// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (c) 2012-2016, The Linux Foundation. All rights reserved. */ #include <linux/bitops.h> #include <linux/completion.h> #include <linux/delay.h> #include <linux/err.h> #include <linux/iio/adc/qcom-vadc-common.h> #include <linux/iio/iio.h> #include <linux/interrupt.h> #include <linux/kernel.h> #include <linux/math64.h> #include <linux/module.h> #include <linux/mod_devicetable.h> #include <linux/platform_device.h> #include <linux/property.h> #include <linux/regmap.h> #include <linux/slab.h> #include <linux/log2.h> #include <dt-bindings/iio/qcom,spmi-vadc.h> /* VADC register and bit definitions */ #define VADC_REVISION2 … #define VADC_REVISION2_SUPPORTED_VADC … #define VADC_PERPH_TYPE … #define VADC_PERPH_TYPE_ADC … #define VADC_PERPH_SUBTYPE … #define VADC_PERPH_SUBTYPE_VADC … #define VADC_STATUS1 … #define VADC_STATUS1_OP_MODE … #define VADC_STATUS1_REQ_STS … #define VADC_STATUS1_EOC … #define VADC_STATUS1_REQ_STS_EOC_MASK … #define VADC_MODE_CTL … #define VADC_OP_MODE_SHIFT … #define VADC_OP_MODE_NORMAL … #define VADC_AMUX_TRIM_EN … #define VADC_ADC_TRIM_EN … #define VADC_EN_CTL1 … #define VADC_EN_CTL1_SET … #define VADC_ADC_CH_SEL_CTL … #define VADC_ADC_DIG_PARAM … #define VADC_ADC_DIG_DEC_RATIO_SEL_SHIFT … #define VADC_HW_SETTLE_DELAY … #define VADC_CONV_REQ … #define VADC_CONV_REQ_SET … #define VADC_FAST_AVG_CTL … #define VADC_FAST_AVG_EN … #define VADC_FAST_AVG_EN_SET … #define VADC_ACCESS … #define VADC_ACCESS_DATA … #define VADC_PERH_RESET_CTL3 … #define VADC_FOLLOW_WARM_RB … #define VADC_DATA … #define VADC_CHAN_MIN … #define VADC_CHAN_MAX … /** * struct vadc_channel_prop - VADC channel property. * @channel: channel number, refer to the channel list. * @calibration: calibration type. * @decimation: sampling rate supported for the channel. * @prescale: channel scaling performed on the input signal. * @hw_settle_time: the time between AMUX being configured and the * start of conversion. * @avg_samples: ability to provide single result from the ADC * that is an average of multiple measurements. * @scale_fn_type: Represents the scaling function to convert voltage * physical units desired by the client for the channel. * @channel_name: Channel name used in device tree. */ struct vadc_channel_prop { … }; /** * struct vadc_priv - VADC private structure. * @regmap: pointer to struct regmap. * @dev: pointer to struct device. * @base: base address for the ADC peripheral. * @nchannels: number of VADC channels. * @chan_props: array of VADC channel properties. * @iio_chans: array of IIO channels specification. * @are_ref_measured: are reference points measured. * @poll_eoc: use polling instead of interrupt. * @complete: VADC result notification after interrupt is received. * @graph: store parameters for calibration. * @lock: ADC lock for access to the peripheral. */ struct vadc_priv { … }; static const struct u32_fract vadc_prescale_ratios[] = …; static int vadc_read(struct vadc_priv *vadc, u16 offset, u8 *data) { … } static int vadc_write(struct vadc_priv *vadc, u16 offset, u8 data) { … } static int vadc_reset(struct vadc_priv *vadc) { … } static int vadc_set_state(struct vadc_priv *vadc, bool state) { … } static void vadc_show_status(struct vadc_priv *vadc) { … } static int vadc_configure(struct vadc_priv *vadc, struct vadc_channel_prop *prop) { … } static int vadc_poll_wait_eoc(struct vadc_priv *vadc, unsigned int interval_us) { … } static int vadc_read_result(struct vadc_priv *vadc, u16 *data) { … } static struct vadc_channel_prop *vadc_get_channel(struct vadc_priv *vadc, unsigned int num) { … } static int vadc_do_conversion(struct vadc_priv *vadc, struct vadc_channel_prop *prop, u16 *data) { … } static int vadc_measure_ref_points(struct vadc_priv *vadc) { … } static int vadc_prescaling_from_dt(u32 numerator, u32 denominator) { … } static int vadc_hw_settle_time_from_dt(u32 value) { … } static int vadc_avg_samples_from_dt(u32 value) { … } static int vadc_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { … } static int vadc_fwnode_xlate(struct iio_dev *indio_dev, const struct fwnode_reference_args *iiospec) { … } static int vadc_read_label(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, char *label) { … } static const struct iio_info vadc_info = …; struct vadc_channels { … }; #define VADC_CHAN(_dname, _type, _mask, _pre, _scale) … \ #define VADC_NO_CHAN(_dname, _type, _mask, _pre) … #define VADC_CHAN_TEMP(_dname, _pre, _scale) … \ #define VADC_CHAN_VOLT(_dname, _pre, _scale) … \ #define VADC_CHAN_NO_SCALE(_dname, _pre) … \ /* * The array represents all possible ADC channels found in the supported PMICs. * Every index in the array is equal to the channel number per datasheet. The * gaps in the array should be treated as reserved channels. */ static const struct vadc_channels vadc_chans[] = …; static int vadc_get_fw_channel_data(struct device *dev, struct vadc_channel_prop *prop, struct fwnode_handle *fwnode) { … } static int vadc_get_fw_data(struct vadc_priv *vadc) { … } static irqreturn_t vadc_isr(int irq, void *dev_id) { … } static int vadc_check_revision(struct vadc_priv *vadc) { … } static int vadc_probe(struct platform_device *pdev) { … } static const struct of_device_id vadc_match_table[] = …; MODULE_DEVICE_TABLE(of, vadc_match_table); static struct platform_driver vadc_driver = …; module_platform_driver(…) …; MODULE_ALIAS(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; MODULE_AUTHOR(…) …; MODULE_AUTHOR(…) …;
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