2 * si1145.c - Support for Silabs SI1132 and SI1141/2/3/5/6/7 combined ambient
3 * light, UV index and proximity sensors
5 * Copyright 2014-16 Peter Meerwald-Stadler <pmeerw@pmeerw.net>
6 * Copyright 2016 Crestez Dan Leonard <leonard.crestez@intel.com>
8 * This file is subject to the terms and conditions of version 2 of
9 * the GNU General Public License. See the file COPYING in the main
10 * directory of this archive for more details.
12 * SI1132 (7-bit I2C slave address 0x60)
13 * SI1141/2/3 (7-bit I2C slave address 0x5a)
14 * SI1145/6/6 (7-bit I2C slave address 0x60)
17 #include <linux/module.h>
18 #include <linux/i2c.h>
19 #include <linux/err.h>
20 #include <linux/slab.h>
21 #include <linux/delay.h>
22 #include <linux/irq.h>
23 #include <linux/gpio.h>
25 #include <linux/iio/iio.h>
26 #include <linux/iio/sysfs.h>
27 #include <linux/iio/trigger.h>
28 #include <linux/iio/trigger_consumer.h>
29 #include <linux/iio/triggered_buffer.h>
30 #include <linux/iio/buffer.h>
31 #include <linux/util_macros.h>
33 #define SI1145_REG_PART_ID 0x00
34 #define SI1145_REG_REV_ID 0x01
35 #define SI1145_REG_SEQ_ID 0x02
36 #define SI1145_REG_INT_CFG 0x03
37 #define SI1145_REG_IRQ_ENABLE 0x04
38 #define SI1145_REG_IRQ_MODE 0x05
39 #define SI1145_REG_HW_KEY 0x07
40 #define SI1145_REG_MEAS_RATE 0x08
41 #define SI1145_REG_PS_LED21 0x0f
42 #define SI1145_REG_PS_LED3 0x10
43 #define SI1145_REG_UCOEF1 0x13
44 #define SI1145_REG_UCOEF2 0x14
45 #define SI1145_REG_UCOEF3 0x15
46 #define SI1145_REG_UCOEF4 0x16
47 #define SI1145_REG_PARAM_WR 0x17
48 #define SI1145_REG_COMMAND 0x18
49 #define SI1145_REG_RESPONSE 0x20
50 #define SI1145_REG_IRQ_STATUS 0x21
51 #define SI1145_REG_ALSVIS_DATA 0x22
52 #define SI1145_REG_ALSIR_DATA 0x24
53 #define SI1145_REG_PS1_DATA 0x26
54 #define SI1145_REG_PS2_DATA 0x28
55 #define SI1145_REG_PS3_DATA 0x2a
56 #define SI1145_REG_AUX_DATA 0x2c
57 #define SI1145_REG_PARAM_RD 0x2e
58 #define SI1145_REG_CHIP_STAT 0x30
60 #define SI1145_UCOEF1_DEFAULT 0x7b
61 #define SI1145_UCOEF2_DEFAULT 0x6b
62 #define SI1145_UCOEF3_DEFAULT 0x01
63 #define SI1145_UCOEF4_DEFAULT 0x00
65 /* Helper to figure out PS_LED register / shift per channel */
66 #define SI1145_PS_LED_REG(ch) \
67 (((ch) == 2) ? SI1145_REG_PS_LED3 : SI1145_REG_PS_LED21)
68 #define SI1145_PS_LED_SHIFT(ch) \
71 /* Parameter offsets */
72 #define SI1145_PARAM_CHLIST 0x01
73 #define SI1145_PARAM_PSLED12_SELECT 0x02
74 #define SI1145_PARAM_PSLED3_SELECT 0x03
75 #define SI1145_PARAM_PS_ENCODING 0x05
76 #define SI1145_PARAM_ALS_ENCODING 0x06
77 #define SI1145_PARAM_PS1_ADC_MUX 0x07
78 #define SI1145_PARAM_PS2_ADC_MUX 0x08
79 #define SI1145_PARAM_PS3_ADC_MUX 0x09
80 #define SI1145_PARAM_PS_ADC_COUNTER 0x0a
81 #define SI1145_PARAM_PS_ADC_GAIN 0x0b
82 #define SI1145_PARAM_PS_ADC_MISC 0x0c
83 #define SI1145_PARAM_ALS_ADC_MUX 0x0d
84 #define SI1145_PARAM_ALSIR_ADC_MUX 0x0e
85 #define SI1145_PARAM_AUX_ADC_MUX 0x0f
86 #define SI1145_PARAM_ALSVIS_ADC_COUNTER 0x10
87 #define SI1145_PARAM_ALSVIS_ADC_GAIN 0x11
88 #define SI1145_PARAM_ALSVIS_ADC_MISC 0x12
89 #define SI1145_PARAM_LED_RECOVERY 0x1c
90 #define SI1145_PARAM_ALSIR_ADC_COUNTER 0x1d
91 #define SI1145_PARAM_ALSIR_ADC_GAIN 0x1e
92 #define SI1145_PARAM_ALSIR_ADC_MISC 0x1f
93 #define SI1145_PARAM_ADC_OFFSET 0x1a
95 /* Channel enable masks for CHLIST parameter */
96 #define SI1145_CHLIST_EN_PS1 BIT(0)
97 #define SI1145_CHLIST_EN_PS2 BIT(1)
98 #define SI1145_CHLIST_EN_PS3 BIT(2)
99 #define SI1145_CHLIST_EN_ALSVIS BIT(4)
100 #define SI1145_CHLIST_EN_ALSIR BIT(5)
101 #define SI1145_CHLIST_EN_AUX BIT(6)
102 #define SI1145_CHLIST_EN_UV BIT(7)
104 /* Proximity measurement mode for ADC_MISC parameter */
105 #define SI1145_PS_ADC_MODE_NORMAL BIT(2)
106 /* Signal range mask for ADC_MISC parameter */
107 #define SI1145_ADC_MISC_RANGE BIT(5)
109 /* Commands for REG_COMMAND */
110 #define SI1145_CMD_NOP 0x00
111 #define SI1145_CMD_RESET 0x01
112 #define SI1145_CMD_PS_FORCE 0x05
