]>
Commit | Line | Data |
---|---|---|
9c92ab61 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
6f2ac009 BS |
2 | /* |
3 | * Copyright (C) 2007 Google, Inc. | |
4 | * Copyright (C) 2012 Intel, Inc. | |
6f2ac009 BS |
5 | */ |
6 | ||
7 | #include <linux/module.h> | |
6f2ac009 BS |
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> | |
0581ce09 | 16 | #include <linux/acpi.h> |
6f2ac009 BS |
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[0]; | |
34 | }; | |
35 | ||
36 | static irqreturn_t events_interrupt(int irq, void *dev_id) | |
37 | { | |
38 | struct event_dev *edev = dev_id; | |
8f6a652a | 39 | unsigned int type, code, value; |
6f2ac009 BS |
40 | |
41 | type = __raw_readl(edev->addr + REG_READ); | |
42 | code = __raw_readl(edev->addr + REG_READ); | |
43 | value = __raw_readl(edev->addr + REG_READ); | |
44 | ||
45 | input_event(edev->input, type, code, value); | |
46 | input_sync(edev->input); | |
47 | return IRQ_HANDLED; | |
48 | } | |
49 | ||
50 | static void events_import_bits(struct event_dev *edev, | |
8f6a652a | 51 | unsigned long bits[], unsigned int type, size_t count) |
6f2ac009 BS |
52 | { |
53 | void __iomem *addr = edev->addr; | |
54 | int i, j; | |
55 | size_t size; | |
56 | uint8_t val; | |
57 | ||
58 | __raw_writel(PAGE_EVBITS | type, addr + REG_SET_PAGE); | |
59 | ||
60 | size = __raw_readl(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++); | |
67 | for (j = 0; j < 8; j++) | |
68 | if (val & 1 << j) | |
69 | set_bit(i + j, 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(PAGE_ABSDATA, addr + REG_SET_PAGE); | |
82 | ||
83 | count = __raw_readl(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); | |
8f6a652a | 93 | |
6f2ac009 BS |
94 | val[j] = __raw_readl(edev->addr + REG_DATA + offset); |
95 | } | |
96 | ||
97 | input_set_abs_params(input_dev, i, | |
98 | val[0], val[1], val[2], 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; | |
8f6a652a | 107 | unsigned int keymapnamelen; |
6f2ac009 BS |
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(&pdev->dev, res->start, 4096); | |
122 | if (!addr) | |
123 | return -ENOMEM; | |
124 | ||
125 | __raw_writel(PAGE_NAME, addr + REG_SET_PAGE); | |
126 | keymapnamelen = __raw_readl(addr + REG_LEN); | |
127 | ||
128 | edev = devm_kzalloc(&pdev->dev, | |
129 | 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(edev->addr + REG_DATA + i); | |
144 | ||
8f6a652a | 145 | pr_debug("%s: keymap=%s\n", __func__, edev->name); |
6f2ac009 BS |
146 | |
147 | input_dev->name = edev->name; | |
148 | input_dev->id.bustype = BUS_HOST; | |
149 | ||
150 | events_import_bits(edev, input_dev->evbit, EV_SYN, EV_MAX); | |
151 | events_import_bits(edev, input_dev->keybit, EV_KEY, KEY_MAX); | |
152 | events_import_bits(edev, input_dev->relbit, EV_REL, REL_MAX); | |
153 | events_import_bits(edev, input_dev->absbit, EV_ABS, ABS_MAX); | |
154 | events_import_bits(edev, input_dev->mscbit, EV_MSC, MSC_MAX); | |
155 | events_import_bits(edev, input_dev->ledbit, EV_LED, LED_MAX); | |
156 | events_import_bits(edev, input_dev->sndbit, EV_SND, SND_MAX); | |
157 | events_import_bits(edev, input_dev->ffbit, EV_FF, FF_MAX); | |
158 | events_import_bits(edev, input_dev->swbit, EV_SW, SW_MAX); | |
159 | ||
160 | events_import_abs_params(edev); | |
161 | ||
162 | error = devm_request_irq(&pdev->dev, edev->irq, events_interrupt, 0, | |
163 | "goldfish-events-keypad", 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 | ||
8c5dc5a1 GH |
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 | ||
0581ce09 JH |
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 | ||
6f2ac009 BS |
188 | static struct platform_driver events_driver = { |
189 | .probe = events_probe, | |
190 | .driver = { | |
6f2ac009 | 191 | .name = "goldfish_events", |
8c5dc5a1 | 192 | .of_match_table = goldfish_events_of_match, |
0581ce09 | 193 | .acpi_match_table = ACPI_PTR(goldfish_events_acpi_match), |
6f2ac009 BS |
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"); |