2 * AD7746 capacitive sensor driver supporting AD7745, AD7746 and AD7747
4 * Copyright 2011 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/i2c.h>
15 #include <linux/delay.h>
16 #include <linux/module.h>
17 #include <linux/stat.h>
19 #include <linux/iio/iio.h>
20 #include <linux/iio/sysfs.h>
25 * AD7746 Register Definition
28 #define AD7746_REG_STATUS 0
29 #define AD7746_REG_CAP_DATA_HIGH 1
30 #define AD7746_REG_CAP_DATA_MID 2
31 #define AD7746_REG_CAP_DATA_LOW 3
32 #define AD7746_REG_VT_DATA_HIGH 4
33 #define AD7746_REG_VT_DATA_MID 5
34 #define AD7746_REG_VT_DATA_LOW 6
35 #define AD7746_REG_CAP_SETUP 7
36 #define AD7746_REG_VT_SETUP 8
37 #define AD7746_REG_EXC_SETUP 9
38 #define AD7746_REG_CFG 10
39 #define AD7746_REG_CAPDACA 11
40 #define AD7746_REG_CAPDACB 12
41 #define AD7746_REG_CAP_OFFH 13
42 #define AD7746_REG_CAP_OFFL 14
43 #define AD7746_REG_CAP_GAINH 15
44 #define AD7746_REG_CAP_GAINL 16
45 #define AD7746_REG_VOLT_GAINH 17
46 #define AD7746_REG_VOLT_GAINL 18
48 /* Status Register Bit Designations (AD7746_REG_STATUS) */
49 #define AD7746_STATUS_EXCERR (1 << 3)
50 #define AD7746_STATUS_RDY (1 << 2)
51 #define AD7746_STATUS_RDYVT (1 << 1)
52 #define AD7746_STATUS_RDYCAP (1 << 0)
54 /* Capacitive Channel Setup Register Bit Designations (AD7746_REG_CAP_SETUP) */
55 #define AD7746_CAPSETUP_CAPEN (1 << 7)
56 #define AD7746_CAPSETUP_CIN2 (1 << 6) /* AD7746 only */
57 #define AD7746_CAPSETUP_CAPDIFF (1 << 5)
58 #define AD7746_CAPSETUP_CACHOP (1 << 0)
60 /* Voltage/Temperature Setup Register Bit Designations (AD7746_REG_VT_SETUP) */
61 #define AD7746_VTSETUP_VTEN (1 << 7)
62 #define AD7746_VTSETUP_VTMD_INT_TEMP (0 << 5)
63 #define AD7746_VTSETUP_VTMD_EXT_TEMP (1 << 5)
64 #define AD7746_VTSETUP_VTMD_VDD_MON (2 << 5)
65 #define AD7746_VTSETUP_VTMD_EXT_VIN (3 << 5)
66 #define AD7746_VTSETUP_EXTREF (1 << 4)
67 #define AD7746_VTSETUP_VTSHORT (1 << 1)
68 #define AD7746_VTSETUP_VTCHOP (1 << 0)
70 /* Excitation Setup Register Bit Designations (AD7746_REG_EXC_SETUP) */
71 #define AD7746_EXCSETUP_CLKCTRL (1 << 7)
72 #define AD7746_EXCSETUP_EXCON (1 << 6)
73 #define AD7746_EXCSETUP_EXCB (1 << 5)
74 #define AD7746_EXCSETUP_NEXCB (1 << 4)
75 #define AD7746_EXCSETUP_EXCA (1 << 3)
76 #define AD7746_EXCSETUP_NEXCA (1 << 2)
77 #define AD7746_EXCSETUP_EXCLVL(x) (((x) & 0x3) << 0)
79 /* Config Register Bit Designations (AD7746_REG_CFG) */
80 #define AD7746_CONF_VTFS(x) ((x) << 6)
81 #define AD7746_CONF_CAPFS(x) ((x) << 3)
82 #define AD7746_CONF_MODE_IDLE (0 << 0)
83 #define AD7746_CONF_MODE_CONT_CONV (1 << 0)
84 #define AD7746_CONF_MODE_SINGLE_CONV (2 << 0)
85 #define AD7746_CONF_MODE_PWRDN (3 << 0)
86 #define AD7746_CONF_MODE_OFFS_CAL (5 << 0)
87 #define AD7746_CONF_MODE_GAIN_CAL (6 << 0)
89 /* CAPDAC Register Bit Designations (AD7746_REG_CAPDACx) */
90 #define AD7746_CAPDAC_DACEN (1 << 7)
91 #define AD7746_CAPDAC_DACP(x) ((x) & 0x7F)
94 * struct ad7746_chip_info - chip specifc information
97 struct ad7746_chip_info
{
