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Merge tag 'drm-misc-next-2019-04-04' of git://anongit.freedesktop.org/drm/drm-misc...
[mirror_ubuntu-kernels.git] / drivers / power / supply / twl4030_charger.c
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/mfd/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 */
98 static 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
111 static bool allow_usb;
112 module_param(allow_usb, bool, 0644);
113 MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");
114
115 struct 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 */
156 static const char *modes[] = { "off", "auto", "continuous" };
157
158 /*
159 * clear and set bits on an given register on a given module
160 */
161 static 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
176 static int twl4030_bci_read(u8 reg, u8 *val)
177 {
178 return twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, val, reg);
179 }
180
181 static 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
188 static 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 * TI provided formulas:
210 * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85
211 * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7
212 * Here we use integer approximation of:
213 * CGAIN == 0: val * 1.6618 - 0.85 * 1000
214 * CGAIN == 1: (val * 1.6618 - 0.85 * 1000) * 2
215 */
216 /*
217 * convert twl register value for currents into uA
218 */
219 static int regval2ua(int regval, bool cgain)
220 {
221 if (cgain)
222 return (regval * 16618 - 8500 * 1000) / 5;
223 else
224 return (regval * 16618 - 8500 * 1000) / 10;
225 }
226
227 /*
228 * convert uA currents into twl register value
229 */
230 static int ua2regval(int ua, bool cgain)
231 {
232 int ret;
233 if (cgain)
234 ua /= 2;
235 ret = (ua * 10 + 8500 * 1000) / 16618;
236 /* rounding problems */
237 if (ret < 512)
238 ret = 512;
239 return ret;
240 }
241
242 static int twl4030_charger_update_current(struct twl4030_bci *bci)
243 {
244 int status;
245 int cur;
246 unsigned reg, cur_reg;
247 u8 bcictl1, oldreg, fullreg;
248 bool cgain = false;
249 u8 boot_bci;
250
251 /*
252 * If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11)
253 * and AC is enabled, set current for 'ac'
254 */
255 if (ac_available(bci->channel_vac)) {
256 cur = bci->ac_cur;
257 bci->ac_is_active = true;
258 } else {
259 cur = bci->usb_cur;
260 bci->ac_is_active = false;
261 if (cur > bci->usb_cur_target) {
262 cur = bci->usb_cur_target;
263 bci->usb_cur = cur;
264 }
265 if (cur < bci->usb_cur_target)
266 schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY);
267 }
268
269 /* First, check thresholds and see if cgain is needed */
270 if (bci->ichg_eoc >= 200000)
271 cgain = true;
272 if (bci->ichg_lo >= 400000)
273 cgain = true;
274 if (bci->ichg_hi >= 820000)
275 cgain = true;
276 if (cur > 852000)
277 cgain = true;
278
279 status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
280 if (status < 0)
281 return status;
282 if (twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &boot_bci,
283 TWL4030_PM_MASTER_BOOT_BCI) < 0)
284 boot_bci = 0;
285 boot_bci &= 7;
286
287 if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN))
288 /* Need to turn for charging while we change the
289 * CGAIN bit. Leave it off while everything is
290 * updated.
291 */
292 twl4030_clear_set_boot_bci(boot_bci, 0);
293
294 /*
295 * For ichg_eoc, the hardware only supports reg values matching
296 * 100XXXX000, and requires the XXXX be stored in the high nibble
297 * of TWL4030_BCIMFTH8.
298 */
299 reg = ua2regval(bci->ichg_eoc, cgain);
300 if (reg > 0x278)
301 reg = 0x278;
302 if (reg < 0x200)
303 reg = 0x200;
304 reg = (reg >> 3) & 0xf;
305 fullreg = reg << 4;
306
307 /*
308 * For ichg_lo, reg value must match 10XXXX0000.
309 * XXXX is stored in low nibble of TWL4030_BCIMFTH8.
