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>
26 #define TWL4030_BCIMSTATEC 0x02
27 #define TWL4030_BCIICHG 0x08
28 #define TWL4030_BCIVAC 0x0a
29 #define TWL4030_BCIVBUS 0x0c
30 #define TWL4030_BCIMFSTS4 0x10
31 #define TWL4030_BCICTL1 0x23
33 #define TWL4030_BCIAUTOWEN BIT(5)
34 #define TWL4030_CONFIG_DONE BIT(4)
35 #define TWL4030_BCIAUTOUSB BIT(1)
36 #define TWL4030_BCIAUTOAC BIT(0)
37 #define TWL4030_CGAIN BIT(5)
38 #define TWL4030_USBFASTMCHG BIT(2)
39 #define TWL4030_STS_VBUS BIT(7)
40 #define TWL4030_STS_USB_ID BIT(2)
43 #define TWL4030_WOVF BIT(0) /* Watchdog overflow */
44 #define TWL4030_TMOVF BIT(1) /* Timer overflow */
45 #define TWL4030_ICHGHIGH BIT(2) /* Battery charge current high */
46 #define TWL4030_ICHGLOW BIT(3) /* Battery cc. low / FSM state change */
47 #define TWL4030_ICHGEOC BIT(4) /* Battery current end-of-charge */
48 #define TWL4030_TBATOR2 BIT(5) /* Battery temperature out of range 2 */
49 #define TWL4030_TBATOR1 BIT(6) /* Battery temperature out of range 1 */
50 #define TWL4030_BATSTS BIT(7) /* Battery status */
52 #define TWL4030_VBATLVL BIT(0) /* VBAT level */
53 #define TWL4030_VBATOV BIT(1) /* VBAT overvoltage */
54 #define TWL4030_VBUSOV BIT(2) /* VBUS overvoltage */
55 #define TWL4030_ACCHGOV BIT(3) /* Ac charger overvoltage */
57 #define TWL4030_MSTATEC_USB BIT(4)
58 #define TWL4030_MSTATEC_AC BIT(5)
59 #define TWL4030_MSTATEC_MASK 0x0f
60 #define TWL4030_MSTATEC_QUICK1 0x02
61 #define TWL4030_MSTATEC_QUICK7 0x07
62 #define TWL4030_MSTATEC_COMPLETE1 0x0b
63 #define TWL4030_MSTATEC_COMPLETE4 0x0e
65 static bool allow_usb = 1;
66 module_param(allow_usb, bool, 0644);
67 MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");
71 struct power_supply ac;
72 struct power_supply usb;
73 struct otg_transceiver *transceiver;
74 struct notifier_block otg_nb;
75 struct work_struct work;
80 struct ratelimit_state ratelimit;
84 * clear and set bits on an given register on a given module
86 static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg)
91 ret = twl_i2c_read_u8(mod_no, &val, reg);
98 return twl_i2c_write_u8(mod_no, val, reg);
101 static int twl4030_bci_read(u8 reg, u8 *val)
103 return twl_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE, val, reg);
106 static int twl4030_clear_set_boot_bci(u8 clear, u8 set)
108 return twl4030_clear_set(TWL4030_MODULE_PM_MASTER, 0,
109 TWL4030_CONFIG_DONE | TWL4030_BCIAUTOWEN | set,
110 TWL4030_PM_MASTER_BOOT_BCI);
113 static int twl4030bci_read_adc_val(u8 reg)
119 ret = twl4030_bci_read(reg + 1, &val);
123 temp = (int)(val & 0x03) << 8;
126 ret = twl4030_bci_read(reg, &val);
134 * Check if VBUS power is present
136 static int twl4030_bci_have_vbus(struct twl4030_bci *bci)
141 ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &hwsts,
142 TWL4030_PM_MASTER_STS_HW_CONDITIONS);
146 dev_dbg(bci->dev, "check_vbus: HW_CONDITIONS %02x\n", hwsts);
148 /* in case we also have STS_USB_ID, VBUS is driven by TWL itself */
149 if ((hwsts & TWL4030_STS_VBUS) && !(hwsts & TWL4030_STS_USB_ID))
156 * Enable/Disable USB Charge funtionality.
158 static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
163 /* Check for USB charger conneted */
164 if (!twl4030_bci_have_vbus(bci))
168 * Until we can find out what current the device can provide,
169 * require a module param to enable USB charging.
172 dev_warn(bci->dev, "USB charging is disabled.\n");
176 /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
177 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
181 /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
182 ret = twl4030_clear_set(TWL4030_MODULE_MAIN_CHARGE, 0,
183 TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
185 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
192 * Enable/Disable AC Charge funtionality.
