1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * axp288_charger.c - X-power AXP288 PMIC Charger driver
4 *
5 * Copyright (C) 2016-2017 Hans de Goede <hdegoede@redhat.com>
6 * Copyright (C) 2014 Intel Corporation
7 * Author: Ramakrishna Pallala <ramakrishna.pallala@intel.com>
8 */
9
10 #include <linux/acpi.h>
11 #include <linux/bitops.h>
12 #include <linux/module.h>
13 #include <linux/device.h>
14 #include <linux/regmap.h>
15 #include <linux/workqueue.h>
16 #include <linux/delay.h>
17 #include <linux/platform_device.h>
18 #include <linux/usb/otg.h>
19 #include <linux/notifier.h>
20 #include <linux/power_supply.h>
21 #include <linux/property.h>
22 #include <linux/mfd/axp20x.h>
23 #include <linux/extcon.h>
24 #include <linux/dmi.h>
25
26 #define PS_STAT_VBUS_TRIGGER BIT(0)
27 #define PS_STAT_BAT_CHRG_DIR BIT(2)
28 #define PS_STAT_VBAT_ABOVE_VHOLD BIT(3)
29 #define PS_STAT_VBUS_VALID BIT(4)
30 #define PS_STAT_VBUS_PRESENT BIT(5)
31
32 #define CHRG_STAT_BAT_SAFE_MODE BIT(3)
33 #define CHRG_STAT_BAT_VALID BIT(4)
34 #define CHRG_STAT_BAT_PRESENT BIT(5)
35 #define CHRG_STAT_CHARGING BIT(6)
36 #define CHRG_STAT_PMIC_OTP BIT(7)
37
38 #define VBUS_ISPOUT_CUR_LIM_MASK 0x03
39 #define VBUS_ISPOUT_CUR_LIM_BIT_POS 0
40 #define VBUS_ISPOUT_CUR_LIM_900MA 0x0 /* 900mA */
41 #define VBUS_ISPOUT_CUR_LIM_1500MA 0x1 /* 1500mA */
42 #define VBUS_ISPOUT_CUR_LIM_2000MA 0x2 /* 2000mA */
43 #define VBUS_ISPOUT_CUR_NO_LIM 0x3 /* 2500mA */
44 #define VBUS_ISPOUT_VHOLD_SET_MASK 0x31
45 #define VBUS_ISPOUT_VHOLD_SET_BIT_POS 0x3
46 #define VBUS_ISPOUT_VHOLD_SET_OFFSET 4000 /* 4000mV */
47 #define VBUS_ISPOUT_VHOLD_SET_LSB_RES 100 /* 100mV */
48 #define VBUS_ISPOUT_VHOLD_SET_4300MV 0x3 /* 4300mV */
49 #define VBUS_ISPOUT_VBUS_PATH_DIS BIT(7)
50
51 #define CHRG_CCCV_CC_MASK 0xf /* 4 bits */
52 #define CHRG_CCCV_CC_BIT_POS 0
53 #define CHRG_CCCV_CC_OFFSET 200 /* 200mA */
54 #define CHRG_CCCV_CC_LSB_RES 200 /* 200mA */
55 #define CHRG_CCCV_ITERM_20P BIT(4) /* 20% of CC */
56 #define CHRG_CCCV_CV_MASK 0x60 /* 2 bits */
57 #define CHRG_CCCV_CV_BIT_POS 5
58 #define CHRG_CCCV_CV_4100MV 0x0 /* 4.10V */
59 #define CHRG_CCCV_CV_4150MV 0x1 /* 4.15V */
60 #define CHRG_CCCV_CV_4200MV 0x2 /* 4.20V */
61 #define CHRG_CCCV_CV_4350MV 0x3 /* 4.35V */
62 #define CHRG_CCCV_CHG_EN BIT(7)
63
64 #define CNTL2_CC_TIMEOUT_MASK 0x3 /* 2 bits */
65 #define CNTL2_CC_TIMEOUT_OFFSET 6 /* 6 Hrs */
66 #define CNTL2_CC_TIMEOUT_LSB_RES 2 /* 2 Hrs */
67 #define CNTL2_CC_TIMEOUT_12HRS 0x3 /* 12 Hrs */
68 #define CNTL2_CHGLED_TYPEB BIT(4)
69 #define CNTL2_CHG_OUT_TURNON BIT(5)
70 #define CNTL2_PC_TIMEOUT_MASK 0xC0
71 #define CNTL2_PC_TIMEOUT_OFFSET 40 /* 40 mins */
72 #define CNTL2_PC_TIMEOUT_LSB_RES 10 /* 10 mins */
73 #define CNTL2_PC_TIMEOUT_70MINS 0x3
74
75 #define CHRG_ILIM_TEMP_LOOP_EN BIT(3)
76 #define CHRG_VBUS_ILIM_MASK 0xf0
77 #define CHRG_VBUS_ILIM_BIT_POS 4
78 #define CHRG_VBUS_ILIM_100MA 0x0 /* 100mA */
79 #define CHRG_VBUS_ILIM_500MA 0x1 /* 500mA */
80 #define CHRG_VBUS_ILIM_900MA 0x2 /* 900mA */
81 #define CHRG_VBUS_ILIM_1500MA 0x3 /* 1500mA */
82 #define CHRG_VBUS_ILIM_2000MA 0x4 /* 2000mA */
83 #define CHRG_VBUS_ILIM_2500MA 0x5 /* 2500mA */
84 #define CHRG_VBUS_ILIM_3000MA 0x6 /* 3000mA */
85 #define CHRG_VBUS_ILIM_3500MA 0x7 /* 3500mA */
86 #define CHRG_VBUS_ILIM_4000MA 0x8 /* 4000mA */
87
88 #define CHRG_VLTFC_0C 0xA5 /* 0 DegC */
89 #define CHRG_VHTFC_45C 0x1F /* 45 DegC */
90
91 #define FG_CNTL_OCV_ADJ_EN BIT(3)
92
93 #define CV_4100MV 4100 /* 4100mV */
94 #define CV_4150MV 4150 /* 4150mV */
