1 /*
2 * Driver for LP8727 Micro/Mini USB IC with intergrated charger
3 *
4 * Copyright (C) 2011 National Semiconductor
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 */
11
12 #include <linux/module.h>
13 #include <linux/slab.h>
14 #include <linux/interrupt.h>
15 #include <linux/i2c.h>
16 #include <linux/power_supply.h>
17 #include <linux/lp8727.h>
18
19 #define DEBOUNCE_MSEC 270
20
21 /* Registers */
22 #define CTRL1 0x1
23 #define CTRL2 0x2
24 #define SWCTRL 0x3
25 #define INT1 0x4
26 #define INT2 0x5
27 #define STATUS1 0x6
28 #define STATUS2 0x7
29 #define CHGCTRL2 0x9
30
31 /* CTRL1 register */
32 #define CP_EN (1 << 0)
33 #define ADC_EN (1 << 1)
34 #define ID200_EN (1 << 4)
35
36 /* CTRL2 register */
37 #define CHGDET_EN (1 << 1)
38 #define INT_EN (1 << 6)
39
40 /* SWCTRL register */
41 #define SW_DM1_DM (0x0 << 0)
42 #define SW_DM1_U1 (0x1 << 0)
43 #define SW_DM1_HiZ (0x7 << 0)
44 #define SW_DP2_DP (0x0 << 3)
45 #define SW_DP2_U2 (0x1 << 3)
46 #define SW_DP2_HiZ (0x7 << 3)
47
48 /* INT1 register */
49 #define IDNO (0xF << 0)
50 #define VBUS (1 << 4)
51
52 /* STATUS1 register */
53 #define CHGSTAT (3 << 4)
54 #define CHPORT (1 << 6)
55 #define DCPORT (1 << 7)
56
57 /* STATUS2 register */
58 #define TEMP_STAT (3 << 5)
59
60 enum lp8727_dev_id {
61 ID_NONE,
62 ID_TA,
63 ID_DEDICATED_CHG,
64 ID_USB_CHG,
65 ID_USB_DS,
66 ID_MAX,
67 };
68
69 enum lp8727_chg_stat {
70 PRECHG,
71 CC,
72 CV,
73 EOC,
74 };
75
76 struct lp8727_psy {
77 struct power_supply ac;
78 struct power_supply usb;
79 struct power_supply batt;
80 };
81
82 struct lp8727_chg {
83 struct device *dev;
84 struct i2c_client *client;
85 struct mutex xfer_lock;
86 struct delayed_work work;
87 struct workqueue_struct *irqthread;
88 struct lp8727_platform_data *pdata;
89 struct lp8727_psy *psy;
90 struct lp8727_chg_param *chg_parm;
91 enum lp8727_dev_id devid;
92 };
93
lp8727_i2c_read(struct lp8727_chg * pchg,u8 reg,u8 * data,u8 len)94 static int lp8727_i2c_read(struct lp8727_chg *pchg, u8 reg, u8 *data, u8 len)
95 {
96 s32 ret;
97
98 mutex_lock(&pchg->xfer_lock);
99 ret = i2c_smbus_read_i2c_block_data(pchg->client, reg, len, data);
100 mutex_unlock(&pchg->xfer_lock);
101
102 return (ret != len) ? -EIO : 0;
103 }
104
lp8727_i2c_write(struct lp8727_chg * pchg,u8 reg,u8 * data,u8 len)105 static int lp8727_i2c_write(struct lp8727_chg *pchg, u8 reg, u8 *data, u8 len)
106 {
107 s32 ret;
108
109 mutex_lock(&pchg->xfer_lock);
110 ret = i2c_smbus_write_i2c_block_data(pchg->client, reg, len, data);
111 mutex_unlock(&pchg->xfer_lock);
112
113 return ret;
114 }
115
lp8727_i2c_read_byte(struct lp8727_chg * pchg,u8 reg,u8 * data)116 static inline int lp8727_i2c_read_byte(struct lp8727_chg *pchg, u8 reg,
117 u8 *data)
118 {
119 return lp8727_i2c_read(pchg, reg, data, 1);
120 }
121
lp8727_i2c_write_byte(struct lp8727_chg * pchg,u8 reg,u8 * data)122 static inline int lp8727_i2c_write_byte(struct lp8727_chg *pchg, u8 reg,
123 u8 *data)
124 {
125 return lp8727_i2c_write(pchg, reg, data, 1);
126 }
127
lp8727_is_charger_attached(const char * name,int id)128 static int lp8727_is_charger_attached(const char *name, int id)
129 {
130 if (name) {
131 if (!strcmp(name, "ac"))
132 return (id == ID_TA || id == ID_DEDICATED_CHG) ? 1 : 0;
133 else if (!strcmp(name, "usb"))
134 return (id == ID_USB_CHG) ? 1 : 0;
135 }
136
137 return (id >= ID_TA && id <= ID_USB_CHG) ? 1 : 0;
138 }
139
lp8727_init_device(struct lp8727_chg * pchg)140 static void lp8727_init_device(struct lp8727_chg *pchg)
