1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (C) 2018 Spreadtrum Communications Inc.
4 #include <linux/module.h>
5 #include <linux/platform_device.h>
6 #include <linux/power_supply.h>
7 #include <linux/usb/phy.h>
8 #include <linux/regmap.h>
9 #include <linux/notifier.h>
12 /* PMIC global registers definition */
13 #define SC2731_CHARGE_STATUS 0xedc
14 #define SC2731_CHARGE_FULL BIT(4)
15 #define SC2731_MODULE_EN1 0xc0c
16 #define SC2731_CHARGE_EN BIT(5)
18 /* SC2731 switch charger registers definition */
19 #define SC2731_CHG_CFG0 0x0
20 #define SC2731_CHG_CFG1 0x4
21 #define SC2731_CHG_CFG2 0x8
22 #define SC2731_CHG_CFG3 0xc
23 #define SC2731_CHG_CFG4 0x10
24 #define SC2731_CHG_CFG5 0x28
26 /* SC2731_CHG_CFG0 register definition */
27 #define SC2731_PRECHG_RNG_SHIFT 11
28 #define SC2731_PRECHG_RNG_MASK GENMASK(12, 11)
30 #define SC2731_TERMINATION_VOL_MASK GENMASK(2, 1)
31 #define SC2731_TERMINATION_VOL_SHIFT 1
32 #define SC2731_TERMINATION_VOL_CAL_MASK GENMASK(8, 3)
33 #define SC2731_TERMINATION_VOL_CAL_SHIFT 3
34 #define SC2731_TERMINATION_CUR_MASK GENMASK(2, 0)
36 #define SC2731_CC_EN BIT(13)
37 #define SC2731_CHARGER_PD BIT(0)
39 /* SC2731_CHG_CFG1 register definition */
40 #define SC2731_CUR_MASK GENMASK(5, 0)
42 /* SC2731_CHG_CFG5 register definition */
43 #define SC2731_CUR_LIMIT_SHIFT 8
44 #define SC2731_CUR_LIMIT_MASK GENMASK(9, 8)
46 /* Default current definition (unit is mA) */
47 #define SC2731_CURRENT_LIMIT_100 100
48 #define SC2731_CURRENT_LIMIT_500 500
49 #define SC2731_CURRENT_LIMIT_900 900
50 #define SC2731_CURRENT_LIMIT_2000 2000
51 #define SC2731_CURRENT_PRECHG 450
52 #define SC2731_CURRENT_STEP 50
54 struct sc2731_charger_info {
56 struct regmap *regmap;
57 struct usb_phy *usb_phy;
58 struct notifier_block usb_notify;
59 struct power_supply *psy_usb;
65 static void sc2731_charger_stop_charge(struct sc2731_charger_info *info)
67 regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0,
70 regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0,
71 SC2731_CHARGER_PD, SC2731_CHARGER_PD);
74 static int sc2731_charger_start_charge(struct sc2731_charger_info *info)
78 /* Enable charger constant current mode */
79 ret = regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0,
80 SC2731_CC_EN, SC2731_CC_EN);
85 return regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0,
86 SC2731_CHARGER_PD, 0);
89 static int sc2731_charger_set_current_limit(struct sc2731_charger_info *info,
94 if (limit <= SC2731_CURRENT_LIMIT_100)
96 else if (limit <= SC2731_CURRENT_LIMIT_500)
98 else if (limit <= SC2731_CURRENT_LIMIT_900)
103 return regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG5,
104 SC2731_CUR_LIMIT_MASK,
105 val << SC2731_CUR_LIMIT_SHIFT);
108 static int sc2731_charger_set_current(struct sc2731_charger_info *info, u32 cur)
113 if (cur > SC2731_CURRENT_LIMIT_2000)
114 cur = SC2731_CURRENT_LIMIT_2000;
115 else if (cur < SC2731_CURRENT_PRECHG)
116 cur = SC2731_CURRENT_PRECHG;
118 /* Calculate the step value, each step is 50 mA */
119 val = (cur - SC2731_CURRENT_PRECHG) / SC2731_CURRENT_STEP;
121 /* Set pre-charge current as 450 mA */
122 ret = regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0,
123 SC2731_PRECHG_RNG_MASK,
124 0x3 << SC2731_PRECHG_RNG_SHIFT);
128 return regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG1,
129 SC2731_CUR_MASK, val);
132 static int sc2731_charger_get_status(struct sc2731_charger_info *info)
137 ret = regmap_read(info->regmap, SC2731_CHARGE_STATUS, &val);
141 if (val & SC2731_CHARGE_FULL)
142 return POWER_SUPPLY_STATUS_FULL;
144 return POWER_SUPPLY_STATUS_CHARGING;
147 static int sc2731_charger_get_current(struct sc2731_charger_info *info,
153 ret = regmap_read(info->regmap, info->base + SC2731_CHG_CFG1, &val);
157 val &= SC2731_CUR_MASK;
158 *cur = val * SC2731_CURRENT_STEP + SC2731_CURRENT_PRECHG;
