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21#include <linux/kernel.h>
22#include <linux/module.h>
23#include <linux/err.h>
24#include <linux/init.h>
25#include <linux/types.h>
26#include <linux/device.h>
27#include <linux/sysfs.h>
28#include <linux/platform_device.h>
29#include <linux/power_supply.h>
30#include <linux/delay.h>
31
32#include <linux/usb/otg.h>
33#include <linux/usb/ulpi.h>
34#include <linux/usb/ch9.h>
35#include <linux/usb/gadget.h>
36#include <linux/power/isp1704_charger.h>
37
38
39#define ISP1704_PWR_CTRL 0x3d
40#define ISP1704_PWR_CTRL_SWCTRL (1 << 0)
41#define ISP1704_PWR_CTRL_DET_COMP (1 << 1)
42#define ISP1704_PWR_CTRL_BVALID_RISE (1 << 2)
43#define ISP1704_PWR_CTRL_BVALID_FALL (1 << 3)
44#define ISP1704_PWR_CTRL_DP_WKPU_EN (1 << 4)
45#define ISP1704_PWR_CTRL_VDAT_DET (1 << 5)
46#define ISP1704_PWR_CTRL_DPVSRC_EN (1 << 6)
47#define ISP1704_PWR_CTRL_HWDETECT (1 << 7)
48
49#define NXP_VENDOR_ID 0x04cc
50
51static u16 isp170x_id[] = {
52 0x1704,
53 0x1707,
54};
55
56struct isp1704_charger {
57 struct device *dev;
58 struct power_supply psy;
59 struct usb_phy *phy;
60 struct notifier_block nb;
61 struct work_struct work;
62
63
64 char model[8];
65 unsigned present:1;
66 unsigned online:1;
67 unsigned current_max;
68
69
70 unsigned long event;
71 unsigned max_power;
72};
73
74static inline int isp1704_read(struct isp1704_charger *isp, u32 reg)
75{
76 return usb_phy_io_read(isp->phy, reg);
77}
78
79static inline int isp1704_write(struct isp1704_charger *isp, u32 val, u32 reg)
80{
81 return usb_phy_io_write(isp->phy, val, reg);
82}
83
84
85
86
87
88static void isp1704_charger_set_power(struct isp1704_charger *isp, bool on)
89{
90 struct isp1704_charger_data *board = isp->dev->platform_data;
91
92 if (board && board->set_power)
93 board->set_power(on);
94}
95
96
97
98
99
100
101
102
103static inline int isp1704_charger_type(struct isp1704_charger *isp)
104{
105 u8 reg;
106 u8 func_ctrl;
107 u8 otg_ctrl;
108 int type = POWER_SUPPLY_TYPE_USB_DCP;
109
110 func_ctrl = isp1704_read(isp, ULPI_FUNC_CTRL);
111 otg_ctrl = isp1704_read(isp, ULPI_OTG_CTRL);
112
113
114 reg = ULPI_OTG_CTRL_DM_PULLDOWN | ULPI_OTG_CTRL_DP_PULLDOWN;
115 isp1704_write(isp, ULPI_CLR(ULPI_OTG_CTRL), reg);
116
117
118 isp1704_write(isp, ULPI_CLR(ULPI_FUNC_CTRL),
119 ULPI_FUNC_CTRL_XCVRSEL_MASK);
120 isp1704_write(isp, ULPI_SET(ULPI_FUNC_CTRL),
121 ULPI_FUNC_CTRL_FULL_SPEED);
122
123
124 reg = ULPI_FUNC_CTRL_TERMSELECT | ULPI_FUNC_CTRL_RESET;
125 isp1704_write(isp, ULPI_SET(ULPI_FUNC_CTRL), reg);
126 usleep_range(1000, 2000);
127
128 reg = isp1704_read(isp, ULPI_DEBUG);
129 if ((reg & 3) != 3)
130 type = POWER_SUPPLY_TYPE_USB_CDP;
131
132
133 isp1704_write(isp, ULPI_FUNC_CTRL, func_ctrl);
134 isp1704_write(isp, ULPI_OTG_CTRL, otg_ctrl);
