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; | |
dd15f8c4 | 105 | bool done; |
7c6db4e0 AS |
106 | }; |
107 | ||
a854e08a | 108 | static struct acpi_ec { |
703959d4 | 109 | acpi_handle handle; |
a86e2772 | 110 | unsigned long gpe; |
6ffb221a DS |
111 | unsigned long command_addr; |
112 | unsigned long data_addr; | |
703959d4 | 113 | unsigned long global_lock; |
080e412c | 114 | unsigned long flags; |
c787a855 | 115 | struct mutex lock; |
703959d4 | 116 | wait_queue_head_t wait; |
837012ed | 117 | struct list_head list; |
8463200a AS |
118 | struct transaction *curr; |
119 | spinlock_t curr_lock; | |
d033879c | 120 | } *boot_ec, *first_ec; |
703959d4 | 121 | |
2500822b ZY |
122 | /* |
123 | * Some Asus system have exchanged ECDT data/command IO addresses. | |
124 | */ | |
125 | static int print_ecdt_error(const struct dmi_system_id *id) | |
126 | { | |
127 | printk(KERN_NOTICE PREFIX "%s detected - " | |
128 | "ECDT has exchanged control/data I/O address\n", | |
129 | id->ident); | |
130 | return 0; | |
131 | } | |
132 | ||
133 | static struct dmi_system_id __cpuinitdata ec_dmi_table[] = { | |
134 | { | |
135 | print_ecdt_error, "Asus L4R", { | |
136 | DMI_MATCH(DMI_BIOS_VERSION, "1008.006"), | |
137 | DMI_MATCH(DMI_PRODUCT_NAME, "L4R"), | |
138 | DMI_MATCH(DMI_BOARD_NAME, "L4R") }, NULL}, | |
139 | { | |
140 | print_ecdt_error, "Asus M6R", { | |
141 | DMI_MATCH(DMI_BIOS_VERSION, "0207"), | |
142 | DMI_MATCH(DMI_PRODUCT_NAME, "M6R"), | |
143 | DMI_MATCH(DMI_BOARD_NAME, "M6R") }, NULL}, | |
144 | {}, | |
145 | }; | |
146 | ||
1da177e4 LT |
147 | /* -------------------------------------------------------------------------- |
148 | Transaction Management | |
149 | -------------------------------------------------------------------------- */ | |
150 | ||
6ffb221a | 151 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 152 | { |
3ebe08a7 | 153 | u8 x = inb(ec->command_addr); |
86dae015 | 154 | pr_debug(PREFIX "---> status = 0x%2.2x\n", x); |
3ebe08a7 | 155 | return x; |
451566f4 DT |
156 | } |
157 | ||
6ffb221a | 158 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 159 | { |
3ebe08a7 | 160 | u8 x = inb(ec->data_addr); |
86dae015 | 161 | pr_debug(PREFIX "---> data = 0x%2.2x\n", x); |
7c6db4e0 | 162 | return x; |
7c6db5e5 DS |
163 | } |
164 | ||
6ffb221a | 165 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 166 | { |
86dae015 | 167 | pr_debug(PREFIX "<--- command = 0x%2.2x\n", command); |
6ffb221a | 168 | outb(command, ec->command_addr); |
45bea155 LY |
169 | } |
170 | ||
6ffb221a | 171 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 172 | { |
86dae015 | 173 | pr_debug(PREFIX "<--- data = 0x%2.2x\n", data); |
6ffb221a | 174 | outb(data, ec->data_addr); |
703959d4 | 175 | } |
45bea155 | 176 | |
7c6db4e0 | 177 | static int ec_transaction_done(struct acpi_ec *ec) |
6ffb221a | 178 | { |
7c6db4e0 AS |
179 | unsigned long flags; |
180 | int ret = 0; | |
8463200a | 181 | spin_lock_irqsave(&ec->curr_lock, flags); |
dd15f8c4 | 182 | if (!ec->curr || ec->curr->done) |
7c6db4e0 | 183 | ret = 1; |
8463200a | 184 | spin_unlock_irqrestore(&ec->curr_lock, flags); |
7c6db4e0 | 185 | return ret; |
45bea155 | 186 | } |
451566f4 | 187 | |
7c6db4e0 | 188 | static void gpe_transaction(struct acpi_ec *ec, u8 status) |
7c6db5e5 | 189 | { |
7c6db4e0 | 190 | unsigned long flags; |
8463200a AS |
191 | spin_lock_irqsave(&ec->curr_lock, flags); |
192 | if (!ec->curr) | |
7c6db4e0 | 193 | goto unlock; |
8463200a | 194 | if (ec->curr->wlen > 0) { |
7c6db4e0 | 195 | if ((status & ACPI_EC_FLAG_IBF) == 0) { |
8463200a AS |
196 | acpi_ec_write_data(ec, *(ec->curr->wdata++)); |
197 | --ec->curr->wlen; | |
7c6db4e0 | 198 | } else |
dd15f8c4 | 199 | goto err; |
8463200a | 200 | } else if (ec->curr->rlen > 0) { |
7c6db4e0 | 201 | if ((status & ACPI_EC_FLAG_OBF) == 1) { |
8463200a | 202 | *(ec->curr->rdata++) = acpi_ec_read_data(ec); |
dd15f8c4 AS |
203 | if (--ec->curr->rlen == 0) |
204 | ec->curr->done = true; | |
7c6db4e0 | 205 | } else |
dd15f8c4 AS |
206 | goto err; |
207 | } else if (ec->curr->wlen == 0 && (status & ACPI_EC_FLAG_IBF) == 0) | |
208 | ec->curr->done = true; | |
209 | goto unlock; | |
210 | err: | |
211 | /* false interrupt, state didn't change */ | |
212 | ++ec->curr->irq_count; | |
7c6db4e0 | 213 | unlock: |
8463200a | 214 | spin_unlock_irqrestore(&ec->curr_lock, flags); |
845625cd | 215 | } |
03d1d99c | 216 | |
7c6db4e0 | 217 | static int acpi_ec_wait(struct acpi_ec *ec) |
845625cd | 218 | { |
7c6db4e0 AS |
219 | if (wait_event_timeout(ec->wait, ec_transaction_done(ec), |
