1fda8d26eSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
2af300848SLars-Peter Clausen /*
3af300848SLars-Peter Clausen * Support code for Analog Devices Sigma-Delta ADCs
4af300848SLars-Peter Clausen *
5af300848SLars-Peter Clausen * Copyright 2012 Analog Devices Inc.
6af300848SLars-Peter Clausen * Author: Lars-Peter Clausen <lars@metafoo.de>
7af300848SLars-Peter Clausen */
8af300848SLars-Peter Clausen
98bea9af8SLars-Peter Clausen #include <linux/align.h>
10af300848SLars-Peter Clausen #include <linux/interrupt.h>
11af300848SLars-Peter Clausen #include <linux/device.h>
12af300848SLars-Peter Clausen #include <linux/kernel.h>
13af300848SLars-Peter Clausen #include <linux/slab.h>
14af300848SLars-Peter Clausen #include <linux/spi/spi.h>
15af300848SLars-Peter Clausen #include <linux/err.h>
16af300848SLars-Peter Clausen #include <linux/module.h>
17af300848SLars-Peter Clausen
18af300848SLars-Peter Clausen #include <linux/iio/iio.h>
19af300848SLars-Peter Clausen #include <linux/iio/sysfs.h>
20af300848SLars-Peter Clausen #include <linux/iio/buffer.h>
21af300848SLars-Peter Clausen #include <linux/iio/trigger.h>
22af300848SLars-Peter Clausen #include <linux/iio/trigger_consumer.h>
23af300848SLars-Peter Clausen #include <linux/iio/triggered_buffer.h>
24af300848SLars-Peter Clausen #include <linux/iio/adc/ad_sigma_delta.h>
25af300848SLars-Peter Clausen
26af300848SLars-Peter Clausen #include <asm/unaligned.h>
27af300848SLars-Peter Clausen
28af300848SLars-Peter Clausen
29af300848SLars-Peter Clausen #define AD_SD_COMM_CHAN_MASK 0x3
30af300848SLars-Peter Clausen
31af300848SLars-Peter Clausen #define AD_SD_REG_COMM 0x00
32af300848SLars-Peter Clausen #define AD_SD_REG_DATA 0x03
33af300848SLars-Peter Clausen
34af300848SLars-Peter Clausen /**
35af300848SLars-Peter Clausen * ad_sd_set_comm() - Set communications register
36af300848SLars-Peter Clausen *
37af300848SLars-Peter Clausen * @sigma_delta: The sigma delta device
38af300848SLars-Peter Clausen * @comm: New value for the communications register
39af300848SLars-Peter Clausen */
ad_sd_set_comm(struct ad_sigma_delta * sigma_delta,uint8_t comm)40af300848SLars-Peter Clausen void ad_sd_set_comm(struct ad_sigma_delta *sigma_delta, uint8_t comm)
41af300848SLars-Peter Clausen {
42af300848SLars-Peter Clausen /* Some variants use the lower two bits of the communications register
43af300848SLars-Peter Clausen * to select the channel */
44af300848SLars-Peter Clausen sigma_delta->comm = comm & AD_SD_COMM_CHAN_MASK;
45af300848SLars-Peter Clausen }
46ef807729SJonathan Cameron EXPORT_SYMBOL_NS_GPL(ad_sd_set_comm, IIO_AD_SIGMA_DELTA);
47af300848SLars-Peter Clausen
48af300848SLars-Peter Clausen /**
49af300848SLars-Peter Clausen * ad_sd_write_reg() - Write a register
50af300848SLars-Peter Clausen *
51af300848SLars-Peter Clausen * @sigma_delta: The sigma delta device
52af300848SLars-Peter Clausen * @reg: Address of the register
53af300848SLars-Peter Clausen * @size: Size of the register (0-3)
54af300848SLars-Peter Clausen * @val: Value to write to the register
55af300848SLars-Peter Clausen *
56af300848SLars-Peter Clausen * Returns 0 on success, an error code otherwise.
57af300848SLars-Peter Clausen **/
ad_sd_write_reg(struct ad_sigma_delta * sigma_delta,unsigned int reg,unsigned int size,unsigned int val)58af300848SLars-Peter Clausen int ad_sd_write_reg(struct ad_sigma_delta *sigma_delta, unsigned int reg,
59af300848SLars-Peter Clausen unsigned int size, unsigned int val)
60af300848SLars-Peter Clausen {
610fb6ee8dSLars-Peter Clausen uint8_t *data = sigma_delta->tx_buf;
62af300848SLars-Peter Clausen struct spi_transfer t = {
63af300848SLars-Peter Clausen .tx_buf = data,
64af300848SLars-Peter Clausen .len = size + 1,
65df1d80aeSLars-Peter Clausen .cs_change = sigma_delta->keep_cs_asserted,
66af300848SLars-Peter Clausen };
67af300848SLars-Peter Clausen struct spi_message m;
68af300848SLars-Peter Clausen int ret;
69af300848SLars-Peter Clausen
70af300848SLars-Peter Clausen data[0] = (reg << sigma_delta->info->addr_shift) | sigma_delta->comm;
71af300848SLars-Peter Clausen
72af300848SLars-Peter Clausen switch (size) {
73af300848SLars-Peter Clausen case 3:
74c1909ab0SAndy Shevchenko put_unaligned_be24(val, &data[1]);
75af300848SLars-Peter Clausen break;
76af300848SLars-Peter Clausen case 2:
77af300848SLars-Peter Clausen put_unaligned_be16(val, &data[1]);
78af300848SLars-Peter Clausen break;
79af300848SLars-Peter Clausen case 1:
80af300848SLars-Peter Clausen data[1] = val;
81af300848SLars-Peter Clausen break;
82af300848SLars-Peter Clausen case 0:
83af300848SLars-Peter Clausen break;
84af300848SLars-Peter Clausen default:
85af300848SLars-Peter Clausen return -EINVAL;
86af300848SLars-Peter Clausen }
87af300848SLars-Peter Clausen
88af300848SLars-Peter Clausen spi_message_init(&m);
89af300848SLars-Peter Clausen spi_message_add_tail(&t, &m);
90af300848SLars-Peter Clausen
