1 /*
2 * Battery driver for wm8350 PMIC
3 *
4 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
5 *
6 * Based on OLPC Battery Driver
7 *
8 * Copyright 2006 David Woodhouse <dwmw2@infradead.org>
9 *
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.
13 */
14
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>
22
wm8350_read_battery_uvolts(struct wm8350 * wm8350)23 static int wm8350_read_battery_uvolts(struct wm8350 *wm8350)
24 {
25 return wm8350_read_auxadc(wm8350, WM8350_AUXADC_BATT, 0, 0)
26 * WM8350_AUX_COEFF;
27 }
28
wm8350_read_line_uvolts(struct wm8350 * wm8350)29 static int wm8350_read_line_uvolts(struct wm8350 *wm8350)
30 {
31 return wm8350_read_auxadc(wm8350, WM8350_AUXADC_LINE, 0, 0)
32 * WM8350_AUX_COEFF;
33 }
34
wm8350_read_usb_uvolts(struct wm8350 * wm8350)35 static int wm8350_read_usb_uvolts(struct wm8350 *wm8350)
36 {
37 return wm8350_read_auxadc(wm8350, WM8350_AUXADC_USB, 0, 0)
38 * WM8350_AUX_COEFF;
39 }
40
41 #define WM8350_BATT_SUPPLY 1
42 #define WM8350_USB_SUPPLY 2
43 #define WM8350_LINE_SUPPLY 4
44
wm8350_charge_time_min(struct wm8350 * wm8350,int min)45 static inline int wm8350_charge_time_min(struct wm8350 *wm8350, int min)
46 {
47 if (!wm8350->power.rev_g_coeff)
48 return (((min - 30) / 15) & 0xf) << 8;
49 else
50 return (((min - 30) / 30) & 0xf) << 8;
51 }
52
wm8350_get_supplies(struct wm8350 * wm8350)53 static int wm8350_get_supplies(struct wm8350 *wm8350)
54 {
55 u16 sm, ov, co, chrg;
56 int supplies = 0;
57
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);
62
63 /* USB_SM */
64 sm = (sm & WM8350_USB_SM_MASK) >> WM8350_USB_SM_SHIFT;
65
66 /* CHG_ISEL */
67 chrg &= WM8350_CHG_ISEL_MASK;
68
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;
83 else
84 supplies = WM8350_BATT_SUPPLY;
85
86 return supplies;
87 }
88
wm8350_charger_config(struct wm8350 * wm8350,struct wm8350_charger_policy * policy)89 static int wm8350_charger_config(struct wm8350 *wm8350,
90 struct wm8350_charger_policy *policy)
91 {
92 u16 reg, eoc_mA, fast_limit_mA;
93
94 if (!policy) {
95 dev_warn(wm8350->dev,
96 "No charger policy, charger not configured.\n");
97 return -EINVAL;
98 }
99
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");
103 return -EINVAL;
104 }
105
106 eoc_mA = WM8350_CHG_EOC_mA(policy->eoc_mA);
107
108 wm8350_reg_unlock(wm8350);
109
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);
117
118 if (wm8350_get_supplies(wm8350) & WM8350_USB_SUPPLY) {
119 fast_limit_mA =
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));
125
126 } else {
127 fast_limit_mA =
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));
133 }
134
135 wm8350_reg_lock(wm8350);
136 return 0;
137 }
138
wm8350_batt_status(struct wm8350 * wm8350)139 static int wm8350_batt_status(struct wm8350 *wm8350)
140 {
141 u16 state;
142
143 state = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2);
144 state &= WM8350_CHG_STS_MASK;
145
146 switch (state) {
147 case WM8350_CHG_STS_OFF:
148 return POWER_SUPPLY_STATUS_DISCHARGING;
149
150 case WM8350_CHG_STS_TRICKLE:
151 case WM8350_CHG_STS_FAST:
152 return POWER_SUPPLY_STATUS_CHARGING;
153
154 default:
155 return POWER_SUPPLY_STATUS_UNKNOWN;
156 }
157 }
158
charger_state_show(struct device * dev,struct device_attribute * attr,char * buf)159 static ssize_t charger_state_show(struct device *dev,
160 struct device_attribute *attr, char *buf)
161 {
162 struct wm8350 *wm8350 = dev_get_drvdata(dev);
163 char *charge;
164 int state;
165
166 state = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2) &
167 WM8350_CHG_STS_MASK;
168 switch (state) {
169 case WM8350_CHG_STS_OFF:
170 charge = "Charger Off";
171 break;
172 case WM8350_CHG_STS_TRICKLE:
173 charge = "Trickle Charging";
174 break;
175 case WM8350_CHG_STS_FAST:
176 charge = "Fast Charging";
177 break;
178 default:
179 return 0;
180 }
181
182 return sprintf(buf, "%s\n", charge);
183 }
184
185 static DEVICE_ATTR(charger_state, 0444, charger_state_show, NULL);
186
wm8350_charger_handler(struct wm8350 * wm8350,int irq,void * data)187 static void wm8350_charger_handler(struct wm8350 *wm8350, int irq, void *data)
