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15ea2878bf
Continuing from Alexandru Ardelean's introduction of the split between driver modifiable fields and those that should only be set by the core. This could have been done in two steps to make the actual move after introducing iio_device_id() but there seemed limited point to that given how mechanical the majority of the patch is. Includes fixup from Alex for missing mxs-lradc-adc conversion. Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Reviewed-by: Alexandru Ardelean <ardeleanalex@gmail.com> Link: https://lore.kernel.org/r/20210426174911.397061-2-jic23@kernel.org
155 lines
3.5 KiB
C
155 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* itg3200_buffer.c -- support InvenSense ITG3200
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* Digital 3-Axis Gyroscope driver
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*
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* Copyright (c) 2011 Christian Strobel <christian.strobel@iis.fraunhofer.de>
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* Copyright (c) 2011 Manuel Stahl <manuel.stahl@iis.fraunhofer.de>
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* Copyright (c) 2012 Thorsten Nowak <thorsten.nowak@iis.fraunhofer.de>
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*/
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/buffer.h>
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#include <linux/iio/trigger.h>
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#include <linux/iio/trigger_consumer.h>
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#include <linux/iio/triggered_buffer.h>
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#include <linux/iio/gyro/itg3200.h>
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static int itg3200_read_all_channels(struct i2c_client *i2c, __be16 *buf)
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{
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u8 tx = 0x80 | ITG3200_REG_TEMP_OUT_H;
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struct i2c_msg msg[2] = {
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{
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.addr = i2c->addr,
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.flags = i2c->flags,
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.len = 1,
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.buf = &tx,
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},
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{
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.addr = i2c->addr,
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.flags = i2c->flags | I2C_M_RD,
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.len = ITG3200_SCAN_ELEMENTS * sizeof(s16),
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.buf = (char *)&buf,
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},
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};
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return i2c_transfer(i2c->adapter, msg, 2);
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}
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static irqreturn_t itg3200_trigger_handler(int irq, void *p)
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{
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struct iio_poll_func *pf = p;
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struct iio_dev *indio_dev = pf->indio_dev;
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struct itg3200 *st = iio_priv(indio_dev);
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/*
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* Ensure correct alignment and padding including for the
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* timestamp that may be inserted.
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*/
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struct {
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__be16 buf[ITG3200_SCAN_ELEMENTS];
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s64 ts __aligned(8);
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} scan;
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int ret = itg3200_read_all_channels(st->i2c, scan.buf);
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if (ret < 0)
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goto error_ret;
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iio_push_to_buffers_with_timestamp(indio_dev, &scan, pf->timestamp);
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iio_trigger_notify_done(indio_dev->trig);
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error_ret:
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return IRQ_HANDLED;
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}
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int itg3200_buffer_configure(struct iio_dev *indio_dev)
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{
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return iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
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itg3200_trigger_handler, NULL);
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}
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void itg3200_buffer_unconfigure(struct iio_dev *indio_dev)
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{
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iio_triggered_buffer_cleanup(indio_dev);
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}
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static int itg3200_data_rdy_trigger_set_state(struct iio_trigger *trig,
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bool state)
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{
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struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
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int ret;
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u8 msc;
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ret = itg3200_read_reg_8(indio_dev, ITG3200_REG_IRQ_CONFIG, &msc);
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if (ret)
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goto error_ret;
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if (state)
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msc |= ITG3200_IRQ_DATA_RDY_ENABLE;
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else
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msc &= ~ITG3200_IRQ_DATA_RDY_ENABLE;
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ret = itg3200_write_reg_8(indio_dev, ITG3200_REG_IRQ_CONFIG, msc);
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if (ret)
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goto error_ret;
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error_ret:
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return ret;
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}
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static const struct iio_trigger_ops itg3200_trigger_ops = {
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.set_trigger_state = &itg3200_data_rdy_trigger_set_state,
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};
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int itg3200_probe_trigger(struct iio_dev *indio_dev)
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{
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int ret;
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struct itg3200 *st = iio_priv(indio_dev);
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st->trig = iio_trigger_alloc(&st->i2c->dev, "%s-dev%d", indio_dev->name,
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iio_device_id(indio_dev));
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if (!st->trig)
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return -ENOMEM;
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ret = request_irq(st->i2c->irq,
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&iio_trigger_generic_data_rdy_poll,
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IRQF_TRIGGER_RISING,
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"itg3200_data_rdy",
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st->trig);
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if (ret)
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goto error_free_trig;
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st->trig->ops = &itg3200_trigger_ops;
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iio_trigger_set_drvdata(st->trig, indio_dev);
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ret = iio_trigger_register(st->trig);
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if (ret)
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goto error_free_irq;
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/* select default trigger */
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indio_dev->trig = iio_trigger_get(st->trig);
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return 0;
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error_free_irq:
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free_irq(st->i2c->irq, st->trig);
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error_free_trig:
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iio_trigger_free(st->trig);
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return ret;
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}
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void itg3200_remove_trigger(struct iio_dev *indio_dev)
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{
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struct itg3200 *st = iio_priv(indio_dev);
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iio_trigger_unregister(st->trig);
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free_irq(st->i2c->irq, st->trig);
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iio_trigger_free(st->trig);
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}
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