91af300848SLars-Peter Clausen if (sigma_delta->bus_locked)
92af300848SLars-Peter Clausen ret = spi_sync_locked(sigma_delta->spi, &m);
93af300848SLars-Peter Clausen else
94af300848SLars-Peter Clausen ret = spi_sync(sigma_delta->spi, &m);
95af300848SLars-Peter Clausen
96af300848SLars-Peter Clausen return ret;
97af300848SLars-Peter Clausen }
98ef807729SJonathan Cameron EXPORT_SYMBOL_NS_GPL(ad_sd_write_reg, IIO_AD_SIGMA_DELTA);
99af300848SLars-Peter Clausen
ad_sd_read_reg_raw(struct ad_sigma_delta * sigma_delta,unsigned int reg,unsigned int size,uint8_t * val)100af300848SLars-Peter Clausen static int ad_sd_read_reg_raw(struct ad_sigma_delta *sigma_delta,
101af300848SLars-Peter Clausen unsigned int reg, unsigned int size, uint8_t *val)
102af300848SLars-Peter Clausen {
1030fb6ee8dSLars-Peter Clausen uint8_t *data = sigma_delta->tx_buf;
104af300848SLars-Peter Clausen int ret;
105af300848SLars-Peter Clausen struct spi_transfer t[] = {
106af300848SLars-Peter Clausen {
107af300848SLars-Peter Clausen .tx_buf = data,
108af300848SLars-Peter Clausen .len = 1,
109af300848SLars-Peter Clausen }, {
110af300848SLars-Peter Clausen .rx_buf = val,
111af300848SLars-Peter Clausen .len = size,
112af300848SLars-Peter Clausen .cs_change = sigma_delta->bus_locked,
113af300848SLars-Peter Clausen },
114af300848SLars-Peter Clausen };
115af300848SLars-Peter Clausen struct spi_message m;
116af300848SLars-Peter Clausen
117af300848SLars-Peter Clausen spi_message_init(&m);
118af300848SLars-Peter Clausen
119af300848SLars-Peter Clausen if (sigma_delta->info->has_registers) {
120af300848SLars-Peter Clausen data[0] = reg << sigma_delta->info->addr_shift;
121af300848SLars-Peter Clausen data[0] |= sigma_delta->info->read_mask;
122fccfb9ceSDragos Bogdan data[0] |= sigma_delta->comm;
123af300848SLars-Peter Clausen spi_message_add_tail(&t[0], &m);
124af300848SLars-Peter Clausen }
125af300848SLars-Peter Clausen spi_message_add_tail(&t[1], &m);
126af300848SLars-Peter Clausen
127af300848SLars-Peter Clausen if (sigma_delta->bus_locked)
128af300848SLars-Peter Clausen ret = spi_sync_locked(sigma_delta->spi, &m);
129af300848SLars-Peter Clausen else
130af300848SLars-Peter Clausen ret = spi_sync(sigma_delta->spi, &m);
131af300848SLars-Peter Clausen
132af300848SLars-Peter Clausen return ret;
133af300848SLars-Peter Clausen }
134af300848SLars-Peter Clausen
135af300848SLars-Peter Clausen /**
136af300848SLars-Peter Clausen * ad_sd_read_reg() - Read a register
137af300848SLars-Peter Clausen *
138af300848SLars-Peter Clausen * @sigma_delta: The sigma delta device
139af300848SLars-Peter Clausen * @reg: Address of the register
140af300848SLars-Peter Clausen * @size: Size of the register (1-4)
141af300848SLars-Peter Clausen * @val: Read value
142af300848SLars-Peter Clausen *
143af300848SLars-Peter Clausen * Returns 0 on success, an error code otherwise.
144af300848SLars-Peter Clausen **/
ad_sd_read_reg(struct ad_sigma_delta * sigma_delta,unsigned int reg,unsigned int size,unsigned int * val)145af300848SLars-Peter Clausen int ad_sd_read_reg(struct ad_sigma_delta *sigma_delta,
146af300848SLars-Peter Clausen unsigned int reg, unsigned int size, unsigned int *val)
147af300848SLars-Peter Clausen {
148af300848SLars-Peter Clausen int ret;
149af300848SLars-Peter Clausen
1500fb6ee8dSLars-Peter Clausen ret = ad_sd_read_reg_raw(sigma_delta, reg, size, sigma_delta->rx_buf);
151af300848SLars-Peter Clausen if (ret < 0)
152af300848SLars-Peter Clausen goto out;
153af300848SLars-Peter Clausen
154af300848SLars-Peter Clausen switch (size) {
155af300848SLars-Peter Clausen case 4:
1560fb6ee8dSLars-Peter Clausen *val = get_unaligned_be32(sigma_delta->rx_buf);
157af300848SLars-Peter Clausen break;
158af300848SLars-Peter Clausen case 3:
1590fb6ee8dSLars-Peter Clausen *val = get_unaligned_be24(sigma_delta->rx_buf);
160af300848SLars-Peter Clausen break;
161af300848SLars-Peter Clausen case 2:
1620fb6ee8dSLars-Peter Clausen *val = get_unaligned_be16(sigma_delta->rx_buf);
163af300848SLars-Peter Clausen break;
164af300848SLars-Peter Clausen case 1:
1650fb6ee8dSLars-Peter Clausen *val = sigma_delta->rx_buf[0];
166af300848SLars-Peter Clausen break;
167af300848SLars-Peter Clausen default:
168af300848SLars-Peter Clausen ret = -EINVAL;
169af300848SLars-Peter Clausen break;
170af300848SLars-Peter Clausen }
171af300848SLars-Peter Clausen
172af300848SLars-Peter Clausen out:
173af300848SLars-Peter Clausen return ret;
174af300848SLars-Peter Clausen }
175ef807729SJonathan Cameron EXPORT_SYMBOL_NS_GPL(ad_sd_read_reg, IIO_AD_SIGMA_DELTA);
176af300848SLars-Peter Clausen
1777fc10de8SDragos Bogdan /**
1787fc10de8SDragos Bogdan * ad_sd_reset() - Reset the serial interface
1797fc10de8SDragos Bogdan *
1807fc10de8SDragos Bogdan * @sigma_delta: The sigma delta device
1817fc10de8SDragos Bogdan * @reset_length: Number of SCLKs with DIN = 1
1827fc10de8SDragos Bogdan *
1837fc10de8SDragos Bogdan * Returns 0 on success, an error code otherwise.
