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Commit | Line | Data |
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1da177e4 | 1 | /* |
7c6db4e0 | 2 | * ec.c - ACPI Embedded Controller Driver (v2.1) |
1da177e4 | 3 | * |
7c6db4e0 | 4 | * Copyright (C) 2006-2008 Alexey Starikovskiy <astarikovskiy@suse.de> |
01f22462 | 5 | * Copyright (C) 2006 Denis Sadykov <denis.m.sadykov@intel.com> |
1da177e4 LT |
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 | ||
7c6db4e0 | 29 | /* Uncomment next line to get verbose printout */ |
d772b3b3 | 30 | /* #define DEBUG */ |
16a26e85 | 31 | #define pr_fmt(fmt) "ACPI : EC: " fmt |
d772b3b3 | 32 | |
1da177e4 LT |
33 | #include <linux/kernel.h> |
34 | #include <linux/module.h> | |
35 | #include <linux/init.h> | |
36 | #include <linux/types.h> | |
37 | #include <linux/delay.h> | |
451566f4 | 38 | #include <linux/interrupt.h> |
837012ed | 39 | #include <linux/list.h> |
7c6db4e0 | 40 | #include <linux/spinlock.h> |
5a0e3ad6 | 41 | #include <linux/slab.h> |
8b48463f | 42 | #include <linux/acpi.h> |
eb27cae8 | 43 | #include <linux/dmi.h> |
8b48463f | 44 | #include <asm/io.h> |
1da177e4 | 45 | |
1195a098 TR |
46 | #include "internal.h" |
47 | ||
1da177e4 | 48 | #define ACPI_EC_CLASS "embedded_controller" |
1da177e4 LT |
49 | #define ACPI_EC_DEVICE_NAME "Embedded Controller" |
50 | #define ACPI_EC_FILE_INFO "info" | |
837012ed | 51 | |
703959d4 | 52 | /* EC status register */ |
1da177e4 LT |
53 | #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */ |
54 | #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */ | |
451566f4 | 55 | #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */ |
1da177e4 | 56 | #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */ |
4350933a | 57 | |
703959d4 | 58 | /* EC commands */ |
3261ff4d | 59 | enum ec_command { |
6ccedb10 AS |
60 | ACPI_EC_COMMAND_READ = 0x80, |
61 | ACPI_EC_COMMAND_WRITE = 0x81, | |
62 | ACPI_EC_BURST_ENABLE = 0x82, | |
63 | ACPI_EC_BURST_DISABLE = 0x83, | |
64 | ACPI_EC_COMMAND_QUERY = 0x84, | |
3261ff4d | 65 | }; |
837012ed | 66 | |
5c406412 | 67 | #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */ |
703959d4 | 68 | #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ |
2a84cb98 | 69 | #define ACPI_EC_MSI_UDELAY 550 /* Wait 550us for MSI EC */ |
ad332c8a KC |
70 | #define ACPI_EC_CLEAR_MAX 100 /* Maximum number of events to query |
71 | * when trying to clear the EC */ | |
703959d4 | 72 | |
080e412c | 73 | enum { |
080e412c | 74 | EC_FLAGS_QUERY_PENDING, /* Query is pending */ |
7c6db4e0 | 75 | EC_FLAGS_GPE_STORM, /* GPE storm detected */ |
f6bb13aa | 76 | EC_FLAGS_HANDLERS_INSTALLED, /* Handlers for GPE and |
7c6db4e0 | 77 | * OpReg are installed */ |
fe955682 | 78 | EC_FLAGS_BLOCKED, /* Transactions are blocked */ |
1da177e4 | 79 | }; |
6ffb221a | 80 | |
f92fca00 LZ |
81 | #define ACPI_EC_COMMAND_POLL 0x01 /* Available for command byte */ |
82 | #define ACPI_EC_COMMAND_COMPLETE 0x02 /* Completed last byte */ | |
83 | ||
7a18e96d TR |
84 | /* ec.c is compiled in acpi namespace so this shows up as acpi.ec_delay param */ |
85 | static unsigned int ec_delay __read_mostly = ACPI_EC_DELAY; | |
86 | module_param(ec_delay, uint, 0644); | |
87 | MODULE_PARM_DESC(ec_delay, "Timeout(ms) waited until an EC command completes"); | |
88 | ||
a520d52e FT |
89 | /* |
90 | * If the number of false interrupts per one transaction exceeds | |
91 | * this threshold, will think there is a GPE storm happened and | |
92 | * will disable the GPE for normal transaction. | |
93 | */ | |
94 | static unsigned int ec_storm_threshold __read_mostly = 8; | |
95 | module_param(ec_storm_threshold, uint, 0644); | |
96 | MODULE_PARM_DESC(ec_storm_threshold, "Maxim false GPE numbers not considered as GPE storm"); | |
97 | ||
837012ed AS |
98 | struct acpi_ec_query_handler { |
99 | struct list_head node; | |
100 | acpi_ec_query_func func; | |
101 | acpi_handle handle; | |
102 | void *data; | |
103 | u8 query_bit; | |
104 | }; | |
105 | ||
8463200a | 106 | struct transaction { |
7c6db4e0 AS |
107 | const u8 *wdata; |
108 | u8 *rdata; | |
109 | unsigned short irq_count; | |
8463200a | 110 | u8 command; |
a2f93aea AS |
111 | u8 wi; |
112 | u8 ri; | |
7c6db4e0 AS |
113 | u8 wlen; |
114 | u8 rlen; | |
f92fca00 | 115 | u8 flags; |
7c6db4e0 AS |
116 | }; |
117 | ||
1195a098 TR |
118 | struct acpi_ec *boot_ec, *first_ec; |
119 | EXPORT_SYMBOL(first_ec); | |
703959d4 | 120 | |
5423a0cb | 121 | static int EC_FLAGS_MSI; /* Out-of-spec MSI controller */ |
0adf3c74 | 122 | static int EC_FLAGS_VALIDATE_ECDT; /* ASUStec ECDTs need to be validated */ |
478fa03b | 123 | static int EC_FLAGS_SKIP_DSDT_SCAN; /* Not all BIOS survive early DSDT scan */ |
ad332c8a | 124 | static int EC_FLAGS_CLEAR_ON_RESUME; /* Needs acpi_ec_clear() on boot/resume */ |
5423a0cb | 125 | |
1da177e4 LT |
126 | /* -------------------------------------------------------------------------- |
127 | Transaction Management | |
128 | -------------------------------------------------------------------------- */ | |
129 | ||
6ffb221a | 130 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 131 | { |
3ebe08a7 | 132 | u8 x = inb(ec->command_addr); |
16a26e85 | 133 | pr_debug("---> status = 0x%2.2x\n", x); |
3ebe08a7 | 134 | return x; |
451566f4 DT |
135 | } |
136 | ||
6ffb221a | 137 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 138 | { |
3ebe08a7 | 139 | u8 x = inb(ec->data_addr); |
16a26e85 | 140 | pr_debug("---> data = 0x%2.2x\n", x); |
