1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
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
26
27
28#define DRIVER_NAME "HID-SENSOR-2000a0"
29
30enum hid_time_channel {
31 CHANNEL_SCAN_INDEX_YEAR,
32 CHANNEL_SCAN_INDEX_MONTH,
33 CHANNEL_SCAN_INDEX_DAY,
34 CHANNEL_SCAN_INDEX_HOUR,
35 CHANNEL_SCAN_INDEX_MINUTE,
36 CHANNEL_SCAN_INDEX_SECOND,
37 TIME_RTC_CHANNEL_MAX,
38};
39
40struct hid_time_state {
41 struct hid_sensor_hub_callbacks callbacks;
42 struct hid_sensor_common common_attributes;
43 struct hid_sensor_hub_attribute_info info[TIME_RTC_CHANNEL_MAX];
44 struct rtc_time last_time;
45 spinlock_t lock_last_time;
46 struct completion comp_last_time;
47 struct rtc_time time_buf;
48 struct rtc_device *rtc;
49};
50
51static const u32 hid_time_addresses[TIME_RTC_CHANNEL_MAX] = {
52 HID_USAGE_SENSOR_TIME_YEAR,
53 HID_USAGE_SENSOR_TIME_MONTH,
54 HID_USAGE_SENSOR_TIME_DAY,
55 HID_USAGE_SENSOR_TIME_HOUR,
56 HID_USAGE_SENSOR_TIME_MINUTE,
57 HID_USAGE_SENSOR_TIME_SECOND,
58};
59
60
61static const char * const hid_time_channel_names[TIME_RTC_CHANNEL_MAX] = {
62 "year", "month", "day", "hour", "minute", "second",
63};
64
65
66static int hid_time_proc_event(struct hid_sensor_hub_device *hsdev,
67 unsigned usage_id, void *priv)
68{
69 unsigned long flags;
70 struct hid_time_state *time_state = platform_get_drvdata(priv);
71
72 spin_lock_irqsave(&time_state->lock_last_time, flags);
73 time_state->last_time = time_state->time_buf;
74 spin_unlock_irqrestore(&time_state->lock_last_time, flags);
75 complete(&time_state->comp_last_time);
76 return 0;
77}
78
79static int hid_time_capture_sample(struct hid_sensor_hub_device *hsdev,
80 unsigned usage_id, size_t raw_len,
81 char *raw_data, void *priv)
82{
83 struct hid_time_state *time_state = platform_get_drvdata(priv);
84 struct rtc_time *time_buf = &time_state->time_buf;
85
86 switch (usage_id) {
87 case HID_USAGE_SENSOR_TIME_YEAR:
88 time_buf->tm_year = *(u8 *)raw_data;
89 if (time_buf->tm_year < 70)
90
91 time_buf->tm_year += 100;
92 break;
93 case HID_USAGE_SENSOR_TIME_MONTH:
94
95 time_buf->tm_mon = *(u8 *)raw_data-1;
96 break;
97 case HID_USAGE_SENSOR_TIME_DAY:
98 time_buf->tm_mday = *(u8 *)raw_data;
99 break;
100 case HID_USAGE_SENSOR_TIME_HOUR:
101 time_buf->tm_hour = *(u8 *)raw_data;
102 break;
103 case HID_USAGE_SENSOR_TIME_MINUTE:
104 time_buf->tm_min = *(u8 *)raw_data;
105 break;
106 case HID_USAGE_SENSOR_TIME_SECOND:
107 time_buf->tm_sec = *(u8 *)raw_data;
108 break;
109 default:
110 return -EINVAL;
111 }
112 return 0;
113}
114
115
116static const char *hid_time_attrib_name(u32 attrib_id)
117{
118 static const char unknown[] = "unknown";
119 unsigned i;
120
121 for (i = 0; i < TIME_RTC_CHANNEL_MAX; ++i) {
122 if (hid_time_addresses[i] == attrib_id)
123 return hid_time_channel_names[i];
124 }
125 return unknown;
126}
127
128static int hid_time_parse_report(struct platform_device *pdev,
129 struct hid_sensor_hub_device *hsdev,
130 unsigned usage_id,
131 struct hid_time_state *time_state)
132{
133 int report_id, i;
134
135 for (i = 0; i < TIME_RTC_CHANNEL_MAX; ++i)
136 if (sensor_hub_input_get_attribute_info(hsdev,
137 HID_INPUT_REPORT, usage_id,
138 hid_time_addresses[i],
139 &time_state->info[i]) < 0)
140 return -EINVAL;
141
142 report_id = time_state->info[0].report_id;
143 if (report_id < 0) {
144 dev_err(&pdev->dev, "bad report ID!\n");
145 return -EINVAL;
146 }
147 for (i = 0; i < TIME_RTC_CHANNEL_MAX; ++i) {
148 if (time_state->info[i].report_id != report_id) {
149 dev_err(&pdev->dev,
150 "not all needed attributes inside the same report!\n");
151 return -EINVAL;
152 }
153 if (time_state->info[i].size != 1) {
154 dev_err(&pdev->dev,
155 "attribute '%s' not 8 bits wide!\n",
156 hid_time_attrib_name(
157 time_state->info[i].attrib_id));
