594 lines
15 KiB
C
594 lines
15 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
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*
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* Copyright (C) 2005 infineon
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* Copyright (C) 2007 John Crispin <blogic@openwrt.org>
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*
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/proc_fs.h>
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#include <linux/init.h>
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#include <linux/ioctl.h>
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#include <linux/timer.h>
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#include <linux/module.h>
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#include <linux/timer.h>
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#include <linux/interrupt.h>
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#include <linux/kobject.h>
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#include <linux/workqueue.h>
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#include <linux/skbuff.h>
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#include <linux/netlink.h>
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#include <linux/platform_device.h>
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#include <net/sock.h>
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#include <asm/uaccess.h>
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#include <asm/semaphore.h>
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#include <asm/uaccess.h>
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#include <asm/ifxmips/ifxmips.h>
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#include <asm/ifxmips/ifxmips_ioctl.h>
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#define MAX_PORTS 2
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#define PINS_PER_PORT 16
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#define DRVNAME "ifxmips_gpio"
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static unsigned int ifxmips_gpio_major = 0;
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#ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
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#define IFXMIPS_RST_PIN 15
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#define IFXMIPS_RST_PORT 1
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static struct timer_list rst_button_timer;
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extern struct sock *uevent_sock;
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extern u64 uevent_next_seqnum(void);
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static unsigned long seen;
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static int pressed = 0;
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struct event_t {
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struct work_struct wq;
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int set;
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unsigned long jiffies;
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};
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#endif
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/* TODO do we need this ? */
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static struct semaphore port_sem;
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/* TODO do we really need this ? return in a define is forbidden by coding style */
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#define IFXMIPS_GPIO_SANITY {if (port > MAX_PORTS || pin > PINS_PER_PORT) return -EINVAL; }
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int
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ifxmips_port_reserve_pin (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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printk("%s : call to obseleted function\n", __func__);
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_reserve_pin);
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int
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ifxmips_port_free_pin (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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printk("%s : call to obseleted function\n", __func__);
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_free_pin);
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int
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ifxmips_port_set_open_drain (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_OD + (port * 0xC)) | (1 << pin), IFXMIPS_GPIO_P0_OD + (port * 0xC));
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_set_open_drain);
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int
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ifxmips_port_clear_open_drain (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_OD + (port * 0xC)) & ~(1 << pin), IFXMIPS_GPIO_P0_OD + (port * 0xC));
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_clear_open_drain);
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int
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ifxmips_port_set_pudsel (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC)) | (1 << pin), IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC));
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_set_pudsel);
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int
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ifxmips_port_clear_pudsel (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC)) & ~(1 << pin), IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC));
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_clear_pudsel);
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int
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ifxmips_port_set_puden (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_PUDEN + (port * 0xC)) | (1 << pin), IFXMIPS_GPIO_P0_PUDEN + (port * 0xC));
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_set_puden);
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int
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ifxmips_port_clear_puden (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_PUDEN + (port * 0xC)) & ~(1 << pin), IFXMIPS_GPIO_P0_PUDEN + (port * 0xC));
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_clear_puden);
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int
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ifxmips_port_set_stoff (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_STOFF + (port * 0xC)) | (1 << pin), IFXMIPS_GPIO_P0_STOFF + (port * 0xC));
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_set_stoff);
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int
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ifxmips_port_clear_stoff (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_STOFF + (port * 0xC)) & ~(1 << pin), IFXMIPS_GPIO_P0_STOFF + (port * 0xC));
