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1/*
2 * TWL4030/TPS65950 BCI (Battery Charger Interface) driver
3 *
4 * Copyright (C) 2010 Gražvydas Ignotas <notasas@gmail.com>
5 *
6 * based on twl4030_bci_battery.c by TI
7 * Copyright (C) 2008 Texas Instruments, Inc.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 */
14
15#include <linux/init.h>
16#include <linux/module.h>
17#include <linux/slab.h>
18#include <linux/err.h>
19#include <linux/platform_device.h>
20#include <linux/interrupt.h>
21#include <linux/i2c/twl.h>
22#include <linux/power_supply.h>
23#include <linux/notifier.h>
24#include <linux/usb/otg.h>
25#include <linux/regulator/machine.h>
26
27#define TWL4030_BCIMSTATEC 0x02
28#define TWL4030_BCIICHG 0x08
29#define TWL4030_BCIVAC 0x0a
30#define TWL4030_BCIVBUS 0x0c
31#define TWL4030_BCIMFSTS4 0x10
32#define TWL4030_BCICTL1 0x23
33#define TWL4030_BB_CFG 0x12
34
35#define TWL4030_BCIAUTOWEN BIT(5)
36#define TWL4030_CONFIG_DONE BIT(4)
37#define TWL4030_BCIAUTOUSB BIT(1)
38#define TWL4030_BCIAUTOAC BIT(0)
39#define TWL4030_CGAIN BIT(5)
40#define TWL4030_USBFASTMCHG BIT(2)
41#define TWL4030_STS_VBUS BIT(7)
42#define TWL4030_STS_USB_ID BIT(2)
43#define TWL4030_BBCHEN BIT(4)
44#define TWL4030_BBSEL_MASK 0x0c
45#define TWL4030_BBSEL_2V5 0x00
46#define TWL4030_BBSEL_3V0 0x04
47#define TWL4030_BBSEL_3V1 0x08
48#define TWL4030_BBSEL_3V2 0x0c
49#define TWL4030_BBISEL_MASK 0x03
50#define TWL4030_BBISEL_25uA 0x00
51#define TWL4030_BBISEL_150uA 0x01
52#define TWL4030_BBISEL_500uA 0x02
53#define TWL4030_BBISEL_1000uA 0x03
54
55/* BCI interrupts */
56#define TWL4030_WOVF BIT(0) /* Watchdog overflow */
57#define TWL4030_TMOVF BIT(1) /* Timer overflow */
58#define TWL4030_ICHGHIGH BIT(2) /* Battery charge current high */
59#define TWL4030_ICHGLOW BIT(3) /* Battery cc. low / FSM state change */
60#define TWL4030_ICHGEOC BIT(4) /* Battery current end-of-charge */
61#define TWL4030_TBATOR2 BIT(5) /* Battery temperature out of range 2 */
62#define TWL4030_TBATOR1 BIT(6) /* Battery temperature out of range 1 */
63#define TWL4030_BATSTS BIT(7) /* Battery status */
64
65#define TWL4030_VBATLVL BIT(0) /* VBAT level */
66#define TWL4030_VBATOV BIT(1) /* VBAT overvoltage */
67#define TWL4030_VBUSOV BIT(2) /* VBUS overvoltage */
68#define TWL4030_ACCHGOV BIT(3) /* Ac charger overvoltage */
69
70#define TWL4030_MSTATEC_USB BIT(4)
71#define TWL4030_MSTATEC_AC BIT(5)
72#define TWL4030_MSTATEC_MASK 0x0f
73#define TWL4030_MSTATEC_QUICK1 0x02
74#define TWL4030_MSTATEC_QUICK7 0x07
75#define TWL4030_MSTATEC_COMPLETE1 0x0b
76#define TWL4030_MSTATEC_COMPLETE4 0x0e
77
78static bool allow_usb;
79module_param(allow_usb, bool, 0644);
80MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");
81
82struct twl4030_bci {
83 struct device *dev;
84 struct power_supply ac;
85 struct power_supply usb;
86 struct usb_phy *transceiver;
87 struct notifier_block usb_nb;
88 struct work_struct work;
89 int irq_chg;
90 int irq_bci;
91 struct regulator *usb_reg;
92 int usb_enabled;
93
94 unsigned long event;
95};
96
97/*
98 * clear and set bits on an given register on a given module
99 */
100static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg)
101{
102 u8 val = 0;
103 int ret;
104
105 ret = twl_i2c_read_u8(mod_no, &val, reg);
106 if (ret)
107 return ret;
108
109 val &= ~clear;
110 val |= set;
111
112 return twl_i2c_write_u8(mod_no, val, reg);
113}
114
115static int twl4030_bci_read(u8 reg, u8 *val)
116{
117 return twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, val, reg);
118}
119
120static int twl4030_clear_set_boot_bci(u8 clear, u8 set)
121{
122 return twl4030_clear_set(TWL_MODULE_PM_MASTER, clear,
123 TWL4030_CONFIG_DONE | TWL4030_BCIAUTOWEN | set,
124 TWL4030_PM_MASTER_BOOT_BCI);
125}
126
127static int twl4030bci_read_adc_val(u8 reg)
128{
129 int ret, temp;
130 u8 val;
131
132 /* read MSB */
133 ret = twl4030_bci_read(reg + 1, &val);
134 if (ret)
135 return ret;
136
137 temp = (int)(val & 0x03) << 8;
138
139 /* read LSB */
140 ret = twl4030_bci_read(reg, &val);
141 if (ret)
142 return ret;
143
144 return temp | val;
145}
146
147/*
148 * Check if VBUS power is present
149 */
150static int twl4030_bci_have_vbus(struct twl4030_bci *bci)
151{
152 int ret;
153 u8 hwsts;
154
155 ret = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &hwsts,
156 TWL4030_PM_MASTER_STS_HW_CONDITIONS);
157 if (ret < 0)
158 return 0;
159
160 dev_dbg(bci->dev, "check_vbus: HW_CONDITIONS %02x\n", hwsts);
161
162 /* in case we also have STS_USB_ID, VBUS is driven by TWL itself */
163 if ((hwsts & TWL4030_STS_VBUS) && !(hwsts & TWL4030_STS_USB_ID))
164 return 1;
165
166 return 0;
167}
168
169/*
170 * Enable/Disable USB Charge functionality.
171 */
172static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
173{
174 int ret;
175
176 if (enable) {
177 /* Check for USB charger connected */
178 if (!twl4030_bci_have_vbus(bci))
179 return -ENODEV;
180
181 /*
182 * Until we can find out what current the device can provide,
183 * require a module param to enable USB charging.
184 */
185 if (!allow_usb) {
186 dev_warn(bci->dev, "USB charging is disabled.\n");
187 return -EACCES;
188 }
189
190 /* Need to keep regulator on */
191 if (!bci->usb_enabled) {
192 ret = regulator_enable(bci->usb_reg);
193 if (ret) {
194 dev_err(bci->dev,
195 "Failed to enable regulator\n");
196 return ret;
197 }
198 bci->usb_enabled = 1;
199 }
200
201 /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
202 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
203 if (ret < 0)
204 return ret;
205
206 /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
207 ret = twl4030_clear_set(TWL_MODULE_MAIN_CHARGE, 0,
208 TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
209 } else {
210 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
211 if (bci->usb_enabled) {
212 regulator_disable(bci->usb_reg);
213 bci->usb_enabled = 0;
214 }
215 }
216
217 return ret;
218}
219
220/*
221 * Enable/Disable AC Charge funtionality.
