Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
7c6db4e0 | 2 | * ec.c - ACPI Embedded Controller Driver (v2.1) |
1da177e4 | 3 | * |
7c6db4e0 | 4 | * Copyright (C) 2006-2008 Alexey Starikovskiy <astarikovskiy@suse.de> |
01f22462 | 5 | * Copyright (C) 2006 Denis Sadykov <denis.m.sadykov@intel.com> |
1da177e4 LT |
6 | * Copyright (C) 2004 Luming Yu <luming.yu@intel.com> |
7 | * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> | |
8 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> | |
9 | * | |
10 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2 of the License, or (at | |
15 | * your option) any later version. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, but | |
18 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
20 | * General Public License for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU General Public License along | |
23 | * with this program; if not, write to the Free Software Foundation, Inc., | |
24 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
25 | * | |
26 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
27 | */ | |
28 | ||
7c6db4e0 | 29 | /* Uncomment next line to get verbose printout */ |
d772b3b3 MN |
30 | /* #define DEBUG */ |
31 | ||
1da177e4 LT |
32 | #include <linux/kernel.h> |
33 | #include <linux/module.h> | |
34 | #include <linux/init.h> | |
35 | #include <linux/types.h> | |
36 | #include <linux/delay.h> | |
37 | #include <linux/proc_fs.h> | |
38 | #include <linux/seq_file.h> | |
451566f4 | 39 | #include <linux/interrupt.h> |
837012ed | 40 | #include <linux/list.h> |
7c6db4e0 | 41 | #include <linux/spinlock.h> |
1da177e4 LT |
42 | #include <asm/io.h> |
43 | #include <acpi/acpi_bus.h> | |
44 | #include <acpi/acpi_drivers.h> | |
45 | #include <acpi/actypes.h> | |
46 | ||
1da177e4 | 47 | #define ACPI_EC_CLASS "embedded_controller" |
1da177e4 LT |
48 | #define ACPI_EC_DEVICE_NAME "Embedded Controller" |
49 | #define ACPI_EC_FILE_INFO "info" | |
837012ed | 50 | |
af3fd140 AS |
51 | #undef PREFIX |
52 | #define PREFIX "ACPI: EC: " | |
4350933a | 53 | |
703959d4 | 54 | /* EC status register */ |
1da177e4 LT |
55 | #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */ |
56 | #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */ | |
451566f4 | 57 | #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */ |
1da177e4 | 58 | #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */ |
4350933a | 59 | |
703959d4 | 60 | /* EC commands */ |
3261ff4d | 61 | enum ec_command { |
6ccedb10 AS |
62 | ACPI_EC_COMMAND_READ = 0x80, |
63 | ACPI_EC_COMMAND_WRITE = 0x81, | |
64 | ACPI_EC_BURST_ENABLE = 0x82, | |
65 | ACPI_EC_BURST_DISABLE = 0x83, | |
66 | ACPI_EC_COMMAND_QUERY = 0x84, | |
3261ff4d | 67 | }; |
837012ed | 68 | |
5c406412 | 69 | #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */ |
703959d4 | 70 | #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ |
e6e82a30 | 71 | #define ACPI_EC_UDELAY 100 /* Wait 100us before polling EC again */ |
703959d4 | 72 | |
7c6db4e0 AS |
73 | #define ACPI_EC_STORM_THRESHOLD 20 /* number of false interrupts |
74 | per one transaction */ | |
75 | ||
080e412c | 76 | enum { |
080e412c | 77 | EC_FLAGS_QUERY_PENDING, /* Query is pending */ |
7c6db4e0 AS |
78 | EC_FLAGS_GPE_MODE, /* Expect GPE to be sent |
79 | * for status change */ | |
b77d81b2 | 80 | EC_FLAGS_NO_GPE, /* Don't use GPE mode */ |
7c6db4e0 AS |
81 | EC_FLAGS_GPE_STORM, /* GPE storm detected */ |
82 | EC_FLAGS_HANDLERS_INSTALLED /* Handlers for GPE and | |
83 | * OpReg are installed */ | |
1da177e4 | 84 | }; |
6ffb221a DS |
85 | |
86 | /* If we find an EC via the ECDT, we need to keep a ptr to its context */ | |
d033879c | 87 | /* External interfaces use first EC only, so remember */ |
837012ed AS |
88 | typedef int (*acpi_ec_query_func) (void *data); |
89 | ||
90 | struct acpi_ec_query_handler { | |
91 | struct list_head node; | |
92 | acpi_ec_query_func func; | |
93 | acpi_handle handle; | |
94 | void *data; | |
95 | u8 query_bit; | |
96 | }; | |
97 | ||
8463200a | 98 | struct transaction { |
7c6db4e0 AS |
99 | const u8 *wdata; |
100 | u8 *rdata; | |
101 | unsigned short irq_count; | |
8463200a | 102 | u8 command; |
7c6db4e0 AS |
103 | u8 wlen; |
104 | u8 rlen; | |
105 | }; | |
106 | ||
a854e08a | 107 | static struct acpi_ec { |
703959d4 | 108 | acpi_handle handle; |
a86e2772 | 109 | unsigned long gpe; |
6ffb221a DS |
110 | unsigned long command_addr; |
111 | unsigned long data_addr; | |
703959d4 | 112 | unsigned long global_lock; |
080e412c | 113 | unsigned long flags; |
c787a855 | 114 | struct mutex lock; |
703959d4 | 115 | wait_queue_head_t wait; |
837012ed | 116 | struct list_head list; |
8463200a AS |
117 | struct transaction *curr; |
118 | spinlock_t curr_lock; | |
d033879c | 119 | } *boot_ec, *first_ec; |
703959d4 | 120 | |
2500822b ZY |
121 | /* |
122 | * Some Asus system have exchanged ECDT data/command IO addresses. | |
123 | */ | |
124 | static int print_ecdt_error(const struct dmi_system_id *id) | |
125 | { | |
