Commit | Line | Data |
---|---|---|
ce773992 DS |
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/err.h> | |
21 | #include <linux/gpio.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/of_gpio.h> | |
29 | #include <linux/power_supply.h> | |
30 | #include <linux/slab.h> | |
31 | ||
32 | #include <linux/power/bq24735-charger.h> | |
33 | ||
34 | #define BQ24735_CHG_OPT 0x12 | |
35 | #define BQ24735_CHG_OPT_CHARGE_DISABLE (1 << 0) | |
36 | #define BQ24735_CHG_OPT_AC_PRESENT (1 << 4) | |
37 | #define BQ24735_CHARGE_CURRENT 0x14 | |
38 | #define BQ24735_CHARGE_CURRENT_MASK 0x1fc0 | |
39 | #define BQ24735_CHARGE_VOLTAGE 0x15 | |
40 | #define BQ24735_CHARGE_VOLTAGE_MASK 0x7ff0 | |
41 | #define BQ24735_INPUT_CURRENT 0x3f | |
42 | #define BQ24735_INPUT_CURRENT_MASK 0x1f80 | |
43 | #define BQ24735_MANUFACTURER_ID 0xfe | |
44 | #define BQ24735_DEVICE_ID 0xff | |
45 | ||
46 | struct bq24735 { | |
297d716f KK |
47 | struct power_supply *charger; |
48 | struct power_supply_desc charger_desc; | |
49 | struct i2c_client *client; | |
50 | struct bq24735_platform *pdata; | |
5b7a0187 PR |
51 | struct mutex lock; |
52 | bool charging; | |
ce773992 DS |
53 | }; |
54 | ||
55 | static inline struct bq24735 *to_bq24735(struct power_supply *psy) | |
56 | { | |
297d716f | 57 | return power_supply_get_drvdata(psy); |
ce773992 DS |
58 | } |
59 | ||
60 | static enum power_supply_property bq24735_charger_properties[] = { | |
5b7a0187 | 61 | POWER_SUPPLY_PROP_STATUS, |
ce773992 DS |
62 | POWER_SUPPLY_PROP_ONLINE, |
63 | }; | |
64 | ||
5b7a0187 PR |
65 | static int bq24735_charger_property_is_writeable(struct power_supply *psy, |
66 | enum power_supply_property psp) | |
67 | { | |
68 | switch (psp) { | |
69 | case POWER_SUPPLY_PROP_STATUS: | |
70 | return 1; | |
71 | default: | |
72 | break; | |
73 | } | |
74 | ||
75 | return 0; | |
76 | } | |
77 | ||
ce773992 DS |
78 | static inline int bq24735_write_word(struct i2c_client *client, u8 reg, |
79 | u16 value) | |
80 | { | |
81 | return i2c_smbus_write_word_data(client, reg, le16_to_cpu(value)); | |
82 | } | |
83 | ||
84 | static inline int bq24735_read_word(struct i2c_client *client, u8 reg) | |
85 | { | |
86 | s32 ret = i2c_smbus_read_word_data(client, reg); | |
87 | ||
88 | return ret < 0 ? ret : le16_to_cpu(ret); | |
89 | } | |
90 | ||
91 | static int bq24735_update_word(struct i2c_client *client, u8 reg, | |
92 | u16 mask, u16 value) | |
93 | { | |
94 | unsigned int tmp; | |
95 | int ret; | |
96 | ||
97 | ret = bq24735_read_word(client, reg); | |
98 | if (ret < 0) | |
99 | return ret; | |
100 | ||
101 | tmp = ret & ~mask; | |
102 | tmp |= value & mask; | |
103 | ||
104 | return bq24735_write_word(client, reg, tmp); | |
105 | } | |
106 | ||
107 | static inline int bq24735_enable_charging(struct bq24735 *charger) | |
108 | { | |
64024ac7 JT |
109 | if (charger->pdata->ext_control) |
110 | return 0; | |
111 | ||
ce773992 DS |
112 | return bq24735_update_word(charger->client, BQ24735_CHG_OPT, |
113 | BQ24735_CHG_OPT_CHARGE_DISABLE, | |
114 | ~BQ24735_CHG_OPT_CHARGE_DISABLE); | |
115 | } | |
116 | ||
117 | static inline int bq24735_disable_charging(struct bq24735 *charger) | |
118 | { | |
64024ac7 JT |
119 | if (charger->pdata->ext_control) |
