[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / power / isp1704_charger.c

/*
 * ISP1704 USB Charger Detection driver
 *
 * Copyright (C) 2010 Nokia Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/device.h>
#include <linux/sysfs.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/delay.h>

#include <linux/usb/otg.h>
#include <linux/usb/ulpi.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>

/* Vendor specific Power Control register */
#define ISP1704_PWR_CTRL		0x3d
#define ISP1704_PWR_CTRL_SWCTRL		(1 << 0)
#define ISP1704_PWR_CTRL_DET_COMP	(1 << 1)
#define ISP1704_PWR_CTRL_BVALID_RISE	(1 << 2)
#define ISP1704_PWR_CTRL_BVALID_FALL	(1 << 3)
#define ISP1704_PWR_CTRL_DP_WKPU_EN	(1 << 4)
#define ISP1704_PWR_CTRL_VDAT_DET	(1 << 5)
#define ISP1704_PWR_CTRL_DPVSRC_EN	(1 << 6)
#define ISP1704_PWR_CTRL_HWDETECT	(1 << 7)

#define NXP_VENDOR_ID			0x04cc

static u16 isp170x_id[] = {
	0x1704,
	0x1707,
};

struct isp1704_charger {
	struct device		*dev;
	struct power_supply	psy;
	struct otg_transceiver	*otg;
	struct notifier_block	nb;
	struct work_struct	work;

	char			model[7];
	unsigned		present:1;
};

/*
 * ISP1704 detects PS/2 adapters as charger. To make sure the detected charger
 * is actually a dedicated charger, the following steps need to be taken.
 */
static inline int isp1704_charger_verify(struct isp1704_charger *isp)
{
	int	ret = 0;
	u8	r;

	/* Reset the transceiver */
	r = otg_io_read(isp->otg, ULPI_FUNC_CTRL);
	r |= ULPI_FUNC_CTRL_RESET;
	otg_io_write(isp->otg, ULPI_FUNC_CTRL, r);
	usleep_range(1000, 2000);

	/* Set normal mode */
	r &= ~(ULPI_FUNC_CTRL_RESET | ULPI_FUNC_CTRL_OPMODE_MASK);
	otg_io_write(isp->otg, ULPI_FUNC_CTRL, r);

	/* Clear the DP and DM pull-down bits */
	r = ULPI_OTG_CTRL_DP_PULLDOWN | ULPI_OTG_CTRL_DM_PULLDOWN;
	otg_io_write(isp->otg, ULPI_CLR(ULPI_OTG_CTRL), r);

	/* Enable strong pull-up on DP (1.5K) and reset */
	r = ULPI_FUNC_CTRL_TERMSELECT | ULPI_FUNC_CTRL_RESET;
	otg_io_write(isp->otg, ULPI_SET(ULPI_FUNC_CTRL), r);
	usleep_range(1000, 2000);

	/* Read the line state */
	if (!otg_io_read(isp->otg, ULPI_DEBUG)) {
		/* Disable strong pull-up on DP (1.5K) */
		otg_io_write(isp->otg, ULPI_CLR(ULPI_FUNC_CTRL),
				ULPI_FUNC_CTRL_TERMSELECT);
		return 1;
	}

	/* Is it a charger or PS/2 connection */

	/* Enable weak pull-up resistor on DP */
	otg_io_write(isp->otg, ULPI_SET(ISP1704_PWR_CTRL),
			ISP1704_PWR_CTRL_DP_WKPU_EN);

	/* Disable strong pull-up on DP (1.5K) */
	otg_io_write(isp->otg, ULPI_CLR(ULPI_FUNC_CTRL),
			ULPI_FUNC_CTRL_TERMSELECT);

	/* Enable weak pull-down resistor on DM */
	otg_io_write(isp->otg, ULPI_SET(ULPI_OTG_CTRL),
			ULPI_OTG_CTRL_DM_PULLDOWN);

	/* It's a charger if the line states are clear */
	if (!(otg_io_read(isp->otg, ULPI_DEBUG)))
		ret = 1;

