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/platform_device.h>
19 #include <linux/interrupt.h>
20 #include <linux/i2c/twl.h>
21 #include <linux/power_supply.h>
22 #include <linux/notifier.h>
23 #include <linux/usb/otg.h>
24 #include <linux/ratelimit.h>
25 #include <linux/regulator/machine.h>
26 #include <linux/leds.h>
28 #define TWL4030_BCIMSTATEC 0x02
29 #define TWL4030_BCIICHG 0x08
30 #define TWL4030_BCIVAC 0x0a
31 #define TWL4030_BCIVBUS 0x0c
32 #define TWL4030_BCIMFSTS3 0x0f
33 #define TWL4030_BCIMFSTS4 0x10
34 #define TWL4030_BCIMFKEY 0x11
35 #define TWL4030_BCIMFTH8 0x1d
36 #define TWL4030_BCICTL1 0x23
37 #define TWL4030_BCIIREF1 0x27
38 #define TWL4030_BCIIREF2 0x28
40 #define TWL4030_BCIAUTOWEN BIT(5)
41 #define TWL4030_CONFIG_DONE BIT(4)
42 #define TWL4030_CVENAC BIT(2)
43 #define TWL4030_BCIAUTOUSB BIT(1)
44 #define TWL4030_BCIAUTOAC BIT(0)
45 #define TWL4030_CGAIN BIT(5)
46 #define TWL4030_USBFASTMCHG BIT(2)
47 #define TWL4030_STS_VBUS BIT(7)
48 #define TWL4030_STS_USB_ID BIT(2)
49 #define TWL4030_STS_CHG BIT(1)
52 #define TWL4030_WOVF BIT(0) /* Watchdog overflow */
53 #define TWL4030_TMOVF BIT(1) /* Timer overflow */
54 #define TWL4030_ICHGHIGH BIT(2) /* Battery charge current high */
55 #define TWL4030_ICHGLOW BIT(3) /* Battery cc. low / FSM state change */
56 #define TWL4030_ICHGEOC BIT(4) /* Battery current end-of-charge */
57 #define TWL4030_TBATOR2 BIT(5) /* Battery temperature out of range 2 */
58 #define TWL4030_TBATOR1 BIT(6) /* Battery temperature out of range 1 */
59 #define TWL4030_BATSTS BIT(7) /* Battery status */
61 #define TWL4030_VBATLVL BIT(0) /* VBAT level */
62 #define TWL4030_VBATOV BIT(1) /* VBAT overvoltage */
63 #define TWL4030_VBUSOV BIT(2) /* VBUS overvoltage */
64 #define TWL4030_ACCHGOV BIT(3) /* Ac charger overvoltage */
66 #define TWL4030_MSTATEC_USB BIT(4)
67 #define TWL4030_MSTATEC_AC BIT(5)
68 #define TWL4030_MSTATEC_MASK 0x0f
69 #define TWL4030_MSTATEC_QUICK1 0x02
70 #define TWL4030_MSTATEC_QUICK7 0x07
71 #define TWL4030_MSTATEC_COMPLETE1 0x0b
72 #define TWL4030_MSTATEC_COMPLETE4 0x0e
74 #define TWL4030_KEY_IIREF 0xe7
75 #define TWL4030_KEY_MFTH8 0xf4
76 #define TWL4030_BATSTSMCHG BIT(6)
78 #define IRQ_CHECK_PERIOD (3 * HZ)
79 #define IRQ_CHECK_THRESHOLD 4
81 /* By default, 80mA */
82 static unsigned end_of_charge_current = 200000;
83 module_param(end_of_charge_current, uint, 0);
84 MODULE_PARM_DESC(end_of_charge_current,
85 "Stop charging when the charger current goes below this threshold");
87 static bool allow_usb = 1;
88 module_param(allow_usb, bool, 0644);
89 MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");
93 struct power_supply ac;
94 struct power_supply usb;
95 struct otg_transceiver *transceiver;
96 struct notifier_block otg_nb;
97 struct work_struct work;
100 bool ac_charge_enable;
101 bool usb_charge_enable;
