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); | |
1cfe62c8 | 242 | udelay(ACPI_EC_UDELAY); |
7c6db4e0 AS |
243 | while (time_before(jiffies, delay)) { |
244 | gpe_transaction(ec, acpi_ec_read_status(ec)); | |
1cfe62c8 | 245 | udelay(ACPI_EC_UDELAY); |
7c6db4e0 | 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) { |
f8248434 AJ |
289 | pr_info(PREFIX "GPE storm detected, " |
290 | "transactions will use polling mode\n"); | |
7c6db4e0 AS |
291 | set_bit(EC_FLAGS_GPE_STORM, &ec->flags); |
292 | } | |
293 | return ret; | |
294 | } | |
295 | ||
296 | static int ec_check_ibf0(struct acpi_ec *ec) | |
297 | { | |
298 | u8 status = acpi_ec_read_status(ec); | |
299 | return (status & ACPI_EC_FLAG_IBF) == 0; | |
45bea155 LY |
300 | } |
301 | ||
c0ff1772 AS |
302 | static int ec_wait_ibf0(struct acpi_ec *ec) |
303 | { | |
304 | unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); | |
305 | /* interrupt wait manually if GPE mode is not active */ | |
306 | unsigned long timeout = test_bit(EC_FLAGS_GPE_MODE, &ec->flags) ? | |
307 | msecs_to_jiffies(ACPI_EC_DELAY) : msecs_to_jiffies(1); | |
308 | while (time_before(jiffies, delay)) | |
309 | if (wait_event_timeout(ec->wait, ec_check_ibf0(ec), timeout)) | |
310 | return 0; | |
311 | return -ETIME; | |
45bea155 LY |
312 | } |
313 | ||
8463200a | 314 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t, |
00eb43a1 | 315 | int force_poll) |
1da177e4 | 316 | { |
d7a76e4c | 317 | int status; |
50526df6 | 318 | u32 glk; |
8463200a | 319 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
d550d98d | 320 | return -EINVAL; |
8463200a AS |
321 | if (t->rdata) |
322 | memset(t->rdata, 0, t->rlen); | |
523953b4 | 323 | mutex_lock(&ec->lock); |
703959d4 | 324 | if (ec->global_lock) { |
1da177e4 | 325 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 326 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
327 | status = -ENODEV; |
328 | goto unlock; | |
c24e912b | 329 | } |
1da177e4 | 330 | } |
c0ff1772 | 331 | if (ec_wait_ibf0(ec)) { |
3ebe08a7 MN |
332 | pr_err(PREFIX "input buffer is not empty, " |
333 | "aborting transaction\n"); | |
7c6db4e0 | 334 | status = -ETIME; |
451566f4 | 335 | goto end; |
716e084e | 336 | } |
8463200a | 337 | status = acpi_ec_transaction_unlocked(ec, t, force_poll); |
7c6db4e0 | 338 | end: |
703959d4 | 339 | if (ec->global_lock) |
1da177e4 | 340 | acpi_release_global_lock(glk); |
7c6db4e0 | 341 | unlock: |
523953b4 | 342 | mutex_unlock(&ec->lock); |
d550d98d | 343 | return status; |
1da177e4 LT |
344 | } |
345 | ||
c45aac43 AS |
346 | /* |
347 | * Note: samsung nv5000 doesn't work with ec burst mode. | |
348 | * http://bugzilla.kernel.org/show_bug.cgi?id=4980 | |
349 | */ | |
350 | int acpi_ec_burst_enable(struct acpi_ec *ec) | |
351 | { | |
352 | u8 d; | |
8463200a AS |
353 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
354 | .wdata = NULL, .rdata = &d, | |
355 | .wlen = 0, .rlen = 1}; | |
356 | ||
357 | return acpi_ec_transaction(ec, &t, 0); | |
c45aac43 AS |
358 | } |
359 | ||
360 | int acpi_ec_burst_disable(struct acpi_ec *ec) | |
361 | { | |
8463200a AS |
362 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
363 | .wdata = NULL, .rdata = NULL, | |
364 | .wlen = 0, .rlen = 0}; | |
365 | ||
7c6db4e0 | 366 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
8463200a | 367 | acpi_ec_transaction(ec, &t, 0) : 0; |
c45aac43 AS |
368 | } |
369 | ||
6ccedb10 | 370 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) |
3576cf61 DS |
371 | { |
372 | int result; | |
373 | u8 d; | |
8463200a AS |
374 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
375 | .wdata = &address, .rdata = &d, | |
376 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 377 | |
