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/slab.h>
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>
27 #include <linux/mfd/pcf50633/core.h>
28 #include <linux/mfd/pcf50633/mbc.h>
36 struct power_supply usb;
37 struct power_supply adapter;
38 struct power_supply ac;
41 int pcf50633_mbc_usb_curlim_set(struct pcf50633 *pcf, int ma)
43 struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev);
46 int charging_start = 1;
51 bits = PCF50633_MBCC7_USB_1000mA;
53 } else if (ma >= 500) {
54 bits = PCF50633_MBCC7_USB_500mA;
56 } else if (ma >= 100) {
57 bits = PCF50633_MBCC7_USB_100mA;
60 bits = PCF50633_MBCC7_USB_SUSPEND;
65 ret = pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC7,
66 PCF50633_MBCC7_USB_MASK, bits);
68 dev_err(pcf->dev, "error setting usb curlim to %d mA\n", ma);
70 dev_info(pcf->dev, "usb curlim to %d mA\n", ma);
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
83 if (mbc->pcf->pdata->charger_reference_current_ma) {
84 mbcc5 = (ma << 8) / mbc->pcf->pdata->charger_reference_current_ma;
87 pcf50633_reg_write(mbc->pcf, PCF50633_REG_MBCC5, mbcc5);
90 mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2);
91 chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK);
93 /* If chgmod == BATFULL, setting chgena has no effect.
94 * Datasheet says we need to set resume instead but when autoresume is
95 * used resume doesn't work. Clear and set chgena instead.
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);
101 pcf50633_reg_clear_bits(pcf, PCF50633_REG_MBCC1,
102 PCF50633_MBCC1_CHGENA);
103 pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC1,
104 PCF50633_MBCC1_CHGENA, PCF50633_MBCC1_CHGENA);
107 power_supply_changed(&mbc->usb);
111 EXPORT_SYMBOL_GPL(pcf50633_mbc_usb_curlim_set);
113 int pcf50633_mbc_get_status(struct pcf50633 *pcf)
115 struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev);
122 chgmod = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2)
123 & PCF50633_MBCS2_MBC_MASK;
126 status |= PCF50633_MBC_USB_ONLINE;
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)
131 status |= PCF50633_MBC_USB_ACTIVE;
132 if (mbc->adapter_online)
133 status |= PCF50633_MBC_ADAPTER_ONLINE;
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)
138 status |= PCF50633_MBC_ADAPTER_ACTIVE;
142 EXPORT_SYMBOL_GPL(pcf50633_mbc_get_status);
144 int pcf50633_mbc_get_usb_online_status(struct pcf50633 *pcf)
146 struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev);
151 return mbc->usb_online;
153 EXPORT_SYMBOL_GPL(pcf50633_mbc_get_usb_online_status);
156 show_chgmode(struct device *dev, struct device_attribute *attr, char *buf)
158 struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
160 u8 mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2);
161 u8 chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK);
163 return sprintf(buf, "%d\n", chgmod);
165 static DEVICE_ATTR(chgmode, S_IRUGO, show_chgmode, NULL);
168 show_usblim(struct device *dev, struct device_attribute *attr, char *buf)
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;
175 if (usblim == PCF50633_MBCC7_USB_1000mA)
177 else if (usblim == PCF50633_MBCC7_USB_500mA)
179 else if (usblim == PCF50633_MBCC7_USB_100mA)
184 return sprintf(buf, "%u\n", ma);
187 static ssize_t set_usblim(struct device *dev,
188 struct device_attribute *attr, const char *buf, size_t count)
190 struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
194 ret = strict_strtoul(buf, 10, &ma);
198 pcf50633_mbc_usb_curlim_set(mbc->pcf, ma);
203 static DEVICE_ATTR(usb_curlim, S_IRUGO | S_IWUSR, show_usblim, set_usblim);
206 show_chglim(struct device *dev, struct device_attribute *attr, char *buf)
208 struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
209 u8 mbcc5 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC5);
212 if (!mbc->pcf->pdata->charger_reference_current_ma)
215 ma = (mbc->pcf->pdata->charger_reference_current_ma * mbcc5) >> 8;
217 return sprintf(buf, "%u\n", ma);
220 static ssize_t set_chglim(struct device *dev,
221 struct device_attribute *attr, const char *buf, size_t count)
223 struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
228 if (!mbc->pcf->pdata->charger_reference_current_ma)
231 ret = strict_strtoul(buf, 10, &ma);
235 mbcc5 = (ma << 8) / mbc->pcf->pdata->charger_reference_current_ma;
238 pcf50633_reg_write(mbc->pcf, PCF50633_REG_MBCC5, mbcc5);
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.
