blob: fc04d191579bd987ba0ad94ddd6b298c329c2b18 [file] [log] [blame]
Heikki Krogerusec464752010-08-19 15:09:36 +03001/*
2 * ISP1704 USB Charger Detection driver
3 *
4 * Copyright (C) 2010 Nokia Corporation
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 as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
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>
Kalle Jokiniemi2785cef2011-03-29 16:27:59 +030036#include <linux/power/isp1704_charger.h>
Heikki Krogerusec464752010-08-19 15:09:36 +030037
38/* Vendor specific Power Control register */
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;
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +020059 struct usb_phy *phy;
Heikki Krogerusec464752010-08-19 15:09:36 +030060 struct notifier_block nb;
61 struct work_struct work;
62
Heikki Krogerusbac43b22010-11-04 16:31:47 +020063 /* properties */
Ameya Palande746d8fb2010-11-04 16:31:46 +020064 char model[8];
Heikki Krogerusec464752010-08-19 15:09:36 +030065 unsigned present:1;
Heikki Krogerusbac43b22010-11-04 16:31:47 +020066 unsigned online:1;
67 unsigned current_max;
68
69 /* temp storage variables */
70 unsigned long event;
71 unsigned max_power;
Heikki Krogerusec464752010-08-19 15:09:36 +030072};
73
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +020074static 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
Heikki Krogerusec464752010-08-19 15:09:36 +030084/*
Kalle Jokiniemi2785cef2011-03-29 16:27:59 +030085 * 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
Felipe Contrerasc9345022012-01-06 06:00:48 +040092 if (board && board->set_power)
Kalle Jokiniemi2785cef2011-03-29 16:27:59 +030093 board->set_power(on);
94}
95
96/*
Heikki Krogerusbac43b22010-11-04 16:31:47 +020097 * Determine is the charging port DCP (dedicated charger) or CDP (Host/HUB
98 * chargers).
99 *
100 * REVISIT: The method is defined in Battery Charging Specification and is
101 * applicable to any ULPI transceiver. Nothing isp170x specific here.
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
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200110 func_ctrl = isp1704_read(isp, ULPI_FUNC_CTRL);
111 otg_ctrl = isp1704_read(isp, ULPI_OTG_CTRL);
Heikki Krogerusbac43b22010-11-04 16:31:47 +0200112
113 /* disable pulldowns */
114 reg = ULPI_OTG_CTRL_DM_PULLDOWN | ULPI_OTG_CTRL_DP_PULLDOWN;
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200115 isp1704_write(isp, ULPI_CLR(ULPI_OTG_CTRL), reg);
Heikki Krogerusbac43b22010-11-04 16:31:47 +0200116
117 /* full speed */
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200118 isp1704_write(isp, ULPI_CLR(ULPI_FUNC_CTRL),
Heikki Krogerusbac43b22010-11-04 16:31:47 +0200119 ULPI_FUNC_CTRL_XCVRSEL_MASK);
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200120 isp1704_write(isp, ULPI_SET(ULPI_FUNC_CTRL),
Heikki Krogerusbac43b22010-11-04 16:31:47 +0200121 ULPI_FUNC_CTRL_FULL_SPEED);
122
123 /* Enable strong pull-up on DP (1.5K) and reset */
124 reg = ULPI_FUNC_CTRL_TERMSELECT | ULPI_FUNC_CTRL_RESET;
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200125 isp1704_write(isp, ULPI_SET(ULPI_FUNC_CTRL), reg);
Heikki Krogerusbac43b22010-11-04 16:31:47 +0200126 usleep_range(1000, 2000);
127
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200128 reg = isp1704_read(isp, ULPI_DEBUG);
Heikki Krogerusbac43b22010-11-04 16:31:47 +0200129 if ((reg & 3) != 3)
130 type = POWER_SUPPLY_TYPE_USB_CDP;
131
132 /* recover original state */
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200133 isp1704_write(isp, ULPI_FUNC_CTRL, func_ctrl);
134 isp1704_write(isp, ULPI_OTG_CTRL, otg_ctrl);
Heikki Krogerusbac43b22010-11-04 16:31:47 +0200135
136 return type;
137}
138
139/*
Heikki Krogerusec464752010-08-19 15:09:36 +0300140 * ISP1704 detects PS/2 adapters as charger. To make sure the detected charger
141 * is actually a dedicated charger, the following steps need to be taken.
