9fad387e50817784b1acf80ca794fe27d1f9d780
[muen/linux.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/i2c/twl.h>
22 #include <linux/power_supply.h>
23 #include <linux/notifier.h>
24 #include <linux/usb/otg.h>
25 #include <linux/iio/consumer.h>
26
27 #define TWL4030_BCIMDEN         0x00
28 #define TWL4030_BCIMDKEY        0x01
29 #define TWL4030_BCIMSTATEC      0x02
30 #define TWL4030_BCIICHG         0x08
31 #define TWL4030_BCIVAC          0x0a
32 #define TWL4030_BCIVBUS         0x0c
33 #define TWL4030_BCIMFSTS3       0x0F
34 #define TWL4030_BCIMFSTS4       0x10
35 #define TWL4030_BCICTL1         0x23
36 #define TWL4030_BB_CFG          0x12
37 #define TWL4030_BCIIREF1        0x27
38 #define TWL4030_BCIIREF2        0x28
39 #define TWL4030_BCIMFKEY        0x11
40 #define TWL4030_BCIMFEN3        0x14
41 #define TWL4030_BCIMFTH8        0x1d
42 #define TWL4030_BCIMFTH9        0x1e
43 #define TWL4030_BCIWDKEY        0x21
44
45 #define TWL4030_BCIMFSTS1       0x01
46
47 #define TWL4030_BCIAUTOWEN      BIT(5)
48 #define TWL4030_CONFIG_DONE     BIT(4)
49 #define TWL4030_CVENAC          BIT(2)
50 #define TWL4030_BCIAUTOUSB      BIT(1)
51 #define TWL4030_BCIAUTOAC       BIT(0)
52 #define TWL4030_CGAIN           BIT(5)
53 #define TWL4030_USBFASTMCHG     BIT(2)
54 #define TWL4030_STS_VBUS        BIT(7)
55 #define TWL4030_STS_USB_ID      BIT(2)
56 #define TWL4030_BBCHEN          BIT(4)
57 #define TWL4030_BBSEL_MASK      0x0c
58 #define TWL4030_BBSEL_2V5       0x00
59 #define TWL4030_BBSEL_3V0       0x04
60 #define TWL4030_BBSEL_3V1       0x08
61 #define TWL4030_BBSEL_3V2       0x0c
62 #define TWL4030_BBISEL_MASK     0x03
63 #define TWL4030_BBISEL_25uA     0x00
64 #define TWL4030_BBISEL_150uA    0x01
65 #define TWL4030_BBISEL_500uA    0x02
66 #define TWL4030_BBISEL_1000uA   0x03
67
68 #define TWL4030_BATSTSPCHG      BIT(2)
69 #define TWL4030_BATSTSMCHG      BIT(6)
70
71 /* BCI interrupts */
72 #define TWL4030_WOVF            BIT(0) /* Watchdog overflow */
73 #define TWL4030_TMOVF           BIT(1) /* Timer overflow */
74 #define TWL4030_ICHGHIGH        BIT(2) /* Battery charge current high */
75 #define TWL4030_ICHGLOW         BIT(3) /* Battery cc. low / FSM state change */
76 #define TWL4030_ICHGEOC         BIT(4) /* Battery current end-of-charge */
77 #define TWL4030_TBATOR2         BIT(5) /* Battery temperature out of range 2 */
78 #define TWL4030_TBATOR1         BIT(6) /* Battery temperature out of range 1 */
79 #define TWL4030_BATSTS          BIT(7) /* Battery status */
80
81 #define TWL4030_VBATLVL         BIT(0) /* VBAT level */
82 #define TWL4030_VBATOV          BIT(1) /* VBAT overvoltage */
83 #define TWL4030_VBUSOV          BIT(2) /* VBUS overvoltage */
84 #define TWL4030_ACCHGOV         BIT(3) /* Ac charger overvoltage */
85
86 #define TWL4030_MSTATEC_USB             BIT(4)
87 #define TWL4030_MSTATEC_AC              BIT(5)
88 #define TWL4030_MSTATEC_MASK            0x0f
89 #define TWL4030_MSTATEC_QUICK1          0x02
90 #define TWL4030_MSTATEC_QUICK7          0x07
91 #define TWL4030_MSTATEC_COMPLETE1       0x0b
92 #define TWL4030_MSTATEC_COMPLETE4       0x0e
93
94 /*
95  * If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11)
96  * then AC is available.