158 return -EINVAL;
159 }
160 if (time_state->info[i].units !=
161 HID_USAGE_SENSOR_UNITS_NOT_SPECIFIED &&
162
163 !(time_state->info[i].attrib_id ==
164 HID_USAGE_SENSOR_TIME_SECOND &&
165 time_state->info[i].units ==
166 HID_USAGE_SENSOR_UNITS_SECOND)) {
167 dev_err(&pdev->dev,
168 "attribute '%s' hasn't a unit of type 'none'!\n",
169 hid_time_attrib_name(
170 time_state->info[i].attrib_id));
171 return -EINVAL;
172 }
173 if (time_state->info[i].unit_expo) {
174 dev_err(&pdev->dev,
175 "attribute '%s' hasn't a unit exponent of 1!\n",
176 hid_time_attrib_name(
177 time_state->info[i].attrib_id));
178 return -EINVAL;
179 }
180 }
181
182 return 0;
183}
184
185static int hid_rtc_read_time(struct device *dev, struct rtc_time *tm)
186{
187 unsigned long flags;
188 struct hid_time_state *time_state =
189 platform_get_drvdata(to_platform_device(dev));
190 int ret;
191
192 INIT_COMPLETION(time_state->comp_last_time);
193
194 sensor_hub_input_attr_get_raw_value(time_state->common_attributes.hsdev,
195 HID_USAGE_SENSOR_TIME, hid_time_addresses[0],
196 time_state->info[0].report_id, SENSOR_HUB_SYNC);
197
198 ret = wait_for_completion_killable_timeout(
199 &time_state->comp_last_time, HZ*6);
200 if (ret > 0) {
201
202 spin_lock_irqsave(&time_state->lock_last_time, flags);
203 *tm = time_state->last_time;
204 spin_unlock_irqrestore(&time_state->lock_last_time, flags);
205 return 0;
206 }
207 if (!ret)
208 return -EIO;
209 return ret;
210}
211
212static const struct rtc_class_ops hid_time_rtc_ops = {
213 .read_time = hid_rtc_read_time,
214};
215
216static int hid_time_probe(struct platform_device *pdev)
217{
218 int ret = 0;
219 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
220 struct hid_time_state *time_state = devm_kzalloc(&pdev->dev,
221 sizeof(struct hid_time_state), GFP_KERNEL);
222
223 if (time_state == NULL)
224 return -ENOMEM;
225
226 platform_set_drvdata(pdev, time_state);
227
228 spin_lock_init(&time_state->lock_last_time);
229 init_completion(&time_state->comp_last_time);
230 time_state->common_attributes.hsdev = hsdev;
231 time_state->common_attributes.pdev = pdev;
232
233 ret = hid_sensor_parse_common_attributes(hsdev,
234 HID_USAGE_SENSOR_TIME,
235 &time_state->common_attributes);
236 if (ret) {
237 dev_err(&pdev->dev, "failed to setup common attributes!\n");
238 return ret;
239 }
240
241 ret = hid_time_parse_report(pdev, hsdev, HID_USAGE_SENSOR_TIME,
242 time_state);
243 if (ret) {
244 dev_err(&pdev->dev, "failed to setup attributes!\n");
245 return ret;
246 }
247
248 time_state->callbacks.send_event = hid_time_proc_event;
249 time_state->callbacks.capture_sample = hid_time_capture_sample;
250 time_state->callbacks.pdev = pdev;
251 ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_TIME,
252 &time_state->callbacks);
253 if (ret < 0) {
254 dev_err(&pdev->dev, "register callback failed!\n");
255 return ret;
256 }
257
258 time_state->rtc = devm_rtc_device_register(&pdev->dev,
259 "hid-sensor-time", &hid_time_rtc_ops,
260 THIS_MODULE);
261
262 if (IS_ERR(time_state->rtc)) {
263 dev_err(&pdev->dev, "rtc device register failed!\n");
264 return PTR_ERR(time_state->rtc);
265 }
266
267 return ret;
268}
269
270static int hid_time_remove(struct platform_device *pdev)
271{
272 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
273
274 sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_TIME);
275
276 return 0;
277}
278
279static struct platform_driver hid_time_platform_driver = {
280 .driver = {
281 .name = DRIVER_NAME,
282 .owner = THIS_MODULE,
283 },
284 .probe = hid_time_probe,
285 .remove = hid_time_remove,
286};
287module_platform_driver(hid_time_platform_driver);
288
289MODULE_DESCRIPTION("HID Sensor Time");
290MODULE_AUTHOR("Alexander Holler <holler@ahsoftware.de>");
291MODULE_LICENSE("GPL");
292
