1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright 2021 Google LLC.
4 *
5 * Driver for Semtech's SX9324 capacitive proximity/button solution.
6 * Based on SX9324 driver and copy of datasheet at:
7 * https://edit.wpgdadawant.com/uploads/news_file/program/2019/30184/tech_files/program_30184_suggest_other_file.pdf
8 */
9
10 #include <linux/acpi.h>
11 #include <linux/bits.h>
12 #include <linux/bitfield.h>
13 #include <linux/delay.h>
14 #include <linux/i2c.h>
15 #include <linux/interrupt.h>
16 #include <linux/kernel.h>
17 #include <linux/log2.h>
18 #include <linux/mod_devicetable.h>
19 #include <linux/module.h>
20 #include <linux/pm.h>
21 #include <linux/property.h>
22 #include <linux/regmap.h>
23
24 #include <linux/iio/iio.h>
25
26 #include "sx_common.h"
27
28 /* Register definitions. */
29 #define SX9324_REG_IRQ_SRC SX_COMMON_REG_IRQ_SRC
30 #define SX9324_REG_STAT0 0x01
31 #define SX9324_REG_STAT1 0x02
32 #define SX9324_REG_STAT2 0x03
33 #define SX9324_REG_STAT2_COMPSTAT_MASK GENMASK(3, 0)
34 #define SX9324_REG_STAT3 0x04
35 #define SX9324_REG_IRQ_MSK 0x05
36 #define SX9324_CONVDONE_IRQ BIT(3)
37 #define SX9324_FAR_IRQ BIT(5)
38 #define SX9324_CLOSE_IRQ BIT(6)
39 #define SX9324_REG_IRQ_CFG0 0x06
40 #define SX9324_REG_IRQ_CFG1 0x07
41 #define SX9324_REG_IRQ_CFG1_FAILCOND 0x80
42 #define SX9324_REG_IRQ_CFG2 0x08
43
44 #define SX9324_REG_GNRL_CTRL0 0x10
45 #define SX9324_REG_GNRL_CTRL0_SCANPERIOD_MASK GENMASK(4, 0)
46 #define SX9324_REG_GNRL_CTRL0_SCANPERIOD_100MS 0x16
47 #define SX9324_REG_GNRL_CTRL1 0x11
48 #define SX9324_REG_GNRL_CTRL1_PHEN_MASK GENMASK(3, 0)
49 #define SX9324_REG_GNRL_CTRL1_PAUSECTRL 0x20
50
51 #define SX9324_REG_I2C_ADDR 0x14
52 #define SX9324_REG_CLK_SPRD 0x15
53
54 #define SX9324_REG_AFE_CTRL0 0x20
55 #define SX9324_REG_AFE_CTRL0_RINT_SHIFT 6
56 #define SX9324_REG_AFE_CTRL0_RINT_MASK \
57 GENMASK(SX9324_REG_AFE_CTRL0_RINT_SHIFT + 1, \
58 SX9324_REG_AFE_CTRL0_RINT_SHIFT)
59 #define SX9324_REG_AFE_CTRL0_RINT_LOWEST 0x00
60 #define SX9324_REG_AFE_CTRL0_CSIDLE_SHIFT 4
61 #define SX9324_REG_AFE_CTRL0_CSIDLE_MASK \
62 GENMASK(SX9324_REG_AFE_CTRL0_CSIDLE_SHIFT + 1, \
63 SX9324_REG_AFE_CTRL0_CSIDLE_SHIFT)
64 #define SX9324_REG_AFE_CTRL0_RINT_LOWEST 0x00
65 #define SX9324_REG_AFE_CTRL1 0x21
66 #define SX9324_REG_AFE_CTRL2 0x22
67 #define SX9324_REG_AFE_CTRL3 0x23
68 #define SX9324_REG_AFE_CTRL4 0x24
69 #define SX9324_REG_AFE_CTRL4_FREQ_83_33HZ 0x40
70 #define SX9324_REG_AFE_CTRL4_RESOLUTION_MASK GENMASK(2, 0)
71 #define SX9324_REG_AFE_CTRL4_RES_100 0x04
72 #define SX9324_REG_AFE_CTRL5 0x25
73 #define SX9324_REG_AFE_CTRL6 0x26
74 #define SX9324_REG_AFE_CTRL7 0x27
75 #define SX9324_REG_AFE_PH0 0x28
76 #define SX9324_REG_AFE_PH0_PIN_MASK(_pin) \
77 GENMASK(2 * (_pin) + 1, 2 * (_pin))
78
79 #define SX9324_REG_AFE_PH1 0x29
80 #define SX9324_REG_AFE_PH2 0x2a
81 #define SX9324_REG_AFE_PH3 0x2b
82 #define SX9324_REG_AFE_CTRL8 0x2c
83 #define SX9324_REG_AFE_CTRL8_RESERVED 0x10
84 #define SX9324_REG_AFE_CTRL8_RESFILTIN_4KOHM 0x02
85 #define SX9324_REG_AFE_CTRL8_RESFILTIN_MASK GENMASK(3, 0)
86 #define SX9324_REG_AFE_CTRL9 0x2d
87 #define SX9324_REG_AFE_CTRL9_AGAIN_MASK GENMASK(3, 0)
88 #define SX9324_REG_AFE_CTRL9_AGAIN_1 0x08
89
90 #define SX9324_REG_PROX_CTRL0 0x30
91 #define SX9324_REG_PROX_CTRL0_GAIN_MASK GENMASK(5, 3)
92 #define SX9324_REG_PROX_CTRL0_GAIN_SHIFT 3
93 #define SX9324_REG_PROX_CTRL0_GAIN_RSVD 0x0
94 #define SX9324_REG_PROX_CTRL0_GAIN_1 0x1
95 #define SX9324_REG_PROX_CTRL0_GAIN_8 0x4
96 #define SX9324_REG_PROX_CTRL0_RAWFILT_MASK GENMASK(2, 0)
97 #define SX9324_REG_PROX_CTRL0_RAWFILT_1P50 0x01
98 #define SX9324_REG_PROX_CTRL1 0x31
99 #define SX9324_REG_PROX_CTRL2 0x32
100 #define SX9324_REG_PROX_CTRL2_AVGNEG_THRESH_16K 0x20
101 #define SX9324_REG_PROX_CTRL3 0x33
102 #define SX9324_REG_PROX_CTRL3_AVGDEB_2SAMPLES 0x40
103 #define SX9324_REG_PROX_CTRL3_AVGPOS_THRESH_16K 0x20
104 #define SX9324_REG_PROX_CTRL4 0x34
105 #define SX9324_REG_PROX_CTRL4_AVGNEGFILT_MASK GENMASK(5, 3)
106 #define SX9324_REG_PROX_CTRL4_AVGNEG_FILT_2 0x08
107 #define SX9324_REG_PROX_CTRL4_AVGPOSFILT_MASK GENMASK(2, 0)
108 #define SX9324_REG_PROX_CTRL4_AVGPOS_FILT_256 0x04
109 #define SX9324_REG_PROX_CTRL5 0x35
110 #define SX9324_REG_PROX_CTRL5_HYST_MASK GENMASK(5, 4)
111 #define SX9324_REG_PROX_CTRL5_CLOSE_DEBOUNCE_MASK GENMASK(3, 2)
