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1/*
2 * ISP1704 USB Charger Detection driver
3 *
4 * Copyright (C) 2010 Nokia Corporation
5 * Copyright (C) 2012 - 2013 Pali Rohár <pali.rohar@gmail.com>
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 as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22#include <linux/kernel.h>
23#include <linux/module.h>
24#include <linux/err.h>
25#include <linux/init.h>
26#include <linux/types.h>
27#include <linux/device.h>
28#include <linux/sysfs.h>
29#include <linux/platform_device.h>
30#include <linux/power_supply.h>
31#include <linux/delay.h>
32#include <linux/of.h>
33#include <linux/of_gpio.h>
34
35#include <linux/usb/otg.h>
36#include <linux/usb/ulpi.h>
37#include <linux/usb/ch9.h>
38#include <linux/usb/gadget.h>
39#include <linux/power/isp1704_charger.h>
40
41/* Vendor specific Power Control register */
42#define ISP1704_PWR_CTRL 0x3d
43#define ISP1704_PWR_CTRL_SWCTRL (1 << 0)
44#define ISP1704_PWR_CTRL_DET_COMP (1 << 1)
45#define ISP1704_PWR_CTRL_BVALID_RISE (1 << 2)
46#define ISP1704_PWR_CTRL_BVALID_FALL (1 << 3)
47#define ISP1704_PWR_CTRL_DP_WKPU_EN (1 << 4)
48#define ISP1704_PWR_CTRL_VDAT_DET (1 << 5)
49#define ISP1704_PWR_CTRL_DPVSRC_EN (1 << 6)
50#define ISP1704_PWR_CTRL_HWDETECT (1 << 7)
51
52#define NXP_VENDOR_ID 0x04cc
53
54static u16 isp170x_id[] = {
55 0x1704,
56 0x1707,
57};
58
59struct isp1704_charger {
60 struct device *dev;
61 struct power_supply psy;
62 struct usb_phy *phy;
63 struct notifier_block nb;
64 struct work_struct work;
65
66 /* properties */
67 char model[8];
68 unsigned present:1;
69 unsigned online:1;
70 unsigned current_max;
71};
72
73static inline int isp1704_read(struct isp1704_charger *isp, u32 reg)
74{
75 return usb_phy_io_read(isp->phy, reg);
76}
77
78static inline int isp1704_write(struct isp1704_charger *isp, u32 val, u32 reg)
79{
80 return usb_phy_io_write(isp->phy, val, reg);
81}
82
83/*
84 * Disable/enable the power from the isp1704 if a function for it
85 * has been provided with platform data.
86 */
87static void isp1704_charger_set_power(struct isp1704_charger *isp, bool on)
88{
89 struct isp1704_charger_data *board = isp->dev->platform_data;
90
91 if (board && board->set_power)
92 board->set_power(on);
93 else if (board)
94 gpio_set_value(board->enable_gpio, on);
95}
96
97/*
98 * Determine is the charging port DCP (dedicated charger) or CDP (Host/HUB
99 * chargers).
100 *
101 * REVISIT: The method is defined in Battery Charging Specification and is
102 * applicable to any ULPI transceiver. Nothing isp170x specific here.
103 */
104static inline int isp1704_charger_type(struct isp1704_charger *isp)
105{
106 u8 reg;
107 u8 func_ctrl;
108 u8 otg_ctrl;
109 int type = POWER_SUPPLY_TYPE_USB_DCP;
110
111 func_ctrl = isp1704_read(isp, ULPI_FUNC_CTRL);
112 otg_ctrl = isp1704_read(isp, ULPI_OTG_CTRL);
113
114 /* disable pulldowns */
115 reg = ULPI_OTG_CTRL_DM_PULLDOWN | ULPI_OTG_CTRL_DP_PULLDOWN;
116 isp1704_write(isp, ULPI_CLR(ULPI_OTG_CTRL), reg);
117
118 /* full speed */
119 isp1704_write(isp, ULPI_CLR(ULPI_FUNC_CTRL),
120 ULPI_FUNC_CTRL_XCVRSEL_MASK);
121 isp1704_write(isp, ULPI_SET(ULPI_FUNC_CTRL),
122 ULPI_FUNC_CTRL_FULL_SPEED);
123
124 /* Enable strong pull-up on DP (1.5K) and reset */
125 reg = ULPI_FUNC_CTRL_TERMSELECT | ULPI_FUNC_CTRL_RESET;
126 isp1704_write(isp, ULPI_SET(ULPI_FUNC_CTRL), reg);
127 usleep_range(1000, 2000);
128
129 reg = isp1704_read(isp, ULPI_DEBUG);
130 if ((reg & 3) != 3)
131 type = POWER_SUPPLY_TYPE_USB_CDP;
132
133 /* recover original state */
134 isp1704_write(isp, ULPI_FUNC_CTRL, func_ctrl);
135 isp1704_write(isp, ULPI_OTG_CTRL, otg_ctrl);
136
137 return type;
138}
139
140/*
141 * ISP1704 detects PS/2 adapters as charger. To make sure the detected charger
142 * is actually a dedicated charger, the following steps need to be taken.
