1 // SPDX-License-Identifier: GPL-2.0-only
3 * si1145.c - Support for Silabs SI1132 and SI1141/2/3/5/6/7 combined ambient
4 * light, UV index and proximity sensors
6 * Copyright 2014-16 Peter Meerwald-Stadler <pmeerw@pmeerw.net>
7 * Copyright 2016 Crestez Dan Leonard <leonard.crestez@intel.com>
9 * SI1132 (7-bit I2C slave address 0x60)
10 * SI1141/2/3 (7-bit I2C slave address 0x5a)
11 * SI1145/6/6 (7-bit I2C slave address 0x60)
14 #include <linux/module.h>
15 #include <linux/i2c.h>
16 #include <linux/err.h>
17 #include <linux/slab.h>
18 #include <linux/delay.h>
19 #include <linux/irq.h>
21 #include <linux/iio/iio.h>
22 #include <linux/iio/sysfs.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/buffer.h>
27 #include <linux/util_macros.h>
29 #define SI1145_REG_PART_ID 0x00
30 #define SI1145_REG_REV_ID 0x01
31 #define SI1145_REG_SEQ_ID 0x02
32 #define SI1145_REG_INT_CFG 0x03
33 #define SI1145_REG_IRQ_ENABLE 0x04
34 #define SI1145_REG_IRQ_MODE 0x05
35 #define SI1145_REG_HW_KEY 0x07
36 #define SI1145_REG_MEAS_RATE 0x08
37 #define SI1145_REG_PS_LED21 0x0f
38 #define SI1145_REG_PS_LED3 0x10
39 #define SI1145_REG_UCOEF1 0x13
40 #define SI1145_REG_UCOEF2 0x14
41 #define SI1145_REG_UCOEF3 0x15
42 #define SI1145_REG_UCOEF4 0x16
43 #define SI1145_REG_PARAM_WR 0x17
44 #define SI1145_REG_COMMAND 0x18
45 #define SI1145_REG_RESPONSE 0x20
46 #define SI1145_REG_IRQ_STATUS 0x21
47 #define SI1145_REG_ALSVIS_DATA 0x22
48 #define SI1145_REG_ALSIR_DATA 0x24
49 #define SI1145_REG_PS1_DATA 0x26
50 #define SI1145_REG_PS2_DATA 0x28
51 #define SI1145_REG_PS3_DATA 0x2a
52 #define SI1145_REG_AUX_DATA 0x2c
53 #define SI1145_REG_PARAM_RD 0x2e
54 #define SI1145_REG_CHIP_STAT 0x30
56 #define SI1145_UCOEF1_DEFAULT 0x7b
57 #define SI1145_UCOEF2_DEFAULT 0x6b
58 #define SI1145_UCOEF3_DEFAULT 0x01
59 #define SI1145_UCOEF4_DEFAULT 0x00
61 /* Helper to figure out PS_LED register / shift per channel */
62 #define SI1145_PS_LED_REG(ch) \
63 (((ch) == 2) ? SI1145_REG_PS_LED3 : SI1145_REG_PS_LED21)
64 #define SI1145_PS_LED_SHIFT(ch) \
67 /* Parameter offsets */
68 #define SI1145_PARAM_CHLIST 0x01
69 #define SI1145_PARAM_PSLED12_SELECT 0x02
70 #define SI1145_PARAM_PSLED3_SELECT 0x03
71 #define SI1145_PARAM_PS_ENCODING 0x05
72 #define SI1145_PARAM_ALS_ENCODING 0x06
73 #define SI1145_PARAM_PS1_ADC_MUX 0x07
74 #define SI1145_PARAM_PS2_ADC_MUX 0x08
75 #define SI1145_PARAM_PS3_ADC_MUX 0x09
76 #define SI1145_PARAM_PS_ADC_COUNTER 0x0a
77 #define SI1145_PARAM_PS_ADC_GAIN 0x0b
78 #define SI1145_PARAM_PS_ADC_MISC 0x0c
79 #define SI1145_PARAM_ALS_ADC_MUX 0x0d
80 #define SI1145_PARAM_ALSIR_ADC_MUX 0x0e
81 #define SI1145_PARAM_AUX_ADC_MUX 0x0f
82 #define SI1145_PARAM_ALSVIS_ADC_COUNTER 0x10
83 #define SI1145_PARAM_ALSVIS_ADC_GAIN 0x11
84 #define SI1145_PARAM_ALSVIS_ADC_MISC 0x12
85 #define SI1145_PARAM_LED_RECOVERY 0x1c
86 #define SI1145_PARAM_ALSIR_ADC_COUNTER 0x1d
87 #define SI1145_PARAM_ALSIR_ADC_GAIN 0x1e
88 #define SI1145_PARAM_ALSIR_ADC_MISC 0x1f
89 #define SI1145_PARAM_ADC_OFFSET 0x1a
91 /* Channel enable masks for CHLIST parameter */
92 #define SI1145_CHLIST_EN_PS1 BIT(0)
93 #define SI1145_CHLIST_EN_PS2 BIT(1)
94 #define SI1145_CHLIST_EN_PS3 BIT(2)
95 #define SI1145_CHLIST_EN_ALSVIS BIT(4)
96 #define SI1145_CHLIST_EN_ALSIR BIT(5)
97 #define SI1145_CHLIST_EN_AUX BIT(6)
98 #define SI1145_CHLIST_EN_UV BIT(7)
100 /* Proximity measurement mode for ADC_MISC parameter */
101 #define SI1145_PS_ADC_MODE_NORMAL BIT(2)
102 /* Signal range mask for ADC_MISC parameter */
103 #define SI1145_ADC_MISC_RANGE BIT(5)
105 /* Commands for REG_COMMAND */
106 #define SI1145_CMD_NOP 0x00
107 #define SI1145_CMD_RESET 0x01
108 #define SI1145_CMD_PS_FORCE 0x05
109 #define SI1145_CMD_ALS_FORCE 0x06
110 #define SI1145_CMD_PSALS_FORCE 0x07
111 #define SI1145_CMD_PS_PAUSE 0x09
112 #define SI1145_CMD_ALS_PAUSE 0x0a
113 #define SI1145_CMD_PSALS_PAUSE 0x0b
114 #define SI1145_CMD_PS_AUTO 0x0d