95 #define CV_4200MV 4200 /* 4200mV */
96 #define CV_4350MV 4350 /* 4350mV */
97
98 #define AXP288_EXTCON_DEV_NAME "axp288_extcon"
99 #define USB_HOST_EXTCON_HID "INT3496"
100 #define USB_HOST_EXTCON_NAME "INT3496:00"
101
102 enum {
103 VBUS_OV_IRQ = 0,
104 CHARGE_DONE_IRQ,
105 CHARGE_CHARGING_IRQ,
106 BAT_SAFE_QUIT_IRQ,
107 BAT_SAFE_ENTER_IRQ,
108 QCBTU_IRQ,
109 CBTU_IRQ,
110 QCBTO_IRQ,
111 CBTO_IRQ,
112 CHRG_INTR_END,
113 };
114
115 struct axp288_chrg_info {
116 struct platform_device *pdev;
117 struct regmap *regmap;
118 struct regmap_irq_chip_data *regmap_irqc;
119 int irq[CHRG_INTR_END];
120 struct power_supply *psy_usb;
121
122 /* OTG/Host mode */
123 struct {
124 struct work_struct work;
125 struct extcon_dev *cable;
126 struct notifier_block id_nb;
127 bool id_short;
128 } otg;
129
130 /* SDP/CDP/DCP USB charging cable notifications */
131 struct {
132 struct extcon_dev *edev;
133 struct notifier_block nb;
134 struct work_struct work;
135 } cable;
136
137 int cc;
138 int cv;
139 int max_cc;
140 int max_cv;
141 };
142
axp288_charger_set_cc(struct axp288_chrg_info * info,int cc)143 static inline int axp288_charger_set_cc(struct axp288_chrg_info *info, int cc)
144 {
145 u8 reg_val;
146 int ret;
147
148 if (cc < CHRG_CCCV_CC_OFFSET)
149 cc = CHRG_CCCV_CC_OFFSET;
150 else if (cc > info->max_cc)
151 cc = info->max_cc;
152
153 reg_val = (cc - CHRG_CCCV_CC_OFFSET) / CHRG_CCCV_CC_LSB_RES;
154 cc = (reg_val * CHRG_CCCV_CC_LSB_RES) + CHRG_CCCV_CC_OFFSET;
155 reg_val = reg_val << CHRG_CCCV_CC_BIT_POS;
156
157 ret = regmap_update_bits(info->regmap,
158 AXP20X_CHRG_CTRL1,
159 CHRG_CCCV_CC_MASK, reg_val);
160 if (ret >= 0)
161 info->cc = cc;
162
163 return ret;
164 }
165
axp288_charger_set_cv(struct axp288_chrg_info * info,int cv)166 static inline int axp288_charger_set_cv(struct axp288_chrg_info *info, int cv)
167 {
168 u8 reg_val;
169 int ret;
170
171 if (cv <= CV_4100MV) {
172 reg_val = CHRG_CCCV_CV_4100MV;
173 cv = CV_4100MV;
174 } else if (cv <= CV_4150MV) {
175 reg_val = CHRG_CCCV_CV_4150MV;
176 cv = CV_4150MV;
177 } else if (cv <= CV_4200MV) {
178 reg_val = CHRG_CCCV_CV_4200MV;
179 cv = CV_4200MV;
180 } else {
181 reg_val = CHRG_CCCV_CV_4350MV;
182 cv = CV_4350MV;
183 }
184
185 reg_val = reg_val << CHRG_CCCV_CV_BIT_POS;
186
187 ret = regmap_update_bits(info->regmap,
188 AXP20X_CHRG_CTRL1,
189 CHRG_CCCV_CV_MASK, reg_val);
190
191 if (ret >= 0)
192 info->cv = cv;
193
194 return ret;
195 }
196
axp288_charger_get_vbus_inlmt(struct axp288_chrg_info * info)197 static int axp288_charger_get_vbus_inlmt(struct axp288_chrg_info *info)
198 {
199 unsigned int val;
200 int ret;
201
202 ret = regmap_read(info->regmap, AXP20X_CHRG_BAK_CTRL, &val);
203 if (ret < 0)
204 return ret;
205
206 val >>= CHRG_VBUS_ILIM_BIT_POS;
207 switch (val) {
208 case CHRG_VBUS_ILIM_100MA:
209 return 100000;
210 case CHRG_VBUS_ILIM_500MA:
211 return 500000;
212 case CHRG_VBUS_ILIM_900MA:
213 return 900000;
214 case CHRG_VBUS_ILIM_1500MA:
215 return 1500000;
216 case CHRG_VBUS_ILIM_2000MA:
217 return 2000000;
218 case CHRG_VBUS_ILIM_2500MA:
219 return 2500000;
220 case CHRG_VBUS_ILIM_3000MA:
221 return 3000000;
222 case CHRG_VBUS_ILIM_3500MA:
223 return 3500000;
224 default:
225 /* All b1xxx values map to 4000 mA */
226 return 4000000;
227 }
228 }
229
axp288_charger_set_vbus_inlmt(struct axp288_chrg_info * info,int inlmt)230 static inline int axp288_charger_set_vbus_inlmt(struct axp288_chrg_info *info,
231 int inlmt)
232 {
233 int ret;
234 u8 reg_val;
235
236 if (inlmt >= 4000000)
