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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
18
19#define DCINOK_SHIFT 1
20#define DCINOK_MASK (1 << DCINOK_SHIFT)
21#define DETBAT_SHIFT 2
22#define DETBAT_MASK (1 << DETBAT_SHIFT)
23
24
25#define TFCH_SHIFT 4
26#define TFCH_MASK (7 << TFCH_SHIFT)
27
28
29#define ITOPOFF_SHIFT 0
30#define ITOPOFF_MASK (0xF << ITOPOFF_SHIFT)
31
32struct charger_data {
33 struct device *dev;
34 struct max8997_dev *iodev;
35 struct power_supply *battery;
36 struct regulator *reg;
37 struct extcon_dev *edev;
38 struct notifier_block extcon_nb;
39 struct work_struct extcon_work;
40};
41
42static enum power_supply_property max8997_battery_props[] = {
43 POWER_SUPPLY_PROP_STATUS,
44 POWER_SUPPLY_PROP_PRESENT,
45 POWER_SUPPLY_PROP_ONLINE,
46};
47
48
49static int max8997_battery_get_property(struct power_supply *psy,
50 enum power_supply_property psp,
51 union power_supply_propval *val)
52{
53 struct charger_data *charger = power_supply_get_drvdata(psy);
54 struct i2c_client *i2c = charger->iodev->i2c;
55 int ret;
56 u8 reg;
57
58 switch (psp) {
59 case POWER_SUPPLY_PROP_STATUS:
60 val->intval = 0;
61 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
62 if (ret)
63 return ret;
64 if ((reg & (1 << 0)) == 0x1)
65 val->intval = POWER_SUPPLY_STATUS_FULL;
66 else if ((reg & DCINOK_MASK))
67 val->intval = POWER_SUPPLY_STATUS_CHARGING;
68 else
69 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
70
71 break;
72 case POWER_SUPPLY_PROP_PRESENT:
73 val->intval = 0;
74 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
75 if (ret)
76 return ret;
77 if ((reg & DETBAT_MASK) == 0x0)
78 val->intval = 1;
79
80 break;
81 case POWER_SUPPLY_PROP_ONLINE:
82 val->intval = 0;
83 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®);
84 if (ret)
85 return ret;
86 if (reg & DCINOK_MASK)
87 val->intval = 1;
88
89 break;
90 default:
91 return -EINVAL;
92 }
93
94 return 0;
95}
96
97static void max8997_battery_extcon_evt_stop_work(void *data)
98{
99 struct charger_data *charger = data;
100
101 cancel_work_sync(&charger->extcon_work);
102}
103
104static void max8997_battery_extcon_evt_worker(struct work_struct *work)
105{
106 struct charger_data *charger =
107 container_of(work, struct charger_data, extcon_work);
108 struct extcon_dev *edev = charger->edev;
109 int current_limit;
110
111 if (extcon_get_state(edev, EXTCON_CHG_USB_SDP) > 0) {
112 dev_dbg(charger->dev, "USB SDP charger is connected\n");
113 current_limit = 450000;
114 } else if (extcon_get_state(edev, EXTCON_CHG_USB_DCP) > 0) {
115 dev_dbg(charger->dev, "USB DCP charger is connected\n");
116 current_limit = 650000;
117 } else if (extcon_get_state(edev, EXTCON_CHG_USB_FAST) > 0) {
118 dev_dbg(charger->dev, "USB FAST charger is connected\n");
119 current_limit = 650000;
120 } else if (extcon_get_state(edev, EXTCON_CHG_USB_SLOW) > 0) {
121 dev_dbg(charger->dev, "USB SLOW charger is connected\n");
122 current_limit = 650000;
123 } else if (extcon_get_state(edev, EXTCON_CHG_USB_CDP) > 0) {
124 dev_dbg(charger->dev, "USB CDP charger is connected\n");
125 current_limit = 650000;
126 } else {
127 dev_dbg(charger->dev, "USB charger is disconnected\n");
128 current_limit = -1;
129 }
130
131 if (current_limit > 0) {
132 int ret = regulator_set_current_limit(charger->reg, current_limit, current_limit);
133
134 if (ret) {
135 dev_err(charger->dev, "failed to set current limit: %d\n", ret);
136 return;
137 }
138 ret = regulator_enable(charger->reg);
139 if (ret)
140 dev_err(charger->dev, "failed to enable regulator: %d\n", ret);
141 } else {
142 int ret = regulator_disable(charger->reg);
143
144 if (ret)
145 dev_err(charger->dev, "failed to disable regulator: %d\n", ret);
146 }
147}
148
149static int max8997_battery_extcon_evt(struct notifier_block *nb,
150 unsigned long event, void *param)
151{
152 struct charger_data *charger =
153 container_of(nb, struct charger_data, extcon_nb);
154 schedule_work(&charger->extcon_work);
155 return NOTIFY_OK;
156}
157
158static const struct power_supply_desc max8997_battery_desc = {