120 | return 0; | |
121 | ||
ce773992 DS |
122 | return bq24735_update_word(charger->client, BQ24735_CHG_OPT, |
123 | BQ24735_CHG_OPT_CHARGE_DISABLE, | |
124 | BQ24735_CHG_OPT_CHARGE_DISABLE); | |
125 | } | |
126 | ||
127 | static int bq24735_config_charger(struct bq24735 *charger) | |
128 | { | |
129 | struct bq24735_platform *pdata = charger->pdata; | |
130 | int ret; | |
131 | u16 value; | |
132 | ||
64024ac7 JT |
133 | if (pdata->ext_control) |
134 | return 0; | |
135 | ||
ce773992 DS |
136 | if (pdata->charge_current) { |
137 | value = pdata->charge_current & BQ24735_CHARGE_CURRENT_MASK; | |
138 | ||
139 | ret = bq24735_write_word(charger->client, | |
140 | BQ24735_CHARGE_CURRENT, value); | |
141 | if (ret < 0) { | |
142 | dev_err(&charger->client->dev, | |
143 | "Failed to write charger current : %d\n", | |
144 | ret); | |
145 | return ret; | |
146 | } | |
147 | } | |
148 | ||
149 | if (pdata->charge_voltage) { | |
150 | value = pdata->charge_voltage & BQ24735_CHARGE_VOLTAGE_MASK; | |
151 | ||
152 | ret = bq24735_write_word(charger->client, | |
153 | BQ24735_CHARGE_VOLTAGE, value); | |
154 | if (ret < 0) { | |
155 | dev_err(&charger->client->dev, | |
156 | "Failed to write charger voltage : %d\n", | |
157 | ret); | |
158 | return ret; | |
159 | } | |
160 | } | |
161 | ||
162 | if (pdata->input_current) { | |
163 | value = pdata->input_current & BQ24735_INPUT_CURRENT_MASK; | |
164 | ||
165 | ret = bq24735_write_word(charger->client, | |
166 | BQ24735_INPUT_CURRENT, value); | |
167 | if (ret < 0) { | |
168 | dev_err(&charger->client->dev, | |
169 | "Failed to write input current : %d\n", | |
170 | ret); | |
171 | return ret; | |
172 | } | |
173 | } | |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
178 | static bool bq24735_charger_is_present(struct bq24735 *charger) | |
179 | { | |
180 | struct bq24735_platform *pdata = charger->pdata; | |
181 | int ret; | |
182 | ||
183 | if (pdata->status_gpio_valid) { | |
184 | ret = gpio_get_value_cansleep(pdata->status_gpio); | |
185 | return ret ^= pdata->status_gpio_active_low == 0; | |
186 | } else { | |
187 | int ac = 0; | |
188 | ||
189 | ac = bq24735_read_word(charger->client, BQ24735_CHG_OPT); | |
190 | if (ac < 0) { | |
191 | dev_err(&charger->client->dev, | |
192 | "Failed to read charger options : %d\n", | |
193 | ac); | |
194 | return false; | |
195 | } | |
196 | return (ac & BQ24735_CHG_OPT_AC_PRESENT) ? true : false; | |
197 | } | |
198 | ||
199 | return false; | |
200 | } | |
201 | ||
5b7a0187 PR |
202 | static int bq24735_charger_is_charging(struct bq24735 *charger) |
203 | { | |
204 | int ret = bq24735_read_word(charger->client, BQ24735_CHG_OPT); | |
205 | ||
206 | if (ret < 0) | |
207 | return ret; | |
208 | ||
209 | return !(ret & BQ24735_CHG_OPT_CHARGE_DISABLE); | |
210 | } | |
211 | ||
ce773992 DS |
212 | static irqreturn_t bq24735_charger_isr(int irq, void *devid) |
213 | { | |
214 | struct power_supply *psy = devid; | |
215 | struct bq24735 *charger = to_bq24735(psy); | |
216 | ||
5b7a0187 PR |
217 | mutex_lock(&charger->lock); |
218 | ||
219 | if (charger->charging && bq24735_charger_is_present(charger)) | |
ce773992 DS |
220 | bq24735_enable_charging(charger); |
