2 * Battery charger driver for TI BQ24735
4 * Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved.
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;
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
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.
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>
28 #include <linux/gpio/consumer.h>
29 #include <linux/power_supply.h>
30 #include <linux/slab.h>
32 #include <linux/power/bq24735-charger.h>
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
47 struct power_supply *charger;
48 struct power_supply_desc charger_desc;
49 struct i2c_client *client;
50 struct bq24735_platform *pdata;
52 struct gpio_desc *status_gpio;
53 struct delayed_work poll;
58 static inline struct bq24735 *to_bq24735(struct power_supply *psy)
60 return power_supply_get_drvdata(psy);
63 static enum power_supply_property bq24735_charger_properties[] = {
64 POWER_SUPPLY_PROP_STATUS,
65 POWER_SUPPLY_PROP_ONLINE,
68 static int bq24735_charger_property_is_writeable(struct power_supply *psy,
69 enum power_supply_property psp)
72 case POWER_SUPPLY_PROP_STATUS:
81 static inline int bq24735_write_word(struct i2c_client *client, u8 reg,
84 return i2c_smbus_write_word_data(client, reg, value);
87 static inline int bq24735_read_word(struct i2c_client *client, u8 reg)
89 return i2c_smbus_read_word_data(client, reg);
92 static int bq24735_update_word(struct i2c_client *client, u8 reg,
98 ret = bq24735_read_word(client, reg);
105 return bq24735_write_word(client, reg, tmp);
108 static int bq24735_config_charger(struct bq24735 *charger)
110 struct bq24735_platform *pdata = charger->pdata;
114 if (pdata->ext_control)
117 if (pdata->charge_current) {
118 value = pdata->charge_current & BQ24735_CHARGE_CURRENT_MASK;
120 ret = bq24735_write_word(charger->client,
121 BQ24735_CHARGE_CURRENT, value);
123 dev_err(&charger->client->dev,
124 "Failed to write charger current : %d\n",
130 if (pdata->charge_voltage) {
131 value = pdata->charge_voltage & BQ24735_CHARGE_VOLTAGE_MASK;
133 ret = bq24735_write_word(charger->client,
134 BQ24735_CHARGE_VOLTAGE, value);
136 dev_err(&charger->client->dev,
137 "Failed to write charger voltage : %d\n",
143 if (pdata->input_current) {
144 value = pdata->input_current & BQ24735_INPUT_CURRENT_MASK;
146 ret = bq24735_write_word(charger->client,
147 BQ24735_INPUT_CURRENT, value);
149 dev_err(&charger->client->dev,
150 "Failed to write input current : %d\n",
159 static inline int bq24735_enable_charging(struct bq24735 *charger)
163 if (charger->pdata->ext_control)
166 ret = bq24735_config_charger(charger);
170 return bq24735_update_word(charger->client, BQ24735_CHG_OPT,
171 BQ24735_CHG_OPT_CHARGE_DISABLE, 0);
174 static inline int bq24735_disable_charging(struct bq24735 *charger)
176 if (charger->pdata->ext_control)
179 return bq24735_update_word(charger->client, BQ24735_CHG_OPT,
180 BQ24735_CHG_OPT_CHARGE_DISABLE,
181 BQ24735_CHG_OPT_CHARGE_DISABLE);
184 static bool bq24735_charger_is_present(struct bq24735 *charger)
186 if (charger->status_gpio) {
187 return !gpiod_get_value_cansleep(charger->status_gpio);
191 ac = bq24735_read_word(charger->client, BQ24735_CHG_OPT);
193 dev_dbg(&charger->client->dev,
194 "Failed to read charger options : %d\n",
198 return (ac & BQ24735_CHG_OPT_AC_PRESENT) ? true : false;
204 static int bq24735_charger_is_charging(struct bq24735 *charger)
