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62e00cb9 AH |
1 | /* |
2 | * HID Sensor Time Driver | |
3 | * Copyright (c) 2012, Alexander Holler. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms and conditions of the GNU General Public License, | |
7 | * version 2, as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
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 | /* Format: HID-SENSOR-usage_id_in_hex */ | |
27 | /* Usage ID from spec for Time: 0x2000A0 */ | |
28 | #define DRIVER_NAME "HID-SENSOR-2000a0" /* must be lowercase */ | |
29 | ||
30 | enum 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 | ||
40 | struct hid_time_state { | |
41 | struct hid_sensor_hub_callbacks callbacks; | |
e07c6d17 | 42 | struct hid_sensor_common common_attributes; |
62e00cb9 AH |
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 | ||
51 | static 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 | /* Channel names for verbose error messages */ | |
61 | static const char * const hid_time_channel_names[TIME_RTC_CHANNEL_MAX] = { | |
62 | "year", "month", "day", "hour", "minute", "second", | |
63 | }; | |
64 | ||
65 | /* Callback handler to send event after all samples are received and captured */ | |
66 | static 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 | ||
79 | static 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 | /* assume we are in 1970...2069 */ | |
91 | time_buf->tm_year += 100; | |
92 | break; | |
93 | case HID_USAGE_SENSOR_TIME_MONTH: | |
94 | /* sensor sending the month as 1-12, we need 0-11 */ | |
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 | /* small helper, haven't found any other way */ | |
116 | static 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; /* should never happen */ | |
126 | } | |
127 | ||
128 | static 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 | /* Check the (needed) attributes for sanity */ | |
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 | /* allow attribute seconds with unit seconds */ | |
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 | ||
185 | static 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 | /* get a report with all values through requesting one value */ | |
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); | |
197 | /* wait for all values (event) */ | |
198 | ret = wait_for_completion_killable_timeout( | |
199 | &time_state->comp_last_time, HZ*6); | |
200 | if (ret > 0) { | |
201 | /* no error */ | |
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; /* timeouted */ | |
209 | return ret; /* killed (-ERESTARTSYS) */ | |
210 | } | |
211 | ||
212 | static const struct rtc_class_ops hid_time_rtc_ops = { | |
213 | .read_time = hid_rtc_read_time, | |
214 | }; | |
215 | ||
216 | static 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 | ||
b775dce9 | 228 | spin_lock_init(&time_state->lock_last_time); |
62e00cb9 AH |
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 = rtc_device_register("hid-sensor-time", | |
259 | &pdev->dev, &hid_time_rtc_ops, THIS_MODULE); | |
260 | ||
261 | if (IS_ERR(time_state->rtc)) { | |
262 | dev_err(&pdev->dev, "rtc device register failed!\n"); | |
263 | return PTR_ERR(time_state->rtc); | |
264 | } | |
265 | ||
266 | return ret; | |
267 | } | |
268 | ||
269 | static int hid_time_remove(struct platform_device *pdev) | |
270 | { | |
271 | struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; | |
272 | struct hid_time_state *time_state = platform_get_drvdata(pdev); | |
273 | ||
274 | rtc_device_unregister(time_state->rtc); | |
275 | sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_TIME); | |
276 | ||
277 | return 0; | |
278 | } | |
279 | ||
280 | static struct platform_driver hid_time_platform_driver = { | |
281 | .driver = { | |
282 | .name = DRIVER_NAME, | |
283 | .owner = THIS_MODULE, | |
284 | }, | |
285 | .probe = hid_time_probe, | |
286 | .remove = hid_time_remove, | |
287 | }; | |
288 | module_platform_driver(hid_time_platform_driver); | |
289 | ||
290 | MODULE_DESCRIPTION("HID Sensor Time"); | |
291 | MODULE_AUTHOR("Alexander Holler <holler@ahsoftware.de>"); | |
292 | MODULE_LICENSE("GPL"); |