Commit | Line | Data |
---|---|---|
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 | |
c95f25b0 LZ |
184 | pr_debug("===== %s (%d) =====\n", |
185 | in_interrupt() ? "IRQ" : "TASK", smp_processor_id()); | |
66b42b78 | 186 | status = acpi_ec_read_status(ec); |
36b15875 | 187 | t = ec->curr; |
b76b51ba | 188 | if (!t) |
f92fca00 LZ |
189 | goto err; |
190 | if (t->flags & ACPI_EC_COMMAND_POLL) { | |
191 | if (t->wlen > t->wi) { | |
192 | if ((status & ACPI_EC_FLAG_IBF) == 0) | |
193 | acpi_ec_write_data(ec, t->wdata[t->wi++]); | |
194 | else | |
195 | goto err; | |
196 | } else if (t->rlen > t->ri) { | |
197 | if ((status & ACPI_EC_FLAG_OBF) == 1) { | |
198 | t->rdata[t->ri++] = acpi_ec_read_data(ec); | |
c0d65341 | 199 | if (t->rlen == t->ri) { |
f92fca00 | 200 | t->flags |= ACPI_EC_COMMAND_COMPLETE; |
3afcf2ec LZ |
201 | if (t->command == ACPI_EC_COMMAND_QUERY) |
202 | pr_debug("hardware QR_EC completion\n"); | |
c0d65341 LZ |
203 | wakeup = true; |
204 | } | |
f92fca00 LZ |
205 | } else |
206 | goto err; | |
207 | } else if (t->wlen == t->wi && | |
c0d65341 | 208 | (status & ACPI_EC_FLAG_IBF) == 0) { |
f92fca00 | 209 | t->flags |= ACPI_EC_COMMAND_COMPLETE; |
c0d65341 LZ |
210 | wakeup = true; |
211 | } | |
212 | return wakeup; | |
f92fca00 | 213 | } else { |
3afcf2ec LZ |
214 | /* |
215 | * There is firmware refusing to respond QR_EC when SCI_EVT | |
216 | * is not set, for which case, we complete the QR_EC | |
217 | * without issuing it to the firmware. | |
218 | * https://bugzilla.kernel.org/show_bug.cgi?id=86211 | |
219 | */ | |
220 | if (!(status & ACPI_EC_FLAG_SCI) && | |
221 | (t->command == ACPI_EC_COMMAND_QUERY)) { | |
222 | t->flags |= ACPI_EC_COMMAND_POLL; | |
223 | t->rdata[t->ri++] = 0x00; | |
224 | t->flags |= ACPI_EC_COMMAND_COMPLETE; | |
225 | pr_debug("software QR_EC completion\n"); | |
226 | wakeup = true; | |
227 | } else if ((status & ACPI_EC_FLAG_IBF) == 0) { | |
f92fca00 LZ |
228 | acpi_ec_write_cmd(ec, t->command); |
229 | t->flags |= ACPI_EC_COMMAND_POLL; | |
7c6db4e0 | 230 | } else |
dd15f8c4 | 231 | goto err; |
c0d65341 | 232 | return wakeup; |
f92fca00 | 233 | } |
dd15f8c4 | 234 | err: |
a3cd8d27 FT |
235 | /* |
236 | * If SCI bit is set, then don't think it's a false IRQ | |
237 | * otherwise will take a not handled IRQ as a false one. | |
238 | */ | |
f92fca00 LZ |
239 | if (!(status & ACPI_EC_FLAG_SCI)) { |
240 | if (in_interrupt() && t) | |
241 | ++t->irq_count; | |
242 | } | |
c0d65341 | 243 | return wakeup; |
f92fca00 | 244 | } |
a3cd8d27 | 245 | |
f92fca00 LZ |
246 | static void start_transaction(struct acpi_ec *ec) |
247 | { | |
248 | ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0; | |
249 | ec->curr->flags = 0; | |
c0d65341 | 250 | (void)advance_transaction(ec); |
845625cd | 251 | } |
03d1d99c | 252 | |
3eba563e | 253 | static int acpi_ec_sync_query(struct acpi_ec *ec, u8 *data); |
7c6db4e0 | 254 | |
a62e8f19 | 255 | static int ec_check_sci_sync(struct acpi_ec *ec, u8 state) |
7c6db5e5 | 256 | { |
7c6db4e0 AS |
257 | if (state & ACPI_EC_FLAG_SCI) { |
258 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) | |
3eba563e | 259 | return acpi_ec_sync_query(ec, NULL); |
7c6db4e0 AS |
260 | } |
261 | return 0; | |
262 | } | |
263 | ||
264 | static int ec_poll(struct acpi_ec *ec) | |
265 | { | |
2a84cb98 | 266 | unsigned long flags; |
28fe5c82 | 267 | int repeat = 5; /* number of command restarts */ |
2a84cb98 AS |
268 | while (repeat--) { |
269 | unsigned long delay = jiffies + | |
7a18e96d | 270 | msecs_to_jiffies(ec_delay); |
2a84cb98 AS |
271 | do { |
272 | /* don't sleep with disabled interrupts */ | |
273 | if (EC_FLAGS_MSI || irqs_disabled()) { | |
274 | udelay(ACPI_EC_MSI_UDELAY); | |
f92fca00 | 275 | if (ec_transaction_completed(ec)) |
2a84cb98 AS |
276 | return 0; |
277 | } else { | |
278 | if (wait_event_timeout(ec->wait, | |
f92fca00 | 279 | ec_transaction_completed(ec), |
2a84cb98 AS |
280 | msecs_to_jiffies(1))) |
281 | return 0; | |
282 | } | |
f92fca00 | 283 | spin_lock_irqsave(&ec->lock, flags); |
c0d65341 | 284 | (void)advance_transaction(ec); |
f92fca00 | 285 | spin_unlock_irqrestore(&ec->lock, flags); |
2a84cb98 | 286 | } while (time_before(jiffies, delay)); |
16a26e85 | 287 | pr_debug("controller reset, restart transaction\n"); |
f351d027 | 288 | spin_lock_irqsave(&ec->lock, flags); |
2a84cb98 | 289 | start_transaction(ec); |
f351d027 | 290 | spin_unlock_irqrestore(&ec->lock, flags); |
af3fd140 | 291 | } |
b77d81b2 | 292 | return -ETIME; |
1da177e4 LT |
293 | } |
294 | ||
8463200a | 295 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
2a84cb98 | 296 | struct transaction *t) |
45bea155 | 297 | { |
7c6db4e0 | 298 | unsigned long tmp; |
7c6db4e0 | 299 | int ret = 0; |
5423a0cb | 300 | if (EC_FLAGS_MSI) |
2a84cb98 | 301 | udelay(ACPI_EC_MSI_UDELAY); |
