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Commit | Line | Data |
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1da177e4 | 1 | /* |
4a3f6b5b | 2 | * ec.c - ACPI Embedded Controller Driver (v2.2) |
1da177e4 | 3 | * |
4a3f6b5b LZ |
4 | * Copyright (C) 2001-2014 Intel Corporation |
5 | * Author: 2014 Lv Zheng <lv.zheng@intel.com> | |
6 | * 2006, 2007 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com> | |
7 | * 2006 Denis Sadykov <denis.m.sadykov@intel.com> | |
8 | * 2004 Luming Yu <luming.yu@intel.com> | |
9 | * 2001, 2002 Andy Grover <andrew.grover@intel.com> | |
10 | * 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> | |
11 | * Copyright (C) 2008 Alexey Starikovskiy <astarikovskiy@suse.de> | |
1da177e4 LT |
12 | * |
13 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
14 | * | |
15 | * This program is free software; you can redistribute it and/or modify | |
16 | * it under the terms of the GNU General Public License as published by | |
17 | * the Free Software Foundation; either version 2 of the License, or (at | |
18 | * your option) any later version. | |
19 | * | |
20 | * This program is distributed in the hope that it will be useful, but | |
21 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
22 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
23 | * General Public License for more details. | |
24 | * | |
25 | * You should have received a copy of the GNU General Public License along | |
26 | * with this program; if not, write to the Free Software Foundation, Inc., | |
27 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
28 | * | |
29 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
30 | */ | |
31 | ||
7c6db4e0 | 32 | /* Uncomment next line to get verbose printout */ |
d772b3b3 | 33 | /* #define DEBUG */ |
16a26e85 | 34 | #define pr_fmt(fmt) "ACPI : EC: " fmt |
d772b3b3 | 35 | |
1da177e4 LT |
36 | #include <linux/kernel.h> |
37 | #include <linux/module.h> | |
38 | #include <linux/init.h> | |
39 | #include <linux/types.h> | |
40 | #include <linux/delay.h> | |
451566f4 | 41 | #include <linux/interrupt.h> |
837012ed | 42 | #include <linux/list.h> |
7c6db4e0 | 43 | #include <linux/spinlock.h> |
5a0e3ad6 | 44 | #include <linux/slab.h> |
8b48463f | 45 | #include <linux/acpi.h> |
eb27cae8 | 46 | #include <linux/dmi.h> |
8b48463f | 47 | #include <asm/io.h> |
1da177e4 | 48 | |
1195a098 TR |
49 | #include "internal.h" |
50 | ||
1da177e4 | 51 | #define ACPI_EC_CLASS "embedded_controller" |
1da177e4 LT |
52 | #define ACPI_EC_DEVICE_NAME "Embedded Controller" |
53 | #define ACPI_EC_FILE_INFO "info" | |
837012ed | 54 | |
703959d4 | 55 | /* EC status register */ |
1da177e4 LT |
56 | #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */ |
57 | #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */ | |
dd43de20 | 58 | #define ACPI_EC_FLAG_CMD 0x08 /* Input buffer contains a command */ |
451566f4 | 59 | #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */ |
1da177e4 | 60 | #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */ |
4350933a | 61 | |
703959d4 | 62 | /* EC commands */ |
3261ff4d | 63 | enum ec_command { |
6ccedb10 AS |
64 | ACPI_EC_COMMAND_READ = 0x80, |
65 | ACPI_EC_COMMAND_WRITE = 0x81, | |
66 | ACPI_EC_BURST_ENABLE = 0x82, | |
67 | ACPI_EC_BURST_DISABLE = 0x83, | |
68 | ACPI_EC_COMMAND_QUERY = 0x84, | |
3261ff4d | 69 | }; |
837012ed | 70 | |
5c406412 | 71 | #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */ |
703959d4 | 72 | #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ |
2a84cb98 | 73 | #define ACPI_EC_MSI_UDELAY 550 /* Wait 550us for MSI EC */ |
ad332c8a KC |
74 | #define ACPI_EC_CLEAR_MAX 100 /* Maximum number of events to query |
75 | * when trying to clear the EC */ | |
703959d4 | 76 | |
080e412c | 77 | enum { |
080e412c | 78 | EC_FLAGS_QUERY_PENDING, /* Query is pending */ |
7c6db4e0 | 79 | EC_FLAGS_GPE_STORM, /* GPE storm detected */ |
f6bb13aa | 80 | EC_FLAGS_HANDLERS_INSTALLED, /* Handlers for GPE and |
7c6db4e0 | 81 | * OpReg are installed */ |
fe955682 | 82 | EC_FLAGS_BLOCKED, /* Transactions are blocked */ |
1da177e4 | 83 | }; |
6ffb221a | 84 | |
f92fca00 LZ |
85 | #define ACPI_EC_COMMAND_POLL 0x01 /* Available for command byte */ |
86 | #define ACPI_EC_COMMAND_COMPLETE 0x02 /* Completed last byte */ | |
87 | ||
7a18e96d TR |
88 | /* ec.c is compiled in acpi namespace so this shows up as acpi.ec_delay param */ |
89 | static unsigned int ec_delay __read_mostly = ACPI_EC_DELAY; | |
90 | module_param(ec_delay, uint, 0644); | |
91 | MODULE_PARM_DESC(ec_delay, "Timeout(ms) waited until an EC command completes"); | |
92 | ||
a520d52e FT |
93 | /* |
94 | * If the number of false interrupts per one transaction exceeds | |
95 | * this threshold, will think there is a GPE storm happened and | |
96 | * will disable the GPE for normal transaction. | |
97 | */ | |
98 | static unsigned int ec_storm_threshold __read_mostly = 8; | |
99 | module_param(ec_storm_threshold, uint, 0644); | |
100 | MODULE_PARM_DESC(ec_storm_threshold, "Maxim false GPE numbers not considered as GPE storm"); | |
101 | ||
837012ed AS |
102 | struct acpi_ec_query_handler { |
103 | struct list_head node; | |
104 | acpi_ec_query_func func; | |
105 | acpi_handle handle; | |
106 | void *data; | |
107 | u8 query_bit; | |
108 | }; | |
109 | ||
8463200a | 110 | struct transaction { |
7c6db4e0 AS |
111 | const u8 *wdata; |
112 | u8 *rdata; | |
113 | unsigned short irq_count; | |
8463200a | 114 | u8 command; |
a2f93aea AS |
115 | u8 wi; |
116 | u8 ri; | |
7c6db4e0 AS |
117 | u8 wlen; |
118 | u8 rlen; | |
f92fca00 | 119 | u8 flags; |
7c6db4e0 AS |
120 | }; |
121 | ||
1195a098 TR |
122 | struct acpi_ec *boot_ec, *first_ec; |
123 | EXPORT_SYMBOL(first_ec); | |
703959d4 | 124 | |
5423a0cb | 125 | static int EC_FLAGS_MSI; /* Out-of-spec MSI controller */ |
