lp8727_charger.c revision e39b828f5355e41a8fd24f413fb9dfb81d808397 
1/*
2 * Driver for LP8727 Micro/Mini USB IC with intergrated charger
3 *
4 *			Copyright (C) 2011 Texas Instruments
5 *			Copyright (C) 2011 National Semiconductor
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 */
12
13#include <linux/module.h>
14#include <linux/slab.h>
15#include <linux/interrupt.h>
16#include <linux/i2c.h>
17#include <linux/power_supply.h>
18#include <linux/lp8727.h>
19
20#define DEBOUNCE_MSEC	270
21
22/* Registers */
23#define CTRL1		0x1
24#define CTRL2		0x2
25#define	SWCTRL		0x3
26#define INT1		0x4
27#define INT2		0x5
28#define STATUS1		0x6
29#define STATUS2 	0x7
30#define CHGCTRL2	0x9
31
32/* CTRL1 register */
33#define CP_EN		(1 << 0)
34#define ADC_EN		(1 << 1)
35#define ID200_EN	(1 << 4)
36
37/* CTRL2 register */
38#define CHGDET_EN	(1 << 1)
39#define INT_EN		(1 << 6)
40
41/* SWCTRL register */
42#define SW_DM1_DM	(0x0 << 0)
43#define SW_DM1_U1	(0x1 << 0)
44#define SW_DM1_HiZ	(0x7 << 0)
45#define SW_DP2_DP	(0x0 << 3)
46#define SW_DP2_U2	(0x1 << 3)
47#define SW_DP2_HiZ	(0x7 << 3)
48
49/* INT1 register */
50#define IDNO		(0xF << 0)
51#define VBUS		(1 << 4)
52
53/* STATUS1 register */
54#define CHGSTAT		(3 << 4)
55#define CHPORT		(1 << 6)
56#define DCPORT		(1 << 7)
57
58/* STATUS2 register */
59#define TEMP_STAT	(3 << 5)
60
61enum lp8727_dev_id {
62	ID_NONE,
63	ID_TA,
64	ID_DEDICATED_CHG,
65	ID_USB_CHG,
66	ID_USB_DS,
67	ID_MAX,
68};
69
70enum lp8727_chg_stat {
71	PRECHG,
72	CC,
73	CV,
74	EOC,
75};
76
77struct lp8727_psy {
78	struct power_supply ac;
79	struct power_supply usb;
80	struct power_supply batt;
81};
82
83struct lp8727_chg {
84	struct device *dev;
85	struct i2c_client *client;
86	struct mutex xfer_lock;
87	struct delayed_work work;
88	struct workqueue_struct *irqthread;
89	struct lp8727_platform_data *pdata;
90	struct lp8727_psy *psy;
91	struct lp8727_chg_param *chg_parm;
92	enum lp8727_dev_id devid;
93};
94
95static int lp8727_i2c_read(struct lp8727_chg *pchg, u8 reg, u8 *data, u8 len)
96{
97	s32 ret;
98
99	mutex_lock(&pchg->xfer_lock);
100	ret = i2c_smbus_read_i2c_block_data(pchg->client, reg, len, data);
101	mutex_unlock(&pchg->xfer_lock);
102
103	return (ret != len) ? -EIO : 0;
104}
105
106static int lp8727_i2c_write(struct lp8727_chg *pchg, u8 reg, u8 *data, u8 len)
107{
108	s32 ret;
109
110	mutex_lock(&pchg->xfer_lock);
111	ret = i2c_smbus_write_i2c_block_data(pchg->client, reg, len, data);
112	mutex_unlock(&pchg->xfer_lock);
113
114	return ret;
115}
116
117static inline int lp8727_i2c_read_byte(struct lp8727_chg *pchg, u8 reg,
118				       u8 *data)
119{
120	return lp8727_i2c_read(pchg, reg, data, 1);
121}
122
123static inline int lp8727_i2c_write_byte(struct lp8727_chg *pchg, u8 reg,
124					u8 *data)
125{
126	return lp8727_i2c_write(pchg, reg, data, 1);
127}
128
129static int lp8727_is_charger_attached(const char *name, int id)
130{
131	if (name) {
132		if (!strcmp(name, "ac"))
133			return (id == ID_TA || id == ID_DEDICATED_CHG) ? 1 : 0;
134		else if (!strcmp(name, "usb"))
135			return (id == ID_USB_CHG) ? 1 : 0;
136	}
137
138	return (id >= ID_TA && id <= ID_USB_CHG) ? 1 : 0;
139}
140
141static void lp8727_init_device(struct lp8727_chg *pchg)
