2 * Battery driver for wm8350 PMIC
4 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
6 * Based on OLPC Battery Driver
8 * Copyright 2006 David Woodhouse <dwmw2@infradead.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
15 #include <linux/module.h>
16 #include <linux/err.h>
17 #include <linux/platform_device.h>
18 #include <linux/power_supply.h>
19 #include <linux/mfd/wm8350/supply.h>
20 #include <linux/mfd/wm8350/core.h>
21 #include <linux/mfd/wm8350/comparator.h>
23 static int wm8350_read_battery_uvolts(struct wm8350 *wm8350)
25 return wm8350_read_auxadc(wm8350, WM8350_AUXADC_BATT, 0, 0)
29 static int wm8350_read_line_uvolts(struct wm8350 *wm8350)
31 return wm8350_read_auxadc(wm8350, WM8350_AUXADC_LINE, 0, 0)
35 static int wm8350_read_usb_uvolts(struct wm8350 *wm8350)
37 return wm8350_read_auxadc(wm8350, WM8350_AUXADC_USB, 0, 0)
41 #define WM8350_BATT_SUPPLY 1
42 #define WM8350_USB_SUPPLY 2
43 #define WM8350_LINE_SUPPLY 4
45 static inline int wm8350_charge_time_min(struct wm8350 *wm8350, int min)
47 if (!wm8350->power.rev_g_coeff)
48 return (((min - 30) / 15) & 0xf) << 8;
50 return (((min - 30) / 30) & 0xf) << 8;
53 static int wm8350_get_supplies(struct wm8350 *wm8350)
58 sm = wm8350_reg_read(wm8350, WM8350_STATE_MACHINE_STATUS);
59 ov = wm8350_reg_read(wm8350, WM8350_MISC_OVERRIDES);
60 co = wm8350_reg_read(wm8350, WM8350_COMPARATOR_OVERRIDES);
61 chrg = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2);
64 sm = (sm & WM8350_USB_SM_MASK) >> WM8350_USB_SM_SHIFT;
67 chrg &= WM8350_CHG_ISEL_MASK;
69 /* If the USB state machine is active then we're using that with or
70 * without battery, otherwise check for wall supply */
71 if (((sm == WM8350_USB_SM_100_SLV) ||
72 (sm == WM8350_USB_SM_500_SLV) ||
73 (sm == WM8350_USB_SM_STDBY_SLV))
74 && !(ov & WM8350_USB_LIMIT_OVRDE))
75 supplies = WM8350_USB_SUPPLY;
76 else if (((sm == WM8350_USB_SM_100_SLV) ||
77 (sm == WM8350_USB_SM_500_SLV) ||
78 (sm == WM8350_USB_SM_STDBY_SLV))
79 && (ov & WM8350_USB_LIMIT_OVRDE) && (chrg == 0))
80 supplies = WM8350_USB_SUPPLY | WM8350_BATT_SUPPLY;
81 else if (co & WM8350_WALL_FB_OVRDE)
82 supplies = WM8350_LINE_SUPPLY;
84 supplies = WM8350_BATT_SUPPLY;
89 static int wm8350_charger_config(struct wm8350 *wm8350,
90 struct wm8350_charger_policy *policy)
92 u16 reg, eoc_mA, fast_limit_mA;
96 "No charger policy, charger not configured.\n");
100 /* make sure USB fast charge current is not > 500mA */
101 if (policy->fast_limit_USB_mA > 500) {
102 dev_err(wm8350->dev, "USB fast charge > 500mA\n");
106 eoc_mA = WM8350_CHG_EOC_mA(policy->eoc_mA);
108 wm8350_reg_unlock(wm8350);
110 reg = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_1)
111 & WM8350_CHG_ENA_R168;
112 wm8350_reg_write(wm8350, WM8350_BATTERY_CHARGER_CONTROL_1,
113 reg | eoc_mA | policy->trickle_start_mV |
114 WM8350_CHG_TRICKLE_TEMP_CHOKE |
115 WM8350_CHG_TRICKLE_USB_CHOKE |
116 WM8350_CHG_FAST_USB_THROTTLE);
118 if (wm8350_get_supplies(wm8350) & WM8350_USB_SUPPLY) {
120 WM8350_CHG_FAST_LIMIT_mA(policy->fast_limit_USB_mA);
121 wm8350_reg_write(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2,
122 policy->charge_mV | policy->trickle_charge_USB_mA |
123 fast_limit_mA | wm8350_charge_time_min(wm8350,
124 policy->charge_timeout));
128 WM8350_CHG_FAST_LIMIT_mA(policy->fast_limit_mA);
129 wm8350_reg_write(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2,
130 policy->charge_mV | policy->trickle_charge_mA |
131 fast_limit_mA | wm8350_charge_time_min(wm8350,
132 policy->charge_timeout));
135 wm8350_reg_lock(wm8350);
139 static int wm8350_batt_status(struct wm8350 *wm8350)
