Root/drivers/power/pcf50633-charger.c

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/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>
26
27#include <linux/mfd/pcf50633/core.h>
28#include <linux/mfd/pcf50633/mbc.h>
29
30struct pcf50633_mbc {
31    struct pcf50633 *pcf;
32
33    int adapter_online;
34    int usb_online;
35
36    struct power_supply usb;
37    struct power_supply adapter;
38    struct power_supply ac;
39};
40
41int 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;
46    int charging_start = 1;
47    u8 mbcs2, chgmod;
48    unsigned int mbcc5;
49
50    if (ma >= 1000) {
51        bits = PCF50633_MBCC7_USB_1000mA;
52        ma = 1000;
53    } else if (ma >= 500) {
54        bits = PCF50633_MBCC7_USB_500mA;
55        ma = 500;
56    } else if (ma >= 100) {
57        bits = PCF50633_MBCC7_USB_100mA;
58        ma = 100;
59    } else {
60        bits = PCF50633_MBCC7_USB_SUSPEND;
61        charging_start = 0;
62        ma = 0;
63    }
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
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
90    mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2);
91    chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK);
92
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.
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);
100    else {
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);
105    }
106
107    power_supply_changed(&mbc->usb);
108
109    return ret;
110}
111EXPORT_SYMBOL_GPL(pcf50633_mbc_usb_curlim_set);
112
113int pcf50633_mbc_get_status(struct pcf50633 *pcf)
114{
115    struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev);
116    int status = 0;
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;
124
125    if (mbc->usb_online)
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;
139
140    return status;
141}
142EXPORT_SYMBOL_GPL(pcf50633_mbc_get_status);
143
144int 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}
153EXPORT_SYMBOL_GPL(pcf50633_mbc_get_usb_online_status);
154
155static ssize_t
156show_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}
165static DEVICE_ATTR(chgmode, S_IRUGO, show_chgmode, NULL);
166
167static ssize_t
168show_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
187static 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
203static DEVICE_ATTR(usb_curlim, S_IRUGO | S_IWUSR, show_usblim, set_usblim);
204
205static ssize_t
206show_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
220static 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 */
248static DEVICE_ATTR(chg_curlim, S_IRUGO | S_IWUSR, show_chglim, set_chglim);
249
250static struct attribute *pcf50633_mbc_sysfs_entries[] = {
251    &dev_attr_chgmode.attr,
252    &dev_attr_usb_curlim.attr,
253    &dev_attr_chg_curlim.attr,
254    NULL,
255};
256
257static struct attribute_group mbc_attr_group = {
258    .name = NULL, /* put in device directory */
259    .attrs = pcf50633_mbc_sysfs_entries,
260};
261
262static void
263pcf50633_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;
272        pcf50633_mbc_usb_curlim_set(mbc->pcf, 0);
273    }
274
275    /* Adapter */
276    if (irq == PCF50633_IRQ_ADPINS)
277        mbc->adapter_online = 1;
278    else if (irq == PCF50633_IRQ_ADPREM)
279        mbc->adapter_online = 0;
280
281    power_supply_changed(&mbc->ac);
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
289static int adapter_get_property(struct power_supply *psy,
290            enum power_supply_property psp,
291            union power_supply_propval *val)
292{
293    struct pcf50633_mbc *mbc = container_of(psy,
294                struct pcf50633_mbc, adapter);
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
308static 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;
314    u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
315                        PCF50633_MBCC7_USB_MASK;
316
317    switch (psp) {
318    case POWER_SUPPLY_PROP_ONLINE:
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
329static 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;
337
338    switch (psp) {
339    case POWER_SUPPLY_PROP_ONLINE:
340        val->intval = mbc->usb_online &&
341                (usblim == PCF50633_MBCC7_USB_1000mA);
342        break;
343    default:
344        ret = -EINVAL;
345        break;
346    }
347    return ret;
348}
349
350static enum power_supply_property power_props[] = {
351    POWER_SUPPLY_PROP_ONLINE,
352};
353
354static 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
369static int __devinit pcf50633_mbc_probe(struct platform_device *pdev)
370{
371    struct pcf50633_mbc *mbc;
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);
381    mbc->pcf = dev_to_pcf50633(pdev->dev.parent);
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
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
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
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    }
436
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
450static 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
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);
463
464    kfree(mbc);
465
466    return 0;
467}
468
469static 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
477module_platform_driver(pcf50633_mbc_driver);
478
479MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
480MODULE_DESCRIPTION("PCF50633 mbc driver");
481MODULE_LICENSE("GPL");
482MODULE_ALIAS("platform:pcf50633-mbc");
483

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