143 */
144static inline int isp1704_charger_verify(struct isp1704_charger *isp)
145{
146 int ret = 0;
147 u8 r;
148
149 /* Reset the transceiver */
150 r = isp1704_read(isp, ULPI_FUNC_CTRL);
151 r |= ULPI_FUNC_CTRL_RESET;
152 isp1704_write(isp, ULPI_FUNC_CTRL, r);
153 usleep_range(1000, 2000);
154
155 /* Set normal mode */
156 r &= ~(ULPI_FUNC_CTRL_RESET | ULPI_FUNC_CTRL_OPMODE_MASK);
157 isp1704_write(isp, ULPI_FUNC_CTRL, r);
158
159 /* Clear the DP and DM pull-down bits */
160 r = ULPI_OTG_CTRL_DP_PULLDOWN | ULPI_OTG_CTRL_DM_PULLDOWN;
161 isp1704_write(isp, ULPI_CLR(ULPI_OTG_CTRL), r);
162
163 /* Enable strong pull-up on DP (1.5K) and reset */
164 r = ULPI_FUNC_CTRL_TERMSELECT | ULPI_FUNC_CTRL_RESET;
165 isp1704_write(isp, ULPI_SET(ULPI_FUNC_CTRL), r);
166 usleep_range(1000, 2000);
167
168 /* Read the line state */
169 if (!isp1704_read(isp, ULPI_DEBUG)) {
170 /* Disable strong pull-up on DP (1.5K) */
171 isp1704_write(isp, ULPI_CLR(ULPI_FUNC_CTRL),
172 ULPI_FUNC_CTRL_TERMSELECT);
173 return 1;
174 }
175
176 /* Is it a charger or PS/2 connection */
177
178 /* Enable weak pull-up resistor on DP */
179 isp1704_write(isp, ULPI_SET(ISP1704_PWR_CTRL),
180 ISP1704_PWR_CTRL_DP_WKPU_EN);
181
182 /* Disable strong pull-up on DP (1.5K) */
183 isp1704_write(isp, ULPI_CLR(ULPI_FUNC_CTRL),
184 ULPI_FUNC_CTRL_TERMSELECT);
185
186 /* Enable weak pull-down resistor on DM */
187 isp1704_write(isp, ULPI_SET(ULPI_OTG_CTRL),
188 ULPI_OTG_CTRL_DM_PULLDOWN);
189
190 /* It's a charger if the line states are clear */
191 if (!(isp1704_read(isp, ULPI_DEBUG)))
192 ret = 1;
193
194 /* Disable weak pull-up resistor on DP */
195 isp1704_write(isp, ULPI_CLR(ISP1704_PWR_CTRL),
196 ISP1704_PWR_CTRL_DP_WKPU_EN);
197
198 return ret;
199}
200
201static inline int isp1704_charger_detect(struct isp1704_charger *isp)
202{
203 unsigned long timeout;
204 u8 pwr_ctrl;
205 int ret = 0;
206
207 pwr_ctrl = isp1704_read(isp, ISP1704_PWR_CTRL);
208
209 /* set SW control bit in PWR_CTRL register */
210 isp1704_write(isp, ISP1704_PWR_CTRL,
211 ISP1704_PWR_CTRL_SWCTRL);
212
213 /* enable manual charger detection */
214 isp1704_write(isp, ULPI_SET(ISP1704_PWR_CTRL),
215 ISP1704_PWR_CTRL_SWCTRL
216 | ISP1704_PWR_CTRL_DPVSRC_EN);
217 usleep_range(1000, 2000);
218
219 timeout = jiffies + msecs_to_jiffies(300);
220 do {
221 /* Check if there is a charger */
222 if (isp1704_read(isp, ISP1704_PWR_CTRL)
223 & ISP1704_PWR_CTRL_VDAT_DET) {
224 ret = isp1704_charger_verify(isp);
225 break;
226 }
227 } while (!time_after(jiffies, timeout) && isp->online);
228
229 /* recover original state */
230 isp1704_write(isp, ISP1704_PWR_CTRL, pwr_ctrl);
231
232 return ret;
233}
234
235static inline int isp1704_charger_detect_dcp(struct isp1704_charger *isp)
236{
237 if (isp1704_charger_detect(isp) &&
238 isp1704_charger_type(isp) == POWER_SUPPLY_TYPE_USB_DCP)
239 return true;
240 else
241 return false;
242}
243
244static void isp1704_charger_work(struct work_struct *data)
245{
246 struct isp1704_charger *isp =
247 container_of(data, struct isp1704_charger, work);
248 static DEFINE_MUTEX(lock);
249
250 mutex_lock(&lock);
251
252 switch (isp->phy->last_event) {
253 case USB_EVENT_VBUS:
254 /* do not call wall charger detection more times */
255 if (!isp->present) {
256 isp->online = true;
257 isp->present = 1;
258 isp1704_charger_set_power(isp, 1);
259
260 /* detect wall charger */
261 if (isp1704_charger_detect_dcp(isp)) {
262 isp->psy.type = POWER_SUPPLY_TYPE_USB_DCP;
263 isp->current_max = 1800;
264 } else {
265 isp->psy.type = POWER_SUPPLY_TYPE_USB;
266 isp->current_max = 500;
267 }
268
269 /* enable data pullups */
270 if (isp->phy->otg->gadget)
271 usb_gadget_connect(isp->phy->otg->gadget);
272 }
273
274 if (isp->psy.type != POWER_SUPPLY_TYPE_USB_DCP) {
275 /*
276 * Only 500mA here or high speed chirp
277 * handshaking may break
278 */
279 if (isp->current_max > 500)
280 isp->current_max = 500;
281
282 if (isp->current_max > 100)
283 isp->psy.type = POWER_SUPPLY_TYPE_USB_CDP;
284 }
285 break;
286 case USB_EVENT_NONE:
287 isp->online = false;
288 isp->present = 0;
289 isp->current_max = 0;
290 isp->psy.type = POWER_SUPPLY_TYPE_USB;
291
292 /*
293 * Disable data pullups. We need to prevent the controller from
294 * enumerating.
