cregit-Linux how code gets into the kernel

Release 4.11 drivers/acpi/acpica/evevent.c

/******************************************************************************
 *
 * Module Name: evevent - Fixed Event handling and dispatch
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2017, Intel Corp.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

#include <acpi/acpi.h>
#include "accommon.h"
#include "acevents.h"


#define _COMPONENT          ACPI_EVENTS
ACPI_MODULE_NAME("evevent")
#if (!ACPI_REDUCED_HARDWARE)	/* Entire module */
/* Local prototypes */
static acpi_status acpi_ev_fixed_event_initialize(void);

static u32 acpi_ev_fixed_event_dispatch(u32 event);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_initialize_events
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Initialize global data structures for ACPI events (Fixed, GPE)
 *
 ******************************************************************************/


acpi_status acpi_ev_initialize_events(void) { acpi_status status; ACPI_FUNCTION_TRACE(ev_initialize_events); /* If Hardware Reduced flag is set, there are no fixed events */ if (acpi_gbl_reduced_hardware) { return_ACPI_STATUS(AE_OK); } /* * Initialize the Fixed and General Purpose Events. This is done prior to * enabling SCIs to prevent interrupts from occurring before the handlers * are installed. */ status = acpi_ev_fixed_event_initialize(); if (ACPI_FAILURE(status)) { ACPI_EXCEPTION((AE_INFO, status, "Unable to initialize fixed events")); return_ACPI_STATUS(status); } status = acpi_ev_gpe_initialize(); if (ACPI_FAILURE(status)) { ACPI_EXCEPTION((AE_INFO, status, "Unable to initialize general purpose events")); return_ACPI_STATUS(status); } return_ACPI_STATUS(status); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)3840.86%111.11%
Robert Moore2223.66%444.44%
Linus Torvalds2021.51%111.11%
Andy Grover1111.83%111.11%
Len Brown22.15%222.22%
Total93100.00%9100.00%

/******************************************************************************* * * FUNCTION: acpi_ev_install_xrupt_handlers * * PARAMETERS: None * * RETURN: Status * * DESCRIPTION: Install interrupt handlers for the SCI and Global Lock * ******************************************************************************/
acpi_status acpi_ev_install_xrupt_handlers(void) { acpi_status status; ACPI_FUNCTION_TRACE(ev_install_xrupt_handlers); /* If Hardware Reduced flag is set, there is no ACPI h/w */ if (acpi_gbl_reduced_hardware) { return_ACPI_STATUS(AE_OK); } /* Install the SCI handler */ status = acpi_ev_install_sci_handler(); if (ACPI_FAILURE(status)) { ACPI_EXCEPTION((AE_INFO, status, "Unable to install System Control Interrupt handler")); return_ACPI_STATUS(status); } /* Install the handler for the Global Lock */ status = acpi_ev_init_global_lock_handler(); if (ACPI_FAILURE(status)) { ACPI_EXCEPTION((AE_INFO, status, "Unable to initialize Global Lock handler")); return_ACPI_STATUS(status); } acpi_gbl_events_initialized = TRUE; return_ACPI_STATUS(status); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)3636.73%111.11%
Robert Moore2121.43%333.33%
Linus Torvalds2020.41%111.11%
Andy Grover1919.39%222.22%
Len Brown22.04%222.22%
Total98100.00%9100.00%

/******************************************************************************* * * FUNCTION: acpi_ev_fixed_event_initialize * * PARAMETERS: None * * RETURN: Status * * DESCRIPTION: Install the fixed event handlers and disable all fixed events. * ******************************************************************************/
static acpi_status acpi_ev_fixed_event_initialize(void) { u32 i; acpi_status status; /* * Initialize the structure that keeps track of fixed event handlers and * enable the fixed events. */ for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) { acpi_gbl_fixed_event_handlers[i].handler = NULL; acpi_gbl_fixed_event_handlers[i].context = NULL; /* Disable the fixed event */ if (acpi_gbl_fixed_event_info[i].enable_register_id != 0xFF) { status = acpi_write_bit_register(acpi_gbl_fixed_event_info [i].enable_register_id, ACPI_DISABLE_EVENT); if (ACPI_FAILURE(status)) { return (status); } } } return (AE_OK); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)4850.53%218.18%
Andy Grover3941.05%218.18%
Robert Moore66.32%545.45%
Linus Torvalds22.11%218.18%
Total95100.00%11100.00%

