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Commit | Line | Data |
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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 | |
06cf7d3c | 73 | #define ACPI_EC_STORM_THRESHOLD 8 /* number of false interrupts |
7c6db4e0 AS |
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; |
a2f93aea AS |
103 | u8 wi; |
104 | u8 ri; | |
7c6db4e0 AS |
105 | u8 wlen; |
106 | u8 rlen; | |
dd15f8c4 | 107 | bool done; |
7c6db4e0 AS |
108 | }; |
109 | ||
a854e08a | 110 | static struct acpi_ec { |
703959d4 | 111 | acpi_handle handle; |
a86e2772 | 112 | unsigned long gpe; |
6ffb221a DS |
113 | unsigned long command_addr; |
114 | unsigned long data_addr; | |
703959d4 | 115 | unsigned long global_lock; |
080e412c | 116 | unsigned long flags; |
c787a855 | 117 | struct mutex lock; |
703959d4 | 118 | wait_queue_head_t wait; |
837012ed | 119 | struct list_head list; |
8463200a AS |
120 | struct transaction *curr; |
121 | spinlock_t curr_lock; | |
d033879c | 122 | } *boot_ec, *first_ec; |
703959d4 | 123 | |
2500822b ZY |
124 | /* |
125 | * Some Asus system have exchanged ECDT data/command IO addresses. | |
126 | */ | |
127 | static int print_ecdt_error(const struct dmi_system_id *id) | |
128 | { | |
129 | printk(KERN_NOTICE PREFIX "%s detected - " | |
130 | "ECDT has exchanged control/data I/O address\n", | |
131 | id->ident); | |
132 | return 0; | |
133 | } | |
134 | ||
135 | static struct dmi_system_id __cpuinitdata ec_dmi_table[] = { | |
136 | { | |
137 | print_ecdt_error, "Asus L4R", { | |
138 | DMI_MATCH(DMI_BIOS_VERSION, "1008.006"), | |
139 | DMI_MATCH(DMI_PRODUCT_NAME, "L4R"), | |
140 | DMI_MATCH(DMI_BOARD_NAME, "L4R") }, NULL}, | |
141 | { | |
142 | print_ecdt_error, "Asus M6R", { | |
143 | DMI_MATCH(DMI_BIOS_VERSION, "0207"), | |
144 | DMI_MATCH(DMI_PRODUCT_NAME, "M6R"), | |
145 | DMI_MATCH(DMI_BOARD_NAME, "M6R") }, NULL}, | |
146 | {}, | |
147 | }; | |
148 | ||
1da177e4 LT |
149 | /* -------------------------------------------------------------------------- |
150 | Transaction Management | |
151 | -------------------------------------------------------------------------- */ | |
152 | ||
6ffb221a | 153 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 154 | { |
3ebe08a7 | 155 | u8 x = inb(ec->command_addr); |
86dae015 | 156 | pr_debug(PREFIX "---> status = 0x%2.2x\n", x); |
3ebe08a7 | 157 | return x; |
451566f4 DT |
158 | } |
159 | ||
6ffb221a | 160 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 161 | { |
3ebe08a7 | 162 | u8 x = inb(ec->data_addr); |
86dae015 | 163 | pr_debug(PREFIX "---> data = 0x%2.2x\n", x); |
7c6db4e0 | 164 | return x; |
7c6db5e5 DS |
165 | } |
166 | ||
6ffb221a | 167 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 168 | { |
86dae015 | 169 | pr_debug(PREFIX "<--- command = 0x%2.2x\n", command); |
6ffb221a | 170 | outb(command, ec->command_addr); |
45bea155 LY |
171 | } |
172 | ||
6ffb221a | 173 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 174 | { |
86dae015 | 175 | pr_debug(PREFIX "<--- data = 0x%2.2x\n", data); |
6ffb221a | 176 | outb(data, ec->data_addr); |
703959d4 | 177 | } |
45bea155 | 178 | |
7c6db4e0 | 179 | static int ec_transaction_done(struct acpi_ec *ec) |
6ffb221a | 180 | { |
7c6db4e0 AS |
181 | unsigned long flags; |
182 | int ret = 0; | |
8463200a | 183 | spin_lock_irqsave(&ec->curr_lock, flags); |
dd15f8c4 | 184 | if (!ec->curr || ec->curr->done) |
7c6db4e0 | 185 | ret = 1; |
8463200a | 186 | spin_unlock_irqrestore(&ec->curr_lock, flags); |
7c6db4e0 | 187 | return ret; |
45bea155 | 188 | } |
451566f4 | 189 | |
a2f93aea AS |
190 | static void start_transaction(struct acpi_ec *ec) |
191 | { | |
192 | ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0; | |
193 | ec->curr->done = false; | |
194 | acpi_ec_write_cmd(ec, ec->curr->command); | |
195 | } | |
196 | ||
7c6db4e0 | 197 | static void gpe_transaction(struct acpi_ec *ec, u8 status) |
7c6db5e5 | 198 | { |
7c6db4e0 | 199 | unsigned long flags; |
8463200a AS |
200 | spin_lock_irqsave(&ec->curr_lock, flags); |
201 | if (!ec->curr) | |
7c6db4e0 | 202 | goto unlock; |
a2f93aea AS |
203 | if (ec->curr->wlen > ec->curr->wi) { |
204 | if ((status & ACPI_EC_FLAG_IBF) == 0) | |
205 | acpi_ec_write_data(ec, | |
206 | ec->curr->wdata[ec->curr->wi++]); | |
207 | else | |
dd15f8c4 | 208 | goto err; |
a2f93aea | 209 | } else if (ec->curr->rlen > ec->curr->ri) { |
7c6db4e0 | 210 | if ((status & ACPI_EC_FLAG_OBF) == 1) { |
a2f93aea AS |
211 | ec->curr->rdata[ec->curr->ri++] = acpi_ec_read_data(ec); |
212 | if (ec->curr->rlen == ec->curr->ri) | |
dd15f8c4 | 213 | ec->curr->done = true; |
7c6db4e0 | 214 | } else |
dd15f8c4 | 215 | goto err; |
a2f93aea AS |
216 | } else if (ec->curr->wlen == ec->curr->wi && |
217 | (status & ACPI_EC_FLAG_IBF) == 0) | |
dd15f8c4 AS |
218 | ec->curr->done = true; |
