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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +04002 * ec.c - ACPI Embedded Controller Driver (v2.1)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +04004 * Copyright (C) 2006-2008 Alexey Starikovskiy <astarikovskiy@suse.de>
Alexey Starikovskiy01f22462007-03-07 22:28:00 +03005 * Copyright (C) 2006 Denis Sadykov <denis.m.sadykov@intel.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 * 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
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +040029/* Uncomment next line to get verbose printout */
Márton Némethd772b3b2008-01-23 22:34:09 -050030/* #define DEBUG */
31
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include <linux/kernel.h>
33#include <linux/module.h>
34#include <linux/init.h>
35#include <linux/types.h>
36#include <linux/delay.h>
Dmitry Torokhov451566f2005-03-19 01:10:05 -050037#include <linux/interrupt.h>
Alexey Starikovskiy837012e2007-05-29 16:43:02 +040038#include <linux/list.h>
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +040039#include <linux/spinlock.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090040#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include <asm/io.h>
42#include <acpi/acpi_bus.h>
43#include <acpi/acpi_drivers.h>
Len Browneb27cae2009-07-06 23:40:19 -040044#include <linux/dmi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
Thomas Renninger1195a092010-07-16 13:11:31 +020046#include "internal.h"
47
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#define ACPI_EC_CLASS "embedded_controller"
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#define ACPI_EC_DEVICE_NAME "Embedded Controller"
50#define ACPI_EC_FILE_INFO "info"
Alexey Starikovskiy837012e2007-05-29 16:43:02 +040051
Thomas Renninger1195a092010-07-16 13:11:31 +020052#undef PREFIX
Alexey Starikovskiyaf3fd142006-12-07 18:42:16 +030053#define PREFIX "ACPI: EC: "
Alexey Starikovskiy43509332007-05-29 16:42:57 +040054
Denis M. Sadykov703959d2006-09-26 19:50:33 +040055/* EC status register */
Linus Torvalds1da177e2005-04-16 15:20:36 -070056#define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */
57#define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */
Dmitry Torokhov451566f2005-03-19 01:10:05 -050058#define ACPI_EC_FLAG_BURST 0x10 /* burst mode */
Linus Torvalds1da177e2005-04-16 15:20:36 -070059#define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */
Alexey Starikovskiy43509332007-05-29 16:42:57 +040060
Denis M. Sadykov703959d2006-09-26 19:50:33 +040061/* EC commands */
Alexey Starikovskiy3261ff42006-12-07 18:42:17 +030062enum ec_command {
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +030063 ACPI_EC_COMMAND_READ = 0x80,
64 ACPI_EC_COMMAND_WRITE = 0x81,
65 ACPI_EC_BURST_ENABLE = 0x82,
66 ACPI_EC_BURST_DISABLE = 0x83,
67 ACPI_EC_COMMAND_QUERY = 0x84,
Alexey Starikovskiy3261ff42006-12-07 18:42:17 +030068};
Alexey Starikovskiy837012e2007-05-29 16:43:02 +040069
Alexey Starikovskiy5c406412006-12-07 18:42:16 +030070#define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */
Denis M. Sadykov703959d2006-09-26 19:50:33 +040071#define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +040072#define ACPI_EC_MSI_UDELAY 550 /* Wait 550us for MSI EC */
Denis M. Sadykov703959d2006-09-26 19:50:33 +040073
Alexey Starikovskiy06cf7d32008-11-09 19:01:06 +030074#define ACPI_EC_STORM_THRESHOLD 8 /* number of false interrupts
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +040075 per one transaction */
76
Alexey Starikovskiy080e4122007-10-22 14:18:30 +040077enum {
Alexey Starikovskiy080e4122007-10-22 14:18:30 +040078 EC_FLAGS_QUERY_PENDING, /* Query is pending */
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +040079 EC_FLAGS_GPE_STORM, /* GPE storm detected */
Rafael J. Wysockif6bb13a2010-03-04 01:52:58 +010080 EC_FLAGS_HANDLERS_INSTALLED, /* Handlers for GPE and
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +040081 * OpReg are installed */
Rafael J. Wysockife955682010-04-09 01:40:38 +020082 EC_FLAGS_BLOCKED, /* Transactions are blocked */
Linus Torvalds1da177e2005-04-16 15:20:36 -070083};
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +040084
Thomas Renninger7a18e962010-10-21 18:24:57 +020085/* ec.c is compiled in acpi namespace so this shows up as acpi.ec_delay param */
86static unsigned int ec_delay __read_mostly = ACPI_EC_DELAY;
87module_param(ec_delay, uint, 0644);
88MODULE_PARM_DESC(ec_delay, "Timeout(ms) waited until an EC command completes");
89
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +040090/* If we find an EC via the ECDT, we need to keep a ptr to its context */
Alexey Starikovskiyd0338792007-03-07 22:28:00 +030091/* External interfaces use first EC only, so remember */
Alexey Starikovskiy837012e2007-05-29 16:43:02 +040092typedef int (*acpi_ec_query_func) (void *data);
93
94struct acpi_ec_query_handler {
95 struct list_head node;
96 acpi_ec_query_func func;
97 acpi_handle handle;
98 void *data;
99 u8 query_bit;
100};
101
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400102struct transaction {
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400103 const u8 *wdata;
104 u8 *rdata;
105 unsigned short irq_count;
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400106 u8 command;
Alexey Starikovskiya2f93ae2008-11-12 01:40:19 +0300107 u8 wi;
108 u8 ri;
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400109 u8 wlen;
110 u8 rlen;
Alexey Starikovskiydd15f8c2008-11-08 21:42:30 +0300111 bool done;
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400112};
113
Thomas Renninger1195a092010-07-16 13:11:31 +0200114struct acpi_ec *boot_ec, *first_ec;
115EXPORT_SYMBOL(first_ec);
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400116
Alexey Starikovskiy5423a0c2009-02-21 12:18:13 -0500117static int EC_FLAGS_MSI; /* Out-of-spec MSI controller */
Alexey Starikovskiy0adf3c72009-10-02 20:21:33 +0400118static int EC_FLAGS_VALIDATE_ECDT; /* ASUStec ECDTs need to be validated */
Alexey Starikovskiy478fa032009-10-02 20:21:40 +0400119static int EC_FLAGS_SKIP_DSDT_SCAN; /* Not all BIOS survive early DSDT scan */
Alexey Starikovskiy5423a0c2009-02-21 12:18:13 -0500120
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121/* --------------------------------------------------------------------------
122 Transaction Management
123 -------------------------------------------------------------------------- */
124
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400125static inline u8 acpi_ec_read_status(struct acpi_ec *ec)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126{
Márton Németh3ebe08a2007-11-21 03:23:26 +0300127 u8 x = inb(ec->command_addr);
Márton Németh86dae012008-01-23 22:33:06 -0500128 pr_debug(PREFIX "---> status = 0x%2.2x\n", x);
