![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
1025 lines
23 KiB
C
1025 lines
23 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 <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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#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_SCI 0x20 /* EC-SCI occurred */
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#define ACPI_EC_EVENT_OBF 0x01 /* Output buffer full */
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#define ACPI_EC_EVENT_IBE 0x02 /* Input buffer empty */
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#define ACPI_EC_UDELAY 100 /* Poll @ 100us increments */
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#define ACPI_EC_UDELAY_COUNT 1000 /* Wait 10ms 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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#define ACPI_EC_COMMAND_READ 0x80
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#define ACPI_EC_COMMAND_WRITE 0x81
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#define ACPI_EC_COMMAND_QUERY 0x84
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static int acpi_ec_add (struct acpi_device *device);
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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 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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struct acpi_ec {
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acpi_handle handle;
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unsigned long uid;
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unsigned long gpe_bit;
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struct acpi_generic_address status_addr;
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struct acpi_generic_address command_addr;
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struct acpi_generic_address data_addr;
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unsigned long global_lock;
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spinlock_t lock;
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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 *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 int
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acpi_ec_wait (
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struct acpi_ec *ec,
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u8 event)
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{
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u32 acpi_ec_status = 0;
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u32 i = ACPI_EC_UDELAY_COUNT;
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if (!ec)
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return -EINVAL;
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/* Poll the EC status register waiting for the event to occur. */
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switch (event) {
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case ACPI_EC_EVENT_OBF:
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do {
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acpi_hw_low_level_read(8, &acpi_ec_status, &ec->status_addr);
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if (acpi_ec_status & ACPI_EC_FLAG_OBF)
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return 0;
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udelay(ACPI_EC_UDELAY);
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} while (--i>0);
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break;
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case ACPI_EC_EVENT_IBE:
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do {
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acpi_hw_low_level_read(8, &acpi_ec_status, &ec->status_addr);
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if (!(acpi_ec_status & ACPI_EC_FLAG_IBF))
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return 0;
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udelay(ACPI_EC_UDELAY);
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} while (--i>0);
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break;
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default:
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return -EINVAL;
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}
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return -ETIME;
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}
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static int
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acpi_ec_read (
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struct acpi_ec *ec,
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u8 address,
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u32 *data)
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{
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acpi_status status = AE_OK;
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int result = 0;
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unsigned long flags = 0;
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u32 glk = 0;
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ACPI_FUNCTION_TRACE("acpi_ec_read");
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if (!ec || !data)
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return_VALUE(-EINVAL);
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*data = 0;
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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_VALUE(-ENODEV);
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}
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spin_lock_irqsave(&ec->lock, flags);
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acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ, &ec->command_addr);
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result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
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if (result)
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goto end;
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acpi_hw_low_level_write(8, address, &ec->data_addr);
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result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