97  */
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                 bci->usb_cur -= USB_CUR_STEP;
424                 bci->usb_cur_target = bci->usb_cur;
425         } else if (bci->usb_cur >= bci->usb_cur_target ||
426                    bci->usb_cur + USB_CUR_STEP > USB_MAX_CURRENT) {
427                 /* Reached target and voltage is OK - stop */
428                 return;
429         } else {
430                 bci->usb_cur += USB_CUR_STEP;
431                 schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY);
432         }
433         twl4030_charger_update_current(bci);
434 }
435
436 /*
437  * Enable/Disable USB Charge functionality.
438  */
439 static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
440 {
441         int ret;
442
443         if (bci->usb_mode == CHARGE_OFF)
444                 enable = false;
445         if (enable && !IS_ERR_OR_NULL(bci->transceiver)) {
446
447                 twl4030_charger_update_current(bci);
448
449                 /* Need to keep phy powered */
450                 if (!bci->usb_enabled) {
451                         pm_runtime_get_sync(bci->transceiver->dev);
452                         bci->usb_enabled = 1;
453                 }
454
455                 if (bci->usb_mode == CHARGE_AUTO)
456                         /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
457                         ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
458
459                 /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
460                 ret = twl4030_clear_set(TWL_MODULE_MAIN_CHARGE, 0,
461                         TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
462                 if (bci->usb_mode == CHARGE_LINEAR) {
463                         twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC|TWL4030_CVENAC, 0);
464                         /* Watch dog key: WOVF acknowledge */
465                         ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x33,
466                                                TWL4030_BCIWDKEY);
467                         /* 0x24 + EKEY6: off mode */
468                         ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a,
469                                                TWL4030_BCIMDKEY);
470                         /* EKEY2: Linear charge: USB path */
471                         ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x26,
472                                                TWL4030_BCIMDKEY);
473                         /* WDKEY5: stop watchdog count */
474                         ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf3,
475                                                TWL4030_BCIWDKEY);
476                         /* enable MFEN3 access */
477                         ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x9c,
478                                                TWL4030_BCIMFKEY);
479                          /* ICHGEOCEN - end-of-charge monitor (current < 80mA)
480                           *                      (charging continues)
481                           * ICHGLOWEN - current level monitor (charge continues)
482                           * don't monitor over-current or heat save
483                           */
484                         ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf0,
485                                                TWL4030_BCIMFEN3);
486                 }
487         } else {
488                 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
489                 ret |= twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a,
490                                         TWL4030_BCIMDKEY);
491                 if (bci->usb_enabled) {
492                         pm_runtime_mark_last_busy(bci->transceiver->dev);
493                         pm_runtime_put_autosuspend(bci->transceiver->dev);
494                         bci->usb_enabled = 0;
495                 }
496                 bci->usb_cur = 0;
497         }
498
499         return ret;
500 }
501
502 /*
503  * Enable/Disable AC Charge funtionality.
504  */
505 static int twl4030_charger_enable_ac(struct twl4030_bci *bci, bool enable)
506 {
507         int ret;
508
509         if (bci->ac_mode == CHARGE_OFF)
510                 enable = false;
511
512         if (enable)
513                 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
514         else
515                 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
516
517         return ret;
518 }
519
520 /*
521  * Enable/Disable charging of Backup Battery.
