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Linux 2.6.33-rc6
[cris-mirror.git] / drivers / power / pcf50633-charger.c
blobea3fdfaca90dd70cd31815d4fdc23901414f0b4c
1 /* NXP PCF50633 Main Battery Charger Driver
2 *
3 * (C) 2006-2008 by Openmoko, Inc.
4 * Author: Balaji Rao <balajirrao@openmoko.org>
5 * All rights reserved.
6 *
7 * Broken down from monstrous PCF50633 driver mainly by
8 * Harald Welte, Andy Green and Werner Almesberger
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation; either version 2 of the License, or (at your
13 * option) any later version.
14 *
15 */
16
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/types.h>
21 #include <linux/device.h>
22 #include <linux/sysfs.h>
23 #include <linux/platform_device.h>
24 #include <linux/power_supply.h>
25
26 #include <linux/mfd/pcf50633/core.h>
27 #include <linux/mfd/pcf50633/mbc.h>
28
29 struct pcf50633_mbc {
30 struct pcf50633 *pcf;
31
32 int adapter_online;
33 int usb_online;
34
35 struct power_supply usb;
36 struct power_supply adapter;
37 struct power_supply ac;
38 };
39
40 int pcf50633_mbc_usb_curlim_set(struct pcf50633 *pcf, int ma)
41 {
42 struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev);
43 int ret = 0;
44 u8 bits;
45 int charging_start = 1;
46 u8 mbcs2, chgmod;
47 unsigned int mbcc5;
48
49 if (ma >= 1000) {
50 bits = PCF50633_MBCC7_USB_1000mA;
51 ma = 1000;
52 } else if (ma >= 500) {
53 bits = PCF50633_MBCC7_USB_500mA;
54 ma = 500;
55 } else if (ma >= 100) {
56 bits = PCF50633_MBCC7_USB_100mA;
57 ma = 100;
58 } else {
59 bits = PCF50633_MBCC7_USB_SUSPEND;
60 charging_start = 0;
61 ma = 0;
62 }
63
64 ret = pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC7,
65 PCF50633_MBCC7_USB_MASK, bits);
66 if (ret)
67 dev_err(pcf->dev, "error setting usb curlim to %d mA\n", ma);
68 else
69 dev_info(pcf->dev, "usb curlim to %d mA\n", ma);
70
71 /*
72 * We limit the charging current to be the USB current limit.
73 * The reason is that on pcf50633, when it enters PMU Standby mode,
74 * which it does when the device goes "off", the USB current limit
75 * reverts to the variant default. In at least one common case, that
76 * default is 500mA. By setting the charging current to be the same
77 * as the USB limit we set here before PMU standby, we enforce it only
78 * using the correct amount of current even when the USB current limit
79 * gets reset to the wrong thing
80 */
81
82 if (mbc->pcf->pdata->charger_reference_current_ma) {
83 mbcc5 = (ma << 8) / mbc->pcf->pdata->charger_reference_current_ma;
84 if (mbcc5 > 255)
85 mbcc5 = 255;
86 pcf50633_reg_write(mbc->pcf, PCF50633_REG_MBCC5, mbcc5);
87 }
88
89 mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2);
90 chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK);
91
92 /* If chgmod == BATFULL, setting chgena has no effect.
93 * Datasheet says we need to set resume instead but when autoresume is
94 * used resume doesn't work. Clear and set chgena instead.