142 */
143static inline int isp1704_charger_verify(struct isp1704_charger *isp)
144{
145 int ret = 0;
146 u8 r;
147
148 /* Reset the transceiver */
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200149 r = isp1704_read(isp, ULPI_FUNC_CTRL);
Heikki Krogerusec464752010-08-19 15:09:36 +0300150 r |= ULPI_FUNC_CTRL_RESET;
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200151 isp1704_write(isp, ULPI_FUNC_CTRL, r);
Heikki Krogerusec464752010-08-19 15:09:36 +0300152 usleep_range(1000, 2000);
153
154 /* Set normal mode */
155 r &= ~(ULPI_FUNC_CTRL_RESET | ULPI_FUNC_CTRL_OPMODE_MASK);
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200156 isp1704_write(isp, ULPI_FUNC_CTRL, r);
Heikki Krogerusec464752010-08-19 15:09:36 +0300157
158 /* Clear the DP and DM pull-down bits */
159 r = ULPI_OTG_CTRL_DP_PULLDOWN | ULPI_OTG_CTRL_DM_PULLDOWN;
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200160 isp1704_write(isp, ULPI_CLR(ULPI_OTG_CTRL), r);
Heikki Krogerusec464752010-08-19 15:09:36 +0300161
162 /* Enable strong pull-up on DP (1.5K) and reset */
163 r = ULPI_FUNC_CTRL_TERMSELECT | ULPI_FUNC_CTRL_RESET;
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200164 isp1704_write(isp, ULPI_SET(ULPI_FUNC_CTRL), r);
Heikki Krogerusec464752010-08-19 15:09:36 +0300165 usleep_range(1000, 2000);
166
167 /* Read the line state */
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200168 if (!isp1704_read(isp, ULPI_DEBUG)) {
Heikki Krogerusec464752010-08-19 15:09:36 +0300169 /* Disable strong pull-up on DP (1.5K) */
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200170 isp1704_write(isp, ULPI_CLR(ULPI_FUNC_CTRL),
Heikki Krogerusec464752010-08-19 15:09:36 +0300171 ULPI_FUNC_CTRL_TERMSELECT);
172 return 1;
173 }
174
175 /* Is it a charger or PS/2 connection */
176
177 /* Enable weak pull-up resistor on DP */
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200178 isp1704_write(isp, ULPI_SET(ISP1704_PWR_CTRL),
Heikki Krogerusec464752010-08-19 15:09:36 +0300179 ISP1704_PWR_CTRL_DP_WKPU_EN);
180
181 /* Disable strong pull-up on DP (1.5K) */
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200182 isp1704_write(isp, ULPI_CLR(ULPI_FUNC_CTRL),
Heikki Krogerusec464752010-08-19 15:09:36 +0300183 ULPI_FUNC_CTRL_TERMSELECT);
184
185 /* Enable weak pull-down resistor on DM */
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200186 isp1704_write(isp, ULPI_SET(ULPI_OTG_CTRL),
Heikki Krogerusec464752010-08-19 15:09:36 +0300187 ULPI_OTG_CTRL_DM_PULLDOWN);
188
189 /* It's a charger if the line states are clear */
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200190 if (!(isp1704_read(isp, ULPI_DEBUG)))
Heikki Krogerusec464752010-08-19 15:09:36 +0300191 ret = 1;
192
193 /* Disable weak pull-up resistor on DP */
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200194 isp1704_write(isp, ULPI_CLR(ISP1704_PWR_CTRL),
Heikki Krogerusec464752010-08-19 15:09:36 +0300195 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;
Heikki Krogerusbac43b22010-11-04 16:31:47 +0200203 u8 pwr_ctrl;
Heikki Krogerusec464752010-08-19 15:09:36 +0300204 int ret = 0;
205