237 reg_val = CHRG_VBUS_ILIM_4000MA << CHRG_VBUS_ILIM_BIT_POS;
238 else if (inlmt >= 3500000)
239 reg_val = CHRG_VBUS_ILIM_3500MA << CHRG_VBUS_ILIM_BIT_POS;
240 else if (inlmt >= 3000000)
241 reg_val = CHRG_VBUS_ILIM_3000MA << CHRG_VBUS_ILIM_BIT_POS;
242 else if (inlmt >= 2500000)
243 reg_val = CHRG_VBUS_ILIM_2500MA << CHRG_VBUS_ILIM_BIT_POS;
244 else if (inlmt >= 2000000)
245 reg_val = CHRG_VBUS_ILIM_2000MA << CHRG_VBUS_ILIM_BIT_POS;
246 else if (inlmt >= 1500000)
247 reg_val = CHRG_VBUS_ILIM_1500MA << CHRG_VBUS_ILIM_BIT_POS;
248 else if (inlmt >= 900000)
249 reg_val = CHRG_VBUS_ILIM_900MA << CHRG_VBUS_ILIM_BIT_POS;
250 else if (inlmt >= 500000)
251 reg_val = CHRG_VBUS_ILIM_500MA << CHRG_VBUS_ILIM_BIT_POS;
252 else
253 reg_val = CHRG_VBUS_ILIM_100MA << CHRG_VBUS_ILIM_BIT_POS;
254
255 ret = regmap_update_bits(info->regmap, AXP20X_CHRG_BAK_CTRL,
256 CHRG_VBUS_ILIM_MASK, reg_val);
257 if (ret < 0)
258 dev_err(&info->pdev->dev, "charger BAK control %d\n", ret);
259
260 return ret;
261 }
262
axp288_charger_vbus_path_select(struct axp288_chrg_info * info,bool enable)263 static int axp288_charger_vbus_path_select(struct axp288_chrg_info *info,
264 bool enable)
265 {
266 int ret;
267
268 if (enable)
269 ret = regmap_update_bits(info->regmap, AXP20X_VBUS_IPSOUT_MGMT,
270 VBUS_ISPOUT_VBUS_PATH_DIS, 0);
271 else
272 ret = regmap_update_bits(info->regmap, AXP20X_VBUS_IPSOUT_MGMT,
273 VBUS_ISPOUT_VBUS_PATH_DIS, VBUS_ISPOUT_VBUS_PATH_DIS);
274
275 if (ret < 0)
276 dev_err(&info->pdev->dev, "axp288 vbus path select %d\n", ret);
277
278 return ret;
279 }
280
axp288_charger_enable_charger(struct axp288_chrg_info * info,bool enable)281 static int axp288_charger_enable_charger(struct axp288_chrg_info *info,
282 bool enable)
283 {
284 int ret;
285
286 if (enable)
287 ret = regmap_update_bits(info->regmap, AXP20X_CHRG_CTRL1,
288 CHRG_CCCV_CHG_EN, CHRG_CCCV_CHG_EN);
289 else
290 ret = regmap_update_bits(info->regmap, AXP20X_CHRG_CTRL1,
291 CHRG_CCCV_CHG_EN, 0);
292 if (ret < 0)
293 dev_err(&info->pdev->dev, "axp288 enable charger %d\n", ret);
294
295 return ret;
296 }
297
axp288_charger_is_present(struct axp288_chrg_info * info)298 static int axp288_charger_is_present(struct axp288_chrg_info *info)
299 {
300 int ret, present = 0;
301 unsigned int val;
302
303 ret = regmap_read(info->regmap, AXP20X_PWR_INPUT_STATUS, &val);
304 if (ret < 0)
305 return ret;
306
307 if (val & PS_STAT_VBUS_PRESENT)
308 present = 1;
309 return present;
310 }
311
axp288_charger_is_online(struct axp288_chrg_info * info)312 static int axp288_charger_is_online(struct axp288_chrg_info *info)
313 {
314 int ret, online = 0;
315 unsigned int val;
316
317 ret = regmap_read(info->regmap, AXP20X_PWR_INPUT_STATUS, &val);
318 if (ret < 0)
319 return ret;
320
321 if (val & PS_STAT_VBUS_VALID)
322 online = 1;
323 return online;
324 }
325
axp288_get_charger_health(struct axp288_chrg_info * info)326 static int axp288_get_charger_health(struct axp288_chrg_info *info)
327 {
328 int ret, pwr_stat, chrg_stat;
329 int health = POWER_SUPPLY_HEALTH_UNKNOWN;
330 unsigned int val;
331
332 ret = regmap_read(info->regmap, AXP20X_PWR_INPUT_STATUS, &val);
333 if ((ret < 0) || !(val & PS_STAT_VBUS_PRESENT))
334 goto health_read_fail;
335 else
336 pwr_stat = val;
337
338 ret = regmap_read(info->regmap, AXP20X_PWR_OP_MODE, &val);
339 if (ret < 0)
340 goto health_read_fail;
341 else
342 chrg_stat = val;
343
344 if (!(pwr_stat & PS_STAT_VBUS_VALID))
345 health = POWER_SUPPLY_HEALTH_DEAD;
346 else if (chrg_stat & CHRG_STAT_PMIC_OTP)
347 health = POWER_SUPPLY_HEALTH_OVERHEAT;
