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/mfd/twl.h>
22 #include <linux/power_supply.h>
23 #include <linux/notifier.h>
24 #include <linux/usb/otg.h>
25 #include <linux/iio/consumer.h>
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
95 * If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11)
96 * then AC is available.
98 static inline int ac_available(struct iio_channel *channel_vac)
105 err = iio_read_channel_processed(channel_vac, &val);
111 static bool allow_usb;
112 module_param(allow_usb, bool, 0644);
113 MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");
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;
127 * ichg_* and *_cur values in uA. If any are 'large', we set
128 * CGAIN to '1' which doubles the range for half the
131 unsigned int ichg_eoc, ichg_lo, ichg_hi;
132 unsigned int usb_cur, ac_cur;
133 struct iio_channel *channel_vac;
135 int usb_mode, ac_mode; /* charging mode requested */
137 #define CHARGE_AUTO 1
138 #define CHARGE_LINEAR 2
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
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 */
155 /* strings for 'usb_mode' values */
156 static const char *modes[] = { "off", "auto", "continuous" };
159 * clear and set bits on an given register on a given module
161 static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg)
166 ret = twl_i2c_read_u8(mod_no, &val, reg);
173 return twl_i2c_write_u8(mod_no, val, reg);
176 static int twl4030_bci_read(u8 reg, u8 *val)
178 return twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, val, reg);
181 static int twl4030_clear_set_boot_bci(u8 clear, u8 set)
183 return twl4030_clear_set(TWL_MODULE_PM_MASTER, clear,
184 TWL4030_CONFIG_DONE | TWL4030_BCIAUTOWEN | set,
185 TWL4030_PM_MASTER_BOOT_BCI);
188 static int twl4030bci_read_adc_val(u8 reg)
194 ret = twl4030_bci_read(reg + 1, &val);
198 temp = (int)(val & 0x03) << 8;
201 ret = twl4030_bci_read(reg, &val);
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
217 * convert twl register value for currents into uA
219 static int regval2ua(int regval, bool cgain)
222 return (regval * 16618 - 8500 * 1000) / 5;
224 return (regval * 16618 - 8500 * 1000) / 10;
228 * convert uA currents into twl register value
230 static int ua2regval(int ua, bool cgain)
235 ret = (ua * 10 + 8500 * 1000) / 16618;
236 /* rounding problems */
242 static int twl4030_charger_update_current(struct twl4030_bci *bci)
246 unsigned reg, cur_reg;
247 u8 bcictl1, oldreg, fullreg;
252 * If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11)
253 * and AC is enabled, set current for 'ac'
255 if (ac_available(bci->channel_vac)) {
257 bci->ac_is_active = true;
260 bci->ac_is_active = false;
261 if (cur > bci->usb_cur_target) {
262 cur = bci->usb_cur_target;
265 if (cur < bci->usb_cur_target)
266 schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY);
269 /* First, check thresholds and see if cgain is needed */
270 if (bci->ichg_eoc >= 200000)
272 if (bci->ichg_lo >= 400000)
274 if (bci->ichg_hi >= 820000)
279 status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
282 if (twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &boot_bci,
283 TWL4030_PM_MASTER_BOOT_BCI) < 0)
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
292 twl4030_clear_set_boot_bci(boot_bci, 0);
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.
299 reg = ua2regval(bci->ichg_eoc, cgain);
304 reg = (reg >> 3) & 0xf;
308 * For ichg_lo, reg value must match 10XXXX0000.
309 * XXXX is stored in low nibble of TWL4030_BCIMFTH8.
