target/linux/ifxmips/files/drivers/char/ifxmips_gpio.c

   1 /*
   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.
   6  *
   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.
  11  *
  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.
  15  *
  16  *   Copyright (C) 2005 infineon
  17  *   Copyright (C) 2007 John Crispin <blogic@openwrt.org>
  18  *
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/types.h>
  23 #include <linux/errno.h>
  24 #include <linux/proc_fs.h>
  25 #include <linux/init.h>
  26 #include <linux/ioctl.h>
  27 #include <linux/timer.h>
  28 #include <linux/module.h>
  29 #include <linux/timer.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/kobject.h>
  32 #include <linux/workqueue.h>
  33 #include <linux/skbuff.h>
  34 #include <linux/netlink.h>
  35 #include <linux/platform_device.h>
  36 #include <net/sock.h>
  37 #include <asm/uaccess.h>
  38 #include <asm/semaphore.h>
  39 #include <asm/uaccess.h>
  40 #include <asm/ifxmips/ifxmips.h>
  41 #include <asm/ifxmips/ifxmips_ioctl.h>
  42
  43 #define MAX_PORTS                       2
  44 #define PINS_PER_PORT           16
  45
  46 #define DRVNAME                         "ifxmips_gpio"
  47
  48 static unsigned int ifxmips_gpio_major = 0;
  49
  50 #ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
  51 #define IFXMIPS_RST_PIN 15
  52 #define IFXMIPS_RST_PORT 1
  53
  54 static struct timer_list rst_button_timer;
  55
  56 extern struct sock *uevent_sock;
  57 extern u64 uevent_next_seqnum(void);
  58 static unsigned long seen;
  59 static int pressed = 0;
  60
  61 struct event_t {
  62         struct work_struct wq;
  63         int set;
  64         unsigned long jiffies;
  65 };
  66 #endif
  67
  68 /* TODO do we need this ? */
  69 static struct semaphore port_sem;
  70
  71 /* TODO do we really need this ? return in a define is forbidden by coding style */
  72 #define IFXMIPS_GPIO_SANITY             {if (port > MAX_PORTS || pin > PINS_PER_PORT) return -EINVAL; }
  73
  74 int
  75 ifxmips_port_reserve_pin (unsigned int port, unsigned int pin)
  76 {
  77         IFXMIPS_GPIO_SANITY;
  78         printk("%s : call to obseleted function\n", __func__);
  79
  80         return 0;
  81 }
  82 EXPORT_SYMBOL(ifxmips_port_reserve_pin);
  83
  84 int
  85 ifxmips_port_free_pin (unsigned int port, unsigned int pin)
  86 {
  87         IFXMIPS_GPIO_SANITY;
  88         printk("%s : call to obseleted function\n", __func__);
  89
  90         return 0;
  91 }
  92 EXPORT_SYMBOL(ifxmips_port_free_pin);
  93
  94 int
  95 ifxmips_port_set_open_drain (unsigned int port, unsigned int pin)
  96 {
  97         IFXMIPS_GPIO_SANITY;
  98         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OD + (port * 0xC)) | (1 << pin), IFXMIPS_GPIO_P0_OD + (port * 0xC));
  99
 100         return 0;
 101 }
 102 EXPORT_SYMBOL(ifxmips_port_set_open_drain);
 103
 104 int
 105 ifxmips_port_clear_open_drain (unsigned int port, unsigned int pin)
 106 {
 107         IFXMIPS_GPIO_SANITY;
 108         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OD + (port * 0xC)) & ~(1 << pin), IFXMIPS_GPIO_P0_OD + (port * 0xC));
 109
 110         return 0;
 111 }
 112 EXPORT_SYMBOL(ifxmips_port_clear_open_drain);
 113
 114 int
 115 ifxmips_port_set_pudsel (unsigned int port, unsigned int pin)
 116 {
 117     IFXMIPS_GPIO_SANITY;
 118         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC)) | (1 << pin), IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC));
 119
