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
|
/*
* Driver for Amlogic Meson IR remote receiver
*
* Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/device.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
#include <media/rc-core.h>
#define DRIVER_NAME "meson-ir"
/* valid on all Meson platforms */
#define IR_DEC_LDR_ACTIVE 0x00
#define IR_DEC_LDR_IDLE 0x04
#define IR_DEC_LDR_REPEAT 0x08
#define IR_DEC_BIT_0 0x0c
#define IR_DEC_REG0 0x10
#define IR_DEC_FRAME 0x14
#define IR_DEC_STATUS 0x18
#define IR_DEC_REG1 0x1c
/* only available on Meson 8b and newer */
#define IR_DEC_REG2 0x20
#define REG0_RATE_MASK (BIT(11) - 1)
#define DECODE_MODE_NEC 0x0
#define DECODE_MODE_RAW 0x2
/* Meson 6b uses REG1 to configure the mode */
#define REG1_MODE_MASK GENMASK(8, 7)
#define REG1_MODE_SHIFT 7
/* Meson 8b / GXBB use REG2 to configure the mode */
#define REG2_MODE_MASK GENMASK(3, 0)
#define REG2_MODE_SHIFT 0
#define REG1_TIME_IV_SHIFT 16
#define REG1_TIME_IV_MASK ((BIT(13) - 1) << REG1_TIME_IV_SHIFT)
#define REG1_IRQSEL_MASK (BIT(2) | BIT(3))
#define REG1_IRQSEL_NEC_MODE (0 << 2)
#define REG1_IRQSEL_RISE_FALL (1 << 2)
#define REG1_IRQSEL_FALL (2 << 2)
#define REG1_IRQSEL_RISE (3 << 2)
#define REG1_RESET BIT(0)
#define REG1_ENABLE BIT(15)
#define STATUS_IR_DEC_IN BIT(8)
#define MESON_TRATE 10 /* us */
struct meson_ir {
void __iomem *reg;
struct rc_dev *rc;
int irq;
spinlock_t lock;
};
static void meson_ir_set_mask(struct meson_ir *ir, unsigned int reg,
u32 mask, u32 value)
{
u32 data;
data = readl(ir->reg + reg);
data &= ~mask;
data |= (value & mask);
writel(data, ir->reg + reg);
}
static irqreturn_t meson_ir_irq(int irqno, void *dev_id)
{
struct meson_ir *ir = dev_id;
u32 duration;
DEFINE_IR_RAW_EVENT(rawir);
spin_lock(&ir->lock);
duration = readl(ir->reg + IR_DEC_REG1);
duration = (duration & REG1_TIME_IV_MASK) >> REG1_TIME_IV_SHIFT;
rawir.duration = US_TO_NS(duration * MESON_TRATE);
rawir.pulse = !!(readl(ir->reg + IR_DEC_STATUS) & STATUS_IR_DEC_IN);
ir_raw_event_store_with_filter(ir->rc, &rawir);
ir_raw_event_handle(ir->rc);
spin_unlock(&ir->lock);
return IRQ_HANDLED;
}
static int meson_ir_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *node = dev->of_node;
struct resource *res;
const char *map_name;
struct meson_ir *ir;
int ret;
ir = devm_kzalloc(dev, sizeof(struct meson_ir), GFP_KERNEL);
if (!ir)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
ir->reg = devm_ioremap_resource(dev, res);
if (IS_ERR(ir->reg)) {
dev_err(dev, "failed to map registers\n");
return PTR_ERR(ir->reg);
}
ir->irq = platform_get_irq(pdev, 0);
if (ir->irq < 0) {
dev_err(dev, "no irq resource\n");
return ir->irq;
}
ir->rc = rc_allocate_device(RC_DRIVER_IR_RAW);
if (!ir->rc) {
dev_err(dev, "failed to allocate rc device\n");
return -ENOMEM;
}
ir->rc->priv = ir;
ir->rc->input_name = DRIVER_NAME;
ir->rc->input_phys = DRIVER_NAME "/input0";
ir->rc->input_id.bustype = BUS_HOST;
map_name = of_get_property(node, "linux,rc-map-name", NULL);
ir->rc->map_name = map_name ? map_name : RC_MAP_EMPTY;
ir->rc->dev.parent = dev;
ir->rc->allowed_protocols = RC_BIT_ALL_IR_DECODER;
ir->rc->rx_resolution = US_TO_NS(MESON_TRATE);
ir->rc->timeout = MS_TO_NS(200);
ir->rc->driver_name = DRIVER_NAME;
spin_lock_init(&ir->lock);
platform_set_drvdata(pdev, ir);
ret = rc_register_device(ir->rc);
if (ret) {
dev_err(dev, "failed to register rc device\n");
goto out_free;
}
ret = devm_request_irq(dev, ir->irq, meson_ir_irq, 0, "ir-meson", ir);
if (ret) {
dev_err(dev, "failed to request irq\n");
goto out_unreg;
}
/* Reset the decoder */
meson_ir_set_mask(ir, IR_DEC_REG1, REG1_RESET, REG1_RESET);
meson_ir_set_mask(ir, IR_DEC_REG1, REG1_RESET, 0);
/* Set general operation mode (= raw/software decoding) */
if (of_device_is_compatible(node, "amlogic,meson6-ir"))
meson_ir_set_mask(ir, IR_DEC_REG1, REG1_MODE_MASK,
DECODE_MODE_RAW << REG1_MODE_SHIFT);
else
meson_ir_set_mask(ir, IR_DEC_REG2, REG2_MODE_MASK,
DECODE_MODE_RAW << REG2_MODE_SHIFT);
/* Set rate */
meson_ir_set_mask(ir, IR_DEC_REG0, REG0_RATE_MASK, MESON_TRATE - 1);
/* IRQ on rising and falling edges */
meson_ir_set_mask(ir, IR_DEC_REG1, REG1_IRQSEL_MASK,
REG1_IRQSEL_RISE_FALL);
/* Enable the decoder */
meson_ir_set_mask(ir, IR_DEC_REG1, REG1_ENABLE, REG1_ENABLE);
dev_info(dev, "receiver initialized\n");
return 0;
out_unreg:
rc_unregister_device(ir->rc);
ir->rc = NULL;
out_free:
rc_free_device(ir->rc);
return ret;
}
static int meson_ir_remove(struct platform_device *pdev)
{
struct meson_ir *ir = platform_get_drvdata(pdev);
unsigned long flags;
/* Disable the decoder */
spin_lock_irqsave(&ir->lock, flags);
meson_ir_set_mask(ir, IR_DEC_REG1, REG1_ENABLE, 0);
spin_unlock_irqrestore(&ir->lock, flags);
rc_unregister_device(ir->rc);
return 0;
}
static const struct of_device_id meson_ir_match[] = {
{ .compatible = "amlogic,meson6-ir" },
{ .compatible = "amlogic,meson8b-ir" },
{ .compatible = "amlogic,meson-gxbb-ir" },
{ },
};
MODULE_DEVICE_TABLE(of, meson_ir_match);
static struct platform_driver meson_ir_driver = {
.probe = meson_ir_probe,
.remove = meson_ir_remove,
.driver = {
.name = DRIVER_NAME,
.of_match_table = meson_ir_match,
},
};
module_platform_driver(meson_ir_driver);
MODULE_DESCRIPTION("Amlogic Meson IR remote receiver driver");
MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
MODULE_LICENSE("GPL v2");
|
