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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); |
c0d65341 | 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 | |
c0d65341 | 167 | static bool advance_transaction(struct acpi_ec *ec) |
7c6db5e5 | 168 | { |
36b15875 | 169 | struct transaction *t; |
66b42b78 | 170 | u8 status; |
c0d65341 | 171 | bool wakeup = false; |
b76b51ba | 172 | |
66b42b78 LZ |
173 | pr_debug("===== %s =====\n", in_interrupt() ? "IRQ" : "TASK"); |
174 | status = acpi_ec_read_status(ec); | |
36b15875 | 175 | t = ec->curr; |
b76b51ba | 176 | if (!t) |
f92fca00 LZ |
177 | goto err; |
178 | if (t->flags & ACPI_EC_COMMAND_POLL) { | |
179 | if (t->wlen > t->wi) { | |
180 | if ((status & ACPI_EC_FLAG_IBF) == 0) | |
181 | acpi_ec_write_data(ec, t->wdata[t->wi++]); | |
182 | else | |
183 | goto err; | |
184 | } else if (t->rlen > t->ri) { | |
185 | if ((status & ACPI_EC_FLAG_OBF) == 1) { | |
186 | t->rdata[t->ri++] = acpi_ec_read_data(ec); | |
c0d65341 | 187 | if (t->rlen == t->ri) { |
f92fca00 | 188 | t->flags |= ACPI_EC_COMMAND_COMPLETE; |
c0d65341 LZ |
189 | wakeup = true; |
190 | } | |
f92fca00 LZ |
191 | } else |
192 | goto err; | |
193 | } else if (t->wlen == t->wi && | |
c0d65341 | 194 | (status & ACPI_EC_FLAG_IBF) == 0) { |
f92fca00 | 195 | t->flags |= ACPI_EC_COMMAND_COMPLETE; |
c0d65341 LZ |
196 | wakeup = true; |
197 | } | |
198 | return wakeup; | |
f92fca00 LZ |
199 | } else { |
200 | if ((status & ACPI_EC_FLAG_IBF) == 0) { | |
201 | acpi_ec_write_cmd(ec, t->command); | |
202 | t->flags |= ACPI_EC_COMMAND_POLL; | |
7c6db4e0 | 203 | } else |
dd15f8c4 | 204 | goto err; |
c0d65341 | 205 | return wakeup; |
f92fca00 | 206 | } |
dd15f8c4 | 207 | err: |
a3cd8d27 FT |
208 | /* |
209 | * If SCI bit is set, then don't think it's a false IRQ | |
210 | * otherwise will take a not handled IRQ as a false one. | |
211 | */ | |
f92fca00 LZ |
212 | if (!(status & ACPI_EC_FLAG_SCI)) { |
213 | if (in_interrupt() && t) | |
214 | ++t->irq_count; | |
215 | } | |
c0d65341 | 216 | return wakeup; |
f92fca00 | 217 | } |
a3cd8d27 | 218 | |
f92fca00 LZ |
219 | static void start_transaction(struct acpi_ec *ec) |
220 | { | |
221 | ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0; | |
222 | ec->curr->flags = 0; | |
c0d65341 | 223 | (void)advance_transaction(ec); |
845625cd | 224 | } |
03d1d99c | 225 | |
3eba563e | 226 | static int acpi_ec_sync_query(struct acpi_ec *ec, u8 *data); |
7c6db4e0 | 227 | |
a62e8f19 | 228 | static int ec_check_sci_sync(struct acpi_ec *ec, u8 state) |
7c6db5e5 | 229 | { |
7c6db4e0 AS |
230 | if (state & ACPI_EC_FLAG_SCI) { |
231 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) | |
3eba563e | 232 | return acpi_ec_sync_query(ec, NULL); |
7c6db4e0 AS |
233 | } |
234 | return 0; | |
235 | } | |
236 | ||
237 | static int ec_poll(struct acpi_ec *ec) | |
238 | { | |
2a84cb98 | 239 | unsigned long flags; |
28fe5c82 | 240 | int repeat = 5; /* number of command restarts */ |
2a84cb98 AS |
241 | while (repeat--) { |
242 | unsigned long delay = jiffies + | |
7a18e96d | 243 | msecs_to_jiffies(ec_delay); |
2a84cb98 AS |
244 | do { |
245 | /* don't sleep with disabled interrupts */ | |
246 | if (EC_FLAGS_MSI || irqs_disabled()) { | |
247 | udelay(ACPI_EC_MSI_UDELAY); | |
f92fca00 | 248 | if (ec_transaction_completed(ec)) |
2a84cb98 AS |
249 | return 0; |
250 | } else { | |
251 | if (wait_event_timeout(ec->wait, | |
f92fca00 | 252 | ec_transaction_completed(ec), |
2a84cb98 AS |
253 | msecs_to_jiffies(1))) |
254 | return 0; | |
255 | } | |
f92fca00 | 256 | spin_lock_irqsave(&ec->lock, flags); |
c0d65341 | 257 | (void)advance_transaction(ec); |
f92fca00 | 258 | spin_unlock_irqrestore(&ec->lock, flags); |
2a84cb98 | 259 | } while (time_before(jiffies, delay)); |
16a26e85 | 260 | pr_debug("controller reset, restart transaction\n"); |
f351d027 | 261 | spin_lock_irqsave(&ec->lock, flags); |
2a84cb98 | 262 | start_transaction(ec); |
f351d027 | 263 | spin_unlock_irqrestore(&ec->lock, flags); |
af3fd140 | 264 | } |
b77d81b2 | 265 | return -ETIME; |
1da177e4 LT |
266 | } |
267 | ||
8463200a | 268 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
2a84cb98 | 269 | struct transaction *t) |
45bea155 | 270 | { |
7c6db4e0 | 271 | unsigned long tmp; |
7c6db4e0 | 272 | int ret = 0; |
5423a0cb | 273 | if (EC_FLAGS_MSI) |
2a84cb98 | 274 | udelay(ACPI_EC_MSI_UDELAY); |
7c6db4e0 | 275 | /* start transaction */ |
f351d027 | 276 | spin_lock_irqsave(&ec->lock, tmp); |
7c6db4e0 | 277 | /* following two actions should be kept atomic */ |
8463200a | 278 | ec->curr = t; |
a2f93aea | 279 | start_transaction(ec); |
8463200a | 280 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) |
