1 /* NXP PCF50633 Main Battery Charger Driver
3 * (C) 2006-2008 by Openmoko, Inc.
4 * Author: Balaji Rao <balajirrao@openmoko.org>
7 * Broken down from monstrous PCF50633 driver mainly by
8 * Harald Welte, Andy Green and Werner Almesberger
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.
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>
26 #include <linux/mfd/pcf50633/core.h>
27 #include <linux/mfd/pcf50633/mbc.h>
37 struct power_supply usb;
38 struct power_supply adapter;
39 struct power_supply ac;
41 struct delayed_work charging_restart_work;
44 int pcf50633_mbc_usb_curlim_set(struct pcf50633 *pcf, int ma)
46 struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev);
49 int charging_start = 1;
53 bits = PCF50633_MBCC7_USB_1000mA;
55 bits = PCF50633_MBCC7_USB_500mA;
57 bits = PCF50633_MBCC7_USB_100mA;
59 bits = PCF50633_MBCC7_USB_SUSPEND;
63 ret = pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC7,
64 PCF50633_MBCC7_USB_MASK, bits);
66 dev_err(pcf->dev, "error setting usb curlim to %d mA\n", ma);
68 dev_info(pcf->dev, "usb curlim to %d mA\n", ma);
70 /* Manual charging start */
71 mbcs2 = pcf50633_reg_read(pcf, PCF50633_REG_MBCS2);
72 chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK);
74 /* If chgmod == BATFULL, setting chgena has no effect.
75 * We need to set resume instead.
77 if (chgmod != PCF50633_MBCS2_MBC_BAT_FULL)
78 pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC1,
79 PCF50633_MBCC1_CHGENA, PCF50633_MBCC1_CHGENA);
81 pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC1,
82 PCF50633_MBCC1_RESUME, PCF50633_MBCC1_RESUME);
84 mbc->usb_active = charging_start;
86 power_supply_changed(&mbc->usb);
90 EXPORT_SYMBOL_GPL(pcf50633_mbc_usb_curlim_set);
92 int pcf50633_mbc_get_status(struct pcf50633 *pcf)
94 struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev);
98 status |= PCF50633_MBC_USB_ONLINE;
100 status |= PCF50633_MBC_USB_ACTIVE;
101 if (mbc->adapter_online)
102 status |= PCF50633_MBC_ADAPTER_ONLINE;
103 if (mbc->adapter_active)
104 status |= PCF50633_MBC_ADAPTER_ACTIVE;
108 EXPORT_SYMBOL_GPL(pcf50633_mbc_get_status);
111 show_chgmode(struct device *dev, struct device_attribute *attr, char *buf)
113 struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
115 u8 mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2);
116 u8 chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK);
118 return sprintf(buf, "%d\n", chgmod);
120 static DEVICE_ATTR(chgmode, S_IRUGO, show_chgmode, NULL);
123 show_usblim(struct device *dev, struct device_attribute *attr, char *buf)
125 struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
126 u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
127 PCF50633_MBCC7_USB_MASK;
130 if (usblim == PCF50633_MBCC7_USB_1000mA)
132 else if (usblim == PCF50633_MBCC7_USB_500mA)
134 else if (usblim == PCF50633_MBCC7_USB_100mA)
139 return sprintf(buf, "%u\n", ma);
142 static ssize_t set_usblim(struct device *dev,
143 struct device_attribute *attr, const char *buf, size_t count)
145 struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
149 ret = strict_strtoul(buf, 10, &ma);
153 pcf50633_mbc_usb_curlim_set(mbc->pcf, ma);
158 static DEVICE_ATTR(usb_curlim, S_IRUGO | S_IWUSR, show_usblim, set_usblim);
160 static struct attribute *pcf50633_mbc_sysfs_entries[] = {
161 &dev_attr_chgmode.attr,
162 &dev_attr_usb_curlim.attr,
166 static struct attribute_group mbc_attr_group = {
167 .name = NULL, /* put in device directory */
168 .attrs = pcf50633_mbc_sysfs_entries,
171 /* MBC state machine switches into charging mode when the battery voltage
172 * falls below 96% of a battery float voltage. But the voltage drop in Li-ion
173 * batteries is marginal(1~2 %) till about 80% of its capacity - which means,
174 * after a BATFULL, charging won't be restarted until 80%.