 120         return 0;
 121 }
 122 EXPORT_SYMBOL(ifxmips_port_set_pudsel);
 123
 124 int
 125 ifxmips_port_clear_pudsel (unsigned int port, unsigned int pin)
 126 {
 127     IFXMIPS_GPIO_SANITY;
 128         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC)) & ~(1 << pin), IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC));
 129
 130         return 0;
 131 }
 132 EXPORT_SYMBOL(ifxmips_port_clear_pudsel);
 133
 134 int
 135 ifxmips_port_set_puden (unsigned int port, unsigned int pin)
 136 {
 137     IFXMIPS_GPIO_SANITY;
 138         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDEN + (port * 0xC)) | (1 << pin), IFXMIPS_GPIO_P0_PUDEN + (port * 0xC));
 139
 140         return 0;
 141 }
 142 EXPORT_SYMBOL(ifxmips_port_set_puden);
 143
 144 int
 145 ifxmips_port_clear_puden (unsigned int port, unsigned int pin)
 146 {
 147     IFXMIPS_GPIO_SANITY;
 148         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDEN + (port * 0xC)) & ~(1 << pin), IFXMIPS_GPIO_P0_PUDEN + (port * 0xC));
 149
 150         return 0;
 151 }
 152 EXPORT_SYMBOL(ifxmips_port_clear_puden);
 153
 154 int
 155 ifxmips_port_set_stoff (unsigned int port, unsigned int pin)
 156 {
 157     IFXMIPS_GPIO_SANITY;
 158         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_STOFF + (port * 0xC)) | (1 << pin), IFXMIPS_GPIO_P0_STOFF + (port * 0xC));
 159
 160         return 0;
 161 }
 162 EXPORT_SYMBOL(ifxmips_port_set_stoff);
 163
 164 int
 165 ifxmips_port_clear_stoff (unsigned int port, unsigned int pin)
 166 {
 167     IFXMIPS_GPIO_SANITY;
 168         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_STOFF + (port * 0xC)) & ~(1 << pin), IFXMIPS_GPIO_P0_STOFF + (port * 0xC));
 169
 170         return 0;
 171 }
 172 EXPORT_SYMBOL(ifxmips_port_clear_stoff);
 173
 174 int
 175 ifxmips_port_set_dir_out (unsigned int port, unsigned int pin)
 176 {
 177     IFXMIPS_GPIO_SANITY;
 178         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_DIR + (port * 0xC)) | (1 << pin), IFXMIPS_GPIO_P0_DIR + (port * 0xC));
 179
 180         return 0;
 181 }
 182 EXPORT_SYMBOL(ifxmips_port_set_dir_out);
 183
 184 int
 185 ifxmips_port_set_dir_in (unsigned int port, unsigned int pin)
 186 {
 187     IFXMIPS_GPIO_SANITY;
 188         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_DIR + (port * 0xC)) & ~(1 << pin), IFXMIPS_GPIO_P0_DIR + (port * 0xC));
 189
 190         return 0;
 191 }
 192 EXPORT_SYMBOL(ifxmips_port_set_dir_in);
 193
 194 int
 195 ifxmips_port_set_output (unsigned int port, unsigned int pin)
 196 {
 197     IFXMIPS_GPIO_SANITY;
 198         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OUT + (port * 0xC)) | (1 << pin), IFXMIPS_GPIO_P0_OUT + (port * 0xC));
 199
 200         return 0;
 201 }
 202 EXPORT_SYMBOL(ifxmips_port_set_output);
 203
 204 int
 205 ifxmips_port_clear_output (unsigned int port, unsigned int pin)
 206 {
 207     IFXMIPS_GPIO_SANITY;
 208         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OUT + (port * 0xC)) & ~(1 << pin), IFXMIPS_GPIO_P0_OUT + (port * 0xC));
 209
 210         return 0;
 211 }
 212 EXPORT_SYMBOL(ifxmips_port_clear_output);
 213
 214 int
 215 ifxmips_port_get_input (unsigned int port, unsigned int pin)
 216 {
 217     IFXMIPS_GPIO_SANITY;
 218
 219         if (ifxmips_r32(IFXMIPS_GPIO_P0_IN + (port * 0xC)) & (1 << pin))
 220                 return 0;
 221         else
 222                 return 1;
 223 }
 224 EXPORT_SYMBOL(ifxmips_port_get_input);
 225
 226 int
 227 ifxmips_port_set_altsel0 (unsigned int port, unsigned int pin)
