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 | ||
c0ff1772 AS |
301 | static int ec_wait_ibf0(struct acpi_ec *ec) |
302 | { | |
303 | unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); | |
304 | /* interrupt wait manually if GPE mode is not active */ | |
305 | unsigned long timeout = test_bit(EC_FLAGS_GPE_MODE, &ec->flags) ? | |
306 | msecs_to_jiffies(ACPI_EC_DELAY) : msecs_to_jiffies(1); | |
307 | while (time_before(jiffies, delay)) | |
308 | if (wait_event_timeout(ec->wait, ec_check_ibf0(ec), timeout)) | |
309 | return 0; | |
310 | return -ETIME; | |
45bea155 LY |
311 | } |
312 | ||
8463200a | 313 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t, |
00eb43a1 | 314 | int force_poll) |
1da177e4 | 315 | { |
d7a76e4c | 316 | int status; |
50526df6 | 317 | u32 glk; |
8463200a | 318 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
d550d98d | 319 | return -EINVAL; |
8463200a AS |
320 | if (t->rdata) |
321 | memset(t->rdata, 0, t->rlen); | |
523953b4 | 322 | mutex_lock(&ec->lock); |
703959d4 | 323 | if (ec->global_lock) { |
1da177e4 | 324 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 325 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
326 | status = -ENODEV; |
327 | goto unlock; | |
c24e912b | 328 | } |
1da177e4 | 329 | } |
c0ff1772 | 330 | if (ec_wait_ibf0(ec)) { |
3ebe08a7 MN |
331 | pr_err(PREFIX "input buffer is not empty, " |
332 | "aborting transaction\n"); | |
7c6db4e0 | 333 | status = -ETIME; |
451566f4 | 334 | goto end; |
716e084e | 335 | } |
8463200a | 336 | status = acpi_ec_transaction_unlocked(ec, t, force_poll); |
7c6db4e0 | 337 | end: |
703959d4 | 338 | if (ec->global_lock) |
1da177e4 | 339 | acpi_release_global_lock(glk); |
7c6db4e0 | 340 | unlock: |
523953b4 | 341 | mutex_unlock(&ec->lock); |
d550d98d | 342 | return status; |
1da177e4 LT |
343 | } |
344 | ||
c45aac43 AS |
345 | /* |
346 | * Note: samsung nv5000 doesn't work with ec burst mode. | |
347 | * http://bugzilla.kernel.org/show_bug.cgi?id=4980 | |
348 | */ | |
349 | int acpi_ec_burst_enable(struct acpi_ec *ec) | |
350 | { | |
351 | u8 d; | |
8463200a AS |
352 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
353 | .wdata = NULL, .rdata = &d, | |
354 | .wlen = 0, .rlen = 1}; | |
355 | ||
356 | return acpi_ec_transaction(ec, &t, 0); | |
c45aac43 AS |
357 | } |
358 | ||
359 | int acpi_ec_burst_disable(struct acpi_ec *ec) | |
360 | { | |
8463200a AS |
361 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
362 | .wdata = NULL, .rdata = NULL, | |
363 | .wlen = 0, .rlen = 0}; | |
364 | ||
7c6db4e0 | 365 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
8463200a | 366 | acpi_ec_transaction(ec, &t, 0) : 0; |
c45aac43 AS |
367 | } |
368 | ||
6ccedb10 | 369 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) |
3576cf61 DS |
370 | { |
371 | int result; | |
372 | u8 d; | |
8463200a AS |
373 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
374 | .wdata = &address, .rdata = &d, | |
375 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 376 | |
8463200a | 377 | result = acpi_ec_transaction(ec, &t, 0); |
3576cf61 DS |
378 | *data = d; |
379 | return result; | |
380 | } | |
6ffb221a | 381 | |
3576cf61 DS |
382 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
383 | { | |
6ccedb10 | 384 | u8 wdata[2] = { address, data }; |
8463200a AS |
385 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
386 | .wdata = wdata, .rdata = NULL, | |
387 | .wlen = 2, .rlen = 0}; | |
388 | ||
389 | return acpi_ec_transaction(ec, &t, 0); | |
3576cf61 DS |
390 | } |
391 | ||
1da177e4 LT |
392 | /* |
