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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 = power_supply_get_drvdata(psy);
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 = power_supply_get_drvdata(psy);
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 = power_supply_get_drvdata(psy);
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 const struct power_supply_desc pcf50633_mbc_adapter_desc = {
369         .name           = "adapter",
370         .type           = POWER_SUPPLY_TYPE_MAINS,
371         .properties     = power_props,
372         .num_properties = ARRAY_SIZE(power_props),
373         .get_property   = &adapter_get_property,
374 };
375 
376 static const struct power_supply_desc pcf50633_mbc_usb_desc = {
377         .name           = "usb",
378         .type           = POWER_SUPPLY_TYPE_USB,
379         .properties     = power_props,
380         .num_properties = ARRAY_SIZE(power_props),
381         .get_property   = usb_get_property,
382 };
383 
384 static const struct power_supply_desc pcf50633_mbc_ac_desc = {
385         .name           = "ac",
386         .type           = POWER_SUPPLY_TYPE_MAINS,
387         .properties     = power_props,
388         .num_properties = ARRAY_SIZE(power_props),
389         .get_property   = ac_get_property,
390 };
391 
392 static int pcf50633_mbc_probe(struct platform_device *pdev)
393 {
394         struct power_supply_config psy_cfg = {};
395         struct pcf50633_mbc *mbc;
396         int ret;
397         int i;
398         u8 mbcs1;
399 
400         mbc = devm_kzalloc(&pdev->dev, sizeof(*mbc), GFP_KERNEL);
401         if (!mbc)
402                 return -ENOMEM;
403 
404         platform_set_drvdata(pdev, mbc);
405         mbc->pcf = dev_to_pcf50633(pdev->dev.parent);
406 
407         /* Set up IRQ handlers */
408         for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++)
409                 pcf50633_register_irq(mbc->pcf, mbc_irq_handlers[i],
410                                         pcf50633_mbc_irq_handler, mbc);
411 
412         psy_cfg.supplied_to             = mbc->pcf->pdata->batteries;
413         psy_cfg.num_supplicants         = mbc->pcf->pdata->num_batteries;
414         psy_cfg.drv_data                = mbc;
415 
416         /* Create power supplies */
417         mbc->adapter = power_supply_register(&pdev->dev,
418                                              &pcf50633_mbc_adapter_desc,
419                                              &psy_cfg);
420         if (IS_ERR(mbc->adapter)) {
421                 dev_err(mbc->pcf->dev, "failed to register adapter\n");
422                 ret = PTR_ERR(mbc->adapter);
423                 return ret;
424         }
425 
426         mbc->usb = power_supply_register(&pdev->dev, &pcf50633_mbc_usb_desc,
427                                          &psy_cfg);
428         if (IS_ERR(mbc->usb)) {
429                 dev_err(mbc->pcf->dev, "failed to register usb\n");
430                 power_supply_unregister(mbc->adapter);
431                 ret = PTR_ERR(mbc->usb);
432                 return ret;
433         }
434 
435         mbc->ac = power_supply_register(&pdev->dev, &pcf50633_mbc_ac_desc,
436                                         &psy_cfg);
437         if (IS_ERR(mbc->ac)) {
438                 dev_err(mbc->pcf->dev, "failed to register ac\n");
439                 power_supply_unregister(mbc->adapter);
440                 power_supply_unregister(mbc->usb);
441                 ret = PTR_ERR(mbc->ac);
442                 return ret;
443         }
444 
445         ret = sysfs_create_group(&pdev->dev.kobj, &mbc_attr_group);
446         if (ret)
447                 dev_err(mbc->pcf->dev, "failed to create sysfs entries\n");
448 
449         mbcs1 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS1);
450         if (mbcs1 & PCF50633_MBCS1_USBPRES)
451                 pcf50633_mbc_irq_handler(PCF50633_IRQ_USBINS, mbc);
452         if (mbcs1 & PCF50633_MBCS1_ADAPTPRES)
453                 pcf50633_mbc_irq_handler(PCF50633_IRQ_ADPINS, mbc);
454 
455         return 0;
456 }
457 
458 static int pcf50633_mbc_remove(struct platform_device *pdev)
459 {
460         struct pcf50633_mbc *mbc = platform_get_drvdata(pdev);
461         int i;
462 
463         /* Remove IRQ handlers */
464         for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++)
465                 pcf50633_free_irq(mbc->pcf, mbc_irq_handlers[i]);
466 
467         sysfs_remove_group(&pdev->dev.kobj, &mbc_attr_group);
468         power_supply_unregister(mbc->usb);
469         power_supply_unregister(mbc->adapter);
470         power_supply_unregister(mbc->ac);
471 
472         return 0;
473 }
474 
475 static struct platform_driver pcf50633_mbc_driver = {
476         .driver = {
477                 .name = "pcf50633-mbc",
478         },
479         .probe = pcf50633_mbc_probe,
480         .remove = pcf50633_mbc_remove,
481 };
482 
483 module_platform_driver(pcf50633_mbc_driver);
484 
485 MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
486 MODULE_DESCRIPTION("PCF50633 mbc driver");
487 MODULE_LICENSE("GPL");
488 MODULE_ALIAS("platform:pcf50633-mbc");
489 

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