310 */
311 reg = ua2regval(bci->ichg_lo, cgain);
312 if (reg > 0x2F0)
313 reg = 0x2F0;
314 if (reg < 0x200)
315 reg = 0x200;
316 reg = (reg >> 4) & 0xf;
317 fullreg |= reg;
318
319 /* ichg_eoc and ichg_lo live in same register */
320 status = twl4030_bci_read(TWL4030_BCIMFTH8, &oldreg);
321 if (status < 0)
322 return status;
323 if (oldreg != fullreg) {
324 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xF4,
325 TWL4030_BCIMFKEY);
326 if (status < 0)
327 return status;
328 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
329 fullreg, TWL4030_BCIMFTH8);
330 }
331
332 /* ichg_hi threshold must be 1XXXX01100 (I think) */
333 reg = ua2regval(bci->ichg_hi, cgain);
334 if (reg > 0x3E0)
335 reg = 0x3E0;
336 if (reg < 0x200)
337 reg = 0x200;
338 fullreg = (reg >> 5) & 0xF;
339 fullreg <<= 4;
340 status = twl4030_bci_read(TWL4030_BCIMFTH9, &oldreg);
341 if (status < 0)
342 return status;
343 if ((oldreg & 0xF0) != fullreg) {
344 fullreg |= (oldreg & 0x0F);
345 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
346 TWL4030_BCIMFKEY);
347 if (status < 0)
348 return status;
349 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
350 fullreg, TWL4030_BCIMFTH9);
351 }
352
353 /*
354 * And finally, set the current. This is stored in
355 * two registers.
356 */
357 reg = ua2regval(cur, cgain);
358 /* we have only 10 bits */
359 if (reg > 0x3ff)
360 reg = 0x3ff;
361 status = twl4030_bci_read(TWL4030_BCIIREF1, &oldreg);
362 if (status < 0)
363 return status;
364 cur_reg = oldreg;
365 status = twl4030_bci_read(TWL4030_BCIIREF2, &oldreg);
366 if (status < 0)
367 return status;
368 cur_reg |= oldreg << 8;
369 if (reg != oldreg) {
370 /* disable write protection for one write access for
371 * BCIIREF */
372 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
373 TWL4030_BCIMFKEY);
374 if (status < 0)
375 return status;
376 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
377 (reg & 0x100) ? 3 : 2,
378 TWL4030_BCIIREF2);
379 if (status < 0)
380 return status;
381 /* disable write protection for one write access for
382 * BCIIREF */
383 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
384 TWL4030_BCIMFKEY);
385 if (status < 0)
386 return status;
387 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
388 reg & 0xff,
389 TWL4030_BCIIREF1);
390 }
391 if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN)) {
392 /* Flip CGAIN and re-enable charging */
393 bcictl1 ^= TWL4030_CGAIN;
394 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
395 bcictl1, TWL4030_BCICTL1);
396 twl4030_clear_set_boot_bci(0, boot_bci);
397 }
398 return 0;
399 }
400
401 static int twl4030_charger_get_current(void);
402
403 static void twl4030_current_worker(struct work_struct *data)
404 {
405 int v, curr;
406 int res;
407 struct twl4030_bci *bci = container_of(data, struct twl4030_bci,
408 current_worker.work);
409
410 res = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
411 if (res < 0)
412 v = 0;
413 else
414 /* BCIVBUS uses ADCIN8, 7/1023 V/step */
415 v = res * 6843;
416 curr = twl4030_charger_get_current();
417
418 dev_dbg(bci->dev, "v=%d cur=%d limit=%d target=%d\n", v, curr,
419 bci->usb_cur, bci->usb_cur_target);
420
421 if (v < USB_MIN_VOLT) {
422 /* Back up and stop adjusting. */
423 if (bci->usb_cur >= USB_CUR_STEP)
424 bci->usb_cur -= USB_CUR_STEP;
425 bci->usb_cur_target = bci->usb_cur;
426 } else if (bci->usb_cur >= bci->usb_cur_target ||
427 bci->usb_cur + USB_CUR_STEP > USB_MAX_CURRENT) {
428 /* Reached target and voltage is OK - stop */
429 return;
430 } else {
431 bci->usb_cur += USB_CUR_STEP;
432 schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY);
433 }
434 twl4030_charger_update_current(bci);
435 }
436
437 /*
438 * Enable/Disable USB Charge functionality.