8463200a | 378 | result = acpi_ec_transaction(ec, &t, 0); |
3576cf61 DS |
379 | *data = d; |
380 | return result; | |
381 | } | |
6ffb221a | 382 | |
3576cf61 DS |
383 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
384 | { | |
6ccedb10 | 385 | u8 wdata[2] = { address, data }; |
8463200a AS |
386 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
387 | .wdata = wdata, .rdata = NULL, | |
388 | .wlen = 2, .rlen = 0}; | |
389 | ||
390 | return acpi_ec_transaction(ec, &t, 0); | |
3576cf61 DS |
391 | } |
392 | ||
1da177e4 LT |
393 | /* |
394 | * Externally callable EC access functions. For now, assume 1 EC only | |
395 | */ | |
c45aac43 AS |
396 | int ec_burst_enable(void) |
397 | { | |
c45aac43 AS |
398 | if (!first_ec) |
399 | return -ENODEV; | |
d033879c | 400 | return acpi_ec_burst_enable(first_ec); |
c45aac43 AS |
401 | } |
402 | ||
403 | EXPORT_SYMBOL(ec_burst_enable); | |
404 | ||
405 | int ec_burst_disable(void) | |
406 | { | |
c45aac43 AS |
407 | if (!first_ec) |
408 | return -ENODEV; | |
d033879c | 409 | return acpi_ec_burst_disable(first_ec); |
c45aac43 AS |
410 | } |
411 | ||
412 | EXPORT_SYMBOL(ec_burst_disable); | |
413 | ||
6ccedb10 | 414 | int ec_read(u8 addr, u8 * val) |
1da177e4 | 415 | { |
1da177e4 | 416 | int err; |
6ffb221a | 417 | u8 temp_data; |
1da177e4 LT |
418 | |
419 | if (!first_ec) | |
420 | return -ENODEV; | |
421 | ||
d033879c | 422 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
423 | |
424 | if (!err) { | |
425 | *val = temp_data; | |
426 | return 0; | |
50526df6 | 427 | } else |
1da177e4 LT |
428 | return err; |
429 | } | |
50526df6 | 430 | |
1da177e4 LT |
431 | EXPORT_SYMBOL(ec_read); |
432 | ||
50526df6 | 433 | int ec_write(u8 addr, u8 val) |
1da177e4 | 434 | { |
1da177e4 LT |
435 | int err; |
436 | ||
437 | if (!first_ec) | |
438 | return -ENODEV; | |
439 | ||
d033879c | 440 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
441 | |
442 | return err; | |
443 | } | |
50526df6 | 444 | |
1da177e4 LT |
445 | EXPORT_SYMBOL(ec_write); |
446 | ||
616362de | 447 | int ec_transaction(u8 command, |
9e197219 | 448 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
449 | u8 * rdata, unsigned rdata_len, |
450 | int force_poll) | |
45bea155 | 451 | { |
8463200a AS |
452 | struct transaction t = {.command = command, |
453 | .wdata = wdata, .rdata = rdata, | |
454 | .wlen = wdata_len, .rlen = rdata_len}; | |
d7a76e4c LP |
455 | if (!first_ec) |
456 | return -ENODEV; | |
45bea155 | 457 | |
8463200a | 458 | return acpi_ec_transaction(first_ec, &t, force_poll); |
45bea155 | 459 | } |
1da177e4 | 460 | |
ab9e43c6 LP |
461 | EXPORT_SYMBOL(ec_transaction); |
462 | ||
6ccedb10 | 463 | static int acpi_ec_query(struct acpi_ec *ec, u8 * data) |
3576cf61 DS |
464 | { |
465 | int result; | |
6ccedb10 | 466 | u8 d; |
8463200a AS |
467 | struct transaction t = {.command = ACPI_EC_COMMAND_QUERY, |
468 | .wdata = NULL, .rdata = &d, | |
469 | .wlen = 0, .rlen = 1}; | |
6ccedb10 AS |
470 | if (!ec || !data) |
471 | return -EINVAL; | |
1da177e4 | 472 | |
6ccedb10 AS |
473 | /* |
474 | * Query the EC to find out which _Qxx method we need to evaluate. | |
475 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
476 | * bit to be cleared (and thus clearing the interrupt source). | |
477 | */ | |
716e084e | 478 | |
8463200a | 479 | result = acpi_ec_transaction(ec, &t, 0); |
6ccedb10 AS |
480 | if (result) |
481 | return result; | |
1da177e4 | 482 | |
6ccedb10 AS |
483 | if (!d) |
484 | return -ENODATA; | |
1da177e4 | 485 | |
6ccedb10 AS |
486 | *data = d; |
487 | return 0; | |
1da177e4 LT |
488 | } |
489 | ||
1da177e4 LT |
490 | /* -------------------------------------------------------------------------- |
491 | Event Management | |
