![Alexander Holler](/assets/img/avatar_default.png)
There is no real reason to not support 16 or 32 bit values too. Signed-off-by: Alexander Holler <holler@ahsoftware.de> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Lars-Peter Clausen <lars@metafoo.de> Cc: Jonathan Cameron <jic23@cam.ac.uk> Cc: Jiri Kosina <jkosina@suse.cz> Cc: John Stultz <john.stultz@linaro.org> Cc: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
316 lines
9 KiB
C
316 lines
9 KiB
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>
|
|
|
|
/* Format: HID-SENSOR-usage_id_in_hex */
|
|
/* Usage ID from spec for Time: 0x2000A0 */
|
|
#define DRIVER_NAME "HID-SENSOR-2000a0" /* must be lowercase */
|
|
|
|
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;
|
|
|
|
INIT_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);
|
|
/* 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 = pdev->dev.platform_data;
|
|
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;
|
|
}
|
|
|
|
time_state->rtc = devm_rtc_device_register(&pdev->dev,
|
|
"hid-sensor-time", &hid_time_rtc_ops,
|
|
THIS_MODULE);
|
|
|
|
if (IS_ERR(time_state->rtc)) {
|
|
dev_err(&pdev->dev, "rtc device register failed!\n");
|
|
return PTR_ERR(time_state->rtc);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int hid_time_remove(struct platform_device *pdev)
|
|
{
|
|
struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
|
|
|
|
sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_TIME);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver hid_time_platform_driver = {
|
|
.driver = {
|
|
.name = DRIVER_NAME,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.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");
|