439 */
440 static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
441 {
442 int ret;
443 u32 reg;
444
445 if (bci->usb_mode == CHARGE_OFF)
446 enable = false;
447 if (enable && !IS_ERR_OR_NULL(bci->transceiver)) {
448
449 twl4030_charger_update_current(bci);
450
451 /* Need to keep phy powered */
452 if (!bci->usb_enabled) {
453 pm_runtime_get_sync(bci->transceiver->dev);
454 bci->usb_enabled = 1;
455 }
456
457 if (bci->usb_mode == CHARGE_AUTO) {
458 /* Enable interrupts now. */
459 reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC |
460 TWL4030_TBATOR2 | TWL4030_TBATOR1 |
461 TWL4030_BATSTS);
462 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
463 TWL4030_INTERRUPTS_BCIIMR1A);
464 if (ret < 0) {
465 dev_err(bci->dev,
466 "failed to unmask interrupts: %d\n",
467 ret);
468 return ret;
469 }
470 /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
471 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
472 }
473
474 /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
475 ret = twl4030_clear_set(TWL_MODULE_MAIN_CHARGE, 0,
476 TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
477 if (bci->usb_mode == CHARGE_LINEAR) {
478 /* Enable interrupts now. */
479 reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_TBATOR2 |
480 TWL4030_TBATOR1 | TWL4030_BATSTS);
481 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
482 TWL4030_INTERRUPTS_BCIIMR1A);
483 if (ret < 0) {
484 dev_err(bci->dev,
485 "failed to unmask interrupts: %d\n",
486 ret);
487 return ret;
488 }
489 twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC|TWL4030_CVENAC, 0);
490 /* Watch dog key: WOVF acknowledge */
491 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x33,
492 TWL4030_BCIWDKEY);
493 /* 0x24 + EKEY6: off mode */
494 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a,
495 TWL4030_BCIMDKEY);
496 /* EKEY2: Linear charge: USB path */
497 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x26,
498 TWL4030_BCIMDKEY);
499 /* WDKEY5: stop watchdog count */
500 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf3,
501 TWL4030_BCIWDKEY);
502 /* enable MFEN3 access */
503 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x9c,
504 TWL4030_BCIMFKEY);
505 /* ICHGEOCEN - end-of-charge monitor (current < 80mA)
506 * (charging continues)
507 * ICHGLOWEN - current level monitor (charge continues)
508 * don't monitor over-current or heat save
509 */
510 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf0,
511 TWL4030_BCIMFEN3);
512 }
513 } else {
514 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
515 ret |= twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a,
516 TWL4030_BCIMDKEY);
517 if (bci->usb_enabled) {
518 pm_runtime_mark_last_busy(bci->transceiver->dev);
519 pm_runtime_put_autosuspend(bci->transceiver->dev);
520 bci->usb_enabled = 0;
521 }
522 bci->usb_cur = 0;
523 }
524
525 return ret;
526 }
527
528 /*
529 * Enable/Disable AC Charge funtionality.
530 */
531 static int twl4030_charger_enable_ac(struct twl4030_bci *bci, bool enable)
532 {
533 int ret;
534
535 if (bci->ac_mode == CHARGE_OFF)
536 enable = false;
537
538 if (enable)
539 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
540 else
541 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
542
543 return ret;
544 }
545
546 /*
547 * Enable/Disable charging of Backup Battery.
548 */
549 static int twl4030_charger_enable_backup(int uvolt, int uamp)
550 {
551 int ret;
552 u8 flags;
553
554 if (uvolt < 2500000 ||
555 uamp < 25) {
556 /* disable charging of backup battery */
557 ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
558 TWL4030_BBCHEN, 0, TWL4030_BB_CFG);
559 return ret;
560 }
561
562 flags = TWL4030_BBCHEN;
563 if (uvolt >= 3200000)
564 flags |= TWL4030_BBSEL_3V2;
565 else if (uvolt >= 3100000)
566 flags |= TWL4030_BBSEL_3V1;
567 else if (uvolt >= 3000000)
568 flags |= TWL4030_BBSEL_3V0;
569 else
570 flags |= TWL4030_BBSEL_2V5;
571
572 if (uamp >= 1000)
573 flags |= TWL4030_BBISEL_1000uA;
574 else if (uamp >= 500)
575 flags |= TWL4030_BBISEL_500uA;
576 else if (uamp >= 150)
577 flags |= TWL4030_BBISEL_150uA;
578 else
579 flags |= TWL4030_BBISEL_25uA;
580
581 ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
582 TWL4030_BBSEL_MASK | TWL4030_BBISEL_MASK,
583 flags,
584 TWL4030_BB_CFG);
585
586 return ret;
587 }
588
589 /*
590 * TWL4030 CHG_PRES (AC charger presence) events
591 */
