1 | /* |
2 | * Battery charger driver for TI BQ24735 |
3 | * |
4 | * Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved. |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License as published by |
8 | * the Free Software Foundation; |
9 | * |
10 | * This program is distributed in the hope that it will be useful, but WITHOUT |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
13 | * more details. |
14 | * |
15 | * You should have received a copy of the GNU General Public License along |
16 | * with this program; if not, write to the Free Software Foundation, Inc., |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
18 | */ |
19 | |
20 | #include <linux/devm-helpers.h> |
21 | #include <linux/err.h> |
22 | #include <linux/i2c.h> |
23 | #include <linux/init.h> |
24 | #include <linux/interrupt.h> |
25 | #include <linux/kernel.h> |
26 | #include <linux/module.h> |
27 | #include <linux/of.h> |
28 | #include <linux/gpio/consumer.h> |
29 | #include <linux/power_supply.h> |
30 | #include <linux/slab.h> |
31 | |
32 | #include <linux/power/bq24735-charger.h> |
33 | |
34 | /* BQ24735 available commands and their respective masks */ |
35 | #define BQ24735_CHARGE_OPT 0x12 |
36 | #define BQ24735_CHARGE_CURRENT 0x14 |
37 | #define BQ24735_CHARGE_CURRENT_MASK 0x1fc0 |
38 | #define BQ24735_CHARGE_VOLTAGE 0x15 |
39 | #define BQ24735_CHARGE_VOLTAGE_MASK 0x7ff0 |
40 | #define BQ24735_INPUT_CURRENT 0x3f |
41 | #define BQ24735_INPUT_CURRENT_MASK 0x1f80 |
42 | #define BQ24735_MANUFACTURER_ID 0xfe |
43 | #define BQ24735_DEVICE_ID 0xff |
44 | |
45 | /* ChargeOptions bits of interest */ |
46 | #define BQ24735_CHARGE_OPT_CHG_DISABLE (1 << 0) |
47 | #define BQ24735_CHARGE_OPT_AC_PRESENT (1 << 4) |
48 | |
49 | struct bq24735 { |
50 | struct power_supply *charger; |
51 | struct power_supply_desc charger_desc; |
52 | struct i2c_client *client; |
53 | struct bq24735_platform *pdata; |
54 | struct mutex lock; |
55 | struct gpio_desc *status_gpio; |
56 | struct delayed_work poll; |
57 | u32 poll_interval; |
58 | bool charging; |
59 | }; |
60 | |
61 | static inline struct bq24735 *to_bq24735(struct power_supply *psy) |
62 | { |
63 | return power_supply_get_drvdata(psy); |
64 | } |
65 | |
66 | static enum power_supply_property bq24735_charger_properties[] = { |
67 | POWER_SUPPLY_PROP_STATUS, |
68 | POWER_SUPPLY_PROP_ONLINE, |
69 | }; |
70 | |
71 | static int bq24735_charger_property_is_writeable(struct power_supply *psy, |
72 | enum power_supply_property psp) |
73 | { |
74 | switch (psp) { |
75 | case POWER_SUPPLY_PROP_STATUS: |
76 | return 1; |
77 | default: |
78 | break; |
79 | } |
80 | |
81 | return 0; |
82 | } |
83 | |
84 | static inline int bq24735_write_word(struct i2c_client *client, u8 reg, |
85 | u16 value) |
86 | { |
87 | return i2c_smbus_write_word_data(client, command: reg, value); |
88 | } |
89 | |
90 | static inline int bq24735_read_word(struct i2c_client *client, u8 reg) |
91 | { |
92 | return i2c_smbus_read_word_data(client, command: reg); |
93 | } |
94 | |
95 | static int bq24735_update_word(struct i2c_client *client, u8 reg, |
96 | u16 mask, u16 value) |
97 | { |
98 | unsigned int tmp; |
99 | int ret; |
100 | |
101 | ret = bq24735_read_word(client, reg); |