220 | msecs_to_jiffies(ACPI_EC_DELAY))) | |
221 | return 0; | |
222 | /* missing GPEs, switch back to poll mode */ | |
223 | if (printk_ratelimit()) | |
224 | pr_info(PREFIX "missing confirmations, " | |
225 | "switch off interrupt mode.\n"); | |
b77d81b2 | 226 | set_bit(EC_FLAGS_NO_GPE, &ec->flags); |
845625cd | 227 | clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); |
7c6db4e0 | 228 | return 1; |
845625cd AS |
229 | } |
230 | ||
7c6db4e0 AS |
231 | static void acpi_ec_gpe_query(void *ec_cxt); |
232 | ||
233 | static int ec_check_sci(struct acpi_ec *ec, u8 state) | |
7c6db5e5 | 234 | { |
7c6db4e0 AS |
235 | if (state & ACPI_EC_FLAG_SCI) { |
236 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) | |
237 | return acpi_os_execute(OSL_EC_BURST_HANDLER, | |
238 | acpi_ec_gpe_query, ec); | |
239 | } | |
240 | return 0; | |
241 | } | |
242 | ||
243 | static int ec_poll(struct acpi_ec *ec) | |
244 | { | |
245 | unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); | |
1cfe62c8 | 246 | udelay(ACPI_EC_UDELAY); |
7c6db4e0 AS |
247 | while (time_before(jiffies, delay)) { |
248 | gpe_transaction(ec, acpi_ec_read_status(ec)); | |
1cfe62c8 | 249 | udelay(ACPI_EC_UDELAY); |
7c6db4e0 | 250 | if (ec_transaction_done(ec)) |
9d699ed9 | 251 | return 0; |
af3fd140 | 252 | } |
b77d81b2 | 253 | return -ETIME; |
1da177e4 LT |
254 | } |
255 | ||
8463200a AS |
256 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
257 | struct transaction *t, | |
00eb43a1 | 258 | int force_poll) |
45bea155 | 259 | { |
7c6db4e0 | 260 | unsigned long tmp; |
7c6db4e0 | 261 | int ret = 0; |
3ebe08a7 | 262 | pr_debug(PREFIX "transaction start\n"); |
7c6db4e0 AS |
263 | /* disable GPE during transaction if storm is detected */ |
264 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
265 | clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); | |
266 | acpi_disable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); | |
3576cf61 | 267 | } |
7c6db4e0 | 268 | /* start transaction */ |
8463200a | 269 | spin_lock_irqsave(&ec->curr_lock, tmp); |
7c6db4e0 | 270 | /* following two actions should be kept atomic */ |
8463200a | 271 | t->irq_count = 0; |
dd15f8c4 | 272 | t->done = false; |
8463200a AS |
273 | ec->curr = t; |
274 | acpi_ec_write_cmd(ec, ec->curr->command); | |
275 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) | |
080e412c | 276 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
8463200a | 277 | spin_unlock_irqrestore(&ec->curr_lock, tmp); |
7c6db4e0 AS |
278 | /* if we selected poll mode or failed in GPE-mode do a poll loop */ |
279 | if (force_poll || | |
280 | !test_bit(EC_FLAGS_GPE_MODE, &ec->flags) || | |
281 | acpi_ec_wait(ec)) | |
282 | ret = ec_poll(ec); | |
3ebe08a7 | 283 | pr_debug(PREFIX "transaction end\n"); |
8463200a AS |
284 | spin_lock_irqsave(&ec->curr_lock, tmp); |
285 | ec->curr = NULL; | |
286 | spin_unlock_irqrestore(&ec->curr_lock, tmp); | |
7c6db4e0 AS |
287 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { |
288 | /* check if we received SCI during transaction */ | |
289 | ec_check_sci(ec, acpi_ec_read_status(ec)); | |
290 | /* it is safe to enable GPE outside of transaction */ | |
291 | acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); | |
292 | } else if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags) && | |
8463200a | 293 | t->irq_count > ACPI_EC_STORM_THRESHOLD) { |
f8248434 AJ |
294 | pr_info(PREFIX "GPE storm detected, " |
295 | "transactions will use polling mode\n"); | |
7c6db4e0 AS |
296 | set_bit(EC_FLAGS_GPE_STORM, &ec->flags); |
297 | } | |
298 | return ret; | |
299 | } | |
300 | ||
301 | static int ec_check_ibf0(struct acpi_ec *ec) | |
302 | { | |
303 | u8 status = acpi_ec_read_status(ec); | |
304 | return (status & ACPI_EC_FLAG_IBF) == 0; | |
45bea155 LY |
305 | } |
306 | ||
c0ff1772 AS |
307 | static int ec_wait_ibf0(struct acpi_ec *ec) |
308 | { | |
309 | unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); | |
310 | /* interrupt wait manually if GPE mode is not active */ | |
311 | unsigned long timeout = test_bit(EC_FLAGS_GPE_MODE, &ec->flags) ? | |
312 | msecs_to_jiffies(ACPI_EC_DELAY) : msecs_to_jiffies(1); | |
313 | while (time_before(jiffies, delay)) | |
314 | if (wait_event_timeout(ec->wait, ec_check_ibf0(ec), timeout)) | |
315 | return 0; | |
316 | return -ETIME; | |
45bea155 LY |
317 | } |
318 | ||
8463200a | 319 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t, |
00eb43a1 | 320 | int force_poll) |
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); | |
