Commit | Line | Data |
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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 { | |
47 | struct power_supply charger; | |
48 | struct i2c_client *client; | |
49 | struct bq24735_platform *pdata; | |
50 | }; | |
51 | ||
52 | static inline struct bq24735 *to_bq24735(struct power_supply *psy) | |
53 | { | |
54 | return container_of(psy, struct bq24735, charger); | |
55 | } | |
56 | ||
57 | static enum power_supply_property bq24735_charger_properties[] = { | |
58 | POWER_SUPPLY_PROP_ONLINE, | |
59 | }; | |
60 | ||
61 | static inline int bq24735_write_word(struct i2c_client *client, u8 reg, | |
62 | u16 value) | |
63 | { | |
64 | return i2c_smbus_write_word_data(client, reg, le16_to_cpu(value)); | |
65 | } | |
66 | ||
67 | static inline int bq24735_read_word(struct i2c_client *client, u8 reg) | |
68 | { | |
69 | s32 ret = i2c_smbus_read_word_data(client, reg); | |
70 | ||
71 | return ret < 0 ? ret : le16_to_cpu(ret); | |
72 | } | |
73 | ||
74 | static int bq24735_update_word(struct i2c_client *client, u8 reg, | |
75 | u16 mask, u16 value) | |
76 | { | |
77 | unsigned int tmp; | |
78 | int ret; | |
79 | ||
80 | ret = bq24735_read_word(client, reg); | |
81 | if (ret < 0) | |
82 | return ret; | |
83 | ||
84 | tmp = ret & ~mask; | |
85 | tmp |= value & mask; | |
86 | ||
87 | return bq24735_write_word(client, reg, tmp); | |
88 | } | |
89 | ||
90 | static inline int bq24735_enable_charging(struct bq24735 *charger) | |
91 | { | |
92 | return bq24735_update_word(charger->client, BQ24735_CHG_OPT, | |
93 | BQ24735_CHG_OPT_CHARGE_DISABLE, | |
94 | ~BQ24735_CHG_OPT_CHARGE_DISABLE); | |
95 | } | |
96 | ||
97 | static inline int bq24735_disable_charging(struct bq24735 *charger) | |
98 | { | |
99 | return bq24735_update_word(charger->client, BQ24735_CHG_OPT, | |
100 | BQ24735_CHG_OPT_CHARGE_DISABLE, | |
101 | BQ24735_CHG_OPT_CHARGE_DISABLE); | |
102 | } | |
103 | ||
104 | static int bq24735_config_charger(struct bq24735 *charger) | |
105 | { | |
106 | struct bq24735_platform *pdata = charger->pdata; | |
107 | int ret; | |
108 | u16 value; | |
109 | ||
110 | if (pdata->charge_current) { | |
111 | value = pdata->charge_current & BQ24735_CHARGE_CURRENT_MASK; | |
112 | ||
113 | ret = bq24735_write_word(charger->client, | |
114 | BQ24735_CHARGE_CURRENT, value); | |
115 | if (ret < 0) { | |
116 | dev_err(&charger->client->dev, | |
117 | "Failed to write charger current : %d\n", | |
118 | ret); | |
119 | return ret; | |
120 | } | |
121 | } | |
122 | ||
123 | if (pdata->charge_voltage) { | |
124 | value = pdata->charge_voltage & BQ24735_CHARGE_VOLTAGE_MASK; | |
125 | ||
126 | ret = bq24735_write_word(charger->client, | |
127 | BQ24735_CHARGE_VOLTAGE, value); | |
128 | if (ret < 0) { | |
129 | dev_err(&charger->client->dev, | |
130 | "Failed to write charger voltage : %d\n", | |
131 | ret); | |
132 | return ret; | |
133 | } | |
134 | } | |
135 | ||
136 | if (pdata->input_current) { | |
137 | value = pdata->input_current & BQ24735_INPUT_CURRENT_MASK; | |
138 | ||
139 | ret = bq24735_write_word(charger->client, | |
140 | BQ24735_INPUT_CURRENT, value); | |
141 | if (ret < 0) { | |
142 | dev_err(&charger->client->dev, | |
143 | "Failed to write input current : %d\n", | |
144 | ret); | |
145 | return ret; | |
146 | } | |
147 | } | |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
152 | static bool bq24735_charger_is_present(struct bq24735 *charger) | |
153 | { | |
154 | struct bq24735_platform *pdata = charger->pdata; | |
155 | int ret; | |
156 | ||
157 | if (pdata->status_gpio_valid) { | |
158 | ret = gpio_get_value_cansleep(pdata->status_gpio); | |
159 | return ret ^= pdata->status_gpio_active_low == 0; | |
160 | } else { | |
161 | int ac = 0; | |
162 | ||
163 | ac = bq24735_read_word(charger->client, BQ24735_CHG_OPT); | |
164 | if (ac < 0) { | |
165 | dev_err(&charger->client->dev, | |
166 | "Failed to read charger options : %d\n", | |
167 | ac); | |
168 | return false; | |
169 | } | |
170 | return (ac & BQ24735_CHG_OPT_AC_PRESENT) ? true : false; | |
