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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> | |
19 | #include <linux/init.h> | |
20 | #include <linux/types.h> | |
21 | #include <linux/device.h> | |
22 | #include <linux/sysfs.h> | |
23 | #include <linux/platform_device.h> | |
24 | #include <linux/power_supply.h> | |
25 | ||
26 | #include <linux/mfd/pcf50633/core.h> | |
27 | #include <linux/mfd/pcf50633/mbc.h> | |
28 | ||
29 | struct pcf50633_mbc { | |
30 | struct pcf50633 *pcf; | |
31 | ||
32 | int adapter_active; | |
33 | int adapter_online; | |
34 | int usb_active; | |
35 | int usb_online; | |
36 | ||
37 | struct power_supply usb; | |
38 | struct power_supply adapter; | |
9705ecc5 BR |
39 | |
40 | struct delayed_work charging_restart_work; | |
f5714dc9 BR |
41 | }; |
42 | ||
43 | int pcf50633_mbc_usb_curlim_set(struct pcf50633 *pcf, int ma) | |
44 | { | |
45 | struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev); | |
46 | int ret = 0; | |
47 | u8 bits; | |
9705ecc5 BR |
48 | int charging_start = 1; |
49 | u8 mbcs2, chgmod; | |
f5714dc9 BR |
50 | |
51 | if (ma >= 1000) | |
52 | bits = PCF50633_MBCC7_USB_1000mA; | |
53 | else if (ma >= 500) | |
54 | bits = PCF50633_MBCC7_USB_500mA; | |
55 | else if (ma >= 100) | |
56 | bits = PCF50633_MBCC7_USB_100mA; | |
9705ecc5 | 57 | else { |
f5714dc9 | 58 | bits = PCF50633_MBCC7_USB_SUSPEND; |
9705ecc5 BR |
59 | charging_start = 0; |
60 | } | |
f5714dc9 BR |
61 | |
62 | ret = pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC7, | |
63 | PCF50633_MBCC7_USB_MASK, bits); | |
64 | if (ret) | |
65 | dev_err(pcf->dev, "error setting usb curlim to %d mA\n", ma); | |
66 | else | |
67 | dev_info(pcf->dev, "usb curlim to %d mA\n", ma); | |
68 | ||
9705ecc5 BR |
69 | /* Manual charging start */ |
70 | mbcs2 = pcf50633_reg_read(pcf, PCF50633_REG_MBCS2); | |
71 | chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK); | |
72 | ||
73 | /* If chgmod == BATFULL, setting chgena has no effect. | |
74 | * We need to set resume instead. | |
75 | */ | |
76 | if (chgmod != PCF50633_MBCS2_MBC_BAT_FULL) | |
77 | pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC1, | |
78 | PCF50633_MBCC1_CHGENA, PCF50633_MBCC1_CHGENA); | |
79 | else | |
80 | pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC1, | |
81 | PCF50633_MBCC1_RESUME, PCF50633_MBCC1_RESUME); | |
82 | ||
83 | mbc->usb_active = charging_start; | |
84 | ||
f5714dc9 BR |
85 | power_supply_changed(&mbc->usb); |
86 | ||
87 | return ret; | |
88 | } | |
89 | EXPORT_SYMBOL_GPL(pcf50633_mbc_usb_curlim_set); | |
90 | ||
91 | int pcf50633_mbc_get_status(struct pcf50633 *pcf) | |
92 | { | |
93 | struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev); | |
94 | int status = 0; | |
95 | ||
96 | if (mbc->usb_online) | |
97 | status |= PCF50633_MBC_USB_ONLINE; | |
98 | if (mbc->usb_active) | |
99 | status |= PCF50633_MBC_USB_ACTIVE; | |
100 | if (mbc->adapter_online) | |
101 | status |= PCF50633_MBC_ADAPTER_ONLINE; | |
102 | if (mbc->adapter_active) | |
103 | status |= PCF50633_MBC_ADAPTER_ACTIVE; | |
104 | ||
105 | return status; | |
106 | } | |
107 | EXPORT_SYMBOL_GPL(pcf50633_mbc_get_status); | |
108 | ||
f5714dc9 BR |
109 | static ssize_t |
110 | show_chgmode(struct device *dev, struct device_attribute *attr, char *buf) | |
111 | { | |
112 | struct pcf50633_mbc *mbc = dev_get_drvdata(dev); | |
113 | ||
114 | u8 mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2); | |
