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Merge tag 'asoc-v4.3-rc6' into asoc-fix-rcar
[deliverable/linux.git] / drivers / power / 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/i2c/twl.h>
22 #include <linux/power_supply.h>
23 #include <linux/notifier.h>
24 #include <linux/usb/otg.h>
25 #include <linux/i2c/twl4030-madc.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 #if IS_REACHABLE(CONFIG_TWL4030_MADC)
95 /*
96 * If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11)
97 * then AC is available.
98 */
99 static inline int ac_available(void)
100 {
101 return twl4030_get_madc_conversion(11) > 4500;
102 }
103 #else
104 static inline int ac_available(void)
105 {
106 return 0;
107 }
108 #endif
109 static bool allow_usb;
110 module_param(allow_usb, bool, 0644);
111 MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");
112
113 struct twl4030_bci {
114 struct device *dev;
115 struct power_supply *ac;
116 struct power_supply *usb;
117 struct usb_phy *transceiver;
118 struct notifier_block usb_nb;
119 struct work_struct work;
120 int irq_chg;
121 int irq_bci;
122 int usb_enabled;
123
124 /*
125 * ichg_* and *_cur values in uA. If any are 'large', we set
126 * CGAIN to '1' which doubles the range for half the
127 * precision.
128 */
129 unsigned int ichg_eoc, ichg_lo, ichg_hi;
130 unsigned int usb_cur, ac_cur;
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 char *modes[] = { "off", "auto", "continuous" };
154
155 /*
156 * clear and set bits on an given register on a given module
157 */
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
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
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
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 * Check if Battery Pack was present
207 */
208 static int twl4030_is_battery_present(struct twl4030_bci *bci)
209 {
210 int ret;
211 u8 val = 0;
212
213 /* Battery presence in Main charge? */
214 ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, &val, TWL4030_BCIMFSTS3);
215 if (ret)
216 return ret;
217 if (val & TWL4030_BATSTSMCHG)
218 return 0;
219
220 /*
221 * OK, It could be that bootloader did not enable main charger,
222 * pre-charge is h/w auto. So, Battery presence in Pre-charge?
223 */
224 ret = twl_i2c_read_u8(TWL4030_MODULE_PRECHARGE, &val,
225 TWL4030_BCIMFSTS1);
226 if (ret)
227 return ret;
228 if (val & TWL4030_BATSTSPCHG)
229 return 0;
230
231 return -ENODEV;
232 }
233
234 /*
235 * TI provided formulas:
236 * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85
237 * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7
238 * Here we use integer approximation of:
239 * CGAIN == 0: val * 1.6618 - 0.85 * 1000
240 * CGAIN == 1: (val * 1.6618 - 0.85 * 1000) * 2
241 */
242 /*
243 * convert twl register value for currents into uA
244 */
245 static int regval2ua(int regval, bool cgain)
246 {
247 if (cgain)
248 return (regval * 16618 - 8500 * 1000) / 5;
249 else
250 return (regval * 16618 - 8500 * 1000) / 10;
251 }
252
253 /*
254 * convert uA currents into twl register value
255 */
256 static int ua2regval(int ua, bool cgain)
257 {
258 int ret;
259 if (cgain)
260 ua /= 2;
261 ret = (ua * 10 + 8500 * 1000) / 16618;
262 /* rounding problems */
263 if (ret < 512)
264 ret = 512;
265 return ret;
266 }
267
268 static int twl4030_charger_update_current(struct twl4030_bci *bci)
269 {
270 int status;
271 int cur;
272 unsigned reg, cur_reg;
273 u8 bcictl1, oldreg, fullreg;
274 bool cgain = false;
275 u8 boot_bci;
276
277 /*
278 * If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11)
279 * and AC is enabled, set current for 'ac'
280 */
281 if (ac_available()) {
282 cur = bci->ac_cur;
283 bci->ac_is_active = true;
284 } else {
285 cur = bci->usb_cur;
286 bci->ac_is_active = false;
287 if (cur > bci->usb_cur_target) {
288 cur = bci->usb_cur_target;
289 bci->usb_cur = cur;
290 }
291 if (cur < bci->usb_cur_target)
292 schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY);
293 }
294
295 /* First, check thresholds and see if cgain is needed */
296 if (bci->ichg_eoc >= 200000)
297 cgain = true;
298 if (bci->ichg_lo >= 400000)
299 cgain = true;
300 if (bci->ichg_hi >= 820000)
301 cgain = true;
302 if (cur > 852000)
303 cgain = true;
304
305 status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
306 if (status < 0)
307 return status;
308 if (twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &boot_bci,
309 TWL4030_PM_MASTER_BOOT_BCI) < 0)
310 boot_bci = 0;
311 boot_bci &= 7;
312
313 if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN))
314 /* Need to turn for charging while we change the
315 * CGAIN bit. Leave it off while everything is
316 * updated.