295 *
296 * FIXME: This is here to allow charger detection with Host/HUB
297 * chargers. The pullups may be enabled elsewhere, so this can
298 * not be the final solution.
299 */
300 if (isp->phy->otg->gadget)
301 usb_gadget_disconnect(isp->phy->otg->gadget);
302
303 isp1704_charger_set_power(isp, 0);
304 break;
305 default:
306 goto out;
307 }
308
309 power_supply_changed(&isp->psy);
310out:
311 mutex_unlock(&lock);
312}
313
314static int isp1704_notifier_call(struct notifier_block *nb,
315 unsigned long val, void *v)
316{
317 struct isp1704_charger *isp =
318 container_of(nb, struct isp1704_charger, nb);
319
320 schedule_work(&isp->work);
321
322 return NOTIFY_OK;
323}
324
325static int isp1704_charger_get_property(struct power_supply *psy,
326 enum power_supply_property psp,
327 union power_supply_propval *val)
328{
329 struct isp1704_charger *isp =
330 container_of(psy, struct isp1704_charger, psy);
331
332 switch (psp) {
333 case POWER_SUPPLY_PROP_PRESENT:
334 val->intval = isp->present;
335 break;
336 case POWER_SUPPLY_PROP_ONLINE:
337 val->intval = isp->online;
338 break;
339 case POWER_SUPPLY_PROP_CURRENT_MAX:
340 val->intval = isp->current_max;
341 break;
342 case POWER_SUPPLY_PROP_MODEL_NAME:
343 val->strval = isp->model;
344 break;
345 case POWER_SUPPLY_PROP_MANUFACTURER:
346 val->strval = "NXP";
347 break;
348 default:
349 return -EINVAL;
350 }
351 return 0;
352}
353
354static enum power_supply_property power_props[] = {
355 POWER_SUPPLY_PROP_PRESENT,
356 POWER_SUPPLY_PROP_ONLINE,
357 POWER_SUPPLY_PROP_CURRENT_MAX,
358 POWER_SUPPLY_PROP_MODEL_NAME,
359 POWER_SUPPLY_PROP_MANUFACTURER,
360};
361
362static inline int isp1704_test_ulpi(struct isp1704_charger *isp)
363{
364 int vendor;
365 int product;
366 int i;
367 int ret = -ENODEV;
368
369 /* Test ULPI interface */
370 ret = isp1704_write(isp, ULPI_SCRATCH, 0xaa);
371 if (ret < 0)
372 return ret;
373
374 ret = isp1704_read(isp, ULPI_SCRATCH);
375 if (ret < 0)
376 return ret;
377
378 if (ret != 0xaa)
379 return -ENODEV;
380
381 /* Verify the product and vendor id matches */
382 vendor = isp1704_read(isp, ULPI_VENDOR_ID_LOW);
383 vendor |= isp1704_read(isp, ULPI_VENDOR_ID_HIGH) << 8;
384 if (vendor != NXP_VENDOR_ID)
385 return -ENODEV;
386
387 product = isp1704_read(isp, ULPI_PRODUCT_ID_LOW);
388 product |= isp1704_read(isp, ULPI_PRODUCT_ID_HIGH) << 8;
389
390 for (i = 0; i < ARRAY_SIZE(isp170x_id); i++) {
391 if (product == isp170x_id[i]) {
392 sprintf(isp->model, "isp%x", product);
393 return product;
394 }
395 }
396
397 dev_err(isp->dev, "product id %x not matching known ids", product);
398
399 return -ENODEV;
400}
401
402static int isp1704_charger_probe(struct platform_device *pdev)
403{
404 struct isp1704_charger *isp;
405 int ret = -ENODEV;
406
407 struct isp1704_charger_data *pdata = dev_get_platdata(&pdev->dev);
408 struct device_node *np = pdev->dev.of_node;
409
410 if (np) {
411 int gpio = of_get_named_gpio(np, "nxp,enable-gpio", 0);
412
413 if (gpio < 0)
414 return gpio;
415
416 pdata = devm_kzalloc(&pdev->dev,
417 sizeof(struct isp1704_charger_data), GFP_KERNEL);
418 pdata->enable_gpio = gpio;
419
420 dev_info(&pdev->dev, "init gpio %d\n", pdata->enable_gpio);
421
422 ret = devm_gpio_request_one(&pdev->dev, pdata->enable_gpio,
423 GPIOF_OUT_INIT_HIGH, "isp1704_reset");
424 if (ret)
