1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2015 Intel Corporation
4 *
5 * Driver for TXC PA12203001 Proximity and Ambient Light Sensor.
6 *
7 * To do: Interrupt support.
8 */
9
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/acpi.h>
13 #include <linux/delay.h>
14 #include <linux/i2c.h>
15 #include <linux/iio/iio.h>
16 #include <linux/iio/sysfs.h>
17 #include <linux/mutex.h>
18 #include <linux/pm.h>
19 #include <linux/pm_runtime.h>
20 #include <linux/regmap.h>
21
22 #define PA12203001_DRIVER_NAME "pa12203001"
23
24 #define PA12203001_REG_CFG0 0x00
25 #define PA12203001_REG_CFG1 0x01
26 #define PA12203001_REG_CFG2 0x02
27 #define PA12203001_REG_CFG3 0x03
28
29 #define PA12203001_REG_ADL 0x0b
30 #define PA12203001_REG_PDH 0x0e
31
32 #define PA12203001_REG_POFS 0x10
33 #define PA12203001_REG_PSET 0x11
34
35 #define PA12203001_ALS_EN_MASK BIT(0)
36 #define PA12203001_PX_EN_MASK BIT(1)
37 #define PA12203001_PX_NORMAL_MODE_MASK GENMASK(7, 6)
38 #define PA12203001_AFSR_MASK GENMASK(5, 4)
39 #define PA12203001_AFSR_SHIFT 4
40
41 #define PA12203001_PSCAN 0x03
42
43 /* als range 31000, ps, als disabled */
44 #define PA12203001_REG_CFG0_DEFAULT 0x30
45
46 /* led current: 100 mA */
47 #define PA12203001_REG_CFG1_DEFAULT 0x20
48
49 /* ps mode: normal, interrupts not active */
50 #define PA12203001_REG_CFG2_DEFAULT 0xcc
51
52 #define PA12203001_REG_CFG3_DEFAULT 0x00
53
54 #define PA12203001_SLEEP_DELAY_MS 3000
55
56 #define PA12203001_CHIP_ENABLE 0xff
57 #define PA12203001_CHIP_DISABLE 0x00
58
59 /* available scales: corresponding to [500, 4000, 7000, 31000] lux */
60 static const int pa12203001_scales[] = { 7629, 61036, 106813, 473029};
61
62 struct pa12203001_data {
63 struct i2c_client *client;
64
65 /* protect device states */
66 struct mutex lock;
67
68 bool als_enabled;
69 bool px_enabled;
70 bool als_needs_enable;
71 bool px_needs_enable;
72
73 struct regmap *map;
74 };
75
76 static const struct {
77 u8 reg;
78 u8 val;
79 } regvals[] = {
80 {PA12203001_REG_CFG0, PA12203001_REG_CFG0_DEFAULT},
81 {PA12203001_REG_CFG1, PA12203001_REG_CFG1_DEFAULT},
82 {PA12203001_REG_CFG2, PA12203001_REG_CFG2_DEFAULT},
83 {PA12203001_REG_CFG3, PA12203001_REG_CFG3_DEFAULT},
84 {PA12203001_REG_PSET, PA12203001_PSCAN},
85 };
86
87 static IIO_CONST_ATTR(in_illuminance_scale_available,
88 "0.007629 0.061036 0.106813 0.473029");
89
90 static struct attribute *pa12203001_attrs[] = {
91 &iio_const_attr_in_illuminance_scale_available.dev_attr.attr,
92 NULL
93 };
94
95 static const struct attribute_group pa12203001_attr_group = {
96 .attrs = pa12203001_attrs,
97 };
98
99 static const struct iio_chan_spec pa12203001_channels[] = {
100 {
101 .type = IIO_LIGHT,
102 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
103 BIT(IIO_CHAN_INFO_SCALE),
104 },
105 {
106 .type = IIO_PROXIMITY,
107 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
108 }
109 };
110
111 static const struct regmap_range pa12203001_volatile_regs_ranges[] = {
112 regmap_reg_range(PA12203001_REG_ADL, PA12203001_REG_ADL + 1),
