1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* NXP PCF50633 Main Battery Charger Driver
3 *
4 * (C) 2006-2008 by Openmoko, Inc.
5 * Author: Balaji Rao <balajirrao@openmoko.org>
6 * All rights reserved.
7 *
8 * Broken down from monstrous PCF50633 driver mainly by
9 * Harald Welte, Andy Green and Werner Almesberger
10 */
11
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/slab.h>
15 #include <linux/init.h>
16 #include <linux/types.h>
17 #include <linux/device.h>
18 #include <linux/sysfs.h>
19 #include <linux/platform_device.h>
20 #include <linux/power_supply.h>
21
22 #include <linux/mfd/pcf50633/core.h>
23 #include <linux/mfd/pcf50633/mbc.h>
24
25 struct pcf50633_mbc {
26 struct pcf50633 *pcf;
27
28 int adapter_online;
29 int usb_online;
30
31 struct power_supply *usb;
32 struct power_supply *adapter;
33 struct power_supply *ac;
34 };
35
pcf50633_mbc_usb_curlim_set(struct pcf50633 * pcf,int ma)36 int pcf50633_mbc_usb_curlim_set(struct pcf50633 *pcf, int ma)
37 {
38 struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev);
39 int ret = 0;
40 u8 bits;
41 u8 mbcs2, chgmod;
42 unsigned int mbcc5;
43
44 if (ma >= 1000) {
45 bits = PCF50633_MBCC7_USB_1000mA;
46 ma = 1000;
47 } else if (ma >= 500) {
48 bits = PCF50633_MBCC7_USB_500mA;
49 ma = 500;
50 } else if (ma >= 100) {
51 bits = PCF50633_MBCC7_USB_100mA;
52 ma = 100;
53 } else {
54 bits = PCF50633_MBCC7_USB_SUSPEND;
55 ma = 0;
56 }
57
58 ret = pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC7,
59 PCF50633_MBCC7_USB_MASK, bits);
60 if (ret)
61 dev_err(pcf->dev, "error setting usb curlim to %d mA\n", ma);
62 else
63 dev_info(pcf->dev, "usb curlim to %d mA\n", ma);
64
65 /*
66 * We limit the charging current to be the USB current limit.
67 * The reason is that on pcf50633, when it enters PMU Standby mode,
68 * which it does when the device goes "off", the USB current limit
69 * reverts to the variant default. In at least one common case, that
70 * default is 500mA. By setting the charging current to be the same
71 * as the USB limit we set here before PMU standby, we enforce it only
72 * using the correct amount of current even when the USB current limit
73 * gets reset to the wrong thing
74 */
75
76 if (mbc->pcf->pdata->charger_reference_current_ma) {
77 mbcc5 = (ma << 8) / mbc->pcf->pdata->charger_reference_current_ma;
78 if (mbcc5 > 255)
79 mbcc5 = 255;
80 pcf50633_reg_write(mbc->pcf, PCF50633_REG_MBCC5, mbcc5);
81 }
82
83 mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2);
84 chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK);
85
86 /* If chgmod == BATFULL, setting chgena has no effect.
87 * Datasheet says we need to set resume instead but when autoresume is
88 * used resume doesn't work. Clear and set chgena instead.
