Commit | Line | Data |
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fb972873 DW |
1 | /* |
2 | * Battery driver for One Laptop Per Child board. | |
3 | * | |
4 | * Copyright © 2006 David Woodhouse <dwmw2@infradead.org> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | ||
11 | #include <linux/module.h> | |
12 | #include <linux/err.h> | |
13 | #include <linux/platform_device.h> | |
14 | #include <linux/power_supply.h> | |
15 | #include <linux/jiffies.h> | |
16 | #include <linux/sched.h> | |
17 | #include <asm/olpc.h> | |
18 | ||
19 | ||
20 | #define EC_BAT_VOLTAGE 0x10 /* uint16_t, *9.76/32, mV */ | |
21 | #define EC_BAT_CURRENT 0x11 /* int16_t, *15.625/120, mA */ | |
22 | #define EC_BAT_ACR 0x12 | |
23 | #define EC_BAT_TEMP 0x13 /* uint16_t, *100/256, °C */ | |
24 | #define EC_AMB_TEMP 0x14 /* uint16_t, *100/256, °C */ | |
25 | #define EC_BAT_STATUS 0x15 /* uint8_t, bitmask */ | |
26 | #define EC_BAT_SOC 0x16 /* uint8_t, percentage */ | |
27 | #define EC_BAT_SERIAL 0x17 /* uint8_t[6] */ | |
28 | #define EC_BAT_EEPROM 0x18 /* uint8_t adr as input, uint8_t output */ | |
29 | #define EC_BAT_ERRCODE 0x1f /* uint8_t, bitmask */ | |
30 | ||
31 | #define BAT_STAT_PRESENT 0x01 | |
32 | #define BAT_STAT_FULL 0x02 | |
33 | #define BAT_STAT_LOW 0x04 | |
34 | #define BAT_STAT_DESTROY 0x08 | |
35 | #define BAT_STAT_AC 0x10 | |
36 | #define BAT_STAT_CHARGING 0x20 | |
37 | #define BAT_STAT_DISCHARGING 0x40 | |
38 | ||
39 | #define BAT_ERR_INFOFAIL 0x02 | |
40 | #define BAT_ERR_OVERVOLTAGE 0x04 | |
41 | #define BAT_ERR_OVERTEMP 0x05 | |
42 | #define BAT_ERR_GAUGESTOP 0x06 | |
43 | #define BAT_ERR_OUT_OF_CONTROL 0x07 | |
44 | #define BAT_ERR_ID_FAIL 0x09 | |
45 | #define BAT_ERR_ACR_FAIL 0x10 | |
46 | ||
47 | #define BAT_ADDR_MFR_TYPE 0x5F | |
48 | ||
49 | /********************************************************************* | |
50 | * Power | |
51 | *********************************************************************/ | |
52 | ||
53 | static int olpc_ac_get_prop(struct power_supply *psy, | |
54 | enum power_supply_property psp, | |
55 | union power_supply_propval *val) | |
56 | { | |
57 | int ret = 0; | |
58 | uint8_t status; | |
59 | ||
60 | switch (psp) { | |
61 | case POWER_SUPPLY_PROP_ONLINE: | |
62 | ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1); | |
63 | if (ret) | |
64 | return ret; | |
65 | ||
66 | val->intval = !!(status & BAT_STAT_AC); | |
67 | break; | |
68 | default: | |
69 | ret = -EINVAL; | |
70 | break; | |
71 | } | |
72 | return ret; | |
73 | } | |
74 | ||
75 | static enum power_supply_property olpc_ac_props[] = { | |
76 | POWER_SUPPLY_PROP_ONLINE, | |
77 | }; | |
78 | ||
79 | static struct power_supply olpc_ac = { | |
80 | .name = "olpc-ac", | |
81 | .type = POWER_SUPPLY_TYPE_MAINS, | |
82 | .properties = olpc_ac_props, | |
83 | .num_properties = ARRAY_SIZE(olpc_ac_props), | |
84 | .get_property = olpc_ac_get_prop, | |
85 | }; | |
86 | ||
