1
2
3
4
5
6
7
8
9#include <linux/bitops.h>
10#include <linux/device.h>
11#include <linux/devm-helpers.h>
12#include <linux/init.h>
13#include <linux/interrupt.h>
14#include <linux/kernel.h>
15#include <linux/mfd/axp20x.h>
16#include <linux/module.h>
17#include <linux/of.h>
18#include <linux/of_device.h>
19#include <linux/platform_device.h>
20#include <linux/pm.h>
21#include <linux/power_supply.h>
22#include <linux/regmap.h>
23#include <linux/slab.h>
24#include <linux/iio/consumer.h>
25#include <linux/workqueue.h>
26
27#define DRVNAME "axp20x-usb-power-supply"
28
29#define AXP20X_PWR_STATUS_VBUS_PRESENT BIT(5)
30#define AXP20X_PWR_STATUS_VBUS_USED BIT(4)
31
32#define AXP20X_USB_STATUS_VBUS_VALID BIT(2)
33
34#define AXP20X_VBUS_PATH_SEL BIT(7)
35#define AXP20X_VBUS_PATH_SEL_OFFSET 7
36
37#define AXP20X_VBUS_VHOLD_uV(b) (4000000 + (((b) >> 3) & 7) * 100000)
38#define AXP20X_VBUS_VHOLD_MASK GENMASK(5, 3)
39#define AXP20X_VBUS_VHOLD_OFFSET 3
40#define AXP20X_VBUS_CLIMIT_MASK 3
41#define AXP20X_VBUS_CLIMIT_900mA 0
42#define AXP20X_VBUS_CLIMIT_500mA 1
43#define AXP20X_VBUS_CLIMIT_100mA 2
44#define AXP20X_VBUS_CLIMIT_NONE 3
45
46#define AXP813_VBUS_CLIMIT_900mA 0
47#define AXP813_VBUS_CLIMIT_1500mA 1
48#define AXP813_VBUS_CLIMIT_2000mA 2
49#define AXP813_VBUS_CLIMIT_2500mA 3
50
51#define AXP20X_ADC_EN1_VBUS_CURR BIT(2)
52#define AXP20X_ADC_EN1_VBUS_VOLT BIT(3)
53
54#define AXP20X_VBUS_MON_VBUS_VALID BIT(3)
55
56#define AXP813_BC_EN BIT(0)
57
58
59
60
61
62#define DEBOUNCE_TIME msecs_to_jiffies(50)
63
64struct axp20x_usb_power {
65 struct regmap *regmap;
66 struct power_supply *supply;
67 enum axp20x_variants axp20x_id;
68 struct iio_channel *vbus_v;
69 struct iio_channel *vbus_i;
70 struct delayed_work vbus_detect;
71 unsigned int old_status;
72 unsigned int online;
73 unsigned int num_irqs;
74 unsigned int irqs[];
75};
76
77static bool axp20x_usb_vbus_needs_polling(struct axp20x_usb_power *power)
78{
79
80
81
82
83
84 if (power->axp20x_id >= AXP221_ID && !power->online)
85 return true;
86
87 return false;
88}
89
90static irqreturn_t axp20x_usb_power_irq(int irq, void *devid)
91{
92 struct axp20x_usb_power *power = devid;
93
94 power_supply_changed(power->supply);
95
96 mod_delayed_work(system_power_efficient_wq, &power->vbus_detect, DEBOUNCE_TIME);
97
98 return IRQ_HANDLED;
99}
100
101static void axp20x_usb_power_poll_vbus(struct work_struct *work)
102{
103 struct axp20x_usb_power *power =
104 container_of(work, struct axp20x_usb_power, vbus_detect.work);
105 unsigned int val;
106 int ret;
107
108 ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &val);
109 if (ret)
110 goto out;
111
112 val &= (AXP20X_PWR_STATUS_VBUS_PRESENT | AXP20X_PWR_STATUS_VBUS_USED);
113 if (val != power->old_status)
114 power_supply_changed(power->supply);
115
116 power->old_status = val;
117 power->online = val & AXP20X_PWR_STATUS_VBUS_USED;
118
119out:
120 if (axp20x_usb_vbus_needs_polling(power))