104 enum power_supply_type current_supply;
105 struct regulator *usb_reg;
109 unsigned charge_current;
110 unsigned eoc_current;
112 unsigned long irq_check_count_time;
114 int irq_check_ac_disabled;
116 struct led_trigger *charging_any_trig;
117 int was_charging_any;
120 struct ratelimit_state ratelimit;
124 * clear and set bits on an given register on a given module
126 static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg)
131 ret = twl_i2c_read_u8(mod_no, &val, reg);
138 return twl_i2c_write_u8(mod_no, val, reg);
141 static int twl4030_bci_read(u8 reg, u8 *val)
143 return twl_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE, val, reg);
146 static int twl4030_bci_write(u8 reg, u8 val)
148 return twl_i2c_write_u8(TWL4030_MODULE_MAIN_CHARGE, val, reg);
151 static int twl4030_clear_set_boot_bci(u8 clear, u8 set)
153 return twl4030_clear_set(TWL4030_MODULE_PM_MASTER, clear,
154 TWL4030_CONFIG_DONE | TWL4030_BCIAUTOWEN | set,
155 TWL4030_PM_MASTER_BOOT_BCI);
158 static int twl4030bci_read_adc_val(u8 reg)
164 ret = twl4030_bci_read(reg + 1, &val);
168 temp = (int)(val & 0x03) << 8;
171 ret = twl4030_bci_read(reg, &val);
178 static int twl4030bci_get_cgain(struct twl4030_bci *bci, int *cgain) {
182 ret = twl4030_bci_read(TWL4030_BCICTL1, ®);
184 dev_warn(bci->dev, "error fetching CGAIN value from BCICTL1 register");
187 *cgain = (reg & TWL4030_CGAIN) ? 1 : 0;
193 * Check if VBUS power is present
195 static int twl4030_bci_have_vbus(struct twl4030_bci *bci)
200 ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &hwsts,
201 TWL4030_PM_MASTER_STS_HW_CONDITIONS);
205 dev_dbg(bci->dev, "check_vbus: HW_CONDITIONS %02x\n", hwsts);
207 /* in case we also have STS_USB_ID, VBUS is driven by TWL itself */
208 if ((hwsts & TWL4030_STS_VBUS) && !(hwsts & TWL4030_STS_USB_ID))
215 * Enable/Disable USB Charge functionality.
217 static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
222 if (!bci->usb_charge_enable)
225 /* Check for USB charger conneted */
226 if (!twl4030_bci_have_vbus(bci))
230 * Until we can find out what current the device can provide,
231 * require a module param to enable USB charging.
234 dev_warn(bci->dev, "USB charging is disabled.\n");
238 /* Need to keep regulator on */
239 if (!bci->usb_enabled &&
241 regulator_enable(bci->usb_reg) == 0)
242 bci->usb_enabled = 1;
244 /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
245 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
249 /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
250 ret = twl4030_clear_set(TWL4030_MODULE_MAIN_CHARGE, 0,
251 TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
253 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
254 if (bci->usb_enabled &&
255 regulator_disable(bci->usb_reg) == 0)
256 bci->usb_enabled = 0;
263 * Enable/Disable AC Charge funtionality.