115 #define SI1145_CMD_ALS_AUTO 0x0e
116 #define SI1145_CMD_PSALS_AUTO 0x0f
117 #define SI1145_CMD_PARAM_QUERY 0x80
118 #define SI1145_CMD_PARAM_SET 0xa0
120 #define SI1145_RSP_INVALID_SETTING 0x80
121 #define SI1145_RSP_COUNTER_MASK 0x0F
123 /* Minimum sleep after each command to ensure it's received */
124 #define SI1145_COMMAND_MINSLEEP_MS 5
125 /* Return -ETIMEDOUT after this long */
126 #define SI1145_COMMAND_TIMEOUT_MS 25
128 /* Interrupt configuration masks for INT_CFG register */
129 #define SI1145_INT_CFG_OE BIT(0) /* enable interrupt */
130 #define SI1145_INT_CFG_MODE BIT(1) /* auto reset interrupt pin */
132 /* Interrupt enable masks for IRQ_ENABLE register */
133 #define SI1145_MASK_ALL_IE (BIT(4) | BIT(3) | BIT(2) | BIT(0))
135 #define SI1145_MUX_TEMP 0x65
136 #define SI1145_MUX_VDD 0x75
138 /* Proximity LED current; see Table 2 in datasheet */
139 #define SI1145_LED_CURRENT_45mA 0x04
151 struct si1145_part_info {
153 const struct iio_info *iio_info;
154 const struct iio_chan_spec *channels;
155 unsigned int num_channels;
156 unsigned int num_leds;
157 bool uncompressed_meas_rate;
161 * struct si1145_data - si1145 chip state data
162 * @client: I2C client
163 * @lock: mutex to protect shared state.
164 * @cmdlock: Low-level mutex to protect command execution only
165 * @rsp_seq: Next expected response number or -1 if counter reset required
166 * @scan_mask: Saved scan mask to avoid duplicate set_chlist
167 * @autonomous: If automatic measurements are active (for buffer support)
168 * @part_info: Part information
169 * @trig: Pointer to iio trigger
170 * @meas_rate: Value of MEAS_RATE register. Only set in HW in auto mode
171 * @buffer: Used to pack data read from sensor.
174 struct i2c_client *client;
176 struct mutex cmdlock;
178 const struct si1145_part_info *part_info;
179 unsigned long scan_mask;
181 struct iio_trigger *trig;
184 * Ensure timestamp will be naturally aligned if present.
185 * Maximum buffer size (may be only partly used if not all
186 * channels are enabled):
187 * 6*2 bytes channels data + 4 bytes alignment +
190 u8 buffer[24] __aligned(8);
194 * __si1145_command_reset() - Send CMD_NOP and wait for response 0
196 * Does not modify data->rsp_seq
198 * Return: 0 on success and -errno on error.
200 static int __si1145_command_reset(struct si1145_data *data)
202 struct device *dev = &data->client->dev;
203 unsigned long stop_jiffies;
206 ret = i2c_smbus_write_byte_data(data->client, SI1145_REG_COMMAND,
210 msleep(SI1145_COMMAND_MINSLEEP_MS);
212 stop_jiffies = jiffies + SI1145_COMMAND_TIMEOUT_MS * HZ / 1000;
214 ret = i2c_smbus_read_byte_data(data->client,
215 SI1145_REG_RESPONSE);
218 if (time_after(jiffies, stop_jiffies)) {
219 dev_warn(dev, "timeout on reset\n");
222 msleep(SI1145_COMMAND_MINSLEEP_MS);
228 * si1145_command() - Execute a command and poll the response register
230 * All conversion overflows are reported as -EOVERFLOW
231 * INVALID_SETTING is reported as -EINVAL
232 * Timeouts are reported as -ETIMEDOUT
234 * Return: 0 on success or -errno on failure
236 static int si1145_command(struct si1145_data *data, u8 cmd)
238 struct device *dev = &data->client->dev;
239 unsigned long stop_jiffies;
242 mutex_lock(&data->cmdlock);
244 if (data->rsp_seq < 0) {
245 ret = __si1145_command_reset(data);
247 dev_err(dev, "failed to reset command counter, ret=%d\n",
254 ret = i2c_smbus_write_byte_data(data->client, SI1145_REG_COMMAND, cmd);
256 dev_warn(dev, "failed to write command, ret=%d\n", ret);
259 /* Sleep a little to ensure the command is received */
260 msleep(SI1145_COMMAND_MINSLEEP_MS);
262 stop_jiffies = jiffies + SI1145_COMMAND_TIMEOUT_MS * HZ / 1000;
264 ret = i2c_smbus_read_byte_data(data->client,
265 SI1145_REG_RESPONSE);
267 dev_warn(dev, "failed to read response, ret=%d\n", ret);
271 if ((ret & ~SI1145_RSP_COUNTER_MASK) == 0) {
272 if (ret == data->rsp_seq) {
273 if (time_after(jiffies, stop_jiffies)) {
