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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 { | |
297d716f KK |
47 | struct power_supply *charger; |
48 | struct power_supply_desc charger_desc; | |
49 | struct i2c_client *client; | |
50 | struct bq24735_platform *pdata; | |
ce773992 DS |
51 | }; |
52 | ||
53 | static inline struct bq24735 *to_bq24735(struct power_supply *psy) | |
54 | { | |
297d716f | 55 | return power_supply_get_drvdata(psy); |
ce773992 DS |
56 | } |
57 | ||
58 | static enum power_supply_property bq24735_charger_properties[] = { | |
59 | POWER_SUPPLY_PROP_ONLINE, | |
60 | }; | |
61 | ||
62 | static inline int bq24735_write_word(struct i2c_client *client, u8 reg, | |
63 | u16 value) | |
64 | { | |
65 | return i2c_smbus_write_word_data(client, reg, le16_to_cpu(value)); | |
66 | } | |
67 | ||
68 | static inline int bq24735_read_word(struct i2c_client *client, u8 reg) | |
69 | { | |
70 | s32 ret = i2c_smbus_read_word_data(client, reg); | |
71 | ||
72 | return ret < 0 ? ret : le16_to_cpu(ret); | |
73 | } | |
74 | ||
75 | static int bq24735_update_word(struct i2c_client *client, u8 reg, | |
76 | u16 mask, u16 value) | |
77 | { | |
78 | unsigned int tmp; | |
79 | int ret; | |
80 | ||
81 | ret = bq24735_read_word(client, reg); | |
82 | if (ret < 0) | |
83 | return ret; | |
84 | ||
85 | tmp = ret & ~mask; | |
86 | tmp |= value & mask; | |
87 | ||
88 | return bq24735_write_word(client, reg, tmp); | |
89 | } | |
90 | ||
91 | static inline int bq24735_enable_charging(struct bq24735 *charger) | |
92 | { | |
93 | return bq24735_update_word(charger->client, BQ24735_CHG_OPT, | |
94 | BQ24735_CHG_OPT_CHARGE_DISABLE, | |
95 | ~BQ24735_CHG_OPT_CHARGE_DISABLE); | |
96 | } | |
97 | ||
98 | static inline int bq24735_disable_charging(struct bq24735 *charger) | |
99 | { | |
100 | return bq24735_update_word(charger->client, BQ24735_CHG_OPT, | |
101 | BQ24735_CHG_OPT_CHARGE_DISABLE, | |
102 | BQ24735_CHG_OPT_CHARGE_DISABLE); | |
103 | } | |
104 | ||
105 | static int bq24735_config_charger(struct bq24735 *charger) | |
106 | { | |
107 | struct bq24735_platform *pdata = charger->pdata; | |
108 | int ret; | |
109 | u16 value; | |
110 | ||
111 | if (pdata->charge_current) { | |
112 | value = pdata->charge_current & BQ24735_CHARGE_CURRENT_MASK; | |
113 | ||
114 | ret = bq24735_write_word(charger->client, | |
115 | BQ24735_CHARGE_CURRENT, value); | |
116 | if (ret < 0) { | |
117 | dev_err(&charger->client->dev, | |
118 | "Failed to write charger current : %d\n", | |
119 | ret); | |
120 | return ret; | |
121 | } | |
122 | } | |
123 | ||
124 | if (pdata->charge_voltage) { | |
125 | value = pdata->charge_voltage & BQ24735_CHARGE_VOLTAGE_MASK; | |
126 | ||
127 | ret = bq24735_write_word(charger->client, | |
128 | BQ24735_CHARGE_VOLTAGE, value); | |
129 | if (ret < 0) { | |
130 | dev_err(&charger->client->dev, | |
131 | "Failed to write charger voltage : %d\n", | |
132 | ret); | |
133 | return ret; | |
134 | } | |
135 | } | |
136 | ||
137 | if (pdata->input_current) { | |
138 | value = pdata->input_current & BQ24735_INPUT_CURRENT_MASK; | |
139 | ||
140 | ret = bq24735_write_word(charger->client, | |
141 | BQ24735_INPUT_CURRENT, value); | |
142 | if (ret < 0) { | |
143 | dev_err(&charger->client->dev, | |
144 | "Failed to write input current : %d\n", | |
145 | ret); | |
146 | return ret; | |
147 | } | |
148 | } | |
149 | ||
150 | return 0; | |
151 | } | |
152 | ||
153 | static bool bq24735_charger_is_present(struct bq24735 *charger) | |
154 | { | |
155 | struct bq24735_platform *pdata = charger->pdata; | |
156 | int ret; | |
157 | ||
158 | if (pdata->status_gpio_valid) { | |
159 | ret = gpio_get_value_cansleep(pdata->status_gpio); | |
160 | return ret ^= pdata->status_gpio_active_low == 0; | |
161 | } else { | |
162 | int ac = 0; | |