492 | -------------------------------------------------------------------------- */ | |
837012ed AS |
493 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
494 | acpi_handle handle, acpi_ec_query_func func, | |
495 | void *data) | |
496 | { | |
497 | struct acpi_ec_query_handler *handler = | |
498 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
499 | if (!handler) | |
500 | return -ENOMEM; | |
501 | ||
502 | handler->query_bit = query_bit; | |
503 | handler->handle = handle; | |
504 | handler->func = func; | |
505 | handler->data = data; | |
506 | mutex_lock(&ec->lock); | |
30c08574 | 507 | list_add(&handler->node, &ec->list); |
837012ed AS |
508 | mutex_unlock(&ec->lock); |
509 | return 0; | |
510 | } | |
511 | ||
512 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); | |
513 | ||
514 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
515 | { | |
1544fdbc | 516 | struct acpi_ec_query_handler *handler, *tmp; |
837012ed | 517 | mutex_lock(&ec->lock); |
1544fdbc | 518 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
519 | if (query_bit == handler->query_bit) { |
520 | list_del(&handler->node); | |
521 | kfree(handler); | |
837012ed AS |
522 | } |
523 | } | |
524 | mutex_unlock(&ec->lock); | |
525 | } | |
526 | ||
527 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); | |
1da177e4 | 528 | |
50526df6 | 529 | static void acpi_ec_gpe_query(void *ec_cxt) |
45bea155 | 530 | { |
3d02b90b | 531 | struct acpi_ec *ec = ec_cxt; |
6ffb221a | 532 | u8 value = 0; |
837012ed | 533 | struct acpi_ec_query_handler *handler, copy; |
45bea155 | 534 | |
5d0c288b | 535 | if (!ec || acpi_ec_query(ec, &value)) |
e41334c0 | 536 | return; |
837012ed AS |
537 | mutex_lock(&ec->lock); |
538 | list_for_each_entry(handler, &ec->list, node) { | |
539 | if (value == handler->query_bit) { | |
540 | /* have custom handler for this bit */ | |
541 | memcpy(©, handler, sizeof(copy)); | |
542 | mutex_unlock(&ec->lock); | |
543 | if (copy.func) { | |
544 | copy.func(copy.data); | |
545 | } else if (copy.handle) { | |
546 | acpi_evaluate_object(copy.handle, NULL, NULL, NULL); | |
547 | } | |
548 | return; | |
549 | } | |
550 | } | |
551 | mutex_unlock(&ec->lock); | |
45bea155 | 552 | } |
1da177e4 | 553 | |
50526df6 | 554 | static u32 acpi_ec_gpe_handler(void *data) |
1da177e4 | 555 | { |
3d02b90b | 556 | struct acpi_ec *ec = data; |
7c6db4e0 | 557 | u8 status; |
00eb43a1 | 558 | |
3ebe08a7 | 559 | pr_debug(PREFIX "~~~> interrupt\n"); |
7c6db4e0 AS |
560 | status = acpi_ec_read_status(ec); |
561 | ||
562 | gpe_transaction(ec, status); | |
563 | if (ec_transaction_done(ec) && (status & ACPI_EC_FLAG_IBF) == 0) | |
af3fd140 | 564 | wake_up(&ec->wait); |
451566f4 | 565 | |
7c6db4e0 AS |
566 | ec_check_sci(ec, status); |
567 | if (!test_bit(EC_FLAGS_GPE_MODE, &ec->flags) && | |
568 | !test_bit(EC_FLAGS_NO_GPE, &ec->flags)) { | |
95b937e3 | 569 | /* this is non-query, must be confirmation */ |
f8248434 AJ |
570 | if (!test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { |
571 | if (printk_ratelimit()) | |
572 | pr_info(PREFIX "non-query interrupt received," | |
573 | " switching to interrupt mode\n"); | |
574 | } else { | |
575 | /* hush, STORM switches the mode every transaction */ | |
576 | pr_debug(PREFIX "non-query interrupt received," | |
3ebe08a7 | 577 | " switching to interrupt mode\n"); |
f8248434 | 578 | } |
7843932a | 579 | set_bit(EC_FLAGS_GPE_MODE, &ec->flags); |
95b937e3 | 580 | } |
7c6db4e0 | 581 | return ACPI_INTERRUPT_HANDLED; |
845625cd AS |
582 | } |
583 | ||
1da177e4 LT |
584 | /* -------------------------------------------------------------------------- |
585 | Address Space Management | |
