Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * HIL MLC state machine and serio interface driver |
| 3 | * |
| 4 | * Copyright (c) 2001 Brian S. Julin |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * 1. Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions, and the following disclaimer, |
| 12 | * without modification. |
| 13 | * 2. The name of the author may not be used to endorse or promote products |
| 14 | * derived from this software without specific prior written permission. |
| 15 | * |
| 16 | * Alternatively, this software may be distributed under the terms of the |
| 17 | * GNU General Public License ("GPL"). |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR |
| 23 | * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 28 | * |
| 29 | * References: |
| 30 | * HP-HIL Technical Reference Manual. Hewlett Packard Product No. 45918A |
| 31 | * |
| 32 | * |
| 33 | * Driver theory of operation: |
| 34 | * |
| 35 | * Some access methods and an ISR is defined by the sub-driver |
| 36 | * (e.g. hp_sdc_mlc.c). These methods are expected to provide a |
| 37 | * few bits of logic in addition to raw access to the HIL MLC, |
| 38 | * specifically, the ISR, which is entirely registered by the |
| 39 | * sub-driver and invoked directly, must check for record |
| 40 | * termination or packet match, at which point a semaphore must |
| 41 | * be cleared and then the hil_mlcs_tasklet must be scheduled. |
| 42 | * |
| 43 | * The hil_mlcs_tasklet processes the state machine for all MLCs |
| 44 | * each time it runs, checking each MLC's progress at the current |
| 45 | * node in the state machine, and moving the MLC to subsequent nodes |
| 46 | * in the state machine when appropriate. It will reschedule |
| 47 | * itself if output is pending. (This rescheduling should be replaced |
| 48 | * at some point with a sub-driver-specific mechanism.) |
| 49 | * |
| 50 | * A timer task prods the tasklet once per second to prevent |
| 51 | * hangups when attached devices do not return expected data |
| 52 | * and to initiate probes of the loop for new devices. |
| 53 | */ |
| 54 | |
| 55 | #include <linux/hil_mlc.h> |
| 56 | #include <linux/errno.h> |
| 57 | #include <linux/kernel.h> |
| 58 | #include <linux/module.h> |
| 59 | #include <linux/init.h> |
| 60 | #include <linux/interrupt.h> |
| 61 | #include <linux/timer.h> |
| 62 | #include <linux/sched.h> |
| 63 | #include <linux/list.h> |
| 64 | |
| 65 | MODULE_AUTHOR("Brian S. Julin <bri@calyx.com>"); |
| 66 | MODULE_DESCRIPTION("HIL MLC serio"); |
| 67 | MODULE_LICENSE("Dual BSD/GPL"); |
| 68 | |
| 69 | EXPORT_SYMBOL(hil_mlc_register); |
| 70 | EXPORT_SYMBOL(hil_mlc_unregister); |
| 71 | |
| 72 | #define PREFIX "HIL MLC: " |
| 73 | |
| 74 | static LIST_HEAD(hil_mlcs); |
| 75 | static DEFINE_RWLOCK(hil_mlcs_lock); |
| 76 | static struct timer_list hil_mlcs_kicker; |
| 77 | static int hil_mlcs_probe; |
| 78 | |
| 79 | static void hil_mlcs_process(unsigned long unused); |
| 80 | DECLARE_TASKLET_DISABLED(hil_mlcs_tasklet, hil_mlcs_process, 0); |
| 81 | |
| 82 | |
| 83 | /* #define HIL_MLC_DEBUG */ |
| 84 | |
| 85 | /********************** Device info/instance management **********************/ |
| 86 | |
| 87 | static void hil_mlc_clear_di_map (hil_mlc *mlc, int val) { |
| 88 | int j; |
| 89 | for (j = val; j < 7 ; j++) { |
| 90 | mlc->di_map[j] = -1; |
| 91 | } |
| 92 | } |
| 93 | |
| 94 | static void hil_mlc_clear_di_scratch (hil_mlc *mlc) { |
| 95 | memset(&(mlc->di_scratch), 0, sizeof(mlc->di_scratch)); |
| 96 | } |
| 97 | |
| 98 | static void hil_mlc_copy_di_scratch (hil_mlc *mlc, int idx) { |
| 99 | memcpy(&(mlc->di[idx]), &(mlc->di_scratch), sizeof(mlc->di_scratch)); |
| 100 | } |
| 101 | |
| 102 | static int hil_mlc_match_di_scratch (hil_mlc *mlc) { |
| 103 | int idx; |
| 104 | |
| 105 | for (idx = 0; idx < HIL_MLC_DEVMEM; idx++) { |
| 106 | int j, found; |
| 107 | |
| 108 | /* In-use slots are not eligible. */ |
| 109 | found = 0; |
| 110 | for (j = 0; j < 7 ; j++) { |
| 111 | if (mlc->di_map[j] == idx) found++; |
| 112 | } |
| 113 | if (found) continue; |
| 114 | if (!memcmp(mlc->di + idx, |
| 115 | &(mlc->di_scratch), |
| 116 | sizeof(mlc->di_scratch))) break; |
| 117 | } |
| 118 | return((idx >= HIL_MLC_DEVMEM) ? -1 : idx); |
