1 // SPDX-License-Identifier: GPL-2.0+
3 // max8997_charger.c - Power supply consumer driver for the Maxim 8997/8966
5 // Copyright (C) 2011 Samsung Electronics
6 // MyungJoo Ham <myungjoo.ham@samsung.com>
9 #include <linux/extcon.h>
10 #include <linux/module.h>
11 #include <linux/slab.h>
12 #include <linux/platform_device.h>
13 #include <linux/power_supply.h>
14 #include <linux/mfd/max8997.h>
15 #include <linux/mfd/max8997-private.h>
16 #include <linux/regulator/consumer.h>
17 #include <linux/devm-helpers.h>
19 /* MAX8997_REG_STATUS4 */
20 #define DCINOK_SHIFT 1
21 #define DCINOK_MASK (1 << DCINOK_SHIFT)
22 #define DETBAT_SHIFT 2
23 #define DETBAT_MASK (1 << DETBAT_SHIFT)
25 /* MAX8997_REG_MBCCTRL1 */
27 #define TFCH_MASK (7 << TFCH_SHIFT)
29 /* MAX8997_REG_MBCCTRL5 */
30 #define ITOPOFF_SHIFT 0
31 #define ITOPOFF_MASK (0xF << ITOPOFF_SHIFT)
35 struct max8997_dev *iodev;
36 struct power_supply *battery;
37 struct regulator *reg;
38 struct extcon_dev *edev;
39 struct notifier_block extcon_nb;
40 struct work_struct extcon_work;
43 static enum power_supply_property max8997_battery_props[] = {
44 POWER_SUPPLY_PROP_STATUS, /* "FULL", "CHARGING" or "DISCHARGING". */
45 POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */
46 POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */
49 /* Note that the charger control is done by a current regulator "CHARGER" */
50 static int max8997_battery_get_property(struct power_supply *psy,
51 enum power_supply_property psp,
52 union power_supply_propval *val)
54 struct charger_data *charger = power_supply_get_drvdata(psy);
55 struct i2c_client *i2c = charger->iodev->i2c;
60 case POWER_SUPPLY_PROP_STATUS:
62 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
65 if ((reg & (1 << 0)) == 0x1)
66 val->intval = POWER_SUPPLY_STATUS_FULL;
67 else if ((reg & DCINOK_MASK))
68 val->intval = POWER_SUPPLY_STATUS_CHARGING;
70 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
73 case POWER_SUPPLY_PROP_PRESENT:
75 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
78 if ((reg & DETBAT_MASK) == 0x0)
82 case POWER_SUPPLY_PROP_ONLINE:
84 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
87 if (reg & DCINOK_MASK)
98 static void max8997_battery_extcon_evt_worker(struct work_struct *work)
100 struct charger_data *charger =
101 container_of(work, struct charger_data, extcon_work);
102 struct extcon_dev *edev = charger->edev;
105 if (extcon_get_state(edev, EXTCON_CHG_USB_SDP) > 0) {
106 dev_dbg(charger->dev, "USB SDP charger is connected\n");
107 current_limit = 450000;
108 } else if (extcon_get_state(edev, EXTCON_CHG_USB_DCP) > 0) {
109 dev_dbg(charger->dev, "USB DCP charger is connected\n");
110 current_limit = 650000;
111 } else if (extcon_get_state(edev, EXTCON_CHG_USB_FAST) > 0) {
112 dev_dbg(charger->dev, "USB FAST charger is connected\n");
113 current_limit = 650000;
114 } else if (extcon_get_state(edev, EXTCON_CHG_USB_SLOW) > 0) {
115 dev_dbg(charger->dev, "USB SLOW charger is connected\n");
116 current_limit = 650000;
117 } else if (extcon_get_state(edev, EXTCON_CHG_USB_CDP) > 0) {
118 dev_dbg(charger->dev, "USB CDP charger is connected\n");
119 current_limit = 650000;
121 dev_dbg(charger->dev, "USB charger is disconnected\n");
125 if (current_limit > 0) {
126 int ret = regulator_set_current_limit(charger->reg, current_limit, current_limit);
129 dev_err(charger->dev, "failed to set current limit: %d\n", ret);
132 ret = regulator_enable(charger->reg);
134 dev_err(charger->dev, "failed to enable regulator: %d\n", ret);
136 int ret = regulator_disable(charger->reg);
139 dev_err(charger->dev, "failed to disable regulator: %d\n", ret);