102 | if (ret < 0) |
103 | return ret; |
104 | |
105 | tmp = ret & ~mask; |
106 | tmp |= value & mask; |
107 | |
108 | return bq24735_write_word(client, reg, value: tmp); |
109 | } |
110 | |
111 | static int bq24735_config_charger(struct bq24735 *charger) |
112 | { |
113 | struct bq24735_platform *pdata = charger->pdata; |
114 | int ret; |
115 | u16 value; |
116 | |
117 | if (pdata->ext_control) |
118 | return 0; |
119 | |
120 | if (pdata->charge_current) { |
121 | value = pdata->charge_current & BQ24735_CHARGE_CURRENT_MASK; |
122 | |
123 | ret = bq24735_write_word(client: charger->client, |
124 | BQ24735_CHARGE_CURRENT, value); |
125 | if (ret < 0) { |
126 | dev_err(&charger->client->dev, |
127 | "Failed to write charger current : %d\n" , |
128 | ret); |
129 | return ret; |
130 | } |
131 | } |
132 | |
133 | if (pdata->charge_voltage) { |
134 | value = pdata->charge_voltage & BQ24735_CHARGE_VOLTAGE_MASK; |
135 | |
136 | ret = bq24735_write_word(client: charger->client, |
137 | BQ24735_CHARGE_VOLTAGE, value); |
138 | if (ret < 0) { |
139 | dev_err(&charger->client->dev, |
140 | "Failed to write charger voltage : %d\n" , |
141 | ret); |
142 | return ret; |
143 | } |
144 | } |
145 | |
146 | if (pdata->input_current) { |
147 | value = pdata->input_current & BQ24735_INPUT_CURRENT_MASK; |
148 | |
149 | ret = bq24735_write_word(client: charger->client, |
150 | BQ24735_INPUT_CURRENT, value); |
151 | if (ret < 0) { |
152 | dev_err(&charger->client->dev, |
153 | "Failed to write input current : %d\n" , |
154 | ret); |
155 | return ret; |
156 | } |
157 | } |
158 | |
159 | return 0; |
160 | } |
161 | |
162 | static inline int bq24735_enable_charging(struct bq24735 *charger) |
163 | { |
164 | int ret; |
165 | |
166 | if (charger->pdata->ext_control) |
167 | return 0; |
168 | |
169 | ret = bq24735_config_charger(charger); |
170 | if (ret) |
171 | return ret; |
172 | |
173 | return bq24735_update_word(client: charger->client, BQ24735_CHARGE_OPT, |
174 | BQ24735_CHARGE_OPT_CHG_DISABLE, value: 0); |
175 | } |
176 | |
177 | static inline int bq24735_disable_charging(struct bq24735 *charger) |
178 | { |
179 | if (charger->pdata->ext_control) |
180 | return 0; |
181 | |
182 | return bq24735_update_word(client: charger->client, BQ24735_CHARGE_OPT, |
183 | BQ24735_CHARGE_OPT_CHG_DISABLE, |
184 | BQ24735_CHARGE_OPT_CHG_DISABLE); |
185 | } |
186 | |
187 | static bool bq24735_charger_is_present(struct bq24735 *charger) |
188 | { |
189 | if (charger->status_gpio) { |
190 | return !gpiod_get_value_cansleep(desc: charger->status_gpio); |
191 | } else { |
192 | int ac = 0; |
193 | |
194 | ac = bq24735_read_word(client: charger->client, BQ24735_CHARGE_OPT); |
195 | if (ac < 0) { |
196 | dev_dbg(&charger->client->dev, |
197 | "Failed to read charger options : %d\n" , |
198 | ac); |
199 | return false; |
200 | } |
201 | return (ac & BQ24735_CHARGE_OPT_AC_PRESENT) ? true : false; |
202 | } |
203 | |
204 | return false; |
205 | } |
206 | |
207 | static int bq24735_charger_is_charging(struct bq24735 *charger) |
208 | { |
209 | int ret; |
210 | |
211 | if (!bq24735_charger_is_present(charger)) |
212 | return 0; |
213 | |
214 | ret = bq24735_read_word(client: charger->client, BQ24735_CHARGE_OPT); |
