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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> |
17 | #include <linux/init.h> |
18 | #include <linux/interrupt.h> |
19 | #include <linux/types.h> |
20 | #include <linux/input.h> |
21 | #include <linux/kernel.h> |
22 | #include <linux/platform_device.h> |
23 | #include <linux/slab.h> |
24 | #include <linux/irq.h> |
25 | #include <linux/io.h> |
26 | |
27 | enum { |
28 | REG_READ = 0x00, |
29 | REG_SET_PAGE = 0x00, |
30 | REG_LEN = 0x04, |
31 | REG_DATA = 0x08, |
32 | |
33 | PAGE_NAME = 0x00000, |
34 | PAGE_EVBITS = 0x10000, |
35 | PAGE_ABSDATA = 0x20000 | EV_ABS, |
36 | }; |
37 | |
38 | struct event_dev { |
39 | struct input_dev *input; |
40 | int irq; |
41 | void __iomem *addr; |
42 | char name[0]; |
43 | }; |
44 | |
45 | static irqreturn_t events_interrupt(int irq, void *dev_id) |
46 | { |
47 | struct event_dev *edev = dev_id; |
48 | unsigned type, code, value; |
49 | |
50 | type = __raw_readl(edev->addr + REG_READ); |
51 | code = __raw_readl(edev->addr + REG_READ); |
52 | value = __raw_readl(edev->addr + REG_READ); |
53 | |
54 | input_event(edev->input, type, code, value); |
55 | input_sync(edev->input); |
56 | return IRQ_HANDLED; |
57 | } |
58 | |
59 | static void events_import_bits(struct event_dev *edev, |
60 | unsigned long bits[], unsigned type, size_t count) |
61 | { |
62 | void __iomem *addr = edev->addr; |
63 | int i, j; |
64 | size_t size; |
65 | uint8_t val; |
66 | |
67 | __raw_writel(PAGE_EVBITS | type, addr + REG_SET_PAGE); |
68 | |
69 | size = __raw_readl(addr + REG_LEN) * 8; |
70 | if (size < count) |
71 | count = size; |
72 | |
73 | addr += REG_DATA; |
74 | for (i = 0; i < count; i += 8) { |
75 | val = __raw_readb(addr++); |
76 | for (j = 0; j < 8; j++) |
77 | if (val & 1 << j) |
78 | set_bit(i + j, bits); |
79 | } |
80 | } |
81 | |
82 | static void events_import_abs_params(struct event_dev *edev) |
83 | { |
84 | struct input_dev *input_dev = edev->input; |
85 | void __iomem *addr = edev->addr; |
86 | u32 val[4]; |
87 | int count; |
88 | int i, j; |
89 | |
90 | __raw_writel(PAGE_ABSDATA, addr + REG_SET_PAGE); |
91 | |
92 | count = __raw_readl(addr + REG_LEN) / sizeof(val); |
93 | if (count > ABS_MAX) |
94 | count = ABS_MAX; |
95 | |
96 | for (i = 0; i < count; i++) { |
97 | if (!test_bit(i, input_dev->absbit)) |
98 | continue; |
99 | |
100 | for (j = 0; j < ARRAY_SIZE(val); j++) { |
101 | int offset = (i * ARRAY_SIZE(val) + j) * sizeof(u32); |
102 | val[j] = __raw_readl(edev->addr + REG_DATA + offset); |
103 | } |
104 | |
105 | input_set_abs_params(input_dev, i, |
106 | val[0], val[1], val[2], val[3]); |
107 | } |
108 | } |
109 | |
110 | static int events_probe(struct platform_device *pdev) |
111 | { |
112 | struct input_dev *input_dev; |
113 | struct event_dev *edev; |
114 | struct resource *res; |
115 | unsigned keymapnamelen; |
116 | void __iomem *addr; |
117 | int irq; |
118 | int i; |
119 | int error; |
120 | |
121 | irq = platform_get_irq(pdev, 0); |
122 | if (irq < 0) |
123 | return -EINVAL; |
124 | |
125 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
126 | if (!res) |
127 | return -EINVAL; |
128 | |
129 | addr = devm_ioremap(&pdev->dev, res->start, 4096); |
130 | if (!addr) |
131 | return -ENOMEM; |
132 | |
133 | __raw_writel(PAGE_NAME, addr + REG_SET_PAGE); |
134 | keymapnamelen = __raw_readl(addr + REG_LEN); |
135 | |
136 | edev = devm_kzalloc(&pdev->dev, |
137 | sizeof(struct event_dev) + keymapnamelen + 1, |
138 | GFP_KERNEL); |
139 | if (!edev) |
140 | return -ENOMEM; |
141 | |
142 | input_dev = devm_input_allocate_device(&pdev->dev); |
143 | if (!input_dev) |
144 | return -ENOMEM; |
145 | |
146 | edev->input = input_dev; |
147 | edev->addr = addr; |
148 | edev->irq = irq; |
149 | |
150 | for (i = 0; i < keymapnamelen; i++) |
151 | edev->name[i] = __raw_readb(edev->addr + REG_DATA + i); |
152 | |
153 | pr_debug("events_probe() keymap=%s\n", edev->name); |
154 | |
155 | input_dev->name = edev->name; |
156 | input_dev->id.bustype = BUS_HOST; |
157 | |
158 | events_import_bits(edev, input_dev->evbit, EV_SYN, EV_MAX); |
159 | events_import_bits(edev, input_dev->keybit, EV_KEY, KEY_MAX); |
160 | events_import_bits(edev, input_dev->relbit, EV_REL, REL_MAX); |
161 | events_import_bits(edev, input_dev->absbit, EV_ABS, ABS_MAX); |
162 | events_import_bits(edev, input_dev->mscbit, EV_MSC, MSC_MAX); |
163 | events_import_bits(edev, input_dev->ledbit, EV_LED, LED_MAX); |
164 | events_import_bits(edev, input_dev->sndbit, EV_SND, SND_MAX); |
165 | events_import_bits(edev, input_dev->ffbit, EV_FF, FF_MAX); |
166 | events_import_bits(edev, input_dev->swbit, EV_SW, SW_MAX); |
167 | |
168 | events_import_abs_params(edev); |
169 | |
170 | error = devm_request_irq(&pdev->dev, edev->irq, events_interrupt, 0, |
171 | "goldfish-events-keypad", edev); |
172 | if (error) |
173 | return error; |
174 | |
175 | error = input_register_device(input_dev); |
176 | if (error) |
177 | return error; |
178 | |
179 | return 0; |
180 | } |
181 | |
182 | static struct platform_driver events_driver = { |
183 | .probe = events_probe, |
184 | .driver = { |
185 | .owner = THIS_MODULE, |
186 | .name = "goldfish_events", |
187 | }, |
188 | }; |
189 | |
190 | module_platform_driver(events_driver); |
191 | |
192 | MODULE_AUTHOR("Brian Swetland"); |
193 | MODULE_DESCRIPTION("Goldfish Event Device"); |
194 | MODULE_LICENSE("GPL"); |
195 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9