1 // SPDX-License-Identifier: GPL-2.0
3 * AD7190 AD7192 AD7193 AD7195 SPI ADC driver
5 * Copyright 2011-2015 Analog Devices Inc.
8 #include <linux/interrupt.h>
10 #include <linux/device.h>
11 #include <linux/kernel.h>
12 #include <linux/slab.h>
13 #include <linux/sysfs.h>
14 #include <linux/spi/spi.h>
15 #include <linux/regulator/consumer.h>
16 #include <linux/err.h>
17 #include <linux/sched.h>
18 #include <linux/delay.h>
19 #include <linux/of_device.h>
21 #include <linux/iio/iio.h>
22 #include <linux/iio/sysfs.h>
23 #include <linux/iio/buffer.h>
24 #include <linux/iio/trigger.h>
25 #include <linux/iio/trigger_consumer.h>
26 #include <linux/iio/triggered_buffer.h>
27 #include <linux/iio/adc/ad_sigma_delta.h>
30 #define AD7192_REG_COMM 0 /* Communications Register (WO, 8-bit) */
31 #define AD7192_REG_STAT 0 /* Status Register (RO, 8-bit) */
32 #define AD7192_REG_MODE 1 /* Mode Register (RW, 24-bit */
33 #define AD7192_REG_CONF 2 /* Configuration Register (RW, 24-bit) */
34 #define AD7192_REG_DATA 3 /* Data Register (RO, 24/32-bit) */
35 #define AD7192_REG_ID 4 /* ID Register (RO, 8-bit) */
36 #define AD7192_REG_GPOCON 5 /* GPOCON Register (RO, 8-bit) */
37 #define AD7192_REG_OFFSET 6 /* Offset Register (RW, 16-bit */
38 /* (AD7792)/24-bit (AD7192)) */
39 #define AD7192_REG_FULLSALE 7 /* Full-Scale Register */
40 /* (RW, 16-bit (AD7792)/24-bit (AD7192)) */
42 /* Communications Register Bit Designations (AD7192_REG_COMM) */
43 #define AD7192_COMM_WEN BIT(7) /* Write Enable */
44 #define AD7192_COMM_WRITE 0 /* Write Operation */
45 #define AD7192_COMM_READ BIT(6) /* Read Operation */
46 #define AD7192_COMM_ADDR(x) (((x) & 0x7) << 3) /* Register Address */
47 #define AD7192_COMM_CREAD BIT(2) /* Continuous Read of Data Register */
49 /* Status Register Bit Designations (AD7192_REG_STAT) */
50 #define AD7192_STAT_RDY BIT(7) /* Ready */
51 #define AD7192_STAT_ERR BIT(6) /* Error (Overrange, Underrange) */
52 #define AD7192_STAT_NOREF BIT(5) /* Error no external reference */
53 #define AD7192_STAT_PARITY BIT(4) /* Parity */
54 #define AD7192_STAT_CH3 BIT(2) /* Channel 3 */
55 #define AD7192_STAT_CH2 BIT(1) /* Channel 2 */
56 #define AD7192_STAT_CH1 BIT(0) /* Channel 1 */
58 /* Mode Register Bit Designations (AD7192_REG_MODE) */
59 #define AD7192_MODE_SEL(x) (((x) & 0x7) << 21) /* Operation Mode Select */
60 #define AD7192_MODE_SEL_MASK (0x7 << 21) /* Operation Mode Select Mask */
61 #define AD7192_MODE_STA(x) (((x) & 0x1) << 20) /* Status Register transmission */
62 #define AD7192_MODE_STA_MASK BIT(20) /* Status Register transmission Mask */
63 #define AD7192_MODE_CLKSRC(x) (((x) & 0x3) << 18) /* Clock Source Select */
64 #define AD7192_MODE_SINC3 BIT(15) /* SINC3 Filter Select */
65 #define AD7192_MODE_ACX BIT(14) /* AC excitation enable(AD7195 only)*/
66 #define AD7192_MODE_ENPAR BIT(13) /* Parity Enable */
67 #define AD7192_MODE_CLKDIV BIT(12) /* Clock divide by 2 (AD7190/2 only)*/
68 #define AD7192_MODE_SCYCLE BIT(11) /* Single cycle conversion */
69 #define AD7192_MODE_REJ60 BIT(10) /* 50/60Hz notch filter */
70 #define AD7192_MODE_RATE(x) ((x) & 0x3FF) /* Filter Update Rate Select */
72 /* Mode Register: AD7192_MODE_SEL options */
73 #define AD7192_MODE_CONT 0 /* Continuous Conversion Mode */
74 #define AD7192_MODE_SINGLE 1 /* Single Conversion Mode */
75 #define AD7192_MODE_IDLE 2 /* Idle Mode */
76 #define AD7192_MODE_PWRDN 3 /* Power-Down Mode */
77 #define AD7192_MODE_CAL_INT_ZERO 4 /* Internal Zero-Scale Calibration */
78 #define AD7192_MODE_CAL_INT_FULL 5 /* Internal Full-Scale Calibration */