	/* Disable weak pull-up resistor on DP */
	otg_io_write(isp->otg, ULPI_CLR(ISP1704_PWR_CTRL),
			ISP1704_PWR_CTRL_DP_WKPU_EN);

	return ret;
}

static inline int isp1704_charger_detect(struct isp1704_charger *isp)
{
	unsigned long	timeout;
	u8		r;
	int		ret = 0;

	/* set SW control bit in PWR_CTRL register */
	otg_io_write(isp->otg, ISP1704_PWR_CTRL,
			ISP1704_PWR_CTRL_SWCTRL);

	/* enable manual charger detection */
	r = (ISP1704_PWR_CTRL_SWCTRL | ISP1704_PWR_CTRL_DPVSRC_EN);
	otg_io_write(isp->otg, ULPI_SET(ISP1704_PWR_CTRL), r);
	usleep_range(1000, 2000);

	timeout = jiffies + msecs_to_jiffies(300);
	do {
		/* Check if there is a charger */
		if (otg_io_read(isp->otg, ISP1704_PWR_CTRL)
				& ISP1704_PWR_CTRL_VDAT_DET) {
			ret = isp1704_charger_verify(isp);
			break;
		}
	} while (!time_after(jiffies, timeout));

	return ret;
}

static void isp1704_charger_work(struct work_struct *data)
{
	int			detect;
	struct isp1704_charger	*isp =
		container_of(data, struct isp1704_charger, work);

	/*
	 * FIXME Only supporting dedicated chargers even though isp1704 can
	 * detect HUB and HOST chargers. If the device has already been
	 * enumerated, the detection will break the connection.
	 */
	if (isp->otg->state != OTG_STATE_B_IDLE)
		return;

	/* disable data pullups */
	if (isp->otg->gadget)
		usb_gadget_disconnect(isp->otg->gadget);

	/* detect charger */
	detect = isp1704_charger_detect(isp);
	if (detect) {
		isp->present = detect;
		power_supply_changed(&isp->psy);
	}

	/* enable data pullups */
	if (isp->otg->gadget)
		usb_gadget_connect(isp->otg->gadget);
}

static int isp1704_notifier_call(struct notifier_block *nb,
		unsigned long event, void *unused)
{
	struct isp1704_charger *isp =
		container_of(nb, struct isp1704_charger, nb);

	switch (event) {
	case USB_EVENT_VBUS:
		schedule_work(&isp->work);
		break;
	case USB_EVENT_NONE:
		if (isp->present) {
			isp->present = 0;
			power_supply_changed(&isp->psy);
		}
		break;
	default:
		return NOTIFY_DONE;
	}

	return NOTIFY_OK;
}

static int isp1704_charger_get_property(struct power_supply *psy,
				enum power_supply_property psp,
				union power_supply_propval *val)
{
	struct isp1704_charger *isp =
		container_of(psy, struct isp1704_charger, psy);

	switch (psp) {
	case POWER_SUPPLY_PROP_PRESENT:
		val->intval = isp->present;
		break;
	case POWER_SUPPLY_PROP_MODEL_NAME:
		val->strval = isp->model;
		break;
	case POWER_SUPPLY_PROP_MANUFACTURER:
		val->strval = "NXP";
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static enum power_supply_property power_props[] = {
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_MODEL_NAME,
	POWER_SUPPLY_PROP_MANUFACTURER,
};

static inline int isp1704_test_ulpi(struct isp1704_charger *isp)
{
	int vendor;
	int product;
	int i;
	int ret = -ENODEV;

	/* Test ULPI interface */
	ret = otg_io_write(isp->otg, ULPI_SCRATCH, 0xaa);
	if (ret < 0)
		return ret;

	ret = otg_io_read(isp->otg, ULPI_SCRATCH);
	if (ret < 0)
		return ret;

	if (ret != 0xaa)
		return -ENODEV;