7c6db4e0 | 141 | return x; |
7c6db5e5 DS |
142 | } |
143 | ||
6ffb221a | 144 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 145 | { |
16a26e85 | 146 | pr_debug("<--- command = 0x%2.2x\n", command); |
6ffb221a | 147 | outb(command, ec->command_addr); |
45bea155 LY |
148 | } |
149 | ||
6ffb221a | 150 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 151 | { |
16a26e85 | 152 | pr_debug("<--- data = 0x%2.2x\n", data); |
6ffb221a | 153 | outb(data, ec->data_addr); |
703959d4 | 154 | } |
45bea155 | 155 | |
f92fca00 | 156 | static int ec_transaction_completed(struct acpi_ec *ec) |
6ffb221a | 157 | { |
7c6db4e0 AS |
158 | unsigned long flags; |
159 | int ret = 0; | |
f351d027 | 160 | spin_lock_irqsave(&ec->lock, flags); |
f92fca00 | 161 | if (!ec->curr || (ec->curr->flags & ACPI_EC_COMMAND_COMPLETE)) |
7c6db4e0 | 162 | ret = 1; |
f351d027 | 163 | spin_unlock_irqrestore(&ec->lock, flags); |
7c6db4e0 | 164 | return ret; |
45bea155 | 165 | } |
451566f4 | 166 | |
66b42b78 | 167 | static void advance_transaction(struct acpi_ec *ec) |
7c6db5e5 | 168 | { |
36b15875 | 169 | struct transaction *t; |
66b42b78 | 170 | u8 status; |
b76b51ba | 171 | |
66b42b78 LZ |
172 | pr_debug("===== %s =====\n", in_interrupt() ? "IRQ" : "TASK"); |
173 | status = acpi_ec_read_status(ec); | |
36b15875 | 174 | t = ec->curr; |
b76b51ba | 175 | if (!t) |
f92fca00 LZ |
176 | goto err; |
177 | if (t->flags & ACPI_EC_COMMAND_POLL) { | |
178 | if (t->wlen > t->wi) { | |
179 | if ((status & ACPI_EC_FLAG_IBF) == 0) | |
180 | acpi_ec_write_data(ec, t->wdata[t->wi++]); | |
181 | else | |
182 | goto err; | |
183 | } else if (t->rlen > t->ri) { | |
184 | if ((status & ACPI_EC_FLAG_OBF) == 1) { | |
185 | t->rdata[t->ri++] = acpi_ec_read_data(ec); | |
186 | if (t->rlen == t->ri) | |
187 | t->flags |= ACPI_EC_COMMAND_COMPLETE; | |
188 | } else | |
189 | goto err; | |
190 | } else if (t->wlen == t->wi && | |
191 | (status & ACPI_EC_FLAG_IBF) == 0) | |
192 | t->flags |= ACPI_EC_COMMAND_COMPLETE; | |
193 | return; | |
194 | } else { | |
195 | if ((status & ACPI_EC_FLAG_IBF) == 0) { | |
196 | acpi_ec_write_cmd(ec, t->command); | |
197 | t->flags |= ACPI_EC_COMMAND_POLL; | |
7c6db4e0 | 198 | } else |
dd15f8c4 | 199 | goto err; |
f92fca00 LZ |
200 | return; |
201 | } | |
dd15f8c4 | 202 | err: |
a3cd8d27 FT |
203 | /* |
204 | * If SCI bit is set, then don't think it's a false IRQ | |
205 | * otherwise will take a not handled IRQ as a false one. | |
206 | */ | |
f92fca00 LZ |
207 | if (!(status & ACPI_EC_FLAG_SCI)) { |
208 | if (in_interrupt() && t) | |
209 | ++t->irq_count; | |
210 | } | |
211 | } | |
a3cd8d27 | 212 | |
f92fca00 LZ |
213 | static void start_transaction(struct acpi_ec *ec) |
214 | { | |
215 | ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0; | |
216 | ec->curr->flags = 0; | |
217 | advance_transaction(ec); | |
845625cd | 218 | } |
03d1d99c | 219 | |
3eba563e | 220 | static int acpi_ec_sync_query(struct acpi_ec *ec, u8 *data); |
7c6db4e0 | 221 | |
a62e8f19 | 222 | static int ec_check_sci_sync(struct acpi_ec *ec, u8 state) |
7c6db5e5 | 223 | { |
7c6db4e0 AS |
224 | if (state & ACPI_EC_FLAG_SCI) { |
225 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) | |
3eba563e | 226 | return acpi_ec_sync_query(ec, NULL); |
7c6db4e0 AS |
227 | } |
228 | return 0; | |
229 | } | |
230 | ||
231 | static int ec_poll(struct acpi_ec *ec) | |
232 | { | |
2a84cb98 | 233 | unsigned long flags; |
28fe5c82 | 234 | int repeat = 5; /* number of command restarts */ |
2a84cb98 AS |
235 | while (repeat--) { |
236 | unsigned long delay = jiffies + | |
7a18e96d | 237 | msecs_to_jiffies(ec_delay); |
2a84cb98 AS |
238 | do { |
239 | /* don't sleep with disabled interrupts */ | |
240 | if (EC_FLAGS_MSI || irqs_disabled()) { | |
241 | udelay(ACPI_EC_MSI_UDELAY); | |
f92fca00 | 242 | if (ec_transaction_completed(ec)) |
2a84cb98 AS |
243 | return 0; |
244 | } else { | |
245 | if (wait_event_timeout(ec->wait, | |
f92fca00 | 246 | ec_transaction_completed(ec), |
2a84cb98 AS |
247 | msecs_to_jiffies(1))) |
248 | return 0; | |
249 | } | |
f92fca00 | 250 | spin_lock_irqsave(&ec->lock, flags); |
66b42b78 | 251 | advance_transaction(ec); |
f92fca00 | 252 | spin_unlock_irqrestore(&ec->lock, flags); |
2a84cb98 | 253 | } while (time_before(jiffies, delay)); |
16a26e85 | 254 | pr_debug("controller reset, restart transaction\n"); |
f351d027 | 255 | spin_lock_irqsave(&ec->lock, flags); |
2a84cb98 | 256 | start_transaction(ec); |
f351d027 | 257 | spin_unlock_irqrestore(&ec->lock, flags); |
af3fd140 | 258 | } |
b77d81b2 | 259 | return -ETIME; |
1da177e4 LT |
260 | } |
261 | ||
8463200a | 262 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
2a84cb98 | 263 | struct transaction *t) |
45bea155 | 264 | { |
7c6db4e0 | 265 | unsigned long tmp; |
7c6db4e0 | 266 | int ret = 0; |
5423a0cb | 267 | if (EC_FLAGS_MSI) |
2a84cb98 | 268 | udelay(ACPI_EC_MSI_UDELAY); |
7c6db4e0 | 269 | /* start transaction */ |
f351d027 | 270 | spin_lock_irqsave(&ec->lock, tmp); |
7c6db4e0 | 271 | /* following two actions should be kept atomic */ |
8463200a | 272 | ec->curr = t; |
a2f93aea | 273 | start_transaction(ec); |
8463200a | 274 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) |
080e412c | 275 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
f351d027 | 276 | spin_unlock_irqrestore(&ec->lock, tmp); |
2a84cb98 | 277 | ret = ec_poll(ec); |
f351d027 | 278 | spin_lock_irqsave(&ec->lock, tmp); |
8463200a | 279 | ec->curr = NULL; |