188 {
189 struct wm8350_power *power = &wm8350->power;
190 struct wm8350_charger_policy *policy = power->policy;
191
192 switch (irq) {
193 case WM8350_IRQ_CHG_BAT_FAIL:
194 dev_err(wm8350->dev, "battery failed\n");
195 break;
196 case WM8350_IRQ_CHG_TO:
197 dev_err(wm8350->dev, "charger timeout\n");
198 power_supply_changed(&power->battery);
199 break;
200
201 case WM8350_IRQ_CHG_BAT_HOT:
202 case WM8350_IRQ_CHG_BAT_COLD:
203 case WM8350_IRQ_CHG_START:
204 case WM8350_IRQ_CHG_END:
205 power_supply_changed(&power->battery);
206 break;
207
208 case WM8350_IRQ_CHG_FAST_RDY:
209 dev_dbg(wm8350->dev, "fast charger ready\n");
210 wm8350_charger_config(wm8350, policy);
211 wm8350_reg_unlock(wm8350);
212 wm8350_set_bits(wm8350, WM8350_BATTERY_CHARGER_CONTROL_1,
213 WM8350_CHG_FAST);
214 wm8350_reg_lock(wm8350);
215 break;
216
217 case WM8350_IRQ_CHG_VBATT_LT_3P9:
218 dev_warn(wm8350->dev, "battery < 3.9V\n");
219 break;
220 case WM8350_IRQ_CHG_VBATT_LT_3P1:
221 dev_warn(wm8350->dev, "battery < 3.1V\n");
222 break;
223 case WM8350_IRQ_CHG_VBATT_LT_2P85:
224 dev_warn(wm8350->dev, "battery < 2.85V\n");
225 break;
226
227 /* Supply change. We will overnotify but it should do
228 * no harm. */
229 case WM8350_IRQ_EXT_USB_FB:
230 case WM8350_IRQ_EXT_WALL_FB:
231 wm8350_charger_config(wm8350, policy);
232 case WM8350_IRQ_EXT_BAT_FB: /* Fall through */
233 power_supply_changed(&power->battery);
234 power_supply_changed(&power->usb);
235 power_supply_changed(&power->ac);
236 break;
237
238 default:
239 dev_err(wm8350->dev, "Unknown interrupt %d\n", irq);
240 }
241 }
242
243 /*********************************************************************
244 * AC Power
245 *********************************************************************/
wm8350_ac_get_prop(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)246 static int wm8350_ac_get_prop(struct power_supply *psy,
247 enum power_supply_property psp,
248 union power_supply_propval *val)
249 {
250 struct wm8350 *wm8350 = dev_get_drvdata(psy->dev->parent);
251 int ret = 0;
252
253 switch (psp) {
254 case POWER_SUPPLY_PROP_ONLINE:
255 val->intval = !!(wm8350_get_supplies(wm8350) &
256 WM8350_LINE_SUPPLY);
257 break;
258 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
259 val->intval = wm8350_read_line_uvolts(wm8350);
260 break;
261 default:
262 ret = -EINVAL;
263 break;
264 }
265 return ret;
266 }
267
268 static enum power_supply_property wm8350_ac_props[] = {
269 POWER_SUPPLY_PROP_ONLINE,
270 POWER_SUPPLY_PROP_VOLTAGE_NOW,
271 };
272
273 /*********************************************************************
274 * USB Power
275 *********************************************************************/
wm8350_usb_get_prop(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)276 static int wm8350_usb_get_prop(struct power_supply *psy,
277 enum power_supply_property psp,
278 union power_supply_propval *val)
279 {
280 struct wm8350 *wm8350 = dev_get_drvdata(psy->dev->parent);
281 int ret = 0;
282
283 switch (psp) {
284 case POWER_SUPPLY_PROP_ONLINE:
285 val->intval = !!(wm8350_get_supplies(wm8350) &
286 WM8350_USB_SUPPLY);
287 break;
288 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
289 val->intval = wm8350_read_usb_uvolts(wm8350);
290 break;
291 default:
292 ret = -EINVAL;
293 break;
294 }
295 return ret;
296 }
297
298 static enum power_supply_property wm8350_usb_props[] = {
299 POWER_SUPPLY_PROP_ONLINE,
300 POWER_SUPPLY_PROP_VOLTAGE_NOW,
301 };
302
303 /*********************************************************************
304 * Battery properties
305 *********************************************************************/
306
wm8350_bat_check_health(struct wm8350 * wm8350)307 static int wm8350_bat_check_health(struct wm8350 *wm8350)
308 {
309 u16 reg;
310
311 if (wm8350_read_battery_uvolts(wm8350) < 2850000)
312 return POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
313
314 reg = wm8350_reg_read(wm8350, WM8350_CHARGER_OVERRIDES);
315 if (reg & WM8350_CHG_BATT_HOT_OVRDE)
316 return POWER_SUPPLY_HEALTH_OVERHEAT;
317
318 if (reg & WM8350_CHG_BATT_COLD_OVRDE)