Márton Németh3ebe08a2007-11-21 03:23:26 +0300129 return x;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130}
131
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400132static inline u8 acpi_ec_read_data(struct acpi_ec *ec)
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400133{
Márton Németh3ebe08a2007-11-21 03:23:26 +0300134 u8 x = inb(ec->data_addr);
Márton Németh86dae012008-01-23 22:33:06 -0500135 pr_debug(PREFIX "---> data = 0x%2.2x\n", x);
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400136 return x;
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400137}
138
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400139static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command)
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400140{
Márton Németh86dae012008-01-23 22:33:06 -0500141 pr_debug(PREFIX "<--- command = 0x%2.2x\n", command);
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400142 outb(command, ec->command_addr);
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400143}
144
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400145static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data)
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400146{
Márton Németh86dae012008-01-23 22:33:06 -0500147 pr_debug(PREFIX "<--- data = 0x%2.2x\n", data);
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400148 outb(data, ec->data_addr);
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400149}
150
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400151static int ec_transaction_done(struct acpi_ec *ec)
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400152{
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400153 unsigned long flags;
154 int ret = 0;
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400155 spin_lock_irqsave(&ec->curr_lock, flags);
Alexey Starikovskiydd15f8c2008-11-08 21:42:30 +0300156 if (!ec->curr || ec->curr->done)
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400157 ret = 1;
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400158 spin_unlock_irqrestore(&ec->curr_lock, flags);
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400159 return ret;
160}
Denis M. Sadykov7c6db5e2006-09-26 19:50:33 +0400161
Alexey Starikovskiya2f93ae2008-11-12 01:40:19 +0300162static void start_transaction(struct acpi_ec *ec)
163{
164 ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0;
165 ec->curr->done = false;
166 acpi_ec_write_cmd(ec, ec->curr->command);
167}
168
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400169static void advance_transaction(struct acpi_ec *ec, u8 status)
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400170{
171 unsigned long flags;
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400172 spin_lock_irqsave(&ec->curr_lock, flags);
173 if (!ec->curr)
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400174 goto unlock;
Alexey Starikovskiya2f93ae2008-11-12 01:40:19 +0300175 if (ec->curr->wlen > ec->curr->wi) {
176 if ((status & ACPI_EC_FLAG_IBF) == 0)
177 acpi_ec_write_data(ec,
178 ec->curr->wdata[ec->curr->wi++]);
179 else
Alexey Starikovskiydd15f8c2008-11-08 21:42:30 +0300180 goto err;
Alexey Starikovskiya2f93ae2008-11-12 01:40:19 +0300181 } else if (ec->curr->rlen > ec->curr->ri) {
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400182 if ((status & ACPI_EC_FLAG_OBF) == 1) {
Alexey Starikovskiya2f93ae2008-11-12 01:40:19 +0300183 ec->curr->rdata[ec->curr->ri++] = acpi_ec_read_data(ec);
184 if (ec->curr->rlen == ec->curr->ri)
Alexey Starikovskiydd15f8c2008-11-08 21:42:30 +0300185 ec->curr->done = true;
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400186 } else
Alexey Starikovskiydd15f8c2008-11-08 21:42:30 +0300187 goto err;
Alexey Starikovskiya2f93ae2008-11-12 01:40:19 +0300188 } else if (ec->curr->wlen == ec->curr->wi &&
189 (status & ACPI_EC_FLAG_IBF) == 0)
Alexey Starikovskiydd15f8c2008-11-08 21:42:30 +0300190 ec->curr->done = true;
191 goto unlock;
192err:
193 /* false interrupt, state didn't change */
Alexey Starikovskiy7b4d4692008-11-13 12:00:03 +0300194 if (in_interrupt())
195 ++ec->curr->irq_count;
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400196unlock:
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400197 spin_unlock_irqrestore(&ec->curr_lock, flags);
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400198}
199
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300200static int acpi_ec_sync_query(struct acpi_ec *ec);
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400201
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300202static int ec_check_sci_sync(struct acpi_ec *ec, u8 state)
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400203{
204 if (state & ACPI_EC_FLAG_SCI) {
205 if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags))
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300206 return acpi_ec_sync_query(ec);
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400207 }
Denis M. Sadykov7c6db5e2006-09-26 19:50:33 +0400208 return 0;
209}
210
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400211static int ec_poll(struct acpi_ec *ec)
Alexey Starikovskiy845625c2008-03-21 17:07:03 +0300212{
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400213 unsigned long flags;
214 int repeat = 2; /* number of command restarts */
215 while (repeat--) {
216 unsigned long delay = jiffies +
Thomas Renninger7a18e962010-10-21 18:24:57 +0200217 msecs_to_jiffies(ec_delay);
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400218 do {
219 /* don't sleep with disabled interrupts */
220 if (EC_FLAGS_MSI || irqs_disabled()) {
221 udelay(ACPI_EC_MSI_UDELAY);
222 if (ec_transaction_done(ec))
223 return 0;
224 } else {
225 if (wait_event_timeout(ec->wait,
226 ec_transaction_done(ec),
227 msecs_to_jiffies(1)))
228 return 0;
229 }
230 advance_transaction(ec, acpi_ec_read_status(ec));
231 } while (time_before(jiffies, delay));
Alexey Starikovskiye12ac3d2009-10-02 02:53:15 +0400232 if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF)
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400233 break;
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400234 pr_debug(PREFIX "controller reset, restart transaction\n");
235 spin_lock_irqsave(&ec->curr_lock, flags);
236 start_transaction(ec);
237 spin_unlock_irqrestore(&ec->curr_lock, flags);
Alexey Starikovskiyaf3fd142006-12-07 18:42:16 +0300238 }
Alexey Starikovskiyb77d81b2008-03-21 17:07:15 +0300239 return -ETIME;
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500240}
241
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400242static int acpi_ec_transaction_unlocked(struct acpi_ec *ec,
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400243 struct transaction *t)
Lennart Poetteringd7a76e42006-09-05 12:12:24 -0400244{