222 */
223static int twl4030_charger_enable_ac(bool enable)
224{
225 int ret;
226
227 if (enable)
228 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
229 else
230 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
231
232 return ret;
233}
234
235/*
236 * Enable/Disable charging of Backup Battery.
237 */
238static int twl4030_charger_enable_backup(int uvolt, int uamp)
239{
240 int ret;
241 u8 flags;
242
243 if (uvolt < 2500000 ||
244 uamp < 25) {
245 /* disable charging of backup battery */
246 ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
247 TWL4030_BBCHEN, 0, TWL4030_BB_CFG);
248 return ret;
249 }
250
251 flags = TWL4030_BBCHEN;
252 if (uvolt >= 3200000)
253 flags |= TWL4030_BBSEL_3V2;
254 else if (uvolt >= 3100000)
255 flags |= TWL4030_BBSEL_3V1;
256 else if (uvolt >= 3000000)
257 flags |= TWL4030_BBSEL_3V0;
258 else
259 flags |= TWL4030_BBSEL_2V5;
260
261 if (uamp >= 1000)
262 flags |= TWL4030_BBISEL_1000uA;
263 else if (uamp >= 500)
264 flags |= TWL4030_BBISEL_500uA;
265 else if (uamp >= 150)
266 flags |= TWL4030_BBISEL_150uA;
267 else
268 flags |= TWL4030_BBISEL_25uA;
269
270 ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
271 TWL4030_BBSEL_MASK | TWL4030_BBISEL_MASK,
272 flags,
273 TWL4030_BB_CFG);
274
275 return ret;
276}
277
278/*
279 * TWL4030 CHG_PRES (AC charger presence) events
280 */
281static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
282{
283 struct twl4030_bci *bci = arg;
284
285 dev_dbg(bci->dev, "CHG_PRES irq\n");
286 power_supply_changed(&bci->ac);
287 power_supply_changed(&bci->usb);
288
289 return IRQ_HANDLED;
290}
291
292/*
293 * TWL4030 BCI monitoring events
294 */
295static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
296{
297 struct twl4030_bci *bci = arg;
298 u8 irqs1, irqs2;
299 int ret;
300
301 ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
302 TWL4030_INTERRUPTS_BCIISR1A);
303 if (ret < 0)
304 return IRQ_HANDLED;
305
306 ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
307 TWL4030_INTERRUPTS_BCIISR2A);
308 if (ret < 0)
309 return IRQ_HANDLED;
310
311 dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);
312
313 if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) {
314 /* charger state change, inform the core */
315 power_supply_changed(&bci->ac);
316 power_supply_changed(&bci->usb);
317 }
318
319 /* various monitoring events, for now we just log them here */
320 if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1))
321 dev_warn(bci->dev, "battery temperature out of range\n");
322
323 if (irqs1 & TWL4030_BATSTS)
324 dev_crit(bci->dev, "battery disconnected\n");
325
326 if (irqs2 & TWL4030_VBATOV)
327 dev_crit(bci->dev, "VBAT overvoltage\n");
328
329 if (irqs2 & TWL4030_VBUSOV)
330 dev_crit(bci->dev, "VBUS overvoltage\n");
331
332 if (irqs2 & TWL4030_ACCHGOV)
333 dev_crit(bci->dev, "Ac charger overvoltage\n");
334
335 return IRQ_HANDLED;
336}
337
338static void twl4030_bci_usb_work(struct work_struct *data)
339{
340 struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
341
342 switch (bci->event) {
343 case USB_EVENT_VBUS:
344 case USB_EVENT_CHARGER:
345 twl4030_charger_enable_usb(bci, true);
346 break;
347 case USB_EVENT_NONE:
348 twl4030_charger_enable_usb(bci, false);
349 break;
350 }
351}
352
353static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
354 void *priv)
355{
356 struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb);
357
358 dev_dbg(bci->dev, "OTG notify %lu\n", val);
359
360 bci->event = val;
361 schedule_work(&bci->work);
362
363 return NOTIFY_OK;
364}
365
366/*
367 * TI provided formulas:
368 * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85
369 * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7
370 * Here we use integer approximation of:
371 * CGAIN == 0: val * 1.6618 - 0.85
372 * CGAIN == 1: (val * 1.6618 - 0.85) * 2
373 */
374static int twl4030_charger_get_current(void)
375{
376 int curr;
377 int ret;
378 u8 bcictl1;
379
380 curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
381 if (curr < 0)
382 return curr;
383
384 ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
385 if (ret)
386 return ret;
387
388 ret = (curr * 16618 - 850 * 10000) / 10;
389 if (bcictl1 & TWL4030_CGAIN)
390 ret *= 2;
391
392 return ret;
393}
394
395/*
396 * Returns the main charge FSM state
397 * Or < 0 on failure.
398 */
399static int twl4030bci_state(struct twl4030_bci *bci)
400{
401 int ret;
402 u8 state;
403
404 ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
405 if (ret) {
406 pr_err("twl4030_bci: error reading BCIMSTATEC\n");
407 return ret;
408 }
409
410 dev_dbg(bci->dev, "state: %02x\n", state);
411
412 return state;
413}
414
415static int twl4030_bci_state_to_status(int state)
416{
417 state &= TWL4030_MSTATEC_MASK;
418 if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
419 return POWER_SUPPLY_STATUS_CHARGING;
420 else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
421 state <= TWL4030_MSTATEC_COMPLETE4)
422 return POWER_SUPPLY_STATUS_FULL;
423 else
424 return POWER_SUPPLY_STATUS_NOT_CHARGING;
425}
426
427static int twl4030_bci_get_property(struct power_supply *psy,
428 enum power_supply_property psp,
429 union power_supply_propval *val)
430{
431 struct twl4030_bci *bci = dev_get_drvdata(psy->dev->parent);
432 int is_charging;
433 int state;
434 int ret;
435
436 state = twl4030bci_state(bci);
437 if (state < 0)
438 return state;
439
440 if (psy->type == POWER_SUPPLY_TYPE_USB)
441 is_charging = state & TWL4030_MSTATEC_USB;
442 else
443 is_charging = state & TWL4030_MSTATEC_AC;
444
445 switch (psp) {
446 case POWER_SUPPLY_PROP_STATUS:
447 if (is_charging)
448 val->intval = twl4030_bci_state_to_status(state);
449 else
450 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
451 break;
452 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
453 /* charging must be active for meaningful result */
454 if (!is_charging)
455 return -ENODATA;
456 if (psy->type == POWER_SUPPLY_TYPE_USB) {
457 ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
458 if (ret < 0)
459 return ret;
460 /* BCIVBUS uses ADCIN8, 7/1023 V/step */
461 val->intval = ret * 6843;
462 } else {
463 ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
464 if (ret < 0)
465 return ret;
466 /* BCIVAC uses ADCIN11, 10/1023 V/step */
467 val->intval = ret * 9775;
468 }
469 break;
