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12ddbadf BG |
1 | /* |
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 | ||
58 | struct meson_ir { | |
59 | void __iomem *reg; | |
60 | struct rc_dev *rc; | |
61 | int irq; | |
62 | spinlock_t lock; | |
63 | }; | |
64 | ||
65 | static 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 | ||
76 | static 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 | ||
98 | static 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; | |
174 | out_unreg: | |
175 | rc_unregister_device(ir->rc); | |
176 | ir->rc = NULL; | |
177 | out_free: | |
178 | rc_free_device(ir->rc); | |
179 | ||
180 | return ret; | |
181 | } | |
182 | ||
183 | static 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 | ||
198 | static const struct of_device_id meson_ir_match[] = { | |
199 | { .compatible = "amlogic,meson6-ir" }, | |
200 | { }, | |
201 | }; | |
202 | ||
203 | static 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 | ||
212 | module_platform_driver(meson_ir_driver); | |
213 | ||
214 | MODULE_DESCRIPTION("Amlogic Meson IR remote receiver driver"); | |
215 | MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>"); | |
216 | MODULE_LICENSE("GPL v2"); |