--- /dev/null
+/*
+ * Driver for the enhanced rotary controller on pxa930 and pxa935
+ *
+ * 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/kernel.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+
+#include <linux/platform_data/keyboard-pxa930_rotary.h>
+
+#define SBCR (0x04)
+#define ERCR (0x0c)
+
+#define SBCR_ERSB (1 << 5)
+
+struct pxa930_rotary {
+ struct input_dev *input_dev;
+ void __iomem *mmio_base;
+ int last_ercr;
+
+ struct pxa930_rotary_platform_data *pdata;
+};
+
+static void clear_sbcr(struct pxa930_rotary *r)
+{
+ uint32_t sbcr = __raw_readl(r->mmio_base + SBCR);
+
+ __raw_writel(sbcr | SBCR_ERSB, r->mmio_base + SBCR);
+ __raw_writel(sbcr & ~SBCR_ERSB, r->mmio_base + SBCR);
+}
+
+static irqreturn_t rotary_irq(int irq, void *dev_id)
+{
+ struct pxa930_rotary *r = dev_id;
+ struct pxa930_rotary_platform_data *pdata = r->pdata;
+ int ercr, delta, key;
+
+ ercr = __raw_readl(r->mmio_base + ERCR) & 0xf;
+ clear_sbcr(r);
+
+ delta = ercr - r->last_ercr;
+ if (delta == 0)
+ return IRQ_HANDLED;
+
+ r->last_ercr = ercr;
+
+ if (pdata->up_key && pdata->down_key) {
+ key = (delta > 0) ? pdata->up_key : pdata->down_key;
+ input_report_key(r->input_dev, key, 1);
+ input_sync(r->input_dev);
+ input_report_key(r->input_dev, key, 0);
+ } else
+ input_report_rel(r->input_dev, pdata->rel_code, delta);
+
+ input_sync(r->input_dev);
+
+ return IRQ_HANDLED;
+}
+
+static int pxa930_rotary_open(struct input_dev *dev)
+{
+ struct pxa930_rotary *r = input_get_drvdata(dev);
+
+ clear_sbcr(r);
+
+ return 0;
+}
+
+static void pxa930_rotary_close(struct input_dev *dev)
+{
+ struct pxa930_rotary *r = input_get_drvdata(dev);
+
+ clear_sbcr(r);
+}
+
+static int pxa930_rotary_probe(struct platform_device *pdev)
+{
+ struct pxa930_rotary_platform_data *pdata =
+ dev_get_platdata(&pdev->dev);
+ struct pxa930_rotary *r;
+ struct input_dev *input_dev;
+ struct resource *res;
+ int irq;
+ int err;
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ dev_err(&pdev->dev, "no irq for rotary controller\n");
+ return -ENXIO;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "no I/O memory defined\n");
+ return -ENXIO;
+ }
+
+ if (!pdata) {
+ dev_err(&pdev->dev, "no platform data defined\n");
+ return -EINVAL;
+ }
+
+ r = kzalloc(sizeof(struct pxa930_rotary), GFP_KERNEL);
+ if (!r)
+ return -ENOMEM;
+
+ r->mmio_base = ioremap_nocache(res->start, resource_size(res));
+ if (r->mmio_base == NULL) {
+ dev_err(&pdev->dev, "failed to remap IO memory\n");
+ err = -ENXIO;
+ goto failed_free;
+ }
+
+ r->pdata = pdata;
+ platform_set_drvdata(pdev, r);
+
+ /* allocate and register the input device */
+ input_dev = input_allocate_device();
+ if (!input_dev) {
+ dev_err(&pdev->dev, "failed to allocate input device\n");
+ err = -ENOMEM;
+ goto failed_free_io;
+ }
+
+ input_dev->name = pdev->name;
+ input_dev->id.bustype = BUS_HOST;
+ input_dev->open = pxa930_rotary_open;
+ input_dev->close = pxa930_rotary_close;
+ input_dev->dev.parent = &pdev->dev;
+
+ if (pdata->up_key && pdata->down_key) {
+ __set_bit(pdata->up_key, input_dev->keybit);
+ __set_bit(pdata->down_key, input_dev->keybit);
+ __set_bit(EV_KEY, input_dev->evbit);
+ } else {
+ __set_bit(pdata->rel_code, input_dev->relbit);
+ __set_bit(EV_REL, input_dev->evbit);
+ }
+
+ r->input_dev = input_dev;
+ input_set_drvdata(input_dev, r);
+
+ err = request_irq(irq, rotary_irq, 0,
+ "enhanced rotary", r);
+ if (err) {
+ dev_err(&pdev->dev, "failed to request IRQ\n");
+ goto failed_free_input;
+ }
+
+ err = input_register_device(input_dev);
+ if (err) {
+ dev_err(&pdev->dev, "failed to register input device\n");
+ goto failed_free_irq;
+ }
+
+ return 0;
+
+failed_free_irq:
+ free_irq(irq, r);
+failed_free_input:
+ input_free_device(input_dev);
+failed_free_io:
+ iounmap(r->mmio_base);
+failed_free:
+ kfree(r);
+ return err;
+}
+
+static int pxa930_rotary_remove(struct platform_device *pdev)
+{
+ struct pxa930_rotary *r = platform_get_drvdata(pdev);
+
+ free_irq(platform_get_irq(pdev, 0), r);
+ input_unregister_device(r->input_dev);
+ iounmap(r->mmio_base);
+ kfree(r);
+
+ return 0;
+}
+
+static struct platform_driver pxa930_rotary_driver = {
+ .driver = {
+ .name = "pxa930-rotary",
+ },
+ .probe = pxa930_rotary_probe,
+ .remove = pxa930_rotary_remove,
+};
+module_platform_driver(pxa930_rotary_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Driver for PXA93x Enhanced Rotary Controller");
+MODULE_AUTHOR("Yao Yong <yaoyong@marvell.com>");
Code Review / kvmfornfv.git / blobdiff