080e412c | 281 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
f351d027 | 282 | spin_unlock_irqrestore(&ec->lock, tmp); |
2a84cb98 | 283 | ret = ec_poll(ec); |
f351d027 | 284 | spin_lock_irqsave(&ec->lock, tmp); |
8463200a | 285 | ec->curr = NULL; |
f351d027 | 286 | spin_unlock_irqrestore(&ec->lock, tmp); |
7c6db4e0 AS |
287 | return ret; |
288 | } | |
289 | ||
2a84cb98 | 290 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) |
1da177e4 | 291 | { |
d7a76e4c | 292 | int status; |
50526df6 | 293 | u32 glk; |
8463200a | 294 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
d550d98d | 295 | return -EINVAL; |
8463200a AS |
296 | if (t->rdata) |
297 | memset(t->rdata, 0, t->rlen); | |
f351d027 | 298 | mutex_lock(&ec->mutex); |
fe955682 | 299 | if (test_bit(EC_FLAGS_BLOCKED, &ec->flags)) { |
f6bb13aa RW |
300 | status = -EINVAL; |
301 | goto unlock; | |
302 | } | |
703959d4 | 303 | if (ec->global_lock) { |
1da177e4 | 304 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 305 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
306 | status = -ENODEV; |
307 | goto unlock; | |
c24e912b | 308 | } |
1da177e4 | 309 | } |
16a26e85 | 310 | pr_debug("transaction start (cmd=0x%02x, addr=0x%02x)\n", |
b76b51ba | 311 | t->command, t->wdata ? t->wdata[0] : 0); |
a62e8f19 AS |
312 | /* disable GPE during transaction if storm is detected */ |
313 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
3784730b RW |
314 | /* It has to be disabled, so that it doesn't trigger. */ |
315 | acpi_disable_gpe(NULL, ec->gpe); | |
a62e8f19 AS |
316 | } |
317 | ||
2a84cb98 | 318 | status = acpi_ec_transaction_unlocked(ec, t); |
a62e8f19 AS |
319 | |
320 | /* check if we received SCI during transaction */ | |
321 | ec_check_sci_sync(ec, acpi_ec_read_status(ec)); | |
322 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
54070101 | 323 | msleep(1); |
3784730b RW |
324 | /* It is safe to enable the GPE outside of the transaction. */ |
325 | acpi_enable_gpe(NULL, ec->gpe); | |
a520d52e | 326 | } else if (t->irq_count > ec_storm_threshold) { |
16a26e85 | 327 | pr_info("GPE storm detected(%d GPEs), " |
b76b51ba FT |
328 | "transactions will use polling mode\n", |
329 | t->irq_count); | |
a62e8f19 AS |
330 | set_bit(EC_FLAGS_GPE_STORM, &ec->flags); |
331 | } | |
16a26e85 | 332 | pr_debug("transaction end\n"); |
703959d4 | 333 | if (ec->global_lock) |
1da177e4 | 334 | acpi_release_global_lock(glk); |
7c6db4e0 | 335 | unlock: |
f351d027 | 336 | mutex_unlock(&ec->mutex); |
d550d98d | 337 | return status; |
1da177e4 LT |
338 | } |
339 | ||
8a383ef0 | 340 | static int acpi_ec_burst_enable(struct acpi_ec *ec) |
c45aac43 AS |
341 | { |
342 | u8 d; | |
8463200a AS |
343 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
344 | .wdata = NULL, .rdata = &d, | |
345 | .wlen = 0, .rlen = 1}; | |
346 | ||
2a84cb98 | 347 | return acpi_ec_transaction(ec, &t); |
c45aac43 AS |
348 | } |
349 | ||
8a383ef0 | 350 | static int acpi_ec_burst_disable(struct acpi_ec *ec) |
c45aac43 | 351 | { |
8463200a AS |
352 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
353 | .wdata = NULL, .rdata = NULL, | |
354 | .wlen = 0, .rlen = 0}; | |
355 | ||
7c6db4e0 | 356 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
2a84cb98 | 357 | acpi_ec_transaction(ec, &t) : 0; |
c45aac43 AS |
358 | } |
359 | ||
6ccedb10 | 360 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) |
3576cf61 DS |
361 | { |
362 | int result; | |
363 | u8 d; | |
8463200a AS |
364 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
365 | .wdata = &address, .rdata = &d, | |
366 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 367 | |
2a84cb98 | 368 | result = acpi_ec_transaction(ec, &t); |
3576cf61 DS |
369 | *data = d; |
370 | return result; | |
371 | } | |
6ffb221a | 372 | |
3576cf61 DS |
373 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
374 | { | |
6ccedb10 | 375 | u8 wdata[2] = { address, data }; |
8463200a AS |
376 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
377 | .wdata = wdata, .rdata = NULL, | |
378 | .wlen = 2, .rlen = 0}; | |
379 | ||
2a84cb98 | 380 | return acpi_ec_transaction(ec, &t); |
3576cf61 DS |
381 | } |
382 | ||
b76b51ba | 383 | int ec_read(u8 addr, u8 *val) |
1da177e4 | 384 | { |
1da177e4 | 385 | int err; |
6ffb221a | 386 | u8 temp_data; |
1da177e4 LT |
387 | |
388 | if (!first_ec) | |
389 | return -ENODEV; | |
390 | ||
d033879c | 391 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
392 | |
393 | if (!err) { | |
394 | *val = temp_data; | |
395 | return 0; | |
50526df6 | 396 | } else |
1da177e4 LT |
397 | return err; |
398 | } | |
50526df6 | 399 | |
1da177e4 LT |
400 | EXPORT_SYMBOL(ec_read); |
401 | ||
50526df6 | 402 | int ec_write(u8 addr, u8 val) |
1da177e4 | 403 | { |
1da177e4 LT |