274 dev_warn(dev, "timeout on command %#02hhx\n",
279 msleep(SI1145_COMMAND_MINSLEEP_MS);
282 if (ret == ((data->rsp_seq + 1) &
283 SI1145_RSP_COUNTER_MASK)) {
288 dev_warn(dev, "unexpected response counter %d instead of %d\n",
289 ret, (data->rsp_seq + 1) &
290 SI1145_RSP_COUNTER_MASK);
293 if (ret == SI1145_RSP_INVALID_SETTING) {
294 dev_warn(dev, "INVALID_SETTING error on command %#02hhx\n",
298 /* All overflows are treated identically */
299 dev_dbg(dev, "overflow, ret=%d, cmd=%#02hhx\n",
305 /* Force a counter reset next time */
311 mutex_unlock(&data->cmdlock);
316 static int si1145_param_update(struct si1145_data *data, u8 op, u8 param,
321 ret = i2c_smbus_write_byte_data(data->client,
322 SI1145_REG_PARAM_WR, value);
326 return si1145_command(data, op | (param & 0x1F));
329 static int si1145_param_set(struct si1145_data *data, u8 param, u8 value)
331 return si1145_param_update(data, SI1145_CMD_PARAM_SET, param, value);
334 /* Set param. Returns negative errno or current value */
335 static int si1145_param_query(struct si1145_data *data, u8 param)
339 ret = si1145_command(data, SI1145_CMD_PARAM_QUERY | (param & 0x1F));
343 return i2c_smbus_read_byte_data(data->client, SI1145_REG_PARAM_RD);
346 /* Expand 8 bit compressed value to 16 bit, see Silabs AN498 */
347 static u16 si1145_uncompress(u8 x)
355 exponent = (x & 0xf0) >> 4;
356 result = 0x10 | (x & 0x0f);
359 return result << (exponent - 4);
360 return result >> (4 - exponent);
363 /* Compress 16 bit value to 8 bit, see Silabs AN498 */
364 static u8 si1145_compress(u16 x)
383 significand = x << (4 - exponent);
384 return (exponent << 4) | (significand & 0xF);
387 significand = x >> (exponent - 5);
388 if (significand & 1) {
390 if (significand & 0x0040) {
396 return (exponent << 4) | ((significand >> 1) & 0xF);
399 /* Write meas_rate in hardware */
400 static int si1145_set_meas_rate(struct si1145_data *data, int interval)
402 if (data->part_info->uncompressed_meas_rate)
403 return i2c_smbus_write_word_data(data->client,
404 SI1145_REG_MEAS_RATE, interval);
406 return i2c_smbus_write_byte_data(data->client,
407 SI1145_REG_MEAS_RATE, interval);
410 static int si1145_read_samp_freq(struct si1145_data *data, int *val, int *val2)
413 if (data->part_info->uncompressed_meas_rate)
414 *val2 = data->meas_rate;
416 *val2 = si1145_uncompress(data->meas_rate);
417 return IIO_VAL_FRACTIONAL;
420 /* Set the samp freq in driver private data */
421 static int si1145_store_samp_freq(struct si1145_data *data, int val)
426 if (val <= 0 || val > 32000)
428 meas_rate = 32000 / val;
430 mutex_lock(&data->lock);
431 if (data->autonomous) {
432 ret = si1145_set_meas_rate(data, meas_rate);
436 if (data->part_info->uncompressed_meas_rate)
437 data->meas_rate = meas_rate;
439 data->meas_rate = si1145_compress(meas_rate);
442 mutex_unlock(&data->lock);
447 static irqreturn_t si1145_trigger_handler(int irq, void *private)
449 struct iio_poll_func *pf = private;
450 struct iio_dev *indio_dev = pf->indio_dev;
451 struct si1145_data *data = iio_priv(indio_dev);
456 if (!data->autonomous) {
457 ret = si1145_command(data, SI1145_CMD_PSALS_FORCE);
458 if (ret < 0 && ret != -EOVERFLOW)
461 irq_status = ret = i2c_smbus_read_byte_data(data->client,
462 SI1145_REG_IRQ_STATUS);
465 if (!(irq_status & SI1145_MASK_ALL_IE))
469 for_each_set_bit(i, indio_dev->active_scan_mask,
470 indio_dev->masklength) {
473 while (i + run < indio_dev->masklength) {
474 if (!test_bit(i + run, indio_dev->active_scan_mask))
476 if (indio_dev->channels[i + run].address !=
477 indio_dev->channels[i].address + 2 * run)
482 ret = i2c_smbus_read_i2c_block_data_or_emulated(
483 data->client, indio_dev->channels[i].address,
484 sizeof(u16) * run, &data->buffer[j]);
487 j += run * sizeof(u16);
491 if (data->autonomous) {
492 ret = i2c_smbus_write_byte_data(data->client,
493 SI1145_REG_IRQ_STATUS,
494 irq_status & SI1145_MASK_ALL_IE);
