2 * TWL4030/TPS65950 BCI (Battery Charger Interface) driver
4 * Copyright (C) 2010 Gražvydas Ignotas <notasas@gmail.com>
6 * based on twl4030_bci_battery.c by TI
7 * Copyright (C) 2008 Texas Instruments, Inc.
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.
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>
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
45 #define TWL4030_BCIMFSTS1 0x01
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
68 #define TWL4030_BATSTSPCHG BIT(2)
69 #define TWL4030_BATSTSMCHG BIT(6)
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 */
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 */
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
94 #if IS_REACHABLE(CONFIG_TWL4030_MADC)
96 * If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11)
97 * then AC is available.
99 static inline int ac_available(void)
101 return twl4030_get_madc_conversion(11) > 4500;
104 static inline int ac_available(void)
109 static bool allow_usb;
110 module_param(allow_usb, bool, 0644);
111 MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");
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;
125 * ichg_* and *_cur values in uA. If any are 'large', we set
126 * CGAIN to '1' which doubles the range for half the
129 unsigned int ichg_eoc, ichg_lo, ichg_hi;
130 unsigned int usb_cur, ac_cur;
132 int usb_mode, ac_mode; /* charging mode requested */
134 #define CHARGE_AUTO 1
135 #define CHARGE_LINEAR 2
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
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 */
152 /* strings for 'usb_mode' values */
153 static char *modes[] = { "off", "auto", "continuous" };
156 * clear and set bits on an given register on a given module
158 static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg)
163 ret = twl_i2c_read_u8(mod_no, &val, reg);
170 return twl_i2c_write_u8(mod_no, val, reg);
173 static int twl4030_bci_read(u8 reg, u8 *val)
175 return twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, val, reg);
178 static int twl4030_clear_set_boot_bci(u8 clear, u8 set)
180 return twl4030_clear_set(TWL_MODULE_PM_MASTER, clear,
181 TWL4030_CONFIG_DONE | TWL4030_BCIAUTOWEN | set,
182 TWL4030_PM_MASTER_BOOT_BCI);
185 static int twl4030bci_read_adc_val(u8 reg)
191 ret = twl4030_bci_read(reg + 1, &val);
195 temp = (int)(val & 0x03) << 8;
198 ret = twl4030_bci_read(reg, &val);
206 * Check if Battery Pack was present
208 static int twl4030_is_battery_present(struct twl4030_bci *bci)
213 /* Battery presence in Main charge? */
214 ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, &val, TWL4030_BCIMFSTS3);
217 if (val & TWL4030_BATSTSMCHG)
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?
224 ret = twl_i2c_read_u8(TWL4030_MODULE_PRECHARGE, &val,
228 if (val & TWL4030_BATSTSPCHG)
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
243 * convert twl register value for currents into uA
245 static int regval2ua(int regval, bool cgain)
248 return (regval * 16618 - 8500 * 1000) / 5;
250 return (regval * 16618 - 8500 * 1000) / 10;
254 * convert uA currents into twl register value
256 static int ua2regval(int ua, bool cgain)
261 ret = (ua * 10 + 8500 * 1000) / 16618;
262 /* rounding problems */
268 static int twl4030_charger_update_current(struct twl4030_bci *bci)
272 unsigned reg, cur_reg;
273 u8 bcictl1, oldreg, fullreg;
278 * If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11)
279 * and AC is enabled, set current for 'ac'
281 if (ac_available()) {
283 bci->ac_is_active = true;
286 bci->ac_is_active = false;
287 if (cur > bci->usb_cur_target) {
288 cur = bci->usb_cur_target;
291 if (cur < bci->usb_cur_target)
292 schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY);
295 /* First, check thresholds and see if cgain is needed */
296 if (bci->ichg_eoc >= 200000)
298 if (bci->ichg_lo >= 400000)
300 if (bci->ichg_hi >= 820000)
305 status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
308 if (twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &boot_bci,
309 TWL4030_PM_MASTER_BOOT_BCI) < 0)
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
318 twl4030_clear_set_boot_bci(boot_bci, 0);
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.
325 reg = ua2regval(bci->ichg_eoc, cgain);
330 reg = (reg >> 3) & 0xf;
334 * For ichg_lo, reg value must match 10XXXX0000.
335 * XXXX is stored in low nibble of TWL4030_BCIMFTH8.
