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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 | 130 | /* -------------------------------------------------------------------------- |
7a73e60e LZ |
131 | * Transaction Management |
132 | * -------------------------------------------------------------------------- */ | |
1da177e4 | 133 | |
6ffb221a | 134 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 135 | { |
3ebe08a7 | 136 | u8 x = inb(ec->command_addr); |
7a73e60e | 137 | |
dd43de20 LZ |
138 | pr_debug("EC_SC(R) = 0x%2.2x " |
139 | "SCI_EVT=%d BURST=%d CMD=%d IBF=%d OBF=%d\n", | |
140 | x, | |
141 | !!(x & ACPI_EC_FLAG_SCI), | |
142 | !!(x & ACPI_EC_FLAG_BURST), | |
143 | !!(x & ACPI_EC_FLAG_CMD), | |
144 | !!(x & ACPI_EC_FLAG_IBF), | |
145 | !!(x & ACPI_EC_FLAG_OBF)); | |
3ebe08a7 | 146 | return x; |
451566f4 DT |
147 | } |
148 | ||
6ffb221a | 149 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 150 | { |
3ebe08a7 | 151 | u8 x = inb(ec->data_addr); |
7a73e60e | 152 | |
dd43de20 | 153 | pr_debug("EC_DATA(R) = 0x%2.2x\n", x); |
7c6db4e0 | 154 | return x; |
7c6db5e5 DS |
155 | } |
156 | ||
6ffb221a | 157 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 158 | { |
dd43de20 | 159 | pr_debug("EC_SC(W) = 0x%2.2x\n", command); |
6ffb221a | 160 | outb(command, ec->command_addr); |
45bea155 LY |
161 | } |
162 | ||
6ffb221a | 163 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 164 | { |
dd43de20 | 165 | pr_debug("EC_DATA(W) = 0x%2.2x\n", data); |
6ffb221a | 166 | outb(data, ec->data_addr); |
703959d4 | 167 | } |
45bea155 | 168 | |
e34c0e2b LZ |
169 | #ifdef DEBUG |
170 | static const char *acpi_ec_cmd_string(u8 cmd) | |
171 | { | |
172 | switch (cmd) { | |
173 | case 0x80: | |
174 | return "RD_EC"; | |
175 | case 0x81: | |
176 | return "WR_EC"; | |
177 | case 0x82: | |
178 | return "BE_EC"; | |
179 | case 0x83: | |
180 | return "BD_EC"; | |
181 | case 0x84: | |
182 | return "QR_EC"; | |
183 | } | |
184 | return "UNKNOWN"; | |
185 | } | |
186 | #else | |
187 | #define acpi_ec_cmd_string(cmd) "UNDEF" | |
188 | #endif | |
189 | ||
f92fca00 | 190 | static int ec_transaction_completed(struct acpi_ec *ec) |
6ffb221a | 191 | { |
7c6db4e0 AS |
192 | unsigned long flags; |
193 | int ret = 0; | |
7a73e60e | 194 | |
f351d027 | 195 | spin_lock_irqsave(&ec->lock, flags); |
c0d65341 | 196 | if (ec->curr && (ec->curr->flags & ACPI_EC_COMMAND_COMPLETE)) |
7c6db4e0 | 197 | ret = 1; |
f351d027 | 198 | spin_unlock_irqrestore(&ec->lock, flags); |
7c6db4e0 | 199 | return ret; |
45bea155 | 200 | } |
451566f4 | 201 | |
c0d65341 | 202 | static bool advance_transaction(struct acpi_ec *ec) |
7c6db5e5 | 203 | { |
36b15875 | 204 | struct transaction *t; |
66b42b78 | 205 | u8 status; |
c0d65341 | 206 | bool wakeup = false; |
b76b51ba | 207 | |
c95f25b0 LZ |
208 | pr_debug("===== %s (%d) =====\n", |
209 | in_interrupt() ? "IRQ" : "TASK", smp_processor_id()); | |
66b42b78 | 210 | status = acpi_ec_read_status(ec); |
36b15875 | 211 | t = ec->curr; |
b76b51ba | 212 | if (!t) |
f92fca00 LZ |
213 | goto err; |
214 | if (t->flags & ACPI_EC_COMMAND_POLL) { | |
215 | if (t->wlen > t->wi) { | |
216 | if ((status & ACPI_EC_FLAG_IBF) == 0) | |
217 | acpi_ec_write_data(ec, t->wdata[t->wi++]); | |
218 | else | |
219 | goto err; | |
220 | } else if (t->rlen > t->ri) { | |
221 | if ((status & ACPI_EC_FLAG_OBF) == 1) { | |
222 | t->rdata[t->ri++] = acpi_ec_read_data(ec); | |
c0d65341 | 223 | if (t->rlen == t->ri) { |
f92fca00 | 224 | t->flags |= ACPI_EC_COMMAND_COMPLETE; |
3afcf2ec | 225 | if (t->command == ACPI_EC_COMMAND_QUERY) |
e34c0e2b LZ |
226 | pr_debug("***** Command(%s) hardware completion *****\n", |
227 | acpi_ec_cmd_string(t->command)); | |
c0d65341 LZ |
228 | wakeup = true; |
229 | } | |
f92fca00 LZ |
230 | } else |
231 | goto err; | |
232 | } else if (t->wlen == t->wi && | |
c0d65341 | 233 | (status & ACPI_EC_FLAG_IBF) == 0) { |
f92fca00 | 234 | t->flags |= ACPI_EC_COMMAND_COMPLETE; |
c0d65341 LZ |
235 | wakeup = true; |
236 | } | |
237 | return wakeup; | |
f92fca00 | 238 | } else { |
3afcf2ec LZ |
239 | /* |
240 | * There is firmware refusing to respond QR_EC when SCI_EVT | |
241 | * is not set, for which case, we complete the QR_EC | |
242 | * without issuing it to the firmware. | |
243 | * https://bugzilla.kernel.org/show_bug.cgi?id=86211 | |
244 | */ | |
245 | if (!(status & ACPI_EC_FLAG_SCI) && | |
246 | (t->command == ACPI_EC_COMMAND_QUERY)) { | |
247 | t->flags |= ACPI_EC_COMMAND_POLL; | |
248 | t->rdata[t->ri++] = 0x00; | |
249 | t->flags |= ACPI_EC_COMMAND_COMPLETE; | |
e34c0e2b LZ |
250 | pr_debug("***** Command(%s) software completion *****\n", |
251 | acpi_ec_cmd_string(t->command)); | |
3afcf2ec LZ |
252 | wakeup = true; |
253 | } else if ((status & ACPI_EC_FLAG_IBF) == 0) { | |
f92fca00 LZ |
254 | acpi_ec_write_cmd(ec, t->command); |
255 | t->flags |= ACPI_EC_COMMAND_POLL; | |
7c6db4e0 | 256 | } else |
dd15f8c4 | 257 | goto err; |
c0d65341 | 258 | return wakeup; |
f92fca00 | 259 | } |
dd15f8c4 | 260 | err: |
a3cd8d27 FT |
261 | /* |
262 | * If SCI bit is set, then don't think it's a false IRQ | |
263 | * otherwise will take a not handled IRQ as a false one. | |
264 | */ | |
f92fca00 LZ |