586 | -------------------------------------------------------------------------- */ | |
587 | ||
1da177e4 | 588 | static acpi_status |
5b7734b4 AS |
589 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
590 | u32 bits, acpi_integer *value, | |
50526df6 | 591 | void *handler_context, void *region_context) |
1da177e4 | 592 | { |
3d02b90b | 593 | struct acpi_ec *ec = handler_context; |
3e71a87d | 594 | int result = 0, i; |
5b7734b4 | 595 | u8 temp = 0; |
1da177e4 | 596 | |
1da177e4 | 597 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 598 | return AE_BAD_PARAMETER; |
1da177e4 | 599 | |
5b7734b4 | 600 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 601 | return AE_BAD_PARAMETER; |
1da177e4 | 602 | |
5b7734b4 AS |
603 | if (bits != 8 && acpi_strict) |
604 | return AE_BAD_PARAMETER; | |
1da177e4 | 605 | |
b3b233c7 AS |
606 | acpi_ec_burst_enable(ec); |
607 | ||
3e71a87d AS |
608 | if (function == ACPI_READ) { |
609 | result = acpi_ec_read(ec, address, &temp); | |
610 | *value = temp; | |
611 | } else { | |
612 | temp = 0xff & (*value); | |
613 | result = acpi_ec_write(ec, address, temp); | |
614 | } | |
615 | ||
616 | for (i = 8; unlikely(bits - i > 0); i += 8) { | |
617 | ++address; | |
5b7734b4 AS |
618 | if (function == ACPI_READ) { |
619 | result = acpi_ec_read(ec, address, &temp); | |
620 | (*value) |= ((acpi_integer)temp) << i; | |
621 | } else { | |
622 | temp = 0xff & ((*value) >> i); | |
623 | result = acpi_ec_write(ec, address, temp); | |
624 | } | |
1da177e4 LT |
625 | } |
626 | ||
b3b233c7 AS |
627 | acpi_ec_burst_disable(ec); |
628 | ||
1da177e4 LT |
629 | switch (result) { |
630 | case -EINVAL: | |
d550d98d | 631 | return AE_BAD_PARAMETER; |
1da177e4 LT |
632 | break; |
633 | case -ENODEV: | |
d550d98d | 634 | return AE_NOT_FOUND; |
1da177e4 LT |
635 | break; |
636 | case -ETIME: | |
d550d98d | 637 | return AE_TIME; |
1da177e4 LT |
638 | break; |
639 | default: | |
d550d98d | 640 | return AE_OK; |
1da177e4 | 641 | } |
1da177e4 LT |
642 | } |
643 | ||
1da177e4 LT |
644 | /* -------------------------------------------------------------------------- |
645 | FS Interface (/proc) | |
646 | -------------------------------------------------------------------------- */ | |
647 | ||
50526df6 | 648 | static struct proc_dir_entry *acpi_ec_dir; |
1da177e4 | 649 | |
50526df6 | 650 | static int acpi_ec_read_info(struct seq_file *seq, void *offset) |
1da177e4 | 651 | { |
3d02b90b | 652 | struct acpi_ec *ec = seq->private; |
1da177e4 | 653 | |
1da177e4 LT |
654 | if (!ec) |
655 | goto end; | |
656 | ||
01f22462 AS |
657 | seq_printf(seq, "gpe:\t\t\t0x%02x\n", (u32) ec->gpe); |
658 | seq_printf(seq, "ports:\t\t\t0x%02x, 0x%02x\n", | |
659 | (unsigned)ec->command_addr, (unsigned)ec->data_addr); | |
660 | seq_printf(seq, "use global lock:\t%s\n", | |
703959d4 | 661 | ec->global_lock ? "yes" : "no"); |
50526df6 | 662 | end: |
d550d98d | 663 | return 0; |
1da177e4 LT |
664 | } |
665 | ||
666 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) | |
667 | { | |
668 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); | |
669 | } | |
670 | ||
703959d4 | 671 | static struct file_operations acpi_ec_info_ops = { |
50526df6 LB |
672 | .open = acpi_ec_info_open_fs, |
673 | .read = seq_read, | |
674 | .llseek = seq_lseek, | |
675 | .release = single_release, | |
1da177e4 LT |
676 | .owner = THIS_MODULE, |
677 | }; | |
678 | ||
50526df6 | 679 | static int acpi_ec_add_fs(struct acpi_device *device) |
1da177e4 | 680 | { |
50526df6 | 681 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 682 | |
1da177e4 LT |
683 | if (!acpi_device_dir(device)) { |
684 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
50526df6 | 685 | acpi_ec_dir); |
1da177e4 | 686 | if (!acpi_device_dir(device)) |