265 static int twl4030_charger_enable_ac(bool enable)
270 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
272 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
277 static int update_charge_parameters(struct twl4030_bci *bci,
278 int charge_current, int eoc_current)
280 int old_charge_current = bci->charge_current;
281 int old_eoc_current = bci->eoc_current;
284 u16 hw_charge_current;
285 u8 hw_eoc_current, boot_bci_prev, reg, cgain_set, cgain_clear;
286 bool need_cgain = false;
287 bool restore_boot_reg = false;
289 if (charge_current < 0 && eoc_current < 0)
292 ret = twl4030_bci_read(TWL4030_BCIMFSTS3, ®);
295 if (!(reg & TWL4030_BATSTSMCHG)) {
296 dev_err(bci->dev, "missing battery, can't change charging parameters\n");
300 if (charge_current >= 0)
301 bci->charge_current = charge_current;
302 if (eoc_current >= 0)
303 bci->eoc_current = eoc_current;
305 hw_eoc_current = bci->eoc_current / 13310;
306 if (hw_eoc_current > 15)
309 hw_charge_current = (bci->charge_current * 1000) / 1666666;
310 if (hw_charge_current > 511)
315 hw_charge_current /= 2;
318 if (hw_eoc_current > 15) {
322 if (hw_charge_current > 511) {
327 ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &boot_bci_prev,
328 TWL4030_PM_MASTER_BOOT_BCI);
333 * Stop automatic charging here, because charge current change
334 * requires multiple register writes and CGAIN change requires
335 * automatic charge to be stopped (and CV mode disabled too).
337 ret = twl4030_clear_set_boot_bci(
338 TWL4030_CVENAC | TWL4030_BCIAUTOAC | TWL4030_BCIAUTOUSB, 0);
342 restore_boot_reg = true;
344 ret = twl4030_bci_write(TWL4030_BCIMFKEY, TWL4030_KEY_MFTH8);
347 ret = twl4030_clear_set(TWL4030_MODULE_MAIN_CHARGE, 0xf0,
348 hw_eoc_current << 4, TWL4030_BCIMFTH8);
352 ret = twl4030_bci_write(TWL4030_BCIMFKEY, TWL4030_KEY_IIREF);
355 ret = twl4030_bci_write(TWL4030_BCIIREF1, hw_charge_current & 0xff);
358 ret = twl4030_bci_write(TWL4030_BCIMFKEY, TWL4030_KEY_IIREF);
361 ret = twl4030_bci_write(TWL4030_BCIIREF2, (hw_charge_current >> 8) & 0x1);
366 cgain_set = TWL4030_CGAIN;
370 cgain_clear = TWL4030_CGAIN;
373 ret = twl4030_clear_set(TWL4030_MODULE_MAIN_CHARGE,
374 cgain_clear, cgain_set, TWL4030_BCICTL1);
378 ret = twl4030_bci_read(TWL4030_BCICTL1, ®);
379 if (ret != 0 || (reg & TWL4030_CGAIN) != cgain_set) {
380 dev_err(bci->dev, "CGAIN change failed\n");
385 if (restore_boot_reg && (ret2 = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER,
386 boot_bci_prev, TWL4030_PM_MASTER_BOOT_BCI))) {
387 dev_err(bci->dev, "failed boot_bci restore: %d\n", ret2);
393 if (charge_current >= 0)
394 bci->charge_current = old_charge_current;
395 if (eoc_current >= 0)
396 bci->eoc_current = old_eoc_current;
401 dev_err(bci->dev, "failed to change charging parameters\n");
407 * TWL4030 CHG_PRES (AC charger presence) events
409 static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
411 struct twl4030_bci *bci = arg;
416 ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &hw_cond,
417 TWL4030_PM_MASTER_STS_HW_CONDITIONS);
419 dev_err(bci->dev, "HW_CONDITIONS read failed: %d\n", ret);
423 have_charger = (hw_cond & TWL4030_STS_CHG) ? 1 : 0;
424 if (have_charger == bci->irq_had_charger)
426 bci->irq_had_charger = have_charger;
428 dev_dbg(bci->dev, "CHG_PRES irq, hw_cond %02x\n", hw_cond);
431 * deal with rare mysterious issue of CHG_PRES changing states at ~4Hz