522  */
523 static int twl4030_charger_enable_backup(int uvolt, int uamp)
524 {
525         int ret;
526         u8 flags;
527
528         if (uvolt < 2500000 ||
529             uamp < 25) {
530                 /* disable charging of backup battery */
531                 ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
532                                         TWL4030_BBCHEN, 0, TWL4030_BB_CFG);
533                 return ret;
534         }
535
536         flags = TWL4030_BBCHEN;
537         if (uvolt >= 3200000)
538                 flags |= TWL4030_BBSEL_3V2;
539         else if (uvolt >= 3100000)
540                 flags |= TWL4030_BBSEL_3V1;
541         else if (uvolt >= 3000000)
542                 flags |= TWL4030_BBSEL_3V0;
543         else
544                 flags |= TWL4030_BBSEL_2V5;
545
546         if (uamp >= 1000)
547                 flags |= TWL4030_BBISEL_1000uA;
548         else if (uamp >= 500)
549                 flags |= TWL4030_BBISEL_500uA;
550         else if (uamp >= 150)
551                 flags |= TWL4030_BBISEL_150uA;
552         else
553                 flags |= TWL4030_BBISEL_25uA;
554
555         ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
556                                 TWL4030_BBSEL_MASK | TWL4030_BBISEL_MASK,
557                                 flags,
558                                 TWL4030_BB_CFG);
559
560         return ret;
561 }
562
563 /*
564  * TWL4030 CHG_PRES (AC charger presence) events
565  */
566 static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
567 {
568         struct twl4030_bci *bci = arg;
569
570         dev_dbg(bci->dev, "CHG_PRES irq\n");
571         /* reset current on each 'plug' event */
572         bci->ac_cur = 500000;
573         twl4030_charger_update_current(bci);
574         power_supply_changed(bci->ac);
575         power_supply_changed(bci->usb);
576
577         return IRQ_HANDLED;
578 }
579
580 /*
581  * TWL4030 BCI monitoring events
582  */
583 static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
584 {
585         struct twl4030_bci *bci = arg;
586         u8 irqs1, irqs2;
587         int ret;
588
589         ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
590                               TWL4030_INTERRUPTS_BCIISR1A);
591         if (ret < 0)
592                 return IRQ_HANDLED;
593
594         ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
595                               TWL4030_INTERRUPTS_BCIISR2A);
596         if (ret < 0)
597                 return IRQ_HANDLED;
598
599         dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);
600
601         if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) {
602                 /* charger state change, inform the core */
603                 power_supply_changed(bci->ac);
604                 power_supply_changed(bci->usb);
605         }
606         twl4030_charger_update_current(bci);
607
608         /* various monitoring events, for now we just log them here */
609         if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1))
610                 dev_warn(bci->dev, "battery temperature out of range\n");
611
612         if (irqs1 & TWL4030_BATSTS)
613                 dev_crit(bci->dev, "battery disconnected\n");
614
615         if (irqs2 & TWL4030_VBATOV)
616                 dev_crit(bci->dev, "VBAT overvoltage\n");
617
618         if (irqs2 & TWL4030_VBUSOV)
619                 dev_crit(bci->dev, "VBUS overvoltage\n");
620
621         if (irqs2 & TWL4030_ACCHGOV)
622                 dev_crit(bci->dev, "Ac charger overvoltage\n");
623
624         return IRQ_HANDLED;
625 }
626
627 static void twl4030_bci_usb_work(struct work_struct *data)
628 {
629         struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
630
631         switch (bci->event) {
632         case USB_EVENT_VBUS:
633         case USB_EVENT_CHARGER:
634                 twl4030_charger_enable_usb(bci, true);
635                 break;
636         case USB_EVENT_NONE:
637                 twl4030_charger_enable_usb(bci, false);
638                 break;
639         }
640 }
641
642 static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
643                                void *priv)
644 {
645         struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb);
646
647         dev_dbg(bci->dev, "OTG notify %lu\n", val);
648
649         /* reset current on each 'plug' event */
650         if (allow_usb)
651                 bci->usb_cur_target = 500000;
652         else