499 iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
500 iio_get_time_ns(indio_dev));
503 iio_trigger_notify_done(indio_dev->trig);
507 static int si1145_set_chlist(struct iio_dev *indio_dev, unsigned long scan_mask)
509 struct si1145_data *data = iio_priv(indio_dev);
514 /* channel list already set, no need to reprogram */
515 if (data->scan_mask == scan_mask)
518 for_each_set_bit(i, &scan_mask, indio_dev->masklength) {
519 switch (indio_dev->channels[i].address) {
520 case SI1145_REG_ALSVIS_DATA:
521 reg |= SI1145_CHLIST_EN_ALSVIS;
523 case SI1145_REG_ALSIR_DATA:
524 reg |= SI1145_CHLIST_EN_ALSIR;
526 case SI1145_REG_PS1_DATA:
527 reg |= SI1145_CHLIST_EN_PS1;
529 case SI1145_REG_PS2_DATA:
530 reg |= SI1145_CHLIST_EN_PS2;
532 case SI1145_REG_PS3_DATA:
533 reg |= SI1145_CHLIST_EN_PS3;
535 case SI1145_REG_AUX_DATA:
536 switch (indio_dev->channels[i].type) {
538 reg |= SI1145_CHLIST_EN_UV;
541 reg |= SI1145_CHLIST_EN_AUX;
542 if (indio_dev->channels[i].type == IIO_TEMP)
543 mux = SI1145_MUX_TEMP;
545 mux = SI1145_MUX_VDD;
546 ret = si1145_param_set(data,
547 SI1145_PARAM_AUX_ADC_MUX, mux);
556 data->scan_mask = scan_mask;
557 ret = si1145_param_set(data, SI1145_PARAM_CHLIST, reg);
559 return ret < 0 ? ret : 0;
562 static int si1145_measure(struct iio_dev *indio_dev,
563 struct iio_chan_spec const *chan)
565 struct si1145_data *data = iio_priv(indio_dev);
569 ret = si1145_set_chlist(indio_dev, BIT(chan->scan_index));
573 cmd = (chan->type == IIO_PROXIMITY) ? SI1145_CMD_PS_FORCE :
574 SI1145_CMD_ALS_FORCE;
575 ret = si1145_command(data, cmd);
576 if (ret < 0 && ret != -EOVERFLOW)
579 return i2c_smbus_read_word_data(data->client, chan->address);
583 * Conversion between iio scale and ADC_GAIN values
584 * These could be further adjusted but proximity/intensity are dimensionless
586 static const int si1145_proximity_scale_available[] = {
587 128, 64, 32, 16, 8, 4};
588 static const int si1145_intensity_scale_available[] = {
589 128, 64, 32, 16, 8, 4, 2, 1};
590 static IIO_CONST_ATTR(in_proximity_scale_available,
592 static IIO_CONST_ATTR(in_intensity_scale_available,
593 "128 64 32 16 8 4 2 1");
594 static IIO_CONST_ATTR(in_intensity_ir_scale_available,
595 "128 64 32 16 8 4 2 1");
597 static int si1145_scale_from_adcgain(int regval)
599 return 128 >> regval;
602 static int si1145_proximity_adcgain_from_scale(int val, int val2)
604 val = find_closest_descending(val, si1145_proximity_scale_available,
605 ARRAY_SIZE(si1145_proximity_scale_available));
606 if (val < 0 || val > 5 || val2 != 0)
612 static int si1145_intensity_adcgain_from_scale(int val, int val2)
614 val = find_closest_descending(val, si1145_intensity_scale_available,
615 ARRAY_SIZE(si1145_intensity_scale_available));
616 if (val < 0 || val > 7 || val2 != 0)
622 static int si1145_read_raw(struct iio_dev *indio_dev,
623 struct iio_chan_spec const *chan,
624 int *val, int *val2, long mask)
626 struct si1145_data *data = iio_priv(indio_dev);
631 case IIO_CHAN_INFO_RAW:
632 switch (chan->type) {
638 ret = iio_device_claim_direct_mode(indio_dev);
641 ret = si1145_measure(indio_dev, chan);
642 iio_device_release_direct_mode(indio_dev);
651 ret = i2c_smbus_read_byte_data(data->client,
652 SI1145_PS_LED_REG(chan->channel));
656 *val = (ret >> SI1145_PS_LED_SHIFT(chan->channel))
663 case IIO_CHAN_INFO_SCALE:
664 switch (chan->type) {
666 reg = SI1145_PARAM_PS_ADC_GAIN;
669 if (chan->channel2 == IIO_MOD_LIGHT_IR)
670 reg = SI1145_PARAM_ALSIR_ADC_GAIN;
672 reg = SI1145_PARAM_ALSVIS_ADC_GAIN;
677 return IIO_VAL_INT_PLUS_MICRO;
681 return IIO_VAL_INT_PLUS_MICRO;
686 ret = si1145_param_query(data, reg);
690 *val = si1145_scale_from_adcgain(ret & 0x07);
693 case IIO_CHAN_INFO_OFFSET:
694 switch (chan->type) {
697 * -ADC offset - ADC counts @ 25°C -
698 * 35 * ADC counts / °C
700 *val = -256 - 11136 + 25 * 35;
704 * All ADC measurements have are by default offset
