2 * AD7190 AD7192 AD7193 AD7195 SPI ADC driver
4 * Copyright 2011-2015 Analog Devices Inc.
6 * Licensed under the GPL-2.
9 #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>
20 #include <linux/iio/iio.h>
21 #include <linux/iio/sysfs.h>
22 #include <linux/iio/buffer.h>
23 #include <linux/iio/trigger.h>
24 #include <linux/iio/trigger_consumer.h>
25 #include <linux/iio/triggered_buffer.h>
26 #include <linux/iio/adc/ad_sigma_delta.h>
31 #define AD7192_REG_COMM 0 /* Communications Register (WO, 8-bit) */
32 #define AD7192_REG_STAT 0 /* Status Register (RO, 8-bit) */
33 #define AD7192_REG_MODE 1 /* Mode Register (RW, 24-bit */
34 #define AD7192_REG_CONF 2 /* Configuration Register (RW, 24-bit) */
35 #define AD7192_REG_DATA 3 /* Data Register (RO, 24/32-bit) */
36 #define AD7192_REG_ID 4 /* ID Register (RO, 8-bit) */
37 #define AD7192_REG_GPOCON 5 /* GPOCON Register (RO, 8-bit) */
38 #define AD7192_REG_OFFSET 6 /* Offset Register (RW, 16-bit */
39 /* (AD7792)/24-bit (AD7192)) */
40 #define AD7192_REG_FULLSALE 7 /* Full-Scale Register */
41 /* (RW, 16-bit (AD7792)/24-bit (AD7192)) */
43 /* Communications Register Bit Designations (AD7192_REG_COMM) */
44 #define AD7192_COMM_WEN BIT(7) /* Write Enable */
45 #define AD7192_COMM_WRITE 0 /* Write Operation */
46 #define AD7192_COMM_READ BIT(6) /* Read Operation */
47 #define AD7192_COMM_ADDR(x) (((x) & 0x7) << 3) /* Register Address */
48 #define AD7192_COMM_CREAD BIT(2) /* Continuous Read of Data Register */
50 /* Status Register Bit Designations (AD7192_REG_STAT) */
51 #define AD7192_STAT_RDY BIT(7) /* Ready */
52 #define AD7192_STAT_ERR BIT(6) /* Error (Overrange, Underrange) */
53 #define AD7192_STAT_NOREF BIT(5) /* Error no external reference */
54 #define AD7192_STAT_PARITY BIT(4) /* Parity */
55 #define AD7192_STAT_CH3 BIT(2) /* Channel 3 */
56 #define AD7192_STAT_CH2 BIT(1) /* Channel 2 */
57 #define AD7192_STAT_CH1 BIT(0) /* Channel 1 */
59 /* Mode Register Bit Designations (AD7192_REG_MODE) */
60 #define AD7192_MODE_SEL(x) (((x) & 0x7) << 21) /* Operation Mode Select */
61 #define AD7192_MODE_SEL_MASK (0x7 << 21) /* Operation Mode Select Mask */
62 #define AD7192_MODE_DAT_STA BIT(20) /* Status Register transmission */
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 ID_AD7190 0x4
130 #define ID_AD7192 0x0
131 #define ID_AD7193 0x2
132 #define ID_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
149 * The AD7190/2/5 features a dual use data out ready DOUT/RDY output.
150 * In order to avoid contentions on the SPI bus, it's therefore necessary
151 * to use spi bus locking.
153 * The DOUT/RDY output must also be wired to an interrupt capable GPIO.