393 | * Externally callable EC access functions. For now, assume 1 EC only | |
394 | */ | |
c45aac43 AS |
395 | int ec_burst_enable(void) |
396 | { | |
c45aac43 AS |
397 | if (!first_ec) |
398 | return -ENODEV; | |
d033879c | 399 | return acpi_ec_burst_enable(first_ec); |
c45aac43 AS |
400 | } |
401 | ||
402 | EXPORT_SYMBOL(ec_burst_enable); | |
403 | ||
404 | int ec_burst_disable(void) | |
405 | { | |
c45aac43 AS |
406 | if (!first_ec) |
407 | return -ENODEV; | |
d033879c | 408 | return acpi_ec_burst_disable(first_ec); |
c45aac43 AS |
409 | } |
410 | ||
411 | EXPORT_SYMBOL(ec_burst_disable); | |
412 | ||
6ccedb10 | 413 | int ec_read(u8 addr, u8 * val) |
1da177e4 | 414 | { |
1da177e4 | 415 | int err; |
6ffb221a | 416 | u8 temp_data; |
1da177e4 LT |
417 | |
418 | if (!first_ec) | |
419 | return -ENODEV; | |
420 | ||
d033879c | 421 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
422 | |
423 | if (!err) { | |
424 | *val = temp_data; | |
425 | return 0; | |
50526df6 | 426 | } else |
1da177e4 LT |
427 | return err; |
428 | } | |
50526df6 | 429 | |
1da177e4 LT |
430 | EXPORT_SYMBOL(ec_read); |
431 | ||
50526df6 | 432 | int ec_write(u8 addr, u8 val) |
1da177e4 | 433 | { |
1da177e4 LT |
434 | int err; |
435 | ||
436 | if (!first_ec) | |
437 | return -ENODEV; | |
438 | ||
d033879c | 439 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
440 | |
441 | return err; | |
442 | } | |
50526df6 | 443 | |
1da177e4 LT |
444 | EXPORT_SYMBOL(ec_write); |
445 | ||
616362de | 446 | int ec_transaction(u8 command, |
9e197219 | 447 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
448 | u8 * rdata, unsigned rdata_len, |
449 | int force_poll) | |
45bea155 | 450 | { |
8463200a AS |
451 | struct transaction t = {.command = command, |
452 | .wdata = wdata, .rdata = rdata, | |
453 | .wlen = wdata_len, .rlen = rdata_len}; | |
d7a76e4c LP |
454 | if (!first_ec) |
455 | return -ENODEV; | |
45bea155 | 456 | |
8463200a | 457 | return acpi_ec_transaction(first_ec, &t, force_poll); |
45bea155 | 458 | } |
1da177e4 | 459 | |
ab9e43c6 LP |
460 | EXPORT_SYMBOL(ec_transaction); |
461 | ||
6ccedb10 | 462 | static int acpi_ec_query(struct acpi_ec *ec, u8 * data) |
3576cf61 DS |
463 | { |
464 | int result; | |
6ccedb10 | 465 | u8 d; |
8463200a AS |
466 | struct transaction t = {.command = ACPI_EC_COMMAND_QUERY, |
467 | .wdata = NULL, .rdata = &d, | |
468 | .wlen = 0, .rlen = 1}; | |
6ccedb10 AS |
469 | if (!ec || !data) |
470 | return -EINVAL; | |
1da177e4 | 471 | |
6ccedb10 AS |
472 | /* |
473 | * Query the EC to find out which _Qxx method we need to evaluate. | |
474 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
475 | * bit to be cleared (and thus clearing the interrupt source). | |
476 | */ | |
716e084e | 477 | |
8463200a | 478 | result = acpi_ec_transaction(ec, &t, 0); |
6ccedb10 AS |
479 | if (result) |
480 | return result; | |
1da177e4 | 481 | |
6ccedb10 AS |
482 | if (!d) |
483 | return -ENODATA; | |
1da177e4 | 484 | |
6ccedb10 AS |
485 | *data = d; |
486 | return 0; | |
1da177e4 LT |
487 | } |
488 | ||
1da177e4 LT |
489 | /* -------------------------------------------------------------------------- |
490 | Event Management | |
491 | -------------------------------------------------------------------------- */ | |
837012ed AS |
492 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
493 | acpi_handle handle, acpi_ec_query_func func, | |
494 | void *data) | |
495 | { | |
496 | struct acpi_ec_query_handler *handler = | |
497 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
498 | if (!handler) | |
499 | return -ENOMEM; | |
500 | ||
501 | handler->query_bit = query_bit; | |