0adf3c74 | 126 | static int EC_FLAGS_VALIDATE_ECDT; /* ASUStec ECDTs need to be validated */ |
478fa03b | 127 | static int EC_FLAGS_SKIP_DSDT_SCAN; /* Not all BIOS survive early DSDT scan */ |
ad332c8a | 128 | static int EC_FLAGS_CLEAR_ON_RESUME; /* Needs acpi_ec_clear() on boot/resume */ |
5423a0cb | 129 | |
1da177e4 LT |
130 | /* -------------------------------------------------------------------------- |
131 | Transaction Management | |
132 | -------------------------------------------------------------------------- */ | |
133 | ||
6ffb221a | 134 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 135 | { |
3ebe08a7 | 136 | u8 x = inb(ec->command_addr); |
dd43de20 LZ |
137 | pr_debug("EC_SC(R) = 0x%2.2x " |
138 | "SCI_EVT=%d BURST=%d CMD=%d IBF=%d OBF=%d\n", | |
139 | x, | |
140 | !!(x & ACPI_EC_FLAG_SCI), | |
141 | !!(x & ACPI_EC_FLAG_BURST), | |
142 | !!(x & ACPI_EC_FLAG_CMD), | |
143 | !!(x & ACPI_EC_FLAG_IBF), | |
144 | !!(x & ACPI_EC_FLAG_OBF)); | |
3ebe08a7 | 145 | return x; |
451566f4 DT |
146 | } |
147 | ||
6ffb221a | 148 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 149 | { |
3ebe08a7 | 150 | u8 x = inb(ec->data_addr); |
dd43de20 | 151 | pr_debug("EC_DATA(R) = 0x%2.2x\n", x); |
7c6db4e0 | 152 | return x; |
7c6db5e5 DS |
153 | } |
154 | ||
6ffb221a | 155 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 156 | { |
dd43de20 | 157 | pr_debug("EC_SC(W) = 0x%2.2x\n", command); |
6ffb221a | 158 | outb(command, ec->command_addr); |
45bea155 LY |
159 | } |
160 | ||
6ffb221a | 161 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 162 | { |
dd43de20 | 163 | pr_debug("EC_DATA(W) = 0x%2.2x\n", data); |
6ffb221a | 164 | outb(data, ec->data_addr); |
703959d4 | 165 | } |
45bea155 | 166 | |
f92fca00 | 167 | static int ec_transaction_completed(struct acpi_ec *ec) |
6ffb221a | 168 | { |
7c6db4e0 AS |
169 | unsigned long flags; |
170 | int ret = 0; | |
f351d027 | 171 | spin_lock_irqsave(&ec->lock, flags); |
c0d65341 | 172 | if (ec->curr && (ec->curr->flags & ACPI_EC_COMMAND_COMPLETE)) |
7c6db4e0 | 173 | ret = 1; |
f351d027 | 174 | spin_unlock_irqrestore(&ec->lock, flags); |
7c6db4e0 | 175 | return ret; |
45bea155 | 176 | } |
451566f4 | 177 | |
c0d65341 | 178 | static bool advance_transaction(struct acpi_ec *ec) |
7c6db5e5 | 179 | { |
36b15875 | 180 | struct transaction *t; |
66b42b78 | 181 | u8 status; |
c0d65341 | 182 | bool wakeup = false; |
b76b51ba | 183 | |
66b42b78 LZ |
184 | pr_debug("===== %s =====\n", in_interrupt() ? "IRQ" : "TASK"); |
185 | status = acpi_ec_read_status(ec); | |
36b15875 | 186 | t = ec->curr; |
b76b51ba | 187 | if (!t) |
f92fca00 LZ |
188 | goto err; |
189 | if (t->flags & ACPI_EC_COMMAND_POLL) { | |
190 | if (t->wlen > t->wi) { | |
191 | if ((status & ACPI_EC_FLAG_IBF) == 0) | |
192 | acpi_ec_write_data(ec, t->wdata[t->wi++]); | |
193 | else | |
194 | goto err; | |
195 | } else if (t->rlen > t->ri) { | |
196 | if ((status & ACPI_EC_FLAG_OBF) == 1) { | |
197 | t->rdata[t->ri++] = acpi_ec_read_data(ec); | |
c0d65341 | 198 | if (t->rlen == t->ri) { |
f92fca00 | 199 | t->flags |= ACPI_EC_COMMAND_COMPLETE; |
3afcf2ec LZ |
200 | if (t->command == ACPI_EC_COMMAND_QUERY) |
201 | pr_debug("hardware QR_EC completion\n"); | |
c0d65341 LZ |
202 | wakeup = true; |
203 | } | |
f92fca00 LZ |
204 | } else |
205 | goto err; | |
206 | } else if (t->wlen == t->wi && | |
c0d65341 | 207 | (status & ACPI_EC_FLAG_IBF) == 0) { |
f92fca00 | 208 | t->flags |= ACPI_EC_COMMAND_COMPLETE; |
c0d65341 LZ |
209 | wakeup = true; |
210 | } | |
211 | return wakeup; | |
f92fca00 | 212 | } else { |
3afcf2ec LZ |
213 | /* |
214 | * There is firmware refusing to respond QR_EC when SCI_EVT | |
215 | * is not set, for which case, we complete the QR_EC | |
216 | * without issuing it to the firmware. | |
217 | * https://bugzilla.kernel.org/show_bug.cgi?id=86211 | |
218 | */ | |
219 | if (!(status & ACPI_EC_FLAG_SCI) && | |
220 | (t->command == ACPI_EC_COMMAND_QUERY)) { | |
221 | t->flags |= ACPI_EC_COMMAND_POLL; | |
222 | t->rdata[t->ri++] = 0x00; | |
223 | t->flags |= ACPI_EC_COMMAND_COMPLETE; | |
224 | pr_debug("software QR_EC completion\n"); | |
225 | wakeup = true; | |
226 | } else if ((status & ACPI_EC_FLAG_IBF) == 0) { | |
f92fca00 LZ |
227 | acpi_ec_write_cmd(ec, t->command); |
228 | t->flags |= ACPI_EC_COMMAND_POLL; | |
7c6db4e0 | 229 | } else |
dd15f8c4 | 230 | goto err; |
c0d65341 | 231 | return wakeup; |
f92fca00 | 232 | } |
dd15f8c4 | 233 | err: |
a3cd8d27 FT |
234 | /* |
235 | * If SCI bit is set, then don't think it's a false IRQ | |
236 | * otherwise will take a not handled IRQ as a false one. | |
237 | */ | |
f92fca00 LZ |
238 | if (!(status & ACPI_EC_FLAG_SCI)) { |
239 | if (in_interrupt() && t) | |
240 | ++t->irq_count; | |
241 | } | |
c0d65341 | 242 | return wakeup; |
f92fca00 | 243 | } |
a3cd8d27 | 244 | |
f92fca00 LZ |
245 | static void start_transaction(struct acpi_ec *ec) |
246 | { | |
247 | ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0; | |
248 | ec->curr->flags = 0; | |
c0d65341 | 249 | (void)advance_transaction(ec); |
845625cd | 250 | } |
03d1d99c | 251 | |
3eba563e | 252 | static int acpi_ec_sync_query(struct acpi_ec *ec, u8 *data); |
7c6db4e0 | 253 | |
a62e8f19 | 254 | static int ec_check_sci_sync(struct acpi_ec *ec, u8 state) |
7c6db5e5 | 255 | { |
7c6db4e0 AS |
256 | if (state & ACPI_EC_FLAG_SCI) { |
257 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) | |
3eba563e | 258 | return acpi_ec_sync_query(ec, NULL); |
7c6db4e0 AS |
259 | } |
260 | return 0; | |
261 | } | |
262 | ||
263 | static int ec_poll(struct acpi_ec *ec) | |
264 | { | |
2a84cb98 | 265 | unsigned long flags; |
28fe5c82 | 266 | int repeat = 5; /* number of command restarts */ |
2a84cb98 AS |
267 | while (repeat--) { |