311 reg = ua2regval(bci->ichg_lo, cgain);
316 reg = (reg >> 4) & 0xf;
319 /* ichg_eoc and ichg_lo live in same register */
320 status = twl4030_bci_read(TWL4030_BCIMFTH8, &oldreg);
323 if (oldreg != fullreg) {
324 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xF4,
328 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
329 fullreg, TWL4030_BCIMFTH8);
332 /* ichg_hi threshold must be 1XXXX01100 (I think) */
333 reg = ua2regval(bci->ichg_hi, cgain);
338 fullreg = (reg >> 5) & 0xF;
340 status = twl4030_bci_read(TWL4030_BCIMFTH9, &oldreg);
343 if ((oldreg & 0xF0) != fullreg) {
344 fullreg |= (oldreg & 0x0F);
345 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
349 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
350 fullreg, TWL4030_BCIMFTH9);
354 * And finally, set the current. This is stored in
357 reg = ua2regval(cur, cgain);
358 /* we have only 10 bits */
361 status = twl4030_bci_read(TWL4030_BCIIREF1, &oldreg);
365 status = twl4030_bci_read(TWL4030_BCIIREF2, &oldreg);
368 cur_reg |= oldreg << 8;
370 /* disable write protection for one write access for
372 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
376 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
377 (reg & 0x100) ? 3 : 2,
381 /* disable write protection for one write access for
383 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
387 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
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);
401 static int twl4030_charger_get_current(void);
403 static void twl4030_current_worker(struct work_struct *data)
407 struct twl4030_bci *bci = container_of(data, struct twl4030_bci,
408 current_worker.work);
410 res = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
414 /* BCIVBUS uses ADCIN8, 7/1023 V/step */
416 curr = twl4030_charger_get_current();
418 dev_dbg(bci->dev, "v=%d cur=%d limit=%d target=%d\n", v, curr,
419 bci->usb_cur, bci->usb_cur_target);
421 if (v < USB_MIN_VOLT) {
422 /* Back up and stop adjusting. */
423 if (bci->usb_cur >= USB_CUR_STEP)
424 bci->usb_cur -= USB_CUR_STEP;
425 bci->usb_cur_target = bci->usb_cur;
426 } else if (bci->usb_cur >= bci->usb_cur_target ||
427 bci->usb_cur + USB_CUR_STEP > USB_MAX_CURRENT) {
428 /* Reached target and voltage is OK - stop */
431 bci->usb_cur += USB_CUR_STEP;
432 schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY);
434 twl4030_charger_update_current(bci);
438 * Enable/Disable USB Charge functionality.
440 static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
445 if (bci->usb_mode == CHARGE_OFF)
447 if (enable && !IS_ERR_OR_NULL(bci->transceiver)) {
449 twl4030_charger_update_current(bci);
451 /* Need to keep phy powered */
452 if (!bci->usb_enabled) {
453 pm_runtime_get_sync(bci->transceiver->dev);
454 bci->usb_enabled = 1;
457 if (bci->usb_mode == CHARGE_AUTO) {
458 /* Enable interrupts now. */
459 reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC |
460 TWL4030_TBATOR2 | TWL4030_TBATOR1 |
462 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
463 TWL4030_INTERRUPTS_BCIIMR1A);
466 "failed to unmask interrupts: %d\n",
470 /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
471 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
474 /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
475 ret = twl4030_clear_set(TWL_MODULE_MAIN_CHARGE, 0,
476 TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
477 if (bci->usb_mode == CHARGE_LINEAR) {
478 /* Enable interrupts now. */
479 reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_TBATOR2 |
480 TWL4030_TBATOR1 | TWL4030_BATSTS);
481 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
482 TWL4030_INTERRUPTS_BCIIMR1A);
485 "failed to unmask interrupts: %d\n",
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");