143 state = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2);
144 state &= WM8350_CHG_STS_MASK;
147 case WM8350_CHG_STS_OFF:
148 return POWER_SUPPLY_STATUS_DISCHARGING;
150 case WM8350_CHG_STS_TRICKLE:
151 case WM8350_CHG_STS_FAST:
152 return POWER_SUPPLY_STATUS_CHARGING;
155 return POWER_SUPPLY_STATUS_UNKNOWN;
159 static ssize_t charger_state_show(struct device *dev,
160 struct device_attribute *attr, char *buf)
162 struct wm8350 *wm8350 = dev_get_drvdata(dev);
166 state = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2) &
169 case WM8350_CHG_STS_OFF:
170 charge = "Charger Off";
172 case WM8350_CHG_STS_TRICKLE:
173 charge = "Trickle Charging";
175 case WM8350_CHG_STS_FAST:
176 charge = "Fast Charging";
182 return sprintf(buf, "%s\n", charge);
185 static DEVICE_ATTR(charger_state, 0444, charger_state_show, NULL);
187 static void wm8350_charger_handler(struct wm8350 *wm8350, int irq, void *data)
189 struct wm8350_power *power = &wm8350->power;
190 struct wm8350_charger_policy *policy = power->policy;
193 case WM8350_IRQ_CHG_BAT_HOT:
194 dev_err(wm8350->dev, "battery too hot\n");
196 case WM8350_IRQ_CHG_BAT_COLD:
197 dev_err(wm8350->dev, "battery too cold\n");
199 case WM8350_IRQ_CHG_BAT_FAIL:
200 dev_err(wm8350->dev, "battery failed\n");
202 case WM8350_IRQ_CHG_TO:
203 dev_err(wm8350->dev, "charger timeout\n");
205 case WM8350_IRQ_CHG_END:
206 power_supply_changed(&power->battery);
208 case WM8350_IRQ_CHG_START:
209 power_supply_changed(&power->battery);
212 case WM8350_IRQ_CHG_FAST_RDY:
213 dev_dbg(wm8350->dev, "fast charger ready\n");
214 wm8350_charger_config(wm8350, policy);
215 wm8350_reg_unlock(wm8350);
216 wm8350_set_bits(wm8350, WM8350_BATTERY_CHARGER_CONTROL_1,
218 wm8350_reg_lock(wm8350);
221 case WM8350_IRQ_CHG_VBATT_LT_3P9:
222 dev_warn(wm8350->dev, "battery < 3.9V\n");
224 case WM8350_IRQ_CHG_VBATT_LT_3P1:
225 dev_warn(wm8350->dev, "battery < 3.1V\n");
227 case WM8350_IRQ_CHG_VBATT_LT_2P85:
228 dev_warn(wm8350->dev, "battery < 2.85V\n");
231 /* Supply change. We will overnotify but it should do
233 case WM8350_IRQ_EXT_USB_FB:
234 case WM8350_IRQ_EXT_WALL_FB:
235 wm8350_charger_config(wm8350, policy);
236 case WM8350_IRQ_EXT_BAT_FB: /* Fall through */
237 power_supply_changed(&power->battery);
238 power_supply_changed(&power->usb);
239 power_supply_changed(&power->ac);
243 dev_err(wm8350->dev, "Unknown interrupt %d\n", irq);
247 /*********************************************************************
249 *********************************************************************/
250 static int wm8350_ac_get_prop(struct power_supply *psy,
251 enum power_supply_property psp,
252 union power_supply_propval *val)
254 struct wm8350 *wm8350 = dev_get_drvdata(psy->dev->parent);
258 case POWER_SUPPLY_PROP_ONLINE:
259 val->intval = !!(wm8350_get_supplies(wm8350) &
262 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
263 val->intval = wm8350_read_line_uvolts(wm8350);
272 static enum power_supply_property wm8350_ac_props[] = {
273 POWER_SUPPLY_PROP_ONLINE,
274 POWER_SUPPLY_PROP_VOLTAGE_NOW,
277 /*********************************************************************
279 *********************************************************************/
280 static int wm8350_usb_get_prop(struct power_supply *psy,
281 enum power_supply_property psp,
282 union power_supply_propval *val)
284 struct wm8350 *wm8350 = dev_get_drvdata(psy->dev->parent);
288 case POWER_SUPPLY_PROP_ONLINE:
289 val->intval = !!(wm8350_get_supplies(wm8350) &
292 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
293 val->intval = wm8350_read_usb_uvolts(wm8350);
302 static enum power_supply_property wm8350_usb_props[] = {