708 ret = si1145_param_query(data, SI1145_PARAM_ADC_OFFSET);
711 *val = -si1145_uncompress(ret);
714 case IIO_CHAN_INFO_SAMP_FREQ:
715 return si1145_read_samp_freq(data, val, val2);
721 static int si1145_write_raw(struct iio_dev *indio_dev,
722 struct iio_chan_spec const *chan,
723 int val, int val2, long mask)
725 struct si1145_data *data = iio_priv(indio_dev);
726 u8 reg1, reg2, shift;
730 case IIO_CHAN_INFO_SCALE:
731 switch (chan->type) {
733 val = si1145_proximity_adcgain_from_scale(val, val2);
736 reg1 = SI1145_PARAM_PS_ADC_GAIN;
737 reg2 = SI1145_PARAM_PS_ADC_COUNTER;
740 val = si1145_intensity_adcgain_from_scale(val, val2);
743 if (chan->channel2 == IIO_MOD_LIGHT_IR) {
744 reg1 = SI1145_PARAM_ALSIR_ADC_GAIN;
745 reg2 = SI1145_PARAM_ALSIR_ADC_COUNTER;
747 reg1 = SI1145_PARAM_ALSVIS_ADC_GAIN;
748 reg2 = SI1145_PARAM_ALSVIS_ADC_COUNTER;
755 ret = iio_device_claim_direct_mode(indio_dev);
759 ret = si1145_param_set(data, reg1, val);
761 iio_device_release_direct_mode(indio_dev);
764 /* Set recovery period to one's complement of gain */
765 ret = si1145_param_set(data, reg2, (~val & 0x07) << 4);
766 iio_device_release_direct_mode(indio_dev);
768 case IIO_CHAN_INFO_RAW:
769 if (chan->type != IIO_CURRENT)
772 if (val < 0 || val > 15 || val2 != 0)
775 reg1 = SI1145_PS_LED_REG(chan->channel);
776 shift = SI1145_PS_LED_SHIFT(chan->channel);
778 ret = iio_device_claim_direct_mode(indio_dev);
782 ret = i2c_smbus_read_byte_data(data->client, reg1);
784 iio_device_release_direct_mode(indio_dev);
787 ret = i2c_smbus_write_byte_data(data->client, reg1,
788 (ret & ~(0x0f << shift)) |
789 ((val & 0x0f) << shift));
790 iio_device_release_direct_mode(indio_dev);
792 case IIO_CHAN_INFO_SAMP_FREQ:
793 return si1145_store_samp_freq(data, val);
799 #define SI1145_ST { \
803 .endianness = IIO_LE, \
806 #define SI1145_INTENSITY_CHANNEL(_si) { \
807 .type = IIO_INTENSITY, \
808 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
809 BIT(IIO_CHAN_INFO_OFFSET) | \
810 BIT(IIO_CHAN_INFO_SCALE), \
811 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
812 .scan_type = SI1145_ST, \
814 .address = SI1145_REG_ALSVIS_DATA, \
817 #define SI1145_INTENSITY_IR_CHANNEL(_si) { \
818 .type = IIO_INTENSITY, \
819 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
820 BIT(IIO_CHAN_INFO_OFFSET) | \
821 BIT(IIO_CHAN_INFO_SCALE), \
822 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
824 .channel2 = IIO_MOD_LIGHT_IR, \
825 .scan_type = SI1145_ST, \
827 .address = SI1145_REG_ALSIR_DATA, \
830 #define SI1145_TEMP_CHANNEL(_si) { \
832 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
833 BIT(IIO_CHAN_INFO_OFFSET) | \
834 BIT(IIO_CHAN_INFO_SCALE), \
835 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
836 .scan_type = SI1145_ST, \
838 .address = SI1145_REG_AUX_DATA, \
841 #define SI1145_UV_CHANNEL(_si) { \
842 .type = IIO_UVINDEX, \
843 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
844 BIT(IIO_CHAN_INFO_SCALE), \
845 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
846 .scan_type = SI1145_ST, \
848 .address = SI1145_REG_AUX_DATA, \
851 #define SI1145_PROXIMITY_CHANNEL(_si, _ch) { \
852 .type = IIO_PROXIMITY, \
855 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
856 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
857 BIT(IIO_CHAN_INFO_OFFSET), \
858 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
859 .scan_type = SI1145_ST, \
861 .address = SI1145_REG_PS1_DATA + _ch * 2, \
864 #define SI1145_VOLTAGE_CHANNEL(_si) { \
865 .type = IIO_VOLTAGE, \
866 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
867 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
868 .scan_type = SI1145_ST, \
870 .address = SI1145_REG_AUX_DATA, \
873 #define SI1145_CURRENT_CHANNEL(_ch) { \
874 .type = IIO_CURRENT, \
879 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
882 static const struct iio_chan_spec si1132_channels[] = {
883 SI1145_INTENSITY_CHANNEL(0),