215 | if (ret < 0) |
216 | return ret; |
217 | |
218 | return !(ret & BQ24735_CHARGE_OPT_CHG_DISABLE); |
219 | } |
220 | |
221 | static void bq24735_update(struct bq24735 *charger) |
222 | { |
223 | mutex_lock(&charger->lock); |
224 | |
225 | if (charger->charging && bq24735_charger_is_present(charger)) |
226 | bq24735_enable_charging(charger); |
227 | else |
228 | bq24735_disable_charging(charger); |
229 | |
230 | mutex_unlock(lock: &charger->lock); |
231 | |
232 | power_supply_changed(psy: charger->charger); |
233 | } |
234 | |
235 | static irqreturn_t bq24735_charger_isr(int irq, void *devid) |
236 | { |
237 | struct power_supply *psy = devid; |
238 | struct bq24735 *charger = to_bq24735(psy); |
239 | |
240 | bq24735_update(charger); |
241 | |
242 | return IRQ_HANDLED; |
243 | } |
244 | |
245 | static void bq24735_poll(struct work_struct *work) |
246 | { |
247 | struct bq24735 *charger = container_of(work, struct bq24735, poll.work); |
248 | |
249 | bq24735_update(charger); |
250 | |
251 | schedule_delayed_work(dwork: &charger->poll, |
252 | delay: msecs_to_jiffies(m: charger->poll_interval)); |
253 | } |
254 | |
255 | static int bq24735_charger_get_property(struct power_supply *psy, |
256 | enum power_supply_property psp, |
257 | union power_supply_propval *val) |
258 | { |
259 | struct bq24735 *charger = to_bq24735(psy); |
260 | |
261 | switch (psp) { |
262 | case POWER_SUPPLY_PROP_ONLINE: |
263 | val->intval = bq24735_charger_is_present(charger) ? 1 : 0; |
264 | break; |
265 | case POWER_SUPPLY_PROP_STATUS: |
266 | switch (bq24735_charger_is_charging(charger)) { |
267 | case 1: |
268 | val->intval = POWER_SUPPLY_STATUS_CHARGING; |
269 | break; |
270 | case 0: |
271 | val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; |
272 | break; |
273 | default: |
274 | val->intval = POWER_SUPPLY_STATUS_UNKNOWN; |
275 | break; |
276 | } |
277 | break; |
278 | default: |
279 | return -EINVAL; |
280 | } |
281 | |
282 | return 0; |
283 | } |
284 | |
285 | static int bq24735_charger_set_property(struct power_supply *psy, |
286 | enum power_supply_property psp, |
287 | const union power_supply_propval *val) |
288 | { |
289 | struct bq24735 *charger = to_bq24735(psy); |
290 | int ret; |
291 | |
292 | switch (psp) { |
293 | case POWER_SUPPLY_PROP_STATUS: |
294 | switch (val->intval) { |
295 | case POWER_SUPPLY_STATUS_CHARGING: |
296 | mutex_lock(&charger->lock); |
297 | charger->charging = true; |
298 | ret = bq24735_enable_charging(charger); |
299 | mutex_unlock(lock: &charger->lock); |
300 | if (ret) |
301 | return ret; |
302 | break; |
303 | case POWER_SUPPLY_STATUS_DISCHARGING: |
304 | case POWER_SUPPLY_STATUS_NOT_CHARGING: |
305 | mutex_lock(&charger->lock); |
306 | charger->charging = false; |
307 | ret = bq24735_disable_charging(charger); |
308 | mutex_unlock(lock: &charger->lock); |
309 | if (ret) |
310 | return ret; |
311 | break; |
312 | default: |
313 | return -EINVAL; |
314 | } |
315 | power_supply_changed(psy); |
316 | break; |
317 | default: |
318 | return -EPERM; |
319 | } |
320 | |
321 | return 0; |
322 | } |
323 | |
324 | static struct bq24735_platform *bq24735_parse_dt_data(struct i2c_client *client) |
325 | { |