| 119 | } |
| 120 | |
| 121 | static int hil_mlc_find_free_di(hil_mlc *mlc) { |
| 122 | int idx; |
| 123 | /* TODO: Pick all-zero slots first, failing that, |
| 124 | * randomize the slot picked among those eligible. |
| 125 | */ |
| 126 | for (idx = 0; idx < HIL_MLC_DEVMEM; idx++) { |
| 127 | int j, found; |
| 128 | found = 0; |
| 129 | for (j = 0; j < 7 ; j++) { |
| 130 | if (mlc->di_map[j] == idx) found++; |
| 131 | } |
| 132 | if (!found) break; |
| 133 | } |
| 134 | return(idx); /* Note: It is guaranteed at least one above will match */ |
| 135 | } |
| 136 | |
| 137 | static inline void hil_mlc_clean_serio_map(hil_mlc *mlc) { |
| 138 | int idx; |
| 139 | for (idx = 0; idx < HIL_MLC_DEVMEM; idx++) { |
| 140 | int j, found; |
| 141 | found = 0; |
| 142 | for (j = 0; j < 7 ; j++) { |
| 143 | if (mlc->di_map[j] == idx) found++; |
| 144 | } |
| 145 | if (!found) mlc->serio_map[idx].di_revmap = -1; |
| 146 | } |
| 147 | } |
| 148 | |
| 149 | static void hil_mlc_send_polls(hil_mlc *mlc) { |
| 150 | int did, i, cnt; |
| 151 | struct serio *serio; |
| 152 | struct serio_driver *drv; |
| 153 | |
| 154 | i = cnt = 0; |
| 155 | did = (mlc->ipacket[0] & HIL_PKT_ADDR_MASK) >> 8; |
| 156 | serio = did ? mlc->serio[mlc->di_map[did - 1]] : NULL; |
| 157 | drv = (serio != NULL) ? serio->drv : NULL; |
| 158 | |
| 159 | while (mlc->icount < 15 - i) { |
| 160 | hil_packet p; |
| 161 | p = mlc->ipacket[i]; |
| 162 | if (did != (p & HIL_PKT_ADDR_MASK) >> 8) { |
| 163 | if (drv == NULL || drv->interrupt == NULL) goto skip; |
| 164 | |
| 165 | drv->interrupt(serio, 0, 0, NULL); |
| 166 | drv->interrupt(serio, HIL_ERR_INT >> 16, 0, NULL); |
| 167 | drv->interrupt(serio, HIL_PKT_CMD >> 8, 0, NULL); |
| 168 | drv->interrupt(serio, HIL_CMD_POL + cnt, 0, NULL); |
| 169 | skip: |
| 170 | did = (p & HIL_PKT_ADDR_MASK) >> 8; |
| 171 | serio = did ? mlc->serio[mlc->di_map[did-1]] : NULL; |
| 172 | drv = (serio != NULL) ? serio->drv : NULL; |
| 173 | cnt = 0; |
| 174 | } |
| 175 | cnt++; i++; |
| 176 | if (drv == NULL || drv->interrupt == NULL) continue; |
| 177 | drv->interrupt(serio, (p >> 24), 0, NULL); |
| 178 | drv->interrupt(serio, (p >> 16) & 0xff, 0, NULL); |
| 179 | drv->interrupt(serio, (p >> 8) & ~HIL_PKT_ADDR_MASK, 0, NULL); |
| 180 | drv->interrupt(serio, p & 0xff, 0, NULL); |
| 181 | } |
| 182 | } |
| 183 | |
| 184 | /*************************** State engine *********************************/ |
| 185 | |
| 186 | #define HILSEN_SCHED 0x000100 /* Schedule the tasklet */ |
| 187 | #define HILSEN_BREAK 0x000200 /* Wait until next pass */ |
| 188 | #define HILSEN_UP 0x000400 /* relative node#, decrement */ |
| 189 | #define HILSEN_DOWN 0x000800 /* relative node#, increment */ |
| 190 | #define HILSEN_FOLLOW 0x001000 /* use retval as next node# */ |
| 191 | |
| 192 | #define HILSEN_MASK 0x0000ff |
| 193 | #define HILSEN_START 0 |
| 194 | #define HILSEN_RESTART 1 |
| 195 | #define HILSEN_DHR 9 |
| 196 | #define HILSEN_DHR2 10 |
| 197 | #define HILSEN_IFC 14 |
| 198 | #define HILSEN_HEAL0 16 |
| 199 | #define HILSEN_HEAL 18 |
| 200 | #define HILSEN_ACF 21 |
| 201 | #define HILSEN_ACF2 22 |
| 202 | #define HILSEN_DISC0 25 |
| 203 | #define HILSEN_DISC 27 |
| 204 | #define HILSEN_MATCH 40 |
| 205 | #define HILSEN_OPERATE 41 |
| 206 | #define HILSEN_PROBE 44 |
| 207 | #define HILSEN_DSR 52 |
| 208 | #define HILSEN_REPOLL 55 |
| 209 | #define HILSEN_IFCACF 58 |
| 210 | #define HILSEN_END 60 |
| 211 | |
| 212 | #define HILSEN_NEXT (HILSEN_DOWN | 1) |
| 213 | #define HILSEN_SAME (HILSEN_DOWN | 0) |
| 214 | #define HILSEN_LAST (HILSEN_UP | 1) |
| 215 | |
| 216 | #define HILSEN_DOZE (HILSEN_SAME | HILSEN_SCHED | HILSEN_BREAK) |
| 217 | #define HILSEN_SLEEP (HILSEN_SAME | HILSEN_BREAK) |
| 218 | |
| 219 | static int hilse_match(hil_mlc *mlc, int unused) { |
| 220 | int rc; |
| 221 | rc = hil_mlc_match_di_scratch(mlc); |
| 222 | if (rc == -1) { |
| 223 | rc = hil_mlc_find_free_di(mlc); |
| 224 | if (rc == -1) goto err; |
| 225 | #ifdef HIL_MLC_DEBUG |
| 226 | printk(KERN_DEBUG PREFIX "new in slot %i\n", rc); |
| 227 | #endif |
| 228 | hil_mlc_copy_di_scratch(mlc, rc); |
| 229 | mlc->di_map[mlc->ddi] = rc; |
| 230 | mlc->serio_map[rc].di_revmap = mlc->ddi; |
