mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 13:55:32 +00:00
![Alexandru Ardelean](/assets/img/avatar_default.png)
Since all AD Sigma-Delta drivers now use the devm_ad_sd_setup_buffer_and_trigger() function, we can remove the old ad_sd_{setup,cleanup}_buffer_and_trigger() functions. This way we can discourage new drivers that use the ad_sigma_delta lib-driver to use these (older functions). Signed-off-by: Alexandru Ardelean <aardelean@deviqon.com> Link: https://lore.kernel.org/r/20210513120752.90074-13-aardelean@deviqon.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
140 lines
4.3 KiB
C
140 lines
4.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* Support code for Analog Devices Sigma-Delta ADCs
|
|
*
|
|
* Copyright 2012 Analog Devices Inc.
|
|
* Author: Lars-Peter Clausen <lars@metafoo.de>
|
|
*/
|
|
#ifndef __AD_SIGMA_DELTA_H__
|
|
#define __AD_SIGMA_DELTA_H__
|
|
|
|
enum ad_sigma_delta_mode {
|
|
AD_SD_MODE_CONTINUOUS = 0,
|
|
AD_SD_MODE_SINGLE = 1,
|
|
AD_SD_MODE_IDLE = 2,
|
|
AD_SD_MODE_POWERDOWN = 3,
|
|
};
|
|
|
|
/**
|
|
* struct ad_sigma_delta_calib_data - Calibration data for Sigma Delta devices
|
|
* @mode: Calibration mode.
|
|
* @channel: Calibration channel.
|
|
*/
|
|
struct ad_sd_calib_data {
|
|
unsigned int mode;
|
|
unsigned int channel;
|
|
};
|
|
|
|
struct ad_sigma_delta;
|
|
struct device;
|
|
struct iio_dev;
|
|
|
|
/**
|
|
* struct ad_sigma_delta_info - Sigma Delta driver specific callbacks and options
|
|
* @set_channel: Will be called to select the current channel, may be NULL.
|
|
* @set_mode: Will be called to select the current mode, may be NULL.
|
|
* @postprocess_sample: Is called for each sampled data word, can be used to
|
|
* modify or drop the sample data, it, may be NULL.
|
|
* @has_registers: true if the device has writable and readable registers, false
|
|
* if there is just one read-only sample data shift register.
|
|
* @addr_shift: Shift of the register address in the communications register.
|
|
* @read_mask: Mask for the communications register having the read bit set.
|
|
* @data_reg: Address of the data register, if 0 the default address of 0x3 will
|
|
* be used.
|
|
* @irq_flags: flags for the interrupt used by the triggered buffer
|
|
*/
|
|
struct ad_sigma_delta_info {
|
|
int (*set_channel)(struct ad_sigma_delta *, unsigned int channel);
|
|
int (*set_mode)(struct ad_sigma_delta *, enum ad_sigma_delta_mode mode);
|
|
int (*postprocess_sample)(struct ad_sigma_delta *, unsigned int raw_sample);
|
|
bool has_registers;
|
|
unsigned int addr_shift;
|
|
unsigned int read_mask;
|
|
unsigned int data_reg;
|
|
unsigned long irq_flags;
|
|
};
|
|
|
|
/**
|
|
* struct ad_sigma_delta - Sigma Delta device struct
|
|
* @spi: The spi device associated with the Sigma Delta device.
|
|
* @trig: The IIO trigger associated with the Sigma Delta device.
|
|
*
|
|
* Most of the fields are private to the sigma delta library code and should not
|
|
* be accessed by individual drivers.
|
|
*/
|
|
struct ad_sigma_delta {
|
|
struct spi_device *spi;
|
|
struct iio_trigger *trig;
|
|
|
|
/* private: */
|
|
struct completion completion;
|
|
bool irq_dis;
|
|
|
|
bool bus_locked;
|
|
bool keep_cs_asserted;
|
|
|
|
uint8_t comm;
|
|
|
|
const struct ad_sigma_delta_info *info;
|
|
|
|
/*
|
|
* DMA (thus cache coherency maintenance) requires the
|
|
* transfer buffers to live in their own cache lines.
|
|
* 'tx_buf' is up to 32 bits.
|
|
* 'rx_buf' is up to 32 bits per sample + 64 bit timestamp,
|
|
* rounded to 16 bytes to take into account padding.
|
|
*/
|
|
uint8_t tx_buf[4] ____cacheline_aligned;
|
|
uint8_t rx_buf[16] __aligned(8);
|
|
};
|
|
|
|
static inline int ad_sigma_delta_set_channel(struct ad_sigma_delta *sd,
|
|
unsigned int channel)
|
|
{
|
|
if (sd->info->set_channel)
|
|
return sd->info->set_channel(sd, channel);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int ad_sigma_delta_set_mode(struct ad_sigma_delta *sd,
|
|
unsigned int mode)
|
|
{
|
|
if (sd->info->set_mode)
|
|
return sd->info->set_mode(sd, mode);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int ad_sigma_delta_postprocess_sample(struct ad_sigma_delta *sd,
|
|
unsigned int raw_sample)
|
|
{
|
|
if (sd->info->postprocess_sample)
|
|
return sd->info->postprocess_sample(sd, raw_sample);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void ad_sd_set_comm(struct ad_sigma_delta *sigma_delta, uint8_t comm);
|
|
int ad_sd_write_reg(struct ad_sigma_delta *sigma_delta, unsigned int reg,
|
|
unsigned int size, unsigned int val);
|
|
int ad_sd_read_reg(struct ad_sigma_delta *sigma_delta, unsigned int reg,
|
|
unsigned int size, unsigned int *val);
|
|
|
|
int ad_sd_reset(struct ad_sigma_delta *sigma_delta,
|
|
unsigned int reset_length);
|
|
|
|
int ad_sigma_delta_single_conversion(struct iio_dev *indio_dev,
|
|
const struct iio_chan_spec *chan, int *val);
|
|
int ad_sd_calibrate(struct ad_sigma_delta *sigma_delta,
|
|
unsigned int mode, unsigned int channel);
|
|
int ad_sd_calibrate_all(struct ad_sigma_delta *sigma_delta,
|
|
const struct ad_sd_calib_data *cd, unsigned int n);
|
|
int ad_sd_init(struct ad_sigma_delta *sigma_delta, struct iio_dev *indio_dev,
|
|
struct spi_device *spi, const struct ad_sigma_delta_info *info);
|
|
|
|
int devm_ad_sd_setup_buffer_and_trigger(struct device *dev, struct iio_dev *indio_dev);
|
|
|
|
int ad_sd_validate_trigger(struct iio_dev *indio_dev, struct iio_trigger *trig);
|
|
|
|
#endif
|