113 regmap_reg_range(PA12203001_REG_PDH, PA12203001_REG_PDH),
114 };
115
116 static const struct regmap_access_table pa12203001_volatile_regs = {
117 .yes_ranges = pa12203001_volatile_regs_ranges,
118 .n_yes_ranges = ARRAY_SIZE(pa12203001_volatile_regs_ranges),
119 };
120
121 static const struct regmap_config pa12203001_regmap_config = {
122 .reg_bits = 8,
123 .val_bits = 8,
124 .max_register = PA12203001_REG_PSET,
125 .cache_type = REGCACHE_RBTREE,
126 .volatile_table = &pa12203001_volatile_regs,
127 };
128
pa12203001_als_enable(struct pa12203001_data * data,u8 enable)129 static inline int pa12203001_als_enable(struct pa12203001_data *data, u8 enable)
130 {
131 int ret;
132
133 ret = regmap_update_bits(data->map, PA12203001_REG_CFG0,
134 PA12203001_ALS_EN_MASK, enable);
135 if (ret < 0)
136 return ret;
137
138 data->als_enabled = !!enable;
139
140 return 0;
141 }
142
pa12203001_px_enable(struct pa12203001_data * data,u8 enable)143 static inline int pa12203001_px_enable(struct pa12203001_data *data, u8 enable)
144 {
145 int ret;
146
147 ret = regmap_update_bits(data->map, PA12203001_REG_CFG0,
148 PA12203001_PX_EN_MASK, enable);
149 if (ret < 0)
150 return ret;
151
152 data->px_enabled = !!enable;
153
154 return 0;
155 }
156
pa12203001_set_power_state(struct pa12203001_data * data,bool on,u8 mask)157 static int pa12203001_set_power_state(struct pa12203001_data *data, bool on,
158 u8 mask)
159 {
160 #ifdef CONFIG_PM
161 int ret;
162
163 if (on && (mask & PA12203001_ALS_EN_MASK)) {
164 mutex_lock(&data->lock);
165 if (data->px_enabled) {
166 ret = pa12203001_als_enable(data,
167 PA12203001_ALS_EN_MASK);
168 if (ret < 0)
169 goto err;
170 } else {
171 data->als_needs_enable = true;
172 }
173 mutex_unlock(&data->lock);
174 }
175
176 if (on && (mask & PA12203001_PX_EN_MASK)) {
177 mutex_lock(&data->lock);
178 if (data->als_enabled) {
179 ret = pa12203001_px_enable(data, PA12203001_PX_EN_MASK);
180 if (ret < 0)
181 goto err;
182 } else {
183 data->px_needs_enable = true;
184 }
185 mutex_unlock(&data->lock);
186 }
187
188 if (on) {
189 ret = pm_runtime_resume_and_get(&data->client->dev);
190
191 } else {
192 pm_runtime_mark_last_busy(&data->client->dev);
193 ret = pm_runtime_put_autosuspend(&data->client->dev);
194 }
195
196 return ret;
197
198 err:
199 mutex_unlock(&data->lock);
200 return ret;
201
202 #endif
203 return 0;
204 }
205
pa12203001_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)206 static int pa12203001_read_raw(struct iio_dev *indio_dev,
207 struct iio_chan_spec const *chan, int *val,
208 int *val2, long mask)
209 {
210 struct pa12203001_data *data = iio_priv(indio_dev);
211 int ret;
212 u8 dev_mask;
213 unsigned int reg_byte;
214 __le16 reg_word;
215
216 switch (mask) {
217 case IIO_CHAN_INFO_RAW:
218 switch (chan->type) {
219 case IIO_LIGHT:
220 dev_mask = PA12203001_ALS_EN_MASK;
221 ret = pa12203001_set_power_state(data, true, dev_mask);
222 if (ret < 0)
223 return ret;
224 /*
225 * ALS ADC value is stored in registers
226 * PA12203001_REG_ADL and in PA12203001_REG_ADL + 1.