113 #define SI1145_CMD_ALS_FORCE 0x06
114 #define SI1145_CMD_PSALS_FORCE 0x07
115 #define SI1145_CMD_PS_PAUSE 0x09
116 #define SI1145_CMD_ALS_PAUSE 0x0a
117 #define SI1145_CMD_PSALS_PAUSE 0x0b
118 #define SI1145_CMD_PS_AUTO 0x0d
119 #define SI1145_CMD_ALS_AUTO 0x0e
120 #define SI1145_CMD_PSALS_AUTO 0x0f
121 #define SI1145_CMD_PARAM_QUERY 0x80
122 #define SI1145_CMD_PARAM_SET 0xa0
124 #define SI1145_RSP_INVALID_SETTING 0x80
125 #define SI1145_RSP_COUNTER_MASK 0x0F
127 /* Minimum sleep after each command to ensure it's received */
128 #define SI1145_COMMAND_MINSLEEP_MS 5
129 /* Return -ETIMEDOUT after this long */
130 #define SI1145_COMMAND_TIMEOUT_MS 25
132 /* Interrupt configuration masks for INT_CFG register */
133 #define SI1145_INT_CFG_OE BIT(0) /* enable interrupt */
134 #define SI1145_INT_CFG_MODE BIT(1) /* auto reset interrupt pin */
136 /* Interrupt enable masks for IRQ_ENABLE register */
137 #define SI1145_MASK_ALL_IE (BIT(4) | BIT(3) | BIT(2) | BIT(0))
139 #define SI1145_MUX_TEMP 0x65
140 #define SI1145_MUX_VDD 0x75
142 /* Proximity LED current; see Table 2 in datasheet */
143 #define SI1145_LED_CURRENT_45mA 0x04
155 struct si1145_part_info {
157 const struct iio_info *iio_info;
158 const struct iio_chan_spec *channels;
159 unsigned int num_channels;
160 unsigned int num_leds;
161 bool uncompressed_meas_rate;
165 * struct si1145_data - si1145 chip state data
166 * @client: I2C client
167 * @lock: mutex to protect shared state.
168 * @cmdlock: Low-level mutex to protect command execution only
169 * @rsp_seq: Next expected response number or -1 if counter reset required
170 * @scan_mask: Saved scan mask to avoid duplicate set_chlist
171 * @autonomous: If automatic measurements are active (for buffer support)
172 * @part_info: Part information
173 * @trig: Pointer to iio trigger
174 * @meas_rate: Value of MEAS_RATE register. Only set in HW in auto mode
177 struct i2c_client *client;
179 struct mutex cmdlock;
181 const struct si1145_part_info *part_info;
182 unsigned long scan_mask;
184 struct iio_trigger *trig;
189 * __si1145_command_reset() - Send CMD_NOP and wait for response 0
191 * Does not modify data->rsp_seq
193 * Return: 0 on success and -errno on error.
195 static int __si1145_command_reset(struct si1145_data *data)
197 struct device *dev = &data->client->dev;
198 unsigned long stop_jiffies;
201 ret = i2c_smbus_write_byte_data(data->client, SI1145_REG_COMMAND,
205 msleep(SI1145_COMMAND_MINSLEEP_MS);
207 stop_jiffies = jiffies + SI1145_COMMAND_TIMEOUT_MS * HZ / 1000;
209 ret = i2c_smbus_read_byte_data(data->client,
210 SI1145_REG_RESPONSE);
213 if (time_after(jiffies, stop_jiffies)) {
214 dev_warn(dev, "timeout on reset\n");
217 msleep(SI1145_COMMAND_MINSLEEP_MS);
223 * si1145_command() - Execute a command and poll the response register
225 * All conversion overflows are reported as -EOVERFLOW
226 * INVALID_SETTING is reported as -EINVAL
227 * Timeouts are reported as -ETIMEDOUT
229 * Return: 0 on success or -errno on failure
231 static int si1145_command(struct si1145_data *data, u8 cmd)
233 struct device *dev = &data->client->dev;
234 unsigned long stop_jiffies;
237 mutex_lock(&data->cmdlock);
239 if (data->rsp_seq < 0) {
240 ret = __si1145_command_reset(data);
242 dev_err(dev, "failed to reset command counter, ret=%d\n",
249 ret = i2c_smbus_write_byte_data(data->client, SI1145_REG_COMMAND, cmd);
251 dev_warn(dev, "failed to write command, ret=%d\n", ret);
254 /* Sleep a little to ensure the command is received */
255 msleep(SI1145_COMMAND_MINSLEEP_MS);
257 stop_jiffies = jiffies + SI1145_COMMAND_TIMEOUT_MS * HZ / 1000;
259 ret = i2c_smbus_read_byte_data(data->client,
260 SI1145_REG_RESPONSE);
262 dev_warn(dev, "failed to read response, ret=%d\n", ret);
266 if ((ret & ~SI1145_RSP_COUNTER_MASK) == 0) {
267 if (ret == data->rsp_seq) {
268 if (time_after(jiffies, stop_jiffies)) {
269 dev_warn(dev, "timeout on command %#02hhx\n",
274 msleep(SI1145_COMMAND_MINSLEEP_MS);
