346 строки
7.8 KiB
C
346 строки
7.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Support for the four N64 controllers.
|
|
*
|
|
* Copyright (c) 2021 Lauri Kasanen
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/errno.h>
|
|
#include <linux/init.h>
|
|
#include <linux/input.h>
|
|
#include <linux/limits.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/timer.h>
|
|
|
|
MODULE_AUTHOR("Lauri Kasanen <cand@gmx.com>");
|
|
MODULE_DESCRIPTION("Driver for N64 controllers");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
#define PIF_RAM 0x1fc007c0
|
|
|
|
#define SI_DRAM_REG 0
|
|
#define SI_READ_REG 1
|
|
#define SI_WRITE_REG 4
|
|
#define SI_STATUS_REG 6
|
|
|
|
#define SI_STATUS_DMA_BUSY BIT(0)
|
|
#define SI_STATUS_IO_BUSY BIT(1)
|
|
|
|
#define N64_CONTROLLER_ID 0x0500
|
|
|
|
#define MAX_CONTROLLERS 4
|
|
|
|
static const char *n64joy_phys[MAX_CONTROLLERS] = {
|
|
"n64joy/port0",
|
|
"n64joy/port1",
|
|
"n64joy/port2",
|
|
"n64joy/port3",
|
|
};
|
|
|
|
struct n64joy_priv {
|
|
u64 si_buf[8] ____cacheline_aligned;
|
|
struct timer_list timer;
|
|
struct mutex n64joy_mutex;
|
|
struct input_dev *n64joy_dev[MAX_CONTROLLERS];
|
|
u32 __iomem *reg_base;
|
|
u8 n64joy_opened;
|
|
};
|
|
|
|
struct joydata {
|
|
unsigned int: 16; /* unused */
|
|
unsigned int err: 2;
|
|
unsigned int: 14; /* unused */
|
|
|
|
union {
|
|
u32 data;
|
|
|
|
struct {
|
|
unsigned int a: 1;
|
|
unsigned int b: 1;
|
|
unsigned int z: 1;
|
|
unsigned int start: 1;
|
|
unsigned int up: 1;
|
|
unsigned int down: 1;
|
|
unsigned int left: 1;
|
|
unsigned int right: 1;
|
|
unsigned int: 2; /* unused */
|
|
unsigned int l: 1;
|
|
unsigned int r: 1;
|
|
unsigned int c_up: 1;
|
|
unsigned int c_down: 1;
|
|
unsigned int c_left: 1;
|
|
unsigned int c_right: 1;
|
|
signed int x: 8;
|
|
signed int y: 8;
|
|
};
|
|
};
|
|
};
|
|
|
|
static void n64joy_write_reg(u32 __iomem *reg_base, const u8 reg, const u32 value)
|
|
{
|
|
writel(value, reg_base + reg);
|
|
}
|
|
|
|
static u32 n64joy_read_reg(u32 __iomem *reg_base, const u8 reg)
|
|
{
|
|
return readl(reg_base + reg);
|
|
}
|
|
|
|
static void n64joy_wait_si_dma(u32 __iomem *reg_base)
|
|
{
|
|
while (n64joy_read_reg(reg_base, SI_STATUS_REG) &
|
|
(SI_STATUS_DMA_BUSY | SI_STATUS_IO_BUSY))
|
|
cpu_relax();
|
|
}
|
|
|
|
static void n64joy_exec_pif(struct n64joy_priv *priv, const u64 in[8])
|
|
{
|
|
unsigned long flags;
|
|
|
|
dma_cache_wback_inv((unsigned long) in, 8 * 8);
|
|
dma_cache_inv((unsigned long) priv->si_buf, 8 * 8);
|
|
|
|
local_irq_save(flags);
|
|
|
|
n64joy_wait_si_dma(priv->reg_base);
|
|
|
|
barrier();
|
|
n64joy_write_reg(priv->reg_base, SI_DRAM_REG, virt_to_phys(in));
|
|
barrier();
|
|
n64joy_write_reg(priv->reg_base, SI_WRITE_REG, PIF_RAM);
|
|
barrier();
|
|
|
|
n64joy_wait_si_dma(priv->reg_base);
|
|
|
|
barrier();
|
|
n64joy_write_reg(priv->reg_base, SI_DRAM_REG, virt_to_phys(priv->si_buf));
|
|
barrier();
|
|
n64joy_write_reg(priv->reg_base, SI_READ_REG, PIF_RAM);
|