523953b4 | 328 | mutex_lock(&ec->lock); |
703959d4 | 329 | if (ec->global_lock) { |
1da177e4 | 330 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 331 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
332 | status = -ENODEV; |
333 | goto unlock; | |
c24e912b | 334 | } |
1da177e4 | 335 | } |
c0ff1772 | 336 | if (ec_wait_ibf0(ec)) { |
3ebe08a7 MN |
337 | pr_err(PREFIX "input buffer is not empty, " |
338 | "aborting transaction\n"); | |
7c6db4e0 | 339 | status = -ETIME; |
451566f4 | 340 | goto end; |
716e084e | 341 | } |
8463200a | 342 | status = acpi_ec_transaction_unlocked(ec, t, force_poll); |
7c6db4e0 | 343 | end: |
703959d4 | 344 | if (ec->global_lock) |
1da177e4 | 345 | acpi_release_global_lock(glk); |
7c6db4e0 | 346 | unlock: |
523953b4 | 347 | mutex_unlock(&ec->lock); |
d550d98d | 348 | return status; |
1da177e4 LT |
349 | } |
350 | ||
c45aac43 AS |
351 | /* |
352 | * Note: samsung nv5000 doesn't work with ec burst mode. | |
353 | * http://bugzilla.kernel.org/show_bug.cgi?id=4980 | |
354 | */ | |
355 | int acpi_ec_burst_enable(struct acpi_ec *ec) | |
356 | { | |
357 | u8 d; | |
8463200a AS |
358 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
359 | .wdata = NULL, .rdata = &d, | |
360 | .wlen = 0, .rlen = 1}; | |
361 | ||
362 | return acpi_ec_transaction(ec, &t, 0); | |
c45aac43 AS |
363 | } |
364 | ||
365 | int acpi_ec_burst_disable(struct acpi_ec *ec) | |
366 | { | |
8463200a AS |
367 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
368 | .wdata = NULL, .rdata = NULL, | |
369 | .wlen = 0, .rlen = 0}; | |
370 | ||
7c6db4e0 | 371 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
8463200a | 372 | acpi_ec_transaction(ec, &t, 0) : 0; |
c45aac43 AS |
373 | } |
374 | ||
6ccedb10 | 375 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) |
3576cf61 DS |
376 | { |
377 | int result; | |
378 | u8 d; | |
8463200a AS |
379 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
380 | .wdata = &address, .rdata = &d, | |
381 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 382 | |
8463200a | 383 | result = acpi_ec_transaction(ec, &t, 0); |
3576cf61 DS |
384 | *data = d; |
385 | return result; | |
386 | } | |
6ffb221a | 387 | |
3576cf61 DS |
388 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
389 | { | |
6ccedb10 | 390 | u8 wdata[2] = { address, data }; |
8463200a AS |
391 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
392 | .wdata = wdata, .rdata = NULL, | |
393 | .wlen = 2, .rlen = 0}; | |
394 | ||
395 | return acpi_ec_transaction(ec, &t, 0); | |
3576cf61 DS |
396 | } |
397 | ||
1da177e4 LT |
398 | /* |
399 | * Externally callable EC access functions. For now, assume 1 EC only | |
400 | */ | |
c45aac43 AS |
401 | int ec_burst_enable(void) |
402 | { | |
c45aac43 AS |
403 | if (!first_ec) |
404 | return -ENODEV; | |
d033879c | 405 | return acpi_ec_burst_enable(first_ec); |
c45aac43 AS |
406 | } |
407 | ||
408 | EXPORT_SYMBOL(ec_burst_enable); | |
409 | ||
410 | int ec_burst_disable(void) | |
411 | { | |
c45aac43 AS |
412 | if (!first_ec) |
413 | return -ENODEV; | |
d033879c | 414 | return acpi_ec_burst_disable(first_ec); |
c45aac43 AS |
415 | } |
416 | ||
417 | EXPORT_SYMBOL(ec_burst_disable); | |
418 | ||
6ccedb10 | 419 | int ec_read(u8 addr, u8 * val) |
1da177e4 | 420 | { |
1da177e4 | 421 | int err; |
6ffb221a | 422 | u8 temp_data; |
1da177e4 LT |
423 | |
424 | if (!first_ec) | |
425 | return -ENODEV; | |
426 | ||
d033879c | 427 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
428 | |
429 | if (!err) { | |
430 | *val = temp_data; | |
431 | return 0; | |
50526df6 | 432 | } else |
1da177e4 LT |
433 | return err; |
434 | } | |
50526df6 | 435 | |
1da177e4 LT |
436 | EXPORT_SYMBOL(ec_read); |
437 | ||
50526df6 | 438 | int ec_write(u8 addr, u8 val) |
1da177e4 | 439 | { |
1da177e4 LT |
440 | int err; |
441 | ||
442 | if (!first_ec) | |
443 | return -ENODEV; | |
444 | ||
d033879c | 445 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
446 | |
447 | return err; | |
448 | } | |
50526df6 | 449 | |
1da177e4 LT |
450 | EXPORT_SYMBOL(ec_write); |
451 | ||
616362de | 452 | int ec_transaction(u8 command, |
9e197219 | 453 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
454 | u8 * rdata, unsigned rdata_len, |
455 | int force_poll) | |
45bea155 | 456 | { |
8463200a AS |
457 | struct transaction t = {.command = command, |
458 | .wdata = wdata, .rdata = rdata, | |
459 | .wlen = wdata_len, .rlen = rdata_len}; | |
d7a76e4c LP |
460 | if (!first_ec) |
461 | return -ENODEV; | |
45bea155 | 462 | |
8463200a | 463 | return acpi_ec_transaction(first_ec, &t, force_poll); |