1847fc10de8SDragos Bogdan **/
ad_sd_reset(struct ad_sigma_delta * sigma_delta,unsigned int reset_length)1857fc10de8SDragos Bogdan int ad_sd_reset(struct ad_sigma_delta *sigma_delta,
1867fc10de8SDragos Bogdan unsigned int reset_length)
1877fc10de8SDragos Bogdan {
1887fc10de8SDragos Bogdan uint8_t *buf;
1897fc10de8SDragos Bogdan unsigned int size;
1907fc10de8SDragos Bogdan int ret;
1917fc10de8SDragos Bogdan
1927fc10de8SDragos Bogdan size = DIV_ROUND_UP(reset_length, 8);
1937fc10de8SDragos Bogdan buf = kcalloc(size, sizeof(*buf), GFP_KERNEL);
1947fc10de8SDragos Bogdan if (!buf)
1957fc10de8SDragos Bogdan return -ENOMEM;
1967fc10de8SDragos Bogdan
1977fc10de8SDragos Bogdan memset(buf, 0xff, size);
1987fc10de8SDragos Bogdan ret = spi_write(sigma_delta->spi, buf, size);
1997fc10de8SDragos Bogdan kfree(buf);
2007fc10de8SDragos Bogdan
2017fc10de8SDragos Bogdan return ret;
2027fc10de8SDragos Bogdan }
203ef807729SJonathan Cameron EXPORT_SYMBOL_NS_GPL(ad_sd_reset, IIO_AD_SIGMA_DELTA);
2047fc10de8SDragos Bogdan
ad_sd_calibrate(struct ad_sigma_delta * sigma_delta,unsigned int mode,unsigned int channel)205c88c8cd8SMircea Caprioru int ad_sd_calibrate(struct ad_sigma_delta *sigma_delta,
206af300848SLars-Peter Clausen unsigned int mode, unsigned int channel)
207af300848SLars-Peter Clausen {
208af300848SLars-Peter Clausen int ret;
2094d68b25cSWolfram Sang unsigned long time_left;
210af300848SLars-Peter Clausen
211af300848SLars-Peter Clausen ret = ad_sigma_delta_set_channel(sigma_delta, channel);
212af300848SLars-Peter Clausen if (ret)
213af300848SLars-Peter Clausen return ret;
214af300848SLars-Peter Clausen
2152780e7b7SUwe Kleine-König spi_bus_lock(sigma_delta->spi->controller);
216af300848SLars-Peter Clausen sigma_delta->bus_locked = true;
217df1d80aeSLars-Peter Clausen sigma_delta->keep_cs_asserted = true;
21816735d02SWolfram Sang reinit_completion(&sigma_delta->completion);
219af300848SLars-Peter Clausen
220af300848SLars-Peter Clausen ret = ad_sigma_delta_set_mode(sigma_delta, mode);
221af300848SLars-Peter Clausen if (ret < 0)
222af300848SLars-Peter Clausen goto out;
223af300848SLars-Peter Clausen
224af300848SLars-Peter Clausen sigma_delta->irq_dis = false;
2257b0c9f8fSDumitru Ceclan enable_irq(sigma_delta->irq_line);
2264d68b25cSWolfram Sang time_left = wait_for_completion_timeout(&sigma_delta->completion, 2 * HZ);
2274d68b25cSWolfram Sang if (time_left == 0) {
228af300848SLars-Peter Clausen sigma_delta->irq_dis = true;
2297b0c9f8fSDumitru Ceclan disable_irq_nosync(sigma_delta->irq_line);
230af300848SLars-Peter Clausen ret = -EIO;
231af300848SLars-Peter Clausen } else {
232af300848SLars-Peter Clausen ret = 0;
233af300848SLars-Peter Clausen }
234af300848SLars-Peter Clausen out:
235df1d80aeSLars-Peter Clausen sigma_delta->keep_cs_asserted = false;
236df1d80aeSLars-Peter Clausen ad_sigma_delta_set_mode(sigma_delta, AD_SD_MODE_IDLE);
237af300848SLars-Peter Clausen sigma_delta->bus_locked = false;
2382780e7b7SUwe Kleine-König spi_bus_unlock(sigma_delta->spi->controller);
239af300848SLars-Peter Clausen
240af300848SLars-Peter Clausen return ret;
241af300848SLars-Peter Clausen }
242ef807729SJonathan Cameron EXPORT_SYMBOL_NS_GPL(ad_sd_calibrate, IIO_AD_SIGMA_DELTA);
243af300848SLars-Peter Clausen
244af300848SLars-Peter Clausen /**
245af300848SLars-Peter Clausen * ad_sd_calibrate_all() - Performs channel calibration
246af300848SLars-Peter Clausen * @sigma_delta: The sigma delta device
247af300848SLars-Peter Clausen * @cb: Array of channels and calibration type to perform
248af300848SLars-Peter Clausen * @n: Number of items in cb
249af300848SLars-Peter Clausen *
250af300848SLars-Peter Clausen * Returns 0 on success, an error code otherwise.
251af300848SLars-Peter Clausen **/
ad_sd_calibrate_all(struct ad_sigma_delta * sigma_delta,const struct ad_sd_calib_data * cb,unsigned int n)252af300848SLars-Peter Clausen int ad_sd_calibrate_all(struct ad_sigma_delta *sigma_delta,
253af300848SLars-Peter Clausen const struct ad_sd_calib_data *cb, unsigned int n)
254af300848SLars-Peter Clausen {
255af300848SLars-Peter Clausen unsigned int i;
256af300848SLars-Peter Clausen int ret;
257af300848SLars-Peter Clausen
258af300848SLars-Peter Clausen for (i = 0; i < n; i++) {
259af300848SLars-Peter Clausen ret = ad_sd_calibrate(sigma_delta, cb[i].mode, cb[i].channel);
260af300848SLars-Peter Clausen if (ret)
261af300848SLars-Peter Clausen return ret;
262af300848SLars-Peter Clausen }
263af300848SLars-Peter Clausen
264af300848SLars-Peter Clausen return 0;
265af300848SLars-Peter Clausen }
266ef807729SJonathan Cameron EXPORT_SYMBOL_NS_GPL(ad_sd_calibrate_all, IIO_AD_SIGMA_DELTA);
267af300848SLars-Peter Clausen
268af300848SLars-Peter Clausen /**
269af300848SLars-Peter Clausen * ad_sigma_delta_single_conversion() - Performs a single data conversion
270af300848SLars-Peter Clausen * @indio_dev: The IIO device
271af300848SLars-Peter Clausen * @chan: The conversion is done for this channel
272af300848SLars-Peter Clausen * @val: Pointer to the location where to store the read value
273af300848SLars-Peter Clausen *
274af300848SLars-Peter Clausen * Returns: 0 on success, an error value otherwise.
