1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * TI LP8788 MFD - battery charger driver |
4 | * |
5 | * Copyright 2012 Texas Instruments |
6 | * |
7 | * Author: Milo(Woogyom) Kim <milo.kim@ti.com> |
8 | */ |
9 | |
10 | #include <linux/err.h> |
11 | #include <linux/iio/consumer.h> |
12 | #include <linux/interrupt.h> |
13 | #include <linux/irqdomain.h> |
14 | #include <linux/mfd/lp8788.h> |
15 | #include <linux/module.h> |
16 | #include <linux/platform_device.h> |
17 | #include <linux/power_supply.h> |
18 | #include <linux/slab.h> |
19 | #include <linux/workqueue.h> |
20 | |
21 | /* register address */ |
22 | #define LP8788_CHG_STATUS 0x07 |
23 | #define LP8788_CHG_IDCIN 0x13 |
24 | #define LP8788_CHG_IBATT 0x14 |
25 | #define LP8788_CHG_VTERM 0x15 |
26 | #define LP8788_CHG_EOC 0x16 |
27 | |
28 | /* mask/shift bits */ |
29 | #define LP8788_CHG_INPUT_STATE_M 0x03 /* Addr 07h */ |
30 | #define LP8788_CHG_STATE_M 0x3C |
31 | #define LP8788_CHG_STATE_S 2 |
32 | #define LP8788_NO_BATT_M BIT(6) |
33 | #define LP8788_BAD_BATT_M BIT(7) |
34 | #define LP8788_CHG_IBATT_M 0x1F /* Addr 14h */ |
35 | #define LP8788_CHG_VTERM_M 0x0F /* Addr 15h */ |
36 | #define LP8788_CHG_EOC_LEVEL_M 0x30 /* Addr 16h */ |
37 | #define LP8788_CHG_EOC_LEVEL_S 4 |
38 | #define LP8788_CHG_EOC_TIME_M 0x0E |
39 | #define LP8788_CHG_EOC_TIME_S 1 |
40 | #define LP8788_CHG_EOC_MODE_M BIT(0) |
41 | |
42 | #define LP8788_CHARGER_NAME "charger" |
43 | #define LP8788_BATTERY_NAME "main_batt" |
44 | |
45 | #define LP8788_CHG_START 0x11 |
46 | #define LP8788_CHG_END 0x1C |
47 | |
48 | #define LP8788_ISEL_MAX 23 |
49 | #define LP8788_ISEL_STEP 50 |
50 | #define LP8788_VTERM_MIN 4100 |
51 | #define LP8788_VTERM_STEP 25 |
52 | #define LP8788_MAX_BATT_CAPACITY 100 |
53 | #define LP8788_MAX_CHG_IRQS 11 |
54 | |
55 | enum lp8788_charging_state { |
56 | LP8788_OFF, |
57 | LP8788_WARM_UP, |
58 | LP8788_LOW_INPUT = 0x3, |
59 | LP8788_PRECHARGE, |
60 | LP8788_CC, |
61 | LP8788_CV, |
62 | LP8788_MAINTENANCE, |
63 | LP8788_BATTERY_FAULT, |
64 | LP8788_SYSTEM_SUPPORT = 0xC, |
65 | LP8788_HIGH_CURRENT = 0xF, |
66 | LP8788_MAX_CHG_STATE, |
67 | }; |
68 | |
69 | enum lp8788_charger_adc_sel { |
70 | LP8788_VBATT, |
71 | LP8788_BATT_TEMP, |
72 | LP8788_NUM_CHG_ADC, |
73 | }; |
74 | |
75 | enum lp8788_charger_input_state { |
76 | LP8788_SYSTEM_SUPPLY = 1, |
77 | LP8788_FULL_FUNCTION, |
78 | }; |
79 | |
80 | /* |
81 | * struct lp8788_chg_irq |
82 | * @which : lp8788 interrupt id |
83 | * @virq : Linux IRQ number from irq_domain |
84 | */ |
85 | struct lp8788_chg_irq { |
86 | enum lp8788_int_id which; |
87 | int virq; |
88 | }; |
89 | |
90 | /* |
91 | * struct lp8788_charger |
92 | * @lp : used for accessing the registers of mfd lp8788 device |
93 | * @charger : power supply driver for the battery charger |
94 | * @battery : power supply driver for the battery |
95 | * @charger_work : work queue for charger input interrupts |
96 | * @chan : iio channels for getting adc values |