404 | int err; |
405 | ||
406 | if (!first_ec) | |
407 | return -ENODEV; | |
408 | ||
d033879c | 409 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
410 | |
411 | return err; | |
412 | } | |
50526df6 | 413 | |
1da177e4 LT |
414 | EXPORT_SYMBOL(ec_write); |
415 | ||
616362de | 416 | int ec_transaction(u8 command, |
9e197219 | 417 | const u8 * wdata, unsigned wdata_len, |
1cb7b1e0 | 418 | u8 * rdata, unsigned rdata_len) |
45bea155 | 419 | { |
8463200a AS |
420 | struct transaction t = {.command = command, |
421 | .wdata = wdata, .rdata = rdata, | |
422 | .wlen = wdata_len, .rlen = rdata_len}; | |
d7a76e4c LP |
423 | if (!first_ec) |
424 | return -ENODEV; | |
45bea155 | 425 | |
2a84cb98 | 426 | return acpi_ec_transaction(first_ec, &t); |
45bea155 | 427 | } |
1da177e4 | 428 | |
ab9e43c6 LP |
429 | EXPORT_SYMBOL(ec_transaction); |
430 | ||
3e2abc5a SF |
431 | /* Get the handle to the EC device */ |
432 | acpi_handle ec_get_handle(void) | |
433 | { | |
434 | if (!first_ec) | |
435 | return NULL; | |
436 | return first_ec->handle; | |
437 | } | |
438 | ||
439 | EXPORT_SYMBOL(ec_get_handle); | |
440 | ||
ad332c8a | 441 | /* |
3eba563e | 442 | * Process _Q events that might have accumulated in the EC. |
ad332c8a KC |
443 | * Run with locked ec mutex. |
444 | */ | |
445 | static void acpi_ec_clear(struct acpi_ec *ec) | |
446 | { | |
447 | int i, status; | |
448 | u8 value = 0; | |
449 | ||
450 | for (i = 0; i < ACPI_EC_CLEAR_MAX; i++) { | |
3eba563e | 451 | status = acpi_ec_sync_query(ec, &value); |
ad332c8a KC |
452 | if (status || !value) |
453 | break; | |
454 | } | |
455 | ||
456 | if (unlikely(i == ACPI_EC_CLEAR_MAX)) | |
457 | pr_warn("Warning: Maximum of %d stale EC events cleared\n", i); | |
458 | else | |
459 | pr_info("%d stale EC events cleared\n", i); | |
460 | } | |
461 | ||
fe955682 | 462 | void acpi_ec_block_transactions(void) |
f6bb13aa RW |
463 | { |
464 | struct acpi_ec *ec = first_ec; | |
465 | ||
466 | if (!ec) | |
467 | return; | |
468 | ||
f351d027 | 469 | mutex_lock(&ec->mutex); |
f6bb13aa | 470 | /* Prevent transactions from being carried out */ |
fe955682 | 471 | set_bit(EC_FLAGS_BLOCKED, &ec->flags); |
f351d027 | 472 | mutex_unlock(&ec->mutex); |
f6bb13aa RW |
473 | } |
474 | ||
fe955682 | 475 | void acpi_ec_unblock_transactions(void) |
f6bb13aa RW |
476 | { |
477 | struct acpi_ec *ec = first_ec; | |
478 | ||
479 | if (!ec) | |
480 | return; | |
481 | ||
f351d027 | 482 | mutex_lock(&ec->mutex); |
f6bb13aa | 483 | /* Allow transactions to be carried out again */ |
fe955682 | 484 | clear_bit(EC_FLAGS_BLOCKED, &ec->flags); |
ad332c8a KC |
485 | |
486 | if (EC_FLAGS_CLEAR_ON_RESUME) | |
487 | acpi_ec_clear(ec); | |
488 | ||
f351d027 | 489 | mutex_unlock(&ec->mutex); |
f6bb13aa RW |
490 | } |
491 | ||
fe955682 | 492 | void acpi_ec_unblock_transactions_early(void) |
d5a64513 RW |
493 | { |
494 | /* | |
495 | * Allow transactions to happen again (this function is called from | |
496 | * atomic context during wakeup, so we don't need to acquire the mutex). | |
497 | */ | |
498 | if (first_ec) | |
fe955682 | 499 | clear_bit(EC_FLAGS_BLOCKED, &first_ec->flags); |
d5a64513 RW |
500 | } |
501 | ||
a62e8f19 | 502 | static int acpi_ec_query_unlocked(struct acpi_ec *ec, u8 * data) |
3576cf61 DS |
503 | { |
504 | int result; | |
6ccedb10 | 505 | u8 d; |
8463200a AS |
506 | struct transaction t = {.command = ACPI_EC_COMMAND_QUERY, |
507 | .wdata = NULL, .rdata = &d, | |
508 | .wlen = 0, .rlen = 1}; | |
6ccedb10 AS |
509 | if (!ec || !data) |
510 | return -EINVAL; | |
6ccedb10 AS |
511 | /* |
512 | * Query the EC to find out which _Qxx method we need to evaluate. | |
513 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
514 | * bit to be cleared (and thus clearing the interrupt source). | |
515 | */ | |
a62e8f19 | 516 | result = acpi_ec_transaction_unlocked(ec, &t); |
6ccedb10 AS |
517 | if (result) |
518 | return result; | |
6ccedb10 AS |
519 | if (!d) |
520 | return -ENODATA; | |
6ccedb10 AS |
521 | *data = d; |
522 | return 0; | |
1da177e4 LT |
523 | } |
524 | ||
1da177e4 LT |
525 | /* -------------------------------------------------------------------------- |
526 | Event Management | |
527 | -------------------------------------------------------------------------- */ | |
837012ed AS |
528 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
529 | acpi_handle handle, acpi_ec_query_func func, | |
530 | void *data) | |
531 | { | |
532 | struct acpi_ec_query_handler *handler = | |
533 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
534 | if (!handler) | |
535 | return -ENOMEM; | |
536 | ||
537 | handler->query_bit = query_bit; | |
538 | handler->handle = handle; | |
539 | handler->func = func; | |