317 */
318 twl4030_clear_set_boot_bci(boot_bci, 0);
319
320 /*
321 * For ichg_eoc, the hardware only supports reg values matching
322 * 100XXXX000, and requires the XXXX be stored in the high nibble
323 * of TWL4030_BCIMFTH8.
324 */
325 reg = ua2regval(bci->ichg_eoc, cgain);
326 if (reg > 0x278)
327 reg = 0x278;
328 if (reg < 0x200)
329 reg = 0x200;
330 reg = (reg >> 3) & 0xf;
331 fullreg = reg << 4;
332
333 /*
334 * For ichg_lo, reg value must match 10XXXX0000.
335 * XXXX is stored in low nibble of TWL4030_BCIMFTH8.
336 */
337 reg = ua2regval(bci->ichg_lo, cgain);
338 if (reg > 0x2F0)
339 reg = 0x2F0;
340 if (reg < 0x200)
341 reg = 0x200;
342 reg = (reg >> 4) & 0xf;
343 fullreg |= reg;
344
345 /* ichg_eoc and ichg_lo live in same register */
346 status = twl4030_bci_read(TWL4030_BCIMFTH8, &oldreg);
347 if (status < 0)
348 return status;
349 if (oldreg != fullreg) {
350 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xF4,
351 TWL4030_BCIMFKEY);
352 if (status < 0)
353 return status;
354 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
355 fullreg, TWL4030_BCIMFTH8);
356 }
357
358 /* ichg_hi threshold must be 1XXXX01100 (I think) */
359 reg = ua2regval(bci->ichg_hi, cgain);
360 if (reg > 0x3E0)
361 reg = 0x3E0;
362 if (reg < 0x200)
363 reg = 0x200;
364 fullreg = (reg >> 5) & 0xF;
365 fullreg <<= 4;
366 status = twl4030_bci_read(TWL4030_BCIMFTH9, &oldreg);
367 if (status < 0)
368 return status;
369 if ((oldreg & 0xF0) != fullreg) {
370 fullreg |= (oldreg & 0x0F);
371 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
372 TWL4030_BCIMFKEY);
373 if (status < 0)
374 return status;
375 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
376 fullreg, TWL4030_BCIMFTH9);
377 }
378
379 /*
380 * And finally, set the current. This is stored in
381 * two registers.
382 */
383 reg = ua2regval(cur, cgain);
384 /* we have only 10 bits */
385 if (reg > 0x3ff)
386 reg = 0x3ff;
387 status = twl4030_bci_read(TWL4030_BCIIREF1, &oldreg);
388 if (status < 0)
389 return status;
390 cur_reg = oldreg;
391 status = twl4030_bci_read(TWL4030_BCIIREF2, &oldreg);
392 if (status < 0)
393 return status;
394 cur_reg |= oldreg << 8;
395 if (reg != oldreg) {
396 /* disable write protection for one write access for
397 * BCIIREF */
398 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
399 TWL4030_BCIMFKEY);
400 if (status < 0)
401 return status;
402 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
403 (reg & 0x100) ? 3 : 2,
404 TWL4030_BCIIREF2);
405 if (status < 0)
406 return status;
407 /* disable write protection for one write access for
408 * BCIIREF */
409 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
410 TWL4030_BCIMFKEY);
411 if (status < 0)
412 return status;
413 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
414 reg & 0xff,
415 TWL4030_BCIIREF1);
416 }
417 if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN)) {
418 /* Flip CGAIN and re-enable charging */
419 bcictl1 ^= TWL4030_CGAIN;
420 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
421 bcictl1, TWL4030_BCICTL1);
422 twl4030_clear_set_boot_bci(0, boot_bci);
423 }
424 return 0;
425 }
426
427 static int twl4030_charger_get_current(void);
428
429 static void twl4030_current_worker(struct work_struct *data)
430 {
431 int v, curr;
432 int res;
433 struct twl4030_bci *bci = container_of(data, struct twl4030_bci,
434 current_worker.work);
435
436 res = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
437 if (res < 0)
438 v = 0;
439 else
440 /* BCIVBUS uses ADCIN8, 7/1023 V/step */
441 v = res * 6843;
442 curr = twl4030_charger_get_current();
443