348 else if (chrg_stat & CHRG_STAT_BAT_SAFE_MODE)
349 health = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
350 else
351 health = POWER_SUPPLY_HEALTH_GOOD;
352
353 health_read_fail:
354 return health;
355 }
356
axp288_charger_usb_set_property(struct power_supply * psy,enum power_supply_property psp,const union power_supply_propval * val)357 static int axp288_charger_usb_set_property(struct power_supply *psy,
358 enum power_supply_property psp,
359 const union power_supply_propval *val)
360 {
361 struct axp288_chrg_info *info = power_supply_get_drvdata(psy);
362 int ret = 0;
363 int scaled_val;
364
365 switch (psp) {
366 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
367 scaled_val = min(val->intval, info->max_cc);
368 scaled_val = DIV_ROUND_CLOSEST(scaled_val, 1000);
369 ret = axp288_charger_set_cc(info, scaled_val);
370 if (ret < 0)
371 dev_warn(&info->pdev->dev, "set charge current failed\n");
372 break;
373 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
374 scaled_val = min(val->intval, info->max_cv);
375 scaled_val = DIV_ROUND_CLOSEST(scaled_val, 1000);
376 ret = axp288_charger_set_cv(info, scaled_val);
377 if (ret < 0)
378 dev_warn(&info->pdev->dev, "set charge voltage failed\n");
379 break;
380 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
381 ret = axp288_charger_set_vbus_inlmt(info, val->intval);
382 if (ret < 0)
383 dev_warn(&info->pdev->dev, "set input current limit failed\n");
384 break;
385 default:
386 ret = -EINVAL;
387 }
388
389 return ret;
390 }
391
axp288_charger_usb_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)392 static int axp288_charger_usb_get_property(struct power_supply *psy,
393 enum power_supply_property psp,
394 union power_supply_propval *val)
395 {
396 struct axp288_chrg_info *info = power_supply_get_drvdata(psy);
397 int ret;
398
399 switch (psp) {
400 case POWER_SUPPLY_PROP_PRESENT:
401 /* Check for OTG case first */
402 if (info->otg.id_short) {
403 val->intval = 0;
404 break;
405 }
406 ret = axp288_charger_is_present(info);
407 if (ret < 0)
408 return ret;
409 val->intval = ret;
410 break;
411 case POWER_SUPPLY_PROP_ONLINE:
412 /* Check for OTG case first */
413 if (info->otg.id_short) {
414 val->intval = 0;
415 break;
416 }
417 ret = axp288_charger_is_online(info);
418 if (ret < 0)
419 return ret;
420 val->intval = ret;
421 break;
422 case POWER_SUPPLY_PROP_HEALTH:
423 val->intval = axp288_get_charger_health(info);
424 break;
425 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
426 val->intval = info->cc * 1000;
427 break;
428 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
429 val->intval = info->max_cc * 1000;
430 break;
431 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
432 val->intval = info->cv * 1000;
433 break;
434 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
435 val->intval = info->max_cv * 1000;
436 break;
437 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
438 ret = axp288_charger_get_vbus_inlmt(info);
439 if (ret < 0)
440 return ret;
441 val->intval = ret;
442 break;
443 default:
444 return -EINVAL;
445 }
446
447 return 0;
448 }
449
axp288_charger_property_is_writeable(struct power_supply * psy,enum power_supply_property psp)450 static int axp288_charger_property_is_writeable(struct power_supply *psy,
451 enum power_supply_property psp)
452 {
453 int ret;
454
455 switch (psp) {
456 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
457 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
458 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