502 | handler->handle = handle; | |
503 | handler->func = func; | |
504 | handler->data = data; | |
505 | mutex_lock(&ec->lock); | |
30c08574 | 506 | list_add(&handler->node, &ec->list); |
837012ed AS |
507 | mutex_unlock(&ec->lock); |
508 | return 0; | |
509 | } | |
510 | ||
511 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); | |
512 | ||
513 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
514 | { | |
1544fdbc | 515 | struct acpi_ec_query_handler *handler, *tmp; |
837012ed | 516 | mutex_lock(&ec->lock); |
1544fdbc | 517 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
518 | if (query_bit == handler->query_bit) { |
519 | list_del(&handler->node); | |
520 | kfree(handler); | |
837012ed AS |
521 | } |
522 | } | |
523 | mutex_unlock(&ec->lock); | |
524 | } | |
525 | ||
526 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); | |
1da177e4 | 527 | |
50526df6 | 528 | static void acpi_ec_gpe_query(void *ec_cxt) |
45bea155 | 529 | { |
3d02b90b | 530 | struct acpi_ec *ec = ec_cxt; |
6ffb221a | 531 | u8 value = 0; |
837012ed | 532 | struct acpi_ec_query_handler *handler, copy; |
45bea155 | 533 | |
5d0c288b | 534 | if (!ec || acpi_ec_query(ec, &value)) |
e41334c0 | 535 | return; |
837012ed AS |
536 | mutex_lock(&ec->lock); |
537 | list_for_each_entry(handler, &ec->list, node) { | |
538 | if (value == handler->query_bit) { | |
539 | /* have custom handler for this bit */ | |
540 | memcpy(©, handler, sizeof(copy)); | |
541 | mutex_unlock(&ec->lock); | |
542 | if (copy.func) { | |
543 | copy.func(copy.data); | |
544 | } else if (copy.handle) { | |
545 | acpi_evaluate_object(copy.handle, NULL, NULL, NULL); | |
546 | } | |
547 | return; | |
548 | } | |
549 | } | |
550 | mutex_unlock(&ec->lock); | |
45bea155 | 551 | } |
1da177e4 | 552 | |
50526df6 | 553 | static u32 acpi_ec_gpe_handler(void *data) |
1da177e4 | 554 | { |
3d02b90b | 555 | struct acpi_ec *ec = data; |
7c6db4e0 | 556 | u8 status; |
00eb43a1 | 557 | |
3ebe08a7 | 558 | pr_debug(PREFIX "~~~> interrupt\n"); |
7c6db4e0 AS |
559 | status = acpi_ec_read_status(ec); |
560 | ||
561 | gpe_transaction(ec, status); | |
562 | if (ec_transaction_done(ec) && (status & ACPI_EC_FLAG_IBF) == 0) | |
af3fd140 | 563 | wake_up(&ec->wait); |
451566f4 | 564 | |
7c6db4e0 AS |
565 | ec_check_sci(ec, status); |
566 | if (!test_bit(EC_FLAGS_GPE_MODE, &ec->flags) && | |
567 | !test_bit(EC_FLAGS_NO_GPE, &ec->flags)) { | |
95b937e3 | 568 | /* this is non-query, must be confirmation */ |
3ebe08a7 MN |
569 | if (printk_ratelimit()) |
570 | pr_info(PREFIX "non-query interrupt received," | |
571 | " switching to interrupt mode\n"); | |
7843932a | 572 | set_bit(EC_FLAGS_GPE_MODE, &ec->flags); |
95b937e3 | 573 | } |
7c6db4e0 | 574 | return ACPI_INTERRUPT_HANDLED; |
845625cd AS |
575 | } |
576 | ||
1da177e4 LT |
577 | /* -------------------------------------------------------------------------- |
578 | Address Space Management | |
579 | -------------------------------------------------------------------------- */ | |
580 | ||
1da177e4 | 581 | static acpi_status |
5b7734b4 AS |
582 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
583 | u32 bits, acpi_integer *value, | |
50526df6 | 584 | void *handler_context, void *region_context) |
1da177e4 | 585 | { |
3d02b90b | 586 | struct acpi_ec *ec = handler_context; |
3e71a87d | 587 | int result = 0, i; |
5b7734b4 | 588 | u8 temp = 0; |
1da177e4 | 589 | |
1da177e4 | 590 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 591 | return AE_BAD_PARAMETER; |
1da177e4 | 592 | |