121 mod_delayed_work(system_power_efficient_wq, &power->vbus_detect, DEBOUNCE_TIME);
122}
123
124static int axp20x_get_current_max(struct axp20x_usb_power *power, int *val)
125{
126 unsigned int v;
127 int ret = regmap_read(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, &v);
128
129 if (ret)
130 return ret;
131
132 switch (v & AXP20X_VBUS_CLIMIT_MASK) {
133 case AXP20X_VBUS_CLIMIT_100mA:
134 if (power->axp20x_id == AXP221_ID)
135 *val = -1;
136 else
137 *val = 100000;
138 break;
139 case AXP20X_VBUS_CLIMIT_500mA:
140 *val = 500000;
141 break;
142 case AXP20X_VBUS_CLIMIT_900mA:
143 *val = 900000;
144 break;
145 case AXP20X_VBUS_CLIMIT_NONE:
146 *val = -1;
147 break;
148 }
149
150 return 0;
151}
152
153static int axp813_get_current_max(struct axp20x_usb_power *power, int *val)
154{
155 unsigned int v;
156 int ret = regmap_read(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, &v);
157
158 if (ret)
159 return ret;
160
161 switch (v & AXP20X_VBUS_CLIMIT_MASK) {
162 case AXP813_VBUS_CLIMIT_900mA:
163 *val = 900000;
164 break;
165 case AXP813_VBUS_CLIMIT_1500mA:
166 *val = 1500000;
167 break;
168 case AXP813_VBUS_CLIMIT_2000mA:
169 *val = 2000000;
170 break;
171 case AXP813_VBUS_CLIMIT_2500mA:
172 *val = 2500000;
173 break;
174 }
175 return 0;
176}
177
178static int axp20x_usb_power_get_property(struct power_supply *psy,
179 enum power_supply_property psp, union power_supply_propval *val)
180{
181 struct axp20x_usb_power *power = power_supply_get_drvdata(psy);
182 unsigned int input, v;
183 int ret;
184
185 switch (psp) {
186 case POWER_SUPPLY_PROP_VOLTAGE_MIN:
187 ret = regmap_read(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, &v);
188 if (ret)
189 return ret;
190
191 val->intval = AXP20X_VBUS_VHOLD_uV(v);
192 return 0;
193 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
194 if (IS_ENABLED(CONFIG_AXP20X_ADC)) {
195 ret = iio_read_channel_processed(power->vbus_v,
196 &val->intval);
197 if (ret)
198 return ret;
199
200
201
202
203
204 val->intval *= 1000;
205 return 0;
206 }
207
208 ret = axp20x_read_variable_width(power->regmap,
209 AXP20X_VBUS_V_ADC_H, 12);
210 if (ret < 0)
211 return ret;
212
213 val->intval = ret * 1700;
214 return 0;
215 case POWER_SUPPLY_PROP_CURRENT_MAX:
216 if (power->axp20x_id == AXP813_ID)
217 return axp813_get_current_max(power, &val->intval);
218 return axp20x_get_current_max(power, &val->intval);
219 case POWER_SUPPLY_PROP_CURRENT_NOW:
220 if (IS_ENABLED(CONFIG_AXP20X_ADC)) {
221 ret = iio_read_channel_processed(power->vbus_i,
222 &val->intval);
223 if (ret)
224 return ret;
225
226
227
228
229
230 val->intval *= 1000;
231 return 0;
232 }
233
234 ret = axp20x_read_variable_width(power->regmap,
235 AXP20X_VBUS_I_ADC_H, 12);
236 if (ret < 0)
237 return ret;
238
239 val->intval = ret * 375;
240 return 0;
241 default:
242 break;
243 }
244
245
246 ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &input);
