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bb4ce970 DK |
1 | /* |
2 | * max8998_charger.c - Power supply consumer driver for the Maxim 8998/LP3974 | |
3 | * | |
4 | * Copyright (C) 2009-2010 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/max8998.h> | |
27 | #include <linux/mfd/max8998-private.h> | |
28 | ||
29 | struct max8998_battery_data { | |
30 | struct device *dev; | |
31 | struct max8998_dev *iodev; | |
32 | struct power_supply battery; | |
33 | }; | |
34 | ||
35 | static enum power_supply_property max8998_battery_props[] = { | |
36 | POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */ | |
37 | POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */ | |
38 | }; | |
39 | ||
40 | /* Note that the charger control is done by a current regulator "CHARGER" */ | |
41 | static int max8998_battery_get_property(struct power_supply *psy, | |
42 | enum power_supply_property psp, | |
43 | union power_supply_propval *val) | |
44 | { | |
45 | struct max8998_battery_data *max8998 = container_of(psy, | |
46 | struct max8998_battery_data, battery); | |
47 | struct i2c_client *i2c = max8998->iodev->i2c; | |
48 | int ret; | |
49 | u8 reg; | |
50 | ||
51 | switch (psp) { | |
52 | case POWER_SUPPLY_PROP_PRESENT: | |
53 | ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, ®); | |
54 | if (ret) | |
55 | return ret; | |
56 | if (reg & (1 << 4)) | |
57 | val->intval = 0; | |
58 | else | |
59 | val->intval = 1; | |
60 | break; | |
61 | case POWER_SUPPLY_PROP_ONLINE: | |
62 | ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, ®); | |
63 | if (ret) | |
64 | return ret; | |
65 | if (reg & (1 << 3)) | |
66 | val->intval = 0; | |
67 | else | |
68 | val->intval = 1; | |
69 | break; | |
70 | default: | |
71 | return -EINVAL; | |
72 | } | |
73 | ||
74 | return 0; | |
75 | } | |
76 | ||
77 | static __devinit int max8998_battery_probe(struct platform_device *pdev) | |
78 | { | |
79 | struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent); | |
80 | struct max8998_platform_data *pdata = dev_get_platdata(iodev->dev); | |
81 | struct max8998_battery_data *max8998; | |
82 | struct i2c_client *i2c; | |
83 | int ret = 0; | |
84 | ||
85 | if (!pdata) { | |
86 | dev_err(pdev->dev.parent, "No platform init data supplied\n"); | |
87 | return -ENODEV; | |
88 | } | |
89 | ||
90 | max8998 = kzalloc(sizeof(struct max8998_battery_data), GFP_KERNEL); | |
91 | if (!max8998) | |
92 | return -ENOMEM; | |
93 | ||
94 | max8998->dev = &pdev->dev; | |
95 | max8998->iodev = iodev; | |
96 | platform_set_drvdata(pdev, max8998); | |
97 | i2c = max8998->iodev->i2c; | |
98 | ||
99 | /* Setup "End of Charge" */ | |
100 | /* If EOC value equals 0, | |
101 | * remain value set from bootloader or default value */ | |
102 | if (pdata->eoc >= 10 && pdata->eoc <= 45) { | |
103 | max8998_update_reg(i2c, MAX8998_REG_CHGR1, | |
104 | (pdata->eoc / 5 - 2) << 5, 0x7 << 5); | |
105 | } else if (pdata->eoc == 0) { | |
106 | dev_dbg(max8998->dev, | |
107 | "EOC value not set: leave it unchanged.\n"); | |
108 | } else { | |
109 | dev_err(max8998->dev, "Invalid EOC value\n"); | |
110 | ret = -EINVAL; | |
111 | goto err; | |
112 | } | |
113 | ||
114 | /* Setup Charge Restart Level */ | |
115 | switch (pdata->restart) { | |
116 | case 100: | |
117 | max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x1 << 3, 0x3 << 3); | |
118 | break; | |
119 | case 150: | |
120 | max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x0 << 3, 0x3 << 3); | |