221 | else | |
222 | bq24735_disable_charging(charger); | |
223 | ||
5b7a0187 PR |
224 | mutex_unlock(&charger->lock); |
225 | ||
ce773992 DS |
226 | power_supply_changed(psy); |
227 | ||
228 | return IRQ_HANDLED; | |
229 | } | |
230 | ||
231 | static int bq24735_charger_get_property(struct power_supply *psy, | |
232 | enum power_supply_property psp, | |
233 | union power_supply_propval *val) | |
234 | { | |
297d716f | 235 | struct bq24735 *charger = to_bq24735(psy); |
ce773992 DS |
236 | |
237 | switch (psp) { | |
238 | case POWER_SUPPLY_PROP_ONLINE: | |
239 | val->intval = bq24735_charger_is_present(charger) ? 1 : 0; | |
240 | break; | |
5b7a0187 PR |
241 | case POWER_SUPPLY_PROP_STATUS: |
242 | switch (bq24735_charger_is_charging(charger)) { | |
243 | case 1: | |
244 | val->intval = POWER_SUPPLY_STATUS_CHARGING; | |
245 | break; | |
246 | case 0: | |
247 | val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; | |
248 | break; | |
249 | default: | |
250 | val->intval = POWER_SUPPLY_STATUS_UNKNOWN; | |
251 | break; | |
252 | } | |
253 | break; | |
ce773992 DS |
254 | default: |
255 | return -EINVAL; | |
256 | } | |
257 | ||
258 | return 0; | |
259 | } | |
260 | ||
5b7a0187 PR |
261 | static int bq24735_charger_set_property(struct power_supply *psy, |
262 | enum power_supply_property psp, | |
263 | const union power_supply_propval *val) | |
264 | { | |
265 | struct bq24735 *charger = to_bq24735(psy); | |
266 | int ret; | |
267 | ||
268 | switch (psp) { | |
269 | case POWER_SUPPLY_PROP_STATUS: | |
270 | switch (val->intval) { | |
271 | case POWER_SUPPLY_STATUS_CHARGING: | |
272 | mutex_lock(&charger->lock); | |
273 | charger->charging = true; | |
274 | ret = bq24735_enable_charging(charger); | |
275 | mutex_unlock(&charger->lock); | |
276 | if (ret) | |
277 | return ret; | |
278 | bq24735_config_charger(charger); | |
279 | break; | |
280 | case POWER_SUPPLY_STATUS_DISCHARGING: | |
281 | case POWER_SUPPLY_STATUS_NOT_CHARGING: | |
282 | mutex_lock(&charger->lock); | |
283 | charger->charging = false; | |
284 | ret = bq24735_disable_charging(charger); | |
285 | mutex_unlock(&charger->lock); | |
286 | if (ret) | |
287 | return ret; | |
288 | break; | |
289 | default: | |
290 | return -EINVAL; | |
291 | } | |
292 | power_supply_changed(psy); | |
293 | break; | |
294 | default: | |
295 | return -EPERM; | |
296 | } | |
297 | ||
298 | return 0; | |
299 | } | |
300 | ||
ce773992 DS |
301 | static struct bq24735_platform *bq24735_parse_dt_data(struct i2c_client *client) |
302 | { | |
303 | struct bq24735_platform *pdata; | |
304 | struct device_node *np = client->dev.of_node; | |
305 | u32 val; | |
306 | int ret; | |
307 | enum of_gpio_flags flags; | |
308 | ||
309 | pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL); | |
310 | if (!pdata) { | |
311 | dev_err(&client->dev, | |
312 | "Memory alloc for bq24735 pdata failed\n"); | |
313 | return NULL; | |
314 | } | |
315 | ||
316 | pdata->status_gpio = of_get_named_gpio_flags(np, "ti,ac-detect-gpios", | |
317 | 0, &flags); | |
318 | ||
319 | if (flags & OF_GPIO_ACTIVE_LOW) | |
320 | pdata->status_gpio_active_low = 1; | |
321 | ||
322 | ret = of_property_read_u32(np, "ti,charge-current", &val); | |