f351d027 | 280 | spin_unlock_irqrestore(&ec->lock, tmp); |
7c6db4e0 AS |
281 | return ret; |
282 | } | |
283 | ||
2a84cb98 | 284 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) |
1da177e4 | 285 | { |
d7a76e4c | 286 | int status; |
50526df6 | 287 | u32 glk; |
8463200a | 288 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
d550d98d | 289 | return -EINVAL; |
8463200a AS |
290 | if (t->rdata) |
291 | memset(t->rdata, 0, t->rlen); | |
f351d027 | 292 | mutex_lock(&ec->mutex); |
fe955682 | 293 | if (test_bit(EC_FLAGS_BLOCKED, &ec->flags)) { |
f6bb13aa RW |
294 | status = -EINVAL; |
295 | goto unlock; | |
296 | } | |
703959d4 | 297 | if (ec->global_lock) { |
1da177e4 | 298 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 299 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
300 | status = -ENODEV; |
301 | goto unlock; | |
c24e912b | 302 | } |
1da177e4 | 303 | } |
16a26e85 | 304 | pr_debug("transaction start (cmd=0x%02x, addr=0x%02x)\n", |
b76b51ba | 305 | t->command, t->wdata ? t->wdata[0] : 0); |
a62e8f19 AS |
306 | /* disable GPE during transaction if storm is detected */ |
307 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
3784730b RW |
308 | /* It has to be disabled, so that it doesn't trigger. */ |
309 | acpi_disable_gpe(NULL, ec->gpe); | |
a62e8f19 AS |
310 | } |
311 | ||
2a84cb98 | 312 | status = acpi_ec_transaction_unlocked(ec, t); |
a62e8f19 AS |
313 | |
314 | /* check if we received SCI during transaction */ | |
315 | ec_check_sci_sync(ec, acpi_ec_read_status(ec)); | |
316 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
54070101 | 317 | msleep(1); |
3784730b RW |
318 | /* It is safe to enable the GPE outside of the transaction. */ |
319 | acpi_enable_gpe(NULL, ec->gpe); | |
a520d52e | 320 | } else if (t->irq_count > ec_storm_threshold) { |
16a26e85 | 321 | pr_info("GPE storm detected(%d GPEs), " |
b76b51ba FT |
322 | "transactions will use polling mode\n", |
323 | t->irq_count); | |
a62e8f19 AS |
324 | set_bit(EC_FLAGS_GPE_STORM, &ec->flags); |
325 | } | |
16a26e85 | 326 | pr_debug("transaction end\n"); |
703959d4 | 327 | if (ec->global_lock) |
1da177e4 | 328 | acpi_release_global_lock(glk); |
7c6db4e0 | 329 | unlock: |
f351d027 | 330 | mutex_unlock(&ec->mutex); |
d550d98d | 331 | return status; |
1da177e4 LT |
332 | } |
333 | ||
8a383ef0 | 334 | static int acpi_ec_burst_enable(struct acpi_ec *ec) |
c45aac43 AS |
335 | { |
336 | u8 d; | |
8463200a AS |
337 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
338 | .wdata = NULL, .rdata = &d, | |
339 | .wlen = 0, .rlen = 1}; | |
340 | ||
2a84cb98 | 341 | return acpi_ec_transaction(ec, &t); |
c45aac43 AS |
342 | } |
343 | ||
8a383ef0 | 344 | static int acpi_ec_burst_disable(struct acpi_ec *ec) |
c45aac43 | 345 | { |
8463200a AS |
346 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
347 | .wdata = NULL, .rdata = NULL, | |
348 | .wlen = 0, .rlen = 0}; | |
349 | ||
7c6db4e0 | 350 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
2a84cb98 | 351 | acpi_ec_transaction(ec, &t) : 0; |
c45aac43 AS |
352 | } |
353 | ||
6ccedb10 | 354 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) |
3576cf61 DS |
355 | { |
356 | int result; | |
357 | u8 d; | |
8463200a AS |
358 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
359 | .wdata = &address, .rdata = &d, | |
360 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 361 | |
2a84cb98 | 362 | result = acpi_ec_transaction(ec, &t); |
3576cf61 DS |
363 | *data = d; |
364 | return result; | |
365 | } | |
6ffb221a | 366 | |
3576cf61 DS |
367 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
368 | { | |
6ccedb10 | 369 | u8 wdata[2] = { address, data }; |
8463200a AS |
370 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
371 | .wdata = wdata, .rdata = NULL, | |
372 | .wlen = 2, .rlen = 0}; | |
373 | ||
2a84cb98 | 374 | return acpi_ec_transaction(ec, &t); |
3576cf61 DS |
375 | } |
376 | ||
b76b51ba | 377 | int ec_read(u8 addr, u8 *val) |
1da177e4 | 378 | { |
1da177e4 | 379 | int err; |
6ffb221a | 380 | u8 temp_data; |
1da177e4 LT |
381 | |
382 | if (!first_ec) | |
383 | return -ENODEV; | |
384 | ||
d033879c | 385 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
386 | |
387 | if (!err) { | |
388 | *val = temp_data; | |
389 | return 0; | |
50526df6 | 390 | } else |
1da177e4 LT |
391 | return err; |
392 | } | |
50526df6 | 393 | |
1da177e4 LT |
394 | EXPORT_SYMBOL(ec_read); |
395 | ||
50526df6 | 396 | int ec_write(u8 addr, u8 val) |
1da177e4 | 397 | { |
1da177e4 LT |
398 | int err; |
399 | ||
400 | if (!first_ec) | |
401 | return -ENODEV; | |
402 | ||
d033879c | 403 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
404 | |
405 | return err; | |
406 | } | |
50526df6 | 407 | |
1da177e4 LT |
408 | EXPORT_SYMBOL(ec_write); |
409 | ||
616362de | 410 | int ec_transaction(u8 command, |
9e197219 | 411 | const u8 * wdata, unsigned wdata_len, |
1cb7b1e0 | 412 | u8 * rdata, unsigned rdata_len) |
45bea155 | 413 | { |
8463200a AS |
414 | struct transaction t = {.command = command, |
415 | .wdata = wdata, .rdata = rdata, | |
416 | .wlen = wdata_len, .rlen = rdata_len}; | |
d7a76e4c LP |
417 | if (!first_ec) |
418 | return -ENODEV; | |
45bea155 | 419 | |
2a84cb98 | 420 | return acpi_ec_transaction(first_ec, &t); |
45bea155 | 421 | } |
1da177e4 | 422 | |
ab9e43c6 LP |
423 | EXPORT_SYMBOL(ec_transaction); |
424 | ||
3e2abc5a SF |
425 | /* Get the handle to the EC device */ |
426 | acpi_handle ec_get_handle(void) | |
427 | { | |
428 | if (!first_ec) | |
