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1 | /* |
2 | * max17040_battery.c | |
3 | * fuel-gauge systems for lithium-ion (Li+) batteries | |
4 | * | |
5 | * Copyright (C) 2009 Samsung Electronics | |
6 | * Minkyu Kang <mk7.kang@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 version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/module.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/platform_device.h> | |
16 | #include <linux/mutex.h> | |
17 | #include <linux/err.h> | |
18 | #include <linux/i2c.h> | |
19 | #include <linux/delay.h> | |
20 | #include <linux/power_supply.h> | |
21 | #include <linux/max17040_battery.h> | |
5a0e3ad6 | 22 | #include <linux/slab.h> |
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23 | |
24 | #define MAX17040_VCELL_MSB 0x02 | |
25 | #define MAX17040_VCELL_LSB 0x03 | |
26 | #define MAX17040_SOC_MSB 0x04 | |
27 | #define MAX17040_SOC_LSB 0x05 | |
28 | #define MAX17040_MODE_MSB 0x06 | |
29 | #define MAX17040_MODE_LSB 0x07 | |
30 | #define MAX17040_VER_MSB 0x08 | |
31 | #define MAX17040_VER_LSB 0x09 | |
32 | #define MAX17040_RCOMP_MSB 0x0C | |
33 | #define MAX17040_RCOMP_LSB 0x0D | |
34 | #define MAX17040_CMD_MSB 0xFE | |
35 | #define MAX17040_CMD_LSB 0xFF | |
36 | ||
37 | #define MAX17040_DELAY 1000 | |
38 | #define MAX17040_BATTERY_FULL 95 | |
39 | ||
40 | struct max17040_chip { | |
41 | struct i2c_client *client; | |
42 | struct delayed_work work; | |
43 | struct power_supply battery; | |
44 | struct max17040_platform_data *pdata; | |
45 | ||
46 | /* State Of Connect */ | |
47 | int online; | |
48 | /* battery voltage */ | |
49 | int vcell; | |
50 | /* battery capacity */ | |
51 | int soc; | |
52 | /* State Of Charge */ | |
53 | int status; | |
54 | }; | |
55 | ||
56 | static int max17040_get_property(struct power_supply *psy, | |
57 | enum power_supply_property psp, | |
58 | union power_supply_propval *val) | |
59 | { | |
60 | struct max17040_chip *chip = container_of(psy, | |
61 | struct max17040_chip, battery); | |
62 | ||
63 | switch (psp) { | |
64 | case POWER_SUPPLY_PROP_STATUS: | |
65 | val->intval = chip->status; | |
66 | break; | |
67 | case POWER_SUPPLY_PROP_ONLINE: | |
68 | val->intval = chip->online; | |
69 | break; | |
70 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: | |
71 | val->intval = chip->vcell; | |
72 | break; | |
73 | case POWER_SUPPLY_PROP_CAPACITY: | |
74 | val->intval = chip->soc; | |
75 | break; | |
76 | default: | |
77 | return -EINVAL; | |
78 | } | |
79 | return 0; | |
80 | } | |
81 | ||
82 | static int max17040_write_reg(struct i2c_client *client, int reg, u8 value) | |
83 | { | |
84 | int ret; | |
85 | ||
86 | ret = i2c_smbus_write_byte_data(client, reg, value); | |
87 | ||
88 | if (ret < 0) | |
89 | dev_err(&client->dev, "%s: err %d\n", __func__, ret); | |
90 | ||
91 | return ret; | |
92 | } | |
93 | ||
94 | static int max17040_read_reg(struct i2c_client *client, int reg) | |
95 | { | |
96 | int ret; | |
97 | ||
98 | ret = i2c_smbus_read_byte_data(client, reg); | |
99 | ||
100 | if (ret < 0) | |
101 | dev_err(&client->dev, "%s: err %d\n", __func__, ret); | |
102 | ||
103 | return ret; | |
104 | } | |
105 | ||
106 | static void max17040_reset(struct i2c_client *client) | |
