![Len Brown](/assets/img/avatar_default.png)
if somebody uses "ec_intr=", lets be sure to capture that in the dmesg even in the non-debug case. Signed-off-by: Len Brown <len.brown@intel.com>
1026 lines
24 KiB
C
1026 lines
24 KiB
C
/*
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* acpi_ec.c - ACPI Embedded Controller Driver ($Revision: 38 $)
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*
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* Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
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* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/delay.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/interrupt.h>
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#include <asm/io.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.h>
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#include <acpi/actypes.h>
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#define _COMPONENT ACPI_EC_COMPONENT
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ACPI_MODULE_NAME("acpi_ec")
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#define ACPI_EC_COMPONENT 0x00100000
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#define ACPI_EC_CLASS "embedded_controller"
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#define ACPI_EC_HID "PNP0C09"
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#define ACPI_EC_DRIVER_NAME "ACPI Embedded Controller Driver"
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#define ACPI_EC_DEVICE_NAME "Embedded Controller"
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#define ACPI_EC_FILE_INFO "info"
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#undef PREFIX
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#define PREFIX "ACPI: EC: "
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/* EC status register */
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#define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */
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#define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */
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#define ACPI_EC_FLAG_BURST 0x10 /* burst mode */
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#define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */
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/* EC commands */
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enum ec_command {
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ACPI_EC_COMMAND_READ = 0x80,
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ACPI_EC_COMMAND_WRITE = 0x81,
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ACPI_EC_BURST_ENABLE = 0x82,
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ACPI_EC_BURST_DISABLE = 0x83,
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ACPI_EC_COMMAND_QUERY = 0x84,
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};
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/* EC events */
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enum ec_event {
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ACPI_EC_EVENT_OBF_1 = 1, /* Output buffer full */
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ACPI_EC_EVENT_IBF_0, /* Input buffer empty */
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};
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#define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */
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#define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */
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static enum ec_mode {
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EC_INTR = 1, /* Output buffer full */
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EC_POLL, /* Input buffer empty */
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} acpi_ec_mode = EC_INTR;
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static int acpi_ec_remove(struct acpi_device *device, int type);
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static int acpi_ec_start(struct acpi_device *device);
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static int acpi_ec_stop(struct acpi_device *device, int type);
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static int acpi_ec_add(struct acpi_device *device);
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static struct acpi_driver acpi_ec_driver = {
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.name = ACPI_EC_DRIVER_NAME,
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.class = ACPI_EC_CLASS,
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.ids = ACPI_EC_HID,
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.ops = {
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.add = acpi_ec_add,
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.remove = acpi_ec_remove,
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.start = acpi_ec_start,
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.stop = acpi_ec_stop,
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},
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};
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/* If we find an EC via the ECDT, we need to keep a ptr to its context */
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static struct acpi_ec {
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acpi_handle handle;
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unsigned long uid;
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unsigned long gpe;
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unsigned long command_addr;
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unsigned long data_addr;
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unsigned long global_lock;
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struct mutex lock;
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atomic_t query_pending;
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atomic_t leaving_burst; /* 0 : No, 1 : Yes, 2: abort */
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wait_queue_head_t wait;
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} *ec_ecdt;
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/* External interfaces use first EC only, so remember */
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static struct acpi_device *first_ec;
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/* --------------------------------------------------------------------------
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Transaction Management
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-------------------------------------------------------------------------- */
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static inline u8 acpi_ec_read_status(struct acpi_ec *ec)
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{
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return inb(ec->command_addr);
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}
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static inline u8 acpi_ec_read_data(struct acpi_ec *ec)
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{
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return inb(ec->data_addr);
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}
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static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command)
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{
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outb(command, ec->command_addr);
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}
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static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data)
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{
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outb(data, ec->data_addr);
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}
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static inline int acpi_ec_check_status(struct acpi_ec *ec, enum ec_event event)
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{
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u8 status = acpi_ec_read_status(ec);
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if (event == ACPI_EC_EVENT_OBF_1) {
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if (status & ACPI_EC_FLAG_OBF)
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return 1;
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} else if (event == ACPI_EC_EVENT_IBF_0) {
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if (!(status & ACPI_EC_FLAG_IBF))
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return 1;
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}
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return 0;
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}
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static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event)
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{
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if (acpi_ec_mode == EC_POLL) {
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unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY);
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while (time_before(jiffies, delay)) {
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if (acpi_ec_check_status(ec, event))
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return 0;
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}
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} else {
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if (wait_event_timeout(ec->wait,
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acpi_ec_check_status(ec, event),
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msecs_to_jiffies(ACPI_EC_DELAY)) ||
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acpi_ec_check_status(ec, event)) {
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return 0;
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} else {
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printk(KERN_ERR PREFIX "acpi_ec_wait timeout,"
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" status = %d, expect_event = %d\n",
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acpi_ec_read_status(ec), event);
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}
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}
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return -ETIME;
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}
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#ifdef ACPI_FUTURE_USAGE
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/*
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* Note: samsung nv5000 doesn't work with ec burst mode.
