+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * PXA930 track ball mouse driver
- *
- * Copyright (C) 2007 Marvell International Ltd.
- * 2008-02-28: Yong Yao <yaoyong@marvell.com>
- * initial version
- */
-
-#include <linux/input.h>
-#include <linux/interrupt.h>
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/delay.h>
-#include <linux/io.h>
-#include <linux/slab.h>
-
-#include <linux/platform_data/mouse-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 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)
- 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 = dev_get_platdata(&pdev->dev);
- if (!trkball->pdata) {
- dev_err(&pdev->dev, "no platform data defined\n");
- error = -EINVAL;
- goto failed;
- }
-
- trkball->mmio_base = ioremap(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, 0,
- 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 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 = pxa930_trkball_remove,
-};
-module_platform_driver(pxa930_trkball_driver);
-
-MODULE_AUTHOR("Yong Yao <yaoyong@marvell.com>");
-MODULE_DESCRIPTION("PXA930 Trackball Mouse Driver");
-MODULE_LICENSE("GPL");
projects / platform / kernel / linux-rpi.git / commitdiff