Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * acpi_ec.c - ACPI Embedded Controller Driver ($Revision: 38 $) |
| 3 | * |
| 4 | * Copyright (C) 2004 Luming Yu <luming.yu@intel.com> |
| 5 | * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> |
| 6 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> |
| 7 | * |
| 8 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or (at |
| 13 | * your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, but |
| 16 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 18 | * General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License along |
| 21 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 22 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. |
| 23 | * |
| 24 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 25 | */ |
| 26 | |
| 27 | #include <linux/kernel.h> |
| 28 | #include <linux/module.h> |
| 29 | #include <linux/init.h> |
| 30 | #include <linux/types.h> |
| 31 | #include <linux/delay.h> |
| 32 | #include <linux/proc_fs.h> |
| 33 | #include <linux/seq_file.h> |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 34 | #include <linux/interrupt.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <asm/io.h> |
| 36 | #include <acpi/acpi_bus.h> |
| 37 | #include <acpi/acpi_drivers.h> |
| 38 | #include <acpi/actypes.h> |
| 39 | |
| 40 | #define _COMPONENT ACPI_EC_COMPONENT |
| 41 | ACPI_MODULE_NAME ("acpi_ec") |
| 42 | |
| 43 | #define ACPI_EC_COMPONENT 0x00100000 |
| 44 | #define ACPI_EC_CLASS "embedded_controller" |
| 45 | #define ACPI_EC_HID "PNP0C09" |
| 46 | #define ACPI_EC_DRIVER_NAME "ACPI Embedded Controller Driver" |
| 47 | #define ACPI_EC_DEVICE_NAME "Embedded Controller" |
| 48 | #define ACPI_EC_FILE_INFO "info" |
| 49 | |
| 50 | |
| 51 | #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */ |
| 52 | #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */ |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 53 | #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */ |
| 55 | |
| 56 | #define ACPI_EC_EVENT_OBF 0x01 /* Output buffer full */ |
| 57 | #define ACPI_EC_EVENT_IBE 0x02 /* Input buffer empty */ |
| 58 | |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 59 | #define ACPI_EC_DELAY 50 /* Wait 50ms max. during EC ops */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ |
| 61 | |
| 62 | #define ACPI_EC_COMMAND_READ 0x80 |
| 63 | #define ACPI_EC_COMMAND_WRITE 0x81 |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 64 | #define ACPI_EC_BURST_ENABLE 0x82 |
| 65 | #define ACPI_EC_BURST_DISABLE 0x83 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | #define ACPI_EC_COMMAND_QUERY 0x84 |
| 67 | |
| 68 | static int acpi_ec_add (struct acpi_device *device); |
| 69 | static int acpi_ec_remove (struct acpi_device *device, int type); |
| 70 | static int acpi_ec_start (struct acpi_device *device); |
| 71 | static int acpi_ec_stop (struct acpi_device *device, int type); |
| 72 | |
| 73 | static struct acpi_driver acpi_ec_driver = { |
| 74 | .name = ACPI_EC_DRIVER_NAME, |
| 75 | .class = ACPI_EC_CLASS, |
| 76 | .ids = ACPI_EC_HID, |
| 77 | .ops = { |
| 78 | .add = acpi_ec_add, |
| 79 | .remove = acpi_ec_remove, |
| 80 | .start = acpi_ec_start, |
| 81 | .stop = acpi_ec_stop, |
| 82 | }, |
| 83 | }; |
| 84 | |
| 85 | struct acpi_ec { |
| 86 | acpi_handle handle; |
| 87 | unsigned long uid; |
| 88 | unsigned long gpe_bit; |
| 89 | struct acpi_generic_address status_addr; |
| 90 | struct acpi_generic_address command_addr; |
| 91 | struct acpi_generic_address data_addr; |
| 92 | unsigned long global_lock; |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 93 | unsigned int expect_event; |
| 94 | atomic_t leaving_burst; /* 0 : No, 1 : Yes, 2: abort*/ |
| 95 | atomic_t pending_gpe; |
| 96 | struct semaphore sem; |
| 97 | wait_queue_head_t wait; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | }; |
| 99 | |
| 100 | /* If we find an EC via the ECDT, we need to keep a ptr to its context */ |
| 101 | static struct acpi_ec *ec_ecdt; |
| 102 | |
| 103 | /* External interfaces use first EC only, so remember */ |
| 104 | static struct acpi_device *first_ec; |
| 105 | |
| 106 | /* -------------------------------------------------------------------------- |
| 107 | Transaction Management |
| 108 | -------------------------------------------------------------------------- */ |
| 109 | |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 110 | static inline u32 acpi_ec_read_status(struct acpi_ec *ec) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | { |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 112 | u32 status = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 114 | acpi_hw_low_level_read(8, &status, &ec->status_addr); |
| 115 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | } |
| 117 | |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 118 | static int acpi_ec_wait(struct acpi_ec *ec, unsigned int event) |
| 119 | { |
| 120 | int result = 0; |
| 121 | |
| 122 | ACPI_FUNCTION_TRACE("acpi_ec_wait"); |
| 123 | |
| 124 | ec->expect_event = event; |
| 125 | smp_mb(); |
| 126 | |
| 127 | result = wait_event_interruptible_timeout(ec->wait, |
| 128 | !ec->expect_event, |
| 129 | msecs_to_jiffies(ACPI_EC_DELAY)); |
| 130 | |
| 131 | ec->expect_event = 0; |
| 132 | smp_mb(); |
| 133 | |