97 | * eg) battery voltage, capacity and temperature |
98 | * @irqs : charger dedicated interrupts |
99 | * @num_irqs : total numbers of charger interrupts |
100 | * @pdata : charger platform specific data |
101 | */ |
102 | struct lp8788_charger { |
103 | struct lp8788 *lp; |
104 | struct power_supply *charger; |
105 | struct power_supply *battery; |
106 | struct work_struct charger_work; |
107 | struct iio_channel *chan[LP8788_NUM_CHG_ADC]; |
108 | struct lp8788_chg_irq irqs[LP8788_MAX_CHG_IRQS]; |
109 | int num_irqs; |
110 | struct lp8788_charger_platform_data *pdata; |
111 | }; |
112 | |
113 | static char *battery_supplied_to[] = { |
114 | LP8788_BATTERY_NAME, |
115 | }; |
116 | |
117 | static enum power_supply_property lp8788_charger_prop[] = { |
118 | POWER_SUPPLY_PROP_ONLINE, |
119 | POWER_SUPPLY_PROP_CURRENT_MAX, |
120 | }; |
121 | |
122 | static enum power_supply_property lp8788_battery_prop[] = { |
123 | POWER_SUPPLY_PROP_STATUS, |
124 | POWER_SUPPLY_PROP_HEALTH, |
125 | POWER_SUPPLY_PROP_PRESENT, |
126 | POWER_SUPPLY_PROP_VOLTAGE_NOW, |
127 | POWER_SUPPLY_PROP_CAPACITY, |
128 | POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT, |
129 | POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX, |
130 | POWER_SUPPLY_PROP_TEMP, |
131 | }; |
132 | |
133 | static bool lp8788_is_charger_detected(struct lp8788_charger *pchg) |
134 | { |
135 | u8 data; |
136 | |
137 | lp8788_read_byte(lp: pchg->lp, LP8788_CHG_STATUS, data: &data); |
138 | data &= LP8788_CHG_INPUT_STATE_M; |
139 | |
140 | return data == LP8788_SYSTEM_SUPPLY || data == LP8788_FULL_FUNCTION; |
141 | } |
142 | |
143 | static int lp8788_charger_get_property(struct power_supply *psy, |
144 | enum power_supply_property psp, |
145 | union power_supply_propval *val) |
146 | { |
147 | struct lp8788_charger *pchg = dev_get_drvdata(dev: psy->dev.parent); |
148 | u8 read; |
149 | |
150 | switch (psp) { |
151 | case POWER_SUPPLY_PROP_ONLINE: |
152 | val->intval = lp8788_is_charger_detected(pchg); |
153 | break; |
154 | case POWER_SUPPLY_PROP_CURRENT_MAX: |
155 | lp8788_read_byte(lp: pchg->lp, LP8788_CHG_IDCIN, data: &read); |
156 | val->intval = LP8788_ISEL_STEP * |
157 | (min_t(int, read, LP8788_ISEL_MAX) + 1); |
158 | break; |
159 | default: |
160 | return -EINVAL; |
161 | } |
162 | |
163 | return 0; |
164 | } |
165 | |
166 | static int lp8788_get_battery_status(struct lp8788_charger *pchg, |
167 | union power_supply_propval *val) |
168 | { |
169 | enum lp8788_charging_state state; |
170 | u8 data; |
171 | int ret; |
172 | |
173 | ret = lp8788_read_byte(lp: pchg->lp, LP8788_CHG_STATUS, data: &data); |
174 | if (ret) |
175 | return ret; |
176 | |
177 | state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S; |
178 | switch (state) { |
179 | case LP8788_OFF: |
180 | val->intval = POWER_SUPPLY_STATUS_DISCHARGING; |
181 | break; |
182 | case LP8788_PRECHARGE: |
183 | case LP8788_CC: |
184 | case LP8788_CV: |
