[mirror_ubuntu-bionic-kernel.git] / drivers / rtc / rtc-hid-sensor-time.c

/*
 * HID Sensor Time Driver
 * Copyright (c) 2012, Alexander Holler.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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.,
 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 *
 */
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/hid-sensor-hub.h>
#include <linux/iio/iio.h>
#include <linux/rtc.h>

enum hid_time_channel {
	CHANNEL_SCAN_INDEX_YEAR,
	CHANNEL_SCAN_INDEX_MONTH,
	CHANNEL_SCAN_INDEX_DAY,
	CHANNEL_SCAN_INDEX_HOUR,
	CHANNEL_SCAN_INDEX_MINUTE,
	CHANNEL_SCAN_INDEX_SECOND,
	TIME_RTC_CHANNEL_MAX,
};

struct hid_time_state {
	struct hid_sensor_hub_callbacks callbacks;
	struct hid_sensor_common common_attributes;
	struct hid_sensor_hub_attribute_info info[TIME_RTC_CHANNEL_MAX];
	struct rtc_time last_time;
	spinlock_t lock_last_time;
	struct completion comp_last_time;
	struct rtc_time time_buf;
	struct rtc_device *rtc;
};

static const u32 hid_time_addresses[TIME_RTC_CHANNEL_MAX] = {
	HID_USAGE_SENSOR_TIME_YEAR,
	HID_USAGE_SENSOR_TIME_MONTH,
	HID_USAGE_SENSOR_TIME_DAY,
	HID_USAGE_SENSOR_TIME_HOUR,
	HID_USAGE_SENSOR_TIME_MINUTE,
	HID_USAGE_SENSOR_TIME_SECOND,
};

/* Channel names for verbose error messages */
static const char * const hid_time_channel_names[TIME_RTC_CHANNEL_MAX] = {
	"year", "month", "day", "hour", "minute", "second",
};

/* Callback handler to send event after all samples are received and captured */
static int hid_time_proc_event(struct hid_sensor_hub_device *hsdev,
				unsigned usage_id, void *priv)
{
	unsigned long flags;
	struct hid_time_state *time_state = platform_get_drvdata(priv);

	spin_lock_irqsave(&time_state->lock_last_time, flags);
	time_state->last_time = time_state->time_buf;
	spin_unlock_irqrestore(&time_state->lock_last_time, flags);
	complete(&time_state->comp_last_time);
	return 0;
}

static u32 hid_time_value(size_t raw_len, char *raw_data)
{
	switch (raw_len) {
	case 1:
		return *(u8 *)raw_data;
	case 2:
		return *(u16 *)raw_data;
	case 4:
		return *(u32 *)raw_data;
	default:
		return (u32)(~0U); /* 0xff... or -1 to denote an error */
	}
}

static int hid_time_capture_sample(struct hid_sensor_hub_device *hsdev,
				unsigned usage_id, size_t raw_len,
				char *raw_data, void *priv)
{
	struct hid_time_state *time_state = platform_get_drvdata(priv);
	struct rtc_time *time_buf = &time_state->time_buf;

	switch (usage_id) {
	case HID_USAGE_SENSOR_TIME_YEAR:
		/*
		 * The draft for HID-sensors (HUTRR39) currently doesn't define
		 * the range for the year attribute. Therefor we support
		 * 8 bit (0-99) and 16 or 32 bits (full) as size for the year.
		 */
		if (raw_len == 1) {
			time_buf->tm_year = *(u8 *)raw_data;
			if (time_buf->tm_year < 70)
				/* assume we are in 1970...2069 */
				time_buf->tm_year += 100;
		} else
			time_buf->tm_year =
				(int)hid_time_value(raw_len, raw_data)-1900;
		break;
	case HID_USAGE_SENSOR_TIME_MONTH:
		/* sensors are sending the month as 1-12, we need 0-11 */
		time_buf->tm_mon = (int)hid_time_value(raw_len, raw_data)-1;
		break;
	case HID_USAGE_SENSOR_TIME_DAY:
		time_buf->tm_mday = (int)hid_time_value(raw_len, raw_data);
		break;
	case HID_USAGE_SENSOR_TIME_HOUR:
		time_buf->tm_hour = (int)hid_time_value(raw_len, raw_data);
		break;
	case HID_USAGE_SENSOR_TIME_MINUTE:
		time_buf->tm_min = (int)hid_time_value(raw_len, raw_data);
		break;
	case HID_USAGE_SENSOR_TIME_SECOND:
		time_buf->tm_sec = (int)hid_time_value(raw_len, raw_data);
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

