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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
23static 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
29static 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
35static 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
45static 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
53static 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
64 sm = (sm & WM8350_USB_SM_MASK) >> WM8350_USB_SM_SHIFT;
65
66
67 chrg &= WM8350_CHG_ISEL_MASK;
68
69
70
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
89static 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
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
139static 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
159static 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
185static DEVICE_ATTR(charger_state, 0444, charger_state_show, NULL);
186
187static irqreturn_t wm8350_charger_handler(int irq, void *data)
188{
189 struct wm8350 *wm8350 = data;
190 struct wm8350_power *power = &wm8350->power;
191 struct wm8350_charger_policy *policy = power->policy;
192
193 switch (irq - wm8350->irq_base) {
194 case WM8350_IRQ_CHG_BAT_FAIL:
195 dev_err(wm8350->dev, "battery failed\n");
196 break;
197 case WM8350_IRQ_CHG_TO:
198 dev_err(wm8350->dev, "charger timeout\n");
199 power_supply_changed(power->battery);
200 break;
201
202 case WM8350_IRQ_CHG_BAT_HOT:
203 case WM8350_IRQ_CHG_BAT_COLD:
204 case WM8350_IRQ_CHG_START:
205 case WM8350_IRQ_CHG_END:
206 power_supply_changed(power->battery);
207 break;
208
209 case WM8350_IRQ_CHG_FAST_RDY:
210 dev_dbg(wm8350->dev, "fast charger ready\n");
211 wm8350_charger_config(wm8350, policy);
212 wm8350_reg_unlock(wm8350);
213 wm8350_set_bits(wm8350, WM8350_BATTERY_CHARGER_CONTROL_1,
214 WM8350_CHG_FAST);
215 wm8350_reg_lock(wm8350);
216 break;
217
218 case WM8350_IRQ_CHG_VBATT_LT_3P9:
219 dev_warn(wm8350->dev, "battery < 3.9V\n");
220 break;
221 case WM8350_IRQ_CHG_VBATT_LT_3P1:
222 dev_warn(wm8350->dev, "battery < 3.1V\n");
223 break;
224 case WM8350_IRQ_CHG_VBATT_LT_2P85:
225 dev_warn(wm8350->dev, "battery < 2.85V\n");
226 break;
227
228
229
230 case WM8350_IRQ_EXT_USB_FB:
231 case WM8350_IRQ_EXT_WALL_FB:
232 wm8350_charger_config(wm8350, policy);
233 case WM8350_IRQ_EXT_BAT_FB:
234 power_supply_changed(power->battery);
235 power_supply_changed(power->usb);
236 power_supply_changed(power->ac);
237 break;
238
239 default:
240 dev_err(wm8350->dev, "Unknown interrupt %d\n", irq);
241 }
242
243 return IRQ_HANDLED;
244}
245
246
247
248
249static int wm8350_ac_get_prop(struct power_supply *psy,
250 enum power_supply_property psp,
251 union power_supply_propval *val)
252{
253 struct wm8350 *wm8350 = dev_get_drvdata(psy->dev.parent);
254 int ret = 0;
255
256 switch (psp) {
257 case POWER_SUPPLY_PROP_ONLINE:
258 val->intval = !!(wm8350_get_supplies(wm8350) &
259 WM8350_LINE_SUPPLY);
260 break;
261 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
262 val->intval = wm8350_read_line_uvolts(wm8350);
263 break;
264 default:
265 ret = -EINVAL;
266 break;
267 }
268 return ret;
269}
270
271static enum power_supply_property wm8350_ac_props[] = {
272 POWER_SUPPLY_PROP_ONLINE,
273 POWER_SUPPLY_PROP_VOLTAGE_NOW,
274};
275
276
277
278
279static int wm8350_usb_get_prop(struct power_supply *psy,
280 enum power_supply_property psp,
281 union power_supply_propval *val)
282{
283 struct wm8350 *wm8350 = dev_get_drvdata(psy->dev.parent);
284 int ret = 0;
285
286 switch (psp) {
287 case POWER_SUPPLY_PROP_ONLINE:
288 val->intval = !!(wm8350_get_supplies(wm8350) &
289 WM8350_USB_SUPPLY);
290 break;
291 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
292 val->intval = wm8350_read_usb_uvolts(wm8350);
293 break;
294 default:
295 ret = -EINVAL;
296 break;
297 }
298 return ret;
299}
300