185 | case LP8788_HIGH_CURRENT: |
186 | val->intval = POWER_SUPPLY_STATUS_CHARGING; |
187 | break; |
188 | case LP8788_MAINTENANCE: |
189 | val->intval = POWER_SUPPLY_STATUS_FULL; |
190 | break; |
191 | default: |
192 | val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; |
193 | break; |
194 | } |
195 | |
196 | return 0; |
197 | } |
198 | |
199 | static int lp8788_get_battery_health(struct lp8788_charger *pchg, |
200 | union power_supply_propval *val) |
201 | { |
202 | u8 data; |
203 | int ret; |
204 | |
205 | ret = lp8788_read_byte(lp: pchg->lp, LP8788_CHG_STATUS, data: &data); |
206 | if (ret) |
207 | return ret; |
208 | |
209 | if (data & LP8788_NO_BATT_M) |
210 | val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; |
211 | else if (data & LP8788_BAD_BATT_M) |
212 | val->intval = POWER_SUPPLY_HEALTH_DEAD; |
213 | else |
214 | val->intval = POWER_SUPPLY_HEALTH_GOOD; |
215 | |
216 | return 0; |
217 | } |
218 | |
219 | static int lp8788_get_battery_present(struct lp8788_charger *pchg, |
220 | union power_supply_propval *val) |
221 | { |
222 | u8 data; |
223 | int ret; |
224 | |
225 | ret = lp8788_read_byte(lp: pchg->lp, LP8788_CHG_STATUS, data: &data); |
226 | if (ret) |
227 | return ret; |
228 | |
229 | val->intval = !(data & LP8788_NO_BATT_M); |
230 | return 0; |
231 | } |
232 | |
233 | static int lp8788_get_vbatt_adc(struct lp8788_charger *pchg, int *result) |
234 | { |
235 | struct iio_channel *channel = pchg->chan[LP8788_VBATT]; |
236 | |
237 | if (!channel) |
238 | return -EINVAL; |
239 | |
240 | return iio_read_channel_processed(chan: channel, val: result); |
241 | } |
242 | |
243 | static int lp8788_get_battery_voltage(struct lp8788_charger *pchg, |
244 | union power_supply_propval *val) |
245 | { |
246 | return lp8788_get_vbatt_adc(pchg, result: &val->intval); |
247 | } |
248 | |
249 | static int lp8788_get_battery_capacity(struct lp8788_charger *pchg, |
250 | union power_supply_propval *val) |
251 | { |
252 | struct lp8788 *lp = pchg->lp; |
253 | struct lp8788_charger_platform_data *pdata = pchg->pdata; |
254 | unsigned int max_vbatt; |
255 | int vbatt; |
256 | enum lp8788_charging_state state; |
257 | u8 data; |
258 | int ret; |
259 | |
260 | if (!pdata) |
261 | return -EINVAL; |
262 | |
263 | max_vbatt = pdata->max_vbatt_mv; |
264 | if (max_vbatt == 0) |
265 | return -EINVAL; |
266 | |
267 | ret = lp8788_read_byte(lp, LP8788_CHG_STATUS, data: &data); |
268 | if (ret) |
269 | return ret; |
270 | |
271 | state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S; |
272 | |
273 | if (state == LP8788_MAINTENANCE) { |
274 | val->intval = LP8788_MAX_BATT_CAPACITY; |
275 | } else { |
276 | ret = lp8788_get_vbatt_adc(pchg, result: &vbatt); |
277 | if (ret) |
278 | return ret; |
279 | |
280 | val->intval = (vbatt * LP8788_MAX_BATT_CAPACITY) / max_vbatt; |
281 | val->intval = min(val->intval, LP8788_MAX_BATT_CAPACITY); |
282 | } |
283 | |
284 | return 0; |
285 | } |
286 | |