/* small helper, haven't found any other way */
static const char *hid_time_attrib_name(u32 attrib_id)
{
	static const char unknown[] = "unknown";
	unsigned i;

	for (i = 0; i < TIME_RTC_CHANNEL_MAX; ++i) {
		if (hid_time_addresses[i] == attrib_id)
			return hid_time_channel_names[i];
	}
	return unknown; /* should never happen */
}

static int hid_time_parse_report(struct platform_device *pdev,
				struct hid_sensor_hub_device *hsdev,
				unsigned usage_id,
				struct hid_time_state *time_state)
{
	int report_id, i;

	for (i = 0; i < TIME_RTC_CHANNEL_MAX; ++i)
		if (sensor_hub_input_get_attribute_info(hsdev,
				HID_INPUT_REPORT, usage_id,
				hid_time_addresses[i],
				&time_state->info[i]) < 0)
			return -EINVAL;
	/* Check the (needed) attributes for sanity */
	report_id = time_state->info[0].report_id;
	if (report_id < 0) {
		dev_err(&pdev->dev, "bad report ID!\n");
		return -EINVAL;
	}
	for (i = 0; i < TIME_RTC_CHANNEL_MAX; ++i) {
		if (time_state->info[i].report_id != report_id) {
			dev_err(&pdev->dev,
				"not all needed attributes inside the same report!\n");
			return -EINVAL;
		}
		if (time_state->info[i].size == 3 ||
				time_state->info[i].size > 4) {
			dev_err(&pdev->dev,
				"attribute '%s' not 8, 16 or 32 bits wide!\n",
				hid_time_attrib_name(
					time_state->info[i].attrib_id));
			return -EINVAL;
		}
		if (time_state->info[i].units !=
				HID_USAGE_SENSOR_UNITS_NOT_SPECIFIED &&
				/* allow attribute seconds with unit seconds */
				!(time_state->info[i].attrib_id ==
				HID_USAGE_SENSOR_TIME_SECOND &&
				time_state->info[i].units ==
				HID_USAGE_SENSOR_UNITS_SECOND)) {
			dev_err(&pdev->dev,
				"attribute '%s' hasn't a unit of type 'none'!\n",
				hid_time_attrib_name(
					time_state->info[i].attrib_id));
			return -EINVAL;
		}
		if (time_state->info[i].unit_expo) {
			dev_err(&pdev->dev,
				"attribute '%s' hasn't a unit exponent of 1!\n",
				hid_time_attrib_name(
					time_state->info[i].attrib_id));
			return -EINVAL;
		}
	}

	return 0;
}

static int hid_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	unsigned long flags;
	struct hid_time_state *time_state =
		platform_get_drvdata(to_platform_device(dev));
	int ret;

	reinit_completion(&time_state->comp_last_time);
	/* get a report with all values through requesting one value */
	sensor_hub_input_attr_get_raw_value(time_state->common_attributes.hsdev,
			HID_USAGE_SENSOR_TIME, hid_time_addresses[0],
			time_state->info[0].report_id, SENSOR_HUB_SYNC);
	/* wait for all values (event) */
	ret = wait_for_completion_killable_timeout(
			&time_state->comp_last_time, HZ*6);
	if (ret > 0) {
		/* no error */
		spin_lock_irqsave(&time_state->lock_last_time, flags);
		*tm = time_state->last_time;
		spin_unlock_irqrestore(&time_state->lock_last_time, flags);
		return 0;
	}
	if (!ret)
		return -EIO; /* timeouted */
	return ret; /* killed (-ERESTARTSYS) */
}

static const struct rtc_class_ops hid_time_rtc_ops = {
	.read_time = hid_rtc_read_time,
};

static int hid_time_probe(struct platform_device *pdev)
{
	int ret = 0;
	struct hid_sensor_hub_device *hsdev = dev_get_platdata(&pdev->dev);
	struct hid_time_state *time_state = devm_kzalloc(&pdev->dev,
		sizeof(struct hid_time_state), GFP_KERNEL);

	if (time_state == NULL)
		return -ENOMEM;

	platform_set_drvdata(pdev, time_state);

	spin_lock_init(&time_state->lock_last_time);
	init_completion(&time_state->comp_last_time);
	time_state->common_attributes.hsdev = hsdev;
	time_state->common_attributes.pdev = pdev;

