Barry Song | a9d26f0 | 2010-05-04 14:43:15 +0100 | [diff] [blame] | 1 | #include <linux/interrupt.h> |
Barry Song | a9d26f0 | 2010-05-04 14:43:15 +0100 | [diff] [blame] | 2 | #include <linux/mutex.h> |
Barry Song | a9d26f0 | 2010-05-04 14:43:15 +0100 | [diff] [blame] | 3 | #include <linux/kernel.h> |
| 4 | #include <linux/spi/spi.h> |
Mike Frysinger | 1cb6c1f | 2010-05-23 03:10:35 -0400 | [diff] [blame] | 5 | #include <linux/slab.h> |
Jonathan Cameron | 2a29a90 | 2011-05-18 14:41:28 +0100 | [diff] [blame] | 6 | #include <linux/bitops.h> |
Paul Gortmaker | 8e336a7 | 2011-07-10 13:09:12 -0400 | [diff] [blame] | 7 | #include <linux/export.h> |
Barry Song | a9d26f0 | 2010-05-04 14:43:15 +0100 | [diff] [blame] | 8 | |
Jonathan Cameron | 06458e2 | 2012-04-25 15:54:58 +0100 | [diff] [blame] | 9 | #include <linux/iio/iio.h> |
Lars-Peter Clausen | 1ffe2e7 | 2013-01-16 12:48:00 +0000 | [diff] [blame] | 10 | #include <linux/iio/buffer.h> |
| 11 | #include <linux/iio/triggered_buffer.h> |
Jonathan Cameron | 06458e2 | 2012-04-25 15:54:58 +0100 | [diff] [blame] | 12 | #include <linux/iio/trigger_consumer.h> |
Lars-Peter Clausen | cd888a17 | 2013-01-16 12:48:00 +0000 | [diff] [blame] | 13 | |
Barry Song | a9d26f0 | 2010-05-04 14:43:15 +0100 | [diff] [blame] | 14 | #include "adis16400.h" |
| 15 | |
Lars-Peter Clausen | 5eda355 | 2013-01-16 12:48:00 +0000 | [diff] [blame^] | 16 | int adis16400_update_scan_mode(struct iio_dev *indio_dev, |
| 17 | const unsigned long *scan_mask) |
Jonathan Cameron | 2a29a90 | 2011-05-18 14:41:28 +0100 | [diff] [blame] | 18 | { |
Jonathan Cameron | 38d15f0 | 2011-05-18 14:42:23 +0100 | [diff] [blame] | 19 | struct adis16400_state *st = iio_priv(indio_dev); |
Lars-Peter Clausen | 5eda355 | 2013-01-16 12:48:00 +0000 | [diff] [blame^] | 20 | struct adis *adis = &st->adis; |
| 21 | uint16_t *tx, *rx; |
Jonathan Cameron | 2a29a90 | 2011-05-18 14:41:28 +0100 | [diff] [blame] | 22 | |
Lars-Peter Clausen | 5eda355 | 2013-01-16 12:48:00 +0000 | [diff] [blame^] | 23 | if (st->variant->flags & ADIS16400_NO_BURST) |
| 24 | return adis_update_scan_mode(indio_dev, scan_mask); |
Jonathan Cameron | 2a29a90 | 2011-05-18 14:41:28 +0100 | [diff] [blame] | 25 | |
Lars-Peter Clausen | 5eda355 | 2013-01-16 12:48:00 +0000 | [diff] [blame^] | 26 | kfree(adis->xfer); |
| 27 | kfree(adis->buffer); |
| 28 | |
| 29 | adis->xfer = kcalloc(2, sizeof(*adis->xfer), GFP_KERNEL); |
| 30 | if (!adis->xfer) |
Jonathan Cameron | 2a29a90 | 2011-05-18 14:41:28 +0100 | [diff] [blame] | 31 | return -ENOMEM; |
| 32 | |
Lars-Peter Clausen | 5eda355 | 2013-01-16 12:48:00 +0000 | [diff] [blame^] | 33 | adis->buffer = kzalloc(indio_dev->scan_bytes + sizeof(u16), |
| 34 | GFP_KERNEL); |
| 35 | if (!adis->buffer) |
| 36 | return -ENOMEM; |
Jonathan Cameron | 2a29a90 | 2011-05-18 14:41:28 +0100 | [diff] [blame] | 37 | |
Lars-Peter Clausen | 5eda355 | 2013-01-16 12:48:00 +0000 | [diff] [blame^] | 38 | rx = adis->buffer; |
| 39 | tx = adis->buffer + indio_dev->scan_bytes; |
Jonathan Cameron | 2a29a90 | 2011-05-18 14:41:28 +0100 | [diff] [blame] | 40 | |
Lars-Peter Clausen | 5eda355 | 2013-01-16 12:48:00 +0000 | [diff] [blame^] | 41 | tx[0] = ADIS_READ_REG(ADIS16400_GLOB_CMD); |
| 42 | tx[1] = 0; |
Jonathan Cameron | 2a29a90 | 2011-05-18 14:41:28 +0100 | [diff] [blame] | 43 | |
