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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> | |
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"); |