653 static void twl4030_bci_usb_work(struct work_struct *data)
655 struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
657 switch (bci->event) {
659 case USB_EVENT_CHARGER:
660 twl4030_charger_enable_usb(bci, true);
663 twl4030_charger_enable_usb(bci, false);
668 static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
671 struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb);
673 dev_dbg(bci->dev, "OTG notify %lu\n", val);
675 /* reset current on each 'plug' event */
677 bci->usb_cur_target = 500000;
679 bci->usb_cur_target = 100000;
682 schedule_work(&bci->work);
688 * sysfs charger enabled store
691 twl4030_bci_mode_store(struct device *dev, struct device_attribute *attr,
692 const char *buf, size_t n)
694 struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
698 mode = sysfs_match_string(modes, buf);
702 if (dev == &bci->ac->dev) {
705 twl4030_charger_enable_ac(bci, false);
707 status = twl4030_charger_enable_ac(bci, true);
709 twl4030_charger_enable_usb(bci, false);
710 bci->usb_mode = mode;
711 status = twl4030_charger_enable_usb(bci, true);
713 return (status == 0) ? n : status;
717 * sysfs charger enabled show
720 twl4030_bci_mode_show(struct device *dev,
721 struct device_attribute *attr, char *buf)
723 struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
726 int mode = bci->usb_mode;
728 if (dev == &bci->ac->dev)
731 for (i = 0; i < ARRAY_SIZE(modes); i++)
733 len += snprintf(buf+len, PAGE_SIZE-len,
736 len += snprintf(buf+len, PAGE_SIZE-len,
741 static DEVICE_ATTR(mode, 0644, twl4030_bci_mode_show,
742 twl4030_bci_mode_store);
744 static int twl4030_charger_get_current(void)
750 curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
754 ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
758 return regval2ua(curr, bcictl1 & TWL4030_CGAIN);
762 * Returns the main charge FSM state
765 static int twl4030bci_state(struct twl4030_bci *bci)
770 ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
772 dev_err(bci->dev, "error reading BCIMSTATEC\n");
776 dev_dbg(bci->dev, "state: %02x\n", state);
781 static int twl4030_bci_state_to_status(int state)
783 state &= TWL4030_MSTATEC_MASK;
784 if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
785 return POWER_SUPPLY_STATUS_CHARGING;
786 else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
787 state <= TWL4030_MSTATEC_COMPLETE4)
788 return POWER_SUPPLY_STATUS_FULL;
790 return POWER_SUPPLY_STATUS_NOT_CHARGING;
793 static int twl4030_bci_get_property(struct power_supply *psy,
794 enum power_supply_property psp,
795 union power_supply_propval *val)
797 struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent);
802 state = twl4030bci_state(bci);
806 if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
807 is_charging = state & TWL4030_MSTATEC_USB;
809 is_charging = state & TWL4030_MSTATEC_AC;
812 twl4030_bci_read(TWL4030_BCIMDEN, &s);
813 if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
818 /* A little white lie */
819 state = TWL4030_MSTATEC_QUICK1;
823 case POWER_SUPPLY_PROP_STATUS:
825 val->intval = twl4030_bci_state_to_status(state);
827 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
829 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
830 /* charging must be active for meaningful result */
833 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) {
834 ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
837 /* BCIVBUS uses ADCIN8, 7/1023 V/step */
838 val->intval = ret * 6843;
840 ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
843 /* BCIVAC uses ADCIN11, 10/1023 V/step */
844 val->intval = ret * 9775;
847 case POWER_SUPPLY_PROP_CURRENT_NOW:
850 /* current measurement is shared between AC and USB */
851 ret = twl4030_charger_get_current();