268 | unsigned long delay = jiffies + | |
7a18e96d | 269 | msecs_to_jiffies(ec_delay); |
2a84cb98 AS |
270 | do { |
271 | /* don't sleep with disabled interrupts */ | |
272 | if (EC_FLAGS_MSI || irqs_disabled()) { | |
273 | udelay(ACPI_EC_MSI_UDELAY); | |
f92fca00 | 274 | if (ec_transaction_completed(ec)) |
2a84cb98 AS |
275 | return 0; |
276 | } else { | |
277 | if (wait_event_timeout(ec->wait, | |
f92fca00 | 278 | ec_transaction_completed(ec), |
2a84cb98 AS |
279 | msecs_to_jiffies(1))) |
280 | return 0; | |
281 | } | |
f92fca00 | 282 | spin_lock_irqsave(&ec->lock, flags); |
c0d65341 | 283 | (void)advance_transaction(ec); |
f92fca00 | 284 | spin_unlock_irqrestore(&ec->lock, flags); |
2a84cb98 | 285 | } while (time_before(jiffies, delay)); |
16a26e85 | 286 | pr_debug("controller reset, restart transaction\n"); |
f351d027 | 287 | spin_lock_irqsave(&ec->lock, flags); |
2a84cb98 | 288 | start_transaction(ec); |
f351d027 | 289 | spin_unlock_irqrestore(&ec->lock, flags); |
af3fd140 | 290 | } |
b77d81b2 | 291 | return -ETIME; |
1da177e4 LT |
292 | } |
293 | ||
8463200a | 294 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
2a84cb98 | 295 | struct transaction *t) |
45bea155 | 296 | { |
7c6db4e0 | 297 | unsigned long tmp; |
7c6db4e0 | 298 | int ret = 0; |
5423a0cb | 299 | if (EC_FLAGS_MSI) |
2a84cb98 | 300 | udelay(ACPI_EC_MSI_UDELAY); |
7c6db4e0 | 301 | /* start transaction */ |
f351d027 | 302 | spin_lock_irqsave(&ec->lock, tmp); |
7c6db4e0 | 303 | /* following two actions should be kept atomic */ |
8463200a | 304 | ec->curr = t; |
a2f93aea | 305 | start_transaction(ec); |
f351d027 | 306 | spin_unlock_irqrestore(&ec->lock, tmp); |
2a84cb98 | 307 | ret = ec_poll(ec); |
f351d027 | 308 | spin_lock_irqsave(&ec->lock, tmp); |
558e4736 LZ |
309 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) |
310 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); | |
8463200a | 311 | ec->curr = NULL; |
f351d027 | 312 | spin_unlock_irqrestore(&ec->lock, tmp); |
7c6db4e0 AS |
313 | return ret; |
314 | } | |
315 | ||
2a84cb98 | 316 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) |
1da177e4 | 317 | { |
d7a76e4c | 318 | int status; |
50526df6 | 319 | u32 glk; |
8463200a | 320 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
d550d98d | 321 | return -EINVAL; |
8463200a AS |
322 | if (t->rdata) |
323 | memset(t->rdata, 0, t->rlen); | |
f351d027 | 324 | mutex_lock(&ec->mutex); |
fe955682 | 325 | if (test_bit(EC_FLAGS_BLOCKED, &ec->flags)) { |
f6bb13aa RW |
326 | status = -EINVAL; |
327 | goto unlock; | |
328 | } | |
703959d4 | 329 | if (ec->global_lock) { |
1da177e4 | 330 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 331 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
332 | status = -ENODEV; |
333 | goto unlock; | |
c24e912b | 334 | } |
1da177e4 | 335 | } |
16a26e85 | 336 | pr_debug("transaction start (cmd=0x%02x, addr=0x%02x)\n", |
b76b51ba | 337 | t->command, t->wdata ? t->wdata[0] : 0); |
a62e8f19 AS |
338 | /* disable GPE during transaction if storm is detected */ |
339 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
3784730b RW |
340 | /* It has to be disabled, so that it doesn't trigger. */ |
341 | acpi_disable_gpe(NULL, ec->gpe); | |
a62e8f19 AS |
342 | } |
343 | ||
2a84cb98 | 344 | status = acpi_ec_transaction_unlocked(ec, t); |
a62e8f19 AS |
345 | |
346 | /* check if we received SCI during transaction */ | |
347 | ec_check_sci_sync(ec, acpi_ec_read_status(ec)); | |
348 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
54070101 | 349 | msleep(1); |
3784730b RW |
350 | /* It is safe to enable the GPE outside of the transaction. */ |
351 | acpi_enable_gpe(NULL, ec->gpe); | |
a520d52e | 352 | } else if (t->irq_count > ec_storm_threshold) { |
16a26e85 | 353 | pr_info("GPE storm detected(%d GPEs), " |
b76b51ba FT |
354 | "transactions will use polling mode\n", |
355 | t->irq_count); | |
a62e8f19 AS |
356 | set_bit(EC_FLAGS_GPE_STORM, &ec->flags); |
357 | } | |
16a26e85 | 358 | pr_debug("transaction end\n"); |
703959d4 | 359 | if (ec->global_lock) |
1da177e4 | 360 | acpi_release_global_lock(glk); |
7c6db4e0 | 361 | unlock: |
f351d027 | 362 | mutex_unlock(&ec->mutex); |
d550d98d | 363 | return status; |
1da177e4 LT |
364 | } |
365 | ||
8a383ef0 | 366 | static int acpi_ec_burst_enable(struct acpi_ec *ec) |
c45aac43 AS |
367 | { |
368 | u8 d; | |
8463200a AS |
369 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
370 | .wdata = NULL, .rdata = &d, | |
371 | .wlen = 0, .rlen = 1}; | |
372 | ||
2a84cb98 | 373 | return acpi_ec_transaction(ec, &t); |
c45aac43 AS |
374 | } |
375 | ||
8a383ef0 | 376 | static int acpi_ec_burst_disable(struct acpi_ec *ec) |
c45aac43 | 377 | { |
8463200a AS |
378 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
379 | .wdata = NULL, .rdata = NULL, | |
380 | .wlen = 0, .rlen = 0}; | |
381 | ||
7c6db4e0 | 382 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
2a84cb98 | 383 | acpi_ec_transaction(ec, &t) : 0; |
c45aac43 AS |
384 | } |
385 | ||
6ccedb10 | 386 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) |
3576cf61 DS |
387 | { |
388 | int result; | |
389 | u8 d; | |
8463200a AS |
390 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
391 | .wdata = &address, .rdata = &d, | |
392 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 393 | |
2a84cb98 | 394 | result = acpi_ec_transaction(ec, &t); |
3576cf61 DS |
395 | *data = d; |
396 | return result; | |
397 | } | |
6ffb221a | 398 | |
3576cf61 DS |
399 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
400 | { | |
6ccedb10 | 401 | u8 wdata[2] = { address, data }; |
8463200a AS |
402 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
403 | .wdata = wdata, .rdata = NULL, | |
404 | .wlen = 2, .rlen = 0}; | |
405 | ||
2a84cb98 | 406 | return acpi_ec_transaction(ec, &t); |
