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![Rafael J. Wysocki](/assets/img/avatar_default.png)
Move acpi_ec_create_query() after acpi_ec_event_processor(), drop the no longer needed forward declaration of the latter, and eliminate acpi_ec_delete_query() which isn't really necessary. No intentional functional impact. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2247 lines
59 KiB
C
2247 lines
59 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* ec.c - ACPI Embedded Controller Driver (v3)
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*
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* Copyright (C) 2001-2015 Intel Corporation
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* Author: 2014, 2015 Lv Zheng <lv.zheng@intel.com>
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* 2006, 2007 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
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* 2006 Denis Sadykov <denis.m.sadykov@intel.com>
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* 2004 Luming Yu <luming.yu@intel.com>
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* 2001, 2002 Andy Grover <andrew.grover@intel.com>
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* 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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* Copyright (C) 2008 Alexey Starikovskiy <astarikovskiy@suse.de>
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*/
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/* Uncomment next line to get verbose printout */
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/* #define DEBUG */
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#define pr_fmt(fmt) "ACPI: EC: " fmt
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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/interrupt.h>
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#include <linux/list.h>
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#include <linux/spinlock.h>
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#include <linux/slab.h>
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#include <linux/suspend.h>
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#include <linux/acpi.h>
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#include <linux/dmi.h>
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#include <asm/io.h>
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#include "internal.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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/* 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_CMD 0x08 /* Input buffer contains a command */
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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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/*
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* The SCI_EVT clearing timing is not defined by the ACPI specification.
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* This leads to lots of practical timing issues for the host EC driver.
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* The following variations are defined (from the target EC firmware's
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* perspective):
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* STATUS: After indicating SCI_EVT edge triggered IRQ to the host, the
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* target can clear SCI_EVT at any time so long as the host can see
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* the indication by reading the status register (EC_SC). So the
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* host should re-check SCI_EVT after the first time the SCI_EVT
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* indication is seen, which is the same time the query request
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* (QR_EC) is written to the command register (EC_CMD). SCI_EVT set
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* at any later time could indicate another event. Normally such
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* kind of EC firmware has implemented an event queue and will
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* return 0x00 to indicate "no outstanding event".
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* QUERY: After seeing the query request (QR_EC) written to the command
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* register (EC_CMD) by the host and having prepared the responding
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* event value in the data register (EC_DATA), the target can safely
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* clear SCI_EVT because the target can confirm that the current
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* event is being handled by the host. The host then should check
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* SCI_EVT right after reading the event response from the data
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* register (EC_DATA).
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* EVENT: After seeing the event response read from the data register
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* (EC_DATA) by the host, the target can clear SCI_EVT. As the
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* target requires time to notice the change in the data register
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* (EC_DATA), the host may be required to wait additional guarding
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* time before checking the SCI_EVT again. Such guarding may not be
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* necessary if the host is notified via another IRQ.
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*/
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#define ACPI_EC_EVT_TIMING_STATUS 0x00
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#define ACPI_EC_EVT_TIMING_QUERY 0x01
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#define ACPI_EC_EVT_TIMING_EVENT 0x02
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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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#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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#define ACPI_EC_UDELAY_POLL 550 /* Wait 1ms for EC transaction polling */
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#define ACPI_EC_CLEAR_MAX 100 /* Maximum number of events to query
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* when trying to clear the EC */
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#define ACPI_EC_MAX_QUERIES 16 /* Maximum number of parallel queries */
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enum {
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EC_FLAGS_QUERY_ENABLED, /* Query is enabled */
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EC_FLAGS_EVENT_HANDLER_INSTALLED, /* Event handler installed */
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EC_FLAGS_EC_HANDLER_INSTALLED, /* OpReg handler installed */
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EC_FLAGS_QUERY_METHODS_INSTALLED, /* _Qxx handlers installed */
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EC_FLAGS_STARTED, /* Driver is started */
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EC_FLAGS_STOPPED, /* Driver is stopped */
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EC_FLAGS_EVENTS_MASKED, /* Events masked */
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};
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#define ACPI_EC_COMMAND_POLL 0x01 /* Available for command byte */
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#define ACPI_EC_COMMAND_COMPLETE 0x02 /* Completed last byte */
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/* ec.c is compiled in acpi namespace so this shows up as acpi.ec_delay param */
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static unsigned int ec_delay __read_mostly = ACPI_EC_DELAY;
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module_param(ec_delay, uint, 0644);
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MODULE_PARM_DESC(ec_delay, "Timeout(ms) waited until an EC command completes");
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static unsigned int ec_max_queries __read_mostly = ACPI_EC_MAX_QUERIES;
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module_param(ec_max_queries, uint, 0644);
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MODULE_PARM_DESC(ec_max_queries, "Maximum parallel _Qxx evaluations");
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static bool ec_busy_polling __read_mostly;
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module_param(ec_busy_polling, bool, 0644);
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MODULE_PARM_DESC(ec_busy_polling, "Use busy polling to advance EC transaction");
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static unsigned int ec_polling_guard __read_mostly = ACPI_EC_UDELAY_POLL;
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module_param(ec_polling_guard, uint, 0644);
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MODULE_PARM_DESC(ec_polling_guard, "Guard time(us) between EC accesses in polling modes");
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static unsigned int ec_event_clearing __read_mostly = ACPI_EC_EVT_TIMING_QUERY;
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/*
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* If the number of false interrupts per one transaction exceeds
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* this threshold, will think there is a GPE storm happened and
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* will disable the GPE for normal transaction.
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*/
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static unsigned int ec_storm_threshold __read_mostly = 8;
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module_param(ec_storm_threshold, uint, 0644);
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MODULE_PARM_DESC(ec_storm_threshold, "Maxim false GPE numbers not considered as GPE storm");
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static bool ec_freeze_events __read_mostly;
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module_param(ec_freeze_events, bool, 0644);
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MODULE_PARM_DESC(ec_freeze_events, "Disabling event handling during suspend/resume");
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static bool ec_no_wakeup __read_mostly;
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module_param(ec_no_wakeup, bool, 0644);
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MODULE_PARM_DESC(ec_no_wakeup, "Do not wake up from suspend-to-idle");
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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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struct kref kref;
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};
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struct transaction {
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const u8 *wdata;
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u8 *rdata;
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unsigned short irq_count;
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u8 command;
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u8 wi;
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u8 ri;
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u8 wlen;
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u8 rlen;
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u8 flags;
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};
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struct acpi_ec_query {
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struct transaction transaction;
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struct work_struct work;
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struct acpi_ec_query_handler *handler;
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struct acpi_ec *ec;
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};
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static int acpi_ec_submit_query(struct acpi_ec *ec);
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static bool advance_transaction(struct acpi_ec *ec, bool interrupt);
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static void acpi_ec_event_handler(struct work_struct *work);
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struct acpi_ec *first_ec;
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EXPORT_SYMBOL(first_ec);
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static struct acpi_ec *boot_ec;
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static bool boot_ec_is_ecdt;
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static struct workqueue_struct *ec_wq;
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static struct workqueue_struct *ec_query_wq;
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static int EC_FLAGS_CORRECT_ECDT; /* Needs ECDT port address correction */
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static int EC_FLAGS_IGNORE_DSDT_GPE; /* Needs ECDT GPE as correction setting */
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static int EC_FLAGS_TRUST_DSDT_GPE; /* Needs DSDT GPE as correction setting */
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static int EC_FLAGS_CLEAR_ON_RESUME; /* Needs acpi_ec_clear() on boot/resume */
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/* --------------------------------------------------------------------------
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* Logging/Debugging
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* -------------------------------------------------------------------------- */
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/*
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* Splitters used by the developers to track the boundary of the EC
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* handling processes.
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*/
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#ifdef DEBUG
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#define EC_DBG_SEP " "
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#define EC_DBG_DRV "+++++"
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#define EC_DBG_STM "====="
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#define EC_DBG_REQ "*****"
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#define EC_DBG_EVT "#####"
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#else
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#define EC_DBG_SEP ""
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#define EC_DBG_DRV
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#define EC_DBG_STM
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#define EC_DBG_REQ
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#define EC_DBG_EVT
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#endif
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#define ec_log_raw(fmt, ...) \
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pr_info(fmt "\n", ##__VA_ARGS__)
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#define ec_dbg_raw(fmt, ...) \
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pr_debug(fmt "\n", ##__VA_ARGS__)
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#define ec_log(filter, fmt, ...) \
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ec_log_raw(filter EC_DBG_SEP fmt EC_DBG_SEP filter, ##__VA_ARGS__)
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#define ec_dbg(filter, fmt, ...) \
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ec_dbg_raw(filter EC_DBG_SEP fmt EC_DBG_SEP filter, ##__VA_ARGS__)
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#define ec_log_drv(fmt, ...) \
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ec_log(EC_DBG_DRV, fmt, ##__VA_ARGS__)
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#define ec_dbg_drv(fmt, ...) \
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ec_dbg(EC_DBG_DRV, fmt, ##__VA_ARGS__)
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#define ec_dbg_stm(fmt, ...) \
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ec_dbg(EC_DBG_STM, fmt, ##__VA_ARGS__)
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#define ec_dbg_req(fmt, ...) \
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ec_dbg(EC_DBG_REQ, fmt, ##__VA_ARGS__)
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#define ec_dbg_evt(fmt, ...) \
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ec_dbg(EC_DBG_EVT, fmt, ##__VA_ARGS__)
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#define ec_dbg_ref(ec, fmt, ...) \
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ec_dbg_raw("%lu: " fmt, ec->reference_count, ## __VA_ARGS__)
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/* --------------------------------------------------------------------------
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* Device Flags
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* -------------------------------------------------------------------------- */
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static bool acpi_ec_started(struct acpi_ec *ec)
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{
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return test_bit(EC_FLAGS_STARTED, &ec->flags) &&
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!test_bit(EC_FLAGS_STOPPED, &ec->flags);
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}
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static bool acpi_ec_event_enabled(struct acpi_ec *ec)
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{
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/*
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* There is an OSPM early stage logic. During the early stages
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* (boot/resume), OSPMs shouldn't enable the event handling, only
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* the EC transactions are allowed to be performed.