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200206 pwr_ctrl = isp1704_read(isp, ISP1704_PWR_CTRL);
Heikki Krogerusbac43b22010-11-04 16:31:47 +0200207
Heikki Krogerusec464752010-08-19 15:09:36 +0300208 /* set SW control bit in PWR_CTRL register */
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200209 isp1704_write(isp, ISP1704_PWR_CTRL,
Heikki Krogerusec464752010-08-19 15:09:36 +0300210 ISP1704_PWR_CTRL_SWCTRL);
211
212 /* enable manual charger detection */
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200213 isp1704_write(isp, ULPI_SET(ISP1704_PWR_CTRL),
Heikki Krogerusbac43b22010-11-04 16:31:47 +0200214 ISP1704_PWR_CTRL_SWCTRL
215 | ISP1704_PWR_CTRL_DPVSRC_EN);
Heikki Krogerusec464752010-08-19 15:09:36 +0300216 usleep_range(1000, 2000);
217
218 timeout = jiffies + msecs_to_jiffies(300);
219 do {
220 /* Check if there is a charger */
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200221 if (isp1704_read(isp, ISP1704_PWR_CTRL)
Heikki Krogerusec464752010-08-19 15:09:36 +0300222 & ISP1704_PWR_CTRL_VDAT_DET) {
223 ret = isp1704_charger_verify(isp);
224 break;
225 }
Heikki Krogerusbac43b22010-11-04 16:31:47 +0200226 } while (!time_after(jiffies, timeout) && isp->online);
227
228 /* recover original state */
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200229 isp1704_write(isp, ISP1704_PWR_CTRL, pwr_ctrl);
Heikki Krogerusec464752010-08-19 15:09:36 +0300230
231 return ret;
232}
233
234static void isp1704_charger_work(struct work_struct *data)
235{
236 int detect;
Heikki Krogerusbac43b22010-11-04 16:31:47 +0200237 unsigned long event;
238 unsigned power;
Heikki Krogerusec464752010-08-19 15:09:36 +0300239 struct isp1704_charger *isp =
240 container_of(data, struct isp1704_charger, work);
Heikki Krogerusbac43b22010-11-04 16:31:47 +0200241 static DEFINE_MUTEX(lock);
Heikki Krogerusec464752010-08-19 15:09:36 +0300242
Heikki Krogerusbac43b22010-11-04 16:31:47 +0200243 event = isp->event;
244 power = isp->max_power;
Heikki Krogerusec464752010-08-19 15:09:36 +0300245
Heikki Krogerusbac43b22010-11-04 16:31:47 +0200246 mutex_lock(&lock);
Heikki Krogerusec464752010-08-19 15:09:36 +0300247
Kalle Jokiniemi2785cef2011-03-29 16:27:59 +0300248 if (event != USB_EVENT_NONE)
249 isp1704_charger_set_power(isp, 1);
250
Heikki Krogerusbac43b22010-11-04 16:31:47 +0200251 switch (event) {
252 case USB_EVENT_VBUS:
253 isp->online = true;
254
255 /* detect charger */
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 * Only 500mA here or high speed chirp
270 * handshaking may break
271 */
272 isp->current_max = 500;
273 /* FALLTHROUGH */
274 case POWER_SUPPLY_TYPE_USB:
275 default:
276 /* enable data pullups */
Heikki Krogerusb1c711d2012-02-13 13:24:17 +0200277 if (isp->phy->otg->gadget)
278 usb_gadget_connect(isp->phy->otg->gadget);
Heikki Krogerusbac43b22010-11-04 16:31:47 +0200279 }
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 * Disable data pullups. We need to prevent the controller from
290 * enumerating.
291 *
292 * FIXME: This is here to allow charger detection with Host/HUB
293 * chargers. The pullups may be enabled elsewhere, so this can
294 * not be the final solution.
