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15#include <linux/init.h>
16#include <linux/module.h>
17#include <linux/slab.h>
18#include <linux/platform_device.h>
19#include <linux/interrupt.h>
20#include <linux/i2c/twl.h>
21#include <linux/power_supply.h>
22#include <linux/notifier.h>
23#include <linux/usb/otg.h>
24
25#define TWL4030_BCIMSTATEC 0x02
26#define TWL4030_BCIICHG 0x08
27#define TWL4030_BCIVAC 0x0a
28#define TWL4030_BCIVBUS 0x0c
29#define TWL4030_BCIMFSTS4 0x10
30#define TWL4030_BCICTL1 0x23
31
32#define TWL4030_BCIAUTOWEN BIT(5)
33#define TWL4030_CONFIG_DONE BIT(4)
34#define TWL4030_BCIAUTOUSB BIT(1)
35#define TWL4030_BCIAUTOAC BIT(0)
36#define TWL4030_CGAIN BIT(5)
37#define TWL4030_USBFASTMCHG BIT(2)
38#define TWL4030_STS_VBUS BIT(7)
39#define TWL4030_STS_USB_ID BIT(2)
40
41
42#define TWL4030_WOVF BIT(0)
43#define TWL4030_TMOVF BIT(1)
44#define TWL4030_ICHGHIGH BIT(2)
45#define TWL4030_ICHGLOW BIT(3)
46#define TWL4030_ICHGEOC BIT(4)
47#define TWL4030_TBATOR2 BIT(5)
48#define TWL4030_TBATOR1 BIT(6)
49#define TWL4030_BATSTS BIT(7)
50
51#define TWL4030_VBATLVL BIT(0)
52#define TWL4030_VBATOV BIT(1)
53#define TWL4030_VBUSOV BIT(2)
54#define TWL4030_ACCHGOV BIT(3)
55
56#define TWL4030_MSTATEC_USB BIT(4)
57#define TWL4030_MSTATEC_AC BIT(5)
58#define TWL4030_MSTATEC_MASK 0x0f
59#define TWL4030_MSTATEC_QUICK1 0x02
60#define TWL4030_MSTATEC_QUICK7 0x07
61#define TWL4030_MSTATEC_COMPLETE1 0x0b
62#define TWL4030_MSTATEC_COMPLETE4 0x0e
63
64static bool allow_usb;
65module_param(allow_usb, bool, 1);
66MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");
67
68struct twl4030_bci {
69 struct device *dev;
70 struct power_supply ac;
71 struct power_supply usb;
72 struct otg_transceiver *transceiver;
73 struct notifier_block otg_nb;
74 struct work_struct work;
75 int irq_chg;
76 int irq_bci;
77
78 unsigned long event;
79};
80
81
82
83
84static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg)
85{
86 u8 val = 0;
87 int ret;
88
89 ret = twl_i2c_read_u8(mod_no, &val, reg);
90 if (ret)
91 return ret;
92
93 val &= ~clear;
94 val |= set;
95
96 return twl_i2c_write_u8(mod_no, val, reg);
97}
98
99static int twl4030_bci_read(u8 reg, u8 *val)
100{
101 return twl_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE, val, reg);
102}
103
104static int twl4030_clear_set_boot_bci(u8 clear, u8 set)
105{
106 return twl4030_clear_set(TWL4030_MODULE_PM_MASTER, 0,
107 TWL4030_CONFIG_DONE | TWL4030_BCIAUTOWEN | set,
108 TWL4030_PM_MASTER_BOOT_BCI);
109}
110
111static int twl4030bci_read_adc_val(u8 reg)
112{
113 int ret, temp;
114 u8 val;
115
116
117 ret = twl4030_bci_read(reg + 1, &val);
118 if (ret)
119 return ret;
120
121 temp = (int)(val & 0x03) << 8;
122
123
124 ret = twl4030_bci_read(reg, &val);
125 if (ret)
126 return ret;
127
128 return temp | val;
129}
130
131
132
133
134static int twl4030_bci_have_vbus(struct twl4030_bci *bci)
135{
136 int ret;
137 u8 hwsts;
138
139 ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &hwsts,
140 TWL4030_PM_MASTER_STS_HW_CONDITIONS);
141 if (ret < 0)
142 return 0;
143
144 dev_dbg(bci->dev, "check_vbus: HW_CONDITIONS %02x\n", hwsts);
145
146
147 if ((hwsts & TWL4030_STS_VBUS) && !(hwsts & TWL4030_STS_USB_ID))
148 return 1;
149
150 return 0;
151}
152
153
154
155
156static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
157{
158 int ret;
159
160 if (enable) {
161
162 if (!twl4030_bci_have_vbus(bci))
163 return -ENODEV;