301static enum power_supply_property wm8350_usb_props[] = {
302 POWER_SUPPLY_PROP_ONLINE,
303 POWER_SUPPLY_PROP_VOLTAGE_NOW,
304};
305
306
307
308
309
310static int wm8350_bat_check_health(struct wm8350 *wm8350)
311{
312 u16 reg;
313
314 if (wm8350_read_battery_uvolts(wm8350) < 2850000)
315 return POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
316
317 reg = wm8350_reg_read(wm8350, WM8350_CHARGER_OVERRIDES);
318 if (reg & WM8350_CHG_BATT_HOT_OVRDE)
319 return POWER_SUPPLY_HEALTH_OVERHEAT;
320
321 if (reg & WM8350_CHG_BATT_COLD_OVRDE)
322 return POWER_SUPPLY_HEALTH_COLD;
323
324 return POWER_SUPPLY_HEALTH_GOOD;
325}
326
327static int wm8350_bat_get_charge_type(struct wm8350 *wm8350)
328{
329 int state;
330
331 state = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2) &
332 WM8350_CHG_STS_MASK;
333 switch (state) {
334 case WM8350_CHG_STS_OFF:
335 return POWER_SUPPLY_CHARGE_TYPE_NONE;
336 case WM8350_CHG_STS_TRICKLE:
337 return POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
338 case WM8350_CHG_STS_FAST:
339 return POWER_SUPPLY_CHARGE_TYPE_FAST;
340 default:
341 return POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
342 }
343}
344
345static int wm8350_bat_get_property(struct power_supply *psy,
346 enum power_supply_property psp,
347 union power_supply_propval *val)
348{
349 struct wm8350 *wm8350 = dev_get_drvdata(psy->dev.parent);
350 int ret = 0;
351
352 switch (psp) {
353 case POWER_SUPPLY_PROP_STATUS:
354 val->intval = wm8350_batt_status(wm8350);
355 break;
356 case POWER_SUPPLY_PROP_ONLINE:
357 val->intval = !!(wm8350_get_supplies(wm8350) &
358 WM8350_BATT_SUPPLY);
359 break;
360 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
361 val->intval = wm8350_read_battery_uvolts(wm8350);
362 break;
363 case POWER_SUPPLY_PROP_HEALTH:
364 val->intval = wm8350_bat_check_health(wm8350);
365 break;
366 case POWER_SUPPLY_PROP_CHARGE_TYPE:
367 val->intval = wm8350_bat_get_charge_type(wm8350);
368 break;
369 default:
370 ret = -EINVAL;
371 break;
372 }
373
374 return ret;
375}
376
377static enum power_supply_property wm8350_bat_props[] = {
378 POWER_SUPPLY_PROP_STATUS,
379 POWER_SUPPLY_PROP_ONLINE,
380 POWER_SUPPLY_PROP_VOLTAGE_NOW,
381 POWER_SUPPLY_PROP_HEALTH,
382 POWER_SUPPLY_PROP_CHARGE_TYPE,
383};
384
385static const struct power_supply_desc wm8350_ac_desc = {
386 .name = "wm8350-ac",
387 .type = POWER_SUPPLY_TYPE_MAINS,
388 .properties = wm8350_ac_props,
389 .num_properties = ARRAY_SIZE(wm8350_ac_props),
390 .get_property = wm8350_ac_get_prop,
391};
392
393static const struct power_supply_desc wm8350_battery_desc = {
394 .name = "wm8350-battery",
395 .properties = wm8350_bat_props,
396 .num_properties = ARRAY_SIZE(wm8350_bat_props),
397 .get_property = wm8350_bat_get_property,
398 .use_for_apm = 1,
399};
400
401static const struct power_supply_desc wm8350_usb_desc = {
402 .name = "wm8350-usb",
403 .type = POWER_SUPPLY_TYPE_USB,
404 .properties = wm8350_usb_props,
405 .num_properties = ARRAY_SIZE(wm8350_usb_props),
406 .get_property = wm8350_usb_get_prop,
407};
408
409
410
411
412
413static void wm8350_init_charger(struct wm8350 *wm8350)
414{
415
416 wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT,
417 wm8350_charger_handler, 0, "Battery hot", wm8350);
418 wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD,
419 wm8350_charger_handler, 0, "Battery cold", wm8350);
420 wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL,
421 wm8350_charger_handler, 0, "Battery fail", wm8350);
422 wm8350_register_irq(wm8350, WM8350_IRQ_CHG_TO,
423 wm8350_charger_handler, 0,
424 "Charger timeout", wm8350);
425 wm8350_register_irq(wm8350, WM8350_IRQ_CHG_END,
426 wm8350_charger_handler, 0,
427 "Charge end", wm8350);
428 wm8350_register_irq(wm8350, WM8350_IRQ_CHG_START,
429 wm8350_charger_handler, 0,
430 "Charge start", wm8350);
