/*
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* Support for OLPC XO-1.5 System Control Interrupts (SCI)
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*
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* Copyright (C) 2009-2010 One Laptop per Child
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/workqueue.h>
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#include <linux/power_supply.h>
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#include <linux/olpc-ec.h>
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#include <linux/acpi.h>
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#include <asm/olpc.h>
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#define DRV_NAME "olpc-xo15-sci"
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#define PFX DRV_NAME ": "
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#define XO15_SCI_CLASS DRV_NAME
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#define XO15_SCI_DEVICE_NAME "OLPC XO-1.5 SCI"
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static unsigned long xo15_sci_gpe;
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static bool lid_wake_on_close;
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/*
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* The normal ACPI LID wakeup behavior is wake-on-open, but not
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* wake-on-close. This is implemented as standard by the XO-1.5 DSDT.
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*
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* We provide here a sysfs attribute that will additionally enable
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* wake-on-close behavior. This is useful (e.g.) when we oportunistically
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* suspend with the display running; if the lid is then closed, we want to
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* wake up to turn the display off.
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*
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* This is controlled through a custom method in the XO-1.5 DSDT.
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*/
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static int set_lid_wake_behavior(bool wake_on_close)
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{
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acpi_status status;
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status = acpi_execute_simple_method(NULL, "\\_SB.PCI0.LID.LIDW", wake_on_close);
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if (ACPI_FAILURE(status)) {
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pr_warning(PFX "failed to set lid behavior\n");
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return 1;
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}
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lid_wake_on_close = wake_on_close;
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return 0;
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}
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static ssize_t
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lid_wake_on_close_show(struct kobject *s, struct kobj_attribute *attr, char *buf)
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{
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return sprintf(buf, "%u\n", lid_wake_on_close);
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}
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static ssize_t lid_wake_on_close_store(struct kobject *s,
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struct kobj_attribute *attr,
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const char *buf, size_t n)
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{
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unsigned int val;
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if (sscanf(buf, "%u", &val) != 1)
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return -EINVAL;
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set_lid_wake_behavior(!!val);
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return n;
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}
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static struct kobj_attribute lid_wake_on_close_attr =
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__ATTR(lid_wake_on_close, 0644,
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lid_wake_on_close_show,
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lid_wake_on_close_store);
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static void battery_status_changed(void)
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{
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struct power_supply *psy = power_supply_get_by_name("olpc-battery");
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if (psy) {
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power_supply_changed(psy);
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power_supply_put(psy);
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}
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}
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static void ac_status_changed(void)
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{
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struct power_supply *psy = power_supply_get_by_name("olpc-ac");
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if (psy) {
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power_supply_changed(psy);
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power_supply_put(psy);
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}
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}
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static void process_sci_queue(void)
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{
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u16 data;
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int r;
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do {
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r = olpc_ec_sci_query(&data);
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if (r || !data)
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break;
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pr_debug(PFX "SCI 0x%x received\n", data);
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switch (data) {
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case EC_SCI_SRC_BATERR:
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case EC_SCI_SRC_BATSOC:
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case EC_SCI_SRC_BATTERY:
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case EC_SCI_SRC_BATCRIT:
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battery_status_changed();
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break;
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case EC_SCI_SRC_ACPWR:
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ac_status_changed();
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break;
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}
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} while (data);
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if (r)
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pr_err(PFX "Failed to clear SCI queue");
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}
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static void process_sci_queue_work(struct work_struct *work)
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{
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process_sci_queue();
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}
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static DECLARE_WORK(sci_work, process_sci_queue_work);
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static u32 xo15_sci_gpe_handler(acpi_handle gpe_device, u32 gpe, void *context)
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{
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schedule_work(&sci_work);
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return ACPI_INTERRUPT_HANDLED | ACPI_REENABLE_GPE;
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}
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static int xo15_sci_add(struct acpi_device *device)
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{
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unsigned long long tmp;
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acpi_status status;
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int r;
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if (!device)
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return -EINVAL;
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strcpy(acpi_device_name(device), XO15_SCI_DEVICE_NAME);
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strcpy(acpi_device_class(device), XO15_SCI_CLASS);
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/* Get GPE bit assignment (EC events). */
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status = acpi_evaluate_integer(device->handle, "_GPE", NULL, &tmp);
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if (ACPI_FAILURE(status))
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return -EINVAL;
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xo15_sci_gpe = tmp;
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status = acpi_install_gpe_handler(NULL, xo15_sci_gpe,
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ACPI_GPE_EDGE_TRIGGERED,
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xo15_sci_gpe_handler, device);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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dev_info(&device->dev, "Initialized, GPE = 0x%lx\n", xo15_sci_gpe);
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r = sysfs_create_file(&device->dev.kobj, &lid_wake_on_close_attr.attr);
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if (r)
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goto err_sysfs;
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/* Flush queue, and enable all SCI events */
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process_sci_queue();
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olpc_ec_mask_write(EC_SCI_SRC_ALL);
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acpi_enable_gpe(NULL, xo15_sci_gpe);
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/* Enable wake-on-EC */
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if (device->wakeup.flags.valid)
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device_init_wakeup(&device->dev, true);
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return 0;
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err_sysfs:
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acpi_remove_gpe_handler(NULL, xo15_sci_gpe, xo15_sci_gpe_handler);
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cancel_work_sync(&sci_work);
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return r;
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}
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static int xo15_sci_remove(struct acpi_device *device)
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{
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acpi_disable_gpe(NULL, xo15_sci_gpe);
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acpi_remove_gpe_handler(NULL, xo15_sci_gpe, xo15_sci_gpe_handler);
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cancel_work_sync(&sci_work);
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sysfs_remove_file(&device->dev.kobj, &lid_wake_on_close_attr.attr);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int xo15_sci_resume(struct device *dev)
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{
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/* Enable all EC events */
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olpc_ec_mask_write(EC_SCI_SRC_ALL);
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/* Power/battery status might have changed */
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battery_status_changed();
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ac_status_changed();
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(xo15_sci_pm, NULL, xo15_sci_resume);
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static const struct acpi_device_id xo15_sci_device_ids[] = {
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{"XO15EC", 0},
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{"", 0},
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};
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static struct acpi_driver xo15_sci_drv = {
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.name = DRV_NAME,
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.class = XO15_SCI_CLASS,
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.ids = xo15_sci_device_ids,
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.ops = {
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.add = xo15_sci_add,
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.remove = xo15_sci_remove,
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},
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.drv.pm = &xo15_sci_pm,
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};
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static int __init xo15_sci_init(void)
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{
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return acpi_bus_register_driver(&xo15_sci_drv);
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}
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device_initcall(xo15_sci_init);
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