444 dev_dbg(bci->dev, "v=%d cur=%d limit=%d target=%d\n", v, curr,
445 bci->usb_cur, bci->usb_cur_target);
446
447 if (v < USB_MIN_VOLT) {
448 /* Back up and stop adjusting. */
449 bci->usb_cur -= USB_CUR_STEP;
450 bci->usb_cur_target = bci->usb_cur;
451 } else if (bci->usb_cur >= bci->usb_cur_target ||
452 bci->usb_cur + USB_CUR_STEP > USB_MAX_CURRENT) {
453 /* Reached target and voltage is OK - stop */
454 return;
455 } else {
456 bci->usb_cur += USB_CUR_STEP;
457 schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY);
458 }
459 twl4030_charger_update_current(bci);
460 }
461
462 /*
463 * Enable/Disable USB Charge functionality.
464 */
465 static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
466 {
467 int ret;
468
469 if (bci->usb_mode == CHARGE_OFF)
470 enable = false;
471 if (enable && !IS_ERR_OR_NULL(bci->transceiver)) {
472
473 twl4030_charger_update_current(bci);
474
475 /* Need to keep phy powered */
476 if (!bci->usb_enabled) {
477 pm_runtime_get_sync(bci->transceiver->dev);
478 bci->usb_enabled = 1;
479 }
480
481 if (bci->usb_mode == CHARGE_AUTO)
482 /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
483 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
484
485 /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
486 ret = twl4030_clear_set(TWL_MODULE_MAIN_CHARGE, 0,
487 TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
488 if (bci->usb_mode == CHARGE_LINEAR) {
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 /*
654 * Provide "max_current" attribute in sysfs.
655 */
656 static ssize_t
657 twl4030_bci_max_current_store(struct device *dev, struct device_attribute *attr,
658 const char *buf, size_t n)
659 {
660 struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
661 int cur = 0;
662 int status = 0;
663 status = kstrtoint(buf, 10, &cur);
664 if (status)
665 return status;
666 if (cur < 0)
667 return -EINVAL;
668 if (dev == &bci->ac->dev)
669 bci->ac_cur = cur;
670 else
671 bci->usb_cur_target = cur;
672
673 twl4030_charger_update_current(bci);
674 return n;
675 }
676
677 /*
678 * sysfs max_current show
679 */
680 static ssize_t twl4030_bci_max_current_show(struct device *dev,
681 struct device_attribute *attr, char *buf)
682 {
683 int status = 0;
684 int cur = -1;
685 u8 bcictl1;
686 struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
687
688 if (dev == &bci->ac->dev) {
689 if (!bci->ac_is_active)
690 cur = bci->ac_cur;
691 } else {
692 if (bci->ac_is_active)
693 cur = bci->usb_cur_target;
694 }
695 if (cur < 0) {
696 cur = twl4030bci_read_adc_val(TWL4030_BCIIREF1);
697 if (cur < 0)
698 return cur;
699 status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
700 if (status < 0)
701 return status;
702 cur = regval2ua(cur, bcictl1 & TWL4030_CGAIN);
703 }
704 return scnprintf(buf, PAGE_SIZE, "%u\n", cur);
705 }
706
707 static DEVICE_ATTR(max_current, 0644, twl4030_bci_max_current_show,
708 twl4030_bci_max_current_store);
709
710 static void twl4030_bci_usb_work(struct work_struct *data)
711 {
712 struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
713
714 switch (bci->event) {
715 case USB_EVENT_VBUS:
716 case USB_EVENT_CHARGER:
717 twl4030_charger_enable_usb(bci, true);
718 break;
719 case USB_EVENT_NONE:
720 twl4030_charger_enable_usb(bci, false);
721 break;
722 }
723 }
724
725 static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
726 void *priv)
727 {
728 struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb);
729
730 dev_dbg(bci->dev, "OTG notify %lu\n", val);
731
732 /* reset current on each 'plug' event */
733 if (allow_usb)
734 bci->usb_cur_target = 500000;
735 else
736 bci->usb_cur_target = 100000;
