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
;
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 int ifxmips_port_reserve_pin(unsigned int port
, unsigned int pin
)
68 printk(KERN_INFO
"%s : call to obseleted function\n", __func__
);
71 EXPORT_SYMBOL(ifxmips_port_reserve_pin
);
73 int ifxmips_port_free_pin(unsigned int port
, unsigned int pin
)
76 printk(KERN_INFO
"%s : call to obseleted function\n", __func__
);
79 EXPORT_SYMBOL(ifxmips_port_free_pin
);
81 int ifxmips_port_set_open_drain(unsigned int port
, unsigned int pin
)
84 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OD
+ (port
* 0xC)) | (1 << pin
),
85 IFXMIPS_GPIO_P0_OD
+ (port
* 0xC));
88 EXPORT_SYMBOL(ifxmips_port_set_open_drain
);
90 int ifxmips_port_clear_open_drain(unsigned int port
, unsigned int pin
)
93 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OD
+ (port
* 0xC)) & ~(1 << pin
),
94 IFXMIPS_GPIO_P0_OD
+ (port
* 0xC));
97 EXPORT_SYMBOL(ifxmips_port_clear_open_drain
);
99 int ifxmips_port_set_pudsel(unsigned int port
, unsigned int pin
)
102 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDSEL
+ (port
* 0xC)) | (1 << pin
),
103 IFXMIPS_GPIO_P0_PUDSEL
+ (port
* 0xC));
106 EXPORT_SYMBOL(ifxmips_port_set_pudsel
);
108 int ifxmips_port_clear_pudsel(unsigned int port
, unsigned int pin
)
111 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDSEL
+ (port
* 0xC)) & ~(1 << pin
),
112 IFXMIPS_GPIO_P0_PUDSEL
+ (port
* 0xC));
115 EXPORT_SYMBOL(ifxmips_port_clear_pudsel
);
117 int ifxmips_port_set_puden(unsigned int port
, unsigned int pin
)
120 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDEN
+ (port
* 0xC)) | (1 << pin
),
121 IFXMIPS_GPIO_P0_PUDEN
+ (port
* 0xC));
124 EXPORT_SYMBOL(ifxmips_port_set_puden
);
126 int ifxmips_port_clear_puden(unsigned int port
, unsigned int pin
)
129 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDEN
+ (port
* 0xC)) & ~(1 << pin
),
130 IFXMIPS_GPIO_P0_PUDEN
+ (port
* 0xC));
133 EXPORT_SYMBOL(ifxmips_port_clear_puden
);
135 int ifxmips_port_set_stoff(unsigned int port
, unsigned int pin
)
138 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_STOFF
+ (port
* 0xC)) | (1 << pin
),
139 IFXMIPS_GPIO_P0_STOFF
+ (port
* 0xC));
142 EXPORT_SYMBOL(ifxmips_port_set_stoff
);
144 int ifxmips_port_clear_stoff(unsigned int port
, unsigned int pin
)
147 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_STOFF
+ (port
* 0xC)) & ~(1 << pin
),
148 IFXMIPS_GPIO_P0_STOFF
+ (port
* 0xC));
151 EXPORT_SYMBOL(ifxmips_port_clear_stoff
);
153 int ifxmips_port_set_dir_out(unsigned int port
, unsigned int pin
)
156 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_DIR
+ (port
* 0xC)) | (1 << pin
),
157 IFXMIPS_GPIO_P0_DIR
+ (port
* 0xC));
160 EXPORT_SYMBOL(ifxmips_port_set_dir_out
);
162 int ifxmips_port_set_dir_in(unsigned int port
, unsigned int pin
)
165 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_DIR
+ (port
* 0xC)) & ~(1 << pin
),
166 IFXMIPS_GPIO_P0_DIR
+ (port
* 0xC));
169 EXPORT_SYMBOL(ifxmips_port_set_dir_in
);
171 int ifxmips_port_set_output(unsigned int port
, unsigned int pin
)
174 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OUT
+ (port
* 0xC)) | (1 << pin
),
175 IFXMIPS_GPIO_P0_OUT
+ (port
* 0xC));
178 EXPORT_SYMBOL(ifxmips_port_set_output
);
180 int ifxmips_port_clear_output(unsigned int port
, unsigned int pin
)
183 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OUT
+ (port
* 0xC)) & ~(1 << pin
),
184 IFXMIPS_GPIO_P0_OUT
+ (port
* 0xC));
187 EXPORT_SYMBOL(ifxmips_port_clear_output
);
189 int ifxmips_port_get_input(unsigned int port
, unsigned int pin
)
192 if (ifxmips_r32(IFXMIPS_GPIO_P0_IN
+ (port
* 0xC)) & (1 << pin
))
197 EXPORT_SYMBOL(ifxmips_port_get_input
);
199 int ifxmips_port_set_altsel0(unsigned int port