45bea155 | 464 | } |
1da177e4 | 465 | |
ab9e43c6 LP |
466 | EXPORT_SYMBOL(ec_transaction); |
467 | ||
6ccedb10 | 468 | static int acpi_ec_query(struct acpi_ec *ec, u8 * data) |
3576cf61 DS |
469 | { |
470 | int result; | |
6ccedb10 | 471 | u8 d; |
8463200a AS |
472 | struct transaction t = {.command = ACPI_EC_COMMAND_QUERY, |
473 | .wdata = NULL, .rdata = &d, | |
474 | .wlen = 0, .rlen = 1}; | |
6ccedb10 AS |
475 | if (!ec || !data) |
476 | return -EINVAL; | |
1da177e4 | 477 | |
6ccedb10 AS |
478 | /* |
479 | * Query the EC to find out which _Qxx method we need to evaluate. | |
480 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
481 | * bit to be cleared (and thus clearing the interrupt source). | |
482 | */ | |
716e084e | 483 | |
8463200a | 484 | result = acpi_ec_transaction(ec, &t, 0); |
6ccedb10 AS |
485 | if (result) |
486 | return result; | |
1da177e4 | 487 | |
6ccedb10 AS |
488 | if (!d) |
489 | return -ENODATA; | |
1da177e4 | 490 | |
6ccedb10 AS |
491 | *data = d; |
492 | return 0; | |
1da177e4 LT |
493 | } |
494 | ||
1da177e4 LT |
495 | /* -------------------------------------------------------------------------- |
496 | Event Management | |
497 | -------------------------------------------------------------------------- */ | |
837012ed AS |
498 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
499 | acpi_handle handle, acpi_ec_query_func func, | |
500 | void *data) | |
501 | { | |
502 | struct acpi_ec_query_handler *handler = | |
503 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
504 | if (!handler) | |
505 | return -ENOMEM; | |
506 | ||
507 | handler->query_bit = query_bit; | |
508 | handler->handle = handle; | |
509 | handler->func = func; | |
510 | handler->data = data; | |
511 | mutex_lock(&ec->lock); | |
30c08574 | 512 | list_add(&handler->node, &ec->list); |
837012ed AS |
513 | mutex_unlock(&ec->lock); |
514 | return 0; | |
515 | } | |
516 | ||
517 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); | |
518 | ||
519 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
520 | { | |
1544fdbc | 521 | struct acpi_ec_query_handler *handler, *tmp; |
837012ed | 522 | mutex_lock(&ec->lock); |
1544fdbc | 523 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
524 | if (query_bit == handler->query_bit) { |
525 | list_del(&handler->node); | |
526 | kfree(handler); | |
837012ed AS |
527 | } |
528 | } | |
529 | mutex_unlock(&ec->lock); | |
530 | } | |
531 | ||
532 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); | |
1da177e4 | 533 | |
50526df6 | 534 | static void acpi_ec_gpe_query(void *ec_cxt) |
45bea155 | 535 | { |
3d02b90b | 536 | struct acpi_ec *ec = ec_cxt; |
6ffb221a | 537 | u8 value = 0; |
837012ed | 538 | struct acpi_ec_query_handler *handler, copy; |
45bea155 | 539 | |
5d0c288b | 540 | if (!ec || acpi_ec_query(ec, &value)) |
e41334c0 | 541 | return; |
837012ed AS |
542 | mutex_lock(&ec->lock); |
543 | list_for_each_entry(handler, &ec->list, node) { | |
544 | if (value == handler->query_bit) { | |
545 | /* have custom handler for this bit */ | |
546 | memcpy(©, handler, sizeof(copy)); | |
547 | mutex_unlock(&ec->lock); | |
548 | if (copy.func) { | |
549 | copy.func(copy.data); | |
550 | } else if (copy.handle) { | |
551 | acpi_evaluate_object(copy.handle, NULL, NULL, NULL); | |
552 | } | |
553 | return; | |
554 | } | |
555 | } | |
556 | mutex_unlock(&ec->lock); | |
45bea155 | 557 | } |
1da177e4 | 558 | |
50526df6 | 559 | static u32 acpi_ec_gpe_handler(void *data) |
1da177e4 | 560 | { |
3d02b90b | 561 | struct acpi_ec *ec = data; |
7c6db4e0 | 562 | u8 status; |
00eb43a1 | 563 | |
3ebe08a7 | 564 | pr_debug(PREFIX "~~~> interrupt\n"); |
7c6db4e0 AS |
565 | status = acpi_ec_read_status(ec); |
566 | ||
567 | gpe_transaction(ec, status); | |
568 | if (ec_transaction_done(ec) && (status & ACPI_EC_FLAG_IBF) == 0) | |
af3fd140 | 569 | wake_up(&ec->wait); |
451566f4 | 570 | |
7c6db4e0 AS |
571 | ec_check_sci(ec, status); |
572 | if (!test_bit(EC_FLAGS_GPE_MODE, &ec->flags) && | |
573 | !test_bit(EC_FLAGS_NO_GPE, &ec->flags)) { | |
95b937e3 | 574 | /* this is non-query, must be confirmation */ |
f8248434 AJ |
575 | if (!test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { |
576 | if (printk_ratelimit()) | |
577 | pr_info(PREFIX "non-query interrupt received," | |
578 | " switching to interrupt mode\n"); | |
579 | } else { | |
580 | /* hush, STORM switches the mode every transaction */ | |
581 | pr_debug(PREFIX "non-query interrupt received," | |
3ebe08a7 | 582 | " switching to interrupt mode\n"); |
