Something went wrong. Try again.
(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
Something went wrong. Try again.
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629630631632633634635636637638639640641642643644645646647648649650651652653654655656657658659660661662663664665666667668669670671672673674675676677678679680681682683684685686687688689690691692693694695696697698699700701702703704705706707708709710711712713714715716717718719720721722723724725726727728729730731732733734735736737738739740741742743744745746747748749750751752753754755756757758759760761762763764765766767768769770771772773774775776777778779780781782783784785786787788789790791792793794795796797798799800801802803804805806807808809810811812813814815816817818819820821822823824825826827828829830831832833834835836837838839840841842843844845846847848849850851852853854855856857858859860861862863864865866867868869870871872873874875876877878879880881882883884885886887888889890891892893894895896897898899900901902903904905906907908909910911912913914915916917918919920921922923924925926927928929930931932933934935936937938939940941942943944945946947948949950951952953954955956957958959960961962963964965966967968969970971972973974975976977978979980981982983984985986987988989990991992993994995996997998999100010011002100310041005100610071008100910101011101210131014101510161017101810191020102110221023102410251026102710281029103010311032103310341035103610371038103910401041104210431044104510461047104810491050105110521053105410551056105710581059106010611062106310641065106610671068106910701071107210731074107510761077107810791080108110821083108410851086108710881089109010911092109310941095109610971098109911001101110211031104110511061107110811091110111111121113111411151116111711181119112011211122112311241125112611271128112911301131113211331134113511361137113811391140114111421143114411451146114711481149115011511152115311541155115611571158115911601161116211631164116511661167116811691170117111721173117411751176117711781179118011811182118311841185118611871188118911901191119211931194119511961197119811991200120112021203120412051206120712081209121012111212121312141215121612171218121912201221122212231224122512261227122812291230123112321233123412351236123712381239124012411242124312441245124612471248124912501251125212531254125512561257125812591260126112621263126412651266126712681269127012711272127312741275127612771278127912801281128212831284128512861287128812891290129112921293129412951296129712981299130013011302130313041305130613071308130913101311131213131314131513161317131813191320132113221323132413251326132713281329133013311332133313341335133613371338133913401341134213431344134513461347134813491350135113521353135413551356135713581359136013611362136313641365136613671368136913701371137213731374137513761377137813791380138113821383138413851386138713881389139013911392139313941395139613971398139914001401140214031404140514061407140814091410141114121413141414151416141714181419142014211422142314241425142614271428142914301431143214331434143514361437143814391440144114421443144414451446144714481449145014511452145314541455145614571458145914601461146214631464146514661467146814691470147114721473147414751476147714781479148014811482148314841485148614871488148914901491149214931494149514961497149814991500150115021503150415051506150715081509151015111512151315141515151615171518151915201521152215231524152515261527152815291530153115321533153415351536153715381539154015411542154315441545154615471548154915501551155215531554155515561557155815591560156115621563156415651566156715681569157015711572157315741575157615771578157915801581158215831584158515861587158815891590159115921593159415951596159715981599160016011602160316041605160616071608160916101611161216131614161516161617161816191620162116221623162416251626162716281629163016311632163316341635163616371638163916401641164216431644164516461647164816491650165116521653165416551656165716581659166016611662166316641665166616671668166916701671167216731674167516761677167816791680168116821683168416851686168716881689169016911692169316941695169616971698169917001701170217031704170517061707170817091710171117