592 static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
593 {
594 struct twl4030_bci *bci = arg;
595
596 dev_dbg(bci->dev, "CHG_PRES irq\n");
597 /* reset current on each 'plug' event */
598 bci->ac_cur = 500000;
599 twl4030_charger_update_current(bci);
600 power_supply_changed(bci->ac);
601 power_supply_changed(bci->usb);
602
603 return IRQ_HANDLED;
604 }
605
606 /*
607 * TWL4030 BCI monitoring events
608 */
609 static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
610 {
611 struct twl4030_bci *bci = arg;
612 u8 irqs1, irqs2;
613 int ret;
614
615 ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
616 TWL4030_INTERRUPTS_BCIISR1A);
617 if (ret < 0)
618 return IRQ_HANDLED;
619
620 ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
621 TWL4030_INTERRUPTS_BCIISR2A);
622 if (ret < 0)
623 return IRQ_HANDLED;
624
625 dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);
626
627 if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) {
628 /* charger state change, inform the core */
629 power_supply_changed(bci->ac);
630 power_supply_changed(bci->usb);
631 }
632 twl4030_charger_update_current(bci);
633
634 /* various monitoring events, for now we just log them here */
635 if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1))
636 dev_warn(bci->dev, "battery temperature out of range\n");
637
638 if (irqs1 & TWL4030_BATSTS)
639 dev_crit(bci->dev, "battery disconnected\n");
640
641 if (irqs2 & TWL4030_VBATOV)
642 dev_crit(bci->dev, "VBAT overvoltage\n");
643
644 if (irqs2 & TWL4030_VBUSOV)
645 dev_crit(bci->dev, "VBUS overvoltage\n");
646
647 if (irqs2 & TWL4030_ACCHGOV)
648 dev_crit(bci->dev, "Ac charger overvoltage\n");
649
650 return IRQ_HANDLED;
651 }
652
653 static void twl4030_bci_usb_work(struct work_struct *data)
654 {
655 struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
656
657 switch (bci->event) {
658 case USB_EVENT_VBUS:
659 case USB_EVENT_CHARGER:
660 twl4030_charger_enable_usb(bci, true);
661 break;
662 case USB_EVENT_NONE:
663 twl4030_charger_enable_usb(bci, false);
664 break;
665 }
666 }
667
668 static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
669 void *priv)
670 {
671 struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb);
672
673 dev_dbg(bci->dev, "OTG notify %lu\n", val);
674
675 /* reset current on each 'plug' event */
676 if (allow_usb)
677 bci->usb_cur_target = 500000;
678 else
679 bci->usb_cur_target = 100000;
680
681 bci->event = val;
682 schedule_work(&bci->work);
683
684 return NOTIFY_OK;
685 }
686
687 /*
688 * sysfs charger enabled store
689 */
690 static ssize_t
691 twl4030_bci_mode_store(struct device *dev, struct device_attribute *attr,
692 const char *buf, size_t n)
693 {
694 struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
695 int mode;
696 int status;
697
698 mode = sysfs_match_string(modes, buf);
699 if (mode < 0)
700 return mode;
701
702 if (dev == &bci->ac->dev) {
703 if (mode == 2)
704 return -EINVAL;
705 twl4030_charger_enable_ac(bci, false);
706 bci->ac_mode = mode;
707 status = twl4030_charger_enable_ac(bci, true);
708 } else {
709 twl4030_charger_enable_usb(bci, false);
710 bci->usb_mode = mode;
711 status = twl4030_charger_enable_usb(bci, true);
712 }
713 return (status == 0) ? n : status;
714 }
715
716 /*
717 * sysfs charger enabled show
718 */
719 static ssize_t
720 twl4030_bci_mode_show(struct device *dev,
721 struct device_attribute *attr, char *buf)
722 {
723 struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
724 int len = 0;
725 int i;
726 int mode = bci->usb_mode;
727
728 if (dev == &bci->ac->dev)
729 mode = bci->ac_mode;
730
731 for (i = 0; i < ARRAY_SIZE(modes); i++)
732 if (mode == i)
733 len += snprintf(buf+len, PAGE_SIZE-len,
734 "[%s] ", modes[i]);
735 else
736 len += snprintf(buf+len, PAGE_SIZE-len,
737 "%s ", modes[i]);
738 buf[len-1] = '\n';
739 return len;
740 }
741 static DEVICE_ATTR(mode, 0644, twl4030_bci_mode_show,
742 twl4030_bci_mode_store);
743
744 static int twl4030_charger_get_current(void)
745 {
746 int curr;
747 int ret;
748 u8 bcictl1;
749
750 curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
751 if (curr < 0)
752 return curr;
753
754 ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
755 if (ret)
756 return ret;
757
758 return regval2ua(curr, bcictl1 & TWL4030_CGAIN);
759 }
760
761 /*
762 * Returns the main charge FSM state
763 * Or < 0 on failure.