115 | u8 chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK); | |
116 | ||
117 | return sprintf(buf, "%d\n", chgmod); | |
118 | } | |
119 | static DEVICE_ATTR(chgmode, S_IRUGO, show_chgmode, NULL); | |
120 | ||
121 | static ssize_t | |
122 | show_usblim(struct device *dev, struct device_attribute *attr, char *buf) | |
123 | { | |
124 | struct pcf50633_mbc *mbc = dev_get_drvdata(dev); | |
125 | u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) & | |
126 | PCF50633_MBCC7_USB_MASK; | |
127 | unsigned int ma; | |
128 | ||
129 | if (usblim == PCF50633_MBCC7_USB_1000mA) | |
130 | ma = 1000; | |
131 | else if (usblim == PCF50633_MBCC7_USB_500mA) | |
132 | ma = 500; | |
133 | else if (usblim == PCF50633_MBCC7_USB_100mA) | |
134 | ma = 100; | |
135 | else | |
136 | ma = 0; | |
137 | ||
138 | return sprintf(buf, "%u\n", ma); | |
139 | } | |
140 | ||
141 | static ssize_t set_usblim(struct device *dev, | |
142 | struct device_attribute *attr, const char *buf, size_t count) | |
143 | { | |
144 | struct pcf50633_mbc *mbc = dev_get_drvdata(dev); | |
145 | unsigned long ma; | |
146 | int ret; | |
147 | ||
148 | ret = strict_strtoul(buf, 10, &ma); | |
149 | if (ret) | |
150 | return -EINVAL; | |
151 | ||
152 | pcf50633_mbc_usb_curlim_set(mbc->pcf, ma); | |
153 | ||
154 | return count; | |
155 | } | |
156 | ||
157 | static DEVICE_ATTR(usb_curlim, S_IRUGO | S_IWUSR, show_usblim, set_usblim); | |
158 | ||
159 | static struct attribute *pcf50633_mbc_sysfs_entries[] = { | |
160 | &dev_attr_chgmode.attr, | |
161 | &dev_attr_usb_curlim.attr, | |
162 | NULL, | |
163 | }; | |
164 | ||
165 | static struct attribute_group mbc_attr_group = { | |
166 | .name = NULL, /* put in device directory */ | |
167 | .attrs = pcf50633_mbc_sysfs_entries, | |
168 | }; | |
169 | ||
9705ecc5 BR |
170 | /* MBC state machine switches into charging mode when the battery voltage |
171 | * falls below 96% of a battery float voltage. But the voltage drop in Li-ion | |
172 | * batteries is marginal(1~2 %) till about 80% of its capacity - which means, | |
173 | * after a BATFULL, charging won't be restarted until 80%. | |
174 | * | |
175 | * This work_struct function restarts charging at regular intervals to make | |
176 | * sure we don't discharge too much | |
177 | */ | |
178 | ||
179 | static void pcf50633_mbc_charging_restart(struct work_struct *work) | |
180 | { | |
181 | struct pcf50633_mbc *mbc; | |
182 | u8 mbcs2, chgmod; | |
183 | ||
184 | mbc = container_of(work, struct pcf50633_mbc, | |
185 | charging_restart_work.work); | |
186 | ||
187 | mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2); | |
188 | chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK); | |
189 | ||
190 | if (chgmod != PCF50633_MBCS2_MBC_BAT_FULL) | |
191 | return; | |
192 | ||
193 | /* Restart charging */ | |
194 | pcf50633_reg_set_bit_mask(mbc->pcf, PCF50633_REG_MBCC1, | |
195 | PCF50633_MBCC1_RESUME, PCF50633_MBCC1_RESUME); | |
196 | mbc->usb_active = 1; | |
197 | power_supply_changed(&mbc->usb); | |
198 | ||
199 | dev_info(mbc->pcf->dev, "Charging restarted\n"); | |
200 | } | |
201 | ||
f5714dc9 BR |
202 | static void |
203 | pcf50633_mbc_irq_handler(int irq, void *data) | |
204 | { | |
205 | struct pcf50633_mbc *mbc = data; | |
9705ecc5 BR |
206 | int chg_restart_interval = |
207 | mbc->pcf->pdata->charging_restart_interval; | |
f5714dc9 BR |
208 | |
209 | /* USB */ | |
210 | if (irq == PCF50633_IRQ_USBINS) { | |
211 | mbc->usb_online = 1; | |
212 | } else if (irq == PCF50633_IRQ_USBREM) { | |
