2 * Copyright (C) 2010-2012 Michael Hennerich, Analog Devices Inc.
3 * Copyright (C) 2008-2010 Jonathan Cameron
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
12 #include <linux/interrupt.h>
13 #include <linux/slab.h>
14 #include <linux/kernel.h>
15 #include <linux/list.h>
16 #include <linux/i2c.h>
17 #include <linux/bitops.h>
19 #include <linux/iio/iio.h>
20 #include <linux/iio/buffer.h>
21 #include <linux/iio/trigger_consumer.h>
22 #include <linux/iio/triggered_buffer.h>
27 * ad799x_trigger_handler() bh of trigger launched polling to ring buffer
29 * Currently there is no option in this driver to disable the saving of
30 * timestamps within the ring.
33 static irqreturn_t ad799x_trigger_handler(int irq, void *p)
35 struct iio_poll_func *pf = p;
36 struct iio_dev *indio_dev = pf->indio_dev;
37 struct ad799x_state *st = iio_priv(indio_dev);
47 (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT);
52 cmd = (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT) |
57 cmd = AD7997_8_READ_SEQUENCE | AD7998_CONV_RES_REG;
63 b_sent = i2c_smbus_read_i2c_block_data(st->client,
64 cmd, st->transfer_size, st->rx_buf);
68 time_ns = iio_get_time_ns();
70 if (indio_dev->scan_timestamp)
71 memcpy(st->rx_buf + indio_dev->scan_bytes - sizeof(s64),
72 &time_ns, sizeof(time_ns));
74 iio_push_to_buffers(indio_dev, st->rx_buf);
76 iio_trigger_notify_done(indio_dev->trig);
81 int ad799x_register_ring_funcs_and_init(struct iio_dev *indio_dev)
83 return iio_triggered_buffer_setup(indio_dev, NULL,
84 &ad799x_trigger_handler, NULL);
87 void ad799x_ring_cleanup(struct iio_dev *indio_dev)
89 iio_triggered_buffer_cleanup(indio_dev);