, unsigned int pin
)
202 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL0
+ (port
* 0xC)) | (1 << pin
),
203 IFXMIPS_GPIO_P0_ALTSEL0
+ (port
* 0xC));
206 EXPORT_SYMBOL(ifxmips_port_set_altsel0
);
208 int ifxmips_port_clear_altsel0(unsigned int port
, unsigned int pin
)
211 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL0
+ (port
* 0xC)) & ~(1 << pin
),
212 IFXMIPS_GPIO_P0_ALTSEL0
+ (port
* 0xC));
215 EXPORT_SYMBOL(ifxmips_port_clear_altsel0
);
217 int ifxmips_port_set_altsel1(unsigned int port
, unsigned int pin
)
220 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL1
+ (port
* 0xC)) | (1 << pin
),
221 IFXMIPS_GPIO_P0_ALTSEL1
+ (port
* 0xC));
224 EXPORT_SYMBOL(ifxmips_port_set_altsel1
);
226 int ifxmips_port_clear_altsel1(unsigned int port
, unsigned int pin
)
229 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL1
+ (port
* 0xC)) & ~(1 << pin
),
230 IFXMIPS_GPIO_P0_ALTSEL1
+ (port
* 0xC));
233 EXPORT_SYMBOL(ifxmips_port_clear_altsel1
);
235 #ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
236 static inline void add_msg(struct sk_buff
*skb
, char *msg
)
239 scratch
= skb_put(skb
, strlen(msg
) + 1);
240 sprintf(scratch
, msg
);
243 static void hotplug_button(struct work_struct
*wq
)
246 struct event_t
*event
;
251 event
= container_of(wq
, struct event_t
, wq
);
255 s
= event
->set
? "pressed" : "released";
257 skb
= alloc_skb(len
+ 2048, GFP_KERNEL
);
261 scratch
= skb_put(skb
, len
);
262 sprintf(scratch
, "%s@", s
);
263 add_msg(skb
, "HOME=/");
264 add_msg(skb
, "PATH=/sbin:/bin:/usr/sbin:/usr/bin");
265 add_msg(skb
, "SUBSYSTEM=button");
266 add_msg(skb
, "BUTTON=reset");
267 add_msg(skb
, (event
->set
? "ACTION=pressed" : "ACTION=released"));
268 sprintf(buf
, "SEEN=%ld", (event
->jiffies
- seen
)/HZ
);
270 snprintf(buf
, 128, "SEQNUM=%llu", uevent_next_seqnum());
273 NETLINK_CB(skb
).dst_group
= 1;
274 netlink_broadcast(uevent_sock
, skb
, 0, 1, GFP_KERNEL
);
279 static void reset_button_poll(unsigned long unused
)
281 struct event_t
*event
;
283 rst_button_timer
.expires
= jiffies
+ (HZ
/ 4);
284 add_timer(&rst_button_timer
);
286 if (pressed
!= ifxmips_port_get_input(rst_port
, rst_pin
)) {
291 event
= kzalloc(sizeof(struct event_t
), GFP_ATOMIC
);
293 printk(KERN_INFO
"Could not alloc hotplug event\n");
296 event
->set
= pressed
;
297 event
->jiffies
= jiffies
;
298 INIT_WORK(&event
->wq
, (void *)(void *)hotplug_button
);
299 schedule_work(&event
->wq
);
305 static int ifxmips_gpio_probe(struct platform_device
*dev
)
309 #ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
310 rst_port
= dev
->resource
[0].start
;
311 rst_pin
= dev
->resource
[0].end
;
312 ifxmips_port_set_open_drain(rst_port
, rst_pin
);
313 ifxmips_port_clear_altsel0(rst_port
, rst_pin
);
314 ifxmips_port_clear_altsel1(rst_port
, rst_pin
);
315 ifxmips_port_set_dir_in(rst_port
, rst_pin
);
317 init_timer(&rst_button_timer
);
318 rst_button_timer
.function
= reset_button_poll
;
319 rst_button_timer
.expires
= jiffies
+ HZ
;
320 add_timer(&rst_button_timer
);
325 static int ifxmips_gpio_remove(struct platform_device
*pdev
)
327 #ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
328 del_timer_sync(&rst_button_timer
);
333 static struct platform_driver ifxmips_gpio_driver
= {
334 .probe
= ifxmips_gpio_probe
,
335 .remove
= ifxmips_gpio_remove
,
337 .name
= "ifxmips_gpio",
338 .owner
= THIS_MODULE
,
342 int __init
ifxmips_gpio_init(void)
344 int ret
= platform_driver_register(&ifxmips_gpio_driver
);
346 printk(KERN_INFO
"ifxmips_gpio : Error registering platfom driver!");
350 void __exit
ifxmips_gpio_exit(void)
352 platform_driver_unregister(&ifxmips_gpio_driver
);
355 module_init(ifxmips_gpio_init
);
356 module_exit(ifxmips_gpio_exit
);