156 struct ad7192_state {
157 struct regulator *reg;
163 u32 scale_avail[8][2];
167 struct ad_sigma_delta sd;
170 static struct ad7192_state *ad_sigma_delta_to_ad7192(struct ad_sigma_delta *sd)
172 return container_of(sd, struct ad7192_state, sd);
175 static int ad7192_set_channel(struct ad_sigma_delta *sd, unsigned int channel)
177 struct ad7192_state *st = ad_sigma_delta_to_ad7192(sd);
179 st->conf &= ~AD7192_CONF_CHAN_MASK;
180 st->conf |= AD7192_CONF_CHAN(channel);
182 return ad_sd_write_reg(&st->sd, AD7192_REG_CONF, 3, st->conf);
185 static int ad7192_set_mode(struct ad_sigma_delta *sd,
186 enum ad_sigma_delta_mode mode)
188 struct ad7192_state *st = ad_sigma_delta_to_ad7192(sd);
190 st->mode &= ~AD7192_MODE_SEL_MASK;
191 st->mode |= AD7192_MODE_SEL(mode);
193 return ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode);
196 static const struct ad_sigma_delta_info ad7192_sigma_delta_info = {
197 .set_channel = ad7192_set_channel,
198 .set_mode = ad7192_set_mode,
199 .has_registers = true,
204 static const struct ad_sd_calib_data ad7192_calib_arr[8] = {
205 {AD7192_MODE_CAL_INT_ZERO, AD7192_CH_AIN1},
206 {AD7192_MODE_CAL_INT_FULL, AD7192_CH_AIN1},
207 {AD7192_MODE_CAL_INT_ZERO, AD7192_CH_AIN2},
208 {AD7192_MODE_CAL_INT_FULL, AD7192_CH_AIN2},
209 {AD7192_MODE_CAL_INT_ZERO, AD7192_CH_AIN3},
210 {AD7192_MODE_CAL_INT_FULL, AD7192_CH_AIN3},
211 {AD7192_MODE_CAL_INT_ZERO, AD7192_CH_AIN4},
212 {AD7192_MODE_CAL_INT_FULL, AD7192_CH_AIN4}
215 static int ad7192_calibrate_all(struct ad7192_state *st)
217 return ad_sd_calibrate_all(&st->sd, ad7192_calib_arr,
218 ARRAY_SIZE(ad7192_calib_arr));
221 static inline bool ad7192_valid_external_frequency(u32 freq)
223 return (freq >= AD7192_EXT_FREQ_MHZ_MIN &&
224 freq <= AD7192_EXT_FREQ_MHZ_MAX);
227 static int ad7192_setup(struct ad7192_state *st,
228 const struct ad7192_platform_data *pdata)
230 struct iio_dev *indio_dev = spi_get_drvdata(st->sd.spi);
231 unsigned long long scale_uv;
234 /* reset the serial interface */
235 ret = ad_sd_reset(&st->sd, 48);
238 usleep_range(500, 1000); /* Wait for at least 500us */
240 /* write/read test for device presence */
241 ret = ad_sd_read_reg(&st->sd, AD7192_REG_ID, 1, &id);
245 id &= AD7192_ID_MASK;
248 dev_warn(&st->sd.spi->dev, "device ID query failed (0x%X)\n",
251 switch (pdata->clock_source_sel) {
253 case AD7192_CLK_INT_CO:
254 st->mclk = AD7192_INT_FREQ_MHZ;
256 case AD7192_CLK_EXT_MCLK1_2:
257 case AD7192_CLK_EXT_MCLK2:
258 if (ad7192_valid_external_frequency(pdata->ext_clk_hz)) {
259 st->mclk = pdata->ext_clk_hz;
262 dev_err(&st->sd.spi->dev, "Invalid frequency setting %u\n",
271 st->mode = AD7192_MODE_SEL(AD7192_MODE_IDLE) |
272 AD7192_MODE_CLKSRC(pdata->clock_source_sel) |
273 AD7192_MODE_RATE(480);
275 st->conf = AD7192_CONF_GAIN(0);
278 st->mode |= AD7192_MODE_REJ60;
281 st->mode |= AD7192_MODE_SINC3;
283 if (pdata->refin2_en && (st->devid != ID_AD7195))
284 st->conf |= AD7192_CONF_REFSEL;
286 if (pdata->chop_en) {
287 st->conf |= AD7192_CONF_CHOP;
289 st->f_order = 3; /* SINC 3rd order */
291 st->f_order = 4; /* SINC 4th order */
297 st->conf |= AD7192_CONF_BUF;
299 if (pdata->unipolar_en)
300 st->conf |= AD7192_CONF_UNIPOLAR;
302 if (pdata->burnout_curr_en)
303 st->conf |= AD7192_CONF_BURN;
305 ret = ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode);
309 ret = ad_sd_write_reg(&st->sd, AD7192_REG_CONF, 3, st->conf);
313 ret = ad7192_calibrate_all(st);
317 /* Populate available ADC input ranges */
318 for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++) {