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_clear_stoff);
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int
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ifxmips_port_set_dir_out (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_DIR + (port * 0xC)) | (1 << pin), IFXMIPS_GPIO_P0_DIR + (port * 0xC));
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_set_dir_out);
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int
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ifxmips_port_set_dir_in (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_DIR + (port * 0xC)) & ~(1 << pin), IFXMIPS_GPIO_P0_DIR + (port * 0xC));
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_set_dir_in);
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int
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ifxmips_port_set_output (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_OUT + (port * 0xC)) | (1 << pin), IFXMIPS_GPIO_P0_OUT + (port * 0xC));
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_set_output);
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int
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ifxmips_port_clear_output (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_OUT + (port * 0xC)) & ~(1 << pin), IFXMIPS_GPIO_P0_OUT + (port * 0xC));
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_clear_output);
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int
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ifxmips_port_get_input (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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if (readl(IFXMIPS_GPIO_P0_IN + (port * 0xC)) & (1 << pin))
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return 0;
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else
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return 1;
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}
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EXPORT_SYMBOL(ifxmips_port_get_input);
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int
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ifxmips_port_set_altsel0 (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC)) | (1 << pin), IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC));
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_set_altsel0);
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int
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ifxmips_port_clear_altsel0 (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC)) & ~(1 << pin), IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC));
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_clear_altsel0);
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int
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ifxmips_port_set_altsel1 (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC)) | (1 << pin), IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC));
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_set_altsel1);
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int
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ifxmips_port_clear_altsel1 (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC)) & ~(1 << pin), IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC));
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_clear_altsel1);
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#ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
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static inline void add_msg(struct sk_buff *skb, char *msg)
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{
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char *scratch;
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scratch = skb_put(skb, strlen(msg) + 1);
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sprintf(scratch, msg);
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}
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static void hotplug_button(struct work_struct *wq)
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{
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struct sk_buff *skb;
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struct event_t *event;
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size_t len;
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char *scratch, *s;
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char buf[128];
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event = container_of(wq, struct event_t, wq);
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if (!uevent_sock)
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goto done;
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/* allocate message with the maximum possible size */
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s = event->set ? "pressed" : "released";
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len = strlen(s) + 2;
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skb = alloc_skb(len + 2048, GFP_KERNEL);
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if (!skb)
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goto done;
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/* add header */
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scratch = skb_put(skb, len);
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sprintf(scratch, "%s@",s);
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/* copy keys to our continuous event payload buffer */
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add_msg(skb, "HOME=/");
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add_msg(skb, "PATH=/sbin:/bin:/usr/sbin:/usr/bin");
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add_msg(skb, "SUBSYSTEM=button");
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add_msg(skb, "BUTTON=reset");
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add_msg(skb, (event->set ? "ACTION=pressed" : "ACTION=released"));
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sprintf(buf, "SEEN=%ld", (event->jiffies - seen)/HZ);
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add_msg(skb, buf);
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snprintf(buf, 128, "SEQNUM=%llu", uevent_next_seqnum());
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add_msg(skb, buf);
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NETLINK_CB(skb).dst_group = 1;
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netlink_broadcast(uevent_sock, skb, 0, 1, GFP_KERNEL);
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done:
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kfree(event);
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}
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static void reset_button_poll(unsigned long unused)
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{
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struct event_t *event;
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rst_button_timer.expires = jiffies + HZ;
