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155 lines
3.5 KiB
155 lines
3.5 KiB
// 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 <[email protected]> |
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* Copyright (c) 2011 Manuel Stahl <[email protected]> |
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* Copyright (c) 2012 Thorsten Nowak <[email protected]> |
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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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