| 1 | /* |
| 2 | * ec.c - ACPI Embedded Controller Driver (v2.1) |
| 3 | * |
| 4 | * Copyright (C) 2006-2008 Alexey Starikovskiy <astarikovskiy@suse.de> |
| 5 | * Copyright (C) 2006 Denis Sadykov <denis.m.sadykov@intel.com> |
| 6 | * Copyright (C) 2004 Luming Yu <luming.yu@intel.com> |
| 7 | * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> |
| 8 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> |
| 9 | * |
| 10 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU General Public License as published by |
| 14 | * the Free Software Foundation; either version 2 of the License, or (at |
| 15 | * your option) any later version. |
| 16 | * |
| 17 | * This program is distributed in the hope that it will be useful, but |
| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 20 | * General Public License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU General Public License along |
| 23 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 24 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. |
| 25 | * |
| 26 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 27 | */ |
| 28 | |
| 29 | /* Uncomment next line to get verbose printout */ |
| 30 | /* #define DEBUG */ |
| 31 | |
| 32 | #include <linux/kernel.h> |
| 33 | #include <linux/module.h> |
| 34 | #include <linux/init.h> |
| 35 | #include <linux/types.h> |
| 36 | #include <linux/delay.h> |
| 37 | #include <linux/proc_fs.h> |
| 38 | #include <linux/seq_file.h> |
| 39 | #include <linux/interrupt.h> |
| 40 | #include <linux/list.h> |
| 41 | #include <linux/spinlock.h> |
| 42 | #include <asm/io.h> |
| 43 | #include <acpi/acpi_bus.h> |
| 44 | #include <acpi/acpi_drivers.h> |
| 45 | |
| 46 | #define ACPI_EC_CLASS "embedded_controller" |
| 47 | #define ACPI_EC_DEVICE_NAME "Embedded Controller" |
| 48 | #define ACPI_EC_FILE_INFO "info" |
| 49 | |
| 50 | #undef PREFIX |
| 51 | #define PREFIX "ACPI: EC: " |
| 52 | |
| 53 | /* EC status register */ |
| 54 | #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */ |
| 55 | #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */ |
| 56 | #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */ |
| 57 | #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */ |
| 58 | |
| 59 | /* EC commands */ |
| 60 | enum ec_command { |
| 61 | ACPI_EC_COMMAND_READ = 0x80, |
| 62 | ACPI_EC_COMMAND_WRITE = 0x81, |
| 63 | ACPI_EC_BURST_ENABLE = 0x82, |
| 64 | ACPI_EC_BURST_DISABLE = 0x83, |
| 65 | ACPI_EC_COMMAND_QUERY = 0x84, |
| 66 | }; |
| 67 | |
| 68 | #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */ |
| 69 | #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ |
| 70 | #define ACPI_EC_UDELAY 100 /* Wait 100us before polling EC again */ |
| 71 | |
| 72 | #define ACPI_EC_STORM_THRESHOLD 8 /* number of false interrupts |
| 73 | per one transaction */ |
| 74 | |
| 75 | enum { |
| 76 | EC_FLAGS_QUERY_PENDING, /* Query is pending */ |
| 77 | EC_FLAGS_GPE_MODE, /* Expect GPE to be sent |
| 78 | * for status change */ |
| 79 | EC_FLAGS_NO_GPE, /* Don't use GPE mode */ |
| 80 | EC_FLAGS_GPE_STORM, /* GPE storm detected */ |
| 81 | EC_FLAGS_HANDLERS_INSTALLED /* Handlers for GPE and |
| 82 | * OpReg are installed */ |
| 83 | }; |
| 84 | |
| 85 | /* If we find an EC via the ECDT, we need to keep a ptr to its context */ |
| 86 | /* External interfaces use first EC only, so remember */ |
| 87 | typedef int (*acpi_ec_query_func) (void *data); |
| 88 | |
| 89 | struct acpi_ec_query_handler { |
| 90 | struct list_head node; |
| 91 | acpi_ec_query_func func; |
| 92 | acpi_handle handle; |
| 93 | void *data; |
| 94 | u8 query_bit; |
| 95 | }; |
| 96 | |
| 97 | struct transaction { |
| 98 | const u8 *wdata; |
| 99 | u8 *rdata; |
| 100 | unsigned short irq_count; |
| 101 | u8 command; |
| 102 | u8 wi; |
| 103 | u8 ri; |
| 104 | u8 wlen; |
| 105 | u8 rlen; |
| 106 | bool done; |
| 107 | }; |
| 108 | |
| 109 | static struct acpi_ec { |
| 110 | acpi_handle handle; |
| 111 | unsigned long gpe; |
| 112 | unsigned long command_addr; |
| 113 | unsigned long data_addr; |
| 114 | unsigned long global_lock; |
| 115 | unsigned long flags; |
| 116 | struct mutex lock; |
| 117 | wait_queue_head_t wait; |
| 118 | struct list_head list; |
| 119 | struct transaction *curr; |
| 120 | spinlock_t curr_lock; |
| 121 | } *boot_ec, *first_ec; |
| 122 | |
| 123 | static int EC_FLAGS_MSI; /* Out-of-spec MSI controller */ |
| 124 | |
| 125 | /* -------------------------------------------------------------------------- |
| 126 | Transaction Management |
| 127 | -------------------------------------------------------------------------- */ |
| 128 | |
| 129 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
| 130 | { |