| 231 | hil_mlc_clean_serio_map(mlc); |
| 232 | serio_rescan(mlc->serio[rc]); |
| 233 | return -1; |
| 234 | } |
| 235 | mlc->di_map[mlc->ddi] = rc; |
| 236 | #ifdef HIL_MLC_DEBUG |
| 237 | printk(KERN_DEBUG PREFIX "same in slot %i\n", rc); |
| 238 | #endif |
| 239 | mlc->serio_map[rc].di_revmap = mlc->ddi; |
| 240 | hil_mlc_clean_serio_map(mlc); |
| 241 | return 0; |
| 242 | err: |
| 243 | printk(KERN_ERR PREFIX "Residual device slots exhausted, close some serios!\n"); |
| 244 | return 1; |
| 245 | } |
| 246 | |
| 247 | /* An LCV used to prevent runaway loops, forces 5 second sleep when reset. */ |
| 248 | static int hilse_init_lcv(hil_mlc *mlc, int unused) { |
| 249 | struct timeval tv; |
| 250 | |
| 251 | do_gettimeofday(&tv); |
| 252 | |
| 253 | if(mlc->lcv == 0) goto restart; /* First init, no need to dally */ |
| 254 | if(tv.tv_sec - mlc->lcv_tv.tv_sec < 5) return -1; |
| 255 | restart: |
| 256 | mlc->lcv_tv = tv; |
| 257 | mlc->lcv = 0; |
| 258 | return 0; |
| 259 | } |
| 260 | |
| 261 | static int hilse_inc_lcv(hil_mlc *mlc, int lim) { |
| 262 | if (mlc->lcv++ >= lim) return -1; |
| 263 | return 0; |
| 264 | } |
| 265 | |
| 266 | #if 0 |
| 267 | static int hilse_set_lcv(hil_mlc *mlc, int val) { |
| 268 | mlc->lcv = val; |
| 269 | return 0; |
| 270 | } |
| 271 | #endif |
| 272 | |
| 273 | /* Management of the discovered device index (zero based, -1 means no devs) */ |
| 274 | static int hilse_set_ddi(hil_mlc *mlc, int val) { |
| 275 | mlc->ddi = val; |
| 276 | hil_mlc_clear_di_map(mlc, val + 1); |
| 277 | return 0; |
| 278 | } |
| 279 | |
| 280 | static int hilse_dec_ddi(hil_mlc *mlc, int unused) { |
| 281 | mlc->ddi--; |
| 282 | if (mlc->ddi <= -1) { |
| 283 | mlc->ddi = -1; |
| 284 | hil_mlc_clear_di_map(mlc, 0); |
| 285 | return -1; |
| 286 | } |
| 287 | hil_mlc_clear_di_map(mlc, mlc->ddi + 1); |
| 288 | return 0; |
| 289 | } |
| 290 | |
| 291 | static int hilse_inc_ddi(hil_mlc *mlc, int unused) { |
| 292 | if (mlc->ddi >= 6) { |
| 293 | BUG(); |
| 294 | return -1; |
| 295 | } |
| 296 | mlc->ddi++; |
| 297 | return 0; |
| 298 | } |
| 299 | |
| 300 | static int hilse_take_idd(hil_mlc *mlc, int unused) { |
| 301 | int i; |
| 302 | |
| 303 | /* Help the state engine: |
| 304 | * Is this a real IDD response or just an echo? |
| 305 | * |
| 306 | * Real IDD response does not start with a command. |
| 307 | */ |
| 308 | if (mlc->ipacket[0] & HIL_PKT_CMD) goto bail; |
| 309 | /* Should have the command echoed further down. */ |
| 310 | for (i = 1; i < 16; i++) { |
| 311 | if (((mlc->ipacket[i] & HIL_PKT_ADDR_MASK) == |
| 312 | (mlc->ipacket[0] & HIL_PKT_ADDR_MASK)) && |
| 313 | (mlc->ipacket[i] & HIL_PKT_CMD) && |
| 314 | ((mlc->ipacket[i] & HIL_PKT_DATA_MASK) == HIL_CMD_IDD)) |
| 315 | break; |
| 316 | } |
| 317 | if (i > 15) goto bail; |
| 318 | /* And the rest of the packets should still be clear. */ |
| 319 | while (++i < 16) { |
| 320 | if (mlc->ipacket[i]) break; |
| 321 | } |
| 322 | if (i < 16) goto bail; |
| 323 | for (i = 0; i < 16; i++) { |
| 324 | mlc->di_scratch.idd[i] = |
| 325 | mlc->ipacket[i] & HIL_PKT_DATA_MASK; |
| 326 | } |
| 327 | /* Next step is to see if RSC supported */ |
| 328 | if (mlc->di_scratch.idd[1] & HIL_IDD_HEADER_RSC) |
| 329 | return HILSEN_NEXT; |
| 330 | if (mlc->di_scratch.idd[1] & HIL_IDD_HEADER_EXD) |
| 331 | return HILSEN_DOWN | 4; |
| 332 | return 0; |
| 333 | bail: |
| 334 | mlc->ddi--; |
| 335 | return -1; /* This should send us off to ACF */ |
| 336 | } |
| 337 | |
| 338 | static int hilse_take_rsc(hil_mlc *mlc, int unused) { |
| 339 | int i; |
| 340 | |
| 341 | for (i = 0; i < 16; i++) { |
| 342 | mlc->di_scratch.rsc[i] = |
| 343 | mlc->ipacket[i] & HIL_PKT_DATA_MASK; |
| 344 | } |
| 345 | /* Next step is to see if EXD supported (IDD has already been read) */ |
| 346 | if (mlc->di_scratch.idd[1] & HIL_IDD_HEADER_EXD) |
| 347 | return HILSEN_NEXT; |
| 348 | return 0; |
| 349 | } |
| 350 | |
| 351 | static int hilse_take_exd(hil_mlc *mlc, int unused) { |
| 352 | int i; |
| 353 | |
| 354 | for (i = 0; i < 16; i++) { |
| 355 | mlc->di_scratch.exd[i] = |
| 356 | mlc->ipacket[i] & HIL_PKT_DATA_MASK; |
| 357 | } |
| 358 | /* Next step is to see if RNM supported. */ |
| 359 | if (mlc->di_scratch.exd[0] & HIL_EXD_HEADER_RNM) |