737
738 bci->event = val;
739 schedule_work(&bci->work);
740
741 return NOTIFY_OK;
742 }
743
744 /*
745 * sysfs charger enabled store
746 */
747 static ssize_t
748 twl4030_bci_mode_store(struct device *dev, struct device_attribute *attr,
749 const char *buf, size_t n)
750 {
751 struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
752 int mode;
753 int status;
754
755 if (sysfs_streq(buf, modes[0]))
756 mode = 0;
757 else if (sysfs_streq(buf, modes[1]))
758 mode = 1;
759 else if (sysfs_streq(buf, modes[2]))
760 mode = 2;
761 else
762 return -EINVAL;
763 if (dev == &bci->ac->dev) {
764 if (mode == 2)
765 return -EINVAL;
766 twl4030_charger_enable_ac(bci, false);
767 bci->ac_mode = mode;
768 status = twl4030_charger_enable_ac(bci, true);
769 } else {
770 twl4030_charger_enable_usb(bci, false);
771 bci->usb_mode = mode;
772 status = twl4030_charger_enable_usb(bci, true);
773 }
774 return (status == 0) ? n : status;
775 }
776
777 /*
778 * sysfs charger enabled show
779 */
780 static ssize_t
781 twl4030_bci_mode_show(struct device *dev,
782 struct device_attribute *attr, char *buf)
783 {
784 struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
785 int len = 0;
786 int i;
787 int mode = bci->usb_mode;
788
789 if (dev == &bci->ac->dev)
790 mode = bci->ac_mode;
791
792 for (i = 0; i < ARRAY_SIZE(modes); i++)
793 if (mode == i)
794 len += snprintf(buf+len, PAGE_SIZE-len,
795 "[%s] ", modes[i]);
796 else
797 len += snprintf(buf+len, PAGE_SIZE-len,
798 "%s ", modes[i]);
799 buf[len-1] = '\n';
800 return len;
801 }
802 static DEVICE_ATTR(mode, 0644, twl4030_bci_mode_show,
803 twl4030_bci_mode_store);
804
805 static int twl4030_charger_get_current(void)
806 {
807 int curr;
808 int ret;
809 u8 bcictl1;
810
811 curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
812 if (curr < 0)
813 return curr;
814
815 ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
816 if (ret)
817 return ret;
818
819 return regval2ua(curr, bcictl1 & TWL4030_CGAIN);
820 }
821
822 /*
823 * Returns the main charge FSM state
824 * Or < 0 on failure.
825 */
826 static int twl4030bci_state(struct twl4030_bci *bci)
827 {
828 int ret;
829 u8 state;
830
831 ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
832 if (ret) {
833 pr_err("twl4030_bci: error reading BCIMSTATEC\n");
834 return ret;
835 }
836
837 dev_dbg(bci->dev, "state: %02x\n", state);
838
839 return state;
840 }
841
842 static int twl4030_bci_state_to_status(int state)
843 {
844 state &= TWL4030_MSTATEC_MASK;
845 if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
846 return POWER_SUPPLY_STATUS_CHARGING;
847 else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
848 state <= TWL4030_MSTATEC_COMPLETE4)
849 return POWER_SUPPLY_STATUS_FULL;
850 else
851 return POWER_SUPPLY_STATUS_NOT_CHARGING;
852 }
853
854 static int twl4030_bci_get_property(struct power_supply *psy,
855 enum power_supply_property psp,
856 union power_supply_propval *val)
857 {
858 struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent);
859 int is_charging;
860 int state;
861 int ret;
862
863 state = twl4030bci_state(bci);
864 if (state < 0)
865 return state;
866
867 if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
868 is_charging = state & TWL4030_MSTATEC_USB;
869 else
870 is_charging = state & TWL4030_MSTATEC_AC;
871 if (!is_charging) {
872 u8 s;
873 twl4030_bci_read(TWL4030_BCIMDEN, &s);
874 if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
875 is_charging = s & 1;
876 else
877 is_charging = s & 2;
878 if (is_charging)
879 /* A little white lie */
880 state = TWL4030_MSTATEC_QUICK1;
881 }
882
