292 lines
8.3 KiB
C
292 lines
8.3 KiB
C
/*
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* HID Sensor Time Driver
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* Copyright (c) 2012, Alexander Holler.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <linux/hid-sensor-hub.h>
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#include <linux/iio/iio.h>
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#include <linux/rtc.h>
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/* Format: HID-SENSOR-usage_id_in_hex */
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/* Usage ID from spec for Time: 0x2000A0 */
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#define DRIVER_NAME "HID-SENSOR-2000a0" /* must be lowercase */
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enum hid_time_channel {
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CHANNEL_SCAN_INDEX_YEAR,
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CHANNEL_SCAN_INDEX_MONTH,
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CHANNEL_SCAN_INDEX_DAY,
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CHANNEL_SCAN_INDEX_HOUR,
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CHANNEL_SCAN_INDEX_MINUTE,
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CHANNEL_SCAN_INDEX_SECOND,
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TIME_RTC_CHANNEL_MAX,
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};
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struct hid_time_state {
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struct hid_sensor_hub_callbacks callbacks;
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struct hid_sensor_common common_attributes;
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struct hid_sensor_hub_attribute_info info[TIME_RTC_CHANNEL_MAX];
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struct rtc_time last_time;
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spinlock_t lock_last_time;
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struct completion comp_last_time;
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struct rtc_time time_buf;
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struct rtc_device *rtc;
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};
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static const u32 hid_time_addresses[TIME_RTC_CHANNEL_MAX] = {
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HID_USAGE_SENSOR_TIME_YEAR,
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HID_USAGE_SENSOR_TIME_MONTH,
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HID_USAGE_SENSOR_TIME_DAY,
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HID_USAGE_SENSOR_TIME_HOUR,
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HID_USAGE_SENSOR_TIME_MINUTE,
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HID_USAGE_SENSOR_TIME_SECOND,
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};
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/* Channel names for verbose error messages */
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static const char * const hid_time_channel_names[TIME_RTC_CHANNEL_MAX] = {
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"year", "month", "day", "hour", "minute", "second",
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};
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/* Callback handler to send event after all samples are received and captured */
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static int hid_time_proc_event(struct hid_sensor_hub_device *hsdev,
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unsigned usage_id, void *priv)
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{
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unsigned long flags;
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struct hid_time_state *time_state = platform_get_drvdata(priv);
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spin_lock_irqsave(&time_state->lock_last_time, flags);
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time_state->last_time = time_state->time_buf;
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spin_unlock_irqrestore(&time_state->lock_last_time, flags);
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complete(&time_state->comp_last_time);
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return 0;
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}
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static int hid_time_capture_sample(struct hid_sensor_hub_device *hsdev,
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unsigned usage_id, size_t raw_len,
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char *raw_data, void *priv)
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{
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struct hid_time_state *time_state = platform_get_drvdata(priv);
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struct rtc_time *time_buf = &time_state->time_buf;
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switch (usage_id) {
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case HID_USAGE_SENSOR_TIME_YEAR:
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time_buf->tm_year = *(u8 *)raw_data;
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if (time_buf->tm_year < 70)
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/* assume we are in 1970...2069 */
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time_buf->tm_year += 100;
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break;
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case HID_USAGE_SENSOR_TIME_MONTH:
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/* sensor sending the month as 1-12, we need 0-11 */
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time_buf->tm_mon = *(u8 *)raw_data-1;
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break;
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case HID_USAGE_SENSOR_TIME_DAY:
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time_buf->tm_mday = *(u8 *)raw_data;
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break;
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case HID_USAGE_SENSOR_TIME_HOUR:
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time_buf->tm_hour = *(u8 *)raw_data;
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break;
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case HID_USAGE_SENSOR_TIME_MINUTE:
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time_buf->tm_min = *(u8 *)raw_data;
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break;
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case HID_USAGE_SENSOR_TIME_SECOND:
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time_buf->tm_sec = *(u8 *)raw_data;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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/* small helper, haven't found any other way */
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static const char *hid_time_attrib_name(u32 attrib_id)
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{
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static const char unknown[] = "unknown";
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unsigned i;
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for (i = 0; i < TIME_RTC_CHANNEL_MAX; ++i) {
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if (hid_time_addresses[i] == attrib_id)
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return hid_time_channel_names[i];
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}
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return unknown; /* should never happen */
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}
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static int hid_time_parse_report(struct platform_device *pdev,
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struct hid_sensor_hub_device *hsdev,
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unsigned usage_id,
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struct hid_time_state *time_state)
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{
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int report_id, i;
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for (i = 0; i < TIME_RTC_CHANNEL_MAX; ++i)
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if (sensor_hub_input_get_attribute_info(hsdev,
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HID_INPUT_REPORT, usage_id,
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hid_time_addresses[i],
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&time_state->info[i]) < 0)
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return -EINVAL;
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/* Check the (needed) attributes for sanity */
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report_id = time_state->info[0].report_id;
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if (report_id < 0) {
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dev_err(&pdev->dev, "bad report ID!\n");
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return -EINVAL;
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}
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for (i = 0; i < TIME_RTC_CHANNEL_MAX; ++i) {
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if (time_state->info[i].report_id != report_id) {
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dev_err(&pdev->dev,
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"not all needed attributes inside the same report!\n");
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return -EINVAL;
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}
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if (time_state->info[i].size != 1) {