247 if (ret)
248 return ret;
249
250 switch (psp) {
251 case POWER_SUPPLY_PROP_HEALTH:
252 if (!(input & AXP20X_PWR_STATUS_VBUS_PRESENT)) {
253 val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
254 break;
255 }
256
257 val->intval = POWER_SUPPLY_HEALTH_GOOD;
258
259 if (power->axp20x_id == AXP202_ID) {
260 ret = regmap_read(power->regmap,
261 AXP20X_USB_OTG_STATUS, &v);
262 if (ret)
263 return ret;
264
265 if (!(v & AXP20X_USB_STATUS_VBUS_VALID))
266 val->intval =
267 POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
268 }
269 break;
270 case POWER_SUPPLY_PROP_PRESENT:
271 val->intval = !!(input & AXP20X_PWR_STATUS_VBUS_PRESENT);
272 break;
273 case POWER_SUPPLY_PROP_ONLINE:
274 val->intval = !!(input & AXP20X_PWR_STATUS_VBUS_USED);
275 break;
276 default:
277 return -EINVAL;
278 }
279
280 return 0;
281}
282
283static int axp813_usb_power_set_online(struct axp20x_usb_power *power,
284 int intval)
285{
286 int val = !intval << AXP20X_VBUS_PATH_SEL_OFFSET;
287
288 return regmap_update_bits(power->regmap,
289 AXP20X_VBUS_IPSOUT_MGMT,
290 AXP20X_VBUS_PATH_SEL, val);
291}
292
293static int axp20x_usb_power_set_voltage_min(struct axp20x_usb_power *power,
294 int intval)
295{
296 int val;
297
298 switch (intval) {
299 case 4000000:
300 case 4100000:
301 case 4200000:
302 case 4300000:
303 case 4400000:
304 case 4500000:
305 case 4600000:
306 case 4700000:
307 val = (intval - 4000000) / 100000;
308 return regmap_update_bits(power->regmap,
309 AXP20X_VBUS_IPSOUT_MGMT,
310 AXP20X_VBUS_VHOLD_MASK,
311 val << AXP20X_VBUS_VHOLD_OFFSET);
312 default:
313 return -EINVAL;
314 }
315
316 return -EINVAL;
317}
318
319static int axp813_usb_power_set_current_max(struct axp20x_usb_power *power,
320 int intval)
321{
322 int val;
323
324 switch (intval) {
325 case 900000:
326 return regmap_update_bits(power->regmap,
327 AXP20X_VBUS_IPSOUT_MGMT,
328 AXP20X_VBUS_CLIMIT_MASK,
329 AXP813_VBUS_CLIMIT_900mA);
330 case 1500000:
331 case 2000000:
332 case 2500000:
333 val = (intval - 1000000) / 500000;
334 return regmap_update_bits(power->regmap,
335 AXP20X_VBUS_IPSOUT_MGMT,
336 AXP20X_VBUS_CLIMIT_MASK, val);
337 default:
338 return -EINVAL;
339 }
340
341 return -EINVAL;
342}
343
344static int axp20x_usb_power_set_current_max(struct axp20x_usb_power *power,
345 int intval)
346{
347 int val;
348
349 switch (intval) {
350 case 100000:
351 if (power->axp20x_id == AXP221_ID)
352 return -EINVAL;
353 fallthrough;
354 case 500000:
355 case 900000:
356 val = (900000 - intval) / 400000;
357 return regmap_update_bits(power->regmap,
358 AXP20X_VBUS_IPSOUT_MGMT,
359 AXP20X_VBUS_CLIMIT_MASK, val);
360 default:
361 return -EINVAL;
362 }
363
364 return -EINVAL;
365}
366
367static int axp20x_usb_power_set_property(struct power_supply *psy,
368 enum power_supply_property psp,
369 const union power_supply_propval *val)
370{
371 struct axp20x_usb_power *power = power_supply_get_drvdata(psy);