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* http://bugzilla.kernel.org/show_bug.cgi?id=4980
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*/
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int acpi_ec_enter_burst_mode(struct acpi_ec *ec)
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{
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u8 tmp = 0;
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u8 status = 0;
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status = acpi_ec_read_status(ec);
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if (status != -EINVAL && !(status & ACPI_EC_FLAG_BURST)) {
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status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0);
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if (status)
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goto end;
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acpi_ec_write_cmd(ec, ACPI_EC_BURST_ENABLE);
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status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1);
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tmp = acpi_ec_read_data(ec);
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if (tmp != 0x90) { /* Burst ACK byte */
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return -EINVAL;
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}
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}
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atomic_set(&ec->leaving_burst, 0);
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return 0;
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end:
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ACPI_EXCEPTION((AE_INFO, status, "EC wait, burst mode"));
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return -1;
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}
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int acpi_ec_leave_burst_mode(struct acpi_ec *ec)
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{
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u8 status = 0;
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status = acpi_ec_read_status(ec);
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if (status != -EINVAL && (status & ACPI_EC_FLAG_BURST)) {
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status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0);
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if (status)
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goto end;
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acpi_ec_write_cmd(ec, ACPI_EC_BURST_DISABLE);
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acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0);
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}
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atomic_set(&ec->leaving_burst, 1);
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return 0;
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end:
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ACPI_EXCEPTION((AE_INFO, status, "EC leave burst mode"));
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return -1;
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}
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#endif /* ACPI_FUTURE_USAGE */
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static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command,
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const u8 * wdata, unsigned wdata_len,
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u8 * rdata, unsigned rdata_len)
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{
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int result = 0;
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acpi_ec_write_cmd(ec, command);
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for (; wdata_len > 0; --wdata_len) {
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result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0);
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if (result) {
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printk(KERN_ERR PREFIX
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"write_cmd timeout, command = %d\n", command);
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goto end;
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}
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acpi_ec_write_data(ec, *(wdata++));
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}
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if (!rdata_len) {
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result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0);
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if (result) {
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printk(KERN_ERR PREFIX
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"finish-write timeout, command = %d\n", command);
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goto end;
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}
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} else if (command == ACPI_EC_COMMAND_QUERY) {
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atomic_set(&ec->query_pending, 0);
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}
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for (; rdata_len > 0; --rdata_len) {
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result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1);
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if (result) {
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printk(KERN_ERR PREFIX "read timeout, command = %d\n",
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command);
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goto end;
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}
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*(rdata++) = acpi_ec_read_data(ec);
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}
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end:
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return result;
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}
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static int acpi_ec_transaction(struct acpi_ec *ec, u8 command,
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const u8 * wdata, unsigned wdata_len,
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u8 * rdata, unsigned rdata_len)
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{
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int status;
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u32 glk;
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if (!ec || (wdata_len && !wdata) || (rdata_len && !rdata))
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return -EINVAL;
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if (rdata)
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memset(rdata, 0, rdata_len);
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mutex_lock(&ec->lock);
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if (ec->global_lock) {
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status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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}
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/* Make sure GPE is enabled before doing transaction */
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acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
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status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0);
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if (status) {
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printk(KERN_DEBUG PREFIX
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"input buffer is not empty, aborting transaction\n");
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goto end;
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}
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status = acpi_ec_transaction_unlocked(ec, command,
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wdata, wdata_len,
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rdata, rdata_len);
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end:
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if (ec->global_lock)
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acpi_release_global_lock(glk);
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mutex_unlock(&ec->lock);