319 return POWER_SUPPLY_HEALTH_COLD;
320
321 return POWER_SUPPLY_HEALTH_GOOD;
322 }
323
wm8350_bat_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)324 static int wm8350_bat_get_property(struct power_supply *psy,
325 enum power_supply_property psp,
326 union power_supply_propval *val)
327 {
328 struct wm8350 *wm8350 = dev_get_drvdata(psy->dev->parent);
329 int ret = 0;
330
331 switch (psp) {
332 case POWER_SUPPLY_PROP_STATUS:
333 val->intval = wm8350_batt_status(wm8350);
334 break;
335 case POWER_SUPPLY_PROP_ONLINE:
336 val->intval = !!(wm8350_get_supplies(wm8350) &
337 WM8350_BATT_SUPPLY);
338 break;
339 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
340 val->intval = wm8350_read_battery_uvolts(wm8350);
341 break;
342 case POWER_SUPPLY_PROP_HEALTH:
343 val->intval = wm8350_bat_check_health(wm8350);
344 break;
345 default:
346 ret = -EINVAL;
347 break;
348 }
349
350 return ret;
351 }
352
353 static enum power_supply_property wm8350_bat_props[] = {
354 POWER_SUPPLY_PROP_STATUS,
355 POWER_SUPPLY_PROP_ONLINE,
356 POWER_SUPPLY_PROP_VOLTAGE_NOW,
357 POWER_SUPPLY_PROP_HEALTH,
358 };
359
360 /*********************************************************************
361 * Initialisation
362 *********************************************************************/
363
wm8350_init_charger(struct wm8350 * wm8350)364 static void wm8350_init_charger(struct wm8350 *wm8350)
365 {
366 /* register our interest in charger events */
367 wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT,
368 wm8350_charger_handler, NULL);
369 wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT);
370 wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD,
371 wm8350_charger_handler, NULL);
372 wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD);
373 wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL,
374 wm8350_charger_handler, NULL);
375 wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL);
376 wm8350_register_irq(wm8350, WM8350_IRQ_CHG_TO,
377 wm8350_charger_handler, NULL);
378 wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_TO);
379 wm8350_register_irq(wm8350, WM8350_IRQ_CHG_END,
380 wm8350_charger_handler, NULL);
381 wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_END);
382 wm8350_register_irq(wm8350, WM8350_IRQ_CHG_START,
383 wm8350_charger_handler, NULL);
384 wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_START);
385 wm8350_register_irq(wm8350, WM8350_IRQ_CHG_FAST_RDY,
386 wm8350_charger_handler, NULL);
387 wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_FAST_RDY);
388 wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9,
389 wm8350_charger_handler, NULL);
390 wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9);
391 wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1,
392 wm8350_charger_handler, NULL);
393 wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1);
394 wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85,
395 wm8350_charger_handler, NULL);
396 wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85);
397
398 /* and supply change events */
399 wm8350_register_irq(wm8350, WM8350_IRQ_EXT_USB_FB,
400 wm8350_charger_handler, NULL);
401 wm8350_unmask_irq(wm8350, WM8350_IRQ_EXT_USB_FB);
402 wm8350_register_irq(wm8350, WM8350_IRQ_EXT_WALL_FB,
403 wm8350_charger_handler, NULL);
404 wm8350_unmask_irq(wm8350, WM8350_IRQ_EXT_WALL_FB);
405 wm8350_register_irq(wm8350, WM8350_IRQ_EXT_BAT_FB,
406 wm8350_charger_handler, NULL);
407 wm8350_unmask_irq(wm8350, WM8350_IRQ_EXT_BAT_FB);
408 }
409
free_charger_irq(struct wm8350 * wm8350)410 static void free_charger_irq(struct wm8350 *wm8350)
411 {
412 wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT);
413 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT);
414 wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD);
415 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD);
416 wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL);
417 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL);
418 wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_TO);
