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Wed, 22 Aug 2007 01:11:01 -0700 (PDT) Received-SPF: neutral (google.com: 157.159.10.44 is neither permitted nor denied by best guess record for domain of florian.fainelli@telecomint.eu) client-ip=157.159.10.44; Received: from smtp-ext.int-evry.fr (smtp-ext.int-evry.fr [157.159.11.17]) by smtp1.int-evry.fr (Postfix) with ESMTP id 122398E84F0; Wed, 22 Aug 2007 10:10:48 +0200 (CEST) Received: from ibook.lan (mla78-1-82-240-16-241.fbx.proxad.net [82.240.16.241]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp-ext.int-evry.fr (Postfix) with ESMTP id 73CFED0E336; Wed, 22 Aug 2007 10:10:47 +0200 (CEST) From: Matteo Croce To: linux-mips@linux-mips.org Subject: [PATCH][MIPS][3/7] AR7: gpio char device Date: Sat, 8 Sep 2007 02:20:17 +0200 User-Agent: KMail/1.9.7 References: <200709080143.12345.technoboy85@gmail.com> In-Reply-To: <200709080143.12345.technoboy85@gmail.com> MIME-Version: 1.0 Message-Id: <200709080220.17882.technoboy85@gmail.com> X-int-MailScanner-Information: Please contact the ISP for more information X-int-MailScanner: Found to be clean X-int-MailScanner-SpamCheck: n'est pas un polluriel (inscrit sur la liste blanche), SpamAssassin (pas en cache, score=-1.467, requis 4.01, autolearn=not spam, AWL 1.00, BAYES_00 -2.60, FORGED_RCVD_HELO 0.14) X-int-MailScanner-From: florian.fainelli@telecomint.eu Content-Disposition: inline Cc: Nicolas Thill , openwrt-devel@lists.openwrt.org, Andrew Morton Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Return-Path: X-Envelope-To: <"|/home/ecartis/ecartis -s linux-mips"> (uid 0) X-Orcpt: rfc822;linux-mips@linux-mips.org Original-Recipient: rfc822;linux-mips@linux-mips.org X-archive-position: 16421 X-ecartis-version: Ecartis v1.0.0 Sender: linux-mips-bounce@linux-mips.org Errors-to: linux-mips-bounce@linux-mips.org X-original-sender: technoboy85@gmail.com Precedence: bulk X-list: linux-mips Char device to access GPIO pins Signed-off-by: Matteo Croce Signed-off-by: Nicolas Thill diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig index b391776..d56cfd7 100644 --- a/drivers/char/Kconfig +++ b/drivers/char/Kconfig @@ -928,6 +928,15 @@ config MWAVE To compile this driver as a module, choose M here: the module will be called mwave. +config AR7_GPIO + tristate "TI AR7 GPIO Support" + depends on AR7 + help + Give userspace access to the GPIO pins on the Texas Instruments AR7 + processors. + + If compiled as a module, it will be called ar7_gpio. + config SCx200_GPIO tristate "NatSemi SCx200 GPIO Support" depends on SCx200 diff --git a/drivers/char/Makefile b/drivers/char/Makefile index d68ddbe..804319e 100644 --- a/drivers/char/Makefile +++ b/drivers/char/Makefile @@ -89,6 +89,7 @@ obj-$(CONFIG_COBALT_LCD) += lcd.o obj-$(CONFIG_PPDEV) += ppdev.o obj-$(CONFIG_NWBUTTON) += nwbutton.o obj-$(CONFIG_NWFLASH) += nwflash.o +obj-$(CONFIG_AR7_GPIO) += ar7_gpio.o obj-$(CONFIG_SCx200_GPIO) += scx200_gpio.o obj-$(CONFIG_PC8736x_GPIO) += pc8736x_gpio.o obj-$(CONFIG_NSC_GPIO) += nsc_gpio.o diff --git a/drivers/char/ar7_gpio.c b/drivers/char/ar7_gpio.c new file mode 100644 index 0000000..d57a23e --- /dev/null +++ b/drivers/char/ar7_gpio.c @@ -0,0 +1,158 @@ +/* + * Copyright (C) 2007 Nicolas Thill + * + * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define DRVNAME "ar7_gpio" +#define LONGNAME "TI AR7 GPIOs Driver" + +MODULE_AUTHOR("Nicolas Thill "); +MODULE_DESCRIPTION(LONGNAME); +MODULE_LICENSE("GPL"); + +static int ar7_gpio_major; + +static ssize_t ar7_gpio_write(struct file *file, const char __user *buf, + size_t len, loff_t *ppos) +{ + int pin = iminor(file->f_dentry->d_inode); + size_t i; + + for (i = 0; i < len; ++i) { + char c; + if (get_user(c, buf + i)) + return -EFAULT; + switch (c) { + case '0': + gpio_set_value(pin, 0); + break; + case '1': + gpio_set_value(pin, 1); + break; + case 'd': + case 'D': + ar7_gpio_disable(pin); + break; + case 'e': + case 'E': + ar7_gpio_enable(pin); + break; + case 'i': + case 'I': + case '<': + gpio_direction_input(pin); + break; + case 'o': + case 'O': + case '>': + gpio_direction_output(pin); + break; + default: + return -EINVAL; + } + } + + return len; +} + +static ssize_t ar7_gpio_read(struct file *file, char __user *buf, + size_t len, loff_t *ppos) +{ + int pin = iminor(file->f_dentry->d_inode); + int value; + + value = gpio_get_value(pin); + if (put_user(value ? '1' : '0', buf)) + return -EFAULT; + + return 1; +} + +static int ar7_gpio_open(struct inode *inode, struct file *file) +{ + int m = iminor(inode); + + if (m >= AR7_GPIO_MAX) + return -EINVAL; + + return nonseekable_open(inode, file); +} + +static int ar7_gpio_release(struct inode *inode, struct file *file) +{ + return 0; +} + +static const struct file_operations ar7_gpio_fops = { + .owner = THIS_MODULE, + .write = ar7_gpio_write, + .read = ar7_gpio_read, + .open = ar7_gpio_open, + .release = ar7_gpio_release, + .llseek = no_llseek, +}; + +static struct platform_device *ar7_gpio_device; + +static int __init ar7_gpio_init(void) +{ + int rc; + + ar7_gpio_device = platform_device_alloc(DRVNAME, -1); + if (!ar7_gpio_device) + return -ENOMEM; + + rc = platform_device_add(ar7_gpio_device); + if (rc < 0) + goto out_put; + + rc = register_chrdev(ar7_gpio_major, DRVNAME, &ar7_gpio_fops); + if (rc < 0) + goto out_put; + + ar7_gpio_major = rc; + + rc = 0; + + goto out; + +out_put: + platform_device_put(ar7_gpio_device); +out: + return rc; +} + +static void __exit ar7_gpio_exit(void) +{ + unregister_chrdev(ar7_gpio_major, DRVNAME); + platform_device_unregister(ar7_gpio_device); +} + +module_init(ar7_gpio_init); +module_exit(ar7_gpio_exit);