121713171417151716171717181719172017211722172317241725172617271728172917301731173217331734173517361737173817391740174117421743174417451746174717481749175017511752175317541755175617571758175917601761176217631764176517661767176817691770177117721773177417751776177717781779178017811782178317841785178617871788178917901791179217931794179517961797179817991800180118021803180418051806180718081809181018111812181318141815181618171818181918201821182218231824182518261827182818291830183118321833183418351836183718381839184018411842184318441845184618471848184918501851185218531854185518561857185818591860186118621863186418651866186718681869187018711872187318741875187618771878187918801881188218831884188518861887188818891890189118921893189418951896189718981899190019011902190319041905190619071908190919101911191219131914191519161917191819191920192119221923192419251926192719281929193019311932193319341935193619371938193919401941194219431944194519461947194819491950195119521953195419551956195719581959196019611962196319641965196619671968196919701971197219731974197519761977197819791980198119821983198419851986198719881989199019911992199319941995199619971998199920002001200220032004200520062007200820092010201120122013201420152016201720182019202020212022202320242025202620272028202920302031203220332034203520362037203820392040204120422043204420452046204720482049205020512052205320542055205620572058205920602061206220632064206520662067206820692070207120722073207420752076207720782079208020812082208320842085208620872088208920902091209220932094209520962097209820992100210121022103210421052106210721082109211021112112211321142115211621172118211921202121212221232124212521262127212821292130213121322133213421352136213721382139214021412142214321442145214621472148214921502151215221532154215521562157215821592160216121622163216421652166216721682169217021712172217321742175217621772178217921802181218221832184218521862187218821892190219121922193219421952196219721982199220022012202220322042205220622072208220922102211221222132214221522162217221822192220222122222223222422252226222722282229223022312232223322342235223622372238223922402241224222432244224522462247224822492250225122522253225422552256225722582259226022612262226322642265226622672268226922702271227222732274227522762277227822792280228122822283228422852286228722882289229022912292229322942295229622972298229923002301230223032304230523062307230823092310231123122313231423152316231723182319232023212322232323242325232623272328232923302331233223332334233523362337233823392340234123422343234423452346234723482349235023512352235323542355235623572358235923602361236223632364236523662367236823692370237123722373237423752376237723782379238023812382238323842385238623872388238923902391// SPDX-License-Identifier: GPL-2.0-or-later/* * ec.c - ACPI Embedded Controller Driver (v3) * * Copyright (C) 2001-2015 Intel Corporation * Author: 2014, 2015 Lv Zheng <lv.zheng@intel.com> * 2006, 2007 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com> * 2006 Denis Sadykov <denis.m.sadykov@intel.com> * 2004 Luming Yu <luming.yu@intel.com> * 2001, 2002 Andy Grover <andrew.grover@intel.com> * 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> * Copyright (C) 2008 Alexey Starikovskiy <astarikovskiy@suse.de> */
/* Uncomment next line to get verbose printout *//* #define DEBUG */#define pr_fmt(fmt) "ACPI: EC: " fmt
#include <linux/kernel.h>#include <linux/module.h>#include <linux/init.h>#include <linux/types.h>#include <linux/delay.h>#include <linux/interrupt.h>#include <linux/list.h>#include <linux/platform_device.h>#include <linux/printk.h>#include <linux/spinlock.h>#include <linux/slab.h>#include <linux/string.h>#include <linux/suspend.h>#include <linux/acpi.h>#include <linux/dmi.h>#include <asm/io.h>
#include "internal.h"
/* EC status register */#define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */#define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */#define ACPI_EC_FLAG_CMD 0x08 /* Input buffer contains a command */#define ACPI_EC_FLAG_BURST 0x10 /* burst mode */#define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */
/* * The SCI_EVT clearing timing is not defined by the ACPI specification. * This leads to lots of practical timing issues for the host EC driver. * The following variations are defined (from the target EC firmware's * perspective): * STATUS: After indicating SCI_EVT edge triggered IRQ to the host, the * target can clear SCI_EVT at any time so long as the host can see * the indication by reading the status register (EC_SC). So the * host should re-check SCI_EVT after the first time the SCI_EVT * indication is seen, which is the same time the query request * (QR_EC) is written to the command register (EC_CMD). SCI_EVT set * at any later time could indicate another event. Normally such * kind of EC firmware has implemented an event queue and will * return 0x00 to indicate "no outstanding event". * QUERY: After seeing the query request (QR_EC) written to the command * register (EC_CMD) by the host and having prepared the responding * event value in the data register (EC_DATA), the target can safely * clear SCI_EVT because the target can confirm that the current * event is being handled by the host. The host then should check * SCI_EVT right after reading the event response from the data * register (EC_DATA). * EVENT: After seeing the event response read from the data register * (EC_DATA) by the host, the target can clear SCI_EVT. As the * target requires time to notice the change in the data register * (EC_DATA), the host may be required to wait additional guarding * time before checking the SCI_EVT again. Such guarding may not be * necessary if the host is notified via another IRQ. */#define ACPI_EC_EVT_TIMING_STATUS 0x00#define ACPI_EC_EVT_TIMING_QUERY 0x01#define ACPI_EC_EVT_TIMING_EVENT 0x02
/* EC commands */enum ec_command { ACPI_EC_COMMAND_READ = 0x80, ACPI_EC_COMMAND_WRITE = 0x81, ACPI_EC_BURST_ENABLE = 0x82, ACPI_EC_BURST_DISABLE = 0x83, ACPI_EC_COMMAND_QUERY = 0x84,};
#define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */#define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */#define ACPI_EC_UDELAY_POLL 550 /* Wait 1ms for EC transaction polling */#define ACPI_EC_CLEAR_MAX 100 /* Maximum number of events to query * when trying to clear the EC */#define ACPI_EC_MAX_QUERIES 16 /* Maximum number of parallel queries */
enum { EC_FLAGS_QUERY_ENABLED, /* Query is enabled */ EC_FLAGS_EVENT_HANDLER_INSTALLED, /* Event handler installed */ EC_FLAGS_EC_HANDLER_INSTALLED, /* OpReg handler installed */ EC_FLAGS_EC_REG_CALLED, /* OpReg ACPI _REG method called */ EC_FLAGS_QUERY_METHODS_INSTALLED, /* _Qxx handlers installed */ EC_FLAGS_STARTED, /* Driver is started */ EC_FLAGS_STOPPED, /* Driver is stopped */ EC_FLAGS_EVENTS_MASKED, /* Events masked */};
#define ACPI_EC_COMMAND_POLL 0x01 /* Available for command byte */#define ACPI_EC_COMMAND_COMPLETE 0x02 /* Completed last byte */
/* ec.c is compiled in acpi namespace so this shows up as acpi.ec_delay param */static unsigned int ec_delay __read_mostly = ACPI_EC_DELAY;module_param(ec_delay, uint, 0644);MODULE_PARM_DESC(ec_delay, "Timeout(ms) waited until an EC command completes");
static unsigned int ec_max_queries __read_mostly = ACPI_EC_MAX_QUERIES;module_param(ec_max_queries, uint, 0644);MODULE_PARM_DESC(ec_max_queries, "Maximum parallel _Qxx evaluations");
static bool ec_busy_polling __read_mostly;module_param(ec_busy_polling, bool, 0644);MODULE_PARM_DESC(ec_busy_polling, "Use busy polling to advance EC transaction");
static unsigned int ec_polling_guard __read_mostly = ACPI_EC_UDELAY_POLL;module_param(ec_polling_guard, uint, 0644);MODULE_PARM_DESC(ec_polling_guard, "Guard time(us) between EC accesses in polling modes");
static unsigned int ec_event_clearing __read_mostly = ACPI_EC_EVT_TIMING_QUERY;
/* * If the number of false interrupts per one transaction exceeds * this threshold, will think there is a GPE storm happened and * will disable the GPE for normal transaction. */static unsigned int ec_storm_threshold __read_mostly = 8;module_param(ec_storm_threshold, uint, 0644);MODULE_PARM_DESC(ec_storm_threshold, "Maxim false GPE numbers not considered as GPE storm");
