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 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 ma = 0;
61 }
62
63 ret = pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC7,
64 PCF50633_MBCC7_USB_MASK, bits);
65 if (ret)
66 dev_err(pcf->dev, "error setting usb curlim to %d mA\n", ma);
67 else
68 dev_info(pcf->dev, "usb curlim to %d mA\n", ma);
69
70 /*
71 * We limit the charging current to be the USB current limit.
72 * The reason is that on pcf50633, when it enters PMU Standby mode,
73 * which it does when the device goes "off", the USB current limit
74 * reverts to the variant default. In at least one common case, that
75 * default is 500mA. By setting the charging current to be the same
76 * as the USB limit we set here before PMU standby, we enforce it only
77 * using the correct amount of current even when the USB current limit
78 * gets reset to the wrong thing
79 */
80
81 if (mbc->pcf->pdata->charger_reference_current_ma) {
82 mbcc5 = (ma << 8) / mbc->pcf->pdata->charger_reference_current_ma;
83 if (mbcc5 > 255)
84 mbcc5 = 255;
85 pcf50633_reg_write(mbc->pcf, PCF50633_REG_MBCC5, mbcc5);
86 }
87
88 mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2);
89 chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK);
90
91 /* If chgmod == BATFULL, setting chgena has no effect.
92 * Datasheet says we need to set resume instead but when autoresume is
93 * used resume doesn't work. Clear and set chgena instead.
94 */
95 if (chgmod != PCF50633_MBCS2_MBC_BAT_FULL)
96 pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC1,
97 PCF50633_MBCC1_CHGENA, PCF50633_MBCC1_CHGENA);
98 else {
99 pcf50633_reg_clear_bits(pcf, PCF50633_REG_MBCC1,
100 PCF50633_MBCC1_CHGENA);
101 pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC1,
102 PCF50633_MBCC1_CHGENA, PCF50633_MBCC1_CHGENA);
103 }
104
105 power_supply_changed(mbc->usb);
106
107 return ret;
108 }
109 EXPORT_SYMBOL_GPL(pcf50633_mbc_usb_curlim_set);
110
pcf50633_mbc_get_status(struct pcf50633 * pcf)111 int pcf50633_mbc_get_status(struct pcf50633 *pcf)
112 {
113 struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev);
114 int status = 0;
115 u8 chgmod;
116
117 if (!mbc)
118 return 0;
119
120 chgmod = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2)
121 & PCF50633_MBCS2_MBC_MASK;
122
123 if (mbc->usb_online)
124 status |= PCF50633_MBC_USB_ONLINE;
125 if (chgmod == PCF50633_MBCS2_MBC_USB_PRE ||
126 chgmod == PCF50633_MBCS2_MBC_USB_PRE_WAIT ||
127 chgmod == PCF50633_MBCS2_MBC_USB_FAST ||
128 chgmod == PCF50633_MBCS2_MBC_USB_FAST_WAIT)
129 status |= PCF50633_MBC_USB_ACTIVE;
130 if (mbc->adapter_online)
131 status |= PCF50633_MBC_ADAPTER_ONLINE;
132 if (chgmod == PCF50633_MBCS2_MBC_ADP_PRE ||
133 chgmod == PCF50633_MBCS2_MBC_ADP_PRE_WAIT ||
134 chgmod == PCF50633_MBCS2_MBC_ADP_FAST ||
135 chgmod == PCF50633_MBCS2_MBC_ADP_FAST_WAIT)
136 status |= PCF50633_MBC_ADAPTER_ACTIVE;
137
138 return status;
139 }
140 EXPORT_SYMBOL_GPL(pcf50633_mbc_get_status);
141
pcf50633_mbc_get_usb_online_status(struct pcf50633 * pcf)142 int pcf50633_mbc_get_usb_online_status(struct pcf50633 *pcf)
143 {
144 struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev);
