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>
16 #include <linux/olpc-ec.h>
18 #include <acpi/acpi_bus.h>
19 #include <acpi/acpi_drivers.h>
22 #define DRV_NAME "olpc-xo15-sci"
23 #define PFX DRV_NAME ": "
24 #define XO15_SCI_CLASS DRV_NAME
25 #define XO15_SCI_DEVICE_NAME "OLPC XO-1.5 SCI"
27 static unsigned long xo15_sci_gpe;
28 static bool lid_wake_on_close;
31 * The normal ACPI LID wakeup behavior is wake-on-open, but not
32 * wake-on-close. This is implemented as standard by the XO-1.5 DSDT.
34 * We provide here a sysfs attribute that will additionally enable
35 * wake-on-close behavior. This is useful (e.g.) when we oportunistically
36 * suspend with the display running; if the lid is then closed, we want to
37 * wake up to turn the display off.
39 * This is controlled through a custom method in the XO-1.5 DSDT.
41 static int set_lid_wake_behavior(bool wake_on_close)
45 status = acpi_execute_simple_method(NULL, "\\_SB.PCI0.LID.LIDW", wake_on_close);
46 if (ACPI_FAILURE(status)) {
47 pr_warning(PFX "failed to set lid behavior\n");
51 lid_wake_on_close = wake_on_close;
57 lid_wake_on_close_show(struct kobject *s, struct kobj_attribute *attr, char *buf)
59 return sprintf(buf, "%u\n", lid_wake_on_close);
62 static ssize_t lid_wake_on_close_store(struct kobject *s,
63 struct kobj_attribute *attr,
64 const char *buf, size_t n)
68 if (sscanf(buf, "%u", &val) != 1)
71 set_lid_wake_behavior(!!val);
76 static struct kobj_attribute lid_wake_on_close_attr =
77 __ATTR(lid_wake_on_close, 0644,
78 lid_wake_on_close_show,
79 lid_wake_on_close_store);
81 static void battery_status_changed(void)
83 struct power_supply *psy = power_supply_get_by_name("olpc-battery");
86 power_supply_changed(psy);
91 static void ac_status_changed(void)
93 struct power_supply *psy = power_supply_get_by_name("olpc-ac");
96 power_supply_changed(psy);
101 static void process_sci_queue(void)
107 r = olpc_ec_sci_query(&data);
111 pr_debug(PFX "SCI 0x%x received\n", data);
114 case EC_SCI_SRC_BATERR:
115 case EC_SCI_SRC_BATSOC:
116 case EC_SCI_SRC_BATTERY:
117 case EC_SCI_SRC_BATCRIT:
118 battery_status_changed();
120 case EC_SCI_SRC_ACPWR:
127 pr_err(PFX "Failed to clear SCI queue");
130 static void process_sci_queue_work(struct work_struct *work)
135 static DECLARE_WORK(sci_work, process_sci_queue_work);
137 static u32 xo15_sci_gpe_handler(acpi_handle gpe_device, u32 gpe, void *context)
139 schedule_work(&sci_work);
140 return ACPI_INTERRUPT_HANDLED | ACPI_REENABLE_GPE;
143 static int xo15_sci_add(struct acpi_device *device)
145 unsigned long long tmp;
152 strcpy(acpi_device_name(device), XO15_SCI_DEVICE_NAME);
153 strcpy(acpi_device_class(device), XO15_SCI_CLASS);
155 /* Get GPE bit assignment (EC events). */
156 status = acpi_evaluate_integer(device->handle, "_GPE", NULL, &tmp);
157 if (ACPI_FAILURE(status))
161 status = acpi_install_gpe_handler(NULL, xo15_sci_gpe,
162 ACPI_GPE_EDGE_TRIGGERED,
163 xo15_sci_gpe_handler, device);
164 if (ACPI_FAILURE(status))
167 dev_info(&device->dev, "Initialized, GPE = 0x%lx\n", xo15_sci_gpe);
169 r = sysfs_create_file(&device->dev.kobj, &lid_wake_on_close_attr.attr);
173 /* Flush queue, and enable all SCI events */
175 olpc_ec_mask_write(EC_SCI_SRC_ALL);
177 acpi_enable_gpe(NULL, xo15_sci_gpe);
179 /* Enable wake-on-EC */
180 if (device->wakeup.flags.valid)
181 device_init_wakeup(&device->dev, true);
186 acpi_remove_gpe_handler(NULL, xo15_sci_gpe, xo15_sci_gpe_handler);
187 cancel_work_sync(&sci_work);
191 static int xo15_sci_remove(struct acpi_device *device)
193 acpi_disable_gpe(NULL, xo15_sci_gpe);
194 acpi_remove_gpe_handler(NULL, xo15_sci_gpe, xo15_sci_gpe_handler);
195 cancel_work_sync(&sci_work);
196 sysfs_remove_file(&device->dev.kobj, &lid_wake_on_close_attr.attr);
200 static int xo15_sci_resume(struct device *dev)
202 /* Enable all EC events */
203 olpc_ec_mask_write(EC_SCI_SRC_ALL);
205 /* Power/battery status might have changed */
206 battery_status_changed();
212 static SIMPLE_DEV_PM_OPS(xo15_sci_pm, NULL, xo15_sci_resume);
214 static const struct acpi_device_id xo15_sci_device_ids[] = {
219 static struct acpi_driver xo15_sci_drv = {
221 .class = XO15_SCI_CLASS,
222 .ids = xo15_sci_device_ids,
225 .remove = xo15_sci_remove,
227 .drv.pm = &xo15_sci_pm,
230 static int __init xo15_sci_init(void)
232 return acpi_bus_register_driver(&xo15_sci_drv);
234 device_initcall(xo15_sci_init);