Commit 6f2ac009 authored by Brian Swetland's avatar Brian Swetland Committed by Dmitry Torokhov

Input: goldfish - virtual input event driver

This device is a direct pipe from "hardware" to the input event subsystem,
allowing us to avoid having to route "keypad" style events through an
AT keyboard driver (gross!).

As with the other submissions this driver is cross architecture.
Signed-off-by: default avatarMike A. Chan <mikechan@google.com>
[Tided up to work on x86]
Signed-off-by: default avatarSheng Yang <sheng@linux.intel.com>
Signed-off-by: default avatarYunhong Jiang <yunhong.jiang@intel.com>
Signed-off-by: default avatarXiaohui Xin <xiaohui.xin@intel.com>
Signed-off-by: default avatarJun Nakajima <jun.nakajima@intel.com>
Signed-off-by: default avatarBruce Beare <bruce.j.beare@intel.com>
[Ported to 3.4]
Signed-off-by: default avatarTom Keel <thomas.keel@intel.com>
[Cleaned up for 3.7 and submission]
Signed-off-by: default avatarAlan Cox <alan@linux.intel.com>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent cb696e7c
...@@ -479,6 +479,16 @@ config KEYBOARD_SAMSUNG ...@@ -479,6 +479,16 @@ config KEYBOARD_SAMSUNG
To compile this driver as a module, choose M here: the To compile this driver as a module, choose M here: the
module will be called samsung-keypad. module will be called samsung-keypad.
config KEYBOARD_GOLDFISH_EVENTS
depends on GOLDFISH
tristate "Generic Input Event device for Goldfish"
help
Say Y here to get an input event device for the Goldfish virtual
device emulator.
To compile this driver as a module, choose M here: the
module will be called goldfish-events.
config KEYBOARD_STOWAWAY config KEYBOARD_STOWAWAY
tristate "Stowaway keyboard" tristate "Stowaway keyboard"
select SERIO select SERIO
......
...@@ -13,6 +13,7 @@ obj-$(CONFIG_KEYBOARD_ATKBD) += atkbd.o ...@@ -13,6 +13,7 @@ obj-$(CONFIG_KEYBOARD_ATKBD) += atkbd.o
obj-$(CONFIG_KEYBOARD_BFIN) += bf54x-keys.o obj-$(CONFIG_KEYBOARD_BFIN) += bf54x-keys.o
obj-$(CONFIG_KEYBOARD_DAVINCI) += davinci_keyscan.o obj-$(CONFIG_KEYBOARD_DAVINCI) += davinci_keyscan.o
obj-$(CONFIG_KEYBOARD_EP93XX) += ep93xx_keypad.o obj-$(CONFIG_KEYBOARD_EP93XX) += ep93xx_keypad.o
obj-$(CONFIG_KEYBOARD_GOLDFISH_EVENTS) += goldfish_events.o
obj-$(CONFIG_KEYBOARD_GPIO) += gpio_keys.o obj-$(CONFIG_KEYBOARD_GPIO) += gpio_keys.o
obj-$(CONFIG_KEYBOARD_GPIO_POLLED) += gpio_keys_polled.o obj-$(CONFIG_KEYBOARD_GPIO_POLLED) += gpio_keys_polled.o
obj-$(CONFIG_KEYBOARD_TCA6416) += tca6416-keypad.o obj-$(CONFIG_KEYBOARD_TCA6416) += tca6416-keypad.o
......
/*
* 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/init.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 = {
.owner = THIS_MODULE,
.name = "goldfish_events",
},
};
module_platform_driver(events_driver);
MODULE_AUTHOR("Brian Swetland");
MODULE_DESCRIPTION("Goldfish Event Device");
MODULE_LICENSE("GPL");
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