diff options
Diffstat (limited to 'drivers/staging/iio/adc/ad7298_ring.c')
-rw-r--r-- | drivers/staging/iio/adc/ad7298_ring.c | 113 |
1 files changed, 0 insertions, 113 deletions
diff --git a/drivers/staging/iio/adc/ad7298_ring.c b/drivers/staging/iio/adc/ad7298_ring.c deleted file mode 100644 index c2906a85fedb..000000000000 --- a/drivers/staging/iio/adc/ad7298_ring.c +++ /dev/null @@ -1,113 +0,0 @@ -/* - * AD7298 SPI ADC driver - * - * Copyright 2011-2012 Analog Devices Inc. - * - * Licensed under the GPL-2. - */ - -#include <linux/interrupt.h> -#include <linux/kernel.h> -#include <linux/slab.h> -#include <linux/spi/spi.h> - -#include <linux/iio/iio.h> -#include <linux/iio/buffer.h> -#include <linux/iio/trigger_consumer.h> -#include <linux/iio/triggered_buffer.h> - -#include "ad7298.h" - -/** - * ad7298_update_scan_mode() setup the spi transfer buffer for the new scan mask - **/ -int ad7298_update_scan_mode(struct iio_dev *indio_dev, - const unsigned long *active_scan_mask) -{ - struct ad7298_state *st = iio_priv(indio_dev); - int i, m; - unsigned short command; - int scan_count; - - /* Now compute overall size */ - scan_count = bitmap_weight(active_scan_mask, indio_dev->masklength); - - command = AD7298_WRITE | st->ext_ref; - - for (i = 0, m = AD7298_CH(0); i < AD7298_MAX_CHAN; i++, m >>= 1) - if (test_bit(i, active_scan_mask)) - command |= m; - - st->tx_buf[0] = cpu_to_be16(command); - - /* build spi ring message */ - st->ring_xfer[0].tx_buf = &st->tx_buf[0]; - st->ring_xfer[0].len = 2; - st->ring_xfer[0].cs_change = 1; - st->ring_xfer[1].tx_buf = &st->tx_buf[1]; - st->ring_xfer[1].len = 2; - st->ring_xfer[1].cs_change = 1; - - spi_message_init(&st->ring_msg); - spi_message_add_tail(&st->ring_xfer[0], &st->ring_msg); - spi_message_add_tail(&st->ring_xfer[1], &st->ring_msg); - - for (i = 0; i < scan_count; i++) { - st->ring_xfer[i + 2].rx_buf = &st->rx_buf[i]; - st->ring_xfer[i + 2].len = 2; - st->ring_xfer[i + 2].cs_change = 1; - spi_message_add_tail(&st->ring_xfer[i + 2], &st->ring_msg); - } - /* make sure last transfer cs_change is not set */ - st->ring_xfer[i + 1].cs_change = 0; - - return 0; -} - -/** - * ad7298_trigger_handler() bh of trigger launched polling to ring buffer - * - * Currently there is no option in this driver to disable the saving of - * timestamps within the ring. - **/ -static irqreturn_t ad7298_trigger_handler(int irq, void *p) -{ - struct iio_poll_func *pf = p; - struct iio_dev *indio_dev = pf->indio_dev; - struct ad7298_state *st = iio_priv(indio_dev); - s64 time_ns = 0; - __u16 buf[16]; - int b_sent, i; - - b_sent = spi_sync(st->spi, &st->ring_msg); - if (b_sent) - goto done; - - if (indio_dev->scan_timestamp) { - time_ns = iio_get_time_ns(); - memcpy((u8 *)buf + indio_dev->scan_bytes - sizeof(s64), - &time_ns, sizeof(time_ns)); - } - - for (i = 0; i < bitmap_weight(indio_dev->active_scan_mask, - indio_dev->masklength); i++) - buf[i] = be16_to_cpu(st->rx_buf[i]); - - iio_push_to_buffer(indio_dev->buffer, (u8 *)buf); - -done: - iio_trigger_notify_done(indio_dev->trig); - - return IRQ_HANDLED; -} - -int ad7298_register_ring_funcs_and_init(struct iio_dev *indio_dev) -{ - return iio_triggered_buffer_setup(indio_dev, NULL, - &ad7298_trigger_handler, NULL); -} - -void ad7298_ring_cleanup(struct iio_dev *indio_dev) -{ - iio_triggered_buffer_cleanup(indio_dev); -} |