3576cf61 DS |
407 | } |
408 | ||
b76b51ba | 409 | int ec_read(u8 addr, u8 *val) |
1da177e4 | 410 | { |
1da177e4 | 411 | int err; |
6ffb221a | 412 | u8 temp_data; |
1da177e4 LT |
413 | |
414 | if (!first_ec) | |
415 | return -ENODEV; | |
416 | ||
d033879c | 417 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
418 | |
419 | if (!err) { | |
420 | *val = temp_data; | |
421 | return 0; | |
50526df6 | 422 | } else |
1da177e4 LT |
423 | return err; |
424 | } | |
50526df6 | 425 | |
1da177e4 LT |
426 | EXPORT_SYMBOL(ec_read); |
427 | ||
50526df6 | 428 | int ec_write(u8 addr, u8 val) |
1da177e4 | 429 | { |
1da177e4 LT |
430 | int err; |
431 | ||
432 | if (!first_ec) | |
433 | return -ENODEV; | |
434 | ||
d033879c | 435 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
436 | |
437 | return err; | |
438 | } | |
50526df6 | 439 | |
1da177e4 LT |
440 | EXPORT_SYMBOL(ec_write); |
441 | ||
616362de | 442 | int ec_transaction(u8 command, |
9e197219 | 443 | const u8 * wdata, unsigned wdata_len, |
1cb7b1e0 | 444 | u8 * rdata, unsigned rdata_len) |
45bea155 | 445 | { |
8463200a AS |
446 | struct transaction t = {.command = command, |
447 | .wdata = wdata, .rdata = rdata, | |
448 | .wlen = wdata_len, .rlen = rdata_len}; | |
d7a76e4c LP |
449 | if (!first_ec) |
450 | return -ENODEV; | |
45bea155 | 451 | |
2a84cb98 | 452 | return acpi_ec_transaction(first_ec, &t); |
45bea155 | 453 | } |
1da177e4 | 454 | |
ab9e43c6 LP |
455 | EXPORT_SYMBOL(ec_transaction); |
456 | ||
3e2abc5a SF |
457 | /* Get the handle to the EC device */ |
458 | acpi_handle ec_get_handle(void) | |
459 | { | |
460 | if (!first_ec) | |
461 | return NULL; | |
462 | return first_ec->handle; | |
463 | } | |
464 | ||
465 | EXPORT_SYMBOL(ec_get_handle); | |
466 | ||
ad332c8a | 467 | /* |
3eba563e | 468 | * Process _Q events that might have accumulated in the EC. |
ad332c8a KC |
469 | * Run with locked ec mutex. |
470 | */ | |
471 | static void acpi_ec_clear(struct acpi_ec *ec) | |
472 | { | |
473 | int i, status; | |
474 | u8 value = 0; | |
475 | ||
476 | for (i = 0; i < ACPI_EC_CLEAR_MAX; i++) { | |
3eba563e | 477 | status = acpi_ec_sync_query(ec, &value); |
ad332c8a KC |
478 | if (status || !value) |
479 | break; | |
480 | } | |
481 | ||
482 | if (unlikely(i == ACPI_EC_CLEAR_MAX)) | |
483 | pr_warn("Warning: Maximum of %d stale EC events cleared\n", i); | |
484 | else | |
485 | pr_info("%d stale EC events cleared\n", i); | |
486 | } | |
487 | ||
fe955682 | 488 | void acpi_ec_block_transactions(void) |
f6bb13aa RW |
489 | { |
490 | struct acpi_ec *ec = first_ec; | |
491 | ||
492 | if (!ec) | |
493 | return; | |
494 | ||
f351d027 | 495 | mutex_lock(&ec->mutex); |
f6bb13aa | 496 | /* Prevent transactions from being carried out */ |
fe955682 | 497 | set_bit(EC_FLAGS_BLOCKED, &ec->flags); |
f351d027 | 498 | mutex_unlock(&ec->mutex); |
f6bb13aa RW |
499 | } |
500 | ||
fe955682 | 501 | void acpi_ec_unblock_transactions(void) |
f6bb13aa RW |
502 | { |
503 | struct acpi_ec *ec = first_ec; | |
504 | ||
505 | if (!ec) | |
506 | return; | |
507 | ||
f351d027 | 508 | mutex_lock(&ec->mutex); |
f6bb13aa | 509 | /* Allow transactions to be carried out again */ |
fe955682 | 510 | clear_bit(EC_FLAGS_BLOCKED, &ec->flags); |
ad332c8a KC |
511 | |
512 | if (EC_FLAGS_CLEAR_ON_RESUME) | |
513 | acpi_ec_clear(ec); | |
514 | ||
f351d027 | 515 | mutex_unlock(&ec->mutex); |
f6bb13aa RW |
516 | } |
517 | ||
fe955682 | 518 | void acpi_ec_unblock_transactions_early(void) |
d5a64513 RW |
519 | { |
520 | /* | |
521 | * Allow transactions to happen again (this function is called from | |
522 | * atomic context during wakeup, so we don't need to acquire the mutex). | |
523 | */ | |
524 | if (first_ec) | |
fe955682 | 525 | clear_bit(EC_FLAGS_BLOCKED, &first_ec->flags); |
d5a64513 RW |
526 | } |
527 | ||
a62e8f19 | 528 | static int acpi_ec_query_unlocked(struct acpi_ec *ec, u8 * data) |
3576cf61 DS |
529 | { |
530 | int result; | |
6ccedb10 | 531 | u8 d; |
8463200a AS |
532 | struct transaction t = {.command = ACPI_EC_COMMAND_QUERY, |
533 | .wdata = NULL, .rdata = &d, | |
534 | .wlen = 0, .rlen = 1}; | |
6ccedb10 AS |
535 | if (!ec || !data) |
536 | return -EINVAL; | |
6ccedb10 AS |
537 | /* |
538 | * Query the EC to find out which _Qxx method we need to evaluate. | |
539 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
540 | * bit to be cleared (and thus clearing the interrupt source). | |
541 | */ | |
a62e8f19 | 542 | result = acpi_ec_transaction_unlocked(ec, &t); |
6ccedb10 AS |
543 | if (result) |
544 | return result; | |
6ccedb10 AS |
545 | if (!d) |
546 | return -ENODATA; | |
6ccedb10 AS |
547 | *data = d; |
548 | return 0; | |
1da177e4 LT |
549 | } |
550 | ||
1da177e4 LT |
551 | /* -------------------------------------------------------------------------- |
552 | Event Management | |
553 | -------------------------------------------------------------------------- */ | |
837012ed AS |
554 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
555 | acpi_handle handle, acpi_ec_query_func func, | |
556 | void *data) | |
557 | { | |
558 | struct acpi_ec_query_handler *handler = | |
559 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
560 | if (!handler) | |
561 | return -ENOMEM; | |
562 | ||
563 | handler->query_bit = query_bit; | |
564 | handler->handle = handle; | |
565 | handler->func = func; | |
566 | handler->data = data; | |
f351d027 | 567 | mutex_lock(&ec->mutex); |
30c08574 | 568 | list_add(&handler->node, &ec->list); |
f351d027 | 569 | mutex_unlock(&ec->mutex); |
837012ed AS |
570 | return 0; |
571 | } | |
572 | ||
573 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); | |
574 | ||
575 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
576 | { | |
1544fdbc | 577 | struct acpi_ec_query_handler *handler, *tmp; |