135
136 return type;
137}
138
139
140
141
142
143static inline int isp1704_charger_verify(struct isp1704_charger *isp)
144{
145 int ret = 0;
146 u8 r;
147
148
149 r = isp1704_read(isp, ULPI_FUNC_CTRL);
150 r |= ULPI_FUNC_CTRL_RESET;
151 isp1704_write(isp, ULPI_FUNC_CTRL, r);
152 usleep_range(1000, 2000);
153
154
155 r &= ~(ULPI_FUNC_CTRL_RESET | ULPI_FUNC_CTRL_OPMODE_MASK);
156 isp1704_write(isp, ULPI_FUNC_CTRL, r);
157
158
159 r = ULPI_OTG_CTRL_DP_PULLDOWN | ULPI_OTG_CTRL_DM_PULLDOWN;
160 isp1704_write(isp, ULPI_CLR(ULPI_OTG_CTRL), r);
161
162
163 r = ULPI_FUNC_CTRL_TERMSELECT | ULPI_FUNC_CTRL_RESET;
164 isp1704_write(isp, ULPI_SET(ULPI_FUNC_CTRL), r);
165 usleep_range(1000, 2000);
166
167
168 if (!isp1704_read(isp, ULPI_DEBUG)) {
169
170 isp1704_write(isp, ULPI_CLR(ULPI_FUNC_CTRL),
171 ULPI_FUNC_CTRL_TERMSELECT);
172 return 1;
173 }
174
175
176
177
178 isp1704_write(isp, ULPI_SET(ISP1704_PWR_CTRL),
179 ISP1704_PWR_CTRL_DP_WKPU_EN);
180
181
182 isp1704_write(isp, ULPI_CLR(ULPI_FUNC_CTRL),
183 ULPI_FUNC_CTRL_TERMSELECT);
184
185
186 isp1704_write(isp, ULPI_SET(ULPI_OTG_CTRL),
187 ULPI_OTG_CTRL_DM_PULLDOWN);
188
189
190 if (!(isp1704_read(isp, ULPI_DEBUG)))
191 ret = 1;
192
193
194 isp1704_write(isp, ULPI_CLR(ISP1704_PWR_CTRL),
195 ISP1704_PWR_CTRL_DP_WKPU_EN);
196
197 return ret;
198}
199
200static inline int isp1704_charger_detect(struct isp1704_charger *isp)
201{
202 unsigned long timeout;
203 u8 pwr_ctrl;
204 int ret = 0;
205
206 pwr_ctrl = isp1704_read(isp, ISP1704_PWR_CTRL);
207
208
209 isp1704_write(isp, ISP1704_PWR_CTRL,
210 ISP1704_PWR_CTRL_SWCTRL);
211
212
213 isp1704_write(isp, ULPI_SET(ISP1704_PWR_CTRL),
214 ISP1704_PWR_CTRL_SWCTRL
215 | ISP1704_PWR_CTRL_DPVSRC_EN);
216 usleep_range(1000, 2000);
217
218 timeout = jiffies + msecs_to_jiffies(300);
219 do {
220
221 if (isp1704_read(isp, ISP1704_PWR_CTRL)
222 & ISP1704_PWR_CTRL_VDAT_DET) {
223 ret = isp1704_charger_verify(isp);
224 break;
225 }
226 } while (!time_after(jiffies, timeout) && isp->online);
227
228
229 isp1704_write(isp, ISP1704_PWR_CTRL, pwr_ctrl);
230
231 return ret;
232}
233
234static void isp1704_charger_work(struct work_struct *data)
235{
236 int detect;
237 unsigned long event;
238 unsigned power;
239 struct isp1704_charger *isp =
240 container_of(data, struct isp1704_charger, work);
241 static DEFINE_MUTEX(lock);
242
243 event = isp->event;
244 power = isp->max_power;
245
246 mutex_lock(&lock);
247
248 if (event != USB_EVENT_NONE)
249 isp1704_charger_set_power(isp, 1);
250
251 switch (event) {
252 case USB_EVENT_VBUS:
253 isp->online = true;
254
255
256 detect = isp1704_charger_detect(isp);
257
258 if (detect) {
259 isp->present = detect;
260 isp->psy.type = isp1704_charger_type(isp);
261 }
262
263 switch (isp->psy.type) {
264 case POWER_SUPPLY_TYPE_USB_DCP:
265 isp->current_max = 1800;
266 break;
267 case POWER_SUPPLY_TYPE_USB_CDP:
268
269
270
271
272 isp->current_max = 500;
273
274 case POWER_SUPPLY_TYPE_USB:
275 default:
276
277 if (isp->phy->otg->gadget)
278 usb_gadget_connect(isp->phy->otg->gadget);
279 }
280 break;
281 case USB_EVENT_NONE:
282 isp->online = false;
283 isp->current_max = 0;
284 isp->present = 0;
285 isp->current_max = 0;
286 isp->psy.type = POWER_SUPPLY_TYPE_USB;
287
288
289
290
291
292
293
294
295
296 if (isp->phy->otg->gadget)
297 usb_gadget_disconnect(isp->phy->otg->gadget);
298
299 isp1704_charger_set_power(isp, 0);
300 break;
301 case USB_EVENT_ENUMERATED:
302 if (isp->present)
303 isp->current_max = 1800;
304 else
305 isp->current_max = power;
306 break;
307 default:
308 goto out;
309 }
310
311 power_supply_changed(&isp->psy);
312out:
313 mutex_unlock(&lock);
314}
315
316static int isp1704_notifier_call(struct notifier_block *nb,
317 unsigned long event, void *power)
318{
319 struct isp1704_charger *isp =
320 container_of(nb, struct isp1704_charger, nb);
321
322 isp->event = event;
323
324 if (power)
325 isp->max_power = *((unsigned *)power);
326
327 schedule_work(&isp->work);
328
329 return NOTIFY_OK;
330}
331
332static int isp1704_charger_get_property(struct power_supply *psy,
333 enum power_supply_property psp,
334 union power_supply_propval *val)
335{
336 struct isp1704_charger *isp =
337 container_of(psy, struct isp1704_charger, psy);
338
339 switch (psp) {
340 case POWER_SUPPLY_PROP_PRESENT:
341 val->intval = isp->present;
342 break;
343 case POWER_SUPPLY_PROP_ONLINE:
344 val->intval = isp->online;
345 break;
346 case POWER_SUPPLY_PROP_CURRENT_MAX:
347 val->intval = isp->current_max;
348 break;
349 case POWER_SUPPLY_PROP_MODEL_NAME:
350 val->strval = isp->model;
351 break;
352 case POWER_SUPPLY_PROP_MANUFACTURER:
353 val->strval = "NXP";
354 break;
355 default:
356 return -EINVAL;
357 }
358 return 0;
359}
360
361static enum power_supply_property power_props[] = {
362 POWER_SUPPLY_PROP_PRESENT,
363 POWER_SUPPLY_PROP_ONLINE,
364 POWER_SUPPLY_PROP_CURRENT_MAX,
365 POWER_SUPPLY_PROP_MODEL_NAME,
366 POWER_SUPPLY_PROP_MANUFACTURER,
367};
368
369static inline int isp1704_test_ulpi(struct isp1704_charger *isp)
370{
371 int vendor;
372 int product;
373 int i;
374 int ret = -ENODEV;
375
376
377 ret = isp1704_write(isp, ULPI_SCRATCH, 0xaa);
378 if (ret < 0)
379 return ret;
380
381 ret = isp1704_read(isp, ULPI_SCRATCH);
382 if (ret < 0)
383 return ret;
384
385 if (ret != 0xaa)
386 return -ENODEV;
387
388
389 vendor = isp1704_read(isp, ULPI_VENDOR_ID_LOW);
390 vendor |= isp1704_read(isp, ULPI_VENDOR_ID_HIGH) << 8;
391 if (vendor != NXP_VENDOR_ID)
392 return -ENODEV;
393
394 product = isp1704_read(isp, ULPI_PRODUCT_ID_LOW);
