2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
16 * Copyright (C) 2004 btxu Generate from INCA-IP project
17 * Copyright (C) 2005 Jin-Sze.Sow Comments edited
18 * Copyright (C) 2006 Huang Xiaogang Modification & verification on Danube chip
19 * Copyright (C) 2007 John Crispin <blogic@openwrt.org>
22 #include <linux/module.h>
23 #include <linux/types.h>
24 #include <linux/errno.h>
25 #include <linux/proc_fs.h>
26 #include <linux/init.h>
27 #include <linux/ioctl.h>
28 #include <linux/timer.h>
29 #include <linux/module.h>
30 #include <linux/timer.h>
31 #include <linux/interrupt.h>
32 #include <linux/kobject.h>
33 #include <linux/workqueue.h>
34 #include <linux/skbuff.h>
35 #include <linux/netlink.h>
36 #include <linux/platform_device.h>
38 #include <linux/uaccess.h>
39 #include <linux/semaphore.h>
40 #include <asm/ifxmips/ifxmips.h>
43 #define PINS_PER_PORT 16
45 #ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
47 unsigned int rst_port = 1;
48 unsigned int rst_pin = 15;
49 static struct timer_list rst_button_timer;
51 extern struct sock *uevent_sock;
52 extern u64 uevent_next_seqnum(void);
53 static unsigned long seen;
54 static int pressed = 0;
57 struct work_struct wq;
59 unsigned long jiffies;
63 #define IFXMIPS_GPIO_SANITY {if (port > MAX_PORTS || pin > PINS_PER_PORT) return -EINVAL; }
65 ifxmips_port_reserve_pin(unsigned int port, unsigned int pin)
68 printk("%s : call to obseleted function\n", __func__);
71 EXPORT_SYMBOL(ifxmips_port_reserve_pin);
74 ifxmips_port_free_pin(unsigned int port, unsigned int pin)
77 printk("%s : call to obseleted function\n", __func__);
80 EXPORT_SYMBOL(ifxmips_port_free_pin);
83 ifxmips_port_set_open_drain(unsigned int port, unsigned int pin)
86 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OD + (port * 0xC)) | (1 << pin),
87 IFXMIPS_GPIO_P0_OD + (port * 0xC));
90 EXPORT_SYMBOL(ifxmips_port_set_open_drain);
93 ifxmips_port_clear_open_drain(unsigned int port, unsigned int pin)
96 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OD + (port * 0xC)) & ~(1 << pin),
97 IFXMIPS_GPIO_P0_OD + (port * 0xC));
100 EXPORT_SYMBOL(ifxmips_port_clear_open_drain);
103 ifxmips_port_set_pudsel(unsigned int port, unsigned int pin)
106 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC)) | (1 << pin),
107 IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC));
110 EXPORT_SYMBOL(ifxmips_port_set_pudsel);
113 ifxmips_port_clear_pudsel (unsigned int port, unsigned int pin)
116 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC)) & ~(1 << pin),
117 IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC));
120 EXPORT_SYMBOL(ifxmips_port_clear_pudsel);
123 ifxmips_port_set_puden(unsigned int port, unsigned int pin)
126 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDEN + (port * 0xC)) | (1 << pin),
127 IFXMIPS_GPIO_P0_PUDEN + (port * 0xC));
130 EXPORT_SYMBOL(ifxmips_port_set_puden);
133 ifxmips_port_clear_puden(unsigned int port, unsigned int pin)
136 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDEN + (port * 0xC)) & ~(1 << pin),
137 IFXMIPS_GPIO_P0_PUDEN + (port * 0xC));
140 EXPORT_SYMBOL(ifxmips_port_clear_puden);
143 ifxmips_port_set_stoff(unsigned int port, unsigned int pin)
146 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_STOFF + (port * 0xC)) | (1 << pin),
147 IFXMIPS_GPIO_P0_STOFF + (port * 0xC));
150 EXPORT_SYMBOL(ifxmips_port_set_stoff);
153 ifxmips_port_clear_stoff(unsigned int port, unsigned int pin)
156 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_STOFF + (port * 0xC)) & ~(1 << pin),
157 IFXMIPS_GPIO_P0_STOFF + (port * 0xC));
160 EXPORT_SYMBOL(ifxmips_port_clear_stoff);
163 ifxmips_port_set_dir_out(unsigned int port, unsigned int pin)
166 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_DIR + (port * 0xC)) | (1 << pin),
167 IFXMIPS_GPIO_P0_DIR + (port * 0xC));
170 EXPORT_SYMBOL(ifxmips_port_set_dir_out);
173 ifxmips_port_set_dir_in(unsigned int port, unsigned int pin)
176 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_DIR + (port * 0xC)) & ~(1 << pin),
177 IFXMIPS_GPIO_P0_DIR + (port * 0xC));
180 EXPORT_SYMBOL(ifxmips_port_set_dir_in);
183 ifxmips_port_set_output(unsigned int port, unsigned int pin)