145
146 if (!mbc)
147 return 0;
148
149 return mbc->usb_online;
150 }
151 EXPORT_SYMBOL_GPL(pcf50633_mbc_get_usb_online_status);
152
153 static ssize_t
show_chgmode(struct device * dev,struct device_attribute * attr,char * buf)154 show_chgmode(struct device *dev, struct device_attribute *attr, char *buf)
155 {
156 struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
157
158 u8 mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2);
159 u8 chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK);
160
161 return sprintf(buf, "%d\n", chgmod);
162 }
163 static DEVICE_ATTR(chgmode, S_IRUGO, show_chgmode, NULL);
164
165 static ssize_t
show_usblim(struct device * dev,struct device_attribute * attr,char * buf)166 show_usblim(struct device *dev, struct device_attribute *attr, char *buf)
167 {
168 struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
169 u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
170 PCF50633_MBCC7_USB_MASK;
171 unsigned int ma;
172
173 if (usblim == PCF50633_MBCC7_USB_1000mA)
174 ma = 1000;
175 else if (usblim == PCF50633_MBCC7_USB_500mA)
176 ma = 500;
177 else if (usblim == PCF50633_MBCC7_USB_100mA)
178 ma = 100;
179 else
180 ma = 0;
181
182 return sprintf(buf, "%u\n", ma);
183 }
184
set_usblim(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)185 static ssize_t set_usblim(struct device *dev,
186 struct device_attribute *attr, const char *buf, size_t count)
187 {
188 struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
189 unsigned long ma;
190 int ret;
191
192 ret = kstrtoul(buf, 10, &ma);
193 if (ret)
194 return ret;
195
196 pcf50633_mbc_usb_curlim_set(mbc->pcf, ma);
197
198 return count;
199 }
200
201 static DEVICE_ATTR(usb_curlim, S_IRUGO | S_IWUSR, show_usblim, set_usblim);
202
203 static ssize_t
show_chglim(struct device * dev,struct device_attribute * attr,char * buf)204 show_chglim(struct device *dev, struct device_attribute *attr, char *buf)
205 {
206 struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
207 u8 mbcc5 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC5);
208 unsigned int ma;
209
210 if (!mbc->pcf->pdata->charger_reference_current_ma)
211 return -ENODEV;
212
213 ma = (mbc->pcf->pdata->charger_reference_current_ma * mbcc5) >> 8;
214
215 return sprintf(buf, "%u\n", ma);
216 }
217
set_chglim(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)218 static ssize_t set_chglim(struct device *dev,
219 struct device_attribute *attr, const char *buf, size_t count)
220 {
221 struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
222 unsigned long ma;
223 unsigned int mbcc5;
224 int ret;
225
226 if (!mbc->pcf->pdata->charger_reference_current_ma)
227 return -ENODEV;
228
229 ret = kstrtoul(buf, 10, &ma);
230 if (ret)
231 return ret;
232
233 mbcc5 = (ma << 8) / mbc->pcf->pdata->charger_reference_current_ma;
234 if (mbcc5 > 255)
235 mbcc5 = 255;
236 pcf50633_reg_write(mbc->pcf, PCF50633_REG_MBCC5, mbcc5);
237
238 return count;
239 }
240
241 /*
242 * This attribute allows to change MBC charging limit on the fly
243 * independently of usb current limit. It also gets set automatically every
244 * time usb current limit is changed.
