--- /dev/null
+/*
+ * 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_iio_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 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:
+ time_buf->tm_year = *(u8 *)raw_data;
+ if (time_buf->tm_year < 70)
+ /* assume we are in 1970...2069 */
+ time_buf->tm_year += 100;
+ break;
+ case HID_USAGE_SENSOR_TIME_MONTH:
+ /* sensor sending the month as 1-12, we need 0-11 */
+ time_buf->tm_mon = *(u8 *)raw_data-1;
+ break;
+ case HID_USAGE_SENSOR_TIME_DAY:
+ time_buf->tm_mday = *(u8 *)raw_data;
+ break;
+ case HID_USAGE_SENSOR_TIME_HOUR:
+ time_buf->tm_hour = *(u8 *)raw_data;
+ break;
+ case HID_USAGE_SENSOR_TIME_MINUTE:
+ time_buf->tm_min = *(u8 *)raw_data;
+ break;
+ case HID_USAGE_SENSOR_TIME_SECOND:
+ time_buf->tm_sec = *(u8 *)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 != 1) {
+ dev_err(&pdev->dev,
+ "attribute '%s' not 8 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);
+
+ 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 = rtc_device_register("hid-sensor-time",
+ &pdev->dev, &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;
+ struct hid_time_state *time_state = platform_get_drvdata(pdev);
+
+ rtc_device_unregister(time_state->rtc);
+ 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");
projects / platform / kernel / linux-rpi.git / commitdiff