219 | goto unlock; | |
220 | err: | |
221 | /* false interrupt, state didn't change */ | |
7b4d4692 AS |
222 | if (in_interrupt()) |
223 | ++ec->curr->irq_count; | |
7c6db4e0 | 224 | unlock: |
8463200a | 225 | spin_unlock_irqrestore(&ec->curr_lock, flags); |
845625cd | 226 | } |
03d1d99c | 227 | |
7c6db4e0 | 228 | static int acpi_ec_wait(struct acpi_ec *ec) |
845625cd | 229 | { |
7c6db4e0 AS |
230 | if (wait_event_timeout(ec->wait, ec_transaction_done(ec), |
231 | msecs_to_jiffies(ACPI_EC_DELAY))) | |
232 | return 0; | |
a2f93aea AS |
233 | /* try restart command if we get any false interrupts */ |
234 | if (ec->curr->irq_count && | |
235 | (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) == 0) { | |
236 | pr_debug(PREFIX "controller reset, restart transaction\n"); | |
237 | start_transaction(ec); | |
238 | if (wait_event_timeout(ec->wait, ec_transaction_done(ec), | |
239 | msecs_to_jiffies(ACPI_EC_DELAY))) | |
240 | return 0; | |
241 | } | |
7c6db4e0 AS |
242 | /* missing GPEs, switch back to poll mode */ |
243 | if (printk_ratelimit()) | |
244 | pr_info(PREFIX "missing confirmations, " | |
245 | "switch off interrupt mode.\n"); | |
b77d81b2 | 246 | set_bit(EC_FLAGS_NO_GPE, &ec->flags); |
845625cd | 247 | clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); |
7c6db4e0 | 248 | return 1; |
845625cd AS |
249 | } |
250 | ||
7c6db4e0 AS |
251 | static void acpi_ec_gpe_query(void *ec_cxt); |
252 | ||
253 | static int ec_check_sci(struct acpi_ec *ec, u8 state) | |
7c6db5e5 | 254 | { |
7c6db4e0 AS |
255 | if (state & ACPI_EC_FLAG_SCI) { |
256 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) | |
257 | return acpi_os_execute(OSL_EC_BURST_HANDLER, | |
258 | acpi_ec_gpe_query, ec); | |
259 | } | |
260 | return 0; | |
261 | } | |
262 | ||
263 | static int ec_poll(struct acpi_ec *ec) | |
264 | { | |
265 | unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); | |
1cfe62c8 | 266 | udelay(ACPI_EC_UDELAY); |
7c6db4e0 AS |
267 | while (time_before(jiffies, delay)) { |
268 | gpe_transaction(ec, acpi_ec_read_status(ec)); | |
1cfe62c8 | 269 | udelay(ACPI_EC_UDELAY); |
7c6db4e0 | 270 | if (ec_transaction_done(ec)) |
9d699ed9 | 271 | return 0; |
af3fd140 | 272 | } |
b77d81b2 | 273 | return -ETIME; |
1da177e4 LT |
274 | } |
275 | ||
8463200a AS |
276 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
277 | struct transaction *t, | |
00eb43a1 | 278 | int force_poll) |
45bea155 | 279 | { |
7c6db4e0 | 280 | unsigned long tmp; |
7c6db4e0 | 281 | int ret = 0; |
3ebe08a7 | 282 | pr_debug(PREFIX "transaction start\n"); |
7c6db4e0 AS |
283 | /* disable GPE during transaction if storm is detected */ |
284 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
285 | clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); | |
0b7084ac | 286 | acpi_disable_gpe(NULL, ec->gpe); |
3576cf61 | 287 | } |
7c6db4e0 | 288 | /* start transaction */ |
8463200a | 289 | spin_lock_irqsave(&ec->curr_lock, tmp); |
7c6db4e0 | 290 | /* following two actions should be kept atomic */ |
8463200a | 291 | ec->curr = t; |
a2f93aea | 292 | start_transaction(ec); |
8463200a | 293 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) |
080e412c | 294 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
8463200a | 295 | spin_unlock_irqrestore(&ec->curr_lock, tmp); |
7c6db4e0 AS |
296 | /* if we selected poll mode or failed in GPE-mode do a poll loop */ |
297 | if (force_poll || | |
298 | !test_bit(EC_FLAGS_GPE_MODE, &ec->flags) || | |
299 | acpi_ec_wait(ec)) | |
300 | ret = ec_poll(ec); | |
3ebe08a7 | 301 | pr_debug(PREFIX "transaction end\n"); |
8463200a AS |
302 | spin_lock_irqsave(&ec->curr_lock, tmp); |
303 | ec->curr = NULL; | |
304 | spin_unlock_irqrestore(&ec->curr_lock, tmp); | |
7c6db4e0 AS |
305 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { |
306 | /* check if we received SCI during transaction */ | |
307 | ec_check_sci(ec, acpi_ec_read_status(ec)); | |
308 | /* it is safe to enable GPE outside of transaction */ | |
0b7084ac | 309 | acpi_enable_gpe(NULL, ec->gpe); |
7c6db4e0 | 310 | } else if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags) && |
8463200a | 311 | t->irq_count > ACPI_EC_STORM_THRESHOLD) { |
f8248434 AJ |
312 | pr_info(PREFIX "GPE storm detected, " |
313 | "transactions will use polling mode\n"); | |
7c6db4e0 AS |
314 | set_bit(EC_FLAGS_GPE_STORM, &ec->flags); |
315 | } | |
316 | return ret; | |
317 | } | |
318 | ||
319 | static int ec_check_ibf0(struct acpi_ec *ec) | |
320 | { | |
321 | u8 status = acpi_ec_read_status(ec); | |
322 | return (status & ACPI_EC_FLAG_IBF) == 0; | |
45bea155 LY |
323 | } |
324 | ||
c0ff1772 AS |
325 | static int ec_wait_ibf0(struct acpi_ec *ec) |
326 | { | |
327 | unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); | |
328 | /* interrupt wait manually if GPE mode is not active */ | |