| 131 | u8 x = inb(ec->command_addr); |
| 132 | pr_debug(PREFIX "---> status = 0x%2.2x\n", x); |
| 133 | return x; |
| 134 | } |
| 135 | |
| 136 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
| 137 | { |
| 138 | u8 x = inb(ec->data_addr); |
| 139 | pr_debug(PREFIX "---> data = 0x%2.2x\n", x); |
| 140 | return x; |
| 141 | } |
| 142 | |
| 143 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
| 144 | { |
| 145 | pr_debug(PREFIX "<--- command = 0x%2.2x\n", command); |
| 146 | outb(command, ec->command_addr); |
| 147 | } |
| 148 | |
| 149 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
| 150 | { |
| 151 | pr_debug(PREFIX "<--- data = 0x%2.2x\n", data); |
| 152 | outb(data, ec->data_addr); |
| 153 | } |
| 154 | |
| 155 | static int ec_transaction_done(struct acpi_ec *ec) |
| 156 | { |
| 157 | unsigned long flags; |
| 158 | int ret = 0; |
| 159 | spin_lock_irqsave(&ec->curr_lock, flags); |
| 160 | if (!ec->curr || ec->curr->done) |
| 161 | ret = 1; |
| 162 | spin_unlock_irqrestore(&ec->curr_lock, flags); |
| 163 | return ret; |
| 164 | } |
| 165 | |
| 166 | static void start_transaction(struct acpi_ec *ec) |
| 167 | { |
| 168 | ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0; |
| 169 | ec->curr->done = false; |
| 170 | acpi_ec_write_cmd(ec, ec->curr->command); |
| 171 | } |
| 172 | |
| 173 | static void gpe_transaction(struct acpi_ec *ec, u8 status) |
| 174 | { |
| 175 | unsigned long flags; |
| 176 | spin_lock_irqsave(&ec->curr_lock, flags); |
| 177 | if (!ec->curr) |
| 178 | goto unlock; |
| 179 | if (ec->curr->wlen > ec->curr->wi) { |
| 180 | if ((status & ACPI_EC_FLAG_IBF) == 0) |
| 181 | acpi_ec_write_data(ec, |
| 182 | ec->curr->wdata[ec->curr->wi++]); |
| 183 | else |
| 184 | goto err; |
| 185 | } else if (ec->curr->rlen > ec->curr->ri) { |
| 186 | if ((status & ACPI_EC_FLAG_OBF) == 1) { |
| 187 | ec->curr->rdata[ec->curr->ri++] = acpi_ec_read_data(ec); |
| 188 | if (ec->curr->rlen == ec->curr->ri) |
| 189 | ec->curr->done = true; |
| 190 | } else |
| 191 | goto err; |
| 192 | } else if (ec->curr->wlen == ec->curr->wi && |
| 193 | (status & ACPI_EC_FLAG_IBF) == 0) |
| 194 | ec->curr->done = true; |
| 195 | goto unlock; |
| 196 | err: |
| 197 | /* false interrupt, state didn't change */ |
| 198 | if (in_interrupt()) |
| 199 | ++ec->curr->irq_count; |
| 200 | unlock: |
| 201 | spin_unlock_irqrestore(&ec->curr_lock, flags); |
| 202 | } |
| 203 | |
| 204 | static int acpi_ec_wait(struct acpi_ec *ec) |
| 205 | { |
| 206 | if (wait_event_timeout(ec->wait, ec_transaction_done(ec), |
| 207 | msecs_to_jiffies(ACPI_EC_DELAY))) |
| 208 | return 0; |
| 209 | /* try restart command if we get any false interrupts */ |
| 210 | if (ec->curr->irq_count && |
| 211 | (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) == 0) { |
| 212 | pr_debug(PREFIX "controller reset, restart transaction\n"); |
| 213 | start_transaction(ec); |
| 214 | if (wait_event_timeout(ec->wait, ec_transaction_done(ec), |
| 215 | msecs_to_jiffies(ACPI_EC_DELAY))) |
| 216 | return 0; |
| 217 | } |
| 218 | /* missing GPEs, switch back to poll mode */ |
| 219 | if (printk_ratelimit()) |
| 220 | pr_info(PREFIX "missing confirmations, " |
| 221 | "switch off interrupt mode.\n"); |
| 222 | set_bit(EC_FLAGS_NO_GPE, &ec->flags); |
| 223 | clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); |
| 224 | return 1; |
| 225 | } |
| 226 | |
| 227 | static void acpi_ec_gpe_query(void *ec_cxt); |
| 228 | |
| 229 | static int ec_check_sci(struct acpi_ec *ec, u8 state) |
| 230 | { |
| 231 | if (state & ACPI_EC_FLAG_SCI) { |
| 232 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) |
| 233 | return acpi_os_execute(OSL_EC_BURST_HANDLER, |
| 234 | acpi_ec_gpe_query, ec); |
| 235 | } |
| 236 | return 0; |
| 237 | } |
| 238 | |
| 239 | static int ec_poll(struct acpi_ec *ec) |
| 240 | { |
| 241 | unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); |
| 242 | udelay(ACPI_EC_UDELAY); |
| 243 | while (time_before(jiffies, delay)) { |
| 244 | gpe_transaction(ec, acpi_ec_read_status(ec)); |
| 245 | udelay(ACPI_EC_UDELAY); |
| 246 | if (ec_transaction_done(ec)) |
| 247 | return 0; |
| 248 | } |
| 249 | return -ETIME; |
| 250 | } |
| 251 | |
| 252 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
| 253 | struct transaction *t, |
| 254 | int force_poll) |
| 255 | { |
| 256 | unsigned long tmp; |
| 257 | int ret = 0; |
| 258 | pr_debug(PREFIX "transaction start\n"); |
| 259 | /* disable GPE during transaction if storm is detected */ |
| 260 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { |
| 261 | clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); |
| 262 | acpi_disable_gpe(NULL, ec->gpe); |
| 263 | } |
| 264 | if (EC_FLAGS_MSI) |
