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1010 lines
25 KiB
C
1010 lines
25 KiB
C
/*
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* ec.c - ACPI Embedded Controller Driver (v2.0)
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*
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* Copyright (C) 2006, 2007 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
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* Copyright (C) 2006 Denis Sadykov <denis.m.sadykov@intel.com>
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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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/* Uncomment next line to get verbose print outs*/
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/* #define DEBUG */
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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 <linux/list.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 ACPI_EC_CLASS "embedded_controller"
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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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enum {
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EC_FLAGS_WAIT_GPE = 0, /* Don't check status until GPE arrives */
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EC_FLAGS_QUERY_PENDING, /* Query is pending */
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EC_FLAGS_GPE_MODE, /* Expect GPE to be sent for status change */
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EC_FLAGS_NO_ADDRESS_GPE, /* Expect GPE only for non-address event */
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EC_FLAGS_ADDRESS, /* Address is being written */
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EC_FLAGS_NO_WDATA_GPE, /* Don't expect WDATA GPE event */
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EC_FLAGS_WDATA, /* Data is being written */
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EC_FLAGS_NO_OBF1_GPE, /* Don't expect GPE before read */
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};
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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 const struct acpi_device_id ec_device_ids[] = {
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{"PNP0C09", 0},
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{"", 0},
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};
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static struct acpi_driver acpi_ec_driver = {
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.name = "ec",
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.class = ACPI_EC_CLASS,
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.ids = ec_device_ids,
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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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/* External interfaces use first EC only, so remember */
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typedef int (*acpi_ec_query_func) (void *data);
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struct acpi_ec_query_handler {
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struct list_head node;
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acpi_ec_query_func func;
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acpi_handle handle;
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void *data;
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u8 query_bit;
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};
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static struct acpi_ec {
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acpi_handle handle;
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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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unsigned long flags;
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struct mutex lock;
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wait_queue_head_t wait;
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struct list_head list;
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u8 handlers_installed;
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} *boot_ec, *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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u8 x = inb(ec->command_addr);
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pr_debug(PREFIX "---> status = 0x%2.2x\n", x);
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return x;
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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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u8 x = inb(ec->data_addr);
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pr_debug(PREFIX "---> data = 0x%2.2x\n", x);
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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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pr_debug(PREFIX "<--- command = 0x%2.2x\n", command);
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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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pr_debug(PREFIX "<--- data = 0x%2.2x\n", data);
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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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if (test_bit(EC_FLAGS_WAIT_GPE, &ec->flags))
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return 0;
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if (event == ACPI_EC_EVENT_OBF_1) {
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if (acpi_ec_read_status(ec) & 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 (!(acpi_ec_read_status(ec) & 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, int force_poll)
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{
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int ret = 0;
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if (unlikely(event == ACPI_EC_EVENT_OBF_1 &&
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test_bit(EC_FLAGS_NO_OBF1_GPE, &ec->flags)))
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force_poll = 1;
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if (unlikely(test_bit(EC_FLAGS_ADDRESS, &ec->flags) &&
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test_bit(EC_FLAGS_NO_ADDRESS_GPE, &ec->flags)))
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force_poll = 1;