323 | if (!ret) | |
324 | pdata->charge_current = val; | |
325 | ||
326 | ret = of_property_read_u32(np, "ti,charge-voltage", &val); | |
327 | if (!ret) | |
328 | pdata->charge_voltage = val; | |
329 | ||
330 | ret = of_property_read_u32(np, "ti,input-current", &val); | |
331 | if (!ret) | |
332 | pdata->input_current = val; | |
333 | ||
64024ac7 JT |
334 | pdata->ext_control = of_property_read_bool(np, "ti,external-control"); |
335 | ||
ce773992 DS |
336 | return pdata; |
337 | } | |
338 | ||
339 | static int bq24735_charger_probe(struct i2c_client *client, | |
340 | const struct i2c_device_id *id) | |
341 | { | |
342 | int ret; | |
343 | struct bq24735 *charger; | |
297d716f | 344 | struct power_supply_desc *supply_desc; |
2dc9215d | 345 | struct power_supply_config psy_cfg = {}; |
ce773992 DS |
346 | char *name; |
347 | ||
348 | charger = devm_kzalloc(&client->dev, sizeof(*charger), GFP_KERNEL); | |
349 | if (!charger) | |
350 | return -ENOMEM; | |
351 | ||
5b7a0187 PR |
352 | mutex_init(&charger->lock); |
353 | charger->charging = true; | |
ce773992 DS |
354 | charger->pdata = client->dev.platform_data; |
355 | ||
356 | if (IS_ENABLED(CONFIG_OF) && !charger->pdata && client->dev.of_node) | |
357 | charger->pdata = bq24735_parse_dt_data(client); | |
358 | ||
359 | if (!charger->pdata) { | |
360 | dev_err(&client->dev, "no platform data provided\n"); | |
361 | return -EINVAL; | |
362 | } | |
363 | ||
364 | name = (char *)charger->pdata->name; | |
365 | if (!name) { | |
71a5a508 VT |
366 | name = devm_kasprintf(&client->dev, GFP_KERNEL, |
367 | "bq24735@%s", | |
368 | dev_name(&client->dev)); | |
ce773992 DS |
369 | if (!name) { |
370 | dev_err(&client->dev, "Failed to alloc device name\n"); | |
371 | return -ENOMEM; | |
372 | } | |
373 | } | |
374 | ||
375 | charger->client = client; | |
376 | ||
297d716f | 377 | supply_desc = &charger->charger_desc; |
ce773992 | 378 | |
297d716f KK |
379 | supply_desc->name = name; |
380 | supply_desc->type = POWER_SUPPLY_TYPE_MAINS; | |
381 | supply_desc->properties = bq24735_charger_properties; | |
382 | supply_desc->num_properties = ARRAY_SIZE(bq24735_charger_properties); | |
383 | supply_desc->get_property = bq24735_charger_get_property; | |
5b7a0187 PR |
384 | supply_desc->set_property = bq24735_charger_set_property; |
385 | supply_desc->property_is_writeable = | |
386 | bq24735_charger_property_is_writeable; | |
2dc9215d KK |
387 | |
388 | psy_cfg.supplied_to = charger->pdata->supplied_to; | |
389 | psy_cfg.num_supplicants = charger->pdata->num_supplicants; | |
390 | psy_cfg.of_node = client->dev.of_node; | |
297d716f | 391 | psy_cfg.drv_data = charger; |
ce773992 DS |
392 | |
393 | i2c_set_clientdata(client, charger); | |
394 | ||
ce773992 DS |
395 | if (gpio_is_valid(charger->pdata->status_gpio)) { |
396 | ret = devm_gpio_request(&client->dev, | |
397 | charger->pdata->status_gpio, | |
398 | name); | |
399 | if (ret) { | |
400 | dev_err(&client->dev, | |
401 | "Failed GPIO request for GPIO %d: %d\n", | |
402 | charger->pdata->status_gpio, ret); | |
403 | } | |
404 | ||
405 | charger->pdata->status_gpio_valid = !ret; | |
406 | } | |
407 | ||
1a3adce1 JT |
408 | if (!charger->pdata->status_gpio_valid |