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return status;
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}
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static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data)
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{
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int result;
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u8 d;
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result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_READ,
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&address, 1, &d, 1);
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*data = d;
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return result;
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}
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static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data)
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{
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u8 wdata[2] = { address, data };
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return acpi_ec_transaction(ec, ACPI_EC_COMMAND_WRITE,
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wdata, 2, NULL, 0);
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}
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/*
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* Externally callable EC access functions. For now, assume 1 EC only
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*/
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int ec_read(u8 addr, u8 * val)
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{
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struct acpi_ec *ec;
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int err;
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u8 temp_data;
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if (!first_ec)
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return -ENODEV;
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ec = acpi_driver_data(first_ec);
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err = acpi_ec_read(ec, addr, &temp_data);
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if (!err) {
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*val = temp_data;
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return 0;
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} else
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return err;
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}
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EXPORT_SYMBOL(ec_read);
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int ec_write(u8 addr, u8 val)
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{
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struct acpi_ec *ec;
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int err;
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if (!first_ec)
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return -ENODEV;
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ec = acpi_driver_data(first_ec);
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err = acpi_ec_write(ec, addr, val);
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return err;
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}
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EXPORT_SYMBOL(ec_write);
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int ec_transaction(u8 command,
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const u8 * wdata, unsigned wdata_len,
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u8 * rdata, unsigned rdata_len)
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{
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struct acpi_ec *ec;
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if (!first_ec)
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return -ENODEV;
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ec = acpi_driver_data(first_ec);
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return acpi_ec_transaction(ec, command, wdata,
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wdata_len, rdata, rdata_len);
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}
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EXPORT_SYMBOL(ec_transaction);
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static int acpi_ec_query(struct acpi_ec *ec, u8 * data)
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{
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int result;
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u8 d;
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if (!ec || !data)
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return -EINVAL;
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/*
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* Query the EC to find out which _Qxx method we need to evaluate.
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* Note that successful completion of the query causes the ACPI_EC_SCI
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* bit to be cleared (and thus clearing the interrupt source).
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*/
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result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_QUERY, NULL, 0, &d, 1);
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if (result)
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return result;
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if (!d)
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return -ENODATA;
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*data = d;
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return 0;
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}
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/* --------------------------------------------------------------------------
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Event Management
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-------------------------------------------------------------------------- */
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static void acpi_ec_gpe_query(void *ec_cxt)
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{
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struct acpi_ec *ec = (struct acpi_ec *)ec_cxt;
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u8 value = 0;
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char object_name[8];
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if (!ec || acpi_ec_query(ec, &value))
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return;
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snprintf(object_name, 8, "_Q%2.2X", value);
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s", object_name));
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acpi_evaluate_object(ec->handle, object_name, NULL, NULL);
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}
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|
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static u32 acpi_ec_gpe_handler(void *data)
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{
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acpi_status status = AE_OK;
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u8 value;
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struct acpi_ec *ec = (struct acpi_ec *)data;
|
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|
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if (acpi_ec_mode == EC_INTR) {
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wake_up(&ec->wait);
|
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}
|
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|
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value = acpi_ec_read_status(ec);
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if ((value & ACPI_EC_FLAG_SCI) && !atomic_read(&ec->query_pending)) {
|
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atomic_set(&ec->query_pending, 1);
|
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status =
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acpi_os_execute(OSL_EC_BURST_HANDLER, acpi_ec_gpe_query,
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ec);
|
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}
|
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|
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return status == AE_OK ?
