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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 | ||
1ca5b9d2 DW |
87 | static char bat_serial[17]; /* Ick */ |
88 | ||
fb972873 DW |
89 | /********************************************************************* |
90 | * Battery properties | |
91 | *********************************************************************/ | |
92 | static int olpc_bat_get_property(struct power_supply *psy, | |
93 | enum power_supply_property psp, | |
94 | union power_supply_propval *val) | |
95 | { | |
96 | int ret = 0; | |
97 | int16_t ec_word; | |
98 | uint8_t ec_byte; | |
1ca5b9d2 | 99 | uint64_t ser_buf; |
fb972873 DW |
100 | |
101 | ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &ec_byte, 1); | |
102 | if (ret) | |
103 | return ret; | |
104 | ||
105 | /* Theoretically there's a race here -- the battery could be | |
106 | removed immediately after we check whether it's present, and | |
107 | then we query for some other property of the now-absent battery. | |
108 | It doesn't matter though -- the EC will return the last-known | |
109 | information, and it's as if we just ran that _little_ bit faster | |
110 | and managed to read it out before the battery went away. */ | |
111 | if (!(ec_byte & BAT_STAT_PRESENT) && psp != POWER_SUPPLY_PROP_PRESENT) | |
112 | return -ENODEV; | |
113 | ||
114 | switch (psp) { | |
115 | case POWER_SUPPLY_PROP_STATUS: | |
116 | if (olpc_platform_info.ecver > 0x44) { | |
117 | if (ec_byte & BAT_STAT_CHARGING) | |
118 | val->intval = POWER_SUPPLY_STATUS_CHARGING; | |
119 | else if (ec_byte & BAT_STAT_DISCHARGING) | |
120 | val->intval = POWER_SUPPLY_STATUS_DISCHARGING; | |
121 | else if (ec_byte & BAT_STAT_FULL) | |
122 | val->intval = POWER_SUPPLY_STATUS_FULL; | |
123 | else /* er,... */ | |
124 | val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; | |
125 | } else { | |
126 | /* Older EC didn't report charge/discharge bits */ | |
127 | if (!(ec_byte & BAT_STAT_AC)) /* No AC means discharging */ | |
128 | val->intval = POWER_SUPPLY_STATUS_DISCHARGING; | |
129 | else if (ec_byte & BAT_STAT_FULL) | |
130 | val->intval = POWER_SUPPLY_STATUS_FULL; | |
131 | else /* Not _necessarily_ true but EC doesn't tell all yet */ | |
132 | val->intval = POWER_SUPPLY_STATUS_CHARGING; | |
133 | break; | |
134 | } | |
135 | case POWER_SUPPLY_PROP_PRESENT: | |
136 | val->intval = !!(ec_byte & BAT_STAT_PRESENT); | |
137 | break; | |
138 | ||
139 | case POWER_SUPPLY_PROP_HEALTH: | |
140 | if (ec_byte & BAT_STAT_DESTROY) | |
141 | val->intval = POWER_SUPPLY_HEALTH_DEAD; | |
142 | else { | |
143 | ret = olpc_ec_cmd(EC_BAT_ERRCODE, NULL, 0, &ec_byte, 1); | |
144 | if (ret) | |
145 | return ret; | |
146 | ||
147 | switch (ec_byte) { | |
148 | case 0: | |
149 | val->intval = POWER_SUPPLY_HEALTH_GOOD; | |
150 | break; | |
151 | ||
152 | case BAT_ERR_OVERTEMP: | |
153 | val->intval = POWER_SUPPLY_HEALTH_OVERHEAT; | |
154 | break; | |
155 | ||
156 | case BAT_ERR_OVERVOLTAGE: | |
157 | val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE; | |
158 | break; | |
159 | ||
160 | case BAT_ERR_INFOFAIL: | |
161 | case BAT_ERR_OUT_OF_CONTROL: | |