5b7734b4 | 593 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 594 | return AE_BAD_PARAMETER; |
1da177e4 | 595 | |
5b7734b4 AS |
596 | if (bits != 8 && acpi_strict) |
597 | return AE_BAD_PARAMETER; | |
1da177e4 | 598 | |
b3b233c7 AS |
599 | acpi_ec_burst_enable(ec); |
600 | ||
3e71a87d AS |
601 | if (function == ACPI_READ) { |
602 | result = acpi_ec_read(ec, address, &temp); | |
603 | *value = temp; | |
604 | } else { | |
605 | temp = 0xff & (*value); | |
606 | result = acpi_ec_write(ec, address, temp); | |
607 | } | |
608 | ||
609 | for (i = 8; unlikely(bits - i > 0); i += 8) { | |
610 | ++address; | |
5b7734b4 AS |
611 | if (function == ACPI_READ) { |
612 | result = acpi_ec_read(ec, address, &temp); | |
613 | (*value) |= ((acpi_integer)temp) << i; | |
614 | } else { | |
615 | temp = 0xff & ((*value) >> i); | |
616 | result = acpi_ec_write(ec, address, temp); | |
617 | } | |
1da177e4 LT |
618 | } |
619 | ||
b3b233c7 AS |
620 | acpi_ec_burst_disable(ec); |
621 | ||
1da177e4 LT |
622 | switch (result) { |
623 | case -EINVAL: | |
d550d98d | 624 | return AE_BAD_PARAMETER; |
1da177e4 LT |
625 | break; |
626 | case -ENODEV: | |
d550d98d | 627 | return AE_NOT_FOUND; |
1da177e4 LT |
628 | break; |
629 | case -ETIME: | |
d550d98d | 630 | return AE_TIME; |
1da177e4 LT |
631 | break; |
632 | default: | |
d550d98d | 633 | return AE_OK; |
1da177e4 | 634 | } |
1da177e4 LT |
635 | } |
636 | ||
1da177e4 LT |
637 | /* -------------------------------------------------------------------------- |
638 | FS Interface (/proc) | |
639 | -------------------------------------------------------------------------- */ | |
640 | ||
50526df6 | 641 | static struct proc_dir_entry *acpi_ec_dir; |
1da177e4 | 642 | |
50526df6 | 643 | static int acpi_ec_read_info(struct seq_file *seq, void *offset) |
1da177e4 | 644 | { |
3d02b90b | 645 | struct acpi_ec *ec = seq->private; |
1da177e4 | 646 | |
1da177e4 LT |
647 | if (!ec) |
648 | goto end; | |
649 | ||
01f22462 AS |
650 | seq_printf(seq, "gpe:\t\t\t0x%02x\n", (u32) ec->gpe); |
651 | seq_printf(seq, "ports:\t\t\t0x%02x, 0x%02x\n", | |
652 | (unsigned)ec->command_addr, (unsigned)ec->data_addr); | |
653 | seq_printf(seq, "use global lock:\t%s\n", | |
703959d4 | 654 | ec->global_lock ? "yes" : "no"); |
50526df6 | 655 | end: |
d550d98d | 656 | return 0; |
1da177e4 LT |
657 | } |
658 | ||
659 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) | |
660 | { | |
661 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); | |
662 | } | |
663 | ||
703959d4 | 664 | static struct file_operations acpi_ec_info_ops = { |
50526df6 LB |
665 | .open = acpi_ec_info_open_fs, |
666 | .read = seq_read, | |
667 | .llseek = seq_lseek, | |
668 | .release = single_release, | |
1da177e4 LT |
669 | .owner = THIS_MODULE, |
670 | }; | |
671 | ||
50526df6 | 672 | static int acpi_ec_add_fs(struct acpi_device *device) |
1da177e4 | 673 | { |
50526df6 | 674 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 675 | |
1da177e4 LT |
676 | if (!acpi_device_dir(device)) { |
677 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
50526df6 | 678 | acpi_ec_dir); |
1da177e4 | 679 | if (!acpi_device_dir(device)) |
d550d98d | 680 | return -ENODEV; |
1da177e4 LT |
681 | } |
682 | ||
cf7acfab DL |
683 | entry = proc_create_data(ACPI_EC_FILE_INFO, S_IRUGO, |
684 | acpi_device_dir(device), | |
685 | &acpi_ec_info_ops, acpi_driver_data(device)); | |
1da177e4 | 686 | if (!entry) |
d550d98d | 687 | return -ENODEV; |
d550d98d | 688 | return 0; |
1da177e4 LT |
689 | } |
690 | ||
50526df6 | 691 | static int acpi_ec_remove_fs(struct acpi_device *device) |
1da177e4 | 692 | { |
1da177e4 LT |
693 | |
