Input: add driver for OpenCores Keyboard Controller

Driver for the keyboard hardware documented here:
	http://www.opencores.org/project,keyboardcontroller

Signed-off-by: Javier Herrero <jherrero@hvsistemas.es>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

3 files changed, 190 insertions, 0 deletions

diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index 3525c19be428..b14bd3a07140 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -260,6 +260,15 @@ config KEYBOARD_NEWTON
           To compile this driver as a module, choose M here: the
           module will be called newtonkbd.
 
+config KEYBOARD_OPENCORES
+        tristate "OpenCores Keyboard Controller"
+        help
+          Say Y here if you want to use the OpenCores Keyboard Controller
+          http://www.opencores.org/project,keyboardcontroller
+
+          To compile this driver as a module, choose M here; the
+          module will be called opencores-kbd.
+
 config KEYBOARD_PXA27x
         tristate "PXA27x/PXA3xx keypad support"
         depends on PXA27x || PXA3xx
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index 8a7a22b30266..ab35ac36111e 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -23,6 +23,7 @@ obj-$(CONFIG_KEYBOARD_MAPLE)		+= maple_keyb.o
 obj-$(CONFIG_KEYBOARD_MATRIX)           += matrix_keypad.o
 obj-$(CONFIG_KEYBOARD_NEWTON)           += newtonkbd.o
 obj-$(CONFIG_KEYBOARD_OMAP)             += omap-keypad.o
+obj-$(CONFIG_KEYBOARD_OPENCORES)        += opencores-kbd.o
 obj-$(CONFIG_KEYBOARD_PXA27x)           += pxa27x_keypad.o
 obj-$(CONFIG_KEYBOARD_PXA930_ROTARY)    += pxa930_rotary.o
 obj-$(CONFIG_KEYBOARD_SH_KEYSC)         += sh_keysc.o
diff --git a/drivers/input/keyboard/opencores-kbd.c b/drivers/input/keyboard/opencores-kbd.c
new file mode 100644
index 000000000000..78cccddbf551
--- /dev/null
+++ b/drivers/input/keyboard/opencores-kbd.c
@@ -0,0 +1,180 @@
+/*
+ * OpenCores Keyboard Controller Driver
+ * http://www.opencores.org/project,keyboardcontroller
+ *
+ * Copyright 2007-2009 HV Sistemas S.L.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+struct opencores_kbd {
+        struct input_dev *input;
+        struct resource *addr_res;
+        void __iomem *addr;
+        int irq;
+        unsigned short keycodes[128];
+};
+
+static irqreturn_t opencores_kbd_isr(int irq, void *dev_id)
+{
+        struct opencores_kbd *opencores_kbd = dev_id;
+        struct input_dev *input = opencores_kbd->input;
+        unsigned char c;
+
+        c = readb(opencores_kbd->addr);
+        input_report_key(input, c & 0x7f, c & 0x80 ? 0 : 1);
+        input_sync(input);
+
+        return IRQ_HANDLED;
+}
+
+static int __devinit opencores_kbd_probe(struct platform_device *pdev)
+{
+        struct input_dev *input;
+        struct opencores_kbd *opencores_kbd;
+        struct resource *res;
+        int irq, i, error;
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res) {
+                dev_err(&pdev->dev, "missing board memory resource\n");
+                return -EINVAL;
+        }
+
+        irq = platform_get_irq(pdev, 0);
+        if (irq < 0) {
+                dev_err(&pdev->dev, "missing board IRQ resource\n");
+                return -EINVAL;
+        }
+
+        opencores_kbd = kzalloc(sizeof(*opencores_kbd), GFP_KERNEL);
+        input = input_allocate_device();
+        if (!opencores_kbd || !input) {
+                dev_err(&pdev->dev, "failed to allocate device structures\n");
+                error = -ENOMEM;
+                goto err_free_mem;
+        }
+
+        opencores_kbd->addr_res = res;