431 wm8350_register_irq(wm8350, WM8350_IRQ_CHG_FAST_RDY,
432 wm8350_charger_handler, 0,
433 "Fast charge ready", wm8350);
434 wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9,
435 wm8350_charger_handler, 0,
436 "Battery <3.9V", wm8350);
437 wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1,
438 wm8350_charger_handler, 0,
439 "Battery <3.1V", wm8350);
440 wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85,
441 wm8350_charger_handler, 0,
442 "Battery <2.85V", wm8350);
443
444
445 wm8350_register_irq(wm8350, WM8350_IRQ_EXT_USB_FB,
446 wm8350_charger_handler, 0, "USB", wm8350);
447 wm8350_register_irq(wm8350, WM8350_IRQ_EXT_WALL_FB,
448 wm8350_charger_handler, 0, "Wall", wm8350);
449 wm8350_register_irq(wm8350, WM8350_IRQ_EXT_BAT_FB,
450 wm8350_charger_handler, 0, "Battery", wm8350);
451}
452
453static void free_charger_irq(struct wm8350 *wm8350)
454{
455 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT, wm8350);
456 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD, wm8350);
457 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL, wm8350);
458 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_TO, wm8350);
459 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_END, wm8350);
460 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_START, wm8350);
461 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9, wm8350);
462 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1, wm8350);
463 wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85, wm8350);
464 wm8350_free_irq(wm8350, WM8350_IRQ_EXT_USB_FB, wm8350);
465 wm8350_free_irq(wm8350, WM8350_IRQ_EXT_WALL_FB, wm8350);
466 wm8350_free_irq(wm8350, WM8350_IRQ_EXT_BAT_FB, wm8350);
467}
468
469static int wm8350_power_probe(struct platform_device *pdev)
470{
471 struct wm8350 *wm8350 = platform_get_drvdata(pdev);
472 struct wm8350_power *power = &wm8350->power;
473 struct wm8350_charger_policy *policy = power->policy;
474 int ret;
475
476 power->ac = power_supply_register(&pdev->dev, &wm8350_ac_desc, NULL);
477 if (IS_ERR(power->ac))
478 return PTR_ERR(power->ac);
479
480 power->battery = power_supply_register(&pdev->dev, &wm8350_battery_desc,
481 NULL);
482 if (IS_ERR(power->battery)) {
483 ret = PTR_ERR(power->battery);
484 goto battery_failed;
485 }
486
487 power->usb = power_supply_register(&pdev->dev, &wm8350_usb_desc, NULL);
488 if (IS_ERR(power->usb)) {
489 ret = PTR_ERR(power->usb);
490 goto usb_failed;
491 }
492
493 ret = device_create_file(&pdev->dev, &dev_attr_charger_state);
494 if (ret < 0)
495 dev_warn(wm8350->dev, "failed to add charge sysfs: %d\n", ret);
496 ret = 0;
497
498 wm8350_init_charger(wm8350);
499 if (wm8350_charger_config(wm8350, policy) == 0) {
500 wm8350_reg_unlock(wm8350);
501 wm8350_set_bits(wm8350, WM8350_POWER_MGMT_5, WM8350_CHG_ENA);
502 wm8350_reg_lock(wm8350);
503 }
504
505 return ret;
506
507usb_failed:
508 power_supply_unregister(power->battery);
509battery_failed:
510 power_supply_unregister(power->ac);
511
512 return ret;
513}
514
515static int wm8350_power_remove(struct platform_device *pdev)
516{
517 struct wm8350 *wm8350 = platform_get_drvdata(pdev);
518 struct wm8350_power *power = &wm8350->power;
519
520 free_charger_irq(wm8350);
521 device_remove_file(&pdev->dev, &dev_attr_charger_state);
522 power_supply_unregister(power->battery);
523 power_supply_unregister(power->ac);
524 power_supply_unregister(power->usb);
525 return 0;
526}
527
528static struct platform_driver wm8350_power_driver = {
529 .probe = wm8350_power_probe,
530 .remove = wm8350_power_remove,
531 .driver = {
532 .name = "wm8350-power",
533 },
534};
535
536module_platform_driver(wm8350_power_driver);
537
538MODULE_LICENSE("GPL");
539MODULE_DESCRIPTION("Power supply driver for WM8350");
540MODULE_ALIAS("platform:wm8350-power");
541
