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Diffstat (limited to 'drivers/iio/adc/ad7606.h')
| -rw-r--r-- | drivers/iio/adc/ad7606.h | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/drivers/iio/adc/ad7606.h b/drivers/iio/adc/ad7606.h new file mode 100644 index 000000000000..5d12410f68e1 --- /dev/null +++ b/drivers/iio/adc/ad7606.h @@ -0,0 +1,99 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * AD7606 ADC driver + * + * Copyright 2011 Analog Devices Inc. + */ + +#ifndef IIO_ADC_AD7606_H_ +#define IIO_ADC_AD7606_H_ + +/** + * struct ad7606_chip_info - chip specific information + * @channels: channel specification + * @num_channels: number of channels + * @has_oversampling: whether the device has oversampling support + */ +struct ad7606_chip_info { + const struct iio_chan_spec *channels; + unsigned int num_channels; + bool has_oversampling; +}; + +/** + * struct ad7606_state - driver instance specific data + * @dev pointer to kernel device + * @chip_info entry in the table of chips that describes this device + * @reg regulator info for the the power supply of the device + * @bops bus operations (SPI or parallel) + * @range voltage range selection, selects which scale to apply + * @oversampling oversampling selection + * @base_address address from where to read data in parallel operation + * @lock protect sensor state from concurrent accesses to GPIOs + * @gpio_convst GPIO descriptor for conversion start signal (CONVST) + * @gpio_reset GPIO descriptor for device hard-reset + * @gpio_range GPIO descriptor for range selection + * @gpio_standby GPIO descriptor for stand-by signal (STBY), + * controls power-down mode of device + * @gpio_frstdata GPIO descriptor for reading from device when data + * is being read on the first channel + * @gpio_os GPIO descriptors to control oversampling on the device + * @complete completion to indicate end of conversion + * @trig The IIO trigger associated with the device. + * @data buffer for reading data from the device + */ +struct ad7606_state { + struct device *dev; + const struct ad7606_chip_info *chip_info; + struct regulator *reg; + const struct ad7606_bus_ops *bops; + unsigned int range; + unsigned int oversampling; + void __iomem *base_address; + + struct mutex lock; /* protect sensor state */ + struct gpio_desc *gpio_convst; + struct gpio_desc *gpio_reset; + struct gpio_desc *gpio_range; + struct gpio_desc *gpio_standby; + struct gpio_desc *gpio_frstdata; + struct gpio_descs *gpio_os; + struct iio_trigger *trig; + struct completion completion; + + /* + * DMA (thus cache coherency maintenance) requires the + * transfer buffers to live in their own cache lines. + * 8 * 16-bit samples + 64-bit timestamp + */ + unsigned short data[12] ____cacheline_aligned; +}; + +/** + * struct ad7606_bus_ops - driver bus operations + * @read_block function pointer for reading blocks of data + */ +struct ad7606_bus_ops { + /* more methods added in future? */ + int (*read_block)(struct device *dev, int num, void *data); +}; + +int ad7606_probe(struct device *dev, int irq, void __iomem *base_address, + const char *name, unsigned int id, + const struct ad7606_bus_ops *bops); + +enum ad7606_supported_device_ids { + ID_AD7605_4, + ID_AD7606_8, + ID_AD7606_6, + ID_AD7606_4 +}; + +#ifdef CONFIG_PM_SLEEP +extern const struct dev_pm_ops ad7606_pm_ops; +#define AD7606_PM_OPS (&ad7606_pm_ops) +#else +#define AD7606_PM_OPS NULL +#endif + +#endif /* IIO_ADC_AD7606_H_ */ |