89 */
90 if (chgmod != PCF50633_MBCS2_MBC_BAT_FULL)
91 pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC1,
92 PCF50633_MBCC1_CHGENA, PCF50633_MBCC1_CHGENA);
93 else {
94 pcf50633_reg_clear_bits(pcf, PCF50633_REG_MBCC1,
95 PCF50633_MBCC1_CHGENA);
96 pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC1,
97 PCF50633_MBCC1_CHGENA, PCF50633_MBCC1_CHGENA);
98 }
99
100 power_supply_changed(mbc->usb);
101
102 return ret;
103 }
104 EXPORT_SYMBOL_GPL(pcf50633_mbc_usb_curlim_set);
105
pcf50633_mbc_get_status(struct pcf50633 * pcf)106 int pcf50633_mbc_get_status(struct pcf50633 *pcf)
107 {
108 struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev);
109 int status = 0;
110 u8 chgmod;
111
112 if (!mbc)
113 return 0;
114
115 chgmod = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2)
116 & PCF50633_MBCS2_MBC_MASK;
117
118 if (mbc->usb_online)
119 status |= PCF50633_MBC_USB_ONLINE;
120 if (chgmod == PCF50633_MBCS2_MBC_USB_PRE ||
121 chgmod == PCF50633_MBCS2_MBC_USB_PRE_WAIT ||
122 chgmod == PCF50633_MBCS2_MBC_USB_FAST ||
123 chgmod == PCF50633_MBCS2_MBC_USB_FAST_WAIT)
124 status |= PCF50633_MBC_USB_ACTIVE;
125 if (mbc->adapter_online)
126 status |= PCF50633_MBC_ADAPTER_ONLINE;
127 if (chgmod == PCF50633_MBCS2_MBC_ADP_PRE ||
128 chgmod == PCF50633_MBCS2_MBC_ADP_PRE_WAIT ||
129 chgmod == PCF50633_MBCS2_MBC_ADP_FAST ||
130 chgmod == PCF50633_MBCS2_MBC_ADP_FAST_WAIT)
131 status |= PCF50633_MBC_ADAPTER_ACTIVE;
132
133 return status;
134 }
135 EXPORT_SYMBOL_GPL(pcf50633_mbc_get_status);
136
pcf50633_mbc_get_usb_online_status(struct pcf50633 * pcf)137 int pcf50633_mbc_get_usb_online_status(struct pcf50633 *pcf)
138 {
139 struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev);
140
141 if (!mbc)
142 return 0;
143
144 return mbc->usb_online;
145 }
146 EXPORT_SYMBOL_GPL(pcf50633_mbc_get_usb_online_status);
147
148 static ssize_t
show_chgmode(struct device * dev,struct device_attribute * attr,char * buf)149 show_chgmode(struct device *dev, struct device_attribute *attr, char *buf)
150 {
151 struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
152
153 u8 mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2);
154 u8 chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK);
155
156 return sysfs_emit(buf, "%d\n", chgmod);
157 }
158 static DEVICE_ATTR(chgmode, S_IRUGO, show_chgmode, NULL);
159
160 static ssize_t
show_usblim(struct device * dev,struct device_attribute * attr,char * buf)161 show_usblim(struct device *dev, struct device_attribute *attr, char *buf)
162 {
163 struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
164 u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
165 PCF50633_MBCC7_USB_MASK;
166 unsigned int ma;
167
168 if (usblim == PCF50633_MBCC7_USB_1000mA)
169 ma = 1000;
170 else if (usblim == PCF50633_MBCC7_USB_500mA)
171 ma = 500;
172 else if (usblim == PCF50633_MBCC7_USB_100mA)
173 ma = 100;
174 else
175 ma = 0;
176
177 return sysfs_emit(buf, "%u\n", ma);
178 }
179
set_usblim(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)180 static ssize_t set_usblim(struct device *dev,
181 struct device_attribute *attr, const char *buf, size_t count)
182 {
183 struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
184 unsigned long ma;
185 int ret;
186
187 ret = kstrtoul(buf, 10, &ma);
188 if (ret)
189 return ret;
190
191 pcf50633_mbc_usb_curlim_set(mbc->pcf, ma);
192
193 return count;
194 }
195
196 static DEVICE_ATTR(usb_curlim, S_IRUGO | S_IWUSR, show_usblim, set_usblim);
197
198 static ssize_t
show_chglim(struct device * dev,struct device_attribute * attr,char * buf)199 show_chglim(struct device *dev, struct device_attribute *attr, char *buf)
200 {
201 struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
202 u8 mbcc5 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC5);
203 unsigned int ma;
204
205 if (!mbc->pcf->pdata->charger_reference_current_ma)
206 return -ENODEV;
207
208 ma = (mbc->pcf->pdata->charger_reference_current_ma * mbcc5) >> 8;
209
210 return sysfs_emit(buf, "%u\n", ma);
211 }
212
set_chglim(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)213 static ssize_t set_chglim(struct device *dev,
214 struct device_attribute *attr, const char *buf, size_t count)
215 {
216 struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
217 unsigned long ma;
218 unsigned int mbcc5;
219 int ret;
220
221 if (!mbc->pcf->pdata->charger_reference_current_ma)
222 return -ENODEV;
223
224 ret = kstrtoul(buf, 10, &ma);
225 if (ret)
226 return ret;
227
228 mbcc5 = (ma << 8) / mbc->pcf->pdata->charger_reference_current_ma;
229 if (mbcc5 > 255)
230 mbcc5 = 255;
231 pcf50633_reg_write(mbc->pcf, PCF50633_REG_MBCC5, mbcc5);
232
233 return count;
234 }
235
236 /*
237 * This attribute allows to change MBC charging limit on the fly
238 * independently of usb current limit. It also gets set automatically every
239 * time usb current limit is changed.