f8248434 | 583 | } |
7843932a | 584 | set_bit(EC_FLAGS_GPE_MODE, &ec->flags); |
95b937e3 | 585 | } |
7c6db4e0 | 586 | return ACPI_INTERRUPT_HANDLED; |
845625cd AS |
587 | } |
588 | ||
1da177e4 LT |
589 | /* -------------------------------------------------------------------------- |
590 | Address Space Management | |
591 | -------------------------------------------------------------------------- */ | |
592 | ||
1da177e4 | 593 | static acpi_status |
5b7734b4 AS |
594 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
595 | u32 bits, acpi_integer *value, | |
50526df6 | 596 | void *handler_context, void *region_context) |
1da177e4 | 597 | { |
3d02b90b | 598 | struct acpi_ec *ec = handler_context; |
3e71a87d | 599 | int result = 0, i; |
5b7734b4 | 600 | u8 temp = 0; |
1da177e4 | 601 | |
1da177e4 | 602 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 603 | return AE_BAD_PARAMETER; |
1da177e4 | 604 | |
5b7734b4 | 605 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 606 | return AE_BAD_PARAMETER; |
1da177e4 | 607 | |
5b7734b4 AS |
608 | if (bits != 8 && acpi_strict) |
609 | return AE_BAD_PARAMETER; | |
1da177e4 | 610 | |
b3b233c7 AS |
611 | acpi_ec_burst_enable(ec); |
612 | ||
3e71a87d AS |
613 | if (function == ACPI_READ) { |
614 | result = acpi_ec_read(ec, address, &temp); | |
615 | *value = temp; | |
616 | } else { | |
617 | temp = 0xff & (*value); | |
618 | result = acpi_ec_write(ec, address, temp); | |
619 | } | |
620 | ||
621 | for (i = 8; unlikely(bits - i > 0); i += 8) { | |
622 | ++address; | |
5b7734b4 AS |
623 | if (function == ACPI_READ) { |
624 | result = acpi_ec_read(ec, address, &temp); | |
625 | (*value) |= ((acpi_integer)temp) << i; | |
626 | } else { | |
627 | temp = 0xff & ((*value) >> i); | |
628 | result = acpi_ec_write(ec, address, temp); | |
629 | } | |
1da177e4 LT |
630 | } |
631 | ||
b3b233c7 AS |
632 | acpi_ec_burst_disable(ec); |
633 | ||
1da177e4 LT |
634 | switch (result) { |
635 | case -EINVAL: | |
d550d98d | 636 | return AE_BAD_PARAMETER; |
1da177e4 LT |
637 | break; |
638 | case -ENODEV: | |
d550d98d | 639 | return AE_NOT_FOUND; |
1da177e4 LT |
640 | break; |
641 | case -ETIME: | |
d550d98d | 642 | return AE_TIME; |
1da177e4 LT |
643 | break; |
644 | default: | |
d550d98d | 645 | return AE_OK; |
1da177e4 | 646 | } |
1da177e4 LT |
647 | } |
648 | ||
1da177e4 LT |
649 | /* -------------------------------------------------------------------------- |
650 | FS Interface (/proc) | |
651 | -------------------------------------------------------------------------- */ | |
652 | ||
50526df6 | 653 | static struct proc_dir_entry *acpi_ec_dir; |
1da177e4 | 654 | |
50526df6 | 655 | static int acpi_ec_read_info(struct seq_file *seq, void *offset) |
1da177e4 | 656 | { |
3d02b90b | 657 | struct acpi_ec *ec = seq->private; |
1da177e4 | 658 | |
1da177e4 LT |
659 | if (!ec) |
660 | goto end; | |
661 | ||
01f22462 AS |
662 | seq_printf(seq, "gpe:\t\t\t0x%02x\n", (u32) ec->gpe); |
663 | seq_printf(seq, "ports:\t\t\t0x%02x, 0x%02x\n", | |
664 | (unsigned)ec->command_addr, (unsigned)ec->data_addr); | |
665 | seq_printf(seq, "use global lock:\t%s\n", | |
703959d4 | 666 | ec->global_lock ? "yes" : "no"); |
50526df6 | 667 | end: |
d550d98d | 668 | return 0; |
1da177e4 LT |
669 | } |
670 | ||
671 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) | |
672 | { | |
673 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); | |
674 | } | |
675 | ||
703959d4 | 676 | static struct file_operations acpi_ec_info_ops = { |
50526df6 LB |
677 | .open = acpi_ec_info_open_fs, |
678 | .read = seq_read, | |
679 | .llseek = seq_lseek, | |
680 | .release = single_release, | |
1da177e4 LT |
681 | .owner = THIS_MODULE, |
682 | }; | |
683 | ||
50526df6 | 684 | static int acpi_ec_add_fs(struct acpi_device *device) |
1da177e4 | 685 | { |
50526df6 | 686 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 687 | |
1da177e4 LT |
688 | if (!acpi_device_dir(device)) { |
689 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
50526df6 | 690 | acpi_ec_dir); |
1da177e4 | 691 | if (!acpi_device_dir(device)) |
d550d98d | 692 | return -ENODEV; |
1da177e4 LT |
693 | } |
694 | ||
cf7acfab DL |
695 | entry = proc_create_data(ACPI_EC_FILE_INFO, S_IRUGO, |
696 | acpi_device_dir(device), | |
697 | &acpi_ec_info_ops, acpi_driver_data(device)); | |
1da177e4 | 698 | if (!entry) |
d550d98d | 699 | return -ENODEV; |
d550d98d | 700 | return 0; |
1da177e4 LT |
701 | } |
702 | ||
50526df6 | 703 | static int acpi_ec_remove_fs(struct acpi_device *device) |
1da177e4 | 704 | { |
1da177e4 LT |
705 | |