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if (result)
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goto end;
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acpi_hw_low_level_read(8, data, &ec->data_addr);
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n",
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*data, address));
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end:
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spin_unlock_irqrestore(&ec->lock, flags);
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if (ec->global_lock)
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acpi_release_global_lock(glk);
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return_VALUE(result);
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}
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static int
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acpi_ec_write (
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struct acpi_ec *ec,
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u8 address,
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u8 data)
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{
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int result = 0;
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acpi_status status = AE_OK;
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unsigned long flags = 0;
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u32 glk = 0;
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ACPI_FUNCTION_TRACE("acpi_ec_write");
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if (!ec)
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return_VALUE(-EINVAL);
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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_VALUE(-ENODEV);
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}
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spin_lock_irqsave(&ec->lock, flags);
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acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE, &ec->command_addr);
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result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
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if (result)
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goto end;
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acpi_hw_low_level_write(8, address, &ec->data_addr);
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result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
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if (result)
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goto end;
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acpi_hw_low_level_write(8, data, &ec->data_addr);
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result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
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if (result)
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goto end;
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n",
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data, address));
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end:
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spin_unlock_irqrestore(&ec->lock, flags);
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if (ec->global_lock)
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acpi_release_global_lock(glk);
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return_VALUE(result);
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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
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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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u32 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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}
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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
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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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static int
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acpi_ec_query (
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struct acpi_ec *ec,
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u32 *data)
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{
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int result = 0;
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acpi_status status = AE_OK;
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unsigned long flags = 0;
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u32 glk = 0;
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ACPI_FUNCTION_TRACE("acpi_ec_query");
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if (!ec || !data)
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return_VALUE(-EINVAL);
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*data = 0;
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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_VALUE(-ENODEV);
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}
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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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spin_lock_irqsave(&ec->lock, flags);
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acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY, &ec->command_addr);
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result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
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if (result)
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goto end;
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acpi_hw_low_level_read(8, data, &ec->data_addr);
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if (!*data)
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result = -ENODATA;
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end:
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spin_unlock_irqrestore(&ec->lock, flags);
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if (ec->global_lock)