856 case POWER_SUPPLY_PROP_ONLINE:
857 val->intval = is_charging &&
858 twl4030_bci_state_to_status(state) !=
859 POWER_SUPPLY_STATUS_NOT_CHARGING;
861 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
863 if (psy->desc->type != POWER_SUPPLY_TYPE_USB) {
864 if (!bci->ac_is_active)
865 val->intval = bci->ac_cur;
867 if (bci->ac_is_active)
868 val->intval = bci->usb_cur_target;
870 if (val->intval < 0) {
873 val->intval = twl4030bci_read_adc_val(TWL4030_BCIIREF1);
876 ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
879 val->intval = regval2ua(val->intval, bcictl1 &
890 static int twl4030_bci_set_property(struct power_supply *psy,
891 enum power_supply_property psp,
892 const union power_supply_propval *val)
894 struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent);
897 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
898 if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
899 bci->usb_cur_target = val->intval;
901 bci->ac_cur = val->intval;
902 twl4030_charger_update_current(bci);
911 static int twl4030_bci_property_is_writeable(struct power_supply *psy,
912 enum power_supply_property psp)
915 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
922 static enum power_supply_property twl4030_charger_props[] = {
923 POWER_SUPPLY_PROP_STATUS,
924 POWER_SUPPLY_PROP_ONLINE,
925 POWER_SUPPLY_PROP_VOLTAGE_NOW,
926 POWER_SUPPLY_PROP_CURRENT_NOW,
927 POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
931 static const struct twl4030_bci_platform_data *
932 twl4030_bci_parse_dt(struct device *dev)
934 struct device_node *np = dev->of_node;
935 struct twl4030_bci_platform_data *pdata;
940 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
944 if (of_property_read_u32(np, "ti,bb-uvolt", &num) == 0)
945 pdata->bb_uvolt = num;
946 if (of_property_read_u32(np, "ti,bb-uamp", &num) == 0)
947 pdata->bb_uamp = num;
951 static inline const struct twl4030_bci_platform_data *
952 twl4030_bci_parse_dt(struct device *dev)
958 static const struct power_supply_desc twl4030_bci_ac_desc = {
959 .name = "twl4030_ac",
960 .type = POWER_SUPPLY_TYPE_MAINS,
961 .properties = twl4030_charger_props,
962 .num_properties = ARRAY_SIZE(twl4030_charger_props),
963 .get_property = twl4030_bci_get_property,
964 .set_property = twl4030_bci_set_property,
965 .property_is_writeable = twl4030_bci_property_is_writeable,
968 static const struct power_supply_desc twl4030_bci_usb_desc = {
969 .name = "twl4030_usb",
970 .type = POWER_SUPPLY_TYPE_USB,
971 .properties = twl4030_charger_props,
972 .num_properties = ARRAY_SIZE(twl4030_charger_props),
973 .get_property = twl4030_bci_get_property,
974 .set_property = twl4030_bci_set_property,
975 .property_is_writeable = twl4030_bci_property_is_writeable,
978 static int twl4030_bci_probe(struct platform_device *pdev)
980 struct twl4030_bci *bci;
981 const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;
985 bci = devm_kzalloc(&pdev->dev, sizeof(*bci), GFP_KERNEL);
990 pdata = twl4030_bci_parse_dt(&pdev->dev);
992 bci->ichg_eoc = 80100; /* Stop charging when current drops to here */
993 bci->ichg_lo = 241000; /* Low threshold */
994 bci->ichg_hi = 500000; /* High threshold */
995 bci->ac_cur = 500000; /* 500mA */
997 bci->usb_cur_target = 500000; /* 500mA */
999 bci->usb_cur_target = 100000; /* 100mA */
1000 bci->usb_mode = CHARGE_AUTO;
1001 bci->ac_mode = CHARGE_AUTO;
1003 bci->dev = &pdev->dev;
1004 bci->irq_chg = platform_get_irq(pdev, 0);
1005 bci->irq_bci = platform_get_irq(pdev, 1);
1007 platform_set_drvdata(pdev, bci);
1009 INIT_WORK(&bci->work, twl4030_bci_usb_work);
1010 INIT_DELAYED_WORK(&bci->current_worker, twl4030_current_worker);
1012 bci->channel_vac = devm_iio_channel_get(&pdev->dev, "vac");
1013 if (IS_ERR(bci->channel_vac)) {
