From 677508fba07647c0b29f41434785383ebd6ea7f3 Mon Sep 17 00:00:00 2001 From: juhosg Date: Tue, 5 Aug 2008 09:52:23 +0000 Subject: [kernel] modules/gpio_dev: move to drivers/char/ on older kernels as well, and create a package for it git-svn-id: svn://svn.openwrt.org/openwrt/trunk@12133 3c298f89-4303-0410-b956-a3cf2f4a3e73 --- .../generic-2.6/files/drivers/char/gpio_dev.c | 201 +++++++++++++++++++++ .../linux/generic-2.6/files/drivers/gpio/Kconfig | 15 -- .../linux/generic-2.6/files/drivers/gpio/Makefile | 1 - .../generic-2.6/files/drivers/gpio/gpio_dev.c | 201 --------------------- 4 files changed, 201 insertions(+), 217 deletions(-) create mode 100644 target/linux/generic-2.6/files/drivers/char/gpio_dev.c delete mode 100644 target/linux/generic-2.6/files/drivers/gpio/Kconfig delete mode 100644 target/linux/generic-2.6/files/drivers/gpio/Makefile delete mode 100644 target/linux/generic-2.6/files/drivers/gpio/gpio_dev.c (limited to 'target/linux/generic-2.6/files/drivers') diff --git a/target/linux/generic-2.6/files/drivers/char/gpio_dev.c b/target/linux/generic-2.6/files/drivers/char/gpio_dev.c new file mode 100644 index 000000000..48ef76f8a --- /dev/null +++ b/target/linux/generic-2.6/files/drivers/char/gpio_dev.c @@ -0,0 +1,201 @@ +/* + * character device wrapper for generic gpio layer + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA02111-1307USA + * + * Feedback, Bugs... blogic@openwrt.org + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define DRVNAME "gpiodev" +#define DEVNAME "gpio" + +static int dev_major; +static unsigned int gpio_access_mask; +static struct class *gpio_class; + +/* Counter is 1, if the device is not opened and zero (or less) if opened. */ +static atomic_t gpio_open_cnt = ATOMIC_INIT(1); + +static int +gpio_ioctl(struct inode * inode, struct file * file, unsigned int cmd, unsigned long arg) +{ + int retval = 0; + + if (((1 << arg) & gpio_access_mask) != (1 << arg)) + { + retval = -EINVAL; + goto out; + } + + switch (cmd) + { + case GPIO_GET: + retval = gpio_get_value(arg); + break; + + case GPIO_SET: + gpio_set_value(arg, 1); + break; + + case GPIO_CLEAR: + gpio_set_value(arg, 0); + break; + + case GPIO_DIR_IN: + gpio_direction_input(arg); + break; + + case GPIO_DIR_OUT: + gpio_direction_output(arg, 0); + break; + + default: + retval = -EINVAL; + break; + } + +out: + return retval; +} + +static int +gpio_open(struct inode *inode, struct file *file) +{ + int result = 0; + unsigned int dev_minor = MINOR(inode->i_rdev); + + if (dev_minor != 0) + { + printk(KERN_ERR DRVNAME ": trying to access unknown minor device -> %d\n", dev_minor); + result = -ENODEV; + goto out; + } + + /* FIXME: We should really allow multiple applications to open the device + * at the same time, as long as the apps access different IO pins. + * The generic gpio-registration functions can be used for that. + * Two new IOCTLs have to be introduced for that. Need to check userspace + * compatibility first. --mb */ + if (!atomic_dec_and_test(&gpio_open_cnt)) { + atomic_inc(&gpio_open_cnt); + printk(KERN_ERR DRVNAME ": Device with minor ID %d already in use\n", dev_minor); + result = -EBUSY; + goto out; + } + +out: + return result; +} + +static int +gpio_close(struct inode * inode, struct file * file) +{ + smp_mb__before_atomic_inc(); + atomic_inc(&gpio_open_cnt); + + return 