79 #define AD7192_MODE_CAL_SYS_ZERO 6 /* System Zero-Scale Calibration */
80 #define AD7192_MODE_CAL_SYS_FULL 7 /* System Full-Scale Calibration */
82 /* Mode Register: AD7192_MODE_CLKSRC options */
83 #define AD7192_CLK_EXT_MCLK1_2 0 /* External 4.92 MHz Clock connected*/
84 /* from MCLK1 to MCLK2 */
85 #define AD7192_CLK_EXT_MCLK2 1 /* External Clock applied to MCLK2 */
86 #define AD7192_CLK_INT 2 /* Internal 4.92 MHz Clock not */
87 /* available at the MCLK2 pin */
88 #define AD7192_CLK_INT_CO 3 /* Internal 4.92 MHz Clock available*/
89 /* at the MCLK2 pin */
91 /* Configuration Register Bit Designations (AD7192_REG_CONF) */
93 #define AD7192_CONF_CHOP BIT(23) /* CHOP enable */
94 #define AD7192_CONF_REFSEL BIT(20) /* REFIN1/REFIN2 Reference Select */
95 #define AD7192_CONF_CHAN(x) ((x) << 8) /* Channel select */
96 #define AD7192_CONF_CHAN_MASK (0x7FF << 8) /* Channel select mask */
97 #define AD7192_CONF_BURN BIT(7) /* Burnout current enable */
98 #define AD7192_CONF_REFDET BIT(6) /* Reference detect enable */
99 #define AD7192_CONF_BUF BIT(4) /* Buffered Mode Enable */
100 #define AD7192_CONF_UNIPOLAR BIT(3) /* Unipolar/Bipolar Enable */
101 #define AD7192_CONF_GAIN(x) ((x) & 0x7) /* Gain Select */
103 #define AD7192_CH_AIN1P_AIN2M BIT(0) /* AIN1(+) - AIN2(-) */
104 #define AD7192_CH_AIN3P_AIN4M BIT(1) /* AIN3(+) - AIN4(-) */
105 #define AD7192_CH_TEMP BIT(2) /* Temp Sensor */
106 #define AD7192_CH_AIN2P_AIN2M BIT(3) /* AIN2(+) - AIN2(-) */
107 #define AD7192_CH_AIN1 BIT(4) /* AIN1 - AINCOM */
108 #define AD7192_CH_AIN2 BIT(5) /* AIN2 - AINCOM */
109 #define AD7192_CH_AIN3 BIT(6) /* AIN3 - AINCOM */
110 #define AD7192_CH_AIN4 BIT(7) /* AIN4 - AINCOM */
112 #define AD7193_CH_AIN1P_AIN2M 0x001 /* AIN1(+) - AIN2(-) */
113 #define AD7193_CH_AIN3P_AIN4M 0x002 /* AIN3(+) - AIN4(-) */
114 #define AD7193_CH_AIN5P_AIN6M 0x004 /* AIN5(+) - AIN6(-) */
115 #define AD7193_CH_AIN7P_AIN8M 0x008 /* AIN7(+) - AIN8(-) */
116 #define AD7193_CH_TEMP 0x100 /* Temp senseor */
117 #define AD7193_CH_AIN2P_AIN2M 0x200 /* AIN2(+) - AIN2(-) */
118 #define AD7193_CH_AIN1 0x401 /* AIN1 - AINCOM */
119 #define AD7193_CH_AIN2 0x402 /* AIN2 - AINCOM */
120 #define AD7193_CH_AIN3 0x404 /* AIN3 - AINCOM */
121 #define AD7193_CH_AIN4 0x408 /* AIN4 - AINCOM */
122 #define AD7193_CH_AIN5 0x410 /* AIN5 - AINCOM */
123 #define AD7193_CH_AIN6 0x420 /* AIN6 - AINCOM */
124 #define AD7193_CH_AIN7 0x440 /* AIN7 - AINCOM */
125 #define AD7193_CH_AIN8 0x480 /* AIN7 - AINCOM */
126 #define AD7193_CH_AINCOM 0x600 /* AINCOM - AINCOM */
128 /* ID Register Bit Designations (AD7192_REG_ID) */
129 #define CHIPID_AD7190 0x4
130 #define CHIPID_AD7192 0x0
131 #define CHIPID_AD7193 0x2
132 #define CHIPID_AD7195 0x6
133 #define AD7192_ID_MASK 0x0F
135 /* GPOCON Register Bit Designations (AD7192_REG_GPOCON) */
136 #define AD7192_GPOCON_BPDSW BIT(6) /* Bridge power-down switch enable */
137 #define AD7192_GPOCON_GP32EN BIT(5) /* Digital Output P3 and P2 enable */
138 #define AD7192_GPOCON_GP10EN BIT(4) /* Digital Output P1 and P0 enable */
139 #define AD7192_GPOCON_P3DAT BIT(3) /* P3 state */
140 #define AD7192_GPOCON_P2DAT BIT(2) /* P2 state */
141 #define AD7192_GPOCON_P1DAT BIT(1) /* P1 state */
142 #define AD7192_GPOCON_P0DAT BIT(0) /* P0 state */
144 #define AD7192_EXT_FREQ_MHZ_MIN 2457600
145 #define AD7192_EXT_FREQ_MHZ_MAX 5120000
146 #define AD7192_INT_FREQ_MHZ 4915200
148 #define AD7192_NO_SYNC_FILTER 1
149 #define AD7192_SYNC3_FILTER 3
150 #define AD7192_SYNC4_FILTER 4
153 * The AD7190/2/5 features a dual use data out ready DOUT/RDY output.