337 reg = ua2regval(bci->ichg_lo, cgain);
342 reg = (reg >> 4) & 0xf;
345 /* ichg_eoc and ichg_lo live in same register */
346 status = twl4030_bci_read(TWL4030_BCIMFTH8, &oldreg);
349 if (oldreg != fullreg) {
350 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xF4,
354 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
355 fullreg, TWL4030_BCIMFTH8);
358 /* ichg_hi threshold must be 1XXXX01100 (I think) */
359 reg = ua2regval(bci->ichg_hi, cgain);
364 fullreg = (reg >> 5) & 0xF;
366 status = twl4030_bci_read(TWL4030_BCIMFTH9, &oldreg);
369 if ((oldreg & 0xF0) != fullreg) {
370 fullreg |= (oldreg & 0x0F);
371 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
375 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
376 fullreg, TWL4030_BCIMFTH9);
380 * And finally, set the current. This is stored in
383 reg = ua2regval(cur, cgain);
384 /* we have only 10 bits */
387 status = twl4030_bci_read(TWL4030_BCIIREF1, &oldreg);
391 status = twl4030_bci_read(TWL4030_BCIIREF2, &oldreg);
394 cur_reg |= oldreg << 8;
396 /* disable write protection for one write access for
398 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
402 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
403 (reg & 0x100) ? 3 : 2,
407 /* disable write protection for one write access for
409 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
413 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
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);
427 static int twl4030_charger_get_current(void);
429 static void twl4030_current_worker(struct work_struct *data)
433 struct twl4030_bci *bci = container_of(data, struct twl4030_bci,
434 current_worker.work);
436 res = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
440 /* BCIVBUS uses ADCIN8, 7/1023 V/step */
442 curr = twl4030_charger_get_current();
444 dev_dbg(bci->dev, "v=%d cur=%d limit=%d target=%d\n", v, curr,
445 bci->usb_cur, bci->usb_cur_target);
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 */
456 bci->usb_cur += USB_CUR_STEP;
457 schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY);
459 twl4030_charger_update_current(bci);
463 * Enable/Disable USB Charge functionality.
465 static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
469 if (bci->usb_mode == CHARGE_OFF)
471 if (enable && !IS_ERR_OR_NULL(bci->transceiver)) {
473 twl4030_charger_update_current(bci);
475 /* Need to keep phy powered */
476 if (!bci->usb_enabled) {
477 pm_runtime_get_sync(bci->transceiver->dev);
478 bci->usb_enabled = 1;
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);
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,
493 /* 0x24 + EKEY6: off mode */
494 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a,
496 /* EKEY2: Linear charge: USB path */
497 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x26,
499 /* WDKEY5: stop watchdog count */
500 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf3,
502 /* enable MFEN3 access */
503 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x9c,
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
510 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf0,
514 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
515 ret |= twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a,
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;
529 * Enable/Disable AC Charge funtionality.
531 static int twl4030_charger_enable_ac(struct twl4030_bci *bci, bool enable)
535 if (bci->ac_mode == CHARGE_OFF)
539 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
541 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
547 * Enable/Disable charging of Backup Battery.
549 static int twl4030_charger_enable_backup(int uvolt, int uamp)
554 if (uvolt < 2500000 ||
556 /* disable charging of backup battery */
557 ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
558 TWL4030_BBCHEN, 0, TWL4030_BB_CFG);
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;
570 flags |= TWL4030_BBSEL_2V5;
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;
579 flags |= TWL4030_BBISEL_25uA;
581 ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
582 TWL4030_BBSEL_MASK | TWL4030_BBISEL_MASK,
590 * TWL4030 CHG_PRES (AC charger presence) events
592 static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
594 struct twl4030_bci *bci = arg;
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);
607 * TWL4030 BCI monitoring events
609 static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
611 struct twl4030_bci *bci = arg;
615 ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
616 TWL4030_INTERRUPTS_BCIISR1A);
620 ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
621 TWL4030_INTERRUPTS_BCIISR2A);
625 dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);
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);
632 twl4030_charger_update_current(bci);
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");
638 if (irqs1 & TWL4030_BATSTS)
639 dev_crit(bci->dev, "battery disconnected\n");
641 if (irqs2 & TWL4030_VBATOV)
642 dev_crit(bci->dev, "VBAT overvoltage\n");
644 if (irqs2 & TWL4030_VBUSOV)
645 dev_crit(bci->dev, "VBUS overvoltage\n");
647 if (irqs2 & TWL4030_ACCHGOV)
648 dev_crit(bci->dev, "Ac charger overvoltage\n");
654 * Provide "max_current" attribute in sysfs.
