2 * Copyright (C) 2007 Google, Inc.
3 * Copyright (C) 2012 Intel, Inc.
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.
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.
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>
34 PAGE_EVBITS = 0x10000,
35 PAGE_ABSDATA = 0x20000 | EV_ABS,
39 struct input_dev *input;
45 static irqreturn_t events_interrupt(int irq, void *dev_id)
47 struct event_dev *edev = dev_id;
48 unsigned type, code, value;
50 type = __raw_readl(edev->addr + REG_READ);
51 code = __raw_readl(edev->addr + REG_READ);
52 value = __raw_readl(edev->addr + REG_READ);
54 input_event(edev->input, type, code, value);
55 input_sync(edev->input);
59 static void events_import_bits(struct event_dev *edev,
60 unsigned long bits[], unsigned type, size_t count)
62 void __iomem *addr = edev->addr;
67 __raw_writel(PAGE_EVBITS | type, addr + REG_SET_PAGE);
69 size = __raw_readl(addr + REG_LEN) * 8;
74 for (i = 0; i < count; i += 8) {
75 val = __raw_readb(addr++);
76 for (j = 0; j < 8; j++)
82 static void events_import_abs_params(struct event_dev *edev)
84 struct input_dev *input_dev = edev->input;
85 void __iomem *addr = edev->addr;
90 __raw_writel(PAGE_ABSDATA, addr + REG_SET_PAGE);
92 count = __raw_readl(addr + REG_LEN) / sizeof(val);
96 for (i = 0; i < count; i++) {
97 if (!test_bit(i, input_dev->absbit))
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);
105 input_set_abs_params(input_dev, i,
106 val[0], val[1], val[2], val[3]);
110 static int events_probe(struct platform_device *pdev)
112 struct input_dev *input_dev;
113 struct event_dev *edev;
114 struct resource *res;
115 unsigned keymapnamelen;
121 irq = platform_get_irq(pdev, 0);
125 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
129 addr = devm_ioremap(&pdev->dev, res->start, 4096);
133 __raw_writel(PAGE_NAME, addr + REG_SET_PAGE);
134 keymapnamelen = __raw_readl(addr + REG_LEN);
136 edev = devm_kzalloc(&pdev->dev,
137 sizeof(struct event_dev) + keymapnamelen + 1,
142 input_dev = devm_input_allocate_device(&pdev->dev);
146 edev->input = input_dev;
150 for (i = 0; i < keymapnamelen; i++)
151 edev->name[i] = __raw_readb(edev->addr + REG_DATA + i);
153 pr_debug("events_probe() keymap=%s\n", edev->name);
155 input_dev->name = edev->name;
156 input_dev->id.bustype = BUS_HOST;
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);
168 events_import_abs_params(edev);
170 error = devm_request_irq(&pdev->dev, edev->irq, events_interrupt, 0,
171 "goldfish-events-keypad", edev);
175 error = input_register_device(input_dev);
182 static struct platform_driver events_driver = {
183 .probe = events_probe,
185 .owner = THIS_MODULE,
186 .name = "goldfish_events",
190 module_platform_driver(events_driver);
192 MODULE_AUTHOR("Brian Swetland");
193 MODULE_DESCRIPTION("Goldfish Event Device");
194 MODULE_LICENSE("GPL");