143 static int max8997_battery_extcon_evt(struct notifier_block *nb,
144 unsigned long event, void *param)
146 struct charger_data *charger =
147 container_of(nb, struct charger_data, extcon_nb);
148 schedule_work(&charger->extcon_work);
152 static const struct power_supply_desc max8997_battery_desc = {
153 .name = "max8997_pmic",
154 .type = POWER_SUPPLY_TYPE_BATTERY,
155 .get_property = max8997_battery_get_property,
156 .properties = max8997_battery_props,
157 .num_properties = ARRAY_SIZE(max8997_battery_props),
160 static int max8997_battery_probe(struct platform_device *pdev)
163 struct charger_data *charger;
164 struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
165 struct device_node *np = pdev->dev.of_node;
166 struct i2c_client *i2c = iodev->i2c;
167 struct max8997_platform_data *pdata = iodev->pdata;
168 struct power_supply_config psy_cfg = {};
171 dev_err(&pdev->dev, "No platform data supplied.\n");
176 int val = (pdata->eoc_mA - 50) / 10;
182 ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL5,
183 val << ITOPOFF_SHIFT, ITOPOFF_MASK);
185 dev_err(&pdev->dev, "Cannot use i2c bus.\n");
189 switch (pdata->timeout) {
191 ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1,
192 0x2 << TFCH_SHIFT, TFCH_MASK);
195 ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1,
196 0x3 << TFCH_SHIFT, TFCH_MASK);
199 ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1,
200 0x4 << TFCH_SHIFT, TFCH_MASK);
203 ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1,
204 0x7 << TFCH_SHIFT, TFCH_MASK);
207 dev_err(&pdev->dev, "incorrect timeout value (%d)\n",
212 dev_err(&pdev->dev, "Cannot use i2c bus.\n");
216 charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
220 platform_set_drvdata(pdev, charger);
222 charger->dev = &pdev->dev;
223 charger->iodev = iodev;
225 psy_cfg.drv_data = charger;
227 charger->battery = devm_power_supply_register(&pdev->dev,
228 &max8997_battery_desc,
230 if (IS_ERR(charger->battery)) {
231 dev_err(&pdev->dev, "failed: power supply register\n");
232 return PTR_ERR(charger->battery);
235 // grab regulator from parent device's node
236 pdev->dev.of_node = iodev->dev->of_node;
237 charger->reg = devm_regulator_get_optional(&pdev->dev, "charger");
238 pdev->dev.of_node = np;
239 if (IS_ERR(charger->reg)) {
240 if (PTR_ERR(charger->reg) == -EPROBE_DEFER)
241 return -EPROBE_DEFER;
242 dev_info(&pdev->dev, "couldn't get charger regulator\n");
244 charger->edev = extcon_get_extcon_dev("max8997-muic");
245 if (IS_ERR(charger->edev)) {
246 dev_err_probe(charger->dev, PTR_ERR(charger->edev),
247 "couldn't get extcon device: max8997-muic\n");
248 return PTR_ERR(charger->edev);
251 if (!IS_ERR(charger->reg) && !IS_ERR_OR_NULL(charger->edev)) {
252 ret = devm_work_autocancel(&pdev->dev, &charger->extcon_work,
253 max8997_battery_extcon_evt_worker);
255 dev_err(&pdev->dev, "failed to add extcon evt stop action: %d\n", ret);
258 charger->extcon_nb.notifier_call = max8997_battery_extcon_evt;
259 ret = devm_extcon_register_notifier_all(&pdev->dev, charger->edev,
260 &charger->extcon_nb);
262 dev_err(&pdev->dev, "failed to register extcon notifier\n");
270 static const struct platform_device_id max8997_battery_id[] = {
271 { "max8997-battery", 0 },
274 MODULE_DEVICE_TABLE(platform, max8997_battery_id);
276 static struct platform_driver max8997_battery_driver = {
278 .name = "max8997-battery",
280 .probe = max8997_battery_probe,
281 .id_table = max8997_battery_id,
283 module_platform_driver(max8997_battery_driver);
285 MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver");
286 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
287 MODULE_LICENSE("GPL");