295 */
Heikki Krogerusb1c711d2012-02-13 13:24:17 +0200296 if (isp->phy->otg->gadget)
297 usb_gadget_disconnect(isp->phy->otg->gadget);
Kalle Jokiniemi2785cef2011-03-29 16:27:59 +0300298
299 isp1704_charger_set_power(isp, 0);
Heikki Krogerusbac43b22010-11-04 16:31:47 +0200300 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;
Heikki Krogerusec464752010-08-19 15:09:36 +0300309 }
310
Heikki Krogerusbac43b22010-11-04 16:31:47 +0200311 power_supply_changed(&isp->psy);
312out:
313 mutex_unlock(&lock);
Heikki Krogerusec464752010-08-19 15:09:36 +0300314}
315
316static int isp1704_notifier_call(struct notifier_block *nb,
Heikki Krogerusbac43b22010-11-04 16:31:47 +0200317 unsigned long event, void *power)
Heikki Krogerusec464752010-08-19 15:09:36 +0300318{
319 struct isp1704_charger *isp =
320 container_of(nb, struct isp1704_charger, nb);
321
Heikki Krogerusbac43b22010-11-04 16:31:47 +0200322 isp->event = event;
323
324 if (power)
325 isp->max_power = *((unsigned *)power);
326
327 schedule_work(&isp->work);
Heikki Krogerusec464752010-08-19 15:09:36 +0300328
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;
Heikki Krogerusbac43b22010-11-04 16:31:47 +0200343 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;
Heikki Krogerusec464752010-08-19 15:09:36 +0300349 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,
Heikki Krogerusbac43b22010-11-04 16:31:47 +0200363 POWER_SUPPLY_PROP_ONLINE,
364 POWER_SUPPLY_PROP_CURRENT_MAX,
Heikki Krogerusec464752010-08-19 15:09:36 +0300365 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 /* Test ULPI interface */
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200377 ret = isp1704_write(isp, ULPI_SCRATCH, 0xaa);
Heikki Krogerusec464752010-08-19 15:09:36 +0300378 if (ret < 0)
379 return ret;
380
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200381 ret = isp1704_read(isp, ULPI_SCRATCH);
Heikki Krogerusec464752010-08-19 15:09:36 +0300382 if (ret < 0)
383 return ret;
384
385 if (ret != 0xaa)
386 return -ENODEV;
387
388 /* Verify the product and vendor id matches */
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200389 vendor = isp1704_read(isp, ULPI_VENDOR_ID_LOW);
390 vendor |= isp1704_read(isp, ULPI_VENDOR_ID_HIGH) << 8;
Heikki Krogerusec464752010-08-19 15:09:36 +0300391 if (vendor != NXP_VENDOR_ID)
392 return -ENODEV;
393
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200394 product = isp1704_read(isp, ULPI_PRODUCT_ID_LOW);
395 product |= isp1704_read(isp, ULPI_PRODUCT_ID_HIGH) << 8;
Heikki Krogerusec464752010-08-19 15:09:36 +0300396
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
Bill Pembertonc8afa642012-11-19 13:22:23 -0500409static int isp1704_charger_probe(struct platform_device *pdev)
Heikki Krogerusec464752010-08-19 15:09:36 +0300410{
411 struct isp1704_charger *isp;
412 int ret = -ENODEV;
413
Jingoo Han2a2ce522013-03-11 15:34:15 +0900414 isp = devm_kzalloc(&pdev->dev, sizeof(*isp), GFP_KERNEL);
Heikki Krogerusec464752010-08-19 15:09:36 +0300415 if (!isp)
416 return -ENOMEM;
417
Kishon Vijay Abraham I662dca52012-06-22 17:02:46 +0530418 isp->phy = usb_get_phy(USB_PHY_TYPE_USB2);
Kishon Vijay Abraham Ided017e2012-06-26 17:40:32 +0530419 if (IS_ERR_OR_NULL(isp->phy))
Heikki Krogerusec464752010-08-19 15:09:36 +0300420 goto fail0;
421
Heikki Krogerusa4607d92010-11-04 16:31:48 +0200422 isp->dev = &pdev->dev;
423 platform_set_drvdata(pdev, isp);
424
Kalle Jokiniemi2785cef2011-03-29 16:27:59 +0300425 isp1704_charger_set_power(isp, 1);
426
Heikki Krogerusec464752010-08-19 15:09:36 +0300427 ret = isp1704_test_ulpi(isp);
428 if (ret < 0)
429 goto fail1;
430
Heikki Krogerusec464752010-08-19 15:09:36 +0300431 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 /*
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200442 * REVISIT: using work in order to allow the usb notifications to be
Heikki Krogerusec464752010-08-19 15:09:36 +0300443 * made atomically in the future.