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*/
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if (!test_bit(EC_FLAGS_QUERY_ENABLED, &ec->flags))
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return false;
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/*
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* However, disabling the event handling is experimental for late
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* stage (suspend), and is controlled by the boot parameter of
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* "ec_freeze_events":
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* 1. true: The EC event handling is disabled before entering
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* the noirq stage.
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* 2. false: The EC event handling is automatically disabled as
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* soon as the EC driver is stopped.
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*/
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if (ec_freeze_events)
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return acpi_ec_started(ec);
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else
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return test_bit(EC_FLAGS_STARTED, &ec->flags);
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}
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static bool acpi_ec_flushed(struct acpi_ec *ec)
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{
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return ec->reference_count == 1;
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}
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/* --------------------------------------------------------------------------
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* EC Registers
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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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ec_dbg_raw("EC_SC(R) = 0x%2.2x "
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"SCI_EVT=%d BURST=%d CMD=%d IBF=%d OBF=%d",
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x,
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!!(x & ACPI_EC_FLAG_SCI),
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!!(x & ACPI_EC_FLAG_BURST),
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!!(x & ACPI_EC_FLAG_CMD),
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!!(x & ACPI_EC_FLAG_IBF),
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!!(x & ACPI_EC_FLAG_OBF));
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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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ec->timestamp = jiffies;
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ec_dbg_raw("EC_DATA(R) = 0x%2.2x", x);
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return x;
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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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ec_dbg_raw("EC_SC(W) = 0x%2.2x", command);
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outb(command, ec->command_addr);
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ec->timestamp = jiffies;
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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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ec_dbg_raw("EC_DATA(W) = 0x%2.2x", data);
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outb(data, ec->data_addr);
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ec->timestamp = jiffies;
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}
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#if defined(DEBUG) || defined(CONFIG_DYNAMIC_DEBUG)
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static const char *acpi_ec_cmd_string(u8 cmd)
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{
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switch (cmd) {
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case 0x80:
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return "RD_EC";
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case 0x81:
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return "WR_EC";
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case 0x82:
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return "BE_EC";
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case 0x83:
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return "BD_EC";
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case 0x84:
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return "QR_EC";
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}
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return "UNKNOWN";
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}
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#else
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#define acpi_ec_cmd_string(cmd) "UNDEF"
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#endif
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/* --------------------------------------------------------------------------
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* GPE Registers
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* -------------------------------------------------------------------------- */
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static inline bool acpi_ec_gpe_status_set(struct acpi_ec *ec)
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{
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acpi_event_status gpe_status = 0;
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(void)acpi_get_gpe_status(NULL, ec->gpe, &gpe_status);
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return !!(gpe_status & ACPI_EVENT_FLAG_STATUS_SET);
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}
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static inline void acpi_ec_enable_gpe(struct acpi_ec *ec, bool open)
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{
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if (open)
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acpi_enable_gpe(NULL, ec->gpe);
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else {
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BUG_ON(ec->reference_count < 1);
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acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE);
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}
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if (acpi_ec_gpe_status_set(ec)) {
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/*
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* On some platforms, EN=1 writes cannot trigger GPE. So
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* software need to manually trigger a pseudo GPE event on
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* EN=1 writes.
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*/
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ec_dbg_raw("Polling quirk");
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advance_transaction(ec, false);
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}
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}
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static inline void acpi_ec_disable_gpe(struct acpi_ec *ec, bool close)
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{
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if (close)
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acpi_disable_gpe(NULL, ec->gpe);
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else {
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BUG_ON(ec->reference_count < 1);
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acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE);
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}
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}
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/* --------------------------------------------------------------------------
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* Transaction Management
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* -------------------------------------------------------------------------- */
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static void acpi_ec_submit_request(struct acpi_ec *ec)
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{
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ec->reference_count++;
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if (test_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED, &ec->flags) &&
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ec->gpe >= 0 && ec->reference_count == 1)
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acpi_ec_enable_gpe(ec, true);
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}
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static void acpi_ec_complete_request(struct acpi_ec *ec)
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{
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bool flushed = false;
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ec->reference_count--;
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if (test_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED, &ec->flags) &&
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ec->gpe >= 0 && ec->reference_count == 0)
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acpi_ec_disable_gpe(ec, true);
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flushed = acpi_ec_flushed(ec);
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if (flushed)
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wake_up(&ec->wait);
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}
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static void acpi_ec_mask_events(struct acpi_ec *ec)
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{
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if (!test_bit(EC_FLAGS_EVENTS_MASKED, &ec->flags)) {
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if (ec->gpe >= 0)
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acpi_ec_disable_gpe(ec, false);
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else
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disable_irq_nosync(ec->irq);
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ec_dbg_drv("Polling enabled");
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set_bit(EC_FLAGS_EVENTS_MASKED, &ec->flags);
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}
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}
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static void acpi_ec_unmask_events(struct acpi_ec *ec)
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{
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if (test_bit(EC_FLAGS_EVENTS_MASKED, &ec->flags)) {
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clear_bit(EC_FLAGS_EVENTS_MASKED, &ec->flags);
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if (ec->gpe >= 0)
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acpi_ec_enable_gpe(ec, false);
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else
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enable_irq(ec->irq);
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ec_dbg_drv("Polling disabled");
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}
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}
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/*
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* acpi_ec_submit_flushable_request() - Increase the reference count unless
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* the flush operation is not in
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* progress
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* @ec: the EC device
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*
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* This function must be used before taking a new action that should hold
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* the reference count. If this function returns false, then the action
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* must be discarded or it will prevent the flush operation from being
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* completed.
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*/
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static bool acpi_ec_submit_flushable_request(struct acpi_ec *ec)
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{
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if (!acpi_ec_started(ec))
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return false;
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acpi_ec_submit_request(ec);
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return true;
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}
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static bool acpi_ec_submit_event(struct acpi_ec *ec)
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{
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acpi_ec_mask_events(ec);
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if (!acpi_ec_event_enabled(ec))
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return false;
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if (ec->event_state == EC_EVENT_READY) {
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ec_dbg_evt("Command(%s) submitted/blocked",
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acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY));
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ec->event_state = EC_EVENT_IN_PROGRESS;
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/*
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* If events_to_process is greqter than 0 at this point, the
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* while () loop in acpi_ec_event_handler() is still running
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* and incrementing events_to_process will cause it to invoke
|
|
* acpi_ec_submit_query() once more, so it is not necessary to
|
|
* queue up the event work to start the same loop again.
|
|
*/
|
|
if (ec->events_to_process++ > 0)
|
|
return true;
|
|
|
|
ec->events_in_progress++;
|
|
return queue_work(ec_wq, &ec->work);
|
|
}
|
|
|
|
/*
|
|
* The event handling work has not been completed yet, so it needs to be
|
|
* flushed.
|
|
*/
|
|
return true;
|
|
}
|
|
|
|
static void acpi_ec_complete_event(struct acpi_ec *ec)
|
|
{
|
|
if (ec->event_state == EC_EVENT_IN_PROGRESS)
|
|
ec->event_state = EC_EVENT_COMPLETE;
|
|
}
|
|
|
|
static void acpi_ec_close_event(struct acpi_ec *ec)
|
|
{
|
|
if (ec->event_state != EC_EVENT_READY)
|
|
ec_dbg_evt("Command(%s) unblocked",
|
|
acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY));
|
|
|
|
ec->event_state = EC_EVENT_READY;
|
|
acpi_ec_unmask_events(ec);
|
|
}
|
|
|
|
static inline void __acpi_ec_enable_event(struct acpi_ec *ec)
|
|
{
|
|
if (!test_and_set_bit(EC_FLAGS_QUERY_ENABLED, &ec->flags))
|
|
ec_log_drv("event unblocked");
|
|
/*
|
|
* Unconditionally invoke this once after enabling the event
|
|
* handling mechanism to detect the pending events.
|
|
*/
|
|
advance_transaction(ec, false);
|
|
}
|
|
|
|
static inline void __acpi_ec_disable_event(struct acpi_ec *ec)
|
|
{
|
|
if (test_and_clear_bit(EC_FLAGS_QUERY_ENABLED, &ec->flags))
|
|
ec_log_drv("event blocked");
|
|
}
|
|
|
|
/*
|
|
* Process _Q events that might have accumulated in the EC.
|
|
* Run with locked ec mutex.
|
|
*/
|
|
static void acpi_ec_clear(struct acpi_ec *ec)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ACPI_EC_CLEAR_MAX; i++) {
|
|
if (acpi_ec_submit_query(ec))
|
|
break;
|
|
}
|
|
if (unlikely(i == ACPI_EC_CLEAR_MAX))
|
|
pr_warn("Warning: Maximum of %d stale EC events cleared\n", i);
|
|
else
|
|
pr_info("%d stale EC events cleared\n", i);
|
|
}
|
|
|
|
static void acpi_ec_enable_event(struct acpi_ec *ec)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&ec->lock, flags);
|
|
if (acpi_ec_started(ec))
|
|
__acpi_ec_enable_event(ec);
|
|
spin_unlock_irqrestore(&ec->lock, flags);
|
|
|
|
/* Drain additional events if hardware requires that */
|
|
if (EC_FLAGS_CLEAR_ON_RESUME)
|
|
acpi_ec_clear(ec);
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static void __acpi_ec_flush_work(void)
|
|
{
|
|
flush_workqueue(ec_wq); /* flush ec->work */
|
|
flush_workqueue(ec_query_wq); /* flush queries */
|
|
}
|
|
|
|
static void acpi_ec_disable_event(struct acpi_ec *ec)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&ec->lock, flags);
|
|
__acpi_ec_disable_event(ec);
|
|
spin_unlock_irqrestore(&ec->lock, flags);
|
|
|
|
/*
|
|
* When ec_freeze_events is true, we need to flush events in
|
|
* the proper position before entering the noirq stage.
|
|
*/
|
|
__acpi_ec_flush_work();
|
|
}
|
|
|
|
void acpi_ec_flush_work(void)
|
|
{
|
|
/* Without ec_wq there is nothing to flush. */
|
|
if (!ec_wq)
|
|
return;
|
|
|
|
__acpi_ec_flush_work();
|
|
}
|
|
#endif /* CONFIG_PM_SLEEP */
|
|
|
|
static bool acpi_ec_guard_event(struct acpi_ec *ec)
|
|
{
|
|
unsigned long flags;
|
|
bool guarded;
|
|
|
|
spin_lock_irqsave(&ec->lock, flags);
|
|
/*
|
|
* If firmware SCI_EVT clearing timing is "event", we actually
|
|
* don't know when the SCI_EVT will be cleared by firmware after
|
|
* evaluating _Qxx, so we need to re-check SCI_EVT after waiting an
|
|
* acceptable period.
