diff options
Diffstat (limited to 'drivers/input/keyboard/opencores-kbd.c')
| -rw-r--r-- | drivers/input/keyboard/opencores-kbd.c | 180 |
1 files changed, 180 insertions, 0 deletions
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"); |