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;
39 };
40
pcf50633_mbc_usb_curlim_set(struct pcf50633 * pcf,int ma)41 int 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
47 if (ma >= 1000)
48 bits = PCF50633_MBCC7_USB_1000mA;
49 else if (ma >= 500)
50 bits = PCF50633_MBCC7_USB_500mA;
51 else if (ma >= 100)
52 bits = PCF50633_MBCC7_USB_100mA;
53 else
54 bits = PCF50633_MBCC7_USB_SUSPEND;
55
56 ret = pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC7,
57 PCF50633_MBCC7_USB_MASK, bits);
58 if (ret)
59 dev_err(pcf->dev, "error setting usb curlim to %d mA\n", ma);
60 else
61 dev_info(pcf->dev, "usb curlim to %d mA\n", ma);
62
63 power_supply_changed(&mbc->usb);
64
65 return ret;
66 }
67 EXPORT_SYMBOL_GPL(pcf50633_mbc_usb_curlim_set);
68
pcf50633_mbc_get_status(struct pcf50633 * pcf)69 int pcf50633_mbc_get_status(struct pcf50633 *pcf)
70 {
71 struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev);
72 int status = 0;
73
74 if (mbc->usb_online)
75 status |= PCF50633_MBC_USB_ONLINE;
76 if (mbc->usb_active)
77 status |= PCF50633_MBC_USB_ACTIVE;
78 if (mbc->adapter_online)
79 status |= PCF50633_MBC_ADAPTER_ONLINE;
80 if (mbc->adapter_active)
81 status |= PCF50633_MBC_ADAPTER_ACTIVE;
82
83 return status;
84 }
85 EXPORT_SYMBOL_GPL(pcf50633_mbc_get_status);
86
pcf50633_mbc_set_status(struct pcf50633 * pcf,int what,int status)87 void pcf50633_mbc_set_status(struct pcf50633 *pcf, int what, int status)
88 {
89 struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev);
90
91 if (what & PCF50633_MBC_USB_ONLINE)
92 mbc->usb_online = !!status;
93 if (what & PCF50633_MBC_USB_ACTIVE)
94 mbc->usb_active = !!status;
95 if (what & PCF50633_MBC_ADAPTER_ONLINE)
96 mbc->adapter_online = !!status;
97 if (what & PCF50633_MBC_ADAPTER_ACTIVE)
98 mbc->adapter_active = !!status;
99 }
100 EXPORT_SYMBOL_GPL(pcf50633_mbc_set_status);
101
102 static ssize_t
show_chgmode(struct device * dev,struct device_attribute * attr,char * buf)103 show_chgmode(struct device *dev, struct device_attribute *attr, char *buf)
104 {
105 struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
106
107 u8 mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2);
108 u8 chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK);
109
110 return sprintf(buf, "%d\n", chgmod);
111 }
112 static DEVICE_ATTR(chgmode, S_IRUGO, show_chgmode, NULL);
113
114 static ssize_t
show_usblim(struct device * dev,struct device_attribute * attr,char * buf)115 show_usblim(struct device *dev, struct device_attribute *attr, char *buf)
116 {
117 struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
118 u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
119 PCF50633_MBCC7_USB_MASK;
120 unsigned int ma;
121
122 if (usblim == PCF50633_MBCC7_USB_1000mA)
123 ma = 1000;
124 else if (usblim == PCF50633_MBCC7_USB_500mA)
125 ma = 500;
126 else if (usblim == PCF50633_MBCC7_USB_100mA)
127 ma = 100;
128 else
129 ma = 0;
130
131 return sprintf(buf, "%u\n", ma);
132 }
133
set_usblim(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)134 static ssize_t set_usblim(struct device *dev,
135 struct device_attribute *attr, const char *buf, size_t count)
136 {