142{
143	u8 val;
144
145	val = ID200_EN | ADC_EN | CP_EN;
146	if (lp8727_i2c_write_byte(pchg, CTRL1, &val))
147		dev_err(pchg->dev, "i2c write err : addr=0x%.2x\n", CTRL1);
148
149	val = INT_EN | CHGDET_EN;
150	if (lp8727_i2c_write_byte(pchg, CTRL2, &val))
151		dev_err(pchg->dev, "i2c write err : addr=0x%.2x\n", CTRL2);
152}
153
154static int lp8727_is_dedicated_charger(struct lp8727_chg *pchg)
155{
156	u8 val;
157	lp8727_i2c_read_byte(pchg, STATUS1, &val);
158	return (val & DCPORT);
159}
160
161static int lp8727_is_usb_charger(struct lp8727_chg *pchg)
162{
163	u8 val;
164	lp8727_i2c_read_byte(pchg, STATUS1, &val);
165	return (val & CHPORT);
166}
167
168static void lp8727_ctrl_switch(struct lp8727_chg *pchg, u8 sw)
169{
170	u8 val = sw;
171	lp8727_i2c_write_byte(pchg, SWCTRL, &val);
172}
173
174static void lp8727_id_detection(struct lp8727_chg *pchg, u8 id, int vbusin)
175{
176	u8 devid = ID_NONE;
177	u8 swctrl = SW_DM1_HiZ | SW_DP2_HiZ;
178
179	switch (id) {
180	case 0x5:
181		devid = ID_TA;
182		pchg->chg_parm = &pchg->pdata->ac;
183		break;
184	case 0xB:
185		if (lp8727_is_dedicated_charger(pchg)) {
186			pchg->chg_parm = &pchg->pdata->ac;
187			devid = ID_DEDICATED_CHG;
188		} else if (lp8727_is_usb_charger(pchg)) {
189			pchg->chg_parm = &pchg->pdata->usb;
190			devid = ID_USB_CHG;
191			swctrl = SW_DM1_DM | SW_DP2_DP;
192		} else if (vbusin) {
193			devid = ID_USB_DS;
194			swctrl = SW_DM1_DM | SW_DP2_DP;
195		}
196		break;
197	default:
198		devid = ID_NONE;
199		pchg->chg_parm = NULL;
200		break;
201	}
202
203	pchg->devid = devid;
204	lp8727_ctrl_switch(pchg, swctrl);
205}
206
207static void lp8727_enable_chgdet(struct lp8727_chg *pchg)
208{
209	u8 val;
210
211	lp8727_i2c_read_byte(pchg, CTRL2, &val);
212	val |= CHGDET_EN;
213	lp8727_i2c_write_byte(pchg, CTRL2, &val);
214}
215
216static void lp8727_delayed_func(struct work_struct *_work)
217{
218	u8 intstat[2], idno, vbus;
219	struct lp8727_chg *pchg =
220	    container_of(_work, struct lp8727_chg, work.work);
221
222	if (lp8727_i2c_read(pchg, INT1, intstat, 2)) {
223		dev_err(pchg->dev, "can not read INT registers\n");
224		return;
225	}
226
227	idno = intstat[0] & IDNO;
228	vbus = intstat[0] & VBUS;
229
230	lp8727_id_detection(pchg, idno, vbus);
231	lp8727_enable_chgdet(pchg);
232
233	power_supply_changed(&pchg->psy->ac);
234	power_supply_changed(&pchg->psy->usb);
235	power_supply_changed(&pchg->psy->batt);
236}
237
238static irqreturn_t lp8727_isr_func(int irq, void *ptr)
239{
240	struct lp8727_chg *pchg = ptr;
241	unsigned long delay = msecs_to_jiffies(DEBOUNCE_MSEC);
242
243	queue_delayed_work(pchg->irqthread, &pchg->work, delay);
244
245	return IRQ_HANDLED;
246}
247
248static void lp8727_intr_config(struct lp8727_chg *pchg)
249{
250	INIT_DELAYED_WORK(&pchg->work, lp8727_delayed_func);
251
252	pchg->irqthread = create_singlethread_workqueue("lp8727-irqthd");
253	if (!pchg->irqthread)
254		dev_err(pchg->dev, "can not create thread for lp8727\n");
255
256	if (request_threaded_irq(pchg->client->irq,
257				 NULL,
258				 lp8727_isr_func,
259				 IRQF_TRIGGER_FALLING, "lp8727_irq", pchg)) {
260		dev_err(pchg->dev, "lp8727 irq can not be registered\n");
261	}
262}
263