432 * without any charger connected or anything
434 if (time_before(jiffies, bci->irq_check_count_time + IRQ_CHECK_PERIOD)) {
435 bci->irq_check_count++;
436 if (have_charger && bci->irq_check_count > IRQ_CHECK_THRESHOLD) {
437 dev_err(bci->dev, "spurious CHG_PRES irqs detected (%d), disabling charger\n",
438 bci->irq_check_count);
439 twl4030_charger_enable_ac(false);
440 bci->irq_check_ac_disabled = true;
443 bci->irq_check_count_time = jiffies;
444 bci->irq_check_count = 1;
445 if (have_charger && bci->irq_check_ac_disabled) {
446 twl4030_charger_enable_ac(true);
447 bci->irq_check_ac_disabled = false;
451 power_supply_changed(&bci->ac);
452 power_supply_changed(&bci->usb);
459 * TWL4030 BCI monitoring events
461 static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
463 struct twl4030_bci *bci = arg;
467 ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
468 TWL4030_INTERRUPTS_BCIISR1A);
472 ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
473 TWL4030_INTERRUPTS_BCIISR2A);
477 dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);
479 if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) {
480 /* charger state change, inform the core */
481 power_supply_changed(&bci->ac);
482 power_supply_changed(&bci->usb);
485 /* various monitoring events, for now we just log them here */
486 if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1) &&
487 __ratelimit(&bci->ratelimit))
488 dev_warn(bci->dev, "battery temperature out of range\n");
490 if (irqs1 & TWL4030_BATSTS && __ratelimit(&bci->ratelimit))
491 dev_crit(bci->dev, "battery disconnected\n");
493 if (irqs2 & TWL4030_VBATOV && __ratelimit(&bci->ratelimit))
494 dev_crit(bci->dev, "VBAT overvoltage\n");
496 if (irqs2 & TWL4030_VBUSOV && __ratelimit(&bci->ratelimit))
497 dev_crit(bci->dev, "VBUS overvoltage\n");
499 if (irqs2 & TWL4030_ACCHGOV && __ratelimit(&bci->ratelimit))
500 dev_crit(bci->dev, "Ac charger overvoltage\n");
503 /* ack the interrupts */
504 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, irqs1,
505 TWL4030_INTERRUPTS_BCIISR1A);
506 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, irqs2,
507 TWL4030_INTERRUPTS_BCIISR2A);
513 static void twl4030_bci_usb_work(struct work_struct *data)
515 struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
517 switch (bci->event) {
519 case USB_EVENT_CHARGER:
520 twl4030_charger_enable_usb(bci, true);
523 twl4030_charger_enable_usb(bci, false);
528 static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
531 struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, otg_nb);
533 dev_dbg(bci->dev, "OTG notify %lu\n", val);
536 schedule_work(&bci->work);
542 * TI provided formulas:
543 * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85
544 * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7
545 * Here we use integer approximation of:
546 * CGAIN == 0: val * 1.6618 - 0.85
547 * CGAIN == 1: (val * 1.6618 - 0.85) * 2
549 static int twl4030_charger_get_current(struct twl4030_bci *bci)
555 curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
559 if ((ret = twl4030bci_get_cgain(bci, &cgain)))
562 ret = (curr * 16618 - 850 * 10000) / 10;
569 static int twl4030bci_get_charging_current(struct twl4030_bci *bci, int *curr)
573 val = twl4030bci_read_adc_val(TWL4030_BCIIREF1);
576 if ((ret = twl4030bci_get_cgain(bci, &cgain)))
589 static int twl4030bci_get_eoc_current(struct twl4030_bci *bci, int *curr)
