1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
|
/*
* ThingM blink(1) USB RGB LED driver
*
* Copyright 2013 Savoir-faire Linux Inc.
* Vivien Didelot <vivien.didelot@savoirfairelinux.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, version 2.
*/
#include <linux/hid.h>
#include <linux/leds.h>
#include <linux/module.h>
#include "hid-ids.h"
#define BLINK1_CMD_SIZE 9
#define blink1_rgb_to_r(rgb) ((rgb & 0xFF0000) >> 16)
#define blink1_rgb_to_g(rgb) ((rgb & 0x00FF00) >> 8)
#define blink1_rgb_to_b(rgb) ((rgb & 0x0000FF) >> 0)
/**
* struct blink1_data - blink(1) device specific data
* @hdev: HID device.
* @led_cdev: LED class instance.
* @rgb: 8-bit per channel RGB notation.
* @fade: fade time in hundredths of a second.
* @brightness: brightness coefficient.
* @play: play/pause in-memory patterns.
*/
struct blink1_data {
struct hid_device *hdev;
struct led_classdev led_cdev;
u32 rgb;
u16 fade;
u8 brightness;
bool play;
};
static int blink1_send_command(struct blink1_data *data,
u8 buf[BLINK1_CMD_SIZE])
{
int ret;
hid_dbg(data->hdev, "command: %d%c%.2x%.2x%.2x%.2x%.2x%.2x%.2x\n",
buf[0], buf[1], buf[2], buf[3], buf[4],
buf[5], buf[6], buf[7], buf[8]);
ret = data->hdev->hid_output_raw_report(data->hdev, buf,
BLINK1_CMD_SIZE, HID_FEATURE_REPORT);
return ret < 0 ? ret : 0;
}
static int blink1_update_color(struct blink1_data *data)
{
u8 buf[BLINK1_CMD_SIZE] = { 1, 'n', 0, 0, 0, 0, 0, 0, 0 };
if (data->brightness) {
unsigned int coef = DIV_ROUND_CLOSEST(255, data->brightness);
buf[2] = DIV_ROUND_CLOSEST(blink1_rgb_to_r(data->rgb), coef);
buf[3] = DIV_ROUND_CLOSEST(blink1_rgb_to_g(data->rgb), coef);
buf[4] = DIV_ROUND_CLOSEST(blink1_rgb_to_b(data->rgb), coef);
}
if (data->fade) {
buf[1] = 'c';
buf[5] = (data->fade & 0xFF00) >> 8;
buf[6] = (data->fade & 0x00FF);
}
return blink1_send_command(data, buf);
}
static void blink1_led_set(struct led_classdev *led_cdev,
enum led_brightness brightness)
{
struct blink1_data *data = dev_get_drvdata(led_cdev->dev->parent);
data->brightness = brightness;
if (blink1_update_color(data))
hid_err(data->hdev, "failed to update color\n");
}
static enum led_brightness blink1_led_get(struct led_classdev *led_cdev)
{
struct blink1_data *data = dev_get_drvdata(led_cdev->dev->parent);
return data->brightness;
}
static ssize_t blink1_show_rgb(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct blink1_data *data = dev_get_drvdata(dev->parent);
return sprintf(buf, "%.6X\n", data->rgb);
}
static ssize_t blink1_store_rgb(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
struct blink1_data *data = dev_get_drvdata(dev->parent);
long unsigned int rgb;
int ret;
ret = kstrtoul(buf, 16, &rgb);
if (ret)
return ret;
/* RGB triplet notation is 24-bit hexadecimal */
if (rgb > 0xFFFFFF)
return -EINVAL;
data->rgb = rgb;
ret = blink1_update_color(data);
return ret ? ret : count;
}
static DEVICE_ATTR(rgb, S_IRUGO | S_IWUSR, blink1_show_rgb, blink1_store_rgb);
static ssize_t blink1_show_fade(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct blink1_data *data = dev_get_drvdata(dev->parent);
return sprintf(buf, "%d\n", data->fade * 10);
}
static ssize_t blink1_store_fade(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
struct blink1_data *data = dev_get_drvdata(dev->parent);
long unsigned int fade;
int ret;
ret = kstrtoul(buf, 10, &fade);
if (ret)
return ret;
/* blink(1) accepts 16-bit fade time, number of 10ms ticks */
fade = DIV_ROUND_CLOSEST(fade, 10);
if (fade > 65535)
return -EINVAL;
data->fade = fade;
return count;
}
static DEVICE_ATTR(fade, S_IRUGO | S_IWUSR,
blink1_show_fade, blink1_store_fade);
static ssize_t blink1_show_play(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct blink1_data *data = dev_get_drvdata(dev->parent);
return sprintf(buf, "%d\n", data->play);
}
static ssize_t blink1_store_play(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
struct blink1_data *data = dev_get_drvdata(dev->parent);
u8 cmd[BLINK1_CMD_SIZE] = { 1, 'p', 0, 0, 0, 0, 0, 0, 0 };
long unsigned int play;
int ret;
ret = kstrtoul(buf, 10, &play);
if (ret)
return ret;
data->play = !!play;
cmd[2] = data->play;
ret = blink1_send_command(data, cmd);
return ret ? ret : count;
}
static DEVICE_ATTR(play, S_IRUGO | S_IWUSR,
blink1_show_play, blink1_store_play);
static const struct attribute_group blink1_sysfs_group = {
.attrs = (struct attribute *[]) {
&dev_attr_rgb.attr,
&dev_attr_fade.attr,
&dev_attr_play.attr,
NULL
},
};
static int thingm_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
struct blink1_data *data;
struct led_classdev *led;
char led_name[13];
int ret;
data = devm_kzalloc(&hdev->dev, sizeof(struct blink1_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
hid_set_drvdata(hdev, data);
data->hdev = hdev;
data->rgb = 0xFFFFFF; /* set a default white color */
ret = hid_parse(hdev);
if (ret)
goto error;
ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW);
if (ret)
goto error;
/* blink(1) serial numbers range is 0x1A001000 to 0x1A002FFF */
led = &data->led_cdev;
snprintf(led_name, sizeof(led_name), "blink1::%s", hdev->uniq + 4);
led->name = led_name;
led->brightness_set = blink1_led_set;
led->brightness_get = blink1_led_get;
ret = led_classdev_register(&hdev->dev, led);
if (ret)
goto stop;
ret = sysfs_create_group(&led->dev->kobj, &blink1_sysfs_group);
if (ret)
goto remove_led;
return 0;
remove_led:
led_classdev_unregister(led);
stop:
hid_hw_stop(hdev);
error:
return ret;
}
static void thingm_remove(struct hid_device *hdev)
{
struct blink1_data *data = hid_get_drvdata(hdev);
struct led_classdev *led = &data->led_cdev;
sysfs_remove_group(&led->dev->kobj, &blink1_sysfs_group);
led_classdev_unregister(led);
hid_hw_stop(hdev);
}
static const struct hid_device_id thingm_table[] = {
{ HID_USB_DEVICE(USB_VENDOR_ID_THINGM, USB_DEVICE_ID_BLINK1) },
{ }
};
MODULE_DEVICE_TABLE(hid, thingm_table);
static struct hid_driver thingm_driver = {
.name = "thingm",
.probe = thingm_probe,
.remove = thingm_remove,
.id_table = thingm_table,
};
module_hid_driver(thingm_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Vivien Didelot <vivien.didelot@savoirfairelinux.com>");
MODULE_DESCRIPTION("ThingM blink(1) USB RGB LED driver");
|