| 360 | return HILSEN_NEXT; |
| 361 | return 0; |
| 362 | } |
| 363 | |
| 364 | static int hilse_take_rnm(hil_mlc *mlc, int unused) { |
| 365 | int i; |
| 366 | |
| 367 | for (i = 0; i < 16; i++) { |
| 368 | mlc->di_scratch.rnm[i] = |
| 369 | mlc->ipacket[i] & HIL_PKT_DATA_MASK; |
| 370 | } |
| 371 | do { |
| 372 | char nam[17]; |
| 373 | snprintf(nam, 16, "%s", mlc->di_scratch.rnm); |
| 374 | nam[16] = '\0'; |
| 375 | printk(KERN_INFO PREFIX "Device name gotten: %s\n", nam); |
| 376 | } while (0); |
| 377 | return 0; |
| 378 | } |
| 379 | |
| 380 | static int hilse_operate(hil_mlc *mlc, int repoll) { |
| 381 | |
| 382 | if (mlc->opercnt == 0) hil_mlcs_probe = 0; |
| 383 | mlc->opercnt = 1; |
| 384 | |
| 385 | hil_mlc_send_polls(mlc); |
| 386 | |
| 387 | if (!hil_mlcs_probe) return 0; |
| 388 | hil_mlcs_probe = 0; |
| 389 | mlc->opercnt = 0; |
| 390 | return 1; |
| 391 | } |
| 392 | |
| 393 | #define FUNC(funct, funct_arg, zero_rc, neg_rc, pos_rc) \ |
| 394 | { HILSE_FUNC, { func: &funct }, funct_arg, zero_rc, neg_rc, pos_rc }, |
| 395 | #define OUT(pack) \ |
| 396 | { HILSE_OUT, { packet: pack }, 0, HILSEN_NEXT, HILSEN_DOZE, 0 }, |
| 397 | #define CTS \ |
| 398 | { HILSE_CTS, { packet: 0 }, 0, HILSEN_NEXT | HILSEN_SCHED | HILSEN_BREAK, HILSEN_DOZE, 0 }, |
| 399 | #define EXPECT(comp, to, got, got_wrong, timed_out) \ |
| 400 | { HILSE_EXPECT, { packet: comp }, to, got, got_wrong, timed_out }, |
| 401 | #define EXPECT_LAST(comp, to, got, got_wrong, timed_out) \ |
| 402 | { HILSE_EXPECT_LAST, { packet: comp }, to, got, got_wrong, timed_out }, |
| 403 | #define EXPECT_DISC(comp, to, got, got_wrong, timed_out) \ |
| 404 | { HILSE_EXPECT_DISC, { packet: comp }, to, got, got_wrong, timed_out }, |
| 405 | #define IN(to, got, got_error, timed_out) \ |
| 406 | { HILSE_IN, { packet: 0 }, to, got, got_error, timed_out }, |
| 407 | #define OUT_DISC(pack) \ |
| 408 | { HILSE_OUT_DISC, { packet: pack }, 0, 0, 0, 0 }, |
| 409 | #define OUT_LAST(pack) \ |
| 410 | { HILSE_OUT_LAST, { packet: pack }, 0, 0, 0, 0 }, |
| 411 | |
| 412 | struct hilse_node hil_mlc_se[HILSEN_END] = { |
| 413 | |
| 414 | /* 0 HILSEN_START */ |
| 415 | FUNC(hilse_init_lcv, 0, HILSEN_NEXT, HILSEN_SLEEP, 0) |
| 416 | |
| 417 | /* 1 HILSEN_RESTART */ |
| 418 | FUNC(hilse_inc_lcv, 10, HILSEN_NEXT, HILSEN_START, 0) |
| 419 | OUT(HIL_CTRL_ONLY) /* Disable APE */ |
| 420 | CTS |
| 421 | |
| 422 | #define TEST_PACKET(x) \ |
| 423 | (HIL_PKT_CMD | (x << HIL_PKT_ADDR_SHIFT) | x << 4 | x) |
| 424 | |
| 425 | OUT(HIL_DO_ALTER_CTRL | HIL_CTRL_TEST | TEST_PACKET(0x5)) |
| 426 | EXPECT(HIL_ERR_INT | TEST_PACKET(0x5), |
| 427 | 2000, HILSEN_NEXT, HILSEN_RESTART, HILSEN_RESTART) |
| 428 | OUT(HIL_DO_ALTER_CTRL | HIL_CTRL_TEST | TEST_PACKET(0xa)) |
| 429 | EXPECT(HIL_ERR_INT | TEST_PACKET(0xa), |
| 430 | 2000, HILSEN_NEXT, HILSEN_RESTART, HILSEN_RESTART) |
| 431 | OUT(HIL_CTRL_ONLY | 0) /* Disable test mode */ |
| 432 | |
| 433 | /* 9 HILSEN_DHR */ |
| 434 | FUNC(hilse_init_lcv, 0, HILSEN_NEXT, HILSEN_SLEEP, 0) |
| 435 | |
| 436 | /* 10 HILSEN_DHR2 */ |
| 437 | FUNC(hilse_inc_lcv, 10, HILSEN_NEXT, HILSEN_START, 0) |
| 438 | FUNC(hilse_set_ddi, -1, HILSEN_NEXT, 0, 0) |
| 439 | OUT(HIL_PKT_CMD | HIL_CMD_DHR) |
| 440 | IN(300000, HILSEN_DHR2, HILSEN_DHR2, HILSEN_NEXT) |
| 441 | |
| 442 | /* 14 HILSEN_IFC */ |
| 443 | OUT(HIL_PKT_CMD | HIL_CMD_IFC) |
| 444 | EXPECT(HIL_PKT_CMD | HIL_CMD_IFC | HIL_ERR_INT, |
| 445 | 20000, HILSEN_DISC, HILSEN_DHR2, HILSEN_NEXT ) |
| 446 | |
| 447 | /* If devices are there, they weren't in PUP or other loopback mode. |
| 448 | * We're more concerned at this point with restoring operation |
| 449 | * to devices than discovering new ones, so we try to salvage |
| 450 | * the loop configuration by closing off the loop. |
| 451 | */ |
| 452 | |
| 453 | /* 16 HILSEN_HEAL0 */ |
| 454 | FUNC(hilse_dec_ddi, 0, HILSEN_NEXT, HILSEN_ACF, 0) |
| 455 | FUNC(hilse_inc_ddi, 0, HILSEN_NEXT, 0, 0) |
| 456 | |
| 457 | /* 18 HILSEN_HEAL */ |
| 458 | OUT_LAST(HIL_CMD_ELB) |
| 459 | EXPECT_LAST(HIL_CMD_ELB | HIL_ERR_INT, |
| 460 | 20000, HILSEN_REPOLL, HILSEN_DSR, HILSEN_NEXT) |
| 461 | FUNC(hilse_dec_ddi, 0, HILSEN_HEAL, HILSEN_NEXT, 0) |
| 462 | |
| 463 | /* 21 HILSEN_ACF */ |
| 464 | FUNC(hilse_init_lcv, 0, HILSEN_NEXT, HILSEN_DOZE, 0) |