112 #define SX9324_REG_PROX_CTRL5_FAR_DEBOUNCE_MASK GENMASK(1, 0)
113 #define SX9324_REG_PROX_CTRL6 0x36
114 #define SX9324_REG_PROX_CTRL6_PROXTHRESH_32 0x08
115 #define SX9324_REG_PROX_CTRL7 0x37
116
117 #define SX9324_REG_ADV_CTRL0 0x40
118 #define SX9324_REG_ADV_CTRL1 0x41
119 #define SX9324_REG_ADV_CTRL2 0x42
120 #define SX9324_REG_ADV_CTRL3 0x43
121 #define SX9324_REG_ADV_CTRL4 0x44
122 #define SX9324_REG_ADV_CTRL5 0x45
123 #define SX9324_REG_ADV_CTRL5_STARTUPSENS_MASK GENMASK(3, 2)
124 #define SX9324_REG_ADV_CTRL5_STARTUP_SENSOR_1 0x04
125 #define SX9324_REG_ADV_CTRL5_STARTUP_METHOD_1 0x01
126 #define SX9324_REG_ADV_CTRL6 0x46
127 #define SX9324_REG_ADV_CTRL7 0x47
128 #define SX9324_REG_ADV_CTRL8 0x48
129 #define SX9324_REG_ADV_CTRL9 0x49
130 #define SX9324_REG_ADV_CTRL10 0x4a
131 #define SX9324_REG_ADV_CTRL11 0x4b
132 #define SX9324_REG_ADV_CTRL12 0x4c
133 #define SX9324_REG_ADV_CTRL13 0x4d
134 #define SX9324_REG_ADV_CTRL14 0x4e
135 #define SX9324_REG_ADV_CTRL15 0x4f
136 #define SX9324_REG_ADV_CTRL16 0x50
137 #define SX9324_REG_ADV_CTRL17 0x51
138 #define SX9324_REG_ADV_CTRL18 0x52
139 #define SX9324_REG_ADV_CTRL19 0x53
140 #define SX9324_REG_ADV_CTRL20 0x54
141 #define SX9324_REG_ADV_CTRL19_HIGHT_FAILURE_THRESH_SATURATION 0xf0
142
143 #define SX9324_REG_PHASE_SEL 0x60
144
145 #define SX9324_REG_USEFUL_MSB 0x61
146 #define SX9324_REG_USEFUL_LSB 0x62
147
148 #define SX9324_REG_AVG_MSB 0x63
149 #define SX9324_REG_AVG_LSB 0x64
150
151 #define SX9324_REG_DIFF_MSB 0x65
152 #define SX9324_REG_DIFF_LSB 0x66
153
154 #define SX9324_REG_OFFSET_MSB 0x67
155 #define SX9324_REG_OFFSET_LSB 0x68
156
157 #define SX9324_REG_SAR_MSB 0x69
158 #define SX9324_REG_SAR_LSB 0x6a
159
160 #define SX9324_REG_RESET 0x9f
161 /* Write this to REG_RESET to do a soft reset. */
162 #define SX9324_SOFT_RESET 0xde
163
164 #define SX9324_REG_WHOAMI 0xfa
165 #define SX9324_WHOAMI_VALUE 0x23
166
167 #define SX9324_REG_REVISION 0xfe
168
169 /* 4 channels, as defined in STAT0: PH0, PH1, PH2 and PH3. */
170 #define SX9324_NUM_CHANNELS 4
171 /* 3 CS pins: CS0, CS1, CS2. */
172 #define SX9324_NUM_PINS 3
173
174 static const char * const sx9324_cs_pin_usage[] = { "HZ", "MI", "DS", "GD" };
175
sx9324_phase_configuration_show(struct iio_dev * indio_dev,uintptr_t private,const struct iio_chan_spec * chan,char * buf)176 static ssize_t sx9324_phase_configuration_show(struct iio_dev *indio_dev,
177 uintptr_t private,
178 const struct iio_chan_spec *chan,
179 char *buf)
180 {
181 struct sx_common_data *data = iio_priv(indio_dev);
182 unsigned int val;
183 int i, ret, pin_idx;
184 size_t len = 0;
185
186 ret = regmap_read(data->regmap, SX9324_REG_AFE_PH0 + chan->channel, &val);
187 if (ret < 0)
188 return ret;
189
190 for (i = 0; i < SX9324_NUM_PINS; i++) {
191 pin_idx = (val & SX9324_REG_AFE_PH0_PIN_MASK(i)) >> (2 * i);
192 len += sysfs_emit_at(buf, len, "%s,",
193 sx9324_cs_pin_usage[pin_idx]);
194 }
195 buf[len - 1] = '\n';
196 return len;
197 }
198
199 static const struct iio_chan_spec_ext_info sx9324_channel_ext_info[] = {
200 {
201 .name = "setup",
202 .shared = IIO_SEPARATE,
203 .read = sx9324_phase_configuration_show,
204 },
205 {}
206 };
207
208 #define SX9324_CHANNEL(idx) \
209 { \
210 .type = IIO_PROXIMITY, \
211 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
212 BIT(IIO_CHAN_INFO_HARDWAREGAIN), \
213 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
214 .info_mask_separate_available = \
215 BIT(IIO_CHAN_INFO_HARDWAREGAIN), \
216 .info_mask_shared_by_all_available = \
217 BIT(IIO_CHAN_INFO_SAMP_FREQ), \
218 .indexed = 1, \
219 .channel = idx, \
220 .address = SX9324_REG_DIFF_MSB, \
221 .event_spec = sx_common_events, \
222 .num_event_specs = ARRAY_SIZE(sx_common_events), \
223 .scan_index = idx, \
224 .scan_type = { \
225 .sign = 's', \
226 .realbits = 12, \
227 .storagebits = 16, \
228 .endianness = IIO_BE, \
229 }, \
230 .ext_info = sx9324_channel_ext_info, \
231 }
232
233 static const struct iio_chan_spec sx9324_channels[] = {
234 SX9324_CHANNEL(0), /* Phase 0 */
235 SX9324_CHANNEL(1), /* Phase 1 */
236 SX9324_CHANNEL(2), /* Phase 2 */
237 SX9324_CHANNEL(3), /* Phase 3 */
238 IIO_CHAN_SOFT_TIMESTAMP(4),
239 };
240
241 /*
242 * Each entry contains the integer part (val) and the fractional part, in micro
243 * seconds. It conforms to the IIO output IIO_VAL_INT_PLUS_MICRO.
