270 lines
6.5 KiB
C
270 lines
6.5 KiB
C
/*
|
|
* PXA930 track ball mouse driver
|
|
*
|
|
* Copyright (C) 2007 Marvell International Ltd.
|
|
* 2008-02-28: Yong Yao <yaoyong@marvell.com>
|
|
* initial version
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/input.h>
|
|
#include <linux/version.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/io.h>
|
|
|
|
#include <mach/hardware.h>
|
|
#include <mach/pxa930_trkball.h>
|
|
|
|
/* Trackball Controller Register Definitions */
|
|
#define TBCR (0x000C)
|
|
#define TBCNTR (0x0010)
|
|
#define TBSBC (0x0014)
|
|
|
|
#define TBCR_TBRST (1 << 1)
|
|
#define TBCR_TBSB (1 << 10)
|
|
|
|
#define TBCR_Y_FLT(n) (((n) & 0xf) << 6)
|
|
#define TBCR_X_FLT(n) (((n) & 0xf) << 2)
|
|
|
|
#define TBCNTR_YM(n) (((n) >> 24) & 0xff)
|
|
#define TBCNTR_YP(n) (((n) >> 16) & 0xff)
|
|
#define TBCNTR_XM(n) (((n) >> 8) & 0xff)
|
|
#define TBCNTR_XP(n) ((n) & 0xff)
|
|
|
|
#define TBSBC_TBSBC (0x1)
|
|
|
|
struct pxa930_trkball {
|
|
struct pxa930_trkball_platform_data *pdata;
|
|
|
|
/* Memory Mapped Register */
|
|
struct resource *mem;
|
|
void __iomem *mmio_base;
|
|
|
|
struct input_dev *input;
|
|
};
|
|
|
|
static irqreturn_t pxa930_trkball_interrupt(int irq, void *dev_id)
|
|
{
|
|
struct pxa930_trkball *trkball = dev_id;
|
|
struct input_dev *input = trkball->input;
|
|
int tbcntr, x, y;
|
|
|
|
/* According to the spec software must read TBCNTR twice:
|
|
* if the read value is the same, the reading is valid
|
|
*/
|
|
tbcntr = __raw_readl(trkball->mmio_base + TBCNTR);
|
|
|
|
if (tbcntr == __raw_readl(trkball->mmio_base + TBCNTR)) {
|
|
x = (TBCNTR_XP(tbcntr) - TBCNTR_XM(tbcntr)) / 2;
|
|
y = (TBCNTR_YP(tbcntr) - TBCNTR_YM(tbcntr)) / 2;
|
|
|
|
input_report_rel(input, REL_X, x);
|
|
input_report_rel(input, REL_Y, y);
|
|
input_sync(input);
|
|
}
|
|
|
|
__raw_writel(TBSBC_TBSBC, trkball->mmio_base + TBSBC);
|
|
__raw_writel(0, trkball->mmio_base + TBSBC);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/* For TBCR, we need to wait for a while to make sure it has been modified. */
|
|
static int write_tbcr(struct pxa930_trkball *trkball, int v)
|
|
{
|
|
int i = 100;
|
|
|
|
__raw_writel(v, trkball->mmio_base + TBCR);
|
|
|
|
while (--i) {
|
|
if (__raw_readl(trkball->mmio_base + TBCR) == v)
|
|
break;
|
|
msleep(1);
|
|
}
|
|
|
|
if (i == 0) {
|
|
pr_err("%s: timed out writing TBCR(%x)!\n", __func__, v);
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void pxa930_trkball_config(struct pxa930_trkball *trkball)
|
|
{
|
|
uint32_t tbcr;
|
|
|
|
/* According to spec, need to write the filters of x,y to 0xf first! */
|
|
tbcr = __raw_readl(trkball->mmio_base + TBCR);
|
|
write_tbcr(trkball, tbcr | TBCR_X_FLT(0xf) | TBCR_Y_FLT(0xf));
|
|
write_tbcr(trkball, TBCR_X_FLT(trkball->pdata->x_filter) |
|
|
TBCR_Y_FLT(trkball->pdata->y_filter));
|
|
|
|
/* According to spec, set TBCR_TBRST first, before clearing it! */
|
|
tbcr = __raw_readl(trkball->mmio_base + TBCR);
|
|
write_tbcr(trkball, tbcr | TBCR_TBRST);
|
|
write_tbcr(trkball, tbcr & ~TBCR_TBRST);
|
|
|
|
__raw_writel(TBSBC_TBSBC, trkball->mmio_base + TBSBC);
|
|
__raw_writel(0, trkball->mmio_base + TBSBC);
|
|
|
|
pr_debug("%s: final TBCR=%x!\n", __func__,
|
|
__raw_readl(trkball->mmio_base + TBCR));
|
|
}
|
|
|
|
static int pxa930_trkball_open(struct input_dev *dev)
|
|
{
|
|
struct pxa930_trkball *trkball = input_get_drvdata(dev);
|
|
|
|
pxa930_trkball_config(trkball);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void pxa930_trkball_disable(struct pxa930_trkball *trkball)
|
|
{
|
|
uint32_t tbcr = __raw_readl(trkball->mmio_base + TBCR);