| 134 | if (result < 0){ |
| 135 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR," result = %d ", result)); |
| 136 | return_VALUE(result); |
| 137 | } |
| 138 | |
| 139 | /* |
| 140 | * Verify that the event in question has actually happened by |
| 141 | * querying EC status. Do the check even if operation timed-out |
| 142 | * to make sure that we did not miss interrupt. |
| 143 | */ |
| 144 | switch (event) { |
| 145 | case ACPI_EC_EVENT_OBF: |
| 146 | if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_OBF) |
| 147 | return_VALUE(0); |
| 148 | break; |
| 149 | |
| 150 | case ACPI_EC_EVENT_IBE: |
| 151 | if (~acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) |
| 152 | return_VALUE(0); |
| 153 | break; |
| 154 | } |
| 155 | |
| 156 | return_VALUE(-ETIME); |
| 157 | } |
| 158 | |
| 159 | |
| 160 | |
| 161 | static int |
| 162 | acpi_ec_enter_burst_mode ( |
| 163 | struct acpi_ec *ec) |
| 164 | { |
| 165 | u32 tmp = 0; |
| 166 | int status = 0; |
| 167 | |
| 168 | ACPI_FUNCTION_TRACE("acpi_ec_enter_burst_mode"); |
| 169 | |
| 170 | status = acpi_ec_read_status(ec); |
| 171 | if (status != -EINVAL && |
| 172 | !(status & ACPI_EC_FLAG_BURST)){ |
| 173 | ACPI_DEBUG_PRINT((ACPI_DB_INFO,"entering burst mode \n")); |
| 174 | acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE, &ec->command_addr); |
| 175 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF); |
| 176 | if (status){ |
| 177 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); |
| 178 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR," status = %d\n", status)); |
| 179 | return_VALUE(-EINVAL); |
| 180 | } |
| 181 | acpi_hw_low_level_read(8, &tmp, &ec->data_addr); |
| 182 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); |
| 183 | if(tmp != 0x90 ) {/* Burst ACK byte*/ |
| 184 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR,"Ack failed \n")); |
| 185 | return_VALUE(-EINVAL); |
| 186 | } |
| 187 | } else |
| 188 | ACPI_DEBUG_PRINT((ACPI_DB_INFO,"already be in burst mode \n")); |
| 189 | atomic_set(&ec->leaving_burst , 0); |
| 190 | return_VALUE(0); |
| 191 | } |
| 192 | |
| 193 | static int |
| 194 | acpi_ec_leave_burst_mode ( |
| 195 | struct acpi_ec *ec) |
| 196 | { |
| 197 | int status =0; |
| 198 | |
| 199 | ACPI_FUNCTION_TRACE("acpi_ec_leave_burst_mode"); |
| 200 | |
| 201 | atomic_set(&ec->leaving_burst , 1); |
| 202 | status = acpi_ec_read_status(ec); |
| 203 | if (status != -EINVAL && |
| 204 | (status & ACPI_EC_FLAG_BURST)){ |
| 205 | ACPI_DEBUG_PRINT((ACPI_DB_INFO,"leaving burst mode\n")); |
| 206 | acpi_hw_low_level_write(8, ACPI_EC_BURST_DISABLE, &ec->command_addr); |
| 207 | status = acpi_ec_wait(ec, ACPI_EC_FLAG_IBF); |
| 208 | if (status){ |
| 209 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); |
| 210 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR,"------->wait fail\n")); |
| 211 | return_VALUE(-EINVAL); |
| 212 | } |
| 213 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); |
| 214 | status = acpi_ec_read_status(ec); |
| 215 | if (status != -EINVAL && |
| 216 | (status & ACPI_EC_FLAG_BURST)) { |
| 217 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR,"------->status fail\n")); |
| 218 | return_VALUE(-EINVAL); |
| 219 | } |
| 220 | }else |
| 221 | ACPI_DEBUG_PRINT((ACPI_DB_INFO,"already be in Non-burst mode \n")); |
| 222 | ACPI_DEBUG_PRINT((ACPI_DB_INFO,"leaving burst mode\n")); |
| 223 | |
| 224 | return_VALUE(0); |
| 225 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | |
| 227 | static int |
| 228 | acpi_ec_read ( |
| 229 | struct acpi_ec *ec, |
| 230 | u8 address, |
| 231 | u32 *data) |
| 232 | { |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 233 | int status = 0; |
| 234 | u32 glk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | |
| 236 | ACPI_FUNCTION_TRACE("acpi_ec_read"); |
| 237 | |
| 238 | if (!ec || !data) |
| 239 | return_VALUE(-EINVAL); |
| 240 | |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 241 | retry: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | *data = 0; |
| 243 | |
| 244 | if (ec->global_lock) { |
| 245 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
| 246 | if (ACPI_FAILURE(status)) |
| 247 | return_VALUE(-ENODEV); |
| 248 | } |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 249 | |
| 250 | WARN_ON(in_interrupt()); |
| 251 | down(&ec->sem); |
| 252 | |
| 253 | if(acpi_ec_enter_burst_mode(ec)) |
| 254 | goto end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | |
| 256 | acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ, &ec->command_addr); |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 257 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); |
| 258 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); |
| 259 | if (status) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | goto end; |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 261 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | |
| 263 | acpi_hw_low_level_write(8, address, &ec->data_addr); |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 264 | status= acpi_ec_wait(ec, ACPI_EC_EVENT_OBF); |
| 265 | if (status){ |
| 266 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | goto end; |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 268 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | |
| 270 | acpi_hw_low_level_read(8, data, &ec->data_addr); |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 271 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | |
| 273 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n", |
| 274 | *data, address)); |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 275 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | end: |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 277 | acpi_ec_leave_burst_mode(ec); |
| 278 | up(&ec->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | |
| 280 | if (ec->global_lock) |
| 281 | acpi_release_global_lock(glk); |
| 282 | |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 283 | if(atomic_read(&ec->leaving_burst) == 2){ |
| 284 | ACPI_DEBUG_PRINT((ACPI_DB_INFO,"aborted, retry ...\n")); |
| 285 | while(!atomic_read(&ec->pending_gpe)){ |
| 286 | msleep(1); |
| 287 | } |
| 288 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); |
| 289 | goto retry; |
| 290 | } |
| 291 | |
| 292 | return_VALUE(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | } |
| 294 | |
| 295 | |
| 296 | static int |
| 297 | acpi_ec_write ( |
| 298 | struct acpi_ec *ec, |
| 299 | u8 address, |
| 300 | u8 data) |
| 301 | { |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 302 | int status = 0; |
| 303 | u32 glk; |
| 304 | u32 tmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | |
| 306 | ACPI_FUNCTION_TRACE("acpi_ec_write"); |
| 307 | |
| 308 | if (!ec) |
| 309 | return_VALUE(-EINVAL); |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 310 | retry: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | if (ec->global_lock) { |
| 312 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
| 313 | if (ACPI_FAILURE(status)) |
| 314 | return_VALUE(-ENODEV); |
| 315 | } |
| 316 | |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 317 | WARN_ON(in_interrupt()); |
| 318 | down(&ec->sem); |
| 319 | |
| 320 | if(acpi_ec_enter_burst_mode(ec)) |
| 321 | goto end; |
| 322 | |
| 323 | status = acpi_ec_read_status(ec); |
| 324 | if (status != -EINVAL && |
| 325 | !(status & ACPI_EC_FLAG_BURST)){ |
| 326 | acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE, &ec->command_addr); |
| 327 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF); |
| 328 | if (status) |
| 329 | goto end; |
| 330 | acpi_hw_low_level_read(8, &tmp, &ec->data_addr); |
| 331 | if(tmp != 0x90 ) /* Burst ACK byte*/ |
| 332 | goto end; |
| 333 | } |
| 334 | /*Now we are in burst mode*/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | |
| 336 | acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE, &ec->command_addr); |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 337 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); |
| 338 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); |
| 339 | if (status){ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | goto end; |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 341 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | |
| 343 | acpi_hw_low_level_write(8, address, &ec->data_addr); |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 344 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); |
| 345 | if (status){ |
| 346 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | goto end; |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 348 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | |
| 350 | acpi_hw_low_level_write(8, data, &ec->data_addr); |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 351 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE); |
| 352 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); |
| 353 | if (status) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | goto end; |
| 355 | |
| 356 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n", |
| 357 | data, address)); |
| 358 | |
| 359 | end: |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 360 | acpi_ec_leave_burst_mode(ec); |
| 361 | up(&ec->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | |
| 363 | if (ec->global_lock) |
| 364 | acpi_release_global_lock(glk); |
| 365 | |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 366 | if(atomic_read(&ec->leaving_burst) == 2){ |
| 367 | ACPI_DEBUG_PRINT((ACPI_DB_INFO,"aborted, retry ...\n")); |
| 368 | while(!atomic_read(&ec->pending_gpe)){ |
| 369 | msleep(1); |
| 370 | } |
| 371 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); |
| 372 | goto retry; |
| 373 | } |
| 374 | |
| 375 | return_VALUE(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | } |
| 377 | |
| 378 | /* |
| 379 | * Externally callable EC access functions. For now, assume 1 EC only |
| 380 | */ |
| 381 | int |
| 382 | ec_read(u8 addr, u8 *val) |
| 383 | { |
| 384 | struct acpi_ec *ec; |
| 385 | int err; |
| 386 | u32 temp_data; |
| 387 | |
| 388 | if (!first_ec) |
| 389 | return -ENODEV; |
| 390 | |
| 391 | ec = acpi_driver_data(first_ec); |
| 392 | |
| 393 | err = acpi_ec_read(ec, addr, &temp_data); |
| 394 | |
| 395 | if (!err) { |
| 396 | *val = temp_data; |
| 397 | return 0; |
| 398 | } |
| 399 | else |
| 400 | return err; |
| 401 | } |
| 402 | EXPORT_SYMBOL(ec_read); |
| 403 | |
| 404 | int |
| 405 | ec_write(u8 addr, u8 val) |
| 406 | { |
| 407 | struct acpi_ec *ec; |
| 408 | int err; |
| 409 | |
| 410 | if (!first_ec) |
| 411 | return -ENODEV; |
| 412 | |