137 struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
138 unsigned long ma;
139 int ret;
140
141 ret = strict_strtoul(buf, 10, &ma);
142 if (ret)
143 return -EINVAL;
144
145 pcf50633_mbc_usb_curlim_set(mbc->pcf, ma);
146
147 return count;
148 }
149
150 static DEVICE_ATTR(usb_curlim, S_IRUGO | S_IWUSR, show_usblim, set_usblim);
151
152 static struct attribute *pcf50633_mbc_sysfs_entries[] = {
153 &dev_attr_chgmode.attr,
154 &dev_attr_usb_curlim.attr,
155 NULL,
156 };
157
158 static struct attribute_group mbc_attr_group = {
159 .name = NULL, /* put in device directory */
160 .attrs = pcf50633_mbc_sysfs_entries,
161 };
162
163 static void
pcf50633_mbc_irq_handler(int irq,void * data)164 pcf50633_mbc_irq_handler(int irq, void *data)
165 {
166 struct pcf50633_mbc *mbc = data;
167
168 /* USB */
169 if (irq == PCF50633_IRQ_USBINS) {
170 mbc->usb_online = 1;
171 } else if (irq == PCF50633_IRQ_USBREM) {
172 mbc->usb_online = 0;
173 mbc->usb_active = 0;
174 pcf50633_mbc_usb_curlim_set(mbc->pcf, 0);
175 }
176
177 /* Adapter */
178 if (irq == PCF50633_IRQ_ADPINS) {
179 mbc->adapter_online = 1;
180 mbc->adapter_active = 1;
181 } else if (irq == PCF50633_IRQ_ADPREM) {
182 mbc->adapter_online = 0;
183 mbc->adapter_active = 0;
184 }
185
186 if (irq == PCF50633_IRQ_BATFULL) {
187 mbc->usb_active = 0;
188 mbc->adapter_active = 0;
189 }
190
191 power_supply_changed(&mbc->usb);
192 power_supply_changed(&mbc->adapter);
193
194 if (mbc->pcf->pdata->mbc_event_callback)
195 mbc->pcf->pdata->mbc_event_callback(mbc->pcf, irq);
196 }
197
adapter_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)198 static int adapter_get_property(struct power_supply *psy,
199 enum power_supply_property psp,
200 union power_supply_propval *val)
201 {
202 struct pcf50633_mbc *mbc = container_of(psy,
203 struct pcf50633_mbc, adapter);
204 int ret = 0;
205
206 switch (psp) {
207 case POWER_SUPPLY_PROP_ONLINE:
208 val->intval = mbc->adapter_online;
209 break;
210 default:
211 ret = -EINVAL;
212 break;
213 }
214 return ret;
215 }
216
usb_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)217 static int usb_get_property(struct power_supply *psy,
218 enum power_supply_property psp,
219 union power_supply_propval *val)
220 {
221 struct pcf50633_mbc *mbc = container_of(psy, struct pcf50633_mbc, usb);
222 int ret = 0;
223
224 switch (psp) {
225 case POWER_SUPPLY_PROP_ONLINE:
226 val->intval = mbc->usb_online;
227 break;
228 default:
229 ret = -EINVAL;
230 break;
231 }
232 return ret;
233 }
234
235 static enum power_supply_property power_props[] = {
236 POWER_SUPPLY_PROP_ONLINE,
237 };
238
239 static const u8 mbc_irq_handlers[] = {
240 PCF50633_IRQ_ADPINS,
241 PCF50633_IRQ_ADPREM,
242 PCF50633_IRQ_USBINS,
243 PCF50633_IRQ_USBREM,
244 PCF50633_IRQ_BATFULL,
245 PCF50633_IRQ_CHGHALT,
246 PCF50633_IRQ_THLIMON,
247 PCF50633_IRQ_THLIMOFF,
248 PCF50633_IRQ_USBLIMON,
249 PCF50633_IRQ_USBLIMOFF,
250 PCF50633_IRQ_LOWSYS,
251 PCF50633_IRQ_LOWBAT,
252 };
253
pcf50633_mbc_probe(struct platform_device * pdev)254 static int __devinit pcf50633_mbc_probe(struct platform_device *pdev)
255 {
256 struct pcf50633_mbc *mbc;
257 struct pcf50633_subdev_pdata *pdata = pdev->dev.platform_data;