470 case POWER_SUPPLY_PROP_CURRENT_NOW:
471 if (!is_charging)
472 return -ENODATA;
473 /* current measurement is shared between AC and USB */
474 ret = twl4030_charger_get_current();
475 if (ret < 0)
476 return ret;
477 val->intval = ret;
478 break;
479 case POWER_SUPPLY_PROP_ONLINE:
480 val->intval = is_charging &&
481 twl4030_bci_state_to_status(state) !=
482 POWER_SUPPLY_STATUS_NOT_CHARGING;
483 break;
484 default:
485 return -EINVAL;
486 }
487
488 return 0;
489}
490
491static enum power_supply_property twl4030_charger_props[] = {
492 POWER_SUPPLY_PROP_STATUS,
493 POWER_SUPPLY_PROP_ONLINE,
494 POWER_SUPPLY_PROP_VOLTAGE_NOW,
495 POWER_SUPPLY_PROP_CURRENT_NOW,
496};
497
498#ifdef CONFIG_OF
499static const struct twl4030_bci_platform_data *
500twl4030_bci_parse_dt(struct device *dev)
501{
502 struct device_node *np = dev->of_node;
503 struct twl4030_bci_platform_data *pdata;
504 u32 num;
505
506 if (!np)
507 return NULL;
508 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
509 if (!pdata)
510 return pdata;
511
512 if (of_property_read_u32(np, "ti,bb-uvolt", &num) == 0)
513 pdata->bb_uvolt = num;
514 if (of_property_read_u32(np, "ti,bb-uamp", &num) == 0)
515 pdata->bb_uamp = num;
516 return pdata;
517}
518#else
519static inline const struct twl4030_bci_platform_data *
520twl4030_bci_parse_dt(struct device *dev)
521{
522 return NULL;
523}
524#endif
525
526static int __init twl4030_bci_probe(struct platform_device *pdev)
527{
528 struct twl4030_bci *bci;
529 const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;
530 int ret;
531 u32 reg;
532
533 bci = kzalloc(sizeof(*bci), GFP_KERNEL);
534 if (bci == NULL)
535 return -ENOMEM;
536
537 if (!pdata)
538 pdata = twl4030_bci_parse_dt(&pdev->dev);
539
540 bci->dev = &pdev->dev;
541 bci->irq_chg = platform_get_irq(pdev, 0);
542 bci->irq_bci = platform_get_irq(pdev, 1);
543
544 platform_set_drvdata(pdev, bci);
545
546 bci->ac.name = "twl4030_ac";
547 bci->ac.type = POWER_SUPPLY_TYPE_MAINS;
548 bci->ac.properties = twl4030_charger_props;
549 bci->ac.num_properties = ARRAY_SIZE(twl4030_charger_props);
550 bci->ac.get_property = twl4030_bci_get_property;
551
552 ret = power_supply_register(&pdev->dev, &bci->ac);
553 if (ret) {
554 dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
555 goto fail_register_ac;
556 }
557
558 bci->usb.name = "twl4030_usb";
559 bci->usb.type = POWER_SUPPLY_TYPE_USB;
560 bci->usb.properties = twl4030_charger_props;
561 bci->usb.num_properties = ARRAY_SIZE(twl4030_charger_props);
562 bci->usb.get_property = twl4030_bci_get_property;
563
564 bci->usb_reg = regulator_get(bci->dev, "bci3v1");
565
566 ret = power_supply_register(&pdev->dev, &bci->usb);
567 if (ret) {
568 dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
569 goto fail_register_usb;
570 }
571
572 ret = request_threaded_irq(bci->irq_chg, NULL,
573 twl4030_charger_interrupt, IRQF_ONESHOT, pdev->name,
574 bci);
575 if (ret < 0) {
576 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
577 bci->irq_chg, ret);
578 goto fail_chg_irq;
579 }
580
581 ret = request_threaded_irq(bci->irq_bci, NULL,
582 twl4030_bci_interrupt, IRQF_ONESHOT, pdev->name, bci);
583 if (ret < 0) {
584 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
585 bci->irq_bci, ret);
586 goto fail_bci_irq;
587 }
588
589 INIT_WORK(&bci->work, twl4030_bci_usb_work);
590
591 bci->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
592 if (!IS_ERR_OR_NULL(bci->transceiver)) {
593 bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
594 usb_register_notifier(bci->transceiver, &bci->usb_nb);
595 }
596
597 /* Enable interrupts now. */
598 reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 |
599 TWL4030_TBATOR1 | TWL4030_BATSTS);
600 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
601 TWL4030_INTERRUPTS_BCIIMR1A);
602 if (ret < 0) {
603 dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
604 goto fail_unmask_interrupts;
605 }
606
607 reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV);
608 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
609 TWL4030_INTERRUPTS_BCIIMR2A);
610 if (ret < 0)
611 dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
612
613 twl4030_charger_enable_ac(true);
614 twl4030_charger_enable_usb(bci, true);
615 if (pdata)
616 twl4030_charger_enable_backup(pdata->bb_uvolt,
617 pdata->bb_uamp);
618 else
619 twl4030_charger_enable_backup(0, 0);
620
621 return 0;
622
623fail_unmask_interrupts:
624 if (!IS_ERR_OR_NULL(bci->transceiver)) {
625 usb_unregister_notifier(bci->transceiver, &bci->usb_nb);
626 usb_put_phy(bci->transceiver);
627 }
628 free_irq(bci->irq_bci, bci);
629fail_bci_irq:
630 free_irq(bci->irq_chg, bci);
631fail_chg_irq:
632 power_supply_unregister(&bci->usb);
633fail_register_usb:
634 power_supply_unregister(&bci->ac);
635fail_register_ac:
636 kfree(bci);
637
638 return ret;
639}
640
641static int __exit twl4030_bci_remove(struct platform_device *pdev)
642{
643 struct twl4030_bci *bci = platform_get_drvdata(pdev);
644
645 twl4030_charger_enable_ac(false);
646 twl4030_charger_enable_usb(bci, false);
647 twl4030_charger_enable_backup(0, 0);
648
649 /* mask interrupts */
650 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
651 TWL4030_INTERRUPTS_BCIIMR1A);
652 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
653 TWL4030_INTERRUPTS_BCIIMR2A);
654
655 if (!IS_ERR_OR_NULL(bci->transceiver)) {
656 usb_unregister_notifier(bci->transceiver, &bci->usb_nb);
657 usb_put_phy(bci->transceiver);
658 }
659 free_irq(bci->irq_bci, bci);
660 free_irq(bci->irq_chg, bci);
661 power_supply_unregister(&bci->usb);
662 power_supply_unregister(&bci->ac);
663 kfree(bci);
664
665 return 0;
666}
667
668static const struct of_device_id twl_bci_of_match[] = {
669 {.compatible = "ti,twl4030-bci", },
670 { }
671};
672MODULE_DEVICE_TABLE(of, twl_bci_of_match);
673
674static struct platform_driver twl4030_bci_driver = {
675 .driver = {
676 .name = "twl4030_bci",
677 .owner = THIS_MODULE,
678 .of_match_table = of_match_ptr(twl_bci_of_match),
679 },
680 .remove = __exit_p(twl4030_bci_remove),
681};
682
683module_platform_driver_probe(twl4030_bci_driver, twl4030_bci_probe);
684
685MODULE_AUTHOR("Gražvydas Ignotas");
686MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
687MODULE_LICENSE("GPL");
688MODULE_ALIAS("platform:twl4030_bci");
1/*
2 * TWL4030/TPS65950 BCI (Battery Charger Interface) driver