| 413 | ec = acpi_driver_data(first_ec); |
| 414 | |
| 415 | err = acpi_ec_write(ec, addr, val); |
| 416 | |
| 417 | return err; |
| 418 | } |
| 419 | EXPORT_SYMBOL(ec_write); |
| 420 | |
| 421 | |
| 422 | static int |
| 423 | acpi_ec_query ( |
| 424 | struct acpi_ec *ec, |
| 425 | u32 *data) |
| 426 | { |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 427 | int status = 0; |
| 428 | u32 glk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | |
| 430 | ACPI_FUNCTION_TRACE("acpi_ec_query"); |
| 431 | |
| 432 | if (!ec || !data) |
| 433 | return_VALUE(-EINVAL); |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 434 | retry: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | *data = 0; |
| 436 | |
| 437 | if (ec->global_lock) { |
| 438 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
| 439 | if (ACPI_FAILURE(status)) |
| 440 | return_VALUE(-ENODEV); |
| 441 | } |
| 442 | |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 443 | down(&ec->sem); |
| 444 | if(acpi_ec_enter_burst_mode(ec)) |
| 445 | goto end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | /* |
| 447 | * Query the EC to find out which _Qxx method we need to evaluate. |
| 448 | * Note that successful completion of the query causes the ACPI_EC_SCI |
| 449 | * bit to be cleared (and thus clearing the interrupt source). |
| 450 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY, &ec->command_addr); |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 452 | status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF); |
| 453 | if (status){ |
| 454 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | goto end; |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 456 | } |
| 457 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | acpi_hw_low_level_read(8, data, &ec->data_addr); |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 459 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | if (!*data) |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 461 | status = -ENODATA; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | |
| 463 | end: |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 464 | acpi_ec_leave_burst_mode(ec); |
| 465 | up(&ec->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | |
| 467 | if (ec->global_lock) |
| 468 | acpi_release_global_lock(glk); |
| 469 | |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 470 | if(atomic_read(&ec->leaving_burst) == 2){ |
| 471 | ACPI_DEBUG_PRINT((ACPI_DB_INFO,"aborted, retry ...\n")); |
| 472 | while(!atomic_read(&ec->pending_gpe)){ |
| 473 | msleep(1); |
| 474 | } |
| 475 | acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR); |
| 476 | goto retry; |
| 477 | } |
| 478 | |
| 479 | return_VALUE(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | } |
| 481 | |
| 482 | |
| 483 | /* -------------------------------------------------------------------------- |
| 484 | Event Management |
| 485 | -------------------------------------------------------------------------- */ |
| 486 | |
| 487 | struct acpi_ec_query_data { |
| 488 | acpi_handle handle; |
| 489 | u8 data; |
| 490 | }; |
| 491 | |
| 492 | static void |
| 493 | acpi_ec_gpe_query ( |
| 494 | void *ec_cxt) |
| 495 | { |
| 496 | struct acpi_ec *ec = (struct acpi_ec *) ec_cxt; |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 497 | u32 value; |
| 498 | int result = -ENODATA; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | static char object_name[5] = {'_','Q','0','0','\0'}; |
| 500 | const char hex[] = {'0','1','2','3','4','5','6','7', |
| 501 | '8','9','A','B','C','D','E','F'}; |
| 502 | |
| 503 | ACPI_FUNCTION_TRACE("acpi_ec_gpe_query"); |
| 504 | |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 505 | if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI) |
| 506 | result = acpi_ec_query(ec, &value); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 508 | if (result) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | goto end; |
| 510 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | object_name[2] = hex[((value >> 4) & 0x0F)]; |
| 512 | object_name[3] = hex[(value & 0x0F)]; |
| 513 | |
| 514 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name)); |
| 515 | |
| 516 | acpi_evaluate_object(ec->handle, object_name, NULL, NULL); |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 517 | atomic_dec(&ec->pending_gpe); |
| 518 | end: |
| 519 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | } |
| 521 | |
| 522 | static u32 |
| 523 | acpi_ec_gpe_handler ( |
| 524 | void *data) |
| 525 | { |
| 526 | acpi_status status = AE_OK; |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 527 | u32 value; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | struct acpi_ec *ec = (struct acpi_ec *) data; |
| 529 | |
| 530 | if (!ec) |
| 531 | return ACPI_INTERRUPT_NOT_HANDLED; |
| 532 | |
| 533 | acpi_disable_gpe(NULL, ec->gpe_bit, ACPI_ISR); |
| 534 | |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 535 | value = acpi_ec_read_status(ec); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 537 | if((value & ACPI_EC_FLAG_IBF) && |
| 538 | !(value & ACPI_EC_FLAG_BURST) && |
| 539 | (atomic_read(&ec->leaving_burst) == 0)) { |
| 540 | /* |
| 541 | * the embedded controller disables |
| 542 | * burst mode for any reason other |
| 543 | * than the burst disable command |