0; +} + +struct file_operations gpio_fops = { + ioctl: gpio_ioctl, + open: gpio_open, + release: gpio_close +}; + +static int +gpio_probe(struct platform_device *dev) +{ + int result = 0; + + dev_major = register_chrdev(0, DEVNAME, &gpio_fops); + if (!dev_major) + { + printk(KERN_ERR DRVNAME ": Error whilst opening %s \n", DEVNAME); + result = -ENODEV; + goto out; + } + + gpio_class = class_create(THIS_MODULE, DEVNAME); + class_device_create(gpio_class, NULL, MKDEV(dev_major, 0), NULL, DEVNAME); + + printk(KERN_INFO DRVNAME ": gpio device registered with major %d\n", dev_major); + + if (dev->num_resources != 1) + { + printk(KERN_ERR DRVNAME ": device may only have 1 resource\n"); + result = -ENODEV; + goto out; + } + + gpio_access_mask = dev->resource[0].start; + + printk(KERN_INFO DRVNAME ": gpio platform device registered with access mask %08X\n", gpio_access_mask); +out: + return result; +} + +static int +gpio_remove(struct platform_device *dev) +{ + unregister_chrdev(dev_major, DEVNAME); + return 0; +} + +static struct +platform_driver gpio_driver = { + .probe = gpio_probe, + .remove = gpio_remove, + .driver = { + .name = "GPIODEV", + .owner = THIS_MODULE, + }, +}; + +static int __init +gpio_mod_init(void) +{ + int ret = platform_driver_register(&gpio_driver); + if (ret) + printk(KERN_INFO DRVNAME ": Error registering platfom driver!"); + + return ret; +} + +static void __exit +gpio_mod_exit(void) +{ + platform_driver_unregister(&gpio_driver); +} + +module_init (gpio_mod_init); +module_exit (gpio_mod_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("John Crispin / OpenWrt"); +MODULE_DESCRIPTION("Character device for for generic gpio api"); diff --git a/target/linux/generic-2.6/files/drivers/gpio/Kconfig b/target/linux/generic-2.6/files/drivers/gpio/Kconfig deleted file mode 100644 index d97fc1b4f..000000000 --- a/target/linux/generic-2.6/files/drivers/gpio/Kconfig +++ /dev/null @@ -1,15 +0,0 @@ -menuconfig NEW_GPIO - bool "GPIO Support" - depends on GENERIC_GPIO - help - Say Y to enable Linux GPIO device support. This allows control of - GPIO pins using a character device - -if NEW_GPIO - -config GPIO_DEVICE - tristate "GPIO device support" - help - This option enables the gpio character device - -endif # NEW_GPIO diff --git a/target/linux/generic-2.6/files/drivers/gpio/Makefile b/target/linux/generic-2.6/files/drivers/gpio/Makefile deleted file mode 100644 index 166c5c743..000000000 --- a/target/linux/generic-2.6/files/drivers/gpio/Makefile +++ /dev/null @@ -1 +0,0 @@ -obj-$(CONFIG_GPIO_DEVICE) += gpio_dev.o diff --git a/target/linux/generic-2.6/files/drivers/gpio/gpio_dev.c b/target/linux/generic-2.6/files/drivers/gpio/gpio_dev.c deleted file mode 100644 index 48ef76f8a..000000000 --- a/target/linux/generic-2.6/files/drivers/gpio/gpio_dev.c +++ /dev/null @@ -1,201 +0,0 @@ -/* - * character device wrapper for generic gpio layer - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA02111-1307USA - * - * Feedback, Bugs... blogic@openwrt.org - * - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#define DRVNAME "gpiodev" -#define DEVNAME "gpio" - -static int dev_major; -static unsigned int gpio_access_mask; -static struct class *gpio_class; - -/* Counter is 1, if the device is not opened and zero (or less) if opened. */ -static atomic_t