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359ab9f5 MH |
1 | /* |
2 | * Fuel gauge driver for Maxim 17042 / 8966 / 8997 | |
3 | * Note that Maxim 8966 and 8997 are mfd and this is its subdevice. | |
4 | * | |
5 | * Copyright (C) 2011 Samsung Electronics | |
6 | * MyungJoo Ham <myungjoo.ham@samsung.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | * | |
22 | * This driver is based on max17040_battery.c | |
23 | */ | |
24 | ||
25 | #include <linux/init.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/i2c.h> | |
28 | #include <linux/mod_devicetable.h> | |
29 | #include <linux/power_supply.h> | |
30 | #include <linux/power/max17042_battery.h> | |
31 | ||
32 | enum max17042_register { | |
33 | MAX17042_STATUS = 0x00, | |
34 | MAX17042_VALRT_Th = 0x01, | |
35 | MAX17042_TALRT_Th = 0x02, | |
36 | MAX17042_SALRT_Th = 0x03, | |
37 | MAX17042_AtRate = 0x04, | |
38 | MAX17042_RepCap = 0x05, | |
39 | MAX17042_RepSOC = 0x06, | |
40 | MAX17042_Age = 0x07, | |
41 | MAX17042_TEMP = 0x08, | |
42 | MAX17042_VCELL = 0x09, | |
43 | MAX17042_Current = 0x0A, | |
44 | MAX17042_AvgCurrent = 0x0B, | |
45 | MAX17042_Qresidual = 0x0C, | |
46 | MAX17042_SOC = 0x0D, | |
47 | MAX17042_AvSOC = 0x0E, | |
48 | MAX17042_RemCap = 0x0F, | |
49 | MAX17402_FullCAP = 0x10, | |
50 | MAX17042_TTE = 0x11, | |
51 | MAX17042_V_empty = 0x12, | |
52 | ||
53 | MAX17042_RSLOW = 0x14, | |
54 | ||
55 | MAX17042_AvgTA = 0x16, | |
56 | MAX17042_Cycles = 0x17, | |
57 | MAX17042_DesignCap = 0x18, | |
58 | MAX17042_AvgVCELL = 0x19, | |
59 | MAX17042_MinMaxTemp = 0x1A, | |
60 | MAX17042_MinMaxVolt = 0x1B, | |
61 | MAX17042_MinMaxCurr = 0x1C, | |
62 | MAX17042_CONFIG = 0x1D, | |
63 | MAX17042_ICHGTerm = 0x1E, | |
64 | MAX17042_AvCap = 0x1F, | |
65 | MAX17042_ManName = 0x20, | |
66 | MAX17042_DevName = 0x21, | |
67 | MAX17042_DevChem = 0x22, | |
68 | ||
69 | MAX17042_TempNom = 0x24, | |
70 | MAX17042_TempCold = 0x25, | |
71 | MAX17042_TempHot = 0x26, | |
72 | MAX17042_AIN = 0x27, | |
73 | MAX17042_LearnCFG = 0x28, | |
74 | MAX17042_SHFTCFG = 0x29, | |
75 | MAX17042_RelaxCFG = 0x2A, | |
76 | MAX17042_MiscCFG = 0x2B, | |
77 | MAX17042_TGAIN = 0x2C, | |
78 | MAx17042_TOFF = 0x2D, | |
79 | MAX17042_CGAIN = 0x2E, | |
80 | MAX17042_COFF = 0x2F, | |
81 | ||
82 | MAX17042_Q_empty = 0x33, | |
83 | MAX17042_T_empty = 0x34, | |
84 | ||
85 | MAX17042_RCOMP0 = 0x38, | |
86 | MAX17042_TempCo = 0x39, | |
87 | MAX17042_Rx = 0x3A, | |
88 | MAX17042_T_empty0 = 0x3B, | |
89 | MAX17042_TaskPeriod = 0x3C, | |
90 | MAX17042_FSTAT = 0x3D, | |
91 | ||
92 | MAX17042_SHDNTIMER = 0x3F, | |
93 | ||
94 | MAX17042_VFRemCap = 0x4A, | |
95 | ||
96 | MAX17042_QH = 0x4D, | |
97 | MAX17042_QL = 0x4E, | |
98 | }; | |
99 | ||
100 | struct max17042_chip { | |
101 | struct i2c_client *client; | |
102 | struct power_supply battery; | |
103 | struct max17042_platform_data *pdata; | |
104 | }; | |
105 | ||
106 | static int max17042_write_reg(struct i2c_client *client, u8 reg, u16 value) | |
107 | { | |
108 | int ret = i2c_smbus_write_word_data(client, reg, value); | |
109 | ||
110 | if (ret < 0) | |
111 | dev_err(&client->dev, "%s: err %d\n", __func__, ret); | |
112 | ||
113 | return ret; | |
114 | } | |
115 | ||
116 | static int max17042_read_reg(struct i2c_client *client, u8 reg) | |
117 | { | |
118 | int ret = i2c_smbus_read_word_data(client, reg); | |
119 | ||
120 | if (ret < 0) | |
121 | dev_err(&client->dev, "%s: err %d\n", __func__, ret); | |
122 | ||
123 | return ret; | |
124 | } | |
125 | ||
126 | static enum power_supply_property max17042_battery_props[] = { | |
127 | POWER_SUPPLY_PROP_VOLTAGE_NOW, | |
128 | POWER_SUPPLY_PROP_VOLTAGE_AVG, | |
