1 files changed, 250 insertions, 0 deletions
diff --git a/drivers/input/mouse/pxa930_trkball.c b/drivers/input/mouse/pxa930_trkball.c
new file mode 100644
index 000000000..f04ba12db
--- /dev/null
+++ b/drivers/input/mouse/pxa930_trkball.c
@@ -0,0 +1,250 @@
+// 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");