 228 {
 229     IFXMIPS_GPIO_SANITY;
 230         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC)) | (1 << pin), IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC));
 231
 232         return 0;
 233 }
 234 EXPORT_SYMBOL(ifxmips_port_set_altsel0);
 235
 236 int
 237 ifxmips_port_clear_altsel0 (unsigned int port, unsigned int pin)
 238 {
 239     IFXMIPS_GPIO_SANITY;
 240         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC)) & ~(1 << pin), IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC));
 241
 242         return 0;
 243 }
 244 EXPORT_SYMBOL(ifxmips_port_clear_altsel0);
 245
 246 int
 247 ifxmips_port_set_altsel1 (unsigned int port, unsigned int pin)
 248 {
 249     IFXMIPS_GPIO_SANITY;
 250         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC)) | (1 << pin), IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC));
 251
 252         return 0;
 253 }
 254 EXPORT_SYMBOL(ifxmips_port_set_altsel1);
 255
 256 int
 257 ifxmips_port_clear_altsel1 (unsigned int port, unsigned int pin)
 258 {
 259     IFXMIPS_GPIO_SANITY;
 260         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC)) & ~(1 << pin), IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC));
 261
 262         return 0;
 263 }
 264 EXPORT_SYMBOL(ifxmips_port_clear_altsel1);
 265
 266 #ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
 267 static inline void add_msg(struct sk_buff *skb, char *msg)
 268 {
 269         char *scratch;
 270         scratch = skb_put(skb, strlen(msg) + 1);
 271         sprintf(scratch, msg);
 272 }
 273
 274 static void hotplug_button(struct work_struct *wq)
 275 {
 276         struct sk_buff *skb;
 277         struct event_t *event;
 278         size_t len;
 279         char *scratch, *s;
 280         char buf[128];
 281
 282         event = container_of(wq, struct event_t, wq);
 283         if (!uevent_sock)
 284                 goto done;
 285
 286         /* allocate message with the maximum possible size */
 287         s = event->set ? "pressed" : "released";
 288         len = strlen(s) + 2;
 289         skb = alloc_skb(len + 2048, GFP_KERNEL);
 290         if (!skb)
 291                 goto done;
 292
 293         /* add header */
 294         scratch = skb_put(skb, len);
 295         sprintf(scratch, "%s@",s);
 296
 297         /* copy keys to our continuous event payload buffer */
 298         add_msg(skb, "HOME=/");
 299         add_msg(skb, "PATH=/sbin:/bin:/usr/sbin:/usr/bin");
 300         add_msg(skb, "SUBSYSTEM=button");
 301         add_msg(skb, "BUTTON=reset");
 302         add_msg(skb, (event->set ? "ACTION=pressed" : "ACTION=released"));
 303         sprintf(buf, "SEEN=%ld", (event->jiffies - seen)/HZ);
 304         add_msg(skb, buf);
 305         snprintf(buf, 128, "SEQNUM=%llu", uevent_next_seqnum());
 306         add_msg(skb, buf);
 307
 308         NETLINK_CB(skb).dst_group = 1;
 309         netlink_broadcast(uevent_sock, skb, 0, 1, GFP_KERNEL);
 310
 311 done:
 312         kfree(event);
 313 }
 314
 315 static void reset_button_poll(unsigned long unused)
 316 {
 317         struct event_t *event;
 318
 319         rst_button_timer.expires = jiffies + HZ;
 320         add_timer(&rst_button_timer);
 321
 322         if (pressed != ifxmips_port_get_input(IFXMIPS_RST_PORT, IFXMIPS_RST_PIN))
 323         {
 324                 if(pressed)
 325                         pressed = 0;
 326                 else
 327                         pressed = 1;