287 | static int lp8788_get_battery_temperature(struct lp8788_charger *pchg, |
288 | union power_supply_propval *val) |
289 | { |
290 | struct iio_channel *channel = pchg->chan[LP8788_BATT_TEMP]; |
291 | int result; |
292 | int ret; |
293 | |
294 | if (!channel) |
295 | return -EINVAL; |
296 | |
297 | ret = iio_read_channel_processed(chan: channel, val: &result); |
298 | if (ret < 0) |
299 | return -EINVAL; |
300 | |
301 | /* unit: 0.1 'C */ |
302 | val->intval = result * 10; |
303 | |
304 | return 0; |
305 | } |
306 | |
307 | static int lp8788_get_battery_charging_current(struct lp8788_charger *pchg, |
308 | union power_supply_propval *val) |
309 | { |
310 | u8 read; |
311 | |
312 | lp8788_read_byte(lp: pchg->lp, LP8788_CHG_IBATT, data: &read); |
313 | read &= LP8788_CHG_IBATT_M; |
314 | val->intval = LP8788_ISEL_STEP * |
315 | (min_t(int, read, LP8788_ISEL_MAX) + 1); |
316 | |
317 | return 0; |
318 | } |
319 | |
320 | static int lp8788_get_charging_termination_voltage(struct lp8788_charger *pchg, |
321 | union power_supply_propval *val) |
322 | { |
323 | u8 read; |
324 | |
325 | lp8788_read_byte(lp: pchg->lp, LP8788_CHG_VTERM, data: &read); |
326 | read &= LP8788_CHG_VTERM_M; |
327 | val->intval = LP8788_VTERM_MIN + LP8788_VTERM_STEP * read; |
328 | |
329 | return 0; |
330 | } |
331 | |
332 | static int lp8788_battery_get_property(struct power_supply *psy, |
333 | enum power_supply_property psp, |
334 | union power_supply_propval *val) |
335 | { |
336 | struct lp8788_charger *pchg = dev_get_drvdata(dev: psy->dev.parent); |
337 | |
338 | switch (psp) { |
339 | case POWER_SUPPLY_PROP_STATUS: |
340 | return lp8788_get_battery_status(pchg, val); |
341 | case POWER_SUPPLY_PROP_HEALTH: |
342 | return lp8788_get_battery_health(pchg, val); |
343 | case POWER_SUPPLY_PROP_PRESENT: |
344 | return lp8788_get_battery_present(pchg, val); |
345 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: |
346 | return lp8788_get_battery_voltage(pchg, val); |
347 | case POWER_SUPPLY_PROP_CAPACITY: |
348 | return lp8788_get_battery_capacity(pchg, val); |
349 | case POWER_SUPPLY_PROP_TEMP: |
350 | return lp8788_get_battery_temperature(pchg, val); |
351 | case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: |
352 | return lp8788_get_battery_charging_current(pchg, val); |
353 | case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX: |
354 | return lp8788_get_charging_termination_voltage(pchg, val); |
355 | default: |
356 | return -EINVAL; |
357 | } |
358 | } |
359 | |
360 | static inline bool lp8788_is_valid_charger_register(u8 addr) |
361 | { |
362 | return addr >= LP8788_CHG_START && addr <= LP8788_CHG_END; |
363 | } |
364 | |
365 | static int lp8788_update_charger_params(struct platform_device *pdev, |
366 | struct lp8788_charger *pchg) |
367 | { |
368 | struct lp8788 *lp = pchg->lp; |
369 | struct lp8788_charger_platform_data *pdata = pchg->pdata; |
370 | struct lp8788_chg_param *param; |
371 | int i; |
372 | int ret; |