| 465 | |
| 466 | /* 22 HILSEN_ACF2 */ |
| 467 | FUNC(hilse_inc_lcv, 10, HILSEN_NEXT, HILSEN_START, 0) |
| 468 | OUT(HIL_PKT_CMD | HIL_CMD_ACF | 1) |
| 469 | IN(20000, HILSEN_NEXT, HILSEN_DSR, HILSEN_NEXT) |
| 470 | |
| 471 | /* 25 HILSEN_DISC0 */ |
| 472 | OUT_DISC(HIL_PKT_CMD | HIL_CMD_ELB) |
| 473 | EXPECT_DISC(HIL_PKT_CMD | HIL_CMD_ELB | HIL_ERR_INT, |
| 474 | 20000, HILSEN_NEXT, HILSEN_DSR, HILSEN_DSR) |
| 475 | |
| 476 | /* Only enter here if response just received */ |
| 477 | /* 27 HILSEN_DISC */ |
| 478 | OUT_DISC(HIL_PKT_CMD | HIL_CMD_IDD) |
| 479 | EXPECT_DISC(HIL_PKT_CMD | HIL_CMD_IDD | HIL_ERR_INT, |
| 480 | 20000, HILSEN_NEXT, HILSEN_DSR, HILSEN_START) |
| 481 | FUNC(hilse_inc_ddi, 0, HILSEN_NEXT, HILSEN_START, 0) |
| 482 | FUNC(hilse_take_idd, 0, HILSEN_MATCH, HILSEN_IFCACF, HILSEN_FOLLOW) |
| 483 | OUT_LAST(HIL_PKT_CMD | HIL_CMD_RSC) |
| 484 | EXPECT_LAST(HIL_PKT_CMD | HIL_CMD_RSC | HIL_ERR_INT, |
| 485 | 30000, HILSEN_NEXT, HILSEN_DSR, HILSEN_DSR) |
| 486 | FUNC(hilse_take_rsc, 0, HILSEN_MATCH, 0, HILSEN_FOLLOW) |
| 487 | OUT_LAST(HIL_PKT_CMD | HIL_CMD_EXD) |
| 488 | EXPECT_LAST(HIL_PKT_CMD | HIL_CMD_EXD | HIL_ERR_INT, |
| 489 | 30000, HILSEN_NEXT, HILSEN_DSR, HILSEN_DSR) |
| 490 | FUNC(hilse_take_exd, 0, HILSEN_MATCH, 0, HILSEN_FOLLOW) |
| 491 | OUT_LAST(HIL_PKT_CMD | HIL_CMD_RNM) |
| 492 | EXPECT_LAST(HIL_PKT_CMD | HIL_CMD_RNM | HIL_ERR_INT, |
| 493 | 30000, HILSEN_NEXT, HILSEN_DSR, HILSEN_DSR) |
| 494 | FUNC(hilse_take_rnm, 0, HILSEN_MATCH, 0, 0) |
| 495 | |
| 496 | /* 40 HILSEN_MATCH */ |
| 497 | FUNC(hilse_match, 0, HILSEN_NEXT, HILSEN_NEXT, /* TODO */ 0) |
| 498 | |
| 499 | /* 41 HILSEN_OPERATE */ |
| 500 | OUT(HIL_PKT_CMD | HIL_CMD_POL) |
| 501 | EXPECT(HIL_PKT_CMD | HIL_CMD_POL | HIL_ERR_INT, |
| 502 | 20000, HILSEN_NEXT, HILSEN_DSR, HILSEN_NEXT) |
| 503 | FUNC(hilse_operate, 0, HILSEN_OPERATE, HILSEN_IFC, HILSEN_NEXT) |
| 504 | |
| 505 | /* 44 HILSEN_PROBE */ |
| 506 | OUT_LAST(HIL_PKT_CMD | HIL_CMD_EPT) |
| 507 | IN(10000, HILSEN_DISC, HILSEN_DSR, HILSEN_NEXT) |
| 508 | OUT_DISC(HIL_PKT_CMD | HIL_CMD_ELB) |
| 509 | IN(10000, HILSEN_DISC, HILSEN_DSR, HILSEN_NEXT) |
| 510 | OUT(HIL_PKT_CMD | HIL_CMD_ACF | 1) |
| 511 | IN(10000, HILSEN_DISC0, HILSEN_DSR, HILSEN_NEXT) |
| 512 | OUT_LAST(HIL_PKT_CMD | HIL_CMD_ELB) |
| 513 | IN(10000, HILSEN_OPERATE, HILSEN_DSR, HILSEN_DSR) |
| 514 | |
| 515 | /* 52 HILSEN_DSR */ |
| 516 | FUNC(hilse_set_ddi, -1, HILSEN_NEXT, 0, 0) |
| 517 | OUT(HIL_PKT_CMD | HIL_CMD_DSR) |
| 518 | IN(20000, HILSEN_DHR, HILSEN_DHR, HILSEN_IFC) |
| 519 | |
| 520 | /* 55 HILSEN_REPOLL */ |
| 521 | OUT(HIL_PKT_CMD | HIL_CMD_RPL) |
| 522 | EXPECT(HIL_PKT_CMD | HIL_CMD_RPL | HIL_ERR_INT, |
| 523 | 20000, HILSEN_NEXT, HILSEN_DSR, HILSEN_NEXT) |
| 524 | FUNC(hilse_operate, 1, HILSEN_OPERATE, HILSEN_IFC, HILSEN_PROBE) |
| 525 | |
| 526 | /* 58 HILSEN_IFCACF */ |
| 527 | OUT(HIL_PKT_CMD | HIL_CMD_IFC) |
| 528 | EXPECT(HIL_PKT_CMD | HIL_CMD_IFC | HIL_ERR_INT, |
| 529 | 20000, HILSEN_ACF2, HILSEN_DHR2, HILSEN_HEAL) |
| 530 | |
| 531 | /* 60 HILSEN_END */ |
| 532 | }; |
| 533 | |
| 534 | static inline void hilse_setup_input(hil_mlc *mlc, struct hilse_node *node) { |
| 535 | |
| 536 | switch (node->act) { |
| 537 | case HILSE_EXPECT_DISC: |
| 538 | mlc->imatch = node->object.packet; |
| 539 | mlc->imatch |= ((mlc->ddi + 2) << HIL_PKT_ADDR_SHIFT); |
| 540 | break; |
| 541 | case HILSE_EXPECT_LAST: |
| 542 | mlc->imatch = node->object.packet; |
| 543 | mlc->imatch |= ((mlc->ddi + 1) << HIL_PKT_ADDR_SHIFT); |
| 544 | break; |
| 545 | case HILSE_EXPECT: |
| 546 | mlc->imatch = node->object.packet; |
| 547 | break; |
| 548 | case HILSE_IN: |
| 549 | mlc->imatch = 0; |
| 550 | break; |
| 551 | default: |
| 552 | BUG(); |
| 553 | } |
| 554 | mlc->istarted = 1; |
| 555 | mlc->intimeout = node->arg; |
| 556 | do_gettimeofday(&(mlc->instart)); |
| 557 | mlc->icount = 15; |
| 558 | memset(mlc->ipacket, 0, 16 * sizeof(hil_packet)); |
Eric Sesterhenn | b1eecf7 | 2006-03-24 18:37:43 +0100 | [diff] [blame] | 559 | BUG_ON(down_trylock(&(mlc->isem))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | |
| 561 | return; |
| 562 | } |
| 563 | |
| 564 | #ifdef HIL_MLC_DEBUG |
| 565 | static int doze = 0; |
| 566 | static int seidx; /* For debug */ |