694 | if (acpi_device_dir(device)) { | |
695 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); | |
696 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); | |
697 | acpi_device_dir(device) = NULL; | |
698 | } | |
699 | ||
d550d98d | 700 | return 0; |
1da177e4 LT |
701 | } |
702 | ||
1da177e4 LT |
703 | /* -------------------------------------------------------------------------- |
704 | Driver Interface | |
705 | -------------------------------------------------------------------------- */ | |
c0900c35 AS |
706 | static acpi_status |
707 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
708 | ||
c0900c35 AS |
709 | static struct acpi_ec *make_acpi_ec(void) |
710 | { | |
711 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
712 | if (!ec) | |
713 | return NULL; | |
080e412c | 714 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
c0900c35 AS |
715 | mutex_init(&ec->lock); |
716 | init_waitqueue_head(&ec->wait); | |
837012ed | 717 | INIT_LIST_HEAD(&ec->list); |
8463200a | 718 | spin_lock_init(&ec->curr_lock); |
c0900c35 AS |
719 | return ec; |
720 | } | |
837012ed | 721 | |
c019b193 AS |
722 | static acpi_status |
723 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
724 | void *context, void **return_value) | |
725 | { | |
726 | struct acpi_namespace_node *node = handle; | |
727 | struct acpi_ec *ec = context; | |
728 | int value = 0; | |
729 | if (sscanf(node->name.ascii, "_Q%x", &value) == 1) { | |
730 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); | |
731 | } | |
732 | return AE_OK; | |
733 | } | |
734 | ||
cd8c93a4 AS |
735 | static acpi_status |
736 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 737 | { |
cd8c93a4 | 738 | acpi_status status; |
27663c58 | 739 | unsigned long long tmp; |
cd8c93a4 AS |
740 | |
741 | struct acpi_ec *ec = context; | |
742 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, | |
743 | ec_parse_io_ports, ec); | |
744 | if (ACPI_FAILURE(status)) | |
745 | return status; | |
837012ed AS |
746 | |
747 | /* Get GPE bit assignment (EC events). */ | |
748 | /* TODO: Add support for _GPE returning a package */ | |
27663c58 | 749 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
cd8c93a4 AS |
750 | if (ACPI_FAILURE(status)) |
751 | return status; | |
27663c58 | 752 | ec->gpe = tmp; |
837012ed | 753 | /* Use the global lock for all EC transactions? */ |
27663c58 MW |
754 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
755 | ec->global_lock = tmp; | |
837012ed | 756 | ec->handle = handle; |
cd8c93a4 | 757 | return AE_CTRL_TERMINATE; |
837012ed AS |
758 | } |
759 | ||
4c611060 AS |
760 | static void ec_remove_handlers(struct acpi_ec *ec) |
761 | { | |
762 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, | |
763 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
3ebe08a7 | 764 | pr_err(PREFIX "failed to remove space handler\n"); |
4c611060 AS |
765 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
766 | &acpi_ec_gpe_handler))) | |
3ebe08a7 | 767 | pr_err(PREFIX "failed to remove gpe handler\n"); |
7c6db4e0 | 768 | clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
4c611060 AS |
769 | } |
770 | ||
703959d4 | 771 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 772 | { |
703959d4 | 773 | struct acpi_ec *ec = NULL; |
45bea155 | 774 | |
45bea155 | 775 | if (!device) |
d550d98d | 776 | return -EINVAL; |
c0900c35 AS |
777 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
778 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
779 | ||
4c611060 | 780 | /* Check for boot EC */ |
ce52ddf5 AS |
781 | if (boot_ec && |