1014 ret = PTR_ERR(bci->channel_vac);
1015 if (ret == -EPROBE_DEFER)
1016 return ret; /* iio not ready */
1017 dev_warn(&pdev->dev, "could not request vac iio channel (%d)",
1019 bci->channel_vac = NULL;
1022 if (bci->dev->of_node) {
1023 struct device_node *phynode;
1025 phynode = of_get_compatible_child(bci->dev->of_node->parent,
1028 bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
1029 bci->transceiver = devm_usb_get_phy_by_node(
1030 bci->dev, phynode, &bci->usb_nb);
1031 of_node_put(phynode);
1032 if (IS_ERR(bci->transceiver)) {
1033 ret = PTR_ERR(bci->transceiver);
1034 if (ret == -EPROBE_DEFER)
1035 return ret; /* phy not ready */
1036 dev_warn(&pdev->dev, "could not request transceiver (%d)",
1038 bci->transceiver = NULL;
1043 bci->ac = devm_power_supply_register(&pdev->dev, &twl4030_bci_ac_desc,
1045 if (IS_ERR(bci->ac)) {
1046 ret = PTR_ERR(bci->ac);
1047 dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
1051 bci->usb = devm_power_supply_register(&pdev->dev, &twl4030_bci_usb_desc,
1053 if (IS_ERR(bci->usb)) {
1054 ret = PTR_ERR(bci->usb);
1055 dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
1059 ret = devm_request_threaded_irq(&pdev->dev, bci->irq_chg, NULL,
1060 twl4030_charger_interrupt, IRQF_ONESHOT, pdev->name,
1063 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
1068 ret = devm_request_threaded_irq(&pdev->dev, bci->irq_bci, NULL,
1069 twl4030_bci_interrupt, IRQF_ONESHOT, pdev->name, bci);
1071 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
1076 /* Enable interrupts now. */
1077 reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 |
1078 TWL4030_TBATOR1 | TWL4030_BATSTS);
1079 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
1080 TWL4030_INTERRUPTS_BCIIMR1A);
1082 dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
1086 reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV);
1087 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
1088 TWL4030_INTERRUPTS_BCIIMR2A);
1090 dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
1092 twl4030_charger_update_current(bci);
1093 if (device_create_file(&bci->usb->dev, &dev_attr_mode))
1094 dev_warn(&pdev->dev, "could not create sysfs file\n");
1095 if (device_create_file(&bci->ac->dev, &dev_attr_mode))
1096 dev_warn(&pdev->dev, "could not create sysfs file\n");
1098 twl4030_charger_enable_ac(bci, true);
1099 if (!IS_ERR_OR_NULL(bci->transceiver))
1100 twl4030_bci_usb_ncb(&bci->usb_nb,
1101 bci->transceiver->last_event,
1104 twl4030_charger_enable_usb(bci, false);
1106 twl4030_charger_enable_backup(pdata->bb_uvolt,
1109 twl4030_charger_enable_backup(0, 0);
1114 static int twl4030_bci_remove(struct platform_device *pdev)
1116 struct twl4030_bci *bci = platform_get_drvdata(pdev);
1118 twl4030_charger_enable_ac(bci, false);
1119 twl4030_charger_enable_usb(bci, false);
1120 twl4030_charger_enable_backup(0, 0);
1122 device_remove_file(&bci->usb->dev, &dev_attr_mode);
1123 device_remove_file(&bci->ac->dev, &dev_attr_mode);
1124 /* mask interrupts */
1125 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
1126 TWL4030_INTERRUPTS_BCIIMR1A);
1127 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
1128 TWL4030_INTERRUPTS_BCIIMR2A);
1133 static const struct of_device_id twl_bci_of_match[] = {
1134 {.compatible = "ti,twl4030-bci", },
1137 MODULE_DEVICE_TABLE(of, twl_bci_of_match);
1139 static struct platform_driver twl4030_bci_driver = {
1140 .probe = twl4030_bci_probe,
1141 .remove = twl4030_bci_remove,
1143 .name = "twl4030_bci",
1144 .of_match_table = of_match_ptr(twl_bci_of_match),
1147 module_platform_driver(twl4030_bci_driver);
1149 MODULE_AUTHOR("Gražvydas Ignotas");
1150 MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
1151 MODULE_LICENSE("GPL");
1152 MODULE_ALIAS("platform:twl4030_bci");