| 567 | static int kick = 1; |
| 568 | #endif |
| 569 | |
| 570 | static int hilse_donode (hil_mlc *mlc) { |
| 571 | struct hilse_node *node; |
| 572 | int nextidx = 0; |
| 573 | int sched_long = 0; |
| 574 | unsigned long flags; |
| 575 | |
| 576 | #ifdef HIL_MLC_DEBUG |
| 577 | if (mlc->seidx && (mlc->seidx != seidx) && mlc->seidx != 41 && mlc->seidx != 42 && mlc->seidx != 43) { |
| 578 | printk(KERN_DEBUG PREFIX "z%i \n%s {%i}", doze, kick ? "K" : "", mlc->seidx); |
| 579 | doze = 0; |
| 580 | } |
| 581 | kick = 0; |
| 582 | |
| 583 | seidx = mlc->seidx; |
| 584 | #endif |
| 585 | node = hil_mlc_se + mlc->seidx; |
| 586 | |
| 587 | switch (node->act) { |
| 588 | int rc; |
| 589 | hil_packet pack; |
| 590 | |
| 591 | case HILSE_FUNC: |
| 592 | if (node->object.func == NULL) break; |
| 593 | rc = node->object.func(mlc, node->arg); |
| 594 | nextidx = (rc > 0) ? node->ugly : |
| 595 | ((rc < 0) ? node->bad : node->good); |
| 596 | if (nextidx == HILSEN_FOLLOW) nextidx = rc; |
| 597 | break; |
| 598 | case HILSE_EXPECT_LAST: |
| 599 | case HILSE_EXPECT_DISC: |
| 600 | case HILSE_EXPECT: |
| 601 | case HILSE_IN: |
| 602 | /* Already set up from previous HILSE_OUT_* */ |
| 603 | write_lock_irqsave(&(mlc->lock), flags); |
| 604 | rc = mlc->in(mlc, node->arg); |
| 605 | if (rc == 2) { |
| 606 | nextidx = HILSEN_DOZE; |
| 607 | sched_long = 1; |
| 608 | write_unlock_irqrestore(&(mlc->lock), flags); |
| 609 | break; |
| 610 | } |
| 611 | if (rc == 1) nextidx = node->ugly; |
| 612 | else if (rc == 0) nextidx = node->good; |
| 613 | else nextidx = node->bad; |
| 614 | mlc->istarted = 0; |
| 615 | write_unlock_irqrestore(&(mlc->lock), flags); |
| 616 | break; |
| 617 | case HILSE_OUT_LAST: |
| 618 | write_lock_irqsave(&(mlc->lock), flags); |
| 619 | pack = node->object.packet; |
| 620 | pack |= ((mlc->ddi + 1) << HIL_PKT_ADDR_SHIFT); |
| 621 | goto out; |
| 622 | case HILSE_OUT_DISC: |
| 623 | write_lock_irqsave(&(mlc->lock), flags); |
| 624 | pack = node->object.packet; |
| 625 | pack |= ((mlc->ddi + 2) << HIL_PKT_ADDR_SHIFT); |
| 626 | goto out; |
| 627 | case HILSE_OUT: |
| 628 | write_lock_irqsave(&(mlc->lock), flags); |
| 629 | pack = node->object.packet; |
| 630 | out: |
| 631 | if (mlc->istarted) goto out2; |
| 632 | /* Prepare to receive input */ |
| 633 | if ((node + 1)->act & HILSE_IN) |
| 634 | hilse_setup_input(mlc, node + 1); |
| 635 | |
| 636 | out2: |
| 637 | write_unlock_irqrestore(&(mlc->lock), flags); |
| 638 | |
| 639 | if (down_trylock(&mlc->osem)) { |
| 640 | nextidx = HILSEN_DOZE; |
| 641 | break; |
| 642 | } |
| 643 | up(&mlc->osem); |
| 644 | |
| 645 | write_lock_irqsave(&(mlc->lock), flags); |
| 646 | if (!(mlc->ostarted)) { |
| 647 | mlc->ostarted = 1; |
| 648 | mlc->opacket = pack; |
| 649 | mlc->out(mlc); |
| 650 | nextidx = HILSEN_DOZE; |
| 651 | write_unlock_irqrestore(&(mlc->lock), flags); |
| 652 | break; |
| 653 | } |
| 654 | mlc->ostarted = 0; |
| 655 | do_gettimeofday(&(mlc->instart)); |
| 656 | write_unlock_irqrestore(&(mlc->lock), flags); |
| 657 | nextidx = HILSEN_NEXT; |
| 658 | break; |
| 659 | case HILSE_CTS: |
| 660 | nextidx = mlc->cts(mlc) ? node->bad : node->good; |
| 661 | break; |
| 662 | default: |
| 663 | BUG(); |
| 664 | nextidx = 0; |
| 665 | break; |
| 666 | } |
| 667 | |
| 668 | #ifdef HIL_MLC_DEBUG |
| 669 | if (nextidx == HILSEN_DOZE) doze++; |
| 670 | #endif |
| 671 | |
| 672 | while (nextidx & HILSEN_SCHED) { |
| 673 | struct timeval tv; |
| 674 | |
| 675 | if (!sched_long) goto sched; |
| 676 | |
| 677 | do_gettimeofday(&tv); |
| 678 | tv.tv_usec += 1000000 * (tv.tv_sec - mlc->instart.tv_sec); |
| 679 | tv.tv_usec -= mlc->instart.tv_usec; |
| 680 | if (tv.tv_usec >= mlc->intimeout) goto sched; |
| 681 | tv.tv_usec = (mlc->intimeout - tv.tv_usec) * HZ / 1000000; |
| 682 | if (!tv.tv_usec) goto sched; |
| 683 | mod_timer(&hil_mlcs_kicker, jiffies + tv.tv_usec); |
| 684 | break; |
| 685 | sched: |
| 686 | tasklet_schedule(&hil_mlcs_tasklet); |
| 687 | break; |
| 688 | } |
| 689 | if (nextidx & HILSEN_DOWN) mlc->seidx += nextidx & HILSEN_MASK; |
| 690 | else if (nextidx & HILSEN_UP) mlc->seidx -= nextidx & HILSEN_MASK; |
| 691 | else mlc->seidx = nextidx & HILSEN_MASK; |
| 692 | |