	/* Verify the product and vendor id matches */
	vendor = otg_io_read(isp->otg, ULPI_VENDOR_ID_LOW);
	vendor |= otg_io_read(isp->otg, ULPI_VENDOR_ID_HIGH) << 8;
	if (vendor != NXP_VENDOR_ID)
		return -ENODEV;

	product = otg_io_read(isp->otg, ULPI_PRODUCT_ID_LOW);
	product |= otg_io_read(isp->otg, ULPI_PRODUCT_ID_HIGH) << 8;

	for (i = 0; i < ARRAY_SIZE(isp170x_id); i++) {
		if (product == isp170x_id[i]) {
			sprintf(isp->model, "isp%x", product);
			return product;
		}
	}

	dev_err(isp->dev, "product id %x not matching known ids", product);

	return -ENODEV;
}

static int __devinit isp1704_charger_probe(struct platform_device *pdev)
{
	struct isp1704_charger	*isp;
	int			ret = -ENODEV;

	isp = kzalloc(sizeof *isp, GFP_KERNEL);
	if (!isp)
		return -ENOMEM;

	isp->otg = otg_get_transceiver();
	if (!isp->otg)
		goto fail0;

	ret = isp1704_test_ulpi(isp);
	if (ret < 0)
		goto fail1;

	isp->dev = &pdev->dev;
	platform_set_drvdata(pdev, isp);

	isp->psy.name		= "isp1704";
	isp->psy.type		= POWER_SUPPLY_TYPE_USB;
	isp->psy.properties	= power_props;
	isp->psy.num_properties	= ARRAY_SIZE(power_props);
	isp->psy.get_property	= isp1704_charger_get_property;

	ret = power_supply_register(isp->dev, &isp->psy);
	if (ret)
		goto fail1;

	/*
	 * REVISIT: using work in order to allow the otg notifications to be
	 * made atomically in the future.
	 */
	INIT_WORK(&isp->work, isp1704_charger_work);

	isp->nb.notifier_call = isp1704_notifier_call;

	ret = otg_register_notifier(isp->otg, &isp->nb);
	if (ret)
		goto fail2;

	dev_info(isp->dev, "registered with product id %s\n", isp->model);

	return 0;
fail2:
	power_supply_unregister(&isp->psy);
fail1:
	otg_put_transceiver(isp->otg);
fail0:
	kfree(isp);

	dev_err(&pdev->dev, "failed to register isp1704 with error %d\n", ret);

	return ret;
}

static int __devexit isp1704_charger_remove(struct platform_device *pdev)
{
	struct isp1704_charger *isp = platform_get_drvdata(pdev);

	otg_unregister_notifier(isp->otg, &isp->nb);
	power_supply_unregister(&isp->psy);
	otg_put_transceiver(isp->otg);
	kfree(isp);

	return 0;
}

static struct platform_driver isp1704_charger_driver = {
	.driver = {
		.name = "isp1704_charger",
	},
	.probe = isp1704_charger_probe,
	.remove = __devexit_p(isp1704_charger_remove),
};

static int __init isp1704_charger_init(void)
{
	return platform_driver_register(&isp1704_charger_driver);
}
module_init(isp1704_charger_init);

static void __exit isp1704_charger_exit(void)
{
	platform_driver_unregister(&isp1704_charger_driver);
}
module_exit(isp1704_charger_exit);