static bool ec_freeze_events __read_mostly;module_param(ec_freeze_events, bool, 0644);MODULE_PARM_DESC(ec_freeze_events, "Disabling event handling during suspend/resume");
static bool ec_no_wakeup __read_mostly;module_param(ec_no_wakeup, bool, 0644);MODULE_PARM_DESC(ec_no_wakeup, "Do not wake up from suspend-to-idle");
struct acpi_ec_query_handler { struct list_head node; acpi_ec_query_func func; acpi_handle handle; void *data; u8 query_bit; struct kref kref;};
struct transaction { const u8 *wdata; u8 *rdata; unsigned short irq_count; u8 command; u8 wi; u8 ri; u8 wlen; u8 rlen; u8 flags;};
struct acpi_ec_query { struct transaction transaction; struct work_struct work; struct acpi_ec_query_handler *handler; struct acpi_ec *ec;};
static int acpi_ec_submit_query(struct acpi_ec *ec);static void advance_transaction(struct acpi_ec *ec, bool interrupt);static void acpi_ec_event_handler(struct work_struct *work);
struct acpi_ec *first_ec;EXPORT_SYMBOL(first_ec);
static struct acpi_ec *boot_ec;static bool boot_ec_is_ecdt;static struct workqueue_struct *ec_wq;static struct workqueue_struct *ec_query_wq;
static int EC_FLAGS_CORRECT_ECDT; /* Needs ECDT port address correction */static int EC_FLAGS_TRUST_DSDT_GPE; /* Needs DSDT GPE as correction setting */static int EC_FLAGS_CLEAR_ON_RESUME; /* Needs acpi_ec_clear() on boot/resume */
/* -------------------------------------------------------------------------- * Logging/Debugging * -------------------------------------------------------------------------- */
/* * Splitters used by the developers to track the boundary of the EC * handling processes. */#ifdef DEBUG#define EC_DBG_SEP " "#define EC_DBG_DRV "+++++"#define EC_DBG_STM "====="#define EC_DBG_REQ "*****"#define EC_DBG_EVT "#####"#else#define EC_DBG_SEP ""#define EC_DBG_DRV#define EC_DBG_STM#define EC_DBG_REQ#define EC_DBG_EVT#endif
#define ec_log_raw(fmt, ...) \ pr_info(fmt "\n", ##__VA_ARGS__)#define ec_dbg_raw(fmt, ...) \ pr_debug(fmt "\n", ##__VA_ARGS__)#define ec_log(filter, fmt, ...) \ ec_log_raw(filter EC_DBG_SEP fmt EC_DBG_SEP filter, ##__VA_ARGS__)#define ec_dbg(filter, fmt, ...) \ ec_dbg_raw(filter EC_DBG_SEP fmt EC_DBG_SEP filter, ##__VA_ARGS__)
#define ec_log_drv(fmt, ...) \ ec_log(EC_DBG_DRV, fmt, ##__VA_ARGS__)#define ec_dbg_drv(fmt, ...) \ ec_dbg(EC_DBG_DRV, fmt, ##__VA_ARGS__)#define ec_dbg_stm(fmt, ...) \ ec_dbg(EC_DBG_STM, fmt, ##__VA_ARGS__)#define ec_dbg_req(fmt, ...) \ ec_dbg(EC_DBG_REQ, fmt, ##__VA_ARGS__)#define ec_dbg_evt(fmt, ...) \ ec_dbg(EC_DBG_EVT, fmt, ##__VA_ARGS__)#define ec_dbg_ref(ec, fmt, ...) \ ec_dbg_raw("%lu: " fmt, ec->reference_count, ## __VA_ARGS__)
/* -------------------------------------------------------------------------- * Device Flags * -------------------------------------------------------------------------- */
static bool acpi_ec_started(struct acpi_ec *ec){ return test_bit(EC_FLAGS_STARTED, &ec->flags) && !test_bit(EC_FLAGS_STOPPED, &ec->flags);}
static bool acpi_ec_event_enabled(struct acpi_ec *ec){ /* * There is an OSPM early stage logic. During the early stages * (boot/resume), OSPMs shouldn't enable the event handling, only * the EC transactions are allowed to be performed. */ if (!test_bit(EC_FLAGS_QUERY_ENABLED, &ec->flags)) return false; /* * However, disabling the event handling is experimental for late * stage (suspend), and is controlled by the boot parameter of * "ec_freeze_events": * 1. true: The EC event handling is disabled before entering * the noirq stage. * 2. false: The EC event handling is automatically disabled as * soon as the EC driver is stopped. */ if (ec_freeze_events) return acpi_ec_started(ec); else return test_bit(EC_FLAGS_STARTED, &ec->flags);}
static bool acpi_ec_flushed(struct acpi_ec *ec){ return ec->reference_count == 1;}
/* -------------------------------------------------------------------------- * EC Registers * -------------------------------------------------------------------------- */
static inline u8 acpi_ec_read_status(struct acpi_ec *ec){ u8 x = inb(ec->command_addr);
ec_dbg_raw("EC_SC(R) = 0x%2.2x " "SCI_EVT=%d BURST=%d CMD=%d IBF=%d OBF=%d", x, !!(x & ACPI_EC_FLAG_SCI), !!(x & ACPI_EC_FLAG_BURST), !!(x & ACPI_EC_FLAG_CMD), !!(x & ACPI_EC_FLAG_IBF), !!(x & ACPI_EC_FLAG_OBF)); return x;}