154 * In order to avoid contentions on the SPI bus, it's therefore necessary
155 * to use spi bus locking.
157 * The DOUT/RDY output must also be wired to an interrupt capable GPIO.
161 AD7192_SYSCALIB_ZERO_SCALE,
162 AD7192_SYSCALIB_FULL_SCALE,
172 struct ad7192_chip_info {
173 unsigned int chip_id;
177 struct ad7192_state {
178 const struct ad7192_chip_info *chip_info;
179 struct regulator *avdd;
180 struct regulator *dvdd;
187 u32 scale_avail[8][2];
190 struct mutex lock; /* protect sensor state */
193 struct ad_sigma_delta sd;
196 static const char * const ad7192_syscalib_modes[] = {
197 [AD7192_SYSCALIB_ZERO_SCALE] = "zero_scale",
198 [AD7192_SYSCALIB_FULL_SCALE] = "full_scale",
201 static int ad7192_set_syscalib_mode(struct iio_dev *indio_dev,
202 const struct iio_chan_spec *chan,
205 struct ad7192_state *st = iio_priv(indio_dev);
207 st->syscalib_mode[chan->channel] = mode;
212 static int ad7192_get_syscalib_mode(struct iio_dev *indio_dev,
213 const struct iio_chan_spec *chan)
215 struct ad7192_state *st = iio_priv(indio_dev);
217 return st->syscalib_mode[chan->channel];
220 static ssize_t ad7192_write_syscalib(struct iio_dev *indio_dev,
222 const struct iio_chan_spec *chan,
223 const char *buf, size_t len)
225 struct ad7192_state *st = iio_priv(indio_dev);
229 ret = kstrtobool(buf, &sys_calib);
233 temp = st->syscalib_mode[chan->channel];
235 if (temp == AD7192_SYSCALIB_ZERO_SCALE)
236 ret = ad_sd_calibrate(&st->sd, AD7192_MODE_CAL_SYS_ZERO,
239 ret = ad_sd_calibrate(&st->sd, AD7192_MODE_CAL_SYS_FULL,
243 return ret ? ret : len;
246 static const struct iio_enum ad7192_syscalib_mode_enum = {
247 .items = ad7192_syscalib_modes,
248 .num_items = ARRAY_SIZE(ad7192_syscalib_modes),
249 .set = ad7192_set_syscalib_mode,
250 .get = ad7192_get_syscalib_mode
253 static const struct iio_chan_spec_ext_info ad7192_calibsys_ext_info[] = {
255 .name = "sys_calibration",
256 .write = ad7192_write_syscalib,
257 .shared = IIO_SEPARATE,
259 IIO_ENUM("sys_calibration_mode", IIO_SEPARATE,
260 &ad7192_syscalib_mode_enum),
261 IIO_ENUM_AVAILABLE("sys_calibration_mode", IIO_SHARED_BY_TYPE,
262 &ad7192_syscalib_mode_enum),
266 static struct ad7192_state *ad_sigma_delta_to_ad7192(struct ad_sigma_delta *sd)
268 return container_of(sd, struct ad7192_state, sd);
271 static int ad7192_set_channel(struct ad_sigma_delta *sd, unsigned int channel)
273 struct ad7192_state *st = ad_sigma_delta_to_ad7192(sd);
275 st->conf &= ~AD7192_CONF_CHAN_MASK;
276 st->conf |= AD7192_CONF_CHAN(channel);
278 return ad_sd_write_reg(&st->sd, AD7192_REG_CONF, 3, st->conf);
281 static int ad7192_set_mode(struct ad_sigma_delta *sd,
282 enum ad_sigma_delta_mode mode)
284 struct ad7192_state *st = ad_sigma_delta_to_ad7192(sd);
286 st->mode &= ~AD7192_MODE_SEL_MASK;
287 st->mode |= AD7192_MODE_SEL(mode);
289 return ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode);
292 static int ad7192_append_status(struct ad_sigma_delta *sd, bool append)
294 struct ad7192_state *st = ad_sigma_delta_to_ad7192(sd);
295 unsigned int mode = st->mode;
298 mode &= ~AD7192_MODE_STA_MASK;
299 mode |= AD7192_MODE_STA(append);
301 ret = ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, mode);
310 static int ad7192_disable_all(struct ad_sigma_delta *sd)
312 struct ad7192_state *st = ad_sigma_delta_to_ad7192(sd);
316 conf &= ~AD7192_CONF_CHAN_MASK;
318 ret = ad_sd_write_reg(&st->sd, AD7192_REG_CONF, 3, conf);
327 static const struct ad_sigma_delta_info ad7192_sigma_delta_info = {
328 .set_channel = ad7192_set_channel,
329 .append_status = ad7192_append_status,
330 .disable_all = ad7192_disable_all,
331 .set_mode = ad7192_set_mode,
