1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * TWL4030/TPS65950 BCI (Battery Charger Interface) driver
4 *
5 * Copyright (C) 2010 Gražvydas Ignotas <notasas@gmail.com>
6 *
7 * based on twl4030_bci_battery.c by TI
8 * Copyright (C) 2008 Texas Instruments, Inc.
9 */
10
11 #include <linux/init.h>
12 #include <linux/module.h>
13 #include <linux/slab.h>
14 #include <linux/err.h>
15 #include <linux/of.h>
16 #include <linux/platform_device.h>
17 #include <linux/interrupt.h>
18 #include <linux/mfd/twl.h>
19 #include <linux/power_supply.h>
20 #include <linux/notifier.h>
21 #include <linux/usb/otg.h>
22 #include <linux/iio/consumer.h>
23
24 #define TWL4030_BCIMDEN 0x00
25 #define TWL4030_BCIMDKEY 0x01
26 #define TWL4030_BCIMSTATEC 0x02
27 #define TWL4030_BCIICHG 0x08
28 #define TWL4030_BCIVAC 0x0a
29 #define TWL4030_BCIVBUS 0x0c
30 #define TWL4030_BCIMFSTS3 0x0F
31 #define TWL4030_BCIMFSTS4 0x10
32 #define TWL4030_BCICTL1 0x23
33 #define TWL4030_BB_CFG 0x12
34 #define TWL4030_BCIIREF1 0x27
35 #define TWL4030_BCIIREF2 0x28
36 #define TWL4030_BCIMFKEY 0x11
37 #define TWL4030_BCIMFEN3 0x14
38 #define TWL4030_BCIMFTH8 0x1d
39 #define TWL4030_BCIMFTH9 0x1e
40 #define TWL4030_BCIWDKEY 0x21
41
42 #define TWL4030_BCIMFSTS1 0x01
43
44 #define TWL4030_BCIAUTOWEN BIT(5)
45 #define TWL4030_CONFIG_DONE BIT(4)
46 #define TWL4030_CVENAC BIT(2)
47 #define TWL4030_BCIAUTOUSB BIT(1)
48 #define TWL4030_BCIAUTOAC BIT(0)
49 #define TWL4030_CGAIN BIT(5)
50 #define TWL4030_USBFASTMCHG BIT(2)
51 #define TWL4030_STS_VBUS BIT(7)
52 #define TWL4030_STS_USB_ID BIT(2)
53 #define TWL4030_BBCHEN BIT(4)
54 #define TWL4030_BBSEL_MASK 0x0c
55 #define TWL4030_BBSEL_2V5 0x00
56 #define TWL4030_BBSEL_3V0 0x04
57 #define TWL4030_BBSEL_3V1 0x08
58 #define TWL4030_BBSEL_3V2 0x0c
59 #define TWL4030_BBISEL_MASK 0x03
60 #define TWL4030_BBISEL_25uA 0x00
61 #define TWL4030_BBISEL_150uA 0x01
62 #define TWL4030_BBISEL_500uA 0x02
63 #define TWL4030_BBISEL_1000uA 0x03
64
65 #define TWL4030_BATSTSPCHG BIT(2)
66 #define TWL4030_BATSTSMCHG BIT(6)
67
68 /* BCI interrupts */
69 #define TWL4030_WOVF BIT(0) /* Watchdog overflow */
70 #define TWL4030_TMOVF BIT(1) /* Timer overflow */
71 #define TWL4030_ICHGHIGH BIT(2) /* Battery charge current high */
72 #define TWL4030_ICHGLOW BIT(3) /* Battery cc. low / FSM state change */
73 #define TWL4030_ICHGEOC BIT(4) /* Battery current end-of-charge */
74 #define TWL4030_TBATOR2 BIT(5) /* Battery temperature out of range 2 */
75 #define TWL4030_TBATOR1 BIT(6) /* Battery temperature out of range 1 */
76 #define TWL4030_BATSTS BIT(7) /* Battery status */
77
78 #define TWL4030_VBATLVL BIT(0) /* VBAT level */
79 #define TWL4030_VBATOV BIT(1) /* VBAT overvoltage */
80 #define TWL4030_VBUSOV BIT(2) /* VBUS overvoltage */
81 #define TWL4030_ACCHGOV BIT(3) /* Ac charger overvoltage */
82
83 #define TWL4030_MSTATEC_USB BIT(4)
84 #define TWL4030_MSTATEC_AC BIT(5)
85 #define TWL4030_MSTATEC_MASK 0x0f
86 #define TWL4030_MSTATEC_QUICK1 0x02
87 #define TWL4030_MSTATEC_QUICK7 0x07
88 #define TWL4030_MSTATEC_COMPLETE1 0x0b
89 #define TWL4030_MSTATEC_COMPLETE4 0x0e
90
91 /*
92 * If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11)
93 * then AC is available.
