1// SPDX-License-Identifier: GPL-2.0+
2//
3// max8997_charger.c - Power supply consumer driver for the Maxim 8997/8966
4//
5// Copyright (C) 2011 Samsung Electronics
6// MyungJoo Ham <myungjoo.ham@samsung.com>
7
8#include <linux/err.h>
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>
18
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)
24
25/* MAX8997_REG_MBCCTRL1 */
26#define TFCH_SHIFT 4
27#define TFCH_MASK (7 << TFCH_SHIFT)
28
29/* MAX8997_REG_MBCCTRL5 */
30#define ITOPOFF_SHIFT 0
31#define ITOPOFF_MASK (0xF << ITOPOFF_SHIFT)
32
33struct charger_data {
34 struct device *dev;
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;
41};
42
43static 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 */
47};
48
49/* Note that the charger control is done by a current regulator "CHARGER" */
50static int max8997_battery_get_property(struct power_supply *psy,
51 enum power_supply_property psp,
52 union power_supply_propval *val)
53{
54 struct charger_data *charger = power_supply_get_drvdata(psy);
55 struct i2c_client *i2c = charger->iodev->i2c;
56 int ret;
57 u8 reg;
58
59 switch (psp) {
60 case POWER_SUPPLY_PROP_STATUS:
61 val->intval = 0;
62 ret = max8997_read_reg(i2c, reg: MAX8997_REG_STATUS4, dest: &reg);
63 if (ret)
64 return ret;
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;
69 else
70 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
71
72 break;
73 case POWER_SUPPLY_PROP_PRESENT:
74 val->intval = 0;
75 ret = max8997_read_reg(i2c, reg: MAX8997_REG_STATUS4, dest: &reg);
76 if (ret)
77 return ret;
78 if ((reg & DETBAT_MASK) == 0x0)
79 val->intval = 1;
80
81 break;
82 case POWER_SUPPLY_PROP_ONLINE:
83 val->intval = 0;
84 ret = max8997_read_reg(i2c, reg: MAX8997_REG_STATUS4, dest: &reg);
85 if (ret)
86 return ret;
87 if (reg & DCINOK_MASK)
88 val->intval = 1;
89
90 break;
91 default:
92 return -EINVAL;
93 }
94
95 return 0;
96}
97
98static void max8997_battery_extcon_evt_worker(struct work_struct *work)
99{
100 struct charger_data *charger =
101 container_of(work, struct charger_data, extcon_work);
102 struct extcon_dev *edev = charger->edev;
103 int current_limit;
104
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;
120 } else {
121 dev_dbg(charger->dev, "USB charger is disconnected\n");
122 current_limit = -1;
123 }
124
125 if (current_limit > 0) {
126 int ret = regulator_set_current_limit(regulator: charger->reg, min_uA: current_limit, max_uA: current_limit);
127
128 if (ret) {
129 dev_err(charger->dev, "failed to set current limit: %d\n", ret);
130 return;
131 }
132 ret = regulator_enable(regulator: charger->reg);
133 if (ret)
134 dev_err(charger->dev, "failed to enable regulator: %d\n", ret);
135 } else {
136 int ret = regulator_disable(regulator: charger->reg);
137
138 if (ret)
139 dev_err(charger->dev, "failed to disable regulator: %d\n", ret);
140 }
141}
142
143static int max8997_battery_extcon_evt(struct notifier_block *nb,
144 unsigned long event, void *param)
145{
146 struct charger_data *charger =
147 container_of(nb, struct charger_data, extcon_nb);
148 schedule_work(work: &charger->extcon_work);
149 return NOTIFY_OK;
150}
151
152static 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),
158};
159
160static int max8997_battery_probe(struct platform_device *pdev)
161{
162 int ret = 0;
163 struct charger_data *charger;
164 struct max8997_dev *iodev = dev_get_drvdata(dev: 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 = {};
169
170 if (!pdata) {
171 dev_err(&pdev->dev, "No platform data supplied.\n");
172 return -EINVAL;
173 }
174