258 int ret;
259 int i;
260 u8 mbcs1;
261
262 mbc = kzalloc(sizeof(*mbc), GFP_KERNEL);
263 if (!mbc)
264 return -ENOMEM;
265
266 platform_set_drvdata(pdev, mbc);
267 mbc->pcf = pdata->pcf;
268
269 /* Set up IRQ handlers */
270 for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++)
271 pcf50633_register_irq(mbc->pcf, mbc_irq_handlers[i],
272 pcf50633_mbc_irq_handler, mbc);
273
274 /* Create power supplies */
275 mbc->adapter.name = "adapter";
276 mbc->adapter.type = POWER_SUPPLY_TYPE_MAINS;
277 mbc->adapter.properties = power_props;
278 mbc->adapter.num_properties = ARRAY_SIZE(power_props);
279 mbc->adapter.get_property = &adapter_get_property;
280 mbc->adapter.supplied_to = mbc->pcf->pdata->batteries;
281 mbc->adapter.num_supplicants = mbc->pcf->pdata->num_batteries;
282
283 mbc->usb.name = "usb";
284 mbc->usb.type = POWER_SUPPLY_TYPE_USB;
285 mbc->usb.properties = power_props;
286 mbc->usb.num_properties = ARRAY_SIZE(power_props);
287 mbc->usb.get_property = usb_get_property;
288 mbc->usb.supplied_to = mbc->pcf->pdata->batteries;
289 mbc->usb.num_supplicants = mbc->pcf->pdata->num_batteries;
290
291 ret = power_supply_register(&pdev->dev, &mbc->adapter);
292 if (ret) {
293 dev_err(mbc->pcf->dev, "failed to register adapter\n");
294 kfree(mbc);
295 return ret;
296 }
297
298 ret = power_supply_register(&pdev->dev, &mbc->usb);
299 if (ret) {
300 dev_err(mbc->pcf->dev, "failed to register usb\n");
301 power_supply_unregister(&mbc->adapter);
302 kfree(mbc);
303 return ret;
304 }
305
306 ret = sysfs_create_group(&pdev->dev.kobj, &mbc_attr_group);
307 if (ret)
308 dev_err(mbc->pcf->dev, "failed to create sysfs entries\n");
309
310 mbcs1 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS1);
311 if (mbcs1 & PCF50633_MBCS1_USBPRES)
312 pcf50633_mbc_irq_handler(PCF50633_IRQ_USBINS, mbc);
313 if (mbcs1 & PCF50633_MBCS1_ADAPTPRES)
314 pcf50633_mbc_irq_handler(PCF50633_IRQ_ADPINS, mbc);
315
316 return 0;
317 }
318
pcf50633_mbc_remove(struct platform_device * pdev)319 static int __devexit pcf50633_mbc_remove(struct platform_device *pdev)
320 {
321 struct pcf50633_mbc *mbc = platform_get_drvdata(pdev);
322 int i;
323
324 /* Remove IRQ handlers */
325 for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++)
326 pcf50633_free_irq(mbc->pcf, mbc_irq_handlers[i]);
327
328 power_supply_unregister(&mbc->usb);
329 power_supply_unregister(&mbc->adapter);
330
331 kfree(mbc);
332
333 return 0;
334 }
335
336 static struct platform_driver pcf50633_mbc_driver = {
337 .driver = {
338 .name = "pcf50633-mbc",
339 },
340 .probe = pcf50633_mbc_probe,
341 .remove = __devexit_p(pcf50633_mbc_remove),
342 };
343
pcf50633_mbc_init(void)344 static int __init pcf50633_mbc_init(void)
345 {
346 return platform_driver_register(&pcf50633_mbc_driver);
347 }
348 module_init(pcf50633_mbc_init);
349
pcf50633_mbc_exit(void)350 static void __exit pcf50633_mbc_exit(void)
351 {
352 platform_driver_unregister(&pcf50633_mbc_driver);
353 }
354 module_exit(pcf50633_mbc_exit);
355
356 MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
357 MODULE_DESCRIPTION("PCF50633 mbc driver");
358 MODULE_LICENSE("GPL");
359 MODULE_ALIAS("platform:pcf50633-mbc");
360