329 | unsigned long timeout = test_bit(EC_FLAGS_GPE_MODE, &ec->flags) ? | |
330 | msecs_to_jiffies(ACPI_EC_DELAY) : msecs_to_jiffies(1); | |
331 | while (time_before(jiffies, delay)) | |
332 | if (wait_event_timeout(ec->wait, ec_check_ibf0(ec), timeout)) | |
333 | return 0; | |
334 | return -ETIME; | |
45bea155 LY |
335 | } |
336 | ||
8463200a | 337 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t, |
00eb43a1 | 338 | int force_poll) |
1da177e4 | 339 | { |
d7a76e4c | 340 | int status; |
50526df6 | 341 | u32 glk; |
8463200a | 342 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
d550d98d | 343 | return -EINVAL; |
8463200a AS |
344 | if (t->rdata) |
345 | memset(t->rdata, 0, t->rlen); | |
523953b4 | 346 | mutex_lock(&ec->lock); |
703959d4 | 347 | if (ec->global_lock) { |
1da177e4 | 348 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 349 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
350 | status = -ENODEV; |
351 | goto unlock; | |
c24e912b | 352 | } |
1da177e4 | 353 | } |
c0ff1772 | 354 | if (ec_wait_ibf0(ec)) { |
3ebe08a7 MN |
355 | pr_err(PREFIX "input buffer is not empty, " |
356 | "aborting transaction\n"); | |
7c6db4e0 | 357 | status = -ETIME; |
451566f4 | 358 | goto end; |
716e084e | 359 | } |
8463200a | 360 | status = acpi_ec_transaction_unlocked(ec, t, force_poll); |
7c6db4e0 | 361 | end: |
703959d4 | 362 | if (ec->global_lock) |
1da177e4 | 363 | acpi_release_global_lock(glk); |
7c6db4e0 | 364 | unlock: |
523953b4 | 365 | mutex_unlock(&ec->lock); |
d550d98d | 366 | return status; |
1da177e4 LT |
367 | } |
368 | ||
c45aac43 AS |
369 | /* |
370 | * Note: samsung nv5000 doesn't work with ec burst mode. | |
371 | * http://bugzilla.kernel.org/show_bug.cgi?id=4980 | |
372 | */ | |
373 | int acpi_ec_burst_enable(struct acpi_ec *ec) | |
374 | { | |
375 | u8 d; | |
8463200a AS |
376 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
377 | .wdata = NULL, .rdata = &d, | |
378 | .wlen = 0, .rlen = 1}; | |
379 | ||
380 | return acpi_ec_transaction(ec, &t, 0); | |
c45aac43 AS |
381 | } |
382 | ||
383 | int acpi_ec_burst_disable(struct acpi_ec *ec) | |
384 | { | |
8463200a AS |
385 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
386 | .wdata = NULL, .rdata = NULL, | |
387 | .wlen = 0, .rlen = 0}; | |
388 | ||
7c6db4e0 | 389 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
8463200a | 390 | acpi_ec_transaction(ec, &t, 0) : 0; |
c45aac43 AS |
391 | } |
392 | ||
6ccedb10 | 393 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) |
3576cf61 DS |
394 | { |
395 | int result; | |
396 | u8 d; | |
8463200a AS |
397 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
398 | .wdata = &address, .rdata = &d, | |
399 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 400 | |
8463200a | 401 | result = acpi_ec_transaction(ec, &t, 0); |
3576cf61 DS |
402 | *data = d; |
403 | return result; | |
404 | } | |
6ffb221a | 405 | |
3576cf61 DS |
406 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
407 | { | |
6ccedb10 | 408 | u8 wdata[2] = { address, data }; |
8463200a AS |
409 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
410 | .wdata = wdata, .rdata = NULL, | |
411 | .wlen = 2, .rlen = 0}; | |
412 | ||
413 | return acpi_ec_transaction(ec, &t, 0); | |
3576cf61 DS |
414 | } |
415 | ||
1da177e4 LT |
416 | /* |
417 | * Externally callable EC access functions. For now, assume 1 EC only | |
418 | */ | |
c45aac43 AS |
419 | int ec_burst_enable(void) |
420 | { | |
c45aac43 AS |
421 | if (!first_ec) |
422 | return -ENODEV; | |
d033879c | 423 | return acpi_ec_burst_enable(first_ec); |
c45aac43 AS |
424 | } |
425 | ||
426 | EXPORT_SYMBOL(ec_burst_enable); | |
427 | ||
428 | int ec_burst_disable(void) | |
429 | { | |
c45aac43 AS |
430 | if (!first_ec) |
431 | return -ENODEV; | |
d033879c | 432 | return acpi_ec_burst_disable(first_ec); |
c45aac43 AS |
433 | } |
434 | ||
435 | EXPORT_SYMBOL(ec_burst_disable); | |
436 | ||
6ccedb10 | 437 | int ec_read(u8 addr, u8 * val) |
1da177e4 | 438 | { |
1da177e4 | 439 | int err; |
6ffb221a | 440 | u8 temp_data; |
1da177e4 LT |
441 | |
442 | if (!first_ec) | |
443 | return -ENODEV; | |
444 | ||
d033879c | 445 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
446 | |
447 | if (!err) { | |
448 | *val = temp_data; | |
449 | return 0; | |
50526df6 | 450 | } else |
1da177e4 LT |
451 | return err; |
452 | } | |
50526df6 | 453 | |
1da177e4 LT |
454 | EXPORT_SYMBOL(ec_read); |
455 | ||
50526df6 | 456 | int ec_write(u8 addr, u8 val) |
1da177e4 | 457 | { |
1da177e4 LT |
458 | int err; |
459 | ||
460 | if (!first_ec) | |
461 | return -ENODEV; | |
462 | ||
d033879c | 463 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
464 | |
465 | return err; | |
466 | } | |
50526df6 | 467 | |
1da177e4 LT |
468 | EXPORT_SYMBOL(ec_write); |
469 | ||
616362de | 470 | int ec_transaction(u8 command, |