126 | printk(KERN_NOTICE PREFIX "%s detected - " | |
127 | "ECDT has exchanged control/data I/O address\n", | |
128 | id->ident); | |
129 | return 0; | |
130 | } | |
131 | ||
132 | static struct dmi_system_id __cpuinitdata ec_dmi_table[] = { | |
133 | { | |
134 | print_ecdt_error, "Asus L4R", { | |
135 | DMI_MATCH(DMI_BIOS_VERSION, "1008.006"), | |
136 | DMI_MATCH(DMI_PRODUCT_NAME, "L4R"), | |
137 | DMI_MATCH(DMI_BOARD_NAME, "L4R") }, NULL}, | |
138 | { | |
139 | print_ecdt_error, "Asus M6R", { | |
140 | DMI_MATCH(DMI_BIOS_VERSION, "0207"), | |
141 | DMI_MATCH(DMI_PRODUCT_NAME, "M6R"), | |
142 | DMI_MATCH(DMI_BOARD_NAME, "M6R") }, NULL}, | |
143 | {}, | |
144 | }; | |
145 | ||
1da177e4 LT |
146 | /* -------------------------------------------------------------------------- |
147 | Transaction Management | |
148 | -------------------------------------------------------------------------- */ | |
149 | ||
6ffb221a | 150 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 151 | { |
3ebe08a7 | 152 | u8 x = inb(ec->command_addr); |
86dae015 | 153 | pr_debug(PREFIX "---> status = 0x%2.2x\n", x); |
3ebe08a7 | 154 | return x; |
451566f4 DT |
155 | } |
156 | ||
6ffb221a | 157 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 158 | { |
3ebe08a7 | 159 | u8 x = inb(ec->data_addr); |
86dae015 | 160 | pr_debug(PREFIX "---> data = 0x%2.2x\n", x); |
7c6db4e0 | 161 | return x; |
7c6db5e5 DS |
162 | } |
163 | ||
6ffb221a | 164 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 165 | { |
86dae015 | 166 | pr_debug(PREFIX "<--- command = 0x%2.2x\n", command); |
6ffb221a | 167 | outb(command, ec->command_addr); |
45bea155 LY |
168 | } |
169 | ||
6ffb221a | 170 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 171 | { |
86dae015 | 172 | pr_debug(PREFIX "<--- data = 0x%2.2x\n", data); |
6ffb221a | 173 | outb(data, ec->data_addr); |
703959d4 | 174 | } |
45bea155 | 175 | |
7c6db4e0 | 176 | static int ec_transaction_done(struct acpi_ec *ec) |
6ffb221a | 177 | { |
7c6db4e0 AS |
178 | unsigned long flags; |
179 | int ret = 0; | |
8463200a AS |
180 | spin_lock_irqsave(&ec->curr_lock, flags); |
181 | if (!ec->curr || (!ec->curr->wlen && !ec->curr->rlen)) | |
7c6db4e0 | 182 | ret = 1; |
8463200a | 183 | spin_unlock_irqrestore(&ec->curr_lock, flags); |
7c6db4e0 | 184 | return ret; |
45bea155 | 185 | } |
451566f4 | 186 | |
7c6db4e0 | 187 | static void gpe_transaction(struct acpi_ec *ec, u8 status) |
7c6db5e5 | 188 | { |
7c6db4e0 | 189 | unsigned long flags; |
8463200a AS |
190 | spin_lock_irqsave(&ec->curr_lock, flags); |
191 | if (!ec->curr) | |
7c6db4e0 | 192 | goto unlock; |
8463200a | 193 | if (ec->curr->wlen > 0) { |
7c6db4e0 | 194 | if ((status & ACPI_EC_FLAG_IBF) == 0) { |
8463200a AS |
195 | acpi_ec_write_data(ec, *(ec->curr->wdata++)); |
196 | --ec->curr->wlen; | |
7c6db4e0 AS |
197 | } else |
198 | /* false interrupt, state didn't change */ | |
8463200a | 199 | ++ec->curr->irq_count; |
7c6db4e0 | 200 | |
8463200a | 201 | } else if (ec->curr->rlen > 0) { |
7c6db4e0 | 202 | if ((status & ACPI_EC_FLAG_OBF) == 1) { |
8463200a AS |
203 | *(ec->curr->rdata++) = acpi_ec_read_data(ec); |
204 | --ec->curr->rlen; | |
7c6db4e0 AS |
205 | } else |
206 | /* false interrupt, state didn't change */ | |
8463200a | 207 | ++ec->curr->irq_count; |
7c6db4e0 AS |
208 | } |
209 | unlock: | |
8463200a | 210 | spin_unlock_irqrestore(&ec->curr_lock, flags); |
845625cd | 211 | } |
03d1d99c | 212 | |
7c6db4e0 | 213 | static int acpi_ec_wait(struct acpi_ec *ec) |
845625cd | 214 | { |
7c6db4e0 AS |
215 | if (wait_event_timeout(ec->wait, ec_transaction_done(ec), |
216 | msecs_to_jiffies(ACPI_EC_DELAY))) | |
217 | return 0; | |
218 | /* missing GPEs, switch back to poll mode */ | |
219 | if (printk_ratelimit()) | |
220 | pr_info(PREFIX "missing confirmations, " | |
221 | "switch off interrupt mode.\n"); | |
b77d81b2 | 222 | set_bit(EC_FLAGS_NO_GPE, &ec->flags); |
845625cd | 223 | clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); |
7c6db4e0 | 224 | return 1; |
845625cd AS |
225 | } |
226 | ||
7c6db4e0 AS |
227 | static void acpi_ec_gpe_query(void *ec_cxt); |
228 | ||
229 | static int ec_check_sci(struct acpi_ec *ec, u8 state) | |
7c6db5e5 | 230 | { |
7c6db4e0 AS |
231 | if (state & ACPI_EC_FLAG_SCI) { |
232 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) | |
233 | return acpi_os_execute(OSL_EC_BURST_HANDLER, | |
234 | acpi_ec_gpe_query, ec); | |
235 | } | |
236 | return 0; | |
237 | } | |
238 | ||
239 | static int ec_poll(struct acpi_ec *ec) | |
240 | { | |
241 | unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); | |
242 | msleep(1); | |
243 | while (time_before(jiffies, delay)) { | |
244 | gpe_transaction(ec, acpi_ec_read_status(ec)); | |
245 | msleep(1); | |
246 | if (ec_transaction_done(ec)) | |
9d699ed9 | 247 | return 0; |
af3fd140 | 248 | } |
b77d81b2 | 249 | return -ETIME; |
1da177e4 LT |
250 | } |
251 | ||
8463200a AS |
252 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
253 | struct transaction *t, | |