94 */
ac_available(struct iio_channel * channel_vac)95 static inline int ac_available(struct iio_channel *channel_vac)
96 {
97 int val, err;
98
99 if (!channel_vac)
100 return 0;
101
102 err = iio_read_channel_processed(channel_vac, &val);
103 if (err < 0)
104 return 0;
105 return val > 4500;
106 }
107
108 static bool allow_usb;
109 module_param(allow_usb, bool, 0644);
110 MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");
111
112 struct twl4030_bci {
113 struct device *dev;
114 struct power_supply *ac;
115 struct power_supply *usb;
116 struct usb_phy *transceiver;
117 struct notifier_block usb_nb;
118 struct work_struct work;
119 int irq_chg;
120 int irq_bci;
121 int usb_enabled;
122
123 /*
124 * ichg_* and *_cur values in uA. If any are 'large', we set
125 * CGAIN to '1' which doubles the range for half the
126 * precision.
127 */
128 unsigned int ichg_eoc, ichg_lo, ichg_hi;
129 unsigned int usb_cur, ac_cur;
130 struct iio_channel *channel_vac;
131 bool ac_is_active;
132 int usb_mode, ac_mode; /* charging mode requested */
133 #define CHARGE_OFF 0
134 #define CHARGE_AUTO 1
135 #define CHARGE_LINEAR 2
136
137 /* When setting the USB current we slowly increase the
138 * requested current until target is reached or the voltage
139 * drops below 4.75V. In the latter case we step back one
140 * step.
141 */
142 unsigned int usb_cur_target;
143 struct delayed_work current_worker;
144 #define USB_CUR_STEP 20000 /* 20mA at a time */
145 #define USB_MIN_VOLT 4750000 /* 4.75V */
146 #define USB_CUR_DELAY msecs_to_jiffies(100)
147 #define USB_MAX_CURRENT 1700000 /* TWL4030 caps at 1.7A */
148
149 unsigned long event;
150 };
151
152 /* strings for 'usb_mode' values */
153 static const char *modes[] = { "off", "auto", "continuous" };
154
155 /*
156 * clear and set bits on an given register on a given module
157 */
twl4030_clear_set(u8 mod_no,u8 clear,u8 set,u8 reg)158 static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg)
159 {
160 u8 val = 0;
161 int ret;
162
163 ret = twl_i2c_read_u8(mod_no, &val, reg);
164 if (ret)
165 return ret;
166
167 val &= ~clear;
168 val |= set;
169
170 return twl_i2c_write_u8(mod_no, val, reg);
171 }
172
twl4030_bci_read(u8 reg,u8 * val)173 static int twl4030_bci_read(u8 reg, u8 *val)
174 {
175 return twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, val, reg);
176 }
177
twl4030_clear_set_boot_bci(u8 clear,u8 set)178 static int twl4030_clear_set_boot_bci(u8 clear, u8 set)
179 {
180 return twl4030_clear_set(TWL_MODULE_PM_MASTER, clear,
181 TWL4030_CONFIG_DONE | TWL4030_BCIAUTOWEN | set,
182 TWL4030_PM_MASTER_BOOT_BCI);
183 }
184
twl4030bci_read_adc_val(u8 reg)185 static int twl4030bci_read_adc_val(u8 reg)
186 {
187 int ret, temp;
188 u8 val;
189
190 /* read MSB */
191 ret = twl4030_bci_read(reg + 1, &val);
192 if (ret)
193 return ret;
194
195 temp = (int)(val & 0x03) << 8;
196
197 /* read LSB */
198 ret = twl4030_bci_read(reg, &val);
199 if (ret)
200 return ret;
201
202 return temp | val;
203 }
204
205 /*
206 * TI provided formulas:
207 * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85
208 * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7
209 * Here we use integer approximation of:
210 * CGAIN == 0: val * 1.6618 - 0.85 * 1000
211 * CGAIN == 1: (val * 1.6618 - 0.85 * 1000) * 2
212 */
213 /*
214 * convert twl register value for currents into uA
215 */
regval2ua(int regval,bool cgain)216 static int regval2ua(int regval, bool cgain)
217 {
218 if (cgain)
219 return (regval * 16618 - 8500 * 1000) / 5;
220 else
221 return (regval * 16618 - 8500 * 1000) / 10;
222 }
223
224 /*
225 * convert uA currents into twl register value
226 */
ua2regval(int ua,bool cgain)227 static int ua2regval(int ua, bool cgain)
228 {
229 int ret;
230 if (cgain)
231 ua /= 2;
232 ret = (ua * 10 + 8500 * 1000) / 16618;
233 /* rounding problems */
234 if (ret < 512)
235 ret = 512;
236 return ret;
237 }
238
twl4030_charger_update_current(struct twl4030_bci * bci)239 static int twl4030_charger_update_current(struct twl4030_bci *bci)
240 {
241 int status;
242 int cur;
243 unsigned reg, cur_reg;
244 u8 bcictl1, oldreg, fullreg;
245 bool cgain = false;
246 u8 boot_bci;
247
248 /*
249 * If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11)
250 * and AC is enabled, set current for 'ac'
251 */
252 if (ac_available(bci->channel_vac)) {
253 cur = bci->ac_cur;
254 bci->ac_is_active = true;
255 } else {
256 cur = bci->usb_cur;
257 bci->ac_is_active = false;
258 if (cur > bci->usb_cur_target) {
259 cur = bci->usb_cur_target;
260 bci->usb_cur = cur;
261 }
262 if (cur < bci->usb_cur_target)
263 schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY);
264 }
265
266 /* First, check thresholds and see if cgain is needed */
267 if (bci->ichg_eoc >= 200000)
268 cgain = true;
269 if (bci->ichg_lo >= 400000)
270 cgain = true;
271 if (bci->ichg_hi >= 820000)
272 cgain = true;
273 if (cur > 852000)
274 cgain = true;
275
276 status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
277 if (status < 0)
278 return status;
279 if (twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &boot_bci,
280 TWL4030_PM_MASTER_BOOT_BCI) < 0)
281 boot_bci = 0;
282 boot_bci &= 7;
283
284 if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN))
285 /* Need to turn for charging while we change the
286 * CGAIN bit. Leave it off while everything is
287 * updated.