9e197219 | 471 | const u8 * wdata, unsigned wdata_len, |
00eb43a1 LP |
472 | u8 * rdata, unsigned rdata_len, |
473 | int force_poll) | |
45bea155 | 474 | { |
8463200a AS |
475 | struct transaction t = {.command = command, |
476 | .wdata = wdata, .rdata = rdata, | |
477 | .wlen = wdata_len, .rlen = rdata_len}; | |
d7a76e4c LP |
478 | if (!first_ec) |
479 | return -ENODEV; | |
45bea155 | 480 | |
8463200a | 481 | return acpi_ec_transaction(first_ec, &t, force_poll); |
45bea155 | 482 | } |
1da177e4 | 483 | |
ab9e43c6 LP |
484 | EXPORT_SYMBOL(ec_transaction); |
485 | ||
6ccedb10 | 486 | static int acpi_ec_query(struct acpi_ec *ec, u8 * data) |
3576cf61 DS |
487 | { |
488 | int result; | |
6ccedb10 | 489 | u8 d; |
8463200a AS |
490 | struct transaction t = {.command = ACPI_EC_COMMAND_QUERY, |
491 | .wdata = NULL, .rdata = &d, | |
492 | .wlen = 0, .rlen = 1}; | |
6ccedb10 AS |
493 | if (!ec || !data) |
494 | return -EINVAL; | |
1da177e4 | 495 | |
6ccedb10 AS |
496 | /* |
497 | * Query the EC to find out which _Qxx method we need to evaluate. | |
498 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
499 | * bit to be cleared (and thus clearing the interrupt source). | |
500 | */ | |
716e084e | 501 | |
8463200a | 502 | result = acpi_ec_transaction(ec, &t, 0); |
6ccedb10 AS |
503 | if (result) |
504 | return result; | |
1da177e4 | 505 | |
6ccedb10 AS |
506 | if (!d) |
507 | return -ENODATA; | |
1da177e4 | 508 | |
6ccedb10 AS |
509 | *data = d; |
510 | return 0; | |
1da177e4 LT |
511 | } |
512 | ||
1da177e4 LT |
513 | /* -------------------------------------------------------------------------- |
514 | Event Management | |
515 | -------------------------------------------------------------------------- */ | |
837012ed AS |
516 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
517 | acpi_handle handle, acpi_ec_query_func func, | |
518 | void *data) | |
519 | { | |
520 | struct acpi_ec_query_handler *handler = | |
521 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
522 | if (!handler) | |
523 | return -ENOMEM; | |
524 | ||
525 | handler->query_bit = query_bit; | |
526 | handler->handle = handle; | |
527 | handler->func = func; | |
528 | handler->data = data; | |
529 | mutex_lock(&ec->lock); | |
30c08574 | 530 | list_add(&handler->node, &ec->list); |
837012ed AS |
531 | mutex_unlock(&ec->lock); |
532 | return 0; | |
533 | } | |
534 | ||
535 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); | |
536 | ||
537 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
538 | { | |
1544fdbc | 539 | struct acpi_ec_query_handler *handler, *tmp; |
837012ed | 540 | mutex_lock(&ec->lock); |
1544fdbc | 541 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
542 | if (query_bit == handler->query_bit) { |
543 | list_del(&handler->node); | |
544 | kfree(handler); | |
837012ed AS |
545 | } |
546 | } | |
547 | mutex_unlock(&ec->lock); | |
548 | } | |
549 | ||
550 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); | |
1da177e4 | 551 | |
50526df6 | 552 | static void acpi_ec_gpe_query(void *ec_cxt) |
45bea155 | 553 | { |
3d02b90b | 554 | struct acpi_ec *ec = ec_cxt; |
6ffb221a | 555 | u8 value = 0; |
837012ed | 556 | struct acpi_ec_query_handler *handler, copy; |
45bea155 | 557 | |
5d0c288b | 558 | if (!ec || acpi_ec_query(ec, &value)) |
e41334c0 | 559 | return; |
837012ed AS |
560 | mutex_lock(&ec->lock); |
561 | list_for_each_entry(handler, &ec->list, node) { | |
562 | if (value == handler->query_bit) { | |
563 | /* have custom handler for this bit */ | |
564 | memcpy(©, handler, sizeof(copy)); | |
565 | mutex_unlock(&ec->lock); | |
566 | if (copy.func) { | |
567 | copy.func(copy.data); | |
568 | } else if (copy.handle) { | |
569 | acpi_evaluate_object(copy.handle, NULL, NULL, NULL); | |
570 | } | |
571 | return; | |
572 | } | |
573 | } | |
574 | mutex_unlock(&ec->lock); | |
45bea155 | 575 | } |
1da177e4 | 576 | |
50526df6 | 577 | static u32 acpi_ec_gpe_handler(void *data) |
1da177e4 | 578 | { |
3d02b90b | 579 | struct acpi_ec *ec = data; |
7c6db4e0 | 580 | u8 status; |
00eb43a1 | 581 | |
3ebe08a7 | 582 | pr_debug(PREFIX "~~~> interrupt\n"); |
7c6db4e0 AS |
583 | status = acpi_ec_read_status(ec); |
584 | ||
8517934e AS |
585 | if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags)) { |
586 | gpe_transaction(ec, status); | |
587 | if (ec_transaction_done(ec) && | |
588 | (status & ACPI_EC_FLAG_IBF) == 0) | |
589 | wake_up(&ec->wait); | |
590 | } | |
451566f4 | 591 | |
7c6db4e0 AS |
592 | ec_check_sci(ec, status); |
593 | if (!test_bit(EC_FLAGS_GPE_MODE, &ec->flags) && | |
594 | !test_bit(EC_FLAGS_NO_GPE, &ec->flags)) { | |
95b937e3 | 595 | /* this is non-query, must be confirmation */ |
f8248434 AJ |
596 | if (!test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { |
597 | if (printk_ratelimit()) | |