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400245 unsigned long tmp;
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400246 int ret = 0;
Alexey Starikovskiy5423a0c2009-02-21 12:18:13 -0500247 if (EC_FLAGS_MSI)
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400248 udelay(ACPI_EC_MSI_UDELAY);
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400249 /* start transaction */
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400250 spin_lock_irqsave(&ec->curr_lock, tmp);
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400251 /* following two actions should be kept atomic */
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400252 ec->curr = t;
Alexey Starikovskiya2f93ae2008-11-12 01:40:19 +0300253 start_transaction(ec);
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400254 if (ec->curr->command == ACPI_EC_COMMAND_QUERY)
Alexey Starikovskiy080e4122007-10-22 14:18:30 +0400255 clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400256 spin_unlock_irqrestore(&ec->curr_lock, tmp);
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400257 ret = ec_poll(ec);
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400258 spin_lock_irqsave(&ec->curr_lock, tmp);
259 ec->curr = NULL;
260 spin_unlock_irqrestore(&ec->curr_lock, tmp);
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400261 return ret;
Lennart Poetteringd7a76e42006-09-05 12:12:24 -0400262}
263
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400264static int ec_check_ibf0(struct acpi_ec *ec)
265{
266 u8 status = acpi_ec_read_status(ec);
267 return (status & ACPI_EC_FLAG_IBF) == 0;
Lennart Poetteringd7a76e42006-09-05 12:12:24 -0400268}
269
Alexey Starikovskiyc0ff1772008-10-16 02:02:33 +0400270static int ec_wait_ibf0(struct acpi_ec *ec)
271{
Thomas Renninger7a18e962010-10-21 18:24:57 +0200272 unsigned long delay = jiffies + msecs_to_jiffies(ec_delay);
Alexey Starikovskiyc0ff1772008-10-16 02:02:33 +0400273 /* interrupt wait manually if GPE mode is not active */
Alexey Starikovskiyc0ff1772008-10-16 02:02:33 +0400274 while (time_before(jiffies, delay))
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400275 if (wait_event_timeout(ec->wait, ec_check_ibf0(ec),
276 msecs_to_jiffies(1)))
Alexey Starikovskiyc0ff1772008-10-16 02:02:33 +0400277 return 0;
278 return -ETIME;
279}
280
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400281static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t)
Luming Yu45bea152005-07-23 04:08:00 -0400282{
Lennart Poetteringd7a76e42006-09-05 12:12:24 -0400283 int status;
Len Brown50526df2005-08-11 17:32:05 -0400284 u32 glk;
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400285 if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata))
Patrick Mocheld550d982006-06-27 00:41:40 -0400286 return -EINVAL;
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400287 if (t->rdata)
288 memset(t->rdata, 0, t->rlen);
Alexey Starikovskiy523953b2006-12-07 18:42:17 +0300289 mutex_lock(&ec->lock);
Rafael J. Wysockife955682010-04-09 01:40:38 +0200290 if (test_bit(EC_FLAGS_BLOCKED, &ec->flags)) {
Rafael J. Wysockif6bb13a2010-03-04 01:52:58 +0100291 status = -EINVAL;
292 goto unlock;
293 }
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400294 if (ec->global_lock) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
Alexey Starikovskiyc24e9122007-02-15 23:16:18 +0300296 if (ACPI_FAILURE(status)) {
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400297 status = -ENODEV;
298 goto unlock;
Alexey Starikovskiyc24e9122007-02-15 23:16:18 +0300299 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 }
Alexey Starikovskiyc0ff1772008-10-16 02:02:33 +0400301 if (ec_wait_ibf0(ec)) {
Márton Németh3ebe08a2007-11-21 03:23:26 +0300302 pr_err(PREFIX "input buffer is not empty, "
303 "aborting transaction\n");
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400304 status = -ETIME;
Dmitry Torokhov451566f2005-03-19 01:10:05 -0500305 goto end;
Luming Yu716e0842005-08-10 01:40:00 -0400306 }
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300307 pr_debug(PREFIX "transaction start\n");
308 /* disable GPE during transaction if storm is detected */
309 if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
Rafael J. Wysocki37847302010-06-25 01:21:42 +0200310 /* It has to be disabled, so that it doesn't trigger. */
311 acpi_disable_gpe(NULL, ec->gpe);
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300312 }
313
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400314 status = acpi_ec_transaction_unlocked(ec, t);
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300315
316 /* check if we received SCI during transaction */
317 ec_check_sci_sync(ec, acpi_ec_read_status(ec));
318 if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
Alexey Starikovskiy54070102009-12-30 15:53:10 +0300319 msleep(1);
Rafael J. Wysocki37847302010-06-25 01:21:42 +0200320 /* It is safe to enable the GPE outside of the transaction. */
321 acpi_enable_gpe(NULL, ec->gpe);
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300322 } else if (t->irq_count > ACPI_EC_STORM_THRESHOLD) {
323 pr_info(PREFIX "GPE storm detected, "
324 "transactions will use polling mode\n");
325 set_bit(EC_FLAGS_GPE_STORM, &ec->flags);
326 }
Alexey Starikovskiy54070102009-12-30 15:53:10 +0300327 pr_debug(PREFIX "transaction end\n");
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400328end:
Denis M. Sadykov703959d2006-09-26 19:50:33 +0400329 if (ec->global_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 acpi_release_global_lock(glk);
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400331unlock:
Alexey Starikovskiy523953b2006-12-07 18:42:17 +0300332 mutex_unlock(&ec->lock);
Patrick Mocheld550d982006-06-27 00:41:40 -0400333 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334}
335
Roel Kluin8a383ef2008-12-09 20:45:30 +0100336static int acpi_ec_burst_enable(struct acpi_ec *ec)
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300337{
338 u8 d;
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400339 struct transaction t = {.command = ACPI_EC_BURST_ENABLE,
340 .wdata = NULL, .rdata = &d,
341 .wlen = 0, .rlen = 1};
342
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400343 return acpi_ec_transaction(ec, &t);
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300344}
345
Roel Kluin8a383ef2008-12-09 20:45:30 +0100346static int acpi_ec_burst_disable(struct acpi_ec *ec)
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300347{
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400348 struct transaction t = {.command = ACPI_EC_BURST_DISABLE,
349 .wdata = NULL, .rdata = NULL,
350 .wlen = 0, .rlen = 0};
351
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400352 return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ?
