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2165c8a4 WK |
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 | ||
ce09affc | 94 | static int lp8727_i2c_read(struct lp8727_chg *pchg, u8 reg, u8 *data, u8 len) |
2165c8a4 WK |
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 | ||
ce09affc | 105 | static int lp8727_i2c_write(struct lp8727_chg *pchg, u8 reg, u8 *data, u8 len) |
2165c8a4 WK |
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 | ||
116 | static inline int lp8727_i2c_read_byte(struct lp8727_chg *pchg, u8 reg, | |
ce09affc | 117 | u8 *data) |
2165c8a4 WK |
118 | { |
119 | return lp8727_i2c_read(pchg, reg, data, 1); | |
120 | } | |
121 | ||
122 | static inline int lp8727_i2c_write_byte(struct lp8727_chg *pchg, u8 reg, | |
ce09affc | 123 | u8 *data) |
2165c8a4 WK |
124 | { |
125 | return lp8727_i2c_write(pchg, reg, data, 1); | |
126 | } | |
127 | ||
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 | ||
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 | ||
153 | static int lp8727_is_dedicated_charger(struct lp8727_chg *pchg) | |
154 | { | |
155 | u8 val; | |
ce09affc | 156 | lp8727_i2c_read_byte(pchg, STATUS1, &val); |
2165c8a4 WK |
157 | return (val & DCPORT); |
158 | } | |
159 | ||
160 | static int lp8727_is_usb_charger(struct lp8727_chg *pchg) | |
161 | { | |
162 | u8 val; | |
ce09affc | 163 | lp8727_i2c_read_byte(pchg, STATUS1, &val); |
2165c8a4 WK |
164 | return (val & CHPORT); |
165 | } | |
166 | ||
167 | static void lp8727_ctrl_switch(struct lp8727_chg *pchg, u8 sw) | |
168 | { | |
169 | u8 val = sw; | |
ce09affc | 170 | lp8727_i2c_write_byte(pchg, SWCTRL, &val); |
2165c8a4 WK |
171 | } |
172 | ||
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 | ||
206 | static void lp8727_enable_chgdet(struct lp8727_chg *pchg) | |
207 | { | |
208 | u8 val; | |
209 | ||
ce09affc | 210 | lp8727_i2c_read_byte(pchg, CTRL2, &val); |
2165c8a4 | 211 | val |= CHGDET_EN; |
ce09affc | 212 | lp8727_i2c_write_byte(pchg, CTRL2, &val); |
2165c8a4 WK |
213 | } |
214 | ||
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 | ||
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 | ||
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 | ||
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 | ||
ce09affc | 286 | if (psp == POWER_SUPPLY_PROP_ONLINE) |
2165c8a4 WK |
287 | val->intval = lp8727_is_charger_attached(psy->name, |
288 | pchg->devid); | |
2165c8a4 WK |
289 | |
290 | return 0; | |
291 | } | |
292 | ||
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)) { | |
ce09affc | 303 | lp8727_i2c_read_byte(pchg, STATUS1, &read); |
2165c8a4 WK |
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: | |
ce09affc | 313 | lp8727_i2c_read_byte(pchg, STATUS2, &read); |
2165c8a4 WK |
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 | ||
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; | |
ce09affc | 354 | lp8727_i2c_write_byte(pchg, CHGCTRL2, &val); |
2165c8a4 WK |
355 | } |
356 | } | |
357 | } | |
358 | ||
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 | ||
410 | static void lp8727_unregister_psy(struct lp8727_chg *pchg) | |
411 | { | |
412 | struct lp8727_psy *psy = pchg->psy; | |
413 | ||
ce09affc KM |
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); | |
2165c8a4 WK |
421 | } |
422 | ||
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 | ||
998a8e7a KM |
428 | if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) |
429 | return -EIO; | |
430 | ||
2165c8a4 WK |
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); | |
ce09affc | 446 | if (ret) |
2165c8a4 WK |
447 | dev_err(pchg->dev, |
448 | "can not register power supplies. err=%d", ret); | |
2165c8a4 WK |
449 | |
450 | return 0; | |
451 | } | |
452 | ||
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}, | |
455a0e2c | 467 | { } |
2165c8a4 WK |
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 | ||
479 | static int __init lp8727_init(void) | |
480 | { | |
481 | return i2c_add_driver(&lp8727_driver); | |
482 | } | |
483 | ||
ce09affc | 484 | static void __exit lp8727_exit(void) |
2165c8a4 WK |
485 | { |
486 | i2c_del_driver(&lp8727_driver); | |
487 | } | |
488 | ||
489 | module_init(lp8727_init); | |
ce09affc | 490 | module_exit(lp8727_exit); |
2165c8a4 WK |
491 | |
492 | MODULE_DESCRIPTION("National Semiconductor LP8727 charger driver"); | |
ce09affc KM |
493 | MODULE_AUTHOR |
494 | ("Woogyom Kim <milo.kim@ti.com>, Daniel Jeong <daniel.jeong@ti.com>"); | |
2165c8a4 | 495 | MODULE_LICENSE("GPL"); |