159 .name = "max8997_pmic",
160 .type = POWER_SUPPLY_TYPE_BATTERY,
161 .get_property = max8997_battery_get_property,
162 .properties = max8997_battery_props,
163 .num_properties = ARRAY_SIZE(max8997_battery_props),
164};
165
166static int max8997_battery_probe(struct platform_device *pdev)
167{
168 int ret = 0;
169 struct charger_data *charger;
170 struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
171 struct device_node *np = pdev->dev.of_node;
172 struct i2c_client *i2c = iodev->i2c;
173 struct max8997_platform_data *pdata = iodev->pdata;
174 struct power_supply_config psy_cfg = {};
175
176 if (!pdata) {
177 dev_err(&pdev->dev, "No platform data supplied.\n");
178 return -EINVAL;
179 }
180
181 if (pdata->eoc_mA) {
182 int val = (pdata->eoc_mA - 50) / 10;
183 if (val < 0)
184 val = 0;
185 if (val > 0xf)
186 val = 0xf;
187
188 ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL5,
189 val << ITOPOFF_SHIFT, ITOPOFF_MASK);
190 if (ret < 0) {
191 dev_err(&pdev->dev, "Cannot use i2c bus.\n");
192 return ret;
193 }
194 }
195 switch (pdata->timeout) {
196 case 5:
197 ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1,
198 0x2 << TFCH_SHIFT, TFCH_MASK);
199 break;
200 case 6:
201 ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1,
202 0x3 << TFCH_SHIFT, TFCH_MASK);
203 break;
204 case 7:
205 ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1,
206 0x4 << TFCH_SHIFT, TFCH_MASK);
207 break;
208 case 0:
209 ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1,
210 0x7 << TFCH_SHIFT, TFCH_MASK);
211 break;
212 default:
213 dev_err(&pdev->dev, "incorrect timeout value (%d)\n",
214 pdata->timeout);
215 return -EINVAL;
216 }
217 if (ret < 0) {
218 dev_err(&pdev->dev, "Cannot use i2c bus.\n");
219 return ret;
220 }
221
222 charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
223 if (!charger)
224 return -ENOMEM;
225
226 platform_set_drvdata(pdev, charger);
227
228 charger->dev = &pdev->dev;
229 charger->iodev = iodev;
230
231 psy_cfg.drv_data = charger;
232
233 charger->battery = devm_power_supply_register(&pdev->dev,
234 &max8997_battery_desc,
235 &psy_cfg);
236 if (IS_ERR(charger->battery)) {
237 dev_err(&pdev->dev, "failed: power supply register\n");
238 return PTR_ERR(charger->battery);
239 }
240
241
242 pdev->dev.of_node = iodev->dev->of_node;
243 charger->reg = devm_regulator_get_optional(&pdev->dev, "charger");
244 pdev->dev.of_node = np;
245 if (IS_ERR(charger->reg)) {
246 if (PTR_ERR(charger->reg) == -EPROBE_DEFER)
247 return -EPROBE_DEFER;
248 dev_info(&pdev->dev, "couldn't get charger regulator\n");
249 }
250 charger->edev = extcon_get_extcon_dev("max8997-muic");
251 if (IS_ERR_OR_NULL(charger->edev)) {
252 if (!charger->edev)
253 return -EPROBE_DEFER;
254 dev_info(charger->dev, "couldn't get extcon device\n");
255 }
256
257 if (!IS_ERR(charger->reg) && !IS_ERR_OR_NULL(charger->edev)) {
258 INIT_WORK(&charger->extcon_work, max8997_battery_extcon_evt_worker);
259 ret = devm_add_action(&pdev->dev, max8997_battery_extcon_evt_stop_work, charger);
260 if (ret) {
261 dev_err(&pdev->dev, "failed to add extcon evt stop action: %d\n", ret);
262 return ret;
263 }
264 charger->extcon_nb.notifier_call = max8997_battery_extcon_evt;
265 ret = devm_extcon_register_notifier_all(&pdev->dev, charger->edev,
266 &charger->extcon_nb);
267 if (ret) {
268 dev_err(&pdev->dev, "failed to register extcon notifier\n");
269 return ret;
270 }
271 }
272
273 return 0;
274}
275
276static const struct platform_device_id max8997_battery_id[] = {
277 { "max8997-battery", 0 },
278 { }
279};
280MODULE_DEVICE_TABLE(platform, max8997_battery_id);
281
282static struct platform_driver max8997_battery_driver = {
283 .driver = {
284 .name = "max8997-battery",
285 },
286 .probe = max8997_battery_probe,
287 .id_table = max8997_battery_id,
288};
289module_platform_driver(max8997_battery_driver);
290
291MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver");
292MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
293MODULE_LICENSE("GPL");
294