87 | /********************************************************************* | |
88 | * Battery properties | |
89 | *********************************************************************/ | |
90 | static int olpc_bat_get_property(struct power_supply *psy, | |
91 | enum power_supply_property psp, | |
92 | union power_supply_propval *val) | |
93 | { | |
94 | int ret = 0; | |
95 | int16_t ec_word; | |
96 | uint8_t ec_byte; | |
97 | ||
98 | ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &ec_byte, 1); | |
99 | if (ret) | |
100 | return ret; | |
101 | ||
102 | /* Theoretically there's a race here -- the battery could be | |
103 | removed immediately after we check whether it's present, and | |
104 | then we query for some other property of the now-absent battery. | |
105 | It doesn't matter though -- the EC will return the last-known | |
106 | information, and it's as if we just ran that _little_ bit faster | |
107 | and managed to read it out before the battery went away. */ | |
108 | if (!(ec_byte & BAT_STAT_PRESENT) && psp != POWER_SUPPLY_PROP_PRESENT) | |
109 | return -ENODEV; | |
110 | ||
111 | switch (psp) { | |
112 | case POWER_SUPPLY_PROP_STATUS: | |
113 | if (olpc_platform_info.ecver > 0x44) { | |
114 | if (ec_byte & BAT_STAT_CHARGING) | |
115 | val->intval = POWER_SUPPLY_STATUS_CHARGING; | |
116 | else if (ec_byte & BAT_STAT_DISCHARGING) | |
117 | val->intval = POWER_SUPPLY_STATUS_DISCHARGING; | |
118 | else if (ec_byte & BAT_STAT_FULL) | |
119 | val->intval = POWER_SUPPLY_STATUS_FULL; | |
120 | else /* er,... */ | |
121 | val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; | |
122 | } else { | |
123 | /* Older EC didn't report charge/discharge bits */ | |
124 | if (!(ec_byte & BAT_STAT_AC)) /* No AC means discharging */ | |
125 | val->intval = POWER_SUPPLY_STATUS_DISCHARGING; | |
126 | else if (ec_byte & BAT_STAT_FULL) | |
127 | val->intval = POWER_SUPPLY_STATUS_FULL; | |
128 | else /* Not _necessarily_ true but EC doesn't tell all yet */ | |
129 | val->intval = POWER_SUPPLY_STATUS_CHARGING; | |
130 | break; | |
131 | } | |
132 | case POWER_SUPPLY_PROP_PRESENT: | |
133 | val->intval = !!(ec_byte & BAT_STAT_PRESENT); | |
134 | break; | |
135 | ||
136 | case POWER_SUPPLY_PROP_HEALTH: | |
137 | if (ec_byte & BAT_STAT_DESTROY) | |
138 | val->intval = POWER_SUPPLY_HEALTH_DEAD; | |
139 | else { | |
140 | ret = olpc_ec_cmd(EC_BAT_ERRCODE, NULL, 0, &ec_byte, 1); | |
141 | if (ret) | |
142 | return ret; | |
143 | ||
144 | switch (ec_byte) { | |
145 | case 0: | |
146 | val->intval = POWER_SUPPLY_HEALTH_GOOD; | |
147 | break; | |
148 | ||
149 | case BAT_ERR_OVERTEMP: | |
150 | val->intval = POWER_SUPPLY_HEALTH_OVERHEAT; | |
151 | break; | |
152 | ||
153 | case BAT_ERR_OVERVOLTAGE: | |
154 | val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE; | |
155 | break; | |
156 | ||
157 | case BAT_ERR_INFOFAIL: | |
158 | case BAT_ERR_OUT_OF_CONTROL: | |
159 | case BAT_ERR_ID_FAIL: | |
