/* * 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");