176 * This work_struct function restarts charging at regular intervals to make
177 * sure we don't discharge too much
180 static void pcf50633_mbc_charging_restart(struct work_struct *work)
182 struct pcf50633_mbc *mbc;
185 mbc = container_of(work, struct pcf50633_mbc,
186 charging_restart_work.work);
188 mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2);
189 chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK);
191 if (chgmod != PCF50633_MBCS2_MBC_BAT_FULL)
194 /* Restart charging */
195 pcf50633_reg_set_bit_mask(mbc->pcf, PCF50633_REG_MBCC1,
196 PCF50633_MBCC1_RESUME, PCF50633_MBCC1_RESUME);
198 power_supply_changed(&mbc->usb);
200 dev_info(mbc->pcf->dev, "Charging restarted\n");
204 pcf50633_mbc_irq_handler(int irq, void *data)
206 struct pcf50633_mbc *mbc = data;
207 int chg_restart_interval =
208 mbc->pcf->pdata->charging_restart_interval;
211 if (irq == PCF50633_IRQ_USBINS) {
213 } else if (irq == PCF50633_IRQ_USBREM) {
216 pcf50633_mbc_usb_curlim_set(mbc->pcf, 0);
217 cancel_delayed_work_sync(&mbc->charging_restart_work);
221 if (irq == PCF50633_IRQ_ADPINS) {
222 mbc->adapter_online = 1;
223 mbc->adapter_active = 1;
224 } else if (irq == PCF50633_IRQ_ADPREM) {
225 mbc->adapter_online = 0;
226 mbc->adapter_active = 0;
229 if (irq == PCF50633_IRQ_BATFULL) {
231 mbc->adapter_active = 0;
233 if (chg_restart_interval > 0)
234 schedule_delayed_work(&mbc->charging_restart_work,
235 chg_restart_interval);
236 } else if (irq == PCF50633_IRQ_USBLIMON)
238 else if (irq == PCF50633_IRQ_USBLIMOFF)
241 power_supply_changed(&mbc->ac);
242 power_supply_changed(&mbc->usb);
243 power_supply_changed(&mbc->adapter);
245 if (mbc->pcf->pdata->mbc_event_callback)
246 mbc->pcf->pdata->mbc_event_callback(mbc->pcf, irq);
249 static int adapter_get_property(struct power_supply *psy,
250 enum power_supply_property psp,
251 union power_supply_propval *val)
253 struct pcf50633_mbc *mbc = container_of(psy,
254 struct pcf50633_mbc, adapter);
258 case POWER_SUPPLY_PROP_ONLINE:
259 val->intval = mbc->adapter_online;
268 static int usb_get_property(struct power_supply *psy,
269 enum power_supply_property psp,
270 union power_supply_propval *val)
272 struct pcf50633_mbc *mbc = container_of(psy, struct pcf50633_mbc, usb);
274 u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
275 PCF50633_MBCC7_USB_MASK;
278 case POWER_SUPPLY_PROP_ONLINE:
279 val->intval = mbc->usb_online &&
280 (usblim <= PCF50633_MBCC7_USB_500mA);
289 static int ac_get_property(struct power_supply *psy,
290 enum power_supply_property psp,
291 union power_supply_propval *val)
293 struct pcf50633_mbc *mbc = container_of(psy, struct pcf50633_mbc, ac);
295 u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
296 PCF50633_MBCC7_USB_MASK;
299 case POWER_SUPPLY_PROP_ONLINE:
300 val->intval = mbc->usb_online &&
301 (usblim == PCF50633_MBCC7_USB_1000mA);
310 static enum power_supply_property power_props[] = {
311 POWER_SUPPLY_PROP_ONLINE,
314 static const u8 mbc_irq_handlers[] = {
319 PCF50633_IRQ_BATFULL,
320 PCF50633_IRQ_CHGHALT,
321 PCF50633_IRQ_THLIMON,
322 PCF50633_IRQ_THLIMOFF,
323 PCF50633_IRQ_USBLIMON,
324 PCF50633_IRQ_USBLIMOFF,
329 static int __devinit pcf50633_mbc_probe(struct platform_device *pdev)
331 struct pcf50633_mbc *mbc;
332 struct pcf50633_subdev_pdata *pdata = pdev->dev.platform_data;