213 | mbc->usb_online = 0; | |
214 | mbc->usb_active = 0; | |
215 | pcf50633_mbc_usb_curlim_set(mbc->pcf, 0); | |
9705ecc5 | 216 | cancel_delayed_work_sync(&mbc->charging_restart_work); |
f5714dc9 BR |
217 | } |
218 | ||
219 | /* Adapter */ | |
220 | if (irq == PCF50633_IRQ_ADPINS) { | |
221 | mbc->adapter_online = 1; | |
222 | mbc->adapter_active = 1; | |
223 | } else if (irq == PCF50633_IRQ_ADPREM) { | |
224 | mbc->adapter_online = 0; | |
225 | mbc->adapter_active = 0; | |
226 | } | |
227 | ||
228 | if (irq == PCF50633_IRQ_BATFULL) { | |
229 | mbc->usb_active = 0; | |
230 | mbc->adapter_active = 0; | |
9705ecc5 BR |
231 | |
232 | if (chg_restart_interval > 0) | |
233 | schedule_delayed_work(&mbc->charging_restart_work, | |
234 | chg_restart_interval); | |
235 | } else if (irq == PCF50633_IRQ_USBLIMON) | |
236 | mbc->usb_active = 0; | |
237 | else if (irq == PCF50633_IRQ_USBLIMOFF) | |
238 | mbc->usb_active = 1; | |
f5714dc9 BR |
239 | |
240 | power_supply_changed(&mbc->usb); | |
241 | power_supply_changed(&mbc->adapter); | |
242 | ||
243 | if (mbc->pcf->pdata->mbc_event_callback) | |
244 | mbc->pcf->pdata->mbc_event_callback(mbc->pcf, irq); | |
245 | } | |
246 | ||
247 | static int adapter_get_property(struct power_supply *psy, | |
248 | enum power_supply_property psp, | |
249 | union power_supply_propval *val) | |
250 | { | |
ccc9c8b9 BR |
251 | struct pcf50633_mbc *mbc = container_of(psy, |
252 | struct pcf50633_mbc, adapter); | |
f5714dc9 BR |
253 | int ret = 0; |
254 | ||
255 | switch (psp) { | |
256 | case POWER_SUPPLY_PROP_ONLINE: | |
257 | val->intval = mbc->adapter_online; | |
258 | break; | |
259 | default: | |
260 | ret = -EINVAL; | |
261 | break; | |
262 | } | |
263 | return ret; | |
264 | } | |
265 | ||
266 | static int usb_get_property(struct power_supply *psy, | |
267 | enum power_supply_property psp, | |
268 | union power_supply_propval *val) | |
269 | { | |
270 | struct pcf50633_mbc *mbc = container_of(psy, struct pcf50633_mbc, usb); | |
271 | int ret = 0; | |
272 | ||
273 | switch (psp) { | |
274 | case POWER_SUPPLY_PROP_ONLINE: | |
275 | val->intval = mbc->usb_online; | |
276 | break; | |
277 | default: | |
278 | ret = -EINVAL; | |
279 | break; | |
280 | } | |
281 | return ret; | |
282 | } | |
283 | ||
284 | static enum power_supply_property power_props[] = { | |
285 | POWER_SUPPLY_PROP_ONLINE, | |
286 | }; | |
287 | ||
288 | static const u8 mbc_irq_handlers[] = { | |
289 | PCF50633_IRQ_ADPINS, | |
290 | PCF50633_IRQ_ADPREM, | |
291 | PCF50633_IRQ_USBINS, | |
292 | PCF50633_IRQ_USBREM, | |
293 | PCF50633_IRQ_BATFULL, | |
294 | PCF50633_IRQ_CHGHALT, | |
295 | PCF50633_IRQ_THLIMON, | |
296 | PCF50633_IRQ_THLIMOFF, | |
297 | PCF50633_IRQ_USBLIMON, | |
298 | PCF50633_IRQ_USBLIMOFF, | |
299 | PCF50633_IRQ_LOWSYS, | |
300 | PCF50633_IRQ_LOWBAT, | |
301 | }; | |
302 | ||
303 | static int __devinit pcf50633_mbc_probe(struct platform_device *pdev) | |
304 | { | |
305 | struct pcf50633_mbc *mbc; | |
306 | struct pcf50633_subdev_pdata *pdata = pdev->dev.platform_data; | |
307 | int ret; | |
308 | int i; | |
309 | u8 mbcs1; | |
310 | ||
311 | mbc = kzalloc(sizeof(*mbc), GFP_KERNEL); | |
312 | if (!mbc) | |
313 | return -ENOMEM; | |
314 | ||
315 | platform_set_drvdata(pdev, mbc); | |
316 | mbc->pcf = pdata->pcf; | |
317 | ||
318 | /* Set up IRQ handlers */ | |
319 | for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++) | |
320 | pcf50633_register_irq(mbc->pcf, mbc_irq_handlers[i], | |
