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
);