98 struct i2c_client
*client
;
100 * Capacitive channel digital filter setup;
101 * conversion time/update rate setup per channel
112 } data ____cacheline_aligned
;
126 static const struct iio_chan_spec ad7746_channels
[] = {
131 .info_mask_separate
= BIT(IIO_CHAN_INFO_RAW
),
132 .info_mask_shared_by_type
= BIT(IIO_CHAN_INFO_SCALE
),
133 .address
= AD7746_REG_VT_DATA_HIGH
<< 8 |
134 AD7746_VTSETUP_VTMD_EXT_VIN
,
140 .extend_name
= "supply",
141 .info_mask_separate
= BIT(IIO_CHAN_INFO_RAW
),
142 .info_mask_shared_by_type
= BIT(IIO_CHAN_INFO_SCALE
),
143 .address
= AD7746_REG_VT_DATA_HIGH
<< 8 |
144 AD7746_VTSETUP_VTMD_VDD_MON
,
150 .info_mask_separate
= BIT(IIO_CHAN_INFO_PROCESSED
),
151 .address
= AD7746_REG_VT_DATA_HIGH
<< 8 |
152 AD7746_VTSETUP_VTMD_INT_TEMP
,
158 .info_mask_separate
= BIT(IIO_CHAN_INFO_PROCESSED
),
159 .address
= AD7746_REG_VT_DATA_HIGH
<< 8 |
160 AD7746_VTSETUP_VTMD_EXT_TEMP
,
163 .type
= IIO_CAPACITANCE
,
166 .info_mask_separate
= BIT(IIO_CHAN_INFO_RAW
) |
167 BIT(IIO_CHAN_INFO_CALIBSCALE
) | BIT(IIO_CHAN_INFO_OFFSET
),
168 .info_mask_shared_by_type
= BIT(IIO_CHAN_INFO_CALIBBIAS
) |
169 BIT(IIO_CHAN_INFO_SCALE
),
170 .address
= AD7746_REG_CAP_DATA_HIGH
<< 8,
173 .type
= IIO_CAPACITANCE
,
178 .info_mask_separate
= BIT(IIO_CHAN_INFO_RAW
) |
179 BIT(IIO_CHAN_INFO_CALIBSCALE
) | BIT(IIO_CHAN_INFO_OFFSET
),
180 .info_mask_shared_by_type
= BIT(IIO_CHAN_INFO_CALIBBIAS
) |
181 BIT(IIO_CHAN_INFO_SCALE
),
182 .address
= AD7746_REG_CAP_DATA_HIGH
<< 8 |
183 AD7746_CAPSETUP_CAPDIFF
186 .type
= IIO_CAPACITANCE
,
189 .info_mask_separate
= BIT(IIO_CHAN_INFO_RAW
) |
190 BIT(IIO_CHAN_INFO_CALIBSCALE
) | BIT(IIO_CHAN_INFO_OFFSET
),
191 .info_mask_shared_by_type
= BIT(IIO_CHAN_INFO_CALIBBIAS
) |
192 BIT(IIO_CHAN_INFO_SCALE
),
193 .address
= AD7746_REG_CAP_DATA_HIGH
<< 8 |
194 AD7746_CAPSETUP_CIN2
,
197 .type
= IIO_CAPACITANCE
,
202 .info_mask_separate
= BIT(IIO_CHAN_INFO_RAW
) |
203 BIT(IIO_CHAN_INFO_CALIBSCALE
) | BIT(IIO_CHAN_INFO_OFFSET
),
204 .info_mask_shared_by_type
= BIT(IIO_CHAN_INFO_CALIBBIAS
) |
205 BIT(IIO_CHAN_INFO_SCALE
),
206 .address
= AD7746_REG_CAP_DATA_HIGH
<< 8 |
207 AD7746_CAPSETUP_CAPDIFF
| AD7746_CAPSETUP_CIN2
,
211 /* Values are Update Rate (Hz), Conversion Time (ms) + 1*/
212 static const unsigned char ad7746_vt_filter_rate_table
[][2] = {
213 {50, 20 + 1}, {31, 32 + 1}, {16, 62 + 1}, {8, 122 + 1},
216 static const unsigned char ad7746_cap_filter_rate_table
[][2] = {
217 {91, 11 + 1}, {84, 12 + 1}, {50, 20 + 1}, {26, 38 + 1},
218 {16, 62 + 1}, {13, 77 + 1}, {11, 92 + 1}, {9, 110 + 1},
221 static int ad7746_select_channel(struct iio_dev
*indio_dev
,
222 struct iio_chan_spec
const *chan
)
224 struct ad7746_chip_info
*chip
= iio_priv(indio_dev
);
226 u8 vt_setup
, cap_setup
;
228 switch (chan
->type
) {
229 case IIO_CAPACITANCE
:
230 cap_setup
= (chan
->address
& 0xFF) | AD7746_CAPSETUP_CAPEN
;
231 vt_setup
= chip
->vt_setup
& ~AD7746_VTSETUP_VTEN
;
232 delay
= ad7746_cap_filter_rate_table
