Input: add support for trackball on pxa930 and pxa935 (105ca239) · Commits · e / devices / android_kernel_sony_msm8994

arch/arm/mach-pxa/include/mach/pxa930_trkball.h

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+10 −0

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		#ifndef __ASM_ARCH_PXA930_TRKBALL_H
		#define __ASM_ARCH_PXA930_TRKBALL_H

		struct pxa930_trkball_platform_data {
		int x_filter;
		int y_filter;
		};

		#endif /* __ASM_ARCH_PXA930_TRKBALL_H */

drivers/input/mouse/Kconfig

+6 −0

Original line number	Diff line number	Diff line
		@@ -286,4 +286,10 @@ config MOUSE_GPIO
		To compile this driver as a module, choose M here: the
		module will be called gpio_mouse.

		config MOUSE_PXA930_TRKBALL
		tristate "PXA930 Trackball mouse"
		depends on CPU_PXA930 \|\| CPU_PXA935
		help
		Say Y here to support PXA930 Trackball mouse.

		endif

drivers/input/mouse/Makefile

+14 −13

Original line number	Diff line number	Diff line
		@@ -13,6 +13,7 @@ obj-$(CONFIG_MOUSE_INPORT) += inport.o
		obj-$(CONFIG_MOUSE_LOGIBM) += logibm.o
		obj-$(CONFIG_MOUSE_PC110PAD) += pc110pad.o
		obj-$(CONFIG_MOUSE_PS2) += psmouse.o
		obj-$(CONFIG_MOUSE_PXA930_TRKBALL) += pxa930_trkball.o
		obj-$(CONFIG_MOUSE_SERIAL) += sermouse.o
		obj-$(CONFIG_MOUSE_HIL) += hil_ptr.o
		obj-$(CONFIG_MOUSE_VSXXXAA) += vsxxxaa.o

drivers/input/mouse/pxa930_trkball.c

0 → 100644

+269 −0

Original line number	Diff line number	Diff line
		/*
		* 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", ret);
		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 ret;
		}

		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");