764 */
765 static int twl4030bci_state(struct twl4030_bci *bci)
766 {
767 int ret;
768 u8 state;
769
770 ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
771 if (ret) {
772 dev_err(bci->dev, "error reading BCIMSTATEC\n");
773 return ret;
774 }
775
776 dev_dbg(bci->dev, "state: %02x\n", state);
777
778 return state;
779 }
780
781 static int twl4030_bci_state_to_status(int state)
782 {
783 state &= TWL4030_MSTATEC_MASK;
784 if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
785 return POWER_SUPPLY_STATUS_CHARGING;
786 else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
787 state <= TWL4030_MSTATEC_COMPLETE4)
788 return POWER_SUPPLY_STATUS_FULL;
789 else
790 return POWER_SUPPLY_STATUS_NOT_CHARGING;
791 }
792
793 static int twl4030_bci_get_property(struct power_supply *psy,
794 enum power_supply_property psp,
795 union power_supply_propval *val)
796 {
797 struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent);
798 int is_charging;
799 int state;
800 int ret;
801
802 state = twl4030bci_state(bci);
803 if (state < 0)
804 return state;
805
806 if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
807 is_charging = state & TWL4030_MSTATEC_USB;
808 else
809 is_charging = state & TWL4030_MSTATEC_AC;
810 if (!is_charging) {
811 u8 s;
812 ret = twl4030_bci_read(TWL4030_BCIMDEN, &s);
813 if (ret < 0)
814 return ret;
815 if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
816 is_charging = s & 1;
817 else
818 is_charging = s & 2;
819 if (is_charging)
820 /* A little white lie */
821 state = TWL4030_MSTATEC_QUICK1;
822 }
823
824 switch (psp) {
825 case POWER_SUPPLY_PROP_STATUS:
826 if (is_charging)
827 val->intval = twl4030_bci_state_to_status(state);
828 else
829 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
830 break;
831 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
832 /* charging must be active for meaningful result */
833 if (!is_charging)
834 return -ENODATA;
835 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) {
836 ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
837 if (ret < 0)
838 return ret;
839 /* BCIVBUS uses ADCIN8, 7/1023 V/step */
840 val->intval = ret * 6843;
841 } else {
842 ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
843 if (ret < 0)
844 return ret;
845 /* BCIVAC uses ADCIN11, 10/1023 V/step */
846 val->intval = ret * 9775;
847 }
848 break;
849 case POWER_SUPPLY_PROP_CURRENT_NOW:
850 if (!is_charging)
851 return -ENODATA;
852 /* current measurement is shared between AC and USB */
853 ret = twl4030_charger_get_current();
854 if (ret < 0)
855 return ret;
856 val->intval = ret;
857 break;
858 case POWER_SUPPLY_PROP_ONLINE:
859 val->intval = is_charging &&
860 twl4030_bci_state_to_status(state) !=
861 POWER_SUPPLY_STATUS_NOT_CHARGING;
862 break;
863 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
864 val->intval = -1;
865 if (psy->desc->type != POWER_SUPPLY_TYPE_USB) {
866 if (!bci->ac_is_active)
867 val->intval = bci->ac_cur;
868 } else {
869 if (bci->ac_is_active)
870 val->intval = bci->usb_cur_target;
871 }
872 if (val->intval < 0) {
873 u8 bcictl1;
874
875 val->intval = twl4030bci_read_adc_val(TWL4030_BCIIREF1);
876 if (val->intval < 0)
877 return val->intval;
878 ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
879 if (ret < 0)
880 return ret;
881 val->intval = regval2ua(val->intval, bcictl1 &
882 TWL4030_CGAIN);
883 }
884 break;
885 default:
886 return -EINVAL;
887 }
888
889 return 0;
890 }
891
892 static int twl4030_bci_set_property(struct power_supply *psy,
893 enum power_supply_property psp,
894 const union power_supply_propval *val)
895 {
896 struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent);
897
898 switch (psp) {
899 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
