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6f2ac009 BS |
1 | /* |
2 | * Copyright (C) 2007 Google, Inc. | |
3 | * Copyright (C) 2012 Intel, Inc. | |
4 | * | |
5 | * This software is licensed under the terms of the GNU General Public | |
6 | * License version 2, as published by the Free Software Foundation, and | |
7 | * may be copied, distributed, and modified under those terms. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | */ | |
15 | ||
16 | #include <linux/module.h> | |
6f2ac009 BS |
17 | #include <linux/interrupt.h> |
18 | #include <linux/types.h> | |
19 | #include <linux/input.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/platform_device.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/irq.h> | |
24 | #include <linux/io.h> | |
25 | ||
26 | enum { | |
27 | REG_READ = 0x00, | |
28 | REG_SET_PAGE = 0x00, | |
29 | REG_LEN = 0x04, | |
30 | REG_DATA = 0x08, | |
31 | ||
32 | PAGE_NAME = 0x00000, | |
33 | PAGE_EVBITS = 0x10000, | |
34 | PAGE_ABSDATA = 0x20000 | EV_ABS, | |
35 | }; | |
36 | ||
37 | struct event_dev { | |
38 | struct input_dev *input; | |
39 | int irq; | |
40 | void __iomem *addr; | |
41 | char name[0]; | |
42 | }; | |
43 | ||
44 | static irqreturn_t events_interrupt(int irq, void *dev_id) | |
45 | { | |
46 | struct event_dev *edev = dev_id; | |
47 | unsigned type, code, value; | |
48 | ||
49 | type = __raw_readl(edev->addr + REG_READ); | |
50 | code = __raw_readl(edev->addr + REG_READ); | |
51 | value = __raw_readl(edev->addr + REG_READ); | |
52 | ||
53 | input_event(edev->input, type, code, value); | |
54 | input_sync(edev->input); | |
55 | return IRQ_HANDLED; | |
56 | } | |
57 | ||
58 | static void events_import_bits(struct event_dev *edev, | |
59 | unsigned long bits[], unsigned type, size_t count) | |
60 | { | |
61 | void __iomem *addr = edev->addr; | |
62 | int i, j; | |
63 | size_t size; | |
64 | uint8_t val; | |
65 | ||
66 | __raw_writel(PAGE_EVBITS | type, addr + REG_SET_PAGE); | |
67 | ||
68 | size = __raw_readl(addr + REG_LEN) * 8; | |
69 | if (size < count) | |
70 | count = size; | |
71 | ||
72 | addr += REG_DATA; | |
73 | for (i = 0; i < count; i += 8) { | |
74 | val = __raw_readb(addr++); | |
75 | for (j = 0; j < 8; j++) | |
76 | if (val & 1 << j) | |
77 | set_bit(i + j, bits); | |
78 | } | |
79 | } | |
80 | ||
81 | static void events_import_abs_params(struct event_dev *edev) | |
82 | { | |
83 | struct input_dev *input_dev = edev->input; | |
84 | void __iomem *addr = edev->addr; | |
85 | u32 val[4]; | |
86 | int count; | |
87 | int i, j; | |
88 | ||
89 | __raw_writel(PAGE_ABSDATA, addr + REG_SET_PAGE); | |
90 | ||
91 | count = __raw_readl(addr + REG_LEN) / sizeof(val); | |
92 | if (count > ABS_MAX) | |
93 | count = ABS_MAX; | |
94 | ||
95 | for (i = 0; i < count; i++) { | |
96 | if (!test_bit(i, input_dev->absbit)) | |
97 | continue; | |
98 | ||
99 | for (j = 0; j < ARRAY_SIZE(val); j++) { | |
100 | int offset = (i * ARRAY_SIZE(val) + j) * sizeof(u32); | |
101 | val[j] = __raw_readl(edev->addr + REG_DATA + offset); | |