7c6db4e0 | 302 | /* start transaction */ |
f351d027 | 303 | spin_lock_irqsave(&ec->lock, tmp); |
7c6db4e0 | 304 | /* following two actions should be kept atomic */ |
8463200a | 305 | ec->curr = t; |
459572a7 LZ |
306 | pr_debug("transaction start (cmd=0x%02x, addr=0x%02x)\n", |
307 | t->command, t->wdata ? t->wdata[0] : 0); | |
a2f93aea | 308 | start_transaction(ec); |
f351d027 | 309 | spin_unlock_irqrestore(&ec->lock, tmp); |
2a84cb98 | 310 | ret = ec_poll(ec); |
f351d027 | 311 | spin_lock_irqsave(&ec->lock, tmp); |
558e4736 LZ |
312 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) |
313 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); | |
459572a7 | 314 | pr_debug("transaction end\n"); |
8463200a | 315 | ec->curr = NULL; |
f351d027 | 316 | spin_unlock_irqrestore(&ec->lock, tmp); |
7c6db4e0 AS |
317 | return ret; |
318 | } | |
319 | ||
2a84cb98 | 320 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) |
1da177e4 | 321 | { |
d7a76e4c | 322 | int status; |
50526df6 | 323 | u32 glk; |
8463200a | 324 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
d550d98d | 325 | return -EINVAL; |
8463200a AS |
326 | if (t->rdata) |
327 | memset(t->rdata, 0, t->rlen); | |
f351d027 | 328 | mutex_lock(&ec->mutex); |
fe955682 | 329 | if (test_bit(EC_FLAGS_BLOCKED, &ec->flags)) { |
f6bb13aa RW |
330 | status = -EINVAL; |
331 | goto unlock; | |
332 | } | |
703959d4 | 333 | if (ec->global_lock) { |
1da177e4 | 334 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 335 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
336 | status = -ENODEV; |
337 | goto unlock; | |
c24e912b | 338 | } |
1da177e4 | 339 | } |
a62e8f19 AS |
340 | /* disable GPE during transaction if storm is detected */ |
341 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
3784730b RW |
342 | /* It has to be disabled, so that it doesn't trigger. */ |
343 | acpi_disable_gpe(NULL, ec->gpe); | |
a62e8f19 AS |
344 | } |
345 | ||
2a84cb98 | 346 | status = acpi_ec_transaction_unlocked(ec, t); |
a62e8f19 AS |
347 | |
348 | /* check if we received SCI during transaction */ | |
349 | ec_check_sci_sync(ec, acpi_ec_read_status(ec)); | |
350 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
54070101 | 351 | msleep(1); |
3784730b RW |
352 | /* It is safe to enable the GPE outside of the transaction. */ |
353 | acpi_enable_gpe(NULL, ec->gpe); | |
a520d52e | 354 | } else if (t->irq_count > ec_storm_threshold) { |
16a26e85 | 355 | pr_info("GPE storm detected(%d GPEs), " |
b76b51ba FT |
356 | "transactions will use polling mode\n", |
357 | t->irq_count); | |
a62e8f19 AS |
358 | set_bit(EC_FLAGS_GPE_STORM, &ec->flags); |
359 | } | |
703959d4 | 360 | if (ec->global_lock) |
1da177e4 | 361 | acpi_release_global_lock(glk); |
7c6db4e0 | 362 | unlock: |
f351d027 | 363 | mutex_unlock(&ec->mutex); |
d550d98d | 364 | return status; |
1da177e4 LT |
365 | } |
366 | ||
8a383ef0 | 367 | static int acpi_ec_burst_enable(struct acpi_ec *ec) |
c45aac43 AS |
368 | { |
369 | u8 d; | |
8463200a AS |
370 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
371 | .wdata = NULL, .rdata = &d, | |
372 | .wlen = 0, .rlen = 1}; | |
373 | ||
2a84cb98 | 374 | return acpi_ec_transaction(ec, &t); |
c45aac43 AS |
375 | } |
376 | ||
8a383ef0 | 377 | static int acpi_ec_burst_disable(struct acpi_ec *ec) |
c45aac43 | 378 | { |
8463200a AS |
379 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
380 | .wdata = NULL, .rdata = NULL, | |
381 | .wlen = 0, .rlen = 0}; | |
382 | ||
7c6db4e0 | 383 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
2a84cb98 | 384 | acpi_ec_transaction(ec, &t) : 0; |
c45aac43 AS |
385 | } |
386 | ||
6ccedb10 | 387 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) |
3576cf61 DS |
388 | { |
389 | int result; | |
390 | u8 d; | |
8463200a AS |
391 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
392 | .wdata = &address, .rdata = &d, | |
393 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 394 | |
2a84cb98 | 395 | result = acpi_ec_transaction(ec, &t); |
3576cf61 DS |
396 | *data = d; |
397 | return result; | |
398 | } | |
6ffb221a | 399 | |
3576cf61 DS |
400 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
401 | { | |
6ccedb10 | 402 | u8 wdata[2] = { address, data }; |
8463200a AS |
403 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
404 | .wdata = wdata, .rdata = NULL, | |
405 | .wlen = 2, .rlen = 0}; | |
406 | ||
2a84cb98 | 407 | return acpi_ec_transaction(ec, &t); |
3576cf61 DS |
408 | } |
409 | ||
b76b51ba | 410 | int ec_read(u8 addr, u8 *val) |
1da177e4 | 411 | { |
1da177e4 | 412 | int err; |
6ffb221a | 413 | u8 temp_data; |
1da177e4 LT |
414 | |
415 | if (!first_ec) | |
416 | return -ENODEV; | |
417 | ||
d033879c | 418 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
419 | |
420 | if (!err) { | |
421 | *val = temp_data; | |