598 | pr_info(PREFIX "non-query interrupt received," | |
599 | " switching to interrupt mode\n"); | |
600 | } else { | |
601 | /* hush, STORM switches the mode every transaction */ | |
602 | pr_debug(PREFIX "non-query interrupt received," | |
3ebe08a7 | 603 | " switching to interrupt mode\n"); |
f8248434 | 604 | } |
7843932a | 605 | set_bit(EC_FLAGS_GPE_MODE, &ec->flags); |
95b937e3 | 606 | } |
7c6db4e0 | 607 | return ACPI_INTERRUPT_HANDLED; |
845625cd AS |
608 | } |
609 | ||
1da177e4 LT |
610 | /* -------------------------------------------------------------------------- |
611 | Address Space Management | |
612 | -------------------------------------------------------------------------- */ | |
613 | ||
1da177e4 | 614 | static acpi_status |
5b7734b4 AS |
615 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
616 | u32 bits, acpi_integer *value, | |
50526df6 | 617 | void *handler_context, void *region_context) |
1da177e4 | 618 | { |
3d02b90b | 619 | struct acpi_ec *ec = handler_context; |
3e71a87d | 620 | int result = 0, i; |
5b7734b4 | 621 | u8 temp = 0; |
1da177e4 | 622 | |
1da177e4 | 623 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 624 | return AE_BAD_PARAMETER; |
1da177e4 | 625 | |
5b7734b4 | 626 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 627 | return AE_BAD_PARAMETER; |
1da177e4 | 628 | |
5b7734b4 AS |
629 | if (bits != 8 && acpi_strict) |
630 | return AE_BAD_PARAMETER; | |
1da177e4 | 631 | |
b3b233c7 AS |
632 | acpi_ec_burst_enable(ec); |
633 | ||
3e71a87d AS |
634 | if (function == ACPI_READ) { |
635 | result = acpi_ec_read(ec, address, &temp); | |
636 | *value = temp; | |
637 | } else { | |
638 | temp = 0xff & (*value); | |
639 | result = acpi_ec_write(ec, address, temp); | |
640 | } | |
641 | ||
642 | for (i = 8; unlikely(bits - i > 0); i += 8) { | |
643 | ++address; | |
5b7734b4 AS |
644 | if (function == ACPI_READ) { |
645 | result = acpi_ec_read(ec, address, &temp); | |
646 | (*value) |= ((acpi_integer)temp) << i; | |
647 | } else { | |
648 | temp = 0xff & ((*value) >> i); | |
649 | result = acpi_ec_write(ec, address, temp); | |
650 | } | |
1da177e4 LT |
651 | } |
652 | ||
b3b233c7 AS |
653 | acpi_ec_burst_disable(ec); |
654 | ||
1da177e4 LT |
655 | switch (result) { |
656 | case -EINVAL: | |
d550d98d | 657 | return AE_BAD_PARAMETER; |
1da177e4 LT |
658 | break; |
659 | case -ENODEV: | |
d550d98d | 660 | return AE_NOT_FOUND; |
1da177e4 LT |
661 | break; |
662 | case -ETIME: | |
d550d98d | 663 | return AE_TIME; |
1da177e4 LT |
664 | break; |
665 | default: | |
d550d98d | 666 | return AE_OK; |
1da177e4 | 667 | } |
1da177e4 LT |
668 | } |
669 | ||
1da177e4 LT |
670 | /* -------------------------------------------------------------------------- |
671 | FS Interface (/proc) | |
672 | -------------------------------------------------------------------------- */ | |
673 | ||
50526df6 | 674 | static struct proc_dir_entry *acpi_ec_dir; |
1da177e4 | 675 | |
50526df6 | 676 | static int acpi_ec_read_info(struct seq_file *seq, void *offset) |
1da177e4 | 677 | { |
3d02b90b | 678 | struct acpi_ec *ec = seq->private; |
1da177e4 | 679 | |
1da177e4 LT |
680 | if (!ec) |
681 | goto end; | |
682 | ||
01f22462 AS |
683 | seq_printf(seq, "gpe:\t\t\t0x%02x\n", (u32) ec->gpe); |
684 | seq_printf(seq, "ports:\t\t\t0x%02x, 0x%02x\n", | |
685 | (unsigned)ec->command_addr, (unsigned)ec->data_addr); | |
686 | seq_printf(seq, "use global lock:\t%s\n", | |
703959d4 | 687 | ec->global_lock ? "yes" : "no"); |
50526df6 | 688 | end: |
d550d98d | 689 | return 0; |
1da177e4 LT |
690 | } |
691 | ||
692 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) | |
693 | { | |
694 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); | |
695 | } | |
696 | ||
703959d4 | 697 | static struct file_operations acpi_ec_info_ops = { |
50526df6 LB |
698 | .open = acpi_ec_info_open_fs, |
699 | .read = seq_read, | |
700 | .llseek = seq_lseek, | |
701 | .release = single_release, | |
1da177e4 LT |
702 | .owner = THIS_MODULE, |
703 | }; | |
704 | ||
50526df6 | 705 | static int acpi_ec_add_fs(struct acpi_device *device) |
1da177e4 | 706 | { |
50526df6 | 707 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 708 | |
1da177e4 LT |
709 | if (!acpi_device_dir(device)) { |
710 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
50526df6 | 711 | acpi_ec_dir); |
1da177e4 | 712 | if (!acpi_device_dir(device)) |
d550d98d | 713 | return -ENODEV; |
1da177e4 LT |
714 | } |
715 | ||
cf7acfab DL |
716 | entry = proc_create_data(ACPI_EC_FILE_INFO, S_IRUGO, |
717 | acpi_device_dir(device), | |
718 | &acpi_ec_info_ops, acpi_driver_data(device)); | |
1da177e4 | 719 | if (!entry) |
d550d98d | 720 | return -ENODEV; |
d550d98d | 721 | return 0; |
1da177e4 LT |
722 | } |
723 | ||
50526df6 | 724 | static int acpi_ec_remove_fs(struct acpi_device *device) |
