2
* Support for OLPC XO-1.5 System Control Interrupts (SCI)
4
* Copyright (C) 2009-2010 One Laptop per Child
6
* This program is free software; you can redistribute it and/or modify
7
* it under the terms of the GNU General Public License as published by
8
* the Free Software Foundation; either version 2 of the License, or
9
* (at your option) any later version.
12
#include <linux/device.h>
13
#include <linux/slab.h>
14
#include <linux/workqueue.h>
15
#include <linux/power_supply.h>
17
#include <acpi/acpi_bus.h>
18
#include <acpi/acpi_drivers.h>
21
#define DRV_NAME "olpc-xo15-sci"
22
#define PFX DRV_NAME ": "
23
#define XO15_SCI_CLASS DRV_NAME
24
#define XO15_SCI_DEVICE_NAME "OLPC XO-1.5 SCI"
26
static unsigned long xo15_sci_gpe;
28
static void battery_status_changed(void)
30
struct power_supply *psy = power_supply_get_by_name("olpc-battery");
33
power_supply_changed(psy);
38
static void ac_status_changed(void)
40
struct power_supply *psy = power_supply_get_by_name("olpc-ac");
43
power_supply_changed(psy);
48
static void process_sci_queue(void)
54
r = olpc_ec_sci_query(&data);
58
pr_debug(PFX "SCI 0x%x received\n", data);
61
case EC_SCI_SRC_BATERR:
62
case EC_SCI_SRC_BATSOC:
63
case EC_SCI_SRC_BATTERY:
64
case EC_SCI_SRC_BATCRIT:
65
battery_status_changed();
67
case EC_SCI_SRC_ACPWR:
74
pr_err(PFX "Failed to clear SCI queue");
77
static void process_sci_queue_work(struct work_struct *work)
82
static DECLARE_WORK(sci_work, process_sci_queue_work);
84
static u32 xo15_sci_gpe_handler(acpi_handle gpe_device, u32 gpe, void *context)
86
schedule_work(&sci_work);
87
return ACPI_INTERRUPT_HANDLED | ACPI_REENABLE_GPE;
90
static int xo15_sci_add(struct acpi_device *device)
92
unsigned long long tmp;
98
strcpy(acpi_device_name(device), XO15_SCI_DEVICE_NAME);
99
strcpy(acpi_device_class(device), XO15_SCI_CLASS);
101
/* Get GPE bit assignment (EC events). */
102
status = acpi_evaluate_integer(device->handle, "_GPE", NULL, &tmp);
103
if (ACPI_FAILURE(status))
107
status = acpi_install_gpe_handler(NULL, xo15_sci_gpe,
108
ACPI_GPE_EDGE_TRIGGERED,
109
xo15_sci_gpe_handler, device);
110
if (ACPI_FAILURE(status))
113
dev_info(&device->dev, "Initialized, GPE = 0x%lx\n", xo15_sci_gpe);
115
/* Flush queue, and enable all SCI events */
117
olpc_ec_mask_write(EC_SCI_SRC_ALL);
119
acpi_enable_gpe(NULL, xo15_sci_gpe);
121
/* Enable wake-on-EC */
122
if (device->wakeup.flags.valid)
123
device_init_wakeup(&device->dev, true);
128
static int xo15_sci_remove(struct acpi_device *device, int type)
130
acpi_disable_gpe(NULL, xo15_sci_gpe);
131
acpi_remove_gpe_handler(NULL, xo15_sci_gpe, xo15_sci_gpe_handler);
132
cancel_work_sync(&sci_work);
136
static int xo15_sci_resume(struct acpi_device *device)
138
/* Enable all EC events */
139
olpc_ec_mask_write(EC_SCI_SRC_ALL);
141
/* Power/battery status might have changed */
142
battery_status_changed();
148
static const struct acpi_device_id xo15_sci_device_ids[] = {
153
static struct acpi_driver xo15_sci_drv = {
155
.class = XO15_SCI_CLASS,
156
.ids = xo15_sci_device_ids,
159
.remove = xo15_sci_remove,
160
.resume = xo15_sci_resume,
164
static int __init xo15_sci_init(void)
166
return acpi_bus_register_driver(&xo15_sci_drv);
168
device_initcall(xo15_sci_init);