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 | |
33 | struct 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 | |
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 */ |
47 | }; |
48 | |
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) |
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: ®); |
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: ®); |
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: ®); |
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 | |
98 | static 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 | |
143 | static 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 | |
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), |
158 | }; |
159 | |
160 | static 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 | |
270 | static const struct platform_device_id max8997_battery_id[] = { |
271 | { "max8997-battery" , 0 }, |
272 | { } |
273 | }; |
274 | MODULE_DEVICE_TABLE(platform, max8997_battery_id); |
275 | |
276 | static 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 | }; |
283 | module_platform_driver(max8997_battery_driver); |
284 | |
285 | MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver" ); |
286 | MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>" ); |
287 | MODULE_LICENSE("GPL" ); |
288 | |