d550d98d | 687 | return -ENODEV; |
1da177e4 LT |
688 | } |
689 | ||
cf7acfab DL |
690 | entry = proc_create_data(ACPI_EC_FILE_INFO, S_IRUGO, |
691 | acpi_device_dir(device), | |
692 | &acpi_ec_info_ops, acpi_driver_data(device)); | |
1da177e4 | 693 | if (!entry) |
d550d98d | 694 | return -ENODEV; |
d550d98d | 695 | return 0; |
1da177e4 LT |
696 | } |
697 | ||
50526df6 | 698 | static int acpi_ec_remove_fs(struct acpi_device *device) |
1da177e4 | 699 | { |
1da177e4 LT |
700 | |
701 | if (acpi_device_dir(device)) { | |
702 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); | |
703 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); | |
704 | acpi_device_dir(device) = NULL; | |
705 | } | |
706 | ||
d550d98d | 707 | return 0; |
1da177e4 LT |
708 | } |
709 | ||
1da177e4 LT |
710 | /* -------------------------------------------------------------------------- |
711 | Driver Interface | |
712 | -------------------------------------------------------------------------- */ | |
c0900c35 AS |
713 | static acpi_status |
714 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
715 | ||
c0900c35 AS |
716 | static struct acpi_ec *make_acpi_ec(void) |
717 | { | |
718 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
719 | if (!ec) | |
720 | return NULL; | |
080e412c | 721 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
c0900c35 AS |
722 | mutex_init(&ec->lock); |
723 | init_waitqueue_head(&ec->wait); | |
837012ed | 724 | INIT_LIST_HEAD(&ec->list); |
8463200a | 725 | spin_lock_init(&ec->curr_lock); |
c0900c35 AS |
726 | return ec; |
727 | } | |
837012ed | 728 | |
c019b193 AS |
729 | static acpi_status |
730 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
731 | void *context, void **return_value) | |
732 | { | |
733 | struct acpi_namespace_node *node = handle; | |
734 | struct acpi_ec *ec = context; | |
735 | int value = 0; | |
736 | if (sscanf(node->name.ascii, "_Q%x", &value) == 1) { | |
737 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); | |
738 | } | |
739 | return AE_OK; | |
740 | } | |
741 | ||
cd8c93a4 AS |
742 | static acpi_status |
743 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 744 | { |
cd8c93a4 | 745 | acpi_status status; |
27663c58 | 746 | unsigned long long tmp; |
cd8c93a4 AS |
747 | |
748 | struct acpi_ec *ec = context; | |
749 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, | |
750 | ec_parse_io_ports, ec); | |
751 | if (ACPI_FAILURE(status)) | |
752 | return status; | |
837012ed AS |
753 | |
754 | /* Get GPE bit assignment (EC events). */ | |
755 | /* TODO: Add support for _GPE returning a package */ | |
27663c58 | 756 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
cd8c93a4 AS |
757 | if (ACPI_FAILURE(status)) |
758 | return status; | |
27663c58 | 759 | ec->gpe = tmp; |
837012ed | 760 | /* Use the global lock for all EC transactions? */ |
27663c58 MW |
761 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
762 | ec->global_lock = tmp; | |
837012ed | 763 | ec->handle = handle; |
cd8c93a4 | 764 | return AE_CTRL_TERMINATE; |
837012ed AS |
765 | } |
766 | ||
4c611060 AS |
767 | static void ec_remove_handlers(struct acpi_ec *ec) |
768 | { | |
769 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, | |
770 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
3ebe08a7 | 771 | pr_err(PREFIX "failed to remove space handler\n"); |
4c611060 AS |
772 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
773 | &acpi_ec_gpe_handler))) | |
3ebe08a7 | 774 | pr_err(PREFIX "failed to remove gpe handler\n"); |
7c6db4e0 | 775 | clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
4c611060 AS |
776 | } |
777 | ||
703959d4 | 778 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 779 | { |