| 693 | if (nextidx & HILSEN_BREAK) return 1; |
| 694 | return 0; |
| 695 | } |
| 696 | |
| 697 | /******************** tasklet context functions **************************/ |
| 698 | static void hil_mlcs_process(unsigned long unused) { |
| 699 | struct list_head *tmp; |
| 700 | |
| 701 | read_lock(&hil_mlcs_lock); |
| 702 | list_for_each(tmp, &hil_mlcs) { |
| 703 | struct hil_mlc *mlc = list_entry(tmp, hil_mlc, list); |
| 704 | while (hilse_donode(mlc) == 0) { |
| 705 | #ifdef HIL_MLC_DEBUG |
| 706 | if (mlc->seidx != 41 && |
| 707 | mlc->seidx != 42 && |
| 708 | mlc->seidx != 43) |
| 709 | printk(KERN_DEBUG PREFIX " + "); |
| 710 | #endif |
| 711 | }; |
| 712 | } |
| 713 | read_unlock(&hil_mlcs_lock); |
| 714 | } |
| 715 | |
| 716 | /************************* Keepalive timer task *********************/ |
| 717 | |
| 718 | void hil_mlcs_timer (unsigned long data) { |
| 719 | hil_mlcs_probe = 1; |
| 720 | tasklet_schedule(&hil_mlcs_tasklet); |
| 721 | /* Re-insert the periodic task. */ |
| 722 | if (!timer_pending(&hil_mlcs_kicker)) |
| 723 | mod_timer(&hil_mlcs_kicker, jiffies + HZ); |
| 724 | } |
| 725 | |
| 726 | /******************** user/kernel context functions **********************/ |
| 727 | |
| 728 | static int hil_mlc_serio_write(struct serio *serio, unsigned char c) { |
| 729 | struct hil_mlc_serio_map *map; |
| 730 | struct hil_mlc *mlc; |
| 731 | struct serio_driver *drv; |
| 732 | uint8_t *idx, *last; |
| 733 | |
| 734 | map = serio->port_data; |
| 735 | if (map == NULL) { |
| 736 | BUG(); |
| 737 | return -EIO; |
| 738 | } |
| 739 | mlc = map->mlc; |
| 740 | if (mlc == NULL) { |
| 741 | BUG(); |
| 742 | return -EIO; |
| 743 | } |
| 744 | mlc->serio_opacket[map->didx] |= |
| 745 | ((hil_packet)c) << (8 * (3 - mlc->serio_oidx[map->didx])); |
| 746 | |
| 747 | if (mlc->serio_oidx[map->didx] >= 3) { |
| 748 | /* for now only commands */ |
| 749 | if (!(mlc->serio_opacket[map->didx] & HIL_PKT_CMD)) |
| 750 | return -EIO; |
| 751 | switch (mlc->serio_opacket[map->didx] & HIL_PKT_DATA_MASK) { |
| 752 | case HIL_CMD_IDD: |
| 753 | idx = mlc->di[map->didx].idd; |
| 754 | goto emu; |
| 755 | case HIL_CMD_RSC: |
| 756 | idx = mlc->di[map->didx].rsc; |
| 757 | goto emu; |
| 758 | case HIL_CMD_EXD: |
| 759 | idx = mlc->di[map->didx].exd; |
| 760 | goto emu; |
| 761 | case HIL_CMD_RNM: |
| 762 | idx = mlc->di[map->didx].rnm; |
| 763 | goto emu; |
| 764 | default: |
| 765 | break; |
| 766 | } |
| 767 | mlc->serio_oidx[map->didx] = 0; |
| 768 | mlc->serio_opacket[map->didx] = 0; |
| 769 | } |
| 770 | |
| 771 | mlc->serio_oidx[map->didx]++; |
| 772 | return -EIO; |
| 773 | emu: |
| 774 | drv = serio->drv; |
| 775 | if (drv == NULL) { |
| 776 | BUG(); |
| 777 | return -EIO; |
| 778 | } |
| 779 | last = idx + 15; |
| 780 | while ((last != idx) && (*last == 0)) last--; |
| 781 | |
| 782 | while (idx != last) { |
| 783 | drv->interrupt(serio, 0, 0, NULL); |
| 784 | drv->interrupt(serio, HIL_ERR_INT >> 16, 0, NULL); |
| 785 | drv->interrupt(serio, 0, 0, NULL); |
| 786 | drv->interrupt(serio, *idx, 0, NULL); |
| 787 | idx++; |
| 788 | } |
| 789 | drv->interrupt(serio, 0, 0, NULL); |
| 790 | drv->interrupt(serio, HIL_ERR_INT >> 16, 0, NULL); |
| 791 | drv->interrupt(serio, HIL_PKT_CMD >> 8, 0, NULL); |
| 792 | drv->interrupt(serio, *idx, 0, NULL); |
| 793 | |
| 794 | mlc->serio_oidx[map->didx] = 0; |
| 795 | mlc->serio_opacket[map->didx] = 0; |
| 796 | |
| 797 | return 0; |
| 798 | } |
| 799 | |
| 800 | static int hil_mlc_serio_open(struct serio *serio) { |
| 801 | struct hil_mlc_serio_map *map; |
| 802 | struct hil_mlc *mlc; |
| 803 | |
Matthew Wilcox | 6ab0f5c | 2005-10-21 22:58:51 -0400 | [diff] [blame] | 804 | if (serio_get_drvdata(serio) != NULL) |
| 805 | return -EBUSY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | |
| 807 | map = serio->port_data; |
| 808 | if (map == NULL) { |
| 809 | BUG(); |
| 810 | return -ENODEV; |
| 811 | } |
| 812 | mlc = map->mlc; |
| 813 | if (mlc == NULL) { |
| 814 | BUG(); |
| 815 | return -ENODEV; |
| 816 | } |
| 817 | |
| 818 | return 0; |
| 819 | } |
| 820 | |
| 821 | static void hil_mlc_serio_close(struct serio *serio) { |
| 822 | struct hil_mlc_serio_map *map; |
| 823 | struct hil_mlc *mlc; |
| 824 | |
| 825 | map = serio->port_data; |