419 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_TO);
420 wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_END);
421 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_END);
422 wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_START);
423 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_START);
424 wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9);
425 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9);
426 wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1);
427 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1);
428 wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85);
429 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85);
430 wm8350_mask_irq(wm8350, WM8350_IRQ_EXT_USB_FB);
431 wm8350_free_irq(wm8350, WM8350_IRQ_EXT_USB_FB);
432 wm8350_mask_irq(wm8350, WM8350_IRQ_EXT_WALL_FB);
433 wm8350_free_irq(wm8350, WM8350_IRQ_EXT_WALL_FB);
434 wm8350_mask_irq(wm8350, WM8350_IRQ_EXT_BAT_FB);
435 wm8350_free_irq(wm8350, WM8350_IRQ_EXT_BAT_FB);
436 }
437
wm8350_power_probe(struct platform_device * pdev)438 static __devinit int wm8350_power_probe(struct platform_device *pdev)
439 {
440 struct wm8350 *wm8350 = platform_get_drvdata(pdev);
441 struct wm8350_power *power = &wm8350->power;
442 struct wm8350_charger_policy *policy = power->policy;
443 struct power_supply *usb = &power->usb;
444 struct power_supply *battery = &power->battery;
445 struct power_supply *ac = &power->ac;
446 int ret;
447
448 ac->name = "wm8350-ac";
449 ac->type = POWER_SUPPLY_TYPE_MAINS;
450 ac->properties = wm8350_ac_props;
451 ac->num_properties = ARRAY_SIZE(wm8350_ac_props);
452 ac->get_property = wm8350_ac_get_prop;
453 ret = power_supply_register(&pdev->dev, ac);
454 if (ret)
455 return ret;
456
457 battery->name = "wm8350-battery";
458 battery->properties = wm8350_bat_props;
459 battery->num_properties = ARRAY_SIZE(wm8350_bat_props);
460 battery->get_property = wm8350_bat_get_property;
461 battery->use_for_apm = 1;
462 ret = power_supply_register(&pdev->dev, battery);
463 if (ret)
464 goto battery_failed;
465
466 usb->name = "wm8350-usb",
467 usb->type = POWER_SUPPLY_TYPE_USB;
468 usb->properties = wm8350_usb_props;
469 usb->num_properties = ARRAY_SIZE(wm8350_usb_props);
470 usb->get_property = wm8350_usb_get_prop;
471 ret = power_supply_register(&pdev->dev, usb);
472 if (ret)
473 goto usb_failed;
474
475 ret = device_create_file(&pdev->dev, &dev_attr_charger_state);
476 if (ret < 0)
477 dev_warn(wm8350->dev, "failed to add charge sysfs: %d\n", ret);
478 ret = 0;
479
480 wm8350_init_charger(wm8350);
481 if (wm8350_charger_config(wm8350, policy) == 0) {
482 wm8350_reg_unlock(wm8350);
483 wm8350_set_bits(wm8350, WM8350_POWER_MGMT_5, WM8350_CHG_ENA);
484 wm8350_reg_lock(wm8350);
485 }
486
487 return ret;
488
489 usb_failed:
490 power_supply_unregister(battery);
491 battery_failed:
492 power_supply_unregister(ac);
493
494 return ret;
495 }
496
wm8350_power_remove(struct platform_device * pdev)497 static __devexit int wm8350_power_remove(struct platform_device *pdev)
498 {
499 struct wm8350 *wm8350 = platform_get_drvdata(pdev);
500 struct wm8350_power *power = &wm8350->power;
501
502 free_charger_irq(wm8350);
503 device_remove_file(&pdev->dev, &dev_attr_charger_state);
504 power_supply_unregister(&power->battery);
505 power_supply_unregister(&power->ac);
506 power_supply_unregister(&power->usb);
507 return 0;
508 }
509
510 static struct platform_driver wm8350_power_driver = {
511 .probe = wm8350_power_probe,
512 .remove = __devexit_p(wm8350_power_remove),
513 .driver = {
514 .name = "wm8350-power",
515 },
516 };
517
wm8350_power_init(void)518 static int __init wm8350_power_init(void)
519 {
520 return platform_driver_register(&wm8350_power_driver);
521 }
522 module_init(wm8350_power_init);
523
wm8350_power_exit(void)524 static void __exit wm8350_power_exit(void)
525 {
526 platform_driver_unregister(&wm8350_power_driver);
527 }
528 module_exit(wm8350_power_exit);
529
530 MODULE_LICENSE("GPL");
531 MODULE_DESCRIPTION("Power supply driver for WM8350");
532 MODULE_ALIAS("platform:wm8350-power");
533