95 */
96 if (chgmod != PCF50633_MBCS2_MBC_BAT_FULL)
97 pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC1,
98 PCF50633_MBCC1_CHGENA, PCF50633_MBCC1_CHGENA);
99 else {
100 pcf50633_reg_clear_bits(pcf, PCF50633_REG_MBCC1,
101 PCF50633_MBCC1_CHGENA);
102 pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC1,
103 PCF50633_MBCC1_CHGENA, PCF50633_MBCC1_CHGENA);
104 }
105
106 power_supply_changed(&mbc->usb);
107
108 return ret;
109 }
110 EXPORT_SYMBOL_GPL(pcf50633_mbc_usb_curlim_set);
111
112 int pcf50633_mbc_get_status(struct pcf50633 *pcf)
113 {
114 struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev);
115 int status = 0;
116 u8 chgmod;
117
118 if (!mbc)
119 return 0;
120
121 chgmod = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2)
122 & PCF50633_MBCS2_MBC_MASK;
123
124 if (mbc->usb_online)
125 status |= PCF50633_MBC_USB_ONLINE;
126 if (chgmod == PCF50633_MBCS2_MBC_USB_PRE ||
127 chgmod == PCF50633_MBCS2_MBC_USB_PRE_WAIT ||
128 chgmod == PCF50633_MBCS2_MBC_USB_FAST ||
129 chgmod == PCF50633_MBCS2_MBC_USB_FAST_WAIT)
130 status |= PCF50633_MBC_USB_ACTIVE;
131 if (mbc->adapter_online)
132 status |= PCF50633_MBC_ADAPTER_ONLINE;
133 if (chgmod == PCF50633_MBCS2_MBC_ADP_PRE ||
134 chgmod == PCF50633_MBCS2_MBC_ADP_PRE_WAIT ||
135 chgmod == PCF50633_MBCS2_MBC_ADP_FAST ||
136 chgmod == PCF50633_MBCS2_MBC_ADP_FAST_WAIT)
137 status |= PCF50633_MBC_ADAPTER_ACTIVE;
138
139 return status;
140 }
141 EXPORT_SYMBOL_GPL(pcf50633_mbc_get_status);
142
143 int pcf50633_mbc_get_usb_online_status(struct pcf50633 *pcf)
144 {
145 struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev);
146
147 if (!mbc)
148 return 0;
149
150 return mbc->usb_online;
151 }
152 EXPORT_SYMBOL_GPL(pcf50633_mbc_get_usb_online_status);
153
154 static ssize_t
155 show_chgmode(struct device *dev, struct device_attribute *attr, char *buf)
156 {
157 struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
158
159 u8 mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2);
160 u8 chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK);
161
162 return sprintf(buf, "%d\n", chgmod);
163 }
164 static DEVICE_ATTR(chgmode, S_IRUGO, show_chgmode, NULL);
165
166 static ssize_t
167 show_usblim(struct device *dev, struct device_attribute *attr, char *buf)
168 {
169 struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
170 u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
171 PCF50633_MBCC7_USB_MASK;
172 unsigned int ma;
173
174 if (usblim == PCF50633_MBCC7_USB_1000mA)
175 ma = 1000;
176 else if (usblim == PCF50633_MBCC7_USB_500mA)
177 ma = 500;
178 else if (usblim == PCF50633_MBCC7_USB_100mA)
179 ma = 100;
180 else
181 ma = 0;
182
183 return sprintf(buf, "%u\n", ma);
184 }
185
186 static ssize_t set_usblim(struct device *dev,
187 struct device_attribute *attr, const char *buf, size_t count)
188 {
189 struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
190 unsigned long ma;
191 int ret;
192
193 ret = strict_strtoul(buf, 10, &ma);
194 if (ret)
195 return -EINVAL;
196
197 pcf50633_mbc_usb_curlim_set(mbc->pcf, ma);
198
199 return count;
200 }
201
202 static DEVICE_ATTR(usb_curlim, S_IRUGO | S_IWUSR, show_usblim, set_usblim);
203
204 static ssize_t
205 show_chglim(struct device *dev, struct device_attribute *attr, char *buf)
206 {
207 struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
208 u8 mbcc5 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC5);
209 unsigned int ma;
210
211 if (!mbc->pcf->pdata->charger_reference_current_ma)
212 return -ENODEV;
213
214 ma = (mbc->pcf->pdata->charger_reference_current_ma * mbcc5) >> 8;
215
216 return sprintf(buf, "%u\n", ma);
217 }
218
219 static ssize_t set_chglim(struct device *dev,
220 struct device_attribute *attr, const char *buf, size_t count)
221 {
222 struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
223 unsigned long ma;
224 unsigned int mbcc5;
225 int ret;
226
227 if (!mbc->pcf->pdata->charger_reference_current_ma)
228 return -ENODEV;
229
230 ret = strict_strtoul(buf, 10, &ma);
231 if (ret)
232 return -EINVAL;
233
234 mbcc5 = (ma << 8) / mbc->pcf->pdata->charger_reference_current_ma;
235 if (mbcc5 > 255)
236 mbcc5 = 255;
237 pcf50633_reg_write(mbc->pcf, PCF50633_REG_MBCC5, mbcc5);
238
239 return count;
240 }
241
242 /*
243 * This attribute allows to change MBC charging limit on the fly
244 * independently of usb current limit. It also gets set automatically every
245 * time usb current limit is changed.