gpio_open_cnt = ATOMIC_INIT(1); - -static int -gpio_ioctl(struct inode * inode, struct file * file, unsigned int cmd, unsigned long arg) -{ - int retval = 0; - - if (((1 << arg) & gpio_access_mask) != (1 << arg)) - { - retval = -EINVAL; - goto out; - } - - switch (cmd) - { - case GPIO_GET: - retval = gpio_get_value(arg); - break; - - case GPIO_SET: - gpio_set_value(arg, 1); - break; - - case GPIO_CLEAR: - gpio_set_value(arg, 0); - break; - - case GPIO_DIR_IN: - gpio_direction_input(arg); - break; - - case GPIO_DIR_OUT: - gpio_direction_output(arg, 0); - break; - - default: - retval = -EINVAL; - break; - } - -out: - return retval; -} - -static int -gpio_open(struct inode *inode, struct file *file) -{ - int result = 0; - unsigned int dev_minor = MINOR(inode->i_rdev); - - if (dev_minor != 0) - { - printk(KERN_ERR DRVNAME ": trying to access unknown minor device -> %d\n", dev_minor); - result = -ENODEV; - goto out; - } - - /* FIXME: We should really allow multiple applications to open the device - * at the same time, as long as the apps access different IO pins. - * The generic gpio-registration functions can be used for that. - * Two new IOCTLs have to be introduced for that. Need to check userspace - * compatibility first. --mb */ - if (!atomic_dec_and_test(&gpio_open_cnt)) { - atomic_inc(&gpio_open_cnt); - printk(KERN_ERR DRVNAME ": Device with minor ID %d already in use\n", dev_minor); - result = -EBUSY; - goto out; - } - -out: - return result; -} - -static int -gpio_close(struct inode * inode, struct file * file) -{ - smp_mb__before_atomic_inc(); - atomic_inc(&gpio_open_cnt); - - return 0; -} - -struct file_operations gpio_fops = { - ioctl: gpio_ioctl, - open: gpio_open, - release: gpio_close -}; - -static int -gpio_probe(struct platform_device *dev) -{ - int result = 0; - - dev_major = register_chrdev(0, DEVNAME, &gpio_fops); - if (!dev_major) - { - printk(KERN_ERR DRVNAME ": Error whilst opening %s \n", DEVNAME); - result = -ENODEV; - goto out; - } - - gpio_class = class_create(THIS_MODULE, DEVNAME); - class_device_create(gpio_class, NULL, MKDEV(dev_major, 0), NULL, DEVNAME); - - printk(KERN_INFO DRVNAME ": gpio device registered with major %d\n", dev_major); - - if (dev->num_resources != 1) - { - printk(KERN_ERR DRVNAME ": device may only have 1 resource\n"); - result = -ENODEV; - goto out; - } - - gpio_access_mask = dev->resource[0].start; - - printk(KERN_INFO DRVNAME ": gpio platform device registered with access mask %08X\n", gpio_access_mask); -out: - return result; -} - -static int -gpio_remove(struct platform_device *dev) -{ - unregister_chrdev(dev_major, DEVNAME); - return 0; -} - -static struct -platform_driver gpio_driver = { - .probe = gpio_probe, - .remove = gpio_remove, - .driver = { - .name = "GPIODEV", - .owner = THIS_MODULE, - }, -}; - -static int __init -gpio_mod_init(void) -{ - int ret = platform_driver_register(&gpio_driver); - if (ret) - printk(KERN_INFO DRVNAME ": Error registering platfom driver!"); - - return ret; -} - -static void __exit -gpio_mod_exit(void) -{ - platform_driver_unregister(&gpio_driver); -} - -module_init (gpio_mod_init); -module_exit (gpio_mod_exit); - -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("John Crispin / OpenWrt"); -MODULE_DESCRIPTION("Character device for for generic gpio api"); -- cgit v1.2.3