163 static int sc2731_charger_get_current_limit(struct sc2731_charger_info *info,
169 ret = regmap_read(info->regmap, info->base + SC2731_CHG_CFG5, &val);
173 val = (val & SC2731_CUR_LIMIT_MASK) >> SC2731_CUR_LIMIT_SHIFT;
177 *cur = SC2731_CURRENT_LIMIT_100;
181 *cur = SC2731_CURRENT_LIMIT_2000;
185 *cur = SC2731_CURRENT_LIMIT_900;
189 *cur = SC2731_CURRENT_LIMIT_500;
200 sc2731_charger_usb_set_property(struct power_supply *psy,
201 enum power_supply_property psp,
202 const union power_supply_propval *val)
204 struct sc2731_charger_info *info = power_supply_get_drvdata(psy);
207 mutex_lock(&info->lock);
209 if (!info->charging) {
210 mutex_unlock(&info->lock);
215 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
216 ret = sc2731_charger_set_current(info, val->intval / 1000);
218 dev_err(info->dev, "set charge current failed\n");
221 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
222 ret = sc2731_charger_set_current_limit(info,
225 dev_err(info->dev, "set input current limit failed\n");
232 mutex_unlock(&info->lock);
236 static int sc2731_charger_usb_get_property(struct power_supply *psy,
237 enum power_supply_property psp,
238 union power_supply_propval *val)
240 struct sc2731_charger_info *info = power_supply_get_drvdata(psy);
244 mutex_lock(&info->lock);
247 case POWER_SUPPLY_PROP_STATUS:
249 val->intval = sc2731_charger_get_status(info);
251 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
254 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
255 if (!info->charging) {
258 ret = sc2731_charger_get_current(info, &cur);
262 val->intval = cur * 1000;
266 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
267 if (!info->charging) {
270 ret = sc2731_charger_get_current_limit(info, &cur);
274 val->intval = cur * 1000;
283 mutex_unlock(&info->lock);
287 static int sc2731_charger_property_is_writeable(struct power_supply *psy,
288 enum power_supply_property psp)
293 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
294 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
305 static enum power_supply_property sc2731_usb_props[] = {
306 POWER_SUPPLY_PROP_STATUS,
307 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
308 POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
311 static const struct power_supply_desc sc2731_charger_desc = {
312 .name = "sc2731_charger",
313 .type = POWER_SUPPLY_TYPE_USB,
314 .properties = sc2731_usb_props,
315 .num_properties = ARRAY_SIZE(sc2731_usb_props),
316 .get_property = sc2731_charger_usb_get_property,
317 .set_property = sc2731_charger_usb_set_property,
318 .property_is_writeable = sc2731_charger_property_is_writeable,
321 static int sc2731_charger_usb_change(struct notifier_block *nb,
322 unsigned long limit, void *data)
324 struct sc2731_charger_info *info =
325 container_of(nb, struct sc2731_charger_info, usb_notify);
328 mutex_lock(&info->lock);
331 /* set current limitation and start to charge */
332 ret = sc2731_charger_set_current_limit(info, limit);
336 ret = sc2731_charger_set_current(info, limit);
340 ret = sc2731_charger_start_charge(info);
344 info->charging = true;
347 info->charging = false;
348 sc2731_charger_stop_charge(info);
352 mutex_unlock(&info->lock);
356 static int sc2731_charger_hw_init(struct sc2731_charger_info *info)
358 struct power_supply_battery_info bat_info = { };
359 u32 term_currrent, term_voltage, cur_val, vol_val;
362 /* Enable charger module */
363 ret = regmap_update_bits(info->regmap, SC2731_MODULE_EN1,
364 SC2731_CHARGE_EN, SC2731_CHARGE_EN);
368 ret = power_supply_get_battery_info(info->psy_usb, &bat_info);
370 dev_warn(info->dev, "no battery information is supplied\n");
373 * If no battery information is supplied, we should set
374 * default charge termination current to 120 mA, and default
375 * charge termination voltage to 4.35V.