706 | if (acpi_device_dir(device)) { | |
707 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); | |
708 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); | |
709 | acpi_device_dir(device) = NULL; | |
710 | } | |
711 | ||
d550d98d | 712 | return 0; |
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; |
c0900c35 AS |
727 | mutex_init(&ec->lock); |
728 | init_waitqueue_head(&ec->wait); | |
837012ed | 729 | INIT_LIST_HEAD(&ec->list); |
8463200a | 730 | spin_lock_init(&ec->curr_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 | { | |
738 | struct acpi_namespace_node *node = handle; | |
739 | struct acpi_ec *ec = context; | |
740 | int value = 0; | |
741 | if (sscanf(node->name.ascii, "_Q%x", &value) == 1) { | |
742 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); | |
743 | } | |
744 | return AE_OK; | |
745 | } | |
746 | ||
cd8c93a4 AS |
747 | static acpi_status |
748 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 749 | { |
cd8c93a4 | 750 | acpi_status status; |
27663c58 | 751 | unsigned long long tmp; |
cd8c93a4 AS |
752 | |
753 | struct acpi_ec *ec = context; | |
754 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, | |
755 | ec_parse_io_ports, ec); | |
756 | if (ACPI_FAILURE(status)) | |
757 | return status; | |
837012ed AS |
758 | |
759 | /* Get GPE bit assignment (EC events). */ | |
760 | /* TODO: Add support for _GPE returning a package */ | |
27663c58 | 761 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
cd8c93a4 AS |
762 | if (ACPI_FAILURE(status)) |
763 | return status; | |
27663c58 | 764 | ec->gpe = tmp; |
837012ed | 765 | /* Use the global lock for all EC transactions? */ |
27663c58 MW |
766 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
767 | ec->global_lock = tmp; | |
837012ed | 768 | ec->handle = handle; |
cd8c93a4 | 769 | return AE_CTRL_TERMINATE; |
837012ed AS |
770 | } |
771 | ||
4c611060 AS |
772 | static void ec_remove_handlers(struct acpi_ec *ec) |
773 | { | |
774 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, | |
775 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
3ebe08a7 | 776 | pr_err(PREFIX "failed to remove space handler\n"); |
4c611060 AS |
777 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
778 | &acpi_ec_gpe_handler))) | |
3ebe08a7 | 779 | pr_err(PREFIX "failed to remove gpe handler\n"); |
7c6db4e0 | 780 | clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
4c611060 AS |
781 | } |
782 | ||
703959d4 | 783 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 784 | { |
703959d4 | 785 | struct acpi_ec *ec = NULL; |
45bea155 | 786 | |
45bea155 | 787 | if (!device) |
d550d98d | 788 | return -EINVAL; |
c0900c35 AS |
789 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
790 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
791 | ||
4c611060 | 792 | /* Check for boot EC */ |
ce52ddf5 AS |
793 | if (boot_ec && |
794 | (boot_ec->handle == device->handle || | |
795 | boot_ec->handle == ACPI_ROOT_OBJECT)) { | |
796 | ec = boot_ec; | |
797 | boot_ec = NULL; | |
798 | } else { | |
799 | ec = make_acpi_ec(); | |
800 | if (!ec) | |
801 | return -ENOMEM; | |
802 | if (ec_parse_device(device->handle, 0, ec, NULL) != | |
803 | AE_CTRL_TERMINATE) { | |
804 | kfree(ec); | |
805 | return -EINVAL; | |
4c611060 AS |
806 | } |
807 | } | |
808 | ||
c0900c35 | 809 | ec->handle = device->handle; |
ce52ddf5 AS |
810 | |
811 | /* Find and register all query methods */ | |
812 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
813 | acpi_ec_register_query_methods, ec, NULL); | |
814 | ||
4c611060 AS |
815 | if (!first_ec) |
816 | first_ec = ec; | |
db89b4f0 | 817 | device->driver_data = ec; |
c0900c35 | 818 | acpi_ec_add_fs(device); |
3ebe08a7 | 819 | pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 820 | ec->gpe, ec->command_addr, ec->data_addr); |
3ebe08a7 | 821 | pr_info(PREFIX "driver started in %s mode\n", |
95b937e3 | 822 | (test_bit(EC_FLAGS_GPE_MODE, &ec->flags))?"interrupt":"poll"); |
c0900c35 | 823 | return 0; |
1da177e4 LT |
824 | } |
825 | ||
50526df6 | 826 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 827 | { |
01f22462 | 828 | struct acpi_ec *ec; |
07ddf768 | 829 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 830 | |
1da177e4 | 831 | if (!device) |
d550d98d | 832 | return -EINVAL; |
1da177e4 LT |
833 | |
834 | ec = acpi_driver_data(device); | |
837012ed | 835 | mutex_lock(&ec->lock); |
07ddf768 | 836 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
837 | list_del(&handler->node); |
838 | kfree(handler); | |
839 | } | |
840 | mutex_unlock(&ec->lock); | |
