Commit | Line | Data |
---|---|---|
2165c8a4 | 1 | /* |
f7bae49a | 2 | * Driver for LP8727 Micro/Mini USB IC with integrated charger |
2165c8a4 | 3 | * |
e39b828f | 4 | * Copyright (C) 2011 Texas Instruments |
2165c8a4 WK |
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> | |
1aebb097 | 18 | #include <linux/platform_data/lp8727.h> |
2165c8a4 | 19 | |
60fd57e0 | 20 | #define DEFAULT_DEBOUNCE_MSEC 270 |
2165c8a4 WK |
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 | |
7336880e | 29 | #define STATUS2 0x7 |
2165c8a4 WK |
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 | ||
61 | enum 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 | ||
70 | enum lp8727_chg_stat { | |
71 | PRECHG, | |
72 | CC, | |
73 | CV, | |
74 | EOC, | |
75 | }; | |
76 | ||
77 | struct lp8727_psy { | |
78 | struct power_supply ac; | |
79 | struct power_supply usb; | |
80 | struct power_supply batt; | |
81 | }; | |
82 | ||
83 | struct lp8727_chg { | |
84 | struct device *dev; | |
85 | struct i2c_client *client; | |
86 | struct mutex xfer_lock; | |
87 | struct delayed_work work; | |
2165c8a4 WK |
88 | struct lp8727_platform_data *pdata; |
89 | struct lp8727_psy *psy; | |
90 | struct lp8727_chg_param *chg_parm; | |
91 | enum lp8727_dev_id devid; | |
60fd57e0 | 92 | unsigned long debounce_jiffies; |
d71fda01 | 93 | int irq; |
2165c8a4 WK |
94 | }; |
95 | ||
27aefa3b | 96 | static int lp8727_read_bytes(struct lp8727_chg *pchg, u8 reg, u8 *data, u8 len) |
2165c8a4 WK |
97 | { |
98 | s32 ret; | |
99 | ||
100 | mutex_lock(&pchg->xfer_lock); | |
101 | ret = i2c_smbus_read_i2c_block_data(pchg->client, reg, len, data); | |
102 | mutex_unlock(&pchg->xfer_lock); | |
103 | ||
104 | return (ret != len) ? -EIO : 0; | |
105 | } | |
106 | ||
27aefa3b | 107 | static inline int lp8727_read_byte(struct lp8727_chg *pchg, u8 reg, u8 *data) |
2165c8a4 | 108 | { |
27aefa3b KM |
109 | return lp8727_read_bytes(pchg, reg, data, 1); |
110 | } | |
111 | ||
112 | static int lp8727_write_byte(struct lp8727_chg *pchg, u8 reg, u8 data) | |
113 | { | |
114 | int ret; | |
2165c8a4 WK |
115 | |
116 | mutex_lock(&pchg->xfer_lock); | |
27aefa3b | 117 | ret = i2c_smbus_write_byte_data(pchg->client, reg, data); |
2165c8a4 WK |
118 | mutex_unlock(&pchg->xfer_lock); |
119 | ||
120 | return ret; | |
121 | } | |
122 | ||
2165c8a4 WK |
123 | static int lp8727_is_charger_attached(const char *name, int id) |
124 | { | |
125 | if (name) { | |
126 | if (!strcmp(name, "ac")) | |
127 | return (id == ID_TA || id == ID_DEDICATED_CHG) ? 1 : 0; | |
128 | else if (!strcmp(name, "usb")) | |
129 | return (id == ID_USB_CHG) ? 1 : 0; | |
130 | } | |
131 | ||
132 | return (id >= ID_TA && id <= ID_USB_CHG) ? 1 : 0; | |
133 | } | |
134 | ||
7da6334e | 135 | static int lp8727_init_device(struct lp8727_chg *pchg) |
2165c8a4 WK |
136 | { |
137 | u8 val; | |
7da6334e | 138 | int ret; |
2165c8a4 WK |
139 | |
140 | val = ID200_EN | ADC_EN | CP_EN; | |
27aefa3b | 141 | ret = lp8727_write_byte(pchg, CTRL1, val); |