425 goto fail0;
426 }
427
428 if (!pdata) {
429 dev_err(&pdev->dev, "missing platform data!\n");
430 return -ENODEV;
431 }
432
433
434 isp = devm_kzalloc(&pdev->dev, sizeof(*isp), GFP_KERNEL);
435 if (!isp)
436 return -ENOMEM;
437
438 if (np)
439 isp->phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0);
440 else
441 isp->phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
442
443 if (IS_ERR(isp->phy)) {
444 ret = PTR_ERR(isp->phy);
445 goto fail0;
446 }
447
448 isp->dev = &pdev->dev;
449 platform_set_drvdata(pdev, isp);
450
451 isp1704_charger_set_power(isp, 1);
452
453 ret = isp1704_test_ulpi(isp);
454 if (ret < 0)
455 goto fail1;
456
457 isp->psy.name = "isp1704";
458 isp->psy.type = POWER_SUPPLY_TYPE_USB;
459 isp->psy.properties = power_props;
460 isp->psy.num_properties = ARRAY_SIZE(power_props);
461 isp->psy.get_property = isp1704_charger_get_property;
462
463 ret = power_supply_register(isp->dev, &isp->psy);
464 if (ret)
465 goto fail1;
466
467 /*
468 * REVISIT: using work in order to allow the usb notifications to be
469 * made atomically in the future.
470 */
471 INIT_WORK(&isp->work, isp1704_charger_work);
472
473 isp->nb.notifier_call = isp1704_notifier_call;
474
475 ret = usb_register_notifier(isp->phy, &isp->nb);
476 if (ret)
477 goto fail2;
478
479 dev_info(isp->dev, "registered with product id %s\n", isp->model);
480
481 /*
482 * Taking over the D+ pullup.
483 *
484 * FIXME: The device will be disconnected if it was already
485 * enumerated. The charger driver should be always loaded before any
486 * gadget is loaded.
487 */
488 if (isp->phy->otg->gadget)
489 usb_gadget_disconnect(isp->phy->otg->gadget);
490
491 if (isp->phy->last_event == USB_EVENT_NONE)
492 isp1704_charger_set_power(isp, 0);
493
494 /* Detect charger if VBUS is valid (the cable was already plugged). */
495 if (isp->phy->last_event == USB_EVENT_VBUS &&
496 !isp->phy->otg->default_a)
497 schedule_work(&isp->work);
498
499 return 0;
500fail2:
501 power_supply_unregister(&isp->psy);
502fail1:
503 isp1704_charger_set_power(isp, 0);
504fail0:
505 dev_err(&pdev->dev, "failed to register isp1704 with error %d\n", ret);
506
507 return ret;
508}
509
510static int isp1704_charger_remove(struct platform_device *pdev)
511{
512 struct isp1704_charger *isp = platform_get_drvdata(pdev);
513
514 usb_unregister_notifier(isp->phy, &isp->nb);
515 power_supply_unregister(&isp->psy);
516 isp1704_charger_set_power(isp, 0);
517
518 return 0;
519}
520
521#ifdef CONFIG_OF
522static const struct of_device_id omap_isp1704_of_match[] = {
523 { .compatible = "nxp,isp1704", },
524 {},
525};
526MODULE_DEVICE_TABLE(of, omap_isp1704_of_match);
527#endif
528
529static struct platform_driver isp1704_charger_driver = {
530 .driver = {
531 .name = "isp1704_charger",
532 .of_match_table = of_match_ptr(omap_isp1704_of_match),
533 },
534 .probe = isp1704_charger_probe,
535 .remove = isp1704_charger_remove,
536};
537
538module_platform_driver(isp1704_charger_driver);
539
540MODULE_ALIAS("platform:isp1704_charger");
541MODULE_AUTHOR("Nokia Corporation");
542MODULE_DESCRIPTION("ISP170x USB Charger driver");
543MODULE_LICENSE("GPL");
1/*
2 * ISP1704 USB Charger Detection driver
3 *
4 * Copyright (C) 2010 Nokia Corporation
5 * Copyright (C) 2012 - 2013 Pali Rohár <pali.rohar@gmail.com>