288 */
289 twl4030_clear_set_boot_bci(boot_bci, 0);
290
291 /*
292 * For ichg_eoc, the hardware only supports reg values matching
293 * 100XXXX000, and requires the XXXX be stored in the high nibble
294 * of TWL4030_BCIMFTH8.
295 */
296 reg = ua2regval(bci->ichg_eoc, cgain);
297 if (reg > 0x278)
298 reg = 0x278;
299 if (reg < 0x200)
300 reg = 0x200;
301 reg = (reg >> 3) & 0xf;
302 fullreg = reg << 4;
303
304 /*
305 * For ichg_lo, reg value must match 10XXXX0000.
306 * XXXX is stored in low nibble of TWL4030_BCIMFTH8.
307 */
308 reg = ua2regval(bci->ichg_lo, cgain);
309 if (reg > 0x2F0)
310 reg = 0x2F0;
311 if (reg < 0x200)
312 reg = 0x200;
313 reg = (reg >> 4) & 0xf;
314 fullreg |= reg;
315
316 /* ichg_eoc and ichg_lo live in same register */
317 status = twl4030_bci_read(TWL4030_BCIMFTH8, &oldreg);
318 if (status < 0)
319 return status;
320 if (oldreg != fullreg) {
321 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xF4,
322 TWL4030_BCIMFKEY);
323 if (status < 0)
324 return status;
325 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
326 fullreg, TWL4030_BCIMFTH8);
327 }
328
329 /* ichg_hi threshold must be 1XXXX01100 (I think) */
330 reg = ua2regval(bci->ichg_hi, cgain);
331 if (reg > 0x3E0)
332 reg = 0x3E0;
333 if (reg < 0x200)
334 reg = 0x200;
335 fullreg = (reg >> 5) & 0xF;
336 fullreg <<= 4;
337 status = twl4030_bci_read(TWL4030_BCIMFTH9, &oldreg);
338 if (status < 0)
339 return status;
340 if ((oldreg & 0xF0) != fullreg) {
341 fullreg |= (oldreg & 0x0F);
342 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
343 TWL4030_BCIMFKEY);
344 if (status < 0)
345 return status;
346 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
347 fullreg, TWL4030_BCIMFTH9);
348 }
349
350 /*
351 * And finally, set the current. This is stored in
352 * two registers.
353 */
354 reg = ua2regval(cur, cgain);
355 /* we have only 10 bits */
356 if (reg > 0x3ff)
357 reg = 0x3ff;
358 status = twl4030_bci_read(TWL4030_BCIIREF1, &oldreg);
359 if (status < 0)
360 return status;
361 cur_reg = oldreg;
362 status = twl4030_bci_read(TWL4030_BCIIREF2, &oldreg);
363 if (status < 0)
364 return status;
365 cur_reg |= oldreg << 8;
366 if (reg != cur_reg) {
367 /* disable write protection for one write access for
368 * BCIIREF */
369 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
370 TWL4030_BCIMFKEY);
371 if (status < 0)
372 return status;
373 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
374 (reg & 0x100) ? 3 : 2,
375 TWL4030_BCIIREF2);
376 if (status < 0)
377 return status;
378 /* disable write protection for one write access for
379 * BCIIREF */
380 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
381 TWL4030_BCIMFKEY);
382 if (status < 0)
383 return status;
384 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
385 reg & 0xff,
386 TWL4030_BCIIREF1);
387 }
388 if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN)) {
389 /* Flip CGAIN and re-enable charging */
390 bcictl1 ^= TWL4030_CGAIN;
391 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
392 bcictl1, TWL4030_BCICTL1);
393 twl4030_clear_set_boot_bci(0, boot_bci);
394 }
395 return 0;
396 }
397
398 static int twl4030_charger_get_current(void);
399
twl4030_current_worker(struct work_struct * data)400 static void twl4030_current_worker(struct work_struct *data)
401 {
402 int v, curr;
403 int res;
404 struct twl4030_bci *bci = container_of(data, struct twl4030_bci,
405 current_worker.work);
406
407 res = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
408 if (res < 0)
409 v = 0;
410 else
411 /* BCIVBUS uses ADCIN8, 7/1023 V/step */
412 v = res * 6843;
413 curr = twl4030_charger_get_current();
414
415 dev_dbg(bci->dev, "v=%d cur=%d limit=%d target=%d\n", v, curr,
416 bci->usb_cur, bci->usb_cur_target);
417
418 if (v < USB_MIN_VOLT) {
419 /* Back up and stop adjusting. */
420 if (bci->usb_cur >= USB_CUR_STEP)
421 bci->usb_cur -= USB_CUR_STEP;
422 bci->usb_cur_target = bci->usb_cur;
423 } else if (bci->usb_cur >= bci->usb_cur_target ||
424 bci->usb_cur + USB_CUR_STEP > USB_MAX_CURRENT) {
425 /* Reached target and voltage is OK - stop */
426 return;
427 } else {
428 bci->usb_cur += USB_CUR_STEP;
429 schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY);
430 }
431 twl4030_charger_update_current(bci);
432 }
433
434 /*
435 * Enable/Disable USB Charge functionality.