422 | return 0; | |
50526df6 | 423 | } else |
1da177e4 LT |
424 | return err; |
425 | } | |
50526df6 | 426 | |
1da177e4 LT |
427 | EXPORT_SYMBOL(ec_read); |
428 | ||
50526df6 | 429 | int ec_write(u8 addr, u8 val) |
1da177e4 | 430 | { |
1da177e4 LT |
431 | int err; |
432 | ||
433 | if (!first_ec) | |
434 | return -ENODEV; | |
435 | ||
d033879c | 436 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
437 | |
438 | return err; | |
439 | } | |
50526df6 | 440 | |
1da177e4 LT |
441 | EXPORT_SYMBOL(ec_write); |
442 | ||
616362de | 443 | int ec_transaction(u8 command, |
9e197219 | 444 | const u8 * wdata, unsigned wdata_len, |
1cb7b1e0 | 445 | u8 * rdata, unsigned rdata_len) |
45bea155 | 446 | { |
8463200a AS |
447 | struct transaction t = {.command = command, |
448 | .wdata = wdata, .rdata = rdata, | |
449 | .wlen = wdata_len, .rlen = rdata_len}; | |
d7a76e4c LP |
450 | if (!first_ec) |
451 | return -ENODEV; | |
45bea155 | 452 | |
2a84cb98 | 453 | return acpi_ec_transaction(first_ec, &t); |
45bea155 | 454 | } |
1da177e4 | 455 | |
ab9e43c6 LP |
456 | EXPORT_SYMBOL(ec_transaction); |
457 | ||
3e2abc5a SF |
458 | /* Get the handle to the EC device */ |
459 | acpi_handle ec_get_handle(void) | |
460 | { | |
461 | if (!first_ec) | |
462 | return NULL; | |
463 | return first_ec->handle; | |
464 | } | |
465 | ||
466 | EXPORT_SYMBOL(ec_get_handle); | |
467 | ||
ad332c8a | 468 | /* |
3eba563e | 469 | * Process _Q events that might have accumulated in the EC. |
ad332c8a KC |
470 | * Run with locked ec mutex. |
471 | */ | |
472 | static void acpi_ec_clear(struct acpi_ec *ec) | |
473 | { | |
474 | int i, status; | |
475 | u8 value = 0; | |
476 | ||
477 | for (i = 0; i < ACPI_EC_CLEAR_MAX; i++) { | |
3eba563e | 478 | status = acpi_ec_sync_query(ec, &value); |
ad332c8a KC |
479 | if (status || !value) |
480 | break; | |
481 | } | |
482 | ||
483 | if (unlikely(i == ACPI_EC_CLEAR_MAX)) | |
484 | pr_warn("Warning: Maximum of %d stale EC events cleared\n", i); | |
485 | else | |
486 | pr_info("%d stale EC events cleared\n", i); | |
487 | } | |
488 | ||
fe955682 | 489 | void acpi_ec_block_transactions(void) |
f6bb13aa RW |
490 | { |
491 | struct acpi_ec *ec = first_ec; | |
492 | ||
493 | if (!ec) | |
494 | return; | |
495 | ||
f351d027 | 496 | mutex_lock(&ec->mutex); |
f6bb13aa | 497 | /* Prevent transactions from being carried out */ |
fe955682 | 498 | set_bit(EC_FLAGS_BLOCKED, &ec->flags); |
f351d027 | 499 | mutex_unlock(&ec->mutex); |
f6bb13aa RW |
500 | } |
501 | ||
fe955682 | 502 | void acpi_ec_unblock_transactions(void) |
f6bb13aa RW |
503 | { |
504 | struct acpi_ec *ec = first_ec; | |
505 | ||
506 | if (!ec) | |
507 | return; | |
508 | ||
f351d027 | 509 | mutex_lock(&ec->mutex); |
f6bb13aa | 510 | /* Allow transactions to be carried out again */ |
fe955682 | 511 | clear_bit(EC_FLAGS_BLOCKED, &ec->flags); |
ad332c8a KC |
512 | |
513 | if (EC_FLAGS_CLEAR_ON_RESUME) | |
514 | acpi_ec_clear(ec); | |
515 | ||
f351d027 | 516 | mutex_unlock(&ec->mutex); |
f6bb13aa RW |
517 | } |
518 | ||
fe955682 | 519 | void acpi_ec_unblock_transactions_early(void) |
d5a64513 RW |
520 | { |
521 | /* | |
522 | * Allow transactions to happen again (this function is called from | |
523 | * atomic context during wakeup, so we don't need to acquire the mutex). | |
524 | */ | |
525 | if (first_ec) | |
fe955682 | 526 | clear_bit(EC_FLAGS_BLOCKED, &first_ec->flags); |
d5a64513 RW |
527 | } |
528 | ||
a62e8f19 | 529 | static int acpi_ec_query_unlocked(struct acpi_ec *ec, u8 * data) |
3576cf61 DS |
530 | { |
531 | int result; | |
6ccedb10 | 532 | u8 d; |
8463200a AS |
533 | struct transaction t = {.command = ACPI_EC_COMMAND_QUERY, |
534 | .wdata = NULL, .rdata = &d, | |
535 | .wlen = 0, .rlen = 1}; | |
6ccedb10 AS |
536 | if (!ec || !data) |
537 | return -EINVAL; | |
6ccedb10 AS |
538 | /* |
539 | * Query the EC to find out which _Qxx method we need to evaluate. | |
540 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
541 | * bit to be cleared (and thus clearing the interrupt source). | |
542 | */ | |
a62e8f19 | 543 | result = acpi_ec_transaction_unlocked(ec, &t); |
6ccedb10 AS |
544 | if (result) |
545 | return result; | |
6ccedb10 AS |
546 | if (!d) |
547 | return -ENODATA; | |
6ccedb10 AS |
548 | *data = d; |
549 | return 0; | |
1da177e4 LT |
550 | } |
551 | ||
1da177e4 LT |
552 | /* -------------------------------------------------------------------------- |
553 | Event Management | |
554 | -------------------------------------------------------------------------- */ | |
837012ed AS |
555 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
556 | acpi_handle handle, acpi_ec_query_func func, | |
557 | void *data) | |
558 | { | |
559 | struct acpi_ec_query_handler *handler = | |
560 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
561 | if (!handler) | |