227 */
228 ret = regmap_bulk_read(data->map, PA12203001_REG_ADL,
229 ®_word, 2);
230 if (ret < 0)
231 goto reg_err;
232
233 *val = le16_to_cpu(reg_word);
234 ret = pa12203001_set_power_state(data, false, dev_mask);
235 if (ret < 0)
236 return ret;
237 break;
238 case IIO_PROXIMITY:
239 dev_mask = PA12203001_PX_EN_MASK;
240 ret = pa12203001_set_power_state(data, true, dev_mask);
241 if (ret < 0)
242 return ret;
243 ret = regmap_read(data->map, PA12203001_REG_PDH,
244 ®_byte);
245 if (ret < 0)
246 goto reg_err;
247
248 *val = reg_byte;
249 ret = pa12203001_set_power_state(data, false, dev_mask);
250 if (ret < 0)
251 return ret;
252 break;
253 default:
254 return -EINVAL;
255 }
256 return IIO_VAL_INT;
257 case IIO_CHAN_INFO_SCALE:
258 ret = regmap_read(data->map, PA12203001_REG_CFG0, ®_byte);
259 if (ret < 0)
260 return ret;
261 *val = 0;
262 reg_byte = (reg_byte & PA12203001_AFSR_MASK);
263 *val2 = pa12203001_scales[reg_byte >> 4];
264 return IIO_VAL_INT_PLUS_MICRO;
265 default:
266 return -EINVAL;
267 }
268
269 reg_err:
270 pa12203001_set_power_state(data, false, dev_mask);
271 return ret;
272 }
273
pa12203001_write_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int val,int val2,long mask)274 static int pa12203001_write_raw(struct iio_dev *indio_dev,
275 struct iio_chan_spec const *chan, int val,
276 int val2, long mask)
277 {
278 struct pa12203001_data *data = iio_priv(indio_dev);
279 int i, ret, new_val;
280 unsigned int reg_byte;
281
282 switch (mask) {
283 case IIO_CHAN_INFO_SCALE:
284 ret = regmap_read(data->map, PA12203001_REG_CFG0, ®_byte);
285 if (val != 0 || ret < 0)
286 return -EINVAL;
287 for (i = 0; i < ARRAY_SIZE(pa12203001_scales); i++) {
288 if (val2 == pa12203001_scales[i]) {
289 new_val = i << PA12203001_AFSR_SHIFT;
290 return regmap_update_bits(data->map,
291 PA12203001_REG_CFG0,
292 PA12203001_AFSR_MASK,
293 new_val);
294 }
295 }
296 break;
297 default:
298 break;
299 }
300
301 return -EINVAL;
302 }
303
304 static const struct iio_info pa12203001_info = {
305 .read_raw = pa12203001_read_raw,
306 .write_raw = pa12203001_write_raw,
307 .attrs = &pa12203001_attr_group,
308 };
309
pa12203001_init(struct iio_dev * indio_dev)310 static int pa12203001_init(struct iio_dev *indio_dev)
311 {
312 struct pa12203001_data *data = iio_priv(indio_dev);
313 int i, ret;
314
315 for (i = 0; i < ARRAY_SIZE(regvals); i++) {
316 ret = regmap_write(data->map, regvals[i].reg, regvals[i].val);
317 if (ret < 0)
318 return ret;
319 }
320
321 return 0;
322 }
323
pa12203001_power_chip(struct iio_dev * indio_dev,u8 state)324 static int pa12203001_power_chip(struct iio_dev *indio_dev, u8 state)
325 {
326 struct pa12203001_data *data = iio_priv(indio_dev);
327 int ret;
328
329 mutex_lock(&data->lock);
330 ret = pa12203001_als_enable(data, state);
331 if (ret < 0)
332 goto out;
333
334 ret = pa12203001_px_enable(data, state);
335
336 out:
337 mutex_unlock(&data->lock);
338 return ret;
339 }
340
pa12203001_probe(struct i2c_client * client)341 static int pa12203001_probe(struct i2c_client *client)
342 {
343 struct pa12203001_data *data;
344 struct iio_dev *indio_dev;
345 int ret;
346
347 indio_dev = devm_iio_device_alloc(&client->dev,
348 sizeof(struct pa12203001_data));
349 if (!indio_dev)
350 return -ENOMEM;
351
352 data = iio_priv(indio_dev);
353 i2c_set_clientdata(client, indio_dev);
354 data->client = client;
355
356 data->map = devm_regmap_init_i2c(client, &pa12203001_regmap_config);
357 if (IS_ERR(data->map))
358 return PTR_ERR(data->map);
359
360 mutex_init(&data->lock);
361
362 indio_dev->info = &pa12203001_info;