141 {
142 u8 val;
143
144 val = ID200_EN | ADC_EN | CP_EN;
145 if (lp8727_i2c_write_byte(pchg, CTRL1, &val))
146 dev_err(pchg->dev, "i2c write err : addr=0x%.2x\n", CTRL1);
147
148 val = INT_EN | CHGDET_EN;
149 if (lp8727_i2c_write_byte(pchg, CTRL2, &val))
150 dev_err(pchg->dev, "i2c write err : addr=0x%.2x\n", CTRL2);
151 }
152
lp8727_is_dedicated_charger(struct lp8727_chg * pchg)153 static int lp8727_is_dedicated_charger(struct lp8727_chg *pchg)
154 {
155 u8 val;
156 lp8727_i2c_read_byte(pchg, STATUS1, &val);
157 return (val & DCPORT);
158 }
159
lp8727_is_usb_charger(struct lp8727_chg * pchg)160 static int lp8727_is_usb_charger(struct lp8727_chg *pchg)
161 {
162 u8 val;
163 lp8727_i2c_read_byte(pchg, STATUS1, &val);
164 return (val & CHPORT);
165 }
166
lp8727_ctrl_switch(struct lp8727_chg * pchg,u8 sw)167 static void lp8727_ctrl_switch(struct lp8727_chg *pchg, u8 sw)
168 {
169 u8 val = sw;
170 lp8727_i2c_write_byte(pchg, SWCTRL, &val);
171 }
172
lp8727_id_detection(struct lp8727_chg * pchg,u8 id,int vbusin)173 static void lp8727_id_detection(struct lp8727_chg *pchg, u8 id, int vbusin)
174 {
175 u8 devid = ID_NONE;
176 u8 swctrl = SW_DM1_HiZ | SW_DP2_HiZ;
177
178 switch (id) {
179 case 0x5:
180 devid = ID_TA;
181 pchg->chg_parm = &pchg->pdata->ac;
182 break;
183 case 0xB:
184 if (lp8727_is_dedicated_charger(pchg)) {
185 pchg->chg_parm = &pchg->pdata->ac;
186 devid = ID_DEDICATED_CHG;
187 } else if (lp8727_is_usb_charger(pchg)) {
188 pchg->chg_parm = &pchg->pdata->usb;
189 devid = ID_USB_CHG;
190 swctrl = SW_DM1_DM | SW_DP2_DP;
191 } else if (vbusin) {
192 devid = ID_USB_DS;
193 swctrl = SW_DM1_DM | SW_DP2_DP;
194 }
195 break;
196 default:
197 devid = ID_NONE;
198 pchg->chg_parm = NULL;
199 break;
200 }
201
202 pchg->devid = devid;
203 lp8727_ctrl_switch(pchg, swctrl);
204 }
205
lp8727_enable_chgdet(struct lp8727_chg * pchg)206 static void lp8727_enable_chgdet(struct lp8727_chg *pchg)
207 {
208 u8 val;
209
210 lp8727_i2c_read_byte(pchg, CTRL2, &val);
211 val |= CHGDET_EN;
212 lp8727_i2c_write_byte(pchg, CTRL2, &val);
213 }
214
lp8727_delayed_func(struct work_struct * _work)215 static void lp8727_delayed_func(struct work_struct *_work)
216 {
217 u8 intstat[2], idno, vbus;
218 struct lp8727_chg *pchg =
219 container_of(_work, struct lp8727_chg, work.work);
220
221 if (lp8727_i2c_read(pchg, INT1, intstat, 2)) {
222 dev_err(pchg->dev, "can not read INT registers\n");
223 return;
224 }
225
226 idno = intstat[0] & IDNO;
227 vbus = intstat[0] & VBUS;
228
229 lp8727_id_detection(pchg, idno, vbus);
230 lp8727_enable_chgdet(pchg);
231
232 power_supply_changed(&pchg->psy->ac);
233 power_supply_changed(&pchg->psy->usb);
234 power_supply_changed(&pchg->psy->batt);
235 }
236
lp8727_isr_func(int irq,void * ptr)237 static irqreturn_t lp8727_isr_func(int irq, void *ptr)
238 {
239 struct lp8727_chg *pchg = ptr;
240 unsigned long delay = msecs_to_jiffies(DEBOUNCE_MSEC);
241
242 queue_delayed_work(pchg->irqthread, &pchg->work, delay);
243
244 return IRQ_HANDLED;
245 }
246
lp8727_intr_config(struct lp8727_chg * pchg)247 static void lp8727_intr_config(struct lp8727_chg *pchg)
248 {
249 INIT_DELAYED_WORK(&pchg->work, lp8727_delayed_func);
250
251 pchg->irqthread = create_singlethread_workqueue("lp8727-irqthd");
252 if (!pchg->irqthread)
253 dev_err(pchg->dev, "can not create thread for lp8727\n");
254
255 if (request_threaded_irq(pchg->client->irq,
256 NULL,
257 lp8727_isr_func,