562 | return -ENOMEM; | |
563 | ||
564 | handler->query_bit = query_bit; | |
565 | handler->handle = handle; | |
566 | handler->func = func; | |
567 | handler->data = data; | |
f351d027 | 568 | mutex_lock(&ec->mutex); |
30c08574 | 569 | list_add(&handler->node, &ec->list); |
f351d027 | 570 | mutex_unlock(&ec->mutex); |
837012ed AS |
571 | return 0; |
572 | } | |
573 | ||
574 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); | |
575 | ||
576 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
577 | { | |
1544fdbc | 578 | struct acpi_ec_query_handler *handler, *tmp; |
f351d027 | 579 | mutex_lock(&ec->mutex); |
1544fdbc | 580 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
581 | if (query_bit == handler->query_bit) { |
582 | list_del(&handler->node); | |
583 | kfree(handler); | |
837012ed AS |
584 | } |
585 | } | |
f351d027 | 586 | mutex_unlock(&ec->mutex); |
837012ed AS |
587 | } |
588 | ||
589 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); | |
1da177e4 | 590 | |
a62e8f19 | 591 | static void acpi_ec_run(void *cxt) |
45bea155 | 592 | { |
a62e8f19 AS |
593 | struct acpi_ec_query_handler *handler = cxt; |
594 | if (!handler) | |
e41334c0 | 595 | return; |
16a26e85 | 596 | pr_debug("start query execution\n"); |
a62e8f19 AS |
597 | if (handler->func) |
598 | handler->func(handler->data); | |
599 | else if (handler->handle) | |
600 | acpi_evaluate_object(handler->handle, NULL, NULL, NULL); | |
16a26e85 | 601 | pr_debug("stop query execution\n"); |
a62e8f19 AS |
602 | kfree(handler); |
603 | } | |
604 | ||
3eba563e | 605 | static int acpi_ec_sync_query(struct acpi_ec *ec, u8 *data) |
a62e8f19 AS |
606 | { |
607 | u8 value = 0; | |
608 | int status; | |
609 | struct acpi_ec_query_handler *handler, *copy; | |
3eba563e KC |
610 | |
611 | status = acpi_ec_query_unlocked(ec, &value); | |
612 | if (data) | |
613 | *data = value; | |
614 | if (status) | |
a62e8f19 | 615 | return status; |
3eba563e | 616 | |
837012ed AS |
617 | list_for_each_entry(handler, &ec->list, node) { |
618 | if (value == handler->query_bit) { | |
619 | /* have custom handler for this bit */ | |
a62e8f19 AS |
620 | copy = kmalloc(sizeof(*handler), GFP_KERNEL); |
621 | if (!copy) | |
622 | return -ENOMEM; | |
623 | memcpy(copy, handler, sizeof(*copy)); | |
16a26e85 LT |
624 | pr_debug("push query execution (0x%2x) on queue\n", |
625 | value); | |
f5347867 AS |
626 | return acpi_os_execute((copy->func) ? |
627 | OSL_NOTIFY_HANDLER : OSL_GPE_HANDLER, | |
a62e8f19 | 628 | acpi_ec_run, copy); |
837012ed AS |
629 | } |
630 | } | |
a62e8f19 AS |
631 | return 0; |
632 | } | |
633 | ||
634 | static void acpi_ec_gpe_query(void *ec_cxt) | |
635 | { | |
636 | struct acpi_ec *ec = ec_cxt; | |
637 | if (!ec) | |
638 | return; | |
f351d027 | 639 | mutex_lock(&ec->mutex); |
3eba563e | 640 | acpi_ec_sync_query(ec, NULL); |
f351d027 | 641 | mutex_unlock(&ec->mutex); |
45bea155 | 642 | } |
1da177e4 | 643 | |
a62e8f19 AS |
644 | static int ec_check_sci(struct acpi_ec *ec, u8 state) |
645 | { | |
646 | if (state & ACPI_EC_FLAG_SCI) { | |
647 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) { | |
16a26e85 | 648 | pr_debug("push gpe query to the queue\n"); |
a62e8f19 AS |
649 | return acpi_os_execute(OSL_NOTIFY_HANDLER, |
650 | acpi_ec_gpe_query, ec); | |
651 | } | |
652 | } | |
653 | return 0; | |
654 | } | |
655 | ||
8b6cd8ad LM |
656 | static u32 acpi_ec_gpe_handler(acpi_handle gpe_device, |
657 | u32 gpe_number, void *data) | |
1da177e4 | 658 | { |
f92fca00 | 659 | unsigned long flags; |
3d02b90b | 660 | struct acpi_ec *ec = data; |
7c6db4e0 | 661 | |
f92fca00 | 662 | spin_lock_irqsave(&ec->lock, flags); |
c0d65341 | 663 | if (advance_transaction(ec)) |
2a84cb98 | 664 | wake_up(&ec->wait); |
c0d65341 LZ |
665 | spin_unlock_irqrestore(&ec->lock, flags); |
666 | ec_check_sci(ec, acpi_ec_read_status(ec)); | |
bba63a29 | 667 | return ACPI_INTERRUPT_HANDLED | ACPI_REENABLE_GPE; |
845625cd AS |
668 | } |
669 | ||
1da177e4 LT |
670 | /* -------------------------------------------------------------------------- |
671 | Address Space Management | |
672 | -------------------------------------------------------------------------- */ | |
673 | ||
1da177e4 | 674 | static acpi_status |
5b7734b4 | 675 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
dadf28a1 | 676 | u32 bits, u64 *value64, |
50526df6 | 677 | void *handler_context, void *region_context) |
1da177e4 | 678 | { |
3d02b90b | 679 | struct acpi_ec *ec = handler_context; |
dadf28a1 AS |
680 | int result = 0, i, bytes = bits / 8; |
681 | u8 *value = (u8 *)value64; | |
1da177e4 | 682 | |
1da177e4 | 683 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 684 | return AE_BAD_PARAMETER; |
1da177e4 | 685 | |
5b7734b4 | 686 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 687 | return AE_BAD_PARAMETER; |
