1 // SPDX-License-Identifier: GPL-2.0
3 * Driver for Microchip MCP3911, Two-channel Analog Front End
5 * Copyright (C) 2018 Marcus Folkesson <marcus.folkesson@gmail.com>
6 * Copyright (C) 2018 Kent Gustavsson <kent@minoris.se>
8 #include <linux/bitfield.h>
9 #include <linux/bits.h>
10 #include <linux/cleanup.h>
11 #include <linux/clk.h>
12 #include <linux/delay.h>
13 #include <linux/err.h>
14 #include <linux/module.h>
15 #include <linux/mod_devicetable.h>
16 #include <linux/property.h>
17 #include <linux/regulator/consumer.h>
18 #include <linux/spi/spi.h>
20 #include <linux/iio/iio.h>
21 #include <linux/iio/buffer.h>
22 #include <linux/iio/triggered_buffer.h>
23 #include <linux/iio/trigger_consumer.h>
24 #include <linux/iio/trigger.h>
26 #include <asm/unaligned.h>
28 #define MCP3911_REG_CHANNEL0 0x00
29 #define MCP3911_REG_CHANNEL1 0x03
30 #define MCP3911_REG_MOD 0x06
31 #define MCP3911_REG_PHASE 0x07
32 #define MCP3911_REG_GAIN 0x09
33 #define MCP3911_GAIN_MASK(ch) (GENMASK(2, 0) << 3 * (ch))
34 #define MCP3911_GAIN_VAL(ch, val) ((val << 3 * (ch)) & MCP3911_GAIN_MASK(ch))
36 #define MCP3911_REG_STATUSCOM 0x0a
37 #define MCP3911_STATUSCOM_DRHIZ BIT(12)
38 #define MCP3911_STATUSCOM_READ GENMASK(7, 6)
39 #define MCP3911_STATUSCOM_CH1_24WIDTH BIT(4)
40 #define MCP3911_STATUSCOM_CH0_24WIDTH BIT(3)
41 #define MCP3911_STATUSCOM_EN_OFFCAL BIT(2)
42 #define MCP3911_STATUSCOM_EN_GAINCAL BIT(1)
44 #define MCP3911_REG_CONFIG 0x0c
45 #define MCP3911_CONFIG_CLKEXT BIT(1)
46 #define MCP3911_CONFIG_VREFEXT BIT(2)
47 #define MCP3911_CONFIG_OSR GENMASK(13, 11)
49 #define MCP3911_REG_OFFCAL_CH0 0x0e
50 #define MCP3911_REG_GAINCAL_CH0 0x11
51 #define MCP3911_REG_OFFCAL_CH1 0x14
52 #define MCP3911_REG_GAINCAL_CH1 0x17
53 #define MCP3911_REG_VREFCAL 0x1a
55 #define MCP3911_CHANNEL(ch) (MCP3911_REG_CHANNEL0 + (ch) * 3)
56 #define MCP3911_OFFCAL(ch) (MCP3911_REG_OFFCAL_CH0 + (ch) * 6)
58 /* Internal voltage reference in mV */
59 #define MCP3911_INT_VREF_MV 1200
61 #define MCP3911_REG_READ(reg, id) ((((reg) << 1) | ((id) << 6) | (1 << 0)) & 0xff)
62 #define MCP3911_REG_WRITE(reg, id) ((((reg) << 1) | ((id) << 6) | (0 << 0)) & 0xff)
63 #define MCP3911_REG_MASK GENMASK(4, 1)
65 #define MCP3911_NUM_SCALES 6
67 /* Registers compatible with MCP3910 */
68 #define MCP3910_REG_STATUSCOM 0x0c
69 #define MCP3910_STATUSCOM_READ GENMASK(23, 22)
70 #define MCP3910_STATUSCOM_DRHIZ BIT(20)
72 #define MCP3910_REG_GAIN 0x0b
74 #define MCP3910_REG_CONFIG0 0x0d
75 #define MCP3910_CONFIG0_EN_OFFCAL BIT(23)
76 #define MCP3910_CONFIG0_OSR GENMASK(15, 13)
78 #define MCP3910_REG_CONFIG1 0x0e
79 #define MCP3910_CONFIG1_CLKEXT BIT(6)
80 #define MCP3910_CONFIG1_VREFEXT BIT(7)
82 #define MCP3910_REG_OFFCAL_CH0 0x0f
83 #define MCP3910_OFFCAL(ch) (MCP3910_REG_OFFCAL_CH0 + (ch) * 6)