782 | (boot_ec->handle == device->handle || | |
783 | boot_ec->handle == ACPI_ROOT_OBJECT)) { | |
784 | ec = boot_ec; | |
785 | boot_ec = NULL; | |
786 | } else { | |
787 | ec = make_acpi_ec(); | |
788 | if (!ec) | |
789 | return -ENOMEM; | |
790 | if (ec_parse_device(device->handle, 0, ec, NULL) != | |
791 | AE_CTRL_TERMINATE) { | |
792 | kfree(ec); | |
793 | return -EINVAL; | |
4c611060 AS |
794 | } |
795 | } | |
796 | ||
c0900c35 | 797 | ec->handle = device->handle; |
ce52ddf5 AS |
798 | |
799 | /* Find and register all query methods */ | |
800 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
801 | acpi_ec_register_query_methods, ec, NULL); | |
802 | ||
4c611060 AS |
803 | if (!first_ec) |
804 | first_ec = ec; | |
db89b4f0 | 805 | device->driver_data = ec; |
c0900c35 | 806 | acpi_ec_add_fs(device); |
3ebe08a7 | 807 | pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 808 | ec->gpe, ec->command_addr, ec->data_addr); |
3ebe08a7 | 809 | pr_info(PREFIX "driver started in %s mode\n", |
95b937e3 | 810 | (test_bit(EC_FLAGS_GPE_MODE, &ec->flags))?"interrupt":"poll"); |
c0900c35 | 811 | return 0; |
1da177e4 LT |
812 | } |
813 | ||
50526df6 | 814 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 815 | { |
01f22462 | 816 | struct acpi_ec *ec; |
07ddf768 | 817 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 818 | |
1da177e4 | 819 | if (!device) |
d550d98d | 820 | return -EINVAL; |
1da177e4 LT |
821 | |
822 | ec = acpi_driver_data(device); | |
837012ed | 823 | mutex_lock(&ec->lock); |
07ddf768 | 824 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
825 | list_del(&handler->node); |
826 | kfree(handler); | |
827 | } | |
828 | mutex_unlock(&ec->lock); | |
1da177e4 | 829 | acpi_ec_remove_fs(device); |
db89b4f0 | 830 | device->driver_data = NULL; |
d033879c | 831 | if (ec == first_ec) |
c0900c35 | 832 | first_ec = NULL; |
4c611060 | 833 | kfree(ec); |
d550d98d | 834 | return 0; |
1da177e4 LT |
835 | } |
836 | ||
1da177e4 | 837 | static acpi_status |
c0900c35 | 838 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 839 | { |
3d02b90b | 840 | struct acpi_ec *ec = context; |
1da177e4 | 841 | |
01f22462 | 842 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 843 | return AE_OK; |
1da177e4 LT |
844 | |
845 | /* | |
846 | * The first address region returned is the data port, and | |
847 | * the second address region returned is the status/command | |
848 | * port. | |
849 | */ | |
01f22462 | 850 | if (ec->data_addr == 0) |
6ffb221a | 851 | ec->data_addr = resource->data.io.minimum; |
01f22462 | 852 | else if (ec->command_addr == 0) |
6ffb221a | 853 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 854 | else |
1da177e4 | 855 | return AE_CTRL_TERMINATE; |
1da177e4 | 856 | |
1da177e4 LT |
857 | return AE_OK; |
858 | } | |
859 | ||
e8284321 AS |
860 | static int ec_install_handlers(struct acpi_ec *ec) |
861 | { | |
c0900c35 | 862 | acpi_status status; |
7c6db4e0 | 863 | if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) |
4c611060 | 864 | return 0; |
c0900c35 | 865 | status = acpi_install_gpe_handler(NULL, ec->gpe, |
7c6db4e0 AS |
866 | ACPI_GPE_EDGE_TRIGGERED, |
867 | &acpi_ec_gpe_handler, ec); | |
e8284321 AS |
868 | if (ACPI_FAILURE(status)) |
869 | return -ENODEV; | |
870 | acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); | |
871 | acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); | |
e8284321 AS |
872 | status = acpi_install_address_space_handler(ec->handle, |
873 | ACPI_ADR_SPACE_EC, | |
874 | &acpi_ec_space_handler, | |
6d9e1120 | 875 | NULL, ec); |
e8284321 | 876 | if (ACPI_FAILURE(status)) { |