171 | } | |
172 | ||
173 | return false; | |
174 | } | |
175 | ||
176 | static irqreturn_t bq24735_charger_isr(int irq, void *devid) | |
177 | { | |
178 | struct power_supply *psy = devid; | |
179 | struct bq24735 *charger = to_bq24735(psy); | |
180 | ||
181 | if (bq24735_charger_is_present(charger)) | |
182 | bq24735_enable_charging(charger); | |
183 | else | |
184 | bq24735_disable_charging(charger); | |
185 | ||
186 | power_supply_changed(psy); | |
187 | ||
188 | return IRQ_HANDLED; | |
189 | } | |
190 | ||
191 | static int bq24735_charger_get_property(struct power_supply *psy, | |
192 | enum power_supply_property psp, | |
193 | union power_supply_propval *val) | |
194 | { | |
195 | struct bq24735 *charger; | |
196 | ||
197 | charger = container_of(psy, struct bq24735, charger); | |
198 | ||
199 | switch (psp) { | |
200 | case POWER_SUPPLY_PROP_ONLINE: | |
201 | val->intval = bq24735_charger_is_present(charger) ? 1 : 0; | |
202 | break; | |
203 | default: | |
204 | return -EINVAL; | |
205 | } | |
206 | ||
207 | return 0; | |
208 | } | |
209 | ||
210 | static struct bq24735_platform *bq24735_parse_dt_data(struct i2c_client *client) | |
211 | { | |
212 | struct bq24735_platform *pdata; | |
213 | struct device_node *np = client->dev.of_node; | |
214 | u32 val; | |
215 | int ret; | |
216 | enum of_gpio_flags flags; | |
217 | ||
218 | pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL); | |
219 | if (!pdata) { | |
220 | dev_err(&client->dev, | |
221 | "Memory alloc for bq24735 pdata failed\n"); | |
222 | return NULL; | |
223 | } | |
224 | ||
225 | pdata->status_gpio = of_get_named_gpio_flags(np, "ti,ac-detect-gpios", | |
226 | 0, &flags); | |
227 | ||
228 | if (flags & OF_GPIO_ACTIVE_LOW) | |
229 | pdata->status_gpio_active_low = 1; | |
230 | ||
231 | ret = of_property_read_u32(np, "ti,charge-current", &val); | |
232 | if (!ret) | |
233 | pdata->charge_current = val; | |
234 | ||
235 | ret = of_property_read_u32(np, "ti,charge-voltage", &val); | |
236 | if (!ret) | |
237 | pdata->charge_voltage = val; | |
238 | ||
239 | ret = of_property_read_u32(np, "ti,input-current", &val); | |
240 | if (!ret) | |
241 | pdata->input_current = val; | |
242 | ||
243 | return pdata; | |
244 | } | |
245 | ||
246 | static int bq24735_charger_probe(struct i2c_client *client, | |
247 | const struct i2c_device_id *id) | |
248 | { | |
249 | int ret; | |
250 | struct bq24735 *charger; | |
251 | struct power_supply *supply; | |
252 | char *name; | |
253 | ||
254 | charger = devm_kzalloc(&client->dev, sizeof(*charger), GFP_KERNEL); | |
255 | if (!charger) | |
256 | return -ENOMEM; | |
257 | ||
258 | charger->pdata = client->dev.platform_data; | |
259 | ||
260 | if (IS_ENABLED(CONFIG_OF) && !charger->pdata && client->dev.of_node) | |
261 | charger->pdata = bq24735_parse_dt_data(client); | |
262 | ||
263 | if (!charger->pdata) { | |
264 | dev_err(&client->dev, "no platform data provided\n"); | |
265 | return -EINVAL; | |
266 | } | |
267 | ||
268 | name = (char *)charger->pdata->name; | |
269 | if (!name) { | |
270 | name = kasprintf(GFP_KERNEL, "bq24735@%s", | |
271 | dev_name(&client->dev)); | |
272 | if (!name) { | |
273 | dev_err(&client->dev, "Failed to alloc device name\n"); | |
274 | return -ENOMEM; | |
275 | } | |
276 | } | |
277 | ||
278 | charger->client = client; | |
279 | ||
280 | supply = &charger->charger; | |
281 | ||
282 | supply->name = name; | |
283 | supply->type = POWER_SUPPLY_TYPE_MAINS; | |
284 | supply->properties = bq24735_charger_properties; | |
285 | supply->num_properties = ARRAY_SIZE(bq24735_charger_properties); | |
286 | supply->get_property = bq24735_charger_get_property; | |
287 | supply->supplied_to = charger->pdata->supplied_to; | |
288 | supply->num_supplicants = charger->pdata->num_supplicants; | |
289 | supply->of_node = client->dev.of_node; | |
290 | ||
291 | i2c_set_clientdata(client, charger); | |
292 | ||
293 | ret = bq24735_read_word(client, BQ24735_MANUFACTURER_ID); | |
294 | if (ret < 0) { | |