373 | |
374 | if (!pdata || !pdata->chg_params) { |
375 | dev_info(&pdev->dev, "skip updating charger parameters\n" ); |
376 | return 0; |
377 | } |
378 | |
379 | /* setting charging parameters */ |
380 | for (i = 0; i < pdata->num_chg_params; i++) { |
381 | param = pdata->chg_params + i; |
382 | |
383 | if (lp8788_is_valid_charger_register(addr: param->addr)) { |
384 | ret = lp8788_write_byte(lp, reg: param->addr, data: param->val); |
385 | if (ret) |
386 | return ret; |
387 | } |
388 | } |
389 | |
390 | return 0; |
391 | } |
392 | |
393 | static const struct power_supply_desc lp8788_psy_charger_desc = { |
394 | .name = LP8788_CHARGER_NAME, |
395 | .type = POWER_SUPPLY_TYPE_MAINS, |
396 | .properties = lp8788_charger_prop, |
397 | .num_properties = ARRAY_SIZE(lp8788_charger_prop), |
398 | .get_property = lp8788_charger_get_property, |
399 | }; |
400 | |
401 | static const struct power_supply_desc lp8788_psy_battery_desc = { |
402 | .name = LP8788_BATTERY_NAME, |
403 | .type = POWER_SUPPLY_TYPE_BATTERY, |
404 | .properties = lp8788_battery_prop, |
405 | .num_properties = ARRAY_SIZE(lp8788_battery_prop), |
406 | .get_property = lp8788_battery_get_property, |
407 | }; |
408 | |
409 | static void lp8788_psy_unregister(struct lp8788_charger *pchg) |
410 | { |
411 | power_supply_unregister(psy: pchg->battery); |
412 | power_supply_unregister(psy: pchg->charger); |
413 | } |
414 | |
415 | static void lp8788_charger_event(struct work_struct *work) |
416 | { |
417 | struct lp8788_charger *pchg = |
418 | container_of(work, struct lp8788_charger, charger_work); |
419 | struct lp8788_charger_platform_data *pdata = pchg->pdata; |
420 | enum lp8788_charger_event event = lp8788_is_charger_detected(pchg); |
421 | |
422 | pdata->charger_event(pchg->lp, event); |
423 | } |
424 | |
425 | static bool lp8788_find_irq_id(struct lp8788_charger *pchg, int virq, int *id) |
426 | { |
427 | bool found = false; |
428 | int i; |
429 | |
430 | for (i = 0; i < pchg->num_irqs; i++) { |
431 | if (pchg->irqs[i].virq == virq) { |
432 | *id = pchg->irqs[i].which; |
433 | found = true; |
434 | break; |
435 | } |
436 | } |
437 | |
438 | return found; |
439 | } |
440 | |
441 | static irqreturn_t lp8788_charger_irq_thread(int virq, void *ptr) |
442 | { |
443 | struct lp8788_charger *pchg = ptr; |
444 | struct lp8788_charger_platform_data *pdata = pchg->pdata; |
445 | int id = -1; |
446 | |
447 | if (!lp8788_find_irq_id(pchg, virq, id: &id)) |
448 | return IRQ_NONE; |
449 | |
450 | switch (id) { |
451 | case LP8788_INT_CHG_INPUT_STATE: |
452 | case LP8788_INT_CHG_STATE: |
453 | case LP8788_INT_EOC: |
454 | case LP8788_INT_BATT_LOW: |
455 | case LP8788_INT_NO_BATT: |
456 | power_supply_changed(psy: pchg->charger); |
457 | power_supply_changed(psy: pchg->battery); |
458 | break; |
459 | default: |
460 | break; |
461 | } |
462 | |
463 | /* report charger dectection event if used */ |
464 | if (!pdata) |
465 | goto irq_handled; |
466 | |