3 *
4 * Copyright (C) 2010 Gražvydas Ignotas <notasas@gmail.com>
5 *
6 * based on twl4030_bci_battery.c by TI
7 * Copyright (C) 2008 Texas Instruments, Inc.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 */
14
15#include <linux/init.h>
16#include <linux/module.h>
17#include <linux/slab.h>
18#include <linux/err.h>
19#include <linux/platform_device.h>
20#include <linux/interrupt.h>
21#include <linux/i2c/twl.h>
22#include <linux/power_supply.h>
23#include <linux/notifier.h>
24#include <linux/usb/otg.h>
25#include <linux/iio/consumer.h>
26
27#define TWL4030_BCIMDEN 0x00
28#define TWL4030_BCIMDKEY 0x01
29#define TWL4030_BCIMSTATEC 0x02
30#define TWL4030_BCIICHG 0x08
31#define TWL4030_BCIVAC 0x0a
32#define TWL4030_BCIVBUS 0x0c
33#define TWL4030_BCIMFSTS3 0x0F
34#define TWL4030_BCIMFSTS4 0x10
35#define TWL4030_BCICTL1 0x23
36#define TWL4030_BB_CFG 0x12
37#define TWL4030_BCIIREF1 0x27
38#define TWL4030_BCIIREF2 0x28
39#define TWL4030_BCIMFKEY 0x11
40#define TWL4030_BCIMFEN3 0x14
41#define TWL4030_BCIMFTH8 0x1d
42#define TWL4030_BCIMFTH9 0x1e
43#define TWL4030_BCIWDKEY 0x21
44
45#define TWL4030_BCIMFSTS1 0x01
46
47#define TWL4030_BCIAUTOWEN BIT(5)
48#define TWL4030_CONFIG_DONE BIT(4)
49#define TWL4030_CVENAC BIT(2)
50#define TWL4030_BCIAUTOUSB BIT(1)
51#define TWL4030_BCIAUTOAC BIT(0)
52#define TWL4030_CGAIN BIT(5)
53#define TWL4030_USBFASTMCHG BIT(2)
54#define TWL4030_STS_VBUS BIT(7)
55#define TWL4030_STS_USB_ID BIT(2)
56#define TWL4030_BBCHEN BIT(4)
57#define TWL4030_BBSEL_MASK 0x0c
58#define TWL4030_BBSEL_2V5 0x00
59#define TWL4030_BBSEL_3V0 0x04
60#define TWL4030_BBSEL_3V1 0x08
61#define TWL4030_BBSEL_3V2 0x0c
62#define TWL4030_BBISEL_MASK 0x03
63#define TWL4030_BBISEL_25uA 0x00
64#define TWL4030_BBISEL_150uA 0x01
65#define TWL4030_BBISEL_500uA 0x02
66#define TWL4030_BBISEL_1000uA 0x03
67
68#define TWL4030_BATSTSPCHG BIT(2)
69#define TWL4030_BATSTSMCHG BIT(6)
70
71/* BCI interrupts */
72#define TWL4030_WOVF BIT(0) /* Watchdog overflow */
73#define TWL4030_TMOVF BIT(1) /* Timer overflow */
74#define TWL4030_ICHGHIGH BIT(2) /* Battery charge current high */
75#define TWL4030_ICHGLOW BIT(3) /* Battery cc. low / FSM state change */
76#define TWL4030_ICHGEOC BIT(4) /* Battery current end-of-charge */
77#define TWL4030_TBATOR2 BIT(5) /* Battery temperature out of range 2 */
78#define TWL4030_TBATOR1 BIT(6) /* Battery temperature out of range 1 */
79#define TWL4030_BATSTS BIT(7) /* Battery status */
80
81#define TWL4030_VBATLVL BIT(0) /* VBAT level */
82#define TWL4030_VBATOV BIT(1) /* VBAT overvoltage */
83#define TWL4030_VBUSOV BIT(2) /* VBUS overvoltage */
84#define TWL4030_ACCHGOV BIT(3) /* Ac charger overvoltage */
85
86#define TWL4030_MSTATEC_USB BIT(4)
87#define TWL4030_MSTATEC_AC BIT(5)
88#define TWL4030_MSTATEC_MASK 0x0f
89#define TWL4030_MSTATEC_QUICK1 0x02
90#define TWL4030_MSTATEC_QUICK7 0x07
91#define TWL4030_MSTATEC_COMPLETE1 0x0b
92#define TWL4030_MSTATEC_COMPLETE4 0x0e
93
94/*
95 * If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11)
96 * then AC is available.
97 */
98static inline int ac_available(struct iio_channel *channel_vac)
99{
100 int val, err;
101
102 if (!channel_vac)
103 return 0;
104
105 err = iio_read_channel_processed(channel_vac, &val);
106 if (err < 0)
107 return 0;
108 return val > 4500;
109}
110
111static bool allow_usb;
112module_param(allow_usb, bool, 0644);
113MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");
114
115struct twl4030_bci {
116 struct device *dev;
117 struct power_supply *ac;
118 struct power_supply *usb;
119 struct usb_phy *transceiver;
120 struct notifier_block usb_nb;
121 struct work_struct work;
122 int irq_chg;
123 int irq_bci;
124 int usb_enabled;
125
126 /*
127 * ichg_* and *_cur values in uA. If any are 'large', we set
128 * CGAIN to '1' which doubles the range for half the
129 * precision.
130 */
131 unsigned int ichg_eoc, ichg_lo, ichg_hi;
132 unsigned int usb_cur, ac_cur;
133 struct iio_channel *channel_vac;
134 bool ac_is_active;
135 int usb_mode, ac_mode; /* charging mode requested */
136#define CHARGE_OFF 0
137#define CHARGE_AUTO 1
138#define CHARGE_LINEAR 2
139
140 /* When setting the USB current we slowly increase the
141 * requested current until target is reached or the voltage
142 * drops below 4.75V. In the latter case we step back one
143 * step.
144 */
145 unsigned int usb_cur_target;
146 struct delayed_work current_worker;
147#define USB_CUR_STEP 20000 /* 20mA at a time */
148#define USB_MIN_VOLT 4750000 /* 4.75V */
149#define USB_CUR_DELAY msecs_to_jiffies(100)
150#define USB_MAX_CURRENT 1700000 /* TWL4030 caps at 1.7A */
151
152 unsigned long event;
153};
154
155/* strings for 'usb_mode' values */
156static char *modes[] = { "off", "auto", "continuous" };
157
158/*
159 * clear and set bits on an given register on a given module
160 */
161static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg)
162{
163 u8 val = 0;
164 int ret;
165
166 ret = twl_i2c_read_u8(mod_no, &val, reg);
167 if (ret)
168 return ret;
169
170 val &= ~clear;
171 val |= set;
172
173 return twl_i2c_write_u8(mod_no, val, reg);
174}
175
176static int twl4030_bci_read(u8 reg, u8 *val)
177{
178 return twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, val, reg);
179}
180
181static int twl4030_clear_set_boot_bci(u8 clear, u8 set)
182{
183 return twl4030_clear_set(TWL_MODULE_PM_MASTER, clear,
184 TWL4030_CONFIG_DONE | TWL4030_BCIAUTOWEN | set,
185 TWL4030_PM_MASTER_BOOT_BCI);
186}
187
188static int twl4030bci_read_adc_val(u8 reg)
189{
190 int ret, temp;
191 u8 val;
192
193 /* read MSB */
194 ret = twl4030_bci_read(reg + 1, &val);
195 if (ret)
196 return ret;
197
198 temp = (int)(val & 0x03) << 8;
199
200 /* read LSB */
201 ret = twl4030_bci_read(reg, &val);
202 if (ret)
203 return ret;
204
205 return temp | val;
206}
207
208/*
209 * Check if Battery Pack was present
210 */
211static int twl4030_is_battery_present(struct twl4030_bci *bci)
212{
213 int ret;
214 u8 val = 0;
215
216 /* Battery presence in Main charge? */
217 ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, &val, TWL4030_BCIMFSTS3);
218 if (ret)
219 return ret;
220 if (val & TWL4030_BATSTSMCHG)
221 return 0;
222
223 /*
224 * OK, It could be that bootloader did not enable main charger,
225 * pre-charge is h/w auto. So, Battery presence in Pre-charge?