186 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OUT + (port * 0xC)) | (1 << pin),
187 IFXMIPS_GPIO_P0_OUT + (port * 0xC));
190 EXPORT_SYMBOL(ifxmips_port_set_output);
193 ifxmips_port_clear_output(unsigned int port, unsigned int pin)
196 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OUT + (port * 0xC)) & ~(1 << pin),
197 IFXMIPS_GPIO_P0_OUT + (port * 0xC));
200 EXPORT_SYMBOL(ifxmips_port_clear_output);
203 ifxmips_port_get_input(unsigned int port, unsigned int pin)
206 if (ifxmips_r32(IFXMIPS_GPIO_P0_IN + (port * 0xC)) & (1 << pin))
211 EXPORT_SYMBOL(ifxmips_port_get_input);
214 ifxmips_port_set_altsel0(unsigned int port, unsigned int pin)
217 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC)) | (1 << pin),
218 IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC));
221 EXPORT_SYMBOL(ifxmips_port_set_altsel0);
224 ifxmips_port_clear_altsel0(unsigned int port, unsigned int pin)
227 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC)) & ~(1 << pin),
228 IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC));
231 EXPORT_SYMBOL(ifxmips_port_clear_altsel0);
234 ifxmips_port_set_altsel1(unsigned int port, unsigned int pin)
237 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC)) | (1 << pin),
238 IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC));
241 EXPORT_SYMBOL(ifxmips_port_set_altsel1);
244 ifxmips_port_clear_altsel1(unsigned int port, unsigned int pin)
247 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC)) & ~(1 << pin),
248 IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC));
251 EXPORT_SYMBOL(ifxmips_port_clear_altsel1);
253 #ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
255 add_msg(struct sk_buff *skb, char *msg)
258 scratch = skb_put(skb, strlen(msg) + 1);
259 sprintf(scratch, msg);
263 hotplug_button(struct work_struct *wq)
266 struct event_t *event;
271 event = container_of(wq, struct event_t, wq);
275 s = event->set ? "pressed" : "released";
277 skb = alloc_skb(len + 2048, GFP_KERNEL);
281 scratch = skb_put(skb, len);
282 sprintf(scratch, "%s@",s);
283 add_msg(skb, "HOME=/");
284 add_msg(skb, "PATH=/sbin:/bin:/usr/sbin:/usr/bin");
285 add_msg(skb, "SUBSYSTEM=button");
286 add_msg(skb, "BUTTON=reset");
287 add_msg(skb, (event->set ? "ACTION=pressed" : "ACTION=released"));
288 sprintf(buf, "SEEN=%ld", (event->jiffies - seen)/HZ);
290 snprintf(buf, 128, "SEQNUM=%llu", uevent_next_seqnum());
293 NETLINK_CB(skb).dst_group = 1;
294 netlink_broadcast(uevent_sock, skb, 0, 1, GFP_KERNEL);
300 reset_button_poll(unsigned long unused)
302 struct event_t *event;
304 rst_button_timer.expires = jiffies + (HZ / 4);
305 add_timer(&rst_button_timer);
307 if (pressed != ifxmips_port_get_input(rst_port, rst_pin))
313 event = (struct event_t *) kzalloc(sizeof(struct event_t), GFP_ATOMIC);
316 printk("Could not alloc hotplug event\n");
319 event->set = pressed;
320 event->jiffies = jiffies;
321 INIT_WORK(&event->wq, (void *)(void *)hotplug_button);
322 schedule_work(&event->wq);
329 ifxmips_gpio_probe(struct platform_device *dev)
333 #ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
334 rst_port = dev->resource[0].start;
335 rst_pin = dev->resource[0].end;
336 ifxmips_port_set_open_drain(rst_port, rst_pin);
337 ifxmips_port_clear_altsel0(rst_port, rst_pin);
338 ifxmips_port_clear_altsel1(rst_port, rst_pin);
339 ifxmips_port_set_dir_in(rst_port, rst_pin);
341 init_timer(&rst_button_timer);
342 rst_button_timer.function = reset_button_poll;
343 rst_button_timer.expires = jiffies + HZ;
344 add_timer(&rst_button_timer);
350 ifxmips_gpio_remove(struct platform_device *pdev)
352 #ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
353 del_timer_sync(&rst_button_timer);
359 platform_driver ifxmips_gpio_driver = {
360 .probe = ifxmips_gpio_probe,
361 .remove = ifxmips_gpio_remove,
363 .name = "ifxmips_gpio",
364 .owner = THIS_MODULE,
369 ifxmips_gpio_init(void)
371 int ret = platform_driver_register(&ifxmips_gpio_driver);
373 printk(KERN_INFO "ifxmips_gpio : Error registering platfom driver!");
378 ifxmips_gpio_exit(void)
380 platform_driver_unregister(&ifxmips_gpio_driver);
383 module_init(ifxmips_gpio_init);
384 module_exit(ifxmips_gpio_exit);