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dev_err(&pdev->dev,
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"attribute '%s' not 8 bits wide!\n",
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hid_time_attrib_name(
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time_state->info[i].attrib_id));
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return -EINVAL;
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}
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if (time_state->info[i].units !=
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HID_USAGE_SENSOR_UNITS_NOT_SPECIFIED &&
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/* allow attribute seconds with unit seconds */
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!(time_state->info[i].attrib_id ==
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HID_USAGE_SENSOR_TIME_SECOND &&
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time_state->info[i].units ==
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HID_USAGE_SENSOR_UNITS_SECOND)) {
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dev_err(&pdev->dev,
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"attribute '%s' hasn't a unit of type 'none'!\n",
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hid_time_attrib_name(
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time_state->info[i].attrib_id));
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return -EINVAL;
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}
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if (time_state->info[i].unit_expo) {
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dev_err(&pdev->dev,
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"attribute '%s' hasn't a unit exponent of 1!\n",
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hid_time_attrib_name(
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time_state->info[i].attrib_id));
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return -EINVAL;
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}
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}
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return 0;
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}
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static int hid_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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unsigned long flags;
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struct hid_time_state *time_state =
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platform_get_drvdata(to_platform_device(dev));
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int ret;
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INIT_COMPLETION(time_state->comp_last_time);
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/* get a report with all values through requesting one value */
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sensor_hub_input_attr_get_raw_value(time_state->common_attributes.hsdev,
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HID_USAGE_SENSOR_TIME, hid_time_addresses[0],
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time_state->info[0].report_id);
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/* wait for all values (event) */
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ret = wait_for_completion_killable_timeout(
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&time_state->comp_last_time, HZ*6);
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if (ret > 0) {
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/* no error */
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spin_lock_irqsave(&time_state->lock_last_time, flags);
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*tm = time_state->last_time;
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spin_unlock_irqrestore(&time_state->lock_last_time, flags);
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return 0;
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}
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if (!ret)
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return -EIO; /* timeouted */
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return ret; /* killed (-ERESTARTSYS) */
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}
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static const struct rtc_class_ops hid_time_rtc_ops = {
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.read_time = hid_rtc_read_time,
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};
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static int hid_time_probe(struct platform_device *pdev)
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{
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int ret = 0;
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struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
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struct hid_time_state *time_state = devm_kzalloc(&pdev->dev,
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sizeof(struct hid_time_state), GFP_KERNEL);
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if (time_state == NULL)
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return -ENOMEM;
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platform_set_drvdata(pdev, time_state);
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spin_lock_init(&time_state->lock_last_time);
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init_completion(&time_state->comp_last_time);
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time_state->common_attributes.hsdev = hsdev;
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time_state->common_attributes.pdev = pdev;
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ret = hid_sensor_parse_common_attributes(hsdev,
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HID_USAGE_SENSOR_TIME,
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&time_state->common_attributes);
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if (ret) {
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dev_err(&pdev->dev, "failed to setup common attributes!\n");
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return ret;
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}
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ret = hid_time_parse_report(pdev, hsdev, HID_USAGE_SENSOR_TIME,
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time_state);
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if (ret) {
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dev_err(&pdev->dev, "failed to setup attributes!\n");
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return ret;
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}
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time_state->callbacks.send_event = hid_time_proc_event;
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time_state->callbacks.capture_sample = hid_time_capture_sample;
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time_state->callbacks.pdev = pdev;
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ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_TIME,
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&time_state->callbacks);
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if (ret < 0) {
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dev_err(&pdev->dev, "register callback failed!\n");
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return ret;
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}
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time_state->rtc = devm_rtc_device_register(&pdev->dev,
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"hid-sensor-time", &hid_time_rtc_ops,
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THIS_MODULE);
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if (IS_ERR(time_state->rtc)) {
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dev_err(&pdev->dev, "rtc device register failed!\n");
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return PTR_ERR(time_state->rtc);
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}
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return ret;
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}
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static int hid_time_remove(struct platform_device *pdev)
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{
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struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
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sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_TIME);
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return 0;
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}
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static struct platform_driver hid_time_platform_driver = {
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.driver = {
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.name = DRIVER_NAME,
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.owner = THIS_MODULE,
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},
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.probe = hid_time_probe,
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.remove = hid_time_remove,
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};
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module_platform_driver(hid_time_platform_driver);
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MODULE_DESCRIPTION("HID Sensor Time");
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MODULE_AUTHOR("Alexander Holler <holler@ahsoftware.de>");
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MODULE_LICENSE("GPL");
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