|
|
*
|
|
* The guarding period is applicable if the event state is not
|
|
* EC_EVENT_READY, but otherwise if the current transaction is of the
|
|
* ACPI_EC_COMMAND_QUERY type, the guarding should have elapsed already
|
|
* and it should not be applied to let the transaction transition into
|
|
* the ACPI_EC_COMMAND_POLL state immediately.
|
|
*/
|
|
guarded = ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT &&
|
|
ec->event_state != EC_EVENT_READY &&
|
|
(!ec->curr || ec->curr->command != ACPI_EC_COMMAND_QUERY);
|
|
spin_unlock_irqrestore(&ec->lock, flags);
|
|
return guarded;
|
|
}
|
|
|
|
static int ec_transaction_polled(struct acpi_ec *ec)
|
|
{
|
|
unsigned long flags;
|
|
int ret = 0;
|
|
|
|
spin_lock_irqsave(&ec->lock, flags);
|
|
if (ec->curr && (ec->curr->flags & ACPI_EC_COMMAND_POLL))
|
|
ret = 1;
|
|
spin_unlock_irqrestore(&ec->lock, flags);
|
|
return ret;
|
|
}
|
|
|
|
static int ec_transaction_completed(struct acpi_ec *ec)
|
|
{
|
|
unsigned long flags;
|
|
int ret = 0;
|
|
|
|
spin_lock_irqsave(&ec->lock, flags);
|
|
if (ec->curr && (ec->curr->flags & ACPI_EC_COMMAND_COMPLETE))
|
|
ret = 1;
|
|
spin_unlock_irqrestore(&ec->lock, flags);
|
|
return ret;
|
|
}
|
|
|
|
static inline void ec_transaction_transition(struct acpi_ec *ec, unsigned long flag)
|
|
{
|
|
ec->curr->flags |= flag;
|
|
|
|
if (ec->curr->command != ACPI_EC_COMMAND_QUERY)
|
|
return;
|
|
|
|
switch (ec_event_clearing) {
|
|
case ACPI_EC_EVT_TIMING_STATUS:
|
|
if (flag == ACPI_EC_COMMAND_POLL)
|
|
acpi_ec_close_event(ec);
|
|
|
|
return;
|
|
|
|
case ACPI_EC_EVT_TIMING_QUERY:
|
|
if (flag == ACPI_EC_COMMAND_COMPLETE)
|
|
acpi_ec_close_event(ec);
|
|
|
|
return;
|
|
|
|
case ACPI_EC_EVT_TIMING_EVENT:
|
|
if (flag == ACPI_EC_COMMAND_COMPLETE)
|
|
acpi_ec_complete_event(ec);
|
|
}
|
|
}
|
|
|
|
static void acpi_ec_spurious_interrupt(struct acpi_ec *ec, struct transaction *t)
|
|
{
|
|
if (t->irq_count < ec_storm_threshold)
|
|
++t->irq_count;
|
|
|
|
/* Trigger if the threshold is 0 too. */
|
|
if (t->irq_count == ec_storm_threshold)
|
|
acpi_ec_mask_events(ec);
|
|
}
|
|
|
|
static bool advance_transaction(struct acpi_ec *ec, bool interrupt)
|
|
{
|
|
struct transaction *t = ec->curr;
|
|
bool wakeup = false;
|
|
bool ret = false;
|
|
u8 status;
|
|
|
|
ec_dbg_stm("%s (%d)", interrupt ? "IRQ" : "TASK", smp_processor_id());
|
|
|
|
/*
|
|
* Clear GPE_STS upfront to allow subsequent hardware GPE_STS 0->1
|
|
* changes to always trigger a GPE interrupt.
|
|
*
|
|
* GPE STS is a W1C register, which means:
|
|
*
|
|
* 1. Software can clear it without worrying about clearing the other
|
|
* GPEs' STS bits when the hardware sets them in parallel.
|
|
*
|
|
* 2. As long as software can ensure only clearing it when it is set,
|
|
* hardware won't set it in parallel.
|
|
*/
|
|
if (ec->gpe >= 0 && acpi_ec_gpe_status_set(ec))
|
|
acpi_clear_gpe(NULL, ec->gpe);
|
|
|
|
status = acpi_ec_read_status(ec);
|
|
|
|
/*
|
|
* Another IRQ or a guarded polling mode advancement is detected,
|
|
* the next QR_EC submission is then allowed.
|
|
*/
|
|
if (!t || !(t->flags & ACPI_EC_COMMAND_POLL)) {
|
|
if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT &&
|
|
ec->event_state == EC_EVENT_COMPLETE)
|
|
acpi_ec_close_event(ec);
|
|
|
|
if (!t)
|
|
goto out;
|
|
}
|
|
|
|
if (t->flags & ACPI_EC_COMMAND_POLL) {
|
|
if (t->wlen > t->wi) {
|
|
if (!(status & ACPI_EC_FLAG_IBF))
|
|
acpi_ec_write_data(ec, t->wdata[t->wi++]);
|
|
else if (interrupt && !(status & ACPI_EC_FLAG_SCI))
|
|
acpi_ec_spurious_interrupt(ec, t);
|
|
} else if (t->rlen > t->ri) {
|
|
if (status & ACPI_EC_FLAG_OBF) {
|
|
t->rdata[t->ri++] = acpi_ec_read_data(ec);
|
|
if (t->rlen == t->ri) {
|
|
ec_transaction_transition(ec, ACPI_EC_COMMAND_COMPLETE);
|
|
wakeup = true;
|
|
if (t->command == ACPI_EC_COMMAND_QUERY)
|
|
ec_dbg_evt("Command(%s) completed by hardware",
|
|
acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY));
|
|
}
|
|
} else if (interrupt && !(status & ACPI_EC_FLAG_SCI)) {
|
|
acpi_ec_spurious_interrupt(ec, t);
|
|
}
|
|
} else if (t->wlen == t->wi && !(status & ACPI_EC_FLAG_IBF)) {
|
|
ec_transaction_transition(ec, ACPI_EC_COMMAND_COMPLETE);
|
|
wakeup = true;
|
|
}
|
|
} else if (!(status & ACPI_EC_FLAG_IBF)) {
|
|
acpi_ec_write_cmd(ec, t->command);
|
|
ec_transaction_transition(ec, ACPI_EC_COMMAND_POLL);
|
|
}
|
|
|
|
out:
|
|
if (status & ACPI_EC_FLAG_SCI)
|
|
ret = acpi_ec_submit_event(ec);
|
|
|
|
if (wakeup && interrupt)
|
|
wake_up(&ec->wait);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void start_transaction(struct acpi_ec *ec)
|
|
{
|
|
ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0;
|
|
ec->curr->flags = 0;
|
|
}
|
|
|
|
static int ec_guard(struct acpi_ec *ec)
|
|
{
|
|
unsigned long guard = usecs_to_jiffies(ec->polling_guard);
|
|
unsigned long timeout = ec->timestamp + guard;
|
|
|
|
/* Ensure guarding period before polling EC status */
|
|
do {
|
|
if (ec->busy_polling) {
|
|
/* Perform busy polling */
|
|
if (ec_transaction_completed(ec))
|
|
return 0;
|
|
udelay(jiffies_to_usecs(guard));
|
|
} else {
|
|
/*
|
|
* Perform wait polling
|
|
* 1. Wait the transaction to be completed by the
|
|
* GPE handler after the transaction enters
|
|
* ACPI_EC_COMMAND_POLL state.
|
|
* 2. A special guarding logic is also required
|
|
* for event clearing mode "event" before the
|
|
* transaction enters ACPI_EC_COMMAND_POLL
|
|
* state.
|
|
*/
|
|
if (!ec_transaction_polled(ec) &&
|
|
!acpi_ec_guard_event(ec))
|
|
break;
|
|
if (wait_event_timeout(ec->wait,
|
|
ec_transaction_completed(ec),
|
|
guard))
|
|
return 0;
|
|
}
|
|
} while (time_before(jiffies, timeout));
|
|
return -ETIME;
|
|
}
|
|
|
|
static int ec_poll(struct acpi_ec *ec)
|
|
{
|
|
unsigned long flags;
|
|
int repeat = 5; /* number of command restarts */
|
|
|
|
while (repeat--) {
|
|
unsigned long delay = jiffies +
|
|
msecs_to_jiffies(ec_delay);
|
|
do {
|
|
if (!ec_guard(ec))
|
|
return 0;
|
|
spin_lock_irqsave(&ec->lock, flags);
|
|
advance_transaction(ec, false);
|
|
spin_unlock_irqrestore(&ec->lock, flags);
|
|
} while (time_before(jiffies, delay));
|
|
pr_debug("controller reset, restart transaction\n");
|
|
spin_lock_irqsave(&ec->lock, flags);
|
|
start_transaction(ec);
|
|
spin_unlock_irqrestore(&ec->lock, flags);
|
|
}
|
|
return -ETIME;
|
|
}
|
|
|
|
static int acpi_ec_transaction_unlocked(struct acpi_ec *ec,
|
|
struct transaction *t)
|
|
{
|
|
unsigned long tmp;
|
|
int ret = 0;
|
|
|
|
/* start transaction */
|
|
spin_lock_irqsave(&ec->lock, tmp);
|
|
/* Enable GPE for command processing (IBF=0/OBF=1) */
|
|
if (!acpi_ec_submit_flushable_request(ec)) {
|
|
ret = -EINVAL;
|
|
goto unlock;
|
|
}
|
|
ec_dbg_ref(ec, "Increase command");
|
|
/* following two actions should be kept atomic */
|
|
ec->curr = t;
|
|
ec_dbg_req("Command(%s) started", acpi_ec_cmd_string(t->command));
|
|
start_transaction(ec);
|
|
spin_unlock_irqrestore(&ec->lock, tmp);
|
|
|
|
ret = ec_poll(ec);
|
|
|
|
spin_lock_irqsave(&ec->lock, tmp);
|
|
if (t->irq_count == ec_storm_threshold)
|
|
acpi_ec_unmask_events(ec);
|
|
ec_dbg_req("Command(%s) stopped", acpi_ec_cmd_string(t->command));
|
|
ec->curr = NULL;
|
|
/* Disable GPE for command processing (IBF=0/OBF=1) */
|
|
acpi_ec_complete_request(ec);
|
|
ec_dbg_ref(ec, "Decrease command");
|
|
unlock:
|
|
spin_unlock_irqrestore(&ec->lock, tmp);
|
|
return ret;
|
|
}
|
|
|
|
static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t)
|
|
{
|
|
int status;
|
|
u32 glk;
|
|
|
|
if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata))
|
|
return -EINVAL;
|
|
if (t->rdata)
|
|
memset(t->rdata, 0, t->rlen);
|
|
|
|
mutex_lock(&ec->mutex);
|
|
if (ec->global_lock) {
|
|
status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
|
|
if (ACPI_FAILURE(status)) {
|
|
status = -ENODEV;
|
|
goto unlock;
|
|
}
|
|
}
|
|
|
|
status = acpi_ec_transaction_unlocked(ec, t);
|
|
|
|
if (ec->global_lock)
|
|
acpi_release_global_lock(glk);
|
|
unlock:
|
|
mutex_unlock(&ec->mutex);
|
|
return status;
|
|
}
|
|
|
|
static int acpi_ec_burst_enable(struct acpi_ec *ec)
|
|
{
|
|
u8 d;
|
|
struct transaction t = {.command = ACPI_EC_BURST_ENABLE,
|
|
.wdata = NULL, .rdata = &d,
|
|
.wlen = 0, .rlen = 1};
|
|
|
|
return acpi_ec_transaction(ec, &t);
|
|
}
|
|
|
|
static int acpi_ec_burst_disable(struct acpi_ec *ec)
|
|
{
|
|
struct transaction t = {.command = ACPI_EC_BURST_DISABLE,
|
|
.wdata = NULL, .rdata = NULL,
|
|
.wlen = 0, .rlen = 0};
|
|
|
|
return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ?