258 IRQF_TRIGGER_FALLING, "lp8727_irq", pchg)) {
259 dev_err(pchg->dev, "lp8727 irq can not be registered\n");
260 }
261 }
262
263 static enum power_supply_property lp8727_charger_prop[] = {
264 POWER_SUPPLY_PROP_ONLINE,
265 };
266
267 static enum power_supply_property lp8727_battery_prop[] = {
268 POWER_SUPPLY_PROP_STATUS,
269 POWER_SUPPLY_PROP_HEALTH,
270 POWER_SUPPLY_PROP_PRESENT,
271 POWER_SUPPLY_PROP_VOLTAGE_NOW,
272 POWER_SUPPLY_PROP_CAPACITY,
273 POWER_SUPPLY_PROP_TEMP,
274 };
275
276 static char *battery_supplied_to[] = {
277 "main_batt",
278 };
279
lp8727_charger_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)280 static int lp8727_charger_get_property(struct power_supply *psy,
281 enum power_supply_property psp,
282 union power_supply_propval *val)
283 {
284 struct lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent);
285
286 if (psp == POWER_SUPPLY_PROP_ONLINE)
287 val->intval = lp8727_is_charger_attached(psy->name,
288 pchg->devid);
289
290 return 0;
291 }
292
lp8727_battery_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)293 static int lp8727_battery_get_property(struct power_supply *psy,
294 enum power_supply_property psp,
295 union power_supply_propval *val)
296 {
297 struct lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent);
298 u8 read;
299
300 switch (psp) {
301 case POWER_SUPPLY_PROP_STATUS:
302 if (lp8727_is_charger_attached(psy->name, pchg->devid)) {
303 lp8727_i2c_read_byte(pchg, STATUS1, &read);
304 if (((read & CHGSTAT) >> 4) == EOC)
305 val->intval = POWER_SUPPLY_STATUS_FULL;
306 else
307 val->intval = POWER_SUPPLY_STATUS_CHARGING;
308 } else {
309 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
310 }
311 break;
312 case POWER_SUPPLY_PROP_HEALTH:
313 lp8727_i2c_read_byte(pchg, STATUS2, &read);
314 read = (read & TEMP_STAT) >> 5;
315 if (read >= 0x1 && read <= 0x3)
316 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
317 else
318 val->intval = POWER_SUPPLY_HEALTH_GOOD;
319 break;
320 case POWER_SUPPLY_PROP_PRESENT:
321 if (pchg->pdata->get_batt_present)
322 val->intval = pchg->pdata->get_batt_present();
323 break;
324 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
325 if (pchg->pdata->get_batt_level)
326 val->intval = pchg->pdata->get_batt_level();
327 break;
328 case POWER_SUPPLY_PROP_CAPACITY:
329 if (pchg->pdata->get_batt_capacity)
330 val->intval = pchg->pdata->get_batt_capacity();
331 break;
332 case POWER_SUPPLY_PROP_TEMP:
333 if (pchg->pdata->get_batt_temp)
334 val->intval = pchg->pdata->get_batt_temp();
335 break;
336 default:
337 break;
338 }
339
340 return 0;
341 }
342
lp8727_charger_changed(struct power_supply * psy)343 static void lp8727_charger_changed(struct power_supply *psy)
344 {
345 struct lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent);
346 u8 val;
347 u8 eoc_level, ichg;
348
349 if (lp8727_is_charger_attached(psy->name, pchg->devid)) {
350 if (pchg->chg_parm) {
351 eoc_level = pchg->chg_parm->eoc_level;
352 ichg = pchg->chg_parm->ichg;
353 val = (ichg << 4) | eoc_level;
354 lp8727_i2c_write_byte(pchg, CHGCTRL2, &val);
355 }
356 }
357 }
358
lp8727_register_psy(struct lp8727_chg * pchg)359 static int lp8727_register_psy(struct lp8727_chg *pchg)
360 {
361 struct lp8727_psy *psy;
362
363 psy = kzalloc(sizeof(*psy), GFP_KERNEL);
364 if (!psy)
365 goto err_mem;
366
367 pchg->psy = psy;
368
369 psy->ac.name = "ac";
370 psy->ac.type = POWER_SUPPLY_TYPE_MAINS;
371 psy->ac.properties = lp8727_charger_prop;
