From 78a56aab11234e53b7e94e5a255cc3d27ab0a62b Mon Sep 17 00:00:00 2001 From: Phil Blundell Date: Thu, 18 Jan 2007 00:44:09 -0500 Subject: Input: gpio-keys - keyboard driver for GPIO buttons This is an interrupt-driven keyboard driver for simple buttons connected directly to CPU GPIO lines of embedded ARM systems. It supports pxa architectures and is used by a number of PDAs and PocketPC phones in the handhelds.org kernel. Support for other architectures, such as sa11xx and sc2410, will be added once generic GPIO API is available. Signed-off-by: Paul Sokolovsky Signed-off-by: Philipp Zabel Signed-off-by: Dmitry Torokhov --- drivers/input/keyboard/gpio_keys.c | 147 +++++++++++++++++++++++++++++++++++++ 1 file changed, 147 insertions(+) create mode 100644 drivers/input/keyboard/gpio_keys.c (limited to 'drivers/input/keyboard/gpio_keys.c') diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c new file mode 100644 index 00000000000..3a8f1b427a7 --- /dev/null +++ b/drivers/input/keyboard/gpio_keys.c @@ -0,0 +1,147 @@ +/* + * Driver for keys on GPIO lines capable of generating interrupts. + * + * Copyright 2005 Phil Blundell + * + * 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 +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include + +static irqreturn_t gpio_keys_isr(int irq, void *dev_id) +{ + int i; + struct platform_device *pdev = dev_id; + struct gpio_keys_platform_data *pdata = pdev->dev.platform_data; + struct input_dev *input = platform_get_drvdata(pdev); + + for (i = 0; i < pdata->nbuttons; i++) { + int gpio = pdata->buttons[i].gpio; + if (irq == IRQ_GPIO(gpio)) { + int state = ((GPLR(gpio) & GPIO_bit(gpio)) ? 1 : 0) ^ (pdata->buttons[i].active_low); + + input_report_key(input, pdata->buttons[i].keycode, state); + input_sync(input); + } + } + + return IRQ_HANDLED; +} + +static int __devinit gpio_keys_probe(struct platform_device *pdev) +{ + struct gpio_keys_platform_data *pdata = pdev->dev.platform_data; + struct input_dev *input; + int i, error; + + input = input_allocate_device(); + if (!input) + return -ENOMEM; + + platform_set_drvdata(pdev, input); + + input->evbit[0] = BIT(EV_KEY); + + input->name = pdev->name; + input->phys = "gpio-keys/input0"; + input->cdev.dev = &pdev->dev; + input->private = pdata; + + input->id.bustype = BUS_HOST; + input->id.vendor = 0x0001; + input->id.product = 0x0001; + input->id.version = 0x0100; + + for (i = 0; i < pdata->nbuttons; i++) { + int code = pdata->buttons[i].keycode; + int irq = IRQ_GPIO(pdata->buttons[i].gpio); + + set_irq_type(irq, IRQ_TYPE_EDGE_BOTH); + error = request_irq(irq, gpio_keys_isr, SA_SAMPLE_RANDOM, + pdata->buttons[i].desc ? pdata->buttons[i].desc : "gpio_keys", + pdev); + if (error) { + printk(KERN_ERR "gpio-keys: unable to claim irq %d; error %d\n", irq, ret); + goto fail; + } + set_bit(code, input->keybit); + } + + error = input_register_device(input); + if (error) { + printk(KERN_ERR "Unable to register gpio-keys input device\n"); + goto fail; + } + + return 0; + + fail: + for (i = i - 1; i >= 0; i--) + free_irq(IRQ_GPIO(pdata->buttons[i].gpio), pdev); + + input_free_device(input); + + return error; +} + +static int __devexit gpio_keys_remove(struct platform_device *pdev) +{ + struct gpio_keys_platform_data *pdata = pdev->dev.platform_data; + struct input_dev *input = platform_get_drvdata(pdev); + int i; + + for (i = 0; i < pdata->nbuttons; i++) { + int irq = IRQ_GPIO(pdata->buttons[i].gpio); + free_irq(irq, pdev); + } + + input_unregister_device(input); + + return 0; +} + +struct platform_driver gpio_keys_device_driver = { + .probe = gpio_keys_probe, + .remove = __devexit_p(gpio_keys_remove), + .driver = { + .name = "gpio-keys", + } +}; + +static int __init gpio_keys_init(void) +{ + return platform_driver_register(&gpio_keys_device_driver); +} + +static void __exit gpio_keys_exit(void) +{ + platform_driver_unregister(&gpio_keys_device_driver); +} + +module_init(gpio_keys_init); +module_exit(gpio_keys_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Phil Blundell "); +MODULE_DESCRIPTION("Keyboard driver for CPU GPIOs"); -- cgit v1.2.3