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 <asm/uaccess.h>
39 #include <asm/semaphore.h>
40 #include <asm/uaccess.h>
41 #include <asm/ifxmips/ifxmips.h>
42 #include <asm/ifxmips/ifxmips_ioctl.h>
45 #define PINS_PER_PORT 16
47 #ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
48 #define IFXMIPS_RST_PIN 15
49 #define IFXMIPS_RST_PORT 1
51 static struct timer_list rst_button_timer
;
53 extern struct sock
*uevent_sock
;
54 extern u64
uevent_next_seqnum(void);
55 static unsigned long seen
;
56 static int pressed
= 0;
59 struct work_struct wq
;
61 unsigned long jiffies
;
65 #define IFXMIPS_GPIO_SANITY {if (port > MAX_PORTS || pin > PINS_PER_PORT) return -EINVAL; }
67 ifxmips_port_reserve_pin(unsigned int port
, unsigned int pin
)
70 printk("%s : call to obseleted function\n", __func__
);
73 EXPORT_SYMBOL(ifxmips_port_reserve_pin
);
76 ifxmips_port_free_pin(unsigned int port
, unsigned int pin
)
79 printk("%s : call to obseleted function\n", __func__
);
82 EXPORT_SYMBOL(ifxmips_port_free_pin
);
85 ifxmips_port_set_open_drain(unsigned int port
, unsigned int pin
)
88 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OD
+ (port
* 0xC)) | (1 << pin
),
89 IFXMIPS_GPIO_P0_OD
+ (port
* 0xC));
92 EXPORT_SYMBOL(ifxmips_port_set_open_drain
);
95 ifxmips_port_clear_open_drain(unsigned int port
, unsigned int pin
)
98 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OD
+ (port
* 0xC)) & ~(1 << pin
),
99 IFXMIPS_GPIO_P0_OD
+ (port
* 0xC));
102 EXPORT_SYMBOL(ifxmips_port_clear_open_drain
);
105 ifxmips_port_set_pudsel(unsigned int port
, unsigned int pin
)
108 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDSEL
+ (port
* 0xC)) | (1 << pin
),
109 IFXMIPS_GPIO_P0_PUDSEL
+ (port
* 0xC));
112 EXPORT_SYMBOL(ifxmips_port_set_pudsel
);
115 ifxmips_port_clear_pudsel (unsigned int port
, unsigned int pin
)
118 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDSEL
+ (port
* 0xC)) & ~(1 << pin
),
119 IFXMIPS_GPIO_P0_PUDSEL
+ (port
* 0xC));
122 EXPORT_SYMBOL(ifxmips_port_clear_pudsel
);
125 ifxmips_port_set_puden(unsigned int port
, unsigned int pin
)
128 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDEN
+ (port
* 0xC)) | (1 << pin
),
129 IFXMIPS_GPIO_P0_PUDEN
+ (port
* 0xC));
132 EXPORT_SYMBOL(ifxmips_port_set_puden
);
135 ifxmips_port_clear_puden(unsigned int port
, unsigned int pin
)
138 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDEN
+ (port
* 0xC)) & ~(1 << pin
),
139 IFXMIPS_GPIO_P0_PUDEN
+ (port
* 0xC));
142 EXPORT_SYMBOL(ifxmips_port_clear_puden
);
145 ifxmips_port_set_stoff(unsigned int port
, unsigned int pin
)
148 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_STOFF
+ (port
* 0xC)) | (1 << pin
),
149 IFXMIPS_GPIO_P0_STOFF
+ (port
* 0xC));
152 EXPORT_SYMBOL(ifxmips_port_set_stoff
);
155 ifxmips_port_clear_stoff(unsigned int port
, unsigned int pin
)
158 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_STOFF
+ (port
* 0xC)) & ~(1 << pin
),
159 IFXMIPS_GPIO_P0_STOFF
+ (port
* 0xC));
162 EXPORT_SYMBOL(ifxmips_port_clear_stoff
);
165 ifxmips_port_set_dir_out(unsigned int port
, unsigned int pin
)
168 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_DIR
+ (port
* 0xC)) | (1 << pin
),
169 IFXMIPS_GPIO_P0_DIR
+ (port
* 0xC));
172 EXPORT_SYMBOL(ifxmips_port_set_dir_out
);
175 ifxmips_port_set_dir_in(unsigned int port
, unsigned int pin
)
178 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_DIR
+ (port
* 0xC)) & ~(1 << pin
),
179 IFXMIPS_GPIO_P0_DIR
+ (port
* 0xC));
182 EXPORT_SYMBOL(ifxmips_port_set_dir_in
);
185 ifxmips_port_set_output(unsigned int port
, unsigned int pin
)
188 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OUT
+ (port
* 0xC)) | (1 << pin
),
189 IFXMIPS_GPIO_P0_OUT
+ (port
* 0xC));
192 EXPORT_SYMBOL(ifxmips_port_set_output
);
195 ifxmips_port_clear_output(unsigned int port
, unsigned int pin
)
198 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OUT
+ (port
* 0xC)) & ~(1 << pin
),
199 IFXMIPS_GPIO_P0_OUT
+ (port