1da177e4 | 688 | |
dadf28a1 | 689 | if (EC_FLAGS_MSI || bits > 8) |
6a63b06f | 690 | acpi_ec_burst_enable(ec); |
b3b233c7 | 691 | |
dadf28a1 AS |
692 | for (i = 0; i < bytes; ++i, ++address, ++value) |
693 | result = (function == ACPI_READ) ? | |
694 | acpi_ec_read(ec, address, value) : | |
695 | acpi_ec_write(ec, address, *value); | |
1da177e4 | 696 | |
dadf28a1 | 697 | if (EC_FLAGS_MSI || bits > 8) |
6a63b06f | 698 | acpi_ec_burst_disable(ec); |
b3b233c7 | 699 | |
1da177e4 LT |
700 | switch (result) { |
701 | case -EINVAL: | |
d550d98d | 702 | return AE_BAD_PARAMETER; |
1da177e4 LT |
703 | break; |
704 | case -ENODEV: | |
d550d98d | 705 | return AE_NOT_FOUND; |
1da177e4 LT |
706 | break; |
707 | case -ETIME: | |
d550d98d | 708 | return AE_TIME; |
1da177e4 LT |
709 | break; |
710 | default: | |
d550d98d | 711 | return AE_OK; |
1da177e4 | 712 | } |
1da177e4 LT |
713 | } |
714 | ||
1da177e4 LT |
715 | /* -------------------------------------------------------------------------- |
716 | Driver Interface | |
717 | -------------------------------------------------------------------------- */ | |
c0900c35 AS |
718 | static acpi_status |
719 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
720 | ||
c0900c35 AS |
721 | static struct acpi_ec *make_acpi_ec(void) |
722 | { | |
723 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
724 | if (!ec) | |
725 | return NULL; | |
080e412c | 726 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
f351d027 | 727 | mutex_init(&ec->mutex); |
c0900c35 | 728 | init_waitqueue_head(&ec->wait); |
837012ed | 729 | INIT_LIST_HEAD(&ec->list); |
f351d027 | 730 | spin_lock_init(&ec->lock); |
c0900c35 AS |
731 | return ec; |
732 | } | |
837012ed | 733 | |
c019b193 AS |
734 | static acpi_status |
735 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
736 | void *context, void **return_value) | |
737 | { | |
0175d562 LM |
738 | char node_name[5]; |
739 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
c019b193 AS |
740 | struct acpi_ec *ec = context; |
741 | int value = 0; | |
0175d562 LM |
742 | acpi_status status; |
743 | ||
744 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); | |
745 | ||
746 | if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) { | |
c019b193 AS |
747 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
748 | } | |
749 | return AE_OK; | |
750 | } | |
751 | ||
cd8c93a4 AS |
752 | static acpi_status |
753 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 754 | { |
cd8c93a4 | 755 | acpi_status status; |
d21cf3c1 | 756 | unsigned long long tmp = 0; |
cd8c93a4 AS |
757 | |
758 | struct acpi_ec *ec = context; | |
a5032bfd AS |
759 | |
760 | /* clear addr values, ec_parse_io_ports depend on it */ | |
761 | ec->command_addr = ec->data_addr = 0; | |
762 | ||
cd8c93a4 AS |
763 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
764 | ec_parse_io_ports, ec); | |
765 | if (ACPI_FAILURE(status)) | |
766 | return status; | |
837012ed AS |
767 | |
768 | /* Get GPE bit assignment (EC events). */ | |
769 | /* TODO: Add support for _GPE returning a package */ | |
27663c58 | 770 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
cd8c93a4 AS |
771 | if (ACPI_FAILURE(status)) |
772 | return status; | |
27663c58 | 773 | ec->gpe = tmp; |
837012ed | 774 | /* Use the global lock for all EC transactions? */ |
d21cf3c1 | 775 | tmp = 0; |
27663c58 MW |
776 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
777 | ec->global_lock = tmp; | |
837012ed | 778 | ec->handle = handle; |
cd8c93a4 | 779 | return AE_CTRL_TERMINATE; |
837012ed AS |
780 | } |
781 | ||
5efc5476 BH |
782 | static int ec_install_handlers(struct acpi_ec *ec) |
783 | { | |
784 | acpi_status status; | |
785 | if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) | |
786 | return 0; | |
787 | status = acpi_install_gpe_handler(NULL, ec->gpe, | |
788 | ACPI_GPE_EDGE_TRIGGERED, | |
789 | &acpi_ec_gpe_handler, ec); | |
790 | if (ACPI_FAILURE(status)) | |
791 | return -ENODEV; | |
9630bdd9 | 792 | |
a44061aa | 793 | acpi_enable_gpe(NULL, ec->gpe); |
5efc5476 BH |
794 | status = acpi_install_address_space_handler(ec->handle, |
795 | ACPI_ADR_SPACE_EC, | |
796 | &acpi_ec_space_handler, | |
797 | NULL, ec); | |
798 | if (ACPI_FAILURE(status)) { | |
799 | if (status == AE_NOT_FOUND) { | |
800 | /* | |
801 | * Maybe OS fails in evaluating the _REG object. | |
802 | * The AE_NOT_FOUND error will be ignored and OS | |
803 | * continue to initialize EC. | |
804 | */ | |
16a26e85 | 805 | pr_err("Fail in evaluating the _REG object" |
5efc5476 BH |
806 | " of EC device. Broken bios is suspected.\n"); |
807 | } else { | |
42b946bb | 808 | acpi_disable_gpe(NULL, ec->gpe); |
5efc5476 BH |
809 | acpi_remove_gpe_handler(NULL, ec->gpe, |
810 | &acpi_ec_gpe_handler); | |
811 | return -ENODEV; | |
812 | } | |
813 | } | |