372
373 switch (psp) {
374 case POWER_SUPPLY_PROP_ONLINE:
375 if (power->axp20x_id != AXP813_ID)
376 return -EINVAL;
377 return axp813_usb_power_set_online(power, val->intval);
378
379 case POWER_SUPPLY_PROP_VOLTAGE_MIN:
380 return axp20x_usb_power_set_voltage_min(power, val->intval);
381
382 case POWER_SUPPLY_PROP_CURRENT_MAX:
383 if (power->axp20x_id == AXP813_ID)
384 return axp813_usb_power_set_current_max(power,
385 val->intval);
386 return axp20x_usb_power_set_current_max(power, val->intval);
387
388 default:
389 return -EINVAL;
390 }
391
392 return -EINVAL;
393}
394
395static int axp20x_usb_power_prop_writeable(struct power_supply *psy,
396 enum power_supply_property psp)
397{
398 struct axp20x_usb_power *power = power_supply_get_drvdata(psy);
399
400
401
402
403
404
405
406
407 if (psp == POWER_SUPPLY_PROP_ONLINE)
408 return power->axp20x_id == AXP813_ID;
409
410 return psp == POWER_SUPPLY_PROP_VOLTAGE_MIN ||
411 psp == POWER_SUPPLY_PROP_CURRENT_MAX;
412}
413
414static enum power_supply_property axp20x_usb_power_properties[] = {
415 POWER_SUPPLY_PROP_HEALTH,
416 POWER_SUPPLY_PROP_PRESENT,
417 POWER_SUPPLY_PROP_ONLINE,
418 POWER_SUPPLY_PROP_VOLTAGE_MIN,
419 POWER_SUPPLY_PROP_VOLTAGE_NOW,
420 POWER_SUPPLY_PROP_CURRENT_MAX,
421 POWER_SUPPLY_PROP_CURRENT_NOW,
422};
423
424static enum power_supply_property axp22x_usb_power_properties[] = {
425 POWER_SUPPLY_PROP_HEALTH,
426 POWER_SUPPLY_PROP_PRESENT,
427 POWER_SUPPLY_PROP_ONLINE,
428 POWER_SUPPLY_PROP_VOLTAGE_MIN,
429 POWER_SUPPLY_PROP_CURRENT_MAX,
430};
431
432static const struct power_supply_desc axp20x_usb_power_desc = {
433 .name = "axp20x-usb",
434 .type = POWER_SUPPLY_TYPE_USB,
435 .properties = axp20x_usb_power_properties,
436 .num_properties = ARRAY_SIZE(axp20x_usb_power_properties),
437 .property_is_writeable = axp20x_usb_power_prop_writeable,
438 .get_property = axp20x_usb_power_get_property,
439 .set_property = axp20x_usb_power_set_property,
440};
441
442static const struct power_supply_desc axp22x_usb_power_desc = {
443 .name = "axp20x-usb",
444 .type = POWER_SUPPLY_TYPE_USB,
445 .properties = axp22x_usb_power_properties,
446 .num_properties = ARRAY_SIZE(axp22x_usb_power_properties),
447 .property_is_writeable = axp20x_usb_power_prop_writeable,
448 .get_property = axp20x_usb_power_get_property,
449 .set_property = axp20x_usb_power_set_property,
450};
451
452static const char * const axp20x_irq_names[] = {
453 "VBUS_PLUGIN",
454 "VBUS_REMOVAL",
455 "VBUS_VALID",
456 "VBUS_NOT_VALID",
457};
458
459static const char * const axp22x_irq_names[] = {
460 "VBUS_PLUGIN",
461 "VBUS_REMOVAL",
462};
463
464struct axp_data {
465 const struct power_supply_desc *power_desc;
466 const char * const *irq_names;
467 unsigned int num_irq_names;
468 enum axp20x_variants axp20x_id;
469};
470
471static const struct axp_data axp202_data = {
472 .power_desc = &axp20x_usb_power_desc,
473 .irq_names = axp20x_irq_names,
