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>
37 #include <linux/uaccess.h>
38 #include <linux/semaphore.h>
45 #define PINS_PER_PORT 16
47 #ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
49 unsigned int rst_port
= 1;
50 unsigned int rst_pin
= 15;
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
;
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 int ifxmips_port_reserve_pin(unsigned int port
, unsigned int pin
)
70 printk(KERN_INFO
"%s : call to obseleted function\n", __func__
);
73 EXPORT_SYMBOL(ifxmips_port_reserve_pin
);
75 int ifxmips_port_free_pin(unsigned int port
, unsigned int pin
)
78 printk(KERN_INFO
"%s : call to obseleted function\n", __func__
);
81 EXPORT_SYMBOL(ifxmips_port_free_pin
);
83 int 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
);
92 int ifxmips_port_clear_open_drain(unsigned int port
, unsigned int pin
)
95 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OD
+ (port
* 0xC)) & ~(1 << pin
),
96 IFXMIPS_GPIO_P0_OD
+ (port
* 0xC));
99 EXPORT_SYMBOL(ifxmips_port_clear_open_drain
);
101 int ifxmips_port_set_pudsel(unsigned int port
, unsigned int pin
)
104 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDSEL
+ (port
* 0xC)) | (1 << pin
),
105 IFXMIPS_GPIO_P0_PUDSEL
+ (port
* 0xC));
108 EXPORT_SYMBOL(ifxmips_port_set_pudsel
);
110 int ifxmips_port_clear_pudsel(unsigned int port
, unsigned int pin
)
113 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDSEL
+ (port
* 0xC)) & ~(1 << pin
),
114 IFXMIPS_GPIO_P0_PUDSEL
+ (port
* 0xC));
117 EXPORT_SYMBOL(ifxmips_port_clear_pudsel
);
119 int ifxmips_port_set_puden(unsigned int port
, unsigned int pin
)
122 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDEN
+ (port
* 0xC)) | (1 << pin
),
123 IFXMIPS_GPIO_P0_PUDEN
+ (port
* 0xC));
126 EXPORT_SYMBOL(ifxmips_port_set_puden
);
128 int ifxmips_port_clear_puden(unsigned int port
, unsigned int pin
)
131 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDEN
+ (port
* 0xC)) & ~(1 << pin
),
132 IFXMIPS_GPIO_P0_PUDEN
+ (port
* 0xC));
135 EXPORT_SYMBOL(ifxmips_port_clear_puden
);
137 int ifxmips_port_set_stoff(unsigned int port
, unsigned int pin
)
140 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_STOFF
+ (port
* 0xC)) | (1 << pin
),
141 IFXMIPS_GPIO_P0_STOFF
+ (port
* 0xC));
144 EXPORT_SYMBOL(ifxmips_port_set_stoff
);
146 int ifxmips_port_clear_stoff(unsigned int port
, unsigned int pin
)
149 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_STOFF
+ (port
* 0xC)) & ~(1 << pin
),
150 IFXMIPS_GPIO_P0_STOFF
+ (port
* 0xC));
153 EXPORT_SYMBOL(ifxmips_port_clear_stoff
);
155 int ifxmips_port_set_dir_out(unsigned int port
, unsigned int pin
)
158 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_DIR
+ (port
* 0xC)) | (1 << pin
),
159 IFXMIPS_GPIO_P0_DIR
+ (port
* 0xC));
162 EXPORT_SYMBOL(ifxmips_port_set_dir_out
);
164 int ifxmips_port_set_dir_in(unsigned int port
, unsigned int pin
)
167 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_DIR
+ (port
* 0xC)) & ~(1 << pin
),
168 IFXMIPS_GPIO_P0_DIR
+ (port
* 0xC));
171 EXPORT_SYMBOL(ifxmips_port_set_dir_in
);
173 int ifxmips_port_set_output(unsigned int port
, unsigned int pin
)
176 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OUT
+ (port
* 0xC)) | (1 << pin
),
177 IFXMIPS_GPIO_P0_OUT
+ (port
* 0xC));
180 EXPORT_SYMBOL(ifxmips_port_set_output
);
182 int ifxmips_port_clear_output(unsigned int port
, unsigned int pin
)
185 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OUT
+ (port
* 0xC)) & ~(1 << pin
),
186 IFXMIPS_GPIO_P0_OUT
+ (port
* 0xC));
189 EXPORT_SYMBOL(ifxmips_port_clear_output
);
191 int ifxmips_port_get_input(unsigned int port
, unsigned int pin
)
194 if (ifxmips_r32(IFXMIPS_GPIO_P0_IN
+ (port
* 0xC)) & (1 << pin
))
199 EXPORT_SYMBOL(ifxmips_port_get_input
);
