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_BCIMFSTS3 0x0F
32 #define TWL4030_BCIMFSTS4 0x10
33 #define TWL4030_BCICTL1 0x23
34 #define TWL4030_BB_CFG 0x12
35
36 #define TWL4030_BCIMFSTS1 0x01
37
38 #define TWL4030_BCIAUTOWEN BIT(5)
39 #define TWL4030_CONFIG_DONE BIT(4)
40 #define TWL4030_BCIAUTOUSB BIT(1)
41 #define TWL4030_BCIAUTOAC BIT(0)
42 #define TWL4030_CGAIN BIT(5)
43 #define TWL4030_USBFASTMCHG BIT(2)
44 #define TWL4030_STS_VBUS BIT(7)
45 #define TWL4030_STS_USB_ID BIT(2)
46 #define TWL4030_BBCHEN BIT(4)
47 #define TWL4030_BBSEL_MASK 0x0c
48 #define TWL4030_BBSEL_2V5 0x00
49 #define TWL4030_BBSEL_3V0 0x04
50 #define TWL4030_BBSEL_3V1 0x08
51 #define TWL4030_BBSEL_3V2 0x0c
52 #define TWL4030_BBISEL_MASK 0x03
53 #define TWL4030_BBISEL_25uA 0x00
54 #define TWL4030_BBISEL_150uA 0x01
55 #define TWL4030_BBISEL_500uA 0x02
56 #define TWL4030_BBISEL_1000uA 0x03
57
58 #define TWL4030_BATSTSPCHG BIT(2)
59 #define TWL4030_BATSTSMCHG BIT(6)
60
61 /* BCI interrupts */
62 #define TWL4030_WOVF BIT(0) /* Watchdog overflow */
63 #define TWL4030_TMOVF BIT(1) /* Timer overflow */
64 #define TWL4030_ICHGHIGH BIT(2) /* Battery charge current high */
65 #define TWL4030_ICHGLOW BIT(3) /* Battery cc. low / FSM state change */
66 #define TWL4030_ICHGEOC BIT(4) /* Battery current end-of-charge */
67 #define TWL4030_TBATOR2 BIT(5) /* Battery temperature out of range 2 */
68 #define TWL4030_TBATOR1 BIT(6) /* Battery temperature out of range 1 */
69 #define TWL4030_BATSTS BIT(7) /* Battery status */
70
71 #define TWL4030_VBATLVL BIT(0) /* VBAT level */
72 #define TWL4030_VBATOV BIT(1) /* VBAT overvoltage */
73 #define TWL4030_VBUSOV BIT(2) /* VBUS overvoltage */
74 #define TWL4030_ACCHGOV BIT(3) /* Ac charger overvoltage */
75
76 #define TWL4030_MSTATEC_USB BIT(4)
77 #define TWL4030_MSTATEC_AC BIT(5)
78 #define TWL4030_MSTATEC_MASK 0x0f
79 #define TWL4030_MSTATEC_QUICK1 0x02
80 #define TWL4030_MSTATEC_QUICK7 0x07
81 #define TWL4030_MSTATEC_COMPLETE1 0x0b
82 #define TWL4030_MSTATEC_COMPLETE4 0x0e
83
84 static bool allow_usb;
85 module_param(allow_usb, bool, 0644);
86 MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");
87
88 struct twl4030_bci {
89 struct device *dev;
90 struct power_supply *ac;
91 struct power_supply *usb;
92 struct usb_phy *transceiver;
93 struct notifier_block usb_nb;
94 struct work_struct work;
95 int irq_chg;
96 int irq_bci;
97 struct regulator *usb_reg;
98 int usb_enabled;
99
100 unsigned long event;
101 };
102
103 /*
104 * clear and set bits on an given register on a given module
105 */
twl4030_clear_set(u8 mod_no,u8 clear,u8 set,u8 reg)106 static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg)
107 {
108 u8 val = 0;
109 int ret;
110
111 ret = twl_i2c_read_u8(mod_no, &val, reg);
112 if (ret)
113 return ret;
114
115 val &= ~clear;
116 val |= set;
117
118 return twl_i2c_write_u8(mod_no, val, reg);
119 }
120
twl4030_bci_read(u8 reg,u8 * val)121 static int twl4030_bci_read(u8 reg, u8 *val)
122 {
123 return twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, val, reg);
124 }
125
twl4030_clear_set_boot_bci(u8 clear,u8 set)126 static int twl4030_clear_set_boot_bci(u8 clear, u8 set)
127 {
128 return twl4030_clear_set(TWL_MODULE_PM_MASTER, clear,