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 as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22#include <linux/kernel.h>
23#include <linux/module.h>
24#include <linux/err.h>
25#include <linux/init.h>
26#include <linux/types.h>
27#include <linux/device.h>
28#include <linux/sysfs.h>
29#include <linux/platform_device.h>
30#include <linux/power_supply.h>
31#include <linux/delay.h>
32#include <linux/of.h>
33#include <linux/of_gpio.h>
34
35#include <linux/usb/otg.h>
36#include <linux/usb/ulpi.h>
37#include <linux/usb/ch9.h>
38#include <linux/usb/gadget.h>
39#include <linux/power/isp1704_charger.h>
40
41/* Vendor specific Power Control register */
42#define ISP1704_PWR_CTRL 0x3d
43#define ISP1704_PWR_CTRL_SWCTRL (1 << 0)
44#define ISP1704_PWR_CTRL_DET_COMP (1 << 1)
45#define ISP1704_PWR_CTRL_BVALID_RISE (1 << 2)
46#define ISP1704_PWR_CTRL_BVALID_FALL (1 << 3)
47#define ISP1704_PWR_CTRL_DP_WKPU_EN (1 << 4)
48#define ISP1704_PWR_CTRL_VDAT_DET (1 << 5)
49#define ISP1704_PWR_CTRL_DPVSRC_EN (1 << 6)
50#define ISP1704_PWR_CTRL_HWDETECT (1 << 7)
51
52#define NXP_VENDOR_ID 0x04cc
53
54static u16 isp170x_id[] = {
55 0x1704,
56 0x1707,
57};
58
59struct isp1704_charger {
60 struct device *dev;
61 struct power_supply *psy;
62 struct power_supply_desc psy_desc;
63 struct usb_phy *phy;
64 struct notifier_block nb;
65 struct work_struct work;
66
67 /* properties */
68 char model[8];
69 unsigned present:1;
70 unsigned online:1;
71 unsigned current_max;
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 reg, u32 val)
80{
81 return usb_phy_io_write(isp->phy, val, reg);
82}
83
84/*
85 * Disable/enable the power from the isp1704 if a function for it
86 * has been provided with platform data.
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 else if (board)
95 gpio_set_value(board->enable_gpio, on);
96}
97
98/*
99 * Determine is the charging port DCP (dedicated charger) or CDP (Host/HUB
100 * chargers).
101 *
102 * REVISIT: The method is defined in Battery Charging Specification and is
103 * applicable to any ULPI transceiver. Nothing isp170x specific here.
104 */
105static inline int isp1704_charger_type(struct isp1704_charger *isp)
106{
107 u8 reg;
108 u8 func_ctrl;
109 u8 otg_ctrl;
110 int type = POWER_SUPPLY_TYPE_USB_DCP;
111
112 func_ctrl = isp1704_read(isp, ULPI_FUNC_CTRL);
113 otg_ctrl = isp1704_read(isp, ULPI_OTG_CTRL);
114
115 /* disable pulldowns */
116 reg = ULPI_OTG_CTRL_DM_PULLDOWN | ULPI_OTG_CTRL_DP_PULLDOWN;
117 isp1704_write(isp, ULPI_CLR(ULPI_OTG_CTRL), reg);
118
119 /* full speed */
120 isp1704_write(isp, ULPI_CLR(ULPI_FUNC_CTRL),
121 ULPI_FUNC_CTRL_XCVRSEL_MASK);
122 isp1704_write(isp, ULPI_SET(ULPI_FUNC_CTRL),
123 ULPI_FUNC_CTRL_FULL_SPEED);
124
125 /* Enable strong pull-up on DP (1.5K) and reset */
126 reg = ULPI_FUNC_CTRL_TERMSELECT | ULPI_FUNC_CTRL_RESET;
127 isp1704_write(isp, ULPI_SET(ULPI_FUNC_CTRL), reg);
128 usleep_range(1000, 2000);
129
130 reg = isp1704_read(isp, ULPI_DEBUG);
131 if ((reg & 3) != 3)
132 type = POWER_SUPPLY_TYPE_USB_CDP;
133
134 /* recover original state */
135 isp1704_write(isp, ULPI_FUNC_CTRL, func_ctrl);
136 isp1704_write(isp, ULPI_OTG_CTRL, otg_ctrl);
137
138 return type;
139}
140
141/*
142 * ISP1704 detects PS/2 adapters as charger. To make sure the detected charger
143 * is actually a dedicated charger, the following steps need to be taken.