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400353 acpi_ec_transaction(ec, &t) : 0;
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300354}
355
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300356static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data)
Denis M. Sadykov3576cf62006-09-26 19:50:33 +0400357{
358 int result;
359 u8 d;
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400360 struct transaction t = {.command = ACPI_EC_COMMAND_READ,
361 .wdata = &address, .rdata = &d,
362 .wlen = 1, .rlen = 1};
Denis M. Sadykov3576cf62006-09-26 19:50:33 +0400363
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400364 result = acpi_ec_transaction(ec, &t);
Denis M. Sadykov3576cf62006-09-26 19:50:33 +0400365 *data = d;
366 return result;
367}
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400368
Denis M. Sadykov3576cf62006-09-26 19:50:33 +0400369static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data)
370{
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300371 u8 wdata[2] = { address, data };
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400372 struct transaction t = {.command = ACPI_EC_COMMAND_WRITE,
373 .wdata = wdata, .rdata = NULL,
374 .wlen = 2, .rlen = 0};
375
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400376 return acpi_ec_transaction(ec, &t);
Denis M. Sadykov3576cf62006-09-26 19:50:33 +0400377}
378
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379/*
380 * Externally callable EC access functions. For now, assume 1 EC only
381 */
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300382int ec_burst_enable(void)
383{
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300384 if (!first_ec)
385 return -ENODEV;
Alexey Starikovskiyd0338792007-03-07 22:28:00 +0300386 return acpi_ec_burst_enable(first_ec);
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300387}
388
389EXPORT_SYMBOL(ec_burst_enable);
390
391int ec_burst_disable(void)
392{
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300393 if (!first_ec)
394 return -ENODEV;
Alexey Starikovskiyd0338792007-03-07 22:28:00 +0300395 return acpi_ec_burst_disable(first_ec);
Alexey Starikovskiyc45aac42007-03-07 22:28:00 +0300396}
397
398EXPORT_SYMBOL(ec_burst_disable);
399
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300400int ec_read(u8 addr, u8 * val)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 int err;
Denis M. Sadykov6ffb2212006-09-26 19:50:33 +0400403 u8 temp_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404
405 if (!first_ec)
406 return -ENODEV;
407
Alexey Starikovskiyd0338792007-03-07 22:28:00 +0300408 err = acpi_ec_read(first_ec, addr, &temp_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409
410 if (!err) {
411 *val = temp_data;
412 return 0;
Len Brown50526df2005-08-11 17:32:05 -0400413 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 return err;
415}
Len Brown50526df2005-08-11 17:32:05 -0400416
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417EXPORT_SYMBOL(ec_read);
418
Len Brown50526df2005-08-11 17:32:05 -0400419int ec_write(u8 addr, u8 val)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 int err;
422
423 if (!first_ec)
424 return -ENODEV;
425
Alexey Starikovskiyd0338792007-03-07 22:28:00 +0300426 err = acpi_ec_write(first_ec, addr, val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427
428 return err;
429}
Len Brown50526df2005-08-11 17:32:05 -0400430
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431EXPORT_SYMBOL(ec_write);
432
Randy Dunlap616362d2006-10-27 01:47:34 -0400433int ec_transaction(u8 command,
Alexey Starikovskiy9e197212007-03-07 18:29:35 -0500434 const u8 * wdata, unsigned wdata_len,
Thomas Renninger1cb7b1e2011-03-31 13:36:38 +0200435 u8 * rdata, unsigned rdata_len)
Luming Yu45bea152005-07-23 04:08:00 -0400436{
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400437 struct transaction t = {.command = command,
438 .wdata = wdata, .rdata = rdata,
439 .wlen = wdata_len, .rlen = rdata_len};
Lennart Poetteringd7a76e42006-09-05 12:12:24 -0400440 if (!first_ec)
441 return -ENODEV;
442
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400443 return acpi_ec_transaction(first_ec, &t);
Luming Yu45bea152005-07-23 04:08:00 -0400444}
Luming Yu45bea152005-07-23 04:08:00 -0400445
Lennart Poetteringab9e43c2006-10-03 22:49:00 -0400446EXPORT_SYMBOL(ec_transaction);
447
Rafael J. Wysockife955682010-04-09 01:40:38 +0200448void acpi_ec_block_transactions(void)
Rafael J. Wysockif6bb13a2010-03-04 01:52:58 +0100449{
450 struct acpi_ec *ec = first_ec;
451
452 if (!ec)
453 return;
454
455 mutex_lock(&ec->lock);
456 /* Prevent transactions from being carried out */
Rafael J. Wysockife955682010-04-09 01:40:38 +0200457 set_bit(EC_FLAGS_BLOCKED, &ec->flags);
Rafael J. Wysockif6bb13a2010-03-04 01:52:58 +0100458 mutex_unlock(&ec->lock);
459}
460
Rafael J. Wysockife955682010-04-09 01:40:38 +0200461void acpi_ec_unblock_transactions(void)
Rafael J. Wysockif6bb13a2010-03-04 01:52:58 +0100462{
463 struct acpi_ec *ec = first_ec;
464
465 if (!ec)
466 return;
467
468 mutex_lock(&ec->lock);
469 /* Allow transactions to be carried out again */
Rafael J. Wysockife955682010-04-09 01:40:38 +0200470 clear_bit(EC_FLAGS_BLOCKED, &ec->flags);
Rafael J. Wysockif6bb13a2010-03-04 01:52:58 +0100471 mutex_unlock(&ec->lock);
472}
473
Rafael J. Wysockife955682010-04-09 01:40:38 +0200474void acpi_ec_unblock_transactions_early(void)
Rafael J. Wysockid5a64512010-04-09 01:39:40 +0200475{
476 /*
477 * Allow transactions to happen again (this function is called from
478 * atomic context during wakeup, so we don't need to acquire the mutex).
479 */
480 if (first_ec)
Rafael J. Wysockife955682010-04-09 01:40:38 +0200481 clear_bit(EC_FLAGS_BLOCKED, &first_ec->flags);
Rafael J. Wysockid5a64512010-04-09 01:39:40 +0200482}
483
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300484static int acpi_ec_query_unlocked(struct acpi_ec *ec, u8 * data)
Denis M. Sadykov3576cf62006-09-26 19:50:33 +0400485{
486 int result;
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300487 u8 d;
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400488 struct transaction t = {.command = ACPI_EC_COMMAND_QUERY,
489 .wdata = NULL, .rdata = &d,
490 .wlen = 0, .rlen = 1};
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300491 if (!ec || !data)
492 return -EINVAL;
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300493 /*
494 * Query the EC to find out which _Qxx method we need to evaluate.
495 * Note that successful completion of the query causes the ACPI_EC_SCI
496 * bit to be cleared (and thus clearing the interrupt source).