277 if (ret == ((data->rsp_seq + 1) &
278 SI1145_RSP_COUNTER_MASK)) {
283 dev_warn(dev, "unexpected response counter %d instead of %d\n",
284 ret, (data->rsp_seq + 1) &
285 SI1145_RSP_COUNTER_MASK);
288 if (ret == SI1145_RSP_INVALID_SETTING) {
289 dev_warn(dev, "INVALID_SETTING error on command %#02hhx\n",
293 /* All overflows are treated identically */
294 dev_dbg(dev, "overflow, ret=%d, cmd=%#02hhx\n",
300 /* Force a counter reset next time */
306 mutex_unlock(&data->cmdlock);
311 static int si1145_param_update(struct si1145_data *data, u8 op, u8 param,
316 ret = i2c_smbus_write_byte_data(data->client,
317 SI1145_REG_PARAM_WR, value);
321 return si1145_command(data, op | (param & 0x1F));
324 static int si1145_param_set(struct si1145_data *data, u8 param, u8 value)
326 return si1145_param_update(data, SI1145_CMD_PARAM_SET, param, value);
329 /* Set param. Returns negative errno or current value */
330 static int si1145_param_query(struct si1145_data *data, u8 param)
334 ret = si1145_command(data, SI1145_CMD_PARAM_QUERY | (param & 0x1F));
338 return i2c_smbus_read_byte_data(data->client, SI1145_REG_PARAM_RD);
341 /* Expand 8 bit compressed value to 16 bit, see Silabs AN498 */
342 static u16 si1145_uncompress(u8 x)
350 exponent = (x & 0xf0) >> 4;
351 result = 0x10 | (x & 0x0f);
354 return result << (exponent - 4);
355 return result >> (4 - exponent);
358 /* Compress 16 bit value to 8 bit, see Silabs AN498 */
359 static u8 si1145_compress(u16 x)
378 significand = x << (4 - exponent);
379 return (exponent << 4) | (significand & 0xF);
382 significand = x >> (exponent - 5);
383 if (significand & 1) {
385 if (significand & 0x0040) {
391 return (exponent << 4) | ((significand >> 1) & 0xF);
394 /* Write meas_rate in hardware */
395 static int si1145_set_meas_rate(struct si1145_data *data, int interval)
397 if (data->part_info->uncompressed_meas_rate)
398 return i2c_smbus_write_word_data(data->client,
399 SI1145_REG_MEAS_RATE, interval);
401 return i2c_smbus_write_byte_data(data->client,
402 SI1145_REG_MEAS_RATE, interval);
405 static int si1145_read_samp_freq(struct si1145_data *data, int *val, int *val2)
408 if (data->part_info->uncompressed_meas_rate)
409 *val2 = data->meas_rate;
411 *val2 = si1145_uncompress(data->meas_rate);
412 return IIO_VAL_FRACTIONAL;
415 /* Set the samp freq in driver private data */
416 static int si1145_store_samp_freq(struct si1145_data *data, int val)
421 if (val <= 0 || val > 32000)
423 meas_rate = 32000 / val;
425 mutex_lock(&data->lock);
426 if (data->autonomous) {
427 ret = si1145_set_meas_rate(data, meas_rate);
431 if (data->part_info->uncompressed_meas_rate)
432 data->meas_rate = meas_rate;
434 data->meas_rate = si1145_compress(meas_rate);
437 mutex_unlock(&data->lock);
442 static irqreturn_t si1145_trigger_handler(int irq, void *private)
444 struct iio_poll_func *pf = private;
445 struct iio_dev *indio_dev = pf->indio_dev;
446 struct si1145_data *data = iio_priv(indio_dev);
448 * Maximum buffer size:
449 * 6*2 bytes channels data + 4 bytes alignment +
457 if (!data->autonomous) {
458 ret = si1145_command(data, SI1145_CMD_PSALS_FORCE);
459 if (ret < 0 && ret != -EOVERFLOW)
462 irq_status = ret = i2c_smbus_read_byte_data(data->client,
463 SI1145_REG_IRQ_STATUS);
466 if (!(irq_status & SI1145_MASK_ALL_IE))
470 for_each_set_bit(i, indio_dev->active_scan_mask,
471 indio_dev->masklength) {
474 while (i + run < indio_dev->masklength) {
475 if (!test_bit(i + run, indio_dev->active_scan_mask))
477 if (indio_dev->channels[i + run].address !=
478 indio_dev->channels[i].address + 2 * run)
483 ret = i2c_smbus_read_i2c_block_data_or_emulated(
484 data->client, indio_dev->channels[i].address,
485 sizeof(u16) * run, &buffer[j]);
488 j += run * sizeof(u16);
492 if (data->autonomous) {
493 ret = i2c_smbus_write_byte_data(data->client,
494 SI1145_REG_IRQ_STATUS,
495 irq_status & SI1145_MASK_ALL_IE);
500 iio_push_to_buffers_with_timestamp(indio_dev, buffer,