85 /* Maximal number of channels used by the MCP39XX family */
86 #define MCP39XX_MAX_NUM_CHANNELS 8
88 static const int mcp3911_osr_table[] = { 32, 64, 128, 256, 512, 1024, 2048, 4096 };
89 static u32 mcp3911_scale_table[MCP3911_NUM_SCALES][2];
102 struct mcp3911_chip_info {
103 const struct iio_chan_spec *channels;
104 unsigned int num_channels;
106 int (*config)(struct mcp3911 *adc);
107 int (*get_osr)(struct mcp3911 *adc, u32 *val);
108 int (*set_osr)(struct mcp3911 *adc, u32 val);
109 int (*enable_offset)(struct mcp3911 *adc, bool enable);
110 int (*get_offset)(struct mcp3911 *adc, int channel, int *val);
111 int (*set_offset)(struct mcp3911 *adc, int channel, int val);
112 int (*set_scale)(struct mcp3911 *adc, int channel, u32 val);
116 struct spi_device *spi;
118 struct regulator *vref;
121 struct iio_trigger *trig;
122 u32 gain[MCP39XX_MAX_NUM_CHANNELS];
123 const struct mcp3911_chip_info *chip;
125 u32 channels[MCP39XX_MAX_NUM_CHANNELS];
129 u8 tx_buf __aligned(IIO_DMA_MINALIGN);
130 u8 rx_buf[MCP39XX_MAX_NUM_CHANNELS * 3];
133 static int mcp3911_read(struct mcp3911 *adc, u8 reg, u32 *val, u8 len)
137 reg = MCP3911_REG_READ(reg, adc->dev_addr);
138 ret = spi_write_then_read(adc->spi, ®, 1, val, len);
143 *val >>= ((4 - len) * 8);
144 dev_dbg(&adc->spi->dev, "reading 0x%x from register 0x%lx\n", *val,
145 FIELD_GET(MCP3911_REG_MASK, reg));
149 static int mcp3911_write(struct mcp3911 *adc, u8 reg, u32 val, u8 len)
151 dev_dbg(&adc->spi->dev, "writing 0x%x to register 0x%x\n", val, reg);
153 val <<= (3 - len) * 8;
155 val |= MCP3911_REG_WRITE(reg, adc->dev_addr);
157 return spi_write(adc->spi, &val, len + 1);
160 static int mcp3911_update(struct mcp3911 *adc, u8 reg, u32 mask, u32 val, u8 len)
165 ret = mcp3911_read(adc, reg, &tmp, len);
171 return mcp3911_write(adc, reg, val, len);
174 static int mcp3910_enable_offset(struct mcp3911 *adc, bool enable)
176 unsigned int mask = MCP3910_CONFIG0_EN_OFFCAL;
177 unsigned int value = enable ? mask : 0;
179 return mcp3911_update(adc, MCP3910_REG_CONFIG0, mask, value, 3);
182 static int mcp3910_get_offset(struct mcp3911 *adc, int channel, int *val)
184 return mcp3911_read(adc, MCP3910_OFFCAL(channel), val, 3);
187 static int mcp3910_set_offset(struct mcp3911 *adc, int channel, int val)
191 ret = mcp3911_write(adc, MCP3910_OFFCAL(channel), val, 3);
195 return adc->chip->enable_offset(adc, 1);
198 static int mcp3911_enable_offset(struct mcp3911 *adc, bool enable)
200 unsigned int mask = MCP3911_STATUSCOM_EN_OFFCAL;
201 unsigned int value = enable ? mask : 0;
203 return mcp3911_update(adc, MCP3911_REG_STATUSCOM, mask, value, 2);
206 static int mcp3911_get_offset(struct mcp3911 *adc, int channel, int *val)
208 return mcp3911_read(adc, MCP3911_OFFCAL(channel), val, 3);