|
|
acpi_ec_transaction(ec, &t) : 0;
|
|
}
|
|
|
|
static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 *data)
|
|
{
|
|
int result;
|
|
u8 d;
|
|
struct transaction t = {.command = ACPI_EC_COMMAND_READ,
|
|
.wdata = &address, .rdata = &d,
|
|
.wlen = 1, .rlen = 1};
|
|
|
|
result = acpi_ec_transaction(ec, &t);
|
|
*data = d;
|
|
return result;
|
|
}
|
|
|
|
static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data)
|
|
{
|
|
u8 wdata[2] = { address, data };
|
|
struct transaction t = {.command = ACPI_EC_COMMAND_WRITE,
|
|
.wdata = wdata, .rdata = NULL,
|
|
.wlen = 2, .rlen = 0};
|
|
|
|
return acpi_ec_transaction(ec, &t);
|
|
}
|
|
|
|
int ec_read(u8 addr, u8 *val)
|
|
{
|
|
int err;
|
|
u8 temp_data;
|
|
|
|
if (!first_ec)
|
|
return -ENODEV;
|
|
|
|
err = acpi_ec_read(first_ec, addr, &temp_data);
|
|
|
|
if (!err) {
|
|
*val = temp_data;
|
|
return 0;
|
|
}
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(ec_read);
|
|
|
|
int ec_write(u8 addr, u8 val)
|
|
{
|
|
int err;
|
|
|
|
if (!first_ec)
|
|
return -ENODEV;
|
|
|
|
err = acpi_ec_write(first_ec, addr, val);
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(ec_write);
|
|
|
|
int ec_transaction(u8 command,
|
|
const u8 *wdata, unsigned wdata_len,
|
|
u8 *rdata, unsigned rdata_len)
|
|
{
|
|
struct transaction t = {.command = command,
|
|
.wdata = wdata, .rdata = rdata,
|
|
.wlen = wdata_len, .rlen = rdata_len};
|
|
|
|
if (!first_ec)
|
|
return -ENODEV;
|
|
|
|
return acpi_ec_transaction(first_ec, &t);
|
|
}
|
|
EXPORT_SYMBOL(ec_transaction);
|
|
|
|
/* Get the handle to the EC device */
|
|
acpi_handle ec_get_handle(void)
|
|
{
|
|
if (!first_ec)
|
|
return NULL;
|
|
return first_ec->handle;
|
|
}
|
|
EXPORT_SYMBOL(ec_get_handle);
|
|
|
|
static void acpi_ec_start(struct acpi_ec *ec, bool resuming)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&ec->lock, flags);
|
|
if (!test_and_set_bit(EC_FLAGS_STARTED, &ec->flags)) {
|
|
ec_dbg_drv("Starting EC");
|
|
/* Enable GPE for event processing (SCI_EVT=1) */
|
|
if (!resuming) {
|
|
acpi_ec_submit_request(ec);
|
|
ec_dbg_ref(ec, "Increase driver");
|
|
}
|
|
ec_log_drv("EC started");
|
|
}
|
|
spin_unlock_irqrestore(&ec->lock, flags);
|
|
}
|
|
|
|
static bool acpi_ec_stopped(struct acpi_ec *ec)
|
|
{
|
|
unsigned long flags;
|
|
bool flushed;
|
|
|
|
spin_lock_irqsave(&ec->lock, flags);
|
|
flushed = acpi_ec_flushed(ec);
|
|
spin_unlock_irqrestore(&ec->lock, flags);
|
|
return flushed;
|
|
}
|
|
|
|
static void acpi_ec_stop(struct acpi_ec *ec, bool suspending)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&ec->lock, flags);
|
|
if (acpi_ec_started(ec)) {
|
|
ec_dbg_drv("Stopping EC");
|
|
set_bit(EC_FLAGS_STOPPED, &ec->flags);
|
|
spin_unlock_irqrestore(&ec->lock, flags);
|
|
wait_event(ec->wait, acpi_ec_stopped(ec));
|
|
spin_lock_irqsave(&ec->lock, flags);
|
|
/* Disable GPE for event processing (SCI_EVT=1) */
|
|
if (!suspending) {
|
|
acpi_ec_complete_request(ec);
|
|
ec_dbg_ref(ec, "Decrease driver");
|
|
} else if (!ec_freeze_events)
|
|
__acpi_ec_disable_event(ec);
|
|
clear_bit(EC_FLAGS_STARTED, &ec->flags);
|
|
clear_bit(EC_FLAGS_STOPPED, &ec->flags);
|
|
ec_log_drv("EC stopped");
|
|
}
|
|
spin_unlock_irqrestore(&ec->lock, flags);
|
|
}
|
|
|
|
static void acpi_ec_enter_noirq(struct acpi_ec *ec)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&ec->lock, flags);
|
|
ec->busy_polling = true;
|
|
ec->polling_guard = 0;
|
|
ec_log_drv("interrupt blocked");
|
|
spin_unlock_irqrestore(&ec->lock, flags);
|
|
}
|
|
|
|
static void acpi_ec_leave_noirq(struct acpi_ec *ec)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&ec->lock, flags);
|
|
ec->busy_polling = ec_busy_polling;
|
|
ec->polling_guard = ec_polling_guard;
|
|
ec_log_drv("interrupt unblocked");
|
|
spin_unlock_irqrestore(&ec->lock, flags);
|
|
}
|
|
|
|
void acpi_ec_block_transactions(void)
|
|
{
|
|
struct acpi_ec *ec = first_ec;
|
|
|
|
if (!ec)
|
|
return;
|
|
|
|
mutex_lock(&ec->mutex);
|
|
/* Prevent transactions from being carried out */
|
|
acpi_ec_stop(ec, true);
|
|
mutex_unlock(&ec->mutex);
|
|
}
|
|
|
|
void acpi_ec_unblock_transactions(void)
|
|
{
|
|
/*
|
|
* Allow transactions to happen again (this function is called from
|
|
* atomic context during wakeup, so we don't need to acquire the mutex).