497 */
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300498 result = acpi_ec_transaction_unlocked(ec, &t);
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300499 if (result)
500 return result;
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300501 if (!d)
502 return -ENODATA;
Alexey Starikovskiy6ccedb12006-12-07 18:42:17 +0300503 *data = d;
504 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505}
506
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507/* --------------------------------------------------------------------------
508 Event Management
509 -------------------------------------------------------------------------- */
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400510int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit,
511 acpi_handle handle, acpi_ec_query_func func,
512 void *data)
513{
514 struct acpi_ec_query_handler *handler =
515 kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL);
516 if (!handler)
517 return -ENOMEM;
518
519 handler->query_bit = query_bit;
520 handler->handle = handle;
521 handler->func = func;
522 handler->data = data;
523 mutex_lock(&ec->lock);
Alexey Starikovskiy30c08572007-09-26 19:43:22 +0400524 list_add(&handler->node, &ec->list);
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400525 mutex_unlock(&ec->lock);
526 return 0;
527}
528
529EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler);
530
531void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit)
532{
Adrian Bunk1544fdb2007-10-24 18:26:00 +0200533 struct acpi_ec_query_handler *handler, *tmp;
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400534 mutex_lock(&ec->lock);
Adrian Bunk1544fdb2007-10-24 18:26:00 +0200535 list_for_each_entry_safe(handler, tmp, &ec->list, node) {
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400536 if (query_bit == handler->query_bit) {
537 list_del(&handler->node);
538 kfree(handler);
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400539 }
540 }
541 mutex_unlock(&ec->lock);
542}
543
544EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300546static void acpi_ec_run(void *cxt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547{
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300548 struct acpi_ec_query_handler *handler = cxt;
549 if (!handler)
Alexey Starikovskiye41334c2006-12-07 18:42:16 +0300550 return;
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300551 pr_debug(PREFIX "start query execution\n");
552 if (handler->func)
553 handler->func(handler->data);
554 else if (handler->handle)
555 acpi_evaluate_object(handler->handle, NULL, NULL, NULL);
556 pr_debug(PREFIX "stop query execution\n");
557 kfree(handler);
558}
559
560static int acpi_ec_sync_query(struct acpi_ec *ec)
561{
562 u8 value = 0;
563 int status;
564 struct acpi_ec_query_handler *handler, *copy;
565 if ((status = acpi_ec_query_unlocked(ec, &value)))
566 return status;
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400567 list_for_each_entry(handler, &ec->list, node) {
568 if (value == handler->query_bit) {
569 /* have custom handler for this bit */
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300570 copy = kmalloc(sizeof(*handler), GFP_KERNEL);
571 if (!copy)
572 return -ENOMEM;
573 memcpy(copy, handler, sizeof(*copy));
574 pr_debug(PREFIX "push query execution (0x%2x) on queue\n", value);
Alexey Starikovskiyf5347862009-12-30 15:53:03 +0300575 return acpi_os_execute((copy->func) ?
576 OSL_NOTIFY_HANDLER : OSL_GPE_HANDLER,
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300577 acpi_ec_run, copy);
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400578 }
579 }
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300580 return 0;
581}
582
583static void acpi_ec_gpe_query(void *ec_cxt)
584{
585 struct acpi_ec *ec = ec_cxt;
586 if (!ec)
587 return;
588 mutex_lock(&ec->lock);
589 acpi_ec_sync_query(ec);
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400590 mutex_unlock(&ec->lock);
Luming Yu45bea152005-07-23 04:08:00 -0400591}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300593static int ec_check_sci(struct acpi_ec *ec, u8 state)
594{
595 if (state & ACPI_EC_FLAG_SCI) {
596 if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) {
597 pr_debug(PREFIX "push gpe query to the queue\n");
598 return acpi_os_execute(OSL_NOTIFY_HANDLER,
599 acpi_ec_gpe_query, ec);
600 }
601 }
602 return 0;
603}
604
Lin Ming8b6cd8a2010-12-13 13:38:46 +0800605static u32 acpi_ec_gpe_handler(acpi_handle gpe_device,
606 u32 gpe_number, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607{
Alexey Starikovskiy3d02b902007-03-07 22:28:00 +0300608 struct acpi_ec *ec = data;
Lennart Poettering00eb43a2007-05-04 14:16:19 +0200609
Márton Németh3ebe08a2007-11-21 03:23:26 +0300610 pr_debug(PREFIX "~~~> interrupt\n");
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400611
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300612 advance_transaction(ec, acpi_ec_read_status(ec));
613 if (ec_transaction_done(ec) &&
614 (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) == 0) {
Alexey Starikovskiy2a84cb92009-08-30 03:06:14 +0400615 wake_up(&ec->wait);
Alexey Starikovskiya62e8f12009-12-24 11:34:16 +0300616 ec_check_sci(ec, acpi_ec_read_status(ec));
617 }
Lin Mingbba63a22010-12-13 13:39:17 +0800618 return ACPI_INTERRUPT_HANDLED | ACPI_REENABLE_GPE;
Alexey Starikovskiy845625c2008-03-21 17:07:03 +0300619}
620
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621/* --------------------------------------------------------------------------
622 Address Space Management
623 -------------------------------------------------------------------------- */
624
625static acpi_status
Alexey Starikovskiy5b7734b2007-05-29 16:42:52 +0400626acpi_ec_space_handler(u32 function, acpi_physical_address address,
Alexey Starikovskiydadf28a2010-03-17 13:14:13 -0400627 u32 bits, u64 *value64,
Len Brown50526df2005-08-11 17:32:05 -0400628 void *handler_context, void *region_context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629{
Alexey Starikovskiy3d02b902007-03-07 22:28:00 +0300630 struct acpi_ec *ec = handler_context;
Alexey Starikovskiydadf28a2010-03-17 13:14:13 -0400631 int result = 0, i, bytes = bits / 8;
632 u8 *value = (u8 *)value64;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 if ((address > 0xFF) || !value || !handler_context)
Patrick Mocheld550d982006-06-27 00:41:40 -0400635 return AE_BAD_PARAMETER;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636
Alexey Starikovskiy5b7734b2007-05-29 16:42:52 +0400637 if (function != ACPI_READ && function != ACPI_WRITE)
Patrick Mocheld550d982006-06-27 00:41:40 -0400638 return AE_BAD_PARAMETER;
Alexey Starikovskiy5b7734b2007-05-29 16:42:52 +0400639
Alexey Starikovskiydadf28a2010-03-17 13:14:13 -0400640 if (EC_FLAGS_MSI || bits > 8)
Alexey Starikovskiy6a63b06f2009-08-28 23:29:44 +0400641 acpi_ec_burst_enable(ec);
Alexey Starikovskiyb3b233c2008-01-11 02:42:57 +0300642
Alexey Starikovskiydadf28a2010-03-17 13:14:13 -0400643 for (i = 0; i < bytes; ++i, ++address, ++value)
644 result = (function == ACPI_READ) ?