1da177e4 | 841 | acpi_ec_remove_fs(device); |
db89b4f0 | 842 | device->driver_data = NULL; |
d033879c | 843 | if (ec == first_ec) |
c0900c35 | 844 | first_ec = NULL; |
4c611060 | 845 | kfree(ec); |
d550d98d | 846 | return 0; |
1da177e4 LT |
847 | } |
848 | ||
1da177e4 | 849 | static acpi_status |
c0900c35 | 850 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 851 | { |
3d02b90b | 852 | struct acpi_ec *ec = context; |
1da177e4 | 853 | |
01f22462 | 854 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 855 | return AE_OK; |
1da177e4 LT |
856 | |
857 | /* | |
858 | * The first address region returned is the data port, and | |
859 | * the second address region returned is the status/command | |
860 | * port. | |
861 | */ | |
01f22462 | 862 | if (ec->data_addr == 0) |
6ffb221a | 863 | ec->data_addr = resource->data.io.minimum; |
01f22462 | 864 | else if (ec->command_addr == 0) |
6ffb221a | 865 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 866 | else |
1da177e4 | 867 | return AE_CTRL_TERMINATE; |
1da177e4 | 868 | |
1da177e4 LT |
869 | return AE_OK; |
870 | } | |
871 | ||
e8284321 AS |
872 | static int ec_install_handlers(struct acpi_ec *ec) |
873 | { | |
c0900c35 | 874 | acpi_status status; |
7c6db4e0 | 875 | if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) |
4c611060 | 876 | return 0; |
c0900c35 | 877 | status = acpi_install_gpe_handler(NULL, ec->gpe, |
7c6db4e0 AS |
878 | ACPI_GPE_EDGE_TRIGGERED, |
879 | &acpi_ec_gpe_handler, ec); | |
e8284321 AS |
880 | if (ACPI_FAILURE(status)) |
881 | return -ENODEV; | |
882 | acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); | |
883 | acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); | |
e8284321 AS |
884 | status = acpi_install_address_space_handler(ec->handle, |
885 | ACPI_ADR_SPACE_EC, | |
886 | &acpi_ec_space_handler, | |
6d9e1120 | 887 | NULL, ec); |
e8284321 | 888 | if (ACPI_FAILURE(status)) { |
20edd74f ZY |
889 | if (status == AE_NOT_FOUND) { |
890 | /* | |
891 | * Maybe OS fails in evaluating the _REG object. | |
892 | * The AE_NOT_FOUND error will be ignored and OS | |
893 | * continue to initialize EC. | |
894 | */ | |
895 | printk(KERN_ERR "Fail in evaluating the _REG object" | |
896 | " of EC device. Broken bios is suspected.\n"); | |
897 | } else { | |
898 | acpi_remove_gpe_handler(NULL, ec->gpe, | |
899 | &acpi_ec_gpe_handler); | |
900 | return -ENODEV; | |
901 | } | |
e8284321 AS |
902 | } |
903 | ||
7c6db4e0 | 904 | set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
e8284321 AS |
905 | return 0; |
906 | } | |
907 | ||
50526df6 | 908 | static int acpi_ec_start(struct acpi_device *device) |
1da177e4 | 909 | { |
c0900c35 | 910 | struct acpi_ec *ec; |
837012ed | 911 | int ret = 0; |
1da177e4 | 912 | |
1da177e4 | 913 | if (!device) |
d550d98d | 914 | return -EINVAL; |
1da177e4 LT |
915 | |
916 | ec = acpi_driver_data(device); | |
917 | ||
918 | if (!ec) | |
d550d98d | 919 | return -EINVAL; |
1da177e4 | 920 | |
4c611060 | 921 | ret = ec_install_handlers(ec); |
837012ed AS |
922 | |
923 | /* EC is fully operational, allow queries */ | |
080e412c | 924 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
837012ed | 925 | return ret; |
1da177e4 LT |
926 | } |
927 | ||
50526df6 | 928 | static int acpi_ec_stop(struct acpi_device *device, int type) |
1da177e4 | 929 | { |
c0900c35 | 930 | struct acpi_ec *ec; |
1da177e4 | 931 | if (!device) |
d550d98d | 932 | return -EINVAL; |
1da177e4 | 933 | ec = acpi_driver_data(device); |
c0900c35 AS |
934 | if (!ec) |
935 | return -EINVAL; | |
4c611060 | 936 | ec_remove_handlers(ec); |
f9319f90 | 937 | |
d550d98d | 938 | return 0; |
1da177e4 LT |
939 | } |
940 | ||
c04209a7 AS |
941 | int __init acpi_boot_ec_enable(void) |
942 | { | |
7c6db4e0 | 943 | if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags)) |
c04209a7 AS |
944 | return 0; |
945 | if (!ec_install_handlers(boot_ec)) { | |
946 | first_ec = boot_ec; | |
947 | return 0; | |
948 | } | |
949 | return -EFAULT; | |
950 | } | |
951 | ||
223883b7 AS |
952 | static const struct acpi_device_id ec_device_ids[] = { |
953 | {"PNP0C09", 0}, | |
954 | {"", 0}, | |
955 | }; | |
956 | ||
c0900c35 AS |
957 | int __init acpi_ec_ecdt_probe(void) |
958 | { | |
959 | int ret; | |
960 | acpi_status status; | |
50526df6 | 961 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 962 | |
d66d969d AS |
963 | boot_ec = make_acpi_ec(); |
964 | if (!boot_ec) | |
c0900c35 AS |
965 | return -ENOMEM; |
966 | /* | |
967 | * Generate a boot ec context | |
968 | */ | |
15a58ed1 AS |