211 static int mcp3911_set_offset(struct mcp3911 *adc, int channel, int val)
215 ret = mcp3911_write(adc, MCP3911_OFFCAL(channel), val, 3);
219 return adc->chip->enable_offset(adc, 1);
222 static int mcp3910_get_osr(struct mcp3911 *adc, u32 *val)
227 ret = mcp3911_read(adc, MCP3910_REG_CONFIG0, val, 3);
231 osr = FIELD_GET(MCP3910_CONFIG0_OSR, *val);
236 static int mcp3910_set_osr(struct mcp3911 *adc, u32 val)
238 unsigned int osr = FIELD_PREP(MCP3910_CONFIG0_OSR, val);
239 unsigned int mask = MCP3910_CONFIG0_OSR;
241 return mcp3911_update(adc, MCP3910_REG_CONFIG0, mask, osr, 3);
244 static int mcp3911_set_osr(struct mcp3911 *adc, u32 val)
246 unsigned int osr = FIELD_PREP(MCP3911_CONFIG_OSR, val);
247 unsigned int mask = MCP3911_CONFIG_OSR;
249 return mcp3911_update(adc, MCP3911_REG_CONFIG, mask, osr, 2);
252 static int mcp3911_get_osr(struct mcp3911 *adc, u32 *val)
257 ret = mcp3911_read(adc, MCP3911_REG_CONFIG, val, 2);
261 osr = FIELD_GET(MCP3911_CONFIG_OSR, *val);
266 static int mcp3910_set_scale(struct mcp3911 *adc, int channel, u32 val)
268 return mcp3911_update(adc, MCP3910_REG_GAIN,
269 MCP3911_GAIN_MASK(channel),
270 MCP3911_GAIN_VAL(channel, val), 3);
273 static int mcp3911_set_scale(struct mcp3911 *adc, int channel, u32 val)
275 return mcp3911_update(adc, MCP3911_REG_GAIN,
276 MCP3911_GAIN_MASK(channel),
277 MCP3911_GAIN_VAL(channel, val), 1);
280 static int mcp3911_write_raw_get_fmt(struct iio_dev *indio_dev,
281 struct iio_chan_spec const *chan,
285 case IIO_CHAN_INFO_SCALE:
286 return IIO_VAL_INT_PLUS_NANO;
287 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
290 return IIO_VAL_INT_PLUS_NANO;
294 static int mcp3911_read_avail(struct iio_dev *indio_dev,
295 struct iio_chan_spec const *chan,
296 const int **vals, int *type, int *length,
300 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
302 *vals = mcp3911_osr_table;
303 *length = ARRAY_SIZE(mcp3911_osr_table);
304 return IIO_AVAIL_LIST;
305 case IIO_CHAN_INFO_SCALE:
306 *type = IIO_VAL_INT_PLUS_NANO;
307 *vals = (int *)mcp3911_scale_table;
308 *length = ARRAY_SIZE(mcp3911_scale_table) * 2;
309 return IIO_AVAIL_LIST;
315 static int mcp3911_read_raw(struct iio_dev *indio_dev,
316 struct iio_chan_spec const *channel, int *val,
317 int *val2, long mask)
319 struct mcp3911 *adc = iio_priv(indio_dev);
322 guard(mutex)(&adc->lock);
324 case IIO_CHAN_INFO_RAW:
325 ret = mcp3911_read(adc,
326 MCP3911_CHANNEL(channel->channel), val, 3);
330 *val = sign_extend32(*val, 23);
332 case IIO_CHAN_INFO_OFFSET:
333 ret = adc->chip->get_offset(adc, channel->channel, val);
338 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
339 ret = adc->chip->get_osr(adc, val);
344 case IIO_CHAN_INFO_SCALE:
345 *val = mcp3911_scale_table[ilog2(adc->gain[channel->channel])][0];