226 */
227 ret = twl_i2c_read_u8(TWL4030_MODULE_PRECHARGE, &val,
228 TWL4030_BCIMFSTS1);
229 if (ret)
230 return ret;
231 if (val & TWL4030_BATSTSPCHG)
232 return 0;
233
234 return -ENODEV;
235}
236
237/*
238 * TI provided formulas:
239 * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85
240 * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7
241 * Here we use integer approximation of:
242 * CGAIN == 0: val * 1.6618 - 0.85 * 1000
243 * CGAIN == 1: (val * 1.6618 - 0.85 * 1000) * 2
244 */
245/*
246 * convert twl register value for currents into uA
247 */
248static int regval2ua(int regval, bool cgain)
249{
250 if (cgain)
251 return (regval * 16618 - 8500 * 1000) / 5;
252 else
253 return (regval * 16618 - 8500 * 1000) / 10;
254}
255
256/*
257 * convert uA currents into twl register value
258 */
259static int ua2regval(int ua, bool cgain)
260{
261 int ret;
262 if (cgain)
263 ua /= 2;
264 ret = (ua * 10 + 8500 * 1000) / 16618;
265 /* rounding problems */
266 if (ret < 512)
267 ret = 512;
268 return ret;
269}
270
271static int twl4030_charger_update_current(struct twl4030_bci *bci)
272{
273 int status;
274 int cur;
275 unsigned reg, cur_reg;
276 u8 bcictl1, oldreg, fullreg;
277 bool cgain = false;
278 u8 boot_bci;
279
280 /*
281 * If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11)
282 * and AC is enabled, set current for 'ac'
283 */
284 if (ac_available(bci->channel_vac)) {
285 cur = bci->ac_cur;
286 bci->ac_is_active = true;
287 } else {
288 cur = bci->usb_cur;
289 bci->ac_is_active = false;
290 if (cur > bci->usb_cur_target) {
291 cur = bci->usb_cur_target;
292 bci->usb_cur = cur;
293 }
294 if (cur < bci->usb_cur_target)
295 schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY);
296 }
297
298 /* First, check thresholds and see if cgain is needed */
299 if (bci->ichg_eoc >= 200000)
300 cgain = true;
301 if (bci->ichg_lo >= 400000)
302 cgain = true;
303 if (bci->ichg_hi >= 820000)
304 cgain = true;
305 if (cur > 852000)
306 cgain = true;
307
308 status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
309 if (status < 0)
310 return status;
311 if (twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &boot_bci,
312 TWL4030_PM_MASTER_BOOT_BCI) < 0)
313 boot_bci = 0;
314 boot_bci &= 7;
315
316 if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN))
317 /* Need to turn for charging while we change the
318 * CGAIN bit. Leave it off while everything is
319 * updated.
320 */
321 twl4030_clear_set_boot_bci(boot_bci, 0);
322
323 /*
324 * For ichg_eoc, the hardware only supports reg values matching
325 * 100XXXX000, and requires the XXXX be stored in the high nibble
326 * of TWL4030_BCIMFTH8.
327 */
328 reg = ua2regval(bci->ichg_eoc, cgain);
329 if (reg > 0x278)
330 reg = 0x278;
331 if (reg < 0x200)
332 reg = 0x200;
333 reg = (reg >> 3) & 0xf;
334 fullreg = reg << 4;
335
336 /*
337 * For ichg_lo, reg value must match 10XXXX0000.
338 * XXXX is stored in low nibble of TWL4030_BCIMFTH8.
339 */
340 reg = ua2regval(bci->ichg_lo, cgain);
341 if (reg > 0x2F0)
342 reg = 0x2F0;
343 if (reg < 0x200)
344 reg = 0x200;
345 reg = (reg >> 4) & 0xf;
346 fullreg |= reg;
347
348 /* ichg_eoc and ichg_lo live in same register */
349 status = twl4030_bci_read(TWL4030_BCIMFTH8, &oldreg);
350 if (status < 0)
351 return status;
352 if (oldreg != fullreg) {
353 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xF4,
354 TWL4030_BCIMFKEY);
355 if (status < 0)
356 return status;
357 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
358 fullreg, TWL4030_BCIMFTH8);
359 }
360
361 /* ichg_hi threshold must be 1XXXX01100 (I think) */
362 reg = ua2regval(bci->ichg_hi, cgain);
363 if (reg > 0x3E0)
364 reg = 0x3E0;
365 if (reg < 0x200)
366 reg = 0x200;
367 fullreg = (reg >> 5) & 0xF;
368 fullreg <<= 4;
369 status = twl4030_bci_read(TWL4030_BCIMFTH9, &oldreg);
370 if (status < 0)
371 return status;
372 if ((oldreg & 0xF0) != fullreg) {
373 fullreg |= (oldreg & 0x0F);
374 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
375 TWL4030_BCIMFKEY);
376 if (status < 0)
377 return status;
378 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
379 fullreg, TWL4030_BCIMFTH9);
380 }
381
382 /*
383 * And finally, set the current. This is stored in
384 * two registers.
385 */
386 reg = ua2regval(cur, cgain);
387 /* we have only 10 bits */
388 if (reg > 0x3ff)
389 reg = 0x3ff;
390 status = twl4030_bci_read(TWL4030_BCIIREF1, &oldreg);
391 if (status < 0)
392 return status;
393 cur_reg = oldreg;
394 status = twl4030_bci_read(TWL4030_BCIIREF2, &oldreg);
395 if (status < 0)
396 return status;
397 cur_reg |= oldreg << 8;
398 if (reg != oldreg) {
399 /* disable write protection for one write access for
400 * BCIIREF */
401 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
402 TWL4030_BCIMFKEY);
403 if (status < 0)
404 return status;
405 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
406 (reg & 0x100) ? 3 : 2,
407 TWL4030_BCIIREF2);
408 if (status < 0)
409 return status;
410 /* disable write protection for one write access for
411 * BCIIREF */
412 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
413 TWL4030_BCIMFKEY);
414 if (status < 0)
415 return status;
416 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
417 reg & 0xff,
418 TWL4030_BCIIREF1);
419 }
420 if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN)) {
421 /* Flip CGAIN and re-enable charging */
422 bcictl1 ^= TWL4030_CGAIN;
423 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
424 bcictl1, TWL4030_BCICTL1);
425 twl4030_clear_set_boot_bci(0, boot_bci);
426 }
427 return 0;
428}
429
430static int twl4030_charger_get_current(void);
431
432static void twl4030_current_worker(struct work_struct *data)
433{
434 int v, curr;
435 int res;
436 struct twl4030_bci *bci = container_of(data, struct twl4030_bci,
437 current_worker.work);
438
439 res = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
440 if (res < 0)
441 v = 0;
442 else
443 /* BCIVBUS uses ADCIN8, 7/1023 V/step */
444 v = res * 6843;
445 curr = twl4030_charger_get_current();
446
447 dev_dbg(bci->dev, "v=%d cur=%d limit=%d target=%d\n", v, curr,
448 bci->usb_cur, bci->usb_cur_target);
449
450 if (v < USB_MIN_VOLT) {
451 /* Back up and stop adjusting. */
452 bci->usb_cur -= USB_CUR_STEP;
453 bci->usb_cur_target = bci->usb_cur;
454 } else if (bci->usb_cur >= bci->usb_cur_target ||
455 bci->usb_cur + USB_CUR_STEP > USB_MAX_CURRENT) {
456 /* Reached target and voltage is OK - stop */
457 return;
458 } else {
459 bci->usb_cur += USB_CUR_STEP;
460 schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY);
461 }
462 twl4030_charger_update_current(bci);
463}
464
465/*
466 * Enable/Disable USB Charge functionality.