319 scale_uv = ((u64)st->int_vref_mv * 100000000)
320 >> (indio_dev->channels[0].scan_type.realbits -
321 ((st->conf & AD7192_CONF_UNIPOLAR) ? 0 : 1));
324 st->scale_avail[i][1] = do_div(scale_uv, 100000000) * 10;
325 st->scale_avail[i][0] = scale_uv;
330 dev_err(&st->sd.spi->dev, "setup failed\n");
334 static ssize_t ad7192_read_frequency(struct device *dev,
335 struct device_attribute *attr,
338 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
339 struct ad7192_state *st = iio_priv(indio_dev);
341 return sprintf(buf, "%d\n", st->mclk /
342 (st->f_order * 1024 * AD7192_MODE_RATE(st->mode)));
345 static ssize_t ad7192_write_frequency(struct device *dev,
346 struct device_attribute *attr,
350 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
351 struct ad7192_state *st = iio_priv(indio_dev);
355 ret = kstrtoul(buf, 10, &lval);
361 ret = iio_device_claim_direct_mode(indio_dev);
365 div = st->mclk / (lval * st->f_order * 1024);
366 if (div < 1 || div > 1023) {
371 st->mode &= ~AD7192_MODE_RATE(-1);
372 st->mode |= AD7192_MODE_RATE(div);
373 ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode);
376 iio_device_release_direct_mode(indio_dev);
378 return ret ? ret : len;
381 static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
382 ad7192_read_frequency,
383 ad7192_write_frequency);
386 ad7192_show_scale_available(struct device *dev,
387 struct device_attribute *attr, char *buf)
389 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
390 struct ad7192_state *st = iio_priv(indio_dev);
393 for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++)
394 len += sprintf(buf + len, "%d.%09u ", st->scale_avail[i][0],
395 st->scale_avail[i][1]);
397 len += sprintf(buf + len, "\n");
402 static IIO_DEVICE_ATTR_NAMED(in_v_m_v_scale_available,
403 in_voltage-voltage_scale_available,
404 S_IRUGO, ad7192_show_scale_available, NULL, 0);
406 static IIO_DEVICE_ATTR(in_voltage_scale_available, S_IRUGO,
407 ad7192_show_scale_available, NULL, 0);
409 static ssize_t ad7192_show_ac_excitation(struct device *dev,
410 struct device_attribute *attr,
413 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
414 struct ad7192_state *st = iio_priv(indio_dev);
416 return sprintf(buf, "%d\n", !!(st->mode & AD7192_MODE_ACX));
419 static ssize_t ad7192_show_bridge_switch(struct device *dev,
420 struct device_attribute *attr,
423 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
424 struct ad7192_state *st = iio_priv(indio_dev);
426 return sprintf(buf, "%d\n", !!(st->gpocon & AD7192_GPOCON_BPDSW));
429 static ssize_t ad7192_set(struct device *dev,
430 struct device_attribute *attr,
434 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
435 struct ad7192_state *st = iio_priv(indio_dev);
436 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
440 ret = strtobool(buf, &val);
444 ret = iio_device_claim_direct_mode(indio_dev);
448 switch ((u32)this_attr->address) {
449 case AD7192_REG_GPOCON:
451 st->gpocon |= AD7192_GPOCON_BPDSW;
453 st->gpocon &= ~AD7192_GPOCON_BPDSW;
455 ad_sd_write_reg(&st->sd, AD7192_REG_GPOCON, 1, st->gpocon);
457 case AD7192_REG_MODE:
459 st->mode |= AD7192_MODE_ACX;
461 st->mode &= ~AD7192_MODE_ACX;
463 ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode);
469 iio_device_release_direct_mode(indio_dev);
471 return ret ? ret : len;
474 static IIO_DEVICE_ATTR(bridge_switch_en, S_IRUGO | S_IWUSR,
475 ad7192_show_bridge_switch, ad7192_set,
478 static IIO_DEVICE_ATTR(ac_excitation_en, S_IRUGO | S_IWUSR,
