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