264static enum power_supply_property lp8727_charger_prop[] = {
265	POWER_SUPPLY_PROP_ONLINE,
266};
267
268static enum power_supply_property lp8727_battery_prop[] = {
269	POWER_SUPPLY_PROP_STATUS,
270	POWER_SUPPLY_PROP_HEALTH,
271	POWER_SUPPLY_PROP_PRESENT,
272	POWER_SUPPLY_PROP_VOLTAGE_NOW,
273	POWER_SUPPLY_PROP_CAPACITY,
274	POWER_SUPPLY_PROP_TEMP,
275};
276
277static char *battery_supplied_to[] = {
278	"main_batt",
279};
280
281static int lp8727_charger_get_property(struct power_supply *psy,
282				       enum power_supply_property psp,
283				       union power_supply_propval *val)
284{
285	struct lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent);
286
287	if (psp == POWER_SUPPLY_PROP_ONLINE)
288		val->intval = lp8727_is_charger_attached(psy->name,
289							 pchg->devid);
290
291	return 0;
292}
293
294static int lp8727_battery_get_property(struct power_supply *psy,
295				       enum power_supply_property psp,
296				       union power_supply_propval *val)
297{
298	struct lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent);
299	u8 read;
300
301	switch (psp) {
302	case POWER_SUPPLY_PROP_STATUS:
303		if (lp8727_is_charger_attached(psy->name, pchg->devid)) {
304			lp8727_i2c_read_byte(pchg, STATUS1, &read);
305			if (((read & CHGSTAT) >> 4) == EOC)
306				val->intval = POWER_SUPPLY_STATUS_FULL;
307			else
308				val->intval = POWER_SUPPLY_STATUS_CHARGING;
309		} else {
310			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
311		}
312		break;
313	case POWER_SUPPLY_PROP_HEALTH:
314		lp8727_i2c_read_byte(pchg, STATUS2, &read);
315		read = (read & TEMP_STAT) >> 5;
316		if (read >= 0x1 && read <= 0x3)
317			val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
318		else
319			val->intval = POWER_SUPPLY_HEALTH_GOOD;
320		break;
321	case POWER_SUPPLY_PROP_PRESENT:
322		if (pchg->pdata->get_batt_present)
323			val->intval = pchg->pdata->get_batt_present();
324		break;
325	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
326		if (pchg->pdata->get_batt_level)
327			val->intval = pchg->pdata->get_batt_level();
328		break;
329	case POWER_SUPPLY_PROP_CAPACITY:
330		if (pchg->pdata->get_batt_capacity)
331			val->intval = pchg->pdata->get_batt_capacity();
332		break;
333	case POWER_SUPPLY_PROP_TEMP:
334		if (pchg->pdata->get_batt_temp)
335			val->intval = pchg->pdata->get_batt_temp();
336		break;
337	default:
338		break;
339	}
340
341	return 0;
342}
343
344static void lp8727_charger_changed(struct power_supply *psy)
345{
346	struct lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent);
347	u8 val;
348	u8 eoc_level, ichg;
349
350	if (lp8727_is_charger_attached(psy->name, pchg->devid)) {
351		if (pchg->chg_parm) {
352			eoc_level = pchg->chg_parm->eoc_level;
353			ichg = pchg->chg_parm->ichg;
354			val = (ichg << 4) | eoc_level;
355			lp8727_i2c_write_byte(pchg, CHGCTRL2, &val);
356		}
357	}
358}
359
360static int lp8727_register_psy(struct lp8727_chg *pchg)
361{
362	struct lp8727_psy *psy;
363
364	psy = kzalloc(sizeof(*psy), GFP_KERNEL);
365	if (!psy)
366		goto err_mem;
367
368	pchg->psy = psy;
369
370	psy->ac.name = "ac";
371	psy->ac.type = POWER_SUPPLY_TYPE_MAINS;
372	psy->ac.properties = lp8727_charger_prop;
373	psy->ac.num_properties = ARRAY_SIZE(lp8727_charger_prop);