244 */
245 static const struct {
246 int val;
247 int val2;
248 } sx9324_samp_freq_table[] = {
249 { 1000, 0 }, /* 00000: Min (no idle time) */
250 { 500, 0 }, /* 00001: 2 ms */
251 { 250, 0 }, /* 00010: 4 ms */
252 { 166, 666666 }, /* 00011: 6 ms */
253 { 125, 0 }, /* 00100: 8 ms */
254 { 100, 0 }, /* 00101: 10 ms */
255 { 71, 428571 }, /* 00110: 14 ms */
256 { 55, 555556 }, /* 00111: 18 ms */
257 { 45, 454545 }, /* 01000: 22 ms */
258 { 38, 461538 }, /* 01001: 26 ms */
259 { 33, 333333 }, /* 01010: 30 ms */
260 { 29, 411765 }, /* 01011: 34 ms */
261 { 26, 315789 }, /* 01100: 38 ms */
262 { 23, 809524 }, /* 01101: 42 ms */
263 { 21, 739130 }, /* 01110: 46 ms */
264 { 20, 0 }, /* 01111: 50 ms */
265 { 17, 857143 }, /* 10000: 56 ms */
266 { 16, 129032 }, /* 10001: 62 ms */
267 { 14, 705882 }, /* 10010: 68 ms */
268 { 13, 513514 }, /* 10011: 74 ms */
269 { 12, 500000 }, /* 10100: 80 ms */
270 { 11, 111111 }, /* 10101: 90 ms */
271 { 10, 0 }, /* 10110: 100 ms (Typ.) */
272 { 5, 0 }, /* 10111: 200 ms */
273 { 3, 333333 }, /* 11000: 300 ms */
274 { 2, 500000 }, /* 11001: 400 ms */
275 { 1, 666667 }, /* 11010: 600 ms */
276 { 1, 250000 }, /* 11011: 800 ms */
277 { 1, 0 }, /* 11100: 1 s */
278 { 0, 500000 }, /* 11101: 2 s */
279 { 0, 333333 }, /* 11110: 3 s */
280 { 0, 250000 }, /* 11111: 4 s */
281 };
282
283 static const unsigned int sx9324_scan_period_table[] = {
284 2, 15, 30, 45, 60, 90, 120, 200,
285 400, 600, 800, 1000, 2000, 3000, 4000, 5000,
286 };
287
288 static const struct regmap_range sx9324_writable_reg_ranges[] = {
289 /*
290 * To set COMPSTAT for compensation, even if datasheet says register is
291 * RO.
292 */
293 regmap_reg_range(SX9324_REG_STAT2, SX9324_REG_STAT2),
294 regmap_reg_range(SX9324_REG_IRQ_MSK, SX9324_REG_IRQ_CFG2),
295 regmap_reg_range(SX9324_REG_GNRL_CTRL0, SX9324_REG_GNRL_CTRL1),
296 /* Leave i2c and clock spreading as unavailable */
297 regmap_reg_range(SX9324_REG_AFE_CTRL0, SX9324_REG_AFE_CTRL9),
298 regmap_reg_range(SX9324_REG_PROX_CTRL0, SX9324_REG_PROX_CTRL7),
299 regmap_reg_range(SX9324_REG_ADV_CTRL0, SX9324_REG_ADV_CTRL20),
300 regmap_reg_range(SX9324_REG_PHASE_SEL, SX9324_REG_PHASE_SEL),
301 regmap_reg_range(SX9324_REG_OFFSET_MSB, SX9324_REG_OFFSET_LSB),
302 regmap_reg_range(SX9324_REG_RESET, SX9324_REG_RESET),
303 };
304
305 static const struct regmap_access_table sx9324_writeable_regs = {
306 .yes_ranges = sx9324_writable_reg_ranges,
307 .n_yes_ranges = ARRAY_SIZE(sx9324_writable_reg_ranges),
308 };
309
310 /*
311 * All allocated registers are readable, so we just list unallocated
312 * ones.
313 */
314 static const struct regmap_range sx9324_non_readable_reg_ranges[] = {
315 regmap_reg_range(SX9324_REG_IRQ_CFG2 + 1, SX9324_REG_GNRL_CTRL0 - 1),
316 regmap_reg_range(SX9324_REG_GNRL_CTRL1 + 1, SX9324_REG_AFE_CTRL0 - 1),
317 regmap_reg_range(SX9324_REG_AFE_CTRL9 + 1, SX9324_REG_PROX_CTRL0 - 1),
318 regmap_reg_range(SX9324_REG_PROX_CTRL7 + 1, SX9324_REG_ADV_CTRL0 - 1),
319 regmap_reg_range(SX9324_REG_ADV_CTRL20 + 1, SX9324_REG_PHASE_SEL - 1),
320 regmap_reg_range(SX9324_REG_SAR_LSB + 1, SX9324_REG_RESET - 1),
321 regmap_reg_range(SX9324_REG_RESET + 1, SX9324_REG_WHOAMI - 1),
322 regmap_reg_range(SX9324_REG_WHOAMI + 1, SX9324_REG_REVISION - 1),
323 };
324
325 static const struct regmap_access_table sx9324_readable_regs = {
326 .no_ranges = sx9324_non_readable_reg_ranges,
327 .n_no_ranges = ARRAY_SIZE(sx9324_non_readable_reg_ranges),
328 };
329
330 static const struct regmap_range sx9324_volatile_reg_ranges[] = {
331 regmap_reg_range(SX9324_REG_IRQ_SRC, SX9324_REG_STAT3),
332 regmap_reg_range(SX9324_REG_USEFUL_MSB, SX9324_REG_DIFF_LSB),
333 regmap_reg_range(SX9324_REG_SAR_MSB, SX9324_REG_SAR_LSB),
334 regmap_reg_range(SX9324_REG_WHOAMI, SX9324_REG_WHOAMI),
335 regmap_reg_range(SX9324_REG_REVISION, SX9324_REG_REVISION),
336 };
337
338 static const struct regmap_access_table sx9324_volatile_regs = {
339 .yes_ranges = sx9324_volatile_reg_ranges,
340 .n_yes_ranges = ARRAY_SIZE(sx9324_volatile_reg_ranges),
341 };
342
343 static const struct regmap_config sx9324_regmap_config = {
344 .reg_bits = 8,
345 .val_bits = 8,
346
347 .max_register = SX9324_REG_REVISION,
348 .cache_type = REGCACHE_RBTREE,
349
350 .wr_table = &sx9324_writeable_regs,
351 .rd_table = &sx9324_readable_regs,
352 .volatile_table = &sx9324_volatile_regs,
353 };
354
sx9324_read_prox_data(struct sx_common_data * data,const struct iio_chan_spec * chan,__be16 * val)355 static int sx9324_read_prox_data(struct sx_common_data *data,
356 const struct iio_chan_spec *chan,
357 __be16 *val)
358 {
359 int ret;
360
361 ret = regmap_write(data->regmap, SX9324_REG_PHASE_SEL, chan->channel);
362 if (ret < 0)
363 return ret;
364
365 return regmap_bulk_read(data->regmap, chan->address, val, sizeof(*val));
366 }
367
368 /*
369 * If we have no interrupt support, we have to wait for a scan period
370 * after enabling a channel to get a result.