883 switch (psp) {
884 case POWER_SUPPLY_PROP_STATUS:
885 if (is_charging)
886 val->intval = twl4030_bci_state_to_status(state);
887 else
888 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
889 break;
890 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
891 /* charging must be active for meaningful result */
892 if (!is_charging)
893 return -ENODATA;
894 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) {
895 ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
896 if (ret < 0)
897 return ret;
898 /* BCIVBUS uses ADCIN8, 7/1023 V/step */
899 val->intval = ret * 6843;
900 } else {
901 ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
902 if (ret < 0)
903 return ret;
904 /* BCIVAC uses ADCIN11, 10/1023 V/step */
905 val->intval = ret * 9775;
906 }
907 break;
908 case POWER_SUPPLY_PROP_CURRENT_NOW:
909 if (!is_charging)
910 return -ENODATA;
911 /* current measurement is shared between AC and USB */
912 ret = twl4030_charger_get_current();
913 if (ret < 0)
914 return ret;
915 val->intval = ret;
916 break;
917 case POWER_SUPPLY_PROP_ONLINE:
918 val->intval = is_charging &&
919 twl4030_bci_state_to_status(state) !=
920 POWER_SUPPLY_STATUS_NOT_CHARGING;
921 break;
922 default:
923 return -EINVAL;
924 }
925
926 return 0;
927 }
928
929 static enum power_supply_property twl4030_charger_props[] = {
930 POWER_SUPPLY_PROP_STATUS,
931 POWER_SUPPLY_PROP_ONLINE,
932 POWER_SUPPLY_PROP_VOLTAGE_NOW,
933 POWER_SUPPLY_PROP_CURRENT_NOW,
934 };
935
936 #ifdef CONFIG_OF
937 static const struct twl4030_bci_platform_data *
938 twl4030_bci_parse_dt(struct device *dev)
939 {
940 struct device_node *np = dev->of_node;
941 struct twl4030_bci_platform_data *pdata;
942 u32 num;
943
944 if (!np)
945 return NULL;
946 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
947 if (!pdata)
948 return pdata;
949
950 if (of_property_read_u32(np, "ti,bb-uvolt", &num) == 0)
951 pdata->bb_uvolt = num;
952 if (of_property_read_u32(np, "ti,bb-uamp", &num) == 0)
953 pdata->bb_uamp = num;
954 return pdata;
955 }
956 #else
957 static inline const struct twl4030_bci_platform_data *
958 twl4030_bci_parse_dt(struct device *dev)
959 {
960 return NULL;
961 }
962 #endif
963
964 static const struct power_supply_desc twl4030_bci_ac_desc = {
965 .name = "twl4030_ac",
966 .type = POWER_SUPPLY_TYPE_MAINS,
967 .properties = twl4030_charger_props,
968 .num_properties = ARRAY_SIZE(twl4030_charger_props),
969 .get_property = twl4030_bci_get_property,
970 };
971
972 static const struct power_supply_desc twl4030_bci_usb_desc = {
973 .name = "twl4030_usb",
974 .type = POWER_SUPPLY_TYPE_USB,
975 .properties = twl4030_charger_props,
976 .num_properties = ARRAY_SIZE(twl4030_charger_props),
977 .get_property = twl4030_bci_get_property,
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 /* Only proceed further *IF* battery is physically present */
1010 ret = twl4030_is_battery_present(bci);
1011 if (ret) {
1012 dev_crit(&pdev->dev, "Battery was not detected:%d\n", ret);
1013 return ret;
1014 }
1015
1016 platform_set_drvdata(pdev, bci);
1017
1018 bci->ac = devm_power_supply_register(&pdev->dev, &twl4030_bci_ac_desc,
1019 NULL);
1020 if (IS_ERR(bci->ac)) {
1021 ret = PTR_ERR(bci->ac);
1022 dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
1023 return ret;
1024 }
1025
1026 bci->usb = devm_power_supply_register(&pdev->dev, &twl4030_bci_usb_desc,
1027 NULL);
1028 if (IS_ERR(bci->usb)) {
1029 ret = PTR_ERR(bci->usb);
1030 dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
1031 return ret;
1032 }
1033
1034 ret = devm_request_threaded_irq(&pdev->dev, bci->irq_chg, NULL,