653                 bci->usb_cur_target = 100000;
654
655         bci->event = val;
656         schedule_work(&bci->work);
657
658         return NOTIFY_OK;
659 }
660
661 /*
662  * sysfs charger enabled store
663  */
664 static ssize_t
665 twl4030_bci_mode_store(struct device *dev, struct device_attribute *attr,
666                           const char *buf, size_t n)
667 {
668         struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
669         int mode;
670         int status;
671
672         mode = sysfs_match_string(modes, buf);
673         if (mode < 0)
674                 return mode;
675
676         if (dev == &bci->ac->dev) {
677                 if (mode == 2)
678                         return -EINVAL;
679                 twl4030_charger_enable_ac(bci, false);
680                 bci->ac_mode = mode;
681                 status = twl4030_charger_enable_ac(bci, true);
682         } else {
683                 twl4030_charger_enable_usb(bci, false);
684                 bci->usb_mode = mode;
685                 status = twl4030_charger_enable_usb(bci, true);
686         }
687         return (status == 0) ? n : status;
688 }
689
690 /*
691  * sysfs charger enabled show
692  */
693 static ssize_t
694 twl4030_bci_mode_show(struct device *dev,
695                              struct device_attribute *attr, char *buf)
696 {
697         struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
698         int len = 0;
699         int i;
700         int mode = bci->usb_mode;
701
702         if (dev == &bci->ac->dev)
703                 mode = bci->ac_mode;
704
705         for (i = 0; i < ARRAY_SIZE(modes); i++)
706                 if (mode == i)
707                         len += snprintf(buf+len, PAGE_SIZE-len,
708                                         "[%s] ", modes[i]);
709                 else
710                         len += snprintf(buf+len, PAGE_SIZE-len,
711                                         "%s ", modes[i]);
712         buf[len-1] = '\n';
713         return len;
714 }
715 static DEVICE_ATTR(mode, 0644, twl4030_bci_mode_show,
716                    twl4030_bci_mode_store);
717
718 static int twl4030_charger_get_current(void)
719 {
720         int curr;
721         int ret;
722         u8 bcictl1;
723
724         curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
725         if (curr < 0)
726                 return curr;
727
728         ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
729         if (ret)
730                 return ret;
731
732         return regval2ua(curr, bcictl1 & TWL4030_CGAIN);
733 }
734
735 /*
736  * Returns the main charge FSM state
737  * Or < 0 on failure.
738  */
739 static int twl4030bci_state(struct twl4030_bci *bci)
740 {
741         int ret;
742         u8 state;
743
744         ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
745         if (ret) {
746                 pr_err("twl4030_bci: error reading BCIMSTATEC\n");
747                 return ret;
748         }
749
750         dev_dbg(bci->dev, "state: %02x\n", state);
751
752         return state;
753 }
754
755 static int twl4030_bci_state_to_status(int state)
756 {
757         state &= TWL4030_MSTATEC_MASK;
758         if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
759                 return POWER_SUPPLY_STATUS_CHARGING;
760         else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
761                                         state <= TWL4030_MSTATEC_COMPLETE4)
762                 return POWER_SUPPLY_STATUS_FULL;
763         else
764                 return POWER_SUPPLY_STATUS_NOT_CHARGING;
765 }
766
767 static int twl4030_bci_get_property(struct power_supply *psy,
768                                     enum power_supply_property psp,
769                                     union power_supply_propval *val)
770 {
771         struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent);
772         int is_charging;
773         int state;
774         int ret;
775
776         state = twl4030bci_state(bci);
777         if (state < 0)
778                 return state;
779
780         if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
781                 is_charging = state & TWL4030_MSTATEC_USB;
782         else
783                 is_charging = state & TWL4030_MSTATEC_AC;
784         if (!is_charging) {
785                 u8 s;
786                 twl4030_bci_read(TWL4030_BCIMDEN, &s);
787                 if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