459 ret = 1;
460 break;
461 default:
462 ret = 0;
463 }
464
465 return ret;
466 }
467
468 static enum power_supply_property axp288_usb_props[] = {
469 POWER_SUPPLY_PROP_PRESENT,
470 POWER_SUPPLY_PROP_ONLINE,
471 POWER_SUPPLY_PROP_TYPE,
472 POWER_SUPPLY_PROP_HEALTH,
473 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
474 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
475 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
476 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
477 POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
478 };
479
480 static const struct power_supply_desc axp288_charger_desc = {
481 .name = "axp288_charger",
482 .type = POWER_SUPPLY_TYPE_USB,
483 .properties = axp288_usb_props,
484 .num_properties = ARRAY_SIZE(axp288_usb_props),
485 .get_property = axp288_charger_usb_get_property,
486 .set_property = axp288_charger_usb_set_property,
487 .property_is_writeable = axp288_charger_property_is_writeable,
488 };
489
axp288_charger_irq_thread_handler(int irq,void * dev)490 static irqreturn_t axp288_charger_irq_thread_handler(int irq, void *dev)
491 {
492 struct axp288_chrg_info *info = dev;
493 int i;
494
495 for (i = 0; i < CHRG_INTR_END; i++) {
496 if (info->irq[i] == irq)
497 break;
498 }
499
500 if (i >= CHRG_INTR_END) {
501 dev_warn(&info->pdev->dev, "spurious interrupt!!\n");
502 return IRQ_NONE;
503 }
504
505 switch (i) {
506 case VBUS_OV_IRQ:
507 dev_dbg(&info->pdev->dev, "VBUS Over Voltage INTR\n");
508 break;
509 case CHARGE_DONE_IRQ:
510 dev_dbg(&info->pdev->dev, "Charging Done INTR\n");
511 break;
512 case CHARGE_CHARGING_IRQ:
513 dev_dbg(&info->pdev->dev, "Start Charging IRQ\n");
514 break;
515 case BAT_SAFE_QUIT_IRQ:
516 dev_dbg(&info->pdev->dev,
517 "Quit Safe Mode(restart timer) Charging IRQ\n");
518 break;
519 case BAT_SAFE_ENTER_IRQ:
520 dev_dbg(&info->pdev->dev,
521 "Enter Safe Mode(timer expire) Charging IRQ\n");
522 break;
523 case QCBTU_IRQ:
524 dev_dbg(&info->pdev->dev,
525 "Quit Battery Under Temperature(CHRG) INTR\n");
526 break;
527 case CBTU_IRQ:
528 dev_dbg(&info->pdev->dev,
529 "Hit Battery Under Temperature(CHRG) INTR\n");
530 break;
531 case QCBTO_IRQ:
532 dev_dbg(&info->pdev->dev,
533 "Quit Battery Over Temperature(CHRG) INTR\n");
534 break;
535 case CBTO_IRQ:
536 dev_dbg(&info->pdev->dev,
537 "Hit Battery Over Temperature(CHRG) INTR\n");
538 break;
539 default:
540 dev_warn(&info->pdev->dev, "Spurious Interrupt!!!\n");
541 goto out;
542 }
543
544 power_supply_changed(info->psy_usb);
545 out:
546 return IRQ_HANDLED;
547 }
548
549 /*
550 * The HP Pavilion x2 10 series comes in a number of variants:
551 * Bay Trail SoC + AXP288 PMIC, DMI_BOARD_NAME: "815D"
552 * Cherry Trail SoC + AXP288 PMIC, DMI_BOARD_NAME: "813E"
553 * Cherry Trail SoC + TI PMIC, DMI_BOARD_NAME: "827C" or "82F4"
554 *
555 * The variants with the AXP288 PMIC are all kinds of special:
556 *
557 * 1. All variants use a Type-C connector which the AXP288 does not support, so
558 * when using a Type-C charger it is not recognized. Unlike most AXP288 devices,
559 * this model actually has mostly working ACPI AC / Battery code, the ACPI code
560 * "solves" this by simply setting the input_current_limit to 3A.
561 * There are still some issues with the ACPI code, so we use this native driver,
562 * and to solve the charging not working (500mA is not enough) issue we hardcode
563 * the 3A input_current_limit like the ACPI code does.
564 *
565 * 2. If no charger is connected the machine boots with the vbus-path disabled.