479 ad7192_show_ac_excitation, ad7192_set,
482 static struct attribute *ad7192_attributes[] = {
483 &iio_dev_attr_sampling_frequency.dev_attr.attr,
484 &iio_dev_attr_in_v_m_v_scale_available.dev_attr.attr,
485 &iio_dev_attr_in_voltage_scale_available.dev_attr.attr,
486 &iio_dev_attr_bridge_switch_en.dev_attr.attr,
487 &iio_dev_attr_ac_excitation_en.dev_attr.attr,
491 static const struct attribute_group ad7192_attribute_group = {
492 .attrs = ad7192_attributes,
495 static struct attribute *ad7195_attributes[] = {
496 &iio_dev_attr_sampling_frequency.dev_attr.attr,
497 &iio_dev_attr_in_v_m_v_scale_available.dev_attr.attr,
498 &iio_dev_attr_in_voltage_scale_available.dev_attr.attr,
499 &iio_dev_attr_bridge_switch_en.dev_attr.attr,
503 static const struct attribute_group ad7195_attribute_group = {
504 .attrs = ad7195_attributes,
507 static unsigned int ad7192_get_temp_scale(bool unipolar)
509 return unipolar ? 2815 * 2 : 2815;
512 static int ad7192_read_raw(struct iio_dev *indio_dev,
513 struct iio_chan_spec const *chan,
518 struct ad7192_state *st = iio_priv(indio_dev);
519 bool unipolar = !!(st->conf & AD7192_CONF_UNIPOLAR);
522 case IIO_CHAN_INFO_RAW:
523 return ad_sigma_delta_single_conversion(indio_dev, chan, val);
524 case IIO_CHAN_INFO_SCALE:
525 switch (chan->type) {
527 mutex_lock(&indio_dev->mlock);
528 *val = st->scale_avail[AD7192_CONF_GAIN(st->conf)][0];
529 *val2 = st->scale_avail[AD7192_CONF_GAIN(st->conf)][1];
530 mutex_unlock(&indio_dev->mlock);
531 return IIO_VAL_INT_PLUS_NANO;
534 *val2 = 1000000000 / ad7192_get_temp_scale(unipolar);
535 return IIO_VAL_INT_PLUS_NANO;
539 case IIO_CHAN_INFO_OFFSET:
541 *val = -(1 << (chan->scan_type.realbits - 1));
544 /* Kelvin to Celsius */
545 if (chan->type == IIO_TEMP)
546 *val -= 273 * ad7192_get_temp_scale(unipolar);
553 static int ad7192_write_raw(struct iio_dev *indio_dev,
554 struct iio_chan_spec const *chan,
559 struct ad7192_state *st = iio_priv(indio_dev);
563 ret = iio_device_claim_direct_mode(indio_dev);
568 case IIO_CHAN_INFO_SCALE:
570 for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++)
571 if (val2 == st->scale_avail[i][1]) {
574 st->conf &= ~AD7192_CONF_GAIN(-1);
575 st->conf |= AD7192_CONF_GAIN(i);
578 ad_sd_write_reg(&st->sd, AD7192_REG_CONF,
580 ad7192_calibrate_all(st);
588 iio_device_release_direct_mode(indio_dev);
593 static int ad7192_write_raw_get_fmt(struct iio_dev *indio_dev,
594 struct iio_chan_spec const *chan,
597 return IIO_VAL_INT_PLUS_NANO;
600 static const struct iio_info ad7192_info = {
601 .read_raw = &ad7192_read_raw,
602 .write_raw = &ad7192_write_raw,
603 .write_raw_get_fmt = &ad7192_write_raw_get_fmt,
604 .attrs = &ad7192_attribute_group,
605 .validate_trigger = ad_sd_validate_trigger,
606 .driver_module = THIS_MODULE,
609 static const struct iio_info ad7195_info = {
610 .read_raw = &ad7192_read_raw,
611 .write_raw = &ad7192_write_raw,
612 .write_raw_get_fmt = &ad7192_write_raw_get_fmt,
613 .attrs = &ad7195_attribute_group,
614 .validate_trigger = ad_sd_validate_trigger,
615 .driver_module = THIS_MODULE,
618 static const struct iio_chan_spec ad7192_channels[] = {
619 AD_SD_DIFF_CHANNEL(0, 1, 2, AD7192_CH_AIN1P_AIN2M, 24, 32, 0),
620 AD_SD_DIFF_CHANNEL(1, 3, 4, AD7192_CH_AIN3P_AIN4M, 24, 32, 0),
621 AD_SD_TEMP_CHANNEL(2, AD7192_CH_TEMP, 24, 32, 0),
622 AD_SD_SHORTED_CHANNEL(3, 2, AD7192_CH_AIN2P_AIN2M, 24, 32, 0),
623 AD_SD_CHANNEL(4, 1, AD7192_CH_AIN1, 24, 32, 0),
624 AD_SD_CHANNEL(5, 2, AD7192_CH_AIN2, 24, 32, 0),