[(chip
->config
>> 3) &
235 if (chip
->capdac_set
!= chan
->channel
) {
236 ret
= i2c_smbus_write_byte_data(chip
->client
,
238 chip
->capdac
[chan
->channel
][0]);
241 ret
= i2c_smbus_write_byte_data(chip
->client
,
243 chip
->capdac
[chan
->channel
][1]);
247 chip
->capdac_set
= chan
->channel
;
252 vt_setup
= (chan
->address
& 0xFF) | AD7746_VTSETUP_VTEN
;
253 cap_setup
= chip
->cap_setup
& ~AD7746_CAPSETUP_CAPEN
;
254 delay
= ad7746_cap_filter_rate_table
[(chip
->config
>> 6) &
261 if (chip
->cap_setup
!= cap_setup
) {
262 ret
= i2c_smbus_write_byte_data(chip
->client
,
263 AD7746_REG_CAP_SETUP
,
268 chip
->cap_setup
= cap_setup
;
271 if (chip
->vt_setup
!= vt_setup
) {
272 ret
= i2c_smbus_write_byte_data(chip
->client
,
278 chip
->vt_setup
= vt_setup
;
284 static inline ssize_t
ad7746_start_calib(struct device
*dev
,
285 struct device_attribute
*attr
,
290 struct iio_dev
*indio_dev
= dev_to_iio_dev(dev
);
291 struct ad7746_chip_info
*chip
= iio_priv(indio_dev
);
293 int ret
, timeout
= 10;
295 ret
= strtobool(buf
, &doit
);
302 mutex_lock(&indio_dev
->mlock
);
303 regval
|= chip
->config
;
304 ret
= i2c_smbus_write_byte_data(chip
->client
, AD7746_REG_CFG
, regval
);
306 mutex_unlock(&indio_dev
->mlock
);
312 ret
= i2c_smbus_read_byte_data(chip
->client
, AD7746_REG_CFG
);
314 mutex_unlock(&indio_dev
->mlock
);
317 } while ((ret
== regval
) && timeout
--);
319 mutex_unlock(&indio_dev
->mlock
);
324 static ssize_t
ad7746_start_offset_calib(struct device
*dev
,
325 struct device_attribute
*attr
,
329 struct iio_dev
*indio_dev
= dev_to_iio_dev(dev
);
330 int ret
= ad7746_select_channel(indio_dev
,
331 &ad7746_channels
[to_iio_dev_attr(attr
)->address
]);
335 return ad7746_start_calib(dev
, attr
, buf
, len
,
336 AD7746_CONF_MODE_OFFS_CAL
);
339 static ssize_t
ad7746_start_gain_calib(struct device
*dev
,
340 struct device_attribute
*attr
,
344 struct iio_dev
*indio_dev
= dev_to_iio_dev(dev
);
345 int ret
= ad7746_select_channel(indio_dev
,
346 &ad7746_channels
[to_iio_dev_attr(attr
)->address
]);
350 return ad7746_start_calib(dev
, attr
, buf
, len
,
351 AD7746_CONF_MODE_GAIN_CAL
);
354 static IIO_DEVICE_ATTR(in_capacitance0_calibbias_calibration
,
355 S_IWUSR
, NULL
, ad7746_start_offset_calib
, CIN1
);
356 static IIO_DEVICE_ATTR(in_capacitance1_calibbias_calibration
,
357 S_IWUSR
, NULL
, ad7746_start_offset_calib
, CIN2
);
358 static IIO_DEVICE_ATTR(in_capacitance0_calibscale_calibration
,
359 S_IWUSR
, NULL
, ad7746_start_gain_calib
, CIN1
);
360 static IIO_DEVICE_ATTR(in_capacitance1_calibscale_calibration
,
361 S_IWUSR
, NULL
, ad7746_start_gain_calib
, CIN2
);
362 static IIO_DEVICE_ATTR(in_voltage0_calibscale_calibration
,
363 S_IWUSR
, NULL
, ad7746_start_gain_calib
, VIN
);
365 static ssize_t
ad7746_show_cap_filter_rate_setup(struct device
*dev
,
366 struct device_attribute
*attr
,
369 struct iio_dev
*indio_dev
= dev_to_iio_dev(dev
);
370 struct ad7746_chip_info
*chip
= iio_priv(indio_dev