| 544 | * to process critical event. |
| 545 | */ |
| 546 | atomic_set(&ec->leaving_burst , 2); /* block current pending transaction |
| 547 | and retry */ |
| 548 | wake_up(&ec->wait); |
| 549 | }else { |
| 550 | if ((ec->expect_event == ACPI_EC_EVENT_OBF && |
| 551 | (value & ACPI_EC_FLAG_OBF)) || |
| 552 | (ec->expect_event == ACPI_EC_EVENT_IBE && |
| 553 | !(value & ACPI_EC_FLAG_IBF))) { |
| 554 | ec->expect_event = 0; |
| 555 | wake_up(&ec->wait); |
| 556 | |
| 557 | } |
| 558 | } |
| 559 | |
| 560 | if (value & ACPI_EC_FLAG_SCI){ |
| 561 | atomic_add(1, &ec->pending_gpe) ; |
| 562 | status = acpi_os_queue_for_execution(OSD_PRIORITY_GPE, |
| 563 | acpi_ec_gpe_query, ec); |
| 564 | } |
| 565 | |
| 566 | return status == AE_OK ? |
| 567 | ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | } |
| 569 | |
| 570 | /* -------------------------------------------------------------------------- |
| 571 | Address Space Management |
| 572 | -------------------------------------------------------------------------- */ |
| 573 | |
| 574 | static acpi_status |
| 575 | acpi_ec_space_setup ( |
| 576 | acpi_handle region_handle, |
| 577 | u32 function, |
| 578 | void *handler_context, |
| 579 | void **return_context) |
| 580 | { |
| 581 | /* |
| 582 | * The EC object is in the handler context and is needed |
| 583 | * when calling the acpi_ec_space_handler. |
| 584 | */ |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 585 | *return_context = (function != ACPI_REGION_DEACTIVATE) ? |
| 586 | handler_context : NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | |
| 588 | return AE_OK; |
| 589 | } |
| 590 | |
| 591 | |
| 592 | static acpi_status |
| 593 | acpi_ec_space_handler ( |
| 594 | u32 function, |
| 595 | acpi_physical_address address, |
| 596 | u32 bit_width, |
| 597 | acpi_integer *value, |
| 598 | void *handler_context, |
| 599 | void *region_context) |
| 600 | { |
| 601 | int result = 0; |
| 602 | struct acpi_ec *ec = NULL; |
| 603 | u32 temp = 0; |
| 604 | acpi_integer f_v = 0; |
| 605 | int i = 0; |
| 606 | |
| 607 | ACPI_FUNCTION_TRACE("acpi_ec_space_handler"); |
| 608 | |
| 609 | if ((address > 0xFF) || !value || !handler_context) |
| 610 | return_VALUE(AE_BAD_PARAMETER); |
| 611 | |
| 612 | if(bit_width != 8) { |
| 613 | printk(KERN_WARNING PREFIX "acpi_ec_space_handler: bit_width should be 8\n"); |
| 614 | if (acpi_strict) |
| 615 | return_VALUE(AE_BAD_PARAMETER); |
| 616 | } |
| 617 | |
| 618 | ec = (struct acpi_ec *) handler_context; |
| 619 | |
| 620 | next_byte: |
| 621 | switch (function) { |
| 622 | case ACPI_READ: |
| 623 | result = acpi_ec_read(ec, (u8) address, &temp); |
| 624 | *value = (acpi_integer) temp; |
| 625 | break; |
| 626 | case ACPI_WRITE: |
| 627 | result = acpi_ec_write(ec, (u8) address, (u8) *value); |
| 628 | break; |
| 629 | default: |
| 630 | result = -EINVAL; |
| 631 | goto out; |
| 632 | break; |
| 633 | } |
| 634 | |
| 635 | bit_width -= 8; |
| 636 | if(bit_width){ |
| 637 | |
| 638 | if(function == ACPI_READ) |
| 639 | f_v |= (acpi_integer) (*value) << 8*i; |
| 640 | if(function == ACPI_WRITE) |
| 641 | (*value) >>=8; |
| 642 | i++; |
| 643 | goto next_byte; |
| 644 | } |
| 645 | |
| 646 | |
| 647 | if(function == ACPI_READ){ |
| 648 | f_v |= (acpi_integer) (*value) << 8*i; |
| 649 | *value = f_v; |
| 650 | } |
| 651 | |
| 652 | |
| 653 | out: |
| 654 | switch (result) { |
| 655 | case -EINVAL: |
| 656 | return_VALUE(AE_BAD_PARAMETER); |
| 657 | break; |
| 658 | case -ENODEV: |
| 659 | return_VALUE(AE_NOT_FOUND); |
| 660 | break; |
| 661 | case -ETIME: |
| 662 | return_VALUE(AE_TIME); |
| 663 | break; |
| 664 | default: |
| 665 | return_VALUE(AE_OK); |
| 666 | } |
| 667 | |
| 668 | |
| 669 | } |
| 670 | |
| 671 | |
| 672 | /* -------------------------------------------------------------------------- |
| 673 | FS Interface (/proc) |
| 674 | -------------------------------------------------------------------------- */ |
| 675 | |
| 676 | static struct proc_dir_entry *acpi_ec_dir; |
| 677 | |
| 678 | |
| 679 | static int |
| 680 | acpi_ec_read_info (struct seq_file *seq, void *offset) |
| 681 | { |
| 682 | struct acpi_ec *ec = (struct acpi_ec *) seq->private; |
| 683 | |
| 684 | ACPI_FUNCTION_TRACE("acpi_ec_read_info"); |
| 685 | |
| 686 | if (!ec) |
| 687 | goto end; |
| 688 | |
| 689 | seq_printf(seq, "gpe bit: 0x%02x\n", |
| 690 | (u32) ec->gpe_bit); |
| 691 | seq_printf(seq, "ports: 0x%02x, 0x%02x\n", |
| 692 | (u32) ec->status_addr.address, (u32) ec->data_addr.address); |
| 693 | seq_printf(seq, "use global lock: %s\n", |
| 694 | ec->global_lock?"yes":"no"); |
| 695 | |
| 696 | end: |
| 697 | return_VALUE(0); |
| 698 | } |
| 699 | |
| 700 | static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) |
| 701 | { |
| 702 | return single_open(file, acpi_ec_read_info, PDE(inode)->data); |
| 703 | } |
| 704 | |
| 705 | static struct file_operations acpi_ec_info_ops = { |
| 706 | .open = acpi_ec_info_open_fs, |
| 707 | .read = seq_read, |
| 708 | .llseek = seq_lseek, |
| 709 | .release = single_release, |
| 710 | .owner = THIS_MODULE, |
| 711 | }; |
| 712 | |
| 713 | static int |
| 714 | acpi_ec_add_fs ( |
| 715 | struct acpi_device *device) |
| 716 | { |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 717 | struct proc_dir_entry *entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | |
| 719 | ACPI_FUNCTION_TRACE("acpi_ec_add_fs"); |
| 720 | |
| 721 | if (!acpi_device_dir(device)) { |
| 722 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), |
| 723 | acpi_ec_dir); |
| 724 | if (!acpi_device_dir(device)) |
| 725 | return_VALUE(-ENODEV); |
| 726 | } |
| 727 | |
| 728 | entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO, |
| 729 | acpi_device_dir(device)); |
| 730 | if (!entry) |
| 731 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, |
| 732 | "Unable to create '%s' fs entry\n", |
| 733 | ACPI_EC_FILE_INFO)); |
| 734 | else { |
| 735 | entry->proc_fops = &acpi_ec_info_ops; |
| 736 | entry->data = acpi_driver_data(device); |
| 737 | entry->owner = THIS_MODULE; |
| 738 | } |
| 739 | |
| 740 | return_VALUE(0); |
| 741 | } |
| 742 | |
| 743 | |
| 744 | static int |
| 745 | acpi_ec_remove_fs ( |
| 746 | struct acpi_device *device) |
| 747 | { |
| 748 | ACPI_FUNCTION_TRACE("acpi_ec_remove_fs"); |
| 749 | |
| 750 | if (acpi_device_dir(device)) { |
| 751 | remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); |
| 752 | remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); |
| 753 | acpi_device_dir(device) = NULL; |
| 754 | } |
| 755 | |
| 756 | return_VALUE(0); |
| 757 | } |
| 758 | |
| 759 | |
| 760 | /* -------------------------------------------------------------------------- |
| 761 | Driver Interface |
| 762 | -------------------------------------------------------------------------- */ |
| 763 | |
| 764 | static int |
| 765 | acpi_ec_add ( |
| 766 | struct acpi_device *device) |
| 767 | { |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 768 | int result; |
| 769 | acpi_status status; |
| 770 | struct acpi_ec *ec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | unsigned long uid; |
| 772 | |
| 773 | ACPI_FUNCTION_TRACE("acpi_ec_add"); |
| 774 | |
| 775 | if (!device) |
| 776 | return_VALUE(-EINVAL); |
| 777 | |
| 778 | ec = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
| 779 | if (!ec) |
| 780 | return_VALUE(-ENOMEM); |
| 781 | memset(ec, 0, sizeof(struct acpi_ec)); |
| 782 | |
| 783 | ec->handle = device->handle; |
| 784 | ec->uid = -1; |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 785 | atomic_set(&ec->pending_gpe, 0); |
| 786 | atomic_set(&ec->leaving_burst , 1); |
| 787 | init_MUTEX(&ec->sem); |
| 788 | init_waitqueue_head(&ec->wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
| 790 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); |
| 791 | acpi_driver_data(device) = ec; |
| 792 | |
| 793 | /* Use the global lock for all EC transactions? */ |
| 794 | acpi_evaluate_integer(ec->handle, "_GLK", NULL, &ec->global_lock); |
| 795 | |
| 796 | /* If our UID matches the UID for the ECDT-enumerated EC, |
| 797 | we now have the *real* EC info, so kill the makeshift one.*/ |
| 798 | acpi_evaluate_integer(ec->handle, "_UID", NULL, &uid); |
| 799 | if (ec_ecdt && ec_ecdt->uid == uid) { |
| 800 | acpi_remove_address_space_handler(ACPI_ROOT_OBJECT, |
| 801 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler); |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 802 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | acpi_remove_gpe_handler(NULL, ec_ecdt->gpe_bit, &acpi_ec_gpe_handler); |
| 804 | |
| 805 | kfree(ec_ecdt); |
| 806 | } |
| 807 | |
| 808 | /* Get GPE bit assignment (EC events). */ |
| 809 | /* TODO: Add support for _GPE returning a package */ |
| 810 | status = acpi_evaluate_integer(ec->handle, "_GPE", NULL, &ec->gpe_bit); |
| 811 | if (ACPI_FAILURE(status)) { |
| 812 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
| 813 | "Error obtaining GPE bit assignment\n")); |
| 814 | result = -ENODEV; |
| 815 | goto end; |
| 816 | } |
| 817 | |
| 818 | result = acpi_ec_add_fs(device); |
| 819 | if (result) |
| 820 | goto end; |
| 821 | |
| 822 | printk(KERN_INFO PREFIX "%s [%s] (gpe %d)\n", |
| 823 | acpi_device_name(device), acpi_device_bid(device), |
| 824 | (u32) ec->gpe_bit); |
| 825 | |
| 826 | if (!first_ec) |
| 827 | first_ec = device; |
| 828 | |
| 829 | end: |
| 830 | if (result) |
| 831 | kfree(ec); |
| 832 | |
| 833 | return_VALUE(result); |
| 834 | } |
| 835 | |
| 836 | |
| 837 | static int |
| 838 | acpi_ec_remove ( |
| 839 | struct acpi_device *device, |
| 840 | int type) |
| 841 | { |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 842 | struct acpi_ec *ec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | |
| 844 | ACPI_FUNCTION_TRACE("acpi_ec_remove"); |
| 845 | |
| 846 | if (!device) |
| 847 | return_VALUE(-EINVAL); |
| 848 | |
| 849 | ec = acpi_driver_data(device); |
| 850 | |
| 851 | acpi_ec_remove_fs(device); |
| 852 | |
| 853 | kfree(ec); |
| 854 | |
| 855 | return_VALUE(0); |
| 856 | } |
| 857 | |
| 858 | |
| 859 | static acpi_status |
| 860 | acpi_ec_io_ports ( |
| 861 | struct acpi_resource *resource, |
| 862 | void *context) |
| 863 | { |
| 864 | struct acpi_ec *ec = (struct acpi_ec *) context; |
| 865 | struct acpi_generic_address *addr; |
| 866 | |
| 867 | if (resource->id != ACPI_RSTYPE_IO) { |
| 868 | return AE_OK; |
| 869 | } |
| 870 | |
| 871 | /* |
| 872 | * The first address region returned is the data port, and |
| 873 | * the second address region returned is the status/command |
| 874 | * port. |
| 875 | */ |