246 */
247 static DEVICE_ATTR(chg_curlim, S_IRUGO | S_IWUSR, show_chglim, set_chglim);
248
249 static struct attribute *pcf50633_mbc_sysfs_entries[] = {
250 &dev_attr_chgmode.attr,
251 &dev_attr_usb_curlim.attr,
252 &dev_attr_chg_curlim.attr,
253 NULL,
254 };
255
256 static struct attribute_group mbc_attr_group = {
257 .name = NULL, /* put in device directory */
258 .attrs = pcf50633_mbc_sysfs_entries,
259 };
260
261 static void
262 pcf50633_mbc_irq_handler(int irq, void *data)
263 {
264 struct pcf50633_mbc *mbc = data;
265
266 /* USB */
267 if (irq == PCF50633_IRQ_USBINS) {
268 mbc->usb_online = 1;
269 } else if (irq == PCF50633_IRQ_USBREM) {
270 mbc->usb_online = 0;
271 pcf50633_mbc_usb_curlim_set(mbc->pcf, 0);
272 }
273
274 /* Adapter */
275 if (irq == PCF50633_IRQ_ADPINS)
276 mbc->adapter_online = 1;
277 else if (irq == PCF50633_IRQ_ADPREM)
278 mbc->adapter_online = 0;
279
280 power_supply_changed(&mbc->ac);
281 power_supply_changed(&mbc->usb);
282 power_supply_changed(&mbc->adapter);
283
284 if (mbc->pcf->pdata->mbc_event_callback)
285 mbc->pcf->pdata->mbc_event_callback(mbc->pcf, irq);
286 }
287
288 static int adapter_get_property(struct power_supply *psy,
289 enum power_supply_property psp,
290 union power_supply_propval *val)
291 {
292 struct pcf50633_mbc *mbc = container_of(psy,
293 struct pcf50633_mbc, adapter);
294 int ret = 0;
295
296 switch (psp) {
297 case POWER_SUPPLY_PROP_ONLINE:
298 val->intval = mbc->adapter_online;
299 break;
300 default:
301 ret = -EINVAL;
302 break;
303 }
304 return ret;
305 }
306
307 static int usb_get_property(struct power_supply *psy,
308 enum power_supply_property psp,
309 union power_supply_propval *val)
310 {
311 struct pcf50633_mbc *mbc = container_of(psy, struct pcf50633_mbc, usb);
312 int ret = 0;
313 u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
314 PCF50633_MBCC7_USB_MASK;
315
316 switch (psp) {
317 case POWER_SUPPLY_PROP_ONLINE:
318 val->intval = mbc->usb_online &&
319 (usblim <= PCF50633_MBCC7_USB_500mA);
320 break;
321 default:
322 ret = -EINVAL;
323 break;
324 }
325 return ret;
326 }
327
328 static int ac_get_property(struct power_supply *psy,
329 enum power_supply_property psp,
330 union power_supply_propval *val)
331 {
332 struct pcf50633_mbc *mbc = container_of(psy, struct pcf50633_mbc, ac);
333 int ret = 0;
334 u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
335 PCF50633_MBCC7_USB_MASK;
336
337 switch (psp) {
338 case POWER_SUPPLY_PROP_ONLINE:
339 val->intval = mbc->usb_online &&
340 (usblim == PCF50633_MBCC7_USB_1000mA);
341 break;
342 default:
343 ret = -EINVAL;
344 break;
345 }
346 return ret;
347 }
348
349 static enum power_supply_property power_props[] = {
350 POWER_SUPPLY_PROP_ONLINE,
351 };
352
353 static const u8 mbc_irq_handlers[] = {
354 PCF50633_IRQ_ADPINS,
355 PCF50633_IRQ_ADPREM,
356 PCF50633_IRQ_USBINS,
357 PCF50633_IRQ_USBREM,
358 PCF50633_IRQ_BATFULL,
359 PCF50633_IRQ_CHGHALT,
360 PCF50633_IRQ_THLIMON,
361 PCF50633_IRQ_THLIMOFF,
362 PCF50633_IRQ_USBLIMON,
363 PCF50633_IRQ_USBLIMOFF,
364 PCF50633_IRQ_LOWSYS,
365 PCF50633_IRQ_LOWBAT,
366 };
367
368 static int __devinit pcf50633_mbc_probe(struct platform_device *pdev)
369 {
370 struct pcf50633_mbc *mbc;
371 int ret;
372 int i;
373 u8 mbcs1;
374
375 mbc = kzalloc(sizeof(*mbc), GFP_KERNEL);
376 if (!mbc)
377 return -ENOMEM;
378
379 platform_set_drvdata(pdev, mbc);
380 mbc->pcf = dev_to_pcf50633(pdev->dev.parent);
381
382 /* Set up IRQ handlers */
383 for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++)