Lars-Peter Clausen | 5eda355 | 2013-01-16 12:48:00 +0000 | [diff] [blame^] | 44 | adis->xfer[0].tx_buf = tx; |
| 45 | adis->xfer[0].bits_per_word = 8; |
| 46 | adis->xfer[0].len = 2; |
| 47 | adis->xfer[1].tx_buf = tx; |
| 48 | adis->xfer[1].bits_per_word = 8; |
| 49 | adis->xfer[1].len = indio_dev->scan_bytes; |
| 50 | |
| 51 | spi_message_init(&adis->msg); |
| 52 | spi_message_add_tail(&adis->xfer[0], &adis->msg); |
| 53 | spi_message_add_tail(&adis->xfer[1], &adis->msg); |
| 54 | |
| 55 | return 0; |
Jonathan Cameron | 2a29a90 | 2011-05-18 14:41:28 +0100 | [diff] [blame] | 56 | } |
| 57 | |
Lars-Peter Clausen | 5eda355 | 2013-01-16 12:48:00 +0000 | [diff] [blame^] | 58 | irqreturn_t adis16400_trigger_handler(int irq, void *p) |
Barry Song | a9d26f0 | 2010-05-04 14:43:15 +0100 | [diff] [blame] | 59 | { |
Jonathan Cameron | e785484 | 2011-05-18 14:41:27 +0100 | [diff] [blame] | 60 | struct iio_poll_func *pf = p; |
Jonathan Cameron | e65bc6a | 2011-08-24 17:28:36 +0100 | [diff] [blame] | 61 | struct iio_dev *indio_dev = pf->indio_dev; |
Jonathan Cameron | 38d15f0 | 2011-05-18 14:42:23 +0100 | [diff] [blame] | 62 | struct adis16400_state *st = iio_priv(indio_dev); |
Lars-Peter Clausen | 5eda355 | 2013-01-16 12:48:00 +0000 | [diff] [blame^] | 63 | struct adis *adis = &st->adis; |
| 64 | u32 old_speed_hz = st->adis.spi->max_speed_hz; |
| 65 | int ret; |
Jonathan Cameron | 420fe2e | 2012-04-21 10:09:35 +0100 | [diff] [blame] | 66 | |
Lars-Peter Clausen | 5eda355 | 2013-01-16 12:48:00 +0000 | [diff] [blame^] | 67 | if (!adis->buffer) |
| 68 | return -ENOMEM; |
| 69 | |
| 70 | if (!(st->variant->flags & ADIS16400_NO_BURST) && |
| 71 | st->adis.spi->max_speed_hz > ADIS16400_SPI_BURST) { |
| 72 | st->adis.spi->max_speed_hz = ADIS16400_SPI_BURST; |
| 73 | spi_setup(st->adis.spi); |
Barry Song | a9d26f0 | 2010-05-04 14:43:15 +0100 | [diff] [blame] | 74 | } |
| 75 | |
Lars-Peter Clausen | 5eda355 | 2013-01-16 12:48:00 +0000 | [diff] [blame^] | 76 | ret = spi_sync(adis->spi, &adis->msg); |
| 77 | if (ret) |
| 78 | dev_err(&adis->spi->dev, "Failed to read data: %d\n", ret); |
| 79 | |
| 80 | if (!(st->variant->flags & ADIS16400_NO_BURST)) { |
| 81 | st->adis.spi->max_speed_hz = old_speed_hz; |
| 82 | spi_setup(st->adis.spi); |
Jonathan Cameron | 2a29a90 | 2011-05-18 14:41:28 +0100 | [diff] [blame] | 83 | } |
Lars-Peter Clausen | 5eda355 | 2013-01-16 12:48:00 +0000 | [diff] [blame^] | 84 | |
Barry Song | a9d26f0 | 2010-05-04 14:43:15 +0100 | [diff] [blame] | 85 | /* Guaranteed to be aligned with 8 byte boundary */ |
Lars-Peter Clausen | 5eda355 | 2013-01-16 12:48:00 +0000 | [diff] [blame^] | 86 | if (indio_dev->scan_timestamp) { |
| 87 | void *b = adis->buffer + indio_dev->scan_bytes - sizeof(s64); |
| 88 | *(s64 *)b = pf->timestamp; |
| 89 | } |
Barry Song | a9d26f0 | 2010-05-04 14:43:15 +0100 | [diff] [blame] | 90 | |
Lars-Peter Clausen | 5eda355 | 2013-01-16 12:48:00 +0000 | [diff] [blame^] | 91 | iio_push_to_buffers(indio_dev, adis->buffer); |
| 92 | |
Jonathan Cameron | e785484 | 2011-05-18 14:41:27 +0100 | [diff] [blame] | 93 | iio_trigger_notify_done(indio_dev->trig); |
Barry Song | a9d26f0 | 2010-05-04 14:43:15 +0100 | [diff] [blame] | 94 | |
Jonathan Cameron | e785484 | 2011-05-18 14:41:27 +0100 | [diff] [blame] | 95 | return IRQ_HANDLED; |
Barry Song | a9d26f0 | 2010-05-04 14:43:15 +0100 | [diff] [blame] | 96 | } |