex txrx_lock;
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struct spi_message msg;
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struct spi_transfer *xfer;
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unsigned int current_page;
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void *buffer;
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uint8_t tx[10] ____cacheline_aligned;
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uint8_t rx[4];
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};
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int adis_init(struct adis *adis, struct iio_dev *indio_dev,
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struct spi_device *spi, const struct adis_data *data);
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int adis_reset(struct adis *adis);
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int adis_write_reg(struct adis *adis, unsigned int reg,
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unsigned int val, unsigned int size);
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int adis_read_reg(struct adis *adis, unsigned int reg,
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unsigned int *val, unsigned int size);
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/**
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* adis_write_reg_8() - Write single byte to a register
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* @adis: The adis device
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* @reg: The address of the register to be written
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* @value: The value to write
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*/
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static inline int adis_write_reg_8(struct adis *adis, unsigned int reg,
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uint8_t val)
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{
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return adis_write_reg(adis, reg, val, 1);
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}
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/**
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* adis_write_reg_16() - Write 2 bytes to a pair of registers
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* @adis: The adis device
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* @reg: The address of the lower of the two registers
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* @value: Value to be written
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*/
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static inline int adis_write_reg_16(struct adis *adis, unsigned int reg,
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uint16_t val)
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{
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return adis_write_reg(adis, reg, val, 2);
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}
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/**
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* adis_write_reg_32() - write 4 bytes to four registers
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* @adis: The adis device
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* @reg: The address of the lower of the four register
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* @value: Value to be written
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*/
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static inline int adis_write_reg_32(struct adis *adis, unsigned int reg,
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uint32_t val)
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{
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return adis_write_reg(adis, reg, val, 4);
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}
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/**
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* adis_read_reg_16() - read 2 bytes from a 16-bit register
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* @adis: The adis device
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* @reg: The address of the lower of the two registers
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* @val: The value read back from the device
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*/
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static inline int adis_read_reg_16(struct adis *adis, unsigned int reg,
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uint16_t *val)
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{
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unsigned int tmp;
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int ret;
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ret = adis_read_reg(adis, reg, &tmp, 2);
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*val = tmp;
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return ret;
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}
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/**
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* adis_read_reg_32() - read 4 bytes from a 32-bit register
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* @adis: The adis device
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* @reg: The address of the lower of the two registers
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* @val: The value read back from the device
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*/
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static inline int adis_read_reg_32(struct adis *adis, unsigned int reg,
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uint32_t *val)
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{
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unsigned int tmp;
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int ret;
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ret = adis_read_reg(adis, reg, &tmp, 4);
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*val = tmp;
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return ret;
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}
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int adis_enable_irq(struct adis *adis, bool enable);
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int adis_check_status(struct adis *adis);
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int adis_initial_startup(struct adis *adis);
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int adis_single_conversion(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan, unsigned int error_mask,
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int *val);
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#define ADIS_VOLTAGE_CHAN(addr, si, chan, name, bits) { \
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.type = IIO_VOLTAGE, \
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.indexed = 1, \
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.channel = (chan), \
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.extend_name = name, \
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.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \
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IIO_CHAN_INFO_SCALE_SEPARATE_BIT, \
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.address = (addr), \
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.scan_index = (si), \
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.scan_type = { \
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.sign = 'u', \
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.realbits = (bits), \
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.storagebits = 16, \
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.endianness = IIO_BE, \
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}, \
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}
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#define ADIS_SUPPLY_CHAN(addr, si, bits) \
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ADIS_VOLTAGE_CHAN(addr, si, 0, "supply", bits)
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#define ADIS_AUX_ADC_CHAN(addr, si, bits) \
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ADIS_VOLTAGE_CHAN(addr, si, 1, NULL, bits)
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#define ADIS_TEMP_CHAN(addr, si, bits) { \
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.type = IIO_TEMP, \
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.indexed = 1, \
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.channel = 0, \
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.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \
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IIO_CHAN_INFO_SCALE_SEPARATE_BIT | \
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IIO_CHAN_INFO_OFFSET_SEPARATE_BIT, \
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.address = (addr), \
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.scan_index = (si), \
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.scan_type = { \
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.sign = 'u', \
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.realbits = (bits), \
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.storagebits = 16, \
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.endianness = IIO_BE, \
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}, \
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}
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#define ADIS_MOD_CHAN(_type, mod, addr, si, info, bits) { \
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.type = (_type), \
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.modified = 1, \
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.channel2 = IIO_MOD_ ## mod, \
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.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \
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IIO_CHAN_INFO_SCALE_SHARED_BIT | \
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info, \
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.address = (addr), \
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.scan_index = (si), \
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.scan_type = { \
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.sign = 's', \
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.realbits = (bits), \
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.storagebits = 16, \
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.endianness = IIO_BE, \
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}, \
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}
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#define ADIS_ACCEL_CHAN(mod, addr, si, info, bits) \
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ADIS_MOD_CHAN(IIO_ACCEL, mod, addr, si, info, bits)
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#define ADIS_GYRO_CHAN(mod, addr, si, info, bits) \
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ADIS_MOD_CHAN(IIO_ANGL_VEL, mod, addr, si, info, bits)
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#define ADIS_INCLI_CHAN(mod, addr, si, info, bits) \
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ADIS_MOD_CHAN(IIO_INCLI, mod, addr, si, info, bits)
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#define ADIS_ROT_CHAN(mod, addr, si, info, bits) \
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ADIS_MOD_CHAN(IIO_ROT, mod, addr, si, info, bits)
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#ifdef CONFIG_IIO_ADIS_LIB_BUFFER
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int adis_setup_buffer_and_trigger(struct adis *adis,
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struct iio_dev *indio_dev, irqreturn_t (*trigger_handler)(int, void *));
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void adis_cleanup_buffer_and_trigger(struct adis *adis,
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struct iio_dev *indio_dev);
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int adis_probe_trigger(struct adis *adis, struct iio_dev *indio_dev);
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void adis_remove_trigger(struct adis *adis);
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int adis_update_scan_mode(struct iio_dev *indio_dev,
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const unsigned long *scan_mask);
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#else /* CONFIG_IIO_BUFFER */
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static inline int adis_setup_buffer_and_trigger(struct adis *adis,
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struct iio_dev *indio_dev, irqreturn_t (*trigger_handler)(int, void *))
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{
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return 0;
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}
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static inline void adis_cleanup_buffer_and_trigger(struct adis *adis,
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struct iio_dev *indio_dev)
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{
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}
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static inline int adis_probe_trigger(struct adis *adis,
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struct iio_dev *indio_dev)
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{
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return 0;
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}
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static inline void adis_remove_trigger(struct adis *adis)
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{
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}
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#define adis_update_scan_mode NULL
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#endif /* CONFIG_IIO_BUFFER */
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#ifdef CONFIG_DEBUG_FS
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int adis_debugfs_reg_access(struct iio_dev *indio_dev,
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unsigned int reg, unsigned int writeval, unsigned int *readval);
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#else
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#define adis_debugfs_reg_access NULL
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#endif
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#endif
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