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add_timer(&rst_button_timer);
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if (pressed != ifxmips_port_get_input(IFXMIPS_RST_PORT, IFXMIPS_RST_PIN))
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{
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if(pressed)
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pressed = 0;
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else
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pressed = 1;
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printk("button was %s\n", (pressed ? "pressed" : "released"));
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event = (struct event_t *) kzalloc(sizeof(struct event_t), GFP_ATOMIC);
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if (!event)
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{
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printk("Could not alloc hotplug event\n");
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return;
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}
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event->set = pressed;
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event->jiffies = jiffies;
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INIT_WORK(&event->wq, (void *)(void *)hotplug_button);
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schedule_work(&event->wq);
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seen = jiffies;
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}
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}
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#endif
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long ifxmips_port_read_procmem_helper(char* tag, u32* in_reg, char *buf)
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{
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u32 reg, bit = 0;
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unsigned int len, t;
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len = sprintf(buf, "\n%s: ", tag);
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reg = readl(in_reg);
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bit = 0x80000000;
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for (t = 0; t < 32; t++) {
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if ((reg & bit) > 0)
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len = len + sprintf(buf + len, "X");
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else
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len = len + sprintf(buf + len, " ");
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bit = bit >> 1;
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}
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return len;
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}
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int
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ifxmips_port_read_procmem (char *buf, char **start, off_t offset, int count,
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int *eof, void *data)
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{
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long len = sprintf (buf, "\nIFXMips Port Settings\n");
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len += sprintf (buf + len,
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" 3 2 1 0\n");
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len += sprintf (buf + len,
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" 10987654321098765432109876543210\n");
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len += sprintf (buf + len,
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"----------------------------------------\n");
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len += ifxmips_port_read_procmem_helper("P0-OUT", IFXMIPS_GPIO_P0_OUT, &buf[len]);
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len += ifxmips_port_read_procmem_helper("P1-OUT", IFXMIPS_GPIO_P1_OUT, &buf[len]);
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len += ifxmips_port_read_procmem_helper("P0-IN ", IFXMIPS_GPIO_P0_IN, &buf[len]);
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len += ifxmips_port_read_procmem_helper("P1-IN ", IFXMIPS_GPIO_P1_IN, &buf[len]);
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len += ifxmips_port_read_procmem_helper("P0-DIR", IFXMIPS_GPIO_P0_DIR, &buf[len]);
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len += ifxmips_port_read_procmem_helper("P1-DIR", IFXMIPS_GPIO_P1_DIR, &buf[len]);
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len += ifxmips_port_read_procmem_helper("P0-STO ", IFXMIPS_GPIO_P0_STOFF, &buf[len]);
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len += ifxmips_port_read_procmem_helper("P1-STO ", IFXMIPS_GPIO_P1_STOFF, &buf[len]);
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len += ifxmips_port_read_procmem_helper("P0-PUDE", IFXMIPS_GPIO_P0_PUDEN, &buf[len]);
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len += ifxmips_port_read_procmem_helper("P1-PUDE", IFXMIPS_GPIO_P1_PUDEN, &buf[len]);
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len += ifxmips_port_read_procmem_helper("P0-OD ", IFXMIPS_GPIO_P0_OD, &buf[len]);
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len += ifxmips_port_read_procmem_helper("P1-OD ", IFXMIPS_GPIO_P1_OD, &buf[len]);
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len += ifxmips_port_read_procmem_helper("P0-PUDS", IFXMIPS_GPIO_P0_PUDSEL, &buf[len]);
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len += ifxmips_port_read_procmem_helper("P1-PUDS", IFXMIPS_GPIO_P1_PUDSEL, &buf[len]);
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len += ifxmips_port_read_procmem_helper("P0-ALT0", IFXMIPS_GPIO_P0_ALTSEL0, &buf[len]);
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len += ifxmips_port_read_procmem_helper("P1-ALT0", IFXMIPS_GPIO_P1_ALTSEL0, &buf[len]);
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len += ifxmips_port_read_procmem_helper("P0-ALT1", IFXMIPS_GPIO_P0_ALTSEL1, &buf[len]);
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len += ifxmips_port_read_procmem_helper("P1-ALT1", IFXMIPS_GPIO_P1_ALTSEL1, &buf[len]);
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len = len + sprintf (buf + len, "\n\n");
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*eof = 1;
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return len;
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}
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static int
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ifxmips_port_open (struct inode *inode, struct file *filep)
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{
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return 0;
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}
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static int
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ifxmips_port_release (struct inode *inode, struct file *filelp)