	ret = hid_sensor_parse_common_attributes(hsdev,
				HID_USAGE_SENSOR_TIME,
				&time_state->common_attributes);
	if (ret) {
		dev_err(&pdev->dev, "failed to setup common attributes!\n");
		return ret;
	}

	ret = hid_time_parse_report(pdev, hsdev, HID_USAGE_SENSOR_TIME,
					time_state);
	if (ret) {
		dev_err(&pdev->dev, "failed to setup attributes!\n");
		return ret;
	}

	time_state->callbacks.send_event = hid_time_proc_event;
	time_state->callbacks.capture_sample = hid_time_capture_sample;
	time_state->callbacks.pdev = pdev;
	ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_TIME,
					&time_state->callbacks);
	if (ret < 0) {
		dev_err(&pdev->dev, "register callback failed!\n");
		return ret;
	}

	ret = sensor_hub_device_open(hsdev);
	if (ret) {
		dev_err(&pdev->dev, "failed to open sensor hub device!\n");
		goto err_open;
	}

	/*
	 * Enable HID input processing early in order to be able to read the
	 * clock already in devm_rtc_device_register().
	 */
	hid_device_io_start(hsdev->hdev);

	time_state->rtc = devm_rtc_device_register(&pdev->dev,
					"hid-sensor-time", &hid_time_rtc_ops,
					THIS_MODULE);

	if (IS_ERR(time_state->rtc)) {
		hid_device_io_stop(hsdev->hdev);
		ret = PTR_ERR(time_state->rtc);
		time_state->rtc = NULL;
		dev_err(&pdev->dev, "rtc device register failed!\n");
		goto err_rtc;
	}

	return ret;

err_rtc:
	sensor_hub_device_close(hsdev);
err_open:
	sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_TIME);
	return ret;
}

static int hid_time_remove(struct platform_device *pdev)
{
	struct hid_sensor_hub_device *hsdev = dev_get_platdata(&pdev->dev);

	sensor_hub_device_close(hsdev);
	sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_TIME);

	return 0;
}

static const struct platform_device_id hid_time_ids[] = {
	{
		/* Format: HID-SENSOR-usage_id_in_hex_lowercase */
		.name = "HID-SENSOR-2000a0",
	},
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, hid_time_ids);

static struct platform_driver hid_time_platform_driver = {
	.id_table = hid_time_ids,
	.driver = {
		.name	= KBUILD_MODNAME,
	},
	.probe		= hid_time_probe,
	.remove		= hid_time_remove,
};
module_platform_driver(hid_time_platform_driver);