474 .num_irq_names = ARRAY_SIZE(axp20x_irq_names),
475 .axp20x_id = AXP202_ID,
476};
477
478static const struct axp_data axp221_data = {
479 .power_desc = &axp22x_usb_power_desc,
480 .irq_names = axp22x_irq_names,
481 .num_irq_names = ARRAY_SIZE(axp22x_irq_names),
482 .axp20x_id = AXP221_ID,
483};
484
485static const struct axp_data axp223_data = {
486 .power_desc = &axp22x_usb_power_desc,
487 .irq_names = axp22x_irq_names,
488 .num_irq_names = ARRAY_SIZE(axp22x_irq_names),
489 .axp20x_id = AXP223_ID,
490};
491
492static const struct axp_data axp813_data = {
493 .power_desc = &axp22x_usb_power_desc,
494 .irq_names = axp22x_irq_names,
495 .num_irq_names = ARRAY_SIZE(axp22x_irq_names),
496 .axp20x_id = AXP813_ID,
497};
498
499#ifdef CONFIG_PM_SLEEP
500static int axp20x_usb_power_suspend(struct device *dev)
501{
502 struct axp20x_usb_power *power = dev_get_drvdata(dev);
503 int i = 0;
504
505
506
507
508
509
510
511 if (device_may_wakeup(&power->supply->dev))
512 enable_irq_wake(power->irqs[i++]);
513 while (i < power->num_irqs)
514 disable_irq(power->irqs[i++]);
515
516 return 0;
517}
518
519static int axp20x_usb_power_resume(struct device *dev)
520{
521 struct axp20x_usb_power *power = dev_get_drvdata(dev);
522 int i = 0;
523
524 if (device_may_wakeup(&power->supply->dev))
525 disable_irq_wake(power->irqs[i++]);
526 while (i < power->num_irqs)
527 enable_irq(power->irqs[i++]);
528
529 mod_delayed_work(system_power_efficient_wq, &power->vbus_detect, DEBOUNCE_TIME);
530
531 return 0;
532}
533#endif
534
535static SIMPLE_DEV_PM_OPS(axp20x_usb_power_pm_ops, axp20x_usb_power_suspend,
536 axp20x_usb_power_resume);
537
538static int configure_iio_channels(struct platform_device *pdev,
539 struct axp20x_usb_power *power)
540{
541 power->vbus_v = devm_iio_channel_get(&pdev->dev, "vbus_v");
542 if (IS_ERR(power->vbus_v)) {
543 if (PTR_ERR(power->vbus_v) == -ENODEV)
544 return -EPROBE_DEFER;
545 return PTR_ERR(power->vbus_v);
546 }
547
548 power->vbus_i = devm_iio_channel_get(&pdev->dev, "vbus_i");
549 if (IS_ERR(power->vbus_i)) {
550 if (PTR_ERR(power->vbus_i) == -ENODEV)
551 return -EPROBE_DEFER;
552 return PTR_ERR(power->vbus_i);
553 }
554
555 return 0;
556}
557
558static int configure_adc_registers(struct axp20x_usb_power *power)
559{
560
561 return regmap_update_bits(power->regmap, AXP20X_ADC_EN1,
562 AXP20X_ADC_EN1_VBUS_CURR |
563 AXP20X_ADC_EN1_VBUS_VOLT,
564 AXP20X_ADC_EN1_VBUS_CURR |
565 AXP20X_ADC_EN1_VBUS_VOLT);
566}
567
568static int axp20x_usb_power_probe(struct platform_device *pdev)
569{
570 struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
571 struct power_supply_config psy_cfg = {};
572 struct axp20x_usb_power *power;
573 const struct axp_data *axp_data;
574 int i, irq, ret;
575
576 if (!of_device_is_available(pdev->dev.of_node))
577 return -ENODEV;
578
579 if (!axp20x) {
580 dev_err(&pdev->dev, "Parent drvdata not set\n");
581 return -EINVAL;