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{
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return 0;
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}
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static int
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ifxmips_port_ioctl (struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg)
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{
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int ret = 0;
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volatile struct ifxmips_port_ioctl_parm parm;
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if (_IOC_TYPE (cmd) != IFXMIPS_PORT_IOC_MAGIC)
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return -EINVAL;
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if (_IOC_DIR (cmd) & _IOC_WRITE) {
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if (!access_ok
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(VERIFY_READ, arg,
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sizeof (struct ifxmips_port_ioctl_parm)))
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return -EFAULT;
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ret = copy_from_user ((void *) &parm, (void *) arg,
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sizeof (struct ifxmips_port_ioctl_parm));
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}
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if (_IOC_DIR (cmd) & _IOC_READ) {
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if (!access_ok
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(VERIFY_WRITE, arg,
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sizeof (struct ifxmips_port_ioctl_parm)))
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return -EFAULT;
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}
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if (down_trylock (&port_sem) != 0)
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return -EBUSY;
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switch (cmd) {
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case IFXMIPS_PORT_IOCOD:
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if (parm.value == 0x00)
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ifxmips_port_clear_open_drain(parm.port, parm.pin);
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else
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ifxmips_port_set_open_drain(parm.port, parm.pin);
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break;
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case IFXMIPS_PORT_IOCPUDSEL:
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if (parm.value == 0x00)
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ifxmips_port_clear_pudsel(parm.port, parm.pin);
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else
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ifxmips_port_set_pudsel(parm.port, parm.pin);
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break;
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case IFXMIPS_PORT_IOCPUDEN:
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if (parm.value == 0x00)
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ifxmips_port_clear_puden(parm.port, parm.pin);
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else
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ifxmips_port_set_puden(parm.port, parm.pin);
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break;
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case IFXMIPS_PORT_IOCSTOFF:
|
|
if (parm.value == 0x00)
|
|
ifxmips_port_clear_stoff(parm.port, parm.pin);
|
|
else
|
|
ifxmips_port_set_stoff(parm.port, parm.pin);
|
|
break;
|
|
|
|
case IFXMIPS_PORT_IOCDIR:
|
|
if (parm.value == 0x00)
|
|
ifxmips_port_set_dir_in(parm.port, parm.pin);
|
|
else
|
|
ifxmips_port_set_dir_out(parm.port, parm.pin);
|
|
break;
|
|
|
|
case IFXMIPS_PORT_IOCOUTPUT:
|
|
if (parm.value == 0x00)
|
|
ifxmips_port_clear_output(parm.port, parm.pin);
|
|
else
|
|
ifxmips_port_set_output(parm.port, parm.pin);
|
|
break;
|
|
|
|
case IFXMIPS_PORT_IOCALTSEL0:
|
|
if (parm.value == 0x00)
|
|
ifxmips_port_clear_altsel0(parm.port, parm.pin);
|
|
else
|
|
ifxmips_port_set_altsel0(parm.port, parm.pin);
|
|
break;
|
|
|
|
case IFXMIPS_PORT_IOCALTSEL1:
|
|
if (parm.value == 0x00)
|
|
ifxmips_port_clear_altsel1(parm.port, parm.pin);
|
|
else
|
|
ifxmips_port_set_altsel1(parm.port, parm.pin);
|
|
break;
|
|
|
|
case IFXMIPS_PORT_IOCINPUT:
|
|
parm.value = ifxmips_port_get_input(parm.port, parm.pin);
|
|
copy_to_user((void*)arg, (void*)&parm,
|
|
sizeof(struct ifxmips_port_ioctl_parm));
|
|
break;
|
|
|
|
default:
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
up (&port_sem);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct file_operations port_fops = {
|
|
.open = ifxmips_port_open,
|
|
.release = ifxmips_port_release,
|
|
.ioctl = ifxmips_port_ioctl
|
|
};
|
|
|
|
static int
|
|
ifxmips_gpio_probe (struct platform_device *dev)
|
|
{
|
|
int retval = 0;
|
|
|
|
sema_init (&port_sem, 1);
|
|
|
|
ifxmips_gpio_major = register_chrdev(0, DRVNAME, &port_fops);
|
|
if (!ifxmips_gpio_major)
|
|
{
|
|
printk(KERN_INFO DRVNAME ": Error! Could not register port device. #%d\n", ifxmips_gpio_major);
|
|
retval = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
create_proc_read_entry(DRVNAME, 0, NULL, ifxmips_port_read_procmem, NULL);
|
|
|
|
#ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
|
|
ifxmips_port_set_open_drain(IFXMIPS_RST_PORT, IFXMIPS_RST_PIN);
|
|
ifxmips_port_clear_altsel0(IFXMIPS_RST_PORT, IFXMIPS_RST_PIN);
|
|
ifxmips_port_clear_altsel1(IFXMIPS_RST_PORT, IFXMIPS_RST_PIN);
|
|
ifxmips_port_set_dir_in(IFXMIPS_RST_PORT, IFXMIPS_RST_PIN);
|
|
|
|
seen = jiffies;
|
|
|
|
init_timer(&rst_button_timer);
|
|
rst_button_timer.function = reset_button_poll;
|
|
rst_button_timer.expires = jiffies + HZ;
|
|
add_timer(&rst_button_timer);
|
|
#endif
|
|
|
|
printk(KERN_INFO DRVNAME ": device successfully initialized #%d.\n", ifxmips_gpio_major);
|
|
|
|
out:
|
|
return retval;
|
|
}
|
|
|
|
static int
|
|
ifxmips_gpio_remove (struct platform_device *pdev)
|
|
{
|
|
#ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
|
|
del_timer_sync(&rst_button_timer);
|
|
#endif
|
|
unregister_chrdev(ifxmips_gpio_major, DRVNAME);
|
|
remove_proc_entry(DRVNAME, NULL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct
|
|
platform_driver ifxmips_gpio_driver = {
|
|
.probe = ifxmips_gpio_probe,
|
|
.remove = ifxmips_gpio_remove,
|
|
.driver = {
|
|
.name = DRVNAME,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
int __init
|
|
ifxmips_gpio_init (void)
|
|
{
|
|
int ret = platform_driver_register(&ifxmips_gpio_driver);
|
|
if (ret)
|
|
printk(KERN_INFO DRVNAME ": Error registering platfom driver!");
|
|
return ret;
|
|
}
|
|
|
|
void __exit
|
|
ifxmips_gpio_exit (void)
|
|
{
|
|
platform_driver_unregister(&ifxmips_gpio_driver);
|
|
}
|
|
|
|
module_init(ifxmips_gpio_init);
|
|
module_exit(ifxmips_gpio_exit);
|