326 | struct bq24735_platform *pdata; |
327 | struct device_node *np = client->dev.of_node; |
328 | u32 val; |
329 | int ret; |
330 | |
331 | pdata = devm_kzalloc(dev: &client->dev, size: sizeof(*pdata), GFP_KERNEL); |
332 | if (!pdata) { |
333 | dev_err(&client->dev, |
334 | "Memory alloc for bq24735 pdata failed\n" ); |
335 | return NULL; |
336 | } |
337 | |
338 | ret = of_property_read_u32(np, propname: "ti,charge-current" , out_value: &val); |
339 | if (!ret) |
340 | pdata->charge_current = val; |
341 | |
342 | ret = of_property_read_u32(np, propname: "ti,charge-voltage" , out_value: &val); |
343 | if (!ret) |
344 | pdata->charge_voltage = val; |
345 | |
346 | ret = of_property_read_u32(np, propname: "ti,input-current" , out_value: &val); |
347 | if (!ret) |
348 | pdata->input_current = val; |
349 | |
350 | pdata->ext_control = of_property_read_bool(np, propname: "ti,external-control" ); |
351 | |
352 | return pdata; |
353 | } |
354 | |
355 | static int bq24735_charger_probe(struct i2c_client *client) |
356 | { |
357 | int ret; |
358 | struct bq24735 *charger; |
359 | struct power_supply_desc *supply_desc; |
360 | struct power_supply_config psy_cfg = {}; |
361 | char *name; |
362 | |
363 | charger = devm_kzalloc(dev: &client->dev, size: sizeof(*charger), GFP_KERNEL); |
364 | if (!charger) |
365 | return -ENOMEM; |
366 | |
367 | mutex_init(&charger->lock); |
368 | charger->charging = true; |
369 | charger->pdata = client->dev.platform_data; |
370 | |
371 | if (IS_ENABLED(CONFIG_OF) && !charger->pdata && client->dev.of_node) |
372 | charger->pdata = bq24735_parse_dt_data(client); |
373 | |
374 | if (!charger->pdata) { |
375 | dev_err(&client->dev, "no platform data provided\n" ); |
376 | return -EINVAL; |
377 | } |
378 | |
379 | name = (char *)charger->pdata->name; |
380 | if (!name) { |
381 | name = devm_kasprintf(dev: &client->dev, GFP_KERNEL, |
382 | fmt: "bq24735@%s" , |
383 | dev_name(dev: &client->dev)); |
384 | if (!name) { |
385 | dev_err(&client->dev, "Failed to alloc device name\n" ); |
386 | return -ENOMEM; |
387 | } |
388 | } |
389 | |
390 | charger->client = client; |
391 | |
392 | supply_desc = &charger->charger_desc; |
393 | |
394 | supply_desc->name = name; |
395 | supply_desc->type = POWER_SUPPLY_TYPE_MAINS; |
396 | supply_desc->properties = bq24735_charger_properties; |
397 | supply_desc->num_properties = ARRAY_SIZE(bq24735_charger_properties); |
398 | supply_desc->get_property = bq24735_charger_get_property; |
399 | supply_desc->set_property = bq24735_charger_set_property; |
400 | supply_desc->property_is_writeable = |
401 | bq24735_charger_property_is_writeable; |
402 | |
403 | psy_cfg.supplied_to = charger->pdata->supplied_to; |
404 | psy_cfg.num_supplicants = charger->pdata->num_supplicants; |
405 | psy_cfg.of_node = client->dev.of_node; |
406 | psy_cfg.drv_data = charger; |
407 | |
408 | i2c_set_clientdata(client, data: charger); |
409 | |
410 | charger->status_gpio = devm_gpiod_get_optional(dev: &client->dev, |
411 | con_id: "ti,ac-detect" , |
412 | flags: GPIOD_IN); |
413 | if (IS_ERR(ptr: charger->status_gpio)) { |
414 | ret = PTR_ERR(ptr: charger->status_gpio); |
415 | dev_err(&client->dev, "Getting gpio failed: %d\n" , ret); |
416 | return ret; |