540 | handler->data = data; | |
f351d027 | 541 | mutex_lock(&ec->mutex); |
30c08574 | 542 | list_add(&handler->node, &ec->list); |
f351d027 | 543 | mutex_unlock(&ec->mutex); |
837012ed AS |
544 | return 0; |
545 | } | |
546 | ||
547 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); | |
548 | ||
549 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
550 | { | |
1544fdbc | 551 | struct acpi_ec_query_handler *handler, *tmp; |
f351d027 | 552 | mutex_lock(&ec->mutex); |
1544fdbc | 553 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
554 | if (query_bit == handler->query_bit) { |
555 | list_del(&handler->node); | |
556 | kfree(handler); | |
837012ed AS |
557 | } |
558 | } | |
f351d027 | 559 | mutex_unlock(&ec->mutex); |
837012ed AS |
560 | } |
561 | ||
562 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); | |
1da177e4 | 563 | |
a62e8f19 | 564 | static void acpi_ec_run(void *cxt) |
45bea155 | 565 | { |
a62e8f19 AS |
566 | struct acpi_ec_query_handler *handler = cxt; |
567 | if (!handler) | |
e41334c0 | 568 | return; |
16a26e85 | 569 | pr_debug("start query execution\n"); |
a62e8f19 AS |
570 | if (handler->func) |
571 | handler->func(handler->data); | |
572 | else if (handler->handle) | |
573 | acpi_evaluate_object(handler->handle, NULL, NULL, NULL); | |
16a26e85 | 574 | pr_debug("stop query execution\n"); |
a62e8f19 AS |
575 | kfree(handler); |
576 | } | |
577 | ||
3eba563e | 578 | static int acpi_ec_sync_query(struct acpi_ec *ec, u8 *data) |
a62e8f19 AS |
579 | { |
580 | u8 value = 0; | |
581 | int status; | |
582 | struct acpi_ec_query_handler *handler, *copy; | |
3eba563e KC |
583 | |
584 | status = acpi_ec_query_unlocked(ec, &value); | |
585 | if (data) | |
586 | *data = value; | |
587 | if (status) | |
a62e8f19 | 588 | return status; |
3eba563e | 589 | |
837012ed AS |
590 | list_for_each_entry(handler, &ec->list, node) { |
591 | if (value == handler->query_bit) { | |
592 | /* have custom handler for this bit */ | |
a62e8f19 AS |
593 | copy = kmalloc(sizeof(*handler), GFP_KERNEL); |
594 | if (!copy) | |
595 | return -ENOMEM; | |
596 | memcpy(copy, handler, sizeof(*copy)); | |
16a26e85 LT |
597 | pr_debug("push query execution (0x%2x) on queue\n", |
598 | value); | |
f5347867 AS |
599 | return acpi_os_execute((copy->func) ? |
600 | OSL_NOTIFY_HANDLER : OSL_GPE_HANDLER, | |
a62e8f19 | 601 | acpi_ec_run, copy); |
837012ed AS |
602 | } |
603 | } | |
a62e8f19 AS |
604 | return 0; |
605 | } | |
606 | ||
607 | static void acpi_ec_gpe_query(void *ec_cxt) | |
608 | { | |
609 | struct acpi_ec *ec = ec_cxt; | |
610 | if (!ec) | |
611 | return; | |
f351d027 | 612 | mutex_lock(&ec->mutex); |
3eba563e | 613 | acpi_ec_sync_query(ec, NULL); |
f351d027 | 614 | mutex_unlock(&ec->mutex); |
45bea155 | 615 | } |
1da177e4 | 616 | |
a62e8f19 AS |
617 | static int ec_check_sci(struct acpi_ec *ec, u8 state) |
618 | { | |
619 | if (state & ACPI_EC_FLAG_SCI) { | |
620 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) { | |
16a26e85 | 621 | pr_debug("push gpe query to the queue\n"); |
a62e8f19 AS |
622 | return acpi_os_execute(OSL_NOTIFY_HANDLER, |
623 | acpi_ec_gpe_query, ec); | |
624 | } | |
625 | } | |
626 | return 0; | |
627 | } | |
628 | ||
8b6cd8ad LM |
629 | static u32 acpi_ec_gpe_handler(acpi_handle gpe_device, |
630 | u32 gpe_number, void *data) | |
1da177e4 | 631 | { |
f92fca00 | 632 | unsigned long flags; |
3d02b90b | 633 | struct acpi_ec *ec = data; |
7c6db4e0 | 634 | |
f92fca00 | 635 | spin_lock_irqsave(&ec->lock, flags); |
c0d65341 | 636 | if (advance_transaction(ec)) |
2a84cb98 | 637 | wake_up(&ec->wait); |
c0d65341 LZ |
638 | spin_unlock_irqrestore(&ec->lock, flags); |
639 | ec_check_sci(ec, acpi_ec_read_status(ec)); | |
bba63a29 | 640 | return ACPI_INTERRUPT_HANDLED | ACPI_REENABLE_GPE; |
845625cd AS |
641 | } |
642 | ||
1da177e4 LT |
643 | /* -------------------------------------------------------------------------- |
644 | Address Space Management | |
645 | -------------------------------------------------------------------------- */ | |
646 | ||
1da177e4 | 647 | static acpi_status |
5b7734b4 | 648 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
dadf28a1 | 649 | u32 bits, u64 *value64, |
50526df6 | 650 | void *handler_context, void *region_context) |
1da177e4 | 651 | { |
3d02b90b | 652 | struct acpi_ec *ec = handler_context; |
dadf28a1 AS |
653 | int result = 0, i, bytes = bits / 8; |
654 | u8 *value = (u8 *)value64; | |
1da177e4 | 655 | |
1da177e4 | 656 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 657 | return AE_BAD_PARAMETER; |
1da177e4 | 658 | |
5b7734b4 | 659 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 660 | return AE_BAD_PARAMETER; |
1da177e4 | 661 | |
dadf28a1 | 662 | if (EC_FLAGS_MSI || bits > 8) |
