| /* |
| * Copyright (C) 2010-2012 Michael Hennerich, Analog Devices Inc. |
| * Copyright (C) 2008-2010 Jonathan Cameron |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| * ad799x_ring.c |
| */ |
| |
| #include <linux/interrupt.h> |
| #include <linux/slab.h> |
| #include <linux/kernel.h> |
| #include <linux/list.h> |
| #include <linux/i2c.h> |
| #include <linux/bitops.h> |
| |
| #include <linux/iio/iio.h> |
| #include <linux/iio/buffer.h> |
| #include <linux/iio/trigger_consumer.h> |
| #include <linux/iio/triggered_buffer.h> |
| |
| #include "ad799x.h" |
| |
| /** |
| * ad799x_trigger_handler() bh of trigger launched polling to ring buffer |
| * |
| * Currently there is no option in this driver to disable the saving of |
| * timestamps within the ring. |
| **/ |
| |
| static irqreturn_t ad799x_trigger_handler(int irq, void *p) |
| { |
| struct iio_poll_func *pf = p; |
| struct iio_dev *indio_dev = pf->indio_dev; |
| struct ad799x_state *st = iio_priv(indio_dev); |
| int b_sent; |
| u8 cmd; |
| |
| switch (st->id) { |
| case ad7991: |
| case ad7995: |
| case ad7999: |
| cmd = st->config | |
| (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT); |
| break; |
| case ad7992: |
| case ad7993: |
| case ad7994: |
| cmd = (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT) | |
| AD7998_CONV_RES_REG; |
| break; |
| case ad7997: |
| case ad7998: |
| cmd = AD7997_8_READ_SEQUENCE | AD7998_CONV_RES_REG; |
| break; |
| default: |
| cmd = 0; |
| } |
| |
| b_sent = i2c_smbus_read_i2c_block_data(st->client, |
| cmd, st->transfer_size, st->rx_buf); |
| if (b_sent < 0) |
| goto out; |
| |
| iio_push_to_buffers_with_timestamp(indio_dev, st->rx_buf, |
| iio_get_time_ns()); |
| out: |
| iio_trigger_notify_done(indio_dev->trig); |
| |
| return IRQ_HANDLED; |
| } |
| |
| int ad799x_register_ring_funcs_and_init(struct iio_dev *indio_dev) |
| { |
| return iio_triggered_buffer_setup(indio_dev, NULL, |
| &ad799x_trigger_handler, NULL); |
| } |
| |
| void ad799x_ring_cleanup(struct iio_dev *indio_dev) |
| { |
| iio_triggered_buffer_cleanup(indio_dev); |
| } |