1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Common library for ADIS16XXX devices
5 * Copyright 2012 Analog Devices Inc.
6 * Author: Lars-Peter Clausen <lars@metafoo.de>
9 #include <linux/export.h>
10 #include <linux/interrupt.h>
11 #include <linux/mutex.h>
12 #include <linux/kernel.h>
13 #include <linux/spi/spi.h>
14 #include <linux/slab.h>
16 #include <linux/iio/iio.h>
17 #include <linux/iio/buffer.h>
18 #include <linux/iio/trigger_consumer.h>
19 #include <linux/iio/triggered_buffer.h>
20 #include <linux/iio/imu/adis.h>
22 static int adis_update_scan_mode_burst(struct iio_dev *indio_dev,
23 const unsigned long *scan_mask)
25 struct adis *adis = iio_device_get_drvdata(indio_dev);
26 unsigned int burst_length;
29 /* All but the timestamp channel */
30 burst_length = (indio_dev->num_channels - 1) * sizeof(u16);
31 burst_length += adis->burst->extra_len;
33 adis->xfer = kcalloc(2, sizeof(*adis->xfer), GFP_KERNEL);
37 adis->buffer = kzalloc(burst_length + sizeof(u16), GFP_KERNEL);
41 tx = adis->buffer + burst_length;
42 tx[0] = ADIS_READ_REG(adis->burst->reg_cmd);
45 adis->xfer[0].tx_buf = tx;
46 adis->xfer[0].bits_per_word = 8;
47 adis->xfer[0].len = 2;
48 adis->xfer[1].rx_buf = adis->buffer;
49 adis->xfer[1].bits_per_word = 8;
50 adis->xfer[1].len = burst_length;
52 spi_message_init(&adis->msg);
53 spi_message_add_tail(&adis->xfer[0], &adis->msg);
54 spi_message_add_tail(&adis->xfer[1], &adis->msg);
59 int adis_update_scan_mode(struct iio_dev *indio_dev,
60 const unsigned long *scan_mask)
62 struct adis *adis = iio_device_get_drvdata(indio_dev);
63 const struct iio_chan_spec *chan;
64 unsigned int scan_count;
71 if (adis->burst && adis->burst->en)
72 return adis_update_scan_mode_burst(indio_dev, scan_mask);
74 scan_count = indio_dev->scan_bytes / 2;
76 adis->xfer = kcalloc(scan_count + 1, sizeof(*adis->xfer), GFP_KERNEL);
80 adis->buffer = kcalloc(indio_dev->scan_bytes, 2, GFP_KERNEL);
87 spi_message_init(&adis->msg);
89 for (j = 0; j <= scan_count; j++) {
90 adis->xfer[j].bits_per_word = 8;
92 adis->xfer[j].cs_change = 1;
93 adis->xfer[j].len = 2;
94 adis->xfer[j].delay_usecs = adis->data->read_delay;
96 adis->xfer[j].tx_buf = &tx[j];
98 adis->xfer[j].rx_buf = &rx[j - 1];
99 spi_message_add_tail(&adis->xfer[j], &adis->msg);
102 chan = indio_dev->channels;
103 for (i = 0; i < indio_dev->num_channels; i++, chan++) {
104 if (!test_bit(chan->scan_index, scan_mask))
106 if (chan->scan_type.storagebits == 32)
107 *tx++ = cpu_to_be16((chan->address + 2) << 8);
108 *tx++ = cpu_to_be16(chan->address << 8);
113 EXPORT_SYMBOL_GPL(adis_update_scan_mode);
115 static irqreturn_t adis_trigger_handler(int irq, void *p)
117 struct iio_poll_func *pf = p;
118 struct iio_dev *indio_dev = pf->indio_dev;
119 struct adis *adis = iio_device_get_drvdata(indio_dev);
125 if (adis->data->has_paging) {
126 mutex_lock(&adis->txrx_lock);
127 if (adis->current_page != 0) {
128 adis->tx[0] = ADIS_WRITE_REG(ADIS_REG_PAGE_ID);
130 spi_write(adis->spi, adis->tx, 2);
134 ret = spi_sync(adis->spi, &adis->msg);
136 dev_err(&adis->spi->dev, "Failed to read data: %d", ret);
139 if (adis->data->has_paging) {
140 adis->current_page = 0;
141 mutex_unlock(&adis->txrx_lock);
144 iio_push_to_buffers_with_timestamp(indio_dev, adis->buffer,
147 iio_trigger_notify_done(indio_dev->trig);
153 * adis_setup_buffer_and_trigger() - Sets up buffer and trigger for the adis device
154 * @adis: The adis device.
155 * @indio_dev: The IIO device.
156 * @trigger_handler: Optional trigger handler, may be NULL.
158 * Returns 0 on success, a negative error code otherwise.
160 * This function sets up the buffer and trigger for a adis devices. If
161 * 'trigger_handler' is NULL the default trigger handler will be used. The
162 * default trigger handler will simply read the registers assigned to the
163 * currently active channels.
165 * adis_cleanup_buffer_and_trigger() should be called to free the resources
166 * allocated by this function.
168 int adis_setup_buffer_and_trigger(struct adis *adis, struct iio_dev *indio_dev,
169 irqreturn_t (*trigger_handler)(int, void *))
173 if (!trigger_handler)
174 trigger_handler = adis_trigger_handler;
176 ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
177 trigger_handler, NULL);
181 if (adis->spi->irq) {
182 ret = adis_probe_trigger(adis, indio_dev);
184 goto error_buffer_cleanup;
188 error_buffer_cleanup:
189 iio_triggered_buffer_cleanup(indio_dev);
192 EXPORT_SYMBOL_GPL(adis_setup_buffer_and_trigger);
195 * adis_cleanup_buffer_and_trigger() - Free buffer and trigger resources
196 * @adis: The adis device.
197 * @indio_dev: The IIO device.
199 * Frees resources allocated by adis_setup_buffer_and_trigger()
201 void adis_cleanup_buffer_and_trigger(struct adis *adis,
202 struct iio_dev *indio_dev)
205 adis_remove_trigger(adis);
208 iio_triggered_buffer_cleanup(indio_dev);
210 EXPORT_SYMBOL_GPL(adis_cleanup_buffer_and_trigger);