00eb43a1 | 254 | int force_poll) |
45bea155 | 255 | { |
7c6db4e0 | 256 | unsigned long tmp; |
7c6db4e0 | 257 | int ret = 0; |
3ebe08a7 | 258 | pr_debug(PREFIX "transaction start\n"); |
7c6db4e0 AS |
259 | /* disable GPE during transaction if storm is detected */ |
260 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
261 | clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); | |
262 | acpi_disable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); | |
3576cf61 | 263 | } |
7c6db4e0 | 264 | /* start transaction */ |
8463200a | 265 | spin_lock_irqsave(&ec->curr_lock, tmp); |
7c6db4e0 | 266 | /* following two actions should be kept atomic */ |
8463200a AS |
267 | t->irq_count = 0; |
268 | ec->curr = t; | |
269 | acpi_ec_write_cmd(ec, ec->curr->command); | |
270 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) | |
080e412c | 271 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
8463200a | 272 | spin_unlock_irqrestore(&ec->curr_lock, tmp); |
7c6db4e0 AS |
273 | /* if we selected poll mode or failed in GPE-mode do a poll loop */ |
274 | if (force_poll || | |
275 | !test_bit(EC_FLAGS_GPE_MODE, &ec->flags) || | |
276 | acpi_ec_wait(ec)) | |
277 | ret = ec_poll(ec); | |
3ebe08a7 | 278 | pr_debug(PREFIX "transaction end\n"); |
8463200a AS |
279 | spin_lock_irqsave(&ec->curr_lock, tmp); |
280 | ec->curr = NULL; | |
281 | spin_unlock_irqrestore(&ec->curr_lock, tmp); | |
7c6db4e0 AS |
282 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { |
283 | /* check if we received SCI during transaction */ | |
284 | ec_check_sci(ec, acpi_ec_read_status(ec)); | |
285 | /* it is safe to enable GPE outside of transaction */ | |
286 | acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); | |
287 | } else if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags) && | |
8463200a | 288 | t->irq_count > ACPI_EC_STORM_THRESHOLD) { |
7c6db4e0 AS |
289 | pr_debug(PREFIX "GPE storm detected\n"); |
290 | set_bit(EC_FLAGS_GPE_STORM, &ec->flags); | |
291 | } | |
292 | return ret; | |
293 | } | |
294 | ||
295 | static int ec_check_ibf0(struct acpi_ec *ec) | |
296 | { | |
297 | u8 status = acpi_ec_read_status(ec); | |
298 | return (status & ACPI_EC_FLAG_IBF) == 0; | |
45bea155 LY |
299 | } |
300 | ||
8463200a | 301 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t, |
00eb43a1 | 302 | int force_poll) |
1da177e4 | 303 | { |
d7a76e4c | 304 | int status; |
50526df6 | 305 | u32 glk; |
8463200a | 306 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
d550d98d | 307 | return -EINVAL; |
8463200a AS |
308 | if (t->rdata) |
309 | memset(t->rdata, 0, t->rlen); | |
523953b4 | 310 | mutex_lock(&ec->lock); |
703959d4 | 311 | if (ec->global_lock) { |
1da177e4 | 312 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 313 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
314 | status = -ENODEV; |
315 | goto unlock; | |
c24e912b | 316 | } |
1da177e4 | 317 | } |
7c6db4e0 AS |
318 | if (!wait_event_timeout(ec->wait, ec_check_ibf0(ec), |
319 | msecs_to_jiffies(ACPI_EC_DELAY))) { | |
3ebe08a7 MN |
320 | pr_err(PREFIX "input buffer is not empty, " |
321 | "aborting transaction\n"); | |
7c6db4e0 | 322 | status = -ETIME; |
451566f4 | 323 | goto end; |
716e084e | 324 | } |
8463200a | 325 | status = acpi_ec_transaction_unlocked(ec, t, force_poll); |
7c6db4e0 | 326 | end: |
703959d4 | 327 | if (ec->global_lock) |
1da177e4 | 328 | acpi_release_global_lock(glk); |
7c6db4e0 | 329 | unlock: |
523953b4 | 330 | mutex_unlock(&ec->lock); |
d550d98d | 331 | return status; |
1da177e4 LT |
332 | } |
333 | ||
c45aac43 AS |
334 | /* |
335 | * Note: samsung nv5000 doesn't work with ec burst mode. | |
336 | * http://bugzilla.kernel.org/show_bug.cgi?id=4980 | |
337 | */ | |
338 | int acpi_ec_burst_enable(struct acpi_ec *ec) | |
339 | { | |
340 | u8 d; | |
8463200a AS |
341 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
342 | .wdata = NULL, .rdata = &d, | |
343 | .wlen = 0, .rlen = 1}; | |
344 | ||
345 | return acpi_ec_transaction(ec, &t, 0); | |
c45aac43 AS |
346 | } |
347 | ||
348 | int acpi_ec_burst_disable(struct acpi_ec *ec) | |
349 | { | |
8463200a AS |
350 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
351 | .wdata = NULL, .rdata = NULL, | |
352 | .wlen = 0, .rlen = 0}; | |
353 | ||
7c6db4e0 | 354 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
8463200a | 355 | acpi_ec_transaction(ec, &t, 0) : 0; |
c45aac43 AS |
356 | } |
357 | ||
6ccedb10 | 358 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) |
3576cf61 DS |
359 | { |
360 | int result; | |
361 | u8 d; | |
8463200a AS |
362 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
363 | .wdata = &address, .rdata = &d, | |
364 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 365 | |
8463200a | 366 | result = acpi_ec_transaction(ec, &t, 0); |
3576cf61 DS |
367 | *data = d; |
368 | return result; | |
369 | } | |
6ffb221a | 370 | |
3576cf61 DS |
371 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
372 | { | |