| 265 | udelay(ACPI_EC_DELAY); |
| 266 | /* start transaction */ |
| 267 | spin_lock_irqsave(&ec->curr_lock, tmp); |
| 268 | /* following two actions should be kept atomic */ |
| 269 | ec->curr = t; |
| 270 | start_transaction(ec); |
| 271 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) |
| 272 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
| 273 | spin_unlock_irqrestore(&ec->curr_lock, tmp); |
| 274 | /* if we selected poll mode or failed in GPE-mode do a poll loop */ |
| 275 | if (force_poll || |
| 276 | !test_bit(EC_FLAGS_GPE_MODE, &ec->flags) || |
| 277 | acpi_ec_wait(ec)) |
| 278 | ret = ec_poll(ec); |
| 279 | pr_debug(PREFIX "transaction end\n"); |
| 280 | spin_lock_irqsave(&ec->curr_lock, tmp); |
| 281 | ec->curr = NULL; |
| 282 | spin_unlock_irqrestore(&ec->curr_lock, tmp); |
| 283 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { |
| 284 | /* check if we received SCI during transaction */ |
| 285 | ec_check_sci(ec, acpi_ec_read_status(ec)); |
| 286 | /* it is safe to enable GPE outside of transaction */ |
| 287 | acpi_enable_gpe(NULL, ec->gpe); |
| 288 | } else if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags) && |
| 289 | t->irq_count > ACPI_EC_STORM_THRESHOLD) { |
| 290 | pr_info(PREFIX "GPE storm detected, " |
| 291 | "transactions will use polling mode\n"); |
| 292 | set_bit(EC_FLAGS_GPE_STORM, &ec->flags); |
| 293 | } |
| 294 | return ret; |
| 295 | } |
| 296 | |
| 297 | static int ec_check_ibf0(struct acpi_ec *ec) |
| 298 | { |
| 299 | u8 status = acpi_ec_read_status(ec); |
| 300 | return (status & ACPI_EC_FLAG_IBF) == 0; |
| 301 | } |
| 302 | |
| 303 | static int ec_wait_ibf0(struct acpi_ec *ec) |
| 304 | { |
| 305 | unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); |
| 306 | /* interrupt wait manually if GPE mode is not active */ |
| 307 | unsigned long timeout = test_bit(EC_FLAGS_GPE_MODE, &ec->flags) ? |
| 308 | msecs_to_jiffies(ACPI_EC_DELAY) : msecs_to_jiffies(1); |
| 309 | while (time_before(jiffies, delay)) |
| 310 | if (wait_event_timeout(ec->wait, ec_check_ibf0(ec), timeout)) |
| 311 | return 0; |
| 312 | return -ETIME; |
| 313 | } |
| 314 | |
| 315 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t, |
| 316 | int force_poll) |
| 317 | { |
| 318 | int status; |
| 319 | u32 glk; |
| 320 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
| 321 | return -EINVAL; |
| 322 | if (t->rdata) |
| 323 | memset(t->rdata, 0, t->rlen); |
| 324 | mutex_lock(&ec->lock); |
| 325 | if (ec->global_lock) { |
| 326 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
| 327 | if (ACPI_FAILURE(status)) { |
| 328 | status = -ENODEV; |
| 329 | goto unlock; |
| 330 | } |
| 331 | } |
| 332 | if (ec_wait_ibf0(ec)) { |
| 333 | pr_err(PREFIX "input buffer is not empty, " |
| 334 | "aborting transaction\n"); |
| 335 | status = -ETIME; |
| 336 | goto end; |
| 337 | } |
| 338 | status = acpi_ec_transaction_unlocked(ec, t, force_poll); |
| 339 | end: |
| 340 | if (ec->global_lock) |
| 341 | acpi_release_global_lock(glk); |
| 342 | unlock: |
| 343 | mutex_unlock(&ec->lock); |
| 344 | return status; |
| 345 | } |
| 346 | |
| 347 | /* |
| 348 | * Note: samsung nv5000 doesn't work with ec burst mode. |
| 349 | * http://bugzilla.kernel.org/show_bug.cgi?id=4980 |
| 350 | */ |
| 351 | static int acpi_ec_burst_enable(struct acpi_ec *ec) |
| 352 | { |
| 353 | u8 d; |
| 354 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
| 355 | .wdata = NULL, .rdata = &d, |
| 356 | .wlen = 0, .rlen = 1}; |
| 357 | |
| 358 | return acpi_ec_transaction(ec, &t, 0); |
| 359 | } |
| 360 | |
| 361 | static int acpi_ec_burst_disable(struct acpi_ec *ec) |
| 362 | { |
| 363 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
| 364 | .wdata = NULL, .rdata = NULL, |
| 365 | .wlen = 0, .rlen = 0}; |
| 366 | |
| 367 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
| 368 | acpi_ec_transaction(ec, &t, 0) : 0; |
| 369 | } |
| 370 | |
| 371 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) |
| 372 | { |
| 373 | int result; |
| 374 | u8 d; |
| 375 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
| 376 | .wdata = &address, .rdata = &d, |
| 377 | .wlen = 1, .rlen = 1}; |
| 378 | |
| 379 | result = acpi_ec_transaction(ec, &t, 0); |
| 380 | *data = d; |
| 381 | return result; |
| 382 | } |
| 383 | |
| 384 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
| 385 | { |
| 386 | u8 wdata[2] = { address, data }; |
| 387 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
| 388 | .wdata = wdata, .rdata = NULL, |
| 389 | .wlen = 2, .rlen = 0}; |
| 390 | |
| 391 | return acpi_ec_transaction(ec, &t, 0); |
| 392 | } |
| 393 | |
| 394 | /* |