+        res = request_mem_region(res->start, resource_size(res), pdev->name);
+        if (!res) {
+                dev_err(&pdev->dev, "failed to request I/O memory\n");
+                error = -EBUSY;
+                goto err_free_mem;
+        }
+
+        opencores_kbd->addr = ioremap(res->start, resource_size(res));
+        if (!opencores_kbd->addr) {
+                dev_err(&pdev->dev, "failed to remap I/O memory\n");
+                error = -ENXIO;
+                goto err_rel_mem;
+        }
+
+        opencores_kbd->input = input;
+        opencores_kbd->irq = irq;
+
+        input->name = pdev->name;
+        input->phys = "opencores-kbd/input0";
+        input->dev.parent = &pdev->dev;
+
+        input_set_drvdata(input, opencores_kbd);
+
+        input->id.bustype = BUS_HOST;
+        input->id.vendor = 0x0001;
+        input->id.product = 0x0001;
+        input->id.version = 0x0100;
+
+        input->keycode = opencores_kbd->keycodes;
+        input->keycodesize = sizeof(opencores_kbd->keycodes[0]);
+        input->keycodemax = ARRAY_SIZE(opencores_kbd->keycodes);
+
+        __set_bit(EV_KEY, input->evbit);
+
+        for (i = 0; i < ARRAY_SIZE(opencores_kbd->keycodes); i++) {
+                /*
+                 * OpenCores controller happens to have scancodes match
+                 * our KEY_* definitions.
+                 */
+                opencores_kbd->keycodes[i] = i;
+                __set_bit(opencores_kbd->keycodes[i], input->keybit);
+        }
+        __clear_bit(KEY_RESERVED, input->keybit);
+
+        error = request_irq(irq, &opencores_kbd_isr,
+                            IRQF_TRIGGER_RISING, pdev->name, opencores_kbd);
+        if (error) {
+                dev_err(&pdev->dev, "unable to claim irq %d\n", irq);
+                goto err_unmap_mem;
+        }
+
+        error = input_register_device(input);
+        if (error) {
+                dev_err(&pdev->dev, "unable to register input device\n");
+                goto err_free_irq;
+        }
+
+        platform_set_drvdata(pdev, opencores_kbd);
+
+        return 0;
+
+ err_free_irq:
+        free_irq(irq, opencores_kbd);
+ err_unmap_mem:
+        iounmap(opencores_kbd->addr);
+ err_rel_mem:
+        release_mem_region(res->start, resource_size(res));
+ err_free_mem:
+        input_free_device(input);
+        kfree(opencores_kbd);
+
+        return error;
+}
+
+static int __devexit opencores_kbd_remove(struct platform_device *pdev)
+{
+        struct opencores_kbd *opencores_kbd = platform_get_drvdata(pdev);
+
+        free_irq(opencores_kbd->irq, opencores_kbd);
+
+        iounmap(opencores_kbd->addr);
+        release_mem_region(opencores_kbd->addr_res->start,
+                resource_size(opencores_kbd->addr_res));
+        input_unregister_device(opencores_kbd->input);
+        kfree(opencores_kbd);
+
+        platform_set_drvdata(pdev, NULL);
+
+        return 0;
+}
+
+static struct platform_driver opencores_kbd_device_driver = {
+        .probe    = opencores_kbd_probe,
+        .remove   = __devexit_p(opencores_kbd_remove),
+        .driver   = {
+                .name = "opencores-kbd",
+        },
+};
+
+static int __init opencores_kbd_init(void)
+{
+        return platform_driver_register(&opencores_kbd_device_driver);
+}
+module_init(opencores_kbd_init);
+
+static void __exit opencores_kbd_exit(void)
+{
+        platform_driver_unregister(&opencores_kbd_device_driver);
+}
+module_exit(opencores_kbd_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Javier Herrero <jherrero@hvsistemas.es>");
+MODULE_DESCRIPTION("Keyboard driver for OpenCores Keyboard Controller");