121 | break; | |
122 | case 200: | |
123 | max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x2 << 3, 0x3 << 3); | |
124 | break; | |
125 | case -1: | |
126 | max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x3 << 3, 0x3 << 3); | |
127 | break; | |
128 | case 0: | |
129 | dev_dbg(max8998->dev, | |
130 | "Restart Level not set: leave it unchanged.\n"); | |
131 | break; | |
132 | default: | |
133 | dev_err(max8998->dev, "Invalid Restart Level\n"); | |
134 | ret = -EINVAL; | |
135 | goto err; | |
136 | } | |
137 | ||
138 | /* Setup Charge Full Timeout */ | |
139 | switch (pdata->timeout) { | |
140 | case 5: | |
141 | max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x0 << 4, 0x3 << 4); | |
142 | break; | |
143 | case 6: | |
144 | max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x1 << 4, 0x3 << 4); | |
145 | break; | |
146 | case 7: | |
147 | max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x2 << 4, 0x3 << 4); | |
148 | break; | |
149 | case -1: | |
150 | max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x3 << 4, 0x3 << 4); | |
151 | break; | |
152 | case 0: | |
153 | dev_dbg(max8998->dev, | |
154 | "Full Timeout not set: leave it unchanged.\n"); | |
155 | default: | |
156 | dev_err(max8998->dev, "Invalid Full Timeout value\n"); | |
157 | ret = -EINVAL; | |
158 | goto err; | |
159 | } | |
160 | ||
161 | max8998->battery.name = "max8998_pmic"; | |
162 | max8998->battery.type = POWER_SUPPLY_TYPE_BATTERY; | |
163 | max8998->battery.get_property = max8998_battery_get_property; | |
164 | max8998->battery.properties = max8998_battery_props; | |
165 | max8998->battery.num_properties = ARRAY_SIZE(max8998_battery_props); | |
166 | ||
167 | ret = power_supply_register(max8998->dev, &max8998->battery); | |
168 | if (ret) { | |
169 | dev_err(max8998->dev, "failed: power supply register\n"); | |
170 | goto err; | |
171 | } | |
172 | ||
173 | return 0; | |
174 | err: | |
175 | kfree(max8998); | |
176 | return ret; | |
177 | } | |
178 | ||
179 | static int __devexit max8998_battery_remove(struct platform_device *pdev) | |
180 | { | |
181 | struct max8998_battery_data *max8998 = platform_get_drvdata(pdev); | |
182 | ||
183 | power_supply_unregister(&max8998->battery); | |
184 | kfree(max8998); | |
185 | ||
186 | return 0; | |
187 | } | |
188 | ||
189 | static const struct platform_device_id max8998_battery_id[] = { | |
190 | { "max8998-battery", TYPE_MAX8998 }, | |
191 | }; | |
192 | ||
193 | static struct platform_driver max8998_battery_driver = { | |
194 | .driver = { | |
195 | .name = "max8998-battery", | |
196 | .owner = THIS_MODULE, | |
197 | }, | |
198 | .probe = max8998_battery_probe, | |
199 | .remove = __devexit_p(max8998_battery_remove), | |
200 | .id_table = max8998_battery_id, | |
201 | }; | |
202 | ||
203 | static int __init max8998_battery_init(void) | |
204 | { | |
205 | return platform_driver_register(&max8998_battery_driver); | |
206 | } | |
207 | module_init(max8998_battery_init); | |
208 | ||
209 | static void __exit max8998_battery_cleanup(void) | |
210 | { | |
211 | platform_driver_unregister(&max8998_battery_driver); | |
212 | } | |
213 | module_exit(max8998_battery_cleanup); | |
214 | ||
215 | MODULE_DESCRIPTION("MAXIM 8998 battery control driver"); | |
216 | MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); | |
217 | MODULE_LICENSE("GPL"); | |
218 | MODULE_ALIAS("platform:max8998-battery"); |