164
165
166
167
168
169 if (!allow_usb) {
170 dev_warn(bci->dev, "USB charging is disabled.\n");
171 return -EACCES;
172 }
173
174
175 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
176 if (ret < 0)
177 return ret;
178
179
180 ret = twl4030_clear_set(TWL4030_MODULE_MAIN_CHARGE, 0,
181 TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
182 } else {
183 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
184 }
185
186 return ret;
187}
188
189
190
191
192static int twl4030_charger_enable_ac(bool enable)
193{
194 int ret;
195
196 if (enable)
197 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
198 else
199 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
200
201 return ret;
202}
203
204
205
206
207static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
208{
209 struct twl4030_bci *bci = arg;
210
211 dev_dbg(bci->dev, "CHG_PRES irq\n");
212 power_supply_changed(&bci->ac);
213 power_supply_changed(&bci->usb);
214
215 return IRQ_HANDLED;
216}
217
218
219
220
221static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
222{
223 struct twl4030_bci *bci = arg;
224 u8 irqs1, irqs2;
225 int ret;
226
227 ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
228 TWL4030_INTERRUPTS_BCIISR1A);
229 if (ret < 0)
230 return IRQ_HANDLED;
231
232 ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
233 TWL4030_INTERRUPTS_BCIISR2A);
234 if (ret < 0)
235 return IRQ_HANDLED;
236
237 dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);
238
239 if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) {
240
241 power_supply_changed(&bci->ac);
242 power_supply_changed(&bci->usb);
243 }
244
245
246 if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1))
247 dev_warn(bci->dev, "battery temperature out of range\n");
248
249 if (irqs1 & TWL4030_BATSTS)
250 dev_crit(bci->dev, "battery disconnected\n");
251
252 if (irqs2 & TWL4030_VBATOV)
253 dev_crit(bci->dev, "VBAT overvoltage\n");
254
255 if (irqs2 & TWL4030_VBUSOV)
256 dev_crit(bci->dev, "VBUS overvoltage\n");
257
258 if (irqs2 & TWL4030_ACCHGOV)
259 dev_crit(bci->dev, "Ac charger overvoltage\n");
260
261 return IRQ_HANDLED;
262}
263
264static void twl4030_bci_usb_work(struct work_struct *data)
265{
266 struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
267
268 switch (bci->event) {
269 case USB_EVENT_VBUS:
270 case USB_EVENT_CHARGER:
271 twl4030_charger_enable_usb(bci, true);
272 break;
273 case USB_EVENT_NONE:
274 twl4030_charger_enable_usb(bci, false);
275 break;
276 }
277}
278
279static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
280 void *priv)
281{
282 struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, otg_nb);
283
284 dev_dbg(bci->dev, "OTG notify %lu\n", val);
285
286 bci->event = val;
287 schedule_work(&bci->work);
288
289 return NOTIFY_OK;
290}
291
292
293
294
295
296
297
298
299
300static int twl4030_charger_get_current(void)
301{
302 int curr;
303 int ret;
304 u8 bcictl1;
305
306 curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
307 if (curr < 0)
308 return curr;
309
310 ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
311 if (ret)
312 return ret;
313
314 ret = (curr * 16618 - 850 * 10000) / 10;
315 if (bcictl1 & TWL4030_CGAIN)
316 ret *= 2;
317
318 return ret;
319}
320
321
322
323
324
325static int twl4030bci_state(struct twl4030_bci *bci)
326{
327 int ret;
328 u8 state;
329
330 ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
331 if (ret) {