);
372 return sprintf(buf
, "%d\n", ad7746_cap_filter_rate_table
[
373 (chip
->config
>> 3) & 0x7][0]);
376 static ssize_t
ad7746_store_cap_filter_rate_setup(struct device
*dev
,
377 struct device_attribute
*attr
,
381 struct iio_dev
*indio_dev
= dev_to_iio_dev(dev
);
382 struct ad7746_chip_info
*chip
= iio_priv(indio_dev
);
386 ret
= kstrtou8(buf
, 10, &data
);
390 for (i
= 0; i
< ARRAY_SIZE(ad7746_cap_filter_rate_table
); i
++)
391 if (data
>= ad7746_cap_filter_rate_table
[i
][0])
394 if (i
>= ARRAY_SIZE(ad7746_cap_filter_rate_table
))
395 i
= ARRAY_SIZE(ad7746_cap_filter_rate_table
) - 1;
397 mutex_lock(&indio_dev
->mlock
);
398 chip
->config
&= ~AD7746_CONF_CAPFS(0x7);
399 chip
->config
|= AD7746_CONF_CAPFS(i
);
400 mutex_unlock(&indio_dev
->mlock
);
405 static ssize_t
ad7746_show_vt_filter_rate_setup(struct device
*dev
,
406 struct device_attribute
*attr
,
409 struct iio_dev
*indio_dev
= dev_to_iio_dev(dev
);
410 struct ad7746_chip_info
*chip
= iio_priv(indio_dev
);
412 return sprintf(buf
, "%d\n", ad7746_vt_filter_rate_table
[
413 (chip
->config
>> 6) & 0x3][0]);
416 static ssize_t
ad7746_store_vt_filter_rate_setup(struct device
*dev
,
417 struct device_attribute
*attr
,
421 struct iio_dev
*indio_dev
= dev_to_iio_dev(dev
);
422 struct ad7746_chip_info
*chip
= iio_priv(indio_dev
);
426 ret
= kstrtou8(buf
, 10, &data
);
430 for (i
= 0; i
< ARRAY_SIZE(ad7746_vt_filter_rate_table
); i
++)
431 if (data
>= ad7746_vt_filter_rate_table
[i
][0])
434 if (i
>= ARRAY_SIZE(ad7746_vt_filter_rate_table
))
435 i
= ARRAY_SIZE(ad7746_vt_filter_rate_table
) - 1;
437 mutex_lock(&indio_dev
->mlock
);
438 chip
->config
&= ~AD7746_CONF_VTFS(0x3);
439 chip
->config
|= AD7746_CONF_VTFS(i
);
440 mutex_unlock(&indio_dev
->mlock
);
445 static IIO_DEVICE_ATTR(in_capacitance_sampling_frequency
,
446 S_IRUGO
| S_IWUSR
, ad7746_show_cap_filter_rate_setup
,
447 ad7746_store_cap_filter_rate_setup
, 0);
449 static IIO_DEVICE_ATTR(in_voltage_sampling_frequency
,
450 S_IRUGO
| S_IWUSR
, ad7746_show_vt_filter_rate_setup
,
451 ad7746_store_vt_filter_rate_setup
, 0);
453 static IIO_CONST_ATTR(in_voltage_sampling_frequency_available
, "50 31 16 8");
454 static IIO_CONST_ATTR(in_capacitance_sampling_frequency_available
,
455 "91 84 50 26 16 13 11 9");
457 static struct attribute
*ad7746_attributes
[] = {
458 &iio_dev_attr_in_capacitance_sampling_frequency
.dev_attr
.attr
,
459 &iio_dev_attr_in_voltage_sampling_frequency
.dev_attr
.attr
,
460 &iio_dev_attr_in_capacitance0_calibbias_calibration
.dev_attr
.attr
,
461 &iio_dev_attr_in_capacitance0_calibscale_calibration
.dev_attr
.attr
,
462 &iio_dev_attr_in_capacitance1_calibscale_calibration
.dev_attr
.attr
,
463 &iio_dev_attr_in_capacitance1_calibbias_calibration
.dev_attr
.attr
,
464 &iio_dev_attr_in_voltage0_calibscale_calibration
.dev_attr
.attr
,
465 &iio_const_attr_in_voltage_sampling_frequency_available
.dev_attr
.attr
,
466 &iio_const_attr_in_capacitance_sampling_frequency_available
.