static inline u8 acpi_ec_read_data(struct acpi_ec *ec){ u8 x = inb(ec->data_addr);
ec->timestamp = jiffies; ec_dbg_raw("EC_DATA(R) = 0x%2.2x", x); return x;}
static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command){ ec_dbg_raw("EC_SC(W) = 0x%2.2x", command); outb(command, ec->command_addr); ec->timestamp = jiffies;}
static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data){ ec_dbg_raw("EC_DATA(W) = 0x%2.2x", data); outb(data, ec->data_addr); ec->timestamp = jiffies;}
#if defined(DEBUG) || defined(CONFIG_DYNAMIC_DEBUG)static const char *acpi_ec_cmd_string(u8 cmd){ switch (cmd) { case 0x80: return "RD_EC"; case 0x81: return "WR_EC"; case 0x82: return "BE_EC"; case 0x83: return "BD_EC"; case 0x84: return "QR_EC"; } return "UNKNOWN";}#else#define acpi_ec_cmd_string(cmd) "UNDEF"#endif
/* -------------------------------------------------------------------------- * GPE Registers * -------------------------------------------------------------------------- */
static inline bool acpi_ec_gpe_status_set(struct acpi_ec *ec){ acpi_event_status gpe_status = 0;
(void)acpi_get_gpe_status(NULL, ec->gpe, &gpe_status); return !!(gpe_status & ACPI_EVENT_FLAG_STATUS_SET);}
static inline void acpi_ec_enable_gpe(struct acpi_ec *ec, bool open){ if (open) acpi_enable_gpe(NULL, ec->gpe); else { BUG_ON(ec->reference_count < 1); acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE); } if (acpi_ec_gpe_status_set(ec)) { /* * On some platforms, EN=1 writes cannot trigger GPE. So * software need to manually trigger a pseudo GPE event on * EN=1 writes. */ ec_dbg_raw("Polling quirk"); advance_transaction(ec, false); }}
static inline void acpi_ec_disable_gpe(struct acpi_ec *ec, bool close){ if (close) acpi_disable_gpe(NULL, ec->gpe); else { BUG_ON(ec->reference_count < 1); acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE); }}
/* -------------------------------------------------------------------------- * Transaction Management * -------------------------------------------------------------------------- */
static void acpi_ec_submit_request(struct acpi_ec *ec){ ec->reference_count++; if (test_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED, &ec->flags) && ec->gpe >= 0 && ec->reference_count == 1) acpi_ec_enable_gpe(ec, true);}
static void acpi_ec_complete_request(struct acpi_ec *ec){ bool flushed = false;
ec->reference_count--; if (test_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED, &ec->flags) && ec->gpe >= 0 && ec->reference_count == 0) acpi_ec_disable_gpe(ec, true); flushed = acpi_ec_flushed(ec); if (flushed) wake_up(&ec->wait);}
static void acpi_ec_mask_events(struct acpi_ec *ec){ if (!test_bit(EC_FLAGS_EVENTS_MASKED, &ec->flags)) { if (ec->gpe >= 0) acpi_ec_disable_gpe(ec, false); else disable_irq_nosync(ec->irq);
ec_dbg_drv("Polling enabled"); set_bit(EC_FLAGS_EVENTS_MASKED, &ec->flags); }}
static void acpi_ec_unmask_events(struct acpi_ec *ec){ if (test_bit(EC_FLAGS_EVENTS_MASKED, &ec->flags)) { clear_bit(EC_FLAGS_EVENTS_MASKED, &ec->flags); if (ec->gpe >= 0) acpi_ec_enable_gpe(ec, false); else enable_irq(ec->irq);
ec_dbg_drv("Polling disabled"); }}
/* * acpi_ec_submit_flushable_request() - Increase the reference count unless * the flush operation is not in * progress * @ec: the EC device * * This function must be used before taking a new action that should hold * the reference count. If this function returns false, then the action * must be discarded or it will prevent the flush operation from being * completed. */static bool acpi_ec_submit_flushable_request(struct acpi_ec *ec){ if (!acpi_ec_started(ec)) return false; acpi_ec_submit_request(ec); return true;}
static void acpi_ec_submit_event(struct acpi_ec *ec){ /* * It is safe to mask the events here, because acpi_ec_close_event() * will run at least once after this. */ acpi_ec_mask_events(ec); if (!acpi_ec_event_enabled(ec)) return;
if (ec->event_state != EC_EVENT_READY) return;
ec_dbg_evt("Command(%s) submitted/blocked", acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY));