1035 twl4030_charger_interrupt, IRQF_ONESHOT, pdev->name,
1036 bci);
1037 if (ret < 0) {
1038 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
1039 bci->irq_chg, ret);
1040 return ret;
1041 }
1042
1043 ret = devm_request_threaded_irq(&pdev->dev, bci->irq_bci, NULL,
1044 twl4030_bci_interrupt, IRQF_ONESHOT, pdev->name, bci);
1045 if (ret < 0) {
1046 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
1047 bci->irq_bci, ret);
1048 return ret;
1049 }
1050
1051 INIT_WORK(&bci->work, twl4030_bci_usb_work);
1052 INIT_DELAYED_WORK(&bci->current_worker, twl4030_current_worker);
1053
1054 bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
1055 if (bci->dev->of_node) {
1056 struct device_node *phynode;
1057
1058 phynode = of_find_compatible_node(bci->dev->of_node->parent,
1059 NULL, "ti,twl4030-usb");
1060 if (phynode)
1061 bci->transceiver = devm_usb_get_phy_by_node(
1062 bci->dev, phynode, &bci->usb_nb);
1063 }
1064
1065 /* Enable interrupts now. */
1066 reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 |
1067 TWL4030_TBATOR1 | TWL4030_BATSTS);
1068 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
1069 TWL4030_INTERRUPTS_BCIIMR1A);
1070 if (ret < 0) {
1071 dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
1072 return ret;
1073 }
1074
1075 reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV);
1076 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
1077 TWL4030_INTERRUPTS_BCIIMR2A);
1078 if (ret < 0)
1079 dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
1080
1081 twl4030_charger_update_current(bci);
1082 if (device_create_file(&bci->usb->dev, &dev_attr_max_current))
1083 dev_warn(&pdev->dev, "could not create sysfs file\n");
1084 if (device_create_file(&bci->usb->dev, &dev_attr_mode))
1085 dev_warn(&pdev->dev, "could not create sysfs file\n");
1086 if (device_create_file(&bci->ac->dev, &dev_attr_mode))
1087 dev_warn(&pdev->dev, "could not create sysfs file\n");
1088 if (device_create_file(&bci->ac->dev, &dev_attr_max_current))
1089 dev_warn(&pdev->dev, "could not create sysfs file\n");
1090
1091 twl4030_charger_enable_ac(bci, true);
1092 if (!IS_ERR_OR_NULL(bci->transceiver))
1093 twl4030_bci_usb_ncb(&bci->usb_nb,
1094 bci->transceiver->last_event,
1095 NULL);
1096 else
1097 twl4030_charger_enable_usb(bci, false);
1098 if (pdata)
1099 twl4030_charger_enable_backup(pdata->bb_uvolt,
1100 pdata->bb_uamp);
1101 else
1102 twl4030_charger_enable_backup(0, 0);
1103
1104 return 0;
1105 }
1106
1107 static int __exit twl4030_bci_remove(struct platform_device *pdev)
1108 {
1109 struct twl4030_bci *bci = platform_get_drvdata(pdev);
1110
1111 twl4030_charger_enable_ac(bci, false);
1112 twl4030_charger_enable_usb(bci, false);
1113 twl4030_charger_enable_backup(0, 0);
1114
1115 device_remove_file(&bci->usb->dev, &dev_attr_max_current);
1116 device_remove_file(&bci->usb->dev, &dev_attr_mode);
1117 device_remove_file(&bci->ac->dev, &dev_attr_max_current);
1118 device_remove_file(&bci->ac->dev, &dev_attr_mode);
1119 /* mask interrupts */
1120 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
1121 TWL4030_INTERRUPTS_BCIIMR1A);
1122 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
1123 TWL4030_INTERRUPTS_BCIIMR2A);
1124
1125 return 0;
1126 }
1127
1128 static const struct of_device_id twl_bci_of_match[] = {
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 .driver = {
1137 .name = "twl4030_bci",
1138 .of_match_table = of_match_ptr(twl_bci_of_match),
1139 },
1140 .remove = __exit_p(twl4030_bci_remove),
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");
Linux kernel - Deliverables
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