f351d027 | 578 | mutex_lock(&ec->mutex); |
1544fdbc | 579 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
580 | if (query_bit == handler->query_bit) { |
581 | list_del(&handler->node); | |
582 | kfree(handler); | |
837012ed AS |
583 | } |
584 | } | |
f351d027 | 585 | mutex_unlock(&ec->mutex); |
837012ed AS |
586 | } |
587 | ||
588 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); | |
1da177e4 | 589 | |
a62e8f19 | 590 | static void acpi_ec_run(void *cxt) |
45bea155 | 591 | { |
a62e8f19 AS |
592 | struct acpi_ec_query_handler *handler = cxt; |
593 | if (!handler) | |
e41334c0 | 594 | return; |
16a26e85 | 595 | pr_debug("start query execution\n"); |
a62e8f19 AS |
596 | if (handler->func) |
597 | handler->func(handler->data); | |
598 | else if (handler->handle) | |
599 | acpi_evaluate_object(handler->handle, NULL, NULL, NULL); | |
16a26e85 | 600 | pr_debug("stop query execution\n"); |
a62e8f19 AS |
601 | kfree(handler); |
602 | } | |
603 | ||
3eba563e | 604 | static int acpi_ec_sync_query(struct acpi_ec *ec, u8 *data) |
a62e8f19 AS |
605 | { |
606 | u8 value = 0; | |
607 | int status; | |
608 | struct acpi_ec_query_handler *handler, *copy; | |
3eba563e KC |
609 | |
610 | status = acpi_ec_query_unlocked(ec, &value); | |
611 | if (data) | |
612 | *data = value; | |
613 | if (status) | |
a62e8f19 | 614 | return status; |
3eba563e | 615 | |
837012ed AS |
616 | list_for_each_entry(handler, &ec->list, node) { |
617 | if (value == handler->query_bit) { | |
618 | /* have custom handler for this bit */ | |
a62e8f19 AS |
619 | copy = kmalloc(sizeof(*handler), GFP_KERNEL); |
620 | if (!copy) | |
621 | return -ENOMEM; | |
622 | memcpy(copy, handler, sizeof(*copy)); | |
16a26e85 LT |
623 | pr_debug("push query execution (0x%2x) on queue\n", |
624 | value); | |
f5347867 AS |
625 | return acpi_os_execute((copy->func) ? |
626 | OSL_NOTIFY_HANDLER : OSL_GPE_HANDLER, | |
a62e8f19 | 627 | acpi_ec_run, copy); |
837012ed AS |
628 | } |
629 | } | |
a62e8f19 AS |
630 | return 0; |
631 | } | |
632 | ||
633 | static void acpi_ec_gpe_query(void *ec_cxt) | |
634 | { | |
635 | struct acpi_ec *ec = ec_cxt; | |
636 | if (!ec) | |
637 | return; | |
f351d027 | 638 | mutex_lock(&ec->mutex); |
3eba563e | 639 | acpi_ec_sync_query(ec, NULL); |
f351d027 | 640 | mutex_unlock(&ec->mutex); |
45bea155 | 641 | } |
1da177e4 | 642 | |
a62e8f19 AS |
643 | static int ec_check_sci(struct acpi_ec *ec, u8 state) |
644 | { | |
645 | if (state & ACPI_EC_FLAG_SCI) { | |
646 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) { | |
16a26e85 | 647 | pr_debug("push gpe query to the queue\n"); |
a62e8f19 AS |
648 | return acpi_os_execute(OSL_NOTIFY_HANDLER, |
649 | acpi_ec_gpe_query, ec); | |
650 | } | |
651 | } | |
652 | return 0; | |
653 | } | |
654 | ||
8b6cd8ad LM |
655 | static u32 acpi_ec_gpe_handler(acpi_handle gpe_device, |
656 | u32 gpe_number, void *data) | |
1da177e4 | 657 | { |
f92fca00 | 658 | unsigned long flags; |
3d02b90b | 659 | struct acpi_ec *ec = data; |
7c6db4e0 | 660 | |
f92fca00 | 661 | spin_lock_irqsave(&ec->lock, flags); |
c0d65341 | 662 | if (advance_transaction(ec)) |
2a84cb98 | 663 | wake_up(&ec->wait); |
c0d65341 LZ |
664 | spin_unlock_irqrestore(&ec->lock, flags); |
665 | ec_check_sci(ec, acpi_ec_read_status(ec)); | |
bba63a29 | 666 | return ACPI_INTERRUPT_HANDLED | ACPI_REENABLE_GPE; |
845625cd AS |
667 | } |
668 | ||
1da177e4 LT |
669 | /* -------------------------------------------------------------------------- |
670 | Address Space Management | |
671 | -------------------------------------------------------------------------- */ | |
672 | ||
1da177e4 | 673 | static acpi_status |
5b7734b4 | 674 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
dadf28a1 | 675 | u32 bits, u64 *value64, |
50526df6 | 676 | void *handler_context, void *region_context) |
1da177e4 | 677 | { |
3d02b90b | 678 | struct acpi_ec *ec = handler_context; |
dadf28a1 AS |
679 | int result = 0, i, bytes = bits / 8; |
680 | u8 *value = (u8 *)value64; | |
1da177e4 | 681 | |
1da177e4 | 682 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 683 | return AE_BAD_PARAMETER; |
1da177e4 | 684 | |
5b7734b4 | 685 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 686 | return AE_BAD_PARAMETER; |
1da177e4 | 687 | |
dadf28a1 | 688 | if (EC_FLAGS_MSI || bits > 8) |
6a63b06f | 689 | acpi_ec_burst_enable(ec); |
b3b233c7 | 690 | |
dadf28a1 AS |
691 | for (i = 0; i < bytes; ++i, ++address, ++value) |
692 | result = (function == ACPI_READ) ? | |
693 | acpi_ec_read(ec, address, value) : | |
694 | acpi_ec_write(ec, address, *value); | |
1da177e4 | 695 | |
dadf28a1 | 696 | if (EC_FLAGS_MSI || bits > 8) |
6a63b06f | 697 | acpi_ec_burst_disable(ec); |
b3b233c7 | 698 | |
1da177e4 LT |
699 | switch (result) { |
700 | case -EINVAL: | |
d550d98d | 701 | return AE_BAD_PARAMETER; |
1da177e4 LT |
702 | break; |
703 | case -ENODEV: | |
d550d98d | 704 | return AE_NOT_FOUND; |
1da177e4 LT |
705 | break; |
706 | case -ETIME: | |
d550d98d | 707 | return AE_TIME; |
1da177e4 LT |
708 | break; |
709 | default: | |
d550d98d | 710 | return AE_OK; |
1da177e4 | 711 | } |
1da177e4 LT |
712 | } |
713 | ||
1da177e4 LT |
714 | /* -------------------------------------------------------------------------- |
715 | Driver Interface | |
716 | -------------------------------------------------------------------------- */ | |
c0900c35 AS |
717 | static acpi_status |
718 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
719 | ||
c0900c35 AS |
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; | |
080e412c | 725 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
f351d027 | 726 | mutex_init(&ec->mutex); |
c0900c35 | 727 | init_waitqueue_head(&ec->wait); |
837012ed | 728 | INIT_LIST_HEAD(&ec->list); |