303 POWER_SUPPLY_PROP_ONLINE,
304 POWER_SUPPLY_PROP_VOLTAGE_NOW,
307 /*********************************************************************
309 *********************************************************************/
311 static int wm8350_bat_get_property(struct power_supply *psy,
312 enum power_supply_property psp,
313 union power_supply_propval *val)
315 struct wm8350 *wm8350 = dev_get_drvdata(psy->dev->parent);
319 case POWER_SUPPLY_PROP_STATUS:
320 val->intval = wm8350_batt_status(wm8350);
322 case POWER_SUPPLY_PROP_ONLINE:
323 val->intval = !!(wm8350_get_supplies(wm8350) &
326 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
327 val->intval = wm8350_read_battery_uvolts(wm8350);
337 static enum power_supply_property wm8350_bat_props[] = {
338 POWER_SUPPLY_PROP_STATUS,
339 POWER_SUPPLY_PROP_ONLINE,
340 POWER_SUPPLY_PROP_VOLTAGE_NOW,
343 /*********************************************************************
345 *********************************************************************/
347 static void wm8350_init_charger(struct wm8350 *wm8350)
349 /* register our interest in charger events */
350 wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT,
351 wm8350_charger_handler, NULL);
352 wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT);
353 wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD,
354 wm8350_charger_handler, NULL);
355 wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD);
356 wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL,
357 wm8350_charger_handler, NULL);
358 wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL);
359 wm8350_register_irq(wm8350, WM8350_IRQ_CHG_TO,
360 wm8350_charger_handler, NULL);
361 wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_TO);
362 wm8350_register_irq(wm8350, WM8350_IRQ_CHG_END,
363 wm8350_charger_handler, NULL);
364 wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_END);
365 wm8350_register_irq(wm8350, WM8350_IRQ_CHG_START,
366 wm8350_charger_handler, NULL);
367 wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_START);
368 wm8350_register_irq(wm8350, WM8350_IRQ_CHG_FAST_RDY,
369 wm8350_charger_handler, NULL);
370 wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_FAST_RDY);
371 wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9,
372 wm8350_charger_handler, NULL);
373 wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9);
374 wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1,
375 wm8350_charger_handler, NULL);
376 wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1);
377 wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85,
378 wm8350_charger_handler, NULL);
379 wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85);
381 /* and supply change events */
382 wm8350_register_irq(wm8350, WM8350_IRQ_EXT_USB_FB,
383 wm8350_charger_handler, NULL);
384 wm8350_unmask_irq(wm8350, WM8350_IRQ_EXT_USB_FB);
385 wm8350_register_irq(wm8350, WM8350_IRQ_EXT_WALL_FB,
386 wm8350_charger_handler, NULL);
387 wm8350_unmask_irq(wm8350, WM8350_IRQ_EXT_WALL_FB);
388 wm8350_register_irq(wm8350, WM8350_IRQ_EXT_BAT_FB,
389 wm8350_charger_handler, NULL);
390 wm8350_unmask_irq(wm8350, WM8350_IRQ_EXT_BAT_FB);
393 static void free_charger_irq(struct wm8350 *wm8350)
395 wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT);
396 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT);
397 wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD);
398 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD);
399 wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL);
400 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL);