346 *val2 = mcp3911_scale_table[ilog2(adc->gain[channel->channel])][1];
347 return IIO_VAL_INT_PLUS_NANO;
353 static int mcp3911_write_raw(struct iio_dev *indio_dev,
354 struct iio_chan_spec const *channel, int val,
357 struct mcp3911 *adc = iio_priv(indio_dev);
359 guard(mutex)(&adc->lock);
361 case IIO_CHAN_INFO_SCALE:
362 for (int i = 0; i < MCP3911_NUM_SCALES; i++) {
363 if (val == mcp3911_scale_table[i][0] &&
364 val2 == mcp3911_scale_table[i][1]) {
366 adc->gain[channel->channel] = BIT(i);
367 return adc->chip->set_scale(adc, channel->channel, i);
371 case IIO_CHAN_INFO_OFFSET:
375 return adc->chip->set_offset(adc, channel->channel, val);
376 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
377 for (int i = 0; i < ARRAY_SIZE(mcp3911_osr_table); i++) {
378 if (val == mcp3911_osr_table[i]) {
379 return adc->chip->set_osr(adc, i);
388 static int mcp3911_calc_scale_table(struct mcp3911 *adc)
390 struct device *dev = &adc->spi->dev;
391 u32 ref = MCP3911_INT_VREF_MV;
397 ret = regulator_get_voltage(adc->vref);
399 return dev_err_probe(dev, ret, "failed to get vref voltage\n");
406 * For 24-bit Conversion
407 * Raw = ((Voltage)/(Vref) * 2^23 * Gain * 1.5
408 * Voltage = Raw * (Vref)/(2^23 * Gain * 1.5)
410 * ref = Reference voltage
411 * div = (2^23 * 1.5 * gain) = 12582912 * gain
413 for (int i = 0; i < MCP3911_NUM_SCALES; i++) {
414 div = 12582912 * BIT(i);
415 tmp = div_s64((s64)ref * 1000000000LL, div);
417 mcp3911_scale_table[i][0] = 0;
418 mcp3911_scale_table[i][1] = tmp;
424 #define MCP3911_CHAN(idx) { \
425 .type = IIO_VOLTAGE, \
429 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \
430 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
431 BIT(IIO_CHAN_INFO_OFFSET) | \
432 BIT(IIO_CHAN_INFO_SCALE), \
433 .info_mask_shared_by_type_available = \
434 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \
435 .info_mask_separate_available = \
436 BIT(IIO_CHAN_INFO_SCALE), \
441 .endianness = IIO_BE, \
445 static const struct iio_chan_spec mcp3910_channels[] = {
448 IIO_CHAN_SOFT_TIMESTAMP(2),
451 static const struct iio_chan_spec mcp3911_channels[] = {
454 IIO_CHAN_SOFT_TIMESTAMP(2),
457 static const struct iio_chan_spec mcp3912_channels[] = {
462 IIO_CHAN_SOFT_TIMESTAMP(4),
465 static const struct iio_chan_spec mcp3913_channels[] = {
472 IIO_CHAN_SOFT_TIMESTAMP(6),
475 static const struct iio_chan_spec mcp3914_channels[] = {
484 IIO_CHAN_SOFT_TIMESTAMP(8),
487 static const struct iio_chan_spec mcp3918_channels[] = {
489 IIO_CHAN_SOFT_TIMESTAMP(1),
492 static const struct iio_chan_spec mcp3919_channels[] = {
496 IIO_CHAN_SOFT_TIMESTAMP(3),
499 static irqreturn_t mcp3911_trigger_handler(int irq, void *p)
501 struct iio_poll_func *pf = p;
502 struct iio_dev *indio_dev = pf->indio_dev;
503 struct mcp3911 *adc = iio_priv(indio_dev);
