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Linux/drivers/power/pcf50633-charger.c

  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 
 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 
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 
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
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
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 
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 = kstrtoul(buf, 10, &ma);
195         if (ret)
196                 return ret;
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
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 
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 = kstrtoul(buf, 10, &ma);
232         if (ret)
233                 return ret;
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
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 
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 
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 
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 
369 static int 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 = devm_kzalloc(&pdev->dev, 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                 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                 return ret;
424         }
425 
426         ret = power_supply_register(&pdev->dev, &mbc->ac);
427         if (ret) {
428                 dev_err(mbc->pcf->dev, "failed to register ac\n");
429                 power_supply_unregister(&mbc->adapter);
430                 power_supply_unregister(&mbc->usb);
431                 return ret;
432         }
433 
434         ret = sysfs_create_group(&pdev->dev.kobj, &mbc_attr_group);
435         if (ret)
436                 dev_err(mbc->pcf->dev, "failed to create sysfs entries\n");
437 
438         mbcs1 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS1);
439         if (mbcs1 & PCF50633_MBCS1_USBPRES)
440                 pcf50633_mbc_irq_handler(PCF50633_IRQ_USBINS, mbc);
441         if (mbcs1 & PCF50633_MBCS1_ADAPTPRES)
442                 pcf50633_mbc_irq_handler(PCF50633_IRQ_ADPINS, mbc);
443 
444         return 0;
445 }
446 
447 static int pcf50633_mbc_remove(struct platform_device *pdev)
448 {
449         struct pcf50633_mbc *mbc = platform_get_drvdata(pdev);
450         int i;
451 
452         /* Remove IRQ handlers */
453         for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++)
454                 pcf50633_free_irq(mbc->pcf, mbc_irq_handlers[i]);
455 
456         sysfs_remove_group(&pdev->dev.kobj, &mbc_attr_group);
457         power_supply_unregister(&mbc->usb);
458         power_supply_unregister(&mbc->adapter);
459         power_supply_unregister(&mbc->ac);
460 
461         return 0;
462 }
463 
464 static struct platform_driver pcf50633_mbc_driver = {
465         .driver = {
466                 .name = "pcf50633-mbc",
467         },
468         .probe = pcf50633_mbc_probe,
469         .remove = pcf50633_mbc_remove,
470 };
471 
472 module_platform_driver(pcf50633_mbc_driver);
473 
474 MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
475 MODULE_DESCRIPTION("PCF50633 mbc driver");
476 MODULE_LICENSE("GPL");
477 MODULE_ALIAS("platform:pcf50633-mbc");
478 

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