703959d4 | 780 | struct acpi_ec *ec = NULL; |
45bea155 | 781 | |
45bea155 | 782 | if (!device) |
d550d98d | 783 | return -EINVAL; |
c0900c35 AS |
784 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
785 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
786 | ||
4c611060 | 787 | /* Check for boot EC */ |
ce52ddf5 AS |
788 | if (boot_ec && |
789 | (boot_ec->handle == device->handle || | |
790 | boot_ec->handle == ACPI_ROOT_OBJECT)) { | |
791 | ec = boot_ec; | |
792 | boot_ec = NULL; | |
793 | } else { | |
794 | ec = make_acpi_ec(); | |
795 | if (!ec) | |
796 | return -ENOMEM; | |
797 | if (ec_parse_device(device->handle, 0, ec, NULL) != | |
798 | AE_CTRL_TERMINATE) { | |
799 | kfree(ec); | |
800 | return -EINVAL; | |
4c611060 AS |
801 | } |
802 | } | |
803 | ||
c0900c35 | 804 | ec->handle = device->handle; |
ce52ddf5 AS |
805 | |
806 | /* Find and register all query methods */ | |
807 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
808 | acpi_ec_register_query_methods, ec, NULL); | |
809 | ||
4c611060 AS |
810 | if (!first_ec) |
811 | first_ec = ec; | |
db89b4f0 | 812 | device->driver_data = ec; |
c0900c35 | 813 | acpi_ec_add_fs(device); |
3ebe08a7 | 814 | pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 815 | ec->gpe, ec->command_addr, ec->data_addr); |
3ebe08a7 | 816 | pr_info(PREFIX "driver started in %s mode\n", |
95b937e3 | 817 | (test_bit(EC_FLAGS_GPE_MODE, &ec->flags))?"interrupt":"poll"); |
c0900c35 | 818 | return 0; |
1da177e4 LT |
819 | } |
820 | ||
50526df6 | 821 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 822 | { |
01f22462 | 823 | struct acpi_ec *ec; |
07ddf768 | 824 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 825 | |
1da177e4 | 826 | if (!device) |
d550d98d | 827 | return -EINVAL; |
1da177e4 LT |
828 | |
829 | ec = acpi_driver_data(device); | |
837012ed | 830 | mutex_lock(&ec->lock); |
07ddf768 | 831 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
832 | list_del(&handler->node); |
833 | kfree(handler); | |
834 | } | |
835 | mutex_unlock(&ec->lock); | |
1da177e4 | 836 | acpi_ec_remove_fs(device); |
db89b4f0 | 837 | device->driver_data = NULL; |
d033879c | 838 | if (ec == first_ec) |
c0900c35 | 839 | first_ec = NULL; |
4c611060 | 840 | kfree(ec); |
d550d98d | 841 | return 0; |
1da177e4 LT |
842 | } |
843 | ||
1da177e4 | 844 | static acpi_status |
c0900c35 | 845 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 846 | { |
3d02b90b | 847 | struct acpi_ec *ec = context; |
1da177e4 | 848 | |
01f22462 | 849 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 850 | return AE_OK; |
1da177e4 LT |
851 | |
852 | /* | |
853 | * The first address region returned is the data port, and | |
854 | * the second address region returned is the status/command | |
855 | * port. | |
856 | */ | |
01f22462 | 857 | if (ec->data_addr == 0) |
6ffb221a | 858 | ec->data_addr = resource->data.io.minimum; |
01f22462 | 859 | else if (ec->command_addr == 0) |
6ffb221a | 860 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 861 | else |
1da177e4 | 862 | return AE_CTRL_TERMINATE; |
1da177e4 | 863 | |
1da177e4 LT |
864 | return AE_OK; |
865 | } | |
866 | ||
e8284321 AS |
867 | static int ec_install_handlers(struct acpi_ec *ec) |
868 | { | |
c0900c35 | 869 | acpi_status status; |
7c6db4e0 | 870 | if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) |
4c611060 | 871 | return 0; |
c0900c35 | 872 | status = acpi_install_gpe_handler(NULL, ec->gpe, |
7c6db4e0 AS |
873 | ACPI_GPE_EDGE_TRIGGERED, |
874 | &acpi_ec_gpe_handler, ec); | |
e8284321 AS |
875 | if (ACPI_FAILURE(status)) |
876 | return -ENODEV; | |
877 | acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); | |
878 | acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); | |