107 | { | |
108 | max17040_write_reg(client, MAX17040_CMD_MSB, 0x54); | |
109 | max17040_write_reg(client, MAX17040_CMD_LSB, 0x00); | |
110 | } | |
111 | ||
112 | static void max17040_get_vcell(struct i2c_client *client) | |
113 | { | |
114 | struct max17040_chip *chip = i2c_get_clientdata(client); | |
115 | u8 msb; | |
116 | u8 lsb; | |
117 | ||
118 | msb = max17040_read_reg(client, MAX17040_VCELL_MSB); | |
119 | lsb = max17040_read_reg(client, MAX17040_VCELL_LSB); | |
120 | ||
121 | chip->vcell = (msb << 4) + (lsb >> 4); | |
122 | } | |
123 | ||
124 | static void max17040_get_soc(struct i2c_client *client) | |
125 | { | |
126 | struct max17040_chip *chip = i2c_get_clientdata(client); | |
127 | u8 msb; | |
128 | u8 lsb; | |
129 | ||
130 | msb = max17040_read_reg(client, MAX17040_SOC_MSB); | |
131 | lsb = max17040_read_reg(client, MAX17040_SOC_LSB); | |
132 | ||
133 | chip->soc = msb; | |
134 | } | |
135 | ||
136 | static void max17040_get_version(struct i2c_client *client) | |
137 | { | |
138 | u8 msb; | |
139 | u8 lsb; | |
140 | ||
141 | msb = max17040_read_reg(client, MAX17040_VER_MSB); | |
142 | lsb = max17040_read_reg(client, MAX17040_VER_LSB); | |
143 | ||
144 | dev_info(&client->dev, "MAX17040 Fuel-Gauge Ver %d%d\n", msb, lsb); | |
145 | } | |
146 | ||
147 | static void max17040_get_online(struct i2c_client *client) | |
148 | { | |
149 | struct max17040_chip *chip = i2c_get_clientdata(client); | |
150 | ||
151 | if (chip->pdata->battery_online) | |
152 | chip->online = chip->pdata->battery_online(); | |
153 | else | |
154 | chip->online = 1; | |
155 | } | |
156 | ||
157 | static void max17040_get_status(struct i2c_client *client) | |
158 | { | |
159 | struct max17040_chip *chip = i2c_get_clientdata(client); | |
160 | ||
161 | if (!chip->pdata->charger_online || !chip->pdata->charger_enable) { | |
162 | chip->status = POWER_SUPPLY_STATUS_UNKNOWN; | |
163 | return; | |
164 | } | |
165 | ||
166 | if (chip->pdata->charger_online()) { | |
167 | if (chip->pdata->charger_enable()) | |
168 | chip->status = POWER_SUPPLY_STATUS_CHARGING; | |
169 | else | |
170 | chip->status = POWER_SUPPLY_STATUS_NOT_CHARGING; | |
171 | } else { | |
172 | chip->status = POWER_SUPPLY_STATUS_DISCHARGING; | |
173 | } | |
174 | ||
175 | if (chip->soc > MAX17040_BATTERY_FULL) | |
176 | chip->status = POWER_SUPPLY_STATUS_FULL; | |
177 | } | |
178 | ||
179 | static void max17040_work(struct work_struct *work) | |
180 | { | |
181 | struct max17040_chip *chip; | |
182 | ||
183 | chip = container_of(work, struct max17040_chip, work.work); | |
184 | ||
185 | max17040_get_vcell(chip->client); | |
186 | max17040_get_soc(chip->client); | |
187 | max17040_get_online(chip->client); | |
188 | max17040_get_status(chip->client); | |
189 | ||
190 | schedule_delayed_work(&chip->work, MAX17040_DELAY); | |
191 | } | |
192 | ||
193 | static enum power_supply_property max17040_battery_props[] = { | |
194 | POWER_SUPPLY_PROP_STATUS, | |
195 | POWER_SUPPLY_PROP_ONLINE, | |
196 | POWER_SUPPLY_PROP_VOLTAGE_NOW, | |
197 | POWER_SUPPLY_PROP_CAPACITY, | |
198 | }; | |
199 | ||
200 | static int __devinit max17040_probe(struct i2c_client *client, | |
201 | const struct i2c_device_id *id) | |