501 iio_get_time_ns(indio_dev));
504 iio_trigger_notify_done(indio_dev->trig);
508 static int si1145_set_chlist(struct iio_dev *indio_dev, unsigned long scan_mask)
510 struct si1145_data *data = iio_priv(indio_dev);
515 /* channel list already set, no need to reprogram */
516 if (data->scan_mask == scan_mask)
519 for_each_set_bit(i, &scan_mask, indio_dev->masklength) {
520 switch (indio_dev->channels[i].address) {
521 case SI1145_REG_ALSVIS_DATA:
522 reg |= SI1145_CHLIST_EN_ALSVIS;
524 case SI1145_REG_ALSIR_DATA:
525 reg |= SI1145_CHLIST_EN_ALSIR;
527 case SI1145_REG_PS1_DATA:
528 reg |= SI1145_CHLIST_EN_PS1;
530 case SI1145_REG_PS2_DATA:
531 reg |= SI1145_CHLIST_EN_PS2;
533 case SI1145_REG_PS3_DATA:
534 reg |= SI1145_CHLIST_EN_PS3;
536 case SI1145_REG_AUX_DATA:
537 switch (indio_dev->channels[i].type) {
539 reg |= SI1145_CHLIST_EN_UV;
542 reg |= SI1145_CHLIST_EN_AUX;
543 if (indio_dev->channels[i].type == IIO_TEMP)
544 mux = SI1145_MUX_TEMP;
546 mux = SI1145_MUX_VDD;
547 ret = si1145_param_set(data,
548 SI1145_PARAM_AUX_ADC_MUX, mux);
557 data->scan_mask = scan_mask;
558 ret = si1145_param_set(data, SI1145_PARAM_CHLIST, reg);
560 return ret < 0 ? ret : 0;
563 static int si1145_measure(struct iio_dev *indio_dev,
564 struct iio_chan_spec const *chan)
566 struct si1145_data *data = iio_priv(indio_dev);
570 ret = si1145_set_chlist(indio_dev, BIT(chan->scan_index));
574 cmd = (chan->type == IIO_PROXIMITY) ? SI1145_CMD_PS_FORCE :
575 SI1145_CMD_ALS_FORCE;
576 ret = si1145_command(data, cmd);
577 if (ret < 0 && ret != -EOVERFLOW)
580 return i2c_smbus_read_word_data(data->client, chan->address);
584 * Conversion between iio scale and ADC_GAIN values
585 * These could be further adjusted but proximity/intensity are dimensionless
587 static const int si1145_proximity_scale_available[] = {
588 128, 64, 32, 16, 8, 4};
589 static const int si1145_intensity_scale_available[] = {
590 128, 64, 32, 16, 8, 4, 2, 1};
591 static IIO_CONST_ATTR(in_proximity_scale_available,
593 static IIO_CONST_ATTR(in_intensity_scale_available,
594 "128 64 32 16 8 4 2 1");
595 static IIO_CONST_ATTR(in_intensity_ir_scale_available,
596 "128 64 32 16 8 4 2 1");
598 static int si1145_scale_from_adcgain(int regval)
600 return 128 >> regval;
603 static int si1145_proximity_adcgain_from_scale(int val, int val2)
605 val = find_closest_descending(val, si1145_proximity_scale_available,
606 ARRAY_SIZE(si1145_proximity_scale_available));
607 if (val < 0 || val > 5 || val2 != 0)
613 static int si1145_intensity_adcgain_from_scale(int val, int val2)
615 val = find_closest_descending(val, si1145_intensity_scale_available,
616 ARRAY_SIZE(si1145_intensity_scale_available));
617 if (val < 0 || val > 7 || val2 != 0)
623 static int si1145_read_raw(struct iio_dev *indio_dev,
624 struct iio_chan_spec const *chan,
625 int *val, int *val2, long mask)
627 struct si1145_data *data = iio_priv(indio_dev);
632 case IIO_CHAN_INFO_RAW:
633 switch (chan->type) {
639 ret = iio_device_claim_direct_mode(indio_dev);
642 ret = si1145_measure(indio_dev, chan);
643 iio_device_release_direct_mode(indio_dev);
652 ret = i2c_smbus_read_byte_data(data->client,
653 SI1145_PS_LED_REG(chan->channel));
657 *val = (ret >> SI1145_PS_LED_SHIFT(chan->channel))
664 case IIO_CHAN_INFO_SCALE:
665 switch (chan->type) {
667 reg = SI1145_PARAM_PS_ADC_GAIN;
670 if (chan->channel2 == IIO_MOD_LIGHT_IR)
671 reg = SI1145_PARAM_ALSIR_ADC_GAIN;
673 reg = SI1145_PARAM_ALSVIS_ADC_GAIN;
678 return IIO_VAL_INT_PLUS_MICRO;
682 return IIO_VAL_INT_PLUS_MICRO;
687 ret = si1145_param_query(data, reg);
691 *val = si1145_scale_from_adcgain(ret & 0x07);
694 case IIO_CHAN_INFO_OFFSET:
695 switch (chan->type) {
698 * -ADC offset - ADC counts @ 25°C -
699 * 35 * ADC counts / °C
701 *val = -256 - 11136 + 25 * 35;
705 * All ADC measurements have are by default offset
709 ret = si1145_param_query(data, SI1145_PARAM_ADC_OFFSET);
712 *val = -si1145_uncompress(ret);