248 static DEVICE_ATTR(chg_curlim, S_IRUGO | S_IWUSR, show_chglim, set_chglim);
250 static struct attribute *pcf50633_mbc_sysfs_entries[] = {
251 &dev_attr_chgmode.attr,
252 &dev_attr_usb_curlim.attr,
253 &dev_attr_chg_curlim.attr,
257 static struct attribute_group mbc_attr_group = {
258 .name = NULL, /* put in device directory */
259 .attrs = pcf50633_mbc_sysfs_entries,
263 pcf50633_mbc_irq_handler(int irq, void *data)
265 struct pcf50633_mbc *mbc = data;
268 if (irq == PCF50633_IRQ_USBINS) {
270 } else if (irq == PCF50633_IRQ_USBREM) {
272 pcf50633_mbc_usb_curlim_set(mbc->pcf, 0);
276 if (irq == PCF50633_IRQ_ADPINS)
277 mbc->adapter_online = 1;
278 else if (irq == PCF50633_IRQ_ADPREM)
279 mbc->adapter_online = 0;
281 power_supply_changed(&mbc->ac);
282 power_supply_changed(&mbc->usb);
283 power_supply_changed(&mbc->adapter);
285 if (mbc->pcf->pdata->mbc_event_callback)
286 mbc->pcf->pdata->mbc_event_callback(mbc->pcf, irq);
289 static int adapter_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,
294 struct pcf50633_mbc, adapter);
298 case POWER_SUPPLY_PROP_ONLINE:
299 val->intval = mbc->adapter_online;
308 static int usb_get_property(struct power_supply *psy,
309 enum power_supply_property psp,
310 union power_supply_propval *val)
312 struct pcf50633_mbc *mbc = container_of(psy, struct pcf50633_mbc, usb);
314 u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
315 PCF50633_MBCC7_USB_MASK;
318 case POWER_SUPPLY_PROP_ONLINE:
319 val->intval = mbc->usb_online &&
320 (usblim <= PCF50633_MBCC7_USB_500mA);
329 static int ac_get_property(struct power_supply *psy,
330 enum power_supply_property psp,
331 union power_supply_propval *val)
333 struct pcf50633_mbc *mbc = container_of(psy, struct pcf50633_mbc, ac);
335 u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
336 PCF50633_MBCC7_USB_MASK;
339 case POWER_SUPPLY_PROP_ONLINE:
340 val->intval = mbc->usb_online &&
341 (usblim == PCF50633_MBCC7_USB_1000mA);
350 static enum power_supply_property power_props[] = {
351 POWER_SUPPLY_PROP_ONLINE,
354 static const u8 mbc_irq_handlers[] = {
359 PCF50633_IRQ_BATFULL,
360 PCF50633_IRQ_CHGHALT,
361 PCF50633_IRQ_THLIMON,
362 PCF50633_IRQ_THLIMOFF,
363 PCF50633_IRQ_USBLIMON,
364 PCF50633_IRQ_USBLIMOFF,
369 static int __devinit pcf50633_mbc_probe(struct platform_device *pdev)
371 struct pcf50633_mbc *mbc;
376 mbc = kzalloc(sizeof(*mbc), GFP_KERNEL);
380 platform_set_drvdata(pdev, mbc);
381 mbc->pcf = dev_to_pcf50633(pdev->dev.parent);
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);
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;
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;
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;
413 ret = power_supply_register(&pdev->dev, &mbc->adapter);
415 dev_err(mbc->pcf->dev, "failed to register adapter\n");
420 ret = power_supply_register(&pdev->dev, &mbc->usb);
422 dev_err(mbc->pcf->dev, "failed to register usb\n");
423 power_supply_unregister(&mbc->adapter);
428 ret = power_supply_register(&pdev->dev, &mbc->ac);
430 dev_err(mbc->pcf->dev, "failed to register ac\n");
431 power_supply_unregister(&mbc->adapter);
432 power_supply_unregister(&mbc->usb);
437 ret = sysfs_create_group(&pdev->dev.kobj, &mbc_attr_group);
439 dev_err(mbc->pcf->dev, "failed to create sysfs entries\n");
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);
450 static int __devexit pcf50633_mbc_remove(struct platform_device *pdev)
452 struct pcf50633_mbc *mbc = platform_get_drvdata(pdev);
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]);
459 sysfs_remove_group(&pdev->dev.kobj, &mbc_attr_group);
460 power_supply_unregister(&mbc->usb);
461 power_supply_unregister(&mbc->adapter);
462 power_supply_unregister(&mbc->ac);
469 static struct platform_driver pcf50633_mbc_driver = {
471 .name = "pcf50633-mbc",
473 .probe = pcf50633_mbc_probe,
474 .remove = __devexit_p(pcf50633_mbc_remove),
477 module_platform_driver(pcf50633_mbc_driver);
479 MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
480 MODULE_DESCRIPTION("PCF50633 mbc driver");
481 MODULE_LICENSE("GPL");
482 MODULE_ALIAS("platform:pcf50633-mbc");