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ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
|
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}
|
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|
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/* --------------------------------------------------------------------------
|
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Address Space Management
|
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-------------------------------------------------------------------------- */
|
|
|
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static acpi_status
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acpi_ec_space_setup(acpi_handle region_handle,
|
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u32 function, void *handler_context, void **return_context)
|
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{
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/*
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* The EC object is in the handler context and is needed
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* when calling the acpi_ec_space_handler.
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*/
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*return_context = (function != ACPI_REGION_DEACTIVATE) ?
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handler_context : NULL;
|
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|
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return AE_OK;
|
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}
|
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|
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static acpi_status
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acpi_ec_space_handler(u32 function,
|
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acpi_physical_address address,
|
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u32 bit_width,
|
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acpi_integer * value,
|
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void *handler_context, void *region_context)
|
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{
|
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int result = 0;
|
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struct acpi_ec *ec = NULL;
|
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u64 temp = *value;
|
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acpi_integer f_v = 0;
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int i = 0;
|
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|
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if ((address > 0xFF) || !value || !handler_context)
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return AE_BAD_PARAMETER;
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|
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if (bit_width != 8 && acpi_strict) {
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return AE_BAD_PARAMETER;
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}
|
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|
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ec = (struct acpi_ec *)handler_context;
|
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|
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next_byte:
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switch (function) {
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case ACPI_READ:
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temp = 0;
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result = acpi_ec_read(ec, (u8) address, (u8 *) & temp);
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break;
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case ACPI_WRITE:
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result = acpi_ec_write(ec, (u8) address, (u8) temp);
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break;
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default:
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result = -EINVAL;
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goto out;
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break;
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}
|
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|
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bit_width -= 8;
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if (bit_width) {
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if (function == ACPI_READ)
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f_v |= temp << 8 * i;
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if (function == ACPI_WRITE)
|
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temp >>= 8;
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i++;
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address++;
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goto next_byte;
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}
|
|
|
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if (function == ACPI_READ) {
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f_v |= temp << 8 * i;