715 case IIO_CHAN_INFO_SAMP_FREQ:
716 return si1145_read_samp_freq(data, val, val2);
722 static int si1145_write_raw(struct iio_dev *indio_dev,
723 struct iio_chan_spec const *chan,
724 int val, int val2, long mask)
726 struct si1145_data *data = iio_priv(indio_dev);
727 u8 reg1, reg2, shift;
731 case IIO_CHAN_INFO_SCALE:
732 switch (chan->type) {
734 val = si1145_proximity_adcgain_from_scale(val, val2);
737 reg1 = SI1145_PARAM_PS_ADC_GAIN;
738 reg2 = SI1145_PARAM_PS_ADC_COUNTER;
741 val = si1145_intensity_adcgain_from_scale(val, val2);
744 if (chan->channel2 == IIO_MOD_LIGHT_IR) {
745 reg1 = SI1145_PARAM_ALSIR_ADC_GAIN;
746 reg2 = SI1145_PARAM_ALSIR_ADC_COUNTER;
748 reg1 = SI1145_PARAM_ALSVIS_ADC_GAIN;
749 reg2 = SI1145_PARAM_ALSVIS_ADC_COUNTER;
756 ret = iio_device_claim_direct_mode(indio_dev);
760 ret = si1145_param_set(data, reg1, val);
762 iio_device_release_direct_mode(indio_dev);
765 /* Set recovery period to one's complement of gain */
766 ret = si1145_param_set(data, reg2, (~val & 0x07) << 4);
767 iio_device_release_direct_mode(indio_dev);
769 case IIO_CHAN_INFO_RAW:
770 if (chan->type != IIO_CURRENT)
773 if (val < 0 || val > 15 || val2 != 0)
776 reg1 = SI1145_PS_LED_REG(chan->channel);
777 shift = SI1145_PS_LED_SHIFT(chan->channel);
779 ret = iio_device_claim_direct_mode(indio_dev);
783 ret = i2c_smbus_read_byte_data(data->client, reg1);
785 iio_device_release_direct_mode(indio_dev);
788 ret = i2c_smbus_write_byte_data(data->client, reg1,
789 (ret & ~(0x0f << shift)) |
790 ((val & 0x0f) << shift));
791 iio_device_release_direct_mode(indio_dev);
793 case IIO_CHAN_INFO_SAMP_FREQ:
794 return si1145_store_samp_freq(data, val);
800 #define SI1145_ST { \
804 .endianness = IIO_LE, \
807 #define SI1145_INTENSITY_CHANNEL(_si) { \
808 .type = IIO_INTENSITY, \
809 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
810 BIT(IIO_CHAN_INFO_OFFSET) | \
811 BIT(IIO_CHAN_INFO_SCALE), \
812 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
813 .scan_type = SI1145_ST, \
815 .address = SI1145_REG_ALSVIS_DATA, \
818 #define SI1145_INTENSITY_IR_CHANNEL(_si) { \
819 .type = IIO_INTENSITY, \
820 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
821 BIT(IIO_CHAN_INFO_OFFSET) | \
822 BIT(IIO_CHAN_INFO_SCALE), \
823 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
825 .channel2 = IIO_MOD_LIGHT_IR, \
826 .scan_type = SI1145_ST, \
828 .address = SI1145_REG_ALSIR_DATA, \
831 #define SI1145_TEMP_CHANNEL(_si) { \
833 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
834 BIT(IIO_CHAN_INFO_OFFSET) | \
835 BIT(IIO_CHAN_INFO_SCALE), \
836 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
837 .scan_type = SI1145_ST, \
839 .address = SI1145_REG_AUX_DATA, \
842 #define SI1145_UV_CHANNEL(_si) { \
843 .type = IIO_UVINDEX, \
844 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
845 BIT(IIO_CHAN_INFO_SCALE), \
846 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
847 .scan_type = SI1145_ST, \
849 .address = SI1145_REG_AUX_DATA, \
852 #define SI1145_PROXIMITY_CHANNEL(_si, _ch) { \
853 .type = IIO_PROXIMITY, \
856 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
857 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
858 BIT(IIO_CHAN_INFO_OFFSET), \
859 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
860 .scan_type = SI1145_ST, \
862 .address = SI1145_REG_PS1_DATA + _ch * 2, \
865 #define SI1145_VOLTAGE_CHANNEL(_si) { \
866 .type = IIO_VOLTAGE, \
867 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
868 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
869 .scan_type = SI1145_ST, \
871 .address = SI1145_REG_AUX_DATA, \
874 #define SI1145_CURRENT_CHANNEL(_ch) { \
875 .type = IIO_CURRENT, \
880 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
883 static const struct iio_chan_spec si1132_channels[] = {
884 SI1145_INTENSITY_CHANNEL(0),
885 SI1145_INTENSITY_IR_CHANNEL(1),
886 SI1145_TEMP_CHANNEL(2),
887 SI1145_VOLTAGE_CHANNEL(3),
