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149c077b DK |
1 | /* |
2 | * max8997_charger.c - Power supply consumer driver for the Maxim 8997/8966 | |
3 | * | |
4 | * Copyright (C) 2011 Samsung Electronics | |
5 | * MyungJoo Ham <myungjoo.ham@samsung.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | */ | |
21 | ||
22 | #include <linux/err.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/platform_device.h> | |
25 | #include <linux/power_supply.h> | |
26 | #include <linux/mfd/max8997.h> | |
27 | #include <linux/mfd/max8997-private.h> | |
28 | ||
29 | struct charger_data { | |
30 | struct device *dev; | |
31 | struct max8997_dev *iodev; | |
32 | struct power_supply battery; | |
33 | }; | |
34 | ||
35 | static enum power_supply_property max8997_battery_props[] = { | |
36 | POWER_SUPPLY_PROP_STATUS, /* "FULL" or "NOT FULL" only. */ | |
37 | POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */ | |
38 | POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */ | |
39 | }; | |
40 | ||
41 | /* Note that the charger control is done by a current regulator "CHARGER" */ | |
42 | static int max8997_battery_get_property(struct power_supply *psy, | |
43 | enum power_supply_property psp, | |
44 | union power_supply_propval *val) | |
45 | { | |
46 | struct charger_data *charger = container_of(psy, | |
47 | struct charger_data, battery); | |
48 | struct i2c_client *i2c = charger->iodev->i2c; | |
49 | int ret; | |
50 | u8 reg; | |
51 | ||
52 | switch (psp) { | |
53 | case POWER_SUPPLY_PROP_STATUS: | |
54 | val->intval = 0; | |
55 | ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®); | |
56 | if (ret) | |
57 | return ret; | |
58 | if ((reg & (1 << 0)) == 0x1) | |
59 | val->intval = POWER_SUPPLY_STATUS_FULL; | |
60 | ||
61 | break; | |
62 | case POWER_SUPPLY_PROP_PRESENT: | |
63 | val->intval = 0; | |
64 | ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®); | |
65 | if (ret) | |
66 | return ret; | |
67 | if ((reg & (1 << 2)) == 0x0) | |
68 | val->intval = 1; | |
69 | ||
70 | break; | |
71 | case POWER_SUPPLY_PROP_ONLINE: | |
72 | val->intval = 0; | |
73 | ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®); | |
74 | if (ret) | |
75 | return ret; | |
76 | /* DCINOK */ | |
77 | if (reg & (1 << 1)) | |
78 | val->intval = 1; | |
79 | ||
80 | break; | |
81 | default: | |
82 | return -EINVAL; | |
83 | } | |
84 | ||
85 | return 0; | |
86 | } | |
87 | ||
88 | static __devinit int max8997_battery_probe(struct platform_device *pdev) | |
89 | { | |
90 | int ret = 0; | |
91 | struct charger_data *charger; | |
92 | struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent); | |
93 | struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev); | |
94 | ||
95 | if (!pdata) | |
96 | return -EINVAL; | |
97 | ||
98 | if (pdata->eoc_mA) { | |
99 | u8 val = (pdata->eoc_mA - 50) / 10; | |
100 | if (val < 0) | |
101 | val = 0; | |
102 | if (val > 0xf) | |
103 | val = 0xf; | |
104 | ||
105 | ret = max8997_update_reg(iodev->i2c, | |
106 | MAX8997_REG_MBCCTRL5, val, 0xf); | |
107 | if (ret < 0) { | |
108 | dev_err(&pdev->dev, "Cannot use i2c bus.\n"); | |
109 | return ret; | |
110 | } | |
111 | } | |
112 | ||
113 | switch (pdata->timeout) { | |
114 | case 5: | |
115 | ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1, | |
116 | 0x2 << 4, 0x7 << 4); | |
117 | break; | |
118 | case 6: | |
119 | ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1, | |
120 | 0x3 << 4, 0x7 << 4); | |
121 | break; | |
122 | case 7: | |
123 | ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1, | |
124 | 0x4 << 4, 0x7 << 4); | |
125 | break; | |
126 | case 0: | |
127 | ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1, | |
128 | 0x7 << 4, 0x7 << 4); | |
129 | break; | |
130 | default: | |
131 | dev_err(&pdev->dev, "incorrect timeout value (%d)\n", | |
132 | pdata->timeout); | |
133 | return -EINVAL; | |
134 | } | |
135 | if (ret < 0) { | |
136 | dev_err(&pdev->dev, "Cannot use i2c bus.\n"); | |
137 | return ret; | |
138 | } | |
139 | ||
140 | charger = kzalloc(sizeof(struct charger_data), GFP_KERNEL); | |
141 | if (charger == NULL) { | |
142 | dev_err(&pdev->dev, "Cannot allocate memory.\n"); | |
143 | return -ENOMEM; | |
144 | } | |
145 | ||
146 | platform_set_drvdata(pdev, charger); | |
147 | ||
148 | charger->battery.name = "max8997_pmic"; | |
149 | charger->battery.type = POWER_SUPPLY_TYPE_BATTERY; | |
150 | charger->battery.get_property = max8997_battery_get_property; | |
151 | charger->battery.properties = max8997_battery_props; | |
152 | charger->battery.num_properties = ARRAY_SIZE(max8997_battery_props); | |
153 | ||
154 | charger->dev = &pdev->dev; | |
155 | charger->iodev = iodev; | |
156 | ||
157 | ret = power_supply_register(&pdev->dev, &charger->battery); | |
158 | if (ret) { | |
159 | dev_err(&pdev->dev, "failed: power supply register\n"); | |
160 | goto err; | |
161 | } | |
162 | ||
163 | return 0; | |
164 | err: | |
165 | kfree(charger); | |
166 | return ret; | |
167 | } | |
168 | ||
169 | static int __devexit max8997_battery_remove(struct platform_device *pdev) | |
170 | { | |
171 | struct charger_data *charger = platform_get_drvdata(pdev); | |
172 | ||
173 | power_supply_unregister(&charger->battery); | |
174 | kfree(charger); | |
175 | return 0; | |
176 | } | |
177 | ||
178 | static const struct platform_device_id max8997_battery_id[] = { | |
179 | { "max8997-battery", 0 }, | |
180 | }; | |
181 | ||
182 | static struct platform_driver max8997_battery_driver = { | |
183 | .driver = { | |
184 | .name = "max8997-battery", | |
185 | .owner = THIS_MODULE, | |
186 | }, | |
187 | .probe = max8997_battery_probe, | |
188 | .remove = __devexit_p(max8997_battery_remove), | |
189 | .id_table = max8997_battery_id, | |
190 | }; | |
191 | ||
192 | static int __init max8997_battery_init(void) | |
193 | { | |
194 | return platform_driver_register(&max8997_battery_driver); | |
195 | } | |
196 | subsys_initcall(max8997_battery_init); | |
197 | ||
198 | static void __exit max8997_battery_cleanup(void) | |
199 | { | |
200 | platform_driver_unregister(&max8997_battery_driver); | |
201 | } | |
202 | module_exit(max8997_battery_cleanup); | |
203 | ||
204 | MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver"); | |
205 | MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); | |
206 | MODULE_LICENSE("GPL"); |