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if (unlikely(test_bit(EC_FLAGS_WDATA, &ec->flags) &&
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test_bit(EC_FLAGS_NO_WDATA_GPE, &ec->flags)))
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force_poll = 1;
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if (likely(test_bit(EC_FLAGS_GPE_MODE, &ec->flags)) &&
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likely(!force_poll)) {
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if (wait_event_timeout(ec->wait, acpi_ec_check_status(ec, event),
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msecs_to_jiffies(ACPI_EC_DELAY)))
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goto end;
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clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
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if (acpi_ec_check_status(ec, event)) {
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if (event == ACPI_EC_EVENT_OBF_1) {
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/* miss OBF_1 GPE, don't expect it */
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pr_info(PREFIX "missing OBF confirmation, "
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"don't expect it any longer.\n");
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set_bit(EC_FLAGS_NO_OBF1_GPE, &ec->flags);
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} else if (test_bit(EC_FLAGS_ADDRESS, &ec->flags)) {
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/* miss address GPE, don't expect it anymore */
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pr_info(PREFIX "missing address confirmation, "
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"don't expect it any longer.\n");
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set_bit(EC_FLAGS_NO_ADDRESS_GPE, &ec->flags);
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} else if (test_bit(EC_FLAGS_WDATA, &ec->flags)) {
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/* miss write data GPE, don't expect it */
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pr_info(PREFIX "missing write data confirmation, "
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"don't expect it any longer.\n");
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set_bit(EC_FLAGS_NO_WDATA_GPE, &ec->flags);
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} else {
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/* missing GPEs, switch back to poll mode */
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if (printk_ratelimit())
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pr_info(PREFIX "missing confirmations, "
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"switch off interrupt mode.\n");
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clear_bit(EC_FLAGS_GPE_MODE, &ec->flags);
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}
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goto end;
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}
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} else {
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unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY);
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clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
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while (time_before(jiffies, delay)) {
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if (acpi_ec_check_status(ec, event))
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goto end;
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}
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}
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pr_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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ret = -ETIME;
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end:
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clear_bit(EC_FLAGS_ADDRESS, &ec->flags);
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return ret;
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}
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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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int force_poll)
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{
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int result = 0;
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set_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
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acpi_ec_write_cmd(ec, command);
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pr_debug(PREFIX "transaction start\n");
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for (; wdata_len > 0; --wdata_len) {
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result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, force_poll);
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if (result) {
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pr_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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/* mark the address byte written to EC */
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if (rdata_len + wdata_len > 1)
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set_bit(EC_FLAGS_ADDRESS, &ec->flags);
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set_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
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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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set_bit(EC_FLAGS_WDATA, &ec->flags);
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result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, force_poll);
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if (result) {
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pr_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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clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
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for (; rdata_len > 0; --rdata_len) {
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result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1, force_poll);
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if (result) {
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pr_err(PREFIX "read timeout, command = %d\n", command);
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goto end;
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}