900 if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
901 bci->usb_cur_target = val->intval;
902 else
903 bci->ac_cur = val->intval;
904 twl4030_charger_update_current(bci);
905 break;
906 default:
907 return -EINVAL;
908 }
909
910 return 0;
911 }
912
913 static int twl4030_bci_property_is_writeable(struct power_supply *psy,
914 enum power_supply_property psp)
915 {
916 switch (psp) {
917 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
918 return true;
919 default:
920 return false;
921 }
922 }
923
924 static enum power_supply_property twl4030_charger_props[] = {
925 POWER_SUPPLY_PROP_STATUS,
926 POWER_SUPPLY_PROP_ONLINE,
927 POWER_SUPPLY_PROP_VOLTAGE_NOW,
928 POWER_SUPPLY_PROP_CURRENT_NOW,
929 POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
930 };
931
932 #ifdef CONFIG_OF
933 static const struct twl4030_bci_platform_data *
934 twl4030_bci_parse_dt(struct device *dev)
935 {
936 struct device_node *np = dev->of_node;
937 struct twl4030_bci_platform_data *pdata;
938 u32 num;
939
940 if (!np)
941 return NULL;
942 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
943 if (!pdata)
944 return pdata;
945
946 if (of_property_read_u32(np, "ti,bb-uvolt", &num) == 0)
947 pdata->bb_uvolt = num;
948 if (of_property_read_u32(np, "ti,bb-uamp", &num) == 0)
949 pdata->bb_uamp = num;
950 return pdata;
951 }
952 #else
953 static inline const struct twl4030_bci_platform_data *
954 twl4030_bci_parse_dt(struct device *dev)
955 {
956 return NULL;
957 }
958 #endif
959
960 static const struct power_supply_desc twl4030_bci_ac_desc = {
961 .name = "twl4030_ac",
962 .type = POWER_SUPPLY_TYPE_MAINS,
963 .properties = twl4030_charger_props,
964 .num_properties = ARRAY_SIZE(twl4030_charger_props),
965 .get_property = twl4030_bci_get_property,
966 .set_property = twl4030_bci_set_property,
967 .property_is_writeable = twl4030_bci_property_is_writeable,
968 };
969
970 static const struct power_supply_desc twl4030_bci_usb_desc = {
971 .name = "twl4030_usb",
972 .type = POWER_SUPPLY_TYPE_USB,
973 .properties = twl4030_charger_props,
974 .num_properties = ARRAY_SIZE(twl4030_charger_props),
975 .get_property = twl4030_bci_get_property,
976 .set_property = twl4030_bci_set_property,
977 .property_is_writeable = twl4030_bci_property_is_writeable,
978 };
979
980 static int twl4030_bci_probe(struct platform_device *pdev)
981 {
982 struct twl4030_bci *bci;
983 const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;
984 int ret;
985 u32 reg;
986
987 bci = devm_kzalloc(&pdev->dev, sizeof(*bci), GFP_KERNEL);
988 if (bci == NULL)
989 return -ENOMEM;
990
991 if (!pdata)
992 pdata = twl4030_bci_parse_dt(&pdev->dev);
993
994 bci->ichg_eoc = 80100; /* Stop charging when current drops to here */
995 bci->ichg_lo = 241000; /* Low threshold */
996 bci->ichg_hi = 500000; /* High threshold */
997 bci->ac_cur = 500000; /* 500mA */
998 if (allow_usb)
999 bci->usb_cur_target = 500000; /* 500mA */
1000 else
1001 bci->usb_cur_target = 100000; /* 100mA */
1002 bci->usb_mode = CHARGE_AUTO;
1003 bci->ac_mode = CHARGE_AUTO;
1004
1005 bci->dev = &pdev->dev;
1006 bci->irq_chg = platform_get_irq(pdev, 0);
1007 bci->irq_bci = platform_get_irq(pdev, 1);
1008
1009 platform_set_drvdata(pdev, bci);
1010
1011 INIT_WORK(&bci->work, twl4030_bci_usb_work);
1012 INIT_DELAYED_WORK(&bci->current_worker, twl4030_current_worker);
1013
1014 bci->channel_vac = devm_iio_channel_get(&pdev->dev, "vac");
1015 if (IS_ERR(bci->channel_vac)) {
1016 ret = PTR_ERR(bci->channel_vac);
1017 if (ret == -EPROBE_DEFER)
1018 return ret; /* iio not ready */
1019 dev_warn(&pdev->dev, "could not request vac iio channel (%d)",
1020 ret);
1021 bci->channel_vac = NULL;
1022 }
1023
1024 if (bci->dev->of_node) {