7da6334e KM |
142 | if (ret) |
143 | return ret; | |
2165c8a4 WK |
144 | |
145 | val = INT_EN | CHGDET_EN; | |
27aefa3b | 146 | ret = lp8727_write_byte(pchg, CTRL2, val); |
7da6334e KM |
147 | if (ret) |
148 | return ret; | |
149 | ||
150 | return 0; | |
2165c8a4 WK |
151 | } |
152 | ||
153 | static int lp8727_is_dedicated_charger(struct lp8727_chg *pchg) | |
154 | { | |
155 | u8 val; | |
27aefa3b | 156 | lp8727_read_byte(pchg, STATUS1, &val); |
7336880e | 157 | return val & DCPORT; |
2165c8a4 WK |
158 | } |
159 | ||
160 | static int lp8727_is_usb_charger(struct lp8727_chg *pchg) | |
161 | { | |
162 | u8 val; | |
27aefa3b | 163 | lp8727_read_byte(pchg, STATUS1, &val); |
7336880e | 164 | return val & CHPORT; |
2165c8a4 WK |
165 | } |
166 | ||
167 | static void lp8727_ctrl_switch(struct lp8727_chg *pchg, u8 sw) | |
168 | { | |
27aefa3b | 169 | lp8727_write_byte(pchg, SWCTRL, sw); |
2165c8a4 WK |
170 | } |
171 | ||
172 | static void lp8727_id_detection(struct lp8727_chg *pchg, u8 id, int vbusin) | |
173 | { | |
318cb389 | 174 | struct lp8727_platform_data *pdata = pchg->pdata; |
2165c8a4 WK |
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; | |
318cb389 | 181 | pchg->chg_parm = pdata ? pdata->ac : NULL; |
2165c8a4 WK |
182 | break; |
183 | case 0xB: | |
184 | if (lp8727_is_dedicated_charger(pchg)) { | |
318cb389 | 185 | pchg->chg_parm = pdata ? pdata->ac : NULL; |
2165c8a4 WK |
186 | devid = ID_DEDICATED_CHG; |
187 | } else if (lp8727_is_usb_charger(pchg)) { | |
318cb389 | 188 | pchg->chg_parm = pdata ? pdata->usb : NULL; |
2165c8a4 WK |
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 | ||
27aefa3b | 210 | lp8727_read_byte(pchg, CTRL2, &val); |
2165c8a4 | 211 | val |= CHGDET_EN; |
27aefa3b | 212 | lp8727_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 | ||
27aefa3b | 221 | if (lp8727_read_bytes(pchg, INT1, intstat, 2)) { |
2165c8a4 WK |
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; | |
2165c8a4 | 240 | |
2a092582 | 241 | schedule_delayed_work(&pchg->work, pchg->debounce_jiffies); |
2165c8a4 WK |
242 | return IRQ_HANDLED; |
243 | } | |
244 | ||
d71fda01 | 245 | static int lp8727_setup_irq(struct lp8727_chg *pchg) |
2165c8a4 | 246 | { |
d71fda01 KM |
247 | int ret; |
248 | int irq = pchg->client->irq; | |
60fd57e0 KM |
249 | unsigned delay_msec = pchg->pdata ? pchg->pdata->debounce_msec : |
250 | DEFAULT_DEBOUNCE_MSEC; | |
251 | ||
2165c8a4 WK |
252 | INIT_DELAYED_WORK(&pchg->work, lp8727_delayed_func); |
253 | ||
d71fda01 KM |
254 | if (irq <= 0) { |
255 | dev_warn(pchg->dev, "invalid irq number: %d\n", irq); | |
256 | return 0; | |
257 | } | |
60fd57e0 | 258 | |
d71fda01 | 259 | ret = request_threaded_irq(irq, NULL, lp8727_isr_func, |
7c577c0d | 260 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, |
d71fda01 KM |
261 | "lp8727_irq", pchg); |
262 | ||
263 | if (ret) | |
264 | return ret; | |
265 | ||
266 | pchg->irq = irq; | |
267 | pchg->debounce_jiffies = msecs_to_jiffies(delay_msec); | |