| 395 | * Externally callable EC access functions. For now, assume 1 EC only |
| 396 | */ |
| 397 | int ec_burst_enable(void) |
| 398 | { |
| 399 | if (!first_ec) |
| 400 | return -ENODEV; |
| 401 | return acpi_ec_burst_enable(first_ec); |
| 402 | } |
| 403 | |
| 404 | EXPORT_SYMBOL(ec_burst_enable); |
| 405 | |
| 406 | int ec_burst_disable(void) |
| 407 | { |
| 408 | if (!first_ec) |
| 409 | return -ENODEV; |
| 410 | return acpi_ec_burst_disable(first_ec); |
| 411 | } |
| 412 | |
| 413 | EXPORT_SYMBOL(ec_burst_disable); |
| 414 | |
| 415 | int ec_read(u8 addr, u8 * val) |
| 416 | { |
| 417 | int err; |
| 418 | u8 temp_data; |
| 419 | |
| 420 | if (!first_ec) |
| 421 | return -ENODEV; |
| 422 | |
| 423 | err = acpi_ec_read(first_ec, addr, &temp_data); |
| 424 | |
| 425 | if (!err) { |
| 426 | *val = temp_data; |
| 427 | return 0; |
| 428 | } else |
| 429 | return err; |
| 430 | } |
| 431 | |
| 432 | EXPORT_SYMBOL(ec_read); |
| 433 | |
| 434 | int ec_write(u8 addr, u8 val) |
| 435 | { |
| 436 | int err; |
| 437 | |
| 438 | if (!first_ec) |
| 439 | return -ENODEV; |
| 440 | |
| 441 | err = acpi_ec_write(first_ec, addr, val); |
| 442 | |
| 443 | return err; |
| 444 | } |
| 445 | |
| 446 | EXPORT_SYMBOL(ec_write); |
| 447 | |
| 448 | int ec_transaction(u8 command, |
| 449 | const u8 * wdata, unsigned wdata_len, |
| 450 | u8 * rdata, unsigned rdata_len, |
| 451 | int force_poll) |
| 452 | { |
| 453 | struct transaction t = {.command = command, |
| 454 | .wdata = wdata, .rdata = rdata, |
| 455 | .wlen = wdata_len, .rlen = rdata_len}; |
| 456 | if (!first_ec) |
| 457 | return -ENODEV; |
| 458 | |
| 459 | return acpi_ec_transaction(first_ec, &t, force_poll); |
| 460 | } |
| 461 | |
| 462 | EXPORT_SYMBOL(ec_transaction); |
| 463 | |
| 464 | static int acpi_ec_query(struct acpi_ec *ec, u8 * data) |
| 465 | { |
| 466 | int result; |
| 467 | u8 d; |
| 468 | struct transaction t = {.command = ACPI_EC_COMMAND_QUERY, |
| 469 | .wdata = NULL, .rdata = &d, |
| 470 | .wlen = 0, .rlen = 1}; |
| 471 | if (!ec || !data) |
| 472 | return -EINVAL; |
| 473 | |
| 474 | /* |
| 475 | * Query the EC to find out which _Qxx method we need to evaluate. |
| 476 | * Note that successful completion of the query causes the ACPI_EC_SCI |
| 477 | * bit to be cleared (and thus clearing the interrupt source). |
| 478 | */ |
| 479 | |
| 480 | result = acpi_ec_transaction(ec, &t, 0); |
| 481 | if (result) |
| 482 | return result; |
| 483 | |
| 484 | if (!d) |
| 485 | return -ENODATA; |
| 486 | |
| 487 | *data = d; |
| 488 | return 0; |
| 489 | } |
| 490 | |
| 491 | /* -------------------------------------------------------------------------- |
| 492 | Event Management |
| 493 | -------------------------------------------------------------------------- */ |
| 494 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
| 495 | acpi_handle handle, acpi_ec_query_func func, |
| 496 | void *data) |
| 497 | { |
| 498 | struct acpi_ec_query_handler *handler = |
| 499 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); |
| 500 | if (!handler) |
| 501 | return -ENOMEM; |
| 502 | |
| 503 | handler->query_bit = query_bit; |
| 504 | handler->handle = handle; |
| 505 | handler->func = func; |
| 506 | handler->data = data; |
| 507 | mutex_lock(&ec->lock); |
| 508 | list_add(&handler->node, &ec->list); |
| 509 | mutex_unlock(&ec->lock); |
| 510 | return 0; |
| 511 | } |
| 512 | |
| 513 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); |
| 514 | |
| 515 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) |
| 516 | { |
| 517 | struct acpi_ec_query_handler *handler, *tmp; |
| 518 | mutex_lock(&ec->lock); |
| 519 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
| 520 | if (query_bit == handler->query_bit) { |
| 521 | list_del(&handler->node); |
| 522 | kfree(handler); |
| 523 | } |
| 524 | } |
| 525 | mutex_unlock(&ec->lock); |
| 526 | } |
| 527 | |
| 528 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); |
| 529 | |
| 530 | static void acpi_ec_gpe_query(void *ec_cxt) |
| 531 | { |
| 532 | struct acpi_ec *ec = ec_cxt; |
| 533 | u8 value = 0; |
| 534 | struct acpi_ec_query_handler *handler, copy; |
| 535 | |
| 536 | if (!ec || acpi_ec_query(ec, &value)) |
| 537 | return; |
| 538 | mutex_lock(&ec->lock); |
| 539 | list_for_each_entry(handler, &ec->list, node) { |
| 540 | if (value == handler->query_bit) { |
| 541 | /* have custom handler for this bit */ |
| 542 | memcpy(©, handler, sizeof(copy)); |
| 543 | mutex_unlock(&ec->lock); |
| 544 | if (copy.func) { |
| 545 | copy.func(copy.data); |
| 546 | } else if (copy.handle) { |
| 547 | acpi_evaluate_object(copy.handle, NULL, NULL, NULL); |
| 548 | } |
| 549 | return; |
| 550 | } |
| 551 | } |
| 552 | mutex_unlock(&ec->lock); |