20edd74f ZY |
877 | if (status == AE_NOT_FOUND) { |
878 | /* | |
879 | * Maybe OS fails in evaluating the _REG object. | |
880 | * The AE_NOT_FOUND error will be ignored and OS | |
881 | * continue to initialize EC. | |
882 | */ | |
883 | printk(KERN_ERR "Fail in evaluating the _REG object" | |
884 | " of EC device. Broken bios is suspected.\n"); | |
885 | } else { | |
886 | acpi_remove_gpe_handler(NULL, ec->gpe, | |
887 | &acpi_ec_gpe_handler); | |
888 | return -ENODEV; | |
889 | } | |
e8284321 AS |
890 | } |
891 | ||
7c6db4e0 | 892 | set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
e8284321 AS |
893 | return 0; |
894 | } | |
895 | ||
50526df6 | 896 | static int acpi_ec_start(struct acpi_device *device) |
1da177e4 | 897 | { |
c0900c35 | 898 | struct acpi_ec *ec; |
837012ed | 899 | int ret = 0; |
1da177e4 | 900 | |
1da177e4 | 901 | if (!device) |
d550d98d | 902 | return -EINVAL; |
1da177e4 LT |
903 | |
904 | ec = acpi_driver_data(device); | |
905 | ||
906 | if (!ec) | |
d550d98d | 907 | return -EINVAL; |
1da177e4 | 908 | |
4c611060 | 909 | ret = ec_install_handlers(ec); |
837012ed AS |
910 | |
911 | /* EC is fully operational, allow queries */ | |
080e412c | 912 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
837012ed | 913 | return ret; |
1da177e4 LT |
914 | } |
915 | ||
50526df6 | 916 | static int acpi_ec_stop(struct acpi_device *device, int type) |
1da177e4 | 917 | { |
c0900c35 | 918 | struct acpi_ec *ec; |
1da177e4 | 919 | if (!device) |
d550d98d | 920 | return -EINVAL; |
1da177e4 | 921 | ec = acpi_driver_data(device); |
c0900c35 AS |
922 | if (!ec) |
923 | return -EINVAL; | |
4c611060 | 924 | ec_remove_handlers(ec); |
f9319f90 | 925 | |
d550d98d | 926 | return 0; |
1da177e4 LT |
927 | } |
928 | ||
c04209a7 AS |
929 | int __init acpi_boot_ec_enable(void) |
930 | { | |
7c6db4e0 | 931 | if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags)) |
c04209a7 AS |
932 | return 0; |
933 | if (!ec_install_handlers(boot_ec)) { | |
934 | first_ec = boot_ec; | |
935 | return 0; | |
936 | } | |
937 | return -EFAULT; | |
938 | } | |
939 | ||
223883b7 AS |
940 | static const struct acpi_device_id ec_device_ids[] = { |
941 | {"PNP0C09", 0}, | |
942 | {"", 0}, | |
943 | }; | |
944 | ||
c0900c35 AS |
945 | int __init acpi_ec_ecdt_probe(void) |
946 | { | |
947 | int ret; | |
948 | acpi_status status; | |
50526df6 | 949 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 950 | |
d66d969d AS |
951 | boot_ec = make_acpi_ec(); |
952 | if (!boot_ec) | |
c0900c35 AS |
953 | return -ENOMEM; |
954 | /* | |
955 | * Generate a boot ec context | |
956 | */ | |
15a58ed1 AS |
957 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
958 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 959 | if (ACPI_SUCCESS(status)) { |
3ebe08a7 | 960 | pr_info(PREFIX "EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
961 | boot_ec->command_addr = ecdt_ptr->control.address; |
962 | boot_ec->data_addr = ecdt_ptr->data.address; | |
2500822b ZY |
963 | if (dmi_check_system(ec_dmi_table)) { |
964 | /* | |
965 | * If the board falls into ec_dmi_table, it means | |
966 | * that ECDT table gives the incorrect command/status | |
967 | * & data I/O address. Just fix it. | |
968 | */ | |
969 | boot_ec->data_addr = ecdt_ptr->control.address; | |
970 | boot_ec->command_addr = ecdt_ptr->data.address; | |
971 | } | |
cd8c93a4 | 972 | boot_ec->gpe = ecdt_ptr->gpe; |
4af8e10a | 973 | boot_ec->handle = ACPI_ROOT_OBJECT; |
ce52ddf5 | 974 | acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle); |
cd8c93a4 | 975 | } else { |
5870a8cd AS |