129 | POWER_SUPPLY_PROP_CAPACITY, | |
130 | }; | |
131 | ||
132 | static int max17042_get_property(struct power_supply *psy, | |
133 | enum power_supply_property psp, | |
134 | union power_supply_propval *val) | |
135 | { | |
136 | struct max17042_chip *chip = container_of(psy, | |
137 | struct max17042_chip, battery); | |
138 | ||
139 | switch (psp) { | |
140 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: | |
141 | val->intval = max17042_read_reg(chip->client, | |
142 | MAX17042_VCELL) * 83; /* 1000 / 12 = 83 */ | |
143 | break; | |
144 | case POWER_SUPPLY_PROP_VOLTAGE_AVG: | |
145 | val->intval = max17042_read_reg(chip->client, | |
146 | MAX17042_AvgVCELL) * 83; | |
147 | break; | |
148 | case POWER_SUPPLY_PROP_CAPACITY: | |
149 | val->intval = max17042_read_reg(chip->client, | |
150 | MAX17042_SOC) / 256; | |
151 | break; | |
152 | default: | |
153 | return -EINVAL; | |
154 | } | |
155 | return 0; | |
156 | } | |
157 | ||
158 | static int __devinit max17042_probe(struct i2c_client *client, | |
159 | const struct i2c_device_id *id) | |
160 | { | |
161 | struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); | |
162 | struct max17042_chip *chip; | |
163 | int ret; | |
164 | ||
165 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) | |
166 | return -EIO; | |
167 | ||
168 | chip = kzalloc(sizeof(*chip), GFP_KERNEL); | |
169 | if (!chip) | |
170 | return -ENOMEM; | |
171 | ||
172 | chip->client = client; | |
173 | chip->pdata = client->dev.platform_data; | |
174 | ||
175 | i2c_set_clientdata(client, chip); | |
176 | ||
177 | chip->battery.name = "max17042_battery"; | |
178 | chip->battery.type = POWER_SUPPLY_TYPE_BATTERY; | |
179 | chip->battery.get_property = max17042_get_property; | |
180 | chip->battery.properties = max17042_battery_props; | |
181 | chip->battery.num_properties = ARRAY_SIZE(max17042_battery_props); | |
182 | ||
183 | ret = power_supply_register(&client->dev, &chip->battery); | |
184 | if (ret) { | |
185 | dev_err(&client->dev, "failed: power supply register\n"); | |
359ab9f5 MH |
186 | kfree(chip); |
187 | return ret; | |
188 | } | |
189 | ||
190 | if (!chip->pdata->enable_current_sense) { | |
191 | max17042_write_reg(client, MAX17042_CGAIN, 0x0000); | |
192 | max17042_write_reg(client, MAX17042_MiscCFG, 0x0003); | |
193 | max17042_write_reg(client, MAX17042_LearnCFG, 0x0007); | |
194 | } | |
195 | ||
196 | return 0; | |
197 | } | |
198 | ||
199 | static int __devexit max17042_remove(struct i2c_client *client) | |
200 | { | |
201 | struct max17042_chip *chip = i2c_get_clientdata(client); | |
202 | ||
203 | power_supply_unregister(&chip->battery); | |
359ab9f5 MH |
204 | kfree(chip); |
205 | return 0; | |
206 | } | |
207 | ||
208 | static const struct i2c_device_id max17042_id[] = { | |
209 | { "max17042", 0 }, | |
210 | { } | |
211 | }; | |
212 | MODULE_DEVICE_TABLE(i2c, max17042_id); | |
213 | ||
214 | static struct i2c_driver max17042_i2c_driver = { | |
215 | .driver = { | |
216 | .name = "max17042", | |
217 | }, | |
218 | .probe = max17042_probe, | |
219 | .remove = __devexit_p(max17042_remove), | |
220 | .id_table = max17042_id, | |
221 | }; | |
222 | ||
223 | static int __init max17042_init(void) | |
224 | { | |
225 | return i2c_add_driver(&max17042_i2c_driver); | |
226 | } | |
227 | module_init(max17042_init); | |
228 | ||
229 | static void __exit max17042_exit(void) | |
230 | { | |
231 | i2c_del_driver(&max17042_i2c_driver); | |
232 | } | |
233 | module_exit(max17042_exit); | |
234 | ||
235 | MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); | |
236 | MODULE_DESCRIPTION("MAX17042 Fuel Gauge"); | |
237 | MODULE_LICENSE("GPL"); |