6a63b06f | 663 | acpi_ec_burst_enable(ec); |
b3b233c7 | 664 | |
dadf28a1 AS |
665 | for (i = 0; i < bytes; ++i, ++address, ++value) |
666 | result = (function == ACPI_READ) ? | |
667 | acpi_ec_read(ec, address, value) : | |
668 | acpi_ec_write(ec, address, *value); | |
1da177e4 | 669 | |
dadf28a1 | 670 | if (EC_FLAGS_MSI || bits > 8) |
6a63b06f | 671 | acpi_ec_burst_disable(ec); |
b3b233c7 | 672 | |
1da177e4 LT |
673 | switch (result) { |
674 | case -EINVAL: | |
d550d98d | 675 | return AE_BAD_PARAMETER; |
1da177e4 LT |
676 | break; |
677 | case -ENODEV: | |
d550d98d | 678 | return AE_NOT_FOUND; |
1da177e4 LT |
679 | break; |
680 | case -ETIME: | |
d550d98d | 681 | return AE_TIME; |
1da177e4 LT |
682 | break; |
683 | default: | |
d550d98d | 684 | return AE_OK; |
1da177e4 | 685 | } |
1da177e4 LT |
686 | } |
687 | ||
1da177e4 LT |
688 | /* -------------------------------------------------------------------------- |
689 | Driver Interface | |
690 | -------------------------------------------------------------------------- */ | |
c0900c35 AS |
691 | static acpi_status |
692 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
693 | ||
c0900c35 AS |
694 | static struct acpi_ec *make_acpi_ec(void) |
695 | { | |
696 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
697 | if (!ec) | |
698 | return NULL; | |
080e412c | 699 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
f351d027 | 700 | mutex_init(&ec->mutex); |
c0900c35 | 701 | init_waitqueue_head(&ec->wait); |
837012ed | 702 | INIT_LIST_HEAD(&ec->list); |
f351d027 | 703 | spin_lock_init(&ec->lock); |
c0900c35 AS |
704 | return ec; |
705 | } | |
837012ed | 706 | |
c019b193 AS |
707 | static acpi_status |
708 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
709 | void *context, void **return_value) | |
710 | { | |
0175d562 LM |
711 | char node_name[5]; |
712 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
c019b193 AS |
713 | struct acpi_ec *ec = context; |
714 | int value = 0; | |
0175d562 LM |
715 | acpi_status status; |
716 | ||
717 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); | |
718 | ||
719 | if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) { | |
c019b193 AS |
720 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
721 | } | |
722 | return AE_OK; | |
723 | } | |
724 | ||
cd8c93a4 AS |
725 | static acpi_status |
726 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 727 | { |
cd8c93a4 | 728 | acpi_status status; |
d21cf3c1 | 729 | unsigned long long tmp = 0; |
cd8c93a4 AS |
730 | |
731 | struct acpi_ec *ec = context; | |
a5032bfd AS |
732 | |
733 | /* clear addr values, ec_parse_io_ports depend on it */ | |
734 | ec->command_addr = ec->data_addr = 0; | |
735 | ||
cd8c93a4 AS |
736 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
737 | ec_parse_io_ports, ec); | |
738 | if (ACPI_FAILURE(status)) | |
739 | return status; | |
837012ed AS |
740 | |
741 | /* Get GPE bit assignment (EC events). */ | |
742 | /* TODO: Add support for _GPE returning a package */ | |
27663c58 | 743 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
cd8c93a4 AS |
744 | if (ACPI_FAILURE(status)) |
745 | return status; | |
27663c58 | 746 | ec->gpe = tmp; |
837012ed | 747 | /* Use the global lock for all EC transactions? */ |
d21cf3c1 | 748 | tmp = 0; |
27663c58 MW |
749 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
750 | ec->global_lock = tmp; | |
837012ed | 751 | ec->handle = handle; |
cd8c93a4 | 752 | return AE_CTRL_TERMINATE; |
837012ed AS |
753 | } |
754 | ||
5efc5476 BH |
755 | static int ec_install_handlers(struct acpi_ec *ec) |
756 | { | |
757 | acpi_status status; | |
758 | if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) | |
759 | return 0; | |
760 | status = acpi_install_gpe_handler(NULL, ec->gpe, | |
761 | ACPI_GPE_EDGE_TRIGGERED, | |
762 | &acpi_ec_gpe_handler, ec); | |
763 | if (ACPI_FAILURE(status)) | |
764 | return -ENODEV; | |
9630bdd9 | 765 | |
a44061aa | 766 | acpi_enable_gpe(NULL, ec->gpe); |
5efc5476 BH |
767 | status = acpi_install_address_space_handler(ec->handle, |
768 | ACPI_ADR_SPACE_EC, | |
769 | &acpi_ec_space_handler, | |
770 | NULL, ec); | |
771 | if (ACPI_FAILURE(status)) { | |
772 | if (status == AE_NOT_FOUND) { | |
773 | /* | |
774 | * Maybe OS fails in evaluating the _REG object. | |
775 | * The AE_NOT_FOUND error will be ignored and OS | |
776 | * continue to initialize EC. | |
777 | */ | |
16a26e85 | 778 | pr_err("Fail in evaluating the _REG object" |
5efc5476 BH |
779 | " of EC device. Broken bios is suspected.\n"); |
780 | } else { | |
42b946bb | 781 | acpi_disable_gpe(NULL, ec->gpe); |
5efc5476 BH |
782 | acpi_remove_gpe_handler(NULL, ec->gpe, |
783 | &acpi_ec_gpe_handler); | |