467 | if (pdata->charger_event && id == LP8788_INT_CHG_INPUT_STATE) |
468 | schedule_work(work: &pchg->charger_work); |
469 | |
470 | irq_handled: |
471 | return IRQ_HANDLED; |
472 | } |
473 | |
474 | static int lp8788_set_irqs(struct platform_device *pdev, |
475 | struct lp8788_charger *pchg, const char *name) |
476 | { |
477 | struct resource *r; |
478 | struct irq_domain *irqdm = pchg->lp->irqdm; |
479 | int irq_start; |
480 | int irq_end; |
481 | int virq; |
482 | int nr_irq; |
483 | int i; |
484 | int ret; |
485 | |
486 | /* no error even if no irq resource */ |
487 | r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, name); |
488 | if (!r) |
489 | return 0; |
490 | |
491 | irq_start = r->start; |
492 | irq_end = r->end; |
493 | |
494 | for (i = irq_start; i <= irq_end; i++) { |
495 | nr_irq = pchg->num_irqs; |
496 | |
497 | virq = irq_create_mapping(host: irqdm, hwirq: i); |
498 | pchg->irqs[nr_irq].virq = virq; |
499 | pchg->irqs[nr_irq].which = i; |
500 | pchg->num_irqs++; |
501 | |
502 | ret = request_threaded_irq(irq: virq, NULL, |
503 | thread_fn: lp8788_charger_irq_thread, |
504 | IRQF_ONESHOT, name, dev: pchg); |
505 | if (ret) |
506 | break; |
507 | } |
508 | |
509 | if (i <= irq_end) |
510 | goto err_free_irq; |
511 | |
512 | return 0; |
513 | |
514 | err_free_irq: |
515 | for (i = 0; i < pchg->num_irqs; i++) |
516 | free_irq(pchg->irqs[i].virq, pchg); |
517 | return ret; |
518 | } |
519 | |
520 | static int lp8788_irq_register(struct platform_device *pdev, |
521 | struct lp8788_charger *pchg) |
522 | { |
523 | static const char * const name[] = { |
524 | LP8788_CHG_IRQ, LP8788_PRSW_IRQ, LP8788_BATT_IRQ |
525 | }; |
526 | int i; |
527 | int ret; |
528 | |
529 | INIT_WORK(&pchg->charger_work, lp8788_charger_event); |
530 | pchg->num_irqs = 0; |
531 | |
532 | for (i = 0; i < ARRAY_SIZE(name); i++) { |
533 | ret = lp8788_set_irqs(pdev, pchg, name: name[i]); |
534 | if (ret) { |
535 | dev_warn(&pdev->dev, "irq setup failed: %s\n" , name[i]); |
536 | return ret; |
537 | } |
538 | } |
539 | |
540 | if (pchg->num_irqs > LP8788_MAX_CHG_IRQS) { |
541 | dev_err(&pdev->dev, "invalid total number of irqs: %d\n" , |
542 | pchg->num_irqs); |
543 | return -EINVAL; |
544 | } |
545 | |
546 | |
547 | return 0; |
548 | } |
549 | |
550 | static void lp8788_irq_unregister(struct platform_device *pdev, |
551 | struct lp8788_charger *pchg) |
552 | { |
553 | int i; |
554 | int irq; |
555 | |
556 | for (i = 0; i < pchg->num_irqs; i++) { |
557 | irq = pchg->irqs[i].virq; |
558 | if (!irq) |
559 | continue; |
560 | |
561 | free_irq(irq, pchg); |
562 | } |
563 | } |
564 | |
565 | static void lp8788_setup_adc_channel(struct device *dev, |
566 | struct lp8788_charger *pchg) |
567 | { |
568 | struct lp8788_charger_platform_data *pdata = pchg->pdata; |
569 | struct iio_channel *chan; |
570 | |
571 | if (!pdata) |
572 | return; |
573 | |
574 | /* ADC channel for battery voltage */ |