265 | if (!(status & ACPI_EC_FLAG_SCI)) { |
266 | if (in_interrupt() && t) | |
267 | ++t->irq_count; | |
268 | } | |
c0d65341 | 269 | return wakeup; |
f92fca00 | 270 | } |
a3cd8d27 | 271 | |
f92fca00 LZ |
272 | static void start_transaction(struct acpi_ec *ec) |
273 | { | |
274 | ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0; | |
275 | ec->curr->flags = 0; | |
c0d65341 | 276 | (void)advance_transaction(ec); |
845625cd | 277 | } |
03d1d99c | 278 | |
3eba563e | 279 | static int acpi_ec_sync_query(struct acpi_ec *ec, u8 *data); |
7c6db4e0 | 280 | |
a62e8f19 | 281 | static int ec_check_sci_sync(struct acpi_ec *ec, u8 state) |
7c6db5e5 | 282 | { |
7c6db4e0 AS |
283 | if (state & ACPI_EC_FLAG_SCI) { |
284 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) | |
3eba563e | 285 | return acpi_ec_sync_query(ec, NULL); |
7c6db4e0 AS |
286 | } |
287 | return 0; | |
288 | } | |
289 | ||
290 | static int ec_poll(struct acpi_ec *ec) | |
291 | { | |
2a84cb98 | 292 | unsigned long flags; |
28fe5c82 | 293 | int repeat = 5; /* number of command restarts */ |
7a73e60e | 294 | |
2a84cb98 AS |
295 | while (repeat--) { |
296 | unsigned long delay = jiffies + | |
7a18e96d | 297 | msecs_to_jiffies(ec_delay); |
2a84cb98 AS |
298 | do { |
299 | /* don't sleep with disabled interrupts */ | |
300 | if (EC_FLAGS_MSI || irqs_disabled()) { | |
301 | udelay(ACPI_EC_MSI_UDELAY); | |
f92fca00 | 302 | if (ec_transaction_completed(ec)) |
2a84cb98 AS |
303 | return 0; |
304 | } else { | |
305 | if (wait_event_timeout(ec->wait, | |
f92fca00 | 306 | ec_transaction_completed(ec), |
2a84cb98 AS |
307 | msecs_to_jiffies(1))) |
308 | return 0; | |
309 | } | |
f92fca00 | 310 | spin_lock_irqsave(&ec->lock, flags); |
c0d65341 | 311 | (void)advance_transaction(ec); |
f92fca00 | 312 | spin_unlock_irqrestore(&ec->lock, flags); |
2a84cb98 | 313 | } while (time_before(jiffies, delay)); |
16a26e85 | 314 | pr_debug("controller reset, restart transaction\n"); |
f351d027 | 315 | spin_lock_irqsave(&ec->lock, flags); |
2a84cb98 | 316 | start_transaction(ec); |
f351d027 | 317 | spin_unlock_irqrestore(&ec->lock, flags); |
af3fd140 | 318 | } |
b77d81b2 | 319 | return -ETIME; |
1da177e4 LT |
320 | } |
321 | ||
8463200a | 322 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
2a84cb98 | 323 | struct transaction *t) |
45bea155 | 324 | { |
7c6db4e0 | 325 | unsigned long tmp; |
7c6db4e0 | 326 | int ret = 0; |
7a73e60e | 327 | |
5423a0cb | 328 | if (EC_FLAGS_MSI) |
2a84cb98 | 329 | udelay(ACPI_EC_MSI_UDELAY); |
7c6db4e0 | 330 | /* start transaction */ |
f351d027 | 331 | spin_lock_irqsave(&ec->lock, tmp); |
7c6db4e0 | 332 | /* following two actions should be kept atomic */ |
8463200a | 333 | ec->curr = t; |
e34c0e2b LZ |
334 | pr_debug("***** Command(%s) started *****\n", |
335 | acpi_ec_cmd_string(t->command)); | |
a2f93aea | 336 | start_transaction(ec); |
f351d027 | 337 | spin_unlock_irqrestore(&ec->lock, tmp); |
2a84cb98 | 338 | ret = ec_poll(ec); |
f351d027 | 339 | spin_lock_irqsave(&ec->lock, tmp); |
d3090b6a | 340 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) { |
558e4736 | 341 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
d3090b6a LZ |
342 | pr_debug("***** Event stopped *****\n"); |
343 | } | |
e34c0e2b LZ |
344 | pr_debug("***** Command(%s) stopped *****\n", |
345 | acpi_ec_cmd_string(t->command)); | |
8463200a | 346 | ec->curr = NULL; |
f351d027 | 347 | spin_unlock_irqrestore(&ec->lock, tmp); |
7c6db4e0 AS |
348 | return ret; |
349 | } | |
350 | ||
2a84cb98 | 351 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) |
1da177e4 | 352 | { |
d7a76e4c | 353 | int status; |
50526df6 | 354 | u32 glk; |
7a73e60e | 355 | |
8463200a | 356 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
d550d98d | 357 | return -EINVAL; |
8463200a AS |
358 | if (t->rdata) |
359 | memset(t->rdata, 0, t->rlen); | |
f351d027 | 360 | mutex_lock(&ec->mutex); |
fe955682 | 361 | if (test_bit(EC_FLAGS_BLOCKED, &ec->flags)) { |
f6bb13aa RW |
362 | status = -EINVAL; |
363 | goto unlock; | |
364 | } | |
703959d4 | 365 | if (ec->global_lock) { |
1da177e4 | 366 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 367 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
368 | status = -ENODEV; |
369 | goto unlock; | |
c24e912b | 370 | } |
1da177e4 | 371 | } |
a62e8f19 AS |
372 | /* disable GPE during transaction if storm is detected */ |
373 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
3784730b RW |
374 | /* It has to be disabled, so that it doesn't trigger. */ |
375 | acpi_disable_gpe(NULL, ec->gpe); | |
a62e8f19 AS |
376 | } |
377 | ||
2a84cb98 | 378 | status = acpi_ec_transaction_unlocked(ec, t); |
a62e8f19 AS |
379 | |
380 | /* check if we received SCI during transaction */ | |
381 | ec_check_sci_sync(ec, acpi_ec_read_status(ec)); | |
382 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
54070101 | 383 | msleep(1); |
3784730b RW |
384 | /* It is safe to enable the GPE outside of the transaction. */ |
385 | acpi_enable_gpe(NULL, ec->gpe); | |
a520d52e | 386 | } else if (t->irq_count > ec_storm_threshold) { |
16a26e85 | 387 | pr_info("GPE storm detected(%d GPEs), " |
b76b51ba FT |
388 | "transactions will use polling mode\n", |
389 | t->irq_count); | |
a62e8f19 AS |