371 */
sx9324_wait_for_sample(struct sx_common_data * data)372 static int sx9324_wait_for_sample(struct sx_common_data *data)
373 {
374 int ret;
375 unsigned int val;
376
377 ret = regmap_read(data->regmap, SX9324_REG_GNRL_CTRL0, &val);
378 if (ret < 0)
379 return ret;
380 val = FIELD_GET(SX9324_REG_GNRL_CTRL0_SCANPERIOD_MASK, val);
381
382 msleep(sx9324_scan_period_table[val]);
383
384 return 0;
385 }
386
sx9324_read_gain(struct sx_common_data * data,const struct iio_chan_spec * chan,int * val)387 static int sx9324_read_gain(struct sx_common_data *data,
388 const struct iio_chan_spec *chan, int *val)
389 {
390 unsigned int reg, regval;
391 int ret;
392
393 reg = SX9324_REG_PROX_CTRL0 + chan->channel / 2;
394 ret = regmap_read(data->regmap, reg, ®val);
395 if (ret)
396 return ret;
397
398 regval = FIELD_GET(SX9324_REG_PROX_CTRL0_GAIN_MASK, regval);
399 if (regval)
400 regval--;
401 else if (regval == SX9324_REG_PROX_CTRL0_GAIN_RSVD ||
402 regval > SX9324_REG_PROX_CTRL0_GAIN_8)
403 return -EINVAL;
404
405 *val = 1 << regval;
406
407 return IIO_VAL_INT;
408 }
409
sx9324_read_samp_freq(struct sx_common_data * data,int * val,int * val2)410 static int sx9324_read_samp_freq(struct sx_common_data *data,
411 int *val, int *val2)
412 {
413 int ret;
414 unsigned int regval;
415
416 ret = regmap_read(data->regmap, SX9324_REG_GNRL_CTRL0, ®val);
417 if (ret)
418 return ret;
419
420 regval = FIELD_GET(SX9324_REG_GNRL_CTRL0_SCANPERIOD_MASK, regval);
421 *val = sx9324_samp_freq_table[regval].val;
422 *val2 = sx9324_samp_freq_table[regval].val2;
423
424 return IIO_VAL_INT_PLUS_MICRO;
425 }
426
sx9324_read_raw(struct iio_dev * indio_dev,const struct iio_chan_spec * chan,int * val,int * val2,long mask)427 static int sx9324_read_raw(struct iio_dev *indio_dev,
428 const struct iio_chan_spec *chan,
429 int *val, int *val2, long mask)
430 {
431 struct sx_common_data *data = iio_priv(indio_dev);
432
433 switch (mask) {
434 case IIO_CHAN_INFO_RAW:
435 iio_device_claim_direct_scoped(return -EBUSY, indio_dev)
436 return sx_common_read_proximity(data, chan, val);
437 unreachable();
438 case IIO_CHAN_INFO_HARDWAREGAIN:
439 iio_device_claim_direct_scoped(return -EBUSY, indio_dev)
440 return sx9324_read_gain(data, chan, val);
441 unreachable();
442 case IIO_CHAN_INFO_SAMP_FREQ:
443 return sx9324_read_samp_freq(data, val, val2);
444 default:
445 return -EINVAL;
446 }
447 }
448
449 static const int sx9324_gain_vals[] = { 1, 2, 4, 8 };
450
sx9324_read_avail(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,const int ** vals,int * type,int * length,long mask)451 static int sx9324_read_avail(struct iio_dev *indio_dev,
452 struct iio_chan_spec const *chan,
453 const int **vals, int *type, int *length,
454 long mask)
455 {
456 if (chan->type != IIO_PROXIMITY)
457 return -EINVAL;
458
459 switch (mask) {
460 case IIO_CHAN_INFO_HARDWAREGAIN:
461 *type = IIO_VAL_INT;
462 *length = ARRAY_SIZE(sx9324_gain_vals);
463 *vals = sx9324_gain_vals;
464 return IIO_AVAIL_LIST;
465 case IIO_CHAN_INFO_SAMP_FREQ:
466 *type = IIO_VAL_INT_PLUS_MICRO;
467 *length = ARRAY_SIZE(sx9324_samp_freq_table) * 2;
468 *vals = (int *)sx9324_samp_freq_table;
469 return IIO_AVAIL_LIST;
470 default:
471 return -EINVAL;
472 }
473 }
474
sx9324_set_samp_freq(struct sx_common_data * data,int val,int val2)475 static int sx9324_set_samp_freq(struct sx_common_data *data,
476 int val, int val2)
477 {
478 int i;
479
480 for (i = 0; i < ARRAY_SIZE(sx9324_samp_freq_table); i++)
481 if (val == sx9324_samp_freq_table[i].val &&
482 val2 == sx9324_samp_freq_table[i].val2)
483 break;
484
485 if (i == ARRAY_SIZE(sx9324_samp_freq_table))
486 return -EINVAL;
487
488 guard(mutex)(&data->mutex);
489
490 return regmap_update_bits(data->regmap,
491 SX9324_REG_GNRL_CTRL0,
492 SX9324_REG_GNRL_CTRL0_SCANPERIOD_MASK, i);
493 }
494
sx9324_read_thresh(struct sx_common_data * data,const struct iio_chan_spec * chan,int * val)495 static int sx9324_read_thresh(struct sx_common_data *data,
496 const struct iio_chan_spec *chan, int *val)
497 {
498 unsigned int regval;
499 unsigned int reg;
500 int ret;
501
502 /*
503 * TODO(gwendal): Depending on the phase function
504 * (proximity/table/body), retrieve the right threshold.
505 * For now, return the proximity threshold.
506 */
507 reg = SX9324_REG_PROX_CTRL6 + chan->channel / 2;
508 ret = regmap_read(data->regmap, reg, ®val);
509 if (ret)
510 return ret;
511
512 if (regval <= 1)
513 *val = regval;
514 else
515 *val = (regval * regval) / 2;
516
517 return IIO_VAL_INT;
518 }
519
sx9324_read_hysteresis(struct sx_common_data * data,const struct iio_chan_spec * chan,int * val)520 static int sx9324_read_hysteresis(struct sx_common_data *data,
521 const struct iio_chan_spec *chan, int *val)
522 {
523 unsigned int regval, pthresh;
524 int ret;
525
526 ret = sx9324_read_thresh(data, chan, &pthresh);
527 if (ret < 0)
528 return ret;
529
530 ret = regmap_read(data->regmap, SX9324_REG_PROX_CTRL5, ®val);
531 if (ret)
532 return ret;
533
534 regval = FIELD_GET(SX9324_REG_PROX_CTRL5_HYST_MASK, regval);
535 if (!regval)
536 *val = 0;
537 else
538 *val = pthresh >> (5 - regval);
539
540 return IIO_VAL_INT;
541 }
542
sx9324_read_far_debounce(struct sx_common_data * data,int * val)543 static int sx9324_read_far_debounce(struct sx_common_data *data, int *val)
544 {
545 unsigned int regval;
546 int ret;
547
548 ret = regmap_read(data->regmap, SX9324_REG_PROX_CTRL5, ®val);
549 if (ret)
550 return ret;
551
552 regval = FIELD_GET(SX9324_REG_PROX_CTRL5_FAR_DEBOUNCE_MASK, regval);
553 if (regval)
554 *val = 1 << regval;
555 else
556 *val = 0;
557
558 return IIO_VAL_INT;
559 }
560
sx9324_read_close_debounce(struct sx_common_data * data,int * val)561 static int sx9324_read_close_debounce(struct sx_common_data *data, int *val)
562 {
563 unsigned int regval;
564 int ret;
565
566 ret = regmap_read(data->regmap, SX9324_REG_PROX_CTRL5, ®val);
567 if (ret)
568 return ret;
569
570 regval = FIELD_GET(SX9324_REG_PROX_CTRL5_CLOSE_DEBOUNCE_MASK, regval);
571 if (regval)
572 *val = 1 << regval;
573 else
574 *val = 0;
575