| 826 | if (map == NULL) { |
| 827 | BUG(); |
| 828 | return; |
| 829 | } |
| 830 | mlc = map->mlc; |
| 831 | if (mlc == NULL) { |
| 832 | BUG(); |
| 833 | return; |
| 834 | } |
| 835 | |
Matthew Wilcox | 6ab0f5c | 2005-10-21 22:58:51 -0400 | [diff] [blame] | 836 | serio_set_drvdata(serio, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | serio->drv = NULL; |
| 838 | /* TODO wake up interruptable */ |
| 839 | } |
| 840 | |
Matthew Wilcox | 6ab0f5c | 2005-10-21 22:58:51 -0400 | [diff] [blame] | 841 | static struct serio_device_id hil_mlc_serio_id = { |
| 842 | .type = SERIO_HIL_MLC, |
| 843 | .proto = SERIO_HIL, |
| 844 | .extra = SERIO_ANY, |
| 845 | .id = SERIO_ANY, |
| 846 | }; |
| 847 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | int hil_mlc_register(hil_mlc *mlc) { |
| 849 | int i; |
| 850 | unsigned long flags; |
| 851 | |
| 852 | if (mlc == NULL) { |
| 853 | return -EINVAL; |
| 854 | } |
| 855 | |
| 856 | mlc->istarted = 0; |
| 857 | mlc->ostarted = 0; |
| 858 | |
| 859 | rwlock_init(&mlc->lock); |
| 860 | init_MUTEX(&(mlc->osem)); |
| 861 | |
| 862 | init_MUTEX(&(mlc->isem)); |
| 863 | mlc->icount = -1; |
| 864 | mlc->imatch = 0; |
| 865 | |
| 866 | mlc->opercnt = 0; |
| 867 | |
| 868 | init_MUTEX_LOCKED(&(mlc->csem)); |
| 869 | |
| 870 | hil_mlc_clear_di_scratch(mlc); |
| 871 | hil_mlc_clear_di_map(mlc, 0); |
| 872 | for (i = 0; i < HIL_MLC_DEVMEM; i++) { |
| 873 | struct serio *mlc_serio; |
| 874 | hil_mlc_copy_di_scratch(mlc, i); |
| 875 | mlc_serio = kmalloc(sizeof(*mlc_serio), GFP_KERNEL); |
| 876 | mlc->serio[i] = mlc_serio; |
| 877 | memset(mlc_serio, 0, sizeof(*mlc_serio)); |
Matthew Wilcox | 6ab0f5c | 2005-10-21 22:58:51 -0400 | [diff] [blame] | 878 | mlc_serio->id = hil_mlc_serio_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | mlc_serio->write = hil_mlc_serio_write; |
| 880 | mlc_serio->open = hil_mlc_serio_open; |
| 881 | mlc_serio->close = hil_mlc_serio_close; |
| 882 | mlc_serio->port_data = &(mlc->serio_map[i]); |
| 883 | mlc->serio_map[i].mlc = mlc; |
| 884 | mlc->serio_map[i].didx = i; |
| 885 | mlc->serio_map[i].di_revmap = -1; |
| 886 | mlc->serio_opacket[i] = 0; |
| 887 | mlc->serio_oidx[i] = 0; |
| 888 | serio_register_port(mlc_serio); |
| 889 | } |
| 890 | |
| 891 | mlc->tasklet = &hil_mlcs_tasklet; |
| 892 | |
| 893 | write_lock_irqsave(&hil_mlcs_lock, flags); |
| 894 | list_add_tail(&mlc->list, &hil_mlcs); |
| 895 | mlc->seidx = HILSEN_START; |
| 896 | write_unlock_irqrestore(&hil_mlcs_lock, flags); |
| 897 | |
| 898 | tasklet_schedule(&hil_mlcs_tasklet); |
| 899 | return 0; |
| 900 | } |
| 901 | |
| 902 | int hil_mlc_unregister(hil_mlc *mlc) { |
| 903 | struct list_head *tmp; |
| 904 | unsigned long flags; |
| 905 | int i; |
| 906 | |
| 907 | if (mlc == NULL) |
| 908 | return -EINVAL; |
| 909 | |
| 910 | write_lock_irqsave(&hil_mlcs_lock, flags); |
| 911 | list_for_each(tmp, &hil_mlcs) { |
| 912 | if (list_entry(tmp, hil_mlc, list) == mlc) |
| 913 | goto found; |
| 914 | } |
| 915 | |
| 916 | /* not found in list */ |
| 917 | write_unlock_irqrestore(&hil_mlcs_lock, flags); |
| 918 | tasklet_schedule(&hil_mlcs_tasklet); |
| 919 | return -ENODEV; |
| 920 | |
| 921 | found: |
| 922 | list_del(tmp); |
| 923 | write_unlock_irqrestore(&hil_mlcs_lock, flags); |
| 924 | |
| 925 | for (i = 0; i < HIL_MLC_DEVMEM; i++) { |
| 926 | serio_unregister_port(mlc->serio[i]); |
| 927 | mlc->serio[i] = NULL; |
| 928 | } |
| 929 | |
| 930 | tasklet_schedule(&hil_mlcs_tasklet); |
| 931 | return 0; |
| 932 | } |
| 933 | |
| 934 | /**************************** Module interface *************************/ |
| 935 | |
| 936 | static int __init hil_mlc_init(void) |
| 937 | { |
| 938 | init_timer(&hil_mlcs_kicker); |
| 939 | hil_mlcs_kicker.expires = jiffies + HZ; |
| 940 | hil_mlcs_kicker.function = &hil_mlcs_timer; |
| 941 | add_timer(&hil_mlcs_kicker); |
| 942 | |
| 943 | tasklet_enable(&hil_mlcs_tasklet); |
| 944 | |
| 945 | return 0; |
| 946 | } |
| 947 | |
| 948 | static void __exit hil_mlc_exit(void) |
| 949 | { |
| 950 | del_timer(&hil_mlcs_kicker); |
| 951 | |
| 952 | tasklet_disable(&hil_mlcs_tasklet); |
| 953 | tasklet_kill(&hil_mlcs_tasklet); |
| 954 | } |
| 955 | |
| 956 | module_init(hil_mlc_init); |
| 957 | module_exit(hil_mlc_exit); |