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*value = f_v;
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}
|
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|
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out:
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switch (result) {
|
|
case -EINVAL:
|
|
return AE_BAD_PARAMETER;
|
|
break;
|
|
case -ENODEV:
|
|
return AE_NOT_FOUND;
|
|
break;
|
|
case -ETIME:
|
|
return AE_TIME;
|
|
break;
|
|
default:
|
|
return AE_OK;
|
|
}
|
|
}
|
|
|
|
/* --------------------------------------------------------------------------
|
|
FS Interface (/proc)
|
|
-------------------------------------------------------------------------- */
|
|
|
|
static struct proc_dir_entry *acpi_ec_dir;
|
|
|
|
static int acpi_ec_read_info(struct seq_file *seq, void *offset)
|
|
{
|
|
struct acpi_ec *ec = (struct acpi_ec *)seq->private;
|
|
|
|
if (!ec)
|
|
goto end;
|
|
|
|
seq_printf(seq, "gpe: 0x%02x\n", (u32) ec->gpe);
|
|
seq_printf(seq, "ports: 0x%02x, 0x%02x\n",
|
|
(u32) ec->command_addr, (u32) ec->data_addr);
|
|
seq_printf(seq, "use global lock: %s\n",
|
|
ec->global_lock ? "yes" : "no");
|
|
acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
|
|
|
|
end:
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_ec_info_open_fs(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, acpi_ec_read_info, PDE(inode)->data);
|
|
}
|
|
|
|
static struct file_operations acpi_ec_info_ops = {
|
|
.open = acpi_ec_info_open_fs,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static int acpi_ec_add_fs(struct acpi_device *device)
|
|
{
|
|
struct proc_dir_entry *entry = NULL;
|
|
|
|
if (!acpi_device_dir(device)) {
|
|
acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
|
|
acpi_ec_dir);
|
|
if (!acpi_device_dir(device))
|
|
return -ENODEV;
|
|
}
|
|
|
|
entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO,
|
|
acpi_device_dir(device));
|
|
if (!entry)
|
|
return -ENODEV;
|
|
else {
|
|
entry->proc_fops = &acpi_ec_info_ops;
|
|
entry->data = acpi_driver_data(device);
|
|
entry->owner = THIS_MODULE;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_ec_remove_fs(struct acpi_device *device)
|
|
{
|
|
|
|
if (acpi_device_dir(device)) {
|
|
remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device));
|
|
remove_proc_entry(acpi_device_bid(device), acpi_ec_dir);
|
|
acpi_device_dir(device) = NULL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* --------------------------------------------------------------------------
|
|
Driver Interface
|
|
-------------------------------------------------------------------------- */
|
|
|
|
static int acpi_ec_add(struct acpi_device *device)
|
|
{
|
|
int result = 0;
|
|
acpi_status status = AE_OK;
|
|
struct acpi_ec *ec = NULL;
|
|
|
|
if (!device)
|
|
return -EINVAL;
|
|
|
|
ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL);
|
|
if (!ec)
|
|
return -ENOMEM;
|
|
|
|
ec->handle = device->handle;
|
|
ec->uid = -1;
|
|
mutex_init(&ec->lock);
|
|
atomic_set(&ec->query_pending, 0);
|
|
if (acpi_ec_mode == EC_INTR) {
|
|
atomic_set(&ec->leaving_burst, 1);
|
|
init_waitqueue_head(&ec->wait);
|
|
}
|
|
strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
|
|
strcpy(acpi_device_class(device), ACPI_EC_CLASS);
|
|
acpi_driver_data(device) = ec;
|
|
|
|
/* Use the global lock for all EC transactions? */
|
|
acpi_evaluate_integer(ec->handle, "_GLK", NULL, &ec->global_lock);
|
|
|
|
/* XXX we don't test uids, because on some boxes ecdt uid = 0, see:
|
|
http://bugzilla.kernel.org/show_bug.cgi?id=6111 */
|
|
if (ec_ecdt) {
|
|
acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
|
|
ACPI_ADR_SPACE_EC,
|
|
&acpi_ec_space_handler);
|
|
|
|
acpi_remove_gpe_handler(NULL, ec_ecdt->gpe,
|
|
&acpi_ec_gpe_handler);
|
|
|
|
kfree(ec_ecdt);
|
|
}
|
|
|
|
/* Get GPE bit assignment (EC events). */
|
|
/* TODO: Add support for _GPE returning a package */
|
|
status = acpi_evaluate_integer(ec->handle, "_GPE", NULL, &ec->gpe);
|
|
if (ACPI_FAILURE(status)) {
|
|
ACPI_EXCEPTION((AE_INFO, status,
|
|
"Obtaining GPE bit assignment"));
|
|
result = -ENODEV;
|
|
goto end;
|
|
}
|
|
|
|
result = acpi_ec_add_fs(device);
|
|
if (result)
|
|
goto end;
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s [%s] (gpe %d) interrupt mode.",
|
|
acpi_device_name(device), acpi_device_bid(device),
|
|
(u32) ec->gpe));
|
|
|
|
if (!first_ec)
|
|
first_ec = device;
|
|
|
|
end:
|
|
if (result)
|
|
kfree(ec);
|
|
|
|
return result;
|
|
}
|
|
|
|
static int acpi_ec_remove(struct acpi_device *device, int type)
|
|
{
|
|
struct acpi_ec *ec = NULL;
|
|
|
|
if (!device)
|
|
return -EINVAL;
|
|
|
|
ec = acpi_driver_data(device);
|
|
|
|
acpi_ec_remove_fs(device);
|
|
|
|
kfree(ec);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static acpi_status
|
|
acpi_ec_io_ports(struct acpi_resource *resource, void *context)
|
|
{
|
|
struct acpi_ec *ec = (struct acpi_ec *)context;
|
|
|
|
if (resource->type != ACPI_RESOURCE_TYPE_IO) {
|
|
return AE_OK;
|
|
}
|
|
|
|
/*
|
|
* The first address region returned is the data port, and
|
|
* the second address region returned is the status/command
|
|
* port.