784 | return -ENODEV; | |
785 | } | |
786 | } | |
787 | ||
788 | set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); | |
789 | return 0; | |
790 | } | |
791 | ||
4c611060 AS |
792 | static void ec_remove_handlers(struct acpi_ec *ec) |
793 | { | |
a44061aa | 794 | acpi_disable_gpe(NULL, ec->gpe); |
4c611060 AS |
795 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, |
796 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
16a26e85 | 797 | pr_err("failed to remove space handler\n"); |
4c611060 AS |
798 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
799 | &acpi_ec_gpe_handler))) | |
16a26e85 | 800 | pr_err("failed to remove gpe handler\n"); |
7c6db4e0 | 801 | clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
4c611060 AS |
802 | } |
803 | ||
703959d4 | 804 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 805 | { |
703959d4 | 806 | struct acpi_ec *ec = NULL; |
d02be047 | 807 | int ret; |
45bea155 | 808 | |
c0900c35 AS |
809 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
810 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
811 | ||
4c611060 | 812 | /* Check for boot EC */ |
ce52ddf5 AS |
813 | if (boot_ec && |
814 | (boot_ec->handle == device->handle || | |
815 | boot_ec->handle == ACPI_ROOT_OBJECT)) { | |
816 | ec = boot_ec; | |
817 | boot_ec = NULL; | |
818 | } else { | |
819 | ec = make_acpi_ec(); | |
820 | if (!ec) | |
821 | return -ENOMEM; | |
a5032bfd AS |
822 | } |
823 | if (ec_parse_device(device->handle, 0, ec, NULL) != | |
824 | AE_CTRL_TERMINATE) { | |
ce52ddf5 AS |
825 | kfree(ec); |
826 | return -EINVAL; | |
4c611060 AS |
827 | } |
828 | ||
ce52ddf5 AS |
829 | /* Find and register all query methods */ |
830 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
2263576c | 831 | acpi_ec_register_query_methods, NULL, ec, NULL); |
ce52ddf5 | 832 | |
4c611060 AS |
833 | if (!first_ec) |
834 | first_ec = ec; | |
db89b4f0 | 835 | device->driver_data = ec; |
de4f1046 | 836 | |
d6795fe3 AK |
837 | ret = !!request_region(ec->data_addr, 1, "EC data"); |
838 | WARN(!ret, "Could not request EC data io port 0x%lx", ec->data_addr); | |
839 | ret = !!request_region(ec->command_addr, 1, "EC cmd"); | |
840 | WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr); | |
de4f1046 | 841 | |
16a26e85 | 842 | pr_info("GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 843 | ec->gpe, ec->command_addr, ec->data_addr); |
5efc5476 BH |
844 | |
845 | ret = ec_install_handlers(ec); | |
846 | ||
847 | /* EC is fully operational, allow queries */ | |
848 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); | |
ad332c8a KC |
849 | |
850 | /* Clear stale _Q events if hardware might require that */ | |
851 | if (EC_FLAGS_CLEAR_ON_RESUME) { | |
852 | mutex_lock(&ec->mutex); | |
853 | acpi_ec_clear(ec); | |
854 | mutex_unlock(&ec->mutex); | |
855 | } | |
5efc5476 | 856 | return ret; |
1da177e4 LT |
857 | } |
858 | ||
51fac838 | 859 | static int acpi_ec_remove(struct acpi_device *device) |
1da177e4 | 860 | { |
01f22462 | 861 | struct acpi_ec *ec; |
07ddf768 | 862 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 863 | |
1da177e4 | 864 | if (!device) |
d550d98d | 865 | return -EINVAL; |
1da177e4 LT |
866 | |
867 | ec = acpi_driver_data(device); | |
cf745ec7 | 868 | ec_remove_handlers(ec); |
f351d027 | 869 | mutex_lock(&ec->mutex); |
07ddf768 | 870 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
871 | list_del(&handler->node); |
872 | kfree(handler); | |
873 | } | |
f351d027 | 874 | mutex_unlock(&ec->mutex); |
de4f1046 TR |
875 | release_region(ec->data_addr, 1); |
876 | release_region(ec->command_addr, 1); | |
db89b4f0 | 877 | device->driver_data = NULL; |
d033879c | 878 | if (ec == first_ec) |
c0900c35 | 879 | first_ec = NULL; |
4c611060 | 880 | kfree(ec); |
d550d98d | 881 | return 0; |
1da177e4 LT |
882 | } |
883 | ||
1da177e4 | 884 | static acpi_status |
c0900c35 | 885 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 886 | { |
3d02b90b | 887 | struct acpi_ec *ec = context; |
1da177e4 | 888 | |
01f22462 | 889 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 890 | return AE_OK; |
1da177e4 LT |
891 | |
892 | /* | |
893 | * The first address region returned is the data port, and | |
894 | * the second address region returned is the status/command | |
895 | * port. | |
896 | */ | |
de4f1046 | 897 | if (ec->data_addr == 0) |
6ffb221a | 898 | ec->data_addr = resource->data.io.minimum; |
de4f1046 | 899 | else if (ec->command_addr == 0) |
6ffb221a | 900 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 901 | else |
1da177e4 | 902 | return AE_CTRL_TERMINATE; |
1da177e4 | 903 | |
1da177e4 LT |
904 | return AE_OK; |
905 | } | |
906 | ||
c04209a7 AS |
907 | int __init acpi_boot_ec_enable(void) |