245 */
246 static DEVICE_ATTR(chg_curlim, S_IRUGO | S_IWUSR, show_chglim, set_chglim);
247
248 static struct attribute *pcf50633_mbc_sysfs_entries[] = {
249 &dev_attr_chgmode.attr,
250 &dev_attr_usb_curlim.attr,
251 &dev_attr_chg_curlim.attr,
252 NULL,
253 };
254
255 static const struct attribute_group mbc_attr_group = {
256 .name = NULL, /* put in device directory */
257 .attrs = pcf50633_mbc_sysfs_entries,
258 };
259
260 static void
pcf50633_mbc_irq_handler(int irq,void * data)261 pcf50633_mbc_irq_handler(int irq, void *data)
262 {
263 struct pcf50633_mbc *mbc = data;
264
265 /* USB */
266 if (irq == PCF50633_IRQ_USBINS) {
267 mbc->usb_online = 1;
268 } else if (irq == PCF50633_IRQ_USBREM) {
269 mbc->usb_online = 0;
270 pcf50633_mbc_usb_curlim_set(mbc->pcf, 0);
271 }
272
273 /* Adapter */
274 if (irq == PCF50633_IRQ_ADPINS)
275 mbc->adapter_online = 1;
276 else if (irq == PCF50633_IRQ_ADPREM)
277 mbc->adapter_online = 0;
278
279 power_supply_changed(mbc->ac);
280 power_supply_changed(mbc->usb);
281 power_supply_changed(mbc->adapter);
282
283 if (mbc->pcf->pdata->mbc_event_callback)
284 mbc->pcf->pdata->mbc_event_callback(mbc->pcf, irq);
285 }
286
adapter_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)287 static int adapter_get_property(struct power_supply *psy,
288 enum power_supply_property psp,
289 union power_supply_propval *val)
290 {
291 struct pcf50633_mbc *mbc = power_supply_get_drvdata(psy);
292 int ret = 0;
293
294 switch (psp) {
295 case POWER_SUPPLY_PROP_ONLINE:
296 val->intval = mbc->adapter_online;
297 break;
298 default:
299 ret = -EINVAL;
300 break;
301 }
302 return ret;
303 }
304
usb_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)305 static int usb_get_property(struct power_supply *psy,
306 enum power_supply_property psp,
307 union power_supply_propval *val)
308 {
309 struct pcf50633_mbc *mbc = power_supply_get_drvdata(psy);
310 int ret = 0;
311 u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
312 PCF50633_MBCC7_USB_MASK;
313
314 switch (psp) {
315 case POWER_SUPPLY_PROP_ONLINE:
316 val->intval = mbc->usb_online &&
317 (usblim <= PCF50633_MBCC7_USB_500mA);
318 break;
319 default:
320 ret = -EINVAL;
321 break;
322 }
323 return ret;
324 }
325
ac_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)326 static int ac_get_property(struct power_supply *psy,
327 enum power_supply_property psp,
328 union power_supply_propval *val)
329 {
330 struct pcf50633_mbc *mbc = power_supply_get_drvdata(psy);
331 int ret = 0;
332 u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
333 PCF50633_MBCC7_USB_MASK;
334
335 switch (psp) {
336 case POWER_SUPPLY_PROP_ONLINE:
337 val->intval = mbc->usb_online &&
338 (usblim == PCF50633_MBCC7_USB_1000mA);
339 break;
340 default:
341 ret = -EINVAL;
342 break;
343 }
344 return ret;
345 }
346
347 static enum power_supply_property power_props[] = {
348 POWER_SUPPLY_PROP_ONLINE,
349 };
350
351 static const u8 mbc_irq_handlers[] = {
352 PCF50633_IRQ_ADPINS,
353 PCF50633_IRQ_ADPREM,
354 PCF50633_IRQ_USBINS,
355 PCF50633_IRQ_USBREM,
356 PCF50633_IRQ_BATFULL,
357 PCF50633_IRQ_CHGHALT,
358 PCF50633_IRQ_THLIMON,
359 PCF50633_IRQ_THLIMOFF,
360 PCF50633_IRQ_USBLIMON,
361 PCF50633_IRQ_USBLIMOFF,
362 PCF50633_IRQ_LOWSYS,
363 PCF50633_IRQ_LOWBAT,
364 };
365
366 static const struct power_supply_desc pcf50633_mbc_adapter_desc = {
367 .name = "adapter",
368 .type = POWER_SUPPLY_TYPE_MAINS,
369 .properties = power_props,
370 .num_properties = ARRAY_SIZE(power_props),