208 if (!bq24735_charger_is_present(charger))
211 ret = bq24735_read_word(charger->client, BQ24735_CHG_OPT);
215 return !(ret & BQ24735_CHG_OPT_CHARGE_DISABLE);
218 static void bq24735_update(struct bq24735 *charger)
220 mutex_lock(&charger->lock);
222 if (charger->charging && bq24735_charger_is_present(charger))
223 bq24735_enable_charging(charger);
225 bq24735_disable_charging(charger);
227 mutex_unlock(&charger->lock);
229 power_supply_changed(charger->charger);
232 static irqreturn_t bq24735_charger_isr(int irq, void *devid)
234 struct power_supply *psy = devid;
235 struct bq24735 *charger = to_bq24735(psy);
237 bq24735_update(charger);
242 static void bq24735_poll(struct work_struct *work)
244 struct bq24735 *charger = container_of(work, struct bq24735, poll.work);
246 bq24735_update(charger);
248 schedule_delayed_work(&charger->poll,
249 msecs_to_jiffies(charger->poll_interval));
252 static int bq24735_charger_get_property(struct power_supply *psy,
253 enum power_supply_property psp,
254 union power_supply_propval *val)
256 struct bq24735 *charger = to_bq24735(psy);
259 case POWER_SUPPLY_PROP_ONLINE:
260 val->intval = bq24735_charger_is_present(charger) ? 1 : 0;
262 case POWER_SUPPLY_PROP_STATUS:
263 switch (bq24735_charger_is_charging(charger)) {
265 val->intval = POWER_SUPPLY_STATUS_CHARGING;
268 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
271 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
282 static int bq24735_charger_set_property(struct power_supply *psy,
283 enum power_supply_property psp,
284 const union power_supply_propval *val)
286 struct bq24735 *charger = to_bq24735(psy);
290 case POWER_SUPPLY_PROP_STATUS:
291 switch (val->intval) {
292 case POWER_SUPPLY_STATUS_CHARGING:
293 mutex_lock(&charger->lock);
294 charger->charging = true;
295 ret = bq24735_enable_charging(charger);
296 mutex_unlock(&charger->lock);
300 case POWER_SUPPLY_STATUS_DISCHARGING:
301 case POWER_SUPPLY_STATUS_NOT_CHARGING:
302 mutex_lock(&charger->lock);
303 charger->charging = false;
304 ret = bq24735_disable_charging(charger);
305 mutex_unlock(&charger->lock);
312 power_supply_changed(psy);
321 static struct bq24735_platform *bq24735_parse_dt_data(struct i2c_client *client)
323 struct bq24735_platform *pdata;
324 struct device_node *np = client->dev.of_node;
328 pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
330 dev_err(&client->dev,
331 "Memory alloc for bq24735 pdata failed\n");
335 ret = of_property_read_u32(np, "ti,charge-current", &val);
337 pdata->charge_current = val;
339 ret = of_property_read_u32(np, "ti,charge-voltage", &val);
341 pdata->charge_voltage = val;
343 ret = of_property_read_u32(np, "ti,input-current", &val);
345 pdata->input_current = val;
347 pdata->ext_control = of_property_read_bool(np, "ti,external-control");
352 static int bq24735_charger_probe(struct i2c_client *client,
353 const struct i2c_device_id *id)
356 struct bq24735 *charger;
357 struct power_supply_desc *supply_desc;
358 struct power_supply_config psy_cfg = {};
361 charger = devm_kzalloc(&client->dev, sizeof(*charger), GFP_KERNEL);
365 mutex_init(&charger->lock);
366 charger->charging = true;
367 charger->pdata = client->dev.platform_data;
369 if (IS_ENABLED(CONFIG_OF) && !charger->pdata && client->dev.of_node)
370 charger->pdata = bq24735_parse_dt_data(client);
372 if (!charger->pdata) {
373 dev_err(&client->dev, "no platform data provided\n");