467 */
468static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
469{
470 int ret;
471
472 if (bci->usb_mode == CHARGE_OFF)
473 enable = false;
474 if (enable && !IS_ERR_OR_NULL(bci->transceiver)) {
475
476 twl4030_charger_update_current(bci);
477
478 /* Need to keep phy powered */
479 if (!bci->usb_enabled) {
480 pm_runtime_get_sync(bci->transceiver->dev);
481 bci->usb_enabled = 1;
482 }
483
484 if (bci->usb_mode == CHARGE_AUTO)
485 /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
486 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
487
488 /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
489 ret = twl4030_clear_set(TWL_MODULE_MAIN_CHARGE, 0,
490 TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
491 if (bci->usb_mode == CHARGE_LINEAR) {
492 twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC|TWL4030_CVENAC, 0);
493 /* Watch dog key: WOVF acknowledge */
494 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x33,
495 TWL4030_BCIWDKEY);
496 /* 0x24 + EKEY6: off mode */
497 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a,
498 TWL4030_BCIMDKEY);
499 /* EKEY2: Linear charge: USB path */
500 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x26,
501 TWL4030_BCIMDKEY);
502 /* WDKEY5: stop watchdog count */
503 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf3,
504 TWL4030_BCIWDKEY);
505 /* enable MFEN3 access */
506 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x9c,
507 TWL4030_BCIMFKEY);
508 /* ICHGEOCEN - end-of-charge monitor (current < 80mA)
509 * (charging continues)
510 * ICHGLOWEN - current level monitor (charge continues)
511 * don't monitor over-current or heat save
512 */
513 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf0,
514 TWL4030_BCIMFEN3);
515 }
516 } else {
517 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
518 ret |= twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a,
519 TWL4030_BCIMDKEY);
520 if (bci->usb_enabled) {
521 pm_runtime_mark_last_busy(bci->transceiver->dev);
522 pm_runtime_put_autosuspend(bci->transceiver->dev);
523 bci->usb_enabled = 0;
524 }
525 bci->usb_cur = 0;
526 }
527
528 return ret;
529}
530
531/*
532 * Enable/Disable AC Charge funtionality.
533 */
534static int twl4030_charger_enable_ac(struct twl4030_bci *bci, bool enable)
535{
536 int ret;
537
538 if (bci->ac_mode == CHARGE_OFF)
539 enable = false;
540
541 if (enable)
542 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
543 else
544 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
545
546 return ret;
547}
548
549/*
550 * Enable/Disable charging of Backup Battery.
551 */
552static int twl4030_charger_enable_backup(int uvolt, int uamp)
553{
554 int ret;
555 u8 flags;
556
557 if (uvolt < 2500000 ||
558 uamp < 25) {
559 /* disable charging of backup battery */
560 ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
561 TWL4030_BBCHEN, 0, TWL4030_BB_CFG);
562 return ret;
563 }
564
565 flags = TWL4030_BBCHEN;
566 if (uvolt >= 3200000)
567 flags |= TWL4030_BBSEL_3V2;
568 else if (uvolt >= 3100000)
569 flags |= TWL4030_BBSEL_3V1;
570 else if (uvolt >= 3000000)
571 flags |= TWL4030_BBSEL_3V0;
572 else
573 flags |= TWL4030_BBSEL_2V5;
574
575 if (uamp >= 1000)
576 flags |= TWL4030_BBISEL_1000uA;
577 else if (uamp >= 500)
578 flags |= TWL4030_BBISEL_500uA;
579 else if (uamp >= 150)
580 flags |= TWL4030_BBISEL_150uA;
581 else
582 flags |= TWL4030_BBISEL_25uA;
583
584 ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
585 TWL4030_BBSEL_MASK | TWL4030_BBISEL_MASK,
586 flags,
587 TWL4030_BB_CFG);
588
589 return ret;
590}
591
592/*
593 * TWL4030 CHG_PRES (AC charger presence) events
594 */
595static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
596{
597 struct twl4030_bci *bci = arg;
598
599 dev_dbg(bci->dev, "CHG_PRES irq\n");
600 /* reset current on each 'plug' event */
601 bci->ac_cur = 500000;
602 twl4030_charger_update_current(bci);
603 power_supply_changed(bci->ac);
604 power_supply_changed(bci->usb);
605
606 return IRQ_HANDLED;
607}
608
609/*
610 * TWL4030 BCI monitoring events
611 */
612static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
613{
614 struct twl4030_bci *bci = arg;
615 u8 irqs1, irqs2;
616 int ret;
617
618 ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
619 TWL4030_INTERRUPTS_BCIISR1A);
620 if (ret < 0)
621 return IRQ_HANDLED;
622
623 ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
624 TWL4030_INTERRUPTS_BCIISR2A);
625 if (ret < 0)
626 return IRQ_HANDLED;
627
628 dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);
629
630 if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) {
631 /* charger state change, inform the core */
632 power_supply_changed(bci->ac);
633 power_supply_changed(bci->usb);
634 }
635 twl4030_charger_update_current(bci);
636
637 /* various monitoring events, for now we just log them here */
638 if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1))
639 dev_warn(bci->dev, "battery temperature out of range\n");
640
641 if (irqs1 & TWL4030_BATSTS)
642 dev_crit(bci->dev, "battery disconnected\n");
643
644 if (irqs2 & TWL4030_VBATOV)
645 dev_crit(bci->dev, "VBAT overvoltage\n");
646
647 if (irqs2 & TWL4030_VBUSOV)
648 dev_crit(bci->dev, "VBUS overvoltage\n");
649
650 if (irqs2 & TWL4030_ACCHGOV)
651 dev_crit(bci->dev, "Ac charger overvoltage\n");
652
653 return IRQ_HANDLED;
654}
655
656/*
657 * Provide "max_current" attribute in sysfs.