908 | { | |
7c6db4e0 | 909 | if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags)) |
c04209a7 AS |
910 | return 0; |
911 | if (!ec_install_handlers(boot_ec)) { | |
912 | first_ec = boot_ec; | |
913 | return 0; | |
914 | } | |
915 | return -EFAULT; | |
916 | } | |
917 | ||
223883b7 AS |
918 | static const struct acpi_device_id ec_device_ids[] = { |
919 | {"PNP0C09", 0}, | |
920 | {"", 0}, | |
921 | }; | |
922 | ||
478fa03b AS |
923 | /* Some BIOS do not survive early DSDT scan, skip it */ |
924 | static int ec_skip_dsdt_scan(const struct dmi_system_id *id) | |
925 | { | |
926 | EC_FLAGS_SKIP_DSDT_SCAN = 1; | |
927 | return 0; | |
928 | } | |
929 | ||
0adf3c74 AS |
930 | /* ASUStek often supplies us with broken ECDT, validate it */ |
931 | static int ec_validate_ecdt(const struct dmi_system_id *id) | |
932 | { | |
933 | EC_FLAGS_VALIDATE_ECDT = 1; | |
934 | return 0; | |
935 | } | |
936 | ||
937 | /* MSI EC needs special treatment, enable it */ | |
938 | static int ec_flag_msi(const struct dmi_system_id *id) | |
939 | { | |
16a26e85 | 940 | pr_debug("Detected MSI hardware, enabling workarounds.\n"); |
0adf3c74 AS |
941 | EC_FLAGS_MSI = 1; |
942 | EC_FLAGS_VALIDATE_ECDT = 1; | |
943 | return 0; | |
944 | } | |
945 | ||
67bfa9b6 FT |
946 | /* |
947 | * Clevo M720 notebook actually works ok with IRQ mode, if we lifted | |
948 | * the GPE storm threshold back to 20 | |
949 | */ | |
950 | static int ec_enlarge_storm_threshold(const struct dmi_system_id *id) | |
951 | { | |
952 | pr_debug("Setting the EC GPE storm threshold to 20\n"); | |
953 | ec_storm_threshold = 20; | |
954 | return 0; | |
955 | } | |
956 | ||
ad332c8a KC |
957 | /* |
958 | * On some hardware it is necessary to clear events accumulated by the EC during | |
959 | * sleep. These ECs stop reporting GPEs until they are manually polled, if too | |
960 | * many events are accumulated. (e.g. Samsung Series 5/9 notebooks) | |
961 | * | |
962 | * https://bugzilla.kernel.org/show_bug.cgi?id=44161 | |
963 | * | |
964 | * Ideally, the EC should also be instructed NOT to accumulate events during | |
965 | * sleep (which Windows seems to do somehow), but the interface to control this | |
966 | * behaviour is not known at this time. | |
967 | * | |
968 | * Models known to be affected are Samsung 530Uxx/535Uxx/540Uxx/550Pxx/900Xxx, | |
969 | * however it is very likely that other Samsung models are affected. | |
970 | * | |
971 | * On systems which don't accumulate _Q events during sleep, this extra check | |
972 | * should be harmless. | |
973 | */ | |
974 | static int ec_clear_on_resume(const struct dmi_system_id *id) | |
975 | { | |
976 | pr_debug("Detected system needing EC poll on resume.\n"); | |
977 | EC_FLAGS_CLEAR_ON_RESUME = 1; | |
978 | return 0; | |
979 | } | |
980 | ||
6cef7497 | 981 | static struct dmi_system_id ec_dmi_table[] __initdata = { |
478fa03b AS |
982 | { |
983 | ec_skip_dsdt_scan, "Compal JFL92", { | |
984 | DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"), | |
985 | DMI_MATCH(DMI_BOARD_NAME, "JFL92") }, NULL}, | |
0adf3c74 AS |
986 | { |
987 | ec_flag_msi, "MSI hardware", { | |
55b313f2 AS |
988 | DMI_MATCH(DMI_BIOS_VENDOR, "Micro-Star")}, NULL}, |
989 | { | |
990 | ec_flag_msi, "MSI hardware", { | |
991 | DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star")}, NULL}, | |
992 | { | |
993 | ec_flag_msi, "MSI hardware", { | |
994 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-Star")}, NULL}, | |
0adf3c74 | 995 | { |
a5dc4f89 AS |
996 | ec_flag_msi, "MSI hardware", { |
997 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-STAR")}, NULL}, | |
998 | { | |
534bc4e3 ZR |
999 | ec_flag_msi, "Quanta hardware", { |
1000 | DMI_MATCH(DMI_SYS_VENDOR, "Quanta"), | |
1001 | DMI_MATCH(DMI_PRODUCT_NAME, "TW8/SW8/DW8"),}, NULL}, | |
1002 | { | |
1003 | ec_flag_msi, "Quanta hardware", { | |
1004 | DMI_MATCH(DMI_SYS_VENDOR, "Quanta"), | |
1005 | DMI_MATCH(DMI_PRODUCT_NAME, "TW9/SW9"),}, NULL}, | |
1006 | { | |
0adf3c74 AS |
1007 | ec_validate_ecdt, "ASUS hardware", { |
1008 | DMI_MATCH(DMI_BIOS_VENDOR, "ASUS") }, NULL}, | |
af986d10 PC |
1009 | { |
1010 | ec_validate_ecdt, "ASUS hardware", { | |
1011 | DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc.") }, NULL}, | |
67bfa9b6 FT |
1012 | { |
1013 | ec_enlarge_storm_threshold, "CLEVO hardware", { | |
1014 | DMI_MATCH(DMI_SYS_VENDOR, "CLEVO Co."), | |
1015 | DMI_MATCH(DMI_PRODUCT_NAME, "M720T/M730T"),}, NULL}, | |
eff9a4b6 LT |
1016 | { |
1017 | ec_skip_dsdt_scan, "HP Folio 13", { | |
1018 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), | |
1019 | DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13"),}, NULL}, | |
524f42fa LT |
1020 | { |
1021 | ec_validate_ecdt, "ASUS hardware", { | |