| 876 | if (ec->data_addr.register_bit_width == 0) { |
| 877 | addr = &ec->data_addr; |
| 878 | } else if (ec->command_addr.register_bit_width == 0) { |
| 879 | addr = &ec->command_addr; |
| 880 | } else { |
| 881 | return AE_CTRL_TERMINATE; |
| 882 | } |
| 883 | |
| 884 | addr->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO; |
| 885 | addr->register_bit_width = 8; |
| 886 | addr->register_bit_offset = 0; |
| 887 | addr->address = resource->data.io.min_base_address; |
| 888 | |
| 889 | return AE_OK; |
| 890 | } |
| 891 | |
| 892 | |
| 893 | static int |
| 894 | acpi_ec_start ( |
| 895 | struct acpi_device *device) |
| 896 | { |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 897 | acpi_status status; |
| 898 | struct acpi_ec *ec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | |
| 900 | ACPI_FUNCTION_TRACE("acpi_ec_start"); |
| 901 | |
| 902 | if (!device) |
| 903 | return_VALUE(-EINVAL); |
| 904 | |
| 905 | ec = acpi_driver_data(device); |
| 906 | |
| 907 | if (!ec) |
| 908 | return_VALUE(-EINVAL); |
| 909 | |
| 910 | /* |
| 911 | * Get I/O port addresses. Convert to GAS format. |
| 912 | */ |
| 913 | status = acpi_walk_resources(ec->handle, METHOD_NAME__CRS, |
| 914 | acpi_ec_io_ports, ec); |
| 915 | if (ACPI_FAILURE(status) || ec->command_addr.register_bit_width == 0) { |
| 916 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error getting I/O port addresses")); |
| 917 | return_VALUE(-ENODEV); |
| 918 | } |
| 919 | |
| 920 | ec->status_addr = ec->command_addr; |
| 921 | |
| 922 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02x, ports=0x%2x,0x%2x\n", |
| 923 | (u32) ec->gpe_bit, (u32) ec->command_addr.address, |
| 924 | (u32) ec->data_addr.address)); |
| 925 | |
| 926 | /* |
| 927 | * Install GPE handler |
| 928 | */ |
| 929 | status = acpi_install_gpe_handler(NULL, ec->gpe_bit, |
| 930 | ACPI_GPE_EDGE_TRIGGERED, &acpi_ec_gpe_handler, ec); |
| 931 | if (ACPI_FAILURE(status)) { |
| 932 | return_VALUE(-ENODEV); |
| 933 | } |
| 934 | acpi_set_gpe_type (NULL, ec->gpe_bit, ACPI_GPE_TYPE_RUNTIME); |
| 935 | acpi_enable_gpe (NULL, ec->gpe_bit, ACPI_NOT_ISR); |
| 936 | |
| 937 | status = acpi_install_address_space_handler (ec->handle, |
| 938 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler, |
| 939 | &acpi_ec_space_setup, ec); |
| 940 | if (ACPI_FAILURE(status)) { |
| 941 | acpi_remove_gpe_handler(NULL, ec->gpe_bit, &acpi_ec_gpe_handler); |
| 942 | return_VALUE(-ENODEV); |
| 943 | } |
| 944 | |
| 945 | return_VALUE(AE_OK); |
| 946 | } |
| 947 | |
| 948 | |
| 949 | static int |
| 950 | acpi_ec_stop ( |
| 951 | struct acpi_device *device, |
| 952 | int type) |
| 953 | { |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 954 | acpi_status status; |
| 955 | struct acpi_ec *ec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | |
| 957 | ACPI_FUNCTION_TRACE("acpi_ec_stop"); |
| 958 | |
| 959 | if (!device) |
| 960 | return_VALUE(-EINVAL); |
| 961 | |
| 962 | ec = acpi_driver_data(device); |
| 963 | |
| 964 | status = acpi_remove_address_space_handler(ec->handle, |
| 965 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler); |
| 966 | if (ACPI_FAILURE(status)) |
| 967 | return_VALUE(-ENODEV); |
| 968 | |
| 969 | status = acpi_remove_gpe_handler(NULL, ec->gpe_bit, &acpi_ec_gpe_handler); |
| 970 | if (ACPI_FAILURE(status)) |
| 971 | return_VALUE(-ENODEV); |
| 972 | |
| 973 | return_VALUE(0); |
| 974 | } |
| 975 | |
| 976 | static acpi_status __init |
| 977 | acpi_fake_ecdt_callback ( |
| 978 | acpi_handle handle, |
| 979 | u32 Level, |
| 980 | void *context, |
| 981 | void **retval) |
| 982 | { |
| 983 | acpi_status status; |
| 984 | |
| 985 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
| 986 | acpi_ec_io_ports, ec_ecdt); |
| 987 | if (ACPI_FAILURE(status)) |
| 988 | return status; |
| 989 | ec_ecdt->status_addr = ec_ecdt->command_addr; |
| 990 | |
| 991 | ec_ecdt->uid = -1; |
| 992 | acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->uid); |
| 993 | |
| 994 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec_ecdt->gpe_bit); |
| 995 | if (ACPI_FAILURE(status)) |
| 996 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | ec_ecdt->global_lock = TRUE; |
| 998 | ec_ecdt->handle = handle; |
| 999 | |
| 1000 | printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n", |
| 1001 | (u32) ec_ecdt->gpe_bit, (u32) ec_ecdt->command_addr.address, |
| 1002 | (u32) ec_ecdt->data_addr.address); |
| 1003 | |
| 1004 | return AE_CTRL_TERMINATE; |
| 1005 | } |
| 1006 | |
| 1007 | /* |
| 1008 | * Some BIOS (such as some from Gateway laptops) access EC region very early |
| 1009 | * such as in BAT0._INI or EC._INI before an EC device is found and |
| 1010 | * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily |
| 1011 | * required, but if EC regison is accessed early, it is required. |
| 1012 | * The routine tries to workaround the BIOS bug by pre-scan EC device |
| 1013 | * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any |
| 1014 | * op region (since _REG isn't invoked yet). The assumption is true for |
| 1015 | * all systems found. |
| 1016 | */ |
| 1017 | static int __init |
| 1018 | acpi_ec_fake_ecdt(void) |
| 1019 | { |
| 1020 | acpi_status status; |
| 1021 | int ret = 0; |
| 1022 | |
| 1023 | printk(KERN_INFO PREFIX "Try to make an fake ECDT\n"); |
| 1024 | |