576 return IIO_VAL_INT;
577 }
578
sx9324_read_event_val(struct iio_dev * indio_dev,const struct iio_chan_spec * chan,enum iio_event_type type,enum iio_event_direction dir,enum iio_event_info info,int * val,int * val2)579 static int sx9324_read_event_val(struct iio_dev *indio_dev,
580 const struct iio_chan_spec *chan,
581 enum iio_event_type type,
582 enum iio_event_direction dir,
583 enum iio_event_info info, int *val, int *val2)
584 {
585 struct sx_common_data *data = iio_priv(indio_dev);
586
587 if (chan->type != IIO_PROXIMITY)
588 return -EINVAL;
589
590 switch (info) {
591 case IIO_EV_INFO_VALUE:
592 return sx9324_read_thresh(data, chan, val);
593 case IIO_EV_INFO_PERIOD:
594 switch (dir) {
595 case IIO_EV_DIR_RISING:
596 return sx9324_read_far_debounce(data, val);
597 case IIO_EV_DIR_FALLING:
598 return sx9324_read_close_debounce(data, val);
599 default:
600 return -EINVAL;
601 }
602 case IIO_EV_INFO_HYSTERESIS:
603 return sx9324_read_hysteresis(data, chan, val);
604 default:
605 return -EINVAL;
606 }
607 }
608
sx9324_write_thresh(struct sx_common_data * data,const struct iio_chan_spec * chan,int _val)609 static int sx9324_write_thresh(struct sx_common_data *data,
610 const struct iio_chan_spec *chan, int _val)
611 {
612 unsigned int reg, val = _val;
613
614 reg = SX9324_REG_PROX_CTRL6 + chan->channel / 2;
615
616 if (val >= 1)
617 val = int_sqrt(2 * val);
618
619 if (val > 0xff)
620 return -EINVAL;
621
622 guard(mutex)(&data->mutex);
623
624 return regmap_write(data->regmap, reg, val);
625 }
626
sx9324_write_hysteresis(struct sx_common_data * data,const struct iio_chan_spec * chan,int _val)627 static int sx9324_write_hysteresis(struct sx_common_data *data,
628 const struct iio_chan_spec *chan, int _val)
629 {
630 unsigned int hyst, val = _val;
631 int ret, pthresh;
632
633 ret = sx9324_read_thresh(data, chan, &pthresh);
634 if (ret < 0)
635 return ret;
636
637 if (val == 0)
638 hyst = 0;
639 else if (val >= pthresh >> 2)
640 hyst = 3;
641 else if (val >= pthresh >> 3)
642 hyst = 2;
643 else if (val >= pthresh >> 4)
644 hyst = 1;
645 else
646 return -EINVAL;
647
648 hyst = FIELD_PREP(SX9324_REG_PROX_CTRL5_HYST_MASK, hyst);
649 guard(mutex)(&data->mutex);
650
651 return regmap_update_bits(data->regmap, SX9324_REG_PROX_CTRL5,
652 SX9324_REG_PROX_CTRL5_HYST_MASK, hyst);
653 }
654
sx9324_write_far_debounce(struct sx_common_data * data,int _val)655 static int sx9324_write_far_debounce(struct sx_common_data *data, int _val)
656 {
657 unsigned int regval, val = _val;
658
659 if (val > 0)
660 val = ilog2(val);
661 if (!FIELD_FIT(SX9324_REG_PROX_CTRL5_FAR_DEBOUNCE_MASK, val))
662 return -EINVAL;
663
664 regval = FIELD_PREP(SX9324_REG_PROX_CTRL5_FAR_DEBOUNCE_MASK, val);
665
666 guard(mutex)(&data->mutex);
667
668 return regmap_update_bits(data->regmap, SX9324_REG_PROX_CTRL5,
669 SX9324_REG_PROX_CTRL5_FAR_DEBOUNCE_MASK,
670 regval);
671 }
672
sx9324_write_close_debounce(struct sx_common_data * data,int _val)673 static int sx9324_write_close_debounce(struct sx_common_data *data, int _val)
674 {
675 unsigned int regval, val = _val;
676
677 if (val > 0)
678 val = ilog2(val);
679 if (!FIELD_FIT(SX9324_REG_PROX_CTRL5_CLOSE_DEBOUNCE_MASK, val))
680 return -EINVAL;
681
682 regval = FIELD_PREP(SX9324_REG_PROX_CTRL5_CLOSE_DEBOUNCE_MASK, val);
683
684 guard(mutex)(&data->mutex);
685
686 return regmap_update_bits(data->regmap, SX9324_REG_PROX_CTRL5,
687 SX9324_REG_PROX_CTRL5_CLOSE_DEBOUNCE_MASK,
688 regval);
689 }
690
sx9324_write_event_val(struct iio_dev * indio_dev,const struct iio_chan_spec * chan,enum iio_event_type type,enum iio_event_direction dir,enum iio_event_info info,int val,int val2)691 static int sx9324_write_event_val(struct iio_dev *indio_dev,
692 const struct iio_chan_spec *chan,
693 enum iio_event_type type,
694 enum iio_event_direction dir,
695 enum iio_event_info info, int val, int val2)
696 {
697 struct sx_common_data *data = iio_priv(indio_dev);
698
699 if (chan->type != IIO_PROXIMITY)
700 return -EINVAL;
701
702 switch (info) {
703 case IIO_EV_INFO_VALUE:
704 return sx9324_write_thresh(data, chan, val);
705 case IIO_EV_INFO_PERIOD:
706 switch (dir) {
707 case IIO_EV_DIR_RISING:
708 return sx9324_write_far_debounce(data, val);
709 case IIO_EV_DIR_FALLING:
710 return sx9324_write_close_debounce(data, val);
711 default:
712 return -EINVAL;
713 }
714 case IIO_EV_INFO_HYSTERESIS:
715 return sx9324_write_hysteresis(data, chan, val);
716 default:
717 return -EINVAL;
718 }
719 }
720
sx9324_write_gain(struct sx_common_data * data,const struct iio_chan_spec * chan,int val)721 static int sx9324_write_gain(struct sx_common_data *data,
722 const struct iio_chan_spec *chan, int val)
723 {
724 unsigned int gain, reg;
725
726 reg = SX9324_REG_PROX_CTRL0 + chan->channel / 2;
727
728 gain = ilog2(val) + 1;
729 if (val <= 0 || gain > SX9324_REG_PROX_CTRL0_GAIN_8)
730 return -EINVAL;
731
732 gain = FIELD_PREP(SX9324_REG_PROX_CTRL0_GAIN_MASK, gain);
733
734 guard(mutex)(&data->mutex);
735
736 return regmap_update_bits(data->regmap, reg,
737 SX9324_REG_PROX_CTRL0_GAIN_MASK,
738 gain);
739 }
740
sx9324_write_raw(struct iio_dev * indio_dev,const struct iio_chan_spec * chan,int val,int val2,long mask)741 static int sx9324_write_raw(struct iio_dev *indio_dev,
742 const struct iio_chan_spec *chan, int val, int val2,
743 long mask)
744 {
745 struct sx_common_data *data = iio_priv(indio_dev);
746
747 switch (mask) {
748 case IIO_CHAN_INFO_SAMP_FREQ:
749 return sx9324_set_samp_freq(data, val, val2);
750 case IIO_CHAN_INFO_HARDWAREGAIN:
751 return sx9324_write_gain(data, chan, val);
752 default:
753 return -EINVAL;
754 }
755 }
756
757 static const struct sx_common_reg_default sx9324_default_regs[] = {
758 { SX9324_REG_IRQ_MSK, 0x00 },
759 { SX9324_REG_IRQ_CFG0, 0x00, "irq_cfg0" },
760 { SX9324_REG_IRQ_CFG1, SX9324_REG_IRQ_CFG1_FAILCOND, "irq_cfg1" },
761 { SX9324_REG_IRQ_CFG2, 0x00, "irq_cfg2" },
762 { SX9324_REG_GNRL_CTRL0, SX9324_REG_GNRL_CTRL0_SCANPERIOD_100MS, "gnrl_ctrl0" },
763 /*
764 * The lower 4 bits should not be set as it enable sensors measurements.
