// SPDX-License-Identifier: GPL-2.0-only /* * Aspeed AST2400/2500/2600 ADC * * Copyright (C) 2017 Google, Inc. * Copyright (C) 2021 Aspeed Technology Inc. * * ADC clock formula: * Ast2400/Ast2500: * clock period = period of PCLK * 2 * (ADC0C[31:17] + 1) * (ADC0C[9:0] + 1) * Ast2600: * clock period = period of PCLK * 2 * (ADC0C[15:0] + 1) */ #include <linux/clk.h> #include <linux/clk-provider.h> #include <linux/err.h> #include <linux/errno.h> #include <linux/io.h> #include <linux/module.h> #include <linux/of_platform.h> #include <linux/platform_device.h> #include <linux/regulator/consumer.h> #include <linux/reset.h> #include <linux/spinlock.h> #include <linux/types.h> #include <linux/bitfield.h> #include <linux/regmap.h> #include <linux/mfd/syscon.h> #include <linux/iio/iio.h> #include <linux/iio/driver.h> #include <linux/iopoll.h> #define ASPEED_RESOLUTION_BITS … #define ASPEED_CLOCKS_PER_SAMPLE … #define ASPEED_REG_ENGINE_CONTROL … #define ASPEED_REG_INTERRUPT_CONTROL … #define ASPEED_REG_VGA_DETECT_CONTROL … #define ASPEED_REG_CLOCK_CONTROL … #define ASPEED_REG_COMPENSATION_TRIM … /* * The register offset between 0xC8~0xCC can be read and won't affect the * hardware logic in each version of ADC. */ #define ASPEED_REG_MAX … #define ASPEED_ADC_ENGINE_ENABLE … #define ASPEED_ADC_OP_MODE … #define ASPEED_ADC_OP_MODE_PWR_DOWN … #define ASPEED_ADC_OP_MODE_STANDBY … #define ASPEED_ADC_OP_MODE_NORMAL … #define ASPEED_ADC_CTRL_COMPENSATION … #define ASPEED_ADC_AUTO_COMPENSATION … /* * Bit 6 determines not only the reference voltage range but also the dividing * circuit for battery sensing. */ #define ASPEED_ADC_REF_VOLTAGE … #define ASPEED_ADC_REF_VOLTAGE_2500mV … #define ASPEED_ADC_REF_VOLTAGE_1200mV … #define ASPEED_ADC_REF_VOLTAGE_EXT_HIGH … #define ASPEED_ADC_REF_VOLTAGE_EXT_LOW … #define ASPEED_ADC_BAT_SENSING_DIV … #define ASPEED_ADC_BAT_SENSING_DIV_2_3 … #define ASPEED_ADC_BAT_SENSING_DIV_1_3 … #define ASPEED_ADC_CTRL_INIT_RDY … #define ASPEED_ADC_CH7_MODE … #define ASPEED_ADC_CH7_NORMAL … #define ASPEED_ADC_CH7_BAT … #define ASPEED_ADC_BAT_SENSING_ENABLE … #define ASPEED_ADC_CTRL_CHANNEL … #define ASPEED_ADC_CTRL_CHANNEL_ENABLE(ch) … #define ASPEED_ADC_INIT_POLLING_TIME … #define ASPEED_ADC_INIT_TIMEOUT … /* * When the sampling rate is too high, the ADC may not have enough charging * time, resulting in a low voltage value. Thus, the default uses a slow * sampling rate for most use cases. */ #define ASPEED_ADC_DEF_SAMPLING_RATE … struct aspeed_adc_trim_locate { … }; struct aspeed_adc_model_data { … }; struct adc_gain { … }; struct aspeed_adc_data { … }; #define ASPEED_CHAN(_idx, _data_reg_addr) … static const struct iio_chan_spec aspeed_adc_iio_channels[] = …; #define ASPEED_BAT_CHAN(_idx, _data_reg_addr) … static const struct iio_chan_spec aspeed_adc_iio_bat_channels[] = …; static int aspeed_adc_set_trim_data(struct iio_dev *indio_dev) { … } static int aspeed_adc_compensation(struct iio_dev *indio_dev) { … } static int aspeed_adc_set_sampling_rate(struct iio_dev *indio_dev, u32 rate) { … } static int aspeed_adc_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { … } static int aspeed_adc_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) { … } static int aspeed_adc_reg_access(struct iio_dev *indio_dev, unsigned int reg, unsigned int writeval, unsigned int *readval) { … } static const struct iio_info aspeed_adc_iio_info = …; static void aspeed_adc_unregister_fixed_divider(void *data) { … } static void aspeed_adc_reset_assert(void *data) { … } static void aspeed_adc_clk_disable_unprepare(void *data) { … } static void aspeed_adc_power_down(void *data) { … } static int aspeed_adc_vref_config(struct iio_dev *indio_dev) { … } static int aspeed_adc_probe(struct platform_device *pdev) { … } static const struct aspeed_adc_trim_locate ast2500_adc_trim = …; static const struct aspeed_adc_trim_locate ast2600_adc0_trim = …; static const struct aspeed_adc_trim_locate ast2600_adc1_trim = …; static const struct aspeed_adc_model_data ast2400_model_data = …; static const struct aspeed_adc_model_data ast2500_model_data = …; static const struct aspeed_adc_model_data ast2600_adc0_model_data = …; static const struct aspeed_adc_model_data ast2600_adc1_model_data = …; static const struct of_device_id aspeed_adc_matches[] = …; MODULE_DEVICE_TABLE(of, aspeed_adc_matches); static struct platform_driver aspeed_adc_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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