mirror of https://gitee.com/openkylin/linux.git
234 lines
5.3 KiB
C
234 lines
5.3 KiB
C
/*
|
|
* Support for OLPC XO-1.5 System Control Interrupts (SCI)
|
|
*
|
|
* Copyright (C) 2009-2010 One Laptop per Child
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/workqueue.h>
|
|
#include <linux/power_supply.h>
|
|
#include <linux/olpc-ec.h>
|
|
|
|
#include <linux/acpi.h>
|
|
#include <asm/olpc.h>
|
|
|
|
#define DRV_NAME "olpc-xo15-sci"
|
|
#define PFX DRV_NAME ": "
|
|
#define XO15_SCI_CLASS DRV_NAME
|
|
#define XO15_SCI_DEVICE_NAME "OLPC XO-1.5 SCI"
|
|
|
|
static unsigned long xo15_sci_gpe;
|
|
static bool lid_wake_on_close;
|
|
|
|
/*
|
|
* The normal ACPI LID wakeup behavior is wake-on-open, but not
|
|
* wake-on-close. This is implemented as standard by the XO-1.5 DSDT.
|
|
*
|
|
* We provide here a sysfs attribute that will additionally enable
|
|
* wake-on-close behavior. This is useful (e.g.) when we oportunistically
|
|
* suspend with the display running; if the lid is then closed, we want to
|
|
* wake up to turn the display off.
|
|
*
|
|
* This is controlled through a custom method in the XO-1.5 DSDT.
|
|
*/
|
|
static int set_lid_wake_behavior(bool wake_on_close)
|
|
{
|
|
acpi_status status;
|
|
|
|
status = acpi_execute_simple_method(NULL, "\\_SB.PCI0.LID.LIDW", wake_on_close);
|
|
if (ACPI_FAILURE(status)) {
|
|
pr_warning(PFX "failed to set lid behavior\n");
|
|
return 1;
|
|
}
|
|
|
|
lid_wake_on_close = wake_on_close;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t
|
|
lid_wake_on_close_show(struct kobject *s, struct kobj_attribute *attr, char *buf)
|
|
{
|
|
return sprintf(buf, "%u\n", lid_wake_on_close);
|
|
}
|
|
|
|
static ssize_t lid_wake_on_close_store(struct kobject *s,
|
|
struct kobj_attribute *attr,
|
|
const char *buf, size_t n)
|
|
{
|
|
unsigned int val;
|
|
|
|
if (sscanf(buf, "%u", &val) != 1)
|
|
return -EINVAL;
|
|
|
|
set_lid_wake_behavior(!!val);
|
|
|
|
return n;
|
|
}
|
|
|
|
static struct kobj_attribute lid_wake_on_close_attr =
|
|
__ATTR(lid_wake_on_close, 0644,
|
|
lid_wake_on_close_show,
|
|
lid_wake_on_close_store);
|
|
|
|
static void battery_status_changed(void)
|
|
{
|
|
struct power_supply *psy = power_supply_get_by_name("olpc-battery");
|
|
|
|
if (psy) {
|
|
power_supply_changed(psy);
|
|
put_device(psy->dev);
|
|
}
|
|
}
|
|
|
|
static void ac_status_changed(void)
|
|
{
|
|
struct power_supply *psy = power_supply_get_by_name("olpc-ac");
|
|
|
|
if (psy) {
|
|
power_supply_changed(psy);
|
|
put_device(psy->dev);
|
|
}
|
|
}
|
|
|
|
static void process_sci_queue(void)
|
|
{
|
|
u16 data;
|
|
int r;
|
|
|
|
do {
|
|
r = olpc_ec_sci_query(&data);
|
|
if (r || !data)
|
|
break;
|
|
|
|
pr_debug(PFX "SCI 0x%x received\n", data);
|
|
|
|
switch (data) {
|
|
case EC_SCI_SRC_BATERR:
|
|
case EC_SCI_SRC_BATSOC:
|
|
case EC_SCI_SRC_BATTERY:
|
|
case EC_SCI_SRC_BATCRIT:
|
|
battery_status_changed();
|
|
break;
|
|