268 | ||
269 | return 0; | |
270 | } | |
271 | ||
272 | static void lp8727_release_irq(struct lp8727_chg *pchg) | |
273 | { | |
274 | cancel_delayed_work_sync(&pchg->work); | |
275 | ||
276 | if (pchg->irq) | |
277 | free_irq(pchg->irq, pchg); | |
2165c8a4 WK |
278 | } |
279 | ||
280 | static enum power_supply_property lp8727_charger_prop[] = { | |
281 | POWER_SUPPLY_PROP_ONLINE, | |
282 | }; | |
283 | ||
284 | static enum power_supply_property lp8727_battery_prop[] = { | |
285 | POWER_SUPPLY_PROP_STATUS, | |
286 | POWER_SUPPLY_PROP_HEALTH, | |
287 | POWER_SUPPLY_PROP_PRESENT, | |
288 | POWER_SUPPLY_PROP_VOLTAGE_NOW, | |
289 | POWER_SUPPLY_PROP_CAPACITY, | |
290 | POWER_SUPPLY_PROP_TEMP, | |
291 | }; | |
292 | ||
293 | static char *battery_supplied_to[] = { | |
294 | "main_batt", | |
295 | }; | |
296 | ||
297 | static int lp8727_charger_get_property(struct power_supply *psy, | |
298 | enum power_supply_property psp, | |
299 | union power_supply_propval *val) | |
300 | { | |
301 | struct lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent); | |
302 | ||
ce09affc | 303 | if (psp == POWER_SUPPLY_PROP_ONLINE) |
2165c8a4 WK |
304 | val->intval = lp8727_is_charger_attached(psy->name, |
305 | pchg->devid); | |
2165c8a4 WK |
306 | |
307 | return 0; | |
308 | } | |
309 | ||
310 | static int lp8727_battery_get_property(struct power_supply *psy, | |
311 | enum power_supply_property psp, | |
312 | union power_supply_propval *val) | |
313 | { | |
314 | struct lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent); | |
318cb389 | 315 | struct lp8727_platform_data *pdata = pchg->pdata; |
2165c8a4 WK |
316 | u8 read; |
317 | ||
318 | switch (psp) { | |
319 | case POWER_SUPPLY_PROP_STATUS: | |
320 | if (lp8727_is_charger_attached(psy->name, pchg->devid)) { | |
27aefa3b | 321 | lp8727_read_byte(pchg, STATUS1, &read); |
2165c8a4 WK |
322 | if (((read & CHGSTAT) >> 4) == EOC) |
323 | val->intval = POWER_SUPPLY_STATUS_FULL; | |
324 | else | |
325 | val->intval = POWER_SUPPLY_STATUS_CHARGING; | |
326 | } else { | |
327 | val->intval = POWER_SUPPLY_STATUS_DISCHARGING; | |
328 | } | |
329 | break; | |
330 | case POWER_SUPPLY_PROP_HEALTH: | |
27aefa3b | 331 | lp8727_read_byte(pchg, STATUS2, &read); |
2165c8a4 WK |
332 | read = (read & TEMP_STAT) >> 5; |
333 | if (read >= 0x1 && read <= 0x3) | |
334 | val->intval = POWER_SUPPLY_HEALTH_OVERHEAT; | |
335 | else | |
336 | val->intval = POWER_SUPPLY_HEALTH_GOOD; | |
337 | break; | |
338 | case POWER_SUPPLY_PROP_PRESENT: | |
318cb389 KM |
339 | if (!pdata) |
340 | return -EINVAL; | |
341 | ||
342 | if (pdata->get_batt_present) | |
2165c8a4 WK |
343 | val->intval = pchg->pdata->get_batt_present(); |
344 | break; | |
345 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: | |
318cb389 KM |
346 | if (!pdata) |
347 | return -EINVAL; | |
348 | ||
349 | if (pdata->get_batt_level) | |
2165c8a4 WK |
350 | val->intval = pchg->pdata->get_batt_level(); |
351 | break; | |
352 | case POWER_SUPPLY_PROP_CAPACITY: | |