194 static int twl4030_charger_enable_ac(bool enable)
199 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
201 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
207 * TWL4030 CHG_PRES (AC charger presence) events
209 static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
211 struct twl4030_bci *bci = arg;
213 dev_dbg(bci->dev, "CHG_PRES irq\n");
214 power_supply_changed(&bci->ac);
215 power_supply_changed(&bci->usb);
221 * TWL4030 BCI monitoring events
223 static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
225 struct twl4030_bci *bci = arg;
229 ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
230 TWL4030_INTERRUPTS_BCIISR1A);
234 ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
235 TWL4030_INTERRUPTS_BCIISR2A);
239 dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);
241 if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) {
242 /* charger state change, inform the core */
243 power_supply_changed(&bci->ac);
244 power_supply_changed(&bci->usb);
247 /* various monitoring events, for now we just log them here */
248 if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1) &&
249 __ratelimit(&bci->ratelimit))
250 dev_warn(bci->dev, "battery temperature out of range\n");
252 if (irqs1 & TWL4030_BATSTS && __ratelimit(&bci->ratelimit))
253 dev_crit(bci->dev, "battery disconnected\n");
255 if (irqs2 & TWL4030_VBATOV && __ratelimit(&bci->ratelimit))
256 dev_crit(bci->dev, "VBAT overvoltage\n");
258 if (irqs2 & TWL4030_VBUSOV && __ratelimit(&bci->ratelimit))
259 dev_crit(bci->dev, "VBUS overvoltage\n");
261 if (irqs2 & TWL4030_ACCHGOV && __ratelimit(&bci->ratelimit))
262 dev_crit(bci->dev, "Ac charger overvoltage\n");
264 /* ack the interrupts */
265 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, irqs1,
266 TWL4030_INTERRUPTS_BCIISR1A);
267 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, irqs2,
268 TWL4030_INTERRUPTS_BCIISR2A);
273 static void twl4030_bci_usb_work(struct work_struct *data)
275 struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
277 switch (bci->event) {
279 case USB_EVENT_CHARGER:
280 twl4030_charger_enable_usb(bci, true);
283 twl4030_charger_enable_usb(bci, false);
288 static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
291 struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, otg_nb);
293 dev_dbg(bci->dev, "OTG notify %lu\n", val);
296 schedule_work(&bci->work);
302 * TI provided formulas:
303 * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85
304 * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7
305 * Here we use integer approximation of:
306 * CGAIN == 0: val * 1.6618 - 0.85
307 * CGAIN == 1: (val * 1.6618 - 0.85) * 2
309 static int twl4030_charger_get_current(void)
315 curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
319 ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
323 ret = (curr * 16618 - 850 * 10000) / 10;
324 if (bcictl1 & TWL4030_CGAIN)
331 * Returns the main charge FSM state
334 static int twl4030bci_state(struct twl4030_bci *bci)
339 ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
341 pr_err("twl4030_bci: error reading BCIMSTATEC\n");
345 dev_dbg(bci->dev, "state: %02x\n", state);
350 static int twl4030_bci_state_to_status(int state)
352 state &= TWL4030_MSTATEC_MASK;
353 if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
354 return POWER_SUPPLY_STATUS_CHARGING;
355 else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
356 state <= TWL4030_MSTATEC_COMPLETE4)
357 return POWER_SUPPLY_STATUS_FULL;
359 return POWER_SUPPLY_STATUS_NOT_CHARGING;
362 static int twl4030_bci_get_property(struct power_supply *psy,
363 enum power_supply_property psp,
364 union power_supply_propval *val)
366 struct twl4030_bci *bci = dev_get_drvdata(psy->dev->parent);
371 state = twl4030bci_state(bci);
375 if (psy->type == POWER_SUPPLY_TYPE_USB)
376 is_charging = state & TWL4030_MSTATEC_USB;
378 is_charging = state & TWL4030_MSTATEC_AC;
381 case POWER_SUPPLY_PROP_STATUS:
383 val->intval = twl4030_bci_state_to_status(state);
385 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
387 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
388 /* charging must be active for meaningful result */
391 if (psy->type == POWER_SUPPLY_TYPE_USB) {
392 ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
395 /* BCIVBUS uses ADCIN8, 7/1023 V/step */
396 val->intval = ret * 6843;
398 ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
401 /* BCIVAC uses ADCIN11, 10/1023 V/step */
402 val->intval = ret * 9775;