390 | set_bit(EC_FLAGS_GPE_STORM, &ec->flags); |
391 | } | |
703959d4 | 392 | if (ec->global_lock) |
1da177e4 | 393 | acpi_release_global_lock(glk); |
7c6db4e0 | 394 | unlock: |
f351d027 | 395 | mutex_unlock(&ec->mutex); |
d550d98d | 396 | return status; |
1da177e4 LT |
397 | } |
398 | ||
8a383ef0 | 399 | static int acpi_ec_burst_enable(struct acpi_ec *ec) |
c45aac43 AS |
400 | { |
401 | u8 d; | |
8463200a AS |
402 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
403 | .wdata = NULL, .rdata = &d, | |
404 | .wlen = 0, .rlen = 1}; | |
405 | ||
2a84cb98 | 406 | return acpi_ec_transaction(ec, &t); |
c45aac43 AS |
407 | } |
408 | ||
8a383ef0 | 409 | static int acpi_ec_burst_disable(struct acpi_ec *ec) |
c45aac43 | 410 | { |
8463200a AS |
411 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
412 | .wdata = NULL, .rdata = NULL, | |
413 | .wlen = 0, .rlen = 0}; | |
414 | ||
7c6db4e0 | 415 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
2a84cb98 | 416 | acpi_ec_transaction(ec, &t) : 0; |
c45aac43 AS |
417 | } |
418 | ||
7a73e60e | 419 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 *data) |
3576cf61 DS |
420 | { |
421 | int result; | |
422 | u8 d; | |
8463200a AS |
423 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
424 | .wdata = &address, .rdata = &d, | |
425 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 426 | |
2a84cb98 | 427 | result = acpi_ec_transaction(ec, &t); |
3576cf61 DS |
428 | *data = d; |
429 | return result; | |
430 | } | |
6ffb221a | 431 | |
3576cf61 DS |
432 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
433 | { | |
6ccedb10 | 434 | u8 wdata[2] = { address, data }; |
8463200a AS |
435 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
436 | .wdata = wdata, .rdata = NULL, | |
437 | .wlen = 2, .rlen = 0}; | |
438 | ||
2a84cb98 | 439 | return acpi_ec_transaction(ec, &t); |
3576cf61 DS |
440 | } |
441 | ||
b76b51ba | 442 | int ec_read(u8 addr, u8 *val) |
1da177e4 | 443 | { |
1da177e4 | 444 | int err; |
6ffb221a | 445 | u8 temp_data; |
1da177e4 LT |
446 | |
447 | if (!first_ec) | |
448 | return -ENODEV; | |
449 | ||
d033879c | 450 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
451 | |
452 | if (!err) { | |
453 | *val = temp_data; | |
454 | return 0; | |
7a73e60e LZ |
455 | } |
456 | return err; | |
1da177e4 LT |
457 | } |
458 | EXPORT_SYMBOL(ec_read); | |
459 | ||
50526df6 | 460 | int ec_write(u8 addr, u8 val) |
1da177e4 | 461 | { |
1da177e4 LT |
462 | int err; |
463 | ||
464 | if (!first_ec) | |
465 | return -ENODEV; | |
466 | ||
d033879c | 467 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
468 | |
469 | return err; | |
470 | } | |
471 | EXPORT_SYMBOL(ec_write); | |
472 | ||
616362de | 473 | int ec_transaction(u8 command, |
7a73e60e LZ |
474 | const u8 *wdata, unsigned wdata_len, |
475 | u8 *rdata, unsigned rdata_len) | |
45bea155 | 476 | { |
8463200a AS |
477 | struct transaction t = {.command = command, |
478 | .wdata = wdata, .rdata = rdata, | |
479 | .wlen = wdata_len, .rlen = rdata_len}; | |
7a73e60e | 480 | |
d7a76e4c LP |
481 | if (!first_ec) |
482 | return -ENODEV; | |
45bea155 | 483 | |
2a84cb98 | 484 | return acpi_ec_transaction(first_ec, &t); |
45bea155 | 485 | } |
ab9e43c6 LP |
486 | EXPORT_SYMBOL(ec_transaction); |
487 | ||
3e2abc5a SF |
488 | /* Get the handle to the EC device */ |
489 | acpi_handle ec_get_handle(void) | |
490 | { | |
491 | if (!first_ec) | |
492 | return NULL; | |
493 | return first_ec->handle; | |
494 | } | |
3e2abc5a SF |
495 | EXPORT_SYMBOL(ec_get_handle); |
496 | ||
ad332c8a | 497 | /* |
3eba563e | 498 | * Process _Q events that might have accumulated in the EC. |
ad332c8a KC |
499 | * Run with locked ec mutex. |
500 | */ | |
501 | static void acpi_ec_clear(struct acpi_ec *ec) | |
502 | { | |
503 | int i, status; | |
504 | u8 value = 0; | |
505 | ||
506 | for (i = 0; i < ACPI_EC_CLEAR_MAX; i++) { | |
3eba563e | 507 | status = acpi_ec_sync_query(ec, &value); |
ad332c8a KC |
508 | if (status || !value) |
509 | break; | |
510 | } | |
511 | ||
512 | if (unlikely(i == ACPI_EC_CLEAR_MAX)) | |
513 | pr_warn("Warning: Maximum of %d stale EC events cleared\n", i); | |
514 | else | |
515 | pr_info("%d stale EC events cleared\n", i); | |
516 | } | |
517 | ||
fe955682 | 518 | void acpi_ec_block_transactions(void) |
f6bb13aa RW |
519 | { |
520 | struct acpi_ec *ec = first_ec; | |
521 | ||
522 | if (!ec) | |
523 | return; | |
524 | ||
f351d027 | 525 | mutex_lock(&ec->mutex); |
f6bb13aa | 526 | /* Prevent transactions from being carried out */ |
fe955682 | 527 | set_bit(EC_FLAGS_BLOCKED, &ec->flags); |
f351d027 | 528 | mutex_unlock(&ec->mutex); |
f6bb13aa RW |
529 | } |
530 | ||
fe955682 | 531 | void acpi_ec_unblock_transactions(void) |
f6bb13aa RW |
532 | { |
533 | struct acpi_ec *ec = first_ec; | |
534 | ||
535 | if (!ec) | |
536 | return; | |
537 | ||
f351d027 | 538 | mutex_lock(&ec->mutex); |
f6bb13aa | 539 | /* Allow transactions to be carried out again */ |
fe955682 | 540 | clear_bit(EC_FLAGS_BLOCKED, &ec->flags); |
ad332c8a KC |
541 | |
542 | if (EC_FLAGS_CLEAR_ON_RESUME) | |
543 | acpi_ec_clear(ec); | |
544 | ||
f351d027 | 545 | mutex_unlock(&ec->mutex); |
f6bb13aa RW |
546 | } |
547 | ||
fe955682 | 548 | void acpi_ec_unblock_transactions_early(void) |
