--- /dev/null
+/*
+ * 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>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+/* 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/spinlock.h>
+#include <linux/slab.h>
+#include <linux/acpi.h>
+#include <linux/dmi.h>
+#include <asm/io.h>
+
+#include "internal.h"
+
+#define ACPI_EC_CLASS "embedded_controller"
+#define ACPI_EC_DEVICE_NAME "Embedded Controller"
+#define ACPI_EC_FILE_INFO "info"
+
+/* 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 */
+
+/* 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_MSI_UDELAY 550 /* Wait 550us for MSI EC */
+#define ACPI_EC_UDELAY_POLL 1000 /* Wait 1ms for EC transaction polling */
+#define ACPI_EC_CLEAR_MAX 100 /* Maximum number of events to query
+ * when trying to clear the EC */
+
+enum {
+ EC_FLAGS_QUERY_PENDING, /* Query is pending */
+ EC_FLAGS_HANDLERS_INSTALLED, /* Handlers for GPE and
+ * OpReg are installed */
+ EC_FLAGS_STARTED, /* Driver is started */
+ EC_FLAGS_STOPPED, /* Driver is stopped */
+ EC_FLAGS_COMMAND_STORM, /* GPE storms occurred to the
+ * current command processing */
+};
+
+#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");
+
+/*
+ * 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");
+
+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;
+ unsigned long timestamp;
+};
+
+static int acpi_ec_query(struct acpi_ec *ec, u8 *data);
+static void advance_transaction(struct acpi_ec *ec);
+
+struct acpi_ec *boot_ec, *first_ec;
+EXPORT_SYMBOL(first_ec);
+
+static int EC_FLAGS_MSI; /* Out-of-spec MSI controller */
+static int EC_FLAGS_VALIDATE_ECDT; /* ASUStec ECDTs need to be validated */
+static int EC_FLAGS_SKIP_DSDT_SCAN; /* Not all BIOS survive early DSDT scan */
+static int EC_FLAGS_CLEAR_ON_RESUME; /* Needs acpi_ec_clear() on boot/resume */
+static int EC_FLAGS_QUERY_HANDSHAKE; /* Needs QR_EC issued when SCI_EVT set */
+
+/* --------------------------------------------------------------------------
+ * 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_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->curr->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->curr->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->curr->timestamp = jiffies;
+}
+
+#ifdef 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_is_gpe_raised(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_SET) ? true : false;
+}
+
+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_is_gpe_raised(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);
+ }
+}
+
+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);
+ }
+}
+
+static inline void acpi_ec_clear_gpe(struct acpi_ec *ec)
+{
+ /*
+ * GPE STS is a W1C register, which means:
+ * 1. Software can clear it without worrying about clearing 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.
+ * So software can clear GPE in any contexts.
+ * Warning: do not move the check into advance_transaction() as the
+ * EC commands will be sent without GPE raised.
+ */
+ if (!acpi_ec_is_gpe_raised(ec))
+ return;
+ acpi_clear_gpe(NULL, ec->gpe);
+}
+
+/* --------------------------------------------------------------------------
+ * Transaction Management
+ * -------------------------------------------------------------------------- */
+
+static void acpi_ec_submit_request(struct acpi_ec *ec)
+{
+ ec->reference_count++;
+ if (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 (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_set_storm(struct acpi_ec *ec, u8 flag)
+{
+ if (!test_bit(flag, &ec->flags)) {
+ acpi_ec_disable_gpe(ec, false);
+ ec_dbg_drv("Polling enabled");
+ set_bit(flag, &ec->flags);
+ }
+}
+
+static void acpi_ec_clear_storm(struct acpi_ec *ec, u8 flag)
+{
+ if (test_bit(flag, &ec->flags)) {
+ clear_bit(flag, &ec->flags);
+ acpi_ec_enable_gpe(ec, false);
+ 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_query(struct acpi_ec *ec)
+{
+ if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) {
+ ec_dbg_req("Event started");
+ schedule_work(&ec->work);
+ }
+}
+
+static void acpi_ec_complete_query(struct acpi_ec *ec)
+{
+ if (ec->curr->command == ACPI_EC_COMMAND_QUERY) {
+ clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
+ ec_dbg_req("Event stopped");
+ }
+}
+
+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 void advance_transaction(struct acpi_ec *ec)
+{
+ struct transaction *t;
+ u8 status;
+ bool wakeup = false;
+
+ ec_dbg_stm("%s (%d)", in_interrupt() ? "IRQ" : "TASK",
+ smp_processor_id());
+ /*
+ * By always clearing STS before handling all indications, we can
+ * ensure a hardware STS 0->1 change after this clearing can always
+ * trigger a GPE interrupt.