| 553 | } |
| 554 | |
| 555 | static u32 acpi_ec_gpe_handler(void *data) |
| 556 | { |
| 557 | struct acpi_ec *ec = data; |
| 558 | u8 status; |
| 559 | |
| 560 | pr_debug(PREFIX "~~~> interrupt\n"); |
| 561 | status = acpi_ec_read_status(ec); |
| 562 | |
| 563 | if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags)) { |
| 564 | gpe_transaction(ec, status); |
| 565 | if (ec_transaction_done(ec) && |
| 566 | (status & ACPI_EC_FLAG_IBF) == 0) |
| 567 | wake_up(&ec->wait); |
| 568 | } |
| 569 | |
| 570 | ec_check_sci(ec, status); |
| 571 | if (!test_bit(EC_FLAGS_GPE_MODE, &ec->flags) && |
| 572 | !test_bit(EC_FLAGS_NO_GPE, &ec->flags)) { |
| 573 | /* this is non-query, must be confirmation */ |
| 574 | if (!test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { |
| 575 | if (printk_ratelimit()) |
| 576 | pr_info(PREFIX "non-query interrupt received," |
| 577 | " switching to interrupt mode\n"); |
| 578 | } else { |
| 579 | /* hush, STORM switches the mode every transaction */ |
| 580 | pr_debug(PREFIX "non-query interrupt received," |
| 581 | " switching to interrupt mode\n"); |
| 582 | } |
| 583 | set_bit(EC_FLAGS_GPE_MODE, &ec->flags); |
| 584 | } |
| 585 | return ACPI_INTERRUPT_HANDLED; |
| 586 | } |
| 587 | |
| 588 | /* -------------------------------------------------------------------------- |
| 589 | Address Space Management |
| 590 | -------------------------------------------------------------------------- */ |
| 591 | |
| 592 | static acpi_status |
| 593 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
| 594 | u32 bits, acpi_integer *value, |
| 595 | void *handler_context, void *region_context) |
| 596 | { |
| 597 | struct acpi_ec *ec = handler_context; |
| 598 | int result = 0, i; |
| 599 | u8 temp = 0; |
| 600 | |
| 601 | if ((address > 0xFF) || !value || !handler_context) |
| 602 | return AE_BAD_PARAMETER; |
| 603 | |
| 604 | if (function != ACPI_READ && function != ACPI_WRITE) |
| 605 | return AE_BAD_PARAMETER; |
| 606 | |
| 607 | if (bits != 8 && acpi_strict) |
| 608 | return AE_BAD_PARAMETER; |
| 609 | |
| 610 | acpi_ec_burst_enable(ec); |
| 611 | |
| 612 | if (function == ACPI_READ) { |
| 613 | result = acpi_ec_read(ec, address, &temp); |
| 614 | *value = temp; |
| 615 | } else { |
| 616 | temp = 0xff & (*value); |
| 617 | result = acpi_ec_write(ec, address, temp); |
| 618 | } |
| 619 | |
| 620 | for (i = 8; unlikely(bits - i > 0); i += 8) { |
| 621 | ++address; |
| 622 | if (function == ACPI_READ) { |
| 623 | result = acpi_ec_read(ec, address, &temp); |
| 624 | (*value) |= ((acpi_integer)temp) << i; |
| 625 | } else { |
| 626 | temp = 0xff & ((*value) >> i); |
| 627 | result = acpi_ec_write(ec, address, temp); |
| 628 | } |
| 629 | } |
| 630 | |
| 631 | acpi_ec_burst_disable(ec); |
| 632 | |
| 633 | switch (result) { |
| 634 | case -EINVAL: |
| 635 | return AE_BAD_PARAMETER; |
| 636 | break; |
| 637 | case -ENODEV: |
| 638 | return AE_NOT_FOUND; |
| 639 | break; |
| 640 | case -ETIME: |
| 641 | return AE_TIME; |
| 642 | break; |
| 643 | default: |
| 644 | return AE_OK; |
| 645 | } |
| 646 | } |
| 647 | |
| 648 | /* -------------------------------------------------------------------------- |
| 649 | FS Interface (/proc) |
| 650 | -------------------------------------------------------------------------- */ |
| 651 | |
| 652 | static struct proc_dir_entry *acpi_ec_dir; |
| 653 | |
| 654 | static int acpi_ec_read_info(struct seq_file *seq, void *offset) |
| 655 | { |
| 656 | struct acpi_ec *ec = seq->private; |
| 657 | |
| 658 | if (!ec) |
| 659 | goto end; |
| 660 | |
| 661 | seq_printf(seq, "gpe:\t\t\t0x%02x\n", (u32) ec->gpe); |
| 662 | seq_printf(seq, "ports:\t\t\t0x%02x, 0x%02x\n", |
| 663 | (unsigned)ec->command_addr, (unsigned)ec->data_addr); |
| 664 | seq_printf(seq, "use global lock:\t%s\n", |
| 665 | ec->global_lock ? "yes" : "no"); |
| 666 | end: |
| 667 | return 0; |
| 668 | } |
| 669 | |
| 670 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) |
| 671 | { |
| 672 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); |
| 673 | } |
| 674 | |
| 675 | static struct file_operations acpi_ec_info_ops = { |
| 676 | .open = acpi_ec_info_open_fs, |
| 677 | .read = seq_read, |
| 678 | .llseek = seq_lseek, |
| 679 | .release = single_release, |
| 680 | .owner = THIS_MODULE, |
| 681 | }; |
| 682 | |
| 683 | static int acpi_ec_add_fs(struct acpi_device *device) |
| 684 | { |
| 685 | struct proc_dir_entry *entry = NULL; |
| 686 | |
| 687 | if (!acpi_device_dir(device)) { |
| 688 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), |
| 689 | acpi_ec_dir); |
| 690 | if (!acpi_device_dir(device)) |
| 691 | return -ENODEV; |
| 692 | } |
| 693 | |