f351d027 | 729 | spin_lock_init(&ec->lock); |
c0900c35 AS |
730 | return ec; |
731 | } | |
837012ed | 732 | |
c019b193 AS |
733 | static acpi_status |
734 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
735 | void *context, void **return_value) | |
736 | { | |
0175d562 LM |
737 | char node_name[5]; |
738 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
c019b193 AS |
739 | struct acpi_ec *ec = context; |
740 | int value = 0; | |
0175d562 LM |
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) { | |
c019b193 AS |
746 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
747 | } | |
748 | return AE_OK; | |
749 | } | |
750 | ||
cd8c93a4 AS |
751 | static acpi_status |
752 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 753 | { |
cd8c93a4 | 754 | acpi_status status; |
d21cf3c1 | 755 | unsigned long long tmp = 0; |
cd8c93a4 AS |
756 | |
757 | struct acpi_ec *ec = context; | |
a5032bfd AS |
758 | |
759 | /* clear addr values, ec_parse_io_ports depend on it */ | |
760 | ec->command_addr = ec->data_addr = 0; | |
761 | ||
cd8c93a4 AS |
762 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
763 | ec_parse_io_ports, ec); | |
764 | if (ACPI_FAILURE(status)) | |
765 | return status; | |
837012ed AS |
766 | |
767 | /* Get GPE bit assignment (EC events). */ | |
768 | /* TODO: Add support for _GPE returning a package */ | |
27663c58 | 769 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
cd8c93a4 AS |
770 | if (ACPI_FAILURE(status)) |
771 | return status; | |
27663c58 | 772 | ec->gpe = tmp; |
837012ed | 773 | /* Use the global lock for all EC transactions? */ |
d21cf3c1 | 774 | tmp = 0; |
27663c58 MW |
775 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
776 | ec->global_lock = tmp; | |
837012ed | 777 | ec->handle = handle; |
cd8c93a4 | 778 | return AE_CTRL_TERMINATE; |
837012ed AS |
779 | } |
780 | ||
5efc5476 BH |
781 | static int ec_install_handlers(struct acpi_ec *ec) |
782 | { | |
783 | acpi_status status; | |
784 | if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) | |
785 | return 0; | |
786 | status = acpi_install_gpe_handler(NULL, ec->gpe, | |
787 | ACPI_GPE_EDGE_TRIGGERED, | |
788 | &acpi_ec_gpe_handler, ec); | |
789 | if (ACPI_FAILURE(status)) | |
790 | return -ENODEV; | |
9630bdd9 | 791 | |
a44061aa | 792 | acpi_enable_gpe(NULL, ec->gpe); |
5efc5476 BH |
793 | status = acpi_install_address_space_handler(ec->handle, |
794 | ACPI_ADR_SPACE_EC, | |
795 | &acpi_ec_space_handler, | |
796 | NULL, ec); | |
797 | if (ACPI_FAILURE(status)) { | |
798 | if (status == AE_NOT_FOUND) { | |
799 | /* | |
800 | * Maybe OS fails in evaluating the _REG object. | |
801 | * The AE_NOT_FOUND error will be ignored and OS | |
802 | * continue to initialize EC. | |
803 | */ | |
16a26e85 | 804 | pr_err("Fail in evaluating the _REG object" |
5efc5476 BH |
805 | " of EC device. Broken bios is suspected.\n"); |
806 | } else { | |
42b946bb | 807 | acpi_disable_gpe(NULL, ec->gpe); |
5efc5476 BH |
808 | acpi_remove_gpe_handler(NULL, ec->gpe, |
809 | &acpi_ec_gpe_handler); | |
810 | return -ENODEV; | |
811 | } | |
812 | } | |
813 | ||
814 | set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); | |
815 | return 0; | |
816 | } | |
817 | ||
4c611060 AS |
818 | static void ec_remove_handlers(struct acpi_ec *ec) |
819 | { | |
a44061aa | 820 | acpi_disable_gpe(NULL, ec->gpe); |
4c611060 AS |
821 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, |
822 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
16a26e85 | 823 | pr_err("failed to remove space handler\n"); |
4c611060 AS |
824 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
825 | &acpi_ec_gpe_handler))) | |
16a26e85 | 826 | pr_err("failed to remove gpe handler\n"); |
7c6db4e0 | 827 | clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
4c611060 AS |
828 | } |
829 | ||
703959d4 | 830 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 831 | { |
703959d4 | 832 | struct acpi_ec *ec = NULL; |
d02be047 | 833 | int ret; |
45bea155 | 834 | |
c0900c35 AS |
835 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
836 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
837 | ||
4c611060 | 838 | /* Check for boot EC */ |
ce52ddf5 AS |
839 | if (boot_ec && |
840 | (boot_ec->handle == device->handle || | |
841 | boot_ec->handle == ACPI_ROOT_OBJECT)) { | |
842 | ec = boot_ec; | |
843 | boot_ec = NULL; | |
844 | } else { | |
845 | ec = make_acpi_ec(); | |
846 | if (!ec) | |
847 | return -ENOMEM; | |
a5032bfd AS |
848 | } |
849 | if (ec_parse_device(device->handle, 0, ec, NULL) != | |
850 | AE_CTRL_TERMINATE) { | |
ce52ddf5 AS |
851 | kfree(ec); |
852 | return -EINVAL; | |
4c611060 AS |
853 | } |
854 | ||
ce52ddf5 AS |
855 | /* Find and register all query methods */ |
856 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
2263576c | 857 | acpi_ec_register_query_methods, NULL, ec, NULL); |
ce52ddf5 | 858 | |
4c611060 AS |
859 | if (!first_ec) |
860 | first_ec = ec; | |
db89b4f0 | 861 | device->driver_data = ec; |
de4f1046 | 862 | |
d6795fe3 AK |
863 | ret = !!request_region(ec->data_addr, 1, "EC data"); |
864 | WARN(!ret, "Could not request EC data io port 0x%lx", ec->data_addr); | |
865 | ret = !!request_region(ec->command_addr, 1, "EC cmd"); | |
866 | WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr); | |
de4f1046 | 867 | |
16a26e85 | 868 | pr_info("GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 869 | ec->gpe, ec->command_addr, ec->data_addr); |
5efc5476 BH |
870 | |
871 | ret = ec_install_handlers(ec); | |
872 | ||
873 | /* EC is fully operational, allow queries */ | |
874 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); | |
ad332c8a KC |
875 | |
876 | /* Clear stale _Q events if hardware might require that */ | |
877 | if (EC_FLAGS_CLEAR_ON_RESUME) { | |
878 | mutex_lock(&ec->mutex); | |