401 wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_TO);
402 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_TO);
403 wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_END);
404 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_END);
405 wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_START);
406 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_START);
407 wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9);
408 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9);
409 wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1);
410 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1);
411 wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85);
412 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85);
413 wm8350_mask_irq(wm8350, WM8350_IRQ_EXT_USB_FB);
414 wm8350_free_irq(wm8350, WM8350_IRQ_EXT_USB_FB);
415 wm8350_mask_irq(wm8350, WM8350_IRQ_EXT_WALL_FB);
416 wm8350_free_irq(wm8350, WM8350_IRQ_EXT_WALL_FB);
417 wm8350_mask_irq(wm8350, WM8350_IRQ_EXT_BAT_FB);
418 wm8350_free_irq(wm8350, WM8350_IRQ_EXT_BAT_FB);
421 static __devinit int wm8350_power_probe(struct platform_device *pdev)
423 struct wm8350 *wm8350 = platform_get_drvdata(pdev);
424 struct wm8350_power *power = &wm8350->power;
425 struct wm8350_charger_policy *policy = power->policy;
426 struct power_supply *usb = &power->usb;
427 struct power_supply *battery = &power->battery;
428 struct power_supply *ac = &power->ac;
431 ac->name = "wm8350-ac";
432 ac->type = POWER_SUPPLY_TYPE_MAINS;
433 ac->properties = wm8350_ac_props;
434 ac->num_properties = ARRAY_SIZE(wm8350_ac_props);
435 ac->get_property = wm8350_ac_get_prop;
436 ret = power_supply_register(&pdev->dev, ac);
440 battery->name = "wm8350-battery";
441 battery->properties = wm8350_bat_props;
442 battery->num_properties = ARRAY_SIZE(wm8350_bat_props);
443 battery->get_property = wm8350_bat_get_property;
444 battery->use_for_apm = 1;
445 ret = power_supply_register(&pdev->dev, battery);
449 usb->name = "wm8350-usb",
450 usb->type = POWER_SUPPLY_TYPE_USB;
451 usb->properties = wm8350_usb_props;
452 usb->num_properties = ARRAY_SIZE(wm8350_usb_props);
453 usb->get_property = wm8350_usb_get_prop;
454 ret = power_supply_register(&pdev->dev, usb);
458 ret = device_create_file(&pdev->dev, &dev_attr_charger_state);
460 dev_warn(wm8350->dev, "failed to add charge sysfs: %d\n", ret);
463 wm8350_init_charger(wm8350);
464 if (wm8350_charger_config(wm8350, policy) == 0) {
465 wm8350_reg_unlock(wm8350);
466 wm8350_set_bits(wm8350, WM8350_POWER_MGMT_5, WM8350_CHG_ENA);
467 wm8350_reg_lock(wm8350);
473 power_supply_unregister(battery);
475 power_supply_unregister(ac);
480 static __devexit int wm8350_power_remove(struct platform_device *pdev)
482 struct wm8350 *wm8350 = platform_get_drvdata(pdev);
483 struct wm8350_power *power = &wm8350->power;
485 free_charger_irq(wm8350);
486 device_remove_file(&pdev->dev, &dev_attr_charger_state);
487 power_supply_unregister(&power->battery);
488 power_supply_unregister(&power->ac);
489 power_supply_unregister(&power->usb);
493 static struct platform_driver wm8350_power_driver = {
494 .probe = wm8350_power_probe,
495 .remove = __devexit_p(wm8350_power_remove),
497 .name = "wm8350-power",
501 static int __init wm8350_power_init(void)
503 return platform_driver_register(&wm8350_power_driver);
505 module_init(wm8350_power_init);
507 static void __exit wm8350_power_exit(void)
509 platform_driver_unregister(&wm8350_power_driver);
511 module_exit(wm8350_power_exit);
513 MODULE_LICENSE("GPL");
514 MODULE_DESCRIPTION("Power supply driver for WM8350");
515 MODULE_ALIAS("platform:wm8350-power");