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231 lines
5.1 KiB
231 lines
5.1 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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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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#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_warn(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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