+ */
+ acpi_ec_clear_gpe(ec);
+ status = acpi_ec_read_status(ec);
+ t = ec->curr;
+ if (!t)
+ goto err;
+ if (t->flags & ACPI_EC_COMMAND_POLL) {
+ if (t->wlen > t->wi) {
+ if ((status & ACPI_EC_FLAG_IBF) == 0)
+ acpi_ec_write_data(ec, t->wdata[t->wi++]);
+ else
+ goto err;
+ } else if (t->rlen > t->ri) {
+ if ((status & ACPI_EC_FLAG_OBF) == 1) {
+ t->rdata[t->ri++] = acpi_ec_read_data(ec);
+ if (t->rlen == t->ri) {
+ t->flags |= ACPI_EC_COMMAND_COMPLETE;
+ if (t->command == ACPI_EC_COMMAND_QUERY)
+ ec_dbg_req("Command(%s) hardware completion",
+ acpi_ec_cmd_string(t->command));
+ wakeup = true;
+ }
+ } else
+ goto err;
+ } else if (t->wlen == t->wi &&
+ (status & ACPI_EC_FLAG_IBF) == 0) {
+ t->flags |= ACPI_EC_COMMAND_COMPLETE;
+ wakeup = true;
+ }
+ goto out;
+ } else {
+ if (EC_FLAGS_QUERY_HANDSHAKE &&
+ !(status & ACPI_EC_FLAG_SCI) &&
+ (t->command == ACPI_EC_COMMAND_QUERY)) {
+ t->flags |= ACPI_EC_COMMAND_POLL;
+ acpi_ec_complete_query(ec);
+ t->rdata[t->ri++] = 0x00;
+ t->flags |= ACPI_EC_COMMAND_COMPLETE;
+ ec_dbg_req("Command(%s) software completion",
+ acpi_ec_cmd_string(t->command));
+ wakeup = true;
+ } else if ((status & ACPI_EC_FLAG_IBF) == 0) {
+ acpi_ec_write_cmd(ec, t->command);
+ t->flags |= ACPI_EC_COMMAND_POLL;
+ acpi_ec_complete_query(ec);
+ } else
+ goto err;
+ goto out;
+ }
+err:
+ /*
+ * If SCI bit is set, then don't think it's a false IRQ
+ * otherwise will take a not handled IRQ as a false one.
+ */
+ if (!(status & ACPI_EC_FLAG_SCI)) {
+ if (in_interrupt() && t) {
+ if (t->irq_count < ec_storm_threshold)
+ ++t->irq_count;
+ /* Allow triggering on 0 threshold */
+ if (t->irq_count == ec_storm_threshold)
+ acpi_ec_set_storm(ec, EC_FLAGS_COMMAND_STORM);
+ }
+ }
+out:
+ if (status & ACPI_EC_FLAG_SCI)
+ acpi_ec_submit_query(ec);
+ if (wakeup && in_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;
+ ec->curr->timestamp = jiffies;
+ advance_transaction(ec);
+}
+
+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);
+ unsigned long usecs = ACPI_EC_UDELAY_POLL;
+ do {
+ /* don't sleep with disabled interrupts */
+ if (EC_FLAGS_MSI || irqs_disabled()) {
+ usecs = ACPI_EC_MSI_UDELAY;
+ udelay(usecs);
+ if (ec_transaction_completed(ec))
+ return 0;
+ } else {
+ if (wait_event_timeout(ec->wait,
+ ec_transaction_completed(ec),
+ usecs_to_jiffies(usecs)))
+ return 0;
+ }
+ spin_lock_irqsave(&ec->lock, flags);
+ if (time_after(jiffies,
+ ec->curr->timestamp +
+ usecs_to_jiffies(usecs)))
+ advance_transaction(ec);
+ 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 (EC_FLAGS_MSI)
+ udelay(ACPI_EC_MSI_UDELAY);
+ /* 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_clear_storm(ec, EC_FLAGS_COMMAND_STORM);
+ 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 (test_bit(EC_FLAGS_COMMAND_STORM, &ec->flags))
+ msleep(1);
+ 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);
+
+/*
+ * 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, status;
+ u8 value = 0;
+
+ for (i = 0; i < ACPI_EC_CLEAR_MAX; i++) {
+ status = acpi_ec_query(ec, &value);
+ if (status || !value)
+ 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_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");
+ }
+ 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);
+}
+
+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)
+{
+ struct acpi_ec *ec = first_ec;
+
+ if (!ec)
+ return;
+
+ /* Allow transactions to be carried out again */
+ acpi_ec_start(ec, true);
+
+ if (EC_FLAGS_CLEAR_ON_RESUME)
+ acpi_ec_clear(ec);
+}
+
