// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2017 Tony Lindgren <[email protected]> * * Rewritten for Linux IIO framework with some code based on * earlier driver found in the Motorola Linux kernel: * * Copyright (C) 2009-2010 Motorola, Inc. */ #include <linux/delay.h> #include <linux/device.h> #include <linux/err.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/kernel.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/iio/buffer.h> #include <linux/iio/driver.h> #include <linux/iio/iio.h> #include <linux/iio/kfifo_buf.h> #include <linux/mfd/motorola-cpcap.h> /* Register CPCAP_REG_ADCC1 bits */ #define CPCAP_BIT_ADEN_AUTO_CLR … #define CPCAP_BIT_CAL_MODE … #define CPCAP_BIT_ADC_CLK_SEL1 … #define CPCAP_BIT_ADC_CLK_SEL0 … #define CPCAP_BIT_ATOX … #define CPCAP_BIT_ATO3 … #define CPCAP_BIT_ATO2 … #define CPCAP_BIT_ATO1 … #define CPCAP_BIT_ATO0 … #define CPCAP_BIT_ADA2 … #define CPCAP_BIT_ADA1 … #define CPCAP_BIT_ADA0 … #define CPCAP_BIT_AD_SEL1 … #define CPCAP_BIT_RAND1 … #define CPCAP_BIT_RAND0 … #define CPCAP_BIT_ADEN … #define CPCAP_REG_ADCC1_DEFAULTS … /* Register CPCAP_REG_ADCC2 bits */ #define CPCAP_BIT_CAL_FACTOR_ENABLE … #define CPCAP_BIT_BATDETB_EN … #define CPCAP_BIT_ADTRIG_ONESHOT … #define CPCAP_BIT_ASC … #define CPCAP_BIT_ATOX_PS_FACTOR … #define CPCAP_BIT_ADC_PS_FACTOR1 … #define CPCAP_BIT_ADC_PS_FACTOR0 … #define CPCAP_BIT_AD4_SELECT … #define CPCAP_BIT_ADC_BUSY … #define CPCAP_BIT_THERMBIAS_EN … #define CPCAP_BIT_ADTRIG_DIS … #define CPCAP_BIT_LIADC … #define CPCAP_BIT_TS_REFEN … #define CPCAP_BIT_TS_M2 … #define CPCAP_BIT_TS_M1 … #define CPCAP_BIT_TS_M0 … #define CPCAP_REG_ADCC2_DEFAULTS … #define CPCAP_MAX_TEMP_LVL … #define CPCAP_FOUR_POINT_TWO_ADC … #define ST_ADC_CAL_CHRGI_HIGH_THRESHOLD … #define ST_ADC_CAL_CHRGI_LOW_THRESHOLD … #define ST_ADC_CAL_BATTI_HIGH_THRESHOLD … #define ST_ADC_CAL_BATTI_LOW_THRESHOLD … #define ST_ADC_CALIBRATE_DIFF_THRESHOLD … #define CPCAP_ADC_MAX_RETRIES … /* * struct cpcap_adc_ato - timing settings for cpcap adc * * Unfortunately no cpcap documentation available, please document when * using these. */ struct cpcap_adc_ato { … }; /** * struct cpcap_adc - cpcap adc device driver data * @reg: cpcap regmap * @dev: struct device * @vendor: cpcap vendor * @irq: interrupt * @lock: mutex * @ato: request timings * @wq_data_avail: work queue * @done: work done */ struct cpcap_adc { … }; /* * enum cpcap_adc_channel - cpcap adc channels */ enum cpcap_adc_channel { … }; /* * enum cpcap_adc_timing - cpcap adc timing options * * CPCAP_ADC_TIMING_IMM seems to be immediate with no timings. * Please document when using. */ enum cpcap_adc_timing { … }; /** * struct cpcap_adc_phasing_tbl - cpcap phasing table * @offset: offset in the phasing table * @multiplier: multiplier in the phasing table * @divider: divider in the phasing table * @min: minimum value * @max: maximum value */ struct cpcap_adc_phasing_tbl { … }; /** * struct cpcap_adc_conversion_tbl - cpcap conversion table * @conv_type: conversion type * @align_offset: align offset * @conv_offset: conversion offset * @cal_offset: calibration offset * @multiplier: conversion multiplier * @divider: conversion divider */ struct cpcap_adc_conversion_tbl { … }; /** * struct cpcap_adc_request - cpcap adc request * @channel: request channel * @phase_tbl: channel phasing table * @conv_tbl: channel conversion table * @bank_index: channel index within the bank * @timing: timing settings * @result: result */ struct cpcap_adc_request { … }; /* Phasing table for channels. Note that channels 16 & 17 use BATTP and BATTI */ static const struct cpcap_adc_phasing_tbl bank_phasing[] = …; /* * Conversion table for channels. Updated during init based on calibration. * Here too channels 16 & 17 use BATTP and BATTI. */ static struct cpcap_adc_conversion_tbl bank_conversion[] = …; /* * Temperature lookup table of register values to milliCelcius. * REVISIT: Check the duplicate 0x3ff entry in a freezer */ static const int temp_map[CPCAP_MAX_TEMP_LVL][2] = …; #define CPCAP_CHAN(_type, _index, _address, _datasheet_name) … /* * The datasheet names are from Motorola mapphone Linux kernel except * for the last two which might be uncalibrated charge voltage and * current. */ static const struct iio_chan_spec cpcap_adc_channels[] = …; static irqreturn_t cpcap_adc_irq_thread(int irq, void *data) { … } /* ADC calibration functions */ static void cpcap_adc_setup_calibrate(struct cpcap_adc *ddata, enum cpcap_adc_channel chan) { … } static int cpcap_adc_calibrate_one(struct cpcap_adc *ddata, int channel, u16 calibration_register, int lower_threshold, int upper_threshold) { … } static int cpcap_adc_calibrate(struct cpcap_adc *ddata) { … } /* ADC setup, read and scale functions */ static void cpcap_adc_setup_bank(struct cpcap_adc *ddata, struct cpcap_adc_request *req) { … } static int cpcap_adc_start_bank(struct cpcap_adc *ddata, struct cpcap_adc_request *req) { … } static int cpcap_adc_stop_bank(struct cpcap_adc *ddata) { … } static void cpcap_adc_phase(struct cpcap_adc_request *req) { … } /* Looks up temperatures in a table and calculates averages if needed */ static int cpcap_adc_table_to_millicelcius(unsigned short value) { … } static void cpcap_adc_convert(struct cpcap_adc_request *req) { … } /* * REVISIT: Check if timed sampling can use multiple channels at the * same time. If not, replace channel_mask with just channel. */ static int cpcap_adc_read_bank_scaled(struct cpcap_adc *ddata, struct cpcap_adc_request *req) { … } static int cpcap_adc_init_request(struct cpcap_adc_request *req, int channel) { … } static int cpcap_adc_read_st_die_temp(struct cpcap_adc *ddata, int addr, int *val) { … } static int cpcap_adc_read(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { … } static const struct iio_info cpcap_adc_info = …; /* * Configuration for Motorola mapphone series such as droid 4. * Copied from the Motorola mapphone kernel tree. */ static const struct cpcap_adc_ato mapphone_adc = …; static const struct of_device_id cpcap_adc_id_table[] = …; MODULE_DEVICE_TABLE(of, cpcap_adc_id_table); static int cpcap_adc_probe(struct platform_device *pdev) { … } static struct platform_driver cpcap_adc_driver = …; module_platform_driver(…) …; MODULE_ALIAS(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …;
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