|
|
*/
|
|
if (ec->data_addr == 0) {
|
|
ec->data_addr = resource->data.io.minimum;
|
|
} else if (ec->command_addr == 0) {
|
|
ec->command_addr = resource->data.io.minimum;
|
|
} else {
|
|
return AE_CTRL_TERMINATE;
|
|
}
|
|
|
|
return AE_OK;
|
|
}
|
|
|
|
static int acpi_ec_start(struct acpi_device *device)
|
|
{
|
|
acpi_status status = AE_OK;
|
|
struct acpi_ec *ec = NULL;
|
|
|
|
if (!device)
|
|
return -EINVAL;
|
|
|
|
ec = acpi_driver_data(device);
|
|
|
|
if (!ec)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Get I/O port addresses. Convert to GAS format.
|
|
*/
|
|
status = acpi_walk_resources(ec->handle, METHOD_NAME__CRS,
|
|
acpi_ec_io_ports, ec);
|
|
if (ACPI_FAILURE(status) || ec->command_addr == 0) {
|
|
ACPI_EXCEPTION((AE_INFO, status,
|
|
"Error getting I/O port addresses"));
|
|
return -ENODEV;
|
|
}
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02lx, ports=0x%2lx,0x%2lx",
|
|
ec->gpe, ec->command_addr, ec->data_addr));
|
|
|
|
/*
|
|
* Install GPE handler
|
|
*/
|
|
status = acpi_install_gpe_handler(NULL, ec->gpe,
|
|
ACPI_GPE_EDGE_TRIGGERED,
|
|
&acpi_ec_gpe_handler, ec);
|
|
if (ACPI_FAILURE(status)) {
|
|
return -ENODEV;
|
|
}
|
|
acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME);
|
|
acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
|
|
|
|
status = acpi_install_address_space_handler(ec->handle,
|
|
ACPI_ADR_SPACE_EC,
|
|
&acpi_ec_space_handler,
|
|
&acpi_ec_space_setup, ec);
|
|
if (ACPI_FAILURE(status)) {
|
|
acpi_remove_gpe_handler(NULL, ec->gpe, &acpi_ec_gpe_handler);
|
|
return -ENODEV;
|
|
}
|
|
|
|
return AE_OK;
|
|
}
|
|
|
|
static int acpi_ec_stop(struct acpi_device *device, int type)
|
|
{
|
|
acpi_status status = AE_OK;
|
|
struct acpi_ec *ec = NULL;
|
|
|
|
if (!device)
|
|
return -EINVAL;
|
|
|
|
ec = acpi_driver_data(device);
|
|
|
|
status = acpi_remove_address_space_handler(ec->handle,
|
|
ACPI_ADR_SPACE_EC,
|
|
&acpi_ec_space_handler);
|
|
if (ACPI_FAILURE(status))
|
|
return -ENODEV;
|
|
|
|
status = acpi_remove_gpe_handler(NULL, ec->gpe, &acpi_ec_gpe_handler);
|
|
if (ACPI_FAILURE(status))
|
|
return -ENODEV;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static acpi_status __init
|
|
acpi_fake_ecdt_callback(acpi_handle handle,
|
|
u32 Level, void *context, void **retval)
|
|
{
|
|
acpi_status status;
|
|
|
|
mutex_init(&ec_ecdt->lock);
|
|
if (acpi_ec_mode == EC_INTR) {
|
|
init_waitqueue_head(&ec_ecdt->wait);
|
|
}
|
|
status = acpi_walk_resources(handle, METHOD_NAME__CRS,
|
|
acpi_ec_io_ports, ec_ecdt);
|
|
if (ACPI_FAILURE(status))
|
|
return status;
|
|
|
|
ec_ecdt->uid = -1;
|
|
acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->uid);
