1 /*******************************************************************************
3 * Module Name: evsci - System Control Interrupt configuration and
4 * legacy to ACPI mode state transition functions
6 ******************************************************************************/
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45 #include <acpi/acpi.h>
49 #define _COMPONENT ACPI_EVENTS
50 ACPI_MODULE_NAME("evsci")
52 /* Local prototypes */
53 static u32 ACPI_SYSTEM_XFACE acpi_ev_sci_xrupt_handler(void *context);
55 /*******************************************************************************
57 * FUNCTION: acpi_ev_sci_xrupt_handler
59 * PARAMETERS: Context - Calling Context
61 * RETURN: Status code indicates whether interrupt was handled.
63 * DESCRIPTION: Interrupt handler that will figure out what function or
64 * control method to call to deal with a SCI.
66 ******************************************************************************/
68 static u32 ACPI_SYSTEM_XFACE acpi_ev_sci_xrupt_handler(void *context)
70 struct acpi_gpe_xrupt_info *gpe_xrupt_list = context;
71 u32 interrupt_handled = ACPI_INTERRUPT_NOT_HANDLED;
73 ACPI_FUNCTION_TRACE(ev_sci_xrupt_handler);
76 * We are guaranteed by the ACPI CA initialization/shutdown code that
77 * if this interrupt handler is installed, ACPI is enabled.
82 * Check for and dispatch any Fixed Events that have occurred
84 interrupt_handled |= acpi_ev_fixed_event_detect();
87 * General Purpose Events:
88 * Check for and dispatch any GPEs that have occurred
90 interrupt_handled |= acpi_ev_gpe_detect(gpe_xrupt_list);
92 return_UINT32(interrupt_handled);
95 /*******************************************************************************
97 * FUNCTION: acpi_ev_gpe_xrupt_handler
99 * PARAMETERS: Context - Calling Context
101 * RETURN: Status code indicates whether interrupt was handled.
103 * DESCRIPTION: Handler for GPE Block Device interrupts
105 ******************************************************************************/
107 u32 ACPI_SYSTEM_XFACE acpi_ev_gpe_xrupt_handler(void *context)
109 struct acpi_gpe_xrupt_info *gpe_xrupt_list = context;
110 u32 interrupt_handled = ACPI_INTERRUPT_NOT_HANDLED;
112 ACPI_FUNCTION_TRACE(ev_gpe_xrupt_handler);
115 * We are guaranteed by the ACPI CA initialization/shutdown code that
116 * if this interrupt handler is installed, ACPI is enabled.
119 /* GPEs: Check for and dispatch any GPEs that have occurred */
121 interrupt_handled |= acpi_ev_gpe_detect(gpe_xrupt_list);
123 return_UINT32(interrupt_handled);
126 /******************************************************************************
128 * FUNCTION: acpi_ev_install_sci_handler
134 * DESCRIPTION: Installs SCI handler.
136 ******************************************************************************/
138 u32 acpi_ev_install_sci_handler(void)
142 ACPI_FUNCTION_TRACE(ev_install_sci_handler);
145 acpi_os_install_interrupt_handler((u32) acpi_gbl_FADT.sci_interrupt,
146 acpi_ev_sci_xrupt_handler,
147 acpi_gbl_gpe_xrupt_list_head);
148 return_ACPI_STATUS(status);
151 /******************************************************************************
153 * FUNCTION: acpi_ev_remove_sci_handler
157 * RETURN: E_OK if handler uninstalled OK, E_ERROR if handler was not
158 * installed to begin with
160 * DESCRIPTION: Remove the SCI interrupt handler. No further SCIs will be
163 * Note: It doesn't seem important to disable all events or set the event
164 * enable registers to their original values. The OS should disable
165 * the SCI interrupt level when the handler is removed, so no more
166 * events will come in.
168 ******************************************************************************/
170 acpi_status acpi_ev_remove_sci_handler(void)
174 ACPI_FUNCTION_TRACE(ev_remove_sci_handler);
176 /* Just let the OS remove the handler and disable the level */
179 acpi_os_remove_interrupt_handler((u32) acpi_gbl_FADT.sci_interrupt,
180 acpi_ev_sci_xrupt_handler);
182 return_ACPI_STATUS(status);