591 int ret, cgain, ichgeocth;
594 if ((ret = twl4030bci_get_cgain(bci, &cgain)))
597 ret = twl4030_bci_read(TWL4030_BCIMFTH8, ®);
599 dev_warn(bci->dev, "error fetching BCIMFTH8 register");
602 ichgeocth = reg >> 4;
604 *curr = (ichgeocth * 13310) * ((cgain) ? 2 : 1);
609 static ssize_t twl4030_bci_ac_show_enable(struct device *dev,
610 struct device_attribute *attr,
616 ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &boot_bci,
617 TWL4030_PM_MASTER_BOOT_BCI);
621 return sprintf(buf, "%d\n", (boot_bci & TWL4030_BCIAUTOAC) ? 1 : 0);
624 static ssize_t twl4030_bci_ac_store_enable(struct device *dev,
625 struct device_attribute *attr,
626 const char *buf, size_t count)
628 struct power_supply *psy = dev_get_drvdata(dev);
629 struct twl4030_bci *bci = container_of(psy, struct twl4030_bci, ac);
630 unsigned long enable;
633 ret = strict_strtoul(buf, 10, &enable);
634 if (ret || enable > 1)
637 bci->ac_charge_enable = enable;
638 twl4030_charger_enable_ac(enable);
642 static struct device_attribute dev_attr_enable_ac =
643 __ATTR(enable, S_IRUGO | S_IWUSR, twl4030_bci_ac_show_enable,
644 twl4030_bci_ac_store_enable);
646 static ssize_t twl4030_bci_usb_show_enable(struct device *dev,
647 struct device_attribute *attr,
653 ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &boot_bci,
654 TWL4030_PM_MASTER_BOOT_BCI);
658 return sprintf(buf, "%d\n", (boot_bci & TWL4030_BCIAUTOUSB) ? 1 : 0);
661 static ssize_t twl4030_bci_usb_store_enable(struct device *dev,
662 struct device_attribute *attr,
663 const char *buf, size_t count)
665 struct power_supply *psy = dev_get_drvdata(dev);
666 struct twl4030_bci *bci = container_of(psy, struct twl4030_bci, usb);
667 unsigned long enable;
670 ret = strict_strtoul(buf, 10, &enable);
671 if (ret || enable > 1)
674 bci->usb_charge_enable = enable;
675 twl4030_charger_enable_usb(bci, enable);
679 static struct device_attribute dev_attr_enable_usb =
680 __ATTR(enable, S_IRUGO | S_IWUSR, twl4030_bci_usb_show_enable,
681 twl4030_bci_usb_store_enable);
683 static ssize_t show_charge_current(struct device *dev,
684 struct device_attribute *attr, char *buf)
686 struct power_supply *psy = dev_get_drvdata(dev);
687 struct twl4030_bci *bci = dev_get_drvdata(psy->dev->parent);
690 if ((ret = twl4030bci_get_charging_current(bci, &val)))
693 return sprintf(buf, "%d\n", val);
696 static ssize_t store_charge_current(struct device *dev,
697 struct device_attribute *attr, const char *buf,
700 struct power_supply *psy = dev_get_drvdata(dev);
701 struct twl4030_bci *bci = dev_get_drvdata(psy->dev->parent);
702 unsigned long new_current;
705 ret = strict_strtoul(buf, 10, &new_current);
710 * Previously, this sysfs parameter used a different raw-register
711 * format. All legal values in this format fall numerically into the
712 * range [0, 1023]. Since in the new format, these encode values so
713 * low as to be meaningless, reject them here so that anybody trying
714 * to use the old format will have at least a chance of figuring out
715 * why it isn't working any more. Note that in both formats, the value
716 * 0 has the same meaning, so it is allowed where values in the range
719 if (new_current < 1024 && new_current != 0)
722 ret = update_charge_parameters(bci, new_current, -1);
726 if (psy->type == POWER_SUPPLY_TYPE_MAINS)
727 bci->ac_current = new_current;
729 bci->usb_current = new_current;