657 twl4030_bci_max_current_store(struct device *dev, struct device_attribute *attr,
658 const char *buf, size_t n)
660 struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
663 status = kstrtoint(buf, 10, &cur);
668 if (dev == &bci->ac->dev)
671 bci->usb_cur_target = cur;
673 twl4030_charger_update_current(bci);
678 * sysfs max_current show
680 static ssize_t twl4030_bci_max_current_show(struct device *dev,
681 struct device_attribute *attr, char *buf)
686 struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
688 if (dev == &bci->ac->dev) {
689 if (!bci->ac_is_active)
692 if (bci->ac_is_active)
693 cur = bci->usb_cur_target;
696 cur = twl4030bci_read_adc_val(TWL4030_BCIIREF1);
699 status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
702 cur = regval2ua(cur, bcictl1 & TWL4030_CGAIN);
704 return scnprintf(buf, PAGE_SIZE, "%u\n", cur);
707 static DEVICE_ATTR(max_current, 0644, twl4030_bci_max_current_show,
708 twl4030_bci_max_current_store);
710 static void twl4030_bci_usb_work(struct work_struct *data)
712 struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
714 switch (bci->event) {
716 case USB_EVENT_CHARGER:
717 twl4030_charger_enable_usb(bci, true);
720 twl4030_charger_enable_usb(bci, false);
725 static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
728 struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb);
730 dev_dbg(bci->dev, "OTG notify %lu\n", val);
732 /* reset current on each 'plug' event */
734 bci->usb_cur_target = 500000;
736 bci->usb_cur_target = 100000;
739 schedule_work(&bci->work);
745 * sysfs charger enabled store
748 twl4030_bci_mode_store(struct device *dev, struct device_attribute *attr,
749 const char *buf, size_t n)
751 struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
755 if (sysfs_streq(buf, modes[0]))
757 else if (sysfs_streq(buf, modes[1]))
759 else if (sysfs_streq(buf, modes[2]))
763 if (dev == &bci->ac->dev) {
766 twl4030_charger_enable_ac(bci, false);
768 status = twl4030_charger_enable_ac(bci, true);
770 twl4030_charger_enable_usb(bci, false);
771 bci->usb_mode = mode;
772 status = twl4030_charger_enable_usb(bci, true);
774 return (status == 0) ? n : status;
778 * sysfs charger enabled show
781 twl4030_bci_mode_show(struct device *dev,
782 struct device_attribute *attr, char *buf)
784 struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
787 int mode = bci->usb_mode;
789 if (dev == &bci->ac->dev)
792 for (i = 0; i < ARRAY_SIZE(modes); i++)
794 len += snprintf(buf+len, PAGE_SIZE-len,
797 len += snprintf(buf+len, PAGE_SIZE-len,
802 static DEVICE_ATTR(mode, 0644, twl4030_bci_mode_show,
803 twl4030_bci_mode_store);
805 static int twl4030_charger_get_current(void)
811 curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
815 ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
819 return regval2ua(curr, bcictl1 & TWL4030_CGAIN);
823 * Returns the main charge FSM state
826 static int twl4030bci_state(struct twl4030_bci *bci)
831 ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
833 pr_err("twl4030_bci: error reading BCIMSTATEC\n");
837 dev_dbg(bci->dev, "state: %02x\n", state);
842 static int twl4030_bci_state_to_status(int state)
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;
851 return POWER_SUPPLY_STATUS_NOT_CHARGING;
854 static int twl4030_bci_get_property(struct power_supply *psy,
855 enum power_supply_property psp,
856 union power_supply_propval *val)
858 struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent);
863 state = twl4030bci_state(bci);
867 if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
868 is_charging = state & TWL4030_MSTATEC_USB;
870 is_charging = state & TWL4030_MSTATEC_AC;
873 twl4030_bci_read(TWL4030_BCIMDEN, &s);
874 if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
879 /* A little white lie */
880 state = TWL4030_MSTATEC_QUICK1;
884 case POWER_SUPPLY_PROP_STATUS:
886 val->intval = twl4030_bci_state_to_status(state);
888 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
890 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
891 /* charging must be active for meaningful result */
894 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) {
895 ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
898 /* BCIVBUS uses ADCIN8, 7/1023 V/step */
899 val->intval = ret * 6843;
901 ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
904 /* BCIVAC uses ADCIN11, 10/1023 V/step */