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/* Don't expect GPE after last read */
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if (rdata_len > 1)
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set_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
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*(rdata++) = acpi_ec_read_data(ec);
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}
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end:
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pr_debug(PREFIX "transaction end\n");
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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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int force_poll)
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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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mutex_unlock(&ec->lock);
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return -ENODEV;
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}
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}
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status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, 0);
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if (status) {
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pr_err(PREFIX "input buffer is not empty, "
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"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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force_poll);
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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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/*
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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_burst_enable(struct acpi_ec *ec)
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{
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u8 d;
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return acpi_ec_transaction(ec, ACPI_EC_BURST_ENABLE, NULL, 0, &d, 1, 0);
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}
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int acpi_ec_burst_disable(struct acpi_ec *ec)
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{
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return acpi_ec_transaction(ec, ACPI_EC_BURST_DISABLE, NULL, 0, NULL, 0, 0);
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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, 0);
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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, 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_burst_enable(void)
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{
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if (!first_ec)
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return -ENODEV;
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return acpi_ec_burst_enable(first_ec);
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}
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EXPORT_SYMBOL(ec_burst_enable);
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int ec_burst_disable(void)
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{
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if (!first_ec)
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return -ENODEV;
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return acpi_ec_burst_disable(first_ec);
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}
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EXPORT_SYMBOL(ec_burst_disable);
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int ec_read(u8 addr, u8 * val)
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{
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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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err = acpi_ec_read(first_ec, addr, &temp_data);
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|
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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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|
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EXPORT_SYMBOL(ec_read);
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|
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int ec_write(u8 addr, u8 val)
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{
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int err;
|
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|
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if (!first_ec)
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return -ENODEV;
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|
|
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err = acpi_ec_write(first_ec, addr, val);
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|
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return err;
|
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}
|
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|
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EXPORT_SYMBOL(ec_write);
|
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|
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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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int force_poll)
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{
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if (!first_ec)
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return -ENODEV;
|
|
|
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return acpi_ec_transaction(first_ec, command, wdata,
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wdata_len, rdata, rdata_len,
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force_poll);
|
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}
|
|
|
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EXPORT_SYMBOL(ec_transaction);
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|
|
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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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|
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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, 0);
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if (result)
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return result;
|
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|