MODULE_ALIAS("platform:isp1704_charger");
MODULE_AUTHOR("Nokia Corporation");
MODULE_DESCRIPTION("ISP170x USB Charger driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
ec46475f HK	1	/*
	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>
	36
	37	/* Vendor specific Power Control register */
	38	#define ISP1704_PWR_CTRL 0x3d
	39	#define ISP1704_PWR_CTRL_SWCTRL (1 << 0)
	40	#define ISP1704_PWR_CTRL_DET_COMP (1 << 1)
	41	#define ISP1704_PWR_CTRL_BVALID_RISE (1 << 2)
	42	#define ISP1704_PWR_CTRL_BVALID_FALL (1 << 3)
	43	#define ISP1704_PWR_CTRL_DP_WKPU_EN (1 << 4)
	44	#define ISP1704_PWR_CTRL_VDAT_DET (1 << 5)
	45	#define ISP1704_PWR_CTRL_DPVSRC_EN (1 << 6)
	46	#define ISP1704_PWR_CTRL_HWDETECT (1 << 7)
	47
	48	#define NXP_VENDOR_ID 0x04cc
	49
	50	static u16 isp170x_id[] = {
	51	0x1704,
	52	0x1707,
	53	};
	54
	55	struct isp1704_charger {
	56	struct device *dev;
	57	struct power_supply psy;
	58	struct otg_transceiver *otg;
	59	struct notifier_block nb;
	60	struct work_struct work;
	61
	62	char model[7];
	63	unsigned present:1;
	64	};
65
66	/*
67	* ISP1704 detects PS/2 adapters as charger. To make sure the detected charger
68	* is actually a dedicated charger, the following steps need to be taken.
69	*/
70	static inline int isp1704_charger_verify(struct isp1704_charger *isp)
71	{
72	int ret = 0;
73	u8 r;
74
75	/* Reset the transceiver */
76	r = otg_io_read(isp->otg, ULPI_FUNC_CTRL);
77	r \|= ULPI_FUNC_CTRL_RESET;
78	otg_io_write(isp->otg, ULPI_FUNC_CTRL, r);
79	usleep_range(1000, 2000);
80
81	/* Set normal mode */
82	r &= ~(ULPI_FUNC_CTRL_RESET \| ULPI_FUNC_CTRL_OPMODE_MASK);
83	otg_io_write(isp->otg, ULPI_FUNC_CTRL, r);
84
85	/* Clear the DP and DM pull-down bits */
86	r = ULPI_OTG_CTRL_DP_PULLDOWN \| ULPI_OTG_CTRL_DM_PULLDOWN;
87	otg_io_write(isp->otg, ULPI_CLR(ULPI_OTG_CTRL), r);
88
89	/* Enable strong pull-up on DP (1.5K) and reset */
90	r = ULPI_FUNC_CTRL_TERMSELECT \| ULPI_FUNC_CTRL_RESET;
91	otg_io_write(isp->otg, ULPI_SET(ULPI_FUNC_CTRL), r);
92	usleep_range(1000, 2000);
93
94	/* Read the line state */
95	if (!otg_io_read(isp->otg, ULPI_DEBUG)) {
96	/* Disable strong pull-up on DP (1.5K) */
97	otg_io_write(isp->otg, ULPI_CLR(ULPI_FUNC_CTRL),
98	ULPI_FUNC_CTRL_TERMSELECT);
99	return 1;
100	}
101
102	/* Is it a charger or PS/2 connection */
103
104	/* Enable weak pull-up resistor on DP */
105	otg_io_write(isp->otg, ULPI_SET(ISP1704_PWR_CTRL),
106	ISP1704_PWR_CTRL_DP_WKPU_EN);
107
108	/* Disable strong pull-up on DP (1.5K) */
109	otg_io_write(isp->otg, ULPI_CLR(ULPI_FUNC_CTRL),
110	ULPI_FUNC_CTRL_TERMSELECT);
111
112	/* Enable weak pull-down resistor on DM */
113	otg_io_write(isp->otg, ULPI_SET(ULPI_OTG_CTRL),
114	ULPI_OTG_CTRL_DM_PULLDOWN);
115
116	/* It's a charger if the line states are clear */
117	if (!(otg_io_read(isp->otg, ULPI_DEBUG)))
118	ret = 1;
119
120	/* Disable weak pull-up resistor on DP */
121	otg_io_write(isp->otg, ULPI_CLR(ISP1704_PWR_CTRL),
122	ISP1704_PWR_CTRL_DP_WKPU_EN);
123
124	return ret;
125	}
126
127	static inline int isp1704_charger_detect(struct isp1704_charger *isp)
128	{
129	unsigned long timeout;