504 struct device *dev = &adc->spi->dev;
505 struct spi_transfer xfer[] = {
507 .tx_buf = &adc->tx_buf,
510 .rx_buf = adc->rx_buf,
511 .len = (adc->chip->num_channels - 1) * 3,
518 guard(mutex)(&adc->lock);
519 adc->tx_buf = MCP3911_REG_READ(MCP3911_CHANNEL(0), adc->dev_addr);
520 ret = spi_sync_transfer(adc->spi, xfer, ARRAY_SIZE(xfer));
522 dev_warn(dev, "failed to get conversion data\n");
526 for_each_set_bit(scan_index, indio_dev->active_scan_mask, indio_dev->masklength) {
527 const struct iio_chan_spec *scan_chan = &indio_dev->channels[scan_index];
529 adc->scan.channels[i] = get_unaligned_be24(&adc->rx_buf[scan_chan->channel * 3]);
532 iio_push_to_buffers_with_timestamp(indio_dev, &adc->scan,
533 iio_get_time_ns(indio_dev));
535 iio_trigger_notify_done(indio_dev->trig);
540 static const struct iio_info mcp3911_info = {
541 .read_raw = mcp3911_read_raw,
542 .write_raw = mcp3911_write_raw,
543 .read_avail = mcp3911_read_avail,
544 .write_raw_get_fmt = mcp3911_write_raw_get_fmt,
547 static int mcp3911_config(struct mcp3911 *adc)
549 struct device *dev = &adc->spi->dev;
553 ret = mcp3911_read(adc, MCP3911_REG_CONFIG, ®val, 2);
557 regval &= ~MCP3911_CONFIG_VREFEXT;
559 dev_dbg(dev, "use external voltage reference\n");
560 regval |= FIELD_PREP(MCP3911_CONFIG_VREFEXT, 1);
562 dev_dbg(dev, "use internal voltage reference (1.2V)\n");
563 regval |= FIELD_PREP(MCP3911_CONFIG_VREFEXT, 0);
566 regval &= ~MCP3911_CONFIG_CLKEXT;
568 dev_dbg(dev, "use external clock as clocksource\n");
569 regval |= FIELD_PREP(MCP3911_CONFIG_CLKEXT, 1);
571 dev_dbg(dev, "use crystal oscillator as clocksource\n");
572 regval |= FIELD_PREP(MCP3911_CONFIG_CLKEXT, 0);
575 ret = mcp3911_write(adc, MCP3911_REG_CONFIG, regval, 2);
579 ret = mcp3911_read(adc, MCP3911_REG_STATUSCOM, ®val, 2);
583 /* Address counter incremented, cycle through register types */
584 regval &= ~MCP3911_STATUSCOM_READ;
585 regval |= FIELD_PREP(MCP3911_STATUSCOM_READ, 0x02);
587 regval &= ~MCP3911_STATUSCOM_DRHIZ;
588 if (device_property_read_bool(dev, "microchip,data-ready-hiz"))
589 regval |= FIELD_PREP(MCP3911_STATUSCOM_DRHIZ, 0);
591 regval |= FIELD_PREP(MCP3911_STATUSCOM_DRHIZ, 1);
593 /* Disable offset to ignore any old values in offset register */
594 regval &= ~MCP3911_STATUSCOM_EN_OFFCAL;
596 ret = mcp3911_write(adc, MCP3911_REG_STATUSCOM, regval, 2);
600 /* Set gain to 1 for all channels */
601 ret = mcp3911_read(adc, MCP3911_REG_GAIN, ®val, 1);
605 for (int i = 0; i < adc->chip->num_channels - 1; i++) {
607 regval &= ~MCP3911_GAIN_MASK(i);
610 return mcp3911_write(adc, MCP3911_REG_GAIN, regval, 1);
613 static int mcp3910_config(struct mcp3911 *adc)
615 struct device *dev = &adc->spi->dev;
619 ret = mcp3911_read(adc, MCP3910_REG_CONFIG1, ®val, 3);
623 regval &= ~MCP3910_CONFIG1_VREFEXT;