| 1025 | ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
| 1026 | if (!ec_ecdt) { |
| 1027 | ret = -ENOMEM; |
| 1028 | goto error; |
| 1029 | } |
| 1030 | memset(ec_ecdt, 0, sizeof(struct acpi_ec)); |
| 1031 | |
| 1032 | status = acpi_get_devices (ACPI_EC_HID, |
| 1033 | acpi_fake_ecdt_callback, |
| 1034 | NULL, |
| 1035 | NULL); |
| 1036 | if (ACPI_FAILURE(status)) { |
| 1037 | kfree(ec_ecdt); |
| 1038 | ec_ecdt = NULL; |
| 1039 | ret = -ENODEV; |
| 1040 | goto error; |
| 1041 | } |
| 1042 | return 0; |
| 1043 | error: |
| 1044 | printk(KERN_ERR PREFIX "Can't make an fake ECDT\n"); |
| 1045 | return ret; |
| 1046 | } |
| 1047 | |
| 1048 | static int __init |
| 1049 | acpi_ec_get_real_ecdt(void) |
| 1050 | { |
| 1051 | acpi_status status; |
| 1052 | struct acpi_table_ecdt *ecdt_ptr; |
| 1053 | |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 1054 | status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1055 | (struct acpi_table_header **) &ecdt_ptr); |
| 1056 | if (ACPI_FAILURE(status)) |
| 1057 | return -ENODEV; |
| 1058 | |
| 1059 | printk(KERN_INFO PREFIX "Found ECDT\n"); |
| 1060 | |
| 1061 | /* |
| 1062 | * Generate a temporary ec context to use until the namespace is scanned |
| 1063 | */ |
| 1064 | ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
| 1065 | if (!ec_ecdt) |
| 1066 | return -ENOMEM; |
| 1067 | memset(ec_ecdt, 0, sizeof(struct acpi_ec)); |
| 1068 | |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 1069 | init_MUTEX(&ec_ecdt->sem); |
| 1070 | init_waitqueue_head(&ec_ecdt->wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1071 | ec_ecdt->command_addr = ecdt_ptr->ec_control; |
| 1072 | ec_ecdt->status_addr = ecdt_ptr->ec_control; |
| 1073 | ec_ecdt->data_addr = ecdt_ptr->ec_data; |
| 1074 | ec_ecdt->gpe_bit = ecdt_ptr->gpe_bit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1075 | /* use the GL just to be safe */ |
| 1076 | ec_ecdt->global_lock = TRUE; |
| 1077 | ec_ecdt->uid = ecdt_ptr->uid; |
| 1078 | |
| 1079 | status = acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->handle); |
| 1080 | if (ACPI_FAILURE(status)) { |
| 1081 | goto error; |
| 1082 | } |
| 1083 | |
| 1084 | return 0; |
| 1085 | error: |
| 1086 | printk(KERN_ERR PREFIX "Could not use ECDT\n"); |
| 1087 | kfree(ec_ecdt); |
| 1088 | ec_ecdt = NULL; |
| 1089 | |
| 1090 | return -ENODEV; |
| 1091 | } |
| 1092 | |
| 1093 | static int __initdata acpi_fake_ecdt_enabled; |
| 1094 | int __init |
| 1095 | acpi_ec_ecdt_probe (void) |
| 1096 | { |
| 1097 | acpi_status status; |
| 1098 | int ret; |
| 1099 | |
| 1100 | ret = acpi_ec_get_real_ecdt(); |
| 1101 | /* Try to make a fake ECDT */ |
| 1102 | if (ret && acpi_fake_ecdt_enabled) { |
| 1103 | ret = acpi_ec_fake_ecdt(); |
| 1104 | } |
| 1105 | |
| 1106 | if (ret) |
| 1107 | return 0; |
| 1108 | |
| 1109 | /* |
| 1110 | * Install GPE handler |
| 1111 | */ |
| 1112 | status = acpi_install_gpe_handler(NULL, ec_ecdt->gpe_bit, |
| 1113 | ACPI_GPE_EDGE_TRIGGERED, &acpi_ec_gpe_handler, |
| 1114 | ec_ecdt); |
| 1115 | if (ACPI_FAILURE(status)) { |
| 1116 | goto error; |
| 1117 | } |
| 1118 | acpi_set_gpe_type (NULL, ec_ecdt->gpe_bit, ACPI_GPE_TYPE_RUNTIME); |
| 1119 | acpi_enable_gpe (NULL, ec_ecdt->gpe_bit, ACPI_NOT_ISR); |
| 1120 | |
| 1121 | status = acpi_install_address_space_handler (ACPI_ROOT_OBJECT, |
| 1122 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler, |
| 1123 | &acpi_ec_space_setup, ec_ecdt); |
| 1124 | if (ACPI_FAILURE(status)) { |
| 1125 | acpi_remove_gpe_handler(NULL, ec_ecdt->gpe_bit, |
| 1126 | &acpi_ec_gpe_handler); |
| 1127 | goto error; |
| 1128 | } |
| 1129 | |
| 1130 | return 0; |
| 1131 | |
| 1132 | error: |
| 1133 | printk(KERN_ERR PREFIX "Could not use ECDT\n"); |
| 1134 | kfree(ec_ecdt); |
| 1135 | ec_ecdt = NULL; |
| 1136 | |
| 1137 | return -ENODEV; |
| 1138 | } |
| 1139 | |
| 1140 | |
| 1141 | static int __init acpi_ec_init (void) |
| 1142 | { |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame^] | 1143 | int result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1144 | |
| 1145 | ACPI_FUNCTION_TRACE("acpi_ec_init"); |
| 1146 | |
| 1147 | if (acpi_disabled) |
| 1148 | return_VALUE(0); |
| 1149 | |
| 1150 | acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); |
| 1151 | if (!acpi_ec_dir) |
| 1152 | return_VALUE(-ENODEV); |
| 1153 | |
| 1154 | /* Now register the driver for the EC */ |
| 1155 | result = acpi_bus_register_driver(&acpi_ec_driver); |
| 1156 | if (result < 0) { |
| 1157 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); |
| 1158 | return_VALUE(-ENODEV); |
| 1159 | } |
| 1160 | |
| 1161 | return_VALUE(result); |
| 1162 | } |
| 1163 | |
| 1164 | subsys_initcall(acpi_ec_init); |
| 1165 | |
| 1166 | /* EC driver currently not unloadable */ |
| 1167 | #if 0 |
| 1168 | static void __exit |
| 1169 | acpi_ec_exit (void) |
| 1170 | { |
| 1171 | ACPI_FUNCTION_TRACE("acpi_ec_exit"); |
| 1172 | |
| 1173 | acpi_bus_unregister_driver(&acpi_ec_driver); |
| 1174 | |
| 1175 | remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); |
| 1176 | |
| 1177 | return_VOID; |
| 1178 | } |
| 1179 | #endif /* 0 */ |
| 1180 | |
| 1181 | static int __init acpi_fake_ecdt_setup(char *str) |
| 1182 | { |
| 1183 | acpi_fake_ecdt_enabled = 1; |
| 1184 | return 0; |
| 1185 | } |
| 1186 | __setup("acpi_fake_ecdt", acpi_fake_ecdt_setup); |