diff --git a/meta-digi-arm/conf/machine/ccxmx53js.conf b/meta-digi-arm/conf/machine/ccxmx53js.conf index e97255ea5..30d83cf65 100644 --- a/meta-digi-arm/conf/machine/ccxmx53js.conf +++ b/meta-digi-arm/conf/machine/ccxmx53js.conf @@ -16,3 +16,4 @@ UBOOT_ENTRYPOINT_mx53 = "0x70800000" UBOOT_LOADADDRESS_mx53 = "0x70800000" MACHINE_ESSENTIAL_EXTRA_RDEPENDS += "kernel-module-redpine" +MACHINE_ESSENTIAL_EXTRA_RDEPENDS += "kernel-module-gpio" diff --git a/meta-digi-arm/recipes-kernel/kernel-module-gpio/files/COPYING b/meta-digi-arm/recipes-kernel/kernel-module-gpio/files/COPYING new file mode 100644 index 000000000..6d45519c8 --- /dev/null +++ b/meta-digi-arm/recipes-kernel/kernel-module-gpio/files/COPYING @@ -0,0 +1,340 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc. + 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. 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If this is what you want to do, use the GNU Library General +Public License instead of this License. diff --git a/meta-digi-arm/recipes-kernel/kernel-module-gpio/files/Makefile b/meta-digi-arm/recipes-kernel/kernel-module-gpio/files/Makefile new file mode 100644 index 000000000..eefc3d188 --- /dev/null +++ b/meta-digi-arm/recipes-kernel/kernel-module-gpio/files/Makefile @@ -0,0 +1,14 @@ +obj-m := gpio.o + +SRC := $(shell pwd) + +all: + $(MAKE) -C $(KERNEL_SRC) M=$(SRC) + +modules_install: + $(MAKE) -C $(KERNEL_SRC) M=$(SRC) modules_install + +clean: + rm -f *.o *~ core .depend .*.cmd *.ko *.mod.c + rm -f Module.markers Module.symvers modules.order + rm -rf .tmp_versions Modules.symvers diff --git a/meta-digi-arm/recipes-kernel/kernel-module-gpio/files/gpio.c b/meta-digi-arm/recipes-kernel/kernel-module-gpio/files/gpio.c new file mode 100644 index 000000000..02be001e2 --- /dev/null +++ b/meta-digi-arm/recipes-kernel/kernel-module-gpio/files/gpio.c @@ -0,0 +1,350 @@ +/* + * gpio.c + * + * Copyright (C)2006-2008 by Digi International Inc. + * All rights reserved. + * + * 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 "gpio.h" + +#define DRIVER_VERSION "2.1" +#define DRIVER_NAME "gpio" + +static int gpio_major = 240; /* set to 0 for dynamic allocation */ +static int gpio_minor = 0; +static int gpio_nr_devs; +static struct gpio_dev *gpio_device = NULL; + +static int gpio_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, unsigned long arg ); +static unsigned int gpio_poll(struct file *file, poll_table *wait ); +static ssize_t gpio_write(struct file * file, const char * buf, + size_t count, loff_t * ppos ); +static ssize_t gpio_read(struct file * file, char * buf, + size_t count, loff_t * ppos ); +static int gpio_open(struct inode * inode, struct file * file ); +static int gpio_release_close(struct inode * inode, struct file * file ); + +static struct file_operations gpio_fops = { + .owner = THIS_MODULE, + .read = gpio_read, + .write = gpio_write, + .ioctl = gpio_ioctl, + .poll = gpio_poll, + .open = gpio_open, + .release = gpio_release_close, +}; + +struct