384 pcf50633_register_irq(mbc->pcf, mbc_irq_handlers[i],
385 pcf50633_mbc_irq_handler, mbc);
386
387 /* Create power supplies */
388 mbc->adapter.name = "adapter";
389 mbc->adapter.type = POWER_SUPPLY_TYPE_MAINS;
390 mbc->adapter.properties = power_props;
391 mbc->adapter.num_properties = ARRAY_SIZE(power_props);
392 mbc->adapter.get_property = &adapter_get_property;
393 mbc->adapter.supplied_to = mbc->pcf->pdata->batteries;
394 mbc->adapter.num_supplicants = mbc->pcf->pdata->num_batteries;
395
396 mbc->usb.name = "usb";
397 mbc->usb.type = POWER_SUPPLY_TYPE_USB;
398 mbc->usb.properties = power_props;
399 mbc->usb.num_properties = ARRAY_SIZE(power_props);
400 mbc->usb.get_property = usb_get_property;
401 mbc->usb.supplied_to = mbc->pcf->pdata->batteries;
402 mbc->usb.num_supplicants = mbc->pcf->pdata->num_batteries;
403
404 mbc->ac.name = "ac";
405 mbc->ac.type = POWER_SUPPLY_TYPE_MAINS;
406 mbc->ac.properties = power_props;
407 mbc->ac.num_properties = ARRAY_SIZE(power_props);
408 mbc->ac.get_property = ac_get_property;
409 mbc->ac.supplied_to = mbc->pcf->pdata->batteries;
410 mbc->ac.num_supplicants = mbc->pcf->pdata->num_batteries;
411
412 ret = power_supply_register(&pdev->dev, &mbc->adapter);
413 if (ret) {
414 dev_err(mbc->pcf->dev, "failed to register adapter\n");
415 kfree(mbc);
416 return ret;
417 }
418
419 ret = power_supply_register(&pdev->dev, &mbc->usb);
420 if (ret) {
421 dev_err(mbc->pcf->dev, "failed to register usb\n");
422 power_supply_unregister(&mbc->adapter);
423 kfree(mbc);
424 return ret;
425 }
426
427 ret = power_supply_register(&pdev->dev, &mbc->ac);
428 if (ret) {
429 dev_err(mbc->pcf->dev, "failed to register ac\n");
430 power_supply_unregister(&mbc->adapter);
431 power_supply_unregister(&mbc->usb);
432 kfree(mbc);
433 return ret;
434 }
435
436 ret = sysfs_create_group(&pdev->dev.kobj, &mbc_attr_group);
437 if (ret)
438 dev_err(mbc->pcf->dev, "failed to create sysfs entries\n");
439
440 mbcs1 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS1);
441 if (mbcs1 & PCF50633_MBCS1_USBPRES)
442 pcf50633_mbc_irq_handler(PCF50633_IRQ_USBINS, mbc);
443 if (mbcs1 & PCF50633_MBCS1_ADAPTPRES)
444 pcf50633_mbc_irq_handler(PCF50633_IRQ_ADPINS, mbc);
445
446 return 0;
447 }
448
449 static int __devexit pcf50633_mbc_remove(struct platform_device *pdev)
450 {
451 struct pcf50633_mbc *mbc = platform_get_drvdata(pdev);
452 int i;
453
454 /* Remove IRQ handlers */
455 for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++)
456 pcf50633_free_irq(mbc->pcf, mbc_irq_handlers[i]);
457
458 power_supply_unregister(&mbc->usb);
459 power_supply_unregister(&mbc->adapter);
460 power_supply_unregister(&mbc->ac);
461
462 kfree(mbc);
463
464 return 0;
465 }
466
467 static struct platform_driver pcf50633_mbc_driver = {
468 .driver = {
469 .name = "pcf50633-mbc",
470 },
471 .probe = pcf50633_mbc_probe,
472 .remove = __devexit_p(pcf50633_mbc_remove),
473 };
474
475 static int __init pcf50633_mbc_init(void)
476 {
477 return platform_driver_register(&pcf50633_mbc_driver);
478 }
479 module_init(pcf50633_mbc_init);
480
481 static void __exit pcf50633_mbc_exit(void)
482 {
483 platform_driver_unregister(&pcf50633_mbc_driver);
484 }
485 module_exit(pcf50633_mbc_exit);
486
487 MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
488 MODULE_DESCRIPTION("PCF50633 mbc driver");
489 MODULE_LICENSE("GPL");
490 MODULE_ALIAS("platform:pcf50633-mbc");
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