+void acpi_ec_unblock_transactions_early(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(struct acpi_ec_query_handler *handler)
+{
+ if (handler)
+ kref_get(&handler->kref);
+ return handler;
+}
+
+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);
+
+void acpi_ec_remove_query_handler(struct acpi_ec *ec, 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 (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);
+}
+EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler);
+
+static void acpi_ec_run(void *cxt)
+{
+ struct acpi_ec_query_handler *handler = cxt;
+
+ if (!handler)
+ return;
+ 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);
+ acpi_ec_put_query_handler(handler);
+}
+
+static int acpi_ec_query(struct acpi_ec *ec, u8 *data)
+{
+ u8 value = 0;
+ int result;
+ acpi_status status;
+ struct acpi_ec_query_handler *handler;
+ struct transaction t = {.command = ACPI_EC_COMMAND_QUERY,
+ .wdata = NULL, .rdata = &value,
+ .wlen = 0, .rlen = 1};
+
+ /*
+ * 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, &t);
+ if (result)
+ return result;
+ if (data)
+ *data = value;
+ if (!value)
+ return -ENODATA;
+
+ mutex_lock(&ec->mutex);
+ list_for_each_entry(handler, &ec->list, node) {
+ if (value == handler->query_bit) {
+ /* have custom handler for this bit */
+ handler = acpi_ec_get_query_handler(handler);
+ ec_dbg_evt("Query(0x%02x) scheduled",
+ handler->query_bit);
+ status = acpi_os_execute((handler->func) ?
+ OSL_NOTIFY_HANDLER : OSL_GPE_HANDLER,
+ acpi_ec_run, handler);
+ if (ACPI_FAILURE(status))
+ result = -EBUSY;
+ break;
+ }
+ }
+ mutex_unlock(&ec->mutex);
+ return result;
+}
+
+static void acpi_ec_gpe_poller(struct work_struct *work)
+{
+ struct acpi_ec *ec = container_of(work, struct acpi_ec, work);
+
+ acpi_ec_query(ec, NULL);
+}
+
+static u32 acpi_ec_gpe_handler(acpi_handle gpe_device,
+ u32 gpe_number, void *data)
+{
+ unsigned long flags;
+ struct acpi_ec *ec = data;
+
+ spin_lock_irqsave(&ec->lock, flags);
+ advance_transaction(ec);
+ spin_unlock_irqrestore(&ec->lock, flags);
+ return ACPI_INTERRUPT_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_FLAGS_MSI || 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_FLAGS_MSI || 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 struct acpi_ec *make_acpi_ec(void)
+{
+ struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL);
+
+ if (!ec)
+ return NULL;
+ ec->flags = 1 << EC_FLAGS_QUERY_PENDING;
+ mutex_init(&ec->mutex);
+ init_waitqueue_head(&ec->wait);
+ INIT_LIST_HEAD(&ec->list);
+ spin_lock_init(&ec->lock);
+ INIT_WORK(&ec->work, acpi_ec_gpe_poller);
+ 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;
+
+ /* Get GPE bit assignment (EC events). */
+ /* TODO: Add support for _GPE returning a package */
+ status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp);
+ if (ACPI_FAILURE(status))
+ return status;
+ ec->gpe = tmp;
+ /* 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 int ec_install_handlers(struct acpi_ec *ec)
+{
+ acpi_status status;
+
+ if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags))
+ return 0;
+ status = acpi_install_gpe_raw_handler(NULL, ec->gpe,
+ ACPI_GPE_EDGE_TRIGGERED,
+ &acpi_ec_gpe_handler, ec);
+ if (ACPI_FAILURE(status))
+ return -ENODEV;
+
+ acpi_ec_start(ec, false);
+ status = acpi_install_address_space_handler(ec->handle,
+ ACPI_ADR_SPACE_EC,
+ &acpi_ec_space_handler,
+ NULL, ec);
+ if (ACPI_FAILURE(status)) {
+ if (status == AE_NOT_FOUND) {
+ /*
+ * Maybe OS fails in evaluating the _REG object.