888 SI1145_UV_CHANNEL(4),
889 IIO_CHAN_SOFT_TIMESTAMP(6),
892 static const struct iio_chan_spec si1141_channels[] = {
893 SI1145_INTENSITY_CHANNEL(0),
894 SI1145_INTENSITY_IR_CHANNEL(1),
895 SI1145_PROXIMITY_CHANNEL(2, 0),
896 SI1145_TEMP_CHANNEL(3),
897 SI1145_VOLTAGE_CHANNEL(4),
898 IIO_CHAN_SOFT_TIMESTAMP(5),
899 SI1145_CURRENT_CHANNEL(0),
902 static const struct iio_chan_spec si1142_channels[] = {
903 SI1145_INTENSITY_CHANNEL(0),
904 SI1145_INTENSITY_IR_CHANNEL(1),
905 SI1145_PROXIMITY_CHANNEL(2, 0),
906 SI1145_PROXIMITY_CHANNEL(3, 1),
907 SI1145_TEMP_CHANNEL(4),
908 SI1145_VOLTAGE_CHANNEL(5),
909 IIO_CHAN_SOFT_TIMESTAMP(6),
910 SI1145_CURRENT_CHANNEL(0),
911 SI1145_CURRENT_CHANNEL(1),
914 static const struct iio_chan_spec si1143_channels[] = {
915 SI1145_INTENSITY_CHANNEL(0),
916 SI1145_INTENSITY_IR_CHANNEL(1),
917 SI1145_PROXIMITY_CHANNEL(2, 0),
918 SI1145_PROXIMITY_CHANNEL(3, 1),
919 SI1145_PROXIMITY_CHANNEL(4, 2),
920 SI1145_TEMP_CHANNEL(5),
921 SI1145_VOLTAGE_CHANNEL(6),
922 IIO_CHAN_SOFT_TIMESTAMP(7),
923 SI1145_CURRENT_CHANNEL(0),
924 SI1145_CURRENT_CHANNEL(1),
925 SI1145_CURRENT_CHANNEL(2),
928 static const struct iio_chan_spec si1145_channels[] = {
929 SI1145_INTENSITY_CHANNEL(0),
930 SI1145_INTENSITY_IR_CHANNEL(1),
931 SI1145_PROXIMITY_CHANNEL(2, 0),
932 SI1145_TEMP_CHANNEL(3),
933 SI1145_VOLTAGE_CHANNEL(4),
934 SI1145_UV_CHANNEL(5),
935 IIO_CHAN_SOFT_TIMESTAMP(6),
936 SI1145_CURRENT_CHANNEL(0),
939 static const struct iio_chan_spec si1146_channels[] = {
940 SI1145_INTENSITY_CHANNEL(0),
941 SI1145_INTENSITY_IR_CHANNEL(1),
942 SI1145_TEMP_CHANNEL(2),
943 SI1145_VOLTAGE_CHANNEL(3),
944 SI1145_UV_CHANNEL(4),
945 SI1145_PROXIMITY_CHANNEL(5, 0),
946 SI1145_PROXIMITY_CHANNEL(6, 1),
947 IIO_CHAN_SOFT_TIMESTAMP(7),
948 SI1145_CURRENT_CHANNEL(0),
949 SI1145_CURRENT_CHANNEL(1),
952 static const struct iio_chan_spec si1147_channels[] = {
953 SI1145_INTENSITY_CHANNEL(0),
954 SI1145_INTENSITY_IR_CHANNEL(1),
955 SI1145_PROXIMITY_CHANNEL(2, 0),
956 SI1145_PROXIMITY_CHANNEL(3, 1),
957 SI1145_PROXIMITY_CHANNEL(4, 2),
958 SI1145_TEMP_CHANNEL(5),
959 SI1145_VOLTAGE_CHANNEL(6),
960 SI1145_UV_CHANNEL(7),
961 IIO_CHAN_SOFT_TIMESTAMP(8),
962 SI1145_CURRENT_CHANNEL(0),
963 SI1145_CURRENT_CHANNEL(1),
964 SI1145_CURRENT_CHANNEL(2),
967 static struct attribute *si1132_attributes[] = {
968 &iio_const_attr_in_intensity_scale_available.dev_attr.attr,
969 &iio_const_attr_in_intensity_ir_scale_available.dev_attr.attr,
973 static struct attribute *si114x_attributes[] = {
974 &iio_const_attr_in_intensity_scale_available.dev_attr.attr,
975 &iio_const_attr_in_intensity_ir_scale_available.dev_attr.attr,
976 &iio_const_attr_in_proximity_scale_available.dev_attr.attr,
980 static const struct attribute_group si1132_attribute_group = {
981 .attrs = si1132_attributes,
984 static const struct attribute_group si114x_attribute_group = {
985 .attrs = si114x_attributes,
989 static const struct iio_info si1132_info = {
990 .read_raw = si1145_read_raw,
991 .write_raw = si1145_write_raw,
992 .driver_module = THIS_MODULE,
993 .attrs = &si1132_attribute_group,
996 static const struct iio_info si114x_info = {
997 .read_raw = si1145_read_raw,
998 .write_raw = si1145_write_raw,
999 .driver_module = THIS_MODULE,
1000 .attrs = &si114x_attribute_group,
1003 #define SI1145_PART(id, iio_info, chans, leds, uncompressed_meas_rate) \
1004 {id, iio_info, chans, ARRAY_SIZE(chans), leds, uncompressed_meas_rate}
1006 static const struct si1145_part_info si1145_part_info[] = {
1007 [SI1132] = SI1145_PART(0x32, &si1132_info, si1132_channels, 0, true),
1008 [SI1141] = SI1145_PART(0x41, &si114x_info, si1141_channels, 1, false),
1009 [SI1142] = SI1145_PART(0x42, &si114x_info, si1142_channels, 2, false),
1010 [SI1143] = SI1145_PART(0x43, &si114x_info, si1143_channels, 3, false),
1011 [SI1145] = SI1145_PART(0x45, &si114x_info, si1145_channels, 1, true),
1012 [SI1146] = SI1145_PART(0x46, &si114x_info, si1146_channels, 2, true),