332 .has_registers = true,
335 .status_ch_mask = GENMASK(3, 0),
337 .irq_flags = IRQF_TRIGGER_FALLING,
340 static const struct ad_sd_calib_data ad7192_calib_arr[8] = {
341 {AD7192_MODE_CAL_INT_ZERO, AD7192_CH_AIN1},
342 {AD7192_MODE_CAL_INT_FULL, AD7192_CH_AIN1},
343 {AD7192_MODE_CAL_INT_ZERO, AD7192_CH_AIN2},
344 {AD7192_MODE_CAL_INT_FULL, AD7192_CH_AIN2},
345 {AD7192_MODE_CAL_INT_ZERO, AD7192_CH_AIN3},
346 {AD7192_MODE_CAL_INT_FULL, AD7192_CH_AIN3},
347 {AD7192_MODE_CAL_INT_ZERO, AD7192_CH_AIN4},
348 {AD7192_MODE_CAL_INT_FULL, AD7192_CH_AIN4}
351 static int ad7192_calibrate_all(struct ad7192_state *st)
353 return ad_sd_calibrate_all(&st->sd, ad7192_calib_arr,
354 ARRAY_SIZE(ad7192_calib_arr));
357 static inline bool ad7192_valid_external_frequency(u32 freq)
359 return (freq >= AD7192_EXT_FREQ_MHZ_MIN &&
360 freq <= AD7192_EXT_FREQ_MHZ_MAX);
363 static int ad7192_of_clock_select(struct ad7192_state *st)
365 struct device_node *np = st->sd.spi->dev.of_node;
366 unsigned int clock_sel;
368 clock_sel = AD7192_CLK_INT;
370 /* use internal clock */
372 if (of_property_read_bool(np, "adi,int-clock-output-enable"))
373 clock_sel = AD7192_CLK_INT_CO;
375 if (of_property_read_bool(np, "adi,clock-xtal"))
376 clock_sel = AD7192_CLK_EXT_MCLK1_2;
378 clock_sel = AD7192_CLK_EXT_MCLK2;
384 static int ad7192_setup(struct ad7192_state *st, struct device_node *np)
386 struct iio_dev *indio_dev = spi_get_drvdata(st->sd.spi);
387 bool rej60_en, refin2_en;
388 bool buf_en, bipolar, burnout_curr_en;
389 unsigned long long scale_uv;
392 /* reset the serial interface */
393 ret = ad_sd_reset(&st->sd, 48);
396 usleep_range(500, 1000); /* Wait for at least 500us */
398 /* write/read test for device presence */
399 ret = ad_sd_read_reg(&st->sd, AD7192_REG_ID, 1, &id);
403 id &= AD7192_ID_MASK;
405 if (id != st->chip_info->chip_id)
406 dev_warn(&st->sd.spi->dev, "device ID query failed (0x%X)\n",
409 st->mode = AD7192_MODE_SEL(AD7192_MODE_IDLE) |
410 AD7192_MODE_CLKSRC(st->clock_sel) |
411 AD7192_MODE_RATE(480);
413 st->conf = AD7192_CONF_GAIN(0);
415 rej60_en = of_property_read_bool(np, "adi,rejection-60-Hz-enable");
417 st->mode |= AD7192_MODE_REJ60;
419 refin2_en = of_property_read_bool(np, "adi,refin2-pins-enable");
420 if (refin2_en && st->chip_info->chip_id != CHIPID_AD7195)
421 st->conf |= AD7192_CONF_REFSEL;
423 st->conf &= ~AD7192_CONF_CHOP;
424 st->f_order = AD7192_NO_SYNC_FILTER;
426 buf_en = of_property_read_bool(np, "adi,buffer-enable");
428 st->conf |= AD7192_CONF_BUF;
430 bipolar = of_property_read_bool(np, "bipolar");
432 st->conf |= AD7192_CONF_UNIPOLAR;
434 burnout_curr_en = of_property_read_bool(np,
435 "adi,burnout-currents-enable");
436 if (burnout_curr_en && buf_en) {
437 st->conf |= AD7192_CONF_BURN;
438 } else if (burnout_curr_en) {
439 dev_warn(&st->sd.spi->dev,
440 "Can't enable burnout currents: see CHOP or buffer\n");
443 ret = ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode);
447 ret = ad_sd_write_reg(&st->sd, AD7192_REG_CONF, 3, st->conf);
451 ret = ad7192_calibrate_all(st);
455 /* Populate available ADC input ranges */
456 for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++) {
457 scale_uv = ((u64)st->int_vref_mv * 100000000)
458 >> (indio_dev->channels[0].scan_type.realbits -
459 ((st->conf & AD7192_CONF_UNIPOLAR) ? 0 : 1));
462 st->scale_avail[i][1] = do_div(scale_uv, 100000000) * 10;
463 st->scale_avail[i][0] = scale_uv;
469 static ssize_t ad7192_show_ac_excitation(struct device *dev,
470 struct device_attribute *attr,
473 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
474 struct ad7192_state *st = iio_priv(indio_dev);