1da177e4 | 725 | { |
1da177e4 LT |
726 | |
727 | if (acpi_device_dir(device)) { | |
728 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); | |
729 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); | |
730 | acpi_device_dir(device) = NULL; | |
731 | } | |
732 | ||
d550d98d | 733 | return 0; |
1da177e4 LT |
734 | } |
735 | ||
1da177e4 LT |
736 | /* -------------------------------------------------------------------------- |
737 | Driver Interface | |
738 | -------------------------------------------------------------------------- */ | |
c0900c35 AS |
739 | static acpi_status |
740 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
741 | ||
c0900c35 AS |
742 | static struct acpi_ec *make_acpi_ec(void) |
743 | { | |
744 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
745 | if (!ec) | |
746 | return NULL; | |
080e412c | 747 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
c0900c35 AS |
748 | mutex_init(&ec->lock); |
749 | init_waitqueue_head(&ec->wait); | |
837012ed | 750 | INIT_LIST_HEAD(&ec->list); |
8463200a | 751 | spin_lock_init(&ec->curr_lock); |
c0900c35 AS |
752 | return ec; |
753 | } | |
837012ed | 754 | |
c019b193 AS |
755 | static acpi_status |
756 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
757 | void *context, void **return_value) | |
758 | { | |
759 | struct acpi_namespace_node *node = handle; | |
760 | struct acpi_ec *ec = context; | |
761 | int value = 0; | |
762 | if (sscanf(node->name.ascii, "_Q%x", &value) == 1) { | |
763 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); | |
764 | } | |
765 | return AE_OK; | |
766 | } | |
767 | ||
cd8c93a4 AS |
768 | static acpi_status |
769 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 770 | { |
cd8c93a4 | 771 | acpi_status status; |
d21cf3c1 | 772 | unsigned long long tmp = 0; |
cd8c93a4 AS |
773 | |
774 | struct acpi_ec *ec = context; | |
775 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, | |
776 | ec_parse_io_ports, ec); | |
777 | if (ACPI_FAILURE(status)) | |
778 | return status; | |
837012ed AS |
779 | |
780 | /* Get GPE bit assignment (EC events). */ | |
781 | /* TODO: Add support for _GPE returning a package */ | |
27663c58 | 782 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
cd8c93a4 AS |
783 | if (ACPI_FAILURE(status)) |
784 | return status; | |
27663c58 | 785 | ec->gpe = tmp; |
837012ed | 786 | /* Use the global lock for all EC transactions? */ |
d21cf3c1 | 787 | tmp = 0; |
27663c58 MW |
788 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
789 | ec->global_lock = tmp; | |
837012ed | 790 | ec->handle = handle; |
cd8c93a4 | 791 | return AE_CTRL_TERMINATE; |
837012ed AS |
792 | } |
793 | ||
4c611060 AS |
794 | static void ec_remove_handlers(struct acpi_ec *ec) |
795 | { | |
796 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, | |
797 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
3ebe08a7 | 798 | pr_err(PREFIX "failed to remove space handler\n"); |
4c611060 AS |
799 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
800 | &acpi_ec_gpe_handler))) | |
3ebe08a7 | 801 | pr_err(PREFIX "failed to remove gpe handler\n"); |
7c6db4e0 | 802 | clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
4c611060 AS |
803 | } |
804 | ||
703959d4 | 805 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 806 | { |
703959d4 | 807 | struct acpi_ec *ec = NULL; |
45bea155 | 808 | |
45bea155 | 809 | if (!device) |
d550d98d | 810 | return -EINVAL; |
c0900c35 AS |
811 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
812 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
813 | ||
4c611060 | 814 | /* Check for boot EC */ |
ce52ddf5 AS |
815 | if (boot_ec && |
816 | (boot_ec->handle == device->handle || | |
817 | boot_ec->handle == ACPI_ROOT_OBJECT)) { | |
818 | ec = boot_ec; | |
819 | boot_ec = NULL; | |
820 | } else { | |
821 | ec = make_acpi_ec(); | |
822 | if (!ec) | |
823 | return -ENOMEM; | |
824 | if (ec_parse_device(device->handle, 0, ec, NULL) != | |
825 | AE_CTRL_TERMINATE) { | |
826 | kfree(ec); | |
827 | return -EINVAL; | |
4c611060 AS |
828 | } |
829 | } | |
830 | ||
c0900c35 | 831 | ec->handle = device->handle; |
ce52ddf5 AS |
832 | |
833 | /* Find and register all query methods */ | |
834 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
835 | acpi_ec_register_query_methods, ec, NULL); | |
836 | ||
4c611060 AS |
837 | if (!first_ec) |
838 | first_ec = ec; | |
db89b4f0 | 839 | device->driver_data = ec; |
c0900c35 | 840 | acpi_ec_add_fs(device); |
3ebe08a7 | 841 | pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 842 | ec->gpe, ec->command_addr, ec->data_addr); |
3ebe08a7 | 843 | pr_info(PREFIX "driver started in %s mode\n", |
95b937e3 | 844 | (test_bit(EC_FLAGS_GPE_MODE, &ec->flags))?"interrupt":"poll"); |
c0900c35 | 845 | return 0; |
1da177e4 LT |
846 | } |
847 | ||