275af300848SLars-Peter Clausen */
ad_sigma_delta_single_conversion(struct iio_dev * indio_dev,const struct iio_chan_spec * chan,int * val)276af300848SLars-Peter Clausen int ad_sigma_delta_single_conversion(struct iio_dev *indio_dev,
277af300848SLars-Peter Clausen const struct iio_chan_spec *chan, int *val)
278af300848SLars-Peter Clausen {
279af300848SLars-Peter Clausen struct ad_sigma_delta *sigma_delta = iio_device_get_drvdata(indio_dev);
280af300848SLars-Peter Clausen unsigned int sample, raw_sample;
281f0aef2d0SLars-Peter Clausen unsigned int data_reg;
282af300848SLars-Peter Clausen int ret = 0;
283af300848SLars-Peter Clausen
28420228a1dSNuno Sá ret = iio_device_claim_direct_mode(indio_dev);
28520228a1dSNuno Sá if (ret)
28620228a1dSNuno Sá return ret;
287af300848SLars-Peter Clausen
288af300848SLars-Peter Clausen ad_sigma_delta_set_channel(sigma_delta, chan->address);
289af300848SLars-Peter Clausen
2902780e7b7SUwe Kleine-König spi_bus_lock(sigma_delta->spi->controller);
291af300848SLars-Peter Clausen sigma_delta->bus_locked = true;
292df1d80aeSLars-Peter Clausen sigma_delta->keep_cs_asserted = true;
29316735d02SWolfram Sang reinit_completion(&sigma_delta->completion);
294af300848SLars-Peter Clausen
295af300848SLars-Peter Clausen ad_sigma_delta_set_mode(sigma_delta, AD_SD_MODE_SINGLE);
296af300848SLars-Peter Clausen
297af300848SLars-Peter Clausen sigma_delta->irq_dis = false;
2987b0c9f8fSDumitru Ceclan enable_irq(sigma_delta->irq_line);
299af300848SLars-Peter Clausen ret = wait_for_completion_interruptible_timeout(
300af300848SLars-Peter Clausen &sigma_delta->completion, HZ);
301af300848SLars-Peter Clausen
302af300848SLars-Peter Clausen if (ret == 0)
303af300848SLars-Peter Clausen ret = -EIO;
304af300848SLars-Peter Clausen if (ret < 0)
305af300848SLars-Peter Clausen goto out;
306af300848SLars-Peter Clausen
307f0aef2d0SLars-Peter Clausen if (sigma_delta->info->data_reg != 0)
308f0aef2d0SLars-Peter Clausen data_reg = sigma_delta->info->data_reg;
309f0aef2d0SLars-Peter Clausen else
310f0aef2d0SLars-Peter Clausen data_reg = AD_SD_REG_DATA;
311f0aef2d0SLars-Peter Clausen
312f0aef2d0SLars-Peter Clausen ret = ad_sd_read_reg(sigma_delta, data_reg,
313af300848SLars-Peter Clausen DIV_ROUND_UP(chan->scan_type.realbits + chan->scan_type.shift, 8),
314af300848SLars-Peter Clausen &raw_sample);
315af300848SLars-Peter Clausen
316af300848SLars-Peter Clausen out:
317af300848SLars-Peter Clausen if (!sigma_delta->irq_dis) {
3187b0c9f8fSDumitru Ceclan disable_irq_nosync(sigma_delta->irq_line);
319af300848SLars-Peter Clausen sigma_delta->irq_dis = true;
320af300848SLars-Peter Clausen }
321af300848SLars-Peter Clausen
322df1d80aeSLars-Peter Clausen sigma_delta->keep_cs_asserted = false;
323af300848SLars-Peter Clausen ad_sigma_delta_set_mode(sigma_delta, AD_SD_MODE_IDLE);
32498a563deSDumitru Ceclan ad_sigma_delta_disable_one(sigma_delta, chan->address);
325df1d80aeSLars-Peter Clausen sigma_delta->bus_locked = false;
3262780e7b7SUwe Kleine-König spi_bus_unlock(sigma_delta->spi->controller);
32720228a1dSNuno Sá iio_device_release_direct_mode(indio_dev);
328af300848SLars-Peter Clausen
329af300848SLars-Peter Clausen if (ret)
330af300848SLars-Peter Clausen return ret;
331af300848SLars-Peter Clausen
332af300848SLars-Peter Clausen sample = raw_sample >> chan->scan_type.shift;
333af300848SLars-Peter Clausen sample &= (1 << chan->scan_type.realbits) - 1;
334af300848SLars-Peter Clausen *val = sample;
335af300848SLars-Peter Clausen
336af300848SLars-Peter Clausen ret = ad_sigma_delta_postprocess_sample(sigma_delta, raw_sample);
337af300848SLars-Peter Clausen if (ret)
338af300848SLars-Peter Clausen return ret;
339af300848SLars-Peter Clausen
340af300848SLars-Peter Clausen return IIO_VAL_INT;
341af300848SLars-Peter Clausen }
342ef807729SJonathan Cameron EXPORT_SYMBOL_NS_GPL(ad_sigma_delta_single_conversion, IIO_AD_SIGMA_DELTA);
343af300848SLars-Peter Clausen
ad_sd_buffer_postenable(struct iio_dev * indio_dev)344af300848SLars-Peter Clausen static int ad_sd_buffer_postenable(struct iio_dev *indio_dev)
345af300848SLars-Peter Clausen {
346af300848SLars-Peter Clausen struct ad_sigma_delta *sigma_delta = iio_device_get_drvdata(indio_dev);
3478bea9af8SLars-Peter Clausen unsigned int i, slot, samples_buf_size;
348af300848SLars-Peter Clausen unsigned int channel;
3498bea9af8SLars-Peter Clausen uint8_t *samples_buf;
350af300848SLars-Peter Clausen int ret;
351af300848SLars-Peter Clausen
3528bea9af8SLars-Peter Clausen if (sigma_delta->num_slots == 1) {
353af300848SLars-Peter Clausen channel = find_first_bit(indio_dev->active_scan_mask,
354af300848SLars-Peter Clausen indio_dev->masklength);
355af300848SLars-Peter Clausen ret = ad_sigma_delta_set_channel(sigma_delta,
356af300848SLars-Peter Clausen indio_dev->channels[channel].address);
357af300848SLars-Peter Clausen if (ret)
358387c1d77SAlexandru Ardelean return ret;
3598bea9af8SLars-Peter Clausen slot = 1;
3608bea9af8SLars-Peter Clausen } else {
3618bea9af8SLars-Peter Clausen /*
3628bea9af8SLars-Peter Clausen * At this point update_scan_mode already enabled the required channels.