 328                 printk("button was %s\n", (pressed ? "pressed" : "released"));
 329                 event = (struct event_t *) kzalloc(sizeof(struct event_t), GFP_ATOMIC);
 330                 if (!event)
 331                 {
 332                         printk("Could not alloc hotplug event\n");
 333                         return;
 334                 }
 335                 event->set = pressed;
 336                 event->jiffies = jiffies;
 337                 INIT_WORK(&event->wq, (void *)(void *)hotplug_button);
 338                 schedule_work(&event->wq);
 339                 seen = jiffies;
 340         }
 341 }
 342 #endif
 343
 344 long ifxmips_port_read_procmem_helper(char* tag, u32* in_reg, char *buf)
 345 {
 346         u32 reg, bit = 0;
 347         unsigned int len, t;
 348
 349         len = sprintf(buf, "\n%s: ", tag);
 350         reg = ifxmips_r32(in_reg);
 351         bit = 0x80000000;
 352         for (t = 0; t < 32; t++) {
 353                 if ((reg & bit) > 0)
 354                         len = len + sprintf(buf + len, "X");
 355                 else
 356                         len = len + sprintf(buf + len, " ");
 357                 bit = bit >> 1;
 358         }
 359
 360         return len;
 361 }
 362
 363 int
 364 ifxmips_port_read_procmem (char *buf, char **start, off_t offset, int count,
 365                           int *eof, void *data)
 366 {
 367         long len = sprintf (buf, "\nIFXMips Port Settings\n");
 368
 369         len += sprintf (buf + len,
 370                         "         3         2         1         0\n");
 371         len += sprintf (buf + len,
 372                         "        10987654321098765432109876543210\n");
 373         len += sprintf (buf + len,
 374                         "----------------------------------------\n");
 375
 376         len += ifxmips_port_read_procmem_helper("P0-OUT", IFXMIPS_GPIO_P0_OUT, &buf[len]);
 377         len += ifxmips_port_read_procmem_helper("P1-OUT", IFXMIPS_GPIO_P1_OUT, &buf[len]);
 378         len += ifxmips_port_read_procmem_helper("P0-IN ", IFXMIPS_GPIO_P0_IN, &buf[len]);
 379         len += ifxmips_port_read_procmem_helper("P1-IN ", IFXMIPS_GPIO_P1_IN, &buf[len]);
 380         len += ifxmips_port_read_procmem_helper("P0-DIR", IFXMIPS_GPIO_P0_DIR, &buf[len]);
 381         len += ifxmips_port_read_procmem_helper("P1-DIR", IFXMIPS_GPIO_P1_DIR, &buf[len]);
 382         len += ifxmips_port_read_procmem_helper("P0-STO ", IFXMIPS_GPIO_P0_STOFF, &buf[len]);
 383         len += ifxmips_port_read_procmem_helper("P1-STO ", IFXMIPS_GPIO_P1_STOFF, &buf[len]);
 384         len += ifxmips_port_read_procmem_helper("P0-PUDE", IFXMIPS_GPIO_P0_PUDEN, &buf[len]);
 385         len += ifxmips_port_read_procmem_helper("P1-PUDE", IFXMIPS_GPIO_P1_PUDEN, &buf[len]);
 386         len += ifxmips_port_read_procmem_helper("P0-OD  ", IFXMIPS_GPIO_P0_OD, &buf[len]);
 387         len += ifxmips_port_read_procmem_helper("P1-OD  ", IFXMIPS_GPIO_P1_OD, &buf[len]);
 388         len += ifxmips_port_read_procmem_helper("P0-PUDS", IFXMIPS_GPIO_P0_PUDSEL, &buf[len]);
 389         len += ifxmips_port_read_procmem_helper("P1-PUDS", IFXMIPS_GPIO_P1_PUDSEL, &buf[len]);
 390         len += ifxmips_port_read_procmem_helper("P0-ALT0", IFXMIPS_GPIO_P0_ALTSEL0, &buf[len]);
 391         len += ifxmips_port_read_procmem_helper("P1-ALT0", IFXMIPS_GPIO_P1_ALTSEL0, &buf[len]);
 392         len += ifxmips_port_read_procmem_helper("P0-ALT1", IFXMIPS_GPIO_P0_ALTSEL1, &buf[len]);