582 }
583
584 axp_data = of_device_get_match_data(&pdev->dev);
585
586 power = devm_kzalloc(&pdev->dev,
587 struct_size(power, irqs, axp_data->num_irq_names),
588 GFP_KERNEL);
589 if (!power)
590 return -ENOMEM;
591
592 platform_set_drvdata(pdev, power);
593
594 power->axp20x_id = axp_data->axp20x_id;
595 power->regmap = axp20x->regmap;
596 power->num_irqs = axp_data->num_irq_names;
597
598 ret = devm_delayed_work_autocancel(&pdev->dev, &power->vbus_detect,
599 axp20x_usb_power_poll_vbus);
600 if (ret)
601 return ret;
602
603 if (power->axp20x_id == AXP202_ID) {
604
605 ret = regmap_update_bits(power->regmap, AXP20X_VBUS_MON,
606 AXP20X_VBUS_MON_VBUS_VALID,
607 AXP20X_VBUS_MON_VBUS_VALID);
608 if (ret)
609 return ret;
610
611 if (IS_ENABLED(CONFIG_AXP20X_ADC))
612 ret = configure_iio_channels(pdev, power);
613 else
614 ret = configure_adc_registers(power);
615
616 if (ret)
617 return ret;
618 }
619
620 if (power->axp20x_id == AXP813_ID) {
621
622 ret = regmap_update_bits(axp20x->regmap, AXP288_BC_GLOBAL,
623 AXP813_BC_EN, AXP813_BC_EN);
624 if (ret)
625 return ret;
626 }
627
628 psy_cfg.of_node = pdev->dev.of_node;
629 psy_cfg.drv_data = power;
630
631 power->supply = devm_power_supply_register(&pdev->dev,
632 axp_data->power_desc,
633 &psy_cfg);
634 if (IS_ERR(power->supply))
635 return PTR_ERR(power->supply);
636
637
638 for (i = 0; i < axp_data->num_irq_names; i++) {
639 irq = platform_get_irq_byname(pdev, axp_data->irq_names[i]);
640 if (irq < 0)
641 return irq;
642
643 power->irqs[i] = regmap_irq_get_virq(axp20x->regmap_irqc, irq);
644 ret = devm_request_any_context_irq(&pdev->dev, power->irqs[i],
645 axp20x_usb_power_irq, 0,
646 DRVNAME, power);
647 if (ret < 0) {
648 dev_err(&pdev->dev, "Error requesting %s IRQ: %d\n",
649 axp_data->irq_names[i], ret);
650 return ret;
651 }
652 }
653
654 if (axp20x_usb_vbus_needs_polling(power))
655 queue_delayed_work(system_power_efficient_wq, &power->vbus_detect, 0);
656
657 return 0;
658}
659
660static const struct of_device_id axp20x_usb_power_match[] = {
661 {
662 .compatible = "x-powers,axp202-usb-power-supply",
663 .data = &axp202_data,
664 }, {
665 .compatible = "x-powers,axp221-usb-power-supply",
666 .data = &axp221_data,
667 }, {
668 .compatible = "x-powers,axp223-usb-power-supply",
669 .data = &axp223_data,
670 }, {
671 .compatible = "x-powers,axp813-usb-power-supply",
672 .data = &axp813_data,
673 }, { }
674};
675MODULE_DEVICE_TABLE(of, axp20x_usb_power_match);
676
677static struct platform_driver axp20x_usb_power_driver = {
678 .probe = axp20x_usb_power_probe,
679 .driver = {
680 .name = DRVNAME,
681 .of_match_table = axp20x_usb_power_match,
682 .pm = &axp20x_usb_power_pm_ops,
683 },
684};
685
686module_platform_driver(axp20x_usb_power_driver);
687
688MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
689MODULE_DESCRIPTION("AXP20x PMIC USB power supply status driver");
690MODULE_LICENSE("GPL");
691