+ * The AE_NOT_FOUND error will be ignored and OS
+ * continue to initialize EC.
+ */
+ pr_err("Fail in evaluating the _REG object"
+ " of EC device. Broken bios is suspected.\n");
+ } else {
+ acpi_ec_stop(ec, false);
+ acpi_remove_gpe_handler(NULL, ec->gpe,
+ &acpi_ec_gpe_handler);
+ return -ENODEV;
+ }
+ }
+
+ set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags);
+ return 0;
+}
+
+static void ec_remove_handlers(struct acpi_ec *ec)
+{
+ if (!test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags))
+ return;
+ acpi_ec_stop(ec, false);
+ 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");
+ if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe,
+ &acpi_ec_gpe_handler)))
+ pr_err("failed to remove gpe handler\n");
+ clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags);
+}
+
+static int acpi_ec_add(struct acpi_device *device)
+{
+ struct acpi_ec *ec = NULL;
+ int ret;
+
+ strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
+ strcpy(acpi_device_class(device), ACPI_EC_CLASS);
+
+ /* Check for boot EC */
+ if (boot_ec &&
+ (boot_ec->handle == device->handle ||
+ boot_ec->handle == ACPI_ROOT_OBJECT)) {
+ ec = boot_ec;
+ boot_ec = NULL;
+ } else {
+ ec = make_acpi_ec();
+ if (!ec)
+ return -ENOMEM;
+ }
+ if (ec_parse_device(device->handle, 0, ec, NULL) !=
+ AE_CTRL_TERMINATE) {
+ kfree(ec);
+ return -EINVAL;
+ }
+
+ /* Find and register all query methods */
+ acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1,
+ acpi_ec_register_query_methods, NULL, ec, NULL);
+
+ if (!first_ec)
+ first_ec = ec;
+ 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);
+
+ pr_info("GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n",
+ ec->gpe, ec->command_addr, ec->data_addr);
+
+ ret = ec_install_handlers(ec);
+
+ /* Reprobe devices depending on the EC */
+ acpi_walk_dep_device_list(ec->handle);
+
+ /* EC is fully operational, allow queries */
+ clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
+
+ /* Clear stale _Q events if hardware might require that */
+ if (EC_FLAGS_CLEAR_ON_RESUME)
+ acpi_ec_clear(ec);
+ return ret;
+}
+
+static int acpi_ec_remove(struct acpi_device *device)
+{
+ struct acpi_ec *ec;
+ struct acpi_ec_query_handler *handler, *tmp;
+
+ if (!device)
+ return -EINVAL;
+
+ ec = acpi_driver_data(device);
+ ec_remove_handlers(ec);
+ mutex_lock(&ec->mutex);
+ list_for_each_entry_safe(handler, tmp, &ec->list, node) {
+ list_del(&handler->node);
+ kfree(handler);
+ }
+ mutex_unlock(&ec->mutex);
+ release_region(ec->data_addr, 1);
+ release_region(ec->command_addr, 1);
+ device->driver_data = NULL;
+ if (ec == first_ec)
+ first_ec = NULL;
+ kfree(ec);
+ return 0;
+}
+
+static acpi_status
+ec_parse_io_ports(struct acpi_resource *resource, void *context)
+{
+ struct acpi_ec *ec = context;
+
+ if (resource->type != ACPI_RESOURCE_TYPE_IO)
+ return AE_OK;
+
+ /*
+ * The first address region returned is the data port, and
+ * the second address region returned is the status/command
+ * port.
