diff options
Diffstat (limited to 'include/linux/iio/adc/ad_sigma_delta.h')
| -rw-r--r-- | include/linux/iio/adc/ad_sigma_delta.h | 27 |
1 files changed, 22 insertions, 5 deletions
diff --git a/include/linux/iio/adc/ad_sigma_delta.h b/include/linux/iio/adc/ad_sigma_delta.h index f242b285081b..6e70a412e218 100644 --- a/include/linux/iio/adc/ad_sigma_delta.h +++ b/include/linux/iio/adc/ad_sigma_delta.h @@ -31,6 +31,8 @@ struct ad_sigma_delta; struct device; struct gpio_desc; struct iio_dev; +struct spi_offload; +struct spi_offload_trigger; /** * struct ad_sigma_delta_info - Sigma Delta driver specific callbacks and options @@ -47,6 +49,10 @@ struct iio_dev; * @has_registers: true if the device has writable and readable registers, false * if there is just one read-only sample data shift register. * @has_named_irqs: Set to true if there is more than one IRQ line. + * @supports_spi_offload: Set to true if the driver supports SPI offload. Often + * special considerations are needed for scan_type and other channel + * info, so individual drivers have to set this to let the core + * code know that it can use SPI offload if it is available. * @addr_shift: Shift of the register address in the communications register. * @read_mask: Mask for the communications register having the read bit set. * @status_ch_mask: Mask for the channel number stored in status register. @@ -65,6 +71,7 @@ struct ad_sigma_delta_info { int (*postprocess_sample)(struct ad_sigma_delta *, unsigned int raw_sample); bool has_registers; bool has_named_irqs; + bool supports_spi_offload; unsigned int addr_shift; unsigned int read_mask; unsigned int status_ch_mask; @@ -94,7 +101,7 @@ struct ad_sigma_delta { bool bus_locked; bool keep_cs_asserted; - uint8_t comm; + u8 comm; const struct ad_sigma_delta_info *info; unsigned int active_slots; @@ -105,7 +112,11 @@ struct ad_sigma_delta { bool status_appended; /* map slots to channels in order to know what to expect from devices */ unsigned int *slots; - uint8_t *samples_buf; + struct spi_message sample_msg; + struct spi_transfer sample_xfer[2]; + u8 *samples_buf; + struct spi_offload *offload; + struct spi_offload_trigger *offload_trigger; /* * DMA (thus cache coherency maintenance) requires the @@ -114,10 +125,16 @@ struct ad_sigma_delta { * 'rx_buf' is up to 32 bits per sample + 64 bit timestamp, * rounded to 16 bytes to take into account padding. */ - uint8_t tx_buf[4] __aligned(IIO_DMA_MINALIGN); - uint8_t rx_buf[16] __aligned(8); + u8 tx_buf[4] __aligned(IIO_DMA_MINALIGN); + u8 rx_buf[16] __aligned(8); + u8 sample_addr; }; +static inline bool ad_sigma_delta_has_spi_offload(struct ad_sigma_delta *sd) +{ + return sd->offload != NULL; +} + static inline int ad_sigma_delta_set_channel(struct ad_sigma_delta *sd, unsigned int channel) { @@ -177,7 +194,7 @@ static inline int ad_sigma_delta_postprocess_sample(struct ad_sigma_delta *sd, return 0; } -void ad_sd_set_comm(struct ad_sigma_delta *sigma_delta, uint8_t comm); +void ad_sd_set_comm(struct ad_sigma_delta *sigma_delta, u8 comm); int ad_sd_write_reg(struct ad_sigma_delta *sigma_delta, unsigned int reg, unsigned int size, unsigned int val); int ad_sd_read_reg(struct ad_sigma_delta *sigma_delta, unsigned int reg, |