d5a64513 RW |
549 | { |
550 | /* | |
551 | * Allow transactions to happen again (this function is called from | |
552 | * atomic context during wakeup, so we don't need to acquire the mutex). | |
553 | */ | |
554 | if (first_ec) | |
fe955682 | 555 | clear_bit(EC_FLAGS_BLOCKED, &first_ec->flags); |
d5a64513 RW |
556 | } |
557 | ||
7a73e60e | 558 | static int acpi_ec_query_unlocked(struct acpi_ec *ec, u8 *data) |
3576cf61 DS |
559 | { |
560 | int result; | |
6ccedb10 | 561 | u8 d; |
8463200a AS |
562 | struct transaction t = {.command = ACPI_EC_COMMAND_QUERY, |
563 | .wdata = NULL, .rdata = &d, | |
564 | .wlen = 0, .rlen = 1}; | |
7a73e60e | 565 | |
6ccedb10 AS |
566 | if (!ec || !data) |
567 | return -EINVAL; | |
6ccedb10 AS |
568 | /* |
569 | * Query the EC to find out which _Qxx method we need to evaluate. | |
570 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
571 | * bit to be cleared (and thus clearing the interrupt source). | |
572 | */ | |
a62e8f19 | 573 | result = acpi_ec_transaction_unlocked(ec, &t); |
6ccedb10 AS |
574 | if (result) |
575 | return result; | |
6ccedb10 AS |
576 | if (!d) |
577 | return -ENODATA; | |
6ccedb10 AS |
578 | *data = d; |
579 | return 0; | |
1da177e4 LT |
580 | } |
581 | ||
1da177e4 LT |
582 | /* -------------------------------------------------------------------------- |
583 | Event Management | |
584 | -------------------------------------------------------------------------- */ | |
837012ed AS |
585 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
586 | acpi_handle handle, acpi_ec_query_func func, | |
587 | void *data) | |
588 | { | |
589 | struct acpi_ec_query_handler *handler = | |
590 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
7a73e60e | 591 | |
837012ed AS |
592 | if (!handler) |
593 | return -ENOMEM; | |
594 | ||
595 | handler->query_bit = query_bit; | |
596 | handler->handle = handle; | |
597 | handler->func = func; | |
598 | handler->data = data; | |
f351d027 | 599 | mutex_lock(&ec->mutex); |
30c08574 | 600 | list_add(&handler->node, &ec->list); |
f351d027 | 601 | mutex_unlock(&ec->mutex); |
837012ed AS |
602 | return 0; |
603 | } | |
837012ed AS |
604 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); |
605 | ||
606 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
607 | { | |
1544fdbc | 608 | struct acpi_ec_query_handler *handler, *tmp; |
7a73e60e | 609 | |
f351d027 | 610 | mutex_lock(&ec->mutex); |
1544fdbc | 611 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
612 | if (query_bit == handler->query_bit) { |
613 | list_del(&handler->node); | |
614 | kfree(handler); | |
837012ed AS |
615 | } |
616 | } | |
f351d027 | 617 | mutex_unlock(&ec->mutex); |
837012ed | 618 | } |
837012ed | 619 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); |
1da177e4 | 620 | |
a62e8f19 | 621 | static void acpi_ec_run(void *cxt) |
45bea155 | 622 | { |
a62e8f19 | 623 | struct acpi_ec_query_handler *handler = cxt; |
7a73e60e | 624 | |
a62e8f19 | 625 | if (!handler) |
e41334c0 | 626 | return; |
d3090b6a | 627 | pr_debug("##### Query(0x%02x) started #####\n", handler->query_bit); |
a62e8f19 AS |
628 | if (handler->func) |
629 | handler->func(handler->data); | |
630 | else if (handler->handle) | |
631 | acpi_evaluate_object(handler->handle, NULL, NULL, NULL); | |
d3090b6a | 632 | pr_debug("##### Query(0x%02x) stopped #####\n", handler->query_bit); |
a62e8f19 AS |
633 | kfree(handler); |
634 | } | |
635 | ||
3eba563e | 636 | static int acpi_ec_sync_query(struct acpi_ec *ec, u8 *data) |
a62e8f19 AS |
637 | { |
638 | u8 value = 0; | |
639 | int status; | |
640 | struct acpi_ec_query_handler *handler, *copy; | |
3eba563e KC |
641 | |
642 | status = acpi_ec_query_unlocked(ec, &value); | |
643 | if (data) | |
644 | *data = value; | |
645 | if (status) | |
a62e8f19 | 646 | return status; |
3eba563e | 647 | |
837012ed AS |
648 | list_for_each_entry(handler, &ec->list, node) { |
649 | if (value == handler->query_bit) { | |
650 | /* have custom handler for this bit */ | |
a62e8f19 AS |
651 | copy = kmalloc(sizeof(*handler), GFP_KERNEL); |
652 | if (!copy) | |
653 | return -ENOMEM; | |
654 | memcpy(copy, handler, sizeof(*copy)); | |
d3090b6a LZ |
655 | pr_debug("##### Query(0x%02x) scheduled #####\n", |
656 | handler->query_bit); | |
f5347867 AS |
657 | return acpi_os_execute((copy->func) ? |
658 | OSL_NOTIFY_HANDLER : OSL_GPE_HANDLER, | |
a62e8f19 | 659 | acpi_ec_run, copy); |
837012ed AS |
660 | } |
661 | } | |
a62e8f19 AS |
662 | return 0; |
663 | } | |
664 | ||
665 | static void acpi_ec_gpe_query(void *ec_cxt) | |
666 | { | |
667 | struct acpi_ec *ec = ec_cxt; | |
7a73e60e | 668 | |
a62e8f19 AS |
669 | if (!ec) |
670 | return; | |
f351d027 | 671 | mutex_lock(&ec->mutex); |
3eba563e | 672 | acpi_ec_sync_query(ec, NULL); |
f351d027 | 673 | mutex_unlock(&ec->mutex); |
45bea155 | 674 | } |
1da177e4 | 675 | |
a62e8f19 AS |
676 | static int ec_check_sci(struct acpi_ec *ec, u8 state) |
677 | { | |
678 | if (state & ACPI_EC_FLAG_SCI) { | |
679 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) { | |
d3090b6a | 680 | pr_debug("***** Event started *****\n"); |
a62e8f19 AS |
681 | return acpi_os_execute(OSL_NOTIFY_HANDLER, |