case EC_SCI_SRC_ACPWR:
|
|
ac_status_changed();
|
|
break;
|
|
}
|
|
} while (data);
|
|
|
|
if (r)
|
|
pr_err(PFX "Failed to clear SCI queue");
|
|
}
|
|
|
|
static void process_sci_queue_work(struct work_struct *work)
|
|
{
|
|
process_sci_queue();
|
|
}
|
|
|
|
static DECLARE_WORK(sci_work, process_sci_queue_work);
|
|
|
|
static u32 xo15_sci_gpe_handler(acpi_handle gpe_device, u32 gpe, void *context)
|
|
{
|
|
schedule_work(&sci_work);
|
|
return ACPI_INTERRUPT_HANDLED | ACPI_REENABLE_GPE;
|
|
}
|
|
|
|
static int xo15_sci_add(struct acpi_device *device)
|
|
{
|
|
unsigned long long tmp;
|
|
acpi_status status;
|
|
int r;
|
|
|
|
if (!device)
|
|
return -EINVAL;
|
|
|
|
strcpy(acpi_device_name(device), XO15_SCI_DEVICE_NAME);
|
|
strcpy(acpi_device_class(device), XO15_SCI_CLASS);
|
|
|
|
/* Get GPE bit assignment (EC events). */
|
|
status = acpi_evaluate_integer(device->handle, "_GPE", NULL, &tmp);
|
|
if (ACPI_FAILURE(status))
|
|
return -EINVAL;
|
|
|
|
xo15_sci_gpe = tmp;
|
|
status = acpi_install_gpe_handler(NULL, xo15_sci_gpe,
|
|
ACPI_GPE_EDGE_TRIGGERED,
|
|
xo15_sci_gpe_handler, device);
|
|
if (ACPI_FAILURE(status))
|
|
return -ENODEV;
|
|
|
|
dev_info(&device->dev, "Initialized, GPE = 0x%lx\n", xo15_sci_gpe);
|
|
|
|
r = sysfs_create_file(&device->dev.kobj, &lid_wake_on_close_attr.attr);
|
|
if (r)
|
|
goto err_sysfs;
|
|
|
|
/* Flush queue, and enable all SCI events */
|
|
process_sci_queue();
|
|
olpc_ec_mask_write(EC_SCI_SRC_ALL);
|
|
|
|
acpi_enable_gpe(NULL, xo15_sci_gpe);
|
|
|
|
/* Enable wake-on-EC */
|
|
if (device->wakeup.flags.valid)
|
|
device_init_wakeup(&device->dev, true);
|
|
|
|
return 0;
|
|
|
|
err_sysfs:
|
|
acpi_remove_gpe_handler(NULL, xo15_sci_gpe, xo15_sci_gpe_handler);
|
|
cancel_work_sync(&sci_work);
|
|
return r;
|
|
}
|
|
|
|
static int xo15_sci_remove(struct acpi_device *device)
|
|
{
|
|
acpi_disable_gpe(NULL, xo15_sci_gpe);
|
|
acpi_remove_gpe_handler(NULL, xo15_sci_gpe, xo15_sci_gpe_handler);
|
|
cancel_work_sync(&sci_work);
|
|
sysfs_remove_file(&device->dev.kobj, &lid_wake_on_close_attr.attr);
|
|
return 0;
|
|
}
|
|
|
|
static int xo15_sci_resume(struct device *dev)
|
|
{
|
|
/* Enable all EC events */
|
|
olpc_ec_mask_write(EC_SCI_SRC_ALL);
|
|
|
|
/* Power/battery status might have changed */
|
|
battery_status_changed();
|
|
ac_status_changed();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(xo15_sci_pm, NULL, xo15_sci_resume);
|
|
|
|
static const struct acpi_device_id xo15_sci_device_ids[] = {
|
|
{"XO15EC", 0},
|
|
{"", 0},
|
|
};
|
|
|
|
static struct acpi_driver xo15_sci_drv = {
|
|
.name = DRV_NAME,
|
|
.class = XO15_SCI_CLASS,
|
|
.ids = xo15_sci_device_ids,
|
|
.ops = {
|
|
.add = xo15_sci_add,
|
|
.remove = xo15_sci_remove,
|
|
},
|
|
.drv.pm = &xo15_sci_pm,
|
|
};
|
|
|
|
static int __init xo15_sci_init(void)
|
|
{
|
|
return acpi_bus_register_driver(&xo15_sci_drv);
|
|
}
|
|
device_initcall(xo15_sci_init);
|