6ccedb10 | 373 | u8 wdata[2] = { address, data }; |
8463200a AS |
374 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
375 | .wdata = wdata, .rdata = NULL, | |
376 | .wlen = 2, .rlen = 0}; | |
377 | ||
378 | return acpi_ec_transaction(ec, &t, 0); | |
3576cf61 DS |
379 | } |
380 | ||
1da177e4 LT |
381 | /* |
382 | * Externally callable EC access functions. For now, assume 1 EC only | |
383 | */ | |
c45aac43 AS |
384 | int ec_burst_enable(void) |
385 | { | |
c45aac43 AS |
386 | if (!first_ec) |
387 | return -ENODEV; | |
d033879c | 388 | return acpi_ec_burst_enable(first_ec); |
c45aac43 AS |
389 | } |
390 | ||
391 | EXPORT_SYMBOL(ec_burst_enable); | |
392 | ||
393 | int ec_burst_disable(void) | |
394 | { | |
c45aac43 AS |
395 | if (!first_ec) |
396 | return -ENODEV; | |
d033879c | 397 | return acpi_ec_burst_disable(first_ec); |
c45aac43 AS |
398 | } |
399 | ||
400 | EXPORT_SYMBOL(ec_burst_disable); | |
401 | ||
6ccedb10 | 402 | int ec_read(u8 addr, u8 * val) |
1da177e4 | 403 | { |
1da177e4 | 404 | int err; |
6ffb221a | 405 | u8 temp_data; |
1da177e4 LT |
406 | |
407 | if (!first_ec) | |
408 | return -ENODEV; | |
409 | ||
d033879c | 410 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
411 | |
412 | if (!err) { | |
413 | *val = temp_data; | |
414 | return 0; | |
50526df6 | 415 | } else |
1da177e4 LT |
416 | return err; |
417 | } | |
50526df6 | 418 | |
1da177e4 LT |
419 | EXPORT_SYMBOL(ec_read); |
420 | ||
50526df6 | 421 | int ec_write(u8 addr, u8 val) |
1da177e4 | 422 | { |
1da177e4 LT |
423 | int err; |
424 | ||
425 | if (!first_ec) | |
426 | return -ENODEV; | |
427 | ||
d033879c | 428 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
429 | |
430 | return err; | |
431 | } | |
50526df6 | 432 | |
1da177e4 LT |
433 | EXPORT_SYMBOL(ec_write); |
434 | ||
616362de | 435 | int ec_transaction(u8 command, |
9e197219 | 436 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
437 | u8 * rdata, unsigned rdata_len, |
438 | int force_poll) | |
45bea155 | 439 | { |
8463200a AS |
440 | struct transaction t = {.command = command, |
441 | .wdata = wdata, .rdata = rdata, | |
442 | .wlen = wdata_len, .rlen = rdata_len}; | |
d7a76e4c LP |
443 | if (!first_ec) |
444 | return -ENODEV; | |
45bea155 | 445 | |
8463200a | 446 | return acpi_ec_transaction(first_ec, &t, force_poll); |
45bea155 | 447 | } |
1da177e4 | 448 | |
ab9e43c6 LP |
449 | EXPORT_SYMBOL(ec_transaction); |
450 | ||
6ccedb10 | 451 | static int acpi_ec_query(struct acpi_ec *ec, u8 * data) |
3576cf61 DS |
452 | { |
453 | int result; | |
6ccedb10 | 454 | u8 d; |
8463200a AS |
455 | struct transaction t = {.command = ACPI_EC_COMMAND_QUERY, |
456 | .wdata = NULL, .rdata = &d, | |
457 | .wlen = 0, .rlen = 1}; | |
6ccedb10 AS |
458 | if (!ec || !data) |
459 | return -EINVAL; | |
1da177e4 | 460 | |
6ccedb10 AS |
461 | /* |
462 | * Query the EC to find out which _Qxx method we need to evaluate. | |
463 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
464 | * bit to be cleared (and thus clearing the interrupt source). | |
465 | */ | |
716e084e | 466 | |
8463200a | 467 | result = acpi_ec_transaction(ec, &t, 0); |
6ccedb10 AS |
468 | if (result) |
469 | return result; | |
1da177e4 | 470 | |
6ccedb10 AS |
471 | if (!d) |
472 | return -ENODATA; | |
1da177e4 | 473 | |
6ccedb10 AS |
474 | *data = d; |
475 | return 0; | |
1da177e4 LT |
476 | } |
477 | ||
1da177e4 LT |
478 | /* -------------------------------------------------------------------------- |
479 | Event Management | |
480 | -------------------------------------------------------------------------- */ | |
837012ed AS |
481 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
482 | acpi_handle handle, acpi_ec_query_func func, | |
483 | void *data) | |
484 | { | |
485 | struct acpi_ec_query_handler *handler = | |
486 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
487 | if (!handler) | |
488 | return -ENOMEM; | |
489 | ||
490 | handler->query_bit = query_bit; | |
491 | handler->handle = handle; | |
492 | handler->func = func; | |
493 | handler->data = data; | |
494 | mutex_lock(&ec->lock); | |
30c08574 | 495 | list_add(&handler->node, &ec->list); |
837012ed AS |
496 | mutex_unlock(&ec->lock); |
497 | return 0; | |
498 | } | |
499 | ||
500 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); | |
501 | ||
502 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
503 | { | |
1544fdbc | 504 | struct acpi_ec_query_handler *handler, *tmp; |
837012ed | 505 | mutex_lock(&ec->lock); |
1544fdbc | 506 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
507 | if (query_bit == handler->query_bit) { |
508 | list_del(&handler->node); | |
509 | kfree(handler); | |
837012ed AS |
510 | } |
511 | } | |
512 | mutex_unlock(&ec->lock); | |
513 | } | |
514 | ||
515 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); | |
1da177e4 | 516 | |
50526df6 | 517 | static void acpi_ec_gpe_query(void *ec_cxt) |
45bea155 | 518 | { |
3d02b90b | 519 | struct acpi_ec *ec = ec_cxt; |
6ffb221a | 520 | u8 value = 0; |