969 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
970 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 971 | if (ACPI_SUCCESS(status)) { |
3ebe08a7 | 972 | pr_info(PREFIX "EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
973 | boot_ec->command_addr = ecdt_ptr->control.address; |
974 | boot_ec->data_addr = ecdt_ptr->data.address; | |
2500822b ZY |
975 | if (dmi_check_system(ec_dmi_table)) { |
976 | /* | |
977 | * If the board falls into ec_dmi_table, it means | |
978 | * that ECDT table gives the incorrect command/status | |
979 | * & data I/O address. Just fix it. | |
980 | */ | |
981 | boot_ec->data_addr = ecdt_ptr->control.address; | |
982 | boot_ec->command_addr = ecdt_ptr->data.address; | |
983 | } | |
cd8c93a4 | 984 | boot_ec->gpe = ecdt_ptr->gpe; |
4af8e10a | 985 | boot_ec->handle = ACPI_ROOT_OBJECT; |
ce52ddf5 | 986 | acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle); |
cd8c93a4 | 987 | } else { |
5870a8cd AS |
988 | /* This workaround is needed only on some broken machines, |
989 | * which require early EC, but fail to provide ECDT */ | |
990 | acpi_handle x; | |
cd8c93a4 AS |
991 | printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n"); |
992 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, | |
993 | boot_ec, NULL); | |
2d8348b4 AS |
994 | /* Check that acpi_get_devices actually find something */ |
995 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
cd8c93a4 | 996 | goto error; |
5870a8cd AS |
997 | /* We really need to limit this workaround, the only ASUS, |
998 | * which needs it, has fake EC._INI method, so use it as flag. | |
c04209a7 | 999 | * Keep boot_ec struct as it will be needed soon. |
5870a8cd AS |
1000 | */ |
1001 | if (ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", &x))) | |
c04209a7 | 1002 | return -ENODEV; |
cd8c93a4 | 1003 | } |
1da177e4 | 1004 | |
d66d969d | 1005 | ret = ec_install_handlers(boot_ec); |
d033879c AS |
1006 | if (!ret) { |
1007 | first_ec = boot_ec; | |
e8284321 | 1008 | return 0; |
d033879c | 1009 | } |
c0900c35 | 1010 | error: |
d66d969d AS |
1011 | kfree(boot_ec); |
1012 | boot_ec = NULL; | |
1da177e4 LT |
1013 | return -ENODEV; |
1014 | } | |
1015 | ||
223883b7 AS |
1016 | static int acpi_ec_suspend(struct acpi_device *device, pm_message_t state) |
1017 | { | |
1018 | struct acpi_ec *ec = acpi_driver_data(device); | |
1019 | /* Stop using GPE */ | |
1020 | set_bit(EC_FLAGS_NO_GPE, &ec->flags); | |
1021 | clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); | |
1022 | acpi_disable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); | |
1023 | return 0; | |
1024 | } | |
1025 | ||
1026 | static int acpi_ec_resume(struct acpi_device *device) | |
1027 | { | |
1028 | struct acpi_ec *ec = acpi_driver_data(device); | |
1029 | /* Enable use of GPE back */ | |
1030 | clear_bit(EC_FLAGS_NO_GPE, &ec->flags); | |
1031 | acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); | |
1032 | return 0; | |
1033 | } | |
1034 | ||
1035 | static struct acpi_driver acpi_ec_driver = { | |
1036 | .name = "ec", | |
1037 | .class = ACPI_EC_CLASS, | |
1038 | .ids = ec_device_ids, | |
1039 | .ops = { | |
1040 | .add = acpi_ec_add, | |
1041 | .remove = acpi_ec_remove, | |
1042 | .start = acpi_ec_start, | |
1043 | .stop = acpi_ec_stop, | |
1044 | .suspend = acpi_ec_suspend, | |
1045 | .resume = acpi_ec_resume, | |
1046 | }, | |
1047 | }; | |
1048 | ||
50526df6 | 1049 | static int __init acpi_ec_init(void) |
1da177e4 | 1050 | { |
50526df6 | 1051 | int result = 0; |
1da177e4 | 1052 | |
1da177e4 | 1053 | if (acpi_disabled) |
d550d98d | 1054 | return 0; |
1da177e4 LT |
1055 | |
1056 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); | |
1057 | if (!acpi_ec_dir) | |
d550d98d | 1058 | return -ENODEV; |
1da177e4 LT |
1059 | |
1060 | /* Now register the driver for the EC */ | |
1061 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
1062 | if (result < 0) { | |
1063 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
d550d98d | 1064 | return -ENODEV; |
1da177e4 LT |
1065 | } |
1066 | ||
d550d98d | 1067 | return result; |
1da177e4 LT |
1068 | } |
1069 | ||
1070 | subsys_initcall(acpi_ec_init); | |
1071 | ||
1072 | /* EC driver currently not unloadable */ | |
1073 | #if 0 | |
50526df6 | 1074 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1075 | { |
1da177e4 LT |
1076 | |
1077 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1078 | ||
1079 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
1080 | ||
d550d98d | 1081 | return; |
1da177e4 | 1082 | } |
7843932a | 1083 | #endif /* 0 */ |