|
|
|
|
status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec_ecdt->gpe);
|
|
if (ACPI_FAILURE(status))
|
|
return status;
|
|
ec_ecdt->global_lock = TRUE;
|
|
ec_ecdt->handle = handle;
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "GPE=0x%02lx, ports=0x%2lx, 0x%2lx",
|
|
ec_ecdt->gpe, ec_ecdt->command_addr,
|
|
ec_ecdt->data_addr));
|
|
|
|
return AE_CTRL_TERMINATE;
|
|
}
|
|
|
|
/*
|
|
* Some BIOS (such as some from Gateway laptops) access EC region very early
|
|
* such as in BAT0._INI or EC._INI before an EC device is found and
|
|
* do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily
|
|
* required, but if EC regison is accessed early, it is required.
|
|
* The routine tries to workaround the BIOS bug by pre-scan EC device
|
|
* It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any
|
|
* op region (since _REG isn't invoked yet). The assumption is true for
|
|
* all systems found.
|
|
*/
|
|
static int __init acpi_ec_fake_ecdt(void)
|
|
{
|
|
acpi_status status;
|
|
int ret = 0;
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Try to make an fake ECDT"));
|
|
|
|
ec_ecdt = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL);
|
|
if (!ec_ecdt) {
|
|
ret = -ENOMEM;
|
|
goto error;
|
|
}
|
|
|
|
status = acpi_get_devices(ACPI_EC_HID,
|
|
acpi_fake_ecdt_callback, NULL, NULL);
|
|
if (ACPI_FAILURE(status)) {
|
|
kfree(ec_ecdt);
|
|
ec_ecdt = NULL;
|
|
ret = -ENODEV;
|
|
ACPI_EXCEPTION((AE_INFO, status, "Can't make an fake ECDT"));
|
|
goto error;
|
|
}
|
|
return 0;
|
|
error:
|
|
return ret;
|
|
}
|
|
|
|
static int __init acpi_ec_get_real_ecdt(void)
|
|
{
|
|
acpi_status status;
|
|
struct acpi_table_ecdt *ecdt_ptr;
|
|
|
|
status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
|
|
(struct acpi_table_header **)
|
|
&ecdt_ptr);
|
|
if (ACPI_FAILURE(status))
|
|
return -ENODEV;
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found ECDT"));
|
|
|
|
/*
|
|
* Generate a temporary ec context to use until the namespace is scanned
|
|
*/
|
|
ec_ecdt = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL);
|
|
if (!ec_ecdt)
|
|
return -ENOMEM;
|
|
|
|
mutex_init(&ec_ecdt->lock);
|
|
if (acpi_ec_mode == EC_INTR) {
|
|
init_waitqueue_head(&ec_ecdt->wait);
|
|
}
|
|
ec_ecdt->command_addr = ecdt_ptr->ec_control.address;
|
|
ec_ecdt->data_addr = ecdt_ptr->ec_data.address;
|
|
ec_ecdt->gpe = ecdt_ptr->gpe_bit;
|
|
/* use the GL just to be safe */
|
|
ec_ecdt->global_lock = TRUE;
|
|
ec_ecdt->uid = ecdt_ptr->uid;
|
|
|
|
status = acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->handle);
|
|
if (ACPI_FAILURE(status)) {
|
|
goto error;
|
|
}
|