162 | case BAT_ERR_ID_FAIL: | |
163 | case BAT_ERR_ACR_FAIL: | |
164 | val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; | |
165 | break; | |
166 | ||
167 | default: | |
168 | /* Eep. We don't know this failure code */ | |
169 | return -EIO; | |
170 | } | |
171 | } | |
172 | break; | |
173 | ||
174 | case POWER_SUPPLY_PROP_MANUFACTURER: | |
175 | ec_byte = BAT_ADDR_MFR_TYPE; | |
176 | ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1); | |
177 | if (ret) | |
178 | return ret; | |
179 | ||
180 | switch (ec_byte >> 4) { | |
181 | case 1: | |
182 | val->strval = "Gold Peak"; | |
183 | break; | |
184 | case 2: | |
185 | val->strval = "BYD"; | |
186 | break; | |
187 | default: | |
188 | val->strval = "Unknown"; | |
189 | break; | |
190 | } | |
191 | break; | |
192 | case POWER_SUPPLY_PROP_TECHNOLOGY: | |
193 | ec_byte = BAT_ADDR_MFR_TYPE; | |
194 | ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1); | |
195 | if (ret) | |
196 | return ret; | |
197 | ||
198 | switch (ec_byte & 0xf) { | |
199 | case 1: | |
200 | val->intval = POWER_SUPPLY_TECHNOLOGY_NiMH; | |
201 | break; | |
202 | case 2: | |
203 | val->intval = POWER_SUPPLY_TECHNOLOGY_LiFe; | |
204 | break; | |
205 | default: | |
206 | val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN; | |
207 | break; | |
208 | } | |
209 | break; | |
210 | case POWER_SUPPLY_PROP_VOLTAGE_AVG: | |
211 | ret = olpc_ec_cmd(EC_BAT_VOLTAGE, NULL, 0, (void *)&ec_word, 2); | |
212 | if (ret) | |
213 | return ret; | |
214 | ||
215 | ec_word = be16_to_cpu(ec_word); | |
216 | val->intval = ec_word * 9760L / 32; | |
217 | break; | |
218 | case POWER_SUPPLY_PROP_CURRENT_AVG: | |
219 | ret = olpc_ec_cmd(EC_BAT_CURRENT, NULL, 0, (void *)&ec_word, 2); | |
220 | if (ret) | |
221 | return ret; | |
222 | ||
223 | ec_word = be16_to_cpu(ec_word); | |
224 | val->intval = ec_word * 15625L / 120; | |
225 | break; | |
226 | case POWER_SUPPLY_PROP_CAPACITY: | |
227 | ret = olpc_ec_cmd(EC_BAT_SOC, NULL, 0, &ec_byte, 1); | |
228 | if (ret) | |
229 | return ret; | |
230 | val->intval = ec_byte; | |
231 | break; | |
fb972873 DW |
232 | case POWER_SUPPLY_PROP_TEMP: |
233 | ret = olpc_ec_cmd(EC_BAT_TEMP, NULL, 0, (void *)&ec_word, 2); | |
234 | if (ret) | |
235 | return ret; | |
236 | ec_word = be16_to_cpu(ec_word); | |
237 | val->intval = ec_word * 100 / 256; | |
238 | break; | |
239 | case POWER_SUPPLY_PROP_TEMP_AMBIENT: | |
240 | ret = olpc_ec_cmd(EC_AMB_TEMP, NULL, 0, (void *)&ec_word, 2); | |
241 | if (ret) | |
242 | return ret; | |
243 | ||
244 | ec_word = be16_to_cpu(ec_word); | |
245 | val->intval = ec_word * 100 / 256; | |
246 | break; | |
1ca5b9d2 DW |
247 | case POWER_SUPPLY_PROP_SERIAL_NUMBER: |
248 | ret = olpc_ec_cmd(EC_BAT_SERIAL, NULL, 0, (void *)&ser_buf, 8); | |
249 | if (ret) | |
250 | return ret; | |
251 | ||
252 | sprintf(bat_serial, "%016llx", (long long)be64_to_cpu(ser_buf)); | |
253 | val->strval = bat_serial; | |
254 | break; | |
fb972873 DW |
255 | default: |
256 | ret = -EINVAL; | |
257 | break; | |
258 | } | |
259 | ||
260 | return ret; | |
261 | } | |
262 | ||
263 | static enum power_supply_property olpc_bat_props[] = { | |
