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linux-next/drivers/input/keyboard/goldfish_events.c
Thomas Gleixner 9c92ab6191 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 285 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190529141900.642774971@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-05 17:36:37 +02:00

202 lines
4.7 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2007 Google, Inc.
* Copyright (C) 2012 Intel, Inc.
*/
#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>
#include <linux/acpi.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 int 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 int 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 int 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("%s: keymap=%s\n", __func__, 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 const struct of_device_id goldfish_events_of_match[] = {
{ .compatible = "google,goldfish-events-keypad", },
{},
};
MODULE_DEVICE_TABLE(of, goldfish_events_of_match);
#ifdef CONFIG_ACPI
static const struct acpi_device_id goldfish_events_acpi_match[] = {
{ "GFSH0002", 0 },
{ },
};
MODULE_DEVICE_TABLE(acpi, goldfish_events_acpi_match);
#endif
static struct platform_driver events_driver = {
.probe = events_probe,
.driver = {
.name = "goldfish_events",
.of_match_table = goldfish_events_of_match,
.acpi_match_table = ACPI_PTR(goldfish_events_acpi_match),
},
};
module_platform_driver(events_driver);
MODULE_AUTHOR("Brian Swetland");
MODULE_DESCRIPTION("Goldfish Event Device");
MODULE_LICENSE("GPL");