645 acpi_ec_read(ec, address, value) :
646 acpi_ec_write(ec, address, *value);
Alexey Starikovskiy3e71a872008-01-11 02:42:51 +0300647
Alexey Starikovskiydadf28a2010-03-17 13:14:13 -0400648 if (EC_FLAGS_MSI || bits > 8)
Alexey Starikovskiy6a63b06f2009-08-28 23:29:44 +0400649 acpi_ec_burst_disable(ec);
Alexey Starikovskiyb3b233c2008-01-11 02:42:57 +0300650
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 switch (result) {
652 case -EINVAL:
Patrick Mocheld550d982006-06-27 00:41:40 -0400653 return AE_BAD_PARAMETER;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 break;
655 case -ENODEV:
Patrick Mocheld550d982006-06-27 00:41:40 -0400656 return AE_NOT_FOUND;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 break;
658 case -ETIME:
Patrick Mocheld550d982006-06-27 00:41:40 -0400659 return AE_TIME;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 break;
661 default:
Patrick Mocheld550d982006-06-27 00:41:40 -0400662 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664}
665
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666/* --------------------------------------------------------------------------
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 Driver Interface
668 -------------------------------------------------------------------------- */
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300669static acpi_status
670ec_parse_io_ports(struct acpi_resource *resource, void *context);
671
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300672static struct acpi_ec *make_acpi_ec(void)
673{
674 struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL);
675 if (!ec)
676 return NULL;
Alexey Starikovskiy080e4122007-10-22 14:18:30 +0400677 ec->flags = 1 << EC_FLAGS_QUERY_PENDING;
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300678 mutex_init(&ec->lock);
679 init_waitqueue_head(&ec->wait);
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400680 INIT_LIST_HEAD(&ec->list);
Alexey Starikovskiy84632002008-09-26 00:54:28 +0400681 spin_lock_init(&ec->curr_lock);
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300682 return ec;
683}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400685static acpi_status
Alexey Starikovskiyc019b192007-08-14 01:03:42 -0400686acpi_ec_register_query_methods(acpi_handle handle, u32 level,
687 void *context, void **return_value)
688{
Lin Ming0175d562008-12-16 16:46:12 +0800689 char node_name[5];
690 struct acpi_buffer buffer = { sizeof(node_name), node_name };
Alexey Starikovskiyc019b192007-08-14 01:03:42 -0400691 struct acpi_ec *ec = context;
692 int value = 0;
Lin Ming0175d562008-12-16 16:46:12 +0800693 acpi_status status;
694
695 status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
696
697 if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) {
Alexey Starikovskiyc019b192007-08-14 01:03:42 -0400698 acpi_ec_add_query_handler(ec, value, handle, NULL, NULL);
699 }
700 return AE_OK;
701}
702
703static acpi_status
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400704ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval)
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400705{
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400706 acpi_status status;
Alexey Starikovskiyd21cf3c2008-11-03 14:26:40 -0500707 unsigned long long tmp = 0;
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400708
709 struct acpi_ec *ec = context;
Alexey Starikovskiya5032bf2009-04-01 01:33:15 -0400710
711 /* clear addr values, ec_parse_io_ports depend on it */
712 ec->command_addr = ec->data_addr = 0;
713
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400714 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
715 ec_parse_io_ports, ec);
716 if (ACPI_FAILURE(status))
717 return status;
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400718
719 /* Get GPE bit assignment (EC events). */
720 /* TODO: Add support for _GPE returning a package */
Matthew Wilcox27663c52008-10-10 02:22:59 -0400721 status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp);
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400722 if (ACPI_FAILURE(status))
723 return status;
Matthew Wilcox27663c52008-10-10 02:22:59 -0400724 ec->gpe = tmp;
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400725 /* Use the global lock for all EC transactions? */
Alexey Starikovskiyd21cf3c2008-11-03 14:26:40 -0500726 tmp = 0;
Matthew Wilcox27663c52008-10-10 02:22:59 -0400727 acpi_evaluate_integer(handle, "_GLK", NULL, &tmp);
728 ec->global_lock = tmp;
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400729 ec->handle = handle;
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400730 return AE_CTRL_TERMINATE;
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400731}
732
Alexey Starikovskiye8284322007-03-07 22:28:00 +0300733static int ec_install_handlers(struct acpi_ec *ec)
734{
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300735 acpi_status status;
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400736 if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags))
Alexey Starikovskiy4c611062007-09-05 19:56:38 -0400737 return 0;
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300738 status = acpi_install_gpe_handler(NULL, ec->gpe,
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400739 ACPI_GPE_EDGE_TRIGGERED,
740 &acpi_ec_gpe_handler, ec);
Alexey Starikovskiye8284322007-03-07 22:28:00 +0300741 if (ACPI_FAILURE(status))
742 return -ENODEV;
Rafael J. Wysocki9630bdd2010-02-17 23:41:07 +0100743
Rafael J. Wysockia44061a2010-07-01 10:11:45 +0800744 acpi_enable_gpe(NULL, ec->gpe);
Alexey Starikovskiye8284322007-03-07 22:28:00 +0300745 status = acpi_install_address_space_handler(ec->handle,
746 ACPI_ADR_SPACE_EC,
747 &acpi_ec_space_handler,
Alexey Starikovskiy6d9e1122008-03-24 23:22:29 +0300748 NULL, ec);
Alexey Starikovskiye8284322007-03-07 22:28:00 +0300749 if (ACPI_FAILURE(status)) {
Zhao Yakui20edd742008-10-17 02:02:44 -0400750 if (status == AE_NOT_FOUND) {
751 /*
752 * Maybe OS fails in evaluating the _REG object.
753 * The AE_NOT_FOUND error will be ignored and OS
754 * continue to initialize EC.