444 */
445 INIT_WORK(&isp->work, isp1704_charger_work);
446
447 isp->nb.notifier_call = isp1704_notifier_call;
448
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200449 ret = usb_register_notifier(isp->phy, &isp->nb);
Heikki Krogerusec464752010-08-19 15:09:36 +0300450 if (ret)
451 goto fail2;
452
453 dev_info(isp->dev, "registered with product id %s\n", isp->model);
454
Heikki Krogeruse1a85694e2010-11-08 12:22:40 +0200455 /*
456 * Taking over the D+ pullup.
457 *
458 * FIXME: The device will be disconnected if it was already
459 * enumerated. The charger driver should be always loaded before any
460 * gadget is loaded.
461 */
Heikki Krogerusb1c711d2012-02-13 13:24:17 +0200462 if (isp->phy->otg->gadget)
463 usb_gadget_disconnect(isp->phy->otg->gadget);
Heikki Krogeruse1a85694e2010-11-08 12:22:40 +0200464
465 /* Detect charger if VBUS is valid (the cable was already plugged). */
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200466 ret = isp1704_read(isp, ULPI_USB_INT_STS);
Kalle Jokiniemi2785cef2011-03-29 16:27:59 +0300467 isp1704_charger_set_power(isp, 0);
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200468 if ((ret & ULPI_INT_VBUS_VALID) && !isp->phy->otg->default_a) {
Heikki Krogeruse1a85694e2010-11-08 12:22:40 +0200469 isp->event = USB_EVENT_VBUS;
470 schedule_work(&isp->work);
471 }
472
Heikki Krogerusec464752010-08-19 15:09:36 +0300473 return 0;
474fail2:
475 power_supply_unregister(&isp->psy);
476fail1:
Dan Carpenter81a08382012-03-27 23:22:13 +0300477 isp1704_charger_set_power(isp, 0);
Kishon Vijay Abraham I721002e2012-06-22 17:02:45 +0530478 usb_put_phy(isp->phy);
Heikki Krogerusec464752010-08-19 15:09:36 +0300479fail0:
Heikki Krogerusec464752010-08-19 15:09:36 +0300480 dev_err(&pdev->dev, "failed to register isp1704 with error %d\n", ret);
481
482 return ret;
483}
484
Bill Pemberton415ec692012-11-19 13:26:07 -0500485static int isp1704_charger_remove(struct platform_device *pdev)
Heikki Krogerusec464752010-08-19 15:09:36 +0300486{
487 struct isp1704_charger *isp = platform_get_drvdata(pdev);
488
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200489 usb_unregister_notifier(isp->phy, &isp->nb);
Heikki Krogerusec464752010-08-19 15:09:36 +0300490 power_supply_unregister(&isp->psy);
Kishon Vijay Abraham I721002e2012-06-22 17:02:45 +0530491 usb_put_phy(isp->phy);
Kalle Jokiniemi2785cef2011-03-29 16:27:59 +0300492 isp1704_charger_set_power(isp, 0);
Heikki Krogerusec464752010-08-19 15:09:36 +0300493
494 return 0;
495}
496
497static struct platform_driver isp1704_charger_driver = {
498 .driver = {
499 .name = "isp1704_charger",
500 },
501 .probe = isp1704_charger_probe,
Bill Pemberton28ea73f2012-11-19 13:20:40 -0500502 .remove = isp1704_charger_remove,
Heikki Krogerusec464752010-08-19 15:09:36 +0300503};
504
Axel Lin300bac72011-11-26 12:01:10 +0800505module_platform_driver(isp1704_charger_driver);
Heikki Krogerusec464752010-08-19 15:09:36 +0300506
507MODULE_ALIAS("platform:isp1704_charger");
508MODULE_AUTHOR("Nokia Corporation");
509MODULE_DESCRIPTION("ISP170x USB Charger driver");
510MODULE_LICENSE("GPL");