575 | chan = devm_iio_channel_get(dev, consumer_channel: pdata->adc_vbatt); |
576 | pchg->chan[LP8788_VBATT] = IS_ERR(ptr: chan) ? NULL : chan; |
577 | |
578 | /* ADC channel for battery temperature */ |
579 | chan = devm_iio_channel_get(dev, consumer_channel: pdata->adc_batt_temp); |
580 | pchg->chan[LP8788_BATT_TEMP] = IS_ERR(ptr: chan) ? NULL : chan; |
581 | } |
582 | |
583 | static ssize_t lp8788_show_charger_status(struct device *dev, |
584 | struct device_attribute *attr, char *buf) |
585 | { |
586 | struct lp8788_charger *pchg = dev_get_drvdata(dev); |
587 | enum lp8788_charging_state state; |
588 | static const char * const desc[LP8788_MAX_CHG_STATE] = { |
589 | [LP8788_OFF] = "CHARGER OFF" , |
590 | [LP8788_WARM_UP] = "WARM UP" , |
591 | [LP8788_LOW_INPUT] = "LOW INPUT STATE" , |
592 | [LP8788_PRECHARGE] = "CHARGING - PRECHARGE" , |
593 | [LP8788_CC] = "CHARGING - CC" , |
594 | [LP8788_CV] = "CHARGING - CV" , |
595 | [LP8788_MAINTENANCE] = "NO CHARGING - MAINTENANCE" , |
596 | [LP8788_BATTERY_FAULT] = "BATTERY FAULT" , |
597 | [LP8788_SYSTEM_SUPPORT] = "SYSTEM SUPPORT" , |
598 | [LP8788_HIGH_CURRENT] = "HIGH CURRENT" , |
599 | }; |
600 | u8 data; |
601 | |
602 | lp8788_read_byte(lp: pchg->lp, LP8788_CHG_STATUS, data: &data); |
603 | state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S; |
604 | |
605 | return sysfs_emit(buf, fmt: "%s\n" , desc[state]); |
606 | } |
607 | |
608 | static ssize_t lp8788_show_eoc_time(struct device *dev, |
609 | struct device_attribute *attr, char *buf) |
610 | { |
611 | struct lp8788_charger *pchg = dev_get_drvdata(dev); |
612 | static const char * const stime[] = { |
613 | "400ms" , "5min" , "10min" , "15min" , |
614 | "20min" , "25min" , "30min" , "No timeout" |
615 | }; |
616 | u8 val; |
617 | |
618 | lp8788_read_byte(lp: pchg->lp, LP8788_CHG_EOC, data: &val); |
619 | val = (val & LP8788_CHG_EOC_TIME_M) >> LP8788_CHG_EOC_TIME_S; |
620 | |
621 | return sysfs_emit(buf, fmt: "End Of Charge Time: %s\n" , stime[val]); |
622 | } |
623 | |
624 | static ssize_t lp8788_show_eoc_level(struct device *dev, |
625 | struct device_attribute *attr, char *buf) |
626 | { |
627 | struct lp8788_charger *pchg = dev_get_drvdata(dev); |
628 | static const char * const abs_level[] = { |
629 | "25mA" , "49mA" , "75mA" , "98mA" |
630 | }; |
631 | static const char * const relative_level[] = { |
632 | "5%" , "10%" , "15%" , "20%" |
633 | }; |
634 | const char *level; |
635 | u8 val; |
636 | u8 mode; |
637 | |
638 | lp8788_read_byte(lp: pchg->lp, LP8788_CHG_EOC, data: &val); |
639 | |
640 | mode = val & LP8788_CHG_EOC_MODE_M; |
641 | val = (val & LP8788_CHG_EOC_LEVEL_M) >> LP8788_CHG_EOC_LEVEL_S; |
642 | level = mode ? abs_level[val] : relative_level[val]; |
643 | |
644 | return sysfs_emit(buf, fmt: "End Of Charge Level: %s\n" , level); |
645 | } |
646 | |
647 | static DEVICE_ATTR(charger_status, S_IRUSR, lp8788_show_charger_status, NULL); |
648 | static DEVICE_ATTR(eoc_time, S_IRUSR, lp8788_show_eoc_time, NULL); |
