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
|
/*
* Copyright (c) 2006-2022, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2022-3-08 GuEe-GUI the first version
*/
#include <rtthread.h>
#include <rtdevice.h>
#define DBG_TAG "input.js.adc"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
struct adc_joystick_axis
{
rt_uint32_t code;
rt_uint32_t range[2];
rt_uint32_t fuzz;
rt_uint32_t flat;
rt_uint32_t channel;
rt_uint32_t inverted;
struct rt_adc_device *adc_dev;
};
struct adc_joysticks
{
struct rt_input_device parent;
rt_uint32_t num_axis;
struct adc_joystick_axis axis[];
};
static void adc_joysticks_poll(struct rt_input_device *idev)
{
int value;
struct adc_joysticks *aj = rt_container_of(idev, struct adc_joysticks, parent);
for (int i = 0; i < aj->num_axis; ++i)
{
struct adc_joystick_axis *axis = &aj->axis[i];
value = rt_adc_read(axis->adc_dev, axis->channel);
if (value < 0)
{
return;
}
if (axis->inverted)
{
value = (int)(axis->range[0] + axis->range[1]) - value;
}
rt_input_report_abs(&aj->parent, axis->code, value);
}
rt_input_sync(&aj->parent);
}
static rt_err_t adc_joystick_probe(struct rt_platform_device *pdev)
{
rt_err_t err;
rt_uint32_t interval;
rt_uint32_t num_axis;
struct adc_joysticks *aj;
struct adc_joystick_axis *axis;
struct rt_device *dev = &pdev->parent;
struct rt_ofw_node *np = dev->ofw_node, *axis_np;
num_axis = rt_ofw_get_child_count(np);
if (!num_axis)
{
LOG_E("Keymap is missing");
return -RT_EINVAL;
}
aj = rt_calloc(1, sizeof(*aj) + sizeof(struct adc_joystick_axis) * num_axis);
if (!aj)
{
return -RT_ENOMEM;
}
rt_ofw_foreach_child_node(np, axis_np)
{
rt_uint32_t reg;
const char *propname;
if (rt_ofw_prop_read_u32(axis_np, "reg", ®))
{
err = -RT_EINVAL;
rt_ofw_node_put(axis_np);
goto _fail;
}
if (reg >= num_axis)
{
LOG_E("%s: reg %u out of range (num_axis %u)",
rt_ofw_node_full_name(axis_np), reg, num_axis);
rt_ofw_node_put(axis_np);
err = -RT_EINVAL;
goto _fail;
}
axis = &aj->axis[reg];
if (axis->adc_dev)
{
LOG_E("%s: duplicate reg %u", rt_ofw_node_full_name(axis_np), reg);
rt_ofw_node_put(axis_np);
err = -RT_EINVAL;
goto _fail;
}
axis->adc_dev = rt_iio_channel_get_by_index(dev, reg, &axis->channel);
if (!axis->adc_dev)
{
rt_ofw_node_put(axis_np);
LOG_E("ADC device not found");
err = -RT_EINVAL;
goto _fail;
}
if (rt_ofw_prop_read_u32(axis_np, "abs-flat", &axis->flat))
{
axis->flat = 0;
}
if (rt_ofw_prop_read_u32(axis_np, "abs-fuzz", &axis->fuzz))
{
axis->fuzz = 0;
}
if (rt_ofw_prop_read_u32_array_index(axis_np, "abs-range", 0, 2, axis->range))
{
LOG_E("%s: Axis[%d] missing %s", rt_ofw_node_full_name(axis_np), reg, "abs-range");
rt_ofw_node_put(axis_np);
err = -RT_EINVAL;
goto _fail;
}
axis->inverted = 0;
if (axis->range[0] > axis->range[1])
{
rt_uint32_t t = axis->range[0];
axis->range[0] = axis->range[1];
axis->range[1] = t;
axis->inverted = 1;
}
if (!(propname = rt_ofw_get_prop_fuzzy_name(axis_np, ",code$")) ||
rt_ofw_prop_read_u32(axis_np, propname, &axis->code))
{
LOG_E("%s: Axis[%d] missing %s", rt_ofw_node_full_name(axis_np), reg, "*,code");
rt_ofw_node_put(axis_np);
err = -RT_EINVAL;
goto _fail;
}
rt_input_set_absinfo(&aj->parent, axis->code,
axis->range[0], axis->range[1], axis->fuzz, axis->flat);
rt_input_set_capability(&aj->parent, EV_ABS, axis->code);
}
for (int i = 0; i < num_axis; ++i)
{
if (!aj->axis[i].adc_dev)
{
LOG_E("Axis[%d] is missing", i);
err = -RT_EINVAL;
goto _fail;
}
}
aj->num_axis = num_axis;
if (rt_ofw_prop_read_u32(np, "poll-interval", &interval))
{
interval = 200;
}
if ((err = rt_input_setup_polling(&aj->parent, adc_joysticks_poll)))
{
goto _fail;
}
rt_input_set_poll_interval(&aj->parent, interval);
if ((err = rt_input_device_register(&aj->parent)))
{
goto _fail;
}
dev->user_data = aj;
return RT_EOK;
_fail:
rt_input_remove_config(&aj->parent);
rt_free(aj);
return err;
}
static rt_err_t adc_joystick_remove(struct rt_platform_device *pdev)
{
struct adc_joysticks *aj = pdev->parent.user_data;
pdev->parent.user_data = RT_NULL;
rt_input_device_unregister(&aj->parent);
rt_free(aj);
return RT_EOK;
}
static const struct rt_ofw_node_id adc_joystick_ofw_ids[] = {
{ .compatible = "adc-joystick" },
{ /* sentinel */ }
};
static struct rt_platform_driver adc_joystick_driver = {
.name = "adc-joystick",
.ids = adc_joystick_ofw_ids,
.probe = adc_joystick_probe,
.remove = adc_joystick_remove,
};
RT_PLATFORM_DRIVER_EXPORT(adc_joystick_driver);
|