405 case POWER_SUPPLY_PROP_CURRENT_NOW:
408 /* current measurement is shared between AC and USB */
409 ret = twl4030_charger_get_current();
414 case POWER_SUPPLY_PROP_ONLINE:
415 val->intval = is_charging &&
416 twl4030_bci_state_to_status(state) !=
417 POWER_SUPPLY_STATUS_NOT_CHARGING;
426 static enum power_supply_property twl4030_charger_props[] = {
427 POWER_SUPPLY_PROP_STATUS,
428 POWER_SUPPLY_PROP_ONLINE,
429 POWER_SUPPLY_PROP_VOLTAGE_NOW,
430 POWER_SUPPLY_PROP_CURRENT_NOW,
433 static int __init twl4030_bci_probe(struct platform_device *pdev)
435 struct twl4030_bci *bci;
439 bci = kzalloc(sizeof(*bci), GFP_KERNEL);
443 bci->dev = &pdev->dev;
444 bci->irq_chg = platform_get_irq(pdev, 0);
445 bci->irq_bci = platform_get_irq(pdev, 1);
447 platform_set_drvdata(pdev, bci);
449 ratelimit_state_init(&bci->ratelimit, HZ, 2);
451 bci->ac.name = "twl4030_ac";
452 bci->ac.type = POWER_SUPPLY_TYPE_MAINS;
453 bci->ac.properties = twl4030_charger_props;
454 bci->ac.num_properties = ARRAY_SIZE(twl4030_charger_props);
455 bci->ac.get_property = twl4030_bci_get_property;
457 ret = power_supply_register(&pdev->dev, &bci->ac);
459 dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
460 goto fail_register_ac;
463 bci->usb.name = "twl4030_usb";
464 bci->usb.type = POWER_SUPPLY_TYPE_USB;
465 bci->usb.properties = twl4030_charger_props;
466 bci->usb.num_properties = ARRAY_SIZE(twl4030_charger_props);
467 bci->usb.get_property = twl4030_bci_get_property;
469 ret = power_supply_register(&pdev->dev, &bci->usb);
471 dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
472 goto fail_register_usb;
475 ret = request_threaded_irq(bci->irq_chg, NULL,
476 twl4030_charger_interrupt, 0, pdev->name, bci);
478 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
483 ret = request_threaded_irq(bci->irq_bci, NULL,
484 twl4030_bci_interrupt, 0, pdev->name, bci);
486 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
491 INIT_WORK(&bci->work, twl4030_bci_usb_work);
493 bci->transceiver = otg_get_transceiver();
494 if (bci->transceiver != NULL) {
495 bci->otg_nb.notifier_call = twl4030_bci_usb_ncb;
496 otg_register_notifier(bci->transceiver, &bci->otg_nb);
499 /* Enable interrupts now. */
500 reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 |
501 TWL4030_TBATOR1 | TWL4030_BATSTS);
502 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
503 TWL4030_INTERRUPTS_BCIIMR1A);
505 dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
506 goto fail_unmask_interrupts;
509 reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV);
510 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
511 TWL4030_INTERRUPTS_BCIIMR2A);
513 dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
515 twl4030_charger_enable_ac(true);
516 twl4030_charger_enable_usb(bci, true);
520 fail_unmask_interrupts:
521 if (bci->transceiver != NULL) {
522 otg_unregister_notifier(bci->transceiver, &bci->otg_nb);
523 otg_put_transceiver(bci->transceiver);
525 free_irq(bci->irq_bci, bci);
527 free_irq(bci->irq_chg, bci);
529 power_supply_unregister(&bci->usb);
531 power_supply_unregister(&bci->ac);
533 platform_set_drvdata(pdev, NULL);
539 static int __exit twl4030_bci_remove(struct platform_device *pdev)
541 struct twl4030_bci *bci = platform_get_drvdata(pdev);
543 twl4030_charger_enable_ac(false);
544 twl4030_charger_enable_usb(bci, false);
546 /* mask interrupts */
547 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
548 TWL4030_INTERRUPTS_BCIIMR1A);
549 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
550 TWL4030_INTERRUPTS_BCIIMR2A);
552 if (bci->transceiver != NULL) {
553 otg_unregister_notifier(bci->transceiver, &bci->otg_nb);
554 otg_put_transceiver(bci->transceiver);
556 free_irq(bci->irq_bci, bci);
557 free_irq(bci->irq_chg, bci);
558 power_supply_unregister(&bci->usb);
559 power_supply_unregister(&bci->ac);
560 platform_set_drvdata(pdev, NULL);
566 static struct platform_driver twl4030_bci_driver = {
568 .name = "twl4030_bci",
569 .owner = THIS_MODULE,
571 .remove = __exit_p(twl4030_bci_remove),
574 static int __init twl4030_bci_init(void)
576 return platform_driver_probe(&twl4030_bci_driver, twl4030_bci_probe);
578 module_init(twl4030_bci_init);
580 static void __exit twl4030_bci_exit(void)
582 platform_driver_unregister(&twl4030_bci_driver);
584 module_exit(twl4030_bci_exit);
586 MODULE_AUTHOR("Gražvydas Ignotas");
587 MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
588 MODULE_LICENSE("GPL");
589 MODULE_ALIAS("platform:twl4030_bci");