837012ed | 521 | struct acpi_ec_query_handler *handler, copy; |
45bea155 | 522 | |
5d0c288b | 523 | if (!ec || acpi_ec_query(ec, &value)) |
e41334c0 | 524 | return; |
837012ed AS |
525 | mutex_lock(&ec->lock); |
526 | list_for_each_entry(handler, &ec->list, node) { | |
527 | if (value == handler->query_bit) { | |
528 | /* have custom handler for this bit */ | |
529 | memcpy(©, handler, sizeof(copy)); | |
530 | mutex_unlock(&ec->lock); | |
531 | if (copy.func) { | |
532 | copy.func(copy.data); | |
533 | } else if (copy.handle) { | |
534 | acpi_evaluate_object(copy.handle, NULL, NULL, NULL); | |
535 | } | |
536 | return; | |
537 | } | |
538 | } | |
539 | mutex_unlock(&ec->lock); | |
45bea155 | 540 | } |
1da177e4 | 541 | |
50526df6 | 542 | static u32 acpi_ec_gpe_handler(void *data) |
1da177e4 | 543 | { |
3d02b90b | 544 | struct acpi_ec *ec = data; |
7c6db4e0 | 545 | u8 status; |
00eb43a1 | 546 | |
3ebe08a7 | 547 | pr_debug(PREFIX "~~~> interrupt\n"); |
7c6db4e0 AS |
548 | status = acpi_ec_read_status(ec); |
549 | ||
550 | gpe_transaction(ec, status); | |
551 | if (ec_transaction_done(ec) && (status & ACPI_EC_FLAG_IBF) == 0) | |
af3fd140 | 552 | wake_up(&ec->wait); |
451566f4 | 553 | |
7c6db4e0 AS |
554 | ec_check_sci(ec, status); |
555 | if (!test_bit(EC_FLAGS_GPE_MODE, &ec->flags) && | |
556 | !test_bit(EC_FLAGS_NO_GPE, &ec->flags)) { | |
95b937e3 | 557 | /* this is non-query, must be confirmation */ |
3ebe08a7 MN |
558 | if (printk_ratelimit()) |
559 | pr_info(PREFIX "non-query interrupt received," | |
560 | " switching to interrupt mode\n"); | |
7843932a | 561 | set_bit(EC_FLAGS_GPE_MODE, &ec->flags); |
95b937e3 | 562 | } |
7c6db4e0 | 563 | return ACPI_INTERRUPT_HANDLED; |
845625cd AS |
564 | } |
565 | ||
1da177e4 LT |
566 | /* -------------------------------------------------------------------------- |
567 | Address Space Management | |
568 | -------------------------------------------------------------------------- */ | |
569 | ||
1da177e4 | 570 | static acpi_status |
5b7734b4 AS |
571 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
572 | u32 bits, acpi_integer *value, | |
50526df6 | 573 | void *handler_context, void *region_context) |
1da177e4 | 574 | { |
3d02b90b | 575 | struct acpi_ec *ec = handler_context; |
3e71a87d | 576 | int result = 0, i; |
5b7734b4 | 577 | u8 temp = 0; |
1da177e4 | 578 | |
1da177e4 | 579 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 580 | return AE_BAD_PARAMETER; |
1da177e4 | 581 | |
5b7734b4 | 582 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 583 | return AE_BAD_PARAMETER; |
1da177e4 | 584 | |
5b7734b4 AS |
585 | if (bits != 8 && acpi_strict) |
586 | return AE_BAD_PARAMETER; | |
1da177e4 | 587 | |
b3b233c7 AS |
588 | acpi_ec_burst_enable(ec); |
589 | ||
3e71a87d AS |
590 | if (function == ACPI_READ) { |
591 | result = acpi_ec_read(ec, address, &temp); | |
592 | *value = temp; | |
593 | } else { | |
594 | temp = 0xff & (*value); | |
595 | result = acpi_ec_write(ec, address, temp); | |
596 | } | |
597 | ||
598 | for (i = 8; unlikely(bits - i > 0); i += 8) { | |
599 | ++address; | |
5b7734b4 AS |
600 | if (function == ACPI_READ) { |
601 | result = acpi_ec_read(ec, address, &temp); | |
602 | (*value) |= ((acpi_integer)temp) << i; | |
603 | } else { | |
604 | temp = 0xff & ((*value) >> i); | |
605 | result = acpi_ec_write(ec, address, temp); | |
606 | } | |
1da177e4 LT |
607 | } |
608 | ||
b3b233c7 AS |
609 | acpi_ec_burst_disable(ec); |
610 | ||
1da177e4 LT |
611 | switch (result) { |
612 | case -EINVAL: | |
d550d98d | 613 | return AE_BAD_PARAMETER; |
1da177e4 LT |
614 | break; |
615 | case -ENODEV: | |
d550d98d | 616 | return AE_NOT_FOUND; |
1da177e4 LT |
617 | break; |
618 | case -ETIME: | |
d550d98d | 619 | return AE_TIME; |
1da177e4 LT |
620 | break; |
621 | default: | |
d550d98d | 622 | return AE_OK; |
1da177e4 | 623 | } |
1da177e4 LT |
624 | } |
625 | ||
1da177e4 LT |
626 | /* -------------------------------------------------------------------------- |
627 | FS Interface (/proc) | |
628 | -------------------------------------------------------------------------- */ | |
629 | ||
50526df6 | 630 | static struct proc_dir_entry *acpi_ec_dir; |
1da177e4 | 631 | |
50526df6 | 632 | static int acpi_ec_read_info(struct seq_file *seq, void *offset) |
1da177e4 | 633 | { |
3d02b90b | 634 | struct acpi_ec *ec = seq->private; |
1da177e4 | 635 | |
1da177e4 LT |
636 | if (!ec) |
637 | goto end; | |
638 | ||
01f22462 AS |
639 | seq_printf(seq, "gpe:\t\t\t0x%02x\n", (u32) ec->gpe); |
640 | seq_printf(seq, "ports:\t\t\t0x%02x, 0x%02x\n", | |
641 | (unsigned)ec->command_addr, (unsigned)ec->data_addr); | |
642 | seq_printf(seq, "use global lock:\t%s\n", | |
703959d4 | 643 | ec->global_lock ? "yes" : "no"); |
50526df6 | 644 | end: |
d550d98d | 645 | return 0; |
1da177e4 LT |
646 | } |
647 | ||
648 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) | |
649 | { | |
650 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); | |
651 | } | |
652 | ||