625 dev_dbg(dev, "use external voltage reference\n");
626 regval |= FIELD_PREP(MCP3910_CONFIG1_VREFEXT, 1);
628 dev_dbg(dev, "use internal voltage reference (1.2V)\n");
629 regval |= FIELD_PREP(MCP3910_CONFIG1_VREFEXT, 0);
632 regval &= ~MCP3910_CONFIG1_CLKEXT;
634 dev_dbg(dev, "use external clock as clocksource\n");
635 regval |= FIELD_PREP(MCP3910_CONFIG1_CLKEXT, 1);
637 dev_dbg(dev, "use crystal oscillator as clocksource\n");
638 regval |= FIELD_PREP(MCP3910_CONFIG1_CLKEXT, 0);
641 ret = mcp3911_write(adc, MCP3910_REG_CONFIG1, regval, 3);
645 ret = mcp3911_read(adc, MCP3910_REG_STATUSCOM, ®val, 3);
649 /* Address counter incremented, cycle through register types */
650 regval &= ~MCP3910_STATUSCOM_READ;
651 regval |= FIELD_PREP(MCP3910_STATUSCOM_READ, 0x02);
653 regval &= ~MCP3910_STATUSCOM_DRHIZ;
654 if (device_property_read_bool(dev, "microchip,data-ready-hiz"))
655 regval |= FIELD_PREP(MCP3910_STATUSCOM_DRHIZ, 0);
657 regval |= FIELD_PREP(MCP3910_STATUSCOM_DRHIZ, 1);
659 ret = mcp3911_write(adc, MCP3910_REG_STATUSCOM, regval, 3);
663 /* Set gain to 1 for all channels */
664 ret = mcp3911_read(adc, MCP3910_REG_GAIN, ®val, 3);
668 for (int i = 0; i < adc->chip->num_channels - 1; i++) {
670 regval &= ~MCP3911_GAIN_MASK(i);
672 ret = mcp3911_write(adc, MCP3910_REG_GAIN, regval, 3);
676 /* Disable offset to ignore any old values in offset register */
677 return adc->chip->enable_offset(adc, 0);
680 static void mcp3911_cleanup_regulator(void *vref)
682 regulator_disable(vref);
685 static int mcp3911_set_trigger_state(struct iio_trigger *trig, bool enable)
687 struct mcp3911 *adc = iio_trigger_get_drvdata(trig);
690 enable_irq(adc->spi->irq);
692 disable_irq(adc->spi->irq);
697 static const struct iio_trigger_ops mcp3911_trigger_ops = {
698 .validate_device = iio_trigger_validate_own_device,
699 .set_trigger_state = mcp3911_set_trigger_state,
702 static int mcp3911_probe(struct spi_device *spi)
704 struct device *dev = &spi->dev;
705 struct iio_dev *indio_dev;
709 indio_dev = devm_iio_device_alloc(dev, sizeof(*adc));
713 adc = iio_priv(indio_dev);
715 adc->chip = spi_get_device_match_data(spi);
717 adc->vref = devm_regulator_get_optional(dev, "vref");
718 if (IS_ERR(adc->vref)) {
719 if (PTR_ERR(adc->vref) == -ENODEV) {
722 return dev_err_probe(dev, PTR_ERR(adc->vref), "failed to get regulator\n");
726 ret = regulator_enable(adc->vref);
730 ret = devm_add_action_or_reset(dev, mcp3911_cleanup_regulator, adc->vref);
735 adc->clki = devm_clk_get_enabled(dev, NULL);
736 if (IS_ERR(adc->clki)) {
737 if (PTR_ERR(adc->clki) == -ENOENT) {
740 return dev_err_probe(dev, PTR_ERR(adc->clki), "failed to get adc clk\n");
745 * Fallback to "device-addr" due to historical mismatch between
746 * dt-bindings and implementation.