ec->event_state = EC_EVENT_IN_PROGRESS; /* * If events_to_process is greater than 0 at this point, the while () * loop in acpi_ec_event_handler() is still running 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;
ec->events_in_progress++; queue_work(ec_wq, &ec->work);}
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_SLEEPstatic 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 void advance_transaction(struct acpi_ec *ec, bool interrupt){ struct transaction *t = ec->curr; bool wakeup = false; u8 status;
ec_dbg_stm("%s (%d)", interrupt ? "IRQ" : "TASK", smp_processor_id());
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) acpi_ec_submit_event(ec);
if (wakeup && interrupt) wake_up(&ec->wait);}
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;
if (t->rdata) memset(t->rdata, 0, t->rlen);
/* 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;
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_unlocked(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_unlocked(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_read_unlocked(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_unlocked(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);}
static int acpi_ec_write_unlocked(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_unlocked(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){ if (!first_ec) return -ENODEV;
return acpi_ec_write(first_ec, addr, val);}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;
if (!handle && !func) return -EINVAL;
handler = kzalloc_obj(*handler); 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) { /* * When remove_all is false, only remove custom query handlers * which have handler->func set. This is done to preserve query * handlers discovered thru ACPI, as they should continue handling * EC queries. */ if (remove_all || (handler->func && handler->query_bit == 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); flush_workqueue(ec_query_wq);}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_obj(struct acpi_ec_query); 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) { bool guard_timeout;
acpi_ec_complete_event(ec);
ec_dbg_evt("Event stopped");
spin_unlock_irq(&ec->lock);
guard_timeout = !!ec_guard(ec);
spin_lock_irq(&ec->lock);
/* Take care of SCI_EVT unless someone else is doing that. */ if (guard_timeout && !ec->curr) advance_transaction(ec, false); } else { acpi_ec_close_event(ec);
ec_dbg_evt("Event stopped"); }
ec->events_in_progress--;
spin_unlock_irq(&ec->lock);}
static void clear_gpe_and_advance_transaction(struct acpi_ec *ec, bool interrupt){ /* * 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);
advance_transaction(ec, true);}
static void acpi_ec_handle_interrupt(struct acpi_ec *ec){ unsigned long flags;
spin_lock_irqsave(&ec->lock, flags);
clear_gpe_and_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_statusacpi_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; u32 glk;
if ((address > 0xFF) || !value || !handler_context) return AE_BAD_PARAMETER;
if (function != ACPI_READ && function != ACPI_WRITE) return AE_BAD_PARAMETER;
mutex_lock(&ec->mutex);
if (ec->global_lock) { acpi_status status;
status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); if (ACPI_FAILURE(status)) { result = -ENODEV; goto unlock; } }
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_unlocked(ec, address, value) : acpi_ec_write_unlocked(ec, address, *value); if (result < 0) break; }
if (ec->busy_polling || bits > 8) acpi_ec_burst_disable(ec);
if (ec->global_lock) acpi_release_global_lock(glk);
unlock: mutex_unlock(&ec->mutex);
switch (result) { case -EINVAL: return AE_BAD_PARAMETER; case -ENODEV: return AE_NOT_FOUND; case -ETIME: return AE_TIME; case 0: return AE_OK; default: return AE_ERROR; }}
/* -------------------------------------------------------------------------- * Driver Interface * -------------------------------------------------------------------------- */
static acpi_statusec_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_obj(struct acpi_ec);
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_statusacpi_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_statusec_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;