1022 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTek Computer Inc."), | |
1023 | DMI_MATCH(DMI_PRODUCT_NAME, "L4R"),}, NULL}, | |
ad332c8a KC |
1024 | { |
1025 | ec_clear_on_resume, "Samsung hardware", { | |
1026 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD.")}, NULL}, | |
0adf3c74 AS |
1027 | {}, |
1028 | }; | |
1029 | ||
c0900c35 AS |
1030 | int __init acpi_ec_ecdt_probe(void) |
1031 | { | |
c0900c35 | 1032 | acpi_status status; |
c6cb0e87 | 1033 | struct acpi_ec *saved_ec = NULL; |
50526df6 | 1034 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 1035 | |
d66d969d AS |
1036 | boot_ec = make_acpi_ec(); |
1037 | if (!boot_ec) | |
c0900c35 AS |
1038 | return -ENOMEM; |
1039 | /* | |
1040 | * Generate a boot ec context | |
1041 | */ | |
0adf3c74 | 1042 | dmi_check_system(ec_dmi_table); |
15a58ed1 AS |
1043 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
1044 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 1045 | if (ACPI_SUCCESS(status)) { |
16a26e85 | 1046 | pr_info("EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
1047 | boot_ec->command_addr = ecdt_ptr->control.address; |
1048 | boot_ec->data_addr = ecdt_ptr->data.address; | |
1049 | boot_ec->gpe = ecdt_ptr->gpe; | |
4af8e10a | 1050 | boot_ec->handle = ACPI_ROOT_OBJECT; |
ce52ddf5 | 1051 | acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle); |
c6cb0e87 | 1052 | /* Don't trust ECDT, which comes from ASUSTek */ |
0adf3c74 | 1053 | if (!EC_FLAGS_VALIDATE_ECDT) |
c5279dee | 1054 | goto install; |
d6bd535d | 1055 | saved_ec = kmemdup(boot_ec, sizeof(struct acpi_ec), GFP_KERNEL); |
c6cb0e87 AS |
1056 | if (!saved_ec) |
1057 | return -ENOMEM; | |
c5279dee | 1058 | /* fall through */ |
cd8c93a4 | 1059 | } |
0adf3c74 | 1060 | |
478fa03b AS |
1061 | if (EC_FLAGS_SKIP_DSDT_SCAN) |
1062 | return -ENODEV; | |
1063 | ||
c5279dee AS |
1064 | /* This workaround is needed only on some broken machines, |
1065 | * which require early EC, but fail to provide ECDT */ | |
16a26e85 | 1066 | pr_debug("Look up EC in DSDT\n"); |
c5279dee AS |
1067 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, |
1068 | boot_ec, NULL); | |
1069 | /* Check that acpi_get_devices actually find something */ | |
1070 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
1071 | goto error; | |
c6cb0e87 AS |
1072 | if (saved_ec) { |
1073 | /* try to find good ECDT from ASUSTek */ | |
1074 | if (saved_ec->command_addr != boot_ec->command_addr || | |
1075 | saved_ec->data_addr != boot_ec->data_addr || | |
1076 | saved_ec->gpe != boot_ec->gpe || | |
1077 | saved_ec->handle != boot_ec->handle) | |
16a26e85 | 1078 | pr_info("ASUSTek keeps feeding us with broken " |
c6cb0e87 AS |
1079 | "ECDT tables, which are very hard to workaround. " |
1080 | "Trying to use DSDT EC info instead. Please send " | |
1081 | "output of acpidump to linux-acpi@vger.kernel.org\n"); | |
1082 | kfree(saved_ec); | |
1083 | saved_ec = NULL; | |
1084 | } else { | |
1085 | /* We really need to limit this workaround, the only ASUS, | |
1086 | * which needs it, has fake EC._INI method, so use it as flag. | |
1087 | * Keep boot_ec struct as it will be needed soon. | |
1088 | */ | |
c6cb0e87 | 1089 | if (!dmi_name_in_vendors("ASUS") || |
952c63e9 | 1090 | !acpi_has_method(boot_ec->handle, "_INI")) |
c6cb0e87 AS |
1091 | return -ENODEV; |
1092 | } | |
c5279dee AS |
1093 | install: |
1094 | if (!ec_install_handlers(boot_ec)) { | |
d033879c | 1095 | first_ec = boot_ec; |
e8284321 | 1096 | return 0; |
d033879c | 1097 | } |
c5279dee | 1098 | error: |
d66d969d AS |
1099 | kfree(boot_ec); |
1100 | boot_ec = NULL; | |
1da177e4 LT |
1101 | return -ENODEV; |
1102 | } | |
1103 | ||
223883b7 AS |
1104 | static struct acpi_driver acpi_ec_driver = { |
1105 | .name = "ec", | |
1106 | .class = ACPI_EC_CLASS, | |
1107 | .ids = ec_device_ids, | |
1108 | .ops = { | |
1109 | .add = acpi_ec_add, | |
1110 | .remove = acpi_ec_remove, | |
223883b7 AS |
1111 | }, |
1112 | }; | |
1113 | ||
a5f820fe | 1114 | int __init acpi_ec_init(void) |
1da177e4 | 1115 | { |
50526df6 | 1116 | int result = 0; |
1da177e4 | 1117 | |
1da177e4 LT |
1118 | /* Now register the driver for the EC */ |
1119 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
49c6c5ff | 1120 | if (result < 0) |
d550d98d | 1121 | return -ENODEV; |
1da177e4 | 1122 | |
d550d98d | 1123 | return result; |
1da177e4 LT |
1124 | } |
1125 | ||
1da177e4 LT |
1126 | /* EC driver currently not unloadable */ |
1127 | #if 0 | |
50526df6 | 1128 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1129 | { |
1da177e4 LT |
1130 | |
1131 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
d550d98d | 1132 | return; |
1da177e4 | 1133 | } |
7843932a | 1134 | #endif /* 0 */ |