gpio_conf { + int dev_id; /* minor */ + int irqnum; /* irq number assigned */ + + /* needed for irq-waiting */ + wait_queue_head_t wait_q; + int triggered; +}; + +struct gpio_dev { + struct cdev cdev; + struct gpio_conf *gpio; +}; + +static irqreturn_t gpio_irq_handler(int irq, void *dev_id) +{ + struct gpio_conf *gpio = dev_id; + + /* awake those processes waiting... */ + gpio->triggered = 1; + wake_up_interruptible(&gpio->wait_q); + + return IRQ_HANDLED; +} + +static int gpio_ioctl(struct inode *inode, + struct file *file, + unsigned int cmd, + unsigned long arg ) +{ + struct gpio_conf *gpio = (struct gpio_conf *)file->private_data; + unsigned long irqflags = 0; + int gpionum = MINOR(inode->i_rdev); + char __user *argp = (char __user *)arg; + int retval = 0, irqnum; + + if(_IOC_TYPE(cmd)!= GPIO_IOCTL_BASE )return -ENOTTY; + if(_IOC_NR(cmd)> GPIO_IOCTL_MAXNR )return -ENOTTY; + + if (gpionum != gpio->dev_id) + return -EINVAL; + + switch(cmd ){ + case GPIO_CONFIG_AS_INP: /* config as input */ + if(gpio->irqnum >= 0 ){ + free_irq(gpio->irqnum, gpio ); + gpio->irqnum = -1; + } + retval = gpio_direction_input((unsigned int)gpionum); + break; + + case GPIO_CONFIG_AS_OUT: /* config as output */ + if(gpio->irqnum >= 0 ){ + free_irq(gpio->irqnum, gpio ); + gpio->irqnum = -1; + } + retval = gpio_direction_output((unsigned int)gpionum, + gpio_get_value((unsigned int)gpionum)); + break; + + case GPIO_READ_PIN_VAL: /* read value of the selected pin */ + retval = gpio_get_value((unsigned int)gpionum); + gpio->triggered = 0; + if (copy_to_user(argp, &retval, sizeof(int))) + return -EINVAL; + break; + + case GPIO_WRITE_PIN_VAL: /* write value to the selected pin */ + gpio_set_value((unsigned int)gpionum, *argp); + break; + + case GPIO_CONFIG_AS_IRQ: /* Configure this pin as external interrupt line */ + if(gpio->irqnum >= 0 ) + break; + retval = gpio_direction_input((unsigned int)gpionum); + irqnum = gpio_to_irq(gpionum); + if (irqnum >= 0){ + gpio->irqnum = irqnum; + + init_waitqueue_head(&gpio->wait_q ); + gpio->triggered = 0; + + switch( (ext_irq_type_t)*argp ) { + case IRQ_HIGH: + irqflags = IRQ_TYPE_LEVEL_HIGH; + break; + case IRQ_LOW: + irqflags = IRQ_TYPE_LEVEL_LOW; + break; + case IRQ_RISING: + irqflags = IRQ_TYPE_EDGE_RISING; + break; + case IRQ_FALLING: + irqflags = IRQ_TYPE_EDGE_FALLING; + break; + default: + return -EINVAL; + } + + if((retval = request_irq(gpio->irqnum, gpio_irq_handler, + irqflags, DRIVER_NAME, gpio ))!= 0 ){ + printk(KERN_ERR "Unable to request irq %d, ret %d\n", gpio->irqnum, retval ); + gpio->irqnum = -1; + return retval; + } + } + break; +#if defined(CONFIG_MACH_CC9M2443JS) || defined(CONFIG_MACH_CCW9M2443JS) + case GPIO_CONFIG_PULLUPDOWN: /* Configure this pin pull up/down */ + gpio_set_pullupdown((unsigned int)gpionum, (int)arg); + break; +#endif + default: return -ENOTTY; + } /* switch(cmd )*/ + + return retval; +} + +static unsigned int gpio_poll(struct file *file, poll_table *wait ) +{ + unsigned int ret = 0; + struct gpio_conf *gpio = (struct gpio_conf *)file->private_data; + + poll_wait(file, &gpio->wait_q, wait); + + if (file->f_mode & FMODE_WRITE) + ret |= POLLOUT | POLLWRNORM; + if (gpio->triggered) + ret |= POLLOUT | POLLRDNORM; + + return ret; +} + +static ssize_t gpio_write(struct file * file, const char * buf, size_t count, + loff_t * ppos) +{ + struct gpio_conf *gpio = (struct gpio_conf *)file->private_data; + int gpionum = MINOR(file->f_dentry->d_inode->i_rdev); + char outval; + + if ((gpionum != gpio->dev_id)|| (count != sizeof(char))) + return -EINVAL; + + if (copy_from_user(&outval, buf, sizeof(char))) + return -EFAULT; + + gpio_set_value(gpionum, (unsigned int)outval); + + return sizeof(char); +} + +static ssize_t gpio_read(struct file * file, char * buf, size_t count, + loff_t * ppos) +{ + struct gpio_conf *gpio = (struct gpio_conf *)file->private_data; + int gpionum = MINOR(file->f_dentry->d_inode->i_rdev); + int ret; + + if ((gpionum != gpio->dev_id)|| (count != sizeof(char))) + return -EINVAL; + + /* Check if configured for interrupt operation... */ + if (gpio->irqnum >= 0){ + /* Wait for data */ + if (!(file->f_flags & O_NONBLOCK)){ + wait_event_interruptible(gpio->wait_q, gpio->triggered != 0); + if (signal_pending(current)) + return -ERESTARTSYS; + } + gpio->triggered = 0; + } + + ret = gpio_get_value((unsigned int)gpionum); + + if (copy_to_user(buf, (char *)&ret, sizeof(char))) + return -EFAULT; + + return sizeof(char); +} + +static int gpio_open(struct inode * inode, struct file * file) +{ + int gpionum = MINOR(inode->i_rdev); + int ret; + struct gpio_dev *dev = + container_of(inode->i_cdev, struct gpio_dev, cdev); + + if (gpionum != dev->gpio[gpionum].dev_id) + return -EINVAL; + + ret = gpio_request(gpionum, DRIVER_NAME); + if (ret < 0) + return ret; + + file->private_data = &dev->gpio[gpionum]; + + return 0; +} + +static int gpio_release_close(struct inode * inode, struct file * file) +{ + struct gpio_conf *gpio = (struct gpio_conf *)file->private_data; + int gpionum = MINOR(inode->i_rdev); + + if (gpionum != gpio->dev_id) + return -EINVAL; + + if (gpio->irqnum >= 0){ + free_irq(gpio->irqnum, gpio); + gpio->irqnum = -1; + } + + gpio_free(gpionum); + + return 0; +} + +static void gpio_exit(void) +{ + int i; + dev_t devno = MKDEV(gpio_major, gpio_minor); + + if (gpio_device){ + for (i = 0; i < gpio_nr_devs; i++){ + if (gpio_device->gpio[i].irqnum != -1) + free_irq(gpio_device->gpio[i].irqnum, + &gpio_device->gpio[i]); + cdev_del(&gpio_device->cdev); + } + kfree(gpio_device); + } + unregister_chrdev_region(devno, gpio_nr_devs); +} + +static int gpio_init(void) +{ + int ret, i; + dev_t dev; + + gpio_nr_devs = 256; + + if (gpio_major){ + dev = MKDEV(gpio_major, gpio_minor); + ret = register_chrdev_region(dev, gpio_nr_devs, DRIVER_NAME); + } else { + ret = alloc_chrdev_region(&dev, gpio_minor, + gpio_nr_devs, DRIVER_NAME); + gpio_major = MAJOR(dev); + } + + if (ret < 0){ + pr_err(DRIVER_NAME ": major %d allready