976 | /* This workaround is needed only on some broken machines, |
977 | * which require early EC, but fail to provide ECDT */ | |
978 | acpi_handle x; | |
cd8c93a4 AS |
979 | printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n"); |
980 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, | |
981 | boot_ec, NULL); | |
2d8348b4 AS |
982 | /* Check that acpi_get_devices actually find something */ |
983 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
cd8c93a4 | 984 | goto error; |
5870a8cd AS |
985 | /* We really need to limit this workaround, the only ASUS, |
986 | * which needs it, has fake EC._INI method, so use it as flag. | |
c04209a7 | 987 | * Keep boot_ec struct as it will be needed soon. |
5870a8cd AS |
988 | */ |
989 | if (ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", &x))) | |
c04209a7 | 990 | return -ENODEV; |
cd8c93a4 | 991 | } |
1da177e4 | 992 | |
d66d969d | 993 | ret = ec_install_handlers(boot_ec); |
d033879c AS |
994 | if (!ret) { |
995 | first_ec = boot_ec; | |
e8284321 | 996 | return 0; |
d033879c | 997 | } |
c0900c35 | 998 | error: |
d66d969d AS |
999 | kfree(boot_ec); |
1000 | boot_ec = NULL; | |
1da177e4 LT |
1001 | return -ENODEV; |
1002 | } | |
1003 | ||
223883b7 AS |
1004 | static int acpi_ec_suspend(struct acpi_device *device, pm_message_t state) |
1005 | { | |
1006 | struct acpi_ec *ec = acpi_driver_data(device); | |
1007 | /* Stop using GPE */ | |
1008 | set_bit(EC_FLAGS_NO_GPE, &ec->flags); | |
1009 | clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); | |
1010 | acpi_disable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); | |
1011 | return 0; | |
1012 | } | |
1013 | ||
1014 | static int acpi_ec_resume(struct acpi_device *device) | |
1015 | { | |
1016 | struct acpi_ec *ec = acpi_driver_data(device); | |
1017 | /* Enable use of GPE back */ | |
1018 | clear_bit(EC_FLAGS_NO_GPE, &ec->flags); | |
1019 | acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); | |
1020 | return 0; | |
1021 | } | |
1022 | ||
1023 | static struct acpi_driver acpi_ec_driver = { | |
1024 | .name = "ec", | |
1025 | .class = ACPI_EC_CLASS, | |
1026 | .ids = ec_device_ids, | |
1027 | .ops = { | |
1028 | .add = acpi_ec_add, | |
1029 | .remove = acpi_ec_remove, | |
1030 | .start = acpi_ec_start, | |
1031 | .stop = acpi_ec_stop, | |
1032 | .suspend = acpi_ec_suspend, | |
1033 | .resume = acpi_ec_resume, | |
1034 | }, | |
1035 | }; | |
1036 | ||
50526df6 | 1037 | static int __init acpi_ec_init(void) |
1da177e4 | 1038 | { |
50526df6 | 1039 | int result = 0; |
1da177e4 | 1040 | |
1da177e4 | 1041 | if (acpi_disabled) |
d550d98d | 1042 | return 0; |
1da177e4 LT |
1043 | |
1044 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); | |
1045 | if (!acpi_ec_dir) | |
d550d98d | 1046 | return -ENODEV; |
1da177e4 LT |
1047 | |
1048 | /* Now register the driver for the EC */ | |
1049 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
1050 | if (result < 0) { | |
1051 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
d550d98d | 1052 | return -ENODEV; |
1da177e4 LT |
1053 | } |
1054 | ||
d550d98d | 1055 | return result; |
1da177e4 LT |
1056 | } |
1057 | ||
1058 | subsys_initcall(acpi_ec_init); | |
1059 | ||
1060 | /* EC driver currently not unloadable */ | |
1061 | #if 0 | |
50526df6 | 1062 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1063 | { |
1da177e4 LT |
1064 | |
1065 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1066 | ||
1067 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
1068 | ||
d550d98d | 1069 | return; |
1da177e4 | 1070 | } |
7843932a | 1071 | #endif /* 0 */ |