50526df6 | 848 | static int acpi_ec_remove(struct acpi_device *device, int type) |
1da177e4 | 849 | { |
01f22462 | 850 | struct acpi_ec *ec; |
07ddf768 | 851 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 852 | |
1da177e4 | 853 | if (!device) |
d550d98d | 854 | return -EINVAL; |
1da177e4 LT |
855 | |
856 | ec = acpi_driver_data(device); | |
837012ed | 857 | mutex_lock(&ec->lock); |
07ddf768 | 858 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
859 | list_del(&handler->node); |
860 | kfree(handler); | |
861 | } | |
862 | mutex_unlock(&ec->lock); | |
1da177e4 | 863 | acpi_ec_remove_fs(device); |
db89b4f0 | 864 | device->driver_data = NULL; |
d033879c | 865 | if (ec == first_ec) |
c0900c35 | 866 | first_ec = NULL; |
4c611060 | 867 | kfree(ec); |
d550d98d | 868 | return 0; |
1da177e4 LT |
869 | } |
870 | ||
1da177e4 | 871 | static acpi_status |
c0900c35 | 872 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 873 | { |
3d02b90b | 874 | struct acpi_ec *ec = context; |
1da177e4 | 875 | |
01f22462 | 876 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 877 | return AE_OK; |
1da177e4 LT |
878 | |
879 | /* | |
880 | * The first address region returned is the data port, and | |
881 | * the second address region returned is the status/command | |
882 | * port. | |
883 | */ | |
01f22462 | 884 | if (ec->data_addr == 0) |
6ffb221a | 885 | ec->data_addr = resource->data.io.minimum; |
01f22462 | 886 | else if (ec->command_addr == 0) |
6ffb221a | 887 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 888 | else |
1da177e4 | 889 | return AE_CTRL_TERMINATE; |
1da177e4 | 890 | |
1da177e4 LT |
891 | return AE_OK; |
892 | } | |
893 | ||
e8284321 AS |
894 | static int ec_install_handlers(struct acpi_ec *ec) |
895 | { | |
c0900c35 | 896 | acpi_status status; |
7c6db4e0 | 897 | if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) |
4c611060 | 898 | return 0; |
c0900c35 | 899 | status = acpi_install_gpe_handler(NULL, ec->gpe, |
7c6db4e0 AS |
900 | ACPI_GPE_EDGE_TRIGGERED, |
901 | &acpi_ec_gpe_handler, ec); | |
e8284321 AS |
902 | if (ACPI_FAILURE(status)) |
903 | return -ENODEV; | |
904 | acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); | |
0b7084ac | 905 | acpi_enable_gpe(NULL, ec->gpe); |
e8284321 AS |
906 | status = acpi_install_address_space_handler(ec->handle, |
907 | ACPI_ADR_SPACE_EC, | |
908 | &acpi_ec_space_handler, | |
6d9e1120 | 909 | NULL, ec); |
e8284321 | 910 | if (ACPI_FAILURE(status)) { |
20edd74f ZY |
911 | if (status == AE_NOT_FOUND) { |
912 | /* | |
913 | * Maybe OS fails in evaluating the _REG object. | |
914 | * The AE_NOT_FOUND error will be ignored and OS | |
915 | * continue to initialize EC. | |
916 | */ | |
917 | printk(KERN_ERR "Fail in evaluating the _REG object" | |
918 | " of EC device. Broken bios is suspected.\n"); | |
919 | } else { | |
920 | acpi_remove_gpe_handler(NULL, ec->gpe, | |
921 | &acpi_ec_gpe_handler); | |
922 | return -ENODEV; | |
923 | } | |
e8284321 AS |
924 | } |
925 | ||
7c6db4e0 | 926 | set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
e8284321 AS |
927 | return 0; |
928 | } | |
929 | ||
50526df6 | 930 | static int acpi_ec_start(struct acpi_device *device) |
1da177e4 | 931 | { |
c0900c35 | 932 | struct acpi_ec *ec; |
837012ed | 933 | int ret = 0; |
1da177e4 | 934 | |
1da177e4 | 935 | if (!device) |
d550d98d | 936 | return -EINVAL; |
1da177e4 LT |
937 | |
938 | ec = acpi_driver_data(device); | |
939 | ||
940 | if (!ec) | |
d550d98d | 941 | return -EINVAL; |
1da177e4 | 942 | |
4c611060 | 943 | ret = ec_install_handlers(ec); |
837012ed AS |
944 | |
945 | /* EC is fully operational, allow queries */ | |
080e412c | 946 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
837012ed | 947 | return ret; |
1da177e4 LT |
948 | } |
949 | ||
50526df6 | 950 | static int acpi_ec_stop(struct acpi_device *device, int type) |
1da177e4 | 951 | { |
c0900c35 | 952 | struct acpi_ec *ec; |
1da177e4 | 953 | if (!device) |
d550d98d | 954 | return -EINVAL; |
1da177e4 | 955 | ec = acpi_driver_data(device); |
c0900c35 AS |
956 | if (!ec) |
957 | return -EINVAL; | |
4c611060 | 958 | ec_remove_handlers(ec); |
f9319f90 | 959 | |
d550d98d | 960 | return 0; |
1da177e4 LT |
961 | } |
962 | ||
c04209a7 AS |
963 | int __init acpi_boot_ec_enable(void) |
964 | { | |
7c6db4e0 | 965 | if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags)) |
c04209a7 AS |
966 | return 0; |
967 | if (!ec_install_handlers(boot_ec)) { | |
968 | first_ec = boot_ec; | |
969 | return 0; | |
970 | } | |
971 | return -EFAULT; | |
972 | } | |
973 | ||
223883b7 AS |
974 | static const struct acpi_device_id ec_device_ids[] = { |
975 | {"PNP0C09", 0}, | |
976 | {"", 0}, | |
977 | }; | |
978 | ||
c0900c35 AS |
979 | int __init acpi_ec_ecdt_probe(void) |
980 | { | |
981 | int ret; | |
982 | acpi_status status; | |