MODULE_DESCRIPTION("HID Sensor Time");
MODULE_AUTHOR("Alexander Holler <holler@ahsoftware.de>");
MODULE_LICENSE("GPL");
Commit	Line	Data
62e00cb9 AH	1	/*
	2	* HID Sensor Time Driver
	3	* Copyright (c) 2012, Alexander Holler.
	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms and conditions of the GNU General Public License,
	7	* version 2, as published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope it will be useful, but WITHOUT
	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	12	* more details.
	13	*
	14	* You should have received a copy of the GNU General Public License along with
	15	* this program; if not, write to the Free Software Foundation, Inc.,
	16	* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
	17	*
	18	*/
	19	#include <linux/device.h>
	20	#include <linux/platform_device.h>
	21	#include <linux/module.h>
	22	#include <linux/hid-sensor-hub.h>
	23	#include <linux/iio/iio.h>
	24	#include <linux/rtc.h>
	25
62e00cb9 AH	26	enum hid_time_channel {
	27	CHANNEL_SCAN_INDEX_YEAR,
	28	CHANNEL_SCAN_INDEX_MONTH,
	29	CHANNEL_SCAN_INDEX_DAY,
	30	CHANNEL_SCAN_INDEX_HOUR,
	31	CHANNEL_SCAN_INDEX_MINUTE,
	32	CHANNEL_SCAN_INDEX_SECOND,
	33	TIME_RTC_CHANNEL_MAX,
	34	};
	35
	36	struct hid_time_state {
	37	struct hid_sensor_hub_callbacks callbacks;
e07c6d17	38	struct hid_sensor_common common_attributes;
62e00cb9 AH	39	struct hid_sensor_hub_attribute_info info[TIME_RTC_CHANNEL_MAX];
	40	struct rtc_time last_time;
	41	spinlock_t lock_last_time;
	42	struct completion comp_last_time;
	43	struct rtc_time time_buf;
	44	struct rtc_device *rtc;
	45	};
	46
	47	static const u32 hid_time_addresses[TIME_RTC_CHANNEL_MAX] = {
	48	HID_USAGE_SENSOR_TIME_YEAR,
	49	HID_USAGE_SENSOR_TIME_MONTH,
	50	HID_USAGE_SENSOR_TIME_DAY,
	51	HID_USAGE_SENSOR_TIME_HOUR,
	52	HID_USAGE_SENSOR_TIME_MINUTE,
	53	HID_USAGE_SENSOR_TIME_SECOND,
	54	};
	55
	56	/* Channel names for verbose error messages */
	57	static const char * const hid_time_channel_names[TIME_RTC_CHANNEL_MAX] = {
	58	"year", "month", "day", "hour", "minute", "second",
	59	};
	60
	61	/* Callback handler to send event after all samples are received and captured */
	62	static int hid_time_proc_event(struct hid_sensor_hub_device *hsdev,
	63	unsigned usage_id, void *priv)
	64	{
	65	unsigned long flags;
	66	struct hid_time_state *time_state = platform_get_drvdata(priv);
	67
	68	spin_lock_irqsave(&time_state->lock_last_time, flags);
	69	time_state->last_time = time_state->time_buf;
	70	spin_unlock_irqrestore(&time_state->lock_last_time, flags);
	71	complete(&time_state->comp_last_time);
	72	return 0;
	73	}
	74
c67d96e3 AH	75	static u32 hid_time_value(size_t raw_len, char *raw_data)
	76	{
	77	switch (raw_len) {
	78	case 1:
	79	return (u8 )raw_data;
	80	case 2:
	81	return (u16 )raw_data;
	82	case 4:
	83	return (u32 )raw_data;
	84	default:
	85	return (u32)(~0U); /* 0xff... or -1 to denote an error */
	86	}
	87	}
	88
62e00cb9 AH	89	static int hid_time_capture_sample(struct hid_sensor_hub_device *hsdev,
	90	unsigned usage_id, size_t raw_len,
	91	char raw_data, void priv)
	92	{
	93	struct hid_time_state *time_state = platform_get_drvdata(priv);
	94	struct rtc_time *time_buf = &time_state->time_buf;
	95
	96	switch (usage_id) {
	97	case HID_USAGE_SENSOR_TIME_YEAR:
c67d96e3 AH	98	/*
	99	* The draft for HID-sensors (HUTRR39) currently doesn't define
	100	* the range for the year attribute. Therefor we support
	101	* 8 bit (0-99) and 16 or 32 bits (full) as size for the year.
	102	*/
7e3c741a AH	103	if (raw_len == 1) {
	104	time_buf->tm_year = (u8 )raw_data;
	105	if (time_buf->tm_year < 70)
	106	/* assume we are in 1970...2069 */
	107	time_buf->tm_year += 100;
	108	} else
c67d96e3 AH	109	time_buf->tm_year =
c67d96e3 AH	110	(int)hid_time_value(raw_len, raw_data)-1900;
62e00cb9 AH	111	break;
62e00cb9 AH	112	case HID_USAGE_SENSOR_TIME_MONTH:
c67d96e3 AH	113	/* sensors are sending the month as 1-12, we need 0-11 */
c67d96e3 AH	114	time_buf->tm_mon = (int)hid_time_value(raw_len, raw_data)-1;
62e00cb9 AH	115	break;
62e00cb9 AH	116	case HID_USAGE_SENSOR_TIME_DAY:
c67d96e3	117	time_buf->tm_mday = (int)hid_time_value(raw_len, raw_data);
62e00cb9 AH	118	break;
62e00cb9 AH	119	case HID_USAGE_SENSOR_TIME_HOUR:
c67d96e3	120	time_buf->tm_hour = (int)hid_time_value(raw_len, raw_data);
62e00cb9 AH	121	break;
62e00cb9 AH	122	case HID_USAGE_SENSOR_TIME_MINUTE:
c67d96e3	123	time_buf->tm_min = (int)hid_time_value(raw_len, raw_data);
62e00cb9 AH	124	break;
62e00cb9 AH	125	case HID_USAGE_SENSOR_TIME_SECOND:
c67d96e3	126	time_buf->tm_sec = (int)hid_time_value(raw_len, raw_data);
62e00cb9 AH	127	break;
	128	default:
	129	return -EINVAL;
	130	}
	131	return 0;
	132	}
	133
	134	/* small helper, haven't found any other way */
	135	static const char *hid_time_attrib_name(u32 attrib_id)
	136	{
	137	static const char unknown[] = "unknown";
	138	unsigned i;
	139
	140	for (i = 0; i < TIME_RTC_CHANNEL_MAX; ++i) {
	141	if (hid_time_addresses[i] == attrib_id)
	142	return hid_time_channel_names[i];
	143	}
	144	return unknown; /* should never happen */
	145	}
	146
	147	static int hid_time_parse_report(struct platform_device *pdev,
	148	struct hid_sensor_hub_device *hsdev,
	149	unsigned usage_id,
	150	struct hid_time_state *time_state)
	151	{
	152	int report_id, i;
	153
	154	for (i = 0; i < TIME_RTC_CHANNEL_MAX; ++i)
	155	if (sensor_hub_input_get_attribute_info(hsdev,
	156	HID_INPUT_REPORT, usage_id,
	157	hid_time_addresses[i],
	158	&time_state->info[i]) < 0)
	159	return -EINVAL;
	160	/* Check the (needed) attributes for sanity */
	161	report_id = time_state->info[0].report_id;
	162	if (report_id < 0) {
	163	dev_err(&pdev->dev, "bad report ID!\n");
	164	return -EINVAL;
	165	}
	166	for (i = 0; i < TIME_RTC_CHANNEL_MAX; ++i) {
	167	if (time_state->info[i].report_id != report_id) {
	168	dev_err(&pdev->dev,
	169	"not all needed attributes inside the same report!\n");
	170	return -EINVAL;
	171	}
c67d96e3 AH	172	if (time_state->info[i].size == 3 \|\|
	173	time_state->info[i].size > 4) {
	174	dev_err(&pdev->dev,
	175	"attribute '%s' not 8, 16 or 32 bits wide!\n",
7e3c741a AH	176	hid_time_attrib_name(
7e3c741a AH	177	time_state->info[i].attrib_id));
c67d96e3	178	return -EINVAL;
62e00cb9 AH	179	}
	180	if (time_state->info[i].units !=
	181	HID_USAGE_SENSOR_UNITS_NOT_SPECIFIED &&
	182	/* allow attribute seconds with unit seconds */
	183	!(time_state->info[i].attrib_id ==
	184	HID_USAGE_SENSOR_TIME_SECOND &&
	185	time_state->info[i].units ==
	186	HID_USAGE_SENSOR_UNITS_SECOND)) {
	187	dev_err(&pdev->dev,
	188	"attribute '%s' hasn't a unit of type 'none'!\n",
	189	hid_time_attrib_name(
	190	time_state->info[i].attrib_id));
	191	return -EINVAL;
	192	}
	193	if (time_state->info[i].unit_expo) {
	194	dev_err(&pdev->dev,
	195	"attribute '%s' hasn't a unit exponent of 1!\n",
	196	hid_time_attrib_name(
	197	time_state->info[i].attrib_id));
	198	return -EINVAL;
	199	}
	200	}
	201
	202	return 0;
	203	}
	204
	205	static int hid_rtc_read_time(struct device dev, struct rtc_time tm)
	206	{
	207	unsigned long flags;
	208	struct hid_time_state *time_state =
	209	platform_get_drvdata(to_platform_device(dev));
	210	int ret;
	211
16735d02	212	reinit_completion(&time_state->comp_last_time);
62e00cb9 AH	213	/* get a report with all values through requesting one value */
	214	sensor_hub_input_attr_get_raw_value(time_state->common_attributes.hsdev,
	215	HID_USAGE_SENSOR_TIME, hid_time_addresses[0],
b3f4737d	216	time_state->info[0].report_id, SENSOR_HUB_SYNC);
62e00cb9 AH	217	/* wait for all values (event) */
	218	ret = wait_for_completion_killable_timeout(
	219	&time_state->comp_last_time, HZ*6);
	220	if (ret > 0) {
	221	/* no error */
	222	spin_lock_irqsave(&time_state->lock_last_time, flags);