429 | return NULL; | |
430 | return first_ec->handle; | |
431 | } | |
432 | ||
433 | EXPORT_SYMBOL(ec_get_handle); | |
434 | ||
ad332c8a | 435 | /* |
3eba563e | 436 | * Process _Q events that might have accumulated in the EC. |
ad332c8a KC |
437 | * Run with locked ec mutex. |
438 | */ | |
439 | static void acpi_ec_clear(struct acpi_ec *ec) | |
440 | { | |
441 | int i, status; | |
442 | u8 value = 0; | |
443 | ||
444 | for (i = 0; i < ACPI_EC_CLEAR_MAX; i++) { | |
3eba563e | 445 | status = acpi_ec_sync_query(ec, &value); |
ad332c8a KC |
446 | if (status || !value) |
447 | break; | |
448 | } | |
449 | ||
450 | if (unlikely(i == ACPI_EC_CLEAR_MAX)) | |
451 | pr_warn("Warning: Maximum of %d stale EC events cleared\n", i); | |
452 | else | |
453 | pr_info("%d stale EC events cleared\n", i); | |
454 | } | |
455 | ||
fe955682 | 456 | void acpi_ec_block_transactions(void) |
f6bb13aa RW |
457 | { |
458 | struct acpi_ec *ec = first_ec; | |
459 | ||
460 | if (!ec) | |
461 | return; | |
462 | ||
f351d027 | 463 | mutex_lock(&ec->mutex); |
f6bb13aa | 464 | /* Prevent transactions from being carried out */ |
fe955682 | 465 | set_bit(EC_FLAGS_BLOCKED, &ec->flags); |
f351d027 | 466 | mutex_unlock(&ec->mutex); |
f6bb13aa RW |
467 | } |
468 | ||
fe955682 | 469 | void acpi_ec_unblock_transactions(void) |
f6bb13aa RW |
470 | { |
471 | struct acpi_ec *ec = first_ec; | |
472 | ||
473 | if (!ec) | |
474 | return; | |
475 | ||
f351d027 | 476 | mutex_lock(&ec->mutex); |
f6bb13aa | 477 | /* Allow transactions to be carried out again */ |
fe955682 | 478 | clear_bit(EC_FLAGS_BLOCKED, &ec->flags); |
ad332c8a KC |
479 | |
480 | if (EC_FLAGS_CLEAR_ON_RESUME) | |
481 | acpi_ec_clear(ec); | |
482 | ||
f351d027 | 483 | mutex_unlock(&ec->mutex); |
f6bb13aa RW |
484 | } |
485 | ||
fe955682 | 486 | void acpi_ec_unblock_transactions_early(void) |
d5a64513 RW |
487 | { |
488 | /* | |
489 | * Allow transactions to happen again (this function is called from | |
490 | * atomic context during wakeup, so we don't need to acquire the mutex). | |
491 | */ | |
492 | if (first_ec) | |
fe955682 | 493 | clear_bit(EC_FLAGS_BLOCKED, &first_ec->flags); |
d5a64513 RW |
494 | } |
495 | ||
a62e8f19 | 496 | static int acpi_ec_query_unlocked(struct acpi_ec *ec, u8 * data) |
3576cf61 DS |
497 | { |
498 | int result; | |
6ccedb10 | 499 | u8 d; |
8463200a AS |
500 | struct transaction t = {.command = ACPI_EC_COMMAND_QUERY, |
501 | .wdata = NULL, .rdata = &d, | |
502 | .wlen = 0, .rlen = 1}; | |
6ccedb10 AS |
503 | if (!ec || !data) |
504 | return -EINVAL; | |
6ccedb10 AS |
505 | /* |
506 | * Query the EC to find out which _Qxx method we need to evaluate. | |
507 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
508 | * bit to be cleared (and thus clearing the interrupt source). | |
509 | */ | |
a62e8f19 | 510 | result = acpi_ec_transaction_unlocked(ec, &t); |
6ccedb10 AS |
511 | if (result) |
512 | return result; | |
6ccedb10 AS |
513 | if (!d) |
514 | return -ENODATA; | |
6ccedb10 AS |
515 | *data = d; |
516 | return 0; | |
1da177e4 LT |
517 | } |
518 | ||
1da177e4 LT |
519 | /* -------------------------------------------------------------------------- |
520 | Event Management | |
521 | -------------------------------------------------------------------------- */ | |
837012ed AS |
522 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
523 | acpi_handle handle, acpi_ec_query_func func, | |
524 | void *data) | |
525 | { | |
526 | struct acpi_ec_query_handler *handler = | |
527 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
528 | if (!handler) | |
529 | return -ENOMEM; | |
530 | ||
531 | handler->query_bit = query_bit; | |
532 | handler->handle = handle; | |
533 | handler->func = func; | |
534 | handler->data = data; | |
f351d027 | 535 | mutex_lock(&ec->mutex); |
30c08574 | 536 | list_add(&handler->node, &ec->list); |
f351d027 | 537 | mutex_unlock(&ec->mutex); |
837012ed AS |
538 | return 0; |
539 | } | |
540 | ||
541 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); | |
542 | ||
543 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
544 | { | |
1544fdbc | 545 | struct acpi_ec_query_handler *handler, *tmp; |
f351d027 | 546 | mutex_lock(&ec->mutex); |
1544fdbc | 547 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
548 | if (query_bit == handler->query_bit) { |
549 | list_del(&handler->node); | |
550 | kfree(handler); | |
837012ed AS |
551 | } |
552 | } | |
f351d027 | 553 | mutex_unlock(&ec->mutex); |
837012ed AS |
554 | } |
555 | ||
556 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); | |
1da177e4 | 557 | |
a62e8f19 | 558 | static void acpi_ec_run(void *cxt) |
45bea155 | 559 | { |
a62e8f19 AS |
560 | struct acpi_ec_query_handler *handler = cxt; |
561 | if (!handler) | |
e41334c0 | 562 | return; |
16a26e85 | 563 | pr_debug("start query execution\n"); |
a62e8f19 AS |
564 | if (handler->func) |
565 | handler->func(handler->data); | |
566 | else if (handler->handle) | |
567 | acpi_evaluate_object(handler->handle, NULL, NULL, NULL); | |
16a26e85 | 568 | pr_debug("stop query execution\n"); |
a62e8f19 AS |
569 | kfree(handler); |
570 | } | |
571 | ||
3eba563e | 572 | static int acpi_ec_sync_query(struct acpi_ec *ec, u8 *data) |
a62e8f19 AS |
573 | { |
574 | u8 value = 0; | |
575 | int status; | |
576 | struct acpi_ec_query_handler *handler, *copy; | |
3eba563e KC |
577 | |
578 | status = acpi_ec_query_unlocked(ec, &value); | |
579 | if (data) | |
580 | *data = value; | |
581 | if (status) | |
