Input: add support for enhanced rotary controller on pxa930 and pxa935

Signed-off-by: Yong Yao <yaoyong@marvell.com>
Signed-off-by: Eric Miao <eric.miao@marvell.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 212 insertions, 0 deletions

diff --git a/drivers/input/keyboard/pxa930_rotary.c b/drivers/input/keyboard/pxa930_rotary.c
new file mode 100644
index 000000000000..95fbba470e65
--- /dev/null
+++ b/drivers/input/keyboard/pxa930_rotary.c
@@ -0,0 +1,212 @@
+/*
+ * 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/init.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+
+#include <mach/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 __devinit pxa930_rotary_probe(struct platform_device *pdev)
+{
+        struct pxa930_rotary_platform_data *pdata = pdev->dev.platform_data;
+        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, IRQF_DISABLED,
+                        "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 __devexit 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);
+        platform_set_drvdata(pdev, NULL);
+        kfree(r);
+
+        return 0;
+}
+
+static struct platform_driver pxa930_rotary_driver = {
+        .driver         = {
+                .name   = "pxa930-rotary",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = pxa930_rotary_probe,
+        .remove         = __devexit_p(pxa930_rotary_remove),
+};
+
+static int __init pxa930_rotary_init(void)
+{
+        return platform_driver_register(&pxa930_rotary_driver);
+}
+module_init(pxa930_rotary_init);
+
+static void __exit pxa930_rotary_exit(void)
+{
+        platform_driver_unregister(&pxa930_rotary_driver);
+}
+module_exit(pxa930_rotary_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Driver for PXA93x Enhanced Rotary Controller");
+MODULE_AUTHOR("Yao Yong <yaoyong@marvell.com>");