144 */
145static inline int isp1704_charger_verify(struct isp1704_charger *isp)
146{
147 int ret = 0;
148 u8 r;
149
150 /* Reset the transceiver */
151 r = isp1704_read(isp, ULPI_FUNC_CTRL);
152 r |= ULPI_FUNC_CTRL_RESET;
153 isp1704_write(isp, ULPI_FUNC_CTRL, r);
154 usleep_range(1000, 2000);
155
156 /* Set normal mode */
157 r &= ~(ULPI_FUNC_CTRL_RESET | ULPI_FUNC_CTRL_OPMODE_MASK);
158 isp1704_write(isp, ULPI_FUNC_CTRL, r);
159
160 /* Clear the DP and DM pull-down bits */
161 r = ULPI_OTG_CTRL_DP_PULLDOWN | ULPI_OTG_CTRL_DM_PULLDOWN;
162 isp1704_write(isp, ULPI_CLR(ULPI_OTG_CTRL), r);
163
164 /* Enable strong pull-up on DP (1.5K) and reset */
165 r = ULPI_FUNC_CTRL_TERMSELECT | ULPI_FUNC_CTRL_RESET;
166 isp1704_write(isp, ULPI_SET(ULPI_FUNC_CTRL), r);
167 usleep_range(1000, 2000);
168
169 /* Read the line state */
170 if (!isp1704_read(isp, ULPI_DEBUG)) {
171 /* Disable strong pull-up on DP (1.5K) */
172 isp1704_write(isp, ULPI_CLR(ULPI_FUNC_CTRL),
173 ULPI_FUNC_CTRL_TERMSELECT);
174 return 1;
175 }
176
177 /* Is it a charger or PS/2 connection */
178
179 /* Enable weak pull-up resistor on DP */
180 isp1704_write(isp, ULPI_SET(ISP1704_PWR_CTRL),
181 ISP1704_PWR_CTRL_DP_WKPU_EN);
182
183 /* Disable strong pull-up on DP (1.5K) */
184 isp1704_write(isp, ULPI_CLR(ULPI_FUNC_CTRL),
185 ULPI_FUNC_CTRL_TERMSELECT);
186
187 /* Enable weak pull-down resistor on DM */
188 isp1704_write(isp, ULPI_SET(ULPI_OTG_CTRL),
189 ULPI_OTG_CTRL_DM_PULLDOWN);
190
191 /* It's a charger if the line states are clear */
192 if (!(isp1704_read(isp, ULPI_DEBUG)))
193 ret = 1;
194
195 /* Disable weak pull-up resistor on DP */
196 isp1704_write(isp, ULPI_CLR(ISP1704_PWR_CTRL),
197 ISP1704_PWR_CTRL_DP_WKPU_EN);
198
199 return ret;
200}
201
202static inline int isp1704_charger_detect(struct isp1704_charger *isp)
203{
204 unsigned long timeout;
205 u8 pwr_ctrl;
206 int ret = 0;
207
208 pwr_ctrl = isp1704_read(isp, ISP1704_PWR_CTRL);
209
210 /* set SW control bit in PWR_CTRL register */
211 isp1704_write(isp, ISP1704_PWR_CTRL,
212 ISP1704_PWR_CTRL_SWCTRL);
213
214 /* enable manual charger detection */
215 isp1704_write(isp, ULPI_SET(ISP1704_PWR_CTRL),
216 ISP1704_PWR_CTRL_SWCTRL
217 | ISP1704_PWR_CTRL_DPVSRC_EN);
218 usleep_range(1000, 2000);
219
220 timeout = jiffies + msecs_to_jiffies(300);
221 do {
222 /* Check if there is a charger */
223 if (isp1704_read(isp, ISP1704_PWR_CTRL)
224 & ISP1704_PWR_CTRL_VDAT_DET) {
225 ret = isp1704_charger_verify(isp);
226 break;
227 }
228 } while (!time_after(jiffies, timeout) && isp->online);
229
230 /* recover original state */
231 isp1704_write(isp, ISP1704_PWR_CTRL, pwr_ctrl);
232
233 return ret;
234}
235
236static inline int isp1704_charger_detect_dcp(struct isp1704_charger *isp)
237{
238 if (isp1704_charger_detect(isp) &&
239 isp1704_charger_type(isp) == POWER_SUPPLY_TYPE_USB_DCP)
240 return true;
241 else
242 return false;
243}
244
245static void isp1704_charger_work(struct work_struct *data)
246{
247 struct isp1704_charger *isp =
248 container_of(data, struct isp1704_charger, work);
249 static DEFINE_MUTEX(lock);
250
251 mutex_lock(&lock);
252
253 switch (isp->phy->last_event) {
254 case USB_EVENT_VBUS:
255 /* do not call wall charger detection more times */
256 if (!isp->present) {
257 isp->online = true;
258 isp->present = 1;
259 isp1704_charger_set_power(isp, 1);
260
261 /* detect wall charger */
262 if (isp1704_charger_detect_dcp(isp)) {
263 isp->psy_desc.type = POWER_SUPPLY_TYPE_USB_DCP;
264 isp->current_max = 1800;
265 } else {
266 isp->psy_desc.type = POWER_SUPPLY_TYPE_USB;
267 isp->current_max = 500;
268 }
269
270 /* enable data pullups */
271 if (isp->phy->otg->gadget)
272 usb_gadget_connect(isp->phy->otg->gadget);
273 }
274
275 if (isp->psy_desc.type != POWER_SUPPLY_TYPE_USB_DCP) {
276 /*
277 * Only 500mA here or high speed chirp
278 * handshaking may break
279 */
280 if (isp->current_max > 500)
281 isp->current_max = 500;
282
283 if (isp->current_max > 100)
284 isp->psy_desc.type = POWER_SUPPLY_TYPE_USB_CDP;
285 }
286 break;
287 case USB_EVENT_NONE:
288 isp->online = false;
289 isp->present = 0;
290 isp->current_max = 0;
291 isp->psy_desc.type = POWER_SUPPLY_TYPE_USB;
292
293 /*
294 * Disable data pullups. We need to prevent the controller from
295 * enumerating.