201 int ifxmips_port_set_altsel0(unsigned int port
, unsigned int pin
)
204 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL0
+ (port
* 0xC)) | (1 << pin
),
205 IFXMIPS_GPIO_P0_ALTSEL0
+ (port
* 0xC));
208 EXPORT_SYMBOL(ifxmips_port_set_altsel0
);
210 int ifxmips_port_clear_altsel0(unsigned int port
, unsigned int pin
)
213 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL0
+ (port
* 0xC)) & ~(1 << pin
),
214 IFXMIPS_GPIO_P0_ALTSEL0
+ (port
* 0xC));
217 EXPORT_SYMBOL(ifxmips_port_clear_altsel0
);
219 int ifxmips_port_set_altsel1(unsigned int port
, unsigned int pin
)
222 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL1
+ (port
* 0xC)) | (1 << pin
),
223 IFXMIPS_GPIO_P0_ALTSEL1
+ (port
* 0xC));
226 EXPORT_SYMBOL(ifxmips_port_set_altsel1
);
228 int ifxmips_port_clear_altsel1(unsigned int port
, unsigned int pin
)
231 ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL1
+ (port
* 0xC)) & ~(1 << pin
),
232 IFXMIPS_GPIO_P0_ALTSEL1
+ (port
* 0xC));
235 EXPORT_SYMBOL(ifxmips_port_clear_altsel1
);
237 #ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
238 static inline void add_msg(struct sk_buff
*skb
, char *msg
)
241 scratch
= skb_put(skb
, strlen(msg
) + 1);
242 sprintf(scratch
, msg
);
245 static void hotplug_button(struct work_struct
*wq
)
248 struct event_t
*event
;
253 event
= container_of(wq
, struct event_t
, wq
);
257 s
= event
->set
? "pressed" : "released";
259 skb
= alloc_skb(len
+ 2048, GFP_KERNEL
);
263 scratch
= skb_put(skb
, len
);
264 sprintf(scratch
, "%s@", s
);
265 add_msg(skb
, "HOME=/");
266 add_msg(skb
, "PATH=/sbin:/bin:/usr/sbin:/usr/bin");
267 add_msg(skb
, "SUBSYSTEM=button");
268 add_msg(skb
, "BUTTON=reset");
269 add_msg(skb
, (event
->set
? "ACTION=pressed" : "ACTION=released"));
270 sprintf(buf
, "SEEN=%ld", (event
->jiffies
- seen
)/HZ
);
272 snprintf(buf
, 128, "SEQNUM=%llu", uevent_next_seqnum());
275 NETLINK_CB(skb
).dst_group
= 1;
276 netlink_broadcast(uevent_sock
, skb
, 0, 1, GFP_KERNEL
);
281 static void reset_button_poll(unsigned long unused
)
283 struct event_t
*event
;
285 rst_button_timer
.expires
= jiffies
+ (HZ
/ 4);
286 add_timer(&rst_button_timer
);
288 if (pressed
!= ifxmips_port_get_input(rst_port
, rst_pin
)) {
293 event
= kzalloc(sizeof(struct event_t
), GFP_ATOMIC
);
295 printk(KERN_INFO
"Could not alloc hotplug event\n");
298 event
->set
= pressed
;
299 event
->jiffies
= jiffies
;
300 INIT_WORK(&event
->wq
, (void *)(void *)hotplug_button
);
301 schedule_work(&event
->wq
);
307 static int ifxmips_gpio_probe(struct platform_device
*dev
)
311 #ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
312 rst_port
= dev
->resource
[0].start
;
313 rst_pin
= dev
->resource
[0].end
;
314 ifxmips_port_set_open_drain(rst_port
, rst_pin
);
315 ifxmips_port_clear_altsel0(rst_port
, rst_pin
);
316 ifxmips_port_clear_altsel1(rst_port
, rst_pin
);
317 ifxmips_port_set_dir_in(rst_port
, rst_pin
);
319 init_timer(&rst_button_timer
);
320 rst_button_timer
.function
= reset_button_poll
;
321 rst_button_timer
.expires
= jiffies
+ HZ
;
322 add_timer(&rst_button_timer
);
327 static int ifxmips_gpio_remove(struct platform_device
*pdev
)
329 #ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
330 del_timer_sync(&rst_button_timer
);
335 static struct platform_driver ifxmips_gpio_driver
= {
336 .probe
= ifxmips_gpio_probe
,
337 .remove
= ifxmips_gpio_remove
,
339 .name
= "ifxmips_gpio",
340 .owner
= THIS_MODULE
,
344 int __init
ifxmips_gpio_init(void)
346 int ret
= platform_driver_register(&ifxmips_gpio_driver
);
348 printk(KERN_INFO
"ifxmips_gpio : Error registering platfom driver!");
352 void __exit
ifxmips_gpio_exit(void)
354 platform_driver_unregister(&ifxmips_gpio_driver
);
357 module_init(ifxmips_gpio_init
);
358 module_exit(ifxmips_gpio_exit
);