748 ret = device_property_read_u32(dev, "microchip,device-addr", &adc->dev_addr);
750 device_property_read_u32(dev, "device-addr", &adc->dev_addr);
751 if (adc->dev_addr > 3) {
752 return dev_err_probe(dev, -EINVAL,
753 "invalid device address (%i). Must be in range 0-3.\n",
756 dev_dbg(dev, "use device address %i\n", adc->dev_addr);
758 ret = adc->chip->config(adc);
762 ret = mcp3911_calc_scale_table(adc);
766 /* Set gain to 1 for all channels */
767 for (int i = 0; i < adc->chip->num_channels - 1; i++) {
769 ret = mcp3911_update(adc, MCP3911_REG_GAIN,
770 MCP3911_GAIN_MASK(i),
771 MCP3911_GAIN_VAL(i, 0), 1);
776 indio_dev->name = spi_get_device_id(spi)->name;
777 indio_dev->modes = INDIO_DIRECT_MODE;
778 indio_dev->info = &mcp3911_info;
779 spi_set_drvdata(spi, indio_dev);
781 indio_dev->channels = adc->chip->channels;
782 indio_dev->num_channels = adc->chip->num_channels;
784 mutex_init(&adc->lock);
787 adc->trig = devm_iio_trigger_alloc(dev, "%s-dev%d", indio_dev->name,
788 iio_device_id(indio_dev));
792 adc->trig->ops = &mcp3911_trigger_ops;
793 iio_trigger_set_drvdata(adc->trig, adc);
794 ret = devm_iio_trigger_register(dev, adc->trig);
799 * The device generates interrupts as long as it is powered up.
800 * Some platforms might not allow the option to power it down so
801 * don't enable the interrupt to avoid extra load on the system.
803 ret = devm_request_irq(dev, spi->irq, &iio_trigger_generic_data_rdy_poll,
804 IRQF_NO_AUTOEN | IRQF_ONESHOT,
805 indio_dev->name, adc->trig);
810 ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL,
811 mcp3911_trigger_handler, NULL);
815 return devm_iio_device_register(dev, indio_dev);
818 static const struct mcp3911_chip_info mcp3911_chip_info[] = {
820 .channels = mcp3910_channels,
821 .num_channels = ARRAY_SIZE(mcp3910_channels),
822 .config = mcp3910_config,
823 .get_osr = mcp3910_get_osr,
824 .set_osr = mcp3910_set_osr,
825 .enable_offset = mcp3910_enable_offset,
826 .get_offset = mcp3910_get_offset,
827 .set_offset = mcp3910_set_offset,
828 .set_scale = mcp3910_set_scale,
831 .channels = mcp3911_channels,
832 .num_channels = ARRAY_SIZE(mcp3911_channels),
833 .config = mcp3911_config,
834 .get_osr = mcp3911_get_osr,
835 .set_osr = mcp3911_set_osr,
836 .enable_offset = mcp3911_enable_offset,
837 .get_offset = mcp3911_get_offset,
838 .set_offset = mcp3911_set_offset,
839 .set_scale = mcp3911_set_scale,
842 .channels = mcp3912_channels,
843 .num_channels = ARRAY_SIZE(mcp3912_channels),
844 .config = mcp3910_config,
845 .get_osr = mcp3910_get_osr,
846 .set_osr = mcp3910_set_osr,
847 .enable_offset = mcp3910_enable_offset,
848 .get_offset = mcp3910_get_offset,
849 .set_offset = mcp3910_set_offset,
850 .set_scale = mcp3910_set_scale,
853 .channels = mcp3913_channels,
854 .num_channels = ARRAY_SIZE(mcp3913_channels),
855 .config = mcp3910_config,
