1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Copyright (C) 2007 Google, Inc. |
4 | * Copyright (C) 2012 Intel, Inc. |
5 | */ |
6 | |
7 | #include <linux/module.h> |
8 | #include <linux/interrupt.h> |
9 | #include <linux/types.h> |
10 | #include <linux/input.h> |
11 | #include <linux/kernel.h> |
12 | #include <linux/platform_device.h> |
13 | #include <linux/slab.h> |
14 | #include <linux/irq.h> |
15 | #include <linux/io.h> |
16 | #include <linux/acpi.h> |
17 | |
18 | enum { |
19 | REG_READ = 0x00, |
20 | REG_SET_PAGE = 0x00, |
21 | REG_LEN = 0x04, |
22 | REG_DATA = 0x08, |
23 | |
24 | PAGE_NAME = 0x00000, |
25 | PAGE_EVBITS = 0x10000, |
26 | PAGE_ABSDATA = 0x20000 | EV_ABS, |
27 | }; |
28 | |
29 | struct event_dev { |
30 | struct input_dev *input; |
31 | int irq; |
32 | void __iomem *addr; |
33 | char name[]; |
34 | }; |
35 | |
36 | static irqreturn_t events_interrupt(int irq, void *dev_id) |
37 | { |
38 | struct event_dev *edev = dev_id; |
39 | unsigned int type, code, value; |
40 | |
41 | type = __raw_readl(addr: edev->addr + REG_READ); |
42 | code = __raw_readl(addr: edev->addr + REG_READ); |
43 | value = __raw_readl(addr: edev->addr + REG_READ); |
44 | |
45 | input_event(dev: edev->input, type, code, value); |
46 | input_sync(dev: edev->input); |
47 | return IRQ_HANDLED; |
48 | } |
49 | |
50 | static void events_import_bits(struct event_dev *edev, |
51 | unsigned long bits[], unsigned int type, size_t count) |
52 | { |
53 | void __iomem *addr = edev->addr; |
54 | int i, j; |
55 | size_t size; |
56 | uint8_t val; |
57 | |
58 | __raw_writel(val: PAGE_EVBITS | type, addr: addr + REG_SET_PAGE); |
59 | |
60 | size = __raw_readl(addr: addr + REG_LEN) * 8; |
61 | if (size < count) |
62 | count = size; |
63 | |
64 | addr += REG_DATA; |
65 | for (i = 0; i < count; i += 8) { |
66 | val = __raw_readb(addr: addr++); |
67 | for (j = 0; j < 8; j++) |
68 | if (val & 1 << j) |
69 | set_bit(nr: i + j, addr: bits); |
70 | } |
71 | } |
72 | |
73 | static void events_import_abs_params(struct event_dev *edev) |
74 | { |
75 | struct input_dev *input_dev = edev->input; |
76 | void __iomem *addr = edev->addr; |
77 | u32 val[4]; |
78 | int count; |
79 | int i, j; |
80 | |
81 | __raw_writel(val: PAGE_ABSDATA, addr: addr + REG_SET_PAGE); |
82 | |
83 | count = __raw_readl(addr: addr + REG_LEN) / sizeof(val); |
84 | if (count > ABS_MAX) |
85 | count = ABS_MAX; |
86 | |
87 | for (i = 0; i < count; i++) { |
88 | if (!test_bit(i, input_dev->absbit)) |
89 | continue; |
90 | |
91 | for (j = 0; j < ARRAY_SIZE(val); j++) { |
92 | int offset = (i * ARRAY_SIZE(val) + j) * sizeof(u32); |
93 | |
94 | val[j] = __raw_readl(addr: edev->addr + REG_DATA + offset); |
95 | } |
96 | |
97 | input_set_abs_params(dev: input_dev, axis: i, |
98 | min: val[0], max: val[1], fuzz: val[2], flat: val[3]); |
99 | } |
100 | } |
101 | |
102 | static int events_probe(struct platform_device *pdev) |
103 | { |
104 | struct input_dev *input_dev; |
105 | struct event_dev *edev; |
106 | struct resource *res; |
107 | unsigned int keymapnamelen; |
108 | void __iomem *addr; |
109 | int irq; |
110 | int i; |
111 | int error; |
112 | |