 393         len += ifxmips_port_read_procmem_helper("P1-ALT1", IFXMIPS_GPIO_P1_ALTSEL1, &buf[len]);
 394         len = len + sprintf (buf + len, "\n\n");
 395
 396         *eof = 1;
 397
 398         return len;
 399 }
 400
 401 static int
 402 ifxmips_port_open (struct inode *inode, struct file *filep)
 403 {
 404         return 0;
 405 }
 406
 407 static int
 408 ifxmips_port_release (struct inode *inode, struct file *filelp)
 409 {
 410         return 0;
 411 }
 412
 413 static int
 414 ifxmips_port_ioctl (struct inode *inode, struct file *filp,
 415                         unsigned int cmd, unsigned long arg)
 416 {
 417         int ret = 0;
 418         volatile struct ifxmips_port_ioctl_parm parm;
 419
 420         if (_IOC_TYPE (cmd) != IFXMIPS_PORT_IOC_MAGIC)
 421                 return -EINVAL;
 422
 423         if (_IOC_DIR (cmd) & _IOC_WRITE) {
 424                 if (!access_ok
 425                     (VERIFY_READ, arg,
 426                      sizeof (struct ifxmips_port_ioctl_parm)))
 427                         return -EFAULT;
 428                 ret = copy_from_user ((void *) &parm, (void *) arg,
 429                                       sizeof (struct ifxmips_port_ioctl_parm));
 430         }
 431         if (_IOC_DIR (cmd) & _IOC_READ) {
 432                 if (!access_ok
 433                     (VERIFY_WRITE, arg,
 434                      sizeof (struct ifxmips_port_ioctl_parm)))
 435                         return -EFAULT;
 436         }
 437
 438         if (down_trylock (&port_sem) != 0)
 439                 return -EBUSY;
 440
 441         switch (cmd) {
 442         case IFXMIPS_PORT_IOCOD:
 443                 if (parm.value == 0x00)
 444                         ifxmips_port_clear_open_drain(parm.port, parm.pin);
 445                 else
 446                         ifxmips_port_set_open_drain(parm.port, parm.pin);
 447                 break;
 448
 449         case IFXMIPS_PORT_IOCPUDSEL:
 450                 if (parm.value == 0x00)
 451                         ifxmips_port_clear_pudsel(parm.port, parm.pin);
 452                 else
 453                         ifxmips_port_set_pudsel(parm.port, parm.pin);
 454                 break;
 455
 456         case IFXMIPS_PORT_IOCPUDEN:
 457                 if (parm.value == 0x00)
 458                         ifxmips_port_clear_puden(parm.port, parm.pin);
 459                 else
 460                         ifxmips_port_set_puden(parm.port, parm.pin);
 461                 break;
 462
 463         case IFXMIPS_PORT_IOCSTOFF:
 464                 if (parm.value == 0x00)
 465                         ifxmips_port_clear_stoff(parm.port, parm.pin);
 466                 else
 467                         ifxmips_port_set_stoff(parm.port, parm.pin);
 468                 break;
 469
 470         case IFXMIPS_PORT_IOCDIR:
 471                 if (parm.value == 0x00)
 472                         ifxmips_port_set_dir_in(parm.port, parm.pin);
 473                 else
 474                         ifxmips_port_set_dir_out(parm.port, parm.pin);
 475                 break;
 476
 477         case IFXMIPS_PORT_IOCOUTPUT:
 478                 if (parm.value == 0x00)
 479                         ifxmips_port_clear_output(parm.port, parm.pin);
 480                 else
 481                         ifxmips_port_set_output(parm.port, parm.pin);
 482                 break;
 483
 484         case IFXMIPS_PORT_IOCALTSEL0:
 485                 if (parm.value == 0x00)
 486                         ifxmips_port_clear_altsel0(parm.port, parm.pin);
