1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | // |
3 | // max8998_charger.c - Power supply consumer driver for the Maxim 8998/LP3974 |
4 | // |
5 | // Copyright (C) 2009-2010 Samsung Electronics |
6 | // MyungJoo Ham <myungjoo.ham@samsung.com> |
7 | |
8 | #include <linux/err.h> |
9 | #include <linux/module.h> |
10 | #include <linux/mod_devicetable.h> |
11 | #include <linux/slab.h> |
12 | #include <linux/platform_device.h> |
13 | #include <linux/power_supply.h> |
14 | #include <linux/mfd/max8998.h> |
15 | #include <linux/mfd/max8998-private.h> |
16 | |
17 | struct max8998_battery_data { |
18 | struct device *dev; |
19 | struct max8998_dev *iodev; |
20 | struct power_supply *battery; |
21 | }; |
22 | |
23 | static enum power_supply_property max8998_battery_props[] = { |
24 | POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */ |
25 | POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */ |
26 | POWER_SUPPLY_PROP_STATUS, /* charger is charging/discharging/full */ |
27 | }; |
28 | |
29 | /* Note that the charger control is done by a current regulator "CHARGER" */ |
30 | static int max8998_battery_get_property(struct power_supply *psy, |
31 | enum power_supply_property psp, |
32 | union power_supply_propval *val) |
33 | { |
34 | struct max8998_battery_data *max8998 = power_supply_get_drvdata(psy); |
35 | struct i2c_client *i2c = max8998->iodev->i2c; |
36 | int ret; |
37 | u8 reg; |
38 | |
39 | switch (psp) { |
40 | case POWER_SUPPLY_PROP_PRESENT: |
41 | ret = max8998_read_reg(i2c, reg: MAX8998_REG_STATUS2, dest: ®); |
42 | if (ret) |
43 | return ret; |
44 | if (reg & (1 << 4)) |
45 | val->intval = 0; |
46 | else |
47 | val->intval = 1; |
48 | break; |
49 | case POWER_SUPPLY_PROP_ONLINE: |
50 | ret = max8998_read_reg(i2c, reg: MAX8998_REG_STATUS2, dest: ®); |
51 | if (ret) |
52 | return ret; |
53 | |
54 | if (reg & (1 << 5)) |
55 | val->intval = 1; |
56 | else |
57 | val->intval = 0; |
58 | |
59 | break; |
60 | case POWER_SUPPLY_PROP_STATUS: |
61 | ret = max8998_read_reg(i2c, reg: MAX8998_REG_STATUS2, dest: ®); |
62 | if (ret) |
63 | return ret; |
64 | |
65 | if (!(reg & (1 << 5))) { |
66 | val->intval = POWER_SUPPLY_STATUS_DISCHARGING; |
67 | } else { |
68 | if (reg & (1 << 6)) |
69 | val->intval = POWER_SUPPLY_STATUS_FULL; |
70 | else if (reg & (1 << 3)) |
71 | val->intval = POWER_SUPPLY_STATUS_CHARGING; |
72 | else |
73 | val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; |
74 | } |
75 | break; |
76 | default: |
77 | return -EINVAL; |
78 | } |
79 | |
80 | return 0; |
81 | } |
82 | |
83 | static const struct power_supply_desc max8998_battery_desc = { |
84 | .name = "max8998_pmic" , |
85 | .type = POWER_SUPPLY_TYPE_BATTERY, |
86 | .get_property = max8998_battery_get_property, |
87 | .properties = max8998_battery_props, |
88 | .num_properties = ARRAY_SIZE(max8998_battery_props), |
89 | }; |
90 | |
91 | static int max8998_battery_probe(struct platform_device *pdev) |
92 | { |
93 | struct max8998_dev *iodev = dev_get_drvdata(dev: pdev->dev.parent); |
94 | struct max8998_platform_data *pdata = iodev->pdata; |
95 | struct power_supply_config psy_cfg = {}; |
96 | struct max8998_battery_data *max8998; |
97 | struct i2c_client *i2c; |
98 | int ret = 0; |
99 | |
100 | if (!pdata) { |
101 | dev_err(pdev->dev.parent, "No platform init data supplied\n" ); |
102 | return -ENODEV; |
103 | } |
104 | |
105 | max8998 = devm_kzalloc(dev: &pdev->dev, size: sizeof(struct max8998_battery_data), |