436 */
twl4030_charger_enable_usb(struct twl4030_bci * bci,bool enable)437 static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
438 {
439 int ret;
440 u32 reg;
441
442 if (bci->usb_mode == CHARGE_OFF)
443 enable = false;
444 if (enable && !IS_ERR_OR_NULL(bci->transceiver)) {
445
446 twl4030_charger_update_current(bci);
447
448 /* Need to keep phy powered */
449 if (!bci->usb_enabled) {
450 pm_runtime_get_sync(bci->transceiver->dev);
451 bci->usb_enabled = 1;
452 }
453
454 if (bci->usb_mode == CHARGE_AUTO) {
455 /* Enable interrupts now. */
456 reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC |
457 TWL4030_TBATOR2 | TWL4030_TBATOR1 |
458 TWL4030_BATSTS);
459 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
460 TWL4030_INTERRUPTS_BCIIMR1A);
461 if (ret < 0) {
462 dev_err(bci->dev,
463 "failed to unmask interrupts: %d\n",
464 ret);
465 return ret;
466 }
467 /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
468 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
469 }
470
471 /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
472 ret = twl4030_clear_set(TWL_MODULE_MAIN_CHARGE, 0,
473 TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
474 if (bci->usb_mode == CHARGE_LINEAR) {
475 /* Enable interrupts now. */
476 reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_TBATOR2 |
477 TWL4030_TBATOR1 | TWL4030_BATSTS);
478 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
479 TWL4030_INTERRUPTS_BCIIMR1A);
480 if (ret < 0) {
481 dev_err(bci->dev,
482 "failed to unmask interrupts: %d\n",
483 ret);
484 return ret;
485 }
486 twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC|TWL4030_CVENAC, 0);
487 /* Watch dog key: WOVF acknowledge */
488 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x33,
489 TWL4030_BCIWDKEY);
490 /* 0x24 + EKEY6: off mode */
491 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a,
492 TWL4030_BCIMDKEY);
493 /* EKEY2: Linear charge: USB path */
494 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x26,
495 TWL4030_BCIMDKEY);
496 /* WDKEY5: stop watchdog count */
497 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf3,
498 TWL4030_BCIWDKEY);
499 /* enable MFEN3 access */
500 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x9c,
501 TWL4030_BCIMFKEY);
502 /* ICHGEOCEN - end-of-charge monitor (current < 80mA)
503 * (charging continues)
504 * ICHGLOWEN - current level monitor (charge continues)
505 * don't monitor over-current or heat save
506 */
507 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf0,
508 TWL4030_BCIMFEN3);
509 }
510 } else {
511 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
512 ret |= twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a,
513 TWL4030_BCIMDKEY);
514 if (bci->usb_enabled) {
515 pm_runtime_mark_last_busy(bci->transceiver->dev);
516 pm_runtime_put_autosuspend(bci->transceiver->dev);
517 bci->usb_enabled = 0;
518 }
519 bci->usb_cur = 0;
520 }
521
522 return ret;
523 }
524
525 /*
526 * Enable/Disable AC Charge funtionality.
527 */
twl4030_charger_enable_ac(struct twl4030_bci * bci,bool enable)528 static int twl4030_charger_enable_ac(struct twl4030_bci *bci, bool enable)
529 {
530 int ret;
531
532 if (bci->ac_mode == CHARGE_OFF)
533 enable = false;
534
535 if (enable)
536 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
537 else
538 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
539
540 return ret;
541 }
542
543 /*
544 * Enable/Disable charging of Backup Battery.
