goldfish_events.c
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/*
* Copyright (C) 2007 Google, Inc.
* Copyright (C) 2012 Intel, Inc.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/types.h>
#include <linux/input.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/irq.h>
#include <linux/io.h>
enum {
REG_READ = 0x00,
REG_SET_PAGE = 0x00,
REG_LEN = 0x04,
REG_DATA = 0x08,
PAGE_NAME = 0x00000,
PAGE_EVBITS = 0x10000,
PAGE_ABSDATA = 0x20000 | EV_ABS,
};
struct event_dev {
struct input_dev *input;
int irq;
void __iomem *addr;
char name[0];
};
static irqreturn_t events_interrupt(int irq, void *dev_id)
{
struct event_dev *edev = dev_id;
unsigned type, code, value;
type = __raw_readl(edev->addr + REG_READ);
code = __raw_readl(edev->addr + REG_READ);
value = __raw_readl(edev->addr + REG_READ);
input_event(edev->input, type, code, value);
input_sync(edev->input);
return IRQ_HANDLED;
}
static void events_import_bits(struct event_dev *edev,
unsigned long bits[], unsigned type, size_t count)
{
void __iomem *addr = edev->addr;
int i, j;
size_t size;
uint8_t val;
__raw_writel(PAGE_EVBITS | type, addr + REG_SET_PAGE);
size = __raw_readl(addr + REG_LEN) * 8;
if (size < count)
count = size;
addr += REG_DATA;
for (i = 0; i < count; i += 8) {
val = __raw_readb(addr++);
for (j = 0; j < 8; j++)
if (val & 1 << j)
set_bit(i + j, bits);
}
}
static void events_import_abs_params(struct event_dev *edev)
{
struct input_dev *input_dev = edev->input;
void __iomem *addr = edev->addr;
u32 val[4];
int count;
int i, j;
__raw_writel(PAGE_ABSDATA, addr + REG_SET_PAGE);
count = __raw_readl(addr + REG_LEN) / sizeof(val);
if (count > ABS_MAX)
count = ABS_MAX;
for (i = 0; i < count; i++) {
if (!test_bit(i, input_dev->absbit))
continue;
for (j = 0; j < ARRAY_SIZE(val); j++) {
int offset = (i * ARRAY_SIZE(val) + j) * sizeof(u32);
val[j] = __raw_readl(edev->addr + REG_DATA + offset);
}
input_set_abs_params(input_dev, i,
val[0], val[1], val[2], val[3]);
}
}
static int events_probe(struct platform_device *pdev)
{
struct input_dev *input_dev;
struct event_dev *edev;
struct resource *res;
unsigned keymapnamelen;
void __iomem *addr;
int irq;
int i;
int error;
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return -EINVAL;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -EINVAL;
addr = devm_ioremap(&pdev->dev, res->start, 4096);
if (!addr)
return -ENOMEM;
__raw_writel(PAGE_NAME, addr + REG_SET_PAGE);
keymapnamelen = __raw_readl(addr + REG_LEN);
edev = devm_kzalloc(&pdev->dev,
sizeof(struct event_dev) + keymapnamelen + 1,
GFP_KERNEL);
if (!edev)
return -ENOMEM;
input_dev = devm_input_allocate_device(&pdev->dev);
if (!input_dev)
return -ENOMEM;
edev->input = input_dev;
edev->addr = addr;
edev->irq = irq;
for (i = 0; i < keymapnamelen; i++)
edev->name[i] = __raw_readb(edev->addr + REG_DATA + i);
pr_debug("events_probe() keymap=%s\n", edev->name);
input_dev->name = edev->name;
input_dev->id.bustype = BUS_HOST;
events_import_bits(edev, input_dev->evbit, EV_SYN, EV_MAX);
events_import_bits(edev, input_dev->keybit, EV_KEY, KEY_MAX);
events_import_bits(edev, input_dev->relbit, EV_REL, REL_MAX);
events_import_bits(edev, input_dev->absbit, EV_ABS, ABS_MAX);
events_import_bits(edev, input_dev->mscbit, EV_MSC, MSC_MAX);
events_import_bits(edev, input_dev->ledbit, EV_LED, LED_MAX);
events_import_bits(edev, input_dev->sndbit, EV_SND, SND_MAX);
events_import_bits(edev, input_dev->ffbit, EV_FF, FF_MAX);
events_import_bits(edev, input_dev->swbit, EV_SW, SW_MAX);
events_import_abs_params(edev);
error = devm_request_irq(&pdev->dev, edev->irq, events_interrupt, 0,
"goldfish-events-keypad", edev);
if (error)
return error;
error = input_register_device(input_dev);
if (error)
return error;
return 0;
}
static struct platform_driver events_driver = {
.probe = events_probe,
.driver = {
.name = "goldfish_events",
},
};
module_platform_driver(events_driver);
MODULE_AUTHOR("Brian Swetland");
MODULE_DESCRIPTION("Goldfish Event Device");
MODULE_LICENSE("GPL");