+ */
+ if (ec->data_addr == 0)
+ ec->data_addr = resource->data.io.minimum;
+ else if (ec->command_addr == 0)
+ ec->command_addr = resource->data.io.minimum;
+ else
+ return AE_CTRL_TERMINATE;
+
+ return AE_OK;
+}
+
+int __init acpi_boot_ec_enable(void)
+{
+ if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags))
+ return 0;
+ if (!ec_install_handlers(boot_ec)) {
+ first_ec = boot_ec;
+ return 0;
+ }
+ return -EFAULT;
+}
+
+static const struct acpi_device_id ec_device_ids[] = {
+ {"PNP0C09", 0},
+ {"", 0},
+};
+
+/* Some BIOS do not survive early DSDT scan, skip it */
+static int ec_skip_dsdt_scan(const struct dmi_system_id *id)
+{
+ EC_FLAGS_SKIP_DSDT_SCAN = 1;
+ return 0;
+}
+
+/* ASUStek often supplies us with broken ECDT, validate it */
+static int ec_validate_ecdt(const struct dmi_system_id *id)
+{
+ EC_FLAGS_VALIDATE_ECDT = 1;
+ return 0;
+}
+
+/* MSI EC needs special treatment, enable it */
+static int ec_flag_msi(const struct dmi_system_id *id)
+{
+ pr_debug("Detected MSI hardware, enabling workarounds.\n");
+ EC_FLAGS_MSI = 1;
+ EC_FLAGS_VALIDATE_ECDT = 1;
+ return 0;
+}
+
+/*
+ * Clevo M720 notebook actually works ok with IRQ mode, if we lifted
+ * the GPE storm threshold back to 20
+ */
+static int ec_enlarge_storm_threshold(const struct dmi_system_id *id)
+{
+ pr_debug("Setting the EC GPE storm threshold to 20\n");
+ ec_storm_threshold = 20;
+ return 0;
+}
+
+/*
+ * Acer EC firmware refuses to respond QR_EC when SCI_EVT is not set, for
+ * which case, we complete the QR_EC without issuing it to the firmware.
+ * https://bugzilla.kernel.org/show_bug.cgi?id=86211
+ */
+static int ec_flag_query_handshake(const struct dmi_system_id *id)
+{
+ pr_debug("Detected the EC firmware requiring QR_EC issued when SCI_EVT set\n");
+ EC_FLAGS_QUERY_HANDSHAKE = 1;
+ return 0;
+}
+
+/*
+ * 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;
+ return 0;
+}
+
+static struct dmi_system_id ec_dmi_table[] __initdata = {
+ {
+ ec_skip_dsdt_scan, "Compal JFL92", {
+ DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),
+ DMI_MATCH(DMI_BOARD_NAME, "JFL92") }, NULL},
+ {
+ ec_flag_msi, "MSI hardware", {
+ DMI_MATCH(DMI_BIOS_VENDOR, "Micro-Star")}, NULL},
+ {
+ ec_flag_msi, "MSI hardware", {
+ DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star")}, NULL},
+ {
+ ec_flag_msi, "MSI hardware", {
+ DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-Star")}, NULL},
+ {
+ ec_flag_msi, "MSI hardware", {
+ DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-STAR")}, NULL},
+ {
+ ec_flag_msi, "Quanta hardware", {
+ DMI_MATCH(DMI_SYS_VENDOR, "Quanta"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "TW8/SW8/DW8"),}, NULL},
+ {
+ ec_flag_msi, "Quanta hardware", {
+ DMI_MATCH(DMI_SYS_VENDOR, "Quanta"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "TW9/SW9"),}, NULL},
+ {
+ ec_flag_msi, "Clevo W350etq", {
+ DMI_MATCH(DMI_SYS_VENDOR, "CLEVO CO."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "W35_37ET"),}, NULL},
+ {
+ ec_validate_ecdt, "ASUS hardware", {
+ DMI_MATCH(DMI_BIOS_VENDOR, "ASUS") }, NULL},
+ {
+ ec_validate_ecdt, "ASUS hardware", {
+ DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc.") }, NULL},
+ {
+ ec_enlarge_storm_threshold, "CLEVO hardware", {