163 | ||
164 | ac = bq24735_read_word(charger->client, BQ24735_CHG_OPT); | |
165 | if (ac < 0) { | |
166 | dev_err(&charger->client->dev, | |
167 | "Failed to read charger options : %d\n", | |
168 | ac); | |
169 | return false; | |
170 | } | |
171 | return (ac & BQ24735_CHG_OPT_AC_PRESENT) ? true : false; | |
172 | } | |
173 | ||
174 | return false; | |
175 | } | |
176 | ||
177 | static irqreturn_t bq24735_charger_isr(int irq, void *devid) | |
178 | { | |
179 | struct power_supply *psy = devid; | |
180 | struct bq24735 *charger = to_bq24735(psy); | |
181 | ||
182 | if (bq24735_charger_is_present(charger)) | |
183 | bq24735_enable_charging(charger); | |
184 | else | |
185 | bq24735_disable_charging(charger); | |
186 | ||
187 | power_supply_changed(psy); | |
188 | ||
189 | return IRQ_HANDLED; | |
190 | } | |
191 | ||
192 | static int bq24735_charger_get_property(struct power_supply *psy, | |
193 | enum power_supply_property psp, | |
194 | union power_supply_propval *val) | |
195 | { | |
297d716f | 196 | struct bq24735 *charger = to_bq24735(psy); |
ce773992 DS |
197 | |
198 | switch (psp) { | |
199 | case POWER_SUPPLY_PROP_ONLINE: | |
200 | val->intval = bq24735_charger_is_present(charger) ? 1 : 0; | |
201 | break; | |
202 | default: | |
203 | return -EINVAL; | |
204 | } | |
205 | ||
206 | return 0; | |
207 | } | |
208 | ||
209 | static struct bq24735_platform *bq24735_parse_dt_data(struct i2c_client *client) | |
210 | { | |
211 | struct bq24735_platform *pdata; | |
212 | struct device_node *np = client->dev.of_node; | |
213 | u32 val; | |
214 | int ret; | |
215 | enum of_gpio_flags flags; | |
216 | ||
217 | pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL); | |
218 | if (!pdata) { | |
219 | dev_err(&client->dev, | |
220 | "Memory alloc for bq24735 pdata failed\n"); | |
221 | return NULL; | |
222 | } | |
223 | ||
224 | pdata->status_gpio = of_get_named_gpio_flags(np, "ti,ac-detect-gpios", | |
225 | 0, &flags); | |
226 | ||
227 | if (flags & OF_GPIO_ACTIVE_LOW) | |
228 | pdata->status_gpio_active_low = 1; | |
229 | ||
230 | ret = of_property_read_u32(np, "ti,charge-current", &val); | |
231 | if (!ret) | |
232 | pdata->charge_current = val; | |
233 | ||
234 | ret = of_property_read_u32(np, "ti,charge-voltage", &val); | |
235 | if (!ret) | |
236 | pdata->charge_voltage = val; | |
237 | ||
238 | ret = of_property_read_u32(np, "ti,input-current", &val); | |
239 | if (!ret) | |
240 | pdata->input_current = val; | |
241 | ||
242 | return pdata; | |
243 | } | |
244 | ||
245 | static int bq24735_charger_probe(struct i2c_client *client, | |
246 | const struct i2c_device_id *id) | |
247 | { | |
248 | int ret; | |
249 | struct bq24735 *charger; | |
297d716f | 250 | struct power_supply_desc *supply_desc; |
2dc9215d | 251 | struct power_supply_config psy_cfg = {}; |
ce773992 DS |
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) { | |
71a5a508 VT |
270 | name = devm_kasprintf(&client->dev, GFP_KERNEL, |
271 | "bq24735@%s", | |
272 | dev_name(&client->dev)); | |
ce773992 DS |
273 | if (!name) { |
274 | dev_err(&client->dev, "Failed to alloc device name\n"); | |
275 | return -ENOMEM; | |
276 | } | |
277 | } | |
278 | ||
279 | charger->client = client; | |
280 | ||
297d716f | 281 | supply_desc = &charger->charger_desc; |
ce773992 | 282 | |
297d716f KK |
283 | supply_desc->name = name; |
284 | supply_desc->type = POWER_SUPPLY_TYPE_MAINS; | |
285 | supply_desc->properties = bq24735_charger_properties; | |
286 | supply_desc->num_properties = ARRAY_SIZE(bq24735_charger_properties); | |
287 | supply_desc->get_property = bq24735_charger_get_property; | |
2dc9215d KK |
288 | |
289 | psy_cfg.supplied_to = charger->pdata->supplied_to; | |
290 | psy_cfg.num_supplicants = charger->pdata->num_supplicants; | |
