diff options
Diffstat (limited to 'drivers/input/keyboard/goldfish_events.c')
-rw-r--r-- | drivers/input/keyboard/goldfish_events.c | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/drivers/input/keyboard/goldfish_events.c b/drivers/input/keyboard/goldfish_events.c new file mode 100644 index 000000000000..9f60a2ec88db --- /dev/null +++ b/drivers/input/keyboard/goldfish_events.c | |||
@@ -0,0 +1,194 @@ | |||
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"); | ||