788                         is_charging = s & 1;
789                 else
790                         is_charging = s & 2;
791                 if (is_charging)
792                         /* A little white lie */
793                         state = TWL4030_MSTATEC_QUICK1;
794         }
795
796         switch (psp) {
797         case POWER_SUPPLY_PROP_STATUS:
798                 if (is_charging)
799                         val->intval = twl4030_bci_state_to_status(state);
800                 else
801                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
802                 break;
803         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
804                 /* charging must be active for meaningful result */
805                 if (!is_charging)
806                         return -ENODATA;
807                 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) {
808                         ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
809                         if (ret < 0)
810                                 return ret;
811                         /* BCIVBUS uses ADCIN8, 7/1023 V/step */
812                         val->intval = ret * 6843;
813                 } else {
814                         ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
815                         if (ret < 0)
816                                 return ret;
817                         /* BCIVAC uses ADCIN11, 10/1023 V/step */
818                         val->intval = ret * 9775;
819                 }
820                 break;
821         case POWER_SUPPLY_PROP_CURRENT_NOW:
822                 if (!is_charging)
823                         return -ENODATA;
824                 /* current measurement is shared between AC and USB */
825                 ret = twl4030_charger_get_current();
826                 if (ret < 0)
827                         return ret;
828                 val->intval = ret;
829                 break;
830         case POWER_SUPPLY_PROP_ONLINE:
831                 val->intval = is_charging &&
832                         twl4030_bci_state_to_status(state) !=
833                                 POWER_SUPPLY_STATUS_NOT_CHARGING;
834                 break;
835         case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
836                 val->intval = -1;
837                 if (psy->desc->type != POWER_SUPPLY_TYPE_USB) {
838                         if (!bci->ac_is_active)
839                                 val->intval = bci->ac_cur;
840                 } else {
841                         if (bci->ac_is_active)
842                                 val->intval = bci->usb_cur_target;
843                 }
844                 if (val->intval < 0) {
845                         u8 bcictl1;
846
847                         val->intval = twl4030bci_read_adc_val(TWL4030_BCIIREF1);
848                         if (val->intval < 0)
849                                 return val->intval;
850                         ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
851                         if (ret < 0)
852                                 return ret;
853                         val->intval = regval2ua(val->intval, bcictl1 &
854                                                         TWL4030_CGAIN);
855                 }
856                 break;
857         default:
858                 return -EINVAL;
859         }
860
861         return 0;
862 }
863
864 static int twl4030_bci_set_property(struct power_supply *psy,
865                                     enum power_supply_property psp,
866                                     const union power_supply_propval *val)
867 {
868         struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent);
869
870         switch (psp) {
871         case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
872                 if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
873                         bci->usb_cur_target = val->intval;
874                 else
875                         bci->ac_cur = val->intval;
876                 twl4030_charger_update_current(bci);
877                 break;
878         default:
879                 return -EINVAL;
880         }
881
882         return 0;
883 }
884
885 static int twl4030_bci_property_is_writeable(struct power_supply *psy,
886                                       enum power_supply_property psp)
887 {
888         switch (psp) {
889         case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
890                 return true;
