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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
29struct 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;
39
40 struct delayed_work charging_restart_work;
41};
42
43int 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;
48 int charging_start = 1;
49 u8 mbcs2, chgmod;
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;
57 else {
58 bits = PCF50633_MBCC7_USB_SUSPEND;
59 charging_start = 0;
60 }
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
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
85 power_supply_changed(&mbc->usb);
86
87 return ret;
88}
89EXPORT_SYMBOL_GPL(pcf50633_mbc_usb_curlim_set);
90
91int 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}
107EXPORT_SYMBOL_GPL(pcf50633_mbc_get_status);
108
109static ssize_t
110show_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}
119static DEVICE_ATTR(chgmode, S_IRUGO, show_chgmode, NULL);
120
121static ssize_t
122show_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
141static 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
157static DEVICE_ATTR(usb_curlim, S_IRUGO | S_IWUSR, show_usblim, set_usblim);
158
159static struct attribute *pcf50633_mbc_sysfs_entries[] = {
160 &dev_attr_chgmode.attr,
161 &dev_attr_usb_curlim.attr,
162 NULL,
163};
164
165static struct attribute_group mbc_attr_group = {
166 .name = NULL, /* put in device directory */
167 .attrs = pcf50633_mbc_sysfs_entries,
168};
169
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
179static 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
202static void
203pcf50633_mbc_irq_handler(int irq, void *data)
204{
205 struct pcf50633_mbc *mbc = data;
206 int chg_restart_interval =
207 mbc->pcf->pdata->charging_restart_interval;
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);
216 cancel_delayed_work_sync(&mbc->charging_restart_work);
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;
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;
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
247static int adapter_get_property(struct power_supply *psy,
248 enum power_supply_property psp,
249 union power_supply_propval *val)
250{
251 struct pcf50633_mbc *mbc = container_of(psy,
252 struct pcf50633_mbc, adapter);
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
266static 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
284static enum power_supply_property power_props[] = {
285 POWER_SUPPLY_PROP_ONLINE,
286};
287
288static 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
303static 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
355 INIT_DELAYED_WORK(&mbc->charging_restart_work,
356 pcf50633_mbc_charging_restart);
357
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
371static 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
383 cancel_delayed_work_sync(&mbc->charging_restart_work);
384
385 kfree(mbc);
386
387 return 0;
388}
389
390static 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
398static int __init pcf50633_mbc_init(void)
399{
400 return platform_driver_register(&pcf50633_mbc_driver);
401}
402module_init(pcf50633_mbc_init);
403
404static void __exit pcf50633_mbc_exit(void)
405{
406 platform_driver_unregister(&pcf50633_mbc_driver);
407}
408module_exit(pcf50633_mbc_exit);
409
410MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
411MODULE_DESCRIPTION("PCF50633 mbc driver");
412MODULE_LICENSE("GPL");
413MODULE_ALIAS("platform:pcf50633-mbc");