884 SI1145_INTENSITY_IR_CHANNEL(1),
885 SI1145_TEMP_CHANNEL(2),
886 SI1145_VOLTAGE_CHANNEL(3),
887 SI1145_UV_CHANNEL(4),
888 IIO_CHAN_SOFT_TIMESTAMP(6),
891 static const struct iio_chan_spec si1141_channels[] = {
892 SI1145_INTENSITY_CHANNEL(0),
893 SI1145_INTENSITY_IR_CHANNEL(1),
894 SI1145_PROXIMITY_CHANNEL(2, 0),
895 SI1145_TEMP_CHANNEL(3),
896 SI1145_VOLTAGE_CHANNEL(4),
897 IIO_CHAN_SOFT_TIMESTAMP(5),
898 SI1145_CURRENT_CHANNEL(0),
901 static const struct iio_chan_spec si1142_channels[] = {
902 SI1145_INTENSITY_CHANNEL(0),
903 SI1145_INTENSITY_IR_CHANNEL(1),
904 SI1145_PROXIMITY_CHANNEL(2, 0),
905 SI1145_PROXIMITY_CHANNEL(3, 1),
906 SI1145_TEMP_CHANNEL(4),
907 SI1145_VOLTAGE_CHANNEL(5),
908 IIO_CHAN_SOFT_TIMESTAMP(6),
909 SI1145_CURRENT_CHANNEL(0),
910 SI1145_CURRENT_CHANNEL(1),
913 static const struct iio_chan_spec si1143_channels[] = {
914 SI1145_INTENSITY_CHANNEL(0),
915 SI1145_INTENSITY_IR_CHANNEL(1),
916 SI1145_PROXIMITY_CHANNEL(2, 0),
917 SI1145_PROXIMITY_CHANNEL(3, 1),
918 SI1145_PROXIMITY_CHANNEL(4, 2),
919 SI1145_TEMP_CHANNEL(5),
920 SI1145_VOLTAGE_CHANNEL(6),
921 IIO_CHAN_SOFT_TIMESTAMP(7),
922 SI1145_CURRENT_CHANNEL(0),
923 SI1145_CURRENT_CHANNEL(1),
924 SI1145_CURRENT_CHANNEL(2),
927 static const struct iio_chan_spec si1145_channels[] = {
928 SI1145_INTENSITY_CHANNEL(0),
929 SI1145_INTENSITY_IR_CHANNEL(1),
930 SI1145_PROXIMITY_CHANNEL(2, 0),
931 SI1145_TEMP_CHANNEL(3),
932 SI1145_VOLTAGE_CHANNEL(4),
933 SI1145_UV_CHANNEL(5),
934 IIO_CHAN_SOFT_TIMESTAMP(6),
935 SI1145_CURRENT_CHANNEL(0),
938 static const struct iio_chan_spec si1146_channels[] = {
939 SI1145_INTENSITY_CHANNEL(0),
940 SI1145_INTENSITY_IR_CHANNEL(1),
941 SI1145_TEMP_CHANNEL(2),
942 SI1145_VOLTAGE_CHANNEL(3),
943 SI1145_UV_CHANNEL(4),
944 SI1145_PROXIMITY_CHANNEL(5, 0),
945 SI1145_PROXIMITY_CHANNEL(6, 1),
946 IIO_CHAN_SOFT_TIMESTAMP(7),
947 SI1145_CURRENT_CHANNEL(0),
948 SI1145_CURRENT_CHANNEL(1),
951 static const struct iio_chan_spec si1147_channels[] = {
952 SI1145_INTENSITY_CHANNEL(0),
953 SI1145_INTENSITY_IR_CHANNEL(1),
954 SI1145_PROXIMITY_CHANNEL(2, 0),
955 SI1145_PROXIMITY_CHANNEL(3, 1),
956 SI1145_PROXIMITY_CHANNEL(4, 2),
957 SI1145_TEMP_CHANNEL(5),
958 SI1145_VOLTAGE_CHANNEL(6),
959 SI1145_UV_CHANNEL(7),
960 IIO_CHAN_SOFT_TIMESTAMP(8),
961 SI1145_CURRENT_CHANNEL(0),
962 SI1145_CURRENT_CHANNEL(1),
963 SI1145_CURRENT_CHANNEL(2),
966 static struct attribute *si1132_attributes[] = {
967 &iio_const_attr_in_intensity_scale_available.dev_attr.attr,
968 &iio_const_attr_in_intensity_ir_scale_available.dev_attr.attr,
972 static struct attribute *si114x_attributes[] = {
973 &iio_const_attr_in_intensity_scale_available.dev_attr.attr,
974 &iio_const_attr_in_intensity_ir_scale_available.dev_attr.attr,
975 &iio_const_attr_in_proximity_scale_available.dev_attr.attr,
979 static const struct attribute_group si1132_attribute_group = {
980 .attrs = si1132_attributes,
983 static const struct attribute_group si114x_attribute_group = {
984 .attrs = si114x_attributes,
988 static const struct iio_info si1132_info = {
989 .read_raw = si1145_read_raw,
990 .write_raw = si1145_write_raw,
991 .attrs = &si1132_attribute_group,
994 static const struct iio_info si114x_info = {
995 .read_raw = si1145_read_raw,
996 .write_raw = si1145_write_raw,
997 .attrs = &si114x_attribute_group,
1000 #define SI1145_PART(id, iio_info, chans, leds, uncompressed_meas_rate) \
1001 {id, iio_info, chans, ARRAY_SIZE(chans), leds, uncompressed_meas_rate}
1003 static const struct si1145_part_info si1145_part_info[] = {
1004 [SI1132] = SI1145_PART(0x32, &si1132_info, si1132_channels, 0, true),
1005 [SI1141] = SI1145_PART(0x41, &si114x_info, si1141_channels, 1, false),
1006 [SI1142] = SI1145_PART(0x42, &si114x_info, si1142_channels, 2, false),
1007 [SI1143] = SI1145_PART(0x43, &si114x_info, si1143_channels, 3, false),
1008 [SI1145] = SI1145_PART(0x45, &si114x_info, si1145_channels, 1, true),
