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10#include <linux/device.h>
11#include <linux/err.h>
12#include <linux/interrupt.h>
13#include <linux/io.h>
14#include <linux/module.h>
15#include <linux/of_platform.h>
16#include <linux/platform_device.h>
17
18#include <media/rc-core.h>
19
20#define DRIVER_NAME "zx-irdec"
21
22#define ZX_IR_ENABLE 0x04
23#define ZX_IREN BIT(0)
24#define ZX_IR_CTRL 0x08
25#define ZX_DEGL_MASK GENMASK(21, 20)
26#define ZX_DEGL_VALUE(x) (((x) << 20) & ZX_DEGL_MASK)
27#define ZX_WDBEGIN_MASK GENMASK(18, 8)
28#define ZX_WDBEGIN_VALUE(x) (((x) << 8) & ZX_WDBEGIN_MASK)
29#define ZX_IR_INTEN 0x10
30#define ZX_IR_INTSTCLR 0x14
31#define ZX_IR_CODE 0x30
32#define ZX_IR_CNUM 0x34
33#define ZX_NECRPT BIT(16)
34
35struct zx_irdec {
36 void __iomem *base;
37 struct rc_dev *rcd;
38};
39
40static void zx_irdec_set_mask(struct zx_irdec *irdec, unsigned int reg,
41 u32 mask, u32 value)
42{
43 u32 data;
44
45 data = readl(irdec->base + reg);
46 data &= ~mask;
47 data |= value & mask;
48 writel(data, irdec->base + reg);
49}
50
51static irqreturn_t zx_irdec_irq(int irq, void *dev_id)
52{
53 struct zx_irdec *irdec = dev_id;
54 u8 address, not_address;
55 u8 command, not_command;
56 u32 rawcode, scancode;
57 enum rc_proto rc_proto;
58
59
60 writel(1, irdec->base + ZX_IR_INTSTCLR);
61
62
63 if (readl(irdec->base + ZX_IR_CNUM) & ZX_NECRPT) {
64 rc_repeat(irdec->rcd);
65 goto done;
66 }
67
68 rawcode = readl(irdec->base + ZX_IR_CODE);
69 not_command = (rawcode >> 24) & 0xff;
70 command = (rawcode >> 16) & 0xff;
71 not_address = (rawcode >> 8) & 0xff;
72 address = rawcode & 0xff;
73
74 scancode = ir_nec_bytes_to_scancode(address, not_address,
75 command, not_command,
76 &rc_proto);
77 rc_keydown(irdec->rcd, rc_proto, scancode, 0);
78
79done:
80 return IRQ_HANDLED;
81}
82
83static int zx_irdec_probe(struct platform_device *pdev)
84{
85 struct device *dev = &pdev->dev;
86 struct zx_irdec *irdec;
87 struct resource *res;
88 struct rc_dev *rcd;
89 int irq;
90 int ret;
91
92 irdec = devm_kzalloc(dev, sizeof(*irdec), GFP_KERNEL);
93 if (!irdec)
94 return -ENOMEM;
95
96 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
97 irdec->base = devm_ioremap_resource(dev, res);
98 if (IS_ERR(irdec->base))
99 return PTR_ERR(irdec->base);
100
101 irq = platform_get_irq(pdev, 0);
102 if (irq < 0)
103 return irq;
104
105 rcd = devm_rc_allocate_device(dev, RC_DRIVER_SCANCODE);
106 if (!rcd) {
107 dev_err(dev, "failed to allocate rc device\n");
108 return -ENOMEM;
109 }
110
111 irdec->rcd = rcd;
112
113 rcd->priv = irdec;
114 rcd->input_phys = DRIVER_NAME "/input0";
115 rcd->input_id.bustype = BUS_HOST;
116 rcd->map_name = RC_MAP_ZX_IRDEC;
117 rcd->allowed_protocols = RC_PROTO_BIT_NEC | RC_PROTO_BIT_NECX |
118 RC_PROTO_BIT_NEC32;
119 rcd->driver_name = DRIVER_NAME;
120 rcd->device_name = DRIVER_NAME;
121
122 platform_set_drvdata(pdev, irdec);
123
124 ret = devm_rc_register_device(dev, rcd);
125 if (ret) {
126 dev_err(dev, "failed to register rc device\n");
127 return ret;
128 }
129
130 ret = devm_request_irq(dev, irq, zx_irdec_irq, 0, NULL, irdec);
131 if (ret) {
132 dev_err(dev, "failed to request irq\n");
133 return ret;
134 }
135
136
137
138
139
140 zx_irdec_set_mask(irdec, ZX_IR_CTRL, ZX_DEGL_MASK, ZX_DEGL_VALUE(0));
141 zx_irdec_set_mask(irdec, ZX_IR_CTRL, ZX_WDBEGIN_MASK,
142 ZX_WDBEGIN_VALUE(0x21c));
143
144
145 writel(1, irdec->base + ZX_IR_INTEN);
146
147
148 zx_irdec_set_mask(irdec, ZX_IR_ENABLE, ZX_IREN, ZX_IREN);
149
150 return 0;
151}
152
153static int zx_irdec_remove(struct platform_device *pdev)
154{
155 struct zx_irdec *irdec = platform_get_drvdata(pdev);
156
157
158 zx_irdec_set_mask(irdec, ZX_IR_ENABLE, ZX_IREN, 0);
159
160
161 writel(0, irdec->base + ZX_IR_INTEN);
162
163 return 0;
164}
165
166static const struct of_device_id zx_irdec_match[] = {
167 { .compatible = "zte,zx296718-irdec" },
168 { },
169};
170MODULE_DEVICE_TABLE(of, zx_irdec_match);
171
172static struct platform_driver zx_irdec_driver = {
173 .probe = zx_irdec_probe,
174 .remove = zx_irdec_remove,
175 .driver = {
176 .name = DRIVER_NAME,
177 .of_match_table = zx_irdec_match,
178 },
179};
180module_platform_driver(zx_irdec_driver);
181
182MODULE_DESCRIPTION("ZTE ZX IR remote control driver");
183MODULE_AUTHOR("Shawn Guo <shawn.guo@linaro.org>");
184MODULE_LICENSE("GPL v2");
185