765 * Turning the detection on before the configuration values are set to
766 * good values can cause the device to return erroneous readings.
767 */
768 { SX9324_REG_GNRL_CTRL1, SX9324_REG_GNRL_CTRL1_PAUSECTRL, "gnrl_ctrl1" },
769
770 { SX9324_REG_AFE_CTRL0, SX9324_REG_AFE_CTRL0_RINT_LOWEST, "afe_ctrl0" },
771 { SX9324_REG_AFE_CTRL3, 0x00, "afe_ctrl3" },
772 { SX9324_REG_AFE_CTRL4, SX9324_REG_AFE_CTRL4_FREQ_83_33HZ |
773 SX9324_REG_AFE_CTRL4_RES_100, "afe_ctrl4" },
774 { SX9324_REG_AFE_CTRL6, 0x00, "afe_ctrl6" },
775 { SX9324_REG_AFE_CTRL7, SX9324_REG_AFE_CTRL4_FREQ_83_33HZ |
776 SX9324_REG_AFE_CTRL4_RES_100, "afe_ctrl7" },
777
778 /* TODO(gwendal): PHx use chip default or all grounded? */
779 { SX9324_REG_AFE_PH0, 0x29, "afe_ph0" },
780 { SX9324_REG_AFE_PH1, 0x26, "afe_ph1" },
781 { SX9324_REG_AFE_PH2, 0x1a, "afe_ph2" },
782 { SX9324_REG_AFE_PH3, 0x16, "afe_ph3" },
783
784 { SX9324_REG_AFE_CTRL8, SX9324_REG_AFE_CTRL8_RESERVED |
785 SX9324_REG_AFE_CTRL8_RESFILTIN_4KOHM, "afe_ctrl8" },
786 { SX9324_REG_AFE_CTRL9, SX9324_REG_AFE_CTRL9_AGAIN_1, "afe_ctrl9" },
787
788 { SX9324_REG_PROX_CTRL0,
789 SX9324_REG_PROX_CTRL0_GAIN_1 << SX9324_REG_PROX_CTRL0_GAIN_SHIFT |
790 SX9324_REG_PROX_CTRL0_RAWFILT_1P50, "prox_ctrl0" },
791 { SX9324_REG_PROX_CTRL1,
792 SX9324_REG_PROX_CTRL0_GAIN_1 << SX9324_REG_PROX_CTRL0_GAIN_SHIFT |
793 SX9324_REG_PROX_CTRL0_RAWFILT_1P50, "prox_ctrl1" },
794 { SX9324_REG_PROX_CTRL2, SX9324_REG_PROX_CTRL2_AVGNEG_THRESH_16K, "prox_ctrl2" },
795 { SX9324_REG_PROX_CTRL3, SX9324_REG_PROX_CTRL3_AVGDEB_2SAMPLES |
796 SX9324_REG_PROX_CTRL3_AVGPOS_THRESH_16K, "prox_ctrl3" },
797 { SX9324_REG_PROX_CTRL4, SX9324_REG_PROX_CTRL4_AVGNEG_FILT_2 |
798 SX9324_REG_PROX_CTRL4_AVGPOS_FILT_256, "prox_ctrl4" },
799 { SX9324_REG_PROX_CTRL5, 0x00, "prox_ctrl5" },
800 { SX9324_REG_PROX_CTRL6, SX9324_REG_PROX_CTRL6_PROXTHRESH_32, "prox_ctrl6" },
801 { SX9324_REG_PROX_CTRL7, SX9324_REG_PROX_CTRL6_PROXTHRESH_32, "prox_ctrl7" },
802 { SX9324_REG_ADV_CTRL0, 0x00, "adv_ctrl0" },
803 { SX9324_REG_ADV_CTRL1, 0x00, "adv_ctrl1" },
804 { SX9324_REG_ADV_CTRL2, 0x00, "adv_ctrl2" },
805 { SX9324_REG_ADV_CTRL3, 0x00, "adv_ctrl3" },
806 { SX9324_REG_ADV_CTRL4, 0x00, "adv_ctrl4" },
807 { SX9324_REG_ADV_CTRL5, SX9324_REG_ADV_CTRL5_STARTUP_SENSOR_1 |
808 SX9324_REG_ADV_CTRL5_STARTUP_METHOD_1, "adv_ctrl5" },
809 { SX9324_REG_ADV_CTRL6, 0x00, "adv_ctrl6" },
810 { SX9324_REG_ADV_CTRL7, 0x00, "adv_ctrl7" },
811 { SX9324_REG_ADV_CTRL8, 0x00, "adv_ctrl8" },
812 { SX9324_REG_ADV_CTRL9, 0x00, "adv_ctrl9" },
813 /* Body/Table threshold */
814 { SX9324_REG_ADV_CTRL10, 0x00, "adv_ctrl10" },
815 { SX9324_REG_ADV_CTRL11, 0x00, "adv_ctrl11" },
816 { SX9324_REG_ADV_CTRL12, 0x00, "adv_ctrl12" },
817 /* TODO(gwendal): SAR currenly disabled */
818 { SX9324_REG_ADV_CTRL13, 0x00, "adv_ctrl13" },
819 { SX9324_REG_ADV_CTRL14, 0x00, "adv_ctrl14" },
820 { SX9324_REG_ADV_CTRL15, 0x00, "adv_ctrl15" },
821 { SX9324_REG_ADV_CTRL16, 0x00, "adv_ctrl16" },
822 { SX9324_REG_ADV_CTRL17, 0x00, "adv_ctrl17" },
823 { SX9324_REG_ADV_CTRL18, 0x00, "adv_ctrl18" },
824 { SX9324_REG_ADV_CTRL19,
825 SX9324_REG_ADV_CTRL19_HIGHT_FAILURE_THRESH_SATURATION, "adv_ctrl19" },
826 { SX9324_REG_ADV_CTRL20,
827 SX9324_REG_ADV_CTRL19_HIGHT_FAILURE_THRESH_SATURATION, "adv_ctrl20" },
828 };
829
830 /* Activate all channels and perform an initial compensation. */
sx9324_init_compensation(struct iio_dev * indio_dev)831 static int sx9324_init_compensation(struct iio_dev *indio_dev)
832 {
833 struct sx_common_data *data = iio_priv(indio_dev);
834 unsigned int val;
835 int ret;
836
837 /* run the compensation phase on all channels */
838 ret = regmap_set_bits(data->regmap, SX9324_REG_STAT2,
839 SX9324_REG_STAT2_COMPSTAT_MASK);
840 if (ret)
841 return ret;
842
843 return regmap_read_poll_timeout(data->regmap, SX9324_REG_STAT2, val,
844 !(val & SX9324_REG_STAT2_COMPSTAT_MASK),
845 20000, 2000000);
846 }
847
sx9324_parse_phase_prop(struct device * dev,struct sx_common_reg_default * reg_def,const char * prop)848 static u8 sx9324_parse_phase_prop(struct device *dev,
849 struct sx_common_reg_default *reg_def,
850 const char *prop)
851 {
852 unsigned int pin_defs[SX9324_NUM_PINS];
853 int count, ret, pin;
854 u32 raw = 0;
855
856 count = device_property_count_u32(dev, prop);
857 if (count != ARRAY_SIZE(pin_defs))
858 return reg_def->def;
859 ret = device_property_read_u32_array(dev, prop, pin_defs,
860 ARRAY_SIZE(pin_defs));
861 if (ret)
862 return reg_def->def;
863
864 for (pin = 0; pin < SX9324_NUM_PINS; pin++)
865 raw |= (pin_defs[pin] << (2 * pin)) &
866 SX9324_REG_AFE_PH0_PIN_MASK(pin);
867
868 return raw;
869 }
870
sx_common_get_raw_register_config(struct device * dev,struct sx_common_reg_default * reg_def)871 static void sx_common_get_raw_register_config(struct device *dev,
872 struct sx_common_reg_default *reg_def)
873 {
874 #ifdef CONFIG_ACPI
875 struct acpi_device *adev = ACPI_COMPANION(dev);
876 u32 raw = 0, ret;
