1 // SPDX-License-Identifier: GPL-2.0-only
3 * itg3200_buffer.c -- support InvenSense ITG3200
4 * Digital 3-Axis Gyroscope driver
6 * Copyright (c) 2011 Christian Strobel <christian.strobel@iis.fraunhofer.de>
7 * Copyright (c) 2011 Manuel Stahl <manuel.stahl@iis.fraunhofer.de>
8 * Copyright (c) 2012 Thorsten Nowak <thorsten.nowak@iis.fraunhofer.de>
11 #include <linux/slab.h>
12 #include <linux/i2c.h>
13 #include <linux/interrupt.h>
15 #include <linux/iio/iio.h>
16 #include <linux/iio/buffer.h>
17 #include <linux/iio/trigger.h>
18 #include <linux/iio/trigger_consumer.h>
19 #include <linux/iio/triggered_buffer.h>
20 #include <linux/iio/gyro/itg3200.h>
23 static int itg3200_read_all_channels(struct i2c_client *i2c, __be16 *buf)
25 u8 tx = 0x80 | ITG3200_REG_TEMP_OUT_H;
26 struct i2c_msg msg[2] = {
35 .flags = i2c->flags | I2C_M_RD,
36 .len = ITG3200_SCAN_ELEMENTS * sizeof(s16),
41 return i2c_transfer(i2c->adapter, msg, 2);
44 static irqreturn_t itg3200_trigger_handler(int irq, void *p)
46 struct iio_poll_func *pf = p;
47 struct iio_dev *indio_dev = pf->indio_dev;
48 struct itg3200 *st = iio_priv(indio_dev);
49 __be16 buf[ITG3200_SCAN_ELEMENTS + sizeof(s64)/sizeof(u16)];
51 int ret = itg3200_read_all_channels(st->i2c, buf);
55 iio_push_to_buffers_with_timestamp(indio_dev, buf, pf->timestamp);
57 iio_trigger_notify_done(indio_dev->trig);
63 int itg3200_buffer_configure(struct iio_dev *indio_dev)
65 return iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
66 itg3200_trigger_handler, NULL);
69 void itg3200_buffer_unconfigure(struct iio_dev *indio_dev)
71 iio_triggered_buffer_cleanup(indio_dev);
75 static int itg3200_data_rdy_trigger_set_state(struct iio_trigger *trig,
78 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
82 ret = itg3200_read_reg_8(indio_dev, ITG3200_REG_IRQ_CONFIG, &msc);
87 msc |= ITG3200_IRQ_DATA_RDY_ENABLE;
89 msc &= ~ITG3200_IRQ_DATA_RDY_ENABLE;
91 ret = itg3200_write_reg_8(indio_dev, ITG3200_REG_IRQ_CONFIG, msc);
100 static const struct iio_trigger_ops itg3200_trigger_ops = {
101 .set_trigger_state = &itg3200_data_rdy_trigger_set_state,
104 int itg3200_probe_trigger(struct iio_dev *indio_dev)
107 struct itg3200 *st = iio_priv(indio_dev);
109 st->trig = iio_trigger_alloc("%s-dev%d", indio_dev->name,
114 ret = request_irq(st->i2c->irq,
115 &iio_trigger_generic_data_rdy_poll,
120 goto error_free_trig;
123 st->trig->dev.parent = &st->i2c->dev;
124 st->trig->ops = &itg3200_trigger_ops;
125 iio_trigger_set_drvdata(st->trig, indio_dev);
126 ret = iio_trigger_register(st->trig);
130 /* select default trigger */
131 indio_dev->trig = iio_trigger_get(st->trig);
136 free_irq(st->i2c->irq, st->trig);
138 iio_trigger_free(st->trig);
142 void itg3200_remove_trigger(struct iio_dev *indio_dev)
144 struct itg3200 *st = iio_priv(indio_dev);
146 iio_trigger_unregister(st->trig);
147 free_irq(st->i2c->irq, st->trig);
148 iio_trigger_free(st->trig);