733 static DEVICE_ATTR(charge_current, S_IRUGO | S_IWUSR, show_charge_current,
734 store_charge_current);
736 static ssize_t show_end_of_charge_current(struct device *dev,
737 struct device_attribute *attr, char *buf)
739 struct power_supply *psy = dev_get_drvdata(dev);
740 struct twl4030_bci *bci = dev_get_drvdata(psy->dev->parent);
741 int ret, eoc_current;
743 if ((ret = twl4030bci_get_eoc_current(bci, &eoc_current)))
746 return sprintf(buf, "%d\n", eoc_current);
749 static ssize_t store_end_of_charge_current(struct device *dev,
750 struct device_attribute *attr, const char *buf,
753 struct power_supply *psy = dev_get_drvdata(dev);
754 struct twl4030_bci *bci = dev_get_drvdata(psy->dev->parent);
755 unsigned long new_eoc_current;
756 int eoc_current, ret;
758 ret = strict_strtoul(buf, 10, &new_eoc_current);
762 eoc_current = new_eoc_current;
763 /* check for overflow */
764 if (eoc_current != new_eoc_current)
767 if ((ret = update_charge_parameters(bci, -1, eoc_current)))
773 static DEVICE_ATTR(end_of_charge_current, S_IRUGO | S_IWUSR,
774 show_end_of_charge_current, store_end_of_charge_current);
776 static struct attribute *bci_ac_attrs[] = {
777 &dev_attr_enable_ac.attr,
778 &dev_attr_charge_current.attr,
779 &dev_attr_end_of_charge_current.attr,
783 static struct attribute *bci_usb_attrs[] = {
784 &dev_attr_enable_usb.attr,
785 &dev_attr_charge_current.attr,
786 &dev_attr_end_of_charge_current.attr,
790 static const struct attribute_group bci_ac_attr_group = {
791 .attrs = bci_ac_attrs,
794 static const struct attribute_group bci_usb_attr_group = {
795 .attrs = bci_usb_attrs,
799 * Returns the main charge FSM state
802 static int twl4030bci_state(struct twl4030_bci *bci)
807 ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
809 pr_err("twl4030_bci: error reading BCIMSTATEC\n");
813 dev_dbg(bci->dev, "state: %02x\n", state);
818 static int twl4030_bci_state_to_status(int state)
820 state &= TWL4030_MSTATEC_MASK;
821 if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
822 return POWER_SUPPLY_STATUS_CHARGING;
823 else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
824 state <= TWL4030_MSTATEC_COMPLETE4)
825 return POWER_SUPPLY_STATUS_FULL;
827 return POWER_SUPPLY_STATUS_NOT_CHARGING;
830 static int twl4030_bci_get_property(struct power_supply *psy,
831 enum power_supply_property psp,
832 union power_supply_propval *val)
834 struct twl4030_bci *bci = dev_get_drvdata(psy->dev->parent);
835 int is_charging_any = 0;
840 state = twl4030bci_state(bci);
844 if (twl4030_bci_state_to_status(state) ==
845 POWER_SUPPLY_STATUS_CHARGING) {
847 state & (TWL4030_MSTATEC_USB | TWL4030_MSTATEC_AC);
848 if (psy->type == POWER_SUPPLY_TYPE_USB)
849 is_charging = state & TWL4030_MSTATEC_USB;
851 is_charging = state & TWL4030_MSTATEC_AC;
854 if (is_charging_any != bci->was_charging_any) {
855 led_trigger_event(bci->charging_any_trig,
856 is_charging_any ? LED_FULL : LED_OFF);
857 bci->was_charging_any = is_charging_any;
860 if (is_charging && psy->type != bci->current_supply) {
861 if (psy->type == POWER_SUPPLY_TYPE_USB)
862 update_charge_parameters(bci, bci->usb_current, -1);
864 update_charge_parameters(bci, bci->ac_current, -1);
865 bci->current_supply = psy->type;
869 case POWER_SUPPLY_PROP_STATUS:
871 val->intval = twl4030_bci_state_to_status(state);
873 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
875 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