476 return sysfs_emit(buf, "%d\n", !!(st->mode & AD7192_MODE_ACX));
479 static ssize_t ad7192_show_bridge_switch(struct device *dev,
480 struct device_attribute *attr,
483 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
484 struct ad7192_state *st = iio_priv(indio_dev);
486 return sysfs_emit(buf, "%d\n", !!(st->gpocon & AD7192_GPOCON_BPDSW));
489 static ssize_t ad7192_set(struct device *dev,
490 struct device_attribute *attr,
494 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
495 struct ad7192_state *st = iio_priv(indio_dev);
496 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
500 ret = kstrtobool(buf, &val);
504 ret = iio_device_claim_direct_mode(indio_dev);
508 switch ((u32)this_attr->address) {
509 case AD7192_REG_GPOCON:
511 st->gpocon |= AD7192_GPOCON_BPDSW;
513 st->gpocon &= ~AD7192_GPOCON_BPDSW;
515 ad_sd_write_reg(&st->sd, AD7192_REG_GPOCON, 1, st->gpocon);
517 case AD7192_REG_MODE:
519 st->mode |= AD7192_MODE_ACX;
521 st->mode &= ~AD7192_MODE_ACX;
523 ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode);
529 iio_device_release_direct_mode(indio_dev);
531 return ret ? ret : len;
534 static void ad7192_get_available_filter_freq(struct ad7192_state *st,
539 /* Formulas for filter at page 25 of the datasheet */
540 fadc = DIV_ROUND_CLOSEST(st->fclk,
541 AD7192_SYNC4_FILTER * AD7192_MODE_RATE(st->mode));
542 freq[0] = DIV_ROUND_CLOSEST(fadc * 240, 1024);
544 fadc = DIV_ROUND_CLOSEST(st->fclk,
545 AD7192_SYNC3_FILTER * AD7192_MODE_RATE(st->mode));
546 freq[1] = DIV_ROUND_CLOSEST(fadc * 240, 1024);
548 fadc = DIV_ROUND_CLOSEST(st->fclk, AD7192_MODE_RATE(st->mode));
549 freq[2] = DIV_ROUND_CLOSEST(fadc * 230, 1024);
550 freq[3] = DIV_ROUND_CLOSEST(fadc * 272, 1024);
553 static ssize_t ad7192_show_filter_avail(struct device *dev,
554 struct device_attribute *attr,
557 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
558 struct ad7192_state *st = iio_priv(indio_dev);
559 unsigned int freq_avail[4], i;
562 ad7192_get_available_filter_freq(st, freq_avail);
564 for (i = 0; i < ARRAY_SIZE(freq_avail); i++)
565 len += scnprintf(buf + len, PAGE_SIZE - len,
566 "%d.%d ", freq_avail[i] / 1000,
567 freq_avail[i] % 1000);
574 static IIO_DEVICE_ATTR(filter_low_pass_3db_frequency_available,
575 0444, ad7192_show_filter_avail, NULL, 0);
577 static IIO_DEVICE_ATTR(bridge_switch_en, 0644,
578 ad7192_show_bridge_switch, ad7192_set,
581 static IIO_DEVICE_ATTR(ac_excitation_en, 0644,
582 ad7192_show_ac_excitation, ad7192_set,
585 static struct attribute *ad7192_attributes[] = {
586 &iio_dev_attr_filter_low_pass_3db_frequency_available.dev_attr.attr,
587 &iio_dev_attr_bridge_switch_en.dev_attr.attr,
588 &iio_dev_attr_ac_excitation_en.dev_attr.attr,
592 static const struct attribute_group ad7192_attribute_group = {
593 .attrs = ad7192_attributes,
596 static struct attribute *ad7195_attributes[] = {
597 &iio_dev_attr_filter_low_pass_3db_frequency_available.dev_attr.attr,
598 &iio_dev_attr_bridge_switch_en.dev_attr.attr,
602 static const struct attribute_group ad7195_attribute_group = {
603 .attrs = ad7195_attributes,
606 static unsigned int ad7192_get_temp_scale(bool unipolar)
608 return unipolar ? 2815 * 2 : 2815;
611 static int ad7192_set_3db_filter_freq(struct ad7192_state *st,
614 int freq_avail[4], i, ret, freq;
615 unsigned int diff_new, diff_old;
619 freq = val * 1000 + val2;
621 ad7192_get_available_filter_freq(st, freq_avail);
623 for (i = 0; i < ARRAY_SIZE(freq_avail); i++) {
624 diff_new = abs(freq - freq_avail[i]);
625 if (diff_new < diff_old) {
633 st->f_order = AD7192_SYNC4_FILTER;
634 st->mode &= ~AD7192_MODE_SINC3;
636 st->conf |= AD7192_CONF_CHOP;