363 indio_dev->name = PA12203001_DRIVER_NAME;
364 indio_dev->channels = pa12203001_channels;
365 indio_dev->num_channels = ARRAY_SIZE(pa12203001_channels);
366 indio_dev->modes = INDIO_DIRECT_MODE;
367
368 ret = pa12203001_init(indio_dev);
369 if (ret < 0)
370 return ret;
371
372 ret = pa12203001_power_chip(indio_dev, PA12203001_CHIP_ENABLE);
373 if (ret < 0)
374 return ret;
375
376 ret = pm_runtime_set_active(&client->dev);
377 if (ret < 0)
378 goto out_err;
379
380 pm_runtime_enable(&client->dev);
381 pm_runtime_set_autosuspend_delay(&client->dev,
382 PA12203001_SLEEP_DELAY_MS);
383 pm_runtime_use_autosuspend(&client->dev);
384
385 ret = iio_device_register(indio_dev);
386 if (ret < 0)
387 goto out_err;
388
389 return 0;
390
391 out_err:
392 pa12203001_power_chip(indio_dev, PA12203001_CHIP_DISABLE);
393 return ret;
394 }
395
pa12203001_remove(struct i2c_client * client)396 static void pa12203001_remove(struct i2c_client *client)
397 {
398 struct iio_dev *indio_dev = i2c_get_clientdata(client);
399 int ret;
400
401 iio_device_unregister(indio_dev);
402
403 pm_runtime_disable(&client->dev);
404 pm_runtime_set_suspended(&client->dev);
405
406 ret = pa12203001_power_chip(indio_dev, PA12203001_CHIP_DISABLE);
407 if (ret)
408 dev_warn(&client->dev, "Failed to power down (%pe)\n",
409 ERR_PTR(ret));
410 }
411
412 #if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM)
pa12203001_suspend(struct device * dev)413 static int pa12203001_suspend(struct device *dev)
414 {
415 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
416
417 return pa12203001_power_chip(indio_dev, PA12203001_CHIP_DISABLE);
418 }
419 #endif
420
421 #ifdef CONFIG_PM_SLEEP
pa12203001_resume(struct device * dev)422 static int pa12203001_resume(struct device *dev)
423 {
424 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
425
426 return pa12203001_power_chip(indio_dev, PA12203001_CHIP_ENABLE);
427 }
428 #endif
429
430 #ifdef CONFIG_PM
pa12203001_runtime_resume(struct device * dev)431 static int pa12203001_runtime_resume(struct device *dev)
432 {
433 struct pa12203001_data *data;
434
435 data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
436
437 mutex_lock(&data->lock);
438 if (data->als_needs_enable) {
439 pa12203001_als_enable(data, PA12203001_ALS_EN_MASK);
440 data->als_needs_enable = false;
441 }
442 if (data->px_needs_enable) {
443 pa12203001_px_enable(data, PA12203001_PX_EN_MASK);
444 data->px_needs_enable = false;
445 }
446 mutex_unlock(&data->lock);
447
448 return 0;
449 }
450 #endif
451
452 static const struct dev_pm_ops pa12203001_pm_ops = {
453 SET_SYSTEM_SLEEP_PM_OPS(pa12203001_suspend, pa12203001_resume)
454 SET_RUNTIME_PM_OPS(pa12203001_suspend, pa12203001_runtime_resume, NULL)
455 };
456
457 static const struct acpi_device_id pa12203001_acpi_match[] = {
458 { "TXCPA122", 0 },
459 {}
460 };
461
462 MODULE_DEVICE_TABLE(acpi, pa12203001_acpi_match);
463
464 static const struct i2c_device_id pa12203001_id[] = {
465 { "txcpa122", 0 },
466 {}
467 };
468
469 MODULE_DEVICE_TABLE(i2c, pa12203001_id);
470
471 static struct i2c_driver pa12203001_driver = {
472 .driver = {
473 .name = PA12203001_DRIVER_NAME,
474 .pm = &pa12203001_pm_ops,
475 .acpi_match_table = ACPI_PTR(pa12203001_acpi_match),
476 },
477 .probe_new = pa12203001_probe,
478 .remove = pa12203001_remove,
479 .id_table = pa12203001_id,
480
481 };
482 module_i2c_driver(pa12203001_driver);
483
484 MODULE_AUTHOR("Adriana Reus <adriana.reus@intel.com>");
485 MODULE_DESCRIPTION("Driver for TXC PA12203001 Proximity and Light Sensor");
486 MODULE_LICENSE("GPL v2");
487