566 * Normally this is done when a 5V boost converter is active to avoid the PMIC
567 * trying to charge from the 5V boost converter's output. This is done when
568 * an OTG host cable is inserted and the ID pin on the micro-B receptacle is
569 * pulled low and the ID pin has an ACPI event handler associated with it
570 * which re-enables the vbus-path when the ID pin is pulled high when the
571 * OTG host cable is removed. The Type-C connector has no ID pin, there is
572 * no ID pin handler and there appears to be no 5V boost converter, so we
573 * end up not charging because the vbus-path is disabled, until we unplug
574 * the charger which automatically clears the vbus-path disable bit and then
575 * on the second plug-in of the adapter we start charging. To solve the not
576 * charging on first charger plugin we unconditionally enable the vbus-path at
577 * probe on this model, which is safe since there is no 5V boost converter.
578 */
579 static const struct dmi_system_id axp288_hp_x2_dmi_ids[] = {
580 {
581 /*
582 * Bay Trail model has "Hewlett-Packard" as sys_vendor, Cherry
583 * Trail model has "HP", so we only match on product_name.
584 */
585 .matches = {
586 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion x2 Detachable"),
587 },
588 },
589 {} /* Terminating entry */
590 };
591
axp288_charger_extcon_evt_worker(struct work_struct * work)592 static void axp288_charger_extcon_evt_worker(struct work_struct *work)
593 {
594 struct axp288_chrg_info *info =
595 container_of(work, struct axp288_chrg_info, cable.work);
596 int ret, current_limit;
597 struct extcon_dev *edev = info->cable.edev;
598 unsigned int val;
599
600 ret = regmap_read(info->regmap, AXP20X_PWR_INPUT_STATUS, &val);
601 if (ret < 0) {
602 dev_err(&info->pdev->dev, "Error reading status (%d)\n", ret);
603 return;
604 }
605
606 /* Offline? Disable charging and bail */
607 if (!(val & PS_STAT_VBUS_VALID)) {
608 dev_dbg(&info->pdev->dev, "USB charger disconnected\n");
609 axp288_charger_enable_charger(info, false);
610 power_supply_changed(info->psy_usb);
611 return;
612 }
613
614 /* Determine cable/charger type */
615 if (dmi_check_system(axp288_hp_x2_dmi_ids)) {
616 /* See comment above axp288_hp_x2_dmi_ids declaration */
617 dev_dbg(&info->pdev->dev, "HP X2 with Type-C, setting inlmt to 3A\n");
618 current_limit = 3000000;
619 } else if (extcon_get_state(edev, EXTCON_CHG_USB_SDP) > 0) {
620 dev_dbg(&info->pdev->dev, "USB SDP charger is connected\n");
621 current_limit = 500000;
622 } else if (extcon_get_state(edev, EXTCON_CHG_USB_CDP) > 0) {
623 dev_dbg(&info->pdev->dev, "USB CDP charger is connected\n");
624 current_limit = 1500000;
625 } else if (extcon_get_state(edev, EXTCON_CHG_USB_DCP) > 0) {
626 dev_dbg(&info->pdev->dev, "USB DCP charger is connected\n");
627 current_limit = 2000000;
628 } else {
629 /* Charger type detection still in progress, bail. */
630 return;
631 }
632
633 /* Set vbus current limit first, then enable charger */
634 ret = axp288_charger_set_vbus_inlmt(info, current_limit);
635 if (ret == 0)
636 axp288_charger_enable_charger(info, true);
637 else
638 dev_err(&info->pdev->dev,
639 "error setting current limit (%d)\n", ret);
640
641 power_supply_changed(info->psy_usb);
642 }
643
axp288_charger_handle_cable_evt(struct notifier_block * nb,unsigned long event,void * param)644 static int axp288_charger_handle_cable_evt(struct notifier_block *nb,
645 unsigned long event, void *param)
646 {
647 struct axp288_chrg_info *info =
648 container_of(nb, struct axp288_chrg_info, cable.nb);
649 schedule_work(&info->cable.work);
650 return NOTIFY_OK;
651 }
652
axp288_charger_otg_evt_worker(struct work_struct * work)653 static void axp288_charger_otg_evt_worker(struct work_struct *work)
654 {
655 struct axp288_chrg_info *info =
656 container_of(work, struct axp288_chrg_info, otg.work);
657 struct extcon_dev *edev = info->otg.cable;
658 int ret, usb_host = extcon_get_state(edev, EXTCON_USB_HOST);
659
660 dev_dbg(&info->pdev->dev, "external connector USB-Host is %s\n",
661 usb_host ? "attached" : "detached");
662
663 /*
664 * Set usb_id_short flag to avoid running charger detection logic
665 * in case usb host.