658 */
659static ssize_t
660twl4030_bci_max_current_store(struct device *dev, struct device_attribute *attr,
661 const char *buf, size_t n)
662{
663 struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
664 int cur = 0;
665 int status = 0;
666 status = kstrtoint(buf, 10, &cur);
667 if (status)
668 return status;
669 if (cur < 0)
670 return -EINVAL;
671 if (dev == &bci->ac->dev)
672 bci->ac_cur = cur;
673 else
674 bci->usb_cur_target = cur;
675
676 twl4030_charger_update_current(bci);
677 return n;
678}
679
680/*
681 * sysfs max_current show
682 */
683static ssize_t twl4030_bci_max_current_show(struct device *dev,
684 struct device_attribute *attr, char *buf)
685{
686 int status = 0;
687 int cur = -1;
688 u8 bcictl1;
689 struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
690
691 if (dev == &bci->ac->dev) {
692 if (!bci->ac_is_active)
693 cur = bci->ac_cur;
694 } else {
695 if (bci->ac_is_active)
696 cur = bci->usb_cur_target;
697 }
698 if (cur < 0) {
699 cur = twl4030bci_read_adc_val(TWL4030_BCIIREF1);
700 if (cur < 0)
701 return cur;
702 status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
703 if (status < 0)
704 return status;
705 cur = regval2ua(cur, bcictl1 & TWL4030_CGAIN);
706 }
707 return scnprintf(buf, PAGE_SIZE, "%u\n", cur);
708}
709
710static DEVICE_ATTR(max_current, 0644, twl4030_bci_max_current_show,
711 twl4030_bci_max_current_store);
712
713static void twl4030_bci_usb_work(struct work_struct *data)
714{
715 struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
716
717 switch (bci->event) {
718 case USB_EVENT_VBUS:
719 case USB_EVENT_CHARGER:
720 twl4030_charger_enable_usb(bci, true);
721 break;
722 case USB_EVENT_NONE:
723 twl4030_charger_enable_usb(bci, false);
724 break;
725 }
726}
727
728static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
729 void *priv)
730{
731 struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb);
732
733 dev_dbg(bci->dev, "OTG notify %lu\n", val);
734
735 /* reset current on each 'plug' event */
736 if (allow_usb)
737 bci->usb_cur_target = 500000;
738 else
739 bci->usb_cur_target = 100000;
740
741 bci->event = val;
742 schedule_work(&bci->work);
743
744 return NOTIFY_OK;
745}
746
747/*
748 * sysfs charger enabled store
749 */
750static ssize_t
751twl4030_bci_mode_store(struct device *dev, struct device_attribute *attr,
752 const char *buf, size_t n)
753{
754 struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
755 int mode;
756 int status;
757
758 if (sysfs_streq(buf, modes[0]))
759 mode = 0;
760 else if (sysfs_streq(buf, modes[1]))
761 mode = 1;
762 else if (sysfs_streq(buf, modes[2]))
763 mode = 2;
764 else
765 return -EINVAL;
766 if (dev == &bci->ac->dev) {
767 if (mode == 2)
768 return -EINVAL;
769 twl4030_charger_enable_ac(bci, false);
770 bci->ac_mode = mode;
771 status = twl4030_charger_enable_ac(bci, true);
772 } else {
773 twl4030_charger_enable_usb(bci, false);
774 bci->usb_mode = mode;
775 status = twl4030_charger_enable_usb(bci, true);
776 }
777 return (status == 0) ? n : status;
778}
779
780/*
781 * sysfs charger enabled show
782 */
783static ssize_t
784twl4030_bci_mode_show(struct device *dev,
785 struct device_attribute *attr, char *buf)
786{
787 struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
788 int len = 0;
789 int i;
790 int mode = bci->usb_mode;
791
792 if (dev == &bci->ac->dev)
793 mode = bci->ac_mode;
794
795 for (i = 0; i < ARRAY_SIZE(modes); i++)
796 if (mode == i)
797 len += snprintf(buf+len, PAGE_SIZE-len,
798 "[%s] ", modes[i]);
799 else
800 len += snprintf(buf+len, PAGE_SIZE-len,
801 "%s ", modes[i]);
802 buf[len-1] = '\n';
803 return len;
804}
805static DEVICE_ATTR(mode, 0644, twl4030_bci_mode_show,
806 twl4030_bci_mode_store);
807
808static int twl4030_charger_get_current(void)
809{
810 int curr;
811 int ret;
812 u8 bcictl1;
813
814 curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
815 if (curr < 0)
816 return curr;
817
818 ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
819 if (ret)
820 return ret;
821
822 return regval2ua(curr, bcictl1 & TWL4030_CGAIN);
823}
824
825/*
826 * Returns the main charge FSM state
827 * Or < 0 on failure.
828 */
829static int twl4030bci_state(struct twl4030_bci *bci)
830{
831 int ret;
832 u8 state;
833
834 ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
835 if (ret) {
836 pr_err("twl4030_bci: error reading BCIMSTATEC\n");
837 return ret;
838 }
839
840 dev_dbg(bci->dev, "state: %02x\n", state);
841
842 return state;
843}
844
845static int twl4030_bci_state_to_status(int state)
846{
847 state &= TWL4030_MSTATEC_MASK;
848 if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
849 return POWER_SUPPLY_STATUS_CHARGING;
850 else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
851 state <= TWL4030_MSTATEC_COMPLETE4)
852 return POWER_SUPPLY_STATUS_FULL;
853 else
854 return POWER_SUPPLY_STATUS_NOT_CHARGING;
855}
856
857static int twl4030_bci_get_property(struct power_supply *psy,
858 enum power_supply_property psp,
859 union power_supply_propval *val)
860{
861 struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent);
862 int is_charging;
863 int state;
864 int ret;
865
866 state = twl4030bci_state(bci);
867 if (state < 0)
868 return state;
869
870 if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
871 is_charging = state & TWL4030_MSTATEC_USB;
872 else
873 is_charging = state & TWL4030_MSTATEC_AC;
874 if (!is_charging) {
875 u8 s;
876 twl4030_bci_read(TWL4030_BCIMDEN, &s);
877 if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
878 is_charging = s & 1;
879 else
880 is_charging = s & 2;
881 if (is_charging)
882 /* A little white lie */
883 state = TWL4030_MSTATEC_QUICK1;
884 }
885
886 switch (psp) {
887 case POWER_SUPPLY_PROP_STATUS:
888 if (is_charging)
889 val->intval = twl4030_bci_state_to_status(state);
890 else
891 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
892 break;
893 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
894 /* charging must be active for meaningful result */
895 if (!is_charging)
896 return -ENODATA;
897 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) {
898 ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
899 if (ret < 0)
900 return ret;
901 /* BCIVBUS uses ADCIN8, 7/1023 V/step */
902 val->intval = ret * 6843;
903 } else {
904 ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
905 if (ret < 0)
906 return ret;
907 /* BCIVAC uses ADCIN11, 10/1023 V/step */
908 val->intval = ret * 9775;
909 }
910 break;
911 case POWER_SUPPLY_PROP_CURRENT_NOW:
912 if (!is_charging)
913 return -ENODATA;
914 /* current measurement is shared between AC and USB */
915 ret = twl4030_charger_get_current();
916 if (ret < 0)
917 return ret;
918 val->intval = ret;
919 break;
920 case POWER_SUPPLY_PROP_ONLINE:
921 val->intval = is_charging &&
922 twl4030_bci_state_to_status(state) !=
923 POWER_SUPPLY_STATUS_NOT_CHARGING;
924 break;
925 default:
926 return -EINVAL;
927 }
928
929 return 0;
930}
931
932static enum power_supply_property twl4030_charger_props[] = {
933 POWER_SUPPLY_PROP_STATUS,
934 POWER_SUPPLY_PROP_ONLINE,
935 POWER_SUPPLY_PROP_VOLTAGE_NOW,
936 POWER_SUPPLY_PROP_CURRENT_NOW,
937};
938