856 .get_osr = mcp3910_get_osr,
857 .set_osr = mcp3910_set_osr,
858 .enable_offset = mcp3910_enable_offset,
859 .get_offset = mcp3910_get_offset,
860 .set_offset = mcp3910_set_offset,
861 .set_scale = mcp3910_set_scale,
864 .channels = mcp3914_channels,
865 .num_channels = ARRAY_SIZE(mcp3914_channels),
866 .config = mcp3910_config,
867 .get_osr = mcp3910_get_osr,
868 .set_osr = mcp3910_set_osr,
869 .enable_offset = mcp3910_enable_offset,
870 .get_offset = mcp3910_get_offset,
871 .set_offset = mcp3910_set_offset,
872 .set_scale = mcp3910_set_scale,
875 .channels = mcp3918_channels,
876 .num_channels = ARRAY_SIZE(mcp3918_channels),
877 .config = mcp3910_config,
878 .get_osr = mcp3910_get_osr,
879 .set_osr = mcp3910_set_osr,
880 .enable_offset = mcp3910_enable_offset,
881 .get_offset = mcp3910_get_offset,
882 .set_offset = mcp3910_set_offset,
883 .set_scale = mcp3910_set_scale,
886 .channels = mcp3919_channels,
887 .num_channels = ARRAY_SIZE(mcp3919_channels),
888 .config = mcp3910_config,
889 .get_osr = mcp3910_get_osr,
890 .set_osr = mcp3910_set_osr,
891 .enable_offset = mcp3910_enable_offset,
892 .get_offset = mcp3910_get_offset,
893 .set_offset = mcp3910_set_offset,
894 .set_scale = mcp3910_set_scale,
897 static const struct of_device_id mcp3911_dt_ids[] = {
898 { .compatible = "microchip,mcp3910", .data = &mcp3911_chip_info[MCP3910] },
899 { .compatible = "microchip,mcp3911", .data = &mcp3911_chip_info[MCP3911] },
900 { .compatible = "microchip,mcp3912", .data = &mcp3911_chip_info[MCP3912] },
901 { .compatible = "microchip,mcp3913", .data = &mcp3911_chip_info[MCP3913] },
902 { .compatible = "microchip,mcp3914", .data = &mcp3911_chip_info[MCP3914] },
903 { .compatible = "microchip,mcp3918", .data = &mcp3911_chip_info[MCP3918] },
904 { .compatible = "microchip,mcp3919", .data = &mcp3911_chip_info[MCP3919] },
907 MODULE_DEVICE_TABLE(of, mcp3911_dt_ids);
909 static const struct spi_device_id mcp3911_id[] = {
910 { "mcp3910", (kernel_ulong_t)&mcp3911_chip_info[MCP3910] },
911 { "mcp3911", (kernel_ulong_t)&mcp3911_chip_info[MCP3911] },
912 { "mcp3912", (kernel_ulong_t)&mcp3911_chip_info[MCP3912] },
913 { "mcp3913", (kernel_ulong_t)&mcp3911_chip_info[MCP3913] },
914 { "mcp3914", (kernel_ulong_t)&mcp3911_chip_info[MCP3914] },
915 { "mcp3918", (kernel_ulong_t)&mcp3911_chip_info[MCP3918] },
916 { "mcp3919", (kernel_ulong_t)&mcp3911_chip_info[MCP3919] },
919 MODULE_DEVICE_TABLE(spi, mcp3911_id);
921 static struct spi_driver mcp3911_driver = {
924 .of_match_table = mcp3911_dt_ids,
926 .probe = mcp3911_probe,
927 .id_table = mcp3911_id,
929 module_spi_driver(mcp3911_driver);
931 MODULE_AUTHOR("Marcus Folkesson <marcus.folkesson@gmail.com>");
932 MODULE_AUTHOR("Kent Gustavsson <kent@minoris.se>");
933 MODULE_DESCRIPTION("Microchip Technology MCP3911");
934 MODULE_LICENSE("GPL v2");