/******************************************************************************* * * FUNCTION: acpi_ev_fixed_event_detect * * PARAMETERS: None * * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED * * DESCRIPTION: Checks the PM status register for active fixed events * ******************************************************************************/
u32 acpi_ev_fixed_event_detect(void) { u32 int_status = ACPI_INTERRUPT_NOT_HANDLED; u32 fixed_status; u32 fixed_enable; u32 i; ACPI_FUNCTION_NAME(ev_fixed_event_detect); /* * Read the fixed feature status and enable registers, as all the cases * depend on their values. Ignore errors here. */ (void)acpi_hw_register_read(ACPI_REGISTER_PM1_STATUS, &fixed_status); (void)acpi_hw_register_read(ACPI_REGISTER_PM1_ENABLE, &fixed_enable); ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS, "Fixed Event Block: Enable %08X Status %08X\n", fixed_enable, fixed_status)); /* * Check for all possible Fixed Events and dispatch those that are active */ for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) { /* Both the status and enable bits must be on for this event */ if ((fixed_status & acpi_gbl_fixed_event_info[i]. status_bit_mask) && (fixed_enable & acpi_gbl_fixed_event_info[i]. enable_bit_mask)) { /* * Found an active (signalled) event. Invoke global event * handler if present. */ acpi_fixed_event_count[i]++; if (acpi_gbl_global_event_handler) { acpi_gbl_global_event_handler (ACPI_EVENT_TYPE_FIXED, NULL, i, acpi_gbl_global_event_handler_context); } int_status |= acpi_ev_fixed_event_dispatch(i); } } return (int_status); }

Contributors

PersonTokensPropCommitsCommitProp
Andy Grover5337.59%428.57%
Linus Torvalds (pre-git)5035.46%321.43%
Lin Ming2014.18%17.14%
Linus Torvalds107.09%17.14%
Len Brown53.55%214.29%
Robert Moore32.13%321.43%
Total141100.00%14100.00%

/******************************************************************************* * * FUNCTION: acpi_ev_fixed_event_dispatch * * PARAMETERS: event - Event type * * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED * * DESCRIPTION: Clears the status bit for the requested event, calls the * handler that previously registered for the event. * NOTE: If there is no handler for the event, the event is * disabled to prevent further interrupts. * ******************************************************************************/
static u32 acpi_ev_fixed_event_dispatch(u32 event) { ACPI_FUNCTION_ENTRY(); /* Clear the status bit */ (void)acpi_write_bit_register(acpi_gbl_fixed_event_info[event]. status_register_id, ACPI_CLEAR_STATUS); /* * Make sure that a handler exists. If not, report an error * and disable the event to prevent further interrupts. */ if (!acpi_gbl_fixed_event_handlers[event].handler) { (void)acpi_write_bit_register(acpi_gbl_fixed_event_info[event]. enable_register_id, ACPI_DISABLE_EVENT); ACPI_ERROR((AE_INFO, "No installed handler for fixed event - %s (%u), disabling", acpi_ut_get_event_name(event), event)); return (ACPI_INTERRUPT_NOT_HANDLED); } /* Invoke the Fixed Event handler */ return ((acpi_gbl_fixed_event_handlers[event]. handler) (acpi_gbl_fixed_event_handlers[event].context)); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)5960.20%327.27%
Andy Grover2121.43%218.18%
Robert Moore1616.33%545.45%
Linus Torvalds22.04%19.09%
Total98100.00%11100.00%

#endif /* !ACPI_REDUCED_HARDWARE */

Overall Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)24141.91%310.00%
Andy Grover14525.22%620.00%
Robert Moore10017.39%1240.00%
Linus Torvalds559.57%26.67%
Lin Ming203.48%13.33%
Len Brown122.09%413.33%
Colin Ian King10.17%13.33%
Patrick Mochel10.17%13.33%
Total575100.00%30100.00%
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