e8284321 AS |
879 | status = acpi_install_address_space_handler(ec->handle, |
880 | ACPI_ADR_SPACE_EC, | |
881 | &acpi_ec_space_handler, | |
6d9e1120 | 882 | NULL, ec); |
e8284321 | 883 | if (ACPI_FAILURE(status)) { |
20edd74f ZY |
884 | if (status == AE_NOT_FOUND) { |
885 | /* | |
886 | * Maybe OS fails in evaluating the _REG object. | |
887 | * The AE_NOT_FOUND error will be ignored and OS | |
888 | * continue to initialize EC. | |
889 | */ | |
890 | printk(KERN_ERR "Fail in evaluating the _REG object" | |
891 | " of EC device. Broken bios is suspected.\n"); | |
892 | } else { | |
893 | acpi_remove_gpe_handler(NULL, ec->gpe, | |
894 | &acpi_ec_gpe_handler); | |
895 | return -ENODEV; | |
896 | } | |
e8284321 AS |
897 | } |
898 | ||
7c6db4e0 | 899 | set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
e8284321 AS |
900 | return 0; |
901 | } | |
902 | ||
50526df6 | 903 | static int acpi_ec_start(struct acpi_device *device) |
1da177e4 | 904 | { |
c0900c35 | 905 | struct acpi_ec *ec; |
837012ed | 906 | int ret = 0; |
1da177e4 | 907 | |
1da177e4 | 908 | if (!device) |
d550d98d | 909 | return -EINVAL; |
1da177e4 LT |
910 | |
911 | ec = acpi_driver_data(device); | |
912 | ||
913 | if (!ec) | |
d550d98d | 914 | return -EINVAL; |
1da177e4 | 915 | |
4c611060 | 916 | ret = ec_install_handlers(ec); |
837012ed AS |
917 | |
918 | /* EC is fully operational, allow queries */ | |
080e412c | 919 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
837012ed | 920 | return ret; |
1da177e4 LT |
921 | } |
922 | ||
50526df6 | 923 | static int acpi_ec_stop(struct acpi_device *device, int type) |
1da177e4 | 924 | { |
c0900c35 | 925 | struct acpi_ec *ec; |
1da177e4 | 926 | if (!device) |
d550d98d | 927 | return -EINVAL; |
1da177e4 | 928 | ec = acpi_driver_data(device); |
c0900c35 AS |
929 | if (!ec) |
930 | return -EINVAL; | |
4c611060 | 931 | ec_remove_handlers(ec); |
f9319f90 | 932 | |
d550d98d | 933 | return 0; |
1da177e4 LT |
934 | } |
935 | ||
c04209a7 AS |
936 | int __init acpi_boot_ec_enable(void) |
937 | { | |
7c6db4e0 | 938 | if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags)) |
c04209a7 AS |
939 | return 0; |
940 | if (!ec_install_handlers(boot_ec)) { | |
941 | first_ec = boot_ec; | |
942 | return 0; | |
943 | } | |
944 | return -EFAULT; | |
945 | } | |
946 | ||
223883b7 AS |
947 | static const struct acpi_device_id ec_device_ids[] = { |
948 | {"PNP0C09", 0}, | |
949 | {"", 0}, | |
950 | }; | |
951 | ||
c0900c35 AS |
952 | int __init acpi_ec_ecdt_probe(void) |
953 | { | |
954 | int ret; | |
955 | acpi_status status; | |
50526df6 | 956 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 957 | |
d66d969d AS |
958 | boot_ec = make_acpi_ec(); |
959 | if (!boot_ec) | |
c0900c35 AS |
960 | return -ENOMEM; |
961 | /* | |
962 | * Generate a boot ec context | |
963 | */ | |
15a58ed1 AS |
964 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
965 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 966 | if (ACPI_SUCCESS(status)) { |
3ebe08a7 | 967 | pr_info(PREFIX "EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
968 | boot_ec->command_addr = ecdt_ptr->control.address; |
969 | boot_ec->data_addr = ecdt_ptr->data.address; | |
2500822b ZY |
970 | if (dmi_check_system(ec_dmi_table)) { |
971 | /* | |
972 | * If the board falls into ec_dmi_table, it means | |
973 | * that ECDT table gives the incorrect command/status | |
974 | * & data I/O address. Just fix it. | |
975 | */ | |
976 | boot_ec->data_addr = ecdt_ptr->control.address; | |
977 | boot_ec->command_addr = ecdt_ptr->data.address; | |
978 | } | |
cd8c93a4 | 979 | boot_ec->gpe = ecdt_ptr->gpe; |
4af8e10a | 980 | boot_ec->handle = ACPI_ROOT_OBJECT; |
