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
32struct zx_irdec {
33	void __iomem *base;
34	struct rc_dev *rcd;
35};
36
37static 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
48static 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
76done:
77	return IRQ_HANDLED;
78}
79
80static 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
150static 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
163static const struct of_device_id zx_irdec_match[] = {
164	{ .compatible = "zte,zx296718-irdec" },
165	{ },
166};
167MODULE_DEVICE_TABLE(of, zx_irdec_match);
168
169static 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};
177module_platform_driver(zx_irdec_driver);
178
179MODULE_DESCRIPTION("ZTE ZX IR remote control driver");
180MODULE_AUTHOR("Shawn Guo <shawn.guo@linaro.org>");
181MODULE_LICENSE("GPL v2");
182