129 TWL4030_CONFIG_DONE | TWL4030_BCIAUTOWEN | set,
130 TWL4030_PM_MASTER_BOOT_BCI);
131 }
132
twl4030bci_read_adc_val(u8 reg)133 static int twl4030bci_read_adc_val(u8 reg)
134 {
135 int ret, temp;
136 u8 val;
137
138 /* read MSB */
139 ret = twl4030_bci_read(reg + 1, &val);
140 if (ret)
141 return ret;
142
143 temp = (int)(val & 0x03) << 8;
144
145 /* read LSB */
146 ret = twl4030_bci_read(reg, &val);
147 if (ret)
148 return ret;
149
150 return temp | val;
151 }
152
153 /*
154 * Check if Battery Pack was present
155 */
twl4030_is_battery_present(struct twl4030_bci * bci)156 static int twl4030_is_battery_present(struct twl4030_bci *bci)
157 {
158 int ret;
159 u8 val = 0;
160
161 /* Battery presence in Main charge? */
162 ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, &val, TWL4030_BCIMFSTS3);
163 if (ret)
164 return ret;
165 if (val & TWL4030_BATSTSMCHG)
166 return 0;
167
168 /*
169 * OK, It could be that bootloader did not enable main charger,
170 * pre-charge is h/w auto. So, Battery presence in Pre-charge?
171 */
172 ret = twl_i2c_read_u8(TWL4030_MODULE_PRECHARGE, &val,
173 TWL4030_BCIMFSTS1);
174 if (ret)
175 return ret;
176 if (val & TWL4030_BATSTSPCHG)
177 return 0;
178
179 return -ENODEV;
180 }
181
182 /*
183 * Check if VBUS power is present
184 */
twl4030_bci_have_vbus(struct twl4030_bci * bci)185 static int twl4030_bci_have_vbus(struct twl4030_bci *bci)
186 {
187 int ret;
188 u8 hwsts;
189
190 ret = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &hwsts,
191 TWL4030_PM_MASTER_STS_HW_CONDITIONS);
192 if (ret < 0)
193 return 0;
194
195 dev_dbg(bci->dev, "check_vbus: HW_CONDITIONS %02x\n", hwsts);
196
197 /* in case we also have STS_USB_ID, VBUS is driven by TWL itself */
198 if ((hwsts & TWL4030_STS_VBUS) && !(hwsts & TWL4030_STS_USB_ID))
199 return 1;
200
201 return 0;
202 }
203
204 /*
205 * Enable/Disable USB Charge functionality.
206 */
twl4030_charger_enable_usb(struct twl4030_bci * bci,bool enable)207 static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
208 {
209 int ret;
210
211 if (enable) {
212 /* Check for USB charger connected */
213 if (!twl4030_bci_have_vbus(bci))
214 return -ENODEV;
215
216 /*
217 * Until we can find out what current the device can provide,
218 * require a module param to enable USB charging.
219 */
220 if (!allow_usb) {
221 dev_warn(bci->dev, "USB charging is disabled.\n");
222 return -EACCES;
223 }
224
225 /* Need to keep regulator on */
226 if (!bci->usb_enabled) {
227 ret = regulator_enable(bci->usb_reg);
228 if (ret) {
229 dev_err(bci->dev,
230 "Failed to enable regulator\n");
231 return ret;
232 }
233 bci->usb_enabled = 1;
234 }
235
236 /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
237 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
238 if (ret < 0)
239 return ret;
240
241 /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
242 ret = twl4030_clear_set(TWL_MODULE_MAIN_CHARGE, 0,
243 TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
244 } else {
245 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
246 if (bci->usb_enabled) {
247 regulator_disable(bci->usb_reg);
248 bci->usb_enabled = 0;
249 }
250 }
251
252 return ret;
253 }
254
255 /*
256 * Enable/Disable AC Charge funtionality.