879 | acpi_ec_clear(ec); | |
880 | mutex_unlock(&ec->mutex); | |
881 | } | |
5efc5476 | 882 | return ret; |
1da177e4 LT |
883 | } |
884 | ||
51fac838 | 885 | static int acpi_ec_remove(struct acpi_device *device) |
1da177e4 | 886 | { |
01f22462 | 887 | struct acpi_ec *ec; |
07ddf768 | 888 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 889 | |
1da177e4 | 890 | if (!device) |
d550d98d | 891 | return -EINVAL; |
1da177e4 LT |
892 | |
893 | ec = acpi_driver_data(device); | |
cf745ec7 | 894 | ec_remove_handlers(ec); |
f351d027 | 895 | mutex_lock(&ec->mutex); |
07ddf768 | 896 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
897 | list_del(&handler->node); |
898 | kfree(handler); | |
899 | } | |
f351d027 | 900 | mutex_unlock(&ec->mutex); |
de4f1046 TR |
901 | release_region(ec->data_addr, 1); |
902 | release_region(ec->command_addr, 1); | |
db89b4f0 | 903 | device->driver_data = NULL; |
d033879c | 904 | if (ec == first_ec) |
c0900c35 | 905 | first_ec = NULL; |
4c611060 | 906 | kfree(ec); |
d550d98d | 907 | return 0; |
1da177e4 LT |
908 | } |
909 | ||
1da177e4 | 910 | static acpi_status |
c0900c35 | 911 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 912 | { |
3d02b90b | 913 | struct acpi_ec *ec = context; |
1da177e4 | 914 | |
01f22462 | 915 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 916 | return AE_OK; |
1da177e4 LT |
917 | |
918 | /* | |
919 | * The first address region returned is the data port, and | |
920 | * the second address region returned is the status/command | |
921 | * port. | |
922 | */ | |
de4f1046 | 923 | if (ec->data_addr == 0) |
6ffb221a | 924 | ec->data_addr = resource->data.io.minimum; |
de4f1046 | 925 | else if (ec->command_addr == 0) |
6ffb221a | 926 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 927 | else |
1da177e4 | 928 | return AE_CTRL_TERMINATE; |
1da177e4 | 929 | |
1da177e4 LT |
930 | return AE_OK; |
931 | } | |
932 | ||
c04209a7 AS |
933 | int __init acpi_boot_ec_enable(void) |
934 | { | |
7c6db4e0 | 935 | if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags)) |
c04209a7 AS |
936 | return 0; |
937 | if (!ec_install_handlers(boot_ec)) { | |
938 | first_ec = boot_ec; | |
939 | return 0; | |
940 | } | |
941 | return -EFAULT; | |
942 | } | |
943 | ||
223883b7 AS |
944 | static const struct acpi_device_id ec_device_ids[] = { |
945 | {"PNP0C09", 0}, | |
946 | {"", 0}, | |
947 | }; | |
948 | ||
478fa03b AS |
949 | /* Some BIOS do not survive early DSDT scan, skip it */ |
950 | static int ec_skip_dsdt_scan(const struct dmi_system_id *id) | |
951 | { | |
952 | EC_FLAGS_SKIP_DSDT_SCAN = 1; | |
953 | return 0; | |
954 | } | |
955 | ||
0adf3c74 AS |
956 | /* ASUStek often supplies us with broken ECDT, validate it */ |
957 | static int ec_validate_ecdt(const struct dmi_system_id *id) | |
958 | { | |
959 | EC_FLAGS_VALIDATE_ECDT = 1; | |
960 | return 0; | |
961 | } | |
962 | ||
963 | /* MSI EC needs special treatment, enable it */ | |
964 | static int ec_flag_msi(const struct dmi_system_id *id) | |
965 | { | |
16a26e85 | 966 | pr_debug("Detected MSI hardware, enabling workarounds.\n"); |
0adf3c74 AS |
967 | EC_FLAGS_MSI = 1; |
968 | EC_FLAGS_VALIDATE_ECDT = 1; | |
969 | return 0; | |
970 | } | |
971 | ||
67bfa9b6 FT |
972 | /* |
973 | * Clevo M720 notebook actually works ok with IRQ mode, if we lifted | |
974 | * the GPE storm threshold back to 20 | |
975 | */ | |
976 | static int ec_enlarge_storm_threshold(const struct dmi_system_id *id) | |
977 | { | |
978 | pr_debug("Setting the EC GPE storm threshold to 20\n"); | |
979 | ec_storm_threshold = 20; | |
980 | return 0; | |
981 | } | |
982 | ||
ad332c8a KC |
983 | /* |
984 | * On some hardware it is necessary to clear events accumulated by the EC during | |
985 | * sleep. These ECs stop reporting GPEs until they are manually polled, if too | |
986 | * many events are accumulated. (e.g. Samsung Series 5/9 notebooks) | |
987 | * | |
988 | * https://bugzilla.kernel.org/show_bug.cgi?id=44161 | |
989 | * | |
990 | * Ideally, the EC should also be instructed NOT to accumulate events during | |
991 | * sleep (which Windows seems to do somehow), but the interface to control this | |
992 | * behaviour is not known at this time. | |
993 | * | |
994 | * Models known to be affected are Samsung 530Uxx/535Uxx/540Uxx/550Pxx/900Xxx, | |
995 | * however it is very likely that other Samsung models are affected. | |
996 | * | |
997 | * On systems which don't accumulate _Q events during sleep, this extra check | |
998 | * should be harmless. | |
999 | */ | |
1000 | static int ec_clear_on_resume(const struct dmi_system_id *id) | |
1001 | { | |
1002 | pr_debug("Detected system needing EC poll on resume.\n"); | |
1003 | EC_FLAGS_CLEAR_ON_RESUME = 1; | |
1004 | return 0; | |
1005 | } | |
1006 | ||
6cef7497 | 1007 | static struct dmi_system_id ec_dmi_table[] __initdata = { |
478fa03b AS |
1008 | { |
1009 | ec_skip_dsdt_scan, "Compal JFL92", { | |
1010 | DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"), | |
1011 | DMI_MATCH(DMI_BOARD_NAME, "JFL92") }, NULL}, | |
0adf3c74 AS |
1012 | { |
1013 | ec_flag_msi, "MSI hardware", { | |
55b313f2 AS |
1014 | DMI_MATCH(DMI_BIOS_VENDOR, "Micro-Star")}, NULL}, |
1015 | { | |
1016 | ec_flag_msi, "MSI hardware", { | |
1017 | DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star")}, NULL}, | |
1018 | { | |
1019 | ec_flag_msi, "MSI hardware", { | |
1020 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-Star")}, NULL}, | |
0adf3c74 | 1021 | { |
a5dc4f89 AS |
1022 | ec_flag_msi, "MSI hardware", { |
1023 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-STAR")}, NULL}, | |
1024 | { | |
534bc4e3 ZR |
1025 | ec_flag_msi, "Quanta hardware", { |
1026 | DMI_MATCH(DMI_SYS_VENDOR, "Quanta"), | |
1027 | DMI_MATCH(DMI_PRODUCT_NAME, "TW8/SW8/DW8"),}, NULL}, | |