545 */
twl4030_charger_enable_backup(int uvolt,int uamp)546 static int twl4030_charger_enable_backup(int uvolt, int uamp)
547 {
548 int ret;
549 u8 flags;
550
551 if (uvolt < 2500000 ||
552 uamp < 25) {
553 /* disable charging of backup battery */
554 ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
555 TWL4030_BBCHEN, 0, TWL4030_BB_CFG);
556 return ret;
557 }
558
559 flags = TWL4030_BBCHEN;
560 if (uvolt >= 3200000)
561 flags |= TWL4030_BBSEL_3V2;
562 else if (uvolt >= 3100000)
563 flags |= TWL4030_BBSEL_3V1;
564 else if (uvolt >= 3000000)
565 flags |= TWL4030_BBSEL_3V0;
566 else
567 flags |= TWL4030_BBSEL_2V5;
568
569 if (uamp >= 1000)
570 flags |= TWL4030_BBISEL_1000uA;
571 else if (uamp >= 500)
572 flags |= TWL4030_BBISEL_500uA;
573 else if (uamp >= 150)
574 flags |= TWL4030_BBISEL_150uA;
575 else
576 flags |= TWL4030_BBISEL_25uA;
577
578 ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
579 TWL4030_BBSEL_MASK | TWL4030_BBISEL_MASK,
580 flags,
581 TWL4030_BB_CFG);
582
583 return ret;
584 }
585
586 /*
587 * TWL4030 CHG_PRES (AC charger presence) events
588 */
twl4030_charger_interrupt(int irq,void * arg)589 static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
590 {
591 struct twl4030_bci *bci = arg;
592
593 dev_dbg(bci->dev, "CHG_PRES irq\n");
594 /* reset current on each 'plug' event */
595 bci->ac_cur = 500000;
596 twl4030_charger_update_current(bci);
597 power_supply_changed(bci->ac);
598 power_supply_changed(bci->usb);
599
600 return IRQ_HANDLED;
601 }
602
603 /*
604 * TWL4030 BCI monitoring events
605 */
twl4030_bci_interrupt(int irq,void * arg)606 static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
607 {
608 struct twl4030_bci *bci = arg;
609 u8 irqs1, irqs2;
610 int ret;
611
612 ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
613 TWL4030_INTERRUPTS_BCIISR1A);
614 if (ret < 0)
615 return IRQ_HANDLED;
616
617 ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
618 TWL4030_INTERRUPTS_BCIISR2A);
619 if (ret < 0)
620 return IRQ_HANDLED;
621
622 dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);
623
624 if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) {
625 /* charger state change, inform the core */
626 power_supply_changed(bci->ac);
627 power_supply_changed(bci->usb);
628 }
629 twl4030_charger_update_current(bci);
630
631 /* various monitoring events, for now we just log them here */
632 if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1))
633 dev_warn(bci->dev, "battery temperature out of range\n");
634
635 if (irqs1 & TWL4030_BATSTS)
636 dev_crit(bci->dev, "battery disconnected\n");
637
638 if (irqs2 & TWL4030_VBATOV)
639 dev_crit(bci->dev, "VBAT overvoltage\n");
640
641 if (irqs2 & TWL4030_VBUSOV)
642 dev_crit(bci->dev, "VBUS overvoltage\n");
643
644 if (irqs2 & TWL4030_ACCHGOV)
645 dev_crit(bci->dev, "Ac charger overvoltage\n");
646
647 return IRQ_HANDLED;
648 }
649
twl4030_bci_usb_work(struct work_struct * data)650 static void twl4030_bci_usb_work(struct work_struct *data)
651 {
652 struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
653
654 switch (bci->event) {
655 case USB_EVENT_VBUS:
656 case USB_EVENT_CHARGER:
657 twl4030_charger_enable_usb(bci, true);
658 break;
659 case USB_EVENT_NONE:
660 twl4030_charger_enable_usb(bci, false);
661 break;
662 }
663 }
664
twl4030_bci_usb_ncb(struct notifier_block * nb,unsigned long val,void * priv)665 static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
666 void *priv)
667 {
668 struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb);
669
670 dev_dbg(bci->dev, "OTG notify %lu\n", val);
671
672 /* reset current on each 'plug' event */
673 if (allow_usb)
674 bci->usb_cur_target = 500000;
675 else
676 bci->usb_cur_target = 100000;
677
678 bci->event = val;
679 schedule_work(&bci->work);
680
681 return NOTIFY_OK;
682 }
683
684 /*
685 * sysfs charger enabled store
686 */
687 static ssize_t
twl4030_bci_mode_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t n)688 twl4030_bci_mode_store(struct device *dev, struct device_attribute *attr,
689 const char *buf, size_t n)
690 {
691 struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
692 int mode;
693 int status;
694
695 mode = sysfs_match_string(modes, buf);
696 if (mode < 0)
697 return mode;
698
699 if (dev == &bci->ac->dev) {
700 if (mode == 2)
701 return -EINVAL;
702 twl4030_charger_enable_ac(bci, false);
703 bci->ac_mode = mode;
704 status = twl4030_charger_enable_ac(bci, true);
705 } else {
706 twl4030_charger_enable_usb(bci, false);
707 bci->usb_mode = mode;
708 status = twl4030_charger_enable_usb(bci, true);
709 }
710 return (status == 0) ? n : status;
711 }
712
713 /*
714 * sysfs charger enabled show
715 */
716 static ssize_t
twl4030_bci_mode_show(struct device * dev,struct device_attribute * attr,char * buf)717 twl4030_bci_mode_show(struct device *dev,
718 struct device_attribute *attr, char *buf)
719 {
720 struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
721 int len = 0;
722 int i;
723 int mode = bci->usb_mode;
724
725 if (dev == &bci->ac->dev)
726 mode = bci->ac_mode;
727
728 for (i = 0; i < ARRAY_SIZE(modes); i++)
729 if (mode == i)
730 len += sysfs_emit_at(buf, len, "[%s] ", modes[i]);
731 else
732 len += sysfs_emit_at(buf, len, "%s ", modes[i]);
733 buf[len-1] = '\n';
734 return len;
735 }
736 static DEVICE_ATTR(mode, 0644, twl4030_bci_mode_show,
737 twl4030_bci_mode_store);
738
twl4030_charger_get_current(void)739 static int twl4030_charger_get_current(void)
740 {
741 int curr;
742 int ret;
743 u8 bcictl1;
744
745 curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
746 if (curr < 0)
747 return curr;
748
749 ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
750 if (ret)
751 return ret;
752
753 return regval2ua(curr, bcictl1 & TWL4030_CGAIN);
754 }
755
756 /*
757 * Returns the main charge FSM state
758 * Or < 0 on failure.