102 | } | |
103 | ||
104 | input_set_abs_params(input_dev, i, | |
105 | val[0], val[1], val[2], val[3]); | |
106 | } | |
107 | } | |
108 | ||
109 | static int events_probe(struct platform_device *pdev) | |
110 | { | |
111 | struct input_dev *input_dev; | |
112 | struct event_dev *edev; | |
113 | struct resource *res; | |
114 | unsigned keymapnamelen; | |
115 | void __iomem *addr; | |
116 | int irq; | |
117 | int i; | |
118 | int error; | |
119 | ||
120 | irq = platform_get_irq(pdev, 0); | |
121 | if (irq < 0) | |
122 | return -EINVAL; | |
123 | ||
124 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
125 | if (!res) | |
126 | return -EINVAL; | |
127 | ||
128 | addr = devm_ioremap(&pdev->dev, res->start, 4096); | |
129 | if (!addr) | |
130 | return -ENOMEM; | |
131 | ||
132 | __raw_writel(PAGE_NAME, addr + REG_SET_PAGE); | |
133 | keymapnamelen = __raw_readl(addr + REG_LEN); | |
134 | ||
135 | edev = devm_kzalloc(&pdev->dev, | |
136 | sizeof(struct event_dev) + keymapnamelen + 1, | |
137 | GFP_KERNEL); | |
138 | if (!edev) | |
139 | return -ENOMEM; | |
140 | ||
141 | input_dev = devm_input_allocate_device(&pdev->dev); | |
142 | if (!input_dev) | |
143 | return -ENOMEM; | |
144 | ||
145 | edev->input = input_dev; | |
146 | edev->addr = addr; | |
147 | edev->irq = irq; | |
148 | ||
149 | for (i = 0; i < keymapnamelen; i++) | |
150 | edev->name[i] = __raw_readb(edev->addr + REG_DATA + i); | |
151 | ||
152 | pr_debug("events_probe() keymap=%s\n", edev->name); | |
153 | ||
154 | input_dev->name = edev->name; | |
155 | input_dev->id.bustype = BUS_HOST; | |
156 | ||
157 | events_import_bits(edev, input_dev->evbit, EV_SYN, EV_MAX); | |
158 | events_import_bits(edev, input_dev->keybit, EV_KEY, KEY_MAX); | |
159 | events_import_bits(edev, input_dev->relbit, EV_REL, REL_MAX); | |
160 | events_import_bits(edev, input_dev->absbit, EV_ABS, ABS_MAX); | |
161 | events_import_bits(edev, input_dev->mscbit, EV_MSC, MSC_MAX); | |
162 | events_import_bits(edev, input_dev->ledbit, EV_LED, LED_MAX); | |
163 | events_import_bits(edev, input_dev->sndbit, EV_SND, SND_MAX); | |
164 | events_import_bits(edev, input_dev->ffbit, EV_FF, FF_MAX); | |
165 | events_import_bits(edev, input_dev->swbit, EV_SW, SW_MAX); | |
166 | ||
167 | events_import_abs_params(edev); | |
168 | ||
169 | error = devm_request_irq(&pdev->dev, edev->irq, events_interrupt, 0, | |
170 | "goldfish-events-keypad", edev); | |
171 | if (error) | |
172 | return error; | |
173 | ||
174 | error = input_register_device(input_dev); | |
175 | if (error) | |
176 | return error; | |
177 | ||
178 | return 0; | |
179 | } | |
180 | ||
181 | static struct platform_driver events_driver = { | |
182 | .probe = events_probe, | |
183 | .driver = { | |
184 | .owner = THIS_MODULE, | |
185 | .name = "goldfish_events", | |
186 | }, | |
187 | }; | |
188 | ||
189 | module_platform_driver(events_driver); | |
190 | ||
191 | MODULE_AUTHOR("Brian Swetland"); | |
192 | MODULE_DESCRIPTION("Goldfish Event Device"); | |
193 | MODULE_LICENSE("GPL"); |