106 | GFP_KERNEL); |
107 | if (!max8998) |
108 | return -ENOMEM; |
109 | |
110 | max8998->dev = &pdev->dev; |
111 | max8998->iodev = iodev; |
112 | platform_set_drvdata(pdev, data: max8998); |
113 | i2c = max8998->iodev->i2c; |
114 | |
115 | /* Setup "End of Charge" */ |
116 | /* If EOC value equals 0, |
117 | * remain value set from bootloader or default value */ |
118 | if (pdata->eoc >= 10 && pdata->eoc <= 45) { |
119 | max8998_update_reg(i2c, reg: MAX8998_REG_CHGR1, |
120 | val: (pdata->eoc / 5 - 2) << 5, mask: 0x7 << 5); |
121 | } else if (pdata->eoc == 0) { |
122 | dev_dbg(max8998->dev, |
123 | "EOC value not set: leave it unchanged.\n" ); |
124 | } else { |
125 | dev_err(max8998->dev, "Invalid EOC value\n" ); |
126 | return -EINVAL; |
127 | } |
128 | |
129 | /* Setup Charge Restart Level */ |
130 | switch (pdata->restart) { |
131 | case 100: |
132 | max8998_update_reg(i2c, reg: MAX8998_REG_CHGR1, val: 0x1 << 3, mask: 0x3 << 3); |
133 | break; |
134 | case 150: |
135 | max8998_update_reg(i2c, reg: MAX8998_REG_CHGR1, val: 0x0 << 3, mask: 0x3 << 3); |
136 | break; |
137 | case 200: |
138 | max8998_update_reg(i2c, reg: MAX8998_REG_CHGR1, val: 0x2 << 3, mask: 0x3 << 3); |
139 | break; |
140 | case -1: |
141 | max8998_update_reg(i2c, reg: MAX8998_REG_CHGR1, val: 0x3 << 3, mask: 0x3 << 3); |
142 | break; |
143 | case 0: |
144 | dev_dbg(max8998->dev, |
145 | "Restart Level not set: leave it unchanged.\n" ); |
146 | break; |
147 | default: |
148 | dev_err(max8998->dev, "Invalid Restart Level\n" ); |
149 | return -EINVAL; |
150 | } |
151 | |
152 | /* Setup Charge Full Timeout */ |
153 | switch (pdata->timeout) { |
154 | case 5: |
155 | max8998_update_reg(i2c, reg: MAX8998_REG_CHGR2, val: 0x0 << 4, mask: 0x3 << 4); |
156 | break; |
157 | case 6: |
158 | max8998_update_reg(i2c, reg: MAX8998_REG_CHGR2, val: 0x1 << 4, mask: 0x3 << 4); |
159 | break; |
160 | case 7: |
161 | max8998_update_reg(i2c, reg: MAX8998_REG_CHGR2, val: 0x2 << 4, mask: 0x3 << 4); |
162 | break; |
163 | case -1: |
164 | max8998_update_reg(i2c, reg: MAX8998_REG_CHGR2, val: 0x3 << 4, mask: 0x3 << 4); |
165 | break; |
166 | case 0: |
167 | dev_dbg(max8998->dev, |
168 | "Full Timeout not set: leave it unchanged.\n" ); |
169 | break; |
170 | default: |
171 | dev_err(max8998->dev, "Invalid Full Timeout value\n" ); |
172 | return -EINVAL; |
173 | } |
174 | |
175 | psy_cfg.drv_data = max8998; |
176 | |
177 | max8998->battery = devm_power_supply_register(parent: max8998->dev, |
178 | desc: &max8998_battery_desc, |
179 | cfg: &psy_cfg); |
180 | if (IS_ERR(ptr: max8998->battery)) { |
181 | ret = PTR_ERR(ptr: max8998->battery); |
182 | dev_err(max8998->dev, "failed: power supply register: %d\n" , |
183 | ret); |
184 | return ret; |
185 | } |
186 | |
187 | return 0; |
188 | } |
189 | |
190 | static const struct platform_device_id max8998_battery_id[] = { |
191 | { "max8998-battery" , TYPE_MAX8998 }, |
192 | { } |
193 | }; |
194 | |
195 | static struct platform_driver max8998_battery_driver = { |
196 | .driver = { |
197 | .name = "max8998-battery" , |
198 | }, |
199 | .probe = max8998_battery_probe, |
200 | .id_table = max8998_battery_id, |
201 | }; |
202 | |
203 | module_platform_driver(max8998_battery_driver); |
204 | |
205 | MODULE_DESCRIPTION("MAXIM 8998 battery control driver" ); |
206 | MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>" ); |
207 | MODULE_LICENSE("GPL" ); |
208 | MODULE_ALIAS("platform:max8998-battery" ); |
209 | |