395 product |= isp1704_read(isp, ULPI_PRODUCT_ID_HIGH) << 8;
396
397 for (i = 0; i < ARRAY_SIZE(isp170x_id); i++) {
398 if (product == isp170x_id[i]) {
399 sprintf(isp->model, "isp%x", product);
400 return product;
401 }
402 }
403
404 dev_err(isp->dev, "product id %x not matching known ids", product);
405
406 return -ENODEV;
407}
408
409static int isp1704_charger_probe(struct platform_device *pdev)
410{
411 struct isp1704_charger *isp;
412 int ret = -ENODEV;
413
414 isp = devm_kzalloc(&pdev->dev, sizeof(*isp), GFP_KERNEL);
415 if (!isp)
416 return -ENOMEM;
417
418 isp->phy = usb_get_phy(USB_PHY_TYPE_USB2);
419 if (IS_ERR_OR_NULL(isp->phy))
420 goto fail0;
421
422 isp->dev = &pdev->dev;
423 platform_set_drvdata(pdev, isp);
424
425 isp1704_charger_set_power(isp, 1);
426
427 ret = isp1704_test_ulpi(isp);
428 if (ret < 0)
429 goto fail1;
430
431 isp->psy.name = "isp1704";
432 isp->psy.type = POWER_SUPPLY_TYPE_USB;
433 isp->psy.properties = power_props;
434 isp->psy.num_properties = ARRAY_SIZE(power_props);
435 isp->psy.get_property = isp1704_charger_get_property;
436
437 ret = power_supply_register(isp->dev, &isp->psy);
438 if (ret)
439 goto fail1;
440
441
442
443
444
445 INIT_WORK(&isp->work, isp1704_charger_work);
446
447 isp->nb.notifier_call = isp1704_notifier_call;
448
449 ret = usb_register_notifier(isp->phy, &isp->nb);
450 if (ret)
451 goto fail2;
452
453 dev_info(isp->dev, "registered with product id %s\n", isp->model);
454
455
456
457
458
459
460
461
462 if (isp->phy->otg->gadget)
463 usb_gadget_disconnect(isp->phy->otg->gadget);
464
465
466 ret = isp1704_read(isp, ULPI_USB_INT_STS);
467 isp1704_charger_set_power(isp, 0);
468 if ((ret & ULPI_INT_VBUS_VALID) && !isp->phy->otg->default_a) {
469 isp->event = USB_EVENT_VBUS;
470 schedule_work(&isp->work);
471 }
472
473 return 0;
474fail2:
475 power_supply_unregister(&isp->psy);
476fail1:
477 isp1704_charger_set_power(isp, 0);
478 usb_put_phy(isp->phy);
479fail0:
480 dev_err(&pdev->dev, "failed to register isp1704 with error %d\n", ret);
481
482 return ret;
483}
484
485static int isp1704_charger_remove(struct platform_device *pdev)
486{
487 struct isp1704_charger *isp = platform_get_drvdata(pdev);
488
489 usb_unregister_notifier(isp->phy, &isp->nb);
490 power_supply_unregister(&isp->psy);
491 usb_put_phy(isp->phy);
492 isp1704_charger_set_power(isp, 0);
493
494 return 0;
495}
496
497static struct platform_driver isp1704_charger_driver = {
498 .driver = {
499 .name = "isp1704_charger",
500 },
501 .probe = isp1704_charger_probe,
502 .remove = isp1704_charger_remove,
503};
504
505module_platform_driver(isp1704_charger_driver);
506
507MODULE_ALIAS("platform:isp1704_charger");
508MODULE_AUTHOR("Nokia Corporation");
509MODULE_DESCRIPTION("ISP170x USB Charger driver");
510MODULE_LICENSE("GPL");
511