295 | dev_err(&client->dev, "Failed to read manufacturer id : %d\n", | |
296 | ret); | |
297 | goto err_free_name; | |
298 | } else if (ret != 0x0040) { | |
299 | dev_err(&client->dev, | |
300 | "manufacturer id mismatch. 0x0040 != 0x%04x\n", ret); | |
301 | ret = -ENODEV; | |
302 | goto err_free_name; | |
303 | } | |
304 | ||
305 | ret = bq24735_read_word(client, BQ24735_DEVICE_ID); | |
306 | if (ret < 0) { | |
307 | dev_err(&client->dev, "Failed to read device id : %d\n", ret); | |
308 | goto err_free_name; | |
309 | } else if (ret != 0x000B) { | |
310 | dev_err(&client->dev, | |
311 | "device id mismatch. 0x000b != 0x%04x\n", ret); | |
312 | ret = -ENODEV; | |
313 | goto err_free_name; | |
314 | } | |
315 | ||
316 | if (gpio_is_valid(charger->pdata->status_gpio)) { | |
317 | ret = devm_gpio_request(&client->dev, | |
318 | charger->pdata->status_gpio, | |
319 | name); | |
320 | if (ret) { | |
321 | dev_err(&client->dev, | |
322 | "Failed GPIO request for GPIO %d: %d\n", | |
323 | charger->pdata->status_gpio, ret); | |
324 | } | |
325 | ||
326 | charger->pdata->status_gpio_valid = !ret; | |
327 | } | |
328 | ||
329 | ret = bq24735_config_charger(charger); | |
330 | if (ret < 0) { | |
331 | dev_err(&client->dev, "failed in configuring charger"); | |
332 | goto err_free_name; | |
333 | } | |
334 | ||
335 | /* check for AC adapter presence */ | |
336 | if (bq24735_charger_is_present(charger)) { | |
337 | ret = bq24735_enable_charging(charger); | |
338 | if (ret < 0) { | |
339 | dev_err(&client->dev, "Failed to enable charging\n"); | |
340 | goto err_free_name; | |
341 | } | |
342 | } | |
343 | ||
344 | ret = power_supply_register(&client->dev, supply); | |
345 | if (ret < 0) { | |
346 | dev_err(&client->dev, "Failed to register power supply: %d\n", | |
347 | ret); | |
348 | goto err_free_name; | |
349 | } | |
350 | ||
351 | if (client->irq) { | |
352 | ret = devm_request_threaded_irq(&client->dev, client->irq, | |
353 | NULL, bq24735_charger_isr, | |
354 | IRQF_TRIGGER_RISING | | |
355 | IRQF_TRIGGER_FALLING | | |
356 | IRQF_ONESHOT, | |
357 | supply->name, supply); | |
358 | if (ret) { | |
359 | dev_err(&client->dev, | |
360 | "Unable to register IRQ %d err %d\n", | |
361 | client->irq, ret); | |
362 | goto err_unregister_supply; | |
363 | } | |
364 | } | |
365 | ||
366 | return 0; | |
367 | err_unregister_supply: | |
368 | power_supply_unregister(supply); | |
369 | err_free_name: | |
370 | if (name != charger->pdata->name) | |
371 | kfree(name); | |
372 | ||
373 | return ret; | |
374 | } | |
375 | ||
376 | static int bq24735_charger_remove(struct i2c_client *client) | |
377 | { | |
378 | struct bq24735 *charger = i2c_get_clientdata(client); | |
379 | ||
380 | if (charger->client->irq) | |
381 | devm_free_irq(&charger->client->dev, charger->client->irq, | |
382 | &charger->charger); | |
383 | ||
384 | power_supply_unregister(&charger->charger); | |
385 | ||
386 | if (charger->charger.name != charger->pdata->name) | |
387 | kfree(charger->charger.name); | |
388 | ||
389 | return 0; | |
390 | } | |
391 | ||
392 | static const struct i2c_device_id bq24735_charger_id[] = { | |
393 | { "bq24735-charger", 0 }, | |
394 | {} | |
395 | }; | |
396 | MODULE_DEVICE_TABLE(i2c, bq24735_charger_id); | |
397 | ||
398 | static const struct of_device_id bq24735_match_ids[] = { | |
399 | { .compatible = "ti,bq24735", }, | |
400 | { /* end */ } | |
401 | }; | |
402 | MODULE_DEVICE_TABLE(of, bq24735_match_ids); | |
403 | ||
404 | static struct i2c_driver bq24735_charger_driver = { | |
405 | .driver = { | |
406 | .name = "bq24735-charger", | |
407 | .owner = THIS_MODULE, | |
408 | .of_match_table = bq24735_match_ids, | |
409 | }, | |
410 | .probe = bq24735_charger_probe, | |
411 | .remove = bq24735_charger_remove, | |
412 | .id_table = bq24735_charger_id, | |
413 | }; | |
414 | ||
415 | module_i2c_driver(bq24735_charger_driver); | |
416 | ||
417 | MODULE_DESCRIPTION("bq24735 battery charging driver"); | |
418 | MODULE_AUTHOR("Darbha Sriharsha <dsriharsha@nvidia.com>"); | |
419 | MODULE_LICENSE("GPL v2"); |