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if (!d)
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return -ENODATA;
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|
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*data = d;
|
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return 0;
|
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}
|
|
|
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/* --------------------------------------------------------------------------
|
|
Event Management
|
|
-------------------------------------------------------------------------- */
|
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int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit,
|
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acpi_handle handle, acpi_ec_query_func func,
|
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void *data)
|
|
{
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struct acpi_ec_query_handler *handler =
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kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL);
|
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if (!handler)
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return -ENOMEM;
|
|
|
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handler->query_bit = query_bit;
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handler->handle = handle;
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handler->func = func;
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handler->data = data;
|
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mutex_lock(&ec->lock);
|
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list_add(&handler->node, &ec->list);
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mutex_unlock(&ec->lock);
|
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return 0;
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}
|
|
|
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EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler);
|
|
|
|
void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit)
|
|
{
|
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struct acpi_ec_query_handler *handler, *tmp;
|
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mutex_lock(&ec->lock);
|
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list_for_each_entry_safe(handler, tmp, &ec->list, node) {
|
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if (query_bit == handler->query_bit) {
|
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list_del(&handler->node);
|
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kfree(handler);
|
|
}
|
|
}
|
|
mutex_unlock(&ec->lock);
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler);
|
|
|
|
static void acpi_ec_gpe_query(void *ec_cxt)
|
|
{
|
|
struct acpi_ec *ec = ec_cxt;
|
|
u8 value = 0;
|
|
struct acpi_ec_query_handler *handler, copy;
|
|
|
|
if (!ec || acpi_ec_query(ec, &value))
|
|
return;
|
|
mutex_lock(&ec->lock);
|
|
list_for_each_entry(handler, &ec->list, node) {
|
|
if (value == handler->query_bit) {
|
|
/* have custom handler for this bit */
|
|
memcpy(©, handler, sizeof(copy));
|
|
mutex_unlock(&ec->lock);
|
|
if (copy.func) {
|
|
copy.func(copy.data);
|
|
} else if (copy.handle) {
|
|
acpi_evaluate_object(copy.handle, NULL, NULL, NULL);
|
|
}
|
|
return;
|
|
}
|
|
}
|
|
mutex_unlock(&ec->lock);
|
|
}
|
|
|
|
static u32 acpi_ec_gpe_handler(void *data)
|
|
{
|
|
acpi_status status = AE_OK;
|
|
struct acpi_ec *ec = data;
|
|
|
|
pr_debug(PREFIX "~~~> interrupt\n");
|
|
clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
|
|
if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags))
|
|
wake_up(&ec->wait);
|
|
|
|
if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI) {
|
|
if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags))
|
|
status = acpi_os_execute(OSL_EC_BURST_HANDLER,
|
|
acpi_ec_gpe_query, ec);
|
|
} else if (unlikely(!test_bit(EC_FLAGS_GPE_MODE, &ec->flags))) {
|
|
/* this is non-query, must be confirmation */
|
|
if (printk_ratelimit())
|
|
pr_info(PREFIX "non-query interrupt received,"
|
|
" switching to interrupt mode\n");
|
|
set_bit(EC_FLAGS_GPE_MODE, &ec->flags);
|
|
}
|
|
|
|
return ACPI_SUCCESS(status) ?
|
|
ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
|
|
}
|
|
|
|
/* --------------------------------------------------------------------------
|
|
Address Space Management
|
|
-------------------------------------------------------------------------- */
|
|
|
|
static acpi_status
|
|
acpi_ec_space_setup(acpi_handle region_handle,
|
|
u32 function, void *handler_context, void **return_context)
|
|
{
|
|
/*
|
|
* The EC object is in the handler context and is needed
|
|
* when calling the acpi_ec_space_handler.
|
|
*/
|
|
*return_context = (function != ACPI_REGION_DEACTIVATE) ?
|
|
handler_context : NULL;
|
|
|
|
return AE_OK;
|
|
}
|
|
|
|
static acpi_status
|
|
acpi_ec_space_handler(u32 function, acpi_physical_address address,
|
|
u32 bits, acpi_integer *value,
|
|
void *handler_context, void *region_context)
|
|
{
|
|
struct acpi_ec *ec = handler_context;
|
|
int result = 0, i;
|
|
u8 temp = 0;
|
|
|
|
if ((address > 0xFF) || !value || !handler_context)
|
|
return AE_BAD_PARAMETER;
|
|
|
|
if (function != ACPI_READ && function != ACPI_WRITE)
|
|
return AE_BAD_PARAMETER;
|
|
|
|
if (bits != 8 && acpi_strict)
|
|
return AE_BAD_PARAMETER;
|
|
|
|
acpi_ec_burst_enable(ec);
|
|
|
|
if (function == ACPI_READ) {
|
|
result = acpi_ec_read(ec, address, &temp);
|
|
*value = temp;
|
|
} else {
|
|
temp = 0xff & (*value);
|
|
result = acpi_ec_write(ec, address, temp);
|
|
}
|
|
|
|
for (i = 8; unlikely(bits - i > 0); i += 8) {
|
|
++address;
|
|
if (function == ACPI_READ) {
|
|
result = acpi_ec_read(ec, address, &temp);
|
|
(*value) |= ((acpi_integer)temp) << i;
|
|
} else {
|
|
temp = 0xff & ((*value) >> i);
|
|
result = acpi_ec_write(ec, address, temp);
|
|
}
|
|
}
|
|
|
|
acpi_ec_burst_disable(ec);
|
|
|
|
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 = seq->private;
|
|
|
|
if (!ec)
|
|
goto end;
|
|
|
|
seq_printf(seq, "gpe:\t\t\t0x%02x\n", (u32) ec->gpe);
|
|
seq_printf(seq, "ports:\t\t\t0x%02x, 0x%02x\n",
|
|
(unsigned)ec->command_addr, (unsigned)ec->data_addr);
|
|
seq_printf(seq, "use global lock:\t%s\n",
|
|
ec->global_lock ? "yes" : "no");
|
|
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 acpi_status
|
|
ec_parse_io_ports(struct acpi_resource *resource, void *context);
|
|
|
|
static struct acpi_ec *make_acpi_ec(void)
|
|
{
|
|
struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL);
|
|
if (!ec)
|
|
return NULL;
|
|
ec->flags = 1 << EC_FLAGS_QUERY_PENDING;
|
|
mutex_init(&ec->lock);
|
|
init_waitqueue_head(&ec->wait);
|
|
INIT_LIST_HEAD(&ec->list);
|
|
return ec;
|
|
}
|
|
|
|
static acpi_status
|
|
acpi_ec_register_query_methods(acpi_handle handle, u32 level,
|
|
void *context, void **return_value)
|
|
{
|
|
struct acpi_namespace_node *node = handle;
|
|
struct acpi_ec *ec = context;
|
|
int value = 0;
|
|
if (sscanf(node->name.ascii, "_Q%x", &value) == 1) {
|
|
acpi_ec_add_query_handler(ec, value, handle, NULL, NULL);
|
|
}
|
|
return AE_OK;
|
|
}
|
|
|
|
static acpi_status
|
|
ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval)
|
|
{
|
|
acpi_status status;
|
|
|
|
struct acpi_ec *ec = context;
|
|
status = acpi_walk_resources(handle, METHOD_NAME__CRS,
|
|
ec_parse_io_ports, ec);
|
|
if (ACPI_FAILURE(status))
|
|
return status;
|
|
|
|
/* Get GPE bit assignment (EC events). */
|
|
/* TODO: Add support for _GPE returning a package */
|
|
status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec->gpe);
|
|
if (ACPI_FAILURE(status))
|
|
return status;
|
|
/* Find and register all query methods */
|
|
acpi_walk_namespace(ACPI_TYPE_METHOD, handle, 1,
|
|
acpi_ec_register_query_methods, ec, NULL);
|
|
/* Use the global lock for all EC transactions? */
|
|
acpi_evaluate_integer(handle, "_GLK", NULL, &ec->global_lock);
|
|
ec->handle = handle;
|
|
return AE_CTRL_TERMINATE;
|
|
}
|
|
|
|
static void ec_remove_handlers(struct acpi_ec *ec)
|
|
{
|
|
if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle,
|
|
ACPI_ADR_SPACE_EC, &acpi_ec_space_handler)))
|
|
pr_err(PREFIX "failed to remove space handler\n");
|
|
if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe,
|
|
&acpi_ec_gpe_handler)))
|
|
pr_err(PREFIX "failed to remove gpe handler\n");
|
|
ec->handlers_installed = 0;
|
|
}
|
|
|
|
static int acpi_ec_add(struct acpi_device *device)
|
|
{
|
|
struct acpi_ec *ec = NULL;
|
|
|
|
if (!device)
|
|
return -EINVAL;
|
|
strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
|
|
strcpy(acpi_device_class(device), ACPI_EC_CLASS);
|
|
|
|
/* Check for boot EC */
|
|
if (boot_ec) {
|
|
if (boot_ec->handle == device->handle) {
|
|
/* Pre-loaded EC from DSDT, just move pointer */
|
|
ec = boot_ec;
|
|
boot_ec = NULL;
|
|
goto end;
|
|
} else if (boot_ec->handle == ACPI_ROOT_OBJECT) {
|
|
/* ECDT-based EC, time to shut it down */
|
|
ec_remove_handlers(boot_ec);
|
|
kfree(boot_ec);
|
|
first_ec = boot_ec = NULL;
|
|
}
|
|
}
|
|
|
|
ec = make_acpi_ec();
|
|
if (!ec)
|
|
return -ENOMEM;
|
|
|
|
if (ec_parse_device(device->handle, 0, ec, NULL) !=
|
|
AE_CTRL_TERMINATE) {
|
|
kfree(ec);
|
|
return -EINVAL;
|
|
}
|
|
ec->handle = device->handle;
|
|
end:
|
|
if (!first_ec)
|
|
first_ec = ec;
|
|
acpi_driver_data(device) = ec;
|
|
acpi_ec_add_fs(device);
|
|
pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n",
|
|
ec->gpe, ec->command_addr, ec->data_addr);
|
|
pr_info(PREFIX "driver started in %s mode\n",
|
|
(test_bit(EC_FLAGS_GPE_MODE, &ec->flags))?"interrupt":"poll");
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_ec_remove(struct acpi_device *device, int type)
|
|
{
|
|
struct acpi_ec *ec;
|
|
struct acpi_ec_query_handler *handler, *tmp;
|
|
|
|
if (!device)
|
|
return -EINVAL;
|
|
|
|
ec = acpi_driver_data(device);
|
|
mutex_lock(&ec->lock);
|
|
list_for_each_entry_safe(handler, tmp, &ec->list, node) {
|
|
list_del(&handler->node);
|
|
kfree(handler);
|
|
}
|
|
mutex_unlock(&ec->lock);
|
|
acpi_ec_remove_fs(device);
|
|
acpi_driver_data(device) = NULL;
|
|
if (ec == first_ec)
|
|
first_ec = NULL;
|
|
kfree(ec);
|
|
return 0;
|
|
}
|
|
|
|
static acpi_status
|
|
ec_parse_io_ports(struct acpi_resource *resource, void *context)
|
|
{
|
|
struct acpi_ec *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 ec_install_handlers(struct acpi_ec *ec)
|
|
{
|
|
acpi_status status;
|
|
if (ec->handlers_installed)
|
|
return 0;
|
|
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;
|
|
}
|
|
|
|
ec->handlers_installed = 1;
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_ec_start(struct acpi_device *device)
|
|
{
|
|
struct acpi_ec *ec;
|
|
int ret = 0;
|
|
|
|
if (!device)
|
|
return -EINVAL;
|
|
|
|
ec = acpi_driver_data(device);
|
|
|
|
if (!ec)
|
|
return -EINVAL;
|
|
|
|
ret = ec_install_handlers(ec);
|
|
|
|
/* EC is fully operational, allow queries */
|
|
clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
|
|
return ret;
|
|
}
|
|
|
|
static int acpi_ec_stop(struct acpi_device *device, int type)
|
|
{
|
|
struct acpi_ec *ec;
|
|
if (!device)
|
|
return -EINVAL;
|
|
ec = acpi_driver_data(device);
|
|
if (!ec)
|
|
return -EINVAL;
|
|
ec_remove_handlers(ec);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int __init acpi_boot_ec_enable(void)
|
|
{
|
|
if (!boot_ec || boot_ec->handlers_installed)
|
|
return 0;
|
|
if (!ec_install_handlers(boot_ec)) {
|
|
first_ec = boot_ec;
|
|
return 0;
|
|
}
|
|
return -EFAULT;
|
|
}
|
|
|
|
int __init acpi_ec_ecdt_probe(void)
|
|
{
|
|
int ret;
|
|
acpi_status status;
|
|
struct acpi_table_ecdt *ecdt_ptr;
|
|
|
|
boot_ec = make_acpi_ec();
|
|
if (!boot_ec)
|
|
return -ENOMEM;
|
|
/*
|
|
* Generate a boot ec context
|
|
*/
|
|
status = acpi_get_table(ACPI_SIG_ECDT, 1,
|
|
(struct acpi_table_header **)&ecdt_ptr);
|
|
if (ACPI_SUCCESS(status)) {
|
|
pr_info(PREFIX "EC description table is found, configuring boot EC\n");
|
|
boot_ec->command_addr = ecdt_ptr->control.address;
|
|
boot_ec->data_addr = ecdt_ptr->data.address;
|
|
boot_ec->gpe = ecdt_ptr->gpe;
|
|
boot_ec->handle = ACPI_ROOT_OBJECT;
|
|
} else {
|
|
/* This workaround is needed only on some broken machines,
|
|
* which require early EC, but fail to provide ECDT */
|
|
acpi_handle x;
|
|
printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n");
|
|
status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device,
|
|
boot_ec, NULL);
|
|
/* Check that acpi_get_devices actually find something */
|
|
if (ACPI_FAILURE(status) || !boot_ec->handle)
|
|
goto error;
|
|
/* We really need to limit this workaround, the only ASUS,
|
|
* which needs it, has fake EC._INI method, so use it as flag.
|
|
* Keep boot_ec struct as it will be needed soon.
|
|
*/
|
|
if (ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", &x)))
|
|
return -ENODEV;
|
|
}
|
|
|
|
ret = ec_install_handlers(boot_ec);
|
|
if (!ret) {
|
|
first_ec = boot_ec;
|
|
return 0;
|
|
}
|
|
error:
|
|
kfree(boot_ec);
|
|
boot_ec = 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 */
|