|
|
*/
|
|
if (first_ec)
|
|
acpi_ec_start(first_ec, true);
|
|
}
|
|
|
|
/* --------------------------------------------------------------------------
|
|
Event Management
|
|
-------------------------------------------------------------------------- */
|
|
static struct acpi_ec_query_handler *
|
|
acpi_ec_get_query_handler_by_value(struct acpi_ec *ec, u8 value)
|
|
{
|
|
struct acpi_ec_query_handler *handler;
|
|
|
|
mutex_lock(&ec->mutex);
|
|
list_for_each_entry(handler, &ec->list, node) {
|
|
if (value == handler->query_bit) {
|
|
kref_get(&handler->kref);
|
|
mutex_unlock(&ec->mutex);
|
|
return handler;
|
|
}
|
|
}
|
|
mutex_unlock(&ec->mutex);
|
|
return NULL;
|
|
}
|
|
|
|
static void acpi_ec_query_handler_release(struct kref *kref)
|
|
{
|
|
struct acpi_ec_query_handler *handler =
|
|
container_of(kref, struct acpi_ec_query_handler, kref);
|
|
|
|
kfree(handler);
|
|
}
|
|
|
|
static void acpi_ec_put_query_handler(struct acpi_ec_query_handler *handler)
|
|
{
|
|
kref_put(&handler->kref, acpi_ec_query_handler_release);
|
|
}
|
|
|
|
int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit,
|
|
acpi_handle handle, acpi_ec_query_func func,
|
|
void *data)
|
|
{
|
|
struct acpi_ec_query_handler *handler =
|
|
kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL);
|
|
|
|
if (!handler)
|
|
return -ENOMEM;
|
|
|
|
handler->query_bit = query_bit;
|
|
handler->handle = handle;
|
|
handler->func = func;
|
|
handler->data = data;
|
|
mutex_lock(&ec->mutex);
|
|
kref_init(&handler->kref);
|
|
list_add(&handler->node, &ec->list);
|
|
mutex_unlock(&ec->mutex);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler);
|
|
|
|
static void acpi_ec_remove_query_handlers(struct acpi_ec *ec,
|
|
bool remove_all, u8 query_bit)
|
|
{
|
|
struct acpi_ec_query_handler *handler, *tmp;
|
|
LIST_HEAD(free_list);
|
|
|
|
mutex_lock(&ec->mutex);
|
|
list_for_each_entry_safe(handler, tmp, &ec->list, node) {
|
|
if (remove_all || query_bit == handler->query_bit) {
|
|
list_del_init(&handler->node);
|
|
list_add(&handler->node, &free_list);
|
|
}
|
|
}
|
|
mutex_unlock(&ec->mutex);
|
|
list_for_each_entry_safe(handler, tmp, &free_list, node)
|
|
acpi_ec_put_query_handler(handler);
|
|
}
|
|
|
|
void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit)
|
|
{
|
|
acpi_ec_remove_query_handlers(ec, false, query_bit);
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler);
|
|
|
|
static void acpi_ec_event_processor(struct work_struct *work)
|
|
{
|
|
struct acpi_ec_query *q = container_of(work, struct acpi_ec_query, work);
|
|
struct acpi_ec_query_handler *handler = q->handler;
|
|
struct acpi_ec *ec = q->ec;
|
|
|
|
ec_dbg_evt("Query(0x%02x) started", handler->query_bit);
|
|
|
|
if (handler->func)
|
|
handler->func(handler->data);
|
|
else if (handler->handle)
|
|
acpi_evaluate_object(handler->handle, NULL, NULL, NULL);
|
|
|
|
ec_dbg_evt("Query(0x%02x) stopped", handler->query_bit);
|
|
|
|
spin_lock_irq(&ec->lock);
|
|
ec->queries_in_progress--;
|
|
spin_unlock_irq(&ec->lock);
|
|
|
|
acpi_ec_put_query_handler(handler);
|
|
kfree(q);
|
|
}
|
|
|
|
static struct acpi_ec_query *acpi_ec_create_query(struct acpi_ec *ec, u8 *pval)
|
|
{
|
|
struct acpi_ec_query *q;
|
|
struct transaction *t;
|
|
|
|
q = kzalloc(sizeof (struct acpi_ec_query), GFP_KERNEL);
|
|
if (!q)
|
|
return NULL;
|
|
|
|
INIT_WORK(&q->work, acpi_ec_event_processor);
|
|
t = &q->transaction;
|
|
t->command = ACPI_EC_COMMAND_QUERY;
|
|
t->rdata = pval;
|
|
t->rlen = 1;
|
|
q->ec = ec;
|
|
return q;
|
|
}
|
|
|
|
static int acpi_ec_submit_query(struct acpi_ec *ec)
|
|
{
|
|
struct acpi_ec_query *q;
|
|
u8 value = 0;
|
|
int result;
|
|
|
|
q = acpi_ec_create_query(ec, &value);
|
|
if (!q)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* Query the EC to find out which _Qxx method we need to evaluate.
|
|
* Note that successful completion of the query causes the ACPI_EC_SCI
|
|
* bit to be cleared (and thus clearing the interrupt source).
|
|
*/
|
|
result = acpi_ec_transaction(ec, &q->transaction);
|
|
if (result)
|
|
goto err_exit;
|
|
|
|
if (!value) {
|
|
result = -ENODATA;
|
|
goto err_exit;
|
|
}
|
|
|
|
q->handler = acpi_ec_get_query_handler_by_value(ec, value);
|
|
if (!q->handler) {
|
|
result = -ENODATA;
|
|
goto err_exit;
|
|
}
|
|
|
|
/*
|
|
* It is reported that _Qxx are evaluated in a parallel way on Windows:
|
|
* https://bugzilla.kernel.org/show_bug.cgi?id=94411
|
|
*
|
|
* Put this log entry before queue_work() to make it appear in the log
|
|
* before any other messages emitted during workqueue handling.
|
|
*/
|
|
ec_dbg_evt("Query(0x%02x) scheduled", value);
|
|
|
|
spin_lock_irq(&ec->lock);
|
|
|
|
ec->queries_in_progress++;
|
|
queue_work(ec_query_wq, &q->work);
|
|
|
|
spin_unlock_irq(&ec->lock);
|
|
|
|
return 0;
|
|
|
|
err_exit:
|
|
kfree(q);
|
|
|
|
return result;
|
|
}
|
|
|
|
static void acpi_ec_event_handler(struct work_struct *work)
|
|
{
|
|
struct acpi_ec *ec = container_of(work, struct acpi_ec, work);
|
|
|
|
ec_dbg_evt("Event started");
|
|
|
|
spin_lock_irq(&ec->lock);
|
|
|
|
while (ec->events_to_process) {
|
|
spin_unlock_irq(&ec->lock);
|
|
|
|
acpi_ec_submit_query(ec);
|
|
|
|
spin_lock_irq(&ec->lock);
|
|
ec->events_to_process--;
|
|
}
|
|
|
|
/*
|
|
* Before exit, make sure that the it will be possible to queue up the
|
|
* event handling work again regardless of whether or not the query
|
|
* queued up above is processed successfully.
|
|
*/
|
|
if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT)
|
|
acpi_ec_complete_event(ec);
|
|
else
|
|
acpi_ec_close_event(ec);
|
|
|
|
spin_unlock_irq(&ec->lock);
|
|
|
|
ec_dbg_evt("Event stopped");
|
|
|
|
if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT && ec_guard(ec)) {
|
|
spin_lock_irq(&ec->lock);
|
|
|
|
/* Take care of SCI_EVT unless someone else is doing that. */
|
|
if (!ec->curr)
|
|
advance_transaction(ec, false);
|
|
|
|
spin_unlock_irq(&ec->lock);
|
|
}
|
|
|
|
spin_lock_irq(&ec->lock);
|
|
ec->events_in_progress--;
|
|
spin_unlock_irq(&ec->lock);
|
|
}
|
|
|
|
static void acpi_ec_handle_interrupt(struct acpi_ec *ec)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&ec->lock, flags);
|
|
advance_transaction(ec, true);
|
|
spin_unlock_irqrestore(&ec->lock, flags);
|
|
}
|
|
|
|
static u32 acpi_ec_gpe_handler(acpi_handle gpe_device,
|
|
u32 gpe_number, void *data)
|
|
{
|
|
acpi_ec_handle_interrupt(data);
|
|
return ACPI_INTERRUPT_HANDLED;
|
|
}
|
|
|
|
static irqreturn_t acpi_ec_irq_handler(int irq, void *data)
|
|
{
|
|
acpi_ec_handle_interrupt(data);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/* --------------------------------------------------------------------------
|
|
* Address Space Management
|
|
* -------------------------------------------------------------------------- */
|
|
|
|
static acpi_status
|
|
acpi_ec_space_handler(u32 function, acpi_physical_address address,
|
|
u32 bits, u64 *value64,
|
|
void *handler_context, void *region_context)
|
|
{
|
|
struct acpi_ec *ec = handler_context;
|
|
int result = 0, i, bytes = bits / 8;
|
|
u8 *value = (u8 *)value64;
|
|
|
|
if ((address > 0xFF) || !value || !handler_context)
|
|
return AE_BAD_PARAMETER;
|
|
|
|
if (function != ACPI_READ && function != ACPI_WRITE)
|
|
return AE_BAD_PARAMETER;
|
|
|
|
if (ec->busy_polling || bits > 8)
|
|
acpi_ec_burst_enable(ec);
|
|
|
|
for (i = 0; i < bytes; ++i, ++address, ++value)
|
|
result = (function == ACPI_READ) ?
|
|
acpi_ec_read(ec, address, value) :
|
|
acpi_ec_write(ec, address, *value);
|
|
|
|
if (ec->busy_polling || bits > 8)
|
|
acpi_ec_burst_disable(ec);
|
|
|
|
switch (result) {
|
|
case -EINVAL:
|
|
return AE_BAD_PARAMETER;
|
|
case -ENODEV:
|
|
return AE_NOT_FOUND;
|
|
case -ETIME:
|
|
return AE_TIME;
|
|
default:
|
|
return AE_OK;
|
|
}
|
|
}
|
|
|
|
/* --------------------------------------------------------------------------
|
|
* Driver Interface
|
|
* -------------------------------------------------------------------------- */
|
|
|
|
static acpi_status
|
|
ec_parse_io_ports(struct acpi_resource *resource, void *context);
|
|
|
|
static void acpi_ec_free(struct acpi_ec *ec)
|
|
{
|
|
if (first_ec == ec)
|
|
first_ec = NULL;
|
|
if (boot_ec == ec)
|
|
boot_ec = NULL;
|
|
kfree(ec);
|
|
}
|
|
|
|
static struct acpi_ec *acpi_ec_alloc(void)
|
|
{
|
|
struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL);
|
|
|
|
if (!ec)
|
|
return NULL;
|
|
mutex_init(&ec->mutex);
|
|
init_waitqueue_head(&ec->wait);
|
|
INIT_LIST_HEAD(&ec->list);
|
|
spin_lock_init(&ec->lock);
|
|
INIT_WORK(&ec->work, acpi_ec_event_handler);
|
|
ec->timestamp = jiffies;
|
|
ec->busy_polling = true;
|
|
ec->polling_guard = 0;
|
|
ec->gpe = -1;
|
|
ec->irq = -1;
|
|
return ec;
|
|
}
|
|
|
|
static acpi_status
|
|
acpi_ec_register_query_methods(acpi_handle handle, u32 level,
|
|
void *context, void **return_value)
|
|
{
|
|
char node_name[5];
|
|
struct acpi_buffer buffer = { sizeof(node_name), node_name };
|
|
struct acpi_ec *ec = context;
|
|
int value = 0;
|
|
acpi_status status;
|
|
|
|
status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
|
|
|
|
if (ACPI_SUCCESS(status) && sscanf(node_name, "_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;
|
|
unsigned long long tmp = 0;
|
|
struct acpi_ec *ec = context;
|
|
|
|
/* clear addr values, ec_parse_io_ports depend on it */
|
|
ec->command_addr = ec->data_addr = 0;
|
|
|
|
status = acpi_walk_resources(handle, METHOD_NAME__CRS,
|
|
ec_parse_io_ports, ec);
|
|
if (ACPI_FAILURE(status))
|
|
return status;
|
|
if (ec->data_addr == 0 || ec->command_addr == 0)
|
|
return AE_OK;
|
|
|
|
if (boot_ec && boot_ec_is_ecdt && EC_FLAGS_IGNORE_DSDT_GPE) {
|
|
/*
|
|
* Always inherit the GPE number setting from the ECDT
|
|
* EC.