291 | psy_cfg.of_node = client->dev.of_node; | |
297d716f | 292 | psy_cfg.drv_data = charger; |
ce773992 DS |
293 | |
294 | i2c_set_clientdata(client, charger); | |
295 | ||
296 | ret = bq24735_read_word(client, BQ24735_MANUFACTURER_ID); | |
297 | if (ret < 0) { | |
298 | dev_err(&client->dev, "Failed to read manufacturer id : %d\n", | |
299 | ret); | |
71a5a508 | 300 | return ret; |
ce773992 DS |
301 | } else if (ret != 0x0040) { |
302 | dev_err(&client->dev, | |
303 | "manufacturer id mismatch. 0x0040 != 0x%04x\n", ret); | |
71a5a508 | 304 | return -ENODEV; |
ce773992 DS |
305 | } |
306 | ||
307 | ret = bq24735_read_word(client, BQ24735_DEVICE_ID); | |
308 | if (ret < 0) { | |
309 | dev_err(&client->dev, "Failed to read device id : %d\n", ret); | |
71a5a508 | 310 | return ret; |
ce773992 DS |
311 | } else if (ret != 0x000B) { |
312 | dev_err(&client->dev, | |
313 | "device id mismatch. 0x000b != 0x%04x\n", ret); | |
71a5a508 | 314 | return -ENODEV; |
ce773992 DS |
315 | } |
316 | ||
317 | if (gpio_is_valid(charger->pdata->status_gpio)) { | |
318 | ret = devm_gpio_request(&client->dev, | |
319 | charger->pdata->status_gpio, | |
320 | name); | |
321 | if (ret) { | |
322 | dev_err(&client->dev, | |
323 | "Failed GPIO request for GPIO %d: %d\n", | |
324 | charger->pdata->status_gpio, ret); | |
325 | } | |
326 | ||
327 | charger->pdata->status_gpio_valid = !ret; | |
328 | } | |
329 | ||
330 | ret = bq24735_config_charger(charger); | |
331 | if (ret < 0) { | |
332 | dev_err(&client->dev, "failed in configuring charger"); | |
71a5a508 | 333 | return ret; |
ce773992 DS |
334 | } |
335 | ||
336 | /* check for AC adapter presence */ | |
337 | if (bq24735_charger_is_present(charger)) { | |
338 | ret = bq24735_enable_charging(charger); | |
339 | if (ret < 0) { | |
340 | dev_err(&client->dev, "Failed to enable charging\n"); | |
71a5a508 | 341 | return ret; |
ce773992 DS |
342 | } |
343 | } | |
344 | ||
71a5a508 VT |
345 | charger->charger = devm_power_supply_register(&client->dev, supply_desc, |
346 | &psy_cfg); | |
297d716f KK |
347 | if (IS_ERR(charger->charger)) { |
348 | ret = PTR_ERR(charger->charger); | |
ce773992 DS |
349 | dev_err(&client->dev, "Failed to register power supply: %d\n", |
350 | ret); | |
71a5a508 | 351 | return ret; |
ce773992 DS |
352 | } |
353 | ||
354 | if (client->irq) { | |
355 | ret = devm_request_threaded_irq(&client->dev, client->irq, | |
356 | NULL, bq24735_charger_isr, | |
357 | IRQF_TRIGGER_RISING | | |
358 | IRQF_TRIGGER_FALLING | | |
359 | IRQF_ONESHOT, | |
297d716f KK |
360 | supply_desc->name, |
361 | charger->charger); | |
ce773992 DS |
362 | if (ret) { |
363 | dev_err(&client->dev, | |
364 | "Unable to register IRQ %d err %d\n", | |
365 | client->irq, ret); | |
71a5a508 | 366 | return ret; |
ce773992 DS |
367 | } |
368 | } | |
369 | ||
ce773992 DS |
370 | return 0; |
371 | } | |
372 | ||
373 | static const struct i2c_device_id bq24735_charger_id[] = { | |
374 | { "bq24735-charger", 0 }, | |
375 | {} | |
376 | }; | |
377 | MODULE_DEVICE_TABLE(i2c, bq24735_charger_id); | |
378 | ||
379 | static const struct of_device_id bq24735_match_ids[] = { | |
380 | { .compatible = "ti,bq24735", }, | |
381 | { /* end */ } | |
382 | }; | |
383 | MODULE_DEVICE_TABLE(of, bq24735_match_ids); | |
384 | ||
385 | static struct i2c_driver bq24735_charger_driver = { | |
386 | .driver = { | |
387 | .name = "bq24735-charger", | |
ce773992 DS |
388 | .of_match_table = bq24735_match_ids, |
389 | }, | |
390 | .probe = bq24735_charger_probe, | |
ce773992 DS |
391 | .id_table = bq24735_charger_id, |
392 | }; | |
393 | ||
394 | module_i2c_driver(bq24735_charger_driver); | |
395 | ||
396 | MODULE_DESCRIPTION("bq24735 battery charging driver"); | |
397 | MODULE_AUTHOR("Darbha Sriharsha <dsriharsha@nvidia.com>"); | |
398 | MODULE_LICENSE("GPL v2"); |