471 static const struct attribute_group ad7746_attribute_group
= {
472 .attrs
= ad7746_attributes
,
475 static int ad7746_write_raw(struct iio_dev
*indio_dev
,
476 struct iio_chan_spec
const *chan
,
481 struct ad7746_chip_info
*chip
= iio_priv(indio_dev
);
484 mutex_lock(&indio_dev
->mlock
);
487 case IIO_CHAN_INFO_CALIBSCALE
:
493 val
= (val2
* 1024) / 15625;
495 switch (chan
->type
) {
496 case IIO_CAPACITANCE
:
497 reg
= AD7746_REG_CAP_GAINH
;
500 reg
= AD7746_REG_VOLT_GAINH
;
507 ret
= i2c_smbus_write_word_data(chip
->client
, reg
, swab16(val
));
513 case IIO_CHAN_INFO_CALIBBIAS
:
514 if ((val
< 0) | (val
> 0xFFFF)) {
518 ret
= i2c_smbus_write_word_data(chip
->client
,
519 AD7746_REG_CAP_OFFH
, swab16(val
));
525 case IIO_CHAN_INFO_OFFSET
:
526 if ((val
< 0) | (val
> 43008000)) { /* 21pF */
531 /* CAPDAC Scale = 21pF_typ / 127
532 * CIN Scale = 8.192pF / 2^24
533 * Offset Scale = CAPDAC Scale / CIN Scale = 338646
538 chip
->capdac
[chan
->channel
][chan
->differential
] = (val
> 0 ?
539 AD7746_CAPDAC_DACP(val
) | AD7746_CAPDAC_DACEN
: 0);
541 ret
= i2c_smbus_write_byte_data(chip
->client
,
543 chip
->capdac
[chan
->channel
][0]);
546 ret
= i2c_smbus_write_byte_data(chip
->client
,
548 chip
->capdac
[chan
->channel
][1]);
552 chip
->capdac_set
= chan
->channel
;
561 mutex_unlock(&indio_dev
->mlock
);
565 static int ad7746_read_raw(struct iio_dev
*indio_dev
,
566 struct iio_chan_spec
const *chan
,
570 struct ad7746_chip_info
*chip
= iio_priv(indio_dev
);
574 mutex_lock(&indio_dev
->mlock
);
577 case IIO_CHAN_INFO_RAW
:
578 case IIO_CHAN_INFO_PROCESSED
:
579 ret
= ad7746_select_channel(indio_dev
, chan
);
584 regval
= chip
->config
| AD7746_CONF_MODE_SINGLE_CONV
;
585 ret
= i2c_smbus_write_byte_data(chip
->client
, AD7746_REG_CFG
,
591 /* Now read the actual register */
593 ret
= i2c_smbus_read_i2c_block_data(chip
->client
,
594 chan
->address
>> 8, 3, &chip
->data
.d8
[1]);
599 *val
= (be32_to_cpu(chip
->data
.d32
) & 0xFFFFFF) - 0x800000;
601 switch (chan
->type
) {
603 /* temperature in milli degrees Celsius
604 * T = ((*val / 2048) - 4096) * 1000
606 *val
= (*val
* 125) / 256;
609 if (chan
->channel
== 1) /* supply_raw*/
618 case IIO_CHAN_INFO_CALIBSCALE
:
619 switch (chan
->type
) {
620 case IIO_CAPACITANCE
:
621 reg
= AD7746_REG_CAP_GAINH
;
624 reg
= AD7746_REG_VOLT_GAINH
;
631 ret
= i2c_smbus_read_word_data(chip
->client
, reg
);
634 /* 1 + gain_val / 2^16 */
636 *val2
= (15625 * swab16(ret
)) / 1024;
638 ret
= IIO_VAL_INT_PLUS_MICRO
;
640 case IIO_CHAN_INFO_CALIBBIAS
:
641 ret
= i2c_smbus_read_word_data(chip
->client
,
642 AD7746_REG_CAP_OFFH
);
649 case IIO_CHAN_INFO_OFFSET
:
650 *val
= AD7746_CAPDAC_DACP(chip
->capdac
[chan
->channel
]
651 [chan
->differential
]) * 338646;