649 | static DEVICE_ATTR(eoc_level, S_IRUSR, lp8788_show_eoc_level, NULL); |
650 | |
651 | static struct attribute *lp8788_charger_sysfs_attrs[] = { |
652 | &dev_attr_charger_status.attr, |
653 | &dev_attr_eoc_time.attr, |
654 | &dev_attr_eoc_level.attr, |
655 | NULL, |
656 | }; |
657 | |
658 | ATTRIBUTE_GROUPS(lp8788_charger_sysfs); |
659 | |
660 | static int lp8788_psy_register(struct platform_device *pdev, |
661 | struct lp8788_charger *pchg) |
662 | { |
663 | struct power_supply_config charger_cfg = {}; |
664 | |
665 | charger_cfg.attr_grp = lp8788_charger_sysfs_groups; |
666 | charger_cfg.supplied_to = battery_supplied_to; |
667 | charger_cfg.num_supplicants = ARRAY_SIZE(battery_supplied_to); |
668 | |
669 | pchg->charger = power_supply_register(parent: &pdev->dev, |
670 | desc: &lp8788_psy_charger_desc, |
671 | cfg: &charger_cfg); |
672 | if (IS_ERR(ptr: pchg->charger)) |
673 | return -EPERM; |
674 | |
675 | pchg->battery = power_supply_register(parent: &pdev->dev, |
676 | desc: &lp8788_psy_battery_desc, NULL); |
677 | if (IS_ERR(ptr: pchg->battery)) { |
678 | power_supply_unregister(psy: pchg->charger); |
679 | return -EPERM; |
680 | } |
681 | |
682 | return 0; |
683 | } |
684 | |
685 | static int lp8788_charger_probe(struct platform_device *pdev) |
686 | { |
687 | struct lp8788 *lp = dev_get_drvdata(dev: pdev->dev.parent); |
688 | struct lp8788_charger *pchg; |
689 | struct device *dev = &pdev->dev; |
690 | int ret; |
691 | |
692 | pchg = devm_kzalloc(dev, size: sizeof(struct lp8788_charger), GFP_KERNEL); |
693 | if (!pchg) |
694 | return -ENOMEM; |
695 | |
696 | pchg->lp = lp; |
697 | pchg->pdata = lp->pdata ? lp->pdata->chg_pdata : NULL; |
698 | platform_set_drvdata(pdev, data: pchg); |
699 | |
700 | ret = lp8788_update_charger_params(pdev, pchg); |
701 | if (ret) |
702 | return ret; |
703 | |
704 | lp8788_setup_adc_channel(dev: &pdev->dev, pchg); |
705 | |
706 | ret = lp8788_psy_register(pdev, pchg); |
707 | if (ret) |
708 | return ret; |
709 | |
710 | ret = lp8788_irq_register(pdev, pchg); |
711 | if (ret) |
712 | dev_warn(dev, "failed to register charger irq: %d\n" , ret); |
713 | |
714 | return 0; |
715 | } |
716 | |
717 | static void lp8788_charger_remove(struct platform_device *pdev) |
718 | { |
719 | struct lp8788_charger *pchg = platform_get_drvdata(pdev); |
720 | |
721 | flush_work(work: &pchg->charger_work); |
722 | lp8788_irq_unregister(pdev, pchg); |
723 | lp8788_psy_unregister(pchg); |
724 | } |
725 | |
726 | static struct platform_driver lp8788_charger_driver = { |
727 | .probe = lp8788_charger_probe, |
728 | .remove_new = lp8788_charger_remove, |
729 | .driver = { |
730 | .name = LP8788_DEV_CHARGER, |
731 | }, |
732 | }; |
733 | module_platform_driver(lp8788_charger_driver); |
734 | |
735 | MODULE_DESCRIPTION("TI LP8788 Charger Driver" ); |
736 | MODULE_AUTHOR("Milo Kim" ); |
737 | MODULE_LICENSE("GPL" ); |
738 | MODULE_ALIAS("platform:lp8788-charger" ); |
739 | |