| 694 | entry = proc_create_data(ACPI_EC_FILE_INFO, S_IRUGO, |
| 695 | acpi_device_dir(device), |
| 696 | &acpi_ec_info_ops, acpi_driver_data(device)); |
| 697 | if (!entry) |
| 698 | return -ENODEV; |
| 699 | return 0; |
| 700 | } |
| 701 | |
| 702 | static int acpi_ec_remove_fs(struct acpi_device *device) |
| 703 | { |
| 704 | |
| 705 | if (acpi_device_dir(device)) { |
| 706 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); |
| 707 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); |
| 708 | acpi_device_dir(device) = NULL; |
| 709 | } |
| 710 | |
| 711 | return 0; |
| 712 | } |
| 713 | |
| 714 | /* -------------------------------------------------------------------------- |
| 715 | Driver Interface |
| 716 | -------------------------------------------------------------------------- */ |
| 717 | static acpi_status |
| 718 | ec_parse_io_ports(struct acpi_resource *resource, void *context); |
| 719 | |
| 720 | static struct acpi_ec *make_acpi_ec(void) |
| 721 | { |
| 722 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
| 723 | if (!ec) |
| 724 | return NULL; |
| 725 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
| 726 | mutex_init(&ec->lock); |
| 727 | init_waitqueue_head(&ec->wait); |
| 728 | INIT_LIST_HEAD(&ec->list); |
| 729 | spin_lock_init(&ec->curr_lock); |
| 730 | return ec; |
| 731 | } |
| 732 | |
| 733 | static acpi_status |
| 734 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, |
| 735 | void *context, void **return_value) |
| 736 | { |
| 737 | char node_name[5]; |
| 738 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; |
| 739 | struct acpi_ec *ec = context; |
| 740 | int value = 0; |
| 741 | acpi_status status; |
| 742 | |
| 743 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); |
| 744 | |
| 745 | if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) { |
| 746 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
| 747 | } |
| 748 | return AE_OK; |
| 749 | } |
| 750 | |
| 751 | static acpi_status |
| 752 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) |
| 753 | { |
| 754 | acpi_status status; |
| 755 | unsigned long long tmp = 0; |
| 756 | |
| 757 | struct acpi_ec *ec = context; |
| 758 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
| 759 | ec_parse_io_ports, ec); |
| 760 | if (ACPI_FAILURE(status)) |
| 761 | return status; |
| 762 | |
| 763 | /* Get GPE bit assignment (EC events). */ |
| 764 | /* TODO: Add support for _GPE returning a package */ |
| 765 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
| 766 | if (ACPI_FAILURE(status)) |
| 767 | return status; |
| 768 | ec->gpe = tmp; |
| 769 | /* Use the global lock for all EC transactions? */ |
| 770 | tmp = 0; |
| 771 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
| 772 | ec->global_lock = tmp; |
| 773 | ec->handle = handle; |
| 774 | return AE_CTRL_TERMINATE; |
| 775 | } |
| 776 | |
| 777 | static void ec_remove_handlers(struct acpi_ec *ec) |
| 778 | { |
| 779 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, |
| 780 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) |
| 781 | pr_err(PREFIX "failed to remove space handler\n"); |
| 782 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
| 783 | &acpi_ec_gpe_handler))) |
| 784 | pr_err(PREFIX "failed to remove gpe handler\n"); |
| 785 | clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
| 786 | } |
| 787 | |
| 788 | static int acpi_ec_add(struct acpi_device *device) |
| 789 | { |
| 790 | struct acpi_ec *ec = NULL; |
| 791 | |
| 792 | if (!device) |
| 793 | return -EINVAL; |
| 794 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
| 795 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); |
| 796 | |
| 797 | /* Check for boot EC */ |
| 798 | if (boot_ec && |
| 799 | (boot_ec->handle == device->handle || |
| 800 | boot_ec->handle == ACPI_ROOT_OBJECT)) { |
| 801 | ec = boot_ec; |
| 802 | boot_ec = NULL; |
| 803 | } else { |
| 804 | ec = make_acpi_ec(); |
| 805 | if (!ec) |
| 806 | return -ENOMEM; |
| 807 | if (ec_parse_device(device->handle, 0, ec, NULL) != |
| 808 | AE_CTRL_TERMINATE) { |
| 809 | kfree(ec); |
| 810 | return -EINVAL; |
| 811 | } |
| 812 | } |
| 813 | |
| 814 | ec->handle = device->handle; |
| 815 | |
| 816 | /* Find and register all query methods */ |
| 817 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, |
| 818 | acpi_ec_register_query_methods, ec, NULL); |
| 819 | |
| 820 | if (!first_ec) |
| 821 | first_ec = ec; |
| 822 | device->driver_data = ec; |
| 823 | acpi_ec_add_fs(device); |
| 824 | pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
| 825 | ec->gpe, ec->command_addr, ec->data_addr); |
| 826 | pr_info(PREFIX "driver started in %s mode\n", |