417 | } |
418 | |
419 | if (bq24735_charger_is_present(charger)) { |
420 | ret = bq24735_read_word(client, BQ24735_MANUFACTURER_ID); |
421 | if (ret < 0) { |
422 | dev_err(&client->dev, "Failed to read manufacturer id : %d\n" , |
423 | ret); |
424 | return ret; |
425 | } else if (ret != 0x0040) { |
426 | dev_err(&client->dev, |
427 | "manufacturer id mismatch. 0x0040 != 0x%04x\n" , ret); |
428 | return -ENODEV; |
429 | } |
430 | |
431 | ret = bq24735_read_word(client, BQ24735_DEVICE_ID); |
432 | if (ret < 0) { |
433 | dev_err(&client->dev, "Failed to read device id : %d\n" , ret); |
434 | return ret; |
435 | } else if (ret != 0x000B) { |
436 | dev_err(&client->dev, |
437 | "device id mismatch. 0x000b != 0x%04x\n" , ret); |
438 | return -ENODEV; |
439 | } |
440 | |
441 | ret = bq24735_enable_charging(charger); |
442 | if (ret < 0) { |
443 | dev_err(&client->dev, "Failed to enable charging\n" ); |
444 | return ret; |
445 | } |
446 | } |
447 | |
448 | charger->charger = devm_power_supply_register(parent: &client->dev, desc: supply_desc, |
449 | cfg: &psy_cfg); |
450 | if (IS_ERR(ptr: charger->charger)) { |
451 | ret = PTR_ERR(ptr: charger->charger); |
452 | dev_err(&client->dev, "Failed to register power supply: %d\n" , |
453 | ret); |
454 | return ret; |
455 | } |
456 | |
457 | if (client->irq) { |
458 | ret = devm_request_threaded_irq(dev: &client->dev, irq: client->irq, |
459 | NULL, thread_fn: bq24735_charger_isr, |
460 | IRQF_TRIGGER_RISING | |
461 | IRQF_TRIGGER_FALLING | |
462 | IRQF_ONESHOT, |
463 | devname: supply_desc->name, |
464 | dev_id: charger->charger); |
465 | if (ret) { |
466 | dev_err(&client->dev, |
467 | "Unable to register IRQ %d err %d\n" , |
468 | client->irq, ret); |
469 | return ret; |
470 | } |
471 | } else { |
472 | ret = device_property_read_u32(dev: &client->dev, propname: "poll-interval" , |
473 | val: &charger->poll_interval); |
474 | if (ret) |
475 | return 0; |
476 | if (!charger->poll_interval) |
477 | return 0; |
478 | |
479 | ret = devm_delayed_work_autocancel(dev: &client->dev, w: &charger->poll, |
480 | worker: bq24735_poll); |
481 | if (ret) |
482 | return ret; |
483 | |
484 | schedule_delayed_work(dwork: &charger->poll, |
485 | delay: msecs_to_jiffies(m: charger->poll_interval)); |
486 | } |
487 | |
488 | return 0; |
489 | } |
490 | |
491 | static const struct i2c_device_id bq24735_charger_id[] = { |
492 | { "bq24735-charger" , 0 }, |
493 | {} |
494 | }; |
495 | MODULE_DEVICE_TABLE(i2c, bq24735_charger_id); |
496 | |
497 | static const struct of_device_id bq24735_match_ids[] = { |
498 | { .compatible = "ti,bq24735" , }, |
499 | { /* end */ } |
500 | }; |
501 | MODULE_DEVICE_TABLE(of, bq24735_match_ids); |
502 | |
503 | static struct i2c_driver bq24735_charger_driver = { |
504 | .driver = { |
505 | .name = "bq24735-charger" , |
506 | .of_match_table = bq24735_match_ids, |
507 | }, |
508 | .probe = bq24735_charger_probe, |
509 | .id_table = bq24735_charger_id, |
510 | }; |
511 | |
512 | module_i2c_driver(bq24735_charger_driver); |
513 | |
514 | MODULE_DESCRIPTION("bq24735 battery charging driver" ); |
515 | MODULE_AUTHOR("Darbha Sriharsha <dsriharsha@nvidia.com>" ); |
516 | MODULE_LICENSE("GPL v2" ); |
517 | |