/* 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_threaded_irq(ec->irq, NULL, acpi_ec_irq_handler, IRQF_SHARED | IRQF_ONESHOT, "ACPI EC", ec) >= 0;}
static int ec_prepare_gpio_irq(struct acpi_ec *ec, struct acpi_device *device){ int irq;
if (!device || ec->gpe >= 0 || ec->irq >= 0) return 0;
/* ACPI reduced hardware platforms use a GpioInt from _CRS. */ irq = acpi_dev_gpio_irq_get(device, 0); if (irq == -EPROBE_DEFER) return irq;
if (irq >= 0) ec->irq = irq;
return 0;}
/** * ec_install_handlers - Install service callbacks and register query methods. * @ec: Target EC. * @device: ACPI device object corresponding to @ec. * @call_reg: If _REG should be called to notify OpRegion availability * * 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", * or 0 (success) otherwise. */static int ec_install_handlers(struct acpi_ec *ec, struct acpi_device *device, bool call_reg){ acpi_status status;
acpi_ec_start(ec, false);
if (!test_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags)) { acpi_handle scope_handle = ec == first_ec ? ACPI_ROOT_OBJECT : ec->handle;
acpi_ec_enter_noirq(ec); status = acpi_install_address_space_handler_no_reg(scope_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 (call_reg && !test_bit(EC_FLAGS_EC_REG_CALLED, &ec->flags)) { acpi_execute_reg_methods(ec->handle, ACPI_UINT32_MAX, ACPI_ADR_SPACE_EC); set_bit(EC_FLAGS_EC_REG_CALLED, &ec->flags); }
if (!device) return 0;
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){ acpi_handle scope_handle = ec == first_ec ? ACPI_ROOT_OBJECT : ec->handle;
if (test_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags)) { if (ACPI_FAILURE(acpi_remove_address_space_handler( scope_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, bool call_reg){ int ret;
/* * GPIO IRQ lookup can defer. Do it before publishing the EC * OpRegion to AML to avoid a spurious _REG(disconnect). */ ret = ec_prepare_gpio_irq(ec, device); if (ret) return ret;
/* First EC capable of handling transactions */ if (!first_ec) first_ec = ec;
ret = ec_install_handlers(ec, device, call_reg); if (ret) { ec_remove_handlers(ec);
if (ec == first_ec) first_ec = NULL;
return ret; }
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_probe(struct platform_device *pdev){ struct acpi_device *device; struct acpi_ec *ec; int ret;
device = ACPI_COMPANION(&pdev->dev); if (!device) return -ENODEV;
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) { /* * 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, * except when the TRUST_DSDT_GPE quirk is set. */ boot_ec->handle = ec->handle;
if (EC_FLAGS_TRUST_DSDT_GPE) boot_ec->gpe = ec->gpe;
acpi_handle_debug(ec->handle, "duplicated.\n"); acpi_ec_free(ec); ec = boot_ec; } }
ret = acpi_ec_setup(ec, device, true); 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");
platform_set_drvdata(pdev, 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 void acpi_ec_remove(struct platform_device *pdev){ struct acpi_ec *ec = platform_get_drvdata(pdev);
release_region(ec->data_addr, 1); release_region(ec->command_addr, 1); if (ec != boot_ec) { ec_remove_handlers(ec); acpi_ec_free(ec); }}
void acpi_ec_register_opregions(struct acpi_device *adev){ if (first_ec && first_ec->handle != adev->handle) acpi_execute_reg_methods(adev->handle, 1, ACPI_ADR_SPACE_EC);}
static acpi_statusec_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, true); 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;}
static const struct dmi_system_id ec_dmi_table[] __initconst = { { /* * MSI MS-171F * https://bugzilla.kernel.org/show_bug.cgi?id=12461 */ .callback = ec_correct_ecdt, .