diff options
Diffstat (limited to 'drivers/pnp/pnpacpi/core.c')
| -rw-r--r-- | drivers/pnp/pnpacpi/core.c | 387 |
1 files changed, 387 insertions, 0 deletions
diff --git a/drivers/pnp/pnpacpi/core.c b/drivers/pnp/pnpacpi/core.c new file mode 100644 index 00000000..d21e8f59 --- /dev/null +++ b/drivers/pnp/pnpacpi/core.c @@ -0,0 +1,387 @@ +/* + * pnpacpi -- PnP ACPI driver + * + * Copyright (c) 2004 Matthieu Castet <castet.matthieu@free.fr> + * Copyright (c) 2004 Li Shaohua <shaohua.li@intel.com> + * + * 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, or (at your option) any + * later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/export.h> +#include <linux/acpi.h> +#include <linux/pnp.h> +#include <linux/slab.h> +#include <linux/mod_devicetable.h> +#include <acpi/acpi_bus.h> + +#include "../base.h" +#include "pnpacpi.h" + +static int num; + +/* We need only to blacklist devices that have already an acpi driver that + * can't use pnp layer. We don't need to blacklist device that are directly + * used by the kernel (PCI root, ...), as it is harmless and there were + * already present in pnpbios. But there is an exception for devices that + * have irqs (PIC, Timer) because we call acpi_register_gsi. + * Finally, only devices that have a CRS method need to be in this list. + */ +static struct acpi_device_id excluded_id_list[] __initdata = { + {"PNP0C09", 0}, /* EC */ + {"PNP0C0F", 0}, /* Link device */ + {"PNP0000", 0}, /* PIC */ + {"PNP0100", 0}, /* Timer */ + {"", 0}, +}; + +static inline int __init is_exclusive_device(struct acpi_device *dev) +{ + return (!acpi_match_device_ids(dev, excluded_id_list)); +} + +/* + * Compatible Device IDs + */ +#define TEST_HEX(c) \ + if (!(('0' <= (c) && (c) <= '9') || ('A' <= (c) && (c) <= 'F'))) \ + return 0 +#define TEST_ALPHA(c) \ + if (!('@' <= (c) || (c) <= 'Z')) \ + return 0 +static int __init ispnpidacpi(const char *id) +{ + TEST_ALPHA(id[0]); + TEST_ALPHA(id[1]); + TEST_ALPHA(id[2]); + TEST_HEX(id[3]); + TEST_HEX(id[4]); + TEST_HEX(id[5]); + TEST_HEX(id[6]); + if (id[7] != '\0') + return 0; + return 1; +} + +static int pnpacpi_get_resources(struct pnp_dev *dev) +{ + pnp_dbg(&dev->dev, "get resources\n"); + return pnpacpi_parse_allocated_resource(dev); +} + +static int pnpacpi_set_resources(struct pnp_dev *dev) +{ + struct acpi_device *acpi_dev; + acpi_handle handle; + struct acpi_buffer buffer; + int ret; + + pnp_dbg(&dev->dev, "set resources\n"); + + handle = DEVICE_ACPI_HANDLE(&dev->dev); + if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &acpi_dev))) { + dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__); + return -ENODEV; + } + + ret = pnpacpi_build_resource_template(dev, &buffer); + if (ret) + return ret; + ret = pnpacpi_encode_resources(dev, &buffer); + if (ret) { + kfree(buffer.pointer); + return ret; + } + if (ACPI_FAILURE(acpi_set_current_resources(handle, &buffer))) + ret = -EINVAL; + else if (acpi_bus_power_manageable(handle)) + ret = acpi_bus_set_power(handle, ACPI_STATE_D0); + kfree(buffer.pointer); + return ret; +} + +static int pnpacpi_disable_resources(struct pnp_dev *dev) +{ + struct acpi_device *acpi_dev; + acpi_handle handle; + int ret; + + dev_dbg(&dev->dev, "disable resources\n"); + + handle = DEVICE_ACPI_HANDLE(&dev->dev); + if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &acpi_dev))) { + dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__); + return 0; + } + + /* acpi_unregister_gsi(pnp_irq(dev, 0)); */ + ret = 0; + if (acpi_bus_power_manageable(handle)) + acpi_bus_set_power(handle, ACPI_STATE_D3); + /* continue even if acpi_bus_set_power() fails */ + if (ACPI_FAILURE(acpi_evaluate_object(handle, "_DIS", NULL, NULL))) + ret = -ENODEV; + return