	223	*tm = time_state->last_time;
	224	spin_unlock_irqrestore(&time_state->lock_last_time, flags);
	225	return 0;
	226	}
	227	if (!ret)
	228	return -EIO; /* timeouted */
	229	return ret; /* killed (-ERESTARTSYS) */
	230	}
	231
	232	static const struct rtc_class_ops hid_time_rtc_ops = {
	233	.read_time = hid_rtc_read_time,
	234	};
	235
	236	static int hid_time_probe(struct platform_device *pdev)
	237	{
	238	int ret = 0;
d5ceede8	239	struct hid_sensor_hub_device *hsdev = dev_get_platdata(&pdev->dev);
62e00cb9 AH	240	struct hid_time_state *time_state = devm_kzalloc(&pdev->dev,
	241	sizeof(struct hid_time_state), GFP_KERNEL);
	242
	243	if (time_state == NULL)
	244	return -ENOMEM;
	245
	246	platform_set_drvdata(pdev, time_state);
	247
b775dce9	248	spin_lock_init(&time_state->lock_last_time);
62e00cb9 AH	249	init_completion(&time_state->comp_last_time);
	250	time_state->common_attributes.hsdev = hsdev;
	251	time_state->common_attributes.pdev = pdev;
	252
	253	ret = hid_sensor_parse_common_attributes(hsdev,
	254	HID_USAGE_SENSOR_TIME,
	255	&time_state->common_attributes);
	256	if (ret) {
	257	dev_err(&pdev->dev, "failed to setup common attributes!\n");
	258	return ret;
	259	}
	260
	261	ret = hid_time_parse_report(pdev, hsdev, HID_USAGE_SENSOR_TIME,
	262	time_state);
	263	if (ret) {
	264	dev_err(&pdev->dev, "failed to setup attributes!\n");
	265	return ret;
	266	}
	267
	268	time_state->callbacks.send_event = hid_time_proc_event;
	269	time_state->callbacks.capture_sample = hid_time_capture_sample;
	270	time_state->callbacks.pdev = pdev;
	271	ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_TIME,
	272	&time_state->callbacks);
	273	if (ret < 0) {
	274	dev_err(&pdev->dev, "register callback failed!\n");
	275	return ret;
	276	}
	277
476b9547 SP	278	ret = sensor_hub_device_open(hsdev);
	279	if (ret) {
	280	dev_err(&pdev->dev, "failed to open sensor hub device!\n");
	281	goto err_open;
	282	}
	283
406bf318 AH	284	/*
	285	* Enable HID input processing early in order to be able to read the
	286	* clock already in devm_rtc_device_register().
	287	*/
	288	hid_device_io_start(hsdev->hdev);
	289
479243b2 JH	290	time_state->rtc = devm_rtc_device_register(&pdev->dev,
	291	"hid-sensor-time", &hid_time_rtc_ops,
	292	THIS_MODULE);
62e00cb9	293
e73ef755	294	if (IS_ERR(time_state->rtc)) {
406bf318	295	hid_device_io_stop(hsdev->hdev);
e73ef755	296	ret = PTR_ERR(time_state->rtc);
7707bda3	297	time_state->rtc = NULL;
62e00cb9	298	dev_err(&pdev->dev, "rtc device register failed!\n");
476b9547	299	goto err_rtc;
62e00cb9 AH	300	}
	301
	302	return ret;
476b9547 SP	303
	304	err_rtc:
	305	sensor_hub_device_close(hsdev);
	306	err_open:
	307	sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_TIME);
	308	return ret;
62e00cb9 AH	309	}
	310
	311	static int hid_time_remove(struct platform_device *pdev)
	312	{
d5ceede8	313	struct hid_sensor_hub_device *hsdev = dev_get_platdata(&pdev->dev);
62e00cb9	314
476b9547	315	sensor_hub_device_close(hsdev);
62e00cb9 AH	316	sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_TIME);
	317
	318	return 0;
	319	}
	320
19fd685f	321	static const struct platform_device_id hid_time_ids[] = {
ae259925 AH	322	{
	323	/* Format: HID-SENSOR-usage_id_in_hex_lowercase */
	324	.name = "HID-SENSOR-2000a0",
	325	},
	326	{ /* sentinel */ }
	327	};
	328	MODULE_DEVICE_TABLE(platform, hid_time_ids);
	329
62e00cb9	330	static struct platform_driver hid_time_platform_driver = {
ae259925	331	.id_table = hid_time_ids,
62e00cb9	332	.driver = {
ae259925	333	.name = KBUILD_MODNAME,
62e00cb9 AH	334	},
	335	.probe = hid_time_probe,
	336	.remove = hid_time_remove,
	337	};
	338	module_platform_driver(hid_time_platform_driver);
	339
	340	MODULE_DESCRIPTION("HID Sensor Time");
	341	MODULE_AUTHOR("Alexander Holler <holler@ahsoftware.de>");
	342	MODULE_LICENSE("GPL");