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star"), DMI_MATCH(DMI_PRODUCT_NAME, "MS-171F"), }, }, { /* * HP Pavilion Gaming Laptop 15-cx0xxx * https://bugzilla.kernel.org/show_bug.cgi?id=209989 */ .callback = ec_honor_dsdt_gpe, .matches = { DMI_MATCH(DMI_SYS_VENDOR, "HP"), DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion Gaming Laptop 15-cx0xxx"), }, }, { /* * HP Pavilion Gaming Laptop 15-cx0041ur */ .callback = ec_honor_dsdt_gpe, .matches = { DMI_MATCH(DMI_SYS_VENDOR, "HP"), DMI_MATCH(DMI_PRODUCT_NAME, "HP 15-cx0041ur"), }, }, { /* * HP Pavilion Gaming Laptop 15-dk1xxx * https://github.com/systemd/systemd/issues/28942 */ .callback = ec_honor_dsdt_gpe, .matches = { DMI_MATCH(DMI_SYS_VENDOR, "HP"), DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion Gaming Laptop 15-dk1xxx"), }, }, { /* * HP 250 G7 Notebook PC */ .callback = ec_honor_dsdt_gpe, .matches = { DMI_MATCH(DMI_SYS_VENDOR, "HP"), DMI_MATCH(DMI_PRODUCT_NAME, "HP 250 G7 Notebook PC"), }, }, { /* * Samsung hardware * https://bugzilla.kernel.org/show_bug.cgi?id=44161 */ .callback = ec_clear_on_resume, .matches = { DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), }, }, {}};
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; }
if (!strlen(ecdt_ptr->id)) { /* * The ECDT table on some MSI notebooks contains invalid data, together * with an empty ID string (""). * * Section 5.2.15 of the ACPI specification requires the ID string to be * a "fully qualified reference to the (...) embedded controller device", * so this string always has to start with a backslash. * * However some ThinkBook machines have a ECDT table with a valid EC * description but an invalid ID string ("_SB.PC00.LPCB.EC0"). * * Because of this we only check if the ID string is empty in order to * avoid the obvious cases. */ pr_err(FW_BUG "Ignoring ECDT due to empty ID string\n"); 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, false); 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_SLEEPstatic int acpi_ec_suspend(struct device *dev){ struct acpi_ec *ec = dev_get_drvdata(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 = dev_get_drvdata(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 = dev_get_drvdata(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 = dev_get_drvdata(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);}
static bool acpi_ec_work_in_progress(struct acpi_ec *ec){ return ec->events_in_progress + ec->queries_in_progress > 0;}
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;
/* * Cancel the SCI wakeup and process all pending events in case there * are any wakeup ones in there. * * Note that if any non-EC GPEs are active at this point, the SCI will * retrigger after the rearming in acpi_s2idle_wake(), so no events * should be missed by canceling the wakeup here. */ pm_system_cancel_wakeup();
/* * 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)) { pm_pr_dbg("ACPI EC GPE status set\n");
clear_gpe_and_advance_transaction(first_ec, false); work_in_progress = acpi_ec_work_in_progress(first_ec); }
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 = acpi_ec_work_in_progress(first_ec);
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 platform_driver acpi_ec_driver = { .probe = acpi_ec_probe, .remove = acpi_ec_remove, .driver = { .name = "acpi-ec", .acpi_match_table = ec_device_ids, .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", WQ_PERCPU, 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[] = { { .matches = { DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), DMI_MATCH(DMI_PRODUCT_FAMILY, "Thinkpad X1 Carbon 6th"), }, }, { .matches = { DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), DMI_MATCH(DMI_PRODUCT_FAMILY, "ThinkPad X1 Yoga 3rd"), }, }, { .matches = { DMI_MATCH(DMI_SYS_VENDOR, "HP"), DMI_MATCH(DMI_PRODUCT_FAMILY, "103C_5336AN HP ZHAN 66 Pro"), }, }, /* * Lenovo Legion Go S; touchscreen blocks HW sleep when woken up from EC * https://gitlab.freedesktop.org/drm/amd/-/issues/3929 */ { .matches = { DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"), DMI_MATCH(DMI_PRODUCT_NAME, "83L3"), } }, { .matches = { DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"), DMI_MATCH(DMI_PRODUCT_NAME, "83N6"), } }, { .matches = { DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"), DMI_MATCH(DMI_PRODUCT_NAME, "83Q2"), } }, { .matches = { DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"), DMI_MATCH(DMI_PRODUCT_NAME, "83Q3"), } }, { // TUXEDO InfinityBook Pro AMD Gen9 .matches = { DMI_MATCH(DMI_BOARD_NAME, "GXxHRXx"), }, }, { },};
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(). */ platform_driver_register(&acpi_ec_driver);
acpi_ec_ecdt_start();}