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f5714dc9 BR |
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> | |
5a0e3ad6 | 19 | #include <linux/slab.h> |
f5714dc9 BR |
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 | ||
f5714dc9 | 33 | int adapter_online; |
f5714dc9 BR |
34 | int usb_online; |
35 | ||
36 | struct power_supply usb; | |
37 | struct power_supply adapter; | |
7677f33f | 38 | struct power_supply ac; |
f5714dc9 BR |
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; | |
9705ecc5 BR |
46 | int charging_start = 1; |
47 | u8 mbcs2, chgmod; | |
31b4ff06 | 48 | unsigned int mbcc5; |
f5714dc9 | 49 | |
31b4ff06 | 50 | if (ma >= 1000) { |
f5714dc9 | 51 | bits = PCF50633_MBCC7_USB_1000mA; |
31b4ff06 BR |
52 | ma = 1000; |
53 | } else if (ma >= 500) { | |
f5714dc9 | 54 | bits = PCF50633_MBCC7_USB_500mA; |
31b4ff06 BR |
55 | ma = 500; |
56 | } else if (ma >= 100) { | |
f5714dc9 | 57 | bits = PCF50633_MBCC7_USB_100mA; |
31b4ff06 BR |
58 | ma = 100; |
59 | } else { | |
f5714dc9 | 60 | bits = PCF50633_MBCC7_USB_SUSPEND; |
9705ecc5 | 61 | charging_start = 0; |
31b4ff06 | 62 | ma = 0; |
9705ecc5 | 63 | } |
f5714dc9 BR |
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 | ||
31b4ff06 BR |
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 | ||
c3297950 | 90 | mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2); |
9705ecc5 BR |
91 | chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK); |
92 | ||
93 | /* If chgmod == BATFULL, setting chgena has no effect. | |
1282b35a PF |
94 | * Datasheet says we need to set resume instead but when autoresume is |
95 | * used resume doesn't work. Clear and set chgena instead. | |
9705ecc5 BR |
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); | |
1282b35a PF |
100 | else { |
101 | pcf50633_reg_clear_bits(pcf, PCF50633_REG_MBCC1, | |
102 | PCF50633_MBCC1_CHGENA); | |
9705ecc5 | 103 | pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC1, |
1282b35a PF |
104 | PCF50633_MBCC1_CHGENA, PCF50633_MBCC1_CHGENA); |
105 | } | |
9705ecc5 | 106 | |
f5714dc9 BR |
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; | |
c3297950 PF |
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; | |
f5714dc9 BR |
124 | |
125 | if (mbc->usb_online) | |
126 | status |= PCF50633_MBC_USB_ONLINE; | |
c3297950 PF |
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) | |
f5714dc9 BR |
131 | status |= PCF50633_MBC_USB_ACTIVE; |
132 | if (mbc->adapter_online) | |
133 | status |= PCF50633_MBC_ADAPTER_ONLINE; | |
c3297950 PF |
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) | |
f5714dc9 BR |
138 | status |= PCF50633_MBC_ADAPTER_ACTIVE; |
139 | ||
140 | return status; | |
141 | } | |
142 | EXPORT_SYMBOL_GPL(pcf50633_mbc_get_status); | |
143 | ||
c3297950 PF |
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 | ||
f5714dc9 BR |
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 = strict_strtoul(buf, 10, &ma); | |
195 | if (ret) | |
196 | return -EINVAL; | |
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 | ||
31b4ff06 BR |
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 = strict_strtoul(buf, 10, &ma); | |
232 | if (ret) | |
233 | return -EINVAL; | |
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 | ||
f5714dc9 BR |
250 | static struct attribute *pcf50633_mbc_sysfs_entries[] = { |
251 | &dev_attr_chgmode.attr, | |
252 | &dev_attr_usb_curlim.attr, | |
31b4ff06 | 253 | &dev_attr_chg_curlim.attr, |
f5714dc9 BR |
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; | |
f5714dc9 BR |
272 | pcf50633_mbc_usb_curlim_set(mbc->pcf, 0); |
273 | } | |
274 | ||
275 | /* Adapter */ | |
c3297950 | 276 | if (irq == PCF50633_IRQ_ADPINS) |
f5714dc9 | 277 | mbc->adapter_online = 1; |
c3297950 | 278 | else if (irq == PCF50633_IRQ_ADPREM) |
f5714dc9 | 279 | mbc->adapter_online = 0; |
f5714dc9 | 280 | |
7677f33f | 281 | power_supply_changed(&mbc->ac); |
f5714dc9 BR |