160 | case BAT_ERR_ACR_FAIL: | |
161 | val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; | |
162 | break; | |
163 | ||
164 | default: | |
165 | /* Eep. We don't know this failure code */ | |
166 | return -EIO; | |
167 | } | |
168 | } | |
169 | break; | |
170 | ||
171 | case POWER_SUPPLY_PROP_MANUFACTURER: | |
172 | ec_byte = BAT_ADDR_MFR_TYPE; | |
173 | ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1); | |
174 | if (ret) | |
175 | return ret; | |
176 | ||
177 | switch (ec_byte >> 4) { | |
178 | case 1: | |
179 | val->strval = "Gold Peak"; | |
180 | break; | |
181 | case 2: | |
182 | val->strval = "BYD"; | |
183 | break; | |
184 | default: | |
185 | val->strval = "Unknown"; | |
186 | break; | |
187 | } | |
188 | break; | |
189 | case POWER_SUPPLY_PROP_TECHNOLOGY: | |
190 | ec_byte = BAT_ADDR_MFR_TYPE; | |
191 | ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1); | |
192 | if (ret) | |
193 | return ret; | |
194 | ||
195 | switch (ec_byte & 0xf) { | |
196 | case 1: | |
197 | val->intval = POWER_SUPPLY_TECHNOLOGY_NiMH; | |
198 | break; | |
199 | case 2: | |
200 | val->intval = POWER_SUPPLY_TECHNOLOGY_LiFe; | |
201 | break; | |
202 | default: | |
203 | val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN; | |
204 | break; | |
205 | } | |
206 | break; | |
207 | case POWER_SUPPLY_PROP_VOLTAGE_AVG: | |
208 | ret = olpc_ec_cmd(EC_BAT_VOLTAGE, NULL, 0, (void *)&ec_word, 2); | |
209 | if (ret) | |
210 | return ret; | |
211 | ||
212 | ec_word = be16_to_cpu(ec_word); | |
213 | val->intval = ec_word * 9760L / 32; | |
214 | break; | |
215 | case POWER_SUPPLY_PROP_CURRENT_AVG: | |
216 | ret = olpc_ec_cmd(EC_BAT_CURRENT, NULL, 0, (void *)&ec_word, 2); | |
217 | if (ret) | |
218 | return ret; | |
219 | ||
220 | ec_word = be16_to_cpu(ec_word); | |
221 | val->intval = ec_word * 15625L / 120; | |
222 | break; | |
223 | case POWER_SUPPLY_PROP_CAPACITY: | |
224 | ret = olpc_ec_cmd(EC_BAT_SOC, NULL, 0, &ec_byte, 1); | |
225 | if (ret) | |
226 | return ret; | |
227 | val->intval = ec_byte; | |
228 | break; | |
fb972873 DW |
229 | case POWER_SUPPLY_PROP_TEMP: |
230 | ret = olpc_ec_cmd(EC_BAT_TEMP, NULL, 0, (void *)&ec_word, 2); | |
231 | if (ret) | |
232 | return ret; | |
233 | ec_word = be16_to_cpu(ec_word); | |
234 | val->intval = ec_word * 100 / 256; | |
235 | break; | |
236 | case POWER_SUPPLY_PROP_TEMP_AMBIENT: | |
237 | ret = olpc_ec_cmd(EC_AMB_TEMP, NULL, 0, (void *)&ec_word, 2); | |
238 | if (ret) | |
239 | return ret; | |
240 | ||
241 | ec_word = be16_to_cpu(ec_word); | |
242 | val->intval = ec_word * 100 / 256; | |
243 | break; | |
244 | default: | |
245 | ret = -EINVAL; | |
246 | break; | |
247 | } | |
248 | ||
249 | return ret; | |
250 | } | |
251 | ||
252 | static enum power_supply_property olpc_bat_props[] = { | |
253 | POWER_SUPPLY_PROP_STATUS, | |
254 | POWER_SUPPLY_PROP_PRESENT, | |
255 | POWER_SUPPLY_PROP_HEALTH, | |
256 | POWER_SUPPLY_PROP_TECHNOLOGY, | |