703959d4 | 653 | static struct file_operations acpi_ec_info_ops = { |
50526df6 LB |
654 | .open = acpi_ec_info_open_fs, |
655 | .read = seq_read, | |
656 | .llseek = seq_lseek, | |
657 | .release = single_release, | |
1da177e4 LT |
658 | .owner = THIS_MODULE, |
659 | }; | |
660 | ||
50526df6 | 661 | static int acpi_ec_add_fs(struct acpi_device *device) |
1da177e4 | 662 | { |
50526df6 | 663 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 664 | |
1da177e4 LT |
665 | if (!acpi_device_dir(device)) { |
666 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
50526df6 | 667 | acpi_ec_dir); |
1da177e4 | 668 | if (!acpi_device_dir(device)) |
d550d98d | 669 | return -ENODEV; |
1da177e4 LT |
670 | } |
671 | ||
cf7acfab DL |
672 | entry = proc_create_data(ACPI_EC_FILE_INFO, S_IRUGO, |
673 | acpi_device_dir(device), | |
674 | &acpi_ec_info_ops, acpi_driver_data(device)); | |
1da177e4 | 675 | if (!entry) |
d550d98d | 676 | return -ENODEV; |
d550d98d | 677 | return 0; |
1da177e4 LT |
678 | } |
679 | ||
50526df6 | 680 | static int acpi_ec_remove_fs(struct acpi_device *device) |
1da177e4 | 681 | { |
1da177e4 LT |
682 | |
683 | if (acpi_device_dir(device)) { | |
684 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); | |
685 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); | |
686 | acpi_device_dir(device) = NULL; | |
687 | } | |
688 | ||
d550d98d | 689 | return 0; |
1da177e4 LT |
690 | } |
691 | ||
1da177e4 LT |
692 | /* -------------------------------------------------------------------------- |
693 | Driver Interface | |
694 | -------------------------------------------------------------------------- */ | |
c0900c35 AS |
695 | static acpi_status |
696 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
697 | ||
c0900c35 AS |
698 | static struct acpi_ec *make_acpi_ec(void) |
699 | { | |
700 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
701 | if (!ec) | |
702 | return NULL; | |
080e412c | 703 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
c0900c35 AS |
704 | mutex_init(&ec->lock); |
705 | init_waitqueue_head(&ec->wait); | |
837012ed | 706 | INIT_LIST_HEAD(&ec->list); |
8463200a | 707 | spin_lock_init(&ec->curr_lock); |
c0900c35 AS |
708 | return ec; |
709 | } | |
837012ed | 710 | |
c019b193 AS |
711 | static acpi_status |
712 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
713 | void *context, void **return_value) | |
714 | { | |
715 | struct acpi_namespace_node *node = handle; | |
716 | struct acpi_ec *ec = context; | |
717 | int value = 0; | |
718 | if (sscanf(node->name.ascii, "_Q%x", &value) == 1) { | |
719 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); | |
720 | } | |
721 | return AE_OK; | |
722 | } | |
723 | ||
cd8c93a4 AS |
724 | static acpi_status |
725 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 726 | { |
cd8c93a4 AS |
727 | acpi_status status; |
728 | ||
729 | struct acpi_ec *ec = context; | |
730 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, | |
731 | ec_parse_io_ports, ec); | |
732 | if (ACPI_FAILURE(status)) | |
733 | return status; | |
837012ed AS |
734 | |
735 | /* Get GPE bit assignment (EC events). */ | |
736 | /* TODO: Add support for _GPE returning a package */ | |
cd8c93a4 AS |
737 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec->gpe); |
738 | if (ACPI_FAILURE(status)) | |
739 | return status; | |
837012ed AS |
740 | /* Use the global lock for all EC transactions? */ |
741 | acpi_evaluate_integer(handle, "_GLK", NULL, &ec->global_lock); | |
837012ed | 742 | ec->handle = handle; |
cd8c93a4 | 743 | return AE_CTRL_TERMINATE; |
837012ed AS |
744 | } |
745 | ||
4c611060 AS |
746 | static void ec_remove_handlers(struct acpi_ec *ec) |
747 | { | |
748 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, | |
749 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
3ebe08a7 | 750 | pr_err(PREFIX "failed to remove space handler\n"); |
4c611060 AS |
751 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
752 | &acpi_ec_gpe_handler))) | |
3ebe08a7 | 753 | pr_err(PREFIX "failed to remove gpe handler\n"); |
7c6db4e0 | 754 | clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
4c611060 AS |
755 | } |
756 | ||
703959d4 | 757 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 758 | { |
703959d4 | 759 | struct acpi_ec *ec = NULL; |
45bea155 | 760 | |
45bea155 | 761 | if (!device) |
d550d98d | 762 | return -EINVAL; |
c0900c35 AS |
763 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
764 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
765 | ||
4c611060 | 766 | /* Check for boot EC */ |
ce52ddf5 AS |
767 | if (boot_ec && |
768 | (boot_ec->handle == device->handle || | |
769 | boot_ec->handle == ACPI_ROOT_OBJECT)) { | |
770 | ec = boot_ec; | |
771 | boot_ec = NULL; | |
772 | } else { | |
773 | ec = make_acpi_ec(); | |
774 | if (!ec) | |
775 | return -ENOMEM; | |
776 | if (ec_parse_device(device->handle, 0, ec, NULL) != | |
777 | AE_CTRL_TERMINATE) { | |
778 | kfree(ec); | |
779 | return -EINVAL; | |
4c611060 AS |
