1#include <linux/interrupt.h> 2#include <linux/mutex.h> 3#include <linux/kernel.h> 4#include <linux/spi/spi.h> 5#include <linux/slab.h> 6#include <linux/bitops.h> 7#include <linux/export.h> 8 9#include <linux/iio/iio.h> 10#include <linux/iio/buffer.h> 11#include <linux/iio/triggered_buffer.h> 12#include <linux/iio/trigger_consumer.h> 13 14#include "adis16400.h" 15 16int adis16400_update_scan_mode(struct iio_dev *indio_dev, 17 const unsigned long *scan_mask) 18{ 19 struct adis16400_state *st = iio_priv(indio_dev); 20 struct adis *adis = &st->adis; 21 unsigned int burst_length; 22 u8 *tx; 23 24 if (st->variant->flags & ADIS16400_NO_BURST) 25 return adis_update_scan_mode(indio_dev, scan_mask); 26 27 kfree(adis->xfer); 28 kfree(adis->buffer); 29 30 /* All but the timestamp channel */ 31 burst_length = (indio_dev->num_channels - 1) * sizeof(u16); 32 if (st->variant->flags & ADIS16400_BURST_DIAG_STAT) 33 burst_length += sizeof(u16); 34 35 adis->xfer = kcalloc(2, sizeof(*adis->xfer), GFP_KERNEL); 36 if (!adis->xfer) 37 return -ENOMEM; 38 39 adis->buffer = kzalloc(burst_length + sizeof(u16), GFP_KERNEL); 40 if (!adis->buffer) 41 return -ENOMEM; 42 43 tx = adis->buffer + burst_length; 44 tx[0] = ADIS_READ_REG(ADIS16400_GLOB_CMD); 45 tx[1] = 0; 46 47 adis->xfer[0].tx_buf = tx; 48 adis->xfer[0].bits_per_word = 8; 49 adis->xfer[0].len = 2; 50 adis->xfer[1].rx_buf = adis->buffer; 51 adis->xfer[1].bits_per_word = 8; 52 adis->xfer[1].len = burst_length; 53 54 spi_message_init(&adis->msg); 55 spi_message_add_tail(&adis->xfer[0], &adis->msg); 56 spi_message_add_tail(&adis->xfer[1], &adis->msg); 57 58 return 0; 59} 60 61irqreturn_t adis16400_trigger_handler(int irq, void *p) 62{ 63 struct iio_poll_func *pf = p; 64 struct iio_dev *indio_dev = pf->indio_dev; 65 struct adis16400_state *st = iio_priv(indio_dev); 66 struct adis *adis = &st->adis; 67 u32 old_speed_hz = st->adis.spi->max_speed_hz; 68 void *buffer; 69 int ret; 70 71 if (!adis->buffer) 72 return -ENOMEM; 73 74 if (!(st->variant->flags & ADIS16400_NO_BURST) && 75 st->adis.spi->max_speed_hz > ADIS16400_SPI_BURST) { 76 st->adis.spi->max_speed_hz = ADIS16400_SPI_BURST; 77 spi_setup(st->adis.spi); 78 } 79 80 ret = spi_sync(adis->spi, &adis->msg); 81 if (ret) 82 dev_err(&adis->spi->dev, "Failed to read data: %d\n", ret); 83 84 if (!(st->variant->flags & ADIS16400_NO_BURST)) { 85 st->adis.spi->max_speed_hz = old_speed_hz; 86 spi_setup(st->adis.spi); 87 } 88 89 if (st->variant->flags & ADIS16400_BURST_DIAG_STAT) 90 buffer = adis->buffer + sizeof(u16); 91 else 92 buffer = adis->buffer; 93 94 iio_push_to_buffers_with_timestamp(indio_dev, buffer, 95 pf->timestamp); 96 97 iio_trigger_notify_done(indio_dev->trig); 98 99 return IRQ_HANDLED; 100} 101