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Beniamino Galvani12ddbad2014-11-18 17:22:34 -03001/*
2 * Driver for Amlogic Meson IR remote receiver
3 *
4 * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * version 2 as published by the Free Software Foundation.
9 *
10 * You should have received a copy of the GNU General Public License
11 * along with this program. If not, see <http://www.gnu.org/licenses/>.
12 */
13
14#include <linux/device.h>
15#include <linux/err.h>
16#include <linux/interrupt.h>
17#include <linux/io.h>
18#include <linux/module.h>
19#include <linux/of_platform.h>
20#include <linux/platform_device.h>
21#include <linux/spinlock.h>
22
23#include <media/rc-core.h>
24
25#define DRIVER_NAME "meson-ir"
26
27#define IR_DEC_LDR_ACTIVE 0x00
28#define IR_DEC_LDR_IDLE 0x04
29#define IR_DEC_LDR_REPEAT 0x08
30#define IR_DEC_BIT_0 0x0c
31#define IR_DEC_REG0 0x10
32#define IR_DEC_FRAME 0x14
33#define IR_DEC_STATUS 0x18
34#define IR_DEC_REG1 0x1c
35
36#define REG0_RATE_MASK (BIT(11) - 1)
37
38#define REG1_MODE_MASK (BIT(7) | BIT(8))
39#define REG1_MODE_NEC (0 << 7)
40#define REG1_MODE_GENERAL (2 << 7)
41
42#define REG1_TIME_IV_SHIFT 16
43#define REG1_TIME_IV_MASK ((BIT(13) - 1) << REG1_TIME_IV_SHIFT)
44
45#define REG1_IRQSEL_MASK (BIT(2) | BIT(3))
46#define REG1_IRQSEL_NEC_MODE (0 << 2)
47#define REG1_IRQSEL_RISE_FALL (1 << 2)
48#define REG1_IRQSEL_FALL (2 << 2)
49#define REG1_IRQSEL_RISE (3 << 2)
50
51#define REG1_RESET BIT(0)
52#define REG1_ENABLE BIT(15)
53
54#define STATUS_IR_DEC_IN BIT(8)
55
56#define MESON_TRATE 10 /* us */
57
58struct meson_ir {
59 void __iomem *reg;
60 struct rc_dev *rc;
61 int irq;
62 spinlock_t lock;
63};
64
65static void meson_ir_set_mask(struct meson_ir *ir, unsigned int reg,
66 u32 mask, u32 value)
67{
68 u32 data;
69
70 data = readl(ir->reg + reg);
71 data &= ~mask;
72 data |= (value & mask);
73 writel(data, ir->reg + reg);
74}
75
76static irqreturn_t meson_ir_irq(int irqno, void *dev_id)
77{
78 struct meson_ir *ir = dev_id;
79 u32 duration;
80 DEFINE_IR_RAW_EVENT(rawir);
81
82 spin_lock(&ir->lock);
83
84 duration = readl(ir->reg + IR_DEC_REG1);
85 duration = (duration & REG1_TIME_IV_MASK) >> REG1_TIME_IV_SHIFT;
86 rawir.duration = US_TO_NS(duration * MESON_TRATE);
87
88 rawir.pulse = !!(readl(ir->reg + IR_DEC_STATUS) & STATUS_IR_DEC_IN);
89
90 ir_raw_event_store_with_filter(ir->rc, &rawir);
91 ir_raw_event_handle(ir->rc);
92
93 spin_unlock(&ir->lock);
94
95 return IRQ_HANDLED;
96}
97
98static int meson_ir_probe(struct platform_device *pdev)
99{
100 struct device *dev = &pdev->dev;
101 struct device_node *node = dev->of_node;
102 struct resource *res;
103 const char *map_name;
104 struct meson_ir *ir;
105 int ret;
106
107 ir = devm_kzalloc(dev, sizeof(struct meson_ir), GFP_KERNEL);
108 if (!ir)
109 return -ENOMEM;
110
111 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
112 ir->reg = devm_ioremap_resource(dev, res);
113 if (IS_ERR(ir->reg)) {
