1 files changed, 269 insertions, 0 deletions

diff --git a/drivers/input/mouse/pxa930_trkball.c b/drivers/input/mouse/pxa930_trkball.c
new file mode 100644
index 000000000000..a0f45c4fc198
--- /dev/null
+++ b/drivers/input/mouse/pxa930_trkball.c
@@ -0,0 +1,269 @@
+/*
+ * 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");