296 *
297 * FIXME: This is here to allow charger detection with Host/HUB
298 * chargers. The pullups may be enabled elsewhere, so this can
299 * not be the final solution.
300 */
301 if (isp->phy->otg->gadget)
302 usb_gadget_disconnect(isp->phy->otg->gadget);
303
304 isp1704_charger_set_power(isp, 0);
305 break;
306 default:
307 goto out;
308 }
309
310 power_supply_changed(isp->psy);
311out:
312 mutex_unlock(&lock);
313}
314
315static int isp1704_notifier_call(struct notifier_block *nb,
316 unsigned long val, void *v)
317{
318 struct isp1704_charger *isp =
319 container_of(nb, struct isp1704_charger, nb);
320
321 schedule_work(&isp->work);
322
323 return NOTIFY_OK;
324}
325
326static int isp1704_charger_get_property(struct power_supply *psy,
327 enum power_supply_property psp,
328 union power_supply_propval *val)
329{
330 struct isp1704_charger *isp = power_supply_get_drvdata(psy);
331
332 switch (psp) {
333 case POWER_SUPPLY_PROP_PRESENT:
334 val->intval = isp->present;
335 break;
336 case POWER_SUPPLY_PROP_ONLINE:
337 val->intval = isp->online;
338 break;
339 case POWER_SUPPLY_PROP_CURRENT_MAX:
340 val->intval = isp->current_max;
341 break;
342 case POWER_SUPPLY_PROP_MODEL_NAME:
343 val->strval = isp->model;
344 break;
345 case POWER_SUPPLY_PROP_MANUFACTURER:
346 val->strval = "NXP";
347 break;
348 default:
349 return -EINVAL;
350 }
351 return 0;
352}
353
354static enum power_supply_property power_props[] = {
355 POWER_SUPPLY_PROP_PRESENT,
356 POWER_SUPPLY_PROP_ONLINE,
357 POWER_SUPPLY_PROP_CURRENT_MAX,
358 POWER_SUPPLY_PROP_MODEL_NAME,
359 POWER_SUPPLY_PROP_MANUFACTURER,
360};
361
362static inline int isp1704_test_ulpi(struct isp1704_charger *isp)
363{
364 int vendor;
365 int product;
366 int i;
367 int ret = -ENODEV;
368
369 /* Test ULPI interface */
370 ret = isp1704_write(isp, ULPI_SCRATCH, 0xaa);
371 if (ret < 0)
372 return ret;
373
374 ret = isp1704_read(isp, ULPI_SCRATCH);
375 if (ret < 0)
376 return ret;
377
378 if (ret != 0xaa)
379 return -ENODEV;
380
381 /* Verify the product and vendor id matches */
382 vendor = isp1704_read(isp, ULPI_VENDOR_ID_LOW);
383 vendor |= isp1704_read(isp, ULPI_VENDOR_ID_HIGH) << 8;
384 if (vendor != NXP_VENDOR_ID)
385 return -ENODEV;
386
387 product = isp1704_read(isp, ULPI_PRODUCT_ID_LOW);
388 product |= isp1704_read(isp, ULPI_PRODUCT_ID_HIGH) << 8;
389
390 for (i = 0; i < ARRAY_SIZE(isp170x_id); i++) {
391 if (product == isp170x_id[i]) {
392 sprintf(isp->model, "isp%x", product);
393 return product;
394 }
395 }
396
397 dev_err(isp->dev, "product id %x not matching known ids", product);
398
399 return -ENODEV;
400}
401
402static int isp1704_charger_probe(struct platform_device *pdev)
403{
404 struct isp1704_charger *isp;
405 int ret = -ENODEV;
406 struct power_supply_config psy_cfg = {};
407
408 struct isp1704_charger_data *pdata = dev_get_platdata(&pdev->dev);
409 struct device_node *np = pdev->dev.of_node;
410
411 if (np) {
412 int gpio = of_get_named_gpio(np, "nxp,enable-gpio", 0);
413
414 if (gpio < 0) {
415 dev_err(&pdev->dev, "missing DT GPIO nxp,enable-gpio\n");
416 return gpio;
417 }
418
419 pdata = devm_kzalloc(&pdev->dev,
420 sizeof(struct isp1704_charger_data), GFP_KERNEL);
421 pdata->enable_gpio = gpio;
422
423 dev_info(&pdev->dev, "init gpio %d\n", pdata->enable_gpio);
424
425 ret = devm_gpio_request_one(&pdev->dev, pdata->enable_gpio,
426 GPIOF_OUT_INIT_HIGH, "isp1704_reset");
427 if (ret) {
428 dev_err(&pdev->dev, "gpio request failed\n");
429 goto fail0;
430 }
431 }
432
433 if (!pdata) {