372 psy->ac.num_properties = ARRAY_SIZE(lp8727_charger_prop);
373 psy->ac.get_property = lp8727_charger_get_property;
374 psy->ac.supplied_to = battery_supplied_to;
375 psy->ac.num_supplicants = ARRAY_SIZE(battery_supplied_to);
376
377 if (power_supply_register(pchg->dev, &psy->ac))
378 goto err_psy;
379
380 psy->usb.name = "usb";
381 psy->usb.type = POWER_SUPPLY_TYPE_USB;
382 psy->usb.properties = lp8727_charger_prop;
383 psy->usb.num_properties = ARRAY_SIZE(lp8727_charger_prop);
384 psy->usb.get_property = lp8727_charger_get_property;
385 psy->usb.supplied_to = battery_supplied_to;
386 psy->usb.num_supplicants = ARRAY_SIZE(battery_supplied_to);
387
388 if (power_supply_register(pchg->dev, &psy->usb))
389 goto err_psy;
390
391 psy->batt.name = "main_batt";
392 psy->batt.type = POWER_SUPPLY_TYPE_BATTERY;
393 psy->batt.properties = lp8727_battery_prop;
394 psy->batt.num_properties = ARRAY_SIZE(lp8727_battery_prop);
395 psy->batt.get_property = lp8727_battery_get_property;
396 psy->batt.external_power_changed = lp8727_charger_changed;
397
398 if (power_supply_register(pchg->dev, &psy->batt))
399 goto err_psy;
400
401 return 0;
402
403 err_mem:
404 return -ENOMEM;
405 err_psy:
406 kfree(psy);
407 return -EPERM;
408 }
409
lp8727_unregister_psy(struct lp8727_chg * pchg)410 static void lp8727_unregister_psy(struct lp8727_chg *pchg)
411 {
412 struct lp8727_psy *psy = pchg->psy;
413
414 if (!psy)
415 return;
416
417 power_supply_unregister(&psy->ac);
418 power_supply_unregister(&psy->usb);
419 power_supply_unregister(&psy->batt);
420 kfree(psy);
421 }
422
lp8727_probe(struct i2c_client * cl,const struct i2c_device_id * id)423 static int lp8727_probe(struct i2c_client *cl, const struct i2c_device_id *id)
424 {
425 struct lp8727_chg *pchg;
426 int ret;
427
428 if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
429 return -EIO;
430
431 pchg = kzalloc(sizeof(*pchg), GFP_KERNEL);
432 if (!pchg)
433 return -ENOMEM;
434
435 pchg->client = cl;
436 pchg->dev = &cl->dev;
437 pchg->pdata = cl->dev.platform_data;
438 i2c_set_clientdata(cl, pchg);
439
440 mutex_init(&pchg->xfer_lock);
441
442 lp8727_init_device(pchg);
443 lp8727_intr_config(pchg);
444
445 ret = lp8727_register_psy(pchg);
446 if (ret)
447 dev_err(pchg->dev,
448 "can not register power supplies. err=%d", ret);
449
450 return 0;
451 }
452
lp8727_remove(struct i2c_client * cl)453 static int __devexit lp8727_remove(struct i2c_client *cl)
454 {
455 struct lp8727_chg *pchg = i2c_get_clientdata(cl);
456
457 lp8727_unregister_psy(pchg);
458 free_irq(pchg->client->irq, pchg);
459 flush_workqueue(pchg->irqthread);
460 destroy_workqueue(pchg->irqthread);
461 kfree(pchg);
462 return 0;
463 }
464
465 static const struct i2c_device_id lp8727_ids[] = {
466 {"lp8727", 0},
467 { }
468 };
469
470 static struct i2c_driver lp8727_driver = {
471 .driver = {
472 .name = "lp8727",
473 },
474 .probe = lp8727_probe,
475 .remove = __devexit_p(lp8727_remove),
476 .id_table = lp8727_ids,
477 };
478
lp8727_init(void)479 static int __init lp8727_init(void)
480 {
481 return i2c_add_driver(&lp8727_driver);
482 }
483
lp8727_exit(void)484 static void __exit lp8727_exit(void)
485 {
486 i2c_del_driver(&lp8727_driver);
487 }
488
489 module_init(lp8727_init);
490 module_exit(lp8727_exit);
491
492 MODULE_DESCRIPTION("National Semiconductor LP8727 charger driver");
493 MODULE_AUTHOR
494 ("Woogyom Kim <milo.kim@ti.com>, Daniel Jeong <daniel.jeong@ti.com>");
495 MODULE_LICENSE("GPL");
496