|
|
*/
|
|
ec->gpe = boot_ec->gpe;
|
|
} else {
|
|
/* Get GPE bit assignment (EC events). */
|
|
/* TODO: Add support for _GPE returning a package */
|
|
status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp);
|
|
if (ACPI_SUCCESS(status))
|
|
ec->gpe = tmp;
|
|
|
|
/*
|
|
* Errors are non-fatal, allowing for ACPI Reduced Hardware
|
|
* platforms which use GpioInt instead of GPE.
|
|
*/
|
|
}
|
|
/* Use the global lock for all EC transactions? */
|
|
tmp = 0;
|
|
acpi_evaluate_integer(handle, "_GLK", NULL, &tmp);
|
|
ec->global_lock = tmp;
|
|
ec->handle = handle;
|
|
return AE_CTRL_TERMINATE;
|
|
}
|
|
|
|
static bool install_gpe_event_handler(struct acpi_ec *ec)
|
|
{
|
|
acpi_status status;
|
|
|
|
status = acpi_install_gpe_raw_handler(NULL, ec->gpe,
|
|
ACPI_GPE_EDGE_TRIGGERED,
|
|
&acpi_ec_gpe_handler, ec);
|
|
if (ACPI_FAILURE(status))
|
|
return false;
|
|
|
|
if (test_bit(EC_FLAGS_STARTED, &ec->flags) && ec->reference_count >= 1)
|
|
acpi_ec_enable_gpe(ec, true);
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool install_gpio_irq_event_handler(struct acpi_ec *ec)
|
|
{
|
|
return request_irq(ec->irq, acpi_ec_irq_handler, IRQF_SHARED,
|
|
"ACPI EC", ec) >= 0;
|
|
}
|
|
|
|
/**
|
|
* ec_install_handlers - Install service callbacks and register query methods.
|
|
* @ec: Target EC.
|
|
* @device: ACPI device object corresponding to @ec.
|
|
*
|
|
* Install a handler for the EC address space type unless it has been installed
|
|
* already. If @device is not NULL, also look for EC query methods in the
|
|
* namespace and register them, and install an event (either GPE or GPIO IRQ)
|
|
* handler for the EC, if possible.
|
|
*
|
|
* Return:
|
|
* -ENODEV if the address space handler cannot be installed, which means
|
|
* "unable to handle transactions",
|
|
* -EPROBE_DEFER if GPIO IRQ acquisition needs to be deferred,
|
|
* or 0 (success) otherwise.
|
|
*/
|
|
static int ec_install_handlers(struct acpi_ec *ec, struct acpi_device *device)
|
|
{
|
|
acpi_status status;
|
|
|
|
acpi_ec_start(ec, false);
|
|
|
|
if (!test_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags)) {
|
|
acpi_ec_enter_noirq(ec);
|
|
status = acpi_install_address_space_handler(ec->handle,
|
|
ACPI_ADR_SPACE_EC,
|
|
&acpi_ec_space_handler,
|
|
NULL, ec);
|
|
if (ACPI_FAILURE(status)) {
|
|
acpi_ec_stop(ec, false);
|
|
return -ENODEV;
|
|
}
|
|
set_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags);
|
|
}
|
|
|
|
if (!device)
|
|
return 0;
|
|
|
|
if (ec->gpe < 0) {
|
|
/* ACPI reduced hardware platforms use a GpioInt from _CRS. */
|
|
int irq = acpi_dev_gpio_irq_get(device, 0);
|
|
/*
|
|
* Bail out right away for deferred probing or complete the
|
|
* initialization regardless of any other errors.
|
|
*/
|
|
if (irq == -EPROBE_DEFER)
|
|
return -EPROBE_DEFER;
|
|
else if (irq >= 0)
|
|
ec->irq = irq;
|
|
}
|
|
|
|
if (!test_bit(EC_FLAGS_QUERY_METHODS_INSTALLED, &ec->flags)) {
|
|
/* Find and register all query methods */
|
|
acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1,
|
|
acpi_ec_register_query_methods,
|
|
NULL, ec, NULL);
|
|
set_bit(EC_FLAGS_QUERY_METHODS_INSTALLED, &ec->flags);
|
|
}
|
|
if (!test_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED, &ec->flags)) {
|
|
bool ready = false;
|
|
|
|
if (ec->gpe >= 0)
|
|
ready = install_gpe_event_handler(ec);
|
|
else if (ec->irq >= 0)
|
|
ready = install_gpio_irq_event_handler(ec);
|
|
|
|
if (ready) {
|
|
set_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED, &ec->flags);
|
|
acpi_ec_leave_noirq(ec);
|
|
}
|
|
/*
|
|
* Failures to install an event handler are not fatal, because
|
|
* the EC can be polled for events.
|
|
*/
|
|
}
|
|
/* EC is fully operational, allow queries */
|
|
acpi_ec_enable_event(ec);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ec_remove_handlers(struct acpi_ec *ec)
|
|
{
|
|
if (test_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags)) {
|
|
if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle,
|
|
ACPI_ADR_SPACE_EC, &acpi_ec_space_handler)))
|
|
pr_err("failed to remove space handler\n");
|
|
clear_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags);
|
|
}
|
|
|
|
/*
|
|
* Stops handling the EC transactions after removing the operation
|
|
* region handler. This is required because _REG(DISCONNECT)
|
|
* invoked during the removal can result in new EC transactions.
|
|
*
|
|
* Flushes the EC requests and thus disables the GPE before
|
|
* removing the GPE handler. This is required by the current ACPICA
|
|
* GPE core. ACPICA GPE core will automatically disable a GPE when
|
|
* it is indicated but there is no way to handle it. So the drivers
|
|
* must disable the GPEs prior to removing the GPE handlers.
|
|
*/
|
|
acpi_ec_stop(ec, false);
|
|
|
|
if (test_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED, &ec->flags)) {
|
|
if (ec->gpe >= 0 &&
|
|
ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe,
|
|
&acpi_ec_gpe_handler)))
|
|
pr_err("failed to remove gpe handler\n");
|
|
|
|
if (ec->irq >= 0)
|
|
free_irq(ec->irq, ec);
|
|
|
|
clear_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED, &ec->flags);
|
|
}
|
|
if (test_bit(EC_FLAGS_QUERY_METHODS_INSTALLED, &ec->flags)) {
|
|
acpi_ec_remove_query_handlers(ec, true, 0);
|
|
clear_bit(EC_FLAGS_QUERY_METHODS_INSTALLED, &ec->flags);
|
|
}
|
|
}
|
|
|
|
static int acpi_ec_setup(struct acpi_ec *ec, struct acpi_device *device)
|
|
{
|
|
int ret;
|
|
|
|
ret = ec_install_handlers(ec, device);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* First EC capable of handling transactions */
|
|
if (!first_ec)
|
|
first_ec = ec;
|
|
|
|
pr_info("EC_CMD/EC_SC=0x%lx, EC_DATA=0x%lx\n", ec->command_addr,
|
|
ec->data_addr);
|
|
|
|
if (test_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED, &ec->flags)) {
|
|
if (ec->gpe >= 0)
|
|
pr_info("GPE=0x%x\n", ec->gpe);
|
|
else
|
|
pr_info("IRQ=%d\n", ec->irq);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int acpi_ec_add(struct acpi_device *device)
|
|
{
|
|
struct acpi_ec *ec;
|
|
int ret;
|
|
|
|
strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
|
|
strcpy(acpi_device_class(device), ACPI_EC_CLASS);
|
|
|
|
if (boot_ec && (boot_ec->handle == device->handle ||
|
|
!strcmp(acpi_device_hid(device), ACPI_ECDT_HID))) {
|
|
/* Fast path: this device corresponds to the boot EC. */
|
|
ec = boot_ec;
|
|
} else {
|
|
acpi_status status;
|
|
|
|
ec = acpi_ec_alloc();
|
|
if (!ec)
|
|
return -ENOMEM;
|
|
|
|
status = ec_parse_device(device->handle, 0, ec, NULL);
|
|
if (status != AE_CTRL_TERMINATE) {
|
|
ret = -EINVAL;
|
|
goto err;
|
|
}
|
|
|
|
if (boot_ec && ec->command_addr == boot_ec->command_addr &&
|
|
ec->data_addr == boot_ec->data_addr &&
|
|
!EC_FLAGS_TRUST_DSDT_GPE) {
|
|
/*
|
|
* Trust PNP0C09 namespace location rather than
|
|
* ECDT ID. But trust ECDT GPE rather than _GPE
|
|
* because of ASUS quirks, so do not change
|
|
* boot_ec->gpe to ec->gpe.
|
|
*/
|
|
boot_ec->handle = ec->handle;
|
|
acpi_handle_debug(ec->handle, "duplicated.\n");
|
|
acpi_ec_free(ec);
|
|
ec = boot_ec;
|
|
}
|
|
}
|
|
|
|
ret = acpi_ec_setup(ec, device);
|
|
if (ret)
|
|
goto err;
|
|
|
|
if (ec == boot_ec)
|
|
acpi_handle_info(boot_ec->handle,
|
|
"Boot %s EC initialization complete\n",
|
|
boot_ec_is_ecdt ? "ECDT" : "DSDT");
|
|
|
|
acpi_handle_info(ec->handle,
|
|
"EC: Used to handle transactions and events\n");
|
|
|
|
device->driver_data = ec;
|
|
|
|
ret = !!request_region(ec->data_addr, 1, "EC data");
|
|
WARN(!ret, "Could not request EC data io port 0x%lx", ec->data_addr);
|
|
ret = !!request_region(ec->command_addr, 1, "EC cmd");
|
|
WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr);
|
|
|
|
/* Reprobe devices depending on the EC */
|
|
acpi_dev_clear_dependencies(device);
|
|
|
|
acpi_handle_debug(ec->handle, "enumerated.\n");
|
|
return 0;
|
|
|
|
err:
|
|
if (ec != boot_ec)
|
|
acpi_ec_free(ec);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int acpi_ec_remove(struct acpi_device *device)
|
|
{
|
|
struct acpi_ec *ec;
|
|
|
|
if (!device)
|
|
return -EINVAL;
|
|
|
|
ec = acpi_driver_data(device);
|
|
release_region(ec->data_addr, 1);
|
|
release_region(ec->command_addr, 1);
|
|
device->driver_data = NULL;
|
|
if (ec != boot_ec) {
|
|
ec_remove_handlers(ec);
|
|
acpi_ec_free(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 const struct acpi_device_id ec_device_ids[] = {
|
|
{"PNP0C09", 0},
|
|
{ACPI_ECDT_HID, 0},
|
|
{"", 0},
|
|
};
|
|
|
|
/*
|
|
* This function is not Windows-compatible as Windows never enumerates the
|
|
* namespace EC before the main ACPI device enumeration process. It is
|
|
* retained for historical reason and will be deprecated in the future.