639 st->f_order = AD7192_SYNC3_FILTER;
640 st->mode |= AD7192_MODE_SINC3;
642 st->conf |= AD7192_CONF_CHOP;
645 st->f_order = AD7192_NO_SYNC_FILTER;
646 st->mode &= ~AD7192_MODE_SINC3;
648 st->conf &= ~AD7192_CONF_CHOP;
651 st->f_order = AD7192_NO_SYNC_FILTER;
652 st->mode |= AD7192_MODE_SINC3;
654 st->conf &= ~AD7192_CONF_CHOP;
658 ret = ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode);
662 return ad_sd_write_reg(&st->sd, AD7192_REG_CONF, 3, st->conf);
665 static int ad7192_get_3db_filter_freq(struct ad7192_state *st)
669 fadc = DIV_ROUND_CLOSEST(st->fclk,
670 st->f_order * AD7192_MODE_RATE(st->mode));
672 if (st->conf & AD7192_CONF_CHOP)
673 return DIV_ROUND_CLOSEST(fadc * 240, 1024);
674 if (st->mode & AD7192_MODE_SINC3)
675 return DIV_ROUND_CLOSEST(fadc * 272, 1024);
677 return DIV_ROUND_CLOSEST(fadc * 230, 1024);
680 static int ad7192_read_raw(struct iio_dev *indio_dev,
681 struct iio_chan_spec const *chan,
686 struct ad7192_state *st = iio_priv(indio_dev);
687 bool unipolar = !!(st->conf & AD7192_CONF_UNIPOLAR);
690 case IIO_CHAN_INFO_RAW:
691 return ad_sigma_delta_single_conversion(indio_dev, chan, val);
692 case IIO_CHAN_INFO_SCALE:
693 switch (chan->type) {
695 mutex_lock(&st->lock);
696 *val = st->scale_avail[AD7192_CONF_GAIN(st->conf)][0];
697 *val2 = st->scale_avail[AD7192_CONF_GAIN(st->conf)][1];
698 mutex_unlock(&st->lock);
699 return IIO_VAL_INT_PLUS_NANO;
702 *val2 = 1000000000 / ad7192_get_temp_scale(unipolar);
703 return IIO_VAL_INT_PLUS_NANO;
707 case IIO_CHAN_INFO_OFFSET:
709 *val = -(1 << (chan->scan_type.realbits - 1));
712 /* Kelvin to Celsius */
713 if (chan->type == IIO_TEMP)
714 *val -= 273 * ad7192_get_temp_scale(unipolar);
716 case IIO_CHAN_INFO_SAMP_FREQ:
718 (st->f_order * 1024 * AD7192_MODE_RATE(st->mode));
720 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
721 *val = ad7192_get_3db_filter_freq(st);
723 return IIO_VAL_FRACTIONAL;
729 static int ad7192_write_raw(struct iio_dev *indio_dev,
730 struct iio_chan_spec const *chan,
735 struct ad7192_state *st = iio_priv(indio_dev);
739 ret = iio_device_claim_direct_mode(indio_dev);
744 case IIO_CHAN_INFO_SCALE:
746 mutex_lock(&st->lock);
747 for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++)
748 if (val2 == st->scale_avail[i][1]) {
751 st->conf &= ~AD7192_CONF_GAIN(-1);
752 st->conf |= AD7192_CONF_GAIN(i);
755 ad_sd_write_reg(&st->sd, AD7192_REG_CONF,
757 ad7192_calibrate_all(st);
760 mutex_unlock(&st->lock);
762 case IIO_CHAN_INFO_SAMP_FREQ:
768 div = st->fclk / (val * st->f_order * 1024);
769 if (div < 1 || div > 1023) {
774 st->mode &= ~AD7192_MODE_RATE(-1);
775 st->mode |= AD7192_MODE_RATE(div);
776 ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode);
778 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
779 ret = ad7192_set_3db_filter_freq(st, val, val2 / 1000);
785 iio_device_release_direct_mode(indio_dev);
790 static int ad7192_write_raw_get_fmt(struct iio_dev *indio_dev,
791 struct iio_chan_spec const *chan,
795 case IIO_CHAN_INFO_SCALE:
796 return IIO_VAL_INT_PLUS_NANO;
797 case IIO_CHAN_INFO_SAMP_FREQ:
799 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
800 return IIO_VAL_INT_PLUS_MICRO;
806 static int ad7192_read_avail(struct iio_dev *indio_dev,
807 struct iio_chan_spec const *chan,
808 const int **vals, int *type, int *length,
811 struct ad7192_state *st = iio_priv(indio_dev);
814 case IIO_CHAN_INFO_SCALE:
815 *vals = (int *)st->scale_avail;
816 *type = IIO_VAL_INT_PLUS_NANO;
817 /* Values are stored in a 2D matrix */
818 *length = ARRAY_SIZE(st->scale_avail) * 2;
820 return IIO_AVAIL_LIST;