a62e8f19 | 582 | return status; |
3eba563e | 583 | |
837012ed AS |
584 | list_for_each_entry(handler, &ec->list, node) { |
585 | if (value == handler->query_bit) { | |
586 | /* have custom handler for this bit */ | |
a62e8f19 AS |
587 | copy = kmalloc(sizeof(*handler), GFP_KERNEL); |
588 | if (!copy) | |
589 | return -ENOMEM; | |
590 | memcpy(copy, handler, sizeof(*copy)); | |
16a26e85 LT |
591 | pr_debug("push query execution (0x%2x) on queue\n", |
592 | value); | |
f5347867 AS |
593 | return acpi_os_execute((copy->func) ? |
594 | OSL_NOTIFY_HANDLER : OSL_GPE_HANDLER, | |
a62e8f19 | 595 | acpi_ec_run, copy); |
837012ed AS |
596 | } |
597 | } | |
a62e8f19 AS |
598 | return 0; |
599 | } | |
600 | ||
601 | static void acpi_ec_gpe_query(void *ec_cxt) | |
602 | { | |
603 | struct acpi_ec *ec = ec_cxt; | |
604 | if (!ec) | |
605 | return; | |
f351d027 | 606 | mutex_lock(&ec->mutex); |
3eba563e | 607 | acpi_ec_sync_query(ec, NULL); |
f351d027 | 608 | mutex_unlock(&ec->mutex); |
45bea155 | 609 | } |
1da177e4 | 610 | |
a62e8f19 AS |
611 | static int ec_check_sci(struct acpi_ec *ec, u8 state) |
612 | { | |
613 | if (state & ACPI_EC_FLAG_SCI) { | |
614 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) { | |
16a26e85 | 615 | pr_debug("push gpe query to the queue\n"); |
a62e8f19 AS |
616 | return acpi_os_execute(OSL_NOTIFY_HANDLER, |
617 | acpi_ec_gpe_query, ec); | |
618 | } | |
619 | } | |
620 | return 0; | |
621 | } | |
622 | ||
8b6cd8ad LM |
623 | static u32 acpi_ec_gpe_handler(acpi_handle gpe_device, |
624 | u32 gpe_number, void *data) | |
1da177e4 | 625 | { |
f92fca00 | 626 | unsigned long flags; |
3d02b90b | 627 | struct acpi_ec *ec = data; |
7c6db4e0 | 628 | |
f92fca00 | 629 | spin_lock_irqsave(&ec->lock, flags); |
66b42b78 | 630 | advance_transaction(ec); |
f92fca00 | 631 | spin_unlock_irqrestore(&ec->lock, flags); |
9b80f0f7 | 632 | if (ec_transaction_completed(ec)) { |
2a84cb98 | 633 | wake_up(&ec->wait); |
a62e8f19 AS |
634 | ec_check_sci(ec, acpi_ec_read_status(ec)); |
635 | } | |
bba63a29 | 636 | return ACPI_INTERRUPT_HANDLED | ACPI_REENABLE_GPE; |
845625cd AS |
637 | } |
638 | ||
1da177e4 LT |
639 | /* -------------------------------------------------------------------------- |
640 | Address Space Management | |
641 | -------------------------------------------------------------------------- */ | |
642 | ||
1da177e4 | 643 | static acpi_status |
5b7734b4 | 644 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
dadf28a1 | 645 | u32 bits, u64 *value64, |
50526df6 | 646 | void *handler_context, void *region_context) |
1da177e4 | 647 | { |
3d02b90b | 648 | struct acpi_ec *ec = handler_context; |
dadf28a1 AS |
649 | int result = 0, i, bytes = bits / 8; |
650 | u8 *value = (u8 *)value64; | |
1da177e4 | 651 | |
1da177e4 | 652 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 653 | return AE_BAD_PARAMETER; |
1da177e4 | 654 | |
5b7734b4 | 655 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 656 | return AE_BAD_PARAMETER; |
1da177e4 | 657 | |
dadf28a1 | 658 | if (EC_FLAGS_MSI || bits > 8) |
6a63b06f | 659 | acpi_ec_burst_enable(ec); |
b3b233c7 | 660 | |
dadf28a1 AS |
661 | for (i = 0; i < bytes; ++i, ++address, ++value) |
662 | result = (function == ACPI_READ) ? | |
663 | acpi_ec_read(ec, address, value) : | |
664 | acpi_ec_write(ec, address, *value); | |
1da177e4 | 665 | |
dadf28a1 | 666 | if (EC_FLAGS_MSI || bits > 8) |
6a63b06f | 667 | acpi_ec_burst_disable(ec); |
b3b233c7 | 668 | |
1da177e4 LT |
669 | switch (result) { |
670 | case -EINVAL: | |
d550d98d | 671 | return AE_BAD_PARAMETER; |
1da177e4 LT |
672 | break; |
673 | case -ENODEV: | |
d550d98d | 674 | return AE_NOT_FOUND; |
1da177e4 LT |
675 | break; |
676 | case -ETIME: | |
d550d98d | 677 | return AE_TIME; |
1da177e4 LT |
678 | break; |
679 | default: | |
d550d98d | 680 | return AE_OK; |
1da177e4 | 681 | } |
1da177e4 LT |
682 | } |
683 | ||
1da177e4 LT |
684 | /* -------------------------------------------------------------------------- |
685 | Driver Interface | |
686 | -------------------------------------------------------------------------- */ | |
c0900c35 AS |
687 | static acpi_status |
688 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
689 | ||
c0900c35 AS |
690 | static struct acpi_ec *make_acpi_ec(void) |
691 | { | |
692 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
693 | if (!ec) | |
694 | return NULL; | |
080e412c | 695 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
f351d027 | 696 | mutex_init(&ec->mutex); |
c0900c35 | 697 | init_waitqueue_head(&ec->wait); |
837012ed | 698 | INIT_LIST_HEAD(&ec->list); |
f351d027 | 699 | spin_lock_init(&ec->lock); |
c0900c35 AS |
700 | return ec; |
701 | } | |
837012ed | 702 | |
c019b193 AS |
703 | static acpi_status |
704 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
705 | void *context, void **return_value) | |
706 | { | |
0175d562 LM |
707 | char node_name[5]; |
708 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
c019b193 AS |
709 | struct acpi_ec *ec = context; |
710 | int value = 0; | |
0175d562 LM |
711 | acpi_status status; |
712 | ||
713 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); | |
714 | ||
715 | if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) { | |
c019b193 AS |
716 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
717 | } | |
718 | return AE_OK; | |
719 | } | |
720 | ||
cd8c93a4 AS |
721 | static acpi_status |
722 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 723 | { |
