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/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#include <linux/acpi.h>
26
27enum {
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
38struct event_dev {
39 struct input_dev *input;
40 int irq;
41 void __iomem *addr;
42 char name[0];
43};
44
45static irqreturn_t events_interrupt(int irq, void *dev_id)
46{
47 struct event_dev *edev = dev_id;
48 unsigned int 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
59static void events_import_bits(struct event_dev *edev,
60 unsigned long bits[], unsigned int 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
82static 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
103 val[j] = __raw_readl(edev->addr + REG_DATA + offset);
104 }
105
106 input_set_abs_params(input_dev, i,
107 val[0], val[1], val[2], val[3]);
108 }
109}
110
111static int events_probe(struct platform_device *pdev)
112{
113 struct input_dev *input_dev;
114 struct event_dev *edev;
115 struct resource *res;
116 unsigned int keymapnamelen;
117 void __iomem *addr;
118 int irq;
119 int i;
120 int error;
121
122 irq = platform_get_irq(pdev, 0);
123 if (irq < 0)
124 return -EINVAL;
125
126 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
127 if (!res)
128 return -EINVAL;
129
130 addr = devm_ioremap(&pdev->dev, res->start, 4096);
131 if (!addr)
132 return -ENOMEM;
133
134 __raw_writel(PAGE_NAME, addr + REG_SET_PAGE);
135 keymapnamelen = __raw_readl(addr + REG_LEN);
136
137 edev = devm_kzalloc(&pdev->dev,
138 sizeof(struct event_dev) + keymapnamelen + 1,
139 GFP_KERNEL);
140 if (!edev)
141 return -ENOMEM;
142
143 input_dev = devm_input_allocate_device(&pdev->dev);
144 if (!input_dev)
145 return -ENOMEM;
146
147 edev->input = input_dev;
148 edev->addr = addr;
149 edev->irq = irq;
150
151 for (i = 0; i < keymapnamelen; i++)
152 edev->name[i] = __raw_readb(edev->addr + REG_DATA + i);
153
154 pr_debug("%s: keymap=%s\n", __func__, edev->name);
155
156 input_dev->name = edev->name;
157 input_dev->id.bustype = BUS_HOST;
158
159 events_import_bits(edev, input_dev->evbit, EV_SYN, EV_MAX);
160 events_import_bits(edev, input_dev->keybit, EV_KEY, KEY_MAX);
161 events_import_bits(edev, input_dev->relbit, EV_REL, REL_MAX);
162 events_import_bits(edev, input_dev->absbit, EV_ABS, ABS_MAX);
163 events_import_bits(edev, input_dev->mscbit, EV_MSC, MSC_MAX);
164 events_import_bits(edev, input_dev->ledbit, EV_LED, LED_MAX);
165 events_import_bits(edev, input_dev->sndbit, EV_SND, SND_MAX);
166 events_import_bits(edev, input_dev->ffbit, EV_FF, FF_MAX);
167 events_import_bits(edev, input_dev->swbit, EV_SW, SW_MAX);
168
169 events_import_abs_params(edev);
170
171 error = devm_request_irq(&pdev->dev, edev->irq, events_interrupt, 0,
172 "goldfish-events-keypad", edev);
173 if (error)
174 return error;
175
176 error = input_register_device(input_dev);
177 if (error)
178 return error;
179
180 return 0;
181}
182
183static const struct of_device_id goldfish_events_of_match[] = {
184 { .compatible = "google,goldfish-events-keypad", },
185 {},
186};
187MODULE_DEVICE_TABLE(of, goldfish_events_of_match);
188
189#ifdef CONFIG_ACPI
190static const struct acpi_device_id goldfish_events_acpi_match[] = {
191 { "GFSH0002", 0 },
192 { },
193};
194MODULE_DEVICE_TABLE(acpi, goldfish_events_acpi_match);
195#endif
196
197static struct platform_driver events_driver = {
198 .probe = events_probe,
199 .driver = {
200 .name = "goldfish_events",
201 .of_match_table = goldfish_events_of_match,
202 .acpi_match_table = ACPI_PTR(goldfish_events_acpi_match),
203 },
204};
205
206module_platform_driver(events_driver);
207
208MODULE_AUTHOR("Brian Swetland");
209MODULE_DESCRIPTION("Goldfish Event Device");
210MODULE_LICENSE("GPL");
211