// SPDX-License-Identifier: GPL-2.0 /* * AD7280A Lithium Ion Battery Monitoring System * * Copyright 2011 Analog Devices Inc. */ #include <linux/bitfield.h> #include <linux/bits.h> #include <linux/cleanup.h> #include <linux/crc8.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/err.h> #include <linux/interrupt.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/mod_devicetable.h> #include <linux/mutex.h> #include <linux/slab.h> #include <linux/sysfs.h> #include <linux/spi/spi.h> #include <linux/iio/events.h> #include <linux/iio/iio.h> /* Registers */ #define AD7280A_CELL_VOLTAGE_1_REG … #define AD7280A_CELL_VOLTAGE_2_REG … #define AD7280A_CELL_VOLTAGE_3_REG … #define AD7280A_CELL_VOLTAGE_4_REG … #define AD7280A_CELL_VOLTAGE_5_REG … #define AD7280A_CELL_VOLTAGE_6_REG … #define AD7280A_AUX_ADC_1_REG … #define AD7280A_AUX_ADC_2_REG … #define AD7280A_AUX_ADC_3_REG … #define AD7280A_AUX_ADC_4_REG … #define AD7280A_AUX_ADC_5_REG … #define AD7280A_AUX_ADC_6_REG … #define AD7280A_SELF_TEST_REG … #define AD7280A_CTRL_HB_REG … #define AD7280A_CTRL_HB_CONV_INPUT_MSK … #define AD7280A_CTRL_HB_CONV_INPUT_ALL … #define AD7280A_CTRL_HB_CONV_INPUT_6CELL_AUX1_3_5 … #define AD7280A_CTRL_HB_CONV_INPUT_6CELL … #define AD7280A_CTRL_HB_CONV_INPUT_SELF_TEST … #define AD7280A_CTRL_HB_CONV_RREAD_MSK … #define AD7280A_CTRL_HB_CONV_RREAD_ALL … #define AD7280A_CTRL_HB_CONV_RREAD_6CELL_AUX1_3_5 … #define AD7280A_CTRL_HB_CONV_RREAD_6CELL … #define AD7280A_CTRL_HB_CONV_RREAD_NO … #define AD7280A_CTRL_HB_CONV_START_MSK … #define AD7280A_CTRL_HB_CONV_START_CNVST … #define AD7280A_CTRL_HB_CONV_START_CS … #define AD7280A_CTRL_HB_CONV_AVG_MSK … #define AD7280A_CTRL_HB_CONV_AVG_DIS … #define AD7280A_CTRL_HB_CONV_AVG_2 … #define AD7280A_CTRL_HB_CONV_AVG_4 … #define AD7280A_CTRL_HB_CONV_AVG_8 … #define AD7280A_CTRL_HB_PWRDN_SW … #define AD7280A_CTRL_LB_REG … #define AD7280A_CTRL_LB_SWRST_MSK … #define AD7280A_CTRL_LB_ACQ_TIME_MSK … #define AD7280A_CTRL_LB_ACQ_TIME_400ns … #define AD7280A_CTRL_LB_ACQ_TIME_800ns … #define AD7280A_CTRL_LB_ACQ_TIME_1200ns … #define AD7280A_CTRL_LB_ACQ_TIME_1600ns … #define AD7280A_CTRL_LB_MUST_SET … #define AD7280A_CTRL_LB_THERMISTOR_MSK … #define AD7280A_CTRL_LB_LOCK_DEV_ADDR_MSK … #define AD7280A_CTRL_LB_INC_DEV_ADDR_MSK … #define AD7280A_CTRL_LB_DAISY_CHAIN_RB_MSK … #define AD7280A_CELL_OVERVOLTAGE_REG … #define AD7280A_CELL_UNDERVOLTAGE_REG … #define AD7280A_AUX_ADC_OVERVOLTAGE_REG … #define AD7280A_AUX_ADC_UNDERVOLTAGE_REG … #define AD7280A_ALERT_REG … #define AD7280A_ALERT_REMOVE_MSK … #define AD7280A_ALERT_REMOVE_AUX5 … #define AD7280A_ALERT_REMOVE_AUX3_AUX5 … #define AD7280A_ALERT_REMOVE_VIN5 … #define AD7280A_ALERT_REMOVE_VIN4_VIN5 … #define AD7280A_ALERT_GEN_STATIC_HIGH … #define AD7280A_ALERT_RELAY_SIG_CHAIN_DOWN … #define AD7280A_CELL_BALANCE_REG … #define AD7280A_CELL_BALANCE_CHAN_BITMAP_MSK … #define AD7280A_CB1_TIMER_REG … #define AD7280A_CB_TIMER_VAL_MSK … #define AD7280A_CB2_TIMER_REG … #define AD7280A_CB3_TIMER_REG … #define AD7280A_CB4_TIMER_REG … #define AD7280A_CB5_TIMER_REG … #define AD7280A_CB6_TIMER_REG … #define AD7280A_PD_TIMER_REG … #define AD7280A_READ_REG … #define AD7280A_READ_ADDR_MSK … #define AD7280A_CNVST_CTRL_REG … /* Transfer fields */ #define AD7280A_TRANS_WRITE_DEVADDR_MSK … #define AD7280A_TRANS_WRITE_ADDR_MSK … #define AD7280A_TRANS_WRITE_VAL_MSK … #define AD7280A_TRANS_WRITE_ALL_MSK … #define AD7280A_TRANS_WRITE_CRC_MSK … #define AD7280A_TRANS_WRITE_RES_PATTERN … /* Layouts differ for channel vs other registers */ #define AD7280A_TRANS_READ_DEVADDR_MSK … #define AD7280A_TRANS_READ_CONV_CHANADDR_MSK … #define AD7280A_TRANS_READ_CONV_DATA_MSK … #define AD7280A_TRANS_READ_REG_REGADDR_MSK … #define AD7280A_TRANS_READ_REG_DATA_MSK … #define AD7280A_TRANS_READ_WRITE_ACK_MSK … #define AD7280A_TRANS_READ_CRC_MSK … /* Magic value used to indicate this special case */ #define AD7280A_ALL_CELLS … #define AD7280A_MAX_SPI_CLK_HZ … #define AD7280A_MAX_CHAIN … #define AD7280A_CELLS_PER_DEV … #define AD7280A_BITS … #define AD7280A_NUM_CH … #define AD7280A_CALC_VOLTAGE_CHAN_NUM(d, c) … #define AD7280A_CALC_TEMP_CHAN_NUM(d, c) … #define AD7280A_DEVADDR_MASTER … #define AD7280A_DEVADDR_ALL … static const unsigned short ad7280a_n_avg[4] = …; static const unsigned short ad7280a_t_acq_ns[4] = …; /* 5-bit device address is sent LSB first */ static unsigned int ad7280a_devaddr(unsigned int addr) { … } /* * During a read a valid write is mandatory. * So writing to the highest available address (Address 0x1F) and setting the * address all parts bit to 0 is recommended. * So the TXVAL is AD7280A_DEVADDR_ALL + CRC */ #define AD7280A_READ_TXVAL … /* * AD7280 CRC * * P(x) = x^8 + x^5 + x^3 + x^2 + x^1 + x^0 = 0b100101111 => 0x2F */ #define POLYNOM … struct ad7280_state { … }; static unsigned char ad7280_calc_crc8(unsigned char *crc_tab, unsigned int val) { … } static int ad7280_check_crc(struct ad7280_state *st, unsigned int val) { … } /* * After initiating a conversion sequence we need to wait until the conversion * is done. The delay is typically in the range of 15..30us however depending on * the number of devices in the daisy chain, the number of averages taken, * conversion delays and acquisition time options it may take up to 250us, in * this case we better sleep instead of busy wait. */ static void ad7280_delay(struct ad7280_state *st) { … } static int __ad7280_read32(struct ad7280_state *st, unsigned int *val) { … } static int ad7280_write(struct ad7280_state *st, unsigned int devaddr, unsigned int addr, bool all, unsigned int val) { … } static int ad7280_read_reg(struct ad7280_state *st, unsigned int devaddr, unsigned int addr) { … } static int ad7280_read_channel(struct ad7280_state *st, unsigned int devaddr, unsigned int addr) { … } static int ad7280_read_all_channels(struct ad7280_state *st, unsigned int cnt, unsigned int *array) { … } static void ad7280_sw_power_down(void *data) { … } static int ad7280_chain_setup(struct ad7280_state *st) { … } static ssize_t ad7280_show_balance_sw(struct iio_dev *indio_dev, uintptr_t private, const struct iio_chan_spec *chan, char *buf) { … } static ssize_t ad7280_store_balance_sw(struct iio_dev *indio_dev, uintptr_t private, const struct iio_chan_spec *chan, const char *buf, size_t len) { … } static ssize_t ad7280_show_balance_timer(struct iio_dev *indio_dev, uintptr_t private, const struct iio_chan_spec *chan, char *buf) { … } static ssize_t ad7280_store_balance_timer(struct iio_dev *indio_dev, uintptr_t private, const struct iio_chan_spec *chan, const char *buf, size_t len) { … } static const struct iio_chan_spec_ext_info ad7280_cell_ext_info[] = …; static const struct iio_event_spec ad7280_events[] = …; static void ad7280_voltage_channel_init(struct iio_chan_spec *chan, int i, bool irq_present) { … } static void ad7280_temp_channel_init(struct iio_chan_spec *chan, int i, bool irq_present) { … } static void ad7280_common_fields_init(struct iio_chan_spec *chan, int addr, int cnt) { … } static void ad7280_total_voltage_channel_init(struct iio_chan_spec *chan, int cnt, int dev) { … } static void ad7280_init_dev_channels(struct ad7280_state *st, int dev, int *cnt, bool irq_present) { … } static int ad7280_channel_init(struct ad7280_state *st, bool irq_present) { … } static int ad7280a_read_thresh(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, enum iio_event_type type, enum iio_event_direction dir, enum iio_event_info info, int *val, int *val2) { … } static int ad7280a_write_thresh(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, enum iio_event_type type, enum iio_event_direction dir, enum iio_event_info info, int val, int val2) { … } static irqreturn_t ad7280_event_handler(int irq, void *private) { … } static void ad7280_update_delay(struct ad7280_state *st) { … } static int ad7280_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long m) { … } static int ad7280_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) { … } static const struct iio_info ad7280_info = …; static const struct iio_info ad7280_info_no_irq = …; static int ad7280_probe(struct spi_device *spi) { … } static const struct spi_device_id ad7280_id[] = …; MODULE_DEVICE_TABLE(spi, ad7280_id); static struct spi_driver ad7280_driver = …; module_spi_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
Codebase Browser
linux