759 */
twl4030bci_state(struct twl4030_bci * bci)760 static int twl4030bci_state(struct twl4030_bci *bci)
761 {
762 int ret;
763 u8 state;
764
765 ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
766 if (ret) {
767 dev_err(bci->dev, "error reading BCIMSTATEC\n");
768 return ret;
769 }
770
771 dev_dbg(bci->dev, "state: %02x\n", state);
772
773 return state;
774 }
775
twl4030_bci_state_to_status(int state)776 static int twl4030_bci_state_to_status(int state)
777 {
778 state &= TWL4030_MSTATEC_MASK;
779 if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
780 return POWER_SUPPLY_STATUS_CHARGING;
781 else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
782 state <= TWL4030_MSTATEC_COMPLETE4)
783 return POWER_SUPPLY_STATUS_FULL;
784 else
785 return POWER_SUPPLY_STATUS_NOT_CHARGING;
786 }
787
twl4030_bci_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)788 static int twl4030_bci_get_property(struct power_supply *psy,
789 enum power_supply_property psp,
790 union power_supply_propval *val)
791 {
792 struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent);
793 int is_charging;
794 int state;
795 int ret;
796
797 state = twl4030bci_state(bci);
798 if (state < 0)
799 return state;
800
801 if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
802 is_charging = state & TWL4030_MSTATEC_USB;
803 else
804 is_charging = state & TWL4030_MSTATEC_AC;
805 if (!is_charging) {
806 u8 s;
807 ret = twl4030_bci_read(TWL4030_BCIMDEN, &s);
808 if (ret < 0)
809 return ret;
810 if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
811 is_charging = s & 1;
812 else
813 is_charging = s & 2;
814 if (is_charging)
815 /* A little white lie */
816 state = TWL4030_MSTATEC_QUICK1;
817 }
818
819 switch (psp) {
820 case POWER_SUPPLY_PROP_STATUS:
821 if (is_charging)
822 val->intval = twl4030_bci_state_to_status(state);
823 else
824 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
825 break;
826 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
827 /* charging must be active for meaningful result */
828 if (!is_charging)
829 return -ENODATA;
830 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) {
831 ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
832 if (ret < 0)
833 return ret;
834 /* BCIVBUS uses ADCIN8, 7/1023 V/step */
835 val->intval = ret * 6843;
836 } else {
837 ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
838 if (ret < 0)
839 return ret;
840 /* BCIVAC uses ADCIN11, 10/1023 V/step */
841 val->intval = ret * 9775;
842 }
843 break;
844 case POWER_SUPPLY_PROP_CURRENT_NOW:
845 if (!is_charging)
846 return -ENODATA;
847 /* current measurement is shared between AC and USB */
848 ret = twl4030_charger_get_current();
849 if (ret < 0)
850 return ret;
851 val->intval = ret;
852 break;
853 case POWER_SUPPLY_PROP_ONLINE:
854 val->intval = is_charging &&
855 twl4030_bci_state_to_status(state) !=
856 POWER_SUPPLY_STATUS_NOT_CHARGING;
857 break;
858 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
859 val->intval = -1;
860 if (psy->desc->type != POWER_SUPPLY_TYPE_USB) {
861 if (!bci->ac_is_active)
862 val->intval = bci->ac_cur;
863 } else {
864 if (bci->ac_is_active)
865 val->intval = bci->usb_cur_target;
866 }
867 if (val->intval < 0) {
868 u8 bcictl1;
869
870 val->intval = twl4030bci_read_adc_val(TWL4030_BCIIREF1);
871 if (val->intval < 0)
872 return val->intval;
873 ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
874 if (ret < 0)
875 return ret;
876 val->intval = regval2ua(val->intval, bcictl1 &
877 TWL4030_CGAIN);
878 }
879 break;
880 default:
881 return -EINVAL;
882 }
883
884 return 0;
885 }
886
twl4030_bci_set_property(struct power_supply * psy,enum power_supply_property psp,const union power_supply_propval * val)887 static int twl4030_bci_set_property(struct power_supply *psy,
888 enum power_supply_property psp,
889 const union power_supply_propval *val)
890 {
891 struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent);
892
893 switch (psp) {
894 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
895 if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