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acpi_release_global_lock(glk);
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return_VALUE(result);
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}
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/* --------------------------------------------------------------------------
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Event Management
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-------------------------------------------------------------------------- */
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struct acpi_ec_query_data {
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acpi_handle handle;
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u8 data;
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};
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static void
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acpi_ec_gpe_query (
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void *ec_cxt)
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{
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struct acpi_ec *ec = (struct acpi_ec *) ec_cxt;
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u32 value = 0;
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unsigned long flags = 0;
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static char object_name[5] = {'_','Q','0','0','\0'};
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const char hex[] = {'0','1','2','3','4','5','6','7',
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'8','9','A','B','C','D','E','F'};
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ACPI_FUNCTION_TRACE("acpi_ec_gpe_query");
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if (!ec_cxt)
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goto end;
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spin_lock_irqsave(&ec->lock, flags);
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acpi_hw_low_level_read(8, &value, &ec->command_addr);
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spin_unlock_irqrestore(&ec->lock, flags);
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/* TBD: Implement asynch events!
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* NOTE: All we care about are EC-SCI's. Other EC events are
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* handled via polling (yuck!). This is because some systems
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* treat EC-SCIs as level (versus EDGE!) triggered, preventing
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* a purely interrupt-driven approach (grumble, grumble).
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*/
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if (!(value & ACPI_EC_FLAG_SCI))
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goto end;
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if (acpi_ec_query(ec, &value))
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goto end;
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object_name[2] = hex[((value >> 4) & 0x0F)];
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object_name[3] = hex[(value & 0x0F)];
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name));
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acpi_evaluate_object(ec->handle, object_name, NULL, NULL);
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end:
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acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
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}
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static u32
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acpi_ec_gpe_handler (
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void *data)
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{
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acpi_status status = AE_OK;
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struct acpi_ec *ec = (struct acpi_ec *) data;
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if (!ec)
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return ACPI_INTERRUPT_NOT_HANDLED;
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acpi_disable_gpe(NULL, ec->gpe_bit, ACPI_ISR);
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status = acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
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acpi_ec_gpe_query, ec);
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if (status == AE_OK)
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return ACPI_INTERRUPT_HANDLED;
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else
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return 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 (
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acpi_handle region_handle,
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u32 function,
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void *handler_context,
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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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if(function == ACPI_REGION_DEACTIVATE)
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*return_context = NULL;
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else
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*return_context = handler_context;
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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 (
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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,
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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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u32 temp = 0;
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acpi_integer f_v = 0;
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int i = 0;
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|
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ACPI_FUNCTION_TRACE("acpi_ec_space_handler");
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if ((address > 0xFF) || !value || !handler_context)
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return_VALUE(AE_BAD_PARAMETER);