318cb389 KM |
353 | if (!pdata) |
354 | return -EINVAL; | |
355 | ||
356 | if (pdata->get_batt_capacity) | |
2165c8a4 WK |
357 | val->intval = pchg->pdata->get_batt_capacity(); |
358 | break; | |
359 | case POWER_SUPPLY_PROP_TEMP: | |
318cb389 KM |
360 | if (!pdata) |
361 | return -EINVAL; | |
362 | ||
363 | if (pdata->get_batt_temp) | |
2165c8a4 WK |
364 | val->intval = pchg->pdata->get_batt_temp(); |
365 | break; | |
366 | default: | |
367 | break; | |
368 | } | |
369 | ||
370 | return 0; | |
371 | } | |
372 | ||
373 | static void lp8727_charger_changed(struct power_supply *psy) | |
374 | { | |
375 | struct lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent); | |
376 | u8 val; | |
377 | u8 eoc_level, ichg; | |
378 | ||
379 | if (lp8727_is_charger_attached(psy->name, pchg->devid)) { | |
380 | if (pchg->chg_parm) { | |
381 | eoc_level = pchg->chg_parm->eoc_level; | |
382 | ichg = pchg->chg_parm->ichg; | |
383 | val = (ichg << 4) | eoc_level; | |
27aefa3b | 384 | lp8727_write_byte(pchg, CHGCTRL2, val); |
2165c8a4 WK |
385 | } |
386 | } | |
387 | } | |
388 | ||
389 | static int lp8727_register_psy(struct lp8727_chg *pchg) | |
390 | { | |
391 | struct lp8727_psy *psy; | |
392 | ||
74727c57 | 393 | psy = devm_kzalloc(pchg->dev, sizeof(*psy), GFP_KERNEL); |
2165c8a4 | 394 | if (!psy) |
6297b5e5 | 395 | return -ENOMEM; |
2165c8a4 WK |
396 | |
397 | pchg->psy = psy; | |
398 | ||
399 | psy->ac.name = "ac"; | |
400 | psy->ac.type = POWER_SUPPLY_TYPE_MAINS; | |
401 | psy->ac.properties = lp8727_charger_prop; | |
402 | psy->ac.num_properties = ARRAY_SIZE(lp8727_charger_prop); | |
403 | psy->ac.get_property = lp8727_charger_get_property; | |
404 | psy->ac.supplied_to = battery_supplied_to; | |
405 | psy->ac.num_supplicants = ARRAY_SIZE(battery_supplied_to); | |
406 | ||
407 | if (power_supply_register(pchg->dev, &psy->ac)) | |
6297b5e5 | 408 | goto err_psy_ac; |
2165c8a4 WK |
409 | |
410 | psy->usb.name = "usb"; | |
411 | psy->usb.type = POWER_SUPPLY_TYPE_USB; | |
412 | psy->usb.properties = lp8727_charger_prop; | |
413 | psy->usb.num_properties = ARRAY_SIZE(lp8727_charger_prop); | |
414 | psy->usb.get_property = lp8727_charger_get_property; | |
415 | psy->usb.supplied_to = battery_supplied_to; | |
416 | psy->usb.num_supplicants = ARRAY_SIZE(battery_supplied_to); | |
417 | ||
418 | if (power_supply_register(pchg->dev, &psy->usb)) | |
6297b5e5 | 419 | goto err_psy_usb; |
2165c8a4 WK |
420 | |
421 | psy->batt.name = "main_batt"; | |
422 | psy->batt.type = POWER_SUPPLY_TYPE_BATTERY; | |
423 | psy->batt.properties = lp8727_battery_prop; | |
424 | psy->batt.num_properties = ARRAY_SIZE(lp8727_battery_prop); | |
425 | psy->batt.get_property = lp8727_battery_get_property; | |
426 | psy->batt.external_power_changed = lp8727_charger_changed; | |
427 | ||
428 | if (power_supply_register(pchg->dev, &psy->batt)) | |
6297b5e5 | 429 | goto err_psy_batt; |
2165c8a4 WK |
430 | |
431 | return 0; | |
432 | ||
6297b5e5 DN |
433 | err_psy_batt: |