321 | pcf50633_mbc_irq_handler, mbc); | |
322 | ||
323 | /* Create power supplies */ | |
324 | mbc->adapter.name = "adapter"; | |
325 | mbc->adapter.type = POWER_SUPPLY_TYPE_MAINS; | |
326 | mbc->adapter.properties = power_props; | |
327 | mbc->adapter.num_properties = ARRAY_SIZE(power_props); | |
328 | mbc->adapter.get_property = &adapter_get_property; | |
329 | mbc->adapter.supplied_to = mbc->pcf->pdata->batteries; | |
330 | mbc->adapter.num_supplicants = mbc->pcf->pdata->num_batteries; | |
331 | ||
332 | mbc->usb.name = "usb"; | |
333 | mbc->usb.type = POWER_SUPPLY_TYPE_USB; | |
334 | mbc->usb.properties = power_props; | |
335 | mbc->usb.num_properties = ARRAY_SIZE(power_props); | |
336 | mbc->usb.get_property = usb_get_property; | |
337 | mbc->usb.supplied_to = mbc->pcf->pdata->batteries; | |
338 | mbc->usb.num_supplicants = mbc->pcf->pdata->num_batteries; | |
339 | ||
340 | ret = power_supply_register(&pdev->dev, &mbc->adapter); | |
341 | if (ret) { | |
342 | dev_err(mbc->pcf->dev, "failed to register adapter\n"); | |
343 | kfree(mbc); | |
344 | return ret; | |
345 | } | |
346 | ||
347 | ret = power_supply_register(&pdev->dev, &mbc->usb); | |
348 | if (ret) { | |
349 | dev_err(mbc->pcf->dev, "failed to register usb\n"); | |
350 | power_supply_unregister(&mbc->adapter); | |
351 | kfree(mbc); | |
352 | return ret; | |
353 | } | |
354 | ||
9705ecc5 BR |
355 | INIT_DELAYED_WORK(&mbc->charging_restart_work, |
356 | pcf50633_mbc_charging_restart); | |
357 | ||
f5714dc9 BR |
358 | ret = sysfs_create_group(&pdev->dev.kobj, &mbc_attr_group); |
359 | if (ret) | |
360 | dev_err(mbc->pcf->dev, "failed to create sysfs entries\n"); | |
361 | ||
362 | mbcs1 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS1); | |
363 | if (mbcs1 & PCF50633_MBCS1_USBPRES) | |
364 | pcf50633_mbc_irq_handler(PCF50633_IRQ_USBINS, mbc); | |
365 | if (mbcs1 & PCF50633_MBCS1_ADAPTPRES) | |
366 | pcf50633_mbc_irq_handler(PCF50633_IRQ_ADPINS, mbc); | |
367 | ||
368 | return 0; | |
369 | } | |
370 | ||
371 | static int __devexit pcf50633_mbc_remove(struct platform_device *pdev) | |
372 | { | |
373 | struct pcf50633_mbc *mbc = platform_get_drvdata(pdev); | |
374 | int i; | |
375 | ||
376 | /* Remove IRQ handlers */ | |
377 | for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++) | |
378 | pcf50633_free_irq(mbc->pcf, mbc_irq_handlers[i]); | |
379 | ||
380 | power_supply_unregister(&mbc->usb); | |
381 | power_supply_unregister(&mbc->adapter); | |
382 | ||
9705ecc5 BR |
383 | cancel_delayed_work_sync(&mbc->charging_restart_work); |
384 | ||
f5714dc9 BR |
385 | kfree(mbc); |
386 | ||
387 | return 0; | |
388 | } | |
389 | ||
390 | static struct platform_driver pcf50633_mbc_driver = { | |
391 | .driver = { | |
392 | .name = "pcf50633-mbc", | |
393 | }, | |
394 | .probe = pcf50633_mbc_probe, | |
395 | .remove = __devexit_p(pcf50633_mbc_remove), | |
396 | }; | |
397 | ||
398 | static int __init pcf50633_mbc_init(void) | |
399 | { | |
400 | return platform_driver_register(&pcf50633_mbc_driver); | |
401 | } | |
402 | module_init(pcf50633_mbc_init); | |
403 | ||
404 | static void __exit pcf50633_mbc_exit(void) | |
405 | { | |
406 | platform_driver_unregister(&pcf50633_mbc_driver); | |
407 | } | |
408 | module_exit(pcf50633_mbc_exit); | |
409 | ||
410 | MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>"); | |
411 | MODULE_DESCRIPTION("PCF50633 mbc driver"); | |
412 | MODULE_LICENSE("GPL"); | |
413 | MODULE_ALIAS("platform:pcf50633-mbc"); |