434 dev_err(&pdev->dev, "missing platform data!\n");
435 return -ENODEV;
436 }
437
438
439 isp = devm_kzalloc(&pdev->dev, sizeof(*isp), GFP_KERNEL);
440 if (!isp)
441 return -ENOMEM;
442
443 if (np)
444 isp->phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0);
445 else
446 isp->phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
447
448 if (IS_ERR(isp->phy)) {
449 ret = PTR_ERR(isp->phy);
450 dev_err(&pdev->dev, "usb_get_phy failed\n");
451 goto fail0;
452 }
453
454 isp->dev = &pdev->dev;
455 platform_set_drvdata(pdev, isp);
456
457 isp1704_charger_set_power(isp, 1);
458
459 ret = isp1704_test_ulpi(isp);
460 if (ret < 0) {
461 dev_err(&pdev->dev, "isp1704_test_ulpi failed\n");
462 goto fail1;
463 }
464
465 isp->psy_desc.name = "isp1704";
466 isp->psy_desc.type = POWER_SUPPLY_TYPE_USB;
467 isp->psy_desc.properties = power_props;
468 isp->psy_desc.num_properties = ARRAY_SIZE(power_props);
469 isp->psy_desc.get_property = isp1704_charger_get_property;
470
471 psy_cfg.drv_data = isp;
472
473 isp->psy = power_supply_register(isp->dev, &isp->psy_desc, &psy_cfg);
474 if (IS_ERR(isp->psy)) {
475 ret = PTR_ERR(isp->psy);
476 dev_err(&pdev->dev, "power_supply_register failed\n");
477 goto fail1;
478 }
479
480 /*
481 * REVISIT: using work in order to allow the usb notifications to be
482 * made atomically in the future.
483 */
484 INIT_WORK(&isp->work, isp1704_charger_work);
485
486 isp->nb.notifier_call = isp1704_notifier_call;
487
488 ret = usb_register_notifier(isp->phy, &isp->nb);
489 if (ret) {
490 dev_err(&pdev->dev, "usb_register_notifier failed\n");
491 goto fail2;
492 }
493
494 dev_info(isp->dev, "registered with product id %s\n", isp->model);
495
496 /*
497 * Taking over the D+ pullup.
498 *
499 * FIXME: The device will be disconnected if it was already
500 * enumerated. The charger driver should be always loaded before any
501 * gadget is loaded.
502 */
503 if (isp->phy->otg->gadget)
504 usb_gadget_disconnect(isp->phy->otg->gadget);
505
506 if (isp->phy->last_event == USB_EVENT_NONE)
507 isp1704_charger_set_power(isp, 0);
508
509 /* Detect charger if VBUS is valid (the cable was already plugged). */
510 if (isp->phy->last_event == USB_EVENT_VBUS &&
511 !isp->phy->otg->default_a)
512 schedule_work(&isp->work);
513
514 return 0;
515fail2:
516 power_supply_unregister(isp->psy);
517fail1:
518 isp1704_charger_set_power(isp, 0);
519fail0:
520 dev_err(&pdev->dev, "failed to register isp1704 with error %d\n", ret);
521
522 return ret;
523}
524
525static int isp1704_charger_remove(struct platform_device *pdev)
526{
527 struct isp1704_charger *isp = platform_get_drvdata(pdev);
528
529 usb_unregister_notifier(isp->phy, &isp->nb);
530 power_supply_unregister(isp->psy);
531 isp1704_charger_set_power(isp, 0);
532
533 return 0;
534}
535
536#ifdef CONFIG_OF
537static const struct of_device_id omap_isp1704_of_match[] = {
538 { .compatible = "nxp,isp1704", },
539 { .compatible = "nxp,isp1707", },
540 {},
541};
542MODULE_DEVICE_TABLE(of, omap_isp1704_of_match);
543#endif
544
545static struct platform_driver isp1704_charger_driver = {
546 .driver = {
547 .name = "isp1704_charger",
548 .of_match_table = of_match_ptr(omap_isp1704_of_match),
549 },
550 .probe = isp1704_charger_probe,
551 .remove = isp1704_charger_remove,
552};
553
554module_platform_driver(isp1704_charger_driver);
555
556MODULE_ALIAS("platform:isp1704_charger");
557MODULE_AUTHOR("Nokia Corporation");
558MODULE_DESCRIPTION("ISP170x USB Charger driver");
559MODULE_LICENSE("GPL");