240 */
241 static DEVICE_ATTR(chg_curlim, S_IRUGO | S_IWUSR, show_chglim, set_chglim);
242
243 static struct attribute *pcf50633_mbc_sysfs_attrs[] = {
244 &dev_attr_chgmode.attr,
245 &dev_attr_usb_curlim.attr,
246 &dev_attr_chg_curlim.attr,
247 NULL,
248 };
249
250 ATTRIBUTE_GROUPS(pcf50633_mbc_sysfs);
251
252 static void
pcf50633_mbc_irq_handler(int irq,void * data)253 pcf50633_mbc_irq_handler(int irq, void *data)
254 {
255 struct pcf50633_mbc *mbc = data;
256
257 /* USB */
258 if (irq == PCF50633_IRQ_USBINS) {
259 mbc->usb_online = 1;
260 } else if (irq == PCF50633_IRQ_USBREM) {
261 mbc->usb_online = 0;
262 pcf50633_mbc_usb_curlim_set(mbc->pcf, 0);
263 }
264
265 /* Adapter */
266 if (irq == PCF50633_IRQ_ADPINS)
267 mbc->adapter_online = 1;
268 else if (irq == PCF50633_IRQ_ADPREM)
269 mbc->adapter_online = 0;
270
271 power_supply_changed(mbc->ac);
272 power_supply_changed(mbc->usb);
273 power_supply_changed(mbc->adapter);
274
275 if (mbc->pcf->pdata->mbc_event_callback)
276 mbc->pcf->pdata->mbc_event_callback(mbc->pcf, irq);
277 }
278
adapter_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)279 static int adapter_get_property(struct power_supply *psy,
280 enum power_supply_property psp,
281 union power_supply_propval *val)
282 {
283 struct pcf50633_mbc *mbc = power_supply_get_drvdata(psy);
284 int ret = 0;
285
286 switch (psp) {
287 case POWER_SUPPLY_PROP_ONLINE:
288 val->intval = mbc->adapter_online;
289 break;
290 default:
291 ret = -EINVAL;
292 break;
293 }
294 return ret;
295 }
296
usb_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)297 static int usb_get_property(struct power_supply *psy,
298 enum power_supply_property psp,
299 union power_supply_propval *val)
300 {
301 struct pcf50633_mbc *mbc = power_supply_get_drvdata(psy);
302 int ret = 0;
303 u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
304 PCF50633_MBCC7_USB_MASK;
305
306 switch (psp) {
307 case POWER_SUPPLY_PROP_ONLINE:
308 val->intval = mbc->usb_online &&
309 (usblim <= PCF50633_MBCC7_USB_500mA);
310 break;
311 default:
312 ret = -EINVAL;
313 break;
314 }
315 return ret;
316 }
317
ac_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)318 static int ac_get_property(struct power_supply *psy,
319 enum power_supply_property psp,
320 union power_supply_propval *val)
321 {
322 struct pcf50633_mbc *mbc = power_supply_get_drvdata(psy);
323 int ret = 0;
324 u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
325 PCF50633_MBCC7_USB_MASK;
326
327 switch (psp) {
328 case POWER_SUPPLY_PROP_ONLINE:
329 val->intval = mbc->usb_online &&
330 (usblim == PCF50633_MBCC7_USB_1000mA);
331 break;
332 default:
333 ret = -EINVAL;
334 break;
335 }
336 return ret;
337 }
338
339 static enum power_supply_property power_props[] = {
340 POWER_SUPPLY_PROP_ONLINE,
341 };
342
343 static const u8 mbc_irq_handlers[] = {
344 PCF50633_IRQ_ADPINS,
345 PCF50633_IRQ_ADPREM,
346 PCF50633_IRQ_USBINS,
347 PCF50633_IRQ_USBREM,
348 PCF50633_IRQ_BATFULL,
349 PCF50633_IRQ_CHGHALT,
350 PCF50633_IRQ_THLIMON,
351 PCF50633_IRQ_THLIMOFF,
352 PCF50633_IRQ_USBLIMON,
353 PCF50633_IRQ_USBLIMOFF,
354 PCF50633_IRQ_LOWSYS,
355 PCF50633_IRQ_LOWBAT,
356 };
357
358 static const struct power_supply_desc pcf50633_mbc_adapter_desc = {
359 .name = "adapter",
360 .type = POWER_SUPPLY_TYPE_MAINS,