in use \n", gpio_major); + return ret; + } + + gpio_device = kzalloc(sizeof(*gpio_device), GFP_KERNEL); + if (!gpio_device){ + ret = -ENOMEM; + goto fail; + } + + gpio_device->gpio = + kzalloc(sizeof(*gpio_device->gpio)* gpio_nr_devs, GFP_KERNEL); + if (!gpio_device->gpio){ + ret = -ENOMEM; + goto fail; + } + + cdev_init(&gpio_device->cdev, &gpio_fops); + gpio_device->cdev.owner = THIS_MODULE; + gpio_device->cdev.ops = &gpio_fops; + if (cdev_add(&gpio_device->cdev, dev, gpio_nr_devs)){ + pr_err(DRIVER_NAME ": Error adding cdev\n"); + ret = -ENODEV; + goto fail; + } + + for (i = 0; i < gpio_nr_devs; i++){ + gpio_device->gpio[i].dev_id = i; + gpio_device->gpio[i].irqnum = -1; + } + + pr_info(DRIVER_NAME ": GPIO driver v%s\n", DRIVER_VERSION); + return 0; + +fail: + gpio_exit(); + return ret; +} + +MODULE_AUTHOR("Digi International Inc."); +MODULE_DESCRIPTION("GPIO driver for the user space"); +MODULE_LICENSE("GPL v2"); + +module_init(gpio_init); +module_exit(gpio_exit); diff --git a/meta-digi-arm/recipes-kernel/kernel-module-gpio/files/gpio.h b/meta-digi-arm/recipes-kernel/kernel-module-gpio/files/gpio.h new file mode 100644 index 000000000..ac0c77d64 --- /dev/null +++ b/meta-digi-arm/recipes-kernel/kernel-module-gpio/files/gpio.h @@ -0,0 +1,45 @@ +/* + * gpio.h + * + * Copyright (C) 2006 by Digi International Inc. + * All rights reserved. + * + * 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. + */ + +#ifndef __DIGI_GPIO_H_ +#define __DIGI_GPIO_H_ + +typedef enum { + IRQ_HIGH, + IRQ_LOW, + IRQ_RISING, + IRQ_FALLING +}ext_irq_type_t; + +#define PULLUP 0x00 +#define PULLDOWN 0x02 +#define PULLUPDOWN_DISABLED 0x03 + +/* ioctl magic numbers */ +#define GPIO_IOCTL_BASE 'G' + +/* inputs */ +#define GPIO_CONFIG_AS_INP _IO (GPIO_IOCTL_BASE, 0) /* config this pin as input */ +#define GPIO_READ_PIN_VAL _IOR (GPIO_IOCTL_BASE, 1, int) /* read pin value */ + +/* outputs */ +#define GPIO_CONFIG_AS_OUT _IO (GPIO_IOCTL_BASE, 2) /* config this pin as output */ +#define GPIO_WRITE_PIN_VAL _IOW (GPIO_IOCTL_BASE, 3, int) /* sets the pin value */ + +/* irqs */ +#define GPIO_CONFIG_AS_IRQ _IOR (GPIO_IOCTL_BASE, 4, ext_irq_type_t) /* config this pin as interrupt */ + +/* pull up/down */ +#define GPIO_CONFIG_PULLUPDOWN _IOW (GPIO_IOCTL_BASE, 5, int) /* config this pin pull up/down resistor */ + +#define GPIO_IOCTL_MAXNR 5 + +#endif /* __DIGI_GPIO_H_ */ diff --git a/meta-digi-arm/recipes-kernel/kernel-module-gpio/kernel-module-gpio.bb b/meta-digi-arm/recipes-kernel/kernel-module-gpio/kernel-module-gpio.bb new file mode 100644 index 000000000..2669f54af --- /dev/null +++ b/meta-digi-arm/recipes-kernel/kernel-module-gpio/kernel-module-gpio.bb @@ -0,0 +1,17 @@ +DESCRIPTION = "Example GPIO kernel module." +LICENSE = "GPLv2" +LIC_FILES_CHKSUM = "file://COPYING;md5=12f884d2ae1ff87c09e5b7ccc2c4ca7e" + +inherit module + +PR = "r0" +PV = "2.1" + +SRC_URI = "\ + file://Makefile \ + file://gpio.c \ + file://gpio.h \ + file://COPYING \ + " + +S = "${WORKDIR}"