891         default:
892                 return false;
893         }
894 }
895
896 static enum power_supply_property twl4030_charger_props[] = {
897         POWER_SUPPLY_PROP_STATUS,
898         POWER_SUPPLY_PROP_ONLINE,
899         POWER_SUPPLY_PROP_VOLTAGE_NOW,
900         POWER_SUPPLY_PROP_CURRENT_NOW,
901         POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
902 };
903
904 #ifdef CONFIG_OF
905 static const struct twl4030_bci_platform_data *
906 twl4030_bci_parse_dt(struct device *dev)
907 {
908         struct device_node *np = dev->of_node;
909         struct twl4030_bci_platform_data *pdata;
910         u32 num;
911
912         if (!np)
913                 return NULL;
914         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
915         if (!pdata)
916                 return pdata;
917
918         if (of_property_read_u32(np, "ti,bb-uvolt", &num) == 0)
919                 pdata->bb_uvolt = num;
920         if (of_property_read_u32(np, "ti,bb-uamp", &num) == 0)
921                 pdata->bb_uamp = num;
922         return pdata;
923 }
924 #else
925 static inline const struct twl4030_bci_platform_data *
926 twl4030_bci_parse_dt(struct device *dev)
927 {
928         return NULL;
929 }
930 #endif
931
932 static const struct power_supply_desc twl4030_bci_ac_desc = {
933         .name           = "twl4030_ac",
934         .type           = POWER_SUPPLY_TYPE_MAINS,
935         .properties     = twl4030_charger_props,
936         .num_properties = ARRAY_SIZE(twl4030_charger_props),
937         .get_property   = twl4030_bci_get_property,
938         .set_property   = twl4030_bci_set_property,
939         .property_is_writeable  = twl4030_bci_property_is_writeable,
940 };
941
942 static const struct power_supply_desc twl4030_bci_usb_desc = {
943         .name           = "twl4030_usb",
944         .type           = POWER_SUPPLY_TYPE_USB,
945         .properties     = twl4030_charger_props,
946         .num_properties = ARRAY_SIZE(twl4030_charger_props),
947         .get_property   = twl4030_bci_get_property,
948         .set_property   = twl4030_bci_set_property,
949         .property_is_writeable  = twl4030_bci_property_is_writeable,
950 };
951
952 static int twl4030_bci_probe(struct platform_device *pdev)
953 {
954         struct twl4030_bci *bci;
955         const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;
956         int ret;
957         u32 reg;
958
959         bci = devm_kzalloc(&pdev->dev, sizeof(*bci), GFP_KERNEL);
960         if (bci == NULL)
961                 return -ENOMEM;
962
963         if (!pdata)
964                 pdata = twl4030_bci_parse_dt(&pdev->dev);
965
966         bci->ichg_eoc = 80100; /* Stop charging when current drops to here */
967         bci->ichg_lo = 241000; /* Low threshold */
968         bci->ichg_hi = 500000; /* High threshold */
969         bci->ac_cur = 500000; /* 500mA */
970         if (allow_usb)
971                 bci->usb_cur_target = 500000;  /* 500mA */
972         else
973                 bci->usb_cur_target = 100000;  /* 100mA */
974         bci->usb_mode = CHARGE_AUTO;
975         bci->ac_mode = CHARGE_AUTO;
976
977         bci->dev = &pdev->dev;
978         bci->irq_chg = platform_get_irq(pdev, 0);
979         bci->irq_bci = platform_get_irq(pdev, 1);
980
981         platform_set_drvdata(pdev, bci);
982
983         INIT_WORK(&bci->work, twl4030_bci_usb_work);
984         INIT_DELAYED_WORK(&bci->current_worker, twl4030_current_worker);
985
986         bci->channel_vac = devm_iio_channel_get(&pdev->dev, "vac");
987         if (IS_ERR(bci->channel_vac)) {
988                 bci->channel_vac = NULL;
989                 dev_warn(&pdev->dev, "could not request vac iio channel");
990         }
991
992         if (bci->dev->of_node) {
993                 struct device_node *phynode;
994
995                 phynode = of_find_compatible_node(bci->dev->of_node->parent,
996                                                   NULL, "ti,twl4030-usb");
997                 if (phynode) {
998                         bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
999                         bci->transceiver = devm_usb_get_phy_by_node(
1000                                 bci->dev, phynode, &bci->usb_nb);
1001                 }
1002         }
1003
1004         bci->ac = devm_power_supply_register(&pdev->dev, &twl4030_bci_ac_desc,
1005                                              NULL);
1006         if (IS_ERR(bci->ac)) {