130	u8 r;
131	int ret = 0;
132
133	/* set SW control bit in PWR_CTRL register */
134	otg_io_write(isp->otg, ISP1704_PWR_CTRL,
135	ISP1704_PWR_CTRL_SWCTRL);
136
137	/* enable manual charger detection */
138	r = (ISP1704_PWR_CTRL_SWCTRL \| ISP1704_PWR_CTRL_DPVSRC_EN);
139	otg_io_write(isp->otg, ULPI_SET(ISP1704_PWR_CTRL), r);
140	usleep_range(1000, 2000);
141
142	timeout = jiffies + msecs_to_jiffies(300);
143	do {
144	/* Check if there is a charger */
145	if (otg_io_read(isp->otg, ISP1704_PWR_CTRL)
146	& ISP1704_PWR_CTRL_VDAT_DET) {
147	ret = isp1704_charger_verify(isp);
148	break;
149	}
150	} while (!time_after(jiffies, timeout));
151
152	return ret;
153	}
154
155	static void isp1704_charger_work(struct work_struct *data)
156	{
157	int detect;
158	struct isp1704_charger *isp =
159	container_of(data, struct isp1704_charger, work);
160
161	/*
162	* FIXME Only supporting dedicated chargers even though isp1704 can
163	* detect HUB and HOST chargers. If the device has already been
164	* enumerated, the detection will break the connection.
165	*/
166	if (isp->otg->state != OTG_STATE_B_IDLE)
167	return;
168
169	/* disable data pullups */
170	if (isp->otg->gadget)
171	usb_gadget_disconnect(isp->otg->gadget);
172
173	/* detect charger */
174	detect = isp1704_charger_detect(isp);
175	if (detect) {
176	isp->present = detect;
177	power_supply_changed(&isp->psy);
178	}
179
180	/* enable data pullups */
181	if (isp->otg->gadget)
182	usb_gadget_connect(isp->otg->gadget);
183	}
184
185	static int isp1704_notifier_call(struct notifier_block *nb,
186	unsigned long event, void *unused)
187	{
188	struct isp1704_charger *isp =
189	container_of(nb, struct isp1704_charger, nb);
190
191	switch (event) {
192	case USB_EVENT_VBUS:
193	schedule_work(&isp->work);
194	break;
195	case USB_EVENT_NONE:
196	if (isp->present) {
197	isp->present = 0;
198	power_supply_changed(&isp->psy);
199	}
200	break;
201	default:
202	return NOTIFY_DONE;
203	}
204
205	return NOTIFY_OK;
206	}
207
208	static int isp1704_charger_get_property(struct power_supply *psy,
209	enum power_supply_property psp,
210	union power_supply_propval *val)
211	{
212	struct isp1704_charger *isp =
213	container_of(psy, struct isp1704_charger, psy);
214
215	switch (psp) {
216	case POWER_SUPPLY_PROP_PRESENT:
217	val->intval = isp->present;
218	break;
219	case POWER_SUPPLY_PROP_MODEL_NAME:
220	val->strval = isp->model;
221	break;
222	case POWER_SUPPLY_PROP_MANUFACTURER:
223	val->strval = "NXP";
224	break;
225	default:
226	return -EINVAL;
227	}
228	return 0;
229	}
230
231	static enum power_supply_property power_props[] = {
232	POWER_SUPPLY_PROP_PRESENT,
233	POWER_SUPPLY_PROP_MODEL_NAME,
234	POWER_SUPPLY_PROP_MANUFACTURER,
235	};
236
237	static inline int isp1704_test_ulpi(struct isp1704_charger *isp)
238	{
239	int vendor;
240	int product;
241	int i;
242	int ret = -ENODEV;
243
244	/* Test ULPI interface */
245	ret = otg_io_write(isp->otg, ULPI_SCRATCH, 0xaa);
246	if (ret < 0)
247	return ret;
248
249	ret = otg_io_read(isp->otg, ULPI_SCRATCH);
250	if (ret < 0)
251	return ret;
252
253	if (ret != 0xaa)