374	psy->ac.get_property = lp8727_charger_get_property;
375	psy->ac.supplied_to = battery_supplied_to;
376	psy->ac.num_supplicants = ARRAY_SIZE(battery_supplied_to);
377
378	if (power_supply_register(pchg->dev, &psy->ac))
379		goto err_psy;
380
381	psy->usb.name = "usb";
382	psy->usb.type = POWER_SUPPLY_TYPE_USB;
383	psy->usb.properties = lp8727_charger_prop;
384	psy->usb.num_properties = ARRAY_SIZE(lp8727_charger_prop);
385	psy->usb.get_property = lp8727_charger_get_property;
386	psy->usb.supplied_to = battery_supplied_to;
387	psy->usb.num_supplicants = ARRAY_SIZE(battery_supplied_to);
388
389	if (power_supply_register(pchg->dev, &psy->usb))
390		goto err_psy;
391
392	psy->batt.name = "main_batt";
393	psy->batt.type = POWER_SUPPLY_TYPE_BATTERY;
394	psy->batt.properties = lp8727_battery_prop;
395	psy->batt.num_properties = ARRAY_SIZE(lp8727_battery_prop);
396	psy->batt.get_property = lp8727_battery_get_property;
397	psy->batt.external_power_changed = lp8727_charger_changed;
398
399	if (power_supply_register(pchg->dev, &psy->batt))
400		goto err_psy;
401
402	return 0;
403
404err_mem:
405	return -ENOMEM;
406err_psy:
407	kfree(psy);
408	return -EPERM;
409}
410
411static void lp8727_unregister_psy(struct lp8727_chg *pchg)
412{
413	struct lp8727_psy *psy = pchg->psy;
414
415	if (!psy)
416		return;
417
418	power_supply_unregister(&psy->ac);
419	power_supply_unregister(&psy->usb);
420	power_supply_unregister(&psy->batt);
421	kfree(psy);
422}
423
424static int lp8727_probe(struct i2c_client *cl, const struct i2c_device_id *id)
425{
426	struct lp8727_chg *pchg;
427	int ret;
428
429	if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
430		return -EIO;
431
432	pchg = kzalloc(sizeof(*pchg), GFP_KERNEL);
433	if (!pchg)
434		return -ENOMEM;
435
436	pchg->client = cl;
437	pchg->dev = &cl->dev;
438	pchg->pdata = cl->dev.platform_data;
439	i2c_set_clientdata(cl, pchg);
440
441	mutex_init(&pchg->xfer_lock);
442
443	lp8727_init_device(pchg);
444	lp8727_intr_config(pchg);
445
446	ret = lp8727_register_psy(pchg);
447	if (ret)
448		dev_err(pchg->dev,
449			"can not register power supplies. err=%d", ret);
450
451	return 0;
452}
453
454static int __devexit lp8727_remove(struct i2c_client *cl)
455{
456	struct lp8727_chg *pchg = i2c_get_clientdata(cl);
457
458	lp8727_unregister_psy(pchg);
459	free_irq(pchg->client->irq, pchg);
460	flush_workqueue(pchg->irqthread);
461	destroy_workqueue(pchg->irqthread);
462	kfree(pchg);
463	return 0;
464}
465
466static const struct i2c_device_id lp8727_ids[] = {
467	{"lp8727", 0},
468	{ }
469};
470
471static struct i2c_driver lp8727_driver = {
472	.driver = {
473		   .name = "lp8727",
474		   },
475	.probe = lp8727_probe,
476	.remove = __devexit_p(lp8727_remove),
477	.id_table = lp8727_ids,
478};
479
480static int __init lp8727_init(void)
481{
482	return i2c_add_driver(&lp8727_driver);
483}
484
485static void __exit lp8727_exit(void)
486{
487	i2c_del_driver(&lp8727_driver);
488}
489
490module_init(lp8727_init);
491module_exit(lp8727_exit);
492
493MODULE_DESCRIPTION("TI/National Semiconductor LP8727 charger driver");
494MODULE_AUTHOR
495    ("Woogyom Kim <milo.kim@ti.com>, Daniel Jeong <daniel.jeong@ti.com>");
496MODULE_LICENSE("GPL");
497