1007                 ret = PTR_ERR(bci->ac);
1008                 dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
1009                 return ret;
1010         }
1011
1012         bci->usb = devm_power_supply_register(&pdev->dev, &twl4030_bci_usb_desc,
1013                                               NULL);
1014         if (IS_ERR(bci->usb)) {
1015                 ret = PTR_ERR(bci->usb);
1016                 dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
1017                 return ret;
1018         }
1019
1020         ret = devm_request_threaded_irq(&pdev->dev, bci->irq_chg, NULL,
1021                         twl4030_charger_interrupt, IRQF_ONESHOT, pdev->name,
1022                         bci);
1023         if (ret < 0) {
1024                 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
1025                         bci->irq_chg, ret);
1026                 return ret;
1027         }
1028
1029         ret = devm_request_threaded_irq(&pdev->dev, bci->irq_bci, NULL,
1030                         twl4030_bci_interrupt, IRQF_ONESHOT, pdev->name, bci);
1031         if (ret < 0) {
1032                 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
1033                         bci->irq_bci, ret);
1034                 return ret;
1035         }
1036
1037         /* Enable interrupts now. */
1038         reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 |
1039                 TWL4030_TBATOR1 | TWL4030_BATSTS);
1040         ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
1041                                TWL4030_INTERRUPTS_BCIIMR1A);
1042         if (ret < 0) {
1043                 dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
1044                 return ret;
1045         }
1046
1047         reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV);
1048         ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
1049                                TWL4030_INTERRUPTS_BCIIMR2A);
1050         if (ret < 0)
1051                 dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
1052
1053         twl4030_charger_update_current(bci);
1054         if (device_create_file(&bci->usb->dev, &dev_attr_mode))
1055                 dev_warn(&pdev->dev, "could not create sysfs file\n");
1056         if (device_create_file(&bci->ac->dev, &dev_attr_mode))
1057                 dev_warn(&pdev->dev, "could not create sysfs file\n");
1058
1059         twl4030_charger_enable_ac(bci, true);
1060         if (!IS_ERR_OR_NULL(bci->transceiver))
1061                 twl4030_bci_usb_ncb(&bci->usb_nb,
1062                                     bci->transceiver->last_event,
1063                                     NULL);
1064         else
1065                 twl4030_charger_enable_usb(bci, false);
1066         if (pdata)
1067                 twl4030_charger_enable_backup(pdata->bb_uvolt,
1068                                               pdata->bb_uamp);
1069         else
1070                 twl4030_charger_enable_backup(0, 0);
1071
1072         return 0;
1073 }
1074
1075 static int twl4030_bci_remove(struct platform_device *pdev)
1076 {
1077         struct twl4030_bci *bci = platform_get_drvdata(pdev);
1078
1079         twl4030_charger_enable_ac(bci, false);
1080         twl4030_charger_enable_usb(bci, false);
1081         twl4030_charger_enable_backup(0, 0);
1082
1083         device_remove_file(&bci->usb->dev, &dev_attr_mode);
1084         device_remove_file(&bci->ac->dev, &dev_attr_mode);
1085         /* mask interrupts */
1086         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
1087                          TWL4030_INTERRUPTS_BCIIMR1A);
1088         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
1089                          TWL4030_INTERRUPTS_BCIIMR2A);
1090
1091         return 0;
1092 }
1093
1094 static const struct of_device_id twl_bci_of_match[] = {
1095         {.compatible = "ti,twl4030-bci", },
1096         { }
1097 };
1098 MODULE_DEVICE_TABLE(of, twl_bci_of_match);
1099
1100 static struct platform_driver twl4030_bci_driver = {
1101         .probe = twl4030_bci_probe,
1102         .remove = twl4030_bci_remove,
1103         .driver = {
1104                 .name   = "twl4030_bci",
1105                 .of_match_table = of_match_ptr(twl_bci_of_match),
1106         },
1107 };
1108 module_platform_driver(twl4030_bci_driver);
1109
1110 MODULE_AUTHOR("Gražvydas Ignotas");
1111 MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
1112 MODULE_LICENSE("GPL");
1113 MODULE_ALIAS("platform:twl4030_bci");