877 char prop[80];
878
879 if (!reg_def->property || !adev)
880 return;
881
882 snprintf(prop, ARRAY_SIZE(prop), "%s,reg_%s", acpi_device_hid(adev), reg_def->property);
883 ret = device_property_read_u32(dev, prop, &raw);
884 if (ret)
885 return;
886
887 reg_def->def = raw;
888 #endif
889 }
890
891 static const struct sx_common_reg_default *
sx9324_get_default_reg(struct device * dev,int idx,struct sx_common_reg_default * reg_def)892 sx9324_get_default_reg(struct device *dev, int idx,
893 struct sx_common_reg_default *reg_def)
894 {
895 static const char * const sx9324_rints[] = { "lowest", "low", "high",
896 "highest" };
897 static const char * const sx9324_csidle[] = { "hi-z", "hi-z", "gnd",
898 "vdd" };
899 u32 start = 0, raw = 0, pos = 0;
900 const char *prop;
901 int ret;
902
903 memcpy(reg_def, &sx9324_default_regs[idx], sizeof(*reg_def));
904
905 sx_common_get_raw_register_config(dev, reg_def);
906 switch (reg_def->reg) {
907 case SX9324_REG_AFE_PH0:
908 reg_def->def = sx9324_parse_phase_prop(dev, reg_def,
909 "semtech,ph0-pin");
910 break;
911 case SX9324_REG_AFE_PH1:
912 reg_def->def = sx9324_parse_phase_prop(dev, reg_def,
913 "semtech,ph1-pin");
914 break;
915 case SX9324_REG_AFE_PH2:
916 reg_def->def = sx9324_parse_phase_prop(dev, reg_def,
917 "semtech,ph2-pin");
918 break;
919 case SX9324_REG_AFE_PH3:
920 reg_def->def = sx9324_parse_phase_prop(dev, reg_def,
921 "semtech,ph3-pin");
922 break;
923 case SX9324_REG_AFE_CTRL0:
924 ret = device_property_match_property_string(dev, "semtech,cs-idle-sleep",
925 sx9324_csidle,
926 ARRAY_SIZE(sx9324_csidle));
927 if (ret >= 0) {
928 reg_def->def &= ~SX9324_REG_AFE_CTRL0_CSIDLE_MASK;
929 reg_def->def |= ret << SX9324_REG_AFE_CTRL0_CSIDLE_SHIFT;
930 }
931
932 ret = device_property_match_property_string(dev, "semtech,int-comp-resistor",
933 sx9324_rints,
934 ARRAY_SIZE(sx9324_rints));
935 if (ret >= 0) {
936 reg_def->def &= ~SX9324_REG_AFE_CTRL0_RINT_MASK;
937 reg_def->def |= ret << SX9324_REG_AFE_CTRL0_RINT_SHIFT;
938 }
939 break;
940 case SX9324_REG_AFE_CTRL4:
941 case SX9324_REG_AFE_CTRL7:
942 if (reg_def->reg == SX9324_REG_AFE_CTRL4)
943 prop = "semtech,ph01-resolution";
944 else
945 prop = "semtech,ph23-resolution";
946
947 ret = device_property_read_u32(dev, prop, &raw);
948 if (ret)
949 break;
950
951 raw = ilog2(raw) - 3;
952
953 reg_def->def &= ~SX9324_REG_AFE_CTRL4_RESOLUTION_MASK;
954 reg_def->def |= FIELD_PREP(SX9324_REG_AFE_CTRL4_RESOLUTION_MASK,
955 raw);
956 break;
957 case SX9324_REG_AFE_CTRL8:
958 ret = device_property_read_u32(dev,
959 "semtech,input-precharge-resistor-ohms",
960 &raw);
961 if (ret)
962 break;
963
964 reg_def->def &= ~SX9324_REG_AFE_CTRL8_RESFILTIN_MASK;
965 reg_def->def |= FIELD_PREP(SX9324_REG_AFE_CTRL8_RESFILTIN_MASK,
966 raw / 2000);
967 break;
968
969 case SX9324_REG_AFE_CTRL9:
970 ret = device_property_read_u32(dev,
971 "semtech,input-analog-gain", &raw);
972 if (ret)
973 break;
974 /*
975 * The analog gain has the following setting:
976 * +---------+----------------+----------------+
977 * | dt(raw) | physical value | register value |
978 * +---------+----------------+----------------+
979 * | 0 | x1.247 | 6 |
980 * | 1 | x1 | 8 |
981 * | 2 | x0.768 | 11 |
982 * | 3 | x0.552 | 15 |
983 * +---------+----------------+----------------+
984 */
985 reg_def->def &= ~SX9324_REG_AFE_CTRL9_AGAIN_MASK;
986 reg_def->def |= FIELD_PREP(SX9324_REG_AFE_CTRL9_AGAIN_MASK,
987 6 + raw * (raw + 3) / 2);
988 break;
989
990 case SX9324_REG_ADV_CTRL5:
991 ret = device_property_read_u32(dev, "semtech,startup-sensor",
992 &start);
993 if (ret)
994 break;
995
996 reg_def->def &= ~SX9324_REG_ADV_CTRL5_STARTUPSENS_MASK;
997 reg_def->def |= FIELD_PREP(SX9324_REG_ADV_CTRL5_STARTUPSENS_MASK,
998 start);
999 break;
1000 case SX9324_REG_PROX_CTRL4:
1001 ret = device_property_read_u32(dev, "semtech,avg-pos-strength",
1002 &pos);
1003 if (ret)
1004 break;
1005
1006 /* Powers of 2, except for a gap between 16 and 64 */
1007 raw = clamp(ilog2(pos), 3, 11) - (pos >= 32 ? 4 : 3);
1008
1009 reg_def->def &= ~SX9324_REG_PROX_CTRL4_AVGPOSFILT_MASK;
1010 reg_def->def |= FIELD_PREP(SX9324_REG_PROX_CTRL4_AVGPOSFILT_MASK,
1011 raw);
1012 break;
1013 case SX9324_REG_PROX_CTRL0:
1014 case SX9324_REG_PROX_CTRL1:
1015 if (reg_def->reg == SX9324_REG_PROX_CTRL0)
1016 prop = "semtech,ph01-proxraw-strength";
1017 else
1018 prop = "semtech,ph23-proxraw-strength";
1019 ret = device_property_read_u32(dev, prop, &raw);
1020 if (ret)
1021 break;
1022
1023 reg_def->def &= ~SX9324_REG_PROX_CTRL0_RAWFILT_MASK;
1024 reg_def->def |= FIELD_PREP(SX9324_REG_PROX_CTRL0_RAWFILT_MASK,
1025 raw);
1026 break;
1027 }
1028 return reg_def;
1029 }
1030
sx9324_check_whoami(struct device * dev,struct iio_dev * indio_dev)1031 static int sx9324_check_whoami(struct device *dev,
1032 struct iio_dev *indio_dev)
1033 {
1034 /*
1035 * Only one sensor for this driver. Assuming the device tree
1036 * is correct, just set the sensor name.