3638bea9af8SLars-Peter Clausen * For sigma-delta sequencer drivers with multiple slots, an update_scan_mode
3648bea9af8SLars-Peter Clausen * implementation is mandatory.
3658bea9af8SLars-Peter Clausen */
3668bea9af8SLars-Peter Clausen slot = 0;
3678bea9af8SLars-Peter Clausen for_each_set_bit(i, indio_dev->active_scan_mask, indio_dev->masklength) {
3688bea9af8SLars-Peter Clausen sigma_delta->slots[slot] = indio_dev->channels[i].address;
3698bea9af8SLars-Peter Clausen slot++;
3708bea9af8SLars-Peter Clausen }
3718bea9af8SLars-Peter Clausen }
3728bea9af8SLars-Peter Clausen
3738bea9af8SLars-Peter Clausen sigma_delta->active_slots = slot;
3748bea9af8SLars-Peter Clausen sigma_delta->current_slot = 0;
3758bea9af8SLars-Peter Clausen
3768bea9af8SLars-Peter Clausen if (sigma_delta->active_slots > 1) {
3778bea9af8SLars-Peter Clausen ret = ad_sigma_delta_append_status(sigma_delta, true);
3788bea9af8SLars-Peter Clausen if (ret)
3798bea9af8SLars-Peter Clausen return ret;
3808bea9af8SLars-Peter Clausen }
3818bea9af8SLars-Peter Clausen
3828bea9af8SLars-Peter Clausen samples_buf_size = ALIGN(slot * indio_dev->channels[0].scan_type.storagebits, 8);
3838bea9af8SLars-Peter Clausen samples_buf_size += sizeof(int64_t);
3848bea9af8SLars-Peter Clausen samples_buf = devm_krealloc(&sigma_delta->spi->dev, sigma_delta->samples_buf,
3858bea9af8SLars-Peter Clausen samples_buf_size, GFP_KERNEL);
3868bea9af8SLars-Peter Clausen if (!samples_buf)
3878bea9af8SLars-Peter Clausen return -ENOMEM;
3888bea9af8SLars-Peter Clausen
3898bea9af8SLars-Peter Clausen sigma_delta->samples_buf = samples_buf;
390af300848SLars-Peter Clausen
3912780e7b7SUwe Kleine-König spi_bus_lock(sigma_delta->spi->controller);
392af300848SLars-Peter Clausen sigma_delta->bus_locked = true;
393df1d80aeSLars-Peter Clausen sigma_delta->keep_cs_asserted = true;
394df1d80aeSLars-Peter Clausen
395af300848SLars-Peter Clausen ret = ad_sigma_delta_set_mode(sigma_delta, AD_SD_MODE_CONTINUOUS);
396af300848SLars-Peter Clausen if (ret)
397af300848SLars-Peter Clausen goto err_unlock;
398af300848SLars-Peter Clausen
399af300848SLars-Peter Clausen sigma_delta->irq_dis = false;
4007b0c9f8fSDumitru Ceclan enable_irq(sigma_delta->irq_line);
401af300848SLars-Peter Clausen
402af300848SLars-Peter Clausen return 0;
403af300848SLars-Peter Clausen
404af300848SLars-Peter Clausen err_unlock:
4052780e7b7SUwe Kleine-König spi_bus_unlock(sigma_delta->spi->controller);
406af300848SLars-Peter Clausen
407af300848SLars-Peter Clausen return ret;
408af300848SLars-Peter Clausen }
409af300848SLars-Peter Clausen
ad_sd_buffer_postdisable(struct iio_dev * indio_dev)410af300848SLars-Peter Clausen static int ad_sd_buffer_postdisable(struct iio_dev *indio_dev)
411af300848SLars-Peter Clausen {
412af300848SLars-Peter Clausen struct ad_sigma_delta *sigma_delta = iio_device_get_drvdata(indio_dev);
413af300848SLars-Peter Clausen
41416735d02SWolfram Sang reinit_completion(&sigma_delta->completion);
415af300848SLars-Peter Clausen wait_for_completion_timeout(&sigma_delta->completion, HZ);
416af300848SLars-Peter Clausen
417af300848SLars-Peter Clausen if (!sigma_delta->irq_dis) {
4187b0c9f8fSDumitru Ceclan disable_irq_nosync(sigma_delta->irq_line);
419af300848SLars-Peter Clausen sigma_delta->irq_dis = true;
420af300848SLars-Peter Clausen }
421af300848SLars-Peter Clausen
422df1d80aeSLars-Peter Clausen sigma_delta->keep_cs_asserted = false;
423af300848SLars-Peter Clausen ad_sigma_delta_set_mode(sigma_delta, AD_SD_MODE_IDLE);
424af300848SLars-Peter Clausen
4258bea9af8SLars-Peter Clausen if (sigma_delta->status_appended)
4268bea9af8SLars-Peter Clausen ad_sigma_delta_append_status(sigma_delta, false);
4278bea9af8SLars-Peter Clausen
4288bea9af8SLars-Peter Clausen ad_sigma_delta_disable_all(sigma_delta);
429af300848SLars-Peter Clausen sigma_delta->bus_locked = false;
4302780e7b7SUwe Kleine-König return spi_bus_unlock(sigma_delta->spi->controller);
431af300848SLars-Peter Clausen }
432af300848SLars-Peter Clausen
ad_sd_trigger_handler(int irq,void * p)433af300848SLars-Peter Clausen static irqreturn_t ad_sd_trigger_handler(int irq, void *p)
434af300848SLars-Peter Clausen {
435af300848SLars-Peter Clausen struct iio_poll_func *pf = p;
436af300848SLars-Peter Clausen struct iio_dev *indio_dev = pf->indio_dev;
437af300848SLars-Peter Clausen struct ad_sigma_delta *sigma_delta = iio_device_get_drvdata(indio_dev);
4380fb6ee8dSLars-Peter Clausen uint8_t *data = sigma_delta->rx_buf;
4398bea9af8SLars-Peter Clausen unsigned int transfer_size;
4408bea9af8SLars-Peter Clausen unsigned int sample_size;
4418bea9af8SLars-Peter Clausen unsigned int sample_pos;
4428bea9af8SLars-Peter Clausen unsigned int status_pos;
443af300848SLars-Peter Clausen unsigned int reg_size;
444f0aef2d0SLars-Peter Clausen unsigned int data_reg;
445af300848SLars-Peter Clausen
446af300848SLars-Peter Clausen reg_size = indio_dev->channels[0].scan_type.realbits +
447af300848SLars-Peter Clausen indio_dev->channels[0].scan_type.shift;
448af300848SLars-Peter Clausen reg_size = DIV_ROUND_UP(reg_size, 8);
449af300848SLars-Peter Clausen
450f0aef2d0SLars-Peter Clausen if (sigma_delta->info->data_reg != 0)
451f0aef2d0SLars-Peter Clausen data_reg = sigma_delta->info->data_reg;
452f0aef2d0SLars-Peter Clausen else
453f0aef2d0SLars-Peter Clausen data_reg = AD_SD_REG_DATA;
454f0aef2d0SLars-Peter Clausen
4558bea9af8SLars-Peter Clausen /* Status word will be appended to the sample during transfer */
4568bea9af8SLars-Peter Clausen if (sigma_delta->status_appended)
4578bea9af8SLars-Peter Clausen transfer_size = reg_size + 1;
4588bea9af8SLars-Peter Clausen else
4598bea9af8SLars-Peter Clausen transfer_size = reg_size;
4608bea9af8SLars-Peter Clausen
461af300848SLars-Peter Clausen switch (reg_size) {