175 if (pdata->eoc_mA) {
176 int val = (pdata->eoc_mA - 50) / 10;
177 if (val < 0)
178 val = 0;
179 if (val > 0xf)
180 val = 0xf;
181
182 ret = max8997_update_reg(i2c, reg: MAX8997_REG_MBCCTRL5,
183 val: val << ITOPOFF_SHIFT, ITOPOFF_MASK);
184 if (ret < 0) {
185 dev_err(&pdev->dev, "Cannot use i2c bus.\n");
186 return ret;
187 }
188 }
189 switch (pdata->timeout) {
190 case 5:
191 ret = max8997_update_reg(i2c, reg: MAX8997_REG_MBCCTRL1,
192 val: 0x2 << TFCH_SHIFT, TFCH_MASK);
193 break;
194 case 6:
195 ret = max8997_update_reg(i2c, reg: MAX8997_REG_MBCCTRL1,
196 val: 0x3 << TFCH_SHIFT, TFCH_MASK);
197 break;
198 case 7:
199 ret = max8997_update_reg(i2c, reg: MAX8997_REG_MBCCTRL1,
200 val: 0x4 << TFCH_SHIFT, TFCH_MASK);
201 break;
202 case 0:
203 ret = max8997_update_reg(i2c, reg: MAX8997_REG_MBCCTRL1,
204 val: 0x7 << TFCH_SHIFT, TFCH_MASK);
205 break;
206 default:
207 dev_err(&pdev->dev, "incorrect timeout value (%d)\n",
208 pdata->timeout);
209 return -EINVAL;
210 }
211 if (ret < 0) {
212 dev_err(&pdev->dev, "Cannot use i2c bus.\n");
213 return ret;
214 }
215
216 charger = devm_kzalloc(dev: &pdev->dev, size: sizeof(*charger), GFP_KERNEL);
217 if (!charger)
218 return -ENOMEM;
219
220 platform_set_drvdata(pdev, data: charger);
221
222 charger->dev = &pdev->dev;
223 charger->iodev = iodev;
224
225 psy_cfg.drv_data = charger;
226
227 charger->battery = devm_power_supply_register(parent: &pdev->dev,
228 desc: &max8997_battery_desc,
229 cfg: &psy_cfg);
230 if (IS_ERR(ptr: charger->battery)) {
231 dev_err(&pdev->dev, "failed: power supply register\n");
232 return PTR_ERR(ptr: charger->battery);
233 }
234
235 // grab regulator from parent device's node
236 pdev->dev.of_node = iodev->dev->of_node;
237 charger->reg = devm_regulator_get_optional(dev: &pdev->dev, id: "charger");
238 pdev->dev.of_node = np;
239 if (IS_ERR(ptr: charger->reg)) {
240 if (PTR_ERR(ptr: charger->reg) == -EPROBE_DEFER)
241 return -EPROBE_DEFER;
242 dev_info(&pdev->dev, "couldn't get charger regulator\n");
243 }
244 charger->edev = extcon_get_extcon_dev(extcon_name: "max8997-muic");
245 if (IS_ERR(ptr: charger->edev)) {
246 dev_err_probe(dev: charger->dev, err: PTR_ERR(ptr: charger->edev),
247 fmt: "couldn't get extcon device: max8997-muic\n");
248 return PTR_ERR(ptr: charger->edev);
249 }
250
251 if (!IS_ERR(ptr: charger->reg) && !IS_ERR_OR_NULL(ptr: charger->edev)) {
252 ret = devm_work_autocancel(dev: &pdev->dev, w: &charger->extcon_work,
253 worker: max8997_battery_extcon_evt_worker);
254 if (ret) {
255 dev_err(&pdev->dev, "failed to add extcon evt stop action: %d\n", ret);
256 return ret;
257 }
258 charger->extcon_nb.notifier_call = max8997_battery_extcon_evt;
259 ret = devm_extcon_register_notifier_all(dev: &pdev->dev, edev: charger->edev,
260 nb: &charger->extcon_nb);
261 if (ret) {
262 dev_err(&pdev->dev, "failed to register extcon notifier\n");
263 return ret;
264 }
265 }
266
267 return 0;
268}
269
270static const struct platform_device_id max8997_battery_id[] = {
271 { "max8997-battery", 0 },
272 { }
273};
274MODULE_DEVICE_TABLE(platform, max8997_battery_id);
275
276static struct platform_driver max8997_battery_driver = {
277 .driver = {
278 .name = "max8997-battery",
279 },
280 .probe = max8997_battery_probe,
281 .id_table = max8997_battery_id,
282};
283module_platform_driver(max8997_battery_driver);
284
285MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver");
286MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
287MODULE_LICENSE("GPL");
288

source code of linux/drivers/power/supply/max8997_charger.c