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 | { | |
ccc9c8b9 BR |
293 | struct pcf50633_mbc *mbc = container_of(psy, |
294 | struct pcf50633_mbc, adapter); | |
f5714dc9 BR |
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; | |
7677f33f SM |
314 | u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) & |
315 | PCF50633_MBCC7_USB_MASK; | |
f5714dc9 BR |
316 | |
317 | switch (psp) { | |
318 | case POWER_SUPPLY_PROP_ONLINE: | |
7677f33f SM |
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; | |
f5714dc9 BR |
337 | |
338 | switch (psp) { | |
339 | case POWER_SUPPLY_PROP_ONLINE: | |
7677f33f SM |
340 | val->intval = mbc->usb_online && |
341 | (usblim == PCF50633_MBCC7_USB_1000mA); | |
f5714dc9 BR |
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 __devinit pcf50633_mbc_probe(struct platform_device *pdev) | |
370 | { | |
371 | struct pcf50633_mbc *mbc; | |
f5714dc9 BR |
372 | int ret; |
373 | int i; | |
374 | u8 mbcs1; | |
375 | ||
376 | mbc = kzalloc(sizeof(*mbc), GFP_KERNEL); | |
377 | if (!mbc) | |
378 | return -ENOMEM; | |
379 | ||
380 | platform_set_drvdata(pdev, mbc); | |
68d641ef | 381 | mbc->pcf = dev_to_pcf50633(pdev->dev.parent); |
f5714dc9 BR |
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 | ||
7677f33f SM |
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 | ||
f5714dc9 BR |
413 | ret = power_supply_register(&pdev->dev, &mbc->adapter); |
414 | if (ret) { | |
415 | dev_err(mbc->pcf->dev, "failed to register adapter\n"); | |
416 | kfree(mbc); | |
417 | return ret; | |
418 | } | |
419 | ||
420 | ret = power_supply_register(&pdev->dev, &mbc->usb); | |
421 | if (ret) { | |
422 | dev_err(mbc->pcf->dev, "failed to register usb\n"); | |
423 | power_supply_unregister(&mbc->adapter); | |
424 | kfree(mbc); | |
425 | return ret; | |
426 | } | |
427 | ||
7677f33f SM |
428 | ret = power_supply_register(&pdev->dev, &mbc->ac); |
429 | if (ret) { | |
430 | dev_err(mbc->pcf->dev, "failed to register ac\n"); | |
431 | power_supply_unregister(&mbc->adapter); | |
432 | power_supply_unregister(&mbc->usb); | |
433 | kfree(mbc); | |
434 | return ret; | |
435 | } | |
9705ecc5 | 436 | |
f5714dc9 BR |
437 | ret = sysfs_create_group(&pdev->dev.kobj, &mbc_attr_group); |
438 | if (ret) | |
439 | dev_err(mbc->pcf->dev, "failed to create sysfs entries\n"); | |
440 | ||
441 | mbcs1 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS1); | |
442 | if (mbcs1 & PCF50633_MBCS1_USBPRES) | |
443 | pcf50633_mbc_irq_handler(PCF50633_IRQ_USBINS, mbc); | |
444 | if (mbcs1 & PCF50633_MBCS1_ADAPTPRES) | |
445 | pcf50633_mbc_irq_handler(PCF50633_IRQ_ADPINS, mbc); | |
446 | ||
447 | return 0; | |
448 | } | |
449 | ||
450 | static int __devexit pcf50633_mbc_remove(struct platform_device *pdev) | |
451 | { | |
452 | struct pcf50633_mbc *mbc = platform_get_drvdata(pdev); | |
453 | int i; | |
454 | ||
455 | /* Remove IRQ handlers */ | |
456 | for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++) | |
457 | pcf50633_free_irq(mbc->pcf, mbc_irq_handlers[i]); | |
458 | ||
305da8f5 | 459 | sysfs_remove_group(&pdev->dev.kobj, &mbc_attr_group); |
f5714dc9 BR |
460 | power_supply_unregister(&mbc->usb); |
461 | power_supply_unregister(&mbc->adapter); | |
7677f33f | 462 | power_supply_unregister(&mbc->ac); |
9705ecc5 | 463 | |
f5714dc9 BR |
464 | kfree(mbc); |
465 | ||
466 | return 0; | |
467 | } | |
468 | ||
469 | static struct platform_driver pcf50633_mbc_driver = { | |
470 | .driver = { | |
471 | .name = "pcf50633-mbc", | |
472 | }, | |
473 | .probe = pcf50633_mbc_probe, | |
474 | .remove = __devexit_p(pcf50633_mbc_remove), | |
475 | }; | |
476 | ||
300bac7f | 477 | module_platform_driver(pcf50633_mbc_driver); |
f5714dc9 BR |
478 | |
479 | MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>"); | |
480 | MODULE_DESCRIPTION("PCF50633 mbc driver"); | |
481 | MODULE_LICENSE("GPL"); | |
482 | MODULE_ALIAS("platform:pcf50633-mbc"); |