780 | } |
781 | } | |
782 | ||
c0900c35 | 783 | ec->handle = device->handle; |
ce52ddf5 AS |
784 | |
785 | /* Find and register all query methods */ | |
786 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
787 | acpi_ec_register_query_methods, ec, NULL); | |
788 | ||
4c611060 AS |
789 | if (!first_ec) |
790 | first_ec = ec; | |
c0900c35 | 791 | acpi_driver_data(device) = ec; |
c0900c35 | 792 | acpi_ec_add_fs(device); |
3ebe08a7 | 793 | pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 794 | ec->gpe, ec->command_addr, ec->data_addr); |
3ebe08a7 | 795 | pr_info(PREFIX "driver started in %s mode\n", |
95b937e3 | 796 | (test_bit(EC_FLAGS_GPE_MODE, &ec->flags))?"interrupt":"poll"); |
c0900c35 | 797 | return 0; |
1da177e4 LT |
798 | } |
799 | ||
50526df6 | 800 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 801 | { |
01f22462 | 802 | struct acpi_ec *ec; |
07ddf768 | 803 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 804 | |
1da177e4 | 805 | if (!device) |
d550d98d | 806 | return -EINVAL; |
1da177e4 LT |
807 | |
808 | ec = acpi_driver_data(device); | |
837012ed | 809 | mutex_lock(&ec->lock); |
07ddf768 | 810 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
811 | list_del(&handler->node); |
812 | kfree(handler); | |
813 | } | |
814 | mutex_unlock(&ec->lock); | |
1da177e4 | 815 | acpi_ec_remove_fs(device); |
c0900c35 | 816 | acpi_driver_data(device) = NULL; |
d033879c | 817 | if (ec == first_ec) |
c0900c35 | 818 | first_ec = NULL; |
4c611060 | 819 | kfree(ec); |
d550d98d | 820 | return 0; |
1da177e4 LT |
821 | } |
822 | ||
1da177e4 | 823 | static acpi_status |
c0900c35 | 824 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 825 | { |
3d02b90b | 826 | struct acpi_ec *ec = context; |
1da177e4 | 827 | |
01f22462 | 828 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 829 | return AE_OK; |
1da177e4 LT |
830 | |
831 | /* | |
832 | * The first address region returned is the data port, and | |
833 | * the second address region returned is the status/command | |
834 | * port. | |
835 | */ | |
01f22462 | 836 | if (ec->data_addr == 0) |
6ffb221a | 837 | ec->data_addr = resource->data.io.minimum; |
01f22462 | 838 | else if (ec->command_addr == 0) |
6ffb221a | 839 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 840 | else |
1da177e4 | 841 | return AE_CTRL_TERMINATE; |
1da177e4 | 842 | |
1da177e4 LT |
843 | return AE_OK; |
844 | } | |
845 | ||
e8284321 AS |
846 | static int ec_install_handlers(struct acpi_ec *ec) |
847 | { | |
c0900c35 | 848 | acpi_status status; |
7c6db4e0 | 849 | if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) |
4c611060 | 850 | return 0; |
c0900c35 | 851 | status = acpi_install_gpe_handler(NULL, ec->gpe, |
7c6db4e0 AS |
852 | ACPI_GPE_EDGE_TRIGGERED, |
853 | &acpi_ec_gpe_handler, ec); | |
e8284321 AS |
854 | if (ACPI_FAILURE(status)) |
855 | return -ENODEV; | |
856 | acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); | |
857 | acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); | |
e8284321 AS |
858 | status = acpi_install_address_space_handler(ec->handle, |
859 | ACPI_ADR_SPACE_EC, | |
860 | &acpi_ec_space_handler, | |
6d9e1120 | 861 | NULL, ec); |
e8284321 AS |
862 | if (ACPI_FAILURE(status)) { |
863 | acpi_remove_gpe_handler(NULL, ec->gpe, &acpi_ec_gpe_handler); | |
864 | return -ENODEV; | |
865 | } | |
866 | ||
7c6db4e0 | 867 | set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
e8284321 AS |
868 | return 0; |
869 | } | |
870 | ||
50526df6 | 871 | static int acpi_ec_start(struct acpi_device *device) |
1da177e4 | 872 | { |
c0900c35 | 873 | struct acpi_ec *ec; |
837012ed | 874 | int ret = 0; |
1da177e4 | 875 | |
1da177e4 | 876 | if (!device) |
d550d98d | 877 | return -EINVAL; |
1da177e4 LT |
878 | |
879 | ec = acpi_driver_data(device); | |
880 | ||
881 | if (!ec) | |
d550d98d | 882 | return -EINVAL; |
1da177e4 | 883 | |
4c611060 | 884 | ret = ec_install_handlers(ec); |
837012ed AS |
885 | |
886 | /* EC is fully operational, allow queries */ | |
080e412c | 887 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
837012ed | 888 | return ret; |
1da177e4 LT |
889 | } |
890 | ||
50526df6 | 891 | static int acpi_ec_stop(struct acpi_device *device, int type) |
1da177e4 | 892 | { |
c0900c35 | 893 | struct acpi_ec *ec; |
1da177e4 | 894 | if (!device) |
d550d98d | 895 | return -EINVAL; |
1da177e4 | 896 | ec = acpi_driver_data(device); |
c0900c35 AS |
897 | if (!ec) |
898 | return -EINVAL; | |
4c611060 | 899 | ec_remove_handlers(ec); |
f9319f90 | 900 | |
d550d98d | 901 | return 0; |
1da177e4 LT |
902 | } |
903 | ||
c04209a7 AS |
904 | int __init acpi_boot_ec_enable(void) |
905 | { | |
7c6db4e0 | 906 | if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags)) |
c04209a7 AS |
907 | return 0; |
908 | if (!ec_install_handlers(boot_ec)) { | |
909 | first_ec = boot_ec; | |
910 | return 0; | |
911 | } | |
912 | return -EFAULT; | |
913 | } | |
914 | ||
223883b7 AS |
915 | static const struct acpi_device_id ec_device_ids[] = { |