876 /* charging must be active for meaningful result */
879 if (psy->type == POWER_SUPPLY_TYPE_USB) {
880 ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
883 /* BCIVBUS uses ADCIN8, 7/1023 V/step */
884 val->intval = ret * 6843;
886 ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
889 /* BCIVAC uses ADCIN11, 10/1023 V/step */
890 val->intval = ret * 9775;
893 case POWER_SUPPLY_PROP_CURRENT_NOW:
896 /* current measurement is shared between AC and USB */
897 ret = twl4030_charger_get_current(bci);
902 case POWER_SUPPLY_PROP_ONLINE:
903 val->intval = is_charging &&
904 twl4030_bci_state_to_status(state) !=
905 POWER_SUPPLY_STATUS_NOT_CHARGING;
914 static enum power_supply_property twl4030_charger_props[] = {
915 POWER_SUPPLY_PROP_STATUS,
916 POWER_SUPPLY_PROP_ONLINE,
917 POWER_SUPPLY_PROP_VOLTAGE_NOW,
918 POWER_SUPPLY_PROP_CURRENT_NOW,
921 static int __init twl4030_bci_probe(struct platform_device *pdev)
923 const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;
924 struct twl4030_bci *bci;
929 dev_err(&pdev->dev, "No platform data\n");
933 bci = kzalloc(sizeof(*bci), GFP_KERNEL);
937 bci->dev = &pdev->dev;
938 bci->irq_chg = platform_get_irq(pdev, 0);
939 bci->irq_bci = platform_get_irq(pdev, 1);
940 bci->ac_current = 1200000; /* ~1.2A */
941 bci->usb_current = 530000; /* ~530mA */
944 * Make sure to set sane charging settings
947 * ~500mA (doesn't really get used, overridden by ac_current or
948 * usb_current as soon as a charger is plugged in).
950 * end_of_charge_current:
951 * taken from the module parameter.
953 if ((ret = update_charge_parameters(bci,
954 500000, end_of_charge_current)))
955 goto fail_set_charge_params;
957 bci->irq_had_charger = -1;
958 bci->irq_check_count_time = jiffies;
960 platform_set_drvdata(pdev, bci);
962 ratelimit_state_init(&bci->ratelimit, HZ, 2);
964 led_trigger_register_simple("twl4030_bci-charging",
965 &bci->charging_any_trig);
967 bci->ac.name = "twl4030_ac";
968 bci->ac.type = POWER_SUPPLY_TYPE_MAINS;
969 bci->ac.properties = twl4030_charger_props;
970 bci->ac.num_properties = ARRAY_SIZE(twl4030_charger_props);
971 bci->ac.get_property = twl4030_bci_get_property;
972 bci->ac.supplied_to = pdata->supplied_to;
973 bci->ac.num_supplicants = pdata->num_supplicants;
975 ret = power_supply_register(&pdev->dev, &bci->ac);
977 dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
978 goto fail_register_ac;
981 bci->usb.name = "twl4030_usb";
982 bci->usb.type = POWER_SUPPLY_TYPE_USB;
983 bci->usb.properties = twl4030_charger_props;
984 bci->usb.num_properties = ARRAY_SIZE(twl4030_charger_props);
985 bci->usb.get_property = twl4030_bci_get_property;
986 bci->usb.supplied_to = pdata->supplied_to;
987 bci->usb.num_supplicants = pdata->num_supplicants;
989 bci->usb_reg = regulator_get(bci->dev, "bci3v1");
990 if (IS_ERR(bci->usb_reg)) {
991 dev_warn(&pdev->dev, "regulator get bci3v1 failed\n");
995 ret = power_supply_register(&pdev->dev, &bci->usb);
997 dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
998 goto fail_register_usb;
1001 ret = request_threaded_irq(bci->irq_chg, NULL,
1002 twl4030_charger_interrupt, 0, pdev->name, bci);
1004 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
1009 ret = request_threaded_irq(bci->irq_bci, NULL,
1010 twl4030_bci_interrupt, 0, pdev->name, bci);
1012 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