896 bci->usb_cur_target = val->intval;
897 else
898 bci->ac_cur = val->intval;
899 twl4030_charger_update_current(bci);
900 break;
901 default:
902 return -EINVAL;
903 }
904
905 return 0;
906 }
907
twl4030_bci_property_is_writeable(struct power_supply * psy,enum power_supply_property psp)908 static int twl4030_bci_property_is_writeable(struct power_supply *psy,
909 enum power_supply_property psp)
910 {
911 switch (psp) {
912 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
913 return true;
914 default:
915 return false;
916 }
917 }
918
919 static enum power_supply_property twl4030_charger_props[] = {
920 POWER_SUPPLY_PROP_STATUS,
921 POWER_SUPPLY_PROP_ONLINE,
922 POWER_SUPPLY_PROP_VOLTAGE_NOW,
923 POWER_SUPPLY_PROP_CURRENT_NOW,
924 POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
925 };
926
927 #ifdef CONFIG_OF
928 static const struct twl4030_bci_platform_data *
twl4030_bci_parse_dt(struct device * dev)929 twl4030_bci_parse_dt(struct device *dev)
930 {
931 struct device_node *np = dev->of_node;
932 struct twl4030_bci_platform_data *pdata;
933 u32 num;
934
935 if (!np)
936 return NULL;
937 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
938 if (!pdata)
939 return pdata;
940
941 if (of_property_read_u32(np, "ti,bb-uvolt", &num) == 0)
942 pdata->bb_uvolt = num;
943 if (of_property_read_u32(np, "ti,bb-uamp", &num) == 0)
944 pdata->bb_uamp = num;
945 return pdata;
946 }
947 #else
948 static inline const struct twl4030_bci_platform_data *
twl4030_bci_parse_dt(struct device * dev)949 twl4030_bci_parse_dt(struct device *dev)
950 {
951 return NULL;
952 }
953 #endif
954
955 static const struct power_supply_desc twl4030_bci_ac_desc = {
956 .name = "twl4030_ac",
957 .type = POWER_SUPPLY_TYPE_MAINS,
958 .properties = twl4030_charger_props,
959 .num_properties = ARRAY_SIZE(twl4030_charger_props),
960 .get_property = twl4030_bci_get_property,
961 .set_property = twl4030_bci_set_property,
962 .property_is_writeable = twl4030_bci_property_is_writeable,
963 };
964
965 static const struct power_supply_desc twl4030_bci_usb_desc = {
966 .name = "twl4030_usb",
967 .type = POWER_SUPPLY_TYPE_USB,
968 .properties = twl4030_charger_props,
969 .num_properties = ARRAY_SIZE(twl4030_charger_props),
970 .get_property = twl4030_bci_get_property,
971 .set_property = twl4030_bci_set_property,
972 .property_is_writeable = twl4030_bci_property_is_writeable,
973 };
974
twl4030_bci_probe(struct platform_device * pdev)975 static int twl4030_bci_probe(struct platform_device *pdev)
976 {
977 struct twl4030_bci *bci;
978 const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;
979 int ret;
980 u32 reg;
981
982 bci = devm_kzalloc(&pdev->dev, sizeof(*bci), GFP_KERNEL);
983 if (bci == NULL)
984 return -ENOMEM;
985
986 if (!pdata)
987 pdata = twl4030_bci_parse_dt(&pdev->dev);
988
989 bci->ichg_eoc = 80100; /* Stop charging when current drops to here */
990 bci->ichg_lo = 241000; /* Low threshold */
991 bci->ichg_hi = 500000; /* High threshold */
992 bci->ac_cur = 500000; /* 500mA */
993 if (allow_usb)
994 bci->usb_cur_target = 500000; /* 500mA */
995 else
996 bci->usb_cur_target = 100000; /* 100mA */
997 bci->usb_mode = CHARGE_AUTO;
998 bci->ac_mode = CHARGE_AUTO;
999
1000 bci->dev = &pdev->dev;
1001 bci->irq_chg = platform_get_irq(pdev, 0);
1002 bci->irq_bci = platform_get_irq(pdev, 1);
1003
1004 platform_set_drvdata(pdev, bci);
1005
1006 INIT_WORK(&bci->work, twl4030_bci_usb_work);
1007 INIT_DELAYED_WORK(&bci->current_worker, twl4030_current_worker);
1008
1009 bci->channel_vac = devm_iio_channel_get(&pdev->dev, "vac");
1010 if (IS_ERR(bci->channel_vac)) {
1011 ret = PTR_ERR(bci->channel_vac);
1012 if (ret == -EPROBE_DEFER)
1013 return ret; /* iio not ready */
1014 dev_warn(&pdev->dev, "could not request vac iio channel (%d)",
1015 ret);
1016 bci->channel_vac = NULL;
1017 }
1018
1019 if (bci->dev->of_node) {
1020 struct device_node *phynode;
1021
1022 phynode = of_get_compatible_child(bci->dev->of_node->parent,
1023 "ti,twl4030-usb");
1024 if (phynode) {