|
barrier();
|
|
|
|
n64joy_wait_si_dma(priv->reg_base);
|
|
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
static const u64 polldata[] ____cacheline_aligned = {
|
|
0xff010401ffffffff,
|
|
0xff010401ffffffff,
|
|
0xff010401ffffffff,
|
|
0xff010401ffffffff,
|
|
0xfe00000000000000,
|
|
0,
|
|
0,
|
|
1
|
|
};
|
|
|
|
static void n64joy_poll(struct timer_list *t)
|
|
{
|
|
const struct joydata *data;
|
|
struct n64joy_priv *priv = container_of(t, struct n64joy_priv, timer);
|
|
struct input_dev *dev;
|
|
u32 i;
|
|
|
|
n64joy_exec_pif(priv, polldata);
|
|
|
|
data = (struct joydata *) priv->si_buf;
|
|
|
|
for (i = 0; i < MAX_CONTROLLERS; i++) {
|
|
if (!priv->n64joy_dev[i])
|
|
continue;
|
|
|
|
dev = priv->n64joy_dev[i];
|
|
|
|
/* d-pad */
|
|
input_report_key(dev, BTN_DPAD_UP, data[i].up);
|
|
input_report_key(dev, BTN_DPAD_DOWN, data[i].down);
|
|
input_report_key(dev, BTN_DPAD_LEFT, data[i].left);
|
|
input_report_key(dev, BTN_DPAD_RIGHT, data[i].right);
|
|
|
|
/* c buttons */
|
|
input_report_key(dev, BTN_FORWARD, data[i].c_up);
|
|
input_report_key(dev, BTN_BACK, data[i].c_down);
|
|
input_report_key(dev, BTN_LEFT, data[i].c_left);
|
|
input_report_key(dev, BTN_RIGHT, data[i].c_right);
|
|
|
|
/* matching buttons */
|
|
input_report_key(dev, BTN_START, data[i].start);
|
|
input_report_key(dev, BTN_Z, data[i].z);
|
|
|
|
/* remaining ones: a, b, l, r */
|
|
input_report_key(dev, BTN_0, data[i].a);
|
|
input_report_key(dev, BTN_1, data[i].b);
|
|
input_report_key(dev, BTN_2, data[i].l);
|
|
input_report_key(dev, BTN_3, data[i].r);
|
|
|
|
input_report_abs(dev, ABS_X, data[i].x);
|
|
input_report_abs(dev, ABS_Y, data[i].y);
|
|
|
|
input_sync(dev);
|
|
}
|
|
|
|
mod_timer(&priv->timer, jiffies + msecs_to_jiffies(16));
|
|
}
|
|
|
|
static int n64joy_open(struct input_dev *dev)
|
|
{
|
|
struct n64joy_priv *priv = input_get_drvdata(dev);
|
|
int err;
|
|
|
|
err = mutex_lock_interruptible(&priv->n64joy_mutex);
|
|
if (err)
|
|
return err;
|
|
|
|
if (!priv->n64joy_opened) {
|
|
/*
|
|
* We could use the vblank irq, but it's not important if
|
|
* the poll point slightly changes.
|
|
*/
|
|
timer_setup(&priv->timer, n64joy_poll, 0);
|
|
mod_timer(&priv->timer, jiffies + msecs_to_jiffies(16));
|
|
}
|
|
|
|
priv->n64joy_opened++;
|
|
|
|
mutex_unlock(&priv->n64joy_mutex);
|
|
return err;
|
|
}
|
|
|
|
static void n64joy_close(struct input_dev *dev)
|
|
{
|
|
struct n64joy_priv *priv = input_get_drvdata(dev);
|
|
|
|
mutex_lock(&priv->n64joy_mutex);
|
|
if (!--priv->n64joy_opened)
|
|
del_timer_sync(&priv->timer);
|
|
mutex_unlock(&priv->n64joy_mutex);
|
|
}
|
|
|
|
static const u64 __initconst scandata[] ____cacheline_aligned = {
|
|
0xff010300ffffffff,
|
|
0xff010300ffffffff,
|
|
0xff010300ffffffff,
|
|
0xff010300ffffffff,
|
|
0xfe00000000000000,
|
|
0,
|
|
0,
|
|
1
|
|
};
|
|
|
|
/*
|
|
* The target device is embedded and RAM-constrained. We save RAM
|
|
* by initializing in __init code that gets dropped late in boot.