682 | acpi_ec_gpe_query, ec); | |
683 | } | |
684 | } | |
685 | return 0; | |
686 | } | |
687 | ||
8b6cd8ad LM |
688 | static u32 acpi_ec_gpe_handler(acpi_handle gpe_device, |
689 | u32 gpe_number, void *data) | |
1da177e4 | 690 | { |
f92fca00 | 691 | unsigned long flags; |
3d02b90b | 692 | struct acpi_ec *ec = data; |
7c6db4e0 | 693 | |
f92fca00 | 694 | spin_lock_irqsave(&ec->lock, flags); |
c0d65341 | 695 | if (advance_transaction(ec)) |
2a84cb98 | 696 | wake_up(&ec->wait); |
c0d65341 LZ |
697 | spin_unlock_irqrestore(&ec->lock, flags); |
698 | ec_check_sci(ec, acpi_ec_read_status(ec)); | |
bba63a29 | 699 | return ACPI_INTERRUPT_HANDLED | ACPI_REENABLE_GPE; |
845625cd AS |
700 | } |
701 | ||
1da177e4 | 702 | /* -------------------------------------------------------------------------- |
7a73e60e LZ |
703 | * Address Space Management |
704 | * -------------------------------------------------------------------------- */ | |
1da177e4 | 705 | |
1da177e4 | 706 | static acpi_status |
5b7734b4 | 707 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
dadf28a1 | 708 | u32 bits, u64 *value64, |
50526df6 | 709 | void *handler_context, void *region_context) |
1da177e4 | 710 | { |
3d02b90b | 711 | struct acpi_ec *ec = handler_context; |
dadf28a1 AS |
712 | int result = 0, i, bytes = bits / 8; |
713 | u8 *value = (u8 *)value64; | |
1da177e4 | 714 | |
1da177e4 | 715 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 716 | return AE_BAD_PARAMETER; |
1da177e4 | 717 | |
5b7734b4 | 718 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 719 | return AE_BAD_PARAMETER; |
1da177e4 | 720 | |
dadf28a1 | 721 | if (EC_FLAGS_MSI || bits > 8) |
6a63b06f | 722 | acpi_ec_burst_enable(ec); |
b3b233c7 | 723 | |
dadf28a1 AS |
724 | for (i = 0; i < bytes; ++i, ++address, ++value) |
725 | result = (function == ACPI_READ) ? | |
726 | acpi_ec_read(ec, address, value) : | |
727 | acpi_ec_write(ec, address, *value); | |
1da177e4 | 728 | |
dadf28a1 | 729 | if (EC_FLAGS_MSI || bits > 8) |
6a63b06f | 730 | acpi_ec_burst_disable(ec); |
b3b233c7 | 731 | |
1da177e4 LT |
732 | switch (result) { |
733 | case -EINVAL: | |
d550d98d | 734 | return AE_BAD_PARAMETER; |
1da177e4 | 735 | case -ENODEV: |
d550d98d | 736 | return AE_NOT_FOUND; |
1da177e4 | 737 | case -ETIME: |
d550d98d | 738 | return AE_TIME; |
1da177e4 | 739 | default: |
d550d98d | 740 | return AE_OK; |
1da177e4 | 741 | } |
1da177e4 LT |
742 | } |
743 | ||
1da177e4 | 744 | /* -------------------------------------------------------------------------- |
7a73e60e LZ |
745 | * Driver Interface |
746 | * -------------------------------------------------------------------------- */ | |
747 | ||
c0900c35 AS |
748 | static acpi_status |
749 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
750 | ||
c0900c35 AS |
751 | static struct acpi_ec *make_acpi_ec(void) |
752 | { | |
753 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
7a73e60e | 754 | |
c0900c35 AS |
755 | if (!ec) |
756 | return NULL; | |
080e412c | 757 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
f351d027 | 758 | mutex_init(&ec->mutex); |
c0900c35 | 759 | init_waitqueue_head(&ec->wait); |
837012ed | 760 | INIT_LIST_HEAD(&ec->list); |
f351d027 | 761 | spin_lock_init(&ec->lock); |
c0900c35 AS |
762 | return ec; |
763 | } | |
837012ed | 764 | |
c019b193 AS |
765 | static acpi_status |
766 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
767 | void *context, void **return_value) | |
768 | { | |
0175d562 LM |
769 | char node_name[5]; |
770 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
c019b193 AS |
771 | struct acpi_ec *ec = context; |
772 | int value = 0; | |
0175d562 LM |
773 | acpi_status status; |
774 | ||
775 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); | |
776 | ||
7a73e60e | 777 | if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) |
c019b193 | 778 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
c019b193 AS |
779 | return AE_OK; |
780 | } | |
781 | ||
cd8c93a4 AS |
782 | static acpi_status |
783 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 784 | { |
cd8c93a4 | 785 | acpi_status status; |
d21cf3c1 | 786 | unsigned long long tmp = 0; |
cd8c93a4 | 787 | struct acpi_ec *ec = context; |
a5032bfd AS |
788 | |
789 | /* clear addr values, ec_parse_io_ports depend on it */ | |
790 | ec->command_addr = ec->data_addr = 0; | |
791 | ||
cd8c93a4 AS |
792 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
793 | ec_parse_io_ports, ec); | |
794 | if (ACPI_FAILURE(status)) | |
795 | return status; | |
837012ed AS |
796 | |
797 | /* Get GPE bit assignment (EC events). */ | |
798 | /* TODO: Add support for _GPE returning a package */ | |
27663c58 | 799 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
cd8c93a4 AS |
800 | if (ACPI_FAILURE(status)) |
801 | return status; | |
27663c58 | 802 | ec->gpe = tmp; |
837012ed | 803 | /* Use the global lock for all EC transactions? */ |
d21cf3c1 | 804 | tmp = 0; |
27663c58 MW |
805 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
806 | ec->global_lock = tmp; | |
837012ed | 807 | ec->handle = handle; |
cd8c93a4 | 808 | return AE_CTRL_TERMINATE; |
837012ed AS |
809 | } |
810 | ||
5efc5476 BH |
811 | static int ec_install_handlers(struct acpi_ec *ec) |
812 | { | |