814 | ||
815 | set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); | |
816 | return 0; | |
817 | } | |
818 | ||
4c611060 AS |
819 | static void ec_remove_handlers(struct acpi_ec *ec) |
820 | { | |
a44061aa | 821 | acpi_disable_gpe(NULL, ec->gpe); |
4c611060 AS |
822 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, |
823 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
16a26e85 | 824 | pr_err("failed to remove space handler\n"); |
4c611060 AS |
825 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
826 | &acpi_ec_gpe_handler))) | |
16a26e85 | 827 | pr_err("failed to remove gpe handler\n"); |
7c6db4e0 | 828 | clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
4c611060 AS |
829 | } |
830 | ||
703959d4 | 831 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 832 | { |
703959d4 | 833 | struct acpi_ec *ec = NULL; |
d02be047 | 834 | int ret; |
45bea155 | 835 | |
c0900c35 AS |
836 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
837 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
838 | ||
4c611060 | 839 | /* Check for boot EC */ |
ce52ddf5 AS |
840 | if (boot_ec && |
841 | (boot_ec->handle == device->handle || | |
842 | boot_ec->handle == ACPI_ROOT_OBJECT)) { | |
843 | ec = boot_ec; | |
844 | boot_ec = NULL; | |
845 | } else { | |
846 | ec = make_acpi_ec(); | |
847 | if (!ec) | |
848 | return -ENOMEM; | |
a5032bfd AS |
849 | } |
850 | if (ec_parse_device(device->handle, 0, ec, NULL) != | |
851 | AE_CTRL_TERMINATE) { | |
ce52ddf5 AS |
852 | kfree(ec); |
853 | return -EINVAL; | |
4c611060 AS |
854 | } |
855 | ||
ce52ddf5 AS |
856 | /* Find and register all query methods */ |
857 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
2263576c | 858 | acpi_ec_register_query_methods, NULL, ec, NULL); |
ce52ddf5 | 859 | |
4c611060 AS |
860 | if (!first_ec) |
861 | first_ec = ec; | |
db89b4f0 | 862 | device->driver_data = ec; |
de4f1046 | 863 | |
d6795fe3 AK |
864 | ret = !!request_region(ec->data_addr, 1, "EC data"); |
865 | WARN(!ret, "Could not request EC data io port 0x%lx", ec->data_addr); | |
866 | ret = !!request_region(ec->command_addr, 1, "EC cmd"); | |
867 | WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr); | |
de4f1046 | 868 | |
16a26e85 | 869 | pr_info("GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 870 | ec->gpe, ec->command_addr, ec->data_addr); |
5efc5476 BH |
871 | |
872 | ret = ec_install_handlers(ec); | |
873 | ||
874 | /* EC is fully operational, allow queries */ | |
875 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); | |
ad332c8a KC |
876 | |
877 | /* Clear stale _Q events if hardware might require that */ | |
878 | if (EC_FLAGS_CLEAR_ON_RESUME) { | |
879 | mutex_lock(&ec->mutex); | |
880 | acpi_ec_clear(ec); | |
881 | mutex_unlock(&ec->mutex); | |
882 | } | |
5efc5476 | 883 | return ret; |
1da177e4 LT |
884 | } |
885 | ||
51fac838 | 886 | static int acpi_ec_remove(struct acpi_device *device) |
1da177e4 | 887 | { |
01f22462 | 888 | struct acpi_ec *ec; |
07ddf768 | 889 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 890 | |
1da177e4 | 891 | if (!device) |
d550d98d | 892 | return -EINVAL; |
1da177e4 LT |
893 | |
894 | ec = acpi_driver_data(device); | |
cf745ec7 | 895 | ec_remove_handlers(ec); |
f351d027 | 896 | mutex_lock(&ec->mutex); |
07ddf768 | 897 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
898 | list_del(&handler->node); |
899 | kfree(handler); | |
900 | } | |
f351d027 | 901 | mutex_unlock(&ec->mutex); |
de4f1046 TR |
902 | release_region(ec->data_addr, 1); |
903 | release_region(ec->command_addr, 1); | |
db89b4f0 | 904 | device->driver_data = NULL; |
d033879c | 905 | if (ec == first_ec) |
c0900c35 | 906 | first_ec = NULL; |
4c611060 | 907 | kfree(ec); |
d550d98d | 908 | return 0; |
1da177e4 LT |
909 | } |
910 | ||
1da177e4 | 911 | static acpi_status |
c0900c35 | 912 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 913 | { |
3d02b90b | 914 | struct acpi_ec *ec = context; |
1da177e4 | 915 | |
01f22462 | 916 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 917 | return AE_OK; |
1da177e4 LT |
918 | |
919 | /* | |
920 | * The first address region returned is the data port, and | |
921 | * the second address region returned is the status/command | |
922 | * port. | |
923 | */ | |
de4f1046 | 924 | if (ec->data_addr == 0) |
6ffb221a | 925 | ec->data_addr = resource->data.io.minimum; |
de4f1046 | 926 | else if (ec->command_addr == 0) |
6ffb221a | 927 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 928 | else |
1da177e4 | 929 | return AE_CTRL_TERMINATE; |
1da177e4 | 930 | |
1da177e4 LT |
931 | return AE_OK; |
932 | } | |
933 | ||
c04209a7 AS |
934 | int __init acpi_boot_ec_enable(void) |
935 | { | |
7c6db4e0 | 936 | if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags)) |
c04209a7 AS |
937 | return 0; |