cd8c93a4 | 724 | acpi_status status; |
d21cf3c1 | 725 | unsigned long long tmp = 0; |
cd8c93a4 AS |
726 | |
727 | struct acpi_ec *ec = context; | |
a5032bfd AS |
728 | |
729 | /* clear addr values, ec_parse_io_ports depend on it */ | |
730 | ec->command_addr = ec->data_addr = 0; | |
731 | ||
cd8c93a4 AS |
732 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
733 | ec_parse_io_ports, ec); | |
734 | if (ACPI_FAILURE(status)) | |
735 | return status; | |
837012ed AS |
736 | |
737 | /* Get GPE bit assignment (EC events). */ | |
738 | /* TODO: Add support for _GPE returning a package */ | |
27663c58 | 739 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
cd8c93a4 AS |
740 | if (ACPI_FAILURE(status)) |
741 | return status; | |
27663c58 | 742 | ec->gpe = tmp; |
837012ed | 743 | /* Use the global lock for all EC transactions? */ |
d21cf3c1 | 744 | tmp = 0; |
27663c58 MW |
745 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
746 | ec->global_lock = tmp; | |
837012ed | 747 | ec->handle = handle; |
cd8c93a4 | 748 | return AE_CTRL_TERMINATE; |
837012ed AS |
749 | } |
750 | ||
5efc5476 BH |
751 | static int ec_install_handlers(struct acpi_ec *ec) |
752 | { | |
753 | acpi_status status; | |
754 | if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) | |
755 | return 0; | |
756 | status = acpi_install_gpe_handler(NULL, ec->gpe, | |
757 | ACPI_GPE_EDGE_TRIGGERED, | |
758 | &acpi_ec_gpe_handler, ec); | |
759 | if (ACPI_FAILURE(status)) | |
760 | return -ENODEV; | |
9630bdd9 | 761 | |
a44061aa | 762 | acpi_enable_gpe(NULL, ec->gpe); |
5efc5476 BH |
763 | status = acpi_install_address_space_handler(ec->handle, |
764 | ACPI_ADR_SPACE_EC, | |
765 | &acpi_ec_space_handler, | |
766 | NULL, ec); | |
767 | if (ACPI_FAILURE(status)) { | |
768 | if (status == AE_NOT_FOUND) { | |
769 | /* | |
770 | * Maybe OS fails in evaluating the _REG object. | |
771 | * The AE_NOT_FOUND error will be ignored and OS | |
772 | * continue to initialize EC. | |
773 | */ | |
16a26e85 | 774 | pr_err("Fail in evaluating the _REG object" |
5efc5476 BH |
775 | " of EC device. Broken bios is suspected.\n"); |
776 | } else { | |
42b946bb | 777 | acpi_disable_gpe(NULL, ec->gpe); |
5efc5476 BH |
778 | acpi_remove_gpe_handler(NULL, ec->gpe, |
779 | &acpi_ec_gpe_handler); | |
780 | return -ENODEV; | |
781 | } | |
782 | } | |
783 | ||
784 | set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); | |
785 | return 0; | |
786 | } | |
787 | ||
4c611060 AS |
788 | static void ec_remove_handlers(struct acpi_ec *ec) |
789 | { | |
a44061aa | 790 | acpi_disable_gpe(NULL, ec->gpe); |
4c611060 AS |
791 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, |
792 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
16a26e85 | 793 | pr_err("failed to remove space handler\n"); |
4c611060 AS |
794 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
795 | &acpi_ec_gpe_handler))) | |
16a26e85 | 796 | pr_err("failed to remove gpe handler\n"); |
7c6db4e0 | 797 | clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
4c611060 AS |
798 | } |
799 | ||
703959d4 | 800 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 801 | { |
703959d4 | 802 | struct acpi_ec *ec = NULL; |
d02be047 | 803 | int ret; |
45bea155 | 804 | |
c0900c35 AS |
805 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
806 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
807 | ||
4c611060 | 808 | /* Check for boot EC */ |
ce52ddf5 AS |
809 | if (boot_ec && |
810 | (boot_ec->handle == device->handle || | |
811 | boot_ec->handle == ACPI_ROOT_OBJECT)) { | |
812 | ec = boot_ec; | |
813 | boot_ec = NULL; | |
814 | } else { | |
815 | ec = make_acpi_ec(); | |
816 | if (!ec) | |
817 | return -ENOMEM; | |
a5032bfd AS |
818 | } |
819 | if (ec_parse_device(device->handle, 0, ec, NULL) != | |
820 | AE_CTRL_TERMINATE) { | |
ce52ddf5 AS |
821 | kfree(ec); |
822 | return -EINVAL; | |
4c611060 AS |
823 | } |
824 | ||
ce52ddf5 AS |
825 | /* Find and register all query methods */ |
826 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
2263576c | 827 | acpi_ec_register_query_methods, NULL, ec, NULL); |
ce52ddf5 | 828 | |
4c611060 AS |
829 | if (!first_ec) |
830 | first_ec = ec; | |
db89b4f0 | 831 | device->driver_data = ec; |
de4f1046 | 832 | |
d6795fe3 AK |
833 | ret = !!request_region(ec->data_addr, 1, "EC data"); |
834 | WARN(!ret, "Could not request EC data io port 0x%lx", ec->data_addr); | |
835 | ret = !!request_region(ec->command_addr, 1, "EC cmd"); | |
836 | WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr); | |
de4f1046 | 837 | |
16a26e85 | 838 | pr_info("GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 839 | ec->gpe, ec->command_addr, ec->data_addr); |
5efc5476 BH |
840 | |
841 | ret = ec_install_handlers(ec); | |
842 | ||
843 | /* EC is fully operational, allow queries */ | |
844 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); | |
ad332c8a KC |
845 | |
846 | /* Clear stale _Q events if hardware might require that */ | |
847 | if (EC_FLAGS_CLEAR_ON_RESUME) { | |
848 | mutex_lock(&ec->mutex); | |
849 | acpi_ec_clear(ec); | |
850 | mutex_unlock(&ec->mutex); | |
851 | } | |
5efc5476 | 852 | return ret; |
1da177e4 LT |
853 | } |
854 | ||
51fac838 | 855 | static int acpi_ec_remove(struct acpi_device *device) |
1da177e4 | 856 | { |
01f22462 | 857 | struct acpi_ec *ec; |
07ddf768 | 858 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 859 | |
1da177e4 | 860 | if (!device) |
d550d98d | 861 | return -EINVAL; |
1da177e4 LT |
862 | |