|
|
|
|
/* Held in reset, gate the 32-KHz input clock off */
|
|
write_tbcr(trkball, tbcr | TBCR_TBRST);
|
|
}
|
|
|
|
static void pxa930_trkball_close(struct input_dev *dev)
|
|
{
|
|
struct pxa930_trkball *trkball = input_get_drvdata(dev);
|
|
|
|
pxa930_trkball_disable(trkball);
|
|
}
|
|
|
|
static int __devinit pxa930_trkball_probe(struct platform_device *pdev)
|
|
{
|
|
struct pxa930_trkball *trkball;
|
|
struct input_dev *input;
|
|
struct resource *res;
|
|
int irq, error;
|
|
|
|
irq = platform_get_irq(pdev, 0);
|
|
if (irq < 0) {
|
|
dev_err(&pdev->dev, "failed to get trkball irq\n");
|
|
return -ENXIO;
|
|
}
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!res) {
|
|
dev_err(&pdev->dev, "failed to get register memory\n");
|
|
return -ENXIO;
|
|
}
|
|
|
|
trkball = kzalloc(sizeof(struct pxa930_trkball), GFP_KERNEL);
|
|
if (!trkball)
|
|
return -ENOMEM;
|
|
|
|
trkball->pdata = pdev->dev.platform_data;
|
|
if (!trkball->pdata) {
|
|
dev_err(&pdev->dev, "no platform data defined\n");
|
|
error = -EINVAL;
|
|
goto failed;
|
|
}
|
|
|
|
trkball->mmio_base = ioremap_nocache(res->start, resource_size(res));
|
|
if (!trkball->mmio_base) {
|
|
dev_err(&pdev->dev, "failed to ioremap registers\n");
|
|
error = -ENXIO;
|
|
goto failed;
|
|
}
|
|
|
|
/* held the module in reset, will be enabled in open() */
|
|
pxa930_trkball_disable(trkball);
|
|
|
|
error = request_irq(irq, pxa930_trkball_interrupt, IRQF_DISABLED,
|
|
pdev->name, trkball);
|
|
if (error) {
|
|
dev_err(&pdev->dev, "failed to request irq: %d\n", error);
|
|
goto failed_free_io;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, trkball);
|
|
|
|
input = input_allocate_device();
|
|
if (!input) {
|
|
dev_err(&pdev->dev, "failed to allocate input device\n");
|
|
error = -ENOMEM;
|
|
goto failed_free_irq;
|
|
}
|
|
|
|
input->name = pdev->name;
|
|
input->id.bustype = BUS_HOST;
|
|
input->open = pxa930_trkball_open;
|
|
input->close = pxa930_trkball_close;
|
|
input->dev.parent = &pdev->dev;
|
|
input_set_drvdata(input, trkball);
|
|
|
|
trkball->input = input;
|
|
|
|
input_set_capability(input, EV_REL, REL_X);
|
|
input_set_capability(input, EV_REL, REL_Y);
|
|
|
|
error = input_register_device(input);
|
|
if (error) {
|
|
dev_err(&pdev->dev, "unable to register input device\n");
|
|
goto failed_free_input;
|
|
}
|
|
|
|
return 0;
|
|
|
|
failed_free_input:
|
|
input_free_device(input);
|
|
failed_free_irq:
|
|
free_irq(irq, trkball);
|
|
failed_free_io:
|
|
iounmap(trkball->mmio_base);
|
|
failed:
|
|
kfree(trkball);
|
|
return error;
|
|
}
|
|
|
|
static int __devexit pxa930_trkball_remove(struct platform_device *pdev)
|
|
{
|
|
struct pxa930_trkball *trkball = platform_get_drvdata(pdev);
|
|
int irq = platform_get_irq(pdev, 0);
|
|
|
|
input_unregister_device(trkball->input);
|
|
free_irq(irq, trkball);
|
|
iounmap(trkball->mmio_base);
|
|
kfree(trkball);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver pxa930_trkball_driver = {
|
|
.driver = {
|
|
.name = "pxa930-trkball",
|
|
},
|
|
.probe = pxa930_trkball_probe,
|
|
.remove = __devexit_p(pxa930_trkball_remove),
|
|
};
|
|
|
|
static int __init pxa930_trkball_init(void)
|
|
{
|
|
return platform_driver_register(&pxa930_trkball_driver);
|
|
}
|
|
|
|
static void __exit pxa930_trkball_exit(void)
|
|
{
|
|
platform_driver_unregister(&pxa930_trkball_driver);
|
|
}
|
|
|
|
module_init(pxa930_trkball_init);
|
|
module_exit(pxa930_trkball_exit);
|
|
|
|
MODULE_AUTHOR("Yong Yao <yaoyong@marvell.com>");
|
|
MODULE_DESCRIPTION("PXA930 Trackball Mouse Driver");
|
|
MODULE_LICENSE("GPL");
|