1013 [SI1147] = SI1145_PART(0x47, &si114x_info, si1147_channels, 3, true),
1016 static int si1145_initialize(struct si1145_data *data)
1018 struct i2c_client *client = data->client;
1021 ret = i2c_smbus_write_byte_data(client, SI1145_REG_COMMAND,
1025 msleep(SI1145_COMMAND_TIMEOUT_MS);
1027 /* Hardware key, magic value */
1028 ret = i2c_smbus_write_byte_data(client, SI1145_REG_HW_KEY, 0x17);
1031 msleep(SI1145_COMMAND_TIMEOUT_MS);
1033 /* Turn off autonomous mode */
1034 ret = si1145_set_meas_rate(data, 0);
1038 /* Initialize sampling freq to 10 Hz */
1039 ret = si1145_store_samp_freq(data, 10);
1043 /* Set LED currents to 45 mA; have 4 bits, see Table 2 in datasheet */
1044 switch (data->part_info->num_leds) {
1046 ret = i2c_smbus_write_byte_data(client,
1048 SI1145_LED_CURRENT_45mA);
1053 ret = i2c_smbus_write_byte_data(client,
1054 SI1145_REG_PS_LED21,
1055 (SI1145_LED_CURRENT_45mA << 4) |
1056 SI1145_LED_CURRENT_45mA);
1059 ret = i2c_smbus_write_byte_data(client,
1060 SI1145_REG_PS_LED21,
1061 SI1145_LED_CURRENT_45mA);
1070 /* Set normal proximity measurement mode */
1071 ret = si1145_param_set(data, SI1145_PARAM_PS_ADC_MISC,
1072 SI1145_PS_ADC_MODE_NORMAL);
1076 ret = si1145_param_set(data, SI1145_PARAM_PS_ADC_GAIN, 0x01);
1080 /* ADC_COUNTER should be one complement of ADC_GAIN */
1081 ret = si1145_param_set(data, SI1145_PARAM_PS_ADC_COUNTER, 0x06 << 4);
1085 /* Set ALS visible measurement mode */
1086 ret = si1145_param_set(data, SI1145_PARAM_ALSVIS_ADC_MISC,
1087 SI1145_ADC_MISC_RANGE);
1091 ret = si1145_param_set(data, SI1145_PARAM_ALSVIS_ADC_GAIN, 0x03);
1095 ret = si1145_param_set(data, SI1145_PARAM_ALSVIS_ADC_COUNTER,
1100 /* Set ALS IR measurement mode */
1101 ret = si1145_param_set(data, SI1145_PARAM_ALSIR_ADC_MISC,
1102 SI1145_ADC_MISC_RANGE);
1106 ret = si1145_param_set(data, SI1145_PARAM_ALSIR_ADC_GAIN, 0x01);
1110 ret = si1145_param_set(data, SI1145_PARAM_ALSIR_ADC_COUNTER,
1116 * Initialize UCOEF to default values in datasheet
1117 * These registers are normally zero on reset
1119 if (data->part_info == &si1145_part_info[SI1132] ||
1120 data->part_info == &si1145_part_info[SI1145] ||
1121 data->part_info == &si1145_part_info[SI1146] ||
1122 data->part_info == &si1145_part_info[SI1147]) {
1123 ret = i2c_smbus_write_byte_data(data->client,
1125 SI1145_UCOEF1_DEFAULT);
1128 ret = i2c_smbus_write_byte_data(data->client,
1129 SI1145_REG_UCOEF2, SI1145_UCOEF2_DEFAULT);
1132 ret = i2c_smbus_write_byte_data(data->client,
1133 SI1145_REG_UCOEF3, SI1145_UCOEF3_DEFAULT);
1136 ret = i2c_smbus_write_byte_data(data->client,
1137 SI1145_REG_UCOEF4, SI1145_UCOEF4_DEFAULT);
1146 * Program the channels we want to measure with CMD_PSALS_AUTO. No need for
1147 * _postdisable as we stop with CMD_PSALS_PAUSE; single measurement (direct)
1148 * mode reprograms the channels list anyway...
1150 static int si1145_buffer_preenable(struct iio_dev *indio_dev)
1152 struct si1145_data *data = iio_priv(indio_dev);
1155 mutex_lock(&data->lock);
1156 ret = si1145_set_chlist(indio_dev, *indio_dev->active_scan_mask);
1157 mutex_unlock(&data->lock);
1162 static bool si1145_validate_scan_mask(struct iio_dev *indio_dev,
1163 const unsigned long *scan_mask)
1165 struct si1145_data *data = iio_priv(indio_dev);
1166 unsigned int count = 0;
1169 /* Check that at most one AUX channel is enabled */
1170 for_each_set_bit(i, scan_mask, data->part_info->num_channels) {
1171 if (indio_dev->channels[i].address == SI1145_REG_AUX_DATA)
1178 static const struct iio_buffer_setup_ops si1145_buffer_setup_ops = {
1179 .preenable = si1145_buffer_preenable,
1180 .postenable = iio_triggered_buffer_postenable,
1181 .predisable = iio_triggered_buffer_predisable,
1182 .validate_scan_mask = si1145_validate_scan_mask,
1186 * si1145_trigger_set_state() - Set trigger state
1188 * When not using triggers interrupts are disabled and measurement rate is
1189 * set to zero in order to minimize power consumption.