916 | {"PNP0C09", 0}, | |
917 | {"", 0}, | |
918 | }; | |
919 | ||
c0900c35 AS |
920 | int __init acpi_ec_ecdt_probe(void) |
921 | { | |
922 | int ret; | |
923 | acpi_status status; | |
50526df6 | 924 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 925 | |
d66d969d AS |
926 | boot_ec = make_acpi_ec(); |
927 | if (!boot_ec) | |
c0900c35 AS |
928 | return -ENOMEM; |
929 | /* | |
930 | * Generate a boot ec context | |
931 | */ | |
15a58ed1 AS |
932 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
933 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 934 | if (ACPI_SUCCESS(status)) { |
3ebe08a7 | 935 | pr_info(PREFIX "EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
936 | boot_ec->command_addr = ecdt_ptr->control.address; |
937 | boot_ec->data_addr = ecdt_ptr->data.address; | |
2500822b ZY |
938 | if (dmi_check_system(ec_dmi_table)) { |
939 | /* | |
940 | * If the board falls into ec_dmi_table, it means | |
941 | * that ECDT table gives the incorrect command/status | |
942 | * & data I/O address. Just fix it. | |
943 | */ | |
944 | boot_ec->data_addr = ecdt_ptr->control.address; | |
945 | boot_ec->command_addr = ecdt_ptr->data.address; | |
946 | } | |
cd8c93a4 | 947 | boot_ec->gpe = ecdt_ptr->gpe; |
4af8e10a | 948 | boot_ec->handle = ACPI_ROOT_OBJECT; |
ce52ddf5 | 949 | acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle); |
cd8c93a4 | 950 | } else { |
5870a8cd AS |
951 | /* This workaround is needed only on some broken machines, |
952 | * which require early EC, but fail to provide ECDT */ | |
953 | acpi_handle x; | |
cd8c93a4 AS |
954 | printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n"); |
955 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, | |
956 | boot_ec, NULL); | |
2d8348b4 AS |
957 | /* Check that acpi_get_devices actually find something */ |
958 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
cd8c93a4 | 959 | goto error; |
5870a8cd AS |
960 | /* We really need to limit this workaround, the only ASUS, |
961 | * which needs it, has fake EC._INI method, so use it as flag. | |
c04209a7 | 962 | * Keep boot_ec struct as it will be needed soon. |
5870a8cd AS |
963 | */ |
964 | if (ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", &x))) | |
c04209a7 | 965 | return -ENODEV; |
cd8c93a4 | 966 | } |
1da177e4 | 967 | |
d66d969d | 968 | ret = ec_install_handlers(boot_ec); |
d033879c AS |
969 | if (!ret) { |
970 | first_ec = boot_ec; | |
e8284321 | 971 | return 0; |
d033879c | 972 | } |
c0900c35 | 973 | error: |
d66d969d AS |
974 | kfree(boot_ec); |
975 | boot_ec = NULL; | |
1da177e4 LT |
976 | return -ENODEV; |
977 | } | |
978 | ||
223883b7 AS |
979 | static int acpi_ec_suspend(struct acpi_device *device, pm_message_t state) |
980 | { | |
981 | struct acpi_ec *ec = acpi_driver_data(device); | |
982 | /* Stop using GPE */ | |
983 | set_bit(EC_FLAGS_NO_GPE, &ec->flags); | |
984 | clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); | |
985 | acpi_disable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); | |
986 | return 0; | |
987 | } | |
988 | ||
989 | static int acpi_ec_resume(struct acpi_device *device) | |
990 | { | |
991 | struct acpi_ec *ec = acpi_driver_data(device); | |
992 | /* Enable use of GPE back */ | |
993 | clear_bit(EC_FLAGS_NO_GPE, &ec->flags); | |
994 | acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); | |
995 | return 0; | |
996 | } | |
997 | ||
998 | static struct acpi_driver acpi_ec_driver = { | |
999 | .name = "ec", | |
1000 | .class = ACPI_EC_CLASS, | |
1001 | .ids = ec_device_ids, | |
1002 | .ops = { | |
1003 | .add = acpi_ec_add, | |
1004 | .remove = acpi_ec_remove, | |
1005 | .start = acpi_ec_start, | |
1006 | .stop = acpi_ec_stop, | |
1007 | .suspend = acpi_ec_suspend, | |
1008 | .resume = acpi_ec_resume, | |
1009 | }, | |
1010 | }; | |
1011 | ||
50526df6 | 1012 | static int __init acpi_ec_init(void) |
1da177e4 | 1013 | { |
50526df6 | 1014 | int result = 0; |
1da177e4 | 1015 | |
1da177e4 | 1016 | if (acpi_disabled) |
d550d98d | 1017 | return 0; |
1da177e4 LT |
1018 | |
1019 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); | |
1020 | if (!acpi_ec_dir) | |
d550d98d | 1021 | return -ENODEV; |
1da177e4 LT |
1022 | |
1023 | /* Now register the driver for the EC */ | |
1024 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
1025 | if (result < 0) { | |
1026 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
d550d98d | 1027 | return -ENODEV; |
1da177e4 LT |
1028 | } |
1029 | ||
d550d98d | 1030 | return result; |
1da177e4 LT |
1031 | } |
1032 | ||
1033 | subsys_initcall(acpi_ec_init); | |
1034 | ||
1035 | /* EC driver currently not unloadable */ | |
1036 | #if 0 | |
50526df6 | 1037 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1038 | { |
1da177e4 LT |
1039 | |
1040 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1041 | ||
1042 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
1043 | ||
d550d98d | 1044 | return; |
1da177e4 | 1045 | } |
7843932a | 1046 | #endif /* 0 */ |