|
|
|
return 0;
|
|
error:
|
|
ACPI_EXCEPTION((AE_INFO, status, "Could not use ECDT"));
|
|
kfree(ec_ecdt);
|
|
ec_ecdt = NULL;
|
|
|
|
return -ENODEV;
|
|
}
|
|
|
|
static int __initdata acpi_fake_ecdt_enabled;
|
|
int __init acpi_ec_ecdt_probe(void)
|
|
{
|
|
acpi_status status;
|
|
int ret;
|
|
|
|
ret = acpi_ec_get_real_ecdt();
|
|
/* Try to make a fake ECDT */
|
|
if (ret && acpi_fake_ecdt_enabled) {
|
|
ret = acpi_ec_fake_ecdt();
|
|
}
|
|
|
|
if (ret)
|
|
return 0;
|
|
|
|
/*
|
|
* Install GPE handler
|
|
*/
|
|
status = acpi_install_gpe_handler(NULL, ec_ecdt->gpe,
|
|
ACPI_GPE_EDGE_TRIGGERED,
|
|
&acpi_ec_gpe_handler, ec_ecdt);
|
|
if (ACPI_FAILURE(status)) {
|
|
goto error;
|
|
}
|
|
acpi_set_gpe_type(NULL, ec_ecdt->gpe, ACPI_GPE_TYPE_RUNTIME);
|
|
acpi_enable_gpe(NULL, ec_ecdt->gpe, ACPI_NOT_ISR);
|
|
|
|
status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT,
|
|
ACPI_ADR_SPACE_EC,
|
|
&acpi_ec_space_handler,
|
|
&acpi_ec_space_setup,
|
|
ec_ecdt);
|
|
if (ACPI_FAILURE(status)) {
|
|
acpi_remove_gpe_handler(NULL, ec_ecdt->gpe,
|
|
&acpi_ec_gpe_handler);
|
|
goto error;
|
|
}
|
|
|
|
return 0;
|
|
|
|
error:
|
|
ACPI_EXCEPTION((AE_INFO, status, "Could not use ECDT"));
|
|
kfree(ec_ecdt);
|
|
ec_ecdt = NULL;
|
|
|
|
return -ENODEV;
|
|
}
|
|
|
|
static int __init acpi_ec_init(void)
|
|
{
|
|
int result = 0;
|
|
|
|
if (acpi_disabled)
|
|
return 0;
|
|
|
|
acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir);
|
|
if (!acpi_ec_dir)
|
|
return -ENODEV;
|
|
|
|
/* Now register the driver for the EC */
|
|
result = acpi_bus_register_driver(&acpi_ec_driver);
|
|
if (result < 0) {
|
|
remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
|
|
return -ENODEV;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
subsys_initcall(acpi_ec_init);
|
|
|
|
/* EC driver currently not unloadable */
|
|
#if 0
|
|
static void __exit acpi_ec_exit(void)
|
|
{
|
|
|
|
acpi_bus_unregister_driver(&acpi_ec_driver);
|
|
|
|
remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
|
|
|
|
return;
|
|
}
|
|
#endif /* 0 */
|
|
|
|
static int __init acpi_fake_ecdt_setup(char *str)
|
|
{
|
|
acpi_fake_ecdt_enabled = 1;
|
|
return 1;
|
|
}
|
|
|
|
__setup("acpi_fake_ecdt", acpi_fake_ecdt_setup);
|
|
static int __init acpi_ec_set_intr_mode(char *str)
|
|
{
|
|
int intr;
|
|
|
|
if (!get_option(&str, &intr))
|
|
return 0;
|
|
|
|
if (intr) {
|
|
acpi_ec_mode = EC_INTR;
|
|
} else {
|
|
acpi_ec_mode = EC_POLL;
|
|
}
|
|
acpi_ec_driver.ops.add = acpi_ec_add;
|
|
printk(KERN_NOTICE PREFIX "%s mode.\n",
|
|
intr ? "interrupt" : "polling");
|
|
|
|
return 1;
|
|
}
|
|
|
|
__setup("ec_intr=", acpi_ec_set_intr_mode);
|