666 */
667 info->otg.id_short = usb_host;
668
669 /* Disable VBUS path before enabling the 5V boost */
670 ret = axp288_charger_vbus_path_select(info, !info->otg.id_short);
671 if (ret < 0)
672 dev_warn(&info->pdev->dev, "vbus path disable failed\n");
673 }
674
axp288_charger_handle_otg_evt(struct notifier_block * nb,unsigned long event,void * param)675 static int axp288_charger_handle_otg_evt(struct notifier_block *nb,
676 unsigned long event, void *param)
677 {
678 struct axp288_chrg_info *info =
679 container_of(nb, struct axp288_chrg_info, otg.id_nb);
680
681 schedule_work(&info->otg.work);
682
683 return NOTIFY_OK;
684 }
685
charger_init_hw_regs(struct axp288_chrg_info * info)686 static int charger_init_hw_regs(struct axp288_chrg_info *info)
687 {
688 int ret, cc, cv;
689 unsigned int val;
690
691 /* Program temperature thresholds */
692 ret = regmap_write(info->regmap, AXP20X_V_LTF_CHRG, CHRG_VLTFC_0C);
693 if (ret < 0) {
694 dev_err(&info->pdev->dev, "register(%x) write error(%d)\n",
695 AXP20X_V_LTF_CHRG, ret);
696 return ret;
697 }
698
699 ret = regmap_write(info->regmap, AXP20X_V_HTF_CHRG, CHRG_VHTFC_45C);
700 if (ret < 0) {
701 dev_err(&info->pdev->dev, "register(%x) write error(%d)\n",
702 AXP20X_V_HTF_CHRG, ret);
703 return ret;
704 }
705
706 /* Do not turn-off charger o/p after charge cycle ends */
707 ret = regmap_update_bits(info->regmap,
708 AXP20X_CHRG_CTRL2,
709 CNTL2_CHG_OUT_TURNON, CNTL2_CHG_OUT_TURNON);
710 if (ret < 0) {
711 dev_err(&info->pdev->dev, "register(%x) write error(%d)\n",
712 AXP20X_CHRG_CTRL2, ret);
713 return ret;
714 }
715
716 /* Setup ending condition for charging to be 10% of I(chrg) */
717 ret = regmap_update_bits(info->regmap,
718 AXP20X_CHRG_CTRL1,
719 CHRG_CCCV_ITERM_20P, 0);
720 if (ret < 0) {
721 dev_err(&info->pdev->dev, "register(%x) write error(%d)\n",
722 AXP20X_CHRG_CTRL1, ret);
723 return ret;
724 }
725
726 /* Disable OCV-SOC curve calibration */
727 ret = regmap_update_bits(info->regmap,
728 AXP20X_CC_CTRL,
729 FG_CNTL_OCV_ADJ_EN, 0);
730 if (ret < 0) {
731 dev_err(&info->pdev->dev, "register(%x) write error(%d)\n",
732 AXP20X_CC_CTRL, ret);
733 return ret;
734 }
735
736 if (dmi_check_system(axp288_hp_x2_dmi_ids)) {
737 /* See comment above axp288_hp_x2_dmi_ids declaration */
738 ret = axp288_charger_vbus_path_select(info, true);
739 if (ret < 0)
740 return ret;
741 }
742
743 /* Read current charge voltage and current limit */
744 ret = regmap_read(info->regmap, AXP20X_CHRG_CTRL1, &val);
745 if (ret < 0) {
746 dev_err(&info->pdev->dev, "register(%x) read error(%d)\n",
747 AXP20X_CHRG_CTRL1, ret);
748 return ret;
749 }
750
751 /* Determine charge voltage */
752 cv = (val & CHRG_CCCV_CV_MASK) >> CHRG_CCCV_CV_BIT_POS;
753 switch (cv) {
754 case CHRG_CCCV_CV_4100MV:
755 info->cv = CV_4100MV;
756 break;
757 case CHRG_CCCV_CV_4150MV:
758 info->cv = CV_4150MV;
759 break;
760 case CHRG_CCCV_CV_4200MV:
761 info->cv = CV_4200MV;
762 break;
763 case CHRG_CCCV_CV_4350MV:
764 info->cv = CV_4350MV;
765 break;
766 }
767
768 /* Determine charge current limit */
769 cc = (val & CHRG_CCCV_CC_MASK) >> CHRG_CCCV_CC_BIT_POS;
770 cc = (cc * CHRG_CCCV_CC_LSB_RES) + CHRG_CCCV_CC_OFFSET;
771 info->cc = cc;
772
773 /*
774 * Do not allow the user to configure higher settings then those
775 * set by the firmware
776 */
777 info->max_cv = info->cv;
778 info->max_cc = info->cc;
779
780 return 0;
781 }
782
axp288_charger_cancel_work(void * data)783 static void axp288_charger_cancel_work(void *data)
784 {
785 struct axp288_chrg_info *info = data;
786
787 cancel_work_sync(&info->otg.work);
788 cancel_work_sync(&info->cable.work);
789 }
790
axp288_charger_probe(struct platform_device * pdev)791 static int axp288_charger_probe(struct platform_device *pdev)
792 {
793 int ret, i, pirq;
794 struct axp288_chrg_info *info;
795 struct device *dev = &pdev->dev;
796 struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
797 struct power_supply_config charger_cfg = {};
798 unsigned int val;
799
800 /*
801 * On some devices the fuelgauge and charger parts of the axp288 are
802 * not used, check that the fuelgauge is enabled (CC_CTRL != 0).