332 pr_err("twl4030_bci: error reading BCIMSTATEC\n");
333 return ret;
334 }
335
336 dev_dbg(bci->dev, "state: %02x\n", state);
337
338 return state;
339}
340
341static int twl4030_bci_state_to_status(int state)
342{
343 state &= TWL4030_MSTATEC_MASK;
344 if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
345 return POWER_SUPPLY_STATUS_CHARGING;
346 else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
347 state <= TWL4030_MSTATEC_COMPLETE4)
348 return POWER_SUPPLY_STATUS_FULL;
349 else
350 return POWER_SUPPLY_STATUS_NOT_CHARGING;
351}
352
353static int twl4030_bci_get_property(struct power_supply *psy,
354 enum power_supply_property psp,
355 union power_supply_propval *val)
356{
357 struct twl4030_bci *bci = dev_get_drvdata(psy->dev->parent);
358 int is_charging;
359 int state;
360 int ret;
361
362 state = twl4030bci_state(bci);
363 if (state < 0)
364 return state;
365
366 if (psy->type == POWER_SUPPLY_TYPE_USB)
367 is_charging = state & TWL4030_MSTATEC_USB;
368 else
369 is_charging = state & TWL4030_MSTATEC_AC;
370
371 switch (psp) {
372 case POWER_SUPPLY_PROP_STATUS:
373 if (is_charging)
374 val->intval = twl4030_bci_state_to_status(state);
375 else
376 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
377 break;
378 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
379
380 if (!is_charging)
381 return -ENODATA;
382 if (psy->type == POWER_SUPPLY_TYPE_USB) {
383 ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
384 if (ret < 0)
385 return ret;
386
387 val->intval = ret * 6843;
388 } else {
389 ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
390 if (ret < 0)
391 return ret;
392
393 val->intval = ret * 9775;
394 }
395 break;
396 case POWER_SUPPLY_PROP_CURRENT_NOW:
397 if (!is_charging)
398 return -ENODATA;
399
400 ret = twl4030_charger_get_current();
401 if (ret < 0)
402 return ret;
403 val->intval = ret;
404 break;
405 case POWER_SUPPLY_PROP_ONLINE:
406 val->intval = is_charging &&
407 twl4030_bci_state_to_status(state) !=
408 POWER_SUPPLY_STATUS_NOT_CHARGING;
409 break;
410 default:
411 return -EINVAL;
412 }
413
414 return 0;
415}
416
417static enum power_supply_property twl4030_charger_props[] = {
418 POWER_SUPPLY_PROP_STATUS,
419 POWER_SUPPLY_PROP_ONLINE,
420 POWER_SUPPLY_PROP_VOLTAGE_NOW,
421 POWER_SUPPLY_PROP_CURRENT_NOW,
422};
423
424static int __init twl4030_bci_probe(struct platform_device *pdev)
425{
426 struct twl4030_bci *bci;
427 int ret;
428 int reg;
429
430 bci = kzalloc(sizeof(*bci), GFP_KERNEL);
431 if (bci == NULL)
432 return -ENOMEM;
433
434 bci->dev = &pdev->dev;
435 bci->irq_chg = platform_get_irq(pdev, 0);
436 bci->irq_bci = platform_get_irq(pdev, 1);
437
438 platform_set_drvdata(pdev, bci);
439
440 bci->ac.name = "twl4030_ac";
441 bci->ac.type = POWER_SUPPLY_TYPE_MAINS;
442 bci->ac.properties = twl4030_charger_props;
443 bci->ac.num_properties = ARRAY_SIZE(twl4030_charger_props);
444 bci->ac.get_property = twl4030_bci_get_property;
445
446 ret = power_supply_register(&pdev->dev, &bci->ac);
447 if (ret) {
448 dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
449 goto fail_register_ac;
450 }
451
452 bci->usb.name = "twl4030_usb";
453 bci->usb.type = POWER_SUPPLY_TYPE_USB;
454 bci->usb.properties = twl4030_charger_props;
455 bci->usb.num_properties = ARRAY_SIZE(twl4030_charger_props);
456 bci->usb.get_property = twl4030_bci_get_property;
457
458 ret = power_supply_register(&pdev->dev, &bci->usb);
459 if (ret) {