813 | acpi_status status; | |
7a73e60e | 814 | |
5efc5476 BH |
815 | if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) |
816 | return 0; | |
817 | status = acpi_install_gpe_handler(NULL, ec->gpe, | |
818 | ACPI_GPE_EDGE_TRIGGERED, | |
819 | &acpi_ec_gpe_handler, ec); | |
820 | if (ACPI_FAILURE(status)) | |
821 | return -ENODEV; | |
9630bdd9 | 822 | |
a44061aa | 823 | acpi_enable_gpe(NULL, ec->gpe); |
5efc5476 BH |
824 | status = acpi_install_address_space_handler(ec->handle, |
825 | ACPI_ADR_SPACE_EC, | |
826 | &acpi_ec_space_handler, | |
827 | NULL, ec); | |
828 | if (ACPI_FAILURE(status)) { | |
829 | if (status == AE_NOT_FOUND) { | |
830 | /* | |
831 | * Maybe OS fails in evaluating the _REG object. | |
832 | * The AE_NOT_FOUND error will be ignored and OS | |
833 | * continue to initialize EC. | |
834 | */ | |
16a26e85 | 835 | pr_err("Fail in evaluating the _REG object" |
5efc5476 BH |
836 | " of EC device. Broken bios is suspected.\n"); |
837 | } else { | |
42b946bb | 838 | acpi_disable_gpe(NULL, ec->gpe); |
5efc5476 BH |
839 | acpi_remove_gpe_handler(NULL, ec->gpe, |
840 | &acpi_ec_gpe_handler); | |
841 | return -ENODEV; | |
842 | } | |
843 | } | |
844 | ||
845 | set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); | |
846 | return 0; | |
847 | } | |
848 | ||
4c611060 AS |
849 | static void ec_remove_handlers(struct acpi_ec *ec) |
850 | { | |
a44061aa | 851 | acpi_disable_gpe(NULL, ec->gpe); |
4c611060 AS |
852 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, |
853 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
16a26e85 | 854 | pr_err("failed to remove space handler\n"); |
4c611060 AS |
855 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
856 | &acpi_ec_gpe_handler))) | |
16a26e85 | 857 | pr_err("failed to remove gpe handler\n"); |
7c6db4e0 | 858 | clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
4c611060 AS |
859 | } |
860 | ||
703959d4 | 861 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 862 | { |
703959d4 | 863 | struct acpi_ec *ec = NULL; |
d02be047 | 864 | int ret; |
45bea155 | 865 | |
c0900c35 AS |
866 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
867 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
868 | ||
4c611060 | 869 | /* Check for boot EC */ |
ce52ddf5 AS |
870 | if (boot_ec && |
871 | (boot_ec->handle == device->handle || | |
872 | boot_ec->handle == ACPI_ROOT_OBJECT)) { | |
873 | ec = boot_ec; | |
874 | boot_ec = NULL; | |
875 | } else { | |
876 | ec = make_acpi_ec(); | |
877 | if (!ec) | |
878 | return -ENOMEM; | |
a5032bfd AS |
879 | } |
880 | if (ec_parse_device(device->handle, 0, ec, NULL) != | |
881 | AE_CTRL_TERMINATE) { | |
ce52ddf5 AS |
882 | kfree(ec); |
883 | return -EINVAL; | |
4c611060 AS |
884 | } |
885 | ||
ce52ddf5 AS |
886 | /* Find and register all query methods */ |
887 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
2263576c | 888 | acpi_ec_register_query_methods, NULL, ec, NULL); |
ce52ddf5 | 889 | |
4c611060 AS |
890 | if (!first_ec) |
891 | first_ec = ec; | |
db89b4f0 | 892 | device->driver_data = ec; |
de4f1046 | 893 | |
d6795fe3 AK |
894 | ret = !!request_region(ec->data_addr, 1, "EC data"); |
895 | WARN(!ret, "Could not request EC data io port 0x%lx", ec->data_addr); | |
896 | ret = !!request_region(ec->command_addr, 1, "EC cmd"); | |
897 | WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr); | |
de4f1046 | 898 | |
16a26e85 | 899 | pr_info("GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 900 | ec->gpe, ec->command_addr, ec->data_addr); |
5efc5476 BH |
901 | |
902 | ret = ec_install_handlers(ec); | |
903 | ||
904 | /* EC is fully operational, allow queries */ | |
905 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); | |
ad332c8a KC |
906 | |
907 | /* Clear stale _Q events if hardware might require that */ | |
908 | if (EC_FLAGS_CLEAR_ON_RESUME) { | |
909 | mutex_lock(&ec->mutex); | |
910 | acpi_ec_clear(ec); | |
911 | mutex_unlock(&ec->mutex); | |
912 | } | |
5efc5476 | 913 | return ret; |
1da177e4 LT |
914 | } |
915 | ||
51fac838 | 916 | static int acpi_ec_remove(struct acpi_device *device) |
1da177e4 | 917 | { |
01f22462 | 918 | struct acpi_ec *ec; |
07ddf768 | 919 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 920 | |
1da177e4 | 921 | if (!device) |
d550d98d | 922 | return -EINVAL; |
1da177e4 LT |
923 | |
924 | ec = acpi_driver_data(device); | |
cf745ec7 | 925 | ec_remove_handlers(ec); |
f351d027 | 926 | mutex_lock(&ec->mutex); |
07ddf768 | 927 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
928 | list_del(&handler->node); |
929 | kfree(handler); | |
930 | } | |
f351d027 | 931 | mutex_unlock(&ec->mutex); |
de4f1046 TR |
932 | release_region(ec->data_addr, 1); |
933 | release_region(ec->command_addr, 1); | |
db89b4f0 | 934 | device->driver_data = NULL; |
d033879c | 935 | if (ec == first_ec) |
c0900c35 | 936 | first_ec = NULL; |
4c611060 | 937 | kfree(ec); |
d550d98d | 938 | return 0; |
1da177e4 LT |
939 | } |
940 | ||
1da177e4 | 941 | static acpi_status |
c0900c35 | 942 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 943 | { |
3d02b90b | 944 | struct acpi_ec *ec = context; |
1da177e4 | 945 | |
01f22462 | 946 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 947 | return AE_OK; |