1009 [SI1146] = SI1145_PART(0x46, &si114x_info, si1146_channels, 2, true),
1010 [SI1147] = SI1145_PART(0x47, &si114x_info, si1147_channels, 3, true),
1013 static int si1145_initialize(struct si1145_data *data)
1015 struct i2c_client *client = data->client;
1018 ret = i2c_smbus_write_byte_data(client, SI1145_REG_COMMAND,
1022 msleep(SI1145_COMMAND_TIMEOUT_MS);
1024 /* Hardware key, magic value */
1025 ret = i2c_smbus_write_byte_data(client, SI1145_REG_HW_KEY, 0x17);
1028 msleep(SI1145_COMMAND_TIMEOUT_MS);
1030 /* Turn off autonomous mode */
1031 ret = si1145_set_meas_rate(data, 0);
1035 /* Initialize sampling freq to 10 Hz */
1036 ret = si1145_store_samp_freq(data, 10);
1040 /* Set LED currents to 45 mA; have 4 bits, see Table 2 in datasheet */
1041 switch (data->part_info->num_leds) {
1043 ret = i2c_smbus_write_byte_data(client,
1045 SI1145_LED_CURRENT_45mA);
1050 ret = i2c_smbus_write_byte_data(client,
1051 SI1145_REG_PS_LED21,
1052 (SI1145_LED_CURRENT_45mA << 4) |
1053 SI1145_LED_CURRENT_45mA);
1056 ret = i2c_smbus_write_byte_data(client,
1057 SI1145_REG_PS_LED21,
1058 SI1145_LED_CURRENT_45mA);
1067 /* Set normal proximity measurement mode */
1068 ret = si1145_param_set(data, SI1145_PARAM_PS_ADC_MISC,
1069 SI1145_PS_ADC_MODE_NORMAL);
1073 ret = si1145_param_set(data, SI1145_PARAM_PS_ADC_GAIN, 0x01);
1077 /* ADC_COUNTER should be one complement of ADC_GAIN */
1078 ret = si1145_param_set(data, SI1145_PARAM_PS_ADC_COUNTER, 0x06 << 4);
1082 /* Set ALS visible measurement mode */
1083 ret = si1145_param_set(data, SI1145_PARAM_ALSVIS_ADC_MISC,
1084 SI1145_ADC_MISC_RANGE);
1088 ret = si1145_param_set(data, SI1145_PARAM_ALSVIS_ADC_GAIN, 0x03);
1092 ret = si1145_param_set(data, SI1145_PARAM_ALSVIS_ADC_COUNTER,
1097 /* Set ALS IR measurement mode */
1098 ret = si1145_param_set(data, SI1145_PARAM_ALSIR_ADC_MISC,
1099 SI1145_ADC_MISC_RANGE);
1103 ret = si1145_param_set(data, SI1145_PARAM_ALSIR_ADC_GAIN, 0x01);
1107 ret = si1145_param_set(data, SI1145_PARAM_ALSIR_ADC_COUNTER,
1113 * Initialize UCOEF to default values in datasheet
1114 * These registers are normally zero on reset
1116 if (data->part_info == &si1145_part_info[SI1132] ||
1117 data->part_info == &si1145_part_info[SI1145] ||
1118 data->part_info == &si1145_part_info[SI1146] ||
1119 data->part_info == &si1145_part_info[SI1147]) {
1120 ret = i2c_smbus_write_byte_data(data->client,
1122 SI1145_UCOEF1_DEFAULT);
1125 ret = i2c_smbus_write_byte_data(data->client,
1126 SI1145_REG_UCOEF2, SI1145_UCOEF2_DEFAULT);
1129 ret = i2c_smbus_write_byte_data(data->client,
1130 SI1145_REG_UCOEF3, SI1145_UCOEF3_DEFAULT);
1133 ret = i2c_smbus_write_byte_data(data->client,
1134 SI1145_REG_UCOEF4, SI1145_UCOEF4_DEFAULT);
1143 * Program the channels we want to measure with CMD_PSALS_AUTO. No need for
1144 * _postdisable as we stop with CMD_PSALS_PAUSE; single measurement (direct)
1145 * mode reprograms the channels list anyway...
1147 static int si1145_buffer_preenable(struct iio_dev *indio_dev)
1149 struct si1145_data *data = iio_priv(indio_dev);
1152 mutex_lock(&data->lock);
1153 ret = si1145_set_chlist(indio_dev, *indio_dev->active_scan_mask);
1154 mutex_unlock(&data->lock);
1159 static bool si1145_validate_scan_mask(struct iio_dev *indio_dev,
1160 const unsigned long *scan_mask)
1162 struct si1145_data *data = iio_priv(indio_dev);
1163 unsigned int count = 0;
1166 /* Check that at most one AUX channel is enabled */
1167 for_each_set_bit(i, scan_mask, data->part_info->num_channels) {
1168 if (indio_dev->channels[i].address == SI1145_REG_AUX_DATA)
1175 static const struct iio_buffer_setup_ops si1145_buffer_setup_ops = {
1176 .preenable = si1145_buffer_preenable,
1177 .validate_scan_mask = si1145_validate_scan_mask,
1181 * si1145_trigger_set_state() - Set trigger state
1183 * When not using triggers interrupts are disabled and measurement rate is
1184 * set to zero in order to minimize power consumption.