905 val->intval = ret * 9775;
908 case POWER_SUPPLY_PROP_CURRENT_NOW:
911 /* current measurement is shared between AC and USB */
912 ret = twl4030_charger_get_current();
917 case POWER_SUPPLY_PROP_ONLINE:
918 val->intval = is_charging &&
919 twl4030_bci_state_to_status(state) !=
920 POWER_SUPPLY_STATUS_NOT_CHARGING;
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,
937 static const struct twl4030_bci_platform_data *
938 twl4030_bci_parse_dt(struct device *dev)
940 struct device_node *np = dev->of_node;
941 struct twl4030_bci_platform_data *pdata;
946 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
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;
957 static inline const struct twl4030_bci_platform_data *
958 twl4030_bci_parse_dt(struct device *dev)
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,
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,
980 static int twl4030_bci_probe(struct platform_device *pdev)
982 struct twl4030_bci *bci;
983 const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;
987 bci = devm_kzalloc(&pdev->dev, sizeof(*bci), GFP_KERNEL);
992 pdata = twl4030_bci_parse_dt(&pdev->dev);
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 */
999 bci->usb_cur_target = 500000; /* 500mA */
1001 bci->usb_cur_target = 100000; /* 100mA */
1002 bci->usb_mode = CHARGE_AUTO;
1003 bci->ac_mode = CHARGE_AUTO;
1005 bci->dev = &pdev->dev;
1006 bci->irq_chg = platform_get_irq(pdev, 0);
1007 bci->irq_bci = platform_get_irq(pdev, 1);
1009 /* Only proceed further *IF* battery is physically present */
1010 ret = twl4030_is_battery_present(bci);
1012 dev_crit(&pdev->dev, "Battery was not detected:%d\n", ret);
1016 platform_set_drvdata(pdev, bci);
1018 bci->ac = devm_power_supply_register(&pdev->dev, &twl4030_bci_ac_desc,
1020 if (IS_ERR(bci->ac)) {
1021 ret = PTR_ERR(bci->ac);
1022 dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
1026 bci->usb = devm_power_supply_register(&pdev->dev, &twl4030_bci_usb_desc,
1028 if (IS_ERR(bci->usb)) {
1029 ret = PTR_ERR(bci->usb);
1030 dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
1034 ret = devm_request_threaded_irq(&pdev->dev, bci->irq_chg, NULL,
1035 twl4030_charger_interrupt, IRQF_ONESHOT, pdev->name,
1038 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
1043 ret = devm_request_threaded_irq(&pdev->dev, bci->irq_bci, NULL,
1044 twl4030_bci_interrupt, IRQF_ONESHOT, pdev->name, bci);
1046 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
1051 INIT_WORK(&bci->work, twl4030_bci_usb_work);
1052 INIT_DELAYED_WORK(&bci->current_worker, twl4030_current_worker);
1054 bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
1055 if (bci->dev->of_node) {
1056 struct device_node *phynode;
1058 phynode = of_find_compatible_node(bci->dev->of_node->parent,
1059 NULL, "ti,twl4030-usb");
1061 bci->transceiver = devm_usb_get_phy_by_node(
1062 bci->dev, phynode, &bci->usb_nb);
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);
1071 dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
1075 reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV);
1076 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
1077 TWL4030_INTERRUPTS_BCIIMR2A);
1079 dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
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");
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,
1097 twl4030_charger_enable_usb(bci, false);
1099 twl4030_charger_enable_backup(pdata->bb_uvolt,
1102 twl4030_charger_enable_backup(0, 0);
1107 static int __exit twl4030_bci_remove(struct platform_device *pdev)
1109 struct twl4030_bci *bci = platform_get_drvdata(pdev);
1111 twl4030_charger_enable_ac(bci, false);
1112 twl4030_charger_enable_usb(bci, false);
1113 twl4030_charger_enable_backup(0, 0);
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);
1128 static const struct of_device_id twl_bci_of_match[] = {
1129 {.compatible = "ti,twl4030-bci", },
1132 MODULE_DEVICE_TABLE(of, twl_bci_of_match);
1134 static struct platform_driver twl4030_bci_driver = {
1135 .probe = twl4030_bci_probe,
1137 .name = "twl4030_bci",
1138 .of_match_table = of_match_ptr(twl_bci_of_match),
1140 .remove = __exit_p(twl4030_bci_remove),
1142 module_platform_driver(twl4030_bci_driver);
1144 MODULE_AUTHOR("Gražvydas Ignotas");
1145 MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
1146 MODULE_LICENSE("GPL");
1147 MODULE_ALIAS("platform:twl4030_bci");