625 AD_SD_CHANNEL(6, 3, AD7192_CH_AIN3, 24, 32, 0),
626 AD_SD_CHANNEL(7, 4, AD7192_CH_AIN4, 24, 32, 0),
627 IIO_CHAN_SOFT_TIMESTAMP(8),
630 static const struct iio_chan_spec ad7193_channels[] = {
631 AD_SD_DIFF_CHANNEL(0, 1, 2, AD7193_CH_AIN1P_AIN2M, 24, 32, 0),
632 AD_SD_DIFF_CHANNEL(1, 3, 4, AD7193_CH_AIN3P_AIN4M, 24, 32, 0),
633 AD_SD_DIFF_CHANNEL(2, 5, 6, AD7193_CH_AIN5P_AIN6M, 24, 32, 0),
634 AD_SD_DIFF_CHANNEL(3, 7, 8, AD7193_CH_AIN7P_AIN8M, 24, 32, 0),
635 AD_SD_TEMP_CHANNEL(4, AD7193_CH_TEMP, 24, 32, 0),
636 AD_SD_SHORTED_CHANNEL(5, 2, AD7193_CH_AIN2P_AIN2M, 24, 32, 0),
637 AD_SD_CHANNEL(6, 1, AD7193_CH_AIN1, 24, 32, 0),
638 AD_SD_CHANNEL(7, 2, AD7193_CH_AIN2, 24, 32, 0),
639 AD_SD_CHANNEL(8, 3, AD7193_CH_AIN3, 24, 32, 0),
640 AD_SD_CHANNEL(9, 4, AD7193_CH_AIN4, 24, 32, 0),
641 AD_SD_CHANNEL(10, 5, AD7193_CH_AIN5, 24, 32, 0),
642 AD_SD_CHANNEL(11, 6, AD7193_CH_AIN6, 24, 32, 0),
643 AD_SD_CHANNEL(12, 7, AD7193_CH_AIN7, 24, 32, 0),
644 AD_SD_CHANNEL(13, 8, AD7193_CH_AIN8, 24, 32, 0),
645 IIO_CHAN_SOFT_TIMESTAMP(14),
648 static int ad7192_probe(struct spi_device *spi)
650 const struct ad7192_platform_data *pdata = dev_get_platdata(&spi->dev);
651 struct ad7192_state *st;
652 struct iio_dev *indio_dev;
653 int ret, voltage_uv = 0;
656 dev_err(&spi->dev, "no platform data?\n");
661 dev_err(&spi->dev, "no IRQ?\n");
665 indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
669 st = iio_priv(indio_dev);
671 st->reg = devm_regulator_get(&spi->dev, "vcc");
672 if (!IS_ERR(st->reg)) {
673 ret = regulator_enable(st->reg);
677 voltage_uv = regulator_get_voltage(st->reg);
681 st->int_vref_mv = pdata->vref_mv;
683 st->int_vref_mv = voltage_uv / 1000;
685 dev_warn(&spi->dev, "reference voltage undefined\n");
687 spi_set_drvdata(spi, indio_dev);
688 st->devid = spi_get_device_id(spi)->driver_data;
689 indio_dev->dev.parent = &spi->dev;
690 indio_dev->name = spi_get_device_id(spi)->name;
691 indio_dev->modes = INDIO_DIRECT_MODE;
695 indio_dev->channels = ad7193_channels;
696 indio_dev->num_channels = ARRAY_SIZE(ad7193_channels);
699 indio_dev->channels = ad7192_channels;
700 indio_dev->num_channels = ARRAY_SIZE(ad7192_channels);
704 if (st->devid == ID_AD7195)
705 indio_dev->info = &ad7195_info;
707 indio_dev->info = &ad7192_info;
709 ad_sd_init(&st->sd, indio_dev, spi, &ad7192_sigma_delta_info);
711 ret = ad_sd_setup_buffer_and_trigger(indio_dev);
713 goto error_disable_reg;
715 ret = ad7192_setup(st, pdata);
717 goto error_remove_trigger;
719 ret = iio_device_register(indio_dev);
721 goto error_remove_trigger;
724 error_remove_trigger:
725 ad_sd_cleanup_buffer_and_trigger(indio_dev);
727 if (!IS_ERR(st->reg))
728 regulator_disable(st->reg);
733 static int ad7192_remove(struct spi_device *spi)
735 struct iio_dev *indio_dev = spi_get_drvdata(spi);
736 struct ad7192_state *st = iio_priv(indio_dev);
738 iio_device_unregister(indio_dev);
739 ad_sd_cleanup_buffer_and_trigger(indio_dev);
741 if (!IS_ERR(st->reg))
742 regulator_disable(st->reg);
747 static const struct spi_device_id ad7192_id[] = {
748 {"ad7190", ID_AD7190},
749 {"ad7192", ID_AD7192},
750 {"ad7193", ID_AD7193},
751 {"ad7195", ID_AD7195},
754 MODULE_DEVICE_TABLE(spi, ad7192_id);
756 static struct spi_driver ad7192_driver = {
760 .probe = ad7192_probe,
761 .remove = ad7192_remove,
762 .id_table = ad7192_id,
764 module_spi_driver(ad7192_driver);
766 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
767 MODULE_DESCRIPTION("Analog Devices AD7190, AD7192, AD7193, AD7195 ADC");
768 MODULE_LICENSE("GPL v2");