1025 bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
1026 bci->transceiver = devm_usb_get_phy_by_node(
1027 bci->dev, phynode, &bci->usb_nb);
1028 of_node_put(phynode);
1029 if (IS_ERR(bci->transceiver)) {
1030 ret = PTR_ERR(bci->transceiver);
1031 if (ret == -EPROBE_DEFER)
1032 return ret; /* phy not ready */
1033 dev_warn(&pdev->dev, "could not request transceiver (%d)",
1034 ret);
1035 bci->transceiver = NULL;
1036 }
1037 }
1038 }
1039
1040 bci->ac = devm_power_supply_register(&pdev->dev, &twl4030_bci_ac_desc,
1041 NULL);
1042 if (IS_ERR(bci->ac)) {
1043 ret = PTR_ERR(bci->ac);
1044 dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
1045 return ret;
1046 }
1047
1048 bci->usb = devm_power_supply_register(&pdev->dev, &twl4030_bci_usb_desc,
1049 NULL);
1050 if (IS_ERR(bci->usb)) {
1051 ret = PTR_ERR(bci->usb);
1052 dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
1053 return ret;
1054 }
1055
1056 ret = devm_request_threaded_irq(&pdev->dev, bci->irq_chg, NULL,
1057 twl4030_charger_interrupt, IRQF_ONESHOT, pdev->name,
1058 bci);
1059 if (ret < 0) {
1060 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
1061 bci->irq_chg, ret);
1062 return ret;
1063 }
1064
1065 ret = devm_request_threaded_irq(&pdev->dev, bci->irq_bci, NULL,
1066 twl4030_bci_interrupt, IRQF_ONESHOT, pdev->name, bci);
1067 if (ret < 0) {
1068 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
1069 bci->irq_bci, ret);
1070 return ret;
1071 }
1072
1073 /* Enable interrupts now. */
1074 reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 |
1075 TWL4030_TBATOR1 | TWL4030_BATSTS);
1076 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
1077 TWL4030_INTERRUPTS_BCIIMR1A);
1078 if (ret < 0) {
1079 dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
1080 return ret;
1081 }
1082
1083 reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV);
1084 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
1085 TWL4030_INTERRUPTS_BCIIMR2A);
1086 if (ret < 0)
1087 dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
1088
1089 twl4030_charger_update_current(bci);
1090 if (device_create_file(&bci->usb->dev, &dev_attr_mode))
1091 dev_warn(&pdev->dev, "could not create sysfs file\n");
1092 if (device_create_file(&bci->ac->dev, &dev_attr_mode))
1093 dev_warn(&pdev->dev, "could not create sysfs file\n");
1094
1095 twl4030_charger_enable_ac(bci, true);
1096 if (!IS_ERR_OR_NULL(bci->transceiver))
1097 twl4030_bci_usb_ncb(&bci->usb_nb,
1098 bci->transceiver->last_event,
1099 NULL);
1100 else
1101 twl4030_charger_enable_usb(bci, false);
1102 if (pdata)
1103 twl4030_charger_enable_backup(pdata->bb_uvolt,
1104 pdata->bb_uamp);
1105 else
1106 twl4030_charger_enable_backup(0, 0);
1107
1108 return 0;
1109 }
1110
twl4030_bci_remove(struct platform_device * pdev)1111 static void twl4030_bci_remove(struct platform_device *pdev)
1112 {
1113 struct twl4030_bci *bci = platform_get_drvdata(pdev);
1114
1115 twl4030_charger_enable_ac(bci, false);
1116 twl4030_charger_enable_usb(bci, false);
1117 twl4030_charger_enable_backup(0, 0);
1118
1119 device_remove_file(&bci->usb->dev, &dev_attr_mode);
1120 device_remove_file(&bci->ac->dev, &dev_attr_mode);
1121 /* mask interrupts */
1122 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
1123 TWL4030_INTERRUPTS_BCIIMR1A);
1124 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
1125 TWL4030_INTERRUPTS_BCIIMR2A);
1126 }
1127
1128 static const struct of_device_id twl_bci_of_match[] __maybe_unused = {
1129 {.compatible = "ti,twl4030-bci", },
1130 { }
1131 };
1132 MODULE_DEVICE_TABLE(of, twl_bci_of_match);
1133
1134 static struct platform_driver twl4030_bci_driver = {
1135 .probe = twl4030_bci_probe,
1136 .remove_new = twl4030_bci_remove,
1137 .driver = {
1138 .name = "twl4030_bci",
1139 .of_match_table = of_match_ptr(twl_bci_of_match),
1140 },
1141 };
1142 module_platform_driver(twl4030_bci_driver);
1143
1144 MODULE_AUTHOR("Gražvydas Ignotas");
1145 MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
1146 MODULE_LICENSE("GPL");
1147 MODULE_ALIAS("platform:twl4030_bci");
1148