114 dev_err(dev, "failed to map registers\n");
115 return PTR_ERR(ir->reg);
116 }
117
118 ir->irq = platform_get_irq(pdev, 0);
119 if (ir->irq < 0) {
120 dev_err(dev, "no irq resource\n");
121 return ir->irq;
122 }
123
124 ir->rc = rc_allocate_device();
125 if (!ir->rc) {
126 dev_err(dev, "failed to allocate rc device\n");
127 return -ENOMEM;
128 }
129
130 ir->rc->priv = ir;
131 ir->rc->input_name = DRIVER_NAME;
132 ir->rc->input_phys = DRIVER_NAME "/input0";
133 ir->rc->input_id.bustype = BUS_HOST;
134 map_name = of_get_property(node, "linux,rc-map-name", NULL);
135 ir->rc->map_name = map_name ? map_name : RC_MAP_EMPTY;
136 ir->rc->dev.parent = dev;
137 ir->rc->driver_type = RC_DRIVER_IR_RAW;
138 ir->rc->allowed_protocols = RC_BIT_ALL;
139 ir->rc->rx_resolution = US_TO_NS(MESON_TRATE);
140 ir->rc->timeout = MS_TO_NS(200);
141 ir->rc->driver_name = DRIVER_NAME;
142
143 spin_lock_init(&ir->lock);
144 platform_set_drvdata(pdev, ir);
145
146 ret = rc_register_device(ir->rc);
147 if (ret) {
148 dev_err(dev, "failed to register rc device\n");
149 goto out_free;
150 }
151
152 ret = devm_request_irq(dev, ir->irq, meson_ir_irq, 0, "ir-meson", ir);
153 if (ret) {
154 dev_err(dev, "failed to request irq\n");
155 goto out_unreg;
156 }
157
158 /* Reset the decoder */
159 meson_ir_set_mask(ir, IR_DEC_REG1, REG1_RESET, REG1_RESET);
160 meson_ir_set_mask(ir, IR_DEC_REG1, REG1_RESET, 0);
161 /* Set general operation mode */
162 meson_ir_set_mask(ir, IR_DEC_REG1, REG1_MODE_MASK, REG1_MODE_GENERAL);
163 /* Set rate */
164 meson_ir_set_mask(ir, IR_DEC_REG0, REG0_RATE_MASK, MESON_TRATE - 1);
165 /* IRQ on rising and falling edges */
166 meson_ir_set_mask(ir, IR_DEC_REG1, REG1_IRQSEL_MASK,
167 REG1_IRQSEL_RISE_FALL);
168 /* Enable the decoder */
169 meson_ir_set_mask(ir, IR_DEC_REG1, REG1_ENABLE, REG1_ENABLE);
170
171 dev_info(dev, "receiver initialized\n");
172
173 return 0;
174out_unreg:
175 rc_unregister_device(ir->rc);
176 ir->rc = NULL;
177out_free:
178 rc_free_device(ir->rc);
179
180 return ret;
181}
182
183static int meson_ir_remove(struct platform_device *pdev)
184{
185 struct meson_ir *ir = platform_get_drvdata(pdev);
186 unsigned long flags;
187
188 /* Disable the decoder */
189 spin_lock_irqsave(&ir->lock, flags);
190 meson_ir_set_mask(ir, IR_DEC_REG1, REG1_ENABLE, 0);
191 spin_unlock_irqrestore(&ir->lock, flags);
192
193 rc_unregister_device(ir->rc);
194
195 return 0;
196}
197
198static const struct of_device_id meson_ir_match[] = {
199 { .compatible = "amlogic,meson6-ir" },
200 { },
201};
202
203static struct platform_driver meson_ir_driver = {
204 .probe = meson_ir_probe,
205 .remove = meson_ir_remove,
206 .driver = {
207 .name = DRIVER_NAME,
208 .of_match_table = meson_ir_match,
209 },
210};
211
212module_platform_driver(meson_ir_driver);
213
214MODULE_DESCRIPTION("Amlogic Meson IR remote receiver driver");
215MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
216MODULE_LICENSE("GPL v2");