1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2017 Sanechips Technology Co., Ltd.
4 * Copyright 2017 Linaro Ltd.
5 */
6
7 #include <linux/device.h>
8 #include <linux/err.h>
9 #include <linux/interrupt.h>
10 #include <linux/io.h>
11 #include <linux/module.h>
12 #include <linux/of_platform.h>
13 #include <linux/platform_device.h>
14
15 #include <media/rc-core.h>
16
17 #define DRIVER_NAME "zx-irdec"
18
19 #define ZX_IR_ENABLE 0x04
20 #define ZX_IREN BIT(0)
21 #define ZX_IR_CTRL 0x08
22 #define ZX_DEGL_MASK GENMASK(21, 20)
23 #define ZX_DEGL_VALUE(x) (((x) << 20) & ZX_DEGL_MASK)
24 #define ZX_WDBEGIN_MASK GENMASK(18, 8)
25 #define ZX_WDBEGIN_VALUE(x) (((x) << 8) & ZX_WDBEGIN_MASK)
26 #define ZX_IR_INTEN 0x10
27 #define ZX_IR_INTSTCLR 0x14
28 #define ZX_IR_CODE 0x30
29 #define ZX_IR_CNUM 0x34
30 #define ZX_NECRPT BIT(16)
31
32 struct zx_irdec {
33 void __iomem *base;
34 struct rc_dev *rcd;
35 };
36
zx_irdec_set_mask(struct zx_irdec * irdec,unsigned int reg,u32 mask,u32 value)37 static void zx_irdec_set_mask(struct zx_irdec *irdec, unsigned int reg,
38 u32 mask, u32 value)
39 {
40 u32 data;
41
42 data = readl(irdec->base + reg);
43 data &= ~mask;
44 data |= value & mask;
45 writel(data, irdec->base + reg);
46 }
47
zx_irdec_irq(int irq,void * dev_id)48 static irqreturn_t zx_irdec_irq(int irq, void *dev_id)
49 {
50 struct zx_irdec *irdec = dev_id;
51 u8 address, not_address;
52 u8 command, not_command;
53 u32 rawcode, scancode;
54 enum rc_proto rc_proto;
55
56 /* Clear interrupt */
57 writel(1, irdec->base + ZX_IR_INTSTCLR);
58
59 /* Check repeat frame */
60 if (readl(irdec->base + ZX_IR_CNUM) & ZX_NECRPT) {
61 rc_repeat(irdec->rcd);
62 goto done;
63 }
64
65 rawcode = readl(irdec->base + ZX_IR_CODE);
66 not_command = (rawcode >> 24) & 0xff;
67 command = (rawcode >> 16) & 0xff;
68 not_address = (rawcode >> 8) & 0xff;
69 address = rawcode & 0xff;
70
71 scancode = ir_nec_bytes_to_scancode(address, not_address,
72 command, not_command,
73 &rc_proto);
74 rc_keydown(irdec->rcd, rc_proto, scancode, 0);
75
76 done:
77 return IRQ_HANDLED;
78 }
79
zx_irdec_probe(struct platform_device * pdev)80 static int zx_irdec_probe(struct platform_device *pdev)
81 {
82 struct device *dev = &pdev->dev;
83 struct zx_irdec *irdec;
84 struct resource *res;
85 struct rc_dev *rcd;
86 int irq;
87 int ret;
88
89 irdec = devm_kzalloc(dev, sizeof(*irdec), GFP_KERNEL);
90 if (!irdec)
91 return -ENOMEM;
92
93 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
94 irdec->base = devm_ioremap_resource(dev, res);
95 if (IS_ERR(irdec->base))
96 return PTR_ERR(irdec->base);
97
98 irq = platform_get_irq(pdev, 0);
99 if (irq < 0)
100 return irq;
101
102 rcd = devm_rc_allocate_device(dev, RC_DRIVER_SCANCODE);
103 if (!rcd) {
104 dev_err(dev, "failed to allocate rc device\n");
105 return -ENOMEM;
106 }
107
108 irdec->rcd = rcd;
109
110 rcd->priv = irdec;
111 rcd->input_phys = DRIVER_NAME "/input0";
112 rcd->input_id.bustype = BUS_HOST;
113 rcd->map_name = RC_MAP_ZX_IRDEC;
114 rcd->allowed_protocols = RC_PROTO_BIT_NEC | RC_PROTO_BIT_NECX |
115 RC_PROTO_BIT_NEC32;
116 rcd->driver_name = DRIVER_NAME;
117 rcd->device_name = DRIVER_NAME;
118
119 platform_set_drvdata(pdev, irdec);
120
121 ret = devm_rc_register_device(dev, rcd);
122 if (ret) {
123 dev_err(dev, "failed to register rc device\n");
124 return ret;
125 }
126
127 ret = devm_request_irq(dev, irq, zx_irdec_irq, 0, NULL, irdec);
128 if (ret) {
129 dev_err(dev, "failed to request irq\n");
130 return ret;
131 }
132
133 /*
134 * Initialize deglitch level and watchdog counter beginner as
135 * recommended by vendor BSP code.
136 */
137 zx_irdec_set_mask(irdec, ZX_IR_CTRL, ZX_DEGL_MASK, ZX_DEGL_VALUE(0));
138 zx_irdec_set_mask(irdec, ZX_IR_CTRL, ZX_WDBEGIN_MASK,
139 ZX_WDBEGIN_VALUE(0x21c));
140
141 /* Enable interrupt */
142 writel(1, irdec->base + ZX_IR_INTEN);
143
144 /* Enable the decoder */
145 zx_irdec_set_mask(irdec, ZX_IR_ENABLE, ZX_IREN, ZX_IREN);
146
147 return 0;
148 }
149
zx_irdec_remove(struct platform_device * pdev)150 static int zx_irdec_remove(struct platform_device *pdev)
151 {
152 struct zx_irdec *irdec = platform_get_drvdata(pdev);
153
154 /* Disable the decoder */
155 zx_irdec_set_mask(irdec, ZX_IR_ENABLE, ZX_IREN, 0);
156
157 /* Disable interrupt */
158 writel(0, irdec->base + ZX_IR_INTEN);
159
160 return 0;
161 }
162
163 static const struct of_device_id zx_irdec_match[] = {
164 { .compatible = "zte,zx296718-irdec" },
165 { },
166 };
167 MODULE_DEVICE_TABLE(of, zx_irdec_match);
168
169 static struct platform_driver zx_irdec_driver = {
170 .probe = zx_irdec_probe,
171 .remove = zx_irdec_remove,
172 .driver = {
173 .name = DRIVER_NAME,
174 .of_match_table = zx_irdec_match,
175 },
176 };
177 module_platform_driver(zx_irdec_driver);
178
179 MODULE_DESCRIPTION("ZTE ZX IR remote control driver");
180 MODULE_AUTHOR("Shawn Guo <shawn.guo@linaro.org>");
181 MODULE_LICENSE("GPL v2");
182