826 static int ad7192_update_scan_mode(struct iio_dev *indio_dev, const unsigned long *scan_mask)
828 struct ad7192_state *st = iio_priv(indio_dev);
833 conf &= ~AD7192_CONF_CHAN_MASK;
834 for_each_set_bit(i, scan_mask, 8)
835 conf |= AD7192_CONF_CHAN(i);
837 ret = ad_sd_write_reg(&st->sd, AD7192_REG_CONF, 3, conf);
846 static const struct iio_info ad7192_info = {
847 .read_raw = ad7192_read_raw,
848 .write_raw = ad7192_write_raw,
849 .write_raw_get_fmt = ad7192_write_raw_get_fmt,
850 .read_avail = ad7192_read_avail,
851 .attrs = &ad7192_attribute_group,
852 .validate_trigger = ad_sd_validate_trigger,
853 .update_scan_mode = ad7192_update_scan_mode,
856 static const struct iio_info ad7195_info = {
857 .read_raw = ad7192_read_raw,
858 .write_raw = ad7192_write_raw,
859 .write_raw_get_fmt = ad7192_write_raw_get_fmt,
860 .read_avail = ad7192_read_avail,
861 .attrs = &ad7195_attribute_group,
862 .validate_trigger = ad_sd_validate_trigger,
863 .update_scan_mode = ad7192_update_scan_mode,
866 #define __AD719x_CHANNEL(_si, _channel1, _channel2, _address, _extend_name, \
867 _type, _mask_type_av, _ext_info) \
870 .differential = ((_channel2) == -1 ? 0 : 1), \
872 .channel = (_channel1), \
873 .channel2 = (_channel2), \
874 .address = (_address), \
875 .extend_name = (_extend_name), \
876 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
877 BIT(IIO_CHAN_INFO_OFFSET), \
878 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
879 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
880 BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), \
881 .info_mask_shared_by_type_available = (_mask_type_av), \
882 .ext_info = (_ext_info), \
883 .scan_index = (_si), \
888 .endianness = IIO_BE, \
892 #define AD719x_DIFF_CHANNEL(_si, _channel1, _channel2, _address) \
893 __AD719x_CHANNEL(_si, _channel1, _channel2, _address, NULL, \
894 IIO_VOLTAGE, BIT(IIO_CHAN_INFO_SCALE), \
895 ad7192_calibsys_ext_info)
897 #define AD719x_CHANNEL(_si, _channel1, _address) \
898 __AD719x_CHANNEL(_si, _channel1, -1, _address, NULL, IIO_VOLTAGE, \
899 BIT(IIO_CHAN_INFO_SCALE), ad7192_calibsys_ext_info)
901 #define AD719x_SHORTED_CHANNEL(_si, _channel1, _address) \
902 __AD719x_CHANNEL(_si, _channel1, -1, _address, "shorted", IIO_VOLTAGE, \
903 BIT(IIO_CHAN_INFO_SCALE), ad7192_calibsys_ext_info)
905 #define AD719x_TEMP_CHANNEL(_si, _address) \
906 __AD719x_CHANNEL(_si, 0, -1, _address, NULL, IIO_TEMP, 0, NULL)
908 static const struct iio_chan_spec ad7192_channels[] = {
909 AD719x_DIFF_CHANNEL(0, 1, 2, AD7192_CH_AIN1P_AIN2M),
910 AD719x_DIFF_CHANNEL(1, 3, 4, AD7192_CH_AIN3P_AIN4M),
911 AD719x_TEMP_CHANNEL(2, AD7192_CH_TEMP),
912 AD719x_SHORTED_CHANNEL(3, 2, AD7192_CH_AIN2P_AIN2M),
913 AD719x_CHANNEL(4, 1, AD7192_CH_AIN1),
914 AD719x_CHANNEL(5, 2, AD7192_CH_AIN2),
915 AD719x_CHANNEL(6, 3, AD7192_CH_AIN3),
916 AD719x_CHANNEL(7, 4, AD7192_CH_AIN4),
917 IIO_CHAN_SOFT_TIMESTAMP(8),
920 static const struct iio_chan_spec ad7193_channels[] = {
921 AD719x_DIFF_CHANNEL(0, 1, 2, AD7193_CH_AIN1P_AIN2M),
922 AD719x_DIFF_CHANNEL(1, 3, 4, AD7193_CH_AIN3P_AIN4M),
923 AD719x_DIFF_CHANNEL(2, 5, 6, AD7193_CH_AIN5P_AIN6M),
924 AD719x_DIFF_CHANNEL(3, 7, 8, AD7193_CH_AIN7P_AIN8M),
925 AD719x_TEMP_CHANNEL(4, AD7193_CH_TEMP),
926 AD719x_SHORTED_CHANNEL(5, 2, AD7193_CH_AIN2P_AIN2M),
927 AD719x_CHANNEL(6, 1, AD7193_CH_AIN1),
928 AD719x_CHANNEL(7, 2, AD7193_CH_AIN2),
929 AD719x_CHANNEL(8, 3, AD7193_CH_AIN3),
930 AD719x_CHANNEL(9, 4, AD7193_CH_AIN4),
931 AD719x_CHANNEL(10, 5, AD7193_CH_AIN5),
932 AD719x_CHANNEL(11, 6, AD7193_CH_AIN6),
933 AD719x_CHANNEL(12, 7, AD7193_CH_AIN7),
934 AD719x_CHANNEL(13, 8, AD7193_CH_AIN8),
935 IIO_CHAN_SOFT_TIMESTAMP(14),