1da177e4 LT |
948 | |
949 | /* | |
950 | * The first address region returned is the data port, and | |
951 | * the second address region returned is the status/command | |
952 | * port. | |
953 | */ | |
de4f1046 | 954 | if (ec->data_addr == 0) |
6ffb221a | 955 | ec->data_addr = resource->data.io.minimum; |
de4f1046 | 956 | else if (ec->command_addr == 0) |
6ffb221a | 957 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 958 | else |
1da177e4 | 959 | return AE_CTRL_TERMINATE; |
1da177e4 | 960 | |
1da177e4 LT |
961 | return AE_OK; |
962 | } | |
963 | ||
c04209a7 AS |
964 | int __init acpi_boot_ec_enable(void) |
965 | { | |
7c6db4e0 | 966 | if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags)) |
c04209a7 AS |
967 | return 0; |
968 | if (!ec_install_handlers(boot_ec)) { | |
969 | first_ec = boot_ec; | |
970 | return 0; | |
971 | } | |
972 | return -EFAULT; | |
973 | } | |
974 | ||
223883b7 AS |
975 | static const struct acpi_device_id ec_device_ids[] = { |
976 | {"PNP0C09", 0}, | |
977 | {"", 0}, | |
978 | }; | |
979 | ||
478fa03b AS |
980 | /* Some BIOS do not survive early DSDT scan, skip it */ |
981 | static int ec_skip_dsdt_scan(const struct dmi_system_id *id) | |
982 | { | |
983 | EC_FLAGS_SKIP_DSDT_SCAN = 1; | |
984 | return 0; | |
985 | } | |
986 | ||
0adf3c74 AS |
987 | /* ASUStek often supplies us with broken ECDT, validate it */ |
988 | static int ec_validate_ecdt(const struct dmi_system_id *id) | |
989 | { | |
990 | EC_FLAGS_VALIDATE_ECDT = 1; | |
991 | return 0; | |
992 | } | |
993 | ||
994 | /* MSI EC needs special treatment, enable it */ | |
995 | static int ec_flag_msi(const struct dmi_system_id *id) | |
996 | { | |
16a26e85 | 997 | pr_debug("Detected MSI hardware, enabling workarounds.\n"); |
0adf3c74 AS |
998 | EC_FLAGS_MSI = 1; |
999 | EC_FLAGS_VALIDATE_ECDT = 1; | |
1000 | return 0; | |
1001 | } | |
1002 | ||
67bfa9b6 FT |
1003 | /* |
1004 | * Clevo M720 notebook actually works ok with IRQ mode, if we lifted | |
1005 | * the GPE storm threshold back to 20 | |
1006 | */ | |
1007 | static int ec_enlarge_storm_threshold(const struct dmi_system_id *id) | |
1008 | { | |
1009 | pr_debug("Setting the EC GPE storm threshold to 20\n"); | |
1010 | ec_storm_threshold = 20; | |
1011 | return 0; | |
1012 | } | |
1013 | ||
ad332c8a KC |
1014 | /* |
1015 | * On some hardware it is necessary to clear events accumulated by the EC during | |
1016 | * sleep. These ECs stop reporting GPEs until they are manually polled, if too | |
1017 | * many events are accumulated. (e.g. Samsung Series 5/9 notebooks) | |
1018 | * | |
1019 | * https://bugzilla.kernel.org/show_bug.cgi?id=44161 | |
1020 | * | |
1021 | * Ideally, the EC should also be instructed NOT to accumulate events during | |
1022 | * sleep (which Windows seems to do somehow), but the interface to control this | |
1023 | * behaviour is not known at this time. | |
1024 | * | |
1025 | * Models known to be affected are Samsung 530Uxx/535Uxx/540Uxx/550Pxx/900Xxx, | |
1026 | * however it is very likely that other Samsung models are affected. | |
1027 | * | |
1028 | * On systems which don't accumulate _Q events during sleep, this extra check | |
1029 | * should be harmless. | |
1030 | */ | |
1031 | static int ec_clear_on_resume(const struct dmi_system_id *id) | |
1032 | { | |
1033 | pr_debug("Detected system needing EC poll on resume.\n"); | |
1034 | EC_FLAGS_CLEAR_ON_RESUME = 1; | |
1035 | return 0; | |
1036 | } | |
1037 | ||
6cef7497 | 1038 | static struct dmi_system_id ec_dmi_table[] __initdata = { |
478fa03b AS |
1039 | { |
1040 | ec_skip_dsdt_scan, "Compal JFL92", { | |
1041 | DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"), | |
1042 | DMI_MATCH(DMI_BOARD_NAME, "JFL92") }, NULL}, | |
0adf3c74 AS |
1043 | { |
1044 | ec_flag_msi, "MSI hardware", { | |
55b313f2 AS |
1045 | DMI_MATCH(DMI_BIOS_VENDOR, "Micro-Star")}, NULL}, |
1046 | { | |
1047 | ec_flag_msi, "MSI hardware", { | |
1048 | DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star")}, NULL}, | |
1049 | { | |
1050 | ec_flag_msi, "MSI hardware", { | |
1051 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-Star")}, NULL}, | |
0adf3c74 | 1052 | { |
a5dc4f89 AS |
1053 | ec_flag_msi, "MSI hardware", { |
1054 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-STAR")}, NULL}, | |
1055 | { | |
534bc4e3 ZR |
1056 | ec_flag_msi, "Quanta hardware", { |
1057 | DMI_MATCH(DMI_SYS_VENDOR, "Quanta"), | |
1058 | DMI_MATCH(DMI_PRODUCT_NAME, "TW8/SW8/DW8"),}, NULL}, | |
1059 | { | |
1060 | ec_flag_msi, "Quanta hardware", { | |
1061 | DMI_MATCH(DMI_SYS_VENDOR, "Quanta"), | |
1062 | DMI_MATCH(DMI_PRODUCT_NAME, "TW9/SW9"),}, NULL}, | |
1063 | { | |
777cb382 LT |
1064 | ec_flag_msi, "Clevo W350etq", { |
1065 | DMI_MATCH(DMI_SYS_VENDOR, "CLEVO CO."), | |
1066 | DMI_MATCH(DMI_PRODUCT_NAME, "W35_37ET"),}, NULL}, | |
1067 | { | |
0adf3c74 AS |
1068 | ec_validate_ecdt, "ASUS hardware", { |
1069 | DMI_MATCH(DMI_BIOS_VENDOR, "ASUS") }, NULL}, | |
af986d10 PC |
1070 | { |
1071 | ec_validate_ecdt, "ASUS hardware", { | |
1072 | DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc.") }, NULL}, | |
67bfa9b6 FT |
1073 | { |
1074 | ec_enlarge_storm_threshold, "CLEVO hardware", { | |