257 | POWER_SUPPLY_PROP_VOLTAGE_AVG, | |
258 | POWER_SUPPLY_PROP_CURRENT_AVG, | |
259 | POWER_SUPPLY_PROP_CAPACITY, | |
fb972873 DW |
260 | POWER_SUPPLY_PROP_TEMP, |
261 | POWER_SUPPLY_PROP_TEMP_AMBIENT, | |
262 | POWER_SUPPLY_PROP_MANUFACTURER, | |
263 | }; | |
264 | ||
265 | /********************************************************************* | |
266 | * Initialisation | |
267 | *********************************************************************/ | |
268 | ||
269 | static struct platform_device *bat_pdev; | |
270 | ||
271 | static struct power_supply olpc_bat = { | |
272 | .properties = olpc_bat_props, | |
273 | .num_properties = ARRAY_SIZE(olpc_bat_props), | |
274 | .get_property = olpc_bat_get_property, | |
275 | .use_for_apm = 1, | |
276 | }; | |
277 | ||
278 | void olpc_battery_trigger_uevent(unsigned long cause) | |
279 | { | |
280 | if (cause & EC_SCI_SRC_ACPWR) | |
281 | kobject_uevent(&olpc_ac.dev->kobj, KOBJ_CHANGE); | |
282 | if (cause & (EC_SCI_SRC_BATERR|EC_SCI_SRC_BATSOC|EC_SCI_SRC_BATTERY)) | |
283 | kobject_uevent(&olpc_bat.dev->kobj, KOBJ_CHANGE); | |
284 | } | |
285 | ||
286 | static int __init olpc_bat_init(void) | |
287 | { | |
288 | int ret = 0; | |
289 | uint8_t status; | |
290 | ||
291 | if (!olpc_platform_info.ecver) | |
292 | return -ENXIO; | |
293 | if (olpc_platform_info.ecver < 0x43) { | |
294 | printk(KERN_NOTICE "OLPC EC version 0x%02x too old for battery driver.\n", olpc_platform_info.ecver); | |
295 | return -ENXIO; | |
296 | } | |
297 | ||
298 | ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1); | |
299 | if (ret) | |
300 | return ret; | |
301 | ||
302 | /* Ignore the status. It doesn't actually matter */ | |
303 | ||
304 | bat_pdev = platform_device_register_simple("olpc-battery", 0, NULL, 0); | |
305 | if (IS_ERR(bat_pdev)) | |
306 | return PTR_ERR(bat_pdev); | |
307 | ||
308 | ret = power_supply_register(&bat_pdev->dev, &olpc_ac); | |
309 | if (ret) | |
310 | goto ac_failed; | |
311 | ||
312 | olpc_bat.name = bat_pdev->name; | |
313 | ||
314 | ret = power_supply_register(&bat_pdev->dev, &olpc_bat); | |
315 | if (ret) | |
316 | goto battery_failed; | |
317 | ||
fb972873 DW |
318 | goto success; |
319 | ||
320 | battery_failed: | |
321 | power_supply_unregister(&olpc_ac); | |
322 | ac_failed: | |
323 | platform_device_unregister(bat_pdev); | |
324 | success: | |
325 | return ret; | |
326 | } | |
327 | ||
328 | static void __exit olpc_bat_exit(void) | |
329 | { | |
fb972873 DW |
330 | power_supply_unregister(&olpc_bat); |
331 | power_supply_unregister(&olpc_ac); | |
332 | platform_device_unregister(bat_pdev); | |
fb972873 DW |
333 | } |
334 | ||
335 | module_init(olpc_bat_init); | |
336 | module_exit(olpc_bat_exit); | |
337 | ||
338 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); | |
339 | MODULE_LICENSE("GPL"); | |
340 | MODULE_DESCRIPTION("Battery driver for One Laptop Per Child 'XO' machine"); |