1017 INIT_WORK(&bci->work, twl4030_bci_usb_work);
1019 bci->transceiver = otg_get_transceiver();
1020 if (bci->transceiver != NULL) {
1021 bci->otg_nb.notifier_call = twl4030_bci_usb_ncb;
1022 otg_register_notifier(bci->transceiver, &bci->otg_nb);
1025 ret = sysfs_create_group(&bci->ac.dev->kobj, &bci_ac_attr_group);
1027 dev_err(&pdev->dev, "failed to create sysfs group: %d\n", ret);
1031 ret = sysfs_create_group(&bci->usb.dev->kobj, &bci_usb_attr_group);
1033 dev_err(&pdev->dev, "failed to create sysfs group: %d\n", ret);
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);
1043 dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
1044 goto fail_unmask_interrupts;
1047 reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV);
1048 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
1049 TWL4030_INTERRUPTS_BCIIMR2A);
1051 dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
1053 bci->ac_charge_enable = true;
1054 bci->usb_charge_enable = true;
1055 twl4030_charger_enable_ac(true);
1056 twl4030_charger_enable_usb(bci, true);
1060 fail_unmask_interrupts:
1061 sysfs_remove_group(&bci->usb.dev->kobj, &bci_usb_attr_group);
1063 sysfs_remove_group(&bci->ac.dev->kobj, &bci_ac_attr_group);
1065 if (bci->transceiver != NULL) {
1066 otg_unregister_notifier(bci->transceiver, &bci->otg_nb);
1067 otg_put_transceiver(bci->transceiver);
1069 free_irq(bci->irq_bci, bci);
1071 free_irq(bci->irq_chg, bci);
1073 power_supply_unregister(&bci->usb);
1075 power_supply_unregister(&bci->ac);
1078 if (bci->usb_enabled)
1079 regulator_disable(bci->usb_reg);
1080 regulator_put(bci->usb_reg);
1084 led_trigger_unregister_simple(bci->charging_any_trig);
1085 platform_set_drvdata(pdev, NULL);
1087 fail_set_charge_params:
1093 static int __exit twl4030_bci_remove(struct platform_device *pdev)
1095 struct twl4030_bci *bci = platform_get_drvdata(pdev);
1097 sysfs_remove_group(&bci->usb.dev->kobj, &bci_usb_attr_group);
1098 sysfs_remove_group(&bci->ac.dev->kobj, &bci_ac_attr_group);
1100 twl4030_charger_enable_ac(false);
1101 twl4030_charger_enable_usb(bci, false);
1103 /* mask interrupts */
1104 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
1105 TWL4030_INTERRUPTS_BCIIMR1A);
1106 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
1107 TWL4030_INTERRUPTS_BCIIMR2A);
1109 if (bci->transceiver != NULL) {
1110 otg_unregister_notifier(bci->transceiver, &bci->otg_nb);
1111 otg_put_transceiver(bci->transceiver);
1113 free_irq(bci->irq_bci, bci);
1114 free_irq(bci->irq_chg, bci);
1115 power_supply_unregister(&bci->usb);
1116 power_supply_unregister(&bci->ac);
1119 if (bci->usb_enabled)
1120 regulator_disable(bci->usb_reg);
1121 regulator_put(bci->usb_reg);
1124 led_trigger_unregister_simple(bci->charging_any_trig);
1125 platform_set_drvdata(pdev, NULL);
1131 static struct platform_driver twl4030_bci_driver = {
1133 .name = "twl4030_bci",
1134 .owner = THIS_MODULE,
1136 .remove = __exit_p(twl4030_bci_remove),
1139 static int __init twl4030_bci_init(void)
1141 return platform_driver_probe(&twl4030_bci_driver, twl4030_bci_probe);
1143 module_init(twl4030_bci_init);
1145 static void __exit twl4030_bci_exit(void)
1147 platform_driver_unregister(&twl4030_bci_driver);
1149 module_exit(twl4030_bci_exit);
1151 MODULE_AUTHOR("Gražvydas Ignotas");
1152 MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
1153 MODULE_LICENSE("GPL");
1154 MODULE_ALIAS("platform:twl4030_bci");