938 | if (!ec_install_handlers(boot_ec)) { | |
939 | first_ec = boot_ec; | |
940 | return 0; | |
941 | } | |
942 | return -EFAULT; | |
943 | } | |
944 | ||
223883b7 AS |
945 | static const struct acpi_device_id ec_device_ids[] = { |
946 | {"PNP0C09", 0}, | |
947 | {"", 0}, | |
948 | }; | |
949 | ||
478fa03b AS |
950 | /* Some BIOS do not survive early DSDT scan, skip it */ |
951 | static int ec_skip_dsdt_scan(const struct dmi_system_id *id) | |
952 | { | |
953 | EC_FLAGS_SKIP_DSDT_SCAN = 1; | |
954 | return 0; | |
955 | } | |
956 | ||
0adf3c74 AS |
957 | /* ASUStek often supplies us with broken ECDT, validate it */ |
958 | static int ec_validate_ecdt(const struct dmi_system_id *id) | |
959 | { | |
960 | EC_FLAGS_VALIDATE_ECDT = 1; | |
961 | return 0; | |
962 | } | |
963 | ||
964 | /* MSI EC needs special treatment, enable it */ | |
965 | static int ec_flag_msi(const struct dmi_system_id *id) | |
966 | { | |
16a26e85 | 967 | pr_debug("Detected MSI hardware, enabling workarounds.\n"); |
0adf3c74 AS |
968 | EC_FLAGS_MSI = 1; |
969 | EC_FLAGS_VALIDATE_ECDT = 1; | |
970 | return 0; | |
971 | } | |
972 | ||
67bfa9b6 FT |
973 | /* |
974 | * Clevo M720 notebook actually works ok with IRQ mode, if we lifted | |
975 | * the GPE storm threshold back to 20 | |
976 | */ | |
977 | static int ec_enlarge_storm_threshold(const struct dmi_system_id *id) | |
978 | { | |
979 | pr_debug("Setting the EC GPE storm threshold to 20\n"); | |
980 | ec_storm_threshold = 20; | |
981 | return 0; | |
982 | } | |
983 | ||
ad332c8a KC |
984 | /* |
985 | * On some hardware it is necessary to clear events accumulated by the EC during | |
986 | * sleep. These ECs stop reporting GPEs until they are manually polled, if too | |
987 | * many events are accumulated. (e.g. Samsung Series 5/9 notebooks) | |
988 | * | |
989 | * https://bugzilla.kernel.org/show_bug.cgi?id=44161 | |
990 | * | |
991 | * Ideally, the EC should also be instructed NOT to accumulate events during | |
992 | * sleep (which Windows seems to do somehow), but the interface to control this | |
993 | * behaviour is not known at this time. | |
994 | * | |
995 | * Models known to be affected are Samsung 530Uxx/535Uxx/540Uxx/550Pxx/900Xxx, | |
996 | * however it is very likely that other Samsung models are affected. | |
997 | * | |
998 | * On systems which don't accumulate _Q events during sleep, this extra check | |
999 | * should be harmless. | |
1000 | */ | |
1001 | static int ec_clear_on_resume(const struct dmi_system_id *id) | |
1002 | { | |
1003 | pr_debug("Detected system needing EC poll on resume.\n"); | |
1004 | EC_FLAGS_CLEAR_ON_RESUME = 1; | |
1005 | return 0; | |
1006 | } | |
1007 | ||
6cef7497 | 1008 | static struct dmi_system_id ec_dmi_table[] __initdata = { |
478fa03b AS |
1009 | { |
1010 | ec_skip_dsdt_scan, "Compal JFL92", { | |
1011 | DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"), | |
1012 | DMI_MATCH(DMI_BOARD_NAME, "JFL92") }, NULL}, | |
0adf3c74 AS |
1013 | { |
1014 | ec_flag_msi, "MSI hardware", { | |
55b313f2 AS |
1015 | DMI_MATCH(DMI_BIOS_VENDOR, "Micro-Star")}, NULL}, |
1016 | { | |
1017 | ec_flag_msi, "MSI hardware", { | |
1018 | DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star")}, NULL}, | |
1019 | { | |
1020 | ec_flag_msi, "MSI hardware", { | |
1021 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-Star")}, NULL}, | |
0adf3c74 | 1022 | { |
a5dc4f89 AS |
1023 | ec_flag_msi, "MSI hardware", { |
1024 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-STAR")}, NULL}, | |
1025 | { | |
534bc4e3 ZR |
1026 | ec_flag_msi, "Quanta hardware", { |
1027 | DMI_MATCH(DMI_SYS_VENDOR, "Quanta"), | |
1028 | DMI_MATCH(DMI_PRODUCT_NAME, "TW8/SW8/DW8"),}, NULL}, | |
1029 | { | |
1030 | ec_flag_msi, "Quanta hardware", { | |
1031 | DMI_MATCH(DMI_SYS_VENDOR, "Quanta"), | |
1032 | DMI_MATCH(DMI_PRODUCT_NAME, "TW9/SW9"),}, NULL}, | |
1033 | { | |
777cb382 LT |
1034 | ec_flag_msi, "Clevo W350etq", { |
1035 | DMI_MATCH(DMI_SYS_VENDOR, "CLEVO CO."), | |
1036 | DMI_MATCH(DMI_PRODUCT_NAME, "W35_37ET"),}, NULL}, | |
1037 | { | |
0adf3c74 AS |
1038 | ec_validate_ecdt, "ASUS hardware", { |
1039 | DMI_MATCH(DMI_BIOS_VENDOR, "ASUS") }, NULL}, | |
af986d10 PC |
1040 | { |
1041 | ec_validate_ecdt, "ASUS hardware", { | |
1042 | DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc.") }, NULL}, | |
67bfa9b6 FT |
1043 | { |
1044 | ec_enlarge_storm_threshold, "CLEVO hardware", { | |
1045 | DMI_MATCH(DMI_SYS_VENDOR, "CLEVO Co."), | |
1046 | DMI_MATCH(DMI_PRODUCT_NAME, "M720T/M730T"),}, NULL}, | |
eff9a4b6 LT |
1047 | { |
1048 | ec_skip_dsdt_scan, "HP Folio 13", { | |
1049 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), | |
1050 | DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13"),}, NULL}, | |
524f42fa LT |
1051 | { |
1052 | ec_validate_ecdt, "ASUS hardware", { | |