1186 static int si1145_trigger_set_state(struct iio_trigger *trig, bool state)
1188 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
1189 struct si1145_data *data = iio_priv(indio_dev);
1192 mutex_lock(&data->lock);
1195 data->autonomous = true;
1196 err = i2c_smbus_write_byte_data(data->client,
1197 SI1145_REG_INT_CFG, SI1145_INT_CFG_OE);
1200 err = i2c_smbus_write_byte_data(data->client,
1201 SI1145_REG_IRQ_ENABLE, SI1145_MASK_ALL_IE);
1204 err = si1145_set_meas_rate(data, data->meas_rate);
1207 err = si1145_command(data, SI1145_CMD_PSALS_AUTO);
1212 /* Disable as much as possible skipping errors */
1213 ret = si1145_command(data, SI1145_CMD_PSALS_PAUSE);
1214 if (ret < 0 && !err)
1216 ret = si1145_set_meas_rate(data, 0);
1217 if (ret < 0 && !err)
1219 ret = i2c_smbus_write_byte_data(data->client,
1220 SI1145_REG_IRQ_ENABLE, 0);
1221 if (ret < 0 && !err)
1223 ret = i2c_smbus_write_byte_data(data->client,
1224 SI1145_REG_INT_CFG, 0);
1225 if (ret < 0 && !err)
1227 data->autonomous = false;
1230 mutex_unlock(&data->lock);
1234 static const struct iio_trigger_ops si1145_trigger_ops = {
1235 .set_trigger_state = si1145_trigger_set_state,
1238 static int si1145_probe_trigger(struct iio_dev *indio_dev)
1240 struct si1145_data *data = iio_priv(indio_dev);
1241 struct i2c_client *client = data->client;
1242 struct iio_trigger *trig;
1245 trig = devm_iio_trigger_alloc(&client->dev,
1246 "%s-dev%d", indio_dev->name, indio_dev->id);
1250 trig->dev.parent = &client->dev;
1251 trig->ops = &si1145_trigger_ops;
1252 iio_trigger_set_drvdata(trig, indio_dev);
1254 ret = devm_request_irq(&client->dev, client->irq,
1255 iio_trigger_generic_data_rdy_poll,
1256 IRQF_TRIGGER_FALLING,
1260 dev_err(&client->dev, "irq request failed\n");
1264 ret = devm_iio_trigger_register(&client->dev, trig);
1269 indio_dev->trig = iio_trigger_get(data->trig);
1274 static int si1145_probe(struct i2c_client *client,
1275 const struct i2c_device_id *id)
1277 struct si1145_data *data;
1278 struct iio_dev *indio_dev;
1279 u8 part_id, rev_id, seq_id;
1282 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
1286 data = iio_priv(indio_dev);
1287 i2c_set_clientdata(client, indio_dev);
1288 data->client = client;
1289 data->part_info = &si1145_part_info[id->driver_data];
1291 part_id = ret = i2c_smbus_read_byte_data(data->client,
1292 SI1145_REG_PART_ID);
1295 rev_id = ret = i2c_smbus_read_byte_data(data->client,
1299 seq_id = ret = i2c_smbus_read_byte_data(data->client,
1303 dev_info(&client->dev, "device ID part %#02hhx rev %#02hhx seq %#02hhx\n",
1304 part_id, rev_id, seq_id);
1305 if (part_id != data->part_info->part) {
1306 dev_err(&client->dev, "part ID mismatch got %#02hhx, expected %#02x\n",
1307 part_id, data->part_info->part);
1311 indio_dev->name = id->name;
1312 indio_dev->channels = data->part_info->channels;
1313 indio_dev->num_channels = data->part_info->num_channels;
1314 indio_dev->info = data->part_info->iio_info;
1315 indio_dev->modes = INDIO_DIRECT_MODE;
1317 mutex_init(&data->lock);
1318 mutex_init(&data->cmdlock);
1320 ret = si1145_initialize(data);
1324 ret = devm_iio_triggered_buffer_setup(&client->dev,
1326 si1145_trigger_handler, &si1145_buffer_setup_ops);
1331 ret = si1145_probe_trigger(indio_dev);
1335 dev_info(&client->dev, "no irq, using polling\n");
1338 return devm_iio_device_register(&client->dev, indio_dev);
1341 static const struct i2c_device_id si1145_ids[] = {
1342 { "si1132", SI1132 },
1343 { "si1141", SI1141 },
1344 { "si1142", SI1142 },
1345 { "si1143", SI1143 },
1346 { "si1145", SI1145 },
1347 { "si1146", SI1146 },
1348 { "si1147", SI1147 },
1351 MODULE_DEVICE_TABLE(i2c, si1145_ids);
1353 static struct i2c_driver si1145_driver = {
1357 .probe = si1145_probe,
1358 .id_table = si1145_ids,
1361 module_i2c_driver(si1145_driver);
1363 MODULE_AUTHOR("Peter Meerwald-Stadler <pmeerw@pmeerw.net>");
1364 MODULE_DESCRIPTION("Silabs SI1132 and SI1141/2/3/5/6/7 proximity, ambient light and UV index sensor driver");
1365 MODULE_LICENSE("GPL");