113 | irq = platform_get_irq(pdev, 0); |
114 | if (irq < 0) |
115 | return -EINVAL; |
116 | |
117 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
118 | if (!res) |
119 | return -EINVAL; |
120 | |
121 | addr = devm_ioremap(dev: &pdev->dev, offset: res->start, size: 4096); |
122 | if (!addr) |
123 | return -ENOMEM; |
124 | |
125 | __raw_writel(val: PAGE_NAME, addr: addr + REG_SET_PAGE); |
126 | keymapnamelen = __raw_readl(addr: addr + REG_LEN); |
127 | |
128 | edev = devm_kzalloc(dev: &pdev->dev, |
129 | size: sizeof(struct event_dev) + keymapnamelen + 1, |
130 | GFP_KERNEL); |
131 | if (!edev) |
132 | return -ENOMEM; |
133 | |
134 | input_dev = devm_input_allocate_device(&pdev->dev); |
135 | if (!input_dev) |
136 | return -ENOMEM; |
137 | |
138 | edev->input = input_dev; |
139 | edev->addr = addr; |
140 | edev->irq = irq; |
141 | |
142 | for (i = 0; i < keymapnamelen; i++) |
143 | edev->name[i] = __raw_readb(addr: edev->addr + REG_DATA + i); |
144 | |
145 | pr_debug("%s: keymap=%s\n" , __func__, edev->name); |
146 | |
147 | input_dev->name = edev->name; |
148 | input_dev->id.bustype = BUS_HOST; |
149 | |
150 | events_import_bits(edev, bits: input_dev->evbit, EV_SYN, EV_MAX); |
151 | events_import_bits(edev, bits: input_dev->keybit, EV_KEY, KEY_MAX); |
152 | events_import_bits(edev, bits: input_dev->relbit, EV_REL, REL_MAX); |
153 | events_import_bits(edev, bits: input_dev->absbit, EV_ABS, ABS_MAX); |
154 | events_import_bits(edev, bits: input_dev->mscbit, EV_MSC, MSC_MAX); |
155 | events_import_bits(edev, bits: input_dev->ledbit, EV_LED, LED_MAX); |
156 | events_import_bits(edev, bits: input_dev->sndbit, EV_SND, SND_MAX); |
157 | events_import_bits(edev, bits: input_dev->ffbit, EV_FF, FF_MAX); |
158 | events_import_bits(edev, bits: input_dev->swbit, EV_SW, SW_MAX); |
159 | |
160 | events_import_abs_params(edev); |
161 | |
162 | error = devm_request_irq(dev: &pdev->dev, irq: edev->irq, handler: events_interrupt, irqflags: 0, |
163 | devname: "goldfish-events-keypad" , dev_id: edev); |
164 | if (error) |
165 | return error; |
166 | |
167 | error = input_register_device(input_dev); |
168 | if (error) |
169 | return error; |
170 | |
171 | return 0; |
172 | } |
173 | |
174 | static const struct of_device_id goldfish_events_of_match[] = { |
175 | { .compatible = "google,goldfish-events-keypad" , }, |
176 | {}, |
177 | }; |
178 | MODULE_DEVICE_TABLE(of, goldfish_events_of_match); |
179 | |
180 | #ifdef CONFIG_ACPI |
181 | static const struct acpi_device_id goldfish_events_acpi_match[] = { |
182 | { "GFSH0002" , 0 }, |
183 | { }, |
184 | }; |
185 | MODULE_DEVICE_TABLE(acpi, goldfish_events_acpi_match); |
186 | #endif |
187 | |
188 | static struct platform_driver events_driver = { |
189 | .probe = events_probe, |
190 | .driver = { |
191 | .name = "goldfish_events" , |
192 | .of_match_table = goldfish_events_of_match, |
193 | .acpi_match_table = ACPI_PTR(goldfish_events_acpi_match), |
194 | }, |
195 | }; |
196 | |
197 | module_platform_driver(events_driver); |
198 | |
199 | MODULE_AUTHOR("Brian Swetland" ); |
200 | MODULE_DESCRIPTION("Goldfish Event Device" ); |
201 | MODULE_LICENSE("GPL" ); |
202 | |