337 mbc = kzalloc(sizeof(*mbc), GFP_KERNEL);
341 platform_set_drvdata(pdev, mbc);
342 mbc->pcf = pdata->pcf;
344 /* Set up IRQ handlers */
345 for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++)
346 pcf50633_register_irq(mbc->pcf, mbc_irq_handlers[i],
347 pcf50633_mbc_irq_handler, mbc);
349 /* Create power supplies */
350 mbc->adapter.name = "adapter";
351 mbc->adapter.type = POWER_SUPPLY_TYPE_MAINS;
352 mbc->adapter.properties = power_props;
353 mbc->adapter.num_properties = ARRAY_SIZE(power_props);
354 mbc->adapter.get_property = &adapter_get_property;
355 mbc->adapter.supplied_to = mbc->pcf->pdata->batteries;
356 mbc->adapter.num_supplicants = mbc->pcf->pdata->num_batteries;
358 mbc->usb.name = "usb";
359 mbc->usb.type = POWER_SUPPLY_TYPE_USB;
360 mbc->usb.properties = power_props;
361 mbc->usb.num_properties = ARRAY_SIZE(power_props);
362 mbc->usb.get_property = usb_get_property;
363 mbc->usb.supplied_to = mbc->pcf->pdata->batteries;
364 mbc->usb.num_supplicants = mbc->pcf->pdata->num_batteries;
367 mbc->ac.type = POWER_SUPPLY_TYPE_MAINS;
368 mbc->ac.properties = power_props;
369 mbc->ac.num_properties = ARRAY_SIZE(power_props);
370 mbc->ac.get_property = ac_get_property;
371 mbc->ac.supplied_to = mbc->pcf->pdata->batteries;
372 mbc->ac.num_supplicants = mbc->pcf->pdata->num_batteries;
374 ret = power_supply_register(&pdev->dev, &mbc->adapter);
376 dev_err(mbc->pcf->dev, "failed to register adapter\n");
381 ret = power_supply_register(&pdev->dev, &mbc->usb);
383 dev_err(mbc->pcf->dev, "failed to register usb\n");
384 power_supply_unregister(&mbc->adapter);
389 ret = power_supply_register(&pdev->dev, &mbc->ac);
391 dev_err(mbc->pcf->dev, "failed to register ac\n");
392 power_supply_unregister(&mbc->adapter);
393 power_supply_unregister(&mbc->usb);
398 INIT_DELAYED_WORK(&mbc->charging_restart_work,
399 pcf50633_mbc_charging_restart);
401 ret = sysfs_create_group(&pdev->dev.kobj, &mbc_attr_group);
403 dev_err(mbc->pcf->dev, "failed to create sysfs entries\n");
405 mbcs1 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS1);
406 if (mbcs1 & PCF50633_MBCS1_USBPRES)
407 pcf50633_mbc_irq_handler(PCF50633_IRQ_USBINS, mbc);
408 if (mbcs1 & PCF50633_MBCS1_ADAPTPRES)
409 pcf50633_mbc_irq_handler(PCF50633_IRQ_ADPINS, mbc);
414 static int __devexit pcf50633_mbc_remove(struct platform_device *pdev)
416 struct pcf50633_mbc *mbc = platform_get_drvdata(pdev);
419 /* Remove IRQ handlers */
420 for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++)
421 pcf50633_free_irq(mbc->pcf, mbc_irq_handlers[i]);
423 power_supply_unregister(&mbc->usb);
424 power_supply_unregister(&mbc->adapter);
425 power_supply_unregister(&mbc->ac);
427 cancel_delayed_work_sync(&mbc->charging_restart_work);
434 static struct platform_driver pcf50633_mbc_driver = {
436 .name = "pcf50633-mbc",
438 .probe = pcf50633_mbc_probe,
439 .remove = __devexit_p(pcf50633_mbc_remove),
442 static int __init pcf50633_mbc_init(void)
444 return platform_driver_register(&pcf50633_mbc_driver);
446 module_init(pcf50633_mbc_init);
448 static void __exit pcf50633_mbc_exit(void)
450 platform_driver_unregister(&pcf50633_mbc_driver);
452 module_exit(pcf50633_mbc_exit);
454 MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
455 MODULE_DESCRIPTION("PCF50633 mbc driver");
456 MODULE_LICENSE("GPL");
457 MODULE_ALIAS("platform:pcf50633-mbc");