755 */
756 printk(KERN_ERR "Fail in evaluating the _REG object"
757 " of EC device. Broken bios is suspected.\n");
758 } else {
759 acpi_remove_gpe_handler(NULL, ec->gpe,
760 &acpi_ec_gpe_handler);
Rafael J. Wysockia44061a2010-07-01 10:11:45 +0800761 acpi_disable_gpe(NULL, ec->gpe);
Zhao Yakui20edd742008-10-17 02:02:44 -0400762 return -ENODEV;
763 }
Alexey Starikovskiye8284322007-03-07 22:28:00 +0300764 }
765
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400766 set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags);
Alexey Starikovskiye8284322007-03-07 22:28:00 +0300767 return 0;
768}
769
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770static void ec_remove_handlers(struct acpi_ec *ec)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771{
Rafael J. Wysockia44061a2010-07-01 10:11:45 +0800772 acpi_disable_gpe(NULL, ec->gpe);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle,
774 ACPI_ADR_SPACE_EC, &acpi_ec_space_handler)))
775 pr_err(PREFIX "failed to remove space handler\n");
776 if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe,
777 &acpi_ec_gpe_handler)))
778 pr_err(PREFIX "failed to remove gpe handler\n");
779 clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags);
780}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782static int acpi_ec_add(struct acpi_device *device)
783{
784 struct acpi_ec *ec = NULL;
Bjorn Helgaasd02be042009-06-22 20:41:35 +0000785 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787 strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
788 strcpy(acpi_device_class(device), ACPI_EC_CLASS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790 /* Check for boot EC */
791 if (boot_ec &&
792 (boot_ec->handle == device->handle ||
793 boot_ec->handle == ACPI_ROOT_OBJECT)) {
794 ec = boot_ec;
795 boot_ec = NULL;
796 } else {
797 ec = make_acpi_ec();
798 if (!ec)
799 return -ENOMEM;
800 }
801 if (ec_parse_device(device->handle, 0, ec, NULL) !=
802 AE_CTRL_TERMINATE) {
803 kfree(ec);
804 return -EINVAL;
805 }
806
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 /* Find and register all query methods */
808 acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1,
Lin Ming22635762009-11-13 10:06:08 +0800809 acpi_ec_register_query_methods, NULL, ec, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810
811 if (!first_ec)
812 first_ec = ec;
813 device->driver_data = ec;
Thomas Renningerde4f1042010-07-29 22:08:44 +0200814
815 WARN(!request_region(ec->data_addr, 1, "EC data"),
816 "Could not request EC data io port 0x%lx", ec->data_addr);
817 WARN(!request_region(ec->command_addr, 1, "EC cmd"),
818 "Could not request EC cmd io port 0x%lx", ec->command_addr);
819
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820 pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n",
821 ec->gpe, ec->command_addr, ec->data_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822
Alexey Starikovskiy4c611062007-09-05 19:56:38 -0400823 ret = ec_install_handlers(ec);
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300824
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400825 /* EC is fully operational, allow queries */
Alexey Starikovskiy080e4122007-10-22 14:18:30 +0400826 clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
Alexey Starikovskiy837012e2007-05-29 16:43:02 +0400827 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828}
829
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830static int acpi_ec_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831{
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300832 struct acpi_ec *ec;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833 struct acpi_ec_query_handler *handler, *tmp;
834
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400836 return -EINVAL;
Alexey Starikovskiyf9319f92007-08-24 08:10:11 +0400837
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838 ec = acpi_driver_data(device);
Bjorn Helgaascf745ec2009-06-22 20:41:40 +0000839 ec_remove_handlers(ec);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840 mutex_lock(&ec->lock);
841 list_for_each_entry_safe(handler, tmp, &ec->list, node) {
842 list_del(&handler->node);
843 kfree(handler);
844 }
845 mutex_unlock(&ec->lock);
Thomas Renningerde4f1042010-07-29 22:08:44 +0200846 release_region(ec->data_addr, 1);
847 release_region(ec->command_addr, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848 device->driver_data = NULL;
849 if (ec == first_ec)
850 first_ec = NULL;
851 kfree(ec);
Patrick Mocheld550d982006-06-27 00:41:40 -0400852 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853}
854
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855static acpi_status
856ec_parse_io_ports(struct acpi_resource *resource, void *context)
857{
858 struct acpi_ec *ec = context;
859
860 if (resource->type != ACPI_RESOURCE_TYPE_IO)
861 return AE_OK;
862
863 /*
864 * The first address region returned is the data port, and
865 * the second address region returned is the status/command
866 * port.
867 */
Thomas Renningerde4f1042010-07-29 22:08:44 +0200868 if (ec->data_addr == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869 ec->data_addr = resource->data.io.minimum;
Thomas Renningerde4f1042010-07-29 22:08:44 +0200870 else if (ec->command_addr == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 ec->command_addr = resource->data.io.minimum;
872 else
873 return AE_CTRL_TERMINATE;
874
875 return AE_OK;
876}
877
Alexey Starikovskiyc04209a2008-01-01 14:12:55 -0500878int __init acpi_boot_ec_enable(void)
879{
Alexey Starikovskiy7c6db4e2008-09-25 21:00:31 +0400880 if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags))
Alexey Starikovskiyc04209a2008-01-01 14:12:55 -0500881 return 0;
882 if (!ec_install_handlers(boot_ec)) {
883 first_ec = boot_ec;
884 return 0;
885 }
886 return -EFAULT;
887}
888
Alexey Starikovskiy223883b2008-03-21 17:07:21 +0300889static const struct acpi_device_id ec_device_ids[] = {
890 {"PNP0C09", 0},
891 {"", 0},
892};
893
Alexey Starikovskiy478fa032009-10-02 20:21:40 +0400894/* Some BIOS do not survive early DSDT scan, skip it */
895static int ec_skip_dsdt_scan(const struct dmi_system_id *id)
896{
897 EC_FLAGS_SKIP_DSDT_SCAN = 1;
898 return 0;
899}
900
Alexey Starikovskiy0adf3c72009-10-02 20:21:33 +0400901/* ASUStek often supplies us with broken ECDT, validate it */
902static int ec_validate_ecdt(const struct dmi_system_id *id)
903{
904 EC_FLAGS_VALIDATE_ECDT = 1;
905 return 0;
906}
907
908/* MSI EC needs special treatment, enable it */
909static int ec_flag_msi(const struct dmi_system_id *id)
910{
Alexey Starikovskiy55b313f2009-12-22 02:42:52 -0500911 printk(KERN_DEBUG PREFIX "Detected MSI hardware, enabling workarounds.\n");
Alexey Starikovskiy0adf3c72009-10-02 20:21:33 +0400912 EC_FLAGS_MSI = 1;
913 EC_FLAGS_VALIDATE_ECDT = 1;
914 return 0;
915}
916
917static struct dmi_system_id __initdata ec_dmi_table[] = {
918 {
Alexey Starikovskiy478fa032009-10-02 20:21:40 +0400919 ec_skip_dsdt_scan, "Compal JFL92", {
920 DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),