264 | POWER_SUPPLY_PROP_STATUS, | |
265 | POWER_SUPPLY_PROP_PRESENT, | |
266 | POWER_SUPPLY_PROP_HEALTH, | |
267 | POWER_SUPPLY_PROP_TECHNOLOGY, | |
268 | POWER_SUPPLY_PROP_VOLTAGE_AVG, | |
269 | POWER_SUPPLY_PROP_CURRENT_AVG, | |
270 | POWER_SUPPLY_PROP_CAPACITY, | |
fb972873 DW |
271 | POWER_SUPPLY_PROP_TEMP, |
272 | POWER_SUPPLY_PROP_TEMP_AMBIENT, | |
273 | POWER_SUPPLY_PROP_MANUFACTURER, | |
1ca5b9d2 | 274 | POWER_SUPPLY_PROP_SERIAL_NUMBER, |
fb972873 DW |
275 | }; |
276 | ||
277 | /********************************************************************* | |
278 | * Initialisation | |
279 | *********************************************************************/ | |
280 | ||
281 | static struct platform_device *bat_pdev; | |
282 | ||
283 | static struct power_supply olpc_bat = { | |
284 | .properties = olpc_bat_props, | |
285 | .num_properties = ARRAY_SIZE(olpc_bat_props), | |
286 | .get_property = olpc_bat_get_property, | |
287 | .use_for_apm = 1, | |
288 | }; | |
289 | ||
290 | void olpc_battery_trigger_uevent(unsigned long cause) | |
291 | { | |
292 | if (cause & EC_SCI_SRC_ACPWR) | |
293 | kobject_uevent(&olpc_ac.dev->kobj, KOBJ_CHANGE); | |
294 | if (cause & (EC_SCI_SRC_BATERR|EC_SCI_SRC_BATSOC|EC_SCI_SRC_BATTERY)) | |
295 | kobject_uevent(&olpc_bat.dev->kobj, KOBJ_CHANGE); | |
296 | } | |
297 | ||
298 | static int __init olpc_bat_init(void) | |
299 | { | |
300 | int ret = 0; | |
301 | uint8_t status; | |
302 | ||
303 | if (!olpc_platform_info.ecver) | |
304 | return -ENXIO; | |
305 | if (olpc_platform_info.ecver < 0x43) { | |
306 | printk(KERN_NOTICE "OLPC EC version 0x%02x too old for battery driver.\n", olpc_platform_info.ecver); | |
307 | return -ENXIO; | |
308 | } | |
309 | ||
310 | ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1); | |
311 | if (ret) | |
312 | return ret; | |
313 | ||
314 | /* Ignore the status. It doesn't actually matter */ | |
315 | ||
316 | bat_pdev = platform_device_register_simple("olpc-battery", 0, NULL, 0); | |
317 | if (IS_ERR(bat_pdev)) | |
318 | return PTR_ERR(bat_pdev); | |
319 | ||
320 | ret = power_supply_register(&bat_pdev->dev, &olpc_ac); | |
321 | if (ret) | |
322 | goto ac_failed; | |
323 | ||
324 | olpc_bat.name = bat_pdev->name; | |
325 | ||
326 | ret = power_supply_register(&bat_pdev->dev, &olpc_bat); | |
327 | if (ret) | |
328 | goto battery_failed; | |
329 | ||
fb972873 DW |
330 | goto success; |
331 | ||
332 | battery_failed: | |
333 | power_supply_unregister(&olpc_ac); | |
334 | ac_failed: | |
335 | platform_device_unregister(bat_pdev); | |
336 | success: | |
337 | return ret; | |
338 | } | |
339 | ||
340 | static void __exit olpc_bat_exit(void) | |
341 | { | |
fb972873 DW |
342 | power_supply_unregister(&olpc_bat); |
343 | power_supply_unregister(&olpc_ac); | |
344 | platform_device_unregister(bat_pdev); | |
fb972873 DW |
345 | } |
346 | ||
347 | module_init(olpc_bat_init); | |
348 | module_exit(olpc_bat_exit); | |
349 | ||
350 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); | |
351 | MODULE_LICENSE("GPL"); | |
352 | MODULE_DESCRIPTION("Battery driver for One Laptop Per Child 'XO' machine"); |