| 827 | (test_bit(EC_FLAGS_GPE_MODE, &ec->flags))?"interrupt":"poll"); |
| 828 | return 0; |
| 829 | } |
| 830 | |
| 831 | static int acpi_ec_remove(struct acpi_device *device, int type) |
| 832 | { |
| 833 | struct acpi_ec *ec; |
| 834 | struct acpi_ec_query_handler *handler, *tmp; |
| 835 | |
| 836 | if (!device) |
| 837 | return -EINVAL; |
| 838 | |
| 839 | ec = acpi_driver_data(device); |
| 840 | mutex_lock(&ec->lock); |
| 841 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
| 842 | list_del(&handler->node); |
| 843 | kfree(handler); |
| 844 | } |
| 845 | mutex_unlock(&ec->lock); |
| 846 | acpi_ec_remove_fs(device); |
| 847 | device->driver_data = NULL; |
| 848 | if (ec == first_ec) |
| 849 | first_ec = NULL; |
| 850 | kfree(ec); |
| 851 | return 0; |
| 852 | } |
| 853 | |
| 854 | static acpi_status |
| 855 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
| 856 | { |
| 857 | struct acpi_ec *ec = context; |
| 858 | |
| 859 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
| 860 | return AE_OK; |
| 861 | |
| 862 | /* |
| 863 | * The first address region returned is the data port, and |
| 864 | * the second address region returned is the status/command |
| 865 | * port. |
| 866 | */ |
| 867 | if (ec->data_addr == 0) |
| 868 | ec->data_addr = resource->data.io.minimum; |
| 869 | else if (ec->command_addr == 0) |
| 870 | ec->command_addr = resource->data.io.minimum; |
| 871 | else |
| 872 | return AE_CTRL_TERMINATE; |
| 873 | |
| 874 | return AE_OK; |
| 875 | } |
| 876 | |
| 877 | static int ec_install_handlers(struct acpi_ec *ec) |
| 878 | { |
| 879 | acpi_status status; |
| 880 | if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) |
| 881 | return 0; |
| 882 | status = acpi_install_gpe_handler(NULL, ec->gpe, |
| 883 | ACPI_GPE_EDGE_TRIGGERED, |
| 884 | &acpi_ec_gpe_handler, ec); |
| 885 | if (ACPI_FAILURE(status)) |
| 886 | return -ENODEV; |
| 887 | acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); |
| 888 | acpi_enable_gpe(NULL, ec->gpe); |
| 889 | status = acpi_install_address_space_handler(ec->handle, |
| 890 | ACPI_ADR_SPACE_EC, |
| 891 | &acpi_ec_space_handler, |
| 892 | NULL, ec); |
| 893 | if (ACPI_FAILURE(status)) { |
| 894 | if (status == AE_NOT_FOUND) { |
| 895 | /* |
| 896 | * Maybe OS fails in evaluating the _REG object. |
| 897 | * The AE_NOT_FOUND error will be ignored and OS |
| 898 | * continue to initialize EC. |
| 899 | */ |
| 900 | printk(KERN_ERR "Fail in evaluating the _REG object" |
| 901 | " of EC device. Broken bios is suspected.\n"); |
| 902 | } else { |
| 903 | acpi_remove_gpe_handler(NULL, ec->gpe, |
| 904 | &acpi_ec_gpe_handler); |
| 905 | return -ENODEV; |
| 906 | } |
| 907 | } |
| 908 | |
| 909 | set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
| 910 | return 0; |
| 911 | } |
| 912 | |
| 913 | static int acpi_ec_start(struct acpi_device *device) |
| 914 | { |
| 915 | struct acpi_ec *ec; |
| 916 | int ret = 0; |
| 917 | |
| 918 | if (!device) |
| 919 | return -EINVAL; |
| 920 | |
| 921 | ec = acpi_driver_data(device); |
| 922 | |
| 923 | if (!ec) |
| 924 | return -EINVAL; |
| 925 | |
| 926 | ret = ec_install_handlers(ec); |
| 927 | |
| 928 | /* EC is fully operational, allow queries */ |
| 929 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
| 930 | return ret; |
| 931 | } |
| 932 | |
| 933 | static int acpi_ec_stop(struct acpi_device *device, int type) |
| 934 | { |
| 935 | struct acpi_ec *ec; |
| 936 | if (!device) |
| 937 | return -EINVAL; |
| 938 | ec = acpi_driver_data(device); |
| 939 | if (!ec) |
| 940 | return -EINVAL; |
| 941 | ec_remove_handlers(ec); |
| 942 | |
| 943 | return 0; |
| 944 | } |
| 945 | |
| 946 | int __init acpi_boot_ec_enable(void) |
| 947 | { |
| 948 | if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags)) |
| 949 | return 0; |
| 950 | if (!ec_install_handlers(boot_ec)) { |
| 951 | first_ec = boot_ec; |
| 952 | return 0; |
| 953 | } |
| 954 | return -EFAULT; |
| 955 | } |
| 956 | |
| 957 | static const struct acpi_device_id ec_device_ids[] = { |
| 958 | {"PNP0C09", 0}, |
| 959 | {"", 0}, |
| 960 | }; |
| 961 | |
| 962 | int __init acpi_ec_ecdt_probe(void) |
| 963 | { |
| 964 | acpi_status status; |
| 965 | struct acpi_ec *saved_ec = NULL; |
| 966 | struct acpi_table_ecdt *ecdt_ptr; |
| 967 | |
| 968 | boot_ec = make_acpi_ec(); |
| 969 | if (!boot_ec) |
| 970 | return -ENOMEM; |
| 971 | /* |
| 972 | * Generate a boot ec context |
| 973 | */ |
| 974 | if (dmi_name_in_vendors("Micro-Star") || |
| 975 | dmi_name_in_vendors("Notebook")) { |
| 976 | pr_info(PREFIX "Enabling special treatment for EC from MSI.\n"); |
| 977 | EC_FLAGS_MSI = 1; |
| 978 | } |
| 979 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