863 | ec = acpi_driver_data(device); | |
cf745ec7 | 864 | ec_remove_handlers(ec); |
f351d027 | 865 | mutex_lock(&ec->mutex); |
07ddf768 | 866 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
867 | list_del(&handler->node); |
868 | kfree(handler); | |
869 | } | |
f351d027 | 870 | mutex_unlock(&ec->mutex); |
de4f1046 TR |
871 | release_region(ec->data_addr, 1); |
872 | release_region(ec->command_addr, 1); | |
db89b4f0 | 873 | device->driver_data = NULL; |
d033879c | 874 | if (ec == first_ec) |
c0900c35 | 875 | first_ec = NULL; |
4c611060 | 876 | kfree(ec); |
d550d98d | 877 | return 0; |
1da177e4 LT |
878 | } |
879 | ||
1da177e4 | 880 | static acpi_status |
c0900c35 | 881 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 882 | { |
3d02b90b | 883 | struct acpi_ec *ec = context; |
1da177e4 | 884 | |
01f22462 | 885 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 886 | return AE_OK; |
1da177e4 LT |
887 | |
888 | /* | |
889 | * The first address region returned is the data port, and | |
890 | * the second address region returned is the status/command | |
891 | * port. | |
892 | */ | |
de4f1046 | 893 | if (ec->data_addr == 0) |
6ffb221a | 894 | ec->data_addr = resource->data.io.minimum; |
de4f1046 | 895 | else if (ec->command_addr == 0) |
6ffb221a | 896 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 897 | else |
1da177e4 | 898 | return AE_CTRL_TERMINATE; |
1da177e4 | 899 | |
1da177e4 LT |
900 | return AE_OK; |
901 | } | |
902 | ||
c04209a7 AS |
903 | int __init acpi_boot_ec_enable(void) |
904 | { | |
7c6db4e0 | 905 | if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags)) |
c04209a7 AS |
906 | return 0; |
907 | if (!ec_install_handlers(boot_ec)) { | |
908 | first_ec = boot_ec; | |
909 | return 0; | |
910 | } | |
911 | return -EFAULT; | |
912 | } | |
913 | ||
223883b7 AS |
914 | static const struct acpi_device_id ec_device_ids[] = { |
915 | {"PNP0C09", 0}, | |
916 | {"", 0}, | |
917 | }; | |
918 | ||
478fa03b AS |
919 | /* Some BIOS do not survive early DSDT scan, skip it */ |
920 | static int ec_skip_dsdt_scan(const struct dmi_system_id *id) | |
921 | { | |
922 | EC_FLAGS_SKIP_DSDT_SCAN = 1; | |
923 | return 0; | |
924 | } | |
925 | ||
0adf3c74 AS |
926 | /* ASUStek often supplies us with broken ECDT, validate it */ |
927 | static int ec_validate_ecdt(const struct dmi_system_id *id) | |
928 | { | |
929 | EC_FLAGS_VALIDATE_ECDT = 1; | |
930 | return 0; | |
931 | } | |
932 | ||
933 | /* MSI EC needs special treatment, enable it */ | |
934 | static int ec_flag_msi(const struct dmi_system_id *id) | |
935 | { | |
16a26e85 | 936 | pr_debug("Detected MSI hardware, enabling workarounds.\n"); |
0adf3c74 AS |
937 | EC_FLAGS_MSI = 1; |
938 | EC_FLAGS_VALIDATE_ECDT = 1; | |
939 | return 0; | |
940 | } | |
941 | ||
67bfa9b6 FT |
942 | /* |
943 | * Clevo M720 notebook actually works ok with IRQ mode, if we lifted | |
944 | * the GPE storm threshold back to 20 | |
945 | */ | |
946 | static int ec_enlarge_storm_threshold(const struct dmi_system_id *id) | |
947 | { | |
948 | pr_debug("Setting the EC GPE storm threshold to 20\n"); | |
949 | ec_storm_threshold = 20; | |
950 | return 0; | |
951 | } | |
952 | ||
ad332c8a KC |
953 | /* |
954 | * On some hardware it is necessary to clear events accumulated by the EC during | |
955 | * sleep. These ECs stop reporting GPEs until they are manually polled, if too | |
956 | * many events are accumulated. (e.g. Samsung Series 5/9 notebooks) | |
957 | * | |
958 | * https://bugzilla.kernel.org/show_bug.cgi?id=44161 | |
959 | * | |
960 | * Ideally, the EC should also be instructed NOT to accumulate events during | |
961 | * sleep (which Windows seems to do somehow), but the interface to control this | |
962 | * behaviour is not known at this time. | |
963 | * | |
964 | * Models known to be affected are Samsung 530Uxx/535Uxx/540Uxx/550Pxx/900Xxx, | |
965 | * however it is very likely that other Samsung models are affected. | |
966 | * | |
967 | * On systems which don't accumulate _Q events during sleep, this extra check | |
968 | * should be harmless. | |
969 | */ | |
970 | static int ec_clear_on_resume(const struct dmi_system_id *id) | |
971 | { | |
972 | pr_debug("Detected system needing EC poll on resume.\n"); | |
973 | EC_FLAGS_CLEAR_ON_RESUME = 1; | |
974 | return 0; | |
975 | } | |
976 | ||
6cef7497 | 977 | static struct dmi_system_id ec_dmi_table[] __initdata = { |
478fa03b AS |
978 | { |
979 | ec_skip_dsdt_scan, "Compal JFL92", { | |
980 | DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"), | |
981 | DMI_MATCH(DMI_BOARD_NAME, "JFL92") }, NULL}, | |
0adf3c74 AS |
982 | { |
983 | ec_flag_msi, "MSI hardware", { | |
55b313f2 AS |
984 | DMI_MATCH(DMI_BIOS_VENDOR, "Micro-Star")}, NULL}, |
985 | { | |
986 | ec_flag_msi, "MSI hardware", { | |
987 | DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star")}, NULL}, | |
988 | { | |
989 | ec_flag_msi, "MSI hardware", { | |
990 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-Star")}, NULL}, | |
0adf3c74 | 991 | { |
a5dc4f89 AS |
992 | ec_flag_msi, "MSI hardware", { |
993 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-STAR")}, NULL}, | |
994 | { | |
534bc4e3 ZR |
995 | ec_flag_msi, "Quanta hardware", { |
996 | DMI_MATCH(DMI_SYS_VENDOR, "Quanta"), | |
997 | DMI_MATCH(DMI_PRODUCT_NAME, "TW8/SW8/DW8"),}, NULL}, | |
998 | { | |
999 | ec_flag_msi, "Quanta hardware", { | |
1000 | DMI_MATCH(DMI_SYS_VENDOR, "Quanta"), | |
1001 | DMI_MATCH(DMI_PRODUCT_NAME, "TW9/SW9"),}, NULL}, | |