361 .properties = power_props,
362 .num_properties = ARRAY_SIZE(power_props),
363 .get_property = &adapter_get_property,
364 };
365
366 static const struct power_supply_desc pcf50633_mbc_usb_desc = {
367 .name = "usb",
368 .type = POWER_SUPPLY_TYPE_USB,
369 .properties = power_props,
370 .num_properties = ARRAY_SIZE(power_props),
371 .get_property = usb_get_property,
372 };
373
374 static const struct power_supply_desc pcf50633_mbc_ac_desc = {
375 .name = "ac",
376 .type = POWER_SUPPLY_TYPE_MAINS,
377 .properties = power_props,
378 .num_properties = ARRAY_SIZE(power_props),
379 .get_property = ac_get_property,
380 };
381
pcf50633_mbc_probe(struct platform_device * pdev)382 static int pcf50633_mbc_probe(struct platform_device *pdev)
383 {
384 struct power_supply_config psy_cfg = {};
385 struct power_supply_config usb_psy_cfg;
386 struct pcf50633_mbc *mbc;
387 int i;
388 u8 mbcs1;
389
390 mbc = devm_kzalloc(&pdev->dev, sizeof(*mbc), GFP_KERNEL);
391 if (!mbc)
392 return -ENOMEM;
393
394 platform_set_drvdata(pdev, mbc);
395 mbc->pcf = dev_to_pcf50633(pdev->dev.parent);
396
397 /* Set up IRQ handlers */
398 for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++)
399 pcf50633_register_irq(mbc->pcf, mbc_irq_handlers[i],
400 pcf50633_mbc_irq_handler, mbc);
401
402 psy_cfg.supplied_to = mbc->pcf->pdata->batteries;
403 psy_cfg.num_supplicants = mbc->pcf->pdata->num_batteries;
404 psy_cfg.drv_data = mbc;
405
406 /* Create power supplies */
407 mbc->adapter = devm_power_supply_register(&pdev->dev,
408 &pcf50633_mbc_adapter_desc,
409 &psy_cfg);
410 if (IS_ERR(mbc->adapter)) {
411 dev_err(mbc->pcf->dev, "failed to register adapter\n");
412 return PTR_ERR(mbc->adapter);
413 }
414
415 usb_psy_cfg = psy_cfg;
416 usb_psy_cfg.attr_grp = pcf50633_mbc_sysfs_groups;
417
418 mbc->usb = devm_power_supply_register(&pdev->dev,
419 &pcf50633_mbc_usb_desc,
420 &usb_psy_cfg);
421 if (IS_ERR(mbc->usb)) {
422 dev_err(mbc->pcf->dev, "failed to register usb\n");
423 return PTR_ERR(mbc->usb);
424 }
425
426 mbc->ac = devm_power_supply_register(&pdev->dev,
427 &pcf50633_mbc_ac_desc,
428 &psy_cfg);
429 if (IS_ERR(mbc->ac)) {
430 dev_err(mbc->pcf->dev, "failed to register ac\n");
431 return PTR_ERR(mbc->ac);
432 }
433
434 mbcs1 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS1);
435 if (mbcs1 & PCF50633_MBCS1_USBPRES)
436 pcf50633_mbc_irq_handler(PCF50633_IRQ_USBINS, mbc);
437 if (mbcs1 & PCF50633_MBCS1_ADAPTPRES)
438 pcf50633_mbc_irq_handler(PCF50633_IRQ_ADPINS, mbc);
439
440 return 0;
441 }
442
pcf50633_mbc_remove(struct platform_device * pdev)443 static void pcf50633_mbc_remove(struct platform_device *pdev)
444 {
445 struct pcf50633_mbc *mbc = platform_get_drvdata(pdev);
446 int i;
447
448 /* Remove IRQ handlers */
449 for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++)
450 pcf50633_free_irq(mbc->pcf, mbc_irq_handlers[i]);
451 }
452
453 static struct platform_driver pcf50633_mbc_driver = {
454 .driver = {
455 .name = "pcf50633-mbc",
456 },
457 .probe = pcf50633_mbc_probe,
458 .remove = pcf50633_mbc_remove,
459 };
460
461 module_platform_driver(pcf50633_mbc_driver);
462
463 MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
464 MODULE_DESCRIPTION("PCF50633 mbc driver");
465 MODULE_LICENSE("GPL");
466 MODULE_ALIAS("platform:pcf50633-mbc");
467