371 .get_property = &adapter_get_property,
372 };
373
374 static const struct power_supply_desc pcf50633_mbc_usb_desc = {
375 .name = "usb",
376 .type = POWER_SUPPLY_TYPE_USB,
377 .properties = power_props,
378 .num_properties = ARRAY_SIZE(power_props),
379 .get_property = usb_get_property,
380 };
381
382 static const struct power_supply_desc pcf50633_mbc_ac_desc = {
383 .name = "ac",
384 .type = POWER_SUPPLY_TYPE_MAINS,
385 .properties = power_props,
386 .num_properties = ARRAY_SIZE(power_props),
387 .get_property = ac_get_property,
388 };
389
pcf50633_mbc_probe(struct platform_device * pdev)390 static int pcf50633_mbc_probe(struct platform_device *pdev)
391 {
392 struct power_supply_config psy_cfg = {};
393 struct pcf50633_mbc *mbc;
394 int i;
395 u8 mbcs1;
396
397 mbc = devm_kzalloc(&pdev->dev, sizeof(*mbc), GFP_KERNEL);
398 if (!mbc)
399 return -ENOMEM;
400
401 platform_set_drvdata(pdev, mbc);
402 mbc->pcf = dev_to_pcf50633(pdev->dev.parent);
403
404 /* Set up IRQ handlers */
405 for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++)
406 pcf50633_register_irq(mbc->pcf, mbc_irq_handlers[i],
407 pcf50633_mbc_irq_handler, mbc);
408
409 psy_cfg.supplied_to = mbc->pcf->pdata->batteries;
410 psy_cfg.num_supplicants = mbc->pcf->pdata->num_batteries;
411 psy_cfg.drv_data = mbc;
412
413 /* Create power supplies */
414 mbc->adapter = power_supply_register(&pdev->dev,
415 &pcf50633_mbc_adapter_desc,
416 &psy_cfg);
417 if (IS_ERR(mbc->adapter)) {
418 dev_err(mbc->pcf->dev, "failed to register adapter\n");
419 return PTR_ERR(mbc->adapter);
420 }
421
422 mbc->usb = power_supply_register(&pdev->dev, &pcf50633_mbc_usb_desc,
423 &psy_cfg);
424 if (IS_ERR(mbc->usb)) {
425 dev_err(mbc->pcf->dev, "failed to register usb\n");
426 power_supply_unregister(mbc->adapter);
427 return PTR_ERR(mbc->usb);
428 }
429
430 mbc->ac = power_supply_register(&pdev->dev, &pcf50633_mbc_ac_desc,
431 &psy_cfg);
432 if (IS_ERR(mbc->ac)) {
433 dev_err(mbc->pcf->dev, "failed to register ac\n");
434 power_supply_unregister(mbc->adapter);
435 power_supply_unregister(mbc->usb);
436 return PTR_ERR(mbc->ac);
437 }
438
439 if (sysfs_create_group(&pdev->dev.kobj, &mbc_attr_group))
440 dev_err(mbc->pcf->dev, "failed to create sysfs entries\n");
441
442 mbcs1 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS1);
443 if (mbcs1 & PCF50633_MBCS1_USBPRES)
444 pcf50633_mbc_irq_handler(PCF50633_IRQ_USBINS, mbc);
445 if (mbcs1 & PCF50633_MBCS1_ADAPTPRES)
446 pcf50633_mbc_irq_handler(PCF50633_IRQ_ADPINS, mbc);
447
448 return 0;
449 }
450
pcf50633_mbc_remove(struct platform_device * pdev)451 static int pcf50633_mbc_remove(struct platform_device *pdev)
452 {
453 struct pcf50633_mbc *mbc = platform_get_drvdata(pdev);
454 int i;
455
456 /* Remove IRQ handlers */
457 for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++)
458 pcf50633_free_irq(mbc->pcf, mbc_irq_handlers[i]);
459
460 sysfs_remove_group(&pdev->dev.kobj, &mbc_attr_group);
461 power_supply_unregister(mbc->usb);
462 power_supply_unregister(mbc->adapter);
463 power_supply_unregister(mbc->ac);
464
465 return 0;
466 }
467
468 static struct platform_driver pcf50633_mbc_driver = {
469 .driver = {
470 .name = "pcf50633-mbc",
471 },
472 .probe = pcf50633_mbc_probe,
473 .remove = pcf50633_mbc_remove,
474 };
475
476 module_platform_driver(pcf50633_mbc_driver);
477
478 MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
479 MODULE_DESCRIPTION("PCF50633 mbc driver");
480 MODULE_LICENSE("GPL");
481 MODULE_ALIAS("platform:pcf50633-mbc");
482