409 | || bq24735_charger_is_present(charger)) { | |
410 | ret = bq24735_read_word(client, BQ24735_MANUFACTURER_ID); | |
411 | if (ret < 0) { | |
412 | dev_err(&client->dev, "Failed to read manufacturer id : %d\n", | |
413 | ret); | |
414 | return ret; | |
415 | } else if (ret != 0x0040) { | |
416 | dev_err(&client->dev, | |
417 | "manufacturer id mismatch. 0x0040 != 0x%04x\n", ret); | |
418 | return -ENODEV; | |
419 | } | |
420 | ||
421 | ret = bq24735_read_word(client, BQ24735_DEVICE_ID); | |
422 | if (ret < 0) { | |
423 | dev_err(&client->dev, "Failed to read device id : %d\n", ret); | |
424 | return ret; | |
425 | } else if (ret != 0x000B) { | |
426 | dev_err(&client->dev, | |
427 | "device id mismatch. 0x000b != 0x%04x\n", ret); | |
428 | return -ENODEV; | |
429 | } | |
430 | } | |
431 | ||
ce773992 DS |
432 | ret = bq24735_config_charger(charger); |
433 | if (ret < 0) { | |
434 | dev_err(&client->dev, "failed in configuring charger"); | |
71a5a508 | 435 | return ret; |
ce773992 DS |
436 | } |
437 | ||
438 | /* check for AC adapter presence */ | |
439 | if (bq24735_charger_is_present(charger)) { | |
440 | ret = bq24735_enable_charging(charger); | |
441 | if (ret < 0) { | |
442 | dev_err(&client->dev, "Failed to enable charging\n"); | |
71a5a508 | 443 | return ret; |
ce773992 DS |
444 | } |
445 | } | |
446 | ||
71a5a508 VT |
447 | charger->charger = devm_power_supply_register(&client->dev, supply_desc, |
448 | &psy_cfg); | |
297d716f KK |
449 | if (IS_ERR(charger->charger)) { |
450 | ret = PTR_ERR(charger->charger); | |
ce773992 DS |
451 | dev_err(&client->dev, "Failed to register power supply: %d\n", |
452 | ret); | |
71a5a508 | 453 | return ret; |
ce773992 DS |
454 | } |
455 | ||
456 | if (client->irq) { | |
457 | ret = devm_request_threaded_irq(&client->dev, client->irq, | |
458 | NULL, bq24735_charger_isr, | |
459 | IRQF_TRIGGER_RISING | | |
460 | IRQF_TRIGGER_FALLING | | |
461 | IRQF_ONESHOT, | |
297d716f KK |
462 | supply_desc->name, |
463 | charger->charger); | |
ce773992 DS |
464 | if (ret) { |
465 | dev_err(&client->dev, | |
466 | "Unable to register IRQ %d err %d\n", | |
467 | client->irq, ret); | |
71a5a508 | 468 | return ret; |
ce773992 DS |
469 | } |
470 | } | |
471 | ||
ce773992 DS |
472 | return 0; |
473 | } | |
474 | ||
475 | static const struct i2c_device_id bq24735_charger_id[] = { | |
476 | { "bq24735-charger", 0 }, | |
477 | {} | |
478 | }; | |
479 | MODULE_DEVICE_TABLE(i2c, bq24735_charger_id); | |
480 | ||
481 | static const struct of_device_id bq24735_match_ids[] = { | |
482 | { .compatible = "ti,bq24735", }, | |
483 | { /* end */ } | |
484 | }; | |
485 | MODULE_DEVICE_TABLE(of, bq24735_match_ids); | |
486 | ||
487 | static struct i2c_driver bq24735_charger_driver = { | |
488 | .driver = { | |
489 | .name = "bq24735-charger", | |
ce773992 DS |
490 | .of_match_table = bq24735_match_ids, |
491 | }, | |
492 | .probe = bq24735_charger_probe, | |
ce773992 DS |
493 | .id_table = bq24735_charger_id, |
494 | }; | |
495 | ||
496 | module_i2c_driver(bq24735_charger_driver); | |
497 | ||
498 | MODULE_DESCRIPTION("bq24735 battery charging driver"); | |
499 | MODULE_AUTHOR("Darbha Sriharsha <dsriharsha@nvidia.com>"); | |
500 | MODULE_LICENSE("GPL v2"); |