 487                 else
 488                         ifxmips_port_set_altsel0(parm.port, parm.pin);
 489                 break;
 490
 491         case IFXMIPS_PORT_IOCALTSEL1:
 492                 if (parm.value == 0x00)
 493                         ifxmips_port_clear_altsel1(parm.port, parm.pin);
 494                 else
 495                         ifxmips_port_set_altsel1(parm.port, parm.pin);
 496                 break;
 497
 498         case IFXMIPS_PORT_IOCINPUT:
 499                 parm.value = ifxmips_port_get_input(parm.port, parm.pin);
 500                 copy_to_user((void*)arg, (void*)&parm,
 501                         sizeof(struct ifxmips_port_ioctl_parm));
 502                 break;
 503
 504         default:
 505                 ret = -EINVAL;
 506         }
 507
 508         up (&port_sem);
 509
 510         return ret;
 511 }
 512
 513 static struct file_operations port_fops = {
 514       .open = ifxmips_port_open,
 515       .release = ifxmips_port_release,
 516       .ioctl = ifxmips_port_ioctl
 517 };
 518
 519 static int
 520 ifxmips_gpio_probe (struct platform_device *dev)
 521 {
 522         int retval = 0;
 523
 524         sema_init (&port_sem, 1);
 525
 526         ifxmips_gpio_major = register_chrdev(0, DRVNAME, &port_fops);
 527         if (!ifxmips_gpio_major)
 528         {
 529                 printk(KERN_INFO DRVNAME ": Error! Could not register port device. #%d\n", ifxmips_gpio_major);
 530                 retval = -EINVAL;
 531                 goto out;
 532         }
 533
 534         create_proc_read_entry(DRVNAME, 0, NULL, ifxmips_port_read_procmem, NULL);
 535
 536 #ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
 537         ifxmips_port_set_open_drain(IFXMIPS_RST_PORT, IFXMIPS_RST_PIN);
 538         ifxmips_port_clear_altsel0(IFXMIPS_RST_PORT, IFXMIPS_RST_PIN);
 539         ifxmips_port_clear_altsel1(IFXMIPS_RST_PORT, IFXMIPS_RST_PIN);
 540         ifxmips_port_set_dir_in(IFXMIPS_RST_PORT, IFXMIPS_RST_PIN);
 541
 542         seen = jiffies;
 543
 544         init_timer(&rst_button_timer);
 545         rst_button_timer.function = reset_button_poll;
 546         rst_button_timer.expires = jiffies + HZ;
 547         add_timer(&rst_button_timer);
 548 #endif
 549
 550         printk(KERN_INFO DRVNAME ": device successfully initialized #%d.\n", ifxmips_gpio_major);
 551
 552 out:
 553         return retval;
 554 }
 555
 556 static int
 557 ifxmips_gpio_remove (struct platform_device *pdev)
 558 {
 559 #ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
 560         del_timer_sync(&rst_button_timer);
 561 #endif
 562         unregister_chrdev(ifxmips_gpio_major, DRVNAME);
 563         remove_proc_entry(DRVNAME, NULL);
 564
 565         return 0;
 566 }
 567
 568 static struct
 569 platform_driver ifxmips_gpio_driver = {
 570         .probe = ifxmips_gpio_probe,
 571         .remove = ifxmips_gpio_remove,
 572         .driver = {
 573                 .name = DRVNAME,
 574                 .owner = THIS_MODULE,
 575         },
 576 };
 577
 578 int __init
 579 ifxmips_gpio_init (void)
 580 {
 581         int ret = platform_driver_register(&ifxmips_gpio_driver);
 582         if (ret)
 583                 printk(KERN_INFO DRVNAME ": Error registering platfom driver!");
 584         return ret;
 585 }
 586
 587 void __exit
 588 ifxmips_gpio_exit (void)
 589 {
 590         platform_driver_unregister(&ifxmips_gpio_driver);
 591 }
 592
 593 module_init(ifxmips_gpio_init);
 594 module_exit(ifxmips_gpio_exit);