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|
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if(bit_width != 8) {
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printk(KERN_WARNING PREFIX "acpi_ec_space_handler: bit_width should be 8\n");
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if (acpi_strict)
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return_VALUE(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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result = acpi_ec_read(ec, (u8) address, &temp);
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*value = (acpi_integer) 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) *value);
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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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bit_width -= 8;
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if(bit_width){
|
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|
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if(function == ACPI_READ)
|
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f_v |= (acpi_integer) (*value) << 8*i;
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if(function == ACPI_WRITE)
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(*value) >>=8;
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i++;
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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 |= (acpi_integer) (*value) << 8*i;
|
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*value = f_v;
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}
|
|
|
|
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out:
|
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switch (result) {
|
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case -EINVAL:
|
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return_VALUE(AE_BAD_PARAMETER);
|
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break;
|
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case -ENODEV:
|
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return_VALUE(AE_NOT_FOUND);
|
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break;
|
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case -ETIME:
|
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return_VALUE(AE_TIME);
|
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break;
|
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default:
|
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return_VALUE(AE_OK);
|
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}
|
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|
|
|
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}
|
|
|
|
|
|
/* --------------------------------------------------------------------------
|
|
FS Interface (/proc)
|
|
-------------------------------------------------------------------------- */
|
|
|
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static struct proc_dir_entry *acpi_ec_dir;
|
|
|
|
|
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static int
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acpi_ec_read_info (struct seq_file *seq, void *offset)
|
|
{
|
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struct acpi_ec *ec = (struct acpi_ec *) seq->private;
|
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|
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ACPI_FUNCTION_TRACE("acpi_ec_read_info");
|
|
|
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if (!ec)
|
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goto end;
|
|
|
|
seq_printf(seq, "gpe bit: 0x%02x\n",
|
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(u32) ec->gpe_bit);
|
|
seq_printf(seq, "ports: 0x%02x, 0x%02x\n",
|
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(u32) ec->status_addr.address, (u32) ec->data_addr.address);
|
|
seq_printf(seq, "use global lock: %s\n",
|
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ec->global_lock?"yes":"no");
|
|
|
|
end:
|
|
return_VALUE(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;
|
|
|
|
ACPI_FUNCTION_TRACE("acpi_ec_add_fs");
|
|
|
|
if (!acpi_device_dir(device)) {
|
|
acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
|
|
acpi_ec_dir);
|
|
if (!acpi_device_dir(device))
|
|
return_VALUE(-ENODEV);
|
|
}
|
|
|
|
entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO,
|
|
acpi_device_dir(device));
|
|
if (!entry)
|
|
ACPI_DEBUG_PRINT((ACPI_DB_WARN,
|
|
"Unable to create '%s' fs entry\n",
|
|
ACPI_EC_FILE_INFO));
|
|
else {
|
|
entry->proc_fops = &acpi_ec_info_ops;
|
|
entry->data = acpi_driver_data(device);
|
|
entry->owner = THIS_MODULE;
|
|
}
|
|
|
|
return_VALUE(0);
|
|
}
|
|
|
|
|
|
static int
|
|
acpi_ec_remove_fs (
|
|
struct acpi_device *device)
|
|
{
|
|
ACPI_FUNCTION_TRACE("acpi_ec_remove_fs");
|
|
|
|
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_VALUE(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;
|
|
unsigned long uid;
|
|
|
|
ACPI_FUNCTION_TRACE("acpi_ec_add");
|
|
|
|
if (!device)
|
|
return_VALUE(-EINVAL);
|
|
|
|
ec = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL);
|
|
if (!ec)
|
|
return_VALUE(-ENOMEM);
|
|
memset(ec, 0, sizeof(struct acpi_ec));
|
|
|
|
ec->handle = device->handle;
|
|
ec->uid = -1;
|
|
spin_lock_init(&ec->lock);
|
|
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);
|
|
|
|
/* If our UID matches the UID for the ECDT-enumerated EC,
|
|
we now have the *real* EC info, so kill the makeshift one.*/
|
|
acpi_evaluate_integer(ec->handle, "_UID", NULL, &uid);
|
|
if (ec_ecdt && ec_ecdt->uid == uid) {
|
|
acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
|
|
ACPI_ADR_SPACE_EC, &acpi_ec_space_handler);
|
|
|
|
acpi_remove_gpe_handler(NULL, ec_ecdt->gpe_bit, &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_bit);
|
|
if (ACPI_FAILURE(status)) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
|
|
"Error obtaining GPE bit assignment\n"));
|
|
result = -ENODEV;
|
|
goto end;
|
|
}
|
|
|
|
result = acpi_ec_add_fs(device);
|
|
if (result)
|
|
goto end;
|
|
|
|
printk(KERN_INFO PREFIX "%s [%s] (gpe %d)\n",
|
|
acpi_device_name(device), acpi_device_bid(device),
|
|
(u32) ec->gpe_bit);
|
|
|
|
if (!first_ec)
|
|
first_ec = device;
|
|
|
|
end:
|
|
if (result)
|
|
kfree(ec);
|
|
|
|
return_VALUE(result);
|
|
}
|
|
|
|
|
|
static int
|
|
acpi_ec_remove (
|
|
struct acpi_device *device,
|
|
int type)
|
|
{
|
|
struct acpi_ec *ec = NULL;
|
|
|
|
ACPI_FUNCTION_TRACE("acpi_ec_remove");
|
|
|
|
if (!device)
|
|
return_VALUE(-EINVAL);
|
|
|
|
ec = acpi_driver_data(device);
|
|
|
|
acpi_ec_remove_fs(device);
|
|
|
|
kfree(ec);
|
|
|
|
return_VALUE(0);
|
|
}
|
|
|
|
|
|
static acpi_status
|
|
acpi_ec_io_ports (
|
|
struct acpi_resource *resource,
|
|
void *context)
|
|
{
|
|
struct acpi_ec *ec = (struct acpi_ec *) context;
|
|
struct acpi_generic_address *addr;
|
|
|
|
if (resource->id != ACPI_RSTYPE_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.register_bit_width == 0) {
|
|
addr = &ec->data_addr;
|
|
} else if (ec->command_addr.register_bit_width == 0) {
|
|
addr = &ec->command_addr;
|
|
} else {
|
|
return AE_CTRL_TERMINATE;
|
|
}
|
|
|
|
addr->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO;
|
|
addr->register_bit_width = 8;
|
|
addr->register_bit_offset = 0;
|
|
addr->address = resource->data.io.min_base_address;
|
|
|
|
return AE_OK;
|
|
}
|
|
|
|
|
|
static int
|
|
acpi_ec_start (
|
|
struct acpi_device *device)
|
|
{
|
|
acpi_status status = AE_OK;
|
|
struct acpi_ec *ec = NULL;
|
|
|
|
ACPI_FUNCTION_TRACE("acpi_ec_start");
|
|
|
|
if (!device)
|
|
return_VALUE(-EINVAL);
|
|
|
|
ec = acpi_driver_data(device);
|
|
|
|
if (!ec)
|
|
return_VALUE(-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.register_bit_width == 0) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error getting I/O port addresses"));
|
|
return_VALUE(-ENODEV);
|
|
}
|
|
|
|
ec->status_addr = ec->command_addr;
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02x, ports=0x%2x,0x%2x\n",
|
|
(u32) ec->gpe_bit, (u32) ec->command_addr.address,
|
|
(u32) ec->data_addr.address));
|
|
|
|
/*
|
|
* Install GPE handler
|
|
*/
|
|
status = acpi_install_gpe_handler(NULL, ec->gpe_bit,
|
|
ACPI_GPE_EDGE_TRIGGERED, &acpi_ec_gpe_handler, ec);
|
|
if (ACPI_FAILURE(status)) {
|
|
return_VALUE(-ENODEV);
|
|
}
|
|
acpi_set_gpe_type (NULL, ec->gpe_bit, ACPI_GPE_TYPE_RUNTIME);
|
|
acpi_enable_gpe (NULL, ec->gpe_bit, 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_bit, &acpi_ec_gpe_handler);
|
|
return_VALUE(-ENODEV);
|
|
}
|
|
|
|
return_VALUE(AE_OK);
|
|
}
|
|
|
|
|
|
static int
|
|
acpi_ec_stop (
|
|
struct acpi_device *device,
|
|
int type)
|
|
{
|
|
acpi_status status = AE_OK;
|
|
struct acpi_ec *ec = NULL;
|
|
|
|
ACPI_FUNCTION_TRACE("acpi_ec_stop");
|
|
|
|
if (!device)
|
|
return_VALUE(-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_VALUE(-ENODEV);
|
|
|
|
status = acpi_remove_gpe_handler(NULL, ec->gpe_bit, &acpi_ec_gpe_handler);
|
|
if (ACPI_FAILURE(status))
|
|
return_VALUE(-ENODEV);
|
|
|
|
return_VALUE(0);
|
|
}
|
|
|
|
static acpi_status __init
|
|
acpi_fake_ecdt_callback (
|
|
acpi_handle handle,
|
|
u32 Level,
|
|
void *context,
|
|
void **retval)
|
|
{
|
|
acpi_status status;
|
|
|
|
status = acpi_walk_resources(handle, METHOD_NAME__CRS,
|
|
acpi_ec_io_ports, ec_ecdt);
|
|
if (ACPI_FAILURE(status))
|
|
return status;
|
|
ec_ecdt->status_addr = ec_ecdt->command_addr;
|
|
|
|
ec_ecdt->uid = -1;
|
|
acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->uid);
|
|
|
|
status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec_ecdt->gpe_bit);
|
|
if (ACPI_FAILURE(status))
|
|
return status;
|
|
spin_lock_init(&ec_ecdt->lock);
|
|
ec_ecdt->global_lock = TRUE;
|
|
ec_ecdt->handle = handle;
|
|
|
|
printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n",
|
|
(u32) ec_ecdt->gpe_bit, (u32) ec_ecdt->command_addr.address,
|
|
(u32) ec_ecdt->data_addr.address);
|
|
|
|
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;
|
|
|
|
printk(KERN_INFO PREFIX "Try to make an fake ECDT\n");
|
|
|
|
ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL);
|
|
if (!ec_ecdt) {
|
|
ret = -ENOMEM;
|
|
goto error;
|
|
}
|
|
memset(ec_ecdt, 0, sizeof(struct acpi_ec));
|
|
|
|
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;
|
|
goto error;
|
|
}
|
|
return 0;
|
|
error:
|
|
printk(KERN_ERR PREFIX "Can't make an fake ECDT\n");
|
|
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;
|
|
|
|
printk(KERN_INFO PREFIX "Found ECDT\n");
|
|
|
|
/*
|
|
* Generate a temporary ec context to use until the namespace is scanned
|
|
*/
|
|
ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL);
|
|
if (!ec_ecdt)
|
|
return -ENOMEM;
|
|
memset(ec_ecdt, 0, sizeof(struct acpi_ec));
|
|
|
|
ec_ecdt->command_addr = ecdt_ptr->ec_control;
|
|
ec_ecdt->status_addr = ecdt_ptr->ec_control;
|
|
ec_ecdt->data_addr = ecdt_ptr->ec_data;
|
|
ec_ecdt->gpe_bit = ecdt_ptr->gpe_bit;
|
|
spin_lock_init(&ec_ecdt->lock);
|
|
/* 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:
|
|
printk(KERN_ERR PREFIX "Could not use ECDT\n");
|
|
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_bit,
|
|
ACPI_GPE_EDGE_TRIGGERED, &acpi_ec_gpe_handler,
|
|
ec_ecdt);
|
|
if (ACPI_FAILURE(status)) {
|
|
goto error;
|
|
}
|
|
acpi_set_gpe_type (NULL, ec_ecdt->gpe_bit, ACPI_GPE_TYPE_RUNTIME);
|
|
acpi_enable_gpe (NULL, ec_ecdt->gpe_bit, 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_bit,
|
|
&acpi_ec_gpe_handler);
|
|
goto error;
|
|
}
|
|
|
|
return 0;
|
|
|
|
error:
|
|
printk(KERN_ERR PREFIX "Could not use ECDT\n");
|
|
kfree(ec_ecdt);
|
|
ec_ecdt = NULL;
|
|
|
|
return -ENODEV;
|
|
}
|
|
|
|
|
|
static int __init acpi_ec_init (void)
|
|
{
|
|
int result = 0;
|
|
|
|
ACPI_FUNCTION_TRACE("acpi_ec_init");
|
|
|
|
if (acpi_disabled)
|
|
return_VALUE(0);
|
|
|
|
acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir);
|
|
if (!acpi_ec_dir)
|
|
return_VALUE(-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_VALUE(-ENODEV);
|
|
}
|
|
|
|
return_VALUE(result);
|
|
}
|
|
|
|
subsys_initcall(acpi_ec_init);
|
|
|
|
/* EC driver currently not unloadable */
|
|
#if 0
|
|
static void __exit
|
|
acpi_ec_exit (void)
|
|
{
|
|
ACPI_FUNCTION_TRACE("acpi_ec_exit");
|
|
|
|
acpi_bus_unregister_driver(&acpi_ec_driver);
|
|
|
|
remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
|
|
|
|
return_VOID;
|
|
}
|
|
#endif /* 0 */
|
|
|
|
static int __init acpi_fake_ecdt_setup(char *str)
|
|
{
|
|
acpi_fake_ecdt_enabled = 1;
|
|
return 0;
|
|
}
|
|
__setup("acpi_fake_ecdt", acpi_fake_ecdt_setup);
|