803 */
804 ret = regmap_read(axp20x->regmap, AXP20X_CC_CTRL, &val);
805 if (ret < 0)
806 return ret;
807 if (val == 0)
808 return -ENODEV;
809
810 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
811 if (!info)
812 return -ENOMEM;
813
814 info->pdev = pdev;
815 info->regmap = axp20x->regmap;
816 info->regmap_irqc = axp20x->regmap_irqc;
817
818 info->cable.edev = extcon_get_extcon_dev(AXP288_EXTCON_DEV_NAME);
819 if (info->cable.edev == NULL) {
820 dev_dbg(&pdev->dev, "%s is not ready, probe deferred\n",
821 AXP288_EXTCON_DEV_NAME);
822 return -EPROBE_DEFER;
823 }
824
825 if (acpi_dev_present(USB_HOST_EXTCON_HID, NULL, -1)) {
826 info->otg.cable = extcon_get_extcon_dev(USB_HOST_EXTCON_NAME);
827 if (info->otg.cable == NULL) {
828 dev_dbg(dev, "EXTCON_USB_HOST is not ready, probe deferred\n");
829 return -EPROBE_DEFER;
830 }
831 dev_info(&pdev->dev,
832 "Using " USB_HOST_EXTCON_HID " extcon for usb-id\n");
833 }
834
835 platform_set_drvdata(pdev, info);
836
837 ret = charger_init_hw_regs(info);
838 if (ret)
839 return ret;
840
841 /* Register with power supply class */
842 charger_cfg.drv_data = info;
843 info->psy_usb = devm_power_supply_register(dev, &axp288_charger_desc,
844 &charger_cfg);
845 if (IS_ERR(info->psy_usb)) {
846 ret = PTR_ERR(info->psy_usb);
847 dev_err(dev, "failed to register power supply: %d\n", ret);
848 return ret;
849 }
850
851 /* Cancel our work on cleanup, register this before the notifiers */
852 ret = devm_add_action(dev, axp288_charger_cancel_work, info);
853 if (ret)
854 return ret;
855
856 /* Register for extcon notification */
857 INIT_WORK(&info->cable.work, axp288_charger_extcon_evt_worker);
858 info->cable.nb.notifier_call = axp288_charger_handle_cable_evt;
859 ret = devm_extcon_register_notifier_all(dev, info->cable.edev,
860 &info->cable.nb);
861 if (ret) {
862 dev_err(dev, "failed to register cable extcon notifier\n");
863 return ret;
864 }
865 schedule_work(&info->cable.work);
866
867 /* Register for OTG notification */
868 INIT_WORK(&info->otg.work, axp288_charger_otg_evt_worker);
869 info->otg.id_nb.notifier_call = axp288_charger_handle_otg_evt;
870 if (info->otg.cable) {
871 ret = devm_extcon_register_notifier(&pdev->dev, info->otg.cable,
872 EXTCON_USB_HOST, &info->otg.id_nb);
873 if (ret) {
874 dev_err(dev, "failed to register EXTCON_USB_HOST notifier\n");
875 return ret;
876 }
877 schedule_work(&info->otg.work);
878 }
879
880 /* Register charger interrupts */
881 for (i = 0; i < CHRG_INTR_END; i++) {
882 pirq = platform_get_irq(info->pdev, i);
883 if (pirq < 0)
884 return pirq;
885
886 info->irq[i] = regmap_irq_get_virq(info->regmap_irqc, pirq);
887 if (info->irq[i] < 0) {
888 dev_warn(&info->pdev->dev,
889 "failed to get virtual interrupt=%d\n", pirq);
890 return info->irq[i];
891 }
892 ret = devm_request_threaded_irq(&info->pdev->dev, info->irq[i],
893 NULL, axp288_charger_irq_thread_handler,
894 IRQF_ONESHOT, info->pdev->name, info);
895 if (ret) {
896 dev_err(&pdev->dev, "failed to request interrupt=%d\n",
897 info->irq[i]);
898 return ret;
899 }
900 }
901
902 return 0;
903 }
904
905 static const struct platform_device_id axp288_charger_id_table[] = {
906 { .name = "axp288_charger" },
907 {},
908 };
909 MODULE_DEVICE_TABLE(platform, axp288_charger_id_table);
910
911 static struct platform_driver axp288_charger_driver = {
912 .probe = axp288_charger_probe,
913 .id_table = axp288_charger_id_table,
914 .driver = {
915 .name = "axp288_charger",
916 },
917 };
918
919 module_platform_driver(axp288_charger_driver);
920
921 MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@intel.com>");
922 MODULE_DESCRIPTION("X-power AXP288 Charger Driver");
923 MODULE_LICENSE("GPL v2");
924