|
|
*/
|
|
void __init acpi_ec_dsdt_probe(void)
|
|
{
|
|
struct acpi_ec *ec;
|
|
acpi_status status;
|
|
int ret;
|
|
|
|
/*
|
|
* If a platform has ECDT, there is no need to proceed as the
|
|
* following probe is not a part of the ACPI device enumeration,
|
|
* executing _STA is not safe, and thus this probe may risk of
|
|
* picking up an invalid EC device.
|
|
*/
|
|
if (boot_ec)
|
|
return;
|
|
|
|
ec = acpi_ec_alloc();
|
|
if (!ec)
|
|
return;
|
|
|
|
/*
|
|
* At this point, the namespace is initialized, so start to find
|
|
* the namespace objects.
|
|
*/
|
|
status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, ec, NULL);
|
|
if (ACPI_FAILURE(status) || !ec->handle) {
|
|
acpi_ec_free(ec);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* When the DSDT EC is available, always re-configure boot EC to
|
|
* have _REG evaluated. _REG can only be evaluated after the
|
|
* namespace initialization.
|
|
* At this point, the GPE is not fully initialized, so do not to
|
|
* handle the events.
|
|
*/
|
|
ret = acpi_ec_setup(ec, NULL);
|
|
if (ret) {
|
|
acpi_ec_free(ec);
|
|
return;
|
|
}
|
|
|
|
boot_ec = ec;
|
|
|
|
acpi_handle_info(ec->handle,
|
|
"Boot DSDT EC used to handle transactions\n");
|
|
}
|
|
|
|
/*
|
|
* acpi_ec_ecdt_start - Finalize the boot ECDT EC initialization.
|
|
*
|
|
* First, look for an ACPI handle for the boot ECDT EC if acpi_ec_add() has not
|
|
* found a matching object in the namespace.
|
|
*
|
|
* Next, in case the DSDT EC is not functioning, it is still necessary to
|
|
* provide a functional ECDT EC to handle events, so add an extra device object
|
|
* to represent it (see https://bugzilla.kernel.org/show_bug.cgi?id=115021).
|
|
*
|
|
* This is useful on platforms with valid ECDT and invalid DSDT EC settings,
|
|
* like ASUS X550ZE (see https://bugzilla.kernel.org/show_bug.cgi?id=196847).
|
|
*/
|
|
static void __init acpi_ec_ecdt_start(void)
|
|
{
|
|
struct acpi_table_ecdt *ecdt_ptr;
|
|
acpi_handle handle;
|
|
acpi_status status;
|
|
|
|
/* Bail out if a matching EC has been found in the namespace. */
|
|
if (!boot_ec || boot_ec->handle != ACPI_ROOT_OBJECT)
|
|
return;
|
|
|
|
/* Look up the object pointed to from the ECDT in the namespace. */
|
|
status = acpi_get_table(ACPI_SIG_ECDT, 1,
|
|
(struct acpi_table_header **)&ecdt_ptr);
|
|
if (ACPI_FAILURE(status))
|
|
return;
|
|
|
|
status = acpi_get_handle(NULL, ecdt_ptr->id, &handle);
|
|
if (ACPI_SUCCESS(status)) {
|
|
boot_ec->handle = handle;
|
|
|
|
/* Add a special ACPI device object to represent the boot EC. */
|
|
acpi_bus_register_early_device(ACPI_BUS_TYPE_ECDT_EC);
|
|
}
|
|
|
|
acpi_put_table((struct acpi_table_header *)ecdt_ptr);
|
|
}
|
|
|
|
/*
|
|
* On some hardware it is necessary to clear events accumulated by the EC during
|
|
* sleep. These ECs stop reporting GPEs until they are manually polled, if too
|
|
* many events are accumulated. (e.g. Samsung Series 5/9 notebooks)
|
|
*
|
|
* https://bugzilla.kernel.org/show_bug.cgi?id=44161
|
|
*
|
|
* Ideally, the EC should also be instructed NOT to accumulate events during
|
|
* sleep (which Windows seems to do somehow), but the interface to control this
|
|
* behaviour is not known at this time.
|
|
*
|
|
* Models known to be affected are Samsung 530Uxx/535Uxx/540Uxx/550Pxx/900Xxx,
|
|
* however it is very likely that other Samsung models are affected.
|
|
*
|
|
* On systems which don't accumulate _Q events during sleep, this extra check
|
|
* should be harmless.
|
|
*/
|
|
static int ec_clear_on_resume(const struct dmi_system_id *id)
|
|
{
|
|
pr_debug("Detected system needing EC poll on resume.\n");
|
|
EC_FLAGS_CLEAR_ON_RESUME = 1;
|
|
ec_event_clearing = ACPI_EC_EVT_TIMING_STATUS;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Some ECDTs contain wrong register addresses.
|
|
* MSI MS-171F
|
|
* https://bugzilla.kernel.org/show_bug.cgi?id=12461
|
|
*/
|
|
static int ec_correct_ecdt(const struct dmi_system_id *id)
|
|
{
|
|
pr_debug("Detected system needing ECDT address correction.\n");
|
|
EC_FLAGS_CORRECT_ECDT = 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Some ECDTs contain wrong GPE setting, but they share the same port addresses
|
|
* with DSDT EC, don't duplicate the DSDT EC with ECDT EC in this case.
|
|
* https://bugzilla.kernel.org/show_bug.cgi?id=209989
|
|
*/
|
|
static int ec_honor_dsdt_gpe(const struct dmi_system_id *id)
|
|
{
|
|
pr_debug("Detected system needing DSDT GPE setting.\n");
|
|
EC_FLAGS_TRUST_DSDT_GPE = 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Some DSDTs contain wrong GPE setting.
|
|
* Asus FX502VD/VE, GL702VMK, X550VXK, X580VD
|
|
* https://bugzilla.kernel.org/show_bug.cgi?id=195651
|
|
*/
|
|
static int ec_honor_ecdt_gpe(const struct dmi_system_id *id)
|
|
{
|
|
pr_debug("Detected system needing ignore DSDT GPE setting.\n");
|
|
EC_FLAGS_IGNORE_DSDT_GPE = 1;
|
|
return 0;
|
|
}
|
|
|
|
static const struct dmi_system_id ec_dmi_table[] __initconst = {
|
|
{
|
|
ec_correct_ecdt, "MSI MS-171F", {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "MS-171F"),}, NULL},
|
|
{
|
|
ec_honor_ecdt_gpe, "ASUS FX502VD", {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "FX502VD"),}, NULL},
|
|
{
|
|
ec_honor_ecdt_gpe, "ASUS FX502VE", {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "FX502VE"),}, NULL},
|
|
{
|
|
ec_honor_ecdt_gpe, "ASUS GL702VMK", {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "GL702VMK"),}, NULL},
|
|
{
|
|
ec_honor_ecdt_gpe, "ASUSTeK COMPUTER INC. X505BA", {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "X505BA"),}, NULL},
|
|
{
|
|
ec_honor_ecdt_gpe, "ASUSTeK COMPUTER INC. X505BP", {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "X505BP"),}, NULL},
|
|
{
|
|
ec_honor_ecdt_gpe, "ASUSTeK COMPUTER INC. X542BA", {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "X542BA"),}, NULL},
|
|
{
|
|
ec_honor_ecdt_gpe, "ASUSTeK COMPUTER INC. X542BP", {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "X542BP"),}, NULL},
|
|
{
|
|
ec_honor_ecdt_gpe, "ASUS X550VXK", {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "X550VXK"),}, NULL},
|
|
{
|
|
ec_honor_ecdt_gpe, "ASUS X580VD", {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "X580VD"),}, NULL},
|
|
{
|
|
/* https://bugzilla.kernel.org/show_bug.cgi?id=209989 */
|
|
ec_honor_dsdt_gpe, "HP Pavilion Gaming Laptop 15-cx0xxx", {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "HP"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion Gaming Laptop 15-cx0xxx"),}, NULL},
|
|
{
|
|
ec_clear_on_resume, "Samsung hardware", {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD.")}, NULL},
|
|
{},
|
|
};
|
|
|
|
void __init acpi_ec_ecdt_probe(void)
|
|
{
|
|
struct acpi_table_ecdt *ecdt_ptr;
|
|
struct acpi_ec *ec;
|
|
acpi_status status;
|
|
int ret;
|
|
|
|
/* Generate a boot ec context. */
|
|
dmi_check_system(ec_dmi_table);
|
|
status = acpi_get_table(ACPI_SIG_ECDT, 1,
|
|
(struct acpi_table_header **)&ecdt_ptr);
|
|
if (ACPI_FAILURE(status))
|
|
return;
|
|
|
|
if (!ecdt_ptr->control.address || !ecdt_ptr->data.address) {
|
|
/*
|
|
* Asus X50GL:
|
|
* https://bugzilla.kernel.org/show_bug.cgi?id=11880
|
|
*/
|
|
goto out;
|
|
}
|
|
|
|
ec = acpi_ec_alloc();
|
|
if (!ec)
|
|
goto out;
|
|
|
|
if (EC_FLAGS_CORRECT_ECDT) {
|
|
ec->command_addr = ecdt_ptr->data.address;
|
|
ec->data_addr = ecdt_ptr->control.address;
|
|
} else {
|
|
ec->command_addr = ecdt_ptr->control.address;
|
|
ec->data_addr = ecdt_ptr->data.address;
|
|
}
|
|
|
|
/*
|
|
* Ignore the GPE value on Reduced Hardware platforms.
