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);
38 struct iio_buffer *ring = indio_dev->buffer;
44 rxbuf = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
53 (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT);
58 cmd = (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT) |
63 cmd = AD7997_8_READ_SEQUENCE | AD7998_CONV_RES_REG;
69 b_sent = i2c_smbus_read_i2c_block_data(st->client,
70 cmd, bitmap_weight(indio_dev->active_scan_mask,
71 indio_dev->masklength) * 2, rxbuf);
75 time_ns = iio_get_time_ns();
77 if (indio_dev->scan_timestamp)
78 memcpy(rxbuf + indio_dev->scan_bytes - sizeof(s64),
79 &time_ns, sizeof(time_ns));
81 ring->access->store_to(indio_dev->buffer, rxbuf, time_ns);
85 iio_trigger_notify_done(indio_dev->trig);
90 int ad799x_register_ring_funcs_and_init(struct iio_dev *indio_dev)
92 return iio_triggered_buffer_setup(indio_dev, NULL,
93 &ad799x_trigger_handler, NULL);
96 void ad799x_ring_cleanup(struct iio_dev *indio_dev)
98 iio_triggered_buffer_cleanup(indio_dev);