257 */
twl4030_charger_enable_ac(bool enable)258 static int twl4030_charger_enable_ac(bool enable)
259 {
260 int ret;
261
262 if (enable)
263 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
264 else
265 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
266
267 return ret;
268 }
269
270 /*
271 * Enable/Disable charging of Backup Battery.
272 */
twl4030_charger_enable_backup(int uvolt,int uamp)273 static int twl4030_charger_enable_backup(int uvolt, int uamp)
274 {
275 int ret;
276 u8 flags;
277
278 if (uvolt < 2500000 ||
279 uamp < 25) {
280 /* disable charging of backup battery */
281 ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
282 TWL4030_BBCHEN, 0, TWL4030_BB_CFG);
283 return ret;
284 }
285
286 flags = TWL4030_BBCHEN;
287 if (uvolt >= 3200000)
288 flags |= TWL4030_BBSEL_3V2;
289 else if (uvolt >= 3100000)
290 flags |= TWL4030_BBSEL_3V1;
291 else if (uvolt >= 3000000)
292 flags |= TWL4030_BBSEL_3V0;
293 else
294 flags |= TWL4030_BBSEL_2V5;
295
296 if (uamp >= 1000)
297 flags |= TWL4030_BBISEL_1000uA;
298 else if (uamp >= 500)
299 flags |= TWL4030_BBISEL_500uA;
300 else if (uamp >= 150)
301 flags |= TWL4030_BBISEL_150uA;
302 else
303 flags |= TWL4030_BBISEL_25uA;
304
305 ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
306 TWL4030_BBSEL_MASK | TWL4030_BBISEL_MASK,
307 flags,
308 TWL4030_BB_CFG);
309
310 return ret;
311 }
312
313 /*
314 * TWL4030 CHG_PRES (AC charger presence) events
315 */
twl4030_charger_interrupt(int irq,void * arg)316 static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
317 {
318 struct twl4030_bci *bci = arg;
319
320 dev_dbg(bci->dev, "CHG_PRES irq\n");
321 power_supply_changed(bci->ac);
322 power_supply_changed(bci->usb);
323
324 return IRQ_HANDLED;
325 }
326
327 /*
328 * TWL4030 BCI monitoring events
329 */
twl4030_bci_interrupt(int irq,void * arg)330 static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
331 {
332 struct twl4030_bci *bci = arg;
333 u8 irqs1, irqs2;
334 int ret;
335
336 ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
337 TWL4030_INTERRUPTS_BCIISR1A);
338 if (ret < 0)
339 return IRQ_HANDLED;
340
341 ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
342 TWL4030_INTERRUPTS_BCIISR2A);
343 if (ret < 0)
344 return IRQ_HANDLED;
345
346 dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);
347
348 if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) {
349 /* charger state change, inform the core */
350 power_supply_changed(bci->ac);
351 power_supply_changed(bci->usb);
352 }
353
354 /* various monitoring events, for now we just log them here */
355 if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1))
356 dev_warn(bci->dev, "battery temperature out of range\n");
357
358 if (irqs1 & TWL4030_BATSTS)
359 dev_crit(bci->dev, "battery disconnected\n");
360
361 if (irqs2 & TWL4030_VBATOV)
362 dev_crit(bci->dev, "VBAT overvoltage\n");
363
364 if (irqs2 & TWL4030_VBUSOV)
365 dev_crit(bci->dev, "VBUS overvoltage\n");
366
367 if (irqs2 & TWL4030_ACCHGOV)
368 dev_crit(bci->dev, "Ac charger overvoltage\n");
369
370 return IRQ_HANDLED;
371 }
372
twl4030_bci_usb_work(struct work_struct * data)373 static void twl4030_bci_usb_work(struct work_struct *data)
374 {
375 struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
376
377 switch (bci->event) {
378 case USB_EVENT_VBUS:
379 case USB_EVENT_CHARGER:
380 twl4030_charger_enable_usb(bci, true);
381 break;
382 case USB_EVENT_NONE:
383 twl4030_charger_enable_usb(bci, false);