1191 static int si1145_trigger_set_state(struct iio_trigger *trig, bool state)
1193 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
1194 struct si1145_data *data = iio_priv(indio_dev);
1197 mutex_lock(&data->lock);
1200 data->autonomous = true;
1201 err = i2c_smbus_write_byte_data(data->client,
1202 SI1145_REG_INT_CFG, SI1145_INT_CFG_OE);
1205 err = i2c_smbus_write_byte_data(data->client,
1206 SI1145_REG_IRQ_ENABLE, SI1145_MASK_ALL_IE);
1209 err = si1145_set_meas_rate(data, data->meas_rate);
1212 err = si1145_command(data, SI1145_CMD_PSALS_AUTO);
1217 /* Disable as much as possible skipping errors */
1218 ret = si1145_command(data, SI1145_CMD_PSALS_PAUSE);
1219 if (ret < 0 && !err)
1221 ret = si1145_set_meas_rate(data, 0);
1222 if (ret < 0 && !err)
1224 ret = i2c_smbus_write_byte_data(data->client,
1225 SI1145_REG_IRQ_ENABLE, 0);
1226 if (ret < 0 && !err)
1228 ret = i2c_smbus_write_byte_data(data->client,
1229 SI1145_REG_INT_CFG, 0);
1230 if (ret < 0 && !err)
1232 data->autonomous = false;
1235 mutex_unlock(&data->lock);
1239 static const struct iio_trigger_ops si1145_trigger_ops = {
1240 .owner = THIS_MODULE,
1241 .set_trigger_state = si1145_trigger_set_state,
1244 static int si1145_probe_trigger(struct iio_dev *indio_dev)
1246 struct si1145_data *data = iio_priv(indio_dev);
1247 struct i2c_client *client = data->client;
1248 struct iio_trigger *trig;
1251 trig = devm_iio_trigger_alloc(&client->dev,
1252 "%s-dev%d", indio_dev->name, indio_dev->id);
1256 trig->dev.parent = &client->dev;
1257 trig->ops = &si1145_trigger_ops;
1258 iio_trigger_set_drvdata(trig, indio_dev);
1260 ret = devm_request_irq(&client->dev, client->irq,
1261 iio_trigger_generic_data_rdy_poll,
1262 IRQF_TRIGGER_FALLING,
1266 dev_err(&client->dev, "irq request failed\n");
1270 ret = iio_trigger_register(trig);
1275 indio_dev->trig = iio_trigger_get(data->trig);
1280 static void si1145_remove_trigger(struct iio_dev *indio_dev)
1282 struct si1145_data *data = iio_priv(indio_dev);
1285 iio_trigger_unregister(data->trig);
1290 static int si1145_probe(struct i2c_client *client,
1291 const struct i2c_device_id *id)
1293 struct si1145_data *data;
1294 struct iio_dev *indio_dev;
1295 u8 part_id, rev_id, seq_id;
1298 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
1302 data = iio_priv(indio_dev);
1303 i2c_set_clientdata(client, indio_dev);
1304 data->client = client;
1305 data->part_info = &si1145_part_info[id->driver_data];
1307 part_id = ret = i2c_smbus_read_byte_data(data->client,
1308 SI1145_REG_PART_ID);
1311 rev_id = ret = i2c_smbus_read_byte_data(data->client,
1315 seq_id = ret = i2c_smbus_read_byte_data(data->client,
1319 dev_info(&client->dev, "device ID part %#02hhx rev %#02hhx seq %#02hhx\n",
1320 part_id, rev_id, seq_id);
1321 if (part_id != data->part_info->part) {
1322 dev_err(&client->dev, "part ID mismatch got %#02hhx, expected %#02x\n",
1323 part_id, data->part_info->part);
1327 indio_dev->dev.parent = &client->dev;
1328 indio_dev->name = id->name;
1329 indio_dev->channels = data->part_info->channels;
1330 indio_dev->num_channels = data->part_info->num_channels;
1331 indio_dev->info = data->part_info->iio_info;
1332 indio_dev->modes = INDIO_DIRECT_MODE;
1334 mutex_init(&data->lock);
1335 mutex_init(&data->cmdlock);
1337 ret = si1145_initialize(data);
1341 ret = iio_triggered_buffer_setup(indio_dev, NULL,
1342 si1145_trigger_handler, &si1145_buffer_setup_ops);
1347 ret = si1145_probe_trigger(indio_dev);
1349 goto error_free_buffer;
1351 dev_info(&client->dev, "no irq, using polling\n");
1354 ret = iio_device_register(indio_dev);
1356 goto error_free_trigger;
1361 si1145_remove_trigger(indio_dev);
1363 iio_triggered_buffer_cleanup(indio_dev);
1368 static const struct i2c_device_id si1145_ids[] = {
1369 { "si1132", SI1132 },
1370 { "si1141", SI1141 },
1371 { "si1142", SI1142 },
1372 { "si1143", SI1143 },
1373 { "si1145", SI1145 },
1374 { "si1146", SI1146 },
1375 { "si1147", SI1147 },
1378 MODULE_DEVICE_TABLE(i2c, si1145_ids);
1380 static int si1145_remove(struct i2c_client *client)
1382 struct iio_dev *indio_dev = i2c_get_clientdata(client);
1384 iio_device_unregister(indio_dev);
1385 si1145_remove_trigger(indio_dev);
1386 iio_triggered_buffer_cleanup(indio_dev);
1391 static struct i2c_driver si1145_driver = {
1395 .probe = si1145_probe,
1396 .remove = si1145_remove,
1397 .id_table = si1145_ids,
1400 module_i2c_driver(si1145_driver);
1402 MODULE_AUTHOR("Peter Meerwald-Stadler <pmeerw@pmeerw.net>");
1403 MODULE_DESCRIPTION("Silabs SI1132 and SI1141/2/3/5/6/7 proximity, ambient light and UV index sensor driver");
1404 MODULE_LICENSE("GPL");