50526df6 | 983 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 984 | |
d66d969d AS |
985 | boot_ec = make_acpi_ec(); |
986 | if (!boot_ec) | |
c0900c35 AS |
987 | return -ENOMEM; |
988 | /* | |
989 | * Generate a boot ec context | |
990 | */ | |
15a58ed1 AS |
991 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
992 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 993 | if (ACPI_SUCCESS(status)) { |
3ebe08a7 | 994 | pr_info(PREFIX "EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
995 | boot_ec->command_addr = ecdt_ptr->control.address; |
996 | boot_ec->data_addr = ecdt_ptr->data.address; | |
2500822b ZY |
997 | if (dmi_check_system(ec_dmi_table)) { |
998 | /* | |
999 | * If the board falls into ec_dmi_table, it means | |
1000 | * that ECDT table gives the incorrect command/status | |
1001 | * & data I/O address. Just fix it. | |
1002 | */ | |
1003 | boot_ec->data_addr = ecdt_ptr->control.address; | |
1004 | boot_ec->command_addr = ecdt_ptr->data.address; | |
1005 | } | |
cd8c93a4 | 1006 | boot_ec->gpe = ecdt_ptr->gpe; |
4af8e10a | 1007 | boot_ec->handle = ACPI_ROOT_OBJECT; |
ce52ddf5 | 1008 | acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle); |
cd8c93a4 | 1009 | } else { |
5870a8cd AS |
1010 | /* This workaround is needed only on some broken machines, |
1011 | * which require early EC, but fail to provide ECDT */ | |
1012 | acpi_handle x; | |
cd8c93a4 AS |
1013 | printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n"); |
1014 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, | |
1015 | boot_ec, NULL); | |
2d8348b4 AS |
1016 | /* Check that acpi_get_devices actually find something */ |
1017 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
cd8c93a4 | 1018 | goto error; |
5870a8cd AS |
1019 | /* We really need to limit this workaround, the only ASUS, |
1020 | * which needs it, has fake EC._INI method, so use it as flag. | |
c04209a7 | 1021 | * Keep boot_ec struct as it will be needed soon. |
5870a8cd AS |
1022 | */ |
1023 | if (ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", &x))) | |
c04209a7 | 1024 | return -ENODEV; |
cd8c93a4 | 1025 | } |
1da177e4 | 1026 | |
d66d969d | 1027 | ret = ec_install_handlers(boot_ec); |
d033879c AS |
1028 | if (!ret) { |
1029 | first_ec = boot_ec; | |
e8284321 | 1030 | return 0; |
d033879c | 1031 | } |
c0900c35 | 1032 | error: |
d66d969d AS |
1033 | kfree(boot_ec); |
1034 | boot_ec = NULL; | |
1da177e4 LT |
1035 | return -ENODEV; |
1036 | } | |
1037 | ||
223883b7 AS |
1038 | static int acpi_ec_suspend(struct acpi_device *device, pm_message_t state) |
1039 | { | |
1040 | struct acpi_ec *ec = acpi_driver_data(device); | |
1041 | /* Stop using GPE */ | |
1042 | set_bit(EC_FLAGS_NO_GPE, &ec->flags); | |
1043 | clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); | |
0b7084ac | 1044 | acpi_disable_gpe(NULL, ec->gpe); |
223883b7 AS |
1045 | return 0; |
1046 | } | |
1047 | ||
1048 | static int acpi_ec_resume(struct acpi_device *device) | |
1049 | { | |
1050 | struct acpi_ec *ec = acpi_driver_data(device); | |
1051 | /* Enable use of GPE back */ | |
1052 | clear_bit(EC_FLAGS_NO_GPE, &ec->flags); | |
0b7084ac | 1053 | acpi_enable_gpe(NULL, ec->gpe); |
223883b7 AS |
1054 | return 0; |
1055 | } | |
1056 | ||
1057 | static struct acpi_driver acpi_ec_driver = { | |
1058 | .name = "ec", | |
1059 | .class = ACPI_EC_CLASS, | |
1060 | .ids = ec_device_ids, | |
1061 | .ops = { | |
1062 | .add = acpi_ec_add, | |
1063 | .remove = acpi_ec_remove, | |
1064 | .start = acpi_ec_start, | |
1065 | .stop = acpi_ec_stop, | |
1066 | .suspend = acpi_ec_suspend, | |
1067 | .resume = acpi_ec_resume, | |
1068 | }, | |
1069 | }; | |
1070 | ||
50526df6 | 1071 | static int __init acpi_ec_init(void) |
1da177e4 | 1072 | { |
50526df6 | 1073 | int result = 0; |
1da177e4 | 1074 | |
1da177e4 | 1075 | if (acpi_disabled) |
d550d98d | 1076 | return 0; |
1da177e4 LT |
1077 | |
1078 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); | |
1079 | if (!acpi_ec_dir) | |
d550d98d | 1080 | return -ENODEV; |
1da177e4 LT |
1081 | |
1082 | /* Now register the driver for the EC */ | |
1083 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
1084 | if (result < 0) { | |
1085 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
d550d98d | 1086 | return -ENODEV; |
1da177e4 LT |
1087 | } |
1088 | ||
d550d98d | 1089 | return result; |
1da177e4 LT |
1090 | } |
1091 | ||
1092 | subsys_initcall(acpi_ec_init); | |
1093 | ||
1094 | /* EC driver currently not unloadable */ | |
1095 | #if 0 | |
50526df6 | 1096 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1097 | { |
1da177e4 LT |
1098 | |
1099 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
1100 | ||
1101 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); | |
1102 | ||
d550d98d | 1103 | return; |
1da177e4 | 1104 | } |
7843932a | 1105 | #endif /* 0 */ |