| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | #include <linux/interrupt.h> |
| 3 | #include <linux/mutex.h> |
| 4 | #include <linux/kernel.h> |
| 5 | #include <linux/spi/spi.h> |
| 6 | #include <linux/slab.h> |
| 7 | #include <linux/bitops.h> |
| 8 | #include <linux/export.h> |
| 9 | |
| 10 | #include <linux/iio/iio.h> |
| 11 | #include <linux/iio/buffer.h> |
| 12 | #include <linux/iio/triggered_buffer.h> |
| 13 | #include <linux/iio/trigger_consumer.h> |
| 14 | |
| 15 | #include "adis16400.h" |
| 16 | |
| 17 | int adis16400_update_scan_mode(struct iio_dev *indio_dev, |
| 18 | const unsigned long *scan_mask) |
| 19 | { |
| 20 | struct adis16400_state *st = iio_priv(indio_dev); |
| 21 | struct adis *adis = &st->adis; |
| 22 | unsigned int burst_length; |
| 23 | u8 *tx; |
| 24 | |
| 25 | if (st->variant->flags & ADIS16400_NO_BURST) |
| 26 | return adis_update_scan_mode(indio_dev, scan_mask); |
| 27 | |
| 28 | kfree(adis->xfer); |
| 29 | kfree(adis->buffer); |
| 30 | |
| 31 | /* All but the timestamp channel */ |
| 32 | burst_length = (indio_dev->num_channels - 1) * sizeof(u16); |
| 33 | if (st->variant->flags & ADIS16400_BURST_DIAG_STAT) |
| 34 | burst_length += sizeof(u16); |
| 35 | |
| 36 | adis->xfer = kcalloc(2, sizeof(*adis->xfer), GFP_KERNEL); |
| 37 | if (!adis->xfer) |
| 38 | return -ENOMEM; |
| 39 | |
| 40 | adis->buffer = kzalloc(burst_length + sizeof(u16), GFP_KERNEL); |
| 41 | if (!adis->buffer) |
| 42 | return -ENOMEM; |
| 43 | |
| 44 | tx = adis->buffer + burst_length; |
| 45 | tx[0] = ADIS_READ_REG(ADIS16400_GLOB_CMD); |
| 46 | tx[1] = 0; |
| 47 | |
| 48 | adis->xfer[0].tx_buf = tx; |
| 49 | adis->xfer[0].bits_per_word = 8; |
| 50 | adis->xfer[0].len = 2; |
| 51 | adis->xfer[1].rx_buf = adis->buffer; |
| 52 | adis->xfer[1].bits_per_word = 8; |
| 53 | adis->xfer[1].len = burst_length; |
| 54 | |
| 55 | spi_message_init(&adis->msg); |
| 56 | spi_message_add_tail(&adis->xfer[0], &adis->msg); |
| 57 | spi_message_add_tail(&adis->xfer[1], &adis->msg); |
| 58 | |
| 59 | return 0; |
| 60 | } |
| 61 | |
| 62 | irqreturn_t adis16400_trigger_handler(int irq, void *p) |
| 63 | { |
| 64 | struct iio_poll_func *pf = p; |
| 65 | struct iio_dev *indio_dev = pf->indio_dev; |
| 66 | struct adis16400_state *st = iio_priv(indio_dev); |
| 67 | struct adis *adis = &st->adis; |
| 68 | u32 old_speed_hz = st->adis.spi->max_speed_hz; |
| 69 | void *buffer; |
| 70 | int ret; |
| 71 | |
| 72 | if (!adis->buffer) |
| 73 | return -ENOMEM; |
| 74 | |
| 75 | if (!(st->variant->flags & ADIS16400_NO_BURST) && |
| 76 | st->adis.spi->max_speed_hz > ADIS16400_SPI_BURST) { |
| 77 | st->adis.spi->max_speed_hz = ADIS16400_SPI_BURST; |
| 78 | spi_setup(st->adis.spi); |
| 79 | } |
| 80 | |
| 81 | ret = spi_sync(adis->spi, &adis->msg); |
| 82 | if (ret) |
| 83 | dev_err(&adis->spi->dev, "Failed to read data: %d\n", ret); |
| 84 | |
| 85 | if (!(st->variant->flags & ADIS16400_NO_BURST)) { |
| 86 | st->adis.spi->max_speed_hz = old_speed_hz; |
| 87 | spi_setup(st->adis.spi); |
| 88 | } |
| 89 | |
| 90 | if (st->variant->flags & ADIS16400_BURST_DIAG_STAT) |
| 91 | buffer = adis->buffer + sizeof(u16); |
| 92 | else |
| 93 | buffer = adis->buffer; |
| 94 | |
| 95 | iio_push_to_buffers_with_timestamp(indio_dev, buffer, |
| 96 | pf->timestamp); |
| 97 | |
| 98 | iio_trigger_notify_done(indio_dev->trig); |
| 99 | |
| 100 | return IRQ_HANDLED; |
| 101 | } |