434 | power_supply_unregister(&psy->usb); | |
435 | err_psy_usb: | |
436 | power_supply_unregister(&psy->ac); | |
437 | err_psy_ac: | |
2165c8a4 WK |
438 | return -EPERM; |
439 | } | |
440 | ||
441 | static void lp8727_unregister_psy(struct lp8727_chg *pchg) | |
442 | { | |
443 | struct lp8727_psy *psy = pchg->psy; | |
444 | ||
ce09affc KM |
445 | if (!psy) |
446 | return; | |
447 | ||
448 | power_supply_unregister(&psy->ac); | |
449 | power_supply_unregister(&psy->usb); | |
450 | power_supply_unregister(&psy->batt); | |
2165c8a4 WK |
451 | } |
452 | ||
453 | static int lp8727_probe(struct i2c_client *cl, const struct i2c_device_id *id) | |
454 | { | |
455 | struct lp8727_chg *pchg; | |
456 | int ret; | |
457 | ||
998a8e7a KM |
458 | if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) |
459 | return -EIO; | |
460 | ||
74727c57 | 461 | pchg = devm_kzalloc(&cl->dev, sizeof(*pchg), GFP_KERNEL); |
2165c8a4 WK |
462 | if (!pchg) |
463 | return -ENOMEM; | |
464 | ||
465 | pchg->client = cl; | |
466 | pchg->dev = &cl->dev; | |
467 | pchg->pdata = cl->dev.platform_data; | |
468 | i2c_set_clientdata(cl, pchg); | |
469 | ||
470 | mutex_init(&pchg->xfer_lock); | |
471 | ||
7da6334e KM |
472 | ret = lp8727_init_device(pchg); |
473 | if (ret) { | |
474 | dev_err(pchg->dev, "i2c communication err: %d", ret); | |
fb9adc51 | 475 | return ret; |
7da6334e KM |
476 | } |
477 | ||
fb9adc51 | 478 | ret = lp8727_register_psy(pchg); |
7da6334e | 479 | if (ret) { |
fb9adc51 KM |
480 | dev_err(pchg->dev, "power supplies register err: %d", ret); |
481 | return ret; | |
7da6334e | 482 | } |
2165c8a4 | 483 | |
d71fda01 | 484 | ret = lp8727_setup_irq(pchg); |
7da6334e | 485 | if (ret) { |
fb9adc51 KM |
486 | dev_err(pchg->dev, "irq handler err: %d", ret); |
487 | lp8727_unregister_psy(pchg); | |
488 | return ret; | |
7da6334e | 489 | } |
2165c8a4 WK |
490 | |
491 | return 0; | |
492 | } | |
493 | ||
494 | static int __devexit lp8727_remove(struct i2c_client *cl) | |
495 | { | |
496 | struct lp8727_chg *pchg = i2c_get_clientdata(cl); | |
497 | ||
d71fda01 | 498 | lp8727_release_irq(pchg); |
fb9adc51 | 499 | lp8727_unregister_psy(pchg); |
2165c8a4 WK |
500 | return 0; |
501 | } | |
502 | ||
503 | static const struct i2c_device_id lp8727_ids[] = { | |
504 | {"lp8727", 0}, | |
455a0e2c | 505 | { } |
2165c8a4 | 506 | }; |
e2c5f7db | 507 | MODULE_DEVICE_TABLE(i2c, lp8727_ids); |
2165c8a4 WK |
508 | |
509 | static struct i2c_driver lp8727_driver = { | |
510 | .driver = { | |
511 | .name = "lp8727", | |
512 | }, | |
513 | .probe = lp8727_probe, | |
514 | .remove = __devexit_p(lp8727_remove), | |
515 | .id_table = lp8727_ids, | |
516 | }; | |
5ff92e7a | 517 | module_i2c_driver(lp8727_driver); |
2165c8a4 | 518 | |
e39b828f | 519 | MODULE_DESCRIPTION("TI/National Semiconductor LP8727 charger driver"); |
7336880e KM |
520 | MODULE_AUTHOR("Woogyom Kim <milo.kim@ti.com>, " |
521 | "Daniel Jeong <daniel.jeong@ti.com>"); | |
2165c8a4 | 522 | MODULE_LICENSE("GPL"); |