+ DMI_MATCH(DMI_SYS_VENDOR, "CLEVO Co."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "M720T/M730T"),}, NULL},
+ {
+ ec_skip_dsdt_scan, "HP Folio 13", {
+ DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13"),}, NULL},
+ {
+ ec_validate_ecdt, "ASUS hardware", {
+ DMI_MATCH(DMI_SYS_VENDOR, "ASUSTek Computer Inc."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "L4R"),}, NULL},
+ {
+ ec_clear_on_resume, "Samsung hardware", {
+ DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD.")}, NULL},
+ {
+ ec_flag_query_handshake, "Acer hardware", {
+ DMI_MATCH(DMI_SYS_VENDOR, "Acer"), }, NULL},
+ {},
+};
+
+int __init acpi_ec_ecdt_probe(void)
+{
+ acpi_status status;
+ struct acpi_ec *saved_ec = NULL;
+ struct acpi_table_ecdt *ecdt_ptr;
+
+ boot_ec = make_acpi_ec();
+ if (!boot_ec)
+ return -ENOMEM;
+ /*
+ * 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_SUCCESS(status)) {
+ pr_info("EC description table is found, configuring boot EC\n");
+ boot_ec->command_addr = ecdt_ptr->control.address;
+ boot_ec->data_addr = ecdt_ptr->data.address;
+ boot_ec->gpe = ecdt_ptr->gpe;
+ boot_ec->handle = ACPI_ROOT_OBJECT;
+ acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id,
+ &boot_ec->handle);
+ /* Don't trust ECDT, which comes from ASUSTek */
+ if (!EC_FLAGS_VALIDATE_ECDT)
+ goto install;
+ saved_ec = kmemdup(boot_ec, sizeof(struct acpi_ec), GFP_KERNEL);
+ if (!saved_ec)
+ return -ENOMEM;
+ /* fall through */
+ }
+
+ if (EC_FLAGS_SKIP_DSDT_SCAN) {
+ kfree(saved_ec);
+ return -ENODEV;
+ }
+
+ /* This workaround is needed only on some broken machines,
+ * which require early EC, but fail to provide ECDT */
+ pr_debug("Look up EC in DSDT\n");
+ status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device,
+ boot_ec, NULL);
+ /* Check that acpi_get_devices actually find something */
+ if (ACPI_FAILURE(status) || !boot_ec->handle)
+ goto error;
+ if (saved_ec) {
+ /* try to find good ECDT from ASUSTek */
+ if (saved_ec->command_addr != boot_ec->command_addr ||
+ saved_ec->data_addr != boot_ec->data_addr ||
+ saved_ec->gpe != boot_ec->gpe ||
+ saved_ec->handle != boot_ec->handle)
+ pr_info("ASUSTek keeps feeding us with broken "
+ "ECDT tables, which are very hard to workaround. "
+ "Trying to use DSDT EC info instead. Please send "
+ "output of acpidump to linux-acpi@vger.kernel.org\n");
+ kfree(saved_ec);
+ saved_ec = NULL;
+ } else {
+ /* We really need to limit this workaround, the only ASUS,
+ * which needs it, has fake EC._INI method, so use it as flag.
+ * Keep boot_ec struct as it will be needed soon.
+ */
+ if (!dmi_name_in_vendors("ASUS") ||
+ !acpi_has_method(boot_ec->handle, "_INI"))
+ return -ENODEV;
+ }
+install:
+ if (!ec_install_handlers(boot_ec)) {
+ first_ec = boot_ec;
+ return 0;
+ }
+error:
+ kfree(boot_ec);
+ kfree(saved_ec);
+ boot_ec = NULL;
+ return -ENODEV;
+}
+
+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,
+ },
+};
+
+int __init acpi_ec_init(void)
+{
+ int result = 0;
+
+ /* Now register the driver for the EC */
+ result = acpi_bus_register_driver(&acpi_ec_driver);
+ if (result < 0)
+ return -ENODEV;
+
+ return result;
+}
+
+/* EC driver currently not unloadable */
+#if 0
+static void __exit acpi_ec_exit(void)
+{
+
+ acpi_bus_unregister_driver(&acpi_ec_driver);
+}
+#endif /* 0 */
Code Review / kvmfornfv.git / blobdiff