380 term_currrent = bat_info.charge_term_current_ua / 1000;
382 if (term_currrent <= 90)
384 else if (term_currrent >= 265)
387 cur_val = ((term_currrent - 90) / 25) + 1;
389 term_voltage = bat_info.constant_charge_voltage_max_uv / 1000;
391 if (term_voltage > 4500)
394 if (term_voltage > 4200)
395 vol_val = (term_voltage - 4200) / 100;
400 /* Set charge termination current */
401 ret = regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG2,
402 SC2731_TERMINATION_CUR_MASK, cur_val);
406 /* Set charge termination voltage */
407 ret = regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0,
408 SC2731_TERMINATION_VOL_MASK |
409 SC2731_TERMINATION_VOL_CAL_MASK,
410 (vol_val << SC2731_TERMINATION_VOL_SHIFT) |
411 (0x6 << SC2731_TERMINATION_VOL_CAL_SHIFT));
418 regmap_update_bits(info->regmap, SC2731_MODULE_EN1, SC2731_CHARGE_EN, 0);
422 static int sc2731_charger_probe(struct platform_device *pdev)
424 struct device_node *np = pdev->dev.of_node;
425 struct sc2731_charger_info *info;
426 struct power_supply_config charger_cfg = { };
429 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
433 mutex_init(&info->lock);
434 info->dev = &pdev->dev;
436 info->regmap = dev_get_regmap(pdev->dev.parent, NULL);
438 dev_err(&pdev->dev, "failed to get charger regmap\n");
442 ret = of_property_read_u32(np, "reg", &info->base);
444 dev_err(&pdev->dev, "failed to get register address\n");
448 charger_cfg.drv_data = info;
449 charger_cfg.of_node = np;
450 info->psy_usb = devm_power_supply_register(&pdev->dev,
451 &sc2731_charger_desc,
453 if (IS_ERR(info->psy_usb)) {
454 dev_err(&pdev->dev, "failed to register power supply\n");
455 return PTR_ERR(info->psy_usb);
458 ret = sc2731_charger_hw_init(info);
462 info->usb_phy = devm_usb_get_phy_by_phandle(&pdev->dev, "phys", 0);
463 if (IS_ERR(info->usb_phy)) {
464 dev_err(&pdev->dev, "failed to find USB phy\n");
465 return PTR_ERR(info->usb_phy);
468 info->usb_notify.notifier_call = sc2731_charger_usb_change;
469 ret = usb_register_notifier(info->usb_phy, &info->usb_notify);
471 dev_err(&pdev->dev, "failed to register notifier: %d\n", ret);
478 static int sc2731_charger_remove(struct platform_device *pdev)
480 struct sc2731_charger_info *info = platform_get_drvdata(pdev);
482 usb_unregister_notifier(info->usb_phy, &info->usb_notify);
487 static const struct of_device_id sc2731_charger_of_match[] = {
488 { .compatible = "sprd,sc2731-charger", },
492 static struct platform_driver sc2731_charger_driver = {
494 .name = "sc2731-charger",
495 .of_match_table = sc2731_charger_of_match,
497 .probe = sc2731_charger_probe,
498 .remove = sc2731_charger_remove,
501 module_platform_driver(sc2731_charger_driver);
503 MODULE_DESCRIPTION("Spreadtrum SC2731 Charger Driver");
504 MODULE_LICENSE("GPL v2");