384 break;
385 }
386 }
387
twl4030_bci_usb_ncb(struct notifier_block * nb,unsigned long val,void * priv)388 static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
389 void *priv)
390 {
391 struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb);
392
393 dev_dbg(bci->dev, "OTG notify %lu\n", val);
394
395 bci->event = val;
396 schedule_work(&bci->work);
397
398 return NOTIFY_OK;
399 }
400
401 /*
402 * TI provided formulas:
403 * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85
404 * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7
405 * Here we use integer approximation of:
406 * CGAIN == 0: val * 1.6618 - 0.85
407 * CGAIN == 1: (val * 1.6618 - 0.85) * 2
408 */
twl4030_charger_get_current(void)409 static int twl4030_charger_get_current(void)
410 {
411 int curr;
412 int ret;
413 u8 bcictl1;
414
415 curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
416 if (curr < 0)
417 return curr;
418
419 ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
420 if (ret)
421 return ret;
422
423 ret = (curr * 16618 - 850 * 10000) / 10;
424 if (bcictl1 & TWL4030_CGAIN)
425 ret *= 2;
426
427 return ret;
428 }
429
430 /*
431 * Returns the main charge FSM state
432 * Or < 0 on failure.
433 */
twl4030bci_state(struct twl4030_bci * bci)434 static int twl4030bci_state(struct twl4030_bci *bci)
435 {
436 int ret;
437 u8 state;
438
439 ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
440 if (ret) {
441 pr_err("twl4030_bci: error reading BCIMSTATEC\n");
442 return ret;
443 }
444
445 dev_dbg(bci->dev, "state: %02x\n", state);
446
447 return state;
448 }
449
twl4030_bci_state_to_status(int state)450 static int twl4030_bci_state_to_status(int state)
451 {
452 state &= TWL4030_MSTATEC_MASK;
453 if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
454 return POWER_SUPPLY_STATUS_CHARGING;
455 else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
456 state <= TWL4030_MSTATEC_COMPLETE4)
457 return POWER_SUPPLY_STATUS_FULL;
458 else
459 return POWER_SUPPLY_STATUS_NOT_CHARGING;
460 }
461
twl4030_bci_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)462 static int twl4030_bci_get_property(struct power_supply *psy,
463 enum power_supply_property psp,
464 union power_supply_propval *val)
465 {
466 struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent);
467 int is_charging;
468 int state;
469 int ret;
470
471 state = twl4030bci_state(bci);
472 if (state < 0)
473 return state;
474
475 if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
476 is_charging = state & TWL4030_MSTATEC_USB;
477 else
478 is_charging = state & TWL4030_MSTATEC_AC;
479
480 switch (psp) {
481 case POWER_SUPPLY_PROP_STATUS:
482 if (is_charging)
483 val->intval = twl4030_bci_state_to_status(state);
484 else
485 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
486 break;
487 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
488 /* charging must be active for meaningful result */
489 if (!is_charging)
490 return -ENODATA;
491 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) {
492 ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
493 if (ret < 0)
494 return ret;
495 /* BCIVBUS uses ADCIN8, 7/1023 V/step */
496 val->intval = ret * 6843;
497 } else {
498 ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
499 if (ret < 0)
500 return ret;
501 /* BCIVAC uses ADCIN11, 10/1023 V/step */
502 val->intval = ret * 9775;
503 }
504 break;
505 case POWER_SUPPLY_PROP_CURRENT_NOW:
506 if (!is_charging)
507 return -ENODATA;
508 /* current measurement is shared between AC and USB */
509 ret = twl4030_charger_get_current();
510 if (ret < 0)
511 return ret;
512 val->intval = ret;
513 break;
514 case POWER_SUPPLY_PROP_ONLINE:
515 val->intval = is_charging &&
516 twl4030_bci_state_to_status(state) !=
517 POWER_SUPPLY_STATUS_NOT_CHARGING;
518 break;
519 default:
520 return -EINVAL;
521 }
522
523 return 0;
524 }
525
526 static enum power_supply_property twl4030_charger_props[] = {
527 POWER_SUPPLY_PROP_STATUS,
528 POWER_SUPPLY_PROP_ONLINE,
529 POWER_SUPPLY_PROP_VOLTAGE_NOW,
530 POWER_SUPPLY_PROP_CURRENT_NOW,
531 };
532
533 #ifdef CONFIG_OF
534 static const struct twl4030_bci_platform_data *
twl4030_bci_parse_dt(struct device * dev)535 twl4030_bci_parse_dt(struct device *dev)
536 {
537 struct device_node *np = dev->of_node;
538 struct twl4030_bci_platform_data *pdata;
539 u32 num;
540
541 if (!np)
542 return NULL;
543 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
544 if (!pdata)
545 return pdata;
546
547 if (of_property_read_u32(np, "ti,bb-uvolt", &num) == 0)
548 pdata->bb_uvolt = num;
549 if (of_property_read_u32(np, "ti,bb-uamp", &num) == 0)
550 pdata->bb_uamp = num;
551 return pdata;
552 }
553 #else
554 static inline const struct twl4030_bci_platform_data *
twl4030_bci_parse_dt(struct device * dev)555 twl4030_bci_parse_dt(struct device *dev)
556 {
557 return NULL;
558 }
559 #endif
560
561 static const struct power_supply_desc twl4030_bci_ac_desc = {
562 .name = "twl4030_ac",
563 .type = POWER_SUPPLY_TYPE_MAINS,
564 .properties = twl4030_charger_props,
565 .num_properties = ARRAY_SIZE(twl4030_charger_props),
566 .get_property = twl4030_bci_get_property,
567 };
568
569 static const struct power_supply_desc twl4030_bci_usb_desc = {
570 .name = "twl4030_usb",
571 .type = POWER_SUPPLY_TYPE_USB,
572 .properties = twl4030_charger_props,
573 .num_properties = ARRAY_SIZE(twl4030_charger_props),
574 .get_property = twl4030_bci_get_property,
575 };
576
twl4030_bci_probe(struct platform_device * pdev)577 static int __init twl4030_bci_probe(struct platform_device *pdev)
578 {
579 struct twl4030_bci *bci;
580 const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;
581 int ret;
582 u32 reg;
583
584 bci = kzalloc(sizeof(*bci), GFP_KERNEL);
585 if (bci == NULL)
586 return -ENOMEM;
587
588 if (!pdata)
589 pdata = twl4030_bci_parse_dt(&pdev->dev);
590
591 bci->dev = &pdev->dev;
592 bci->irq_chg = platform_get_irq(pdev, 0);
593 bci->irq_bci = platform_get_irq(pdev, 1);
594
595 /* Only proceed further *IF* battery is physically present */
596 ret = twl4030_is_battery_present(bci);
597 if (ret) {
598 dev_crit(&pdev->dev, "Battery was not detected:%d\n", ret);
599 goto fail_no_battery;
600 }
601
602 platform_set_drvdata(pdev, bci);
603
604 bci->ac = power_supply_register(&pdev->dev, &twl4030_bci_ac_desc,
605 NULL);
606 if (IS_ERR(bci->ac)) {
607 ret = PTR_ERR(bci->ac);
608 dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
609 goto fail_register_ac;
610 }
611
612 bci->usb_reg = regulator_get(bci->dev, "bci3v1");
613
614 bci->usb = power_supply_register(&pdev->dev, &twl4030_bci_usb_desc,
615 NULL);
616 if (IS_ERR(bci->usb)) {
617 ret = PTR_ERR(bci->usb);
618 dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
619 goto fail_register_usb;
620 }
621
622 ret = request_threaded_irq(bci->irq_chg, NULL,
623 twl4030_charger_interrupt, IRQF_ONESHOT, pdev->name,
624 bci);