1002 | { | |
0adf3c74 AS |
1003 | ec_validate_ecdt, "ASUS hardware", { |
1004 | DMI_MATCH(DMI_BIOS_VENDOR, "ASUS") }, NULL}, | |
af986d10 PC |
1005 | { |
1006 | ec_validate_ecdt, "ASUS hardware", { | |
1007 | DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc.") }, NULL}, | |
67bfa9b6 FT |
1008 | { |
1009 | ec_enlarge_storm_threshold, "CLEVO hardware", { | |
1010 | DMI_MATCH(DMI_SYS_VENDOR, "CLEVO Co."), | |
1011 | DMI_MATCH(DMI_PRODUCT_NAME, "M720T/M730T"),}, NULL}, | |
eff9a4b6 LT |
1012 | { |
1013 | ec_skip_dsdt_scan, "HP Folio 13", { | |
1014 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), | |
1015 | DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13"),}, NULL}, | |
524f42fa LT |
1016 | { |
1017 | ec_validate_ecdt, "ASUS hardware", { | |
1018 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTek Computer Inc."), | |
1019 | DMI_MATCH(DMI_PRODUCT_NAME, "L4R"),}, NULL}, | |
ad332c8a KC |
1020 | { |
1021 | ec_clear_on_resume, "Samsung hardware", { | |
1022 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD.")}, NULL}, | |
0adf3c74 AS |
1023 | {}, |
1024 | }; | |
1025 | ||
c0900c35 AS |
1026 | int __init acpi_ec_ecdt_probe(void) |
1027 | { | |
c0900c35 | 1028 | acpi_status status; |
c6cb0e87 | 1029 | struct acpi_ec *saved_ec = NULL; |
50526df6 | 1030 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 1031 | |
d66d969d AS |
1032 | boot_ec = make_acpi_ec(); |
1033 | if (!boot_ec) | |
c0900c35 AS |
1034 | return -ENOMEM; |
1035 | /* | |
1036 | * Generate a boot ec context | |
1037 | */ | |
0adf3c74 | 1038 | dmi_check_system(ec_dmi_table); |
15a58ed1 AS |
1039 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
1040 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 1041 | if (ACPI_SUCCESS(status)) { |
16a26e85 | 1042 | pr_info("EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
1043 | boot_ec->command_addr = ecdt_ptr->control.address; |
1044 | boot_ec->data_addr = ecdt_ptr->data.address; | |
1045 | boot_ec->gpe = ecdt_ptr->gpe; | |
4af8e10a | 1046 | boot_ec->handle = ACPI_ROOT_OBJECT; |
ce52ddf5 | 1047 | acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle); |
c6cb0e87 | 1048 | /* Don't trust ECDT, which comes from ASUSTek */ |
0adf3c74 | 1049 | if (!EC_FLAGS_VALIDATE_ECDT) |
c5279dee | 1050 | goto install; |
d6bd535d | 1051 | saved_ec = kmemdup(boot_ec, sizeof(struct acpi_ec), GFP_KERNEL); |
c6cb0e87 AS |
1052 | if (!saved_ec) |
1053 | return -ENOMEM; | |
c5279dee | 1054 | /* fall through */ |
cd8c93a4 | 1055 | } |
0adf3c74 | 1056 | |
478fa03b AS |
1057 | if (EC_FLAGS_SKIP_DSDT_SCAN) |
1058 | return -ENODEV; | |
1059 | ||
c5279dee AS |
1060 | /* This workaround is needed only on some broken machines, |
1061 | * which require early EC, but fail to provide ECDT */ | |
16a26e85 | 1062 | pr_debug("Look up EC in DSDT\n"); |
c5279dee AS |
1063 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, |
1064 | boot_ec, NULL); | |
1065 | /* Check that acpi_get_devices actually find something */ | |
1066 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
1067 | goto error; | |
c6cb0e87 AS |
1068 | if (saved_ec) { |
1069 | /* try to find good ECDT from ASUSTek */ | |
1070 | if (saved_ec->command_addr != boot_ec->command_addr || | |
1071 | saved_ec->data_addr != boot_ec->data_addr || | |
1072 | saved_ec->gpe != boot_ec->gpe || | |
1073 | saved_ec->handle != boot_ec->handle) | |
16a26e85 | 1074 | pr_info("ASUSTek keeps feeding us with broken " |
c6cb0e87 AS |
1075 | "ECDT tables, which are very hard to workaround. " |
1076 | "Trying to use DSDT EC info instead. Please send " | |
1077 | "output of acpidump to linux-acpi@vger.kernel.org\n"); | |
1078 | kfree(saved_ec); | |
1079 | saved_ec = NULL; | |
1080 | } else { | |
1081 | /* We really need to limit this workaround, the only ASUS, | |
1082 | * which needs it, has fake EC._INI method, so use it as flag. | |
1083 | * Keep boot_ec struct as it will be needed soon. | |
1084 | */ | |
c6cb0e87 | 1085 | if (!dmi_name_in_vendors("ASUS") || |
952c63e9 | 1086 | !acpi_has_method(boot_ec->handle, "_INI")) |
c6cb0e87 AS |
1087 | return -ENODEV; |
1088 | } | |
c5279dee AS |
1089 | install: |
1090 | if (!ec_install_handlers(boot_ec)) { | |
d033879c | 1091 | first_ec = boot_ec; |
e8284321 | 1092 | return 0; |
d033879c | 1093 | } |
c5279dee | 1094 | error: |
d66d969d AS |
1095 | kfree(boot_ec); |
1096 | boot_ec = NULL; | |
1da177e4 LT |
1097 | return -ENODEV; |
1098 | } | |
1099 | ||
223883b7 AS |
1100 | static struct acpi_driver acpi_ec_driver = { |
1101 | .name = "ec", | |
1102 | .class = ACPI_EC_CLASS, | |
1103 | .ids = ec_device_ids, | |
1104 | .ops = { | |
1105 | .add = acpi_ec_add, | |
1106 | .remove = acpi_ec_remove, | |
223883b7 AS |
1107 | }, |
1108 | }; | |
1109 | ||
a5f820fe | 1110 | int __init acpi_ec_init(void) |
1da177e4 | 1111 | { |
50526df6 | 1112 | int result = 0; |
1da177e4 | 1113 | |
1da177e4 LT |
1114 | /* Now register the driver for the EC */ |
1115 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
49c6c5ff | 1116 | if (result < 0) |
d550d98d | 1117 | return -ENODEV; |
1da177e4 | 1118 | |
d550d98d | 1119 | return result; |
1da177e4 LT |
1120 | } |
1121 | ||
1da177e4 LT |
1122 | /* EC driver currently not unloadable */ |
1123 | #if 0 | |
50526df6 | 1124 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1125 | { |
1da177e4 LT |
1126 | |
1127 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
d550d98d | 1128 | return; |
1da177e4 | 1129 | } |
7843932a | 1130 | #endif /* 0 */ |