1025 struct device_node *phynode;
1026
1027 phynode = of_get_compatible_child(bci->dev->of_node->parent,
1028 "ti,twl4030-usb");
1029 if (phynode) {
1030 bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
1031 bci->transceiver = devm_usb_get_phy_by_node(
1032 bci->dev, phynode, &bci->usb_nb);
1033 of_node_put(phynode);
1034 if (IS_ERR(bci->transceiver)) {
1035 ret = PTR_ERR(bci->transceiver);
1036 if (ret == -EPROBE_DEFER)
1037 return ret; /* phy not ready */
1038 dev_warn(&pdev->dev, "could not request transceiver (%d)",
1039 ret);
1040 bci->transceiver = NULL;
1041 }
1042 }
1043 }
1044
1045 bci->ac = devm_power_supply_register(&pdev->dev, &twl4030_bci_ac_desc,
1046 NULL);
1047 if (IS_ERR(bci->ac)) {
1048 ret = PTR_ERR(bci->ac);
1049 dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
1050 return ret;
1051 }
1052
1053 bci->usb = devm_power_supply_register(&pdev->dev, &twl4030_bci_usb_desc,
1054 NULL);
1055 if (IS_ERR(bci->usb)) {
1056 ret = PTR_ERR(bci->usb);
1057 dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
1058 return ret;
1059 }
1060
1061 ret = devm_request_threaded_irq(&pdev->dev, bci->irq_chg, NULL,
1062 twl4030_charger_interrupt, IRQF_ONESHOT, pdev->name,
1063 bci);
1064 if (ret < 0) {
1065 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
1066 bci->irq_chg, ret);
1067 return ret;
1068 }
1069
1070 ret = devm_request_threaded_irq(&pdev->dev, bci->irq_bci, NULL,
1071 twl4030_bci_interrupt, IRQF_ONESHOT, pdev->name, bci);
1072 if (ret < 0) {
1073 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
1074 bci->irq_bci, ret);
1075 return ret;
1076 }
1077
1078 /* Enable interrupts now. */
1079 reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 |
1080 TWL4030_TBATOR1 | TWL4030_BATSTS);
1081 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
1082 TWL4030_INTERRUPTS_BCIIMR1A);
1083 if (ret < 0) {
1084 dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
1085 return ret;
1086 }
1087
1088 reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV);
1089 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
1090 TWL4030_INTERRUPTS_BCIIMR2A);
1091 if (ret < 0)
1092 dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
1093
1094 twl4030_charger_update_current(bci);
1095 if (device_create_file(&bci->usb->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_mode))
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;
1114 }
1115
1116 static int twl4030_bci_remove(struct platform_device *pdev)
1117 {
1118 struct twl4030_bci *bci = platform_get_drvdata(pdev);
1119
1120 twl4030_charger_enable_ac(bci, false);
1121 twl4030_charger_enable_usb(bci, false);
1122 twl4030_charger_enable_backup(0, 0);
1123
1124 device_remove_file(&bci->usb->dev, &dev_attr_mode);
1125 device_remove_file(&bci->ac->dev, &dev_attr_mode);
1126 /* mask interrupts */
1127 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
1128 TWL4030_INTERRUPTS_BCIIMR1A);
1129 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
1130 TWL4030_INTERRUPTS_BCIIMR2A);
1131
1132 return 0;
1133 }
1134
1135 static const struct of_device_id twl_bci_of_match[] = {
1136 {.compatible = "ti,twl4030-bci", },
1137 { }
1138 };
1139 MODULE_DEVICE_TABLE(of, twl_bci_of_match);
1140
1141 static struct platform_driver twl4030_bci_driver = {
1142 .probe = twl4030_bci_probe,
1143 .remove = twl4030_bci_remove,
1144 .driver = {
1145 .name = "twl4030_bci",
1146 .of_match_table = of_match_ptr(twl_bci_of_match),
1147 },
1148 };
1149 module_platform_driver(twl4030_bci_driver);
1150
1151 MODULE_AUTHOR("Gražvydas Ignotas");
1152 MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
1153 MODULE_LICENSE("GPL");
1154 MODULE_ALIAS("platform:twl4030_bci");
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