460 dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
461 goto fail_register_usb;
462 }
463
464 ret = request_threaded_irq(bci->irq_chg, NULL,
465 twl4030_charger_interrupt, 0, pdev->name, bci);
466 if (ret < 0) {
467 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
468 bci->irq_chg, ret);
469 goto fail_chg_irq;
470 }
471
472 ret = request_threaded_irq(bci->irq_bci, NULL,
473 twl4030_bci_interrupt, 0, pdev->name, bci);
474 if (ret < 0) {
475 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
476 bci->irq_bci, ret);
477 goto fail_bci_irq;
478 }
479
480 INIT_WORK(&bci->work, twl4030_bci_usb_work);
481
482 bci->transceiver = otg_get_transceiver();
483 if (bci->transceiver != NULL) {
484 bci->otg_nb.notifier_call = twl4030_bci_usb_ncb;
485 otg_register_notifier(bci->transceiver, &bci->otg_nb);
486 }
487
488
489 reg = ~(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 |
490 TWL4030_TBATOR1 | TWL4030_BATSTS);
491 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
492 TWL4030_INTERRUPTS_BCIIMR1A);
493 if (ret < 0) {
494 dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
495 goto fail_unmask_interrupts;
496 }
497
498 reg = ~(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV);
499 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
500 TWL4030_INTERRUPTS_BCIIMR2A);
501 if (ret < 0)
502 dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
503
504 twl4030_charger_enable_ac(true);
505 twl4030_charger_enable_usb(bci, true);
506
507 return 0;
508
509fail_unmask_interrupts:
510 if (bci->transceiver != NULL) {
511 otg_unregister_notifier(bci->transceiver, &bci->otg_nb);
512 otg_put_transceiver(bci->transceiver);
513 }
514 free_irq(bci->irq_bci, bci);
515fail_bci_irq:
516 free_irq(bci->irq_chg, bci);
517fail_chg_irq:
518 power_supply_unregister(&bci->usb);
519fail_register_usb:
520 power_supply_unregister(&bci->ac);
521fail_register_ac:
522 platform_set_drvdata(pdev, NULL);
523 kfree(bci);
524
525 return ret;
526}
527
528static int __exit twl4030_bci_remove(struct platform_device *pdev)
529{
530 struct twl4030_bci *bci = platform_get_drvdata(pdev);
531
532 twl4030_charger_enable_ac(false);
533 twl4030_charger_enable_usb(bci, false);
534
535
536 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
537 TWL4030_INTERRUPTS_BCIIMR1A);
538 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
539 TWL4030_INTERRUPTS_BCIIMR2A);
540
541 if (bci->transceiver != NULL) {
542 otg_unregister_notifier(bci->transceiver, &bci->otg_nb);
543 otg_put_transceiver(bci->transceiver);
544 }
545 free_irq(bci->irq_bci, bci);
546 free_irq(bci->irq_chg, bci);
547 power_supply_unregister(&bci->usb);
548 power_supply_unregister(&bci->ac);
549 platform_set_drvdata(pdev, NULL);
550 kfree(bci);
551
552 return 0;
553}
554
555static struct platform_driver twl4030_bci_driver = {
556 .driver = {
557 .name = "twl4030_bci",
558 .owner = THIS_MODULE,
559 },
560 .remove = __exit_p(twl4030_bci_remove),
561};
562
563static int __init twl4030_bci_init(void)
564{
565 return platform_driver_probe(&twl4030_bci_driver, twl4030_bci_probe);
566}
567module_init(twl4030_bci_init);
568
569static void __exit twl4030_bci_exit(void)
570{
571 platform_driver_unregister(&twl4030_bci_driver);
572}
573module_exit(twl4030_bci_exit);
574
575MODULE_AUTHOR("Gražydas Ignotas");
576MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
577MODULE_LICENSE("GPL");
578MODULE_ALIAS("platform:twl4030_bci");
579
