diff options
Diffstat (limited to 'drivers/staging/iio/imu/adis16400_ring.c')
-rw-r--r-- | drivers/staging/iio/imu/adis16400_ring.c | 204 |
1 files changed, 0 insertions, 204 deletions
diff --git a/drivers/staging/iio/imu/adis16400_ring.c b/drivers/staging/iio/imu/adis16400_ring.c deleted file mode 100644 index d46c1e3..0000000 --- a/drivers/staging/iio/imu/adis16400_ring.c +++ /dev/null @@ -1,204 +0,0 @@ -#include <linux/interrupt.h> -#include <linux/mutex.h> -#include <linux/kernel.h> -#include <linux/spi/spi.h> -#include <linux/slab.h> -#include <linux/bitops.h> -#include <linux/export.h> - -#include <linux/iio/iio.h> -#include "../ring_sw.h" -#include <linux/iio/trigger_consumer.h> -#include "adis16400.h" - -/** - * adis16400_spi_read_burst() - read all data registers - * @indio_dev: the IIO device - * @rx: somewhere to pass back the value read (min size is 24 bytes) - **/ -static int adis16400_spi_read_burst(struct iio_dev *indio_dev, u8 *rx) -{ - struct spi_message msg; - struct adis16400_state *st = iio_priv(indio_dev); - u32 old_speed_hz = st->us->max_speed_hz; - int ret; - - struct spi_transfer xfers[] = { - { - .tx_buf = st->tx, - .bits_per_word = 8, - .len = 2, - }, { - .rx_buf = rx, - .bits_per_word = 8, - .len = 24, - }, - }; - - mutex_lock(&st->buf_lock); - st->tx[0] = ADIS16400_READ_REG(ADIS16400_GLOB_CMD); - st->tx[1] = 0; - - spi_message_init(&msg); - spi_message_add_tail(&xfers[0], &msg); - spi_message_add_tail(&xfers[1], &msg); - - st->us->max_speed_hz = min(ADIS16400_SPI_BURST, old_speed_hz); - spi_setup(st->us); - - ret = spi_sync(st->us, &msg); - if (ret) - dev_err(&st->us->dev, "problem when burst reading"); - - st->us->max_speed_hz = old_speed_hz; - spi_setup(st->us); - mutex_unlock(&st->buf_lock); - return ret; -} - -static const u16 read_all_tx_array[] = { - cpu_to_be16(ADIS16400_READ_REG(ADIS16400_SUPPLY_OUT)), - cpu_to_be16(ADIS16400_READ_REG(ADIS16400_XGYRO_OUT)), - cpu_to_be16(ADIS16400_READ_REG(ADIS16400_YGYRO_OUT)), - cpu_to_be16(ADIS16400_READ_REG(ADIS16400_ZGYRO_OUT)), - cpu_to_be16(ADIS16400_READ_REG(ADIS16400_XACCL_OUT)), - cpu_to_be16(ADIS16400_READ_REG(ADIS16400_YACCL_OUT)), - cpu_to_be16(ADIS16400_READ_REG(ADIS16400_ZACCL_OUT)), - cpu_to_be16(ADIS16400_READ_REG(ADIS16350_XTEMP_OUT)), - cpu_to_be16(ADIS16400_READ_REG(ADIS16350_YTEMP_OUT)), - cpu_to_be16(ADIS16400_READ_REG(ADIS16350_ZTEMP_OUT)), - cpu_to_be16(ADIS16400_READ_REG(ADIS16400_AUX_ADC)), -}; - -static int adis16350_spi_read_all(struct iio_dev *indio_dev, u8 *rx) -{ - struct adis16400_state *st = iio_priv(indio_dev); - - struct spi_message msg; - int i, j = 0, ret; - struct spi_transfer *xfers; - int scan_count = bitmap_weight(indio_dev->active_scan_mask, - indio_dev->masklength); - - xfers = kzalloc(sizeof(*xfers)*(scan_count + 1), - GFP_KERNEL); - if (xfers == NULL) - return -ENOMEM; - - for (i = 0; i < ARRAY_SIZE(read_all_tx_array); i++) - if (test_bit(i, indio_dev->active_scan_mask)) { - xfers[j].tx_buf = &read_all_tx_array[i]; - xfers[j].bits_per_word = 16; - xfers[j].len = 2; - xfers[j + 1].rx_buf = rx + j*2; - j++; - } - xfers[j].bits_per_word = 16; - xfers[j].len = 2; - - spi_message_init(&msg); - for (j = 0; j < scan_count + 1; j++) - spi_message_add_tail(&xfers[j], &msg); - - ret = spi_sync(st->us, &msg); - kfree(xfers); - - return ret; -} - -/* Whilst this makes a lot of calls to iio_sw_ring functions - it is to device - * specific to be rolled into the core. - */ -static irqreturn_t adis16400_trigger_handler(int irq, void *p) -{ - struct iio_poll_func *pf = p; - struct iio_dev *indio_dev = pf->indio_dev; - struct adis16400_state *st = iio_priv(indio_dev); - int i = 0, j, ret = 0; - s16 *data; - - /* Asumption that long is enough for maximum channels */ - unsigned long mask = *indio_dev->active_scan_mask; - int scan_count = bitmap_weight(indio_dev->active_scan_mask, - indio_dev->masklength); - data = kmalloc(indio_dev->scan_bytes, GFP_KERNEL); - if (data == NULL) { - dev_err(&st->us->dev, "memory alloc failed in ring bh"); - goto done; - } - - if (scan_count) { - if (st->variant->flags & ADIS16400_NO_BURST) { - ret = adis16350_spi_read_all(indio_dev, st->rx); - if (ret < 0) - goto done; - for (; i < scan_count; i++) - data[i] = *(s16 *)(st->rx + i*2); - } else { - ret = adis16400_spi_read_burst(indio_dev, st->rx); - if (ret < 0) - goto done; - for (; i < scan_count; i++) { - j = __ffs(mask); - mask &= ~(1 << j); - data[i] = be16_to_cpup( - (__be16 *)&(st->rx[j*2])); - } - } - } - /* Guaranteed to be aligned with 8 byte boundary */ - if (indio_dev->scan_timestamp) - *((s64 *)(data + ((i + 3)/4)*4)) = pf->timestamp; - iio_push_to_buffers(indio_dev, (u8 *) data); - -done: - kfree(data); - iio_trigger_notify_done(indio_dev->trig); - - return IRQ_HANDLED; -} - -void adis16400_unconfigure_ring(struct iio_dev *indio_dev) -{ - iio_dealloc_pollfunc(indio_dev->pollfunc); - iio_sw_rb_free(indio_dev->buffer); -} - -static const struct iio_buffer_setup_ops adis16400_ring_setup_ops = { - .preenable = &iio_sw_buffer_preenable, - .postenable = &iio_triggered_buffer_postenable, - .predisable = &iio_triggered_buffer_predisable, -}; - -int adis16400_configure_ring(struct iio_dev *indio_dev) -{ - int ret = 0; - struct iio_buffer *ring; - - ring = iio_sw_rb_allocate(indio_dev); - if (!ring) { - ret = -ENOMEM; - return ret; - } - indio_dev->buffer = ring; - ring->scan_timestamp = true; - indio_dev->setup_ops = &adis16400_ring_setup_ops; - - indio_dev->pollfunc = iio_alloc_pollfunc(&iio_pollfunc_store_time, - &adis16400_trigger_handler, - IRQF_ONESHOT, - indio_dev, - "%s_consumer%d", - indio_dev->name, - indio_dev->id); - if (indio_dev->pollfunc == NULL) { - ret = -ENOMEM; - goto error_iio_sw_rb_free; - } - - indio_dev->modes |= INDIO_BUFFER_TRIGGERED; - return 0; -error_iio_sw_rb_free: - iio_sw_rb_free(indio_dev->buffer); - return ret; -} |