diff options
Diffstat (limited to 'drivers/iio/proximity/sx_common.h')
| -rw-r--r-- | drivers/iio/proximity/sx_common.h | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/drivers/iio/proximity/sx_common.h b/drivers/iio/proximity/sx_common.h new file mode 100644 index 000000000..5d3edeb75 --- /dev/null +++ b/drivers/iio/proximity/sx_common.h @@ -0,0 +1,157 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright 2021 Google LLC. + * + * Code shared between most Semtech SAR sensor driver. + */ + +#ifndef IIO_SX_COMMON_H +#define IIO_SX_COMMON_H + +#include <linux/iio/iio.h> +#include <linux/iio/types.h> +#include <linux/regulator/consumer.h> +#include <linux/types.h> + +struct device; +struct i2c_client; +struct regmap_config; +struct sx_common_data; + +#define SX_COMMON_REG_IRQ_SRC 0x00 + +#define SX_COMMON_MAX_NUM_CHANNELS 4 +static_assert(SX_COMMON_MAX_NUM_CHANNELS < BITS_PER_LONG); + +struct sx_common_reg_default { + u8 reg; + u8 def; +}; + +/** + * struct sx_common_ops: function pointers needed by common code + * + * List functions needed by common code to gather information or configure + * the sensor. + * + * @read_prox_data: Function to read raw proximity data. + * @check_whoami: Set device name based on whoami register. + * @init_compensation: Function to set initial compensation. + * @wait_for_sample: When there are no physical IRQ, function to wait for a + * sample to be ready. + * @get_default_reg: Populate the initial value for a given register. + */ +struct sx_common_ops { + int (*read_prox_data)(struct sx_common_data *data, + const struct iio_chan_spec *chan, __be16 *val); + int (*check_whoami)(struct device *dev, struct iio_dev *indio_dev); + int (*init_compensation)(struct iio_dev *indio_dev); + int (*wait_for_sample)(struct sx_common_data *data); + const struct sx_common_reg_default * + (*get_default_reg)(struct device *dev, int idx, + struct sx_common_reg_default *reg_def); +}; + +/** + * struct sx_common_chip_info: Semtech Sensor private chip information + * + * @reg_stat: Main status register address. + * @reg_irq_msk: IRQ mask register address. + * @reg_enable_chan: Address to enable/disable channels. + * Each phase presented by the sensor is an IIO channel.. + * @reg_reset: Reset register address. + * @mask_enable_chan: Mask over the channels bits in the enable channel + * register. + * @stat_offset: Offset to check phase status. + * @irq_msk_offset: Offset to enable interrupt in the IRQ mask + * register. + * @num_channels: Number of channels. + * @num_default_regs: Number of internal registers that can be configured. + * + * @ops: Private functions pointers. + * @iio_channels: Description of exposed iio channels. + * @num_iio_channels: Number of iio_channels. + * @iio_info: iio_info structure for this driver. + */ +struct sx_common_chip_info { + unsigned int reg_stat; + unsigned int reg_irq_msk; + unsigned int reg_enable_chan; + unsigned int reg_reset; + + unsigned int mask_enable_chan; + unsigned int stat_offset; + unsigned int irq_msk_offset; + unsigned int num_channels; + int num_default_regs; + + struct sx_common_ops ops; + + const struct iio_chan_spec *iio_channels; + int num_iio_channels; + struct iio_info iio_info; +}; + +/** + * struct sx_common_data: Semtech Sensor private data structure. + * + * @chip_info: Structure defining sensor internals. + * @mutex: Serialize access to registers and channel configuration. + * @completion: completion object to wait for data acquisition. + * @client: I2C client structure. + * @trig: IIO trigger object. + * @regmap: Register map. + * @num_default_regs: Number of default registers to set at init. + * @supplies: Power supplies object. + * @chan_prox_stat: Last reading of the proximity status for each channel. + * We only send an event to user space when this changes. + * @trigger_enabled: True when the device trigger is enabled. + * @buffer: Buffer to store raw samples. + * @suspend_ctrl: Remember enabled channels and sample rate during suspend. + * @chan_read: Bit field for each raw channel enabled. + * @chan_event: Bit field for each event enabled. + */ +struct sx_common_data { + const struct sx_common_chip_info *chip_info; + + struct mutex mutex; + struct completion completion; + struct i2c_client *client; + struct iio_trigger *trig; + struct regmap *regmap; + + struct regulator_bulk_data supplies[2]; + unsigned long chan_prox_stat; + bool trigger_enabled; + + /* Ensure correct alignment of timestamp when present. */ + struct { + __be16 channels[SX_COMMON_MAX_NUM_CHANNELS]; + s64 ts __aligned(8); + } buffer; + + unsigned int suspend_ctrl; + unsigned long chan_read; + unsigned long chan_event; +}; + +int sx_common_read_proximity(struct sx_common_data *data, + const struct iio_chan_spec *chan, int *val); + +int sx_common_read_event_config(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir); +int sx_common_write_event_config(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir, int state); + +int sx_common_probe(struct i2c_client *client, + const struct sx_common_chip_info *chip_info, + const struct regmap_config *regmap_config); + +/* 3 is the number of events defined by a single phase. */ +extern const struct iio_event_spec sx_common_events[3]; + +#endif /* IIO_SX_COMMON_H */ |