|
|
* Some products have this set to an erroneous value.
|
|
*/
|
|
if (!acpi_gbl_reduced_hardware)
|
|
ec->gpe = ecdt_ptr->gpe;
|
|
|
|
ec->handle = ACPI_ROOT_OBJECT;
|
|
|
|
/*
|
|
* At this point, the namespace is not initialized, so do not find
|
|
* the namespace objects, or handle the events.
|
|
*/
|
|
ret = acpi_ec_setup(ec, NULL);
|
|
if (ret) {
|
|
acpi_ec_free(ec);
|
|
goto out;
|
|
}
|
|
|
|
boot_ec = ec;
|
|
boot_ec_is_ecdt = true;
|
|
|
|
pr_info("Boot ECDT EC used to handle transactions\n");
|
|
|
|
out:
|
|
acpi_put_table((struct acpi_table_header *)ecdt_ptr);
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int acpi_ec_suspend(struct device *dev)
|
|
{
|
|
struct acpi_ec *ec =
|
|
acpi_driver_data(to_acpi_device(dev));
|
|
|
|
if (!pm_suspend_no_platform() && ec_freeze_events)
|
|
acpi_ec_disable_event(ec);
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_ec_suspend_noirq(struct device *dev)
|
|
{
|
|
struct acpi_ec *ec = acpi_driver_data(to_acpi_device(dev));
|
|
|
|
/*
|
|
* The SCI handler doesn't run at this point, so the GPE can be
|
|
* masked at the low level without side effects.
|
|
*/
|
|
if (ec_no_wakeup && test_bit(EC_FLAGS_STARTED, &ec->flags) &&
|
|
ec->gpe >= 0 && ec->reference_count >= 1)
|
|
acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE);
|
|
|
|
acpi_ec_enter_noirq(ec);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_ec_resume_noirq(struct device *dev)
|
|
{
|
|
struct acpi_ec *ec = acpi_driver_data(to_acpi_device(dev));
|
|
|
|
acpi_ec_leave_noirq(ec);
|
|
|
|
if (ec_no_wakeup && test_bit(EC_FLAGS_STARTED, &ec->flags) &&
|
|
ec->gpe >= 0 && ec->reference_count >= 1)
|
|
acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_ec_resume(struct device *dev)
|
|
{
|
|
struct acpi_ec *ec =
|
|
acpi_driver_data(to_acpi_device(dev));
|
|
|
|
acpi_ec_enable_event(ec);
|
|
return 0;
|
|
}
|
|
|
|
void acpi_ec_mark_gpe_for_wake(void)
|
|
{
|
|
if (first_ec && !ec_no_wakeup)
|
|
acpi_mark_gpe_for_wake(NULL, first_ec->gpe);
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_ec_mark_gpe_for_wake);
|
|
|
|
void acpi_ec_set_gpe_wake_mask(u8 action)
|
|
{
|
|
if (pm_suspend_no_platform() && first_ec && !ec_no_wakeup)
|
|
acpi_set_gpe_wake_mask(NULL, first_ec->gpe, action);
|
|
}
|
|
|
|
bool acpi_ec_dispatch_gpe(void)
|
|
{
|
|
bool work_in_progress = false;
|
|
|
|
if (!first_ec)
|
|
return acpi_any_gpe_status_set(U32_MAX);
|
|
|
|
/*
|
|
* Report wakeup if the status bit is set for any enabled GPE other
|
|
* than the EC one.
|
|
*/
|
|
if (acpi_any_gpe_status_set(first_ec->gpe))
|
|
return true;
|
|
|
|
/*
|
|
* Dispatch the EC GPE in-band, but do not report wakeup in any case
|
|
* to allow the caller to process events properly after that.
|
|
*/
|
|
spin_lock_irq(&first_ec->lock);
|
|
|
|
if (acpi_ec_gpe_status_set(first_ec))
|
|
work_in_progress = advance_transaction(first_ec, false);
|
|
|
|
spin_unlock_irq(&first_ec->lock);
|
|
|
|
if (!work_in_progress)
|
|
return false;
|
|
|
|
pm_pr_dbg("ACPI EC GPE dispatched\n");
|
|
|
|
/* Drain EC work. */
|
|
do {
|
|
acpi_ec_flush_work();
|
|
|
|
pm_pr_dbg("ACPI EC work flushed\n");
|
|
|
|
spin_lock_irq(&first_ec->lock);
|
|
|
|
work_in_progress = first_ec->events_in_progress +
|
|
first_ec->queries_in_progress > 0;
|
|
|
|
spin_unlock_irq(&first_ec->lock);
|
|
} while (work_in_progress && !pm_wakeup_pending());
|
|
|
|
return false;
|
|
}
|
|
#endif /* CONFIG_PM_SLEEP */
|
|
|
|
static const struct dev_pm_ops acpi_ec_pm = {
|
|
SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(acpi_ec_suspend_noirq, acpi_ec_resume_noirq)
|
|
SET_SYSTEM_SLEEP_PM_OPS(acpi_ec_suspend, acpi_ec_resume)
|
|
};
|
|
|
|
static int param_set_event_clearing(const char *val,
|
|
const struct kernel_param *kp)
|
|
{
|
|
int result = 0;
|
|
|
|
if (!strncmp(val, "status", sizeof("status") - 1)) {
|
|
ec_event_clearing = ACPI_EC_EVT_TIMING_STATUS;
|
|
pr_info("Assuming SCI_EVT clearing on EC_SC accesses\n");
|
|
} else if (!strncmp(val, "query", sizeof("query") - 1)) {
|
|
ec_event_clearing = ACPI_EC_EVT_TIMING_QUERY;
|
|
pr_info("Assuming SCI_EVT clearing on QR_EC writes\n");
|
|
} else if (!strncmp(val, "event", sizeof("event") - 1)) {
|
|
ec_event_clearing = ACPI_EC_EVT_TIMING_EVENT;
|
|
pr_info("Assuming SCI_EVT clearing on event reads\n");
|
|
} else
|
|
result = -EINVAL;
|
|
return result;
|
|
}
|
|
|
|
static int param_get_event_clearing(char *buffer,
|
|
const struct kernel_param *kp)
|
|
{
|
|
switch (ec_event_clearing) {
|
|
case ACPI_EC_EVT_TIMING_STATUS:
|
|
return sprintf(buffer, "status\n");
|
|
case ACPI_EC_EVT_TIMING_QUERY:
|
|
return sprintf(buffer, "query\n");
|
|
case ACPI_EC_EVT_TIMING_EVENT:
|
|
return sprintf(buffer, "event\n");
|
|
default:
|
|
return sprintf(buffer, "invalid\n");
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
module_param_call(ec_event_clearing, param_set_event_clearing, param_get_event_clearing,
|
|
NULL, 0644);
|
|
MODULE_PARM_DESC(ec_event_clearing, "Assumed SCI_EVT clearing timing");
|
|
|
|
static struct acpi_driver acpi_ec_driver = {
|
|
.name = "ec",
|
|
.class = ACPI_EC_CLASS,
|
|
.ids = ec_device_ids,
|
|
.ops = {
|
|
.add = acpi_ec_add,
|
|
.remove = acpi_ec_remove,
|
|
},
|
|
.drv.pm = &acpi_ec_pm,
|
|
};
|
|
|
|
static void acpi_ec_destroy_workqueues(void)
|
|
{
|
|
if (ec_wq) {
|
|
destroy_workqueue(ec_wq);
|
|
ec_wq = NULL;
|
|
}
|
|
if (ec_query_wq) {
|
|
destroy_workqueue(ec_query_wq);
|
|
ec_query_wq = NULL;
|
|
}
|
|
}
|
|
|
|
static int acpi_ec_init_workqueues(void)
|
|
{
|
|
if (!ec_wq)
|
|
ec_wq = alloc_ordered_workqueue("kec", 0);
|
|
|
|
if (!ec_query_wq)
|
|
ec_query_wq = alloc_workqueue("kec_query", 0, ec_max_queries);
|
|
|
|
if (!ec_wq || !ec_query_wq) {
|
|
acpi_ec_destroy_workqueues();
|
|
return -ENODEV;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct dmi_system_id acpi_ec_no_wakeup[] = {
|
|
{
|
|
.ident = "Thinkpad X1 Carbon 6th",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
|
|
DMI_MATCH(DMI_PRODUCT_FAMILY, "Thinkpad X1 Carbon 6th"),
|
|
},
|
|
},
|
|
{
|
|
.ident = "ThinkPad X1 Carbon 6th",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
|
|
DMI_MATCH(DMI_PRODUCT_FAMILY, "ThinkPad X1 Carbon 6th"),
|
|
},
|
|
},
|
|
{
|
|
.ident = "ThinkPad X1 Yoga 3rd",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
|
|
DMI_MATCH(DMI_PRODUCT_FAMILY, "ThinkPad X1 Yoga 3rd"),
|
|
},
|
|
},
|
|
{
|
|
.ident = "HP ZHAN 66 Pro",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "HP"),
|
|
DMI_MATCH(DMI_PRODUCT_FAMILY, "103C_5336AN HP ZHAN 66 Pro"),
|
|
},
|
|
},
|
|
{ },
|
|
};
|
|
|
|
void __init acpi_ec_init(void)
|
|
{
|
|
int result;
|
|
|
|
result = acpi_ec_init_workqueues();
|
|
if (result)
|
|
return;
|
|
|
|
/*
|
|
* Disable EC wakeup on following systems to prevent periodic
|
|
* wakeup from EC GPE.
|
|
*/
|
|
if (dmi_check_system(acpi_ec_no_wakeup)) {
|
|
ec_no_wakeup = true;
|
|
pr_debug("Disabling EC wakeup on suspend-to-idle\n");
|
|
}
|
|
|
|
/* Driver must be registered after acpi_ec_init_workqueues(). */
|
|
acpi_bus_register_driver(&acpi_ec_driver);
|
|
|
|
acpi_ec_ecdt_start();
|
|
}
|
|
|
|
/* EC driver currently not unloadable */
|
|
#if 0
|
|
static void __exit acpi_ec_exit(void)
|
|
{
|
|
|
|
acpi_bus_unregister_driver(&acpi_ec_driver);
|
|
acpi_ec_destroy_workqueues();
|
|
}
|
|
#endif /* 0 */
|