1028 | { | |
1029 | ec_flag_msi, "Quanta hardware", { | |
1030 | DMI_MATCH(DMI_SYS_VENDOR, "Quanta"), | |
1031 | DMI_MATCH(DMI_PRODUCT_NAME, "TW9/SW9"),}, NULL}, | |
1032 | { | |
0adf3c74 AS |
1033 | ec_validate_ecdt, "ASUS hardware", { |
1034 | DMI_MATCH(DMI_BIOS_VENDOR, "ASUS") }, NULL}, | |
af986d10 PC |
1035 | { |
1036 | ec_validate_ecdt, "ASUS hardware", { | |
1037 | DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc.") }, NULL}, | |
67bfa9b6 FT |
1038 | { |
1039 | ec_enlarge_storm_threshold, "CLEVO hardware", { | |
1040 | DMI_MATCH(DMI_SYS_VENDOR, "CLEVO Co."), | |
1041 | DMI_MATCH(DMI_PRODUCT_NAME, "M720T/M730T"),}, NULL}, | |
eff9a4b6 LT |
1042 | { |
1043 | ec_skip_dsdt_scan, "HP Folio 13", { | |
1044 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), | |
1045 | DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13"),}, NULL}, | |
524f42fa LT |
1046 | { |
1047 | ec_validate_ecdt, "ASUS hardware", { | |
1048 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTek Computer Inc."), | |
1049 | DMI_MATCH(DMI_PRODUCT_NAME, "L4R"),}, NULL}, | |
ad332c8a KC |
1050 | { |
1051 | ec_clear_on_resume, "Samsung hardware", { | |
1052 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD.")}, NULL}, | |
0adf3c74 AS |
1053 | {}, |
1054 | }; | |
1055 | ||
c0900c35 AS |
1056 | int __init acpi_ec_ecdt_probe(void) |
1057 | { | |
c0900c35 | 1058 | acpi_status status; |
c6cb0e87 | 1059 | struct acpi_ec *saved_ec = NULL; |
50526df6 | 1060 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 1061 | |
d66d969d AS |
1062 | boot_ec = make_acpi_ec(); |
1063 | if (!boot_ec) | |
c0900c35 AS |
1064 | return -ENOMEM; |
1065 | /* | |
1066 | * Generate a boot ec context | |
1067 | */ | |
0adf3c74 | 1068 | dmi_check_system(ec_dmi_table); |
15a58ed1 AS |
1069 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
1070 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 1071 | if (ACPI_SUCCESS(status)) { |
16a26e85 | 1072 | pr_info("EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
1073 | boot_ec->command_addr = ecdt_ptr->control.address; |
1074 | boot_ec->data_addr = ecdt_ptr->data.address; | |
1075 | boot_ec->gpe = ecdt_ptr->gpe; | |
4af8e10a | 1076 | boot_ec->handle = ACPI_ROOT_OBJECT; |
ce52ddf5 | 1077 | acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle); |
c6cb0e87 | 1078 | /* Don't trust ECDT, which comes from ASUSTek */ |
0adf3c74 | 1079 | if (!EC_FLAGS_VALIDATE_ECDT) |
c5279dee | 1080 | goto install; |
d6bd535d | 1081 | saved_ec = kmemdup(boot_ec, sizeof(struct acpi_ec), GFP_KERNEL); |
c6cb0e87 AS |
1082 | if (!saved_ec) |
1083 | return -ENOMEM; | |
c5279dee | 1084 | /* fall through */ |
cd8c93a4 | 1085 | } |
0adf3c74 | 1086 | |
ed4b197d CIK |
1087 | if (EC_FLAGS_SKIP_DSDT_SCAN) { |
1088 | kfree(saved_ec); | |
478fa03b | 1089 | return -ENODEV; |
ed4b197d | 1090 | } |
478fa03b | 1091 | |
c5279dee AS |
1092 | /* This workaround is needed only on some broken machines, |
1093 | * which require early EC, but fail to provide ECDT */ | |
16a26e85 | 1094 | pr_debug("Look up EC in DSDT\n"); |
c5279dee AS |
1095 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, |
1096 | boot_ec, NULL); | |
1097 | /* Check that acpi_get_devices actually find something */ | |
1098 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
1099 | goto error; | |
c6cb0e87 AS |
1100 | if (saved_ec) { |
1101 | /* try to find good ECDT from ASUSTek */ | |
1102 | if (saved_ec->command_addr != boot_ec->command_addr || | |
1103 | saved_ec->data_addr != boot_ec->data_addr || | |
1104 | saved_ec->gpe != boot_ec->gpe || | |
1105 | saved_ec->handle != boot_ec->handle) | |
16a26e85 | 1106 | pr_info("ASUSTek keeps feeding us with broken " |
c6cb0e87 AS |
1107 | "ECDT tables, which are very hard to workaround. " |
1108 | "Trying to use DSDT EC info instead. Please send " | |
1109 | "output of acpidump to linux-acpi@vger.kernel.org\n"); | |
1110 | kfree(saved_ec); | |
1111 | saved_ec = NULL; | |
1112 | } else { | |
1113 | /* We really need to limit this workaround, the only ASUS, | |
1114 | * which needs it, has fake EC._INI method, so use it as flag. | |
1115 | * Keep boot_ec struct as it will be needed soon. | |
1116 | */ | |
c6cb0e87 | 1117 | if (!dmi_name_in_vendors("ASUS") || |
952c63e9 | 1118 | !acpi_has_method(boot_ec->handle, "_INI")) |
c6cb0e87 AS |
1119 | return -ENODEV; |
1120 | } | |
c5279dee AS |
1121 | install: |
1122 | if (!ec_install_handlers(boot_ec)) { | |
d033879c | 1123 | first_ec = boot_ec; |
e8284321 | 1124 | return 0; |
d033879c | 1125 | } |
c5279dee | 1126 | error: |
d66d969d | 1127 | kfree(boot_ec); |
ed4b197d | 1128 | kfree(saved_ec); |
d66d969d | 1129 | boot_ec = NULL; |
1da177e4 LT |
1130 | return -ENODEV; |
1131 | } | |
1132 | ||
223883b7 AS |
1133 | static struct acpi_driver acpi_ec_driver = { |
1134 | .name = "ec", | |
1135 | .class = ACPI_EC_CLASS, | |
1136 | .ids = ec_device_ids, | |
1137 | .ops = { | |
1138 | .add = acpi_ec_add, | |
1139 | .remove = acpi_ec_remove, | |
223883b7 AS |
1140 | }, |
1141 | }; | |
1142 | ||
a5f820fe | 1143 | int __init acpi_ec_init(void) |
1da177e4 | 1144 | { |
50526df6 | 1145 | int result = 0; |
1da177e4 | 1146 | |
1da177e4 LT |
1147 | /* Now register the driver for the EC */ |
1148 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
49c6c5ff | 1149 | if (result < 0) |
d550d98d | 1150 | return -ENODEV; |
1da177e4 | 1151 | |
d550d98d | 1152 | return result; |
1da177e4 LT |
1153 | } |
1154 | ||
1da177e4 LT |
1155 | /* EC driver currently not unloadable */ |
1156 | #if 0 | |
50526df6 | 1157 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1158 | { |
1da177e4 LT |
1159 | |
1160 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
d550d98d | 1161 | return; |
1da177e4 | 1162 | } |
7843932a | 1163 | #endif /* 0 */ |