377 name = (char *)charger->pdata->name;
379 name = devm_kasprintf(&client->dev, GFP_KERNEL,
381 dev_name(&client->dev));
383 dev_err(&client->dev, "Failed to alloc device name\n");
388 charger->client = client;
390 supply_desc = &charger->charger_desc;
392 supply_desc->name = name;
393 supply_desc->type = POWER_SUPPLY_TYPE_MAINS;
394 supply_desc->properties = bq24735_charger_properties;
395 supply_desc->num_properties = ARRAY_SIZE(bq24735_charger_properties);
396 supply_desc->get_property = bq24735_charger_get_property;
397 supply_desc->set_property = bq24735_charger_set_property;
398 supply_desc->property_is_writeable =
399 bq24735_charger_property_is_writeable;
401 psy_cfg.supplied_to = charger->pdata->supplied_to;
402 psy_cfg.num_supplicants = charger->pdata->num_supplicants;
403 psy_cfg.of_node = client->dev.of_node;
404 psy_cfg.drv_data = charger;
406 i2c_set_clientdata(client, charger);
408 charger->status_gpio = devm_gpiod_get_optional(&client->dev,
411 if (IS_ERR(charger->status_gpio)) {
412 ret = PTR_ERR(charger->status_gpio);
413 dev_err(&client->dev, "Getting gpio failed: %d\n", ret);
417 if (bq24735_charger_is_present(charger)) {
418 ret = bq24735_read_word(client, BQ24735_MANUFACTURER_ID);
420 dev_err(&client->dev, "Failed to read manufacturer id : %d\n",
423 } else if (ret != 0x0040) {
424 dev_err(&client->dev,
425 "manufacturer id mismatch. 0x0040 != 0x%04x\n", ret);
429 ret = bq24735_read_word(client, BQ24735_DEVICE_ID);
431 dev_err(&client->dev, "Failed to read device id : %d\n", ret);
433 } else if (ret != 0x000B) {
434 dev_err(&client->dev,
435 "device id mismatch. 0x000b != 0x%04x\n", ret);
439 ret = bq24735_enable_charging(charger);
441 dev_err(&client->dev, "Failed to enable charging\n");
446 charger->charger = devm_power_supply_register(&client->dev, supply_desc,
448 if (IS_ERR(charger->charger)) {
449 ret = PTR_ERR(charger->charger);
450 dev_err(&client->dev, "Failed to register power supply: %d\n",
456 ret = devm_request_threaded_irq(&client->dev, client->irq,
457 NULL, bq24735_charger_isr,
458 IRQF_TRIGGER_RISING |
459 IRQF_TRIGGER_FALLING |
464 dev_err(&client->dev,
465 "Unable to register IRQ %d err %d\n",
470 ret = device_property_read_u32(&client->dev, "poll-interval",
471 &charger->poll_interval);
474 if (!charger->poll_interval)
477 INIT_DELAYED_WORK(&charger->poll, bq24735_poll);
478 schedule_delayed_work(&charger->poll,
479 msecs_to_jiffies(charger->poll_interval));
485 static int bq24735_charger_remove(struct i2c_client *client)
487 struct bq24735 *charger = i2c_get_clientdata(client);
489 if (charger->poll_interval)
490 cancel_delayed_work_sync(&charger->poll);
495 static const struct i2c_device_id bq24735_charger_id[] = {
496 { "bq24735-charger", 0 },
499 MODULE_DEVICE_TABLE(i2c, bq24735_charger_id);
501 static const struct of_device_id bq24735_match_ids[] = {
502 { .compatible = "ti,bq24735", },
505 MODULE_DEVICE_TABLE(of, bq24735_match_ids);
507 static struct i2c_driver bq24735_charger_driver = {
509 .name = "bq24735-charger",
510 .of_match_table = bq24735_match_ids,
512 .probe = bq24735_charger_probe,
513 .remove = bq24735_charger_remove,
514 .id_table = bq24735_charger_id,
517 module_i2c_driver(bq24735_charger_driver);
519 MODULE_DESCRIPTION("bq24735 battery charging driver");
520 MODULE_AUTHOR("Darbha Sriharsha <dsriharsha@nvidia.com>");
521 MODULE_LICENSE("GPL v2");