* 0xC));
202 EXPORT_SYMBOL(ifxmips_port_clear_output
);
205 ifxmips_port_get_input(unsigned int port
, unsigned int pin
)
208 if (ifxmips_r32(IFXMIPS_GPIO_P0_IN
+ (port
* 0xC)) & (1 << pin
))
213 EXPORT_SYMBOL(ifxmips_port_get_input
);
216 ifxmips_port_set_altsel0(unsigned int port
, unsigned int pin
)
219 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL0
+ (port
* 0xC)) | (1 << pin
),
220 IFXMIPS_GPIO_P0_ALTSEL0
+ (port
* 0xC));
223 EXPORT_SYMBOL(ifxmips_port_set_altsel0
);
226 ifxmips_port_clear_altsel0(unsigned int port
, unsigned int pin
)
229 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL0
+ (port
* 0xC)) & ~(1 << pin
),
230 IFXMIPS_GPIO_P0_ALTSEL0
+ (port
* 0xC));
233 EXPORT_SYMBOL(ifxmips_port_clear_altsel0
);
236 ifxmips_port_set_altsel1(unsigned int port
, unsigned int pin
)
239 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL1
+ (port
* 0xC)) | (1 << pin
),
240 IFXMIPS_GPIO_P0_ALTSEL1
+ (port
* 0xC));
243 EXPORT_SYMBOL(ifxmips_port_set_altsel1
);
246 ifxmips_port_clear_altsel1(unsigned int port
, unsigned int pin
)
249 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL1
+ (port
* 0xC)) & ~(1 << pin
),
250 IFXMIPS_GPIO_P0_ALTSEL1
+ (port
* 0xC));
253 EXPORT_SYMBOL(ifxmips_port_clear_altsel1
);
255 #ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
257 add_msg(struct sk_buff
*skb
, char *msg
)
260 scratch
= skb_put(skb
, strlen(msg
) + 1);
261 sprintf(scratch
, msg
);
265 hotplug_button(struct work_struct
*wq
)
268 struct event_t
*event
;
273 event
= container_of(wq
, struct event_t
, wq
);
277 s
= event
->set
? "pressed" : "released";
279 skb
= alloc_skb(len
+ 2048, GFP_KERNEL
);
283 scratch
= skb_put(skb
, len
);
284 sprintf(scratch
, "%s@",s
);
285 add_msg(skb
, "HOME=/");
286 add_msg(skb
, "PATH=/sbin:/bin:/usr/sbin:/usr/bin");
287 add_msg(skb
, "SUBSYSTEM=button");
288 add_msg(skb
, "BUTTON=reset");
289 add_msg(skb
, (event
->set
? "ACTION=pressed" : "ACTION=released"));
290 sprintf(buf
, "SEEN=%ld", (event
->jiffies
- seen
)/HZ
);
292 snprintf(buf
, 128, "SEQNUM=%llu", uevent_next_seqnum());
295 NETLINK_CB(skb
).dst_group
= 1;
296 netlink_broadcast(uevent_sock
, skb
, 0, 1, GFP_KERNEL
);
302 reset_button_poll(unsigned long unused
)
304 struct event_t
*event
;
306 rst_button_timer
.expires
= jiffies
+ HZ
;
307 add_timer(&rst_button_timer
);
309 if (pressed
!= ifxmips_port_get_input(IFXMIPS_RST_PORT
, IFXMIPS_RST_PIN
))
315 printk("reset button was %s\n", (pressed
? "pressed" : "released"));
316 event
= (struct event_t
*) kzalloc(sizeof(struct event_t
), GFP_ATOMIC
);
319 printk("Could not alloc hotplug event\n");
322 event
->set
= pressed
;
323 event
->jiffies
= jiffies
;
324 INIT_WORK(&event
->wq
, (void *)(void *)hotplug_button
);
325 schedule_work(&event
->wq
);
332 ifxmips_gpio_probe(struct platform_device
*dev
)
336 #ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
337 ifxmips_port_set_open_drain(IFXMIPS_RST_PORT
, IFXMIPS_RST_PIN
);
338 ifxmips_port_clear_altsel0(IFXMIPS_RST_PORT
, IFXMIPS_RST_PIN
);
339 ifxmips_port_clear_altsel1(IFXMIPS_RST_PORT
, IFXMIPS_RST_PIN
);
340 ifxmips_port_set_dir_in(IFXMIPS_RST_PORT
, IFXMIPS_RST_PIN
);
342 init_timer(&rst_button_timer
);
343 rst_button_timer
.function
= reset_button_poll
;
344 rst_button_timer
.expires
= jiffies
+ HZ
;
345 add_timer(&rst_button_timer
);
351 ifxmips_gpio_remove(struct platform_device
*pdev
)
353 #ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
354 del_timer_sync(&rst_button_timer
);
360 platform_driver ifxmips_gpio_driver
= {
361 .probe
= ifxmips_gpio_probe
,
362 .remove
= ifxmips_gpio_remove
,
364 .name
= "ifxmips_gpio",
365 .owner
= THIS_MODULE
,
370 ifxmips_gpio_init(void)
372 int ret
= platform_driver_register(&ifxmips_gpio_driver
);
374 printk(KERN_INFO
"ifxmips_gpio : Error registering platfom driver!");
379 ifxmips_gpio_exit(void)
381 platform_driver_unregister(&ifxmips_gpio_driver
);
384 module_init(ifxmips_gpio_init
);
385 module_exit(ifxmips_gpio_exit
);