|
|
* For the same reason there is no module or unloading support.
|
|
*/
|
|
static int __init n64joy_probe(struct platform_device *pdev)
|
|
{
|
|
const struct joydata *data;
|
|
struct n64joy_priv *priv;
|
|
struct input_dev *dev;
|
|
int err = 0;
|
|
u32 i, j, found = 0;
|
|
|
|
priv = kzalloc(sizeof(struct n64joy_priv), GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
mutex_init(&priv->n64joy_mutex);
|
|
|
|
priv->reg_base = devm_platform_ioremap_resource(pdev, 0);
|
|
if (IS_ERR(priv->reg_base)) {
|
|
err = PTR_ERR(priv->reg_base);
|
|
goto fail;
|
|
}
|
|
|
|
/* The controllers are not hotpluggable, so we can scan in init */
|
|
n64joy_exec_pif(priv, scandata);
|
|
|
|
data = (struct joydata *) priv->si_buf;
|
|
|
|
for (i = 0; i < MAX_CONTROLLERS; i++) {
|
|
if (!data[i].err && data[i].data >> 16 == N64_CONTROLLER_ID) {
|
|
found++;
|
|
|
|
dev = priv->n64joy_dev[i] = input_allocate_device();
|
|
if (!priv->n64joy_dev[i]) {
|
|
err = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
input_set_drvdata(dev, priv);
|
|
|
|
dev->name = "N64 controller";
|
|
dev->phys = n64joy_phys[i];
|
|
dev->id.bustype = BUS_HOST;
|
|
dev->id.vendor = 0;
|
|
dev->id.product = data[i].data >> 16;
|
|
dev->id.version = 0;
|
|
dev->dev.parent = &pdev->dev;
|
|
|
|
dev->open = n64joy_open;
|
|
dev->close = n64joy_close;
|
|
|
|
/* d-pad */
|
|
input_set_capability(dev, EV_KEY, BTN_DPAD_UP);
|
|
input_set_capability(dev, EV_KEY, BTN_DPAD_DOWN);
|
|
input_set_capability(dev, EV_KEY, BTN_DPAD_LEFT);
|
|
input_set_capability(dev, EV_KEY, BTN_DPAD_RIGHT);
|
|
/* c buttons */
|
|
input_set_capability(dev, EV_KEY, BTN_LEFT);
|
|
input_set_capability(dev, EV_KEY, BTN_RIGHT);
|
|
input_set_capability(dev, EV_KEY, BTN_FORWARD);
|
|
input_set_capability(dev, EV_KEY, BTN_BACK);
|
|
/* matching buttons */
|
|
input_set_capability(dev, EV_KEY, BTN_START);
|
|
input_set_capability(dev, EV_KEY, BTN_Z);
|
|
/* remaining ones: a, b, l, r */
|
|
input_set_capability(dev, EV_KEY, BTN_0);
|
|
input_set_capability(dev, EV_KEY, BTN_1);
|
|
input_set_capability(dev, EV_KEY, BTN_2);
|
|
input_set_capability(dev, EV_KEY, BTN_3);
|
|
|
|
for (j = 0; j < 2; j++)
|
|
input_set_abs_params(dev, ABS_X + j,
|
|
S8_MIN, S8_MAX, 0, 0);
|
|
|
|
err = input_register_device(dev);
|
|
if (err) {
|
|
input_free_device(dev);
|
|
goto fail;
|
|
}
|
|
}
|
|
}
|
|
|
|
pr_info("%u controller(s) connected\n", found);
|
|
|
|
if (!found)
|
|
return -ENODEV;
|
|
|
|
return 0;
|
|
fail:
|
|
for (i = 0; i < MAX_CONTROLLERS; i++) {
|
|
if (!priv->n64joy_dev[i])
|
|
continue;
|
|
input_unregister_device(priv->n64joy_dev[i]);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static struct platform_driver n64joy_driver = {
|
|
.driver = {
|
|
.name = "n64joy",
|
|
},
|
|
};
|
|
|
|
static int __init n64joy_init(void)
|
|
{
|
|
return platform_driver_probe(&n64joy_driver, n64joy_probe);
|
|
}
|
|
|
|
module_init(n64joy_init);
|