938 static const struct ad7192_chip_info ad7192_chip_info_tbl[] = {
940 .chip_id = CHIPID_AD7190,
944 .chip_id = CHIPID_AD7192,
948 .chip_id = CHIPID_AD7193,
952 .chip_id = CHIPID_AD7195,
957 static int ad7192_channels_config(struct iio_dev *indio_dev)
959 struct ad7192_state *st = iio_priv(indio_dev);
961 switch (st->chip_info->chip_id) {
963 indio_dev->channels = ad7193_channels;
964 indio_dev->num_channels = ARRAY_SIZE(ad7193_channels);
967 indio_dev->channels = ad7192_channels;
968 indio_dev->num_channels = ARRAY_SIZE(ad7192_channels);
975 static void ad7192_reg_disable(void *reg)
977 regulator_disable(reg);
980 static void ad7192_clk_disable(void *clk)
982 clk_disable_unprepare(clk);
985 static int ad7192_probe(struct spi_device *spi)
987 struct ad7192_state *st;
988 struct iio_dev *indio_dev;
992 dev_err(&spi->dev, "no IRQ?\n");
996 indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
1000 st = iio_priv(indio_dev);
1002 mutex_init(&st->lock);
1004 st->avdd = devm_regulator_get(&spi->dev, "avdd");
1005 if (IS_ERR(st->avdd))
1006 return PTR_ERR(st->avdd);
1008 ret = regulator_enable(st->avdd);
1010 dev_err(&spi->dev, "Failed to enable specified AVdd supply\n");
1014 ret = devm_add_action_or_reset(&spi->dev, ad7192_reg_disable, st->avdd);
1018 st->dvdd = devm_regulator_get(&spi->dev, "dvdd");
1019 if (IS_ERR(st->dvdd))
1020 return PTR_ERR(st->dvdd);
1022 ret = regulator_enable(st->dvdd);
1024 dev_err(&spi->dev, "Failed to enable specified DVdd supply\n");
1028 ret = devm_add_action_or_reset(&spi->dev, ad7192_reg_disable, st->dvdd);
1032 ret = regulator_get_voltage(st->avdd);
1034 dev_err(&spi->dev, "Device tree error, reference voltage undefined\n");
1037 st->int_vref_mv = ret / 1000;
1039 st->chip_info = of_device_get_match_data(&spi->dev);
1040 indio_dev->name = st->chip_info->name;
1041 indio_dev->modes = INDIO_DIRECT_MODE;
1043 ret = ad7192_channels_config(indio_dev);
1047 if (st->chip_info->chip_id == CHIPID_AD7195)
1048 indio_dev->info = &ad7195_info;
1050 indio_dev->info = &ad7192_info;
1052 ad_sd_init(&st->sd, indio_dev, spi, &ad7192_sigma_delta_info);
1054 ret = devm_ad_sd_setup_buffer_and_trigger(&spi->dev, indio_dev);
1058 st->fclk = AD7192_INT_FREQ_MHZ;
1060 st->mclk = devm_clk_get_optional(&spi->dev, "mclk");
1061 if (IS_ERR(st->mclk))
1062 return PTR_ERR(st->mclk);
1064 st->clock_sel = ad7192_of_clock_select(st);
1066 if (st->clock_sel == AD7192_CLK_EXT_MCLK1_2 ||
1067 st->clock_sel == AD7192_CLK_EXT_MCLK2) {
1068 ret = clk_prepare_enable(st->mclk);
1072 ret = devm_add_action_or_reset(&spi->dev, ad7192_clk_disable,
1077 st->fclk = clk_get_rate(st->mclk);
1078 if (!ad7192_valid_external_frequency(st->fclk)) {
1080 "External clock frequency out of bounds\n");
1085 ret = ad7192_setup(st, spi->dev.of_node);
1089 return devm_iio_device_register(&spi->dev, indio_dev);
1092 static const struct of_device_id ad7192_of_match[] = {
1093 { .compatible = "adi,ad7190", .data = &ad7192_chip_info_tbl[ID_AD7190] },
1094 { .compatible = "adi,ad7192", .data = &ad7192_chip_info_tbl[ID_AD7192] },
1095 { .compatible = "adi,ad7193", .data = &ad7192_chip_info_tbl[ID_AD7193] },
1096 { .compatible = "adi,ad7195", .data = &ad7192_chip_info_tbl[ID_AD7195] },
1099 MODULE_DEVICE_TABLE(of, ad7192_of_match);
1101 static struct spi_driver ad7192_driver = {
1104 .of_match_table = ad7192_of_match,
1106 .probe = ad7192_probe,
1108 module_spi_driver(ad7192_driver);
1110 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
1111 MODULE_DESCRIPTION("Analog Devices AD7190, AD7192, AD7193, AD7195 ADC");
1112 MODULE_LICENSE("GPL v2");
1113 MODULE_IMPORT_NS(IIO_AD_SIGMA_DELTA);