1075 | DMI_MATCH(DMI_SYS_VENDOR, "CLEVO Co."), | |
1076 | DMI_MATCH(DMI_PRODUCT_NAME, "M720T/M730T"),}, NULL}, | |
eff9a4b6 LT |
1077 | { |
1078 | ec_skip_dsdt_scan, "HP Folio 13", { | |
1079 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), | |
1080 | DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13"),}, NULL}, | |
524f42fa LT |
1081 | { |
1082 | ec_validate_ecdt, "ASUS hardware", { | |
1083 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTek Computer Inc."), | |
1084 | DMI_MATCH(DMI_PRODUCT_NAME, "L4R"),}, NULL}, | |
ad332c8a KC |
1085 | { |
1086 | ec_clear_on_resume, "Samsung hardware", { | |
1087 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD.")}, NULL}, | |
0adf3c74 AS |
1088 | {}, |
1089 | }; | |
1090 | ||
c0900c35 AS |
1091 | int __init acpi_ec_ecdt_probe(void) |
1092 | { | |
c0900c35 | 1093 | acpi_status status; |
c6cb0e87 | 1094 | struct acpi_ec *saved_ec = NULL; |
50526df6 | 1095 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 1096 | |
d66d969d AS |
1097 | boot_ec = make_acpi_ec(); |
1098 | if (!boot_ec) | |
c0900c35 AS |
1099 | return -ENOMEM; |
1100 | /* | |
1101 | * Generate a boot ec context | |
1102 | */ | |
0adf3c74 | 1103 | dmi_check_system(ec_dmi_table); |
15a58ed1 AS |
1104 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
1105 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 1106 | if (ACPI_SUCCESS(status)) { |
16a26e85 | 1107 | pr_info("EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
1108 | boot_ec->command_addr = ecdt_ptr->control.address; |
1109 | boot_ec->data_addr = ecdt_ptr->data.address; | |
1110 | boot_ec->gpe = ecdt_ptr->gpe; | |
4af8e10a | 1111 | boot_ec->handle = ACPI_ROOT_OBJECT; |
7a73e60e LZ |
1112 | acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, |
1113 | &boot_ec->handle); | |
c6cb0e87 | 1114 | /* Don't trust ECDT, which comes from ASUSTek */ |
0adf3c74 | 1115 | if (!EC_FLAGS_VALIDATE_ECDT) |
c5279dee | 1116 | goto install; |
d6bd535d | 1117 | saved_ec = kmemdup(boot_ec, sizeof(struct acpi_ec), GFP_KERNEL); |
c6cb0e87 AS |
1118 | if (!saved_ec) |
1119 | return -ENOMEM; | |
c5279dee | 1120 | /* fall through */ |
cd8c93a4 | 1121 | } |
0adf3c74 | 1122 | |
ed4b197d CIK |
1123 | if (EC_FLAGS_SKIP_DSDT_SCAN) { |
1124 | kfree(saved_ec); | |
478fa03b | 1125 | return -ENODEV; |
ed4b197d | 1126 | } |
478fa03b | 1127 | |
c5279dee AS |
1128 | /* This workaround is needed only on some broken machines, |
1129 | * which require early EC, but fail to provide ECDT */ | |
16a26e85 | 1130 | pr_debug("Look up EC in DSDT\n"); |
c5279dee AS |
1131 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, |
1132 | boot_ec, NULL); | |
1133 | /* Check that acpi_get_devices actually find something */ | |
1134 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
1135 | goto error; | |
c6cb0e87 AS |
1136 | if (saved_ec) { |
1137 | /* try to find good ECDT from ASUSTek */ | |
1138 | if (saved_ec->command_addr != boot_ec->command_addr || | |
1139 | saved_ec->data_addr != boot_ec->data_addr || | |
1140 | saved_ec->gpe != boot_ec->gpe || | |
1141 | saved_ec->handle != boot_ec->handle) | |
16a26e85 | 1142 | pr_info("ASUSTek keeps feeding us with broken " |
c6cb0e87 AS |
1143 | "ECDT tables, which are very hard to workaround. " |
1144 | "Trying to use DSDT EC info instead. Please send " | |
1145 | "output of acpidump to linux-acpi@vger.kernel.org\n"); | |
1146 | kfree(saved_ec); | |
1147 | saved_ec = NULL; | |
1148 | } else { | |
1149 | /* We really need to limit this workaround, the only ASUS, | |
1150 | * which needs it, has fake EC._INI method, so use it as flag. | |
1151 | * Keep boot_ec struct as it will be needed soon. | |
1152 | */ | |
c6cb0e87 | 1153 | if (!dmi_name_in_vendors("ASUS") || |
952c63e9 | 1154 | !acpi_has_method(boot_ec->handle, "_INI")) |
c6cb0e87 AS |
1155 | return -ENODEV; |
1156 | } | |
c5279dee AS |
1157 | install: |
1158 | if (!ec_install_handlers(boot_ec)) { | |
d033879c | 1159 | first_ec = boot_ec; |
e8284321 | 1160 | return 0; |
d033879c | 1161 | } |
c5279dee | 1162 | error: |
d66d969d | 1163 | kfree(boot_ec); |
ed4b197d | 1164 | kfree(saved_ec); |
d66d969d | 1165 | boot_ec = NULL; |
1da177e4 LT |
1166 | return -ENODEV; |
1167 | } | |
1168 | ||
223883b7 AS |
1169 | static struct acpi_driver acpi_ec_driver = { |
1170 | .name = "ec", | |
1171 | .class = ACPI_EC_CLASS, | |
1172 | .ids = ec_device_ids, | |
1173 | .ops = { | |
1174 | .add = acpi_ec_add, | |
1175 | .remove = acpi_ec_remove, | |
223883b7 AS |
1176 | }, |
1177 | }; | |
1178 | ||
a5f820fe | 1179 | int __init acpi_ec_init(void) |
1da177e4 | 1180 | { |
50526df6 | 1181 | int result = 0; |
1da177e4 | 1182 | |
1da177e4 LT |
1183 | /* Now register the driver for the EC */ |
1184 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
49c6c5ff | 1185 | if (result < 0) |
d550d98d | 1186 | return -ENODEV; |
1da177e4 | 1187 | |
d550d98d | 1188 | return result; |
1da177e4 LT |
1189 | } |
1190 | ||
1da177e4 LT |
1191 | /* EC driver currently not unloadable */ |
1192 | #if 0 | |
50526df6 | 1193 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1194 | { |
1da177e4 LT |
1195 | |
1196 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1da177e4 | 1197 | } |
7843932a | 1198 | #endif /* 0 */ |