202 | { | |
203 | struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); | |
204 | struct max17040_chip *chip; | |
205 | int ret; | |
206 | ||
207 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE)) | |
208 | return -EIO; | |
209 | ||
210 | chip = kzalloc(sizeof(*chip), GFP_KERNEL); | |
211 | if (!chip) | |
212 | return -ENOMEM; | |
213 | ||
214 | chip->client = client; | |
215 | chip->pdata = client->dev.platform_data; | |
216 | ||
217 | i2c_set_clientdata(client, chip); | |
218 | ||
219 | chip->battery.name = "battery"; | |
220 | chip->battery.type = POWER_SUPPLY_TYPE_BATTERY; | |
221 | chip->battery.get_property = max17040_get_property; | |
222 | chip->battery.properties = max17040_battery_props; | |
223 | chip->battery.num_properties = ARRAY_SIZE(max17040_battery_props); | |
224 | ||
225 | ret = power_supply_register(&client->dev, &chip->battery); | |
226 | if (ret) { | |
227 | dev_err(&client->dev, "failed: power supply register\n"); | |
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228 | kfree(chip); |
229 | return ret; | |
230 | } | |
231 | ||
232 | max17040_reset(client); | |
233 | max17040_get_version(client); | |
234 | ||
235 | INIT_DELAYED_WORK_DEFERRABLE(&chip->work, max17040_work); | |
236 | schedule_delayed_work(&chip->work, MAX17040_DELAY); | |
237 | ||
238 | return 0; | |
239 | } | |
240 | ||
241 | static int __devexit max17040_remove(struct i2c_client *client) | |
242 | { | |
243 | struct max17040_chip *chip = i2c_get_clientdata(client); | |
244 | ||
245 | power_supply_unregister(&chip->battery); | |
246 | cancel_delayed_work(&chip->work); | |
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247 | kfree(chip); |
248 | return 0; | |
249 | } | |
250 | ||
251 | #ifdef CONFIG_PM | |
252 | ||
253 | static int max17040_suspend(struct i2c_client *client, | |
254 | pm_message_t state) | |
255 | { | |
256 | struct max17040_chip *chip = i2c_get_clientdata(client); | |
257 | ||
258 | cancel_delayed_work(&chip->work); | |
259 | return 0; | |
260 | } | |
261 | ||
262 | static int max17040_resume(struct i2c_client *client) | |
263 | { | |
264 | struct max17040_chip *chip = i2c_get_clientdata(client); | |
265 | ||
266 | schedule_delayed_work(&chip->work, MAX17040_DELAY); | |
267 | return 0; | |
268 | } | |
269 | ||
270 | #else | |
271 | ||
272 | #define max17040_suspend NULL | |
273 | #define max17040_resume NULL | |
274 | ||
275 | #endif /* CONFIG_PM */ | |
276 | ||
277 | static const struct i2c_device_id max17040_id[] = { | |
278 | { "max17040", 0 }, | |
279 | { } | |
280 | }; | |
281 | MODULE_DEVICE_TABLE(i2c, max17040_id); | |
282 | ||
283 | static struct i2c_driver max17040_i2c_driver = { | |
284 | .driver = { | |
285 | .name = "max17040", | |
286 | }, | |
287 | .probe = max17040_probe, | |
288 | .remove = __devexit_p(max17040_remove), | |
289 | .suspend = max17040_suspend, | |
290 | .resume = max17040_resume, | |
291 | .id_table = max17040_id, | |
292 | }; | |
5ff92e7a | 293 | module_i2c_driver(max17040_i2c_driver); |
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294 | |
295 | MODULE_AUTHOR("Minkyu Kang <mk7.kang@samsung.com>"); | |
296 | MODULE_DESCRIPTION("MAX17040 Fuel Gauge"); | |
297 | MODULE_LICENSE("GPL"); |