1053 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTek Computer Inc."), | |
1054 | DMI_MATCH(DMI_PRODUCT_NAME, "L4R"),}, NULL}, | |
ad332c8a KC |
1055 | { |
1056 | ec_clear_on_resume, "Samsung hardware", { | |
1057 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD.")}, NULL}, | |
0adf3c74 AS |
1058 | {}, |
1059 | }; | |
1060 | ||
c0900c35 AS |
1061 | int __init acpi_ec_ecdt_probe(void) |
1062 | { | |
c0900c35 | 1063 | acpi_status status; |
c6cb0e87 | 1064 | struct acpi_ec *saved_ec = NULL; |
50526df6 | 1065 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 1066 | |
d66d969d AS |
1067 | boot_ec = make_acpi_ec(); |
1068 | if (!boot_ec) | |
c0900c35 AS |
1069 | return -ENOMEM; |
1070 | /* | |
1071 | * Generate a boot ec context | |
1072 | */ | |
0adf3c74 | 1073 | dmi_check_system(ec_dmi_table); |
15a58ed1 AS |
1074 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
1075 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 1076 | if (ACPI_SUCCESS(status)) { |
16a26e85 | 1077 | pr_info("EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
1078 | boot_ec->command_addr = ecdt_ptr->control.address; |
1079 | boot_ec->data_addr = ecdt_ptr->data.address; | |
1080 | boot_ec->gpe = ecdt_ptr->gpe; | |
4af8e10a | 1081 | boot_ec->handle = ACPI_ROOT_OBJECT; |
ce52ddf5 | 1082 | acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle); |
c6cb0e87 | 1083 | /* Don't trust ECDT, which comes from ASUSTek */ |
0adf3c74 | 1084 | if (!EC_FLAGS_VALIDATE_ECDT) |
c5279dee | 1085 | goto install; |
d6bd535d | 1086 | saved_ec = kmemdup(boot_ec, sizeof(struct acpi_ec), GFP_KERNEL); |
c6cb0e87 AS |
1087 | if (!saved_ec) |
1088 | return -ENOMEM; | |
c5279dee | 1089 | /* fall through */ |
cd8c93a4 | 1090 | } |
0adf3c74 | 1091 | |
ed4b197d CIK |
1092 | if (EC_FLAGS_SKIP_DSDT_SCAN) { |
1093 | kfree(saved_ec); | |
478fa03b | 1094 | return -ENODEV; |
ed4b197d | 1095 | } |
478fa03b | 1096 | |
c5279dee AS |
1097 | /* This workaround is needed only on some broken machines, |
1098 | * which require early EC, but fail to provide ECDT */ | |
16a26e85 | 1099 | pr_debug("Look up EC in DSDT\n"); |
c5279dee AS |
1100 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, |
1101 | boot_ec, NULL); | |
1102 | /* Check that acpi_get_devices actually find something */ | |
1103 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
1104 | goto error; | |
c6cb0e87 AS |
1105 | if (saved_ec) { |
1106 | /* try to find good ECDT from ASUSTek */ | |
1107 | if (saved_ec->command_addr != boot_ec->command_addr || | |
1108 | saved_ec->data_addr != boot_ec->data_addr || | |
1109 | saved_ec->gpe != boot_ec->gpe || | |
1110 | saved_ec->handle != boot_ec->handle) | |
16a26e85 | 1111 | pr_info("ASUSTek keeps feeding us with broken " |
c6cb0e87 AS |
1112 | "ECDT tables, which are very hard to workaround. " |
1113 | "Trying to use DSDT EC info instead. Please send " | |
1114 | "output of acpidump to linux-acpi@vger.kernel.org\n"); | |
1115 | kfree(saved_ec); | |
1116 | saved_ec = NULL; | |
1117 | } else { | |
1118 | /* We really need to limit this workaround, the only ASUS, | |
1119 | * which needs it, has fake EC._INI method, so use it as flag. | |
1120 | * Keep boot_ec struct as it will be needed soon. | |
1121 | */ | |
c6cb0e87 | 1122 | if (!dmi_name_in_vendors("ASUS") || |
952c63e9 | 1123 | !acpi_has_method(boot_ec->handle, "_INI")) |
c6cb0e87 AS |
1124 | return -ENODEV; |
1125 | } | |
c5279dee AS |
1126 | install: |
1127 | if (!ec_install_handlers(boot_ec)) { | |
d033879c | 1128 | first_ec = boot_ec; |
e8284321 | 1129 | return 0; |
d033879c | 1130 | } |
c5279dee | 1131 | error: |
d66d969d | 1132 | kfree(boot_ec); |
ed4b197d | 1133 | kfree(saved_ec); |
d66d969d | 1134 | boot_ec = NULL; |
1da177e4 LT |
1135 | return -ENODEV; |
1136 | } | |
1137 | ||
223883b7 AS |
1138 | static struct acpi_driver acpi_ec_driver = { |
1139 | .name = "ec", | |
1140 | .class = ACPI_EC_CLASS, | |
1141 | .ids = ec_device_ids, | |
1142 | .ops = { | |
1143 | .add = acpi_ec_add, | |
1144 | .remove = acpi_ec_remove, | |
223883b7 AS |
1145 | }, |
1146 | }; | |
1147 | ||
a5f820fe | 1148 | int __init acpi_ec_init(void) |
1da177e4 | 1149 | { |
50526df6 | 1150 | int result = 0; |
1da177e4 | 1151 | |
1da177e4 LT |
1152 | /* Now register the driver for the EC */ |
1153 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
49c6c5ff | 1154 | if (result < 0) |
d550d98d | 1155 | return -ENODEV; |
1da177e4 | 1156 | |
d550d98d | 1157 | return result; |
1da177e4 LT |
1158 | } |
1159 | ||
1da177e4 LT |
1160 | /* EC driver currently not unloadable */ |
1161 | #if 0 | |
50526df6 | 1162 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1163 | { |
1da177e4 LT |
1164 | |
1165 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
d550d98d | 1166 | return; |
1da177e4 | 1167 | } |
7843932a | 1168 | #endif /* 0 */ |