ce52ddf5 | 981 | acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle); |
cd8c93a4 | 982 | } else { |
5870a8cd AS |
983 | /* This workaround is needed only on some broken machines, |
984 | * which require early EC, but fail to provide ECDT */ | |
985 | acpi_handle x; | |
cd8c93a4 AS |
986 | printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n"); |
987 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, | |
988 | boot_ec, NULL); | |
2d8348b4 AS |
989 | /* Check that acpi_get_devices actually find something */ |
990 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
cd8c93a4 | 991 | goto error; |
5870a8cd AS |
992 | /* We really need to limit this workaround, the only ASUS, |
993 | * which needs it, has fake EC._INI method, so use it as flag. | |
c04209a7 | 994 | * Keep boot_ec struct as it will be needed soon. |
5870a8cd AS |
995 | */ |
996 | if (ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", &x))) | |
c04209a7 | 997 | return -ENODEV; |
cd8c93a4 | 998 | } |
1da177e4 | 999 | |
d66d969d | 1000 | ret = ec_install_handlers(boot_ec); |
d033879c AS |
1001 | if (!ret) { |
1002 | first_ec = boot_ec; | |
e8284321 | 1003 | return 0; |
d033879c | 1004 | } |
c0900c35 | 1005 | error: |
d66d969d AS |
1006 | kfree(boot_ec); |
1007 | boot_ec = NULL; | |
1da177e4 LT |
1008 | return -ENODEV; |
1009 | } | |
1010 | ||
223883b7 AS |
1011 | static int acpi_ec_suspend(struct acpi_device *device, pm_message_t state) |
1012 | { | |
1013 | struct acpi_ec *ec = acpi_driver_data(device); | |
1014 | /* Stop using GPE */ | |
1015 | set_bit(EC_FLAGS_NO_GPE, &ec->flags); | |
1016 | clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); | |
1017 | acpi_disable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); | |
1018 | return 0; | |
1019 | } | |
1020 | ||
1021 | static int acpi_ec_resume(struct acpi_device *device) | |
1022 | { | |
1023 | struct acpi_ec *ec = acpi_driver_data(device); | |
1024 | /* Enable use of GPE back */ | |
1025 | clear_bit(EC_FLAGS_NO_GPE, &ec->flags); | |
1026 | acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); | |
1027 | return 0; | |
1028 | } | |
1029 | ||
1030 | static struct acpi_driver acpi_ec_driver = { | |
1031 | .name = "ec", | |
1032 | .class = ACPI_EC_CLASS, | |
1033 | .ids = ec_device_ids, | |
1034 | .ops = { | |
1035 | .add = acpi_ec_add, | |
1036 | .remove = acpi_ec_remove, | |
1037 | .start = acpi_ec_start, | |
1038 | .stop = acpi_ec_stop, | |
1039 | .suspend = acpi_ec_suspend, | |
1040 | .resume = acpi_ec_resume, | |
1041 | }, | |
1042 | }; | |
1043 | ||
50526df6 | 1044 | static int __init acpi_ec_init(void) |
1da177e4 | 1045 | { |
50526df6 | 1046 | int result = 0; |
1da177e4 | 1047 | |
1da177e4 | 1048 | if (acpi_disabled) |
d550d98d | 1049 | return 0; |
1da177e4 LT |
1050 | |
1051 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); | |
1052 | if (!acpi_ec_dir) | |
d550d98d | 1053 | return -ENODEV; |
1da177e4 LT |
1054 | |
1055 | /* Now register the driver for the EC */ | |
1056 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
1057 | if (result < 0) { | |
1058 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
d550d98d | 1059 | return -ENODEV; |
1da177e4 LT |
1060 | } |
1061 | ||
d550d98d | 1062 | return result; |
1da177e4 LT |
1063 | } |
1064 | ||
1065 | subsys_initcall(acpi_ec_init); | |
1066 | ||
1067 | /* EC driver currently not unloadable */ | |
1068 | #if 0 | |
50526df6 | 1069 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1070 | { |
1da177e4 LT |
1071 | |
1072 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1073 | ||
1074 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
1075 | ||
d550d98d | 1076 | return; |
1da177e4 | 1077 | } |
7843932a | 1078 | #endif /* 0 */ |