| 980 | (struct acpi_table_header **)&ecdt_ptr); |
| 981 | if (ACPI_SUCCESS(status)) { |
| 982 | pr_info(PREFIX "EC description table is found, configuring boot EC\n"); |
| 983 | boot_ec->command_addr = ecdt_ptr->control.address; |
| 984 | boot_ec->data_addr = ecdt_ptr->data.address; |
| 985 | boot_ec->gpe = ecdt_ptr->gpe; |
| 986 | boot_ec->handle = ACPI_ROOT_OBJECT; |
| 987 | acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle); |
| 988 | /* Don't trust ECDT, which comes from ASUSTek */ |
| 989 | if (!dmi_name_in_vendors("ASUS")) |
| 990 | goto install; |
| 991 | saved_ec = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
| 992 | if (!saved_ec) |
| 993 | return -ENOMEM; |
| 994 | memcpy(saved_ec, boot_ec, sizeof(*saved_ec)); |
| 995 | /* fall through */ |
| 996 | } |
| 997 | /* This workaround is needed only on some broken machines, |
| 998 | * which require early EC, but fail to provide ECDT */ |
| 999 | printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n"); |
| 1000 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, |
| 1001 | boot_ec, NULL); |
| 1002 | /* Check that acpi_get_devices actually find something */ |
| 1003 | if (ACPI_FAILURE(status) || !boot_ec->handle) |
| 1004 | goto error; |
| 1005 | if (saved_ec) { |
| 1006 | /* try to find good ECDT from ASUSTek */ |
| 1007 | if (saved_ec->command_addr != boot_ec->command_addr || |
| 1008 | saved_ec->data_addr != boot_ec->data_addr || |
| 1009 | saved_ec->gpe != boot_ec->gpe || |
| 1010 | saved_ec->handle != boot_ec->handle) |
| 1011 | pr_info(PREFIX "ASUSTek keeps feeding us with broken " |
| 1012 | "ECDT tables, which are very hard to workaround. " |
| 1013 | "Trying to use DSDT EC info instead. Please send " |
| 1014 | "output of acpidump to linux-acpi@vger.kernel.org\n"); |
| 1015 | kfree(saved_ec); |
| 1016 | saved_ec = NULL; |
| 1017 | } else { |
| 1018 | /* We really need to limit this workaround, the only ASUS, |
| 1019 | * which needs it, has fake EC._INI method, so use it as flag. |
| 1020 | * Keep boot_ec struct as it will be needed soon. |
| 1021 | */ |
| 1022 | acpi_handle dummy; |
| 1023 | if (!dmi_name_in_vendors("ASUS") || |
| 1024 | ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", |
| 1025 | &dummy))) |
| 1026 | return -ENODEV; |
| 1027 | } |
| 1028 | install: |
| 1029 | if (!ec_install_handlers(boot_ec)) { |
| 1030 | first_ec = boot_ec; |
| 1031 | return 0; |
| 1032 | } |
| 1033 | error: |
| 1034 | kfree(boot_ec); |
| 1035 | boot_ec = NULL; |
| 1036 | return -ENODEV; |
| 1037 | } |
| 1038 | |
| 1039 | static int acpi_ec_suspend(struct acpi_device *device, pm_message_t state) |
| 1040 | { |
| 1041 | struct acpi_ec *ec = acpi_driver_data(device); |
| 1042 | /* Stop using GPE */ |
| 1043 | set_bit(EC_FLAGS_NO_GPE, &ec->flags); |
| 1044 | clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); |
| 1045 | acpi_disable_gpe(NULL, ec->gpe); |
| 1046 | return 0; |
| 1047 | } |
| 1048 | |
| 1049 | static int acpi_ec_resume(struct acpi_device *device) |
| 1050 | { |
| 1051 | struct acpi_ec *ec = acpi_driver_data(device); |
| 1052 | /* Enable use of GPE back */ |
| 1053 | clear_bit(EC_FLAGS_NO_GPE, &ec->flags); |
| 1054 | acpi_enable_gpe(NULL, ec->gpe); |
| 1055 | return 0; |
| 1056 | } |
| 1057 | |
| 1058 | static struct acpi_driver acpi_ec_driver = { |
| 1059 | .name = "ec", |
| 1060 | .class = ACPI_EC_CLASS, |
| 1061 | .ids = ec_device_ids, |
| 1062 | .ops = { |
| 1063 | .add = acpi_ec_add, |
| 1064 | .remove = acpi_ec_remove, |
| 1065 | .start = acpi_ec_start, |
| 1066 | .stop = acpi_ec_stop, |
| 1067 | .suspend = acpi_ec_suspend, |
| 1068 | .resume = acpi_ec_resume, |
| 1069 | }, |
| 1070 | }; |
| 1071 | |
| 1072 | static int __init acpi_ec_init(void) |
| 1073 | { |
| 1074 | int result = 0; |
| 1075 | |
| 1076 | if (acpi_disabled) |
| 1077 | return 0; |
| 1078 | |
| 1079 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); |
| 1080 | if (!acpi_ec_dir) |
| 1081 | return -ENODEV; |
| 1082 | |
| 1083 | /* Now register the driver for the EC */ |
| 1084 | result = acpi_bus_register_driver(&acpi_ec_driver); |
| 1085 | if (result < 0) { |
| 1086 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); |
| 1087 | return -ENODEV; |
| 1088 | } |
| 1089 | |
| 1090 | return result; |
| 1091 | } |
| 1092 | |
| 1093 | subsys_initcall(acpi_ec_init); |
| 1094 | |
| 1095 | /* EC driver currently not unloadable */ |
| 1096 | #if 0 |
| 1097 | static void __exit acpi_ec_exit(void) |
| 1098 | { |
| 1099 | |
| 1100 | acpi_bus_unregister_driver(&acpi_ec_driver); |
| 1101 | |
| 1102 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); |
| 1103 | |
| 1104 | return; |
| 1105 | } |
| 1106 | #endif /* 0 */ |