655 case IIO_CHAN_INFO_SCALE
:
656 switch (chan
->type
) {
657 case IIO_CAPACITANCE
:
661 ret
= IIO_VAL_INT_PLUS_NANO
;
667 ret
= IIO_VAL_FRACTIONAL_LOG2
;
679 mutex_unlock(&indio_dev
->mlock
);
683 static const struct iio_info ad7746_info
= {
684 .attrs
= &ad7746_attribute_group
,
685 .read_raw
= &ad7746_read_raw
,
686 .write_raw
= &ad7746_write_raw
,
687 .driver_module
= THIS_MODULE
,
691 * device probe and remove
694 static int ad7746_probe(struct i2c_client
*client
,
695 const struct i2c_device_id
*id
)
697 struct ad7746_platform_data
*pdata
= client
->dev
.platform_data
;
698 struct ad7746_chip_info
*chip
;
699 struct iio_dev
*indio_dev
;
701 unsigned char regval
= 0;
703 indio_dev
= devm_iio_device_alloc(&client
->dev
, sizeof(*chip
));
706 chip
= iio_priv(indio_dev
);
707 /* this is only used for device removal purposes */
708 i2c_set_clientdata(client
, indio_dev
);
710 chip
->client
= client
;
711 chip
->capdac_set
= -1;
713 /* Establish that the iio_dev is a child of the i2c device */
714 indio_dev
->name
= id
->name
;
715 indio_dev
->dev
.parent
= &client
->dev
;
716 indio_dev
->info
= &ad7746_info
;
717 indio_dev
->channels
= ad7746_channels
;
718 if (id
->driver_data
== 7746)
719 indio_dev
->num_channels
= ARRAY_SIZE(ad7746_channels
);
721 indio_dev
->num_channels
= ARRAY_SIZE(ad7746_channels
) - 2;
722 indio_dev
->num_channels
= ARRAY_SIZE(ad7746_channels
);
723 indio_dev
->modes
= INDIO_DIRECT_MODE
;
726 if (pdata
->exca_en
) {
727 if (pdata
->exca_inv_en
)
728 regval
|= AD7746_EXCSETUP_NEXCA
;
730 regval
|= AD7746_EXCSETUP_EXCA
;
733 if (pdata
->excb_en
) {
734 if (pdata
->excb_inv_en
)
735 regval
|= AD7746_EXCSETUP_NEXCB
;
737 regval
|= AD7746_EXCSETUP_EXCB
;
740 regval
|= AD7746_EXCSETUP_EXCLVL(pdata
->exclvl
);
742 dev_warn(&client
->dev
, "No platform data? using default\n");
743 regval
= AD7746_EXCSETUP_EXCA
| AD7746_EXCSETUP_EXCB
|
744 AD7746_EXCSETUP_EXCLVL(3);
747 ret
= i2c_smbus_write_byte_data(chip
->client
,
748 AD7746_REG_EXC_SETUP
, regval
);
752 ret
= iio_device_register(indio_dev
);
756 dev_info(&client
->dev
, "%s capacitive sensor registered\n", id
->name
);
761 static int ad7746_remove(struct i2c_client
*client
)
763 struct iio_dev
*indio_dev
= i2c_get_clientdata(client
);
765 iio_device_unregister(indio_dev
);
770 static const struct i2c_device_id ad7746_id
[] = {
777 MODULE_DEVICE_TABLE(i2c
, ad7746_id
);
779 static struct i2c_driver ad7746_driver
= {
781 .name
= KBUILD_MODNAME
,
783 .probe
= ad7746_probe
,
784 .remove
= ad7746_remove
,
785 .id_table
= ad7746_id
,
787 module_i2c_driver(ad7746_driver
);
789 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
790 MODULE_DESCRIPTION("Analog Devices AD7746/5/7 capacitive sensor driver");
791 MODULE_LICENSE("GPL v2");