921 DMI_MATCH(DMI_BOARD_NAME, "JFL92") }, NULL},
922 {
Alexey Starikovskiy0adf3c72009-10-02 20:21:33 +0400923 ec_flag_msi, "MSI hardware", {
Alexey Starikovskiy55b313f2009-12-22 02:42:52 -0500924 DMI_MATCH(DMI_BIOS_VENDOR, "Micro-Star")}, NULL},
925 {
926 ec_flag_msi, "MSI hardware", {
927 DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star")}, NULL},
928 {
929 ec_flag_msi, "MSI hardware", {
930 DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-Star")}, NULL},
Alexey Starikovskiy0adf3c72009-10-02 20:21:33 +0400931 {
Alexey Starikovskiya5dc4f82010-12-09 17:07:54 -0500932 ec_flag_msi, "MSI hardware", {
933 DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-STAR")}, NULL},
934 {
Zhang Rui534bc4e2011-04-26 16:30:02 +0800935 ec_flag_msi, "Quanta hardware", {
936 DMI_MATCH(DMI_SYS_VENDOR, "Quanta"),
937 DMI_MATCH(DMI_PRODUCT_NAME, "TW8/SW8/DW8"),}, NULL},
938 {
939 ec_flag_msi, "Quanta hardware", {
940 DMI_MATCH(DMI_SYS_VENDOR, "Quanta"),
941 DMI_MATCH(DMI_PRODUCT_NAME, "TW9/SW9"),}, NULL},
942 {
Alexey Starikovskiy0adf3c72009-10-02 20:21:33 +0400943 ec_validate_ecdt, "ASUS hardware", {
944 DMI_MATCH(DMI_BIOS_VENDOR, "ASUS") }, NULL},
Peter Collingbourneaf986d12011-04-24 22:09:32 +0100945 {
946 ec_validate_ecdt, "ASUS hardware", {
947 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc.") }, NULL},
Alexey Starikovskiy0adf3c72009-10-02 20:21:33 +0400948 {},
949};
950
951
Len Brown50526df2005-08-11 17:32:05 -0400952int __init acpi_ec_ecdt_probe(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953{
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300954 acpi_status status;
Alexey Starikovskiyc6cb0e82009-01-14 02:57:53 +0300955 struct acpi_ec *saved_ec = NULL;
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300956 struct acpi_table_ecdt *ecdt_ptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957
Alexey Starikovskiyd66d9692007-03-07 22:28:00 +0300958 boot_ec = make_acpi_ec();
959 if (!boot_ec)
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300960 return -ENOMEM;
961 /*
962 * Generate a boot ec context
963 */
Alexey Starikovskiy0adf3c72009-10-02 20:21:33 +0400964 dmi_check_system(ec_dmi_table);
Alexey Starikovskiyc0900c32007-03-07 22:28:00 +0300965 status = acpi_get_table(ACPI_SIG_ECDT, 1,
966 (struct acpi_table_header **)&ecdt_ptr);
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400967 if (ACPI_SUCCESS(status)) {
Márton Németh3ebe08a2007-11-21 03:23:26 +0300968 pr_info(PREFIX "EC description table is found, configuring boot EC\n");
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400969 boot_ec->command_addr = ecdt_ptr->control.address;
970 boot_ec->data_addr = ecdt_ptr->data.address;
971 boot_ec->gpe = ecdt_ptr->gpe;
Len Brown4af8e102008-03-11 00:27:16 -0400972 boot_ec->handle = ACPI_ROOT_OBJECT;
Alexey Starikovskiyce52ddf2008-03-24 23:22:36 +0300973 acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle);
Alexey Starikovskiyc6cb0e82009-01-14 02:57:53 +0300974 /* Don't trust ECDT, which comes from ASUSTek */
Alexey Starikovskiy0adf3c72009-10-02 20:21:33 +0400975 if (!EC_FLAGS_VALIDATE_ECDT)
Alexey Starikovskiyc5279de2008-11-26 17:11:53 -0500976 goto install;
Julia Lawalld6bd5352010-05-15 23:16:21 +0200977 saved_ec = kmemdup(boot_ec, sizeof(struct acpi_ec), GFP_KERNEL);
Alexey Starikovskiyc6cb0e82009-01-14 02:57:53 +0300978 if (!saved_ec)
979 return -ENOMEM;
Alexey Starikovskiyc5279de2008-11-26 17:11:53 -0500980 /* fall through */
Alexey Starikovskiycd8c93a2007-08-03 17:52:48 -0400981 }
Alexey Starikovskiy0adf3c72009-10-02 20:21:33 +0400982
Alexey Starikovskiy478fa032009-10-02 20:21:40 +0400983 if (EC_FLAGS_SKIP_DSDT_SCAN)
984 return -ENODEV;
985
Alexey Starikovskiyc5279de2008-11-26 17:11:53 -0500986 /* This workaround is needed only on some broken machines,
987 * which require early EC, but fail to provide ECDT */
Alexey Starikovskiyc5279de2008-11-26 17:11:53 -0500988 printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n");
989 status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device,
990 boot_ec, NULL);
991 /* Check that acpi_get_devices actually find something */
992 if (ACPI_FAILURE(status) || !boot_ec->handle)
993 goto error;
Alexey Starikovskiyc6cb0e82009-01-14 02:57:53 +0300994 if (saved_ec) {
995 /* try to find good ECDT from ASUSTek */
996 if (saved_ec->command_addr != boot_ec->command_addr ||
997 saved_ec->data_addr != boot_ec->data_addr ||
998 saved_ec->gpe != boot_ec->gpe ||
999 saved_ec->handle != boot_ec->handle)
1000 pr_info(PREFIX "ASUSTek keeps feeding us with broken "
1001 "ECDT tables, which are very hard to workaround. "
1002 "Trying to use DSDT EC info instead. Please send "
1003 "output of acpidump to linux-acpi@vger.kernel.org\n");
1004 kfree(saved_ec);
1005 saved_ec = NULL;
1006 } else {
1007 /* We really need to limit this workaround, the only ASUS,
1008 * which needs it, has fake EC._INI method, so use it as flag.
1009 * Keep boot_ec struct as it will be needed soon.
1010 */
1011 acpi_handle dummy;
1012 if (!dmi_name_in_vendors("ASUS") ||
1013 ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI",
1014 &dummy)))
1015 return -ENODEV;
1016 }
Alexey Starikovskiyc5279de2008-11-26 17:11:53 -05001017install:
1018 if (!ec_install_handlers(boot_ec)) {
Alexey Starikovskiyd0338792007-03-07 22:28:00 +03001019 first_ec = boot_ec;
Alexey Starikovskiye8284322007-03-07 22:28:00 +03001020 return 0;
Alexey Starikovskiyd0338792007-03-07 22:28:00 +03001021 }
Alexey Starikovskiyc5279de2008-11-26 17:11:53 -05001022error:
Alexey Starikovskiyd66d9692007-03-07 22:28:00 +03001023 kfree(boot_ec);
1024 boot_ec = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025 return -ENODEV;
1026}
1027
Alexey Starikovskiy223883b2008-03-21 17:07:21 +03001028static struct acpi_driver acpi_ec_driver = {
1029 .name = "ec",
1030 .class = ACPI_EC_CLASS,
1031 .ids = ec_device_ids,
1032 .ops = {
1033 .add = acpi_ec_add,
1034 .remove = acpi_ec_remove,
Alexey Starikovskiy223883b2008-03-21 17:07:21 +03001035 },
1036};
1037
Bjorn Helgaasa5f820f2009-03-24 16:49:48 -06001038int __init acpi_ec_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039{
Len Brown50526df2005-08-11 17:32:05 -04001040 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 /* Now register the driver for the EC */
1043 result = acpi_bus_register_driver(&acpi_ec_driver);
Thomas Renninger49c6c5f2010-07-16 13:11:34 +02001044 if (result < 0)
Patrick Mocheld550d982006-06-27 00:41:40 -04001045 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046
Patrick Mocheld550d982006-06-27 00:41:40 -04001047 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048}
1049
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050/* EC driver currently not unloadable */
1051#if 0
Len Brown50526df2005-08-11 17:32:05 -04001052static void __exit acpi_ec_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054
1055 acpi_bus_unregister_driver(&acpi_ec_driver);
Patrick Mocheld550d982006-06-27 00:41:40 -04001056 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057}
Alexey Starikovskiy78439322007-10-22 14:18:43 +04001058#endif /* 0 */