| /* |
| * 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); |