1037 */
1038 indio_dev->name = "sx9324";
1039 return 0;
1040 }
1041
1042 static const struct sx_common_chip_info sx9324_chip_info = {
1043 .reg_stat = SX9324_REG_STAT0,
1044 .reg_irq_msk = SX9324_REG_IRQ_MSK,
1045 .reg_enable_chan = SX9324_REG_GNRL_CTRL1,
1046 .reg_reset = SX9324_REG_RESET,
1047
1048 .mask_enable_chan = SX9324_REG_GNRL_CTRL1_PHEN_MASK,
1049 .irq_msk_offset = 3,
1050 .num_channels = SX9324_NUM_CHANNELS,
1051 .num_default_regs = ARRAY_SIZE(sx9324_default_regs),
1052
1053 .ops = {
1054 .read_prox_data = sx9324_read_prox_data,
1055 .check_whoami = sx9324_check_whoami,
1056 .init_compensation = sx9324_init_compensation,
1057 .wait_for_sample = sx9324_wait_for_sample,
1058 .get_default_reg = sx9324_get_default_reg,
1059 },
1060
1061 .iio_channels = sx9324_channels,
1062 .num_iio_channels = ARRAY_SIZE(sx9324_channels),
1063 .iio_info = {
1064 .read_raw = sx9324_read_raw,
1065 .read_avail = sx9324_read_avail,
1066 .read_event_value = sx9324_read_event_val,
1067 .write_event_value = sx9324_write_event_val,
1068 .write_raw = sx9324_write_raw,
1069 .read_event_config = sx_common_read_event_config,
1070 .write_event_config = sx_common_write_event_config,
1071 },
1072 };
1073
sx9324_probe(struct i2c_client * client)1074 static int sx9324_probe(struct i2c_client *client)
1075 {
1076 return sx_common_probe(client, &sx9324_chip_info, &sx9324_regmap_config);
1077 }
1078
sx9324_suspend(struct device * dev)1079 static int sx9324_suspend(struct device *dev)
1080 {
1081 struct sx_common_data *data = iio_priv(dev_get_drvdata(dev));
1082 unsigned int regval;
1083 int ret;
1084
1085 disable_irq_nosync(data->client->irq);
1086
1087 guard(mutex)(&data->mutex);
1088 ret = regmap_read(data->regmap, SX9324_REG_GNRL_CTRL1, ®val);
1089 if (ret < 0)
1090 return ret;
1091
1092 data->suspend_ctrl =
1093 FIELD_GET(SX9324_REG_GNRL_CTRL1_PHEN_MASK, regval);
1094
1095
1096 /* Disable all phases, send the device to sleep. */
1097 return regmap_write(data->regmap, SX9324_REG_GNRL_CTRL1, 0);
1098 }
1099
sx9324_resume(struct device * dev)1100 static int sx9324_resume(struct device *dev)
1101 {
1102 struct sx_common_data *data = iio_priv(dev_get_drvdata(dev));
1103
1104 scoped_guard(mutex, &data->mutex) {
1105 int ret = regmap_write(data->regmap, SX9324_REG_GNRL_CTRL1,
1106 data->suspend_ctrl |
1107 SX9324_REG_GNRL_CTRL1_PAUSECTRL);
1108 if (ret)
1109 return ret;
1110 }
1111
1112 enable_irq(data->client->irq);
1113 return 0;
1114 }
1115
1116 static DEFINE_SIMPLE_DEV_PM_OPS(sx9324_pm_ops, sx9324_suspend, sx9324_resume);
1117
1118 static const struct acpi_device_id sx9324_acpi_match[] = {
1119 { "STH9324", SX9324_WHOAMI_VALUE },
1120 { }
1121 };
1122 MODULE_DEVICE_TABLE(acpi, sx9324_acpi_match);
1123
1124 static const struct of_device_id sx9324_of_match[] = {
1125 { .compatible = "semtech,sx9324", (void *)SX9324_WHOAMI_VALUE },
1126 { }
1127 };
1128 MODULE_DEVICE_TABLE(of, sx9324_of_match);
1129
1130 static const struct i2c_device_id sx9324_id[] = {
1131 { "sx9324", SX9324_WHOAMI_VALUE },
1132 { }
1133 };
1134 MODULE_DEVICE_TABLE(i2c, sx9324_id);
1135
1136 static struct i2c_driver sx9324_driver = {
1137 .driver = {
1138 .name = "sx9324",
1139 .acpi_match_table = sx9324_acpi_match,
1140 .of_match_table = sx9324_of_match,
1141 .pm = pm_sleep_ptr(&sx9324_pm_ops),
1142
1143 /*
1144 * Lots of i2c transfers in probe + over 200 ms waiting in
1145 * sx9324_init_compensation() mean a slow probe; prefer async
1146 * so we don't delay boot if we're builtin to the kernel.
1147 */
1148 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1149 },
1150 .probe = sx9324_probe,
1151 .id_table = sx9324_id,
1152 };
1153 module_i2c_driver(sx9324_driver);
1154
1155 MODULE_AUTHOR("Gwendal Grignou <gwendal@chromium.org>");
1156 MODULE_DESCRIPTION("Driver for Semtech SX9324 proximity sensor");
1157 MODULE_LICENSE("GPL v2");
1158 MODULE_IMPORT_NS("SEMTECH_PROX");
1159