939#ifdef CONFIG_OF
940static const struct twl4030_bci_platform_data *
941twl4030_bci_parse_dt(struct device *dev)
942{
943 struct device_node *np = dev->of_node;
944 struct twl4030_bci_platform_data *pdata;
945 u32 num;
946
947 if (!np)
948 return NULL;
949 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
950 if (!pdata)
951 return pdata;
952
953 if (of_property_read_u32(np, "ti,bb-uvolt", &num) == 0)
954 pdata->bb_uvolt = num;
955 if (of_property_read_u32(np, "ti,bb-uamp", &num) == 0)
956 pdata->bb_uamp = num;
957 return pdata;
958}
959#else
960static inline const struct twl4030_bci_platform_data *
961twl4030_bci_parse_dt(struct device *dev)
962{
963 return NULL;
964}
965#endif
966
967static const struct power_supply_desc twl4030_bci_ac_desc = {
968 .name = "twl4030_ac",
969 .type = POWER_SUPPLY_TYPE_MAINS,
970 .properties = twl4030_charger_props,
971 .num_properties = ARRAY_SIZE(twl4030_charger_props),
972 .get_property = twl4030_bci_get_property,
973};
974
975static const struct power_supply_desc twl4030_bci_usb_desc = {
976 .name = "twl4030_usb",
977 .type = POWER_SUPPLY_TYPE_USB,
978 .properties = twl4030_charger_props,
979 .num_properties = ARRAY_SIZE(twl4030_charger_props),
980 .get_property = twl4030_bci_get_property,
981};
982
983static int twl4030_bci_probe(struct platform_device *pdev)
984{
985 struct twl4030_bci *bci;
986 const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;
987 int ret;
988 u32 reg;
989
990 bci = devm_kzalloc(&pdev->dev, sizeof(*bci), GFP_KERNEL);
991 if (bci == NULL)
992 return -ENOMEM;
993
994 if (!pdata)
995 pdata = twl4030_bci_parse_dt(&pdev->dev);
996
997 bci->ichg_eoc = 80100; /* Stop charging when current drops to here */
998 bci->ichg_lo = 241000; /* Low threshold */
999 bci->ichg_hi = 500000; /* High threshold */
1000 bci->ac_cur = 500000; /* 500mA */
1001 if (allow_usb)
1002 bci->usb_cur_target = 500000; /* 500mA */
1003 else
1004 bci->usb_cur_target = 100000; /* 100mA */
1005 bci->usb_mode = CHARGE_AUTO;
1006 bci->ac_mode = CHARGE_AUTO;
1007
1008 bci->dev = &pdev->dev;
1009 bci->irq_chg = platform_get_irq(pdev, 0);
1010 bci->irq_bci = platform_get_irq(pdev, 1);
1011
1012 /* Only proceed further *IF* battery is physically present */
1013 ret = twl4030_is_battery_present(bci);
1014 if (ret) {
1015 dev_crit(&pdev->dev, "Battery was not detected:%d\n", ret);
1016 return ret;
1017 }
1018
1019 platform_set_drvdata(pdev, bci);
1020
1021 bci->ac = devm_power_supply_register(&pdev->dev, &twl4030_bci_ac_desc,
1022 NULL);
1023 if (IS_ERR(bci->ac)) {
1024 ret = PTR_ERR(bci->ac);
1025 dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
1026 return ret;
1027 }
1028
1029 bci->usb = devm_power_supply_register(&pdev->dev, &twl4030_bci_usb_desc,
1030 NULL);
1031 if (IS_ERR(bci->usb)) {
1032 ret = PTR_ERR(bci->usb);
1033 dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
1034 return ret;
1035 }
1036
1037 ret = devm_request_threaded_irq(&pdev->dev, bci->irq_chg, NULL,
1038 twl4030_charger_interrupt, IRQF_ONESHOT, pdev->name,
1039 bci);
1040 if (ret < 0) {
1041 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
1042 bci->irq_chg, ret);
1043 return ret;
1044 }
1045
1046 ret = devm_request_threaded_irq(&pdev->dev, bci->irq_bci, NULL,
1047 twl4030_bci_interrupt, IRQF_ONESHOT, pdev->name, bci);
1048 if (ret < 0) {
1049 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
1050 bci->irq_bci, ret);
1051 return ret;
1052 }
1053
1054 bci->channel_vac = iio_channel_get(&pdev->dev, "vac");
1055 if (IS_ERR(bci->channel_vac)) {
1056 bci->channel_vac = NULL;
1057 dev_warn(&pdev->dev, "could not request vac iio channel");
1058 }
1059
1060 INIT_WORK(&bci->work, twl4030_bci_usb_work);
1061 INIT_DELAYED_WORK(&bci->current_worker, twl4030_current_worker);
1062
1063 bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
1064 if (bci->dev->of_node) {
1065 struct device_node *phynode;
1066
1067 phynode = of_find_compatible_node(bci->dev->of_node->parent,
1068 NULL, "ti,twl4030-usb");
1069 if (phynode)
1070 bci->transceiver = devm_usb_get_phy_by_node(
1071 bci->dev, phynode, &bci->usb_nb);
1072 }
1073
1074 /* Enable interrupts now. */
1075 reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 |
1076 TWL4030_TBATOR1 | TWL4030_BATSTS);
1077 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
1078 TWL4030_INTERRUPTS_BCIIMR1A);
1079 if (ret < 0) {
1080 dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
1081 goto fail;
1082 }
1083
1084 reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV);
1085 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
1086 TWL4030_INTERRUPTS_BCIIMR2A);
1087 if (ret < 0)
1088 dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
1089
1090 twl4030_charger_update_current(bci);
1091 if (device_create_file(&bci->usb->dev, &dev_attr_max_current))
1092 dev_warn(&pdev->dev, "could not create sysfs file\n");
1093 if (device_create_file(&bci->usb->dev, &dev_attr_mode))
1094 dev_warn(&pdev->dev, "could not create sysfs file\n");
1095 if (device_create_file(&bci->ac->dev, &dev_attr_mode))
1096 dev_warn(&pdev->dev, "could not create sysfs file\n");
1097 if (device_create_file(&bci->ac->dev, &dev_attr_max_current))
1098 dev_warn(&pdev->dev, "could not create sysfs file\n");
1099
1100 twl4030_charger_enable_ac(bci, true);
1101 if (!IS_ERR_OR_NULL(bci->transceiver))
1102 twl4030_bci_usb_ncb(&bci->usb_nb,
1103 bci->transceiver->last_event,
1104 NULL);
1105 else
1106 twl4030_charger_enable_usb(bci, false);
1107 if (pdata)
1108 twl4030_charger_enable_backup(pdata->bb_uvolt,
1109 pdata->bb_uamp);
1110 else
1111 twl4030_charger_enable_backup(0, 0);
1112
1113 return 0;
1114fail:
1115 iio_channel_release(bci->channel_vac);
1116
1117 return ret;
1118}
1119
1120static int __exit twl4030_bci_remove(struct platform_device *pdev)
1121{
1122 struct twl4030_bci *bci = platform_get_drvdata(pdev);
1123
1124 twl4030_charger_enable_ac(bci, false);
1125 twl4030_charger_enable_usb(bci, false);
1126 twl4030_charger_enable_backup(0, 0);
1127
1128 iio_channel_release(bci->channel_vac);
1129
1130 device_remove_file(&bci->usb->dev, &dev_attr_max_current);
1131 device_remove_file(&bci->usb->dev, &dev_attr_mode);
1132 device_remove_file(&bci->ac->dev, &dev_attr_max_current);
1133 device_remove_file(&bci->ac->dev, &dev_attr_mode);
1134 /* mask interrupts */
1135 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
1136 TWL4030_INTERRUPTS_BCIIMR1A);
1137 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
1138 TWL4030_INTERRUPTS_BCIIMR2A);
1139
1140 return 0;
1141}
1142
1143static const struct of_device_id twl_bci_of_match[] = {
1144 {.compatible = "ti,twl4030-bci", },
1145 { }
1146};
1147MODULE_DEVICE_TABLE(of, twl_bci_of_match);
1148
1149static struct platform_driver twl4030_bci_driver = {
1150 .probe = twl4030_bci_probe,
1151 .driver = {
1152 .name = "twl4030_bci",
1153 .of_match_table = of_match_ptr(twl_bci_of_match),
1154 },
1155 .remove = __exit_p(twl4030_bci_remove),
1156};
1157module_platform_driver(twl4030_bci_driver);
1158
1159MODULE_AUTHOR("Gražvydas Ignotas");
1160MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
1161MODULE_LICENSE("GPL");
1162MODULE_ALIAS("platform:twl4030_bci");