625 if (ret < 0) {
626 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
627 bci->irq_chg, ret);
628 goto fail_chg_irq;
629 }
630
631 ret = request_threaded_irq(bci->irq_bci, NULL,
632 twl4030_bci_interrupt, IRQF_ONESHOT, pdev->name, bci);
633 if (ret < 0) {
634 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
635 bci->irq_bci, ret);
636 goto fail_bci_irq;
637 }
638
639 INIT_WORK(&bci->work, twl4030_bci_usb_work);
640
641 bci->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
642 if (!IS_ERR_OR_NULL(bci->transceiver)) {
643 bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
644 usb_register_notifier(bci->transceiver, &bci->usb_nb);
645 }
646
647 /* Enable interrupts now. */
648 reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 |
649 TWL4030_TBATOR1 | TWL4030_BATSTS);
650 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
651 TWL4030_INTERRUPTS_BCIIMR1A);
652 if (ret < 0) {
653 dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
654 goto fail_unmask_interrupts;
655 }
656
657 reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV);
658 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
659 TWL4030_INTERRUPTS_BCIIMR2A);
660 if (ret < 0)
661 dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
662
663 twl4030_charger_enable_ac(true);
664 twl4030_charger_enable_usb(bci, true);
665 if (pdata)
666 twl4030_charger_enable_backup(pdata->bb_uvolt,
667 pdata->bb_uamp);
668 else
669 twl4030_charger_enable_backup(0, 0);
670
671 return 0;
672
673 fail_unmask_interrupts:
674 if (!IS_ERR_OR_NULL(bci->transceiver)) {
675 usb_unregister_notifier(bci->transceiver, &bci->usb_nb);
676 usb_put_phy(bci->transceiver);
677 }
678 free_irq(bci->irq_bci, bci);
679 fail_bci_irq:
680 free_irq(bci->irq_chg, bci);
681 fail_chg_irq:
682 power_supply_unregister(bci->usb);
683 fail_register_usb:
684 power_supply_unregister(bci->ac);
685 fail_register_ac:
686 fail_no_battery:
687 kfree(bci);
688
689 return ret;
690 }
691
twl4030_bci_remove(struct platform_device * pdev)692 static int __exit twl4030_bci_remove(struct platform_device *pdev)
693 {
694 struct twl4030_bci *bci = platform_get_drvdata(pdev);
695
696 twl4030_charger_enable_ac(false);
697 twl4030_charger_enable_usb(bci, false);
698 twl4030_charger_enable_backup(0, 0);
699
700 /* mask interrupts */
701 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
702 TWL4030_INTERRUPTS_BCIIMR1A);
703 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
704 TWL4030_INTERRUPTS_BCIIMR2A);
705
706 if (!IS_ERR_OR_NULL(bci->transceiver)) {
707 usb_unregister_notifier(bci->transceiver, &bci->usb_nb);
708 usb_put_phy(bci->transceiver);
709 }
710 free_irq(bci->irq_bci, bci);
711 free_irq(bci->irq_chg, bci);
712 power_supply_unregister(bci->usb);
713 power_supply_unregister(bci->ac);
714 kfree(bci);
715
716 return 0;
717 }
718
719 static const struct of_device_id twl_bci_of_match[] = {
720 {.compatible = "ti,twl4030-bci", },
721 { }
722 };
723 MODULE_DEVICE_TABLE(of, twl_bci_of_match);
724
725 static struct platform_driver twl4030_bci_driver = {
726 .driver = {
727 .name = "twl4030_bci",
728 .of_match_table = of_match_ptr(twl_bci_of_match),
729 },
730 .remove = __exit_p(twl4030_bci_remove),
731 };
732
733 module_platform_driver_probe(twl4030_bci_driver, twl4030_bci_probe);
734
735 MODULE_AUTHOR("Gražvydas Ignotas");
736 MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
737 MODULE_LICENSE("GPL");
738 MODULE_ALIAS("platform:twl4030_bci");
739