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 
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 
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 
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
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
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 
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
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 
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
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 
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 
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 
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 
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 = 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 = power_supply_register(&pdev->dev, &pcf50633_mbc_usb_desc,
419 					 &usb_psy_cfg);
420 	if (IS_ERR(mbc->usb)) {
421 		dev_err(mbc->pcf->dev, "failed to register usb\n");
422 		power_supply_unregister(mbc->adapter);
423 		return PTR_ERR(mbc->usb);
424 	}
425 
426 	mbc->ac = power_supply_register(&pdev->dev, &pcf50633_mbc_ac_desc,
427 					&psy_cfg);
428 	if (IS_ERR(mbc->ac)) {
429 		dev_err(mbc->pcf->dev, "failed to register ac\n");
430 		power_supply_unregister(mbc->adapter);
431 		power_supply_unregister(mbc->usb);
432 		return PTR_ERR(mbc->ac);
433 	}
434 
435 	mbcs1 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS1);
436 	if (mbcs1 & PCF50633_MBCS1_USBPRES)
437 		pcf50633_mbc_irq_handler(PCF50633_IRQ_USBINS, mbc);
438 	if (mbcs1 & PCF50633_MBCS1_ADAPTPRES)
439 		pcf50633_mbc_irq_handler(PCF50633_IRQ_ADPINS, mbc);
440 
441 	return 0;
442 }
443 
444 static int pcf50633_mbc_remove(struct platform_device *pdev)
445 {
446 	struct pcf50633_mbc *mbc = platform_get_drvdata(pdev);
447 	int i;
448 
449 	/* Remove IRQ handlers */
450 	for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++)
451 		pcf50633_free_irq(mbc->pcf, mbc_irq_handlers[i]);
452 
453 	power_supply_unregister(mbc->usb);
454 	power_supply_unregister(mbc->adapter);
455 	power_supply_unregister(mbc->ac);
456 
457 	return 0;
458 }
459 
460 static struct platform_driver pcf50633_mbc_driver = {
461 	.driver = {
462 		.name = "pcf50633-mbc",
463 	},
464 	.probe = pcf50633_mbc_probe,
465 	.remove = pcf50633_mbc_remove,
466 };
467 
468 module_platform_driver(pcf50633_mbc_driver);
469 
470 MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
471 MODULE_DESCRIPTION("PCF50633 mbc driver");
472 MODULE_LICENSE("GPL");
473 MODULE_ALIAS("platform:pcf50633-mbc");
474