254	return -ENODEV;
255
256	/* Verify the product and vendor id matches */
257	vendor = otg_io_read(isp->otg, ULPI_VENDOR_ID_LOW);
258	vendor \|= otg_io_read(isp->otg, ULPI_VENDOR_ID_HIGH) << 8;
259	if (vendor != NXP_VENDOR_ID)
260	return -ENODEV;
261
262	product = otg_io_read(isp->otg, ULPI_PRODUCT_ID_LOW);
263	product \|= otg_io_read(isp->otg, ULPI_PRODUCT_ID_HIGH) << 8;
264
265	for (i = 0; i < ARRAY_SIZE(isp170x_id); i++) {
266	if (product == isp170x_id[i]) {
267	sprintf(isp->model, "isp%x", product);
268	return product;
269	}
270	}
271
272	dev_err(isp->dev, "product id %x not matching known ids", product);
273
274	return -ENODEV;
275	}
276
277	static int __devinit isp1704_charger_probe(struct platform_device *pdev)
278	{
279	struct isp1704_charger *isp;
280	int ret = -ENODEV;
281
282	isp = kzalloc(sizeof *isp, GFP_KERNEL);
283	if (!isp)
284	return -ENOMEM;
285
286	isp->otg = otg_get_transceiver();
287	if (!isp->otg)
288	goto fail0;
289
290	ret = isp1704_test_ulpi(isp);
291	if (ret < 0)
292	goto fail1;
293
294	isp->dev = &pdev->dev;
295	platform_set_drvdata(pdev, isp);
296
297	isp->psy.name = "isp1704";
298	isp->psy.type = POWER_SUPPLY_TYPE_USB;
299	isp->psy.properties = power_props;
300	isp->psy.num_properties = ARRAY_SIZE(power_props);
301	isp->psy.get_property = isp1704_charger_get_property;
302
303	ret = power_supply_register(isp->dev, &isp->psy);
304	if (ret)
305	goto fail1;
306
307	/*
308	* REVISIT: using work in order to allow the otg notifications to be
309	* made atomically in the future.
310	*/
311	INIT_WORK(&isp->work, isp1704_charger_work);
312
313	isp->nb.notifier_call = isp1704_notifier_call;
314
315	ret = otg_register_notifier(isp->otg, &isp->nb);
316	if (ret)
317	goto fail2;
318
319	dev_info(isp->dev, "registered with product id %s\n", isp->model);
320
321	return 0;
322	fail2:
323	power_supply_unregister(&isp->psy);
324	fail1:
325	otg_put_transceiver(isp->otg);
326	fail0:
327	kfree(isp);
328
329	dev_err(&pdev->dev, "failed to register isp1704 with error %d\n", ret);
330
331	return ret;
332	}
333
334	static int __devexit isp1704_charger_remove(struct platform_device *pdev)
335	{
336	struct isp1704_charger *isp = platform_get_drvdata(pdev);
337
338	otg_unregister_notifier(isp->otg, &isp->nb);
339	power_supply_unregister(&isp->psy);
340	otg_put_transceiver(isp->otg);
341	kfree(isp);
342
343	return 0;
344	}
345
346	static struct platform_driver isp1704_charger_driver = {
347	.driver = {
348	.name = "isp1704_charger",
349	},
350	.probe = isp1704_charger_probe,
351	.remove = __devexit_p(isp1704_charger_remove),
352	};
353
354	static int __init isp1704_charger_init(void)
355	{
356	return platform_driver_register(&isp1704_charger_driver);
357	}
358	module_init(isp1704_charger_init);
359
360	static void __exit isp1704_charger_exit(void)
361	{
362	platform_driver_unregister(&isp1704_charger_driver);
363	}
364	module_exit(isp1704_charger_exit);
365
366	MODULE_ALIAS("platform:isp1704_charger");
367	MODULE_AUTHOR("Nokia Corporation");
368	MODULE_DESCRIPTION("ISP170x USB Charger driver");
369	MODULE_LICENSE("GPL");