462af300848SLars-Peter Clausen case 4:
463af300848SLars-Peter Clausen case 2:
464af300848SLars-Peter Clausen case 1:
4658bea9af8SLars-Peter Clausen status_pos = reg_size;
4668bea9af8SLars-Peter Clausen ad_sd_read_reg_raw(sigma_delta, data_reg, transfer_size, &data[0]);
467af300848SLars-Peter Clausen break;
468af300848SLars-Peter Clausen case 3:
4698bea9af8SLars-Peter Clausen /*
4708bea9af8SLars-Peter Clausen * Data array after transfer will look like (if status is appended):
4718bea9af8SLars-Peter Clausen * data[] = { [0][sample][sample][sample][status] }
4728bea9af8SLars-Peter Clausen * Keeping the first byte 0 shifts the status postion by 1 byte to the right.
4738bea9af8SLars-Peter Clausen */
4748bea9af8SLars-Peter Clausen status_pos = reg_size + 1;
4758bea9af8SLars-Peter Clausen
476af300848SLars-Peter Clausen /* We store 24 bit samples in a 32 bit word. Keep the upper
477af300848SLars-Peter Clausen * byte set to zero. */
4788bea9af8SLars-Peter Clausen ad_sd_read_reg_raw(sigma_delta, data_reg, transfer_size, &data[1]);
479af300848SLars-Peter Clausen break;
480af300848SLars-Peter Clausen }
481af300848SLars-Peter Clausen
4828bea9af8SLars-Peter Clausen /*
4838bea9af8SLars-Peter Clausen * For devices sampling only one channel at
4848bea9af8SLars-Peter Clausen * once, there is no need for sample number tracking.
4858bea9af8SLars-Peter Clausen */
4868bea9af8SLars-Peter Clausen if (sigma_delta->active_slots == 1) {
487a1be505fSLars-Peter Clausen iio_push_to_buffers_with_timestamp(indio_dev, data, pf->timestamp);
4888bea9af8SLars-Peter Clausen goto irq_handled;
4898bea9af8SLars-Peter Clausen }
490af300848SLars-Peter Clausen
4918bea9af8SLars-Peter Clausen if (sigma_delta->status_appended) {
4928bea9af8SLars-Peter Clausen u8 converted_channel;
4938bea9af8SLars-Peter Clausen
4948bea9af8SLars-Peter Clausen converted_channel = data[status_pos] & sigma_delta->info->status_ch_mask;
4958bea9af8SLars-Peter Clausen if (converted_channel != sigma_delta->slots[sigma_delta->current_slot]) {
4968bea9af8SLars-Peter Clausen /*
4978bea9af8SLars-Peter Clausen * Desync occurred during continuous sampling of multiple channels.
4988bea9af8SLars-Peter Clausen * Drop this incomplete sample and start from first channel again.
4998bea9af8SLars-Peter Clausen */
5008bea9af8SLars-Peter Clausen
5018bea9af8SLars-Peter Clausen sigma_delta->current_slot = 0;
5028bea9af8SLars-Peter Clausen goto irq_handled;
5038bea9af8SLars-Peter Clausen }
5048bea9af8SLars-Peter Clausen }
5058bea9af8SLars-Peter Clausen
5068bea9af8SLars-Peter Clausen sample_size = indio_dev->channels[0].scan_type.storagebits / 8;
5078bea9af8SLars-Peter Clausen sample_pos = sample_size * sigma_delta->current_slot;
5088bea9af8SLars-Peter Clausen memcpy(&sigma_delta->samples_buf[sample_pos], data, sample_size);
5098bea9af8SLars-Peter Clausen sigma_delta->current_slot++;
5108bea9af8SLars-Peter Clausen
5118bea9af8SLars-Peter Clausen if (sigma_delta->current_slot == sigma_delta->active_slots) {
5128bea9af8SLars-Peter Clausen sigma_delta->current_slot = 0;
5138bea9af8SLars-Peter Clausen iio_push_to_buffers_with_timestamp(indio_dev, sigma_delta->samples_buf,
5148bea9af8SLars-Peter Clausen pf->timestamp);
5158bea9af8SLars-Peter Clausen }
5168bea9af8SLars-Peter Clausen
5178bea9af8SLars-Peter Clausen irq_handled:
518af300848SLars-Peter Clausen iio_trigger_notify_done(indio_dev->trig);
519af300848SLars-Peter Clausen sigma_delta->irq_dis = false;
5207b0c9f8fSDumitru Ceclan enable_irq(sigma_delta->irq_line);
521af300848SLars-Peter Clausen
522af300848SLars-Peter Clausen return IRQ_HANDLED;
523af300848SLars-Peter Clausen }
524af300848SLars-Peter Clausen
ad_sd_validate_scan_mask(struct iio_dev * indio_dev,const unsigned long * mask)5258bea9af8SLars-Peter Clausen static bool ad_sd_validate_scan_mask(struct iio_dev *indio_dev, const unsigned long *mask)
5268bea9af8SLars-Peter Clausen {
5278bea9af8SLars-Peter Clausen struct ad_sigma_delta *sigma_delta = iio_device_get_drvdata(indio_dev);
5288bea9af8SLars-Peter Clausen
5298bea9af8SLars-Peter Clausen return bitmap_weight(mask, indio_dev->masklength) <= sigma_delta->num_slots;
5308bea9af8SLars-Peter Clausen }
5318bea9af8SLars-Peter Clausen
532af300848SLars-Peter Clausen static const struct iio_buffer_setup_ops ad_sd_buffer_setup_ops = {
533af300848SLars-Peter Clausen .postenable = &ad_sd_buffer_postenable,
534af300848SLars-Peter Clausen .postdisable = &ad_sd_buffer_postdisable,
5358bea9af8SLars-Peter Clausen .validate_scan_mask = &ad_sd_validate_scan_mask,
536af300848SLars-Peter Clausen };
537af300848SLars-Peter Clausen
ad_sd_data_rdy_trig_poll(int irq,void * private)538af300848SLars-Peter Clausen static irqreturn_t ad_sd_data_rdy_trig_poll(int irq, void *private)
539af300848SLars-Peter Clausen {
540af300848SLars-Peter Clausen struct ad_sigma_delta *sigma_delta = private;
541af300848SLars-Peter Clausen
542af300848SLars-Peter Clausen complete(&sigma_delta->completion);
543af300848SLars-Peter Clausen disable_irq_nosync(irq);
544af300848SLars-Peter Clausen sigma_delta->irq_dis = true;
545398fd22bSPeter Meerwald iio_trigger_poll(sigma_delta->trig);
546af300848SLars-Peter Clausen
547af300848SLars-Peter Clausen return IRQ_HANDLED;
548af300848SLars-Peter Clausen }
549af300848SLars-Peter Clausen
550af300848SLars-Peter Clausen /**
551af300848SLars-Peter Clausen * ad_sd_validate_trigger() - validate_trigger callback for ad_sigma_delta devices
552af300848SLars-Peter Clausen * @indio_dev: The IIO device
553af300848SLars-Peter Clausen * @trig: The new trigger
554af300848SLars-Peter Clausen *
555af300848SLars-Peter Clausen * Returns: 0 if the 'trig' matches the trigger registered by the ad_sigma_delta
556af300848SLars-Peter Clausen * device, -EINVAL otherwise.
557af300848SLars-Peter Clausen */
ad_sd_validate_trigger(struct iio_dev * indio_dev,struct iio_trigger * trig)558af300848SLars-Peter Clausen int ad_sd_validate_trigger(struct iio_dev *indio_dev, struct iio_trigger *trig)
559af300848SLars-Peter Clausen {
560af300848SLars-Peter Clausen struct ad_sigma_delta *sigma_delta = iio_device_get_drvdata(indio_dev);
561af300848SLars-Peter Clausen
562af300848SLars-Peter Clausen if (sigma_delta->trig != trig)
563af300848SLars-Peter Clausen return -EINVAL;
564af300848SLars-Peter Clausen
565af300848SLars-Peter Clausen return 0;
566af300848SLars-Peter Clausen }
567ef807729SJonathan Cameron EXPORT_SYMBOL_NS_GPL(ad_sd_validate_trigger, IIO_AD_SIGMA_DELTA);
568af300848SLars-Peter Clausen
devm_ad_sd_probe_trigger(struct device * dev,struct iio_dev * indio_dev)569718fb2bcSAlexandru Ardelean static int devm_ad_sd_probe_trigger(struct device *dev, struct iio_dev *indio_dev)
570718fb2bcSAlexandru Ardelean {
571718fb2bcSAlexandru Ardelean struct ad_sigma_delta *sigma_delta = iio_device_get_drvdata(indio_dev);
572*e81bb580SNuno Sa unsigned long irq_flags = irq_get_trigger_type(sigma_delta->irq_line);
573718fb2bcSAlexandru Ardelean int ret;
574718fb2bcSAlexandru Ardelean
575718fb2bcSAlexandru Ardelean if (dev != &sigma_delta->spi->dev) {
576718fb2bcSAlexandru Ardelean dev_err(dev, "Trigger parent should be '%s', got '%s'\n",
577718fb2bcSAlexandru Ardelean dev_name(dev), dev_name(&sigma_delta->spi->dev));
578718fb2bcSAlexandru Ardelean return -EFAULT;
579718fb2bcSAlexandru Ardelean }
580718fb2bcSAlexandru Ardelean
581718fb2bcSAlexandru Ardelean sigma_delta->trig = devm_iio_trigger_alloc(dev, "%s-dev%d", indio_dev->name,
582718fb2bcSAlexandru Ardelean iio_device_id(indio_dev));
583718fb2bcSAlexandru Ardelean if (sigma_delta->trig == NULL)
584718fb2bcSAlexandru Ardelean return -ENOMEM;
585718fb2bcSAlexandru Ardelean
586718fb2bcSAlexandru Ardelean init_completion(&sigma_delta->completion);
587718fb2bcSAlexandru Ardelean
588718fb2bcSAlexandru Ardelean sigma_delta->irq_dis = true;
589626d3120SMasahiro Honda
590626d3120SMasahiro Honda /* the IRQ core clears IRQ_DISABLE_UNLAZY flag when freeing an IRQ */
5917b0c9f8fSDumitru Ceclan irq_set_status_flags(sigma_delta->irq_line, IRQ_DISABLE_UNLAZY);
592626d3120SMasahiro Honda
5931ca53b5dSNuno Sa /* Allow overwriting the flags from firmware */
5941ca53b5dSNuno Sa if (!irq_flags)
5951ca53b5dSNuno Sa irq_flags = sigma_delta->info->irq_flags;
5961ca53b5dSNuno Sa
5977b0c9f8fSDumitru Ceclan ret = devm_request_irq(dev, sigma_delta->irq_line,
598718fb2bcSAlexandru Ardelean ad_sd_data_rdy_trig_poll,
5991ca53b5dSNuno Sa irq_flags | IRQF_NO_AUTOEN,
600718fb2bcSAlexandru Ardelean indio_dev->name,
601718fb2bcSAlexandru Ardelean sigma_delta);
602718fb2bcSAlexandru Ardelean if (ret)
603718fb2bcSAlexandru Ardelean return ret;
604718fb2bcSAlexandru Ardelean
605718fb2bcSAlexandru Ardelean iio_trigger_set_drvdata(sigma_delta->trig, sigma_delta);
606718fb2bcSAlexandru Ardelean
607718fb2bcSAlexandru Ardelean ret = devm_iio_trigger_register(dev, sigma_delta->trig);
608718fb2bcSAlexandru Ardelean if (ret)
609718fb2bcSAlexandru Ardelean return ret;
610718fb2bcSAlexandru Ardelean
611718fb2bcSAlexandru Ardelean /* select default trigger */
612718fb2bcSAlexandru Ardelean indio_dev->trig = iio_trigger_get(sigma_delta->trig);
613718fb2bcSAlexandru Ardelean
614718fb2bcSAlexandru Ardelean return 0;
615718fb2bcSAlexandru Ardelean }
616718fb2bcSAlexandru Ardelean
617af300848SLars-Peter Clausen /**
618718fb2bcSAlexandru Ardelean * devm_ad_sd_setup_buffer_and_trigger() - Device-managed buffer & trigger setup
619718fb2bcSAlexandru Ardelean * @dev: Device object to which to bind the life-time of the resources attached
620718fb2bcSAlexandru Ardelean * @indio_dev: The IIO device
621718fb2bcSAlexandru Ardelean */
devm_ad_sd_setup_buffer_and_trigger(struct device * dev,struct iio_dev * indio_dev)622718fb2bcSAlexandru Ardelean int devm_ad_sd_setup_buffer_and_trigger(struct device *dev, struct iio_dev *indio_dev)
623718fb2bcSAlexandru Ardelean {
6248bea9af8SLars-Peter Clausen struct ad_sigma_delta *sigma_delta = iio_device_get_drvdata(indio_dev);
625718fb2bcSAlexandru Ardelean int ret;
626718fb2bcSAlexandru Ardelean
6278bea9af8SLars-Peter Clausen sigma_delta->slots = devm_kcalloc(dev, sigma_delta->num_slots,
6288bea9af8SLars-Peter Clausen sizeof(*sigma_delta->slots), GFP_KERNEL);
6298bea9af8SLars-Peter Clausen if (!sigma_delta->slots)
6308bea9af8SLars-Peter Clausen return -ENOMEM;
6318bea9af8SLars-Peter Clausen
632718fb2bcSAlexandru Ardelean ret = devm_iio_triggered_buffer_setup(dev, indio_dev,
633718fb2bcSAlexandru Ardelean &iio_pollfunc_store_time,
634718fb2bcSAlexandru Ardelean &ad_sd_trigger_handler,
635718fb2bcSAlexandru Ardelean &ad_sd_buffer_setup_ops);
636718fb2bcSAlexandru Ardelean if (ret)
637718fb2bcSAlexandru Ardelean return ret;
638718fb2bcSAlexandru Ardelean
639718fb2bcSAlexandru Ardelean return devm_ad_sd_probe_trigger(dev, indio_dev);
640718fb2bcSAlexandru Ardelean }
641ef807729SJonathan Cameron EXPORT_SYMBOL_NS_GPL(devm_ad_sd_setup_buffer_and_trigger, IIO_AD_SIGMA_DELTA);
642718fb2bcSAlexandru Ardelean
643718fb2bcSAlexandru Ardelean /**
644af300848SLars-Peter Clausen * ad_sd_init() - Initializes a ad_sigma_delta struct
645af300848SLars-Peter Clausen * @sigma_delta: The ad_sigma_delta device
646af300848SLars-Peter Clausen * @indio_dev: The IIO device which the Sigma Delta device is used for
647af300848SLars-Peter Clausen * @spi: The SPI device for the ad_sigma_delta device
648af300848SLars-Peter Clausen * @info: Device specific callbacks and options
649af300848SLars-Peter Clausen *
650af300848SLars-Peter Clausen * This function needs to be called before any other operations are performed on
651af300848SLars-Peter Clausen * the ad_sigma_delta struct.
652af300848SLars-Peter Clausen */
ad_sd_init(struct ad_sigma_delta * sigma_delta,struct iio_dev * indio_dev,struct spi_device * spi,const struct ad_sigma_delta_info * info)653af300848SLars-Peter Clausen int ad_sd_init(struct ad_sigma_delta *sigma_delta, struct iio_dev *indio_dev,
654af300848SLars-Peter Clausen struct spi_device *spi, const struct ad_sigma_delta_info *info)
655af300848SLars-Peter Clausen {
656af300848SLars-Peter Clausen sigma_delta->spi = spi;
657af300848SLars-Peter Clausen sigma_delta->info = info;
6588bea9af8SLars-Peter Clausen
6598bea9af8SLars-Peter Clausen /* If the field is unset in ad_sigma_delta_info, asume there can only be 1 slot. */
6608bea9af8SLars-Peter Clausen if (!info->num_slots)
6618bea9af8SLars-Peter Clausen sigma_delta->num_slots = 1;
6628bea9af8SLars-Peter Clausen else
6638bea9af8SLars-Peter Clausen sigma_delta->num_slots = info->num_slots;
6648bea9af8SLars-Peter Clausen
6658bea9af8SLars-Peter Clausen if (sigma_delta->num_slots > 1) {
6668bea9af8SLars-Peter Clausen if (!indio_dev->info->update_scan_mode) {
6678bea9af8SLars-Peter Clausen dev_err(&spi->dev, "iio_dev lacks update_scan_mode().\n");
6688bea9af8SLars-Peter Clausen return -EINVAL;
6698bea9af8SLars-Peter Clausen }
6708bea9af8SLars-Peter Clausen
6718bea9af8SLars-Peter Clausen if (!info->disable_all) {
6728bea9af8SLars-Peter Clausen dev_err(&spi->dev, "ad_sigma_delta_info lacks disable_all().\n");
6738bea9af8SLars-Peter Clausen return -EINVAL;
6748bea9af8SLars-Peter Clausen }
6758bea9af8SLars-Peter Clausen }
6768bea9af8SLars-Peter Clausen
6777b0c9f8fSDumitru Ceclan if (info->irq_line)
6787b0c9f8fSDumitru Ceclan sigma_delta->irq_line = info->irq_line;
6797b0c9f8fSDumitru Ceclan else
6807b0c9f8fSDumitru Ceclan sigma_delta->irq_line = spi->irq;
6817b0c9f8fSDumitru Ceclan
682af300848SLars-Peter Clausen iio_device_set_drvdata(indio_dev, sigma_delta);
683af300848SLars-Peter Clausen
684af300848SLars-Peter Clausen return 0;
685af300848SLars-Peter Clausen }
686ef807729SJonathan Cameron EXPORT_SYMBOL_NS_GPL(ad_sd_init, IIO_AD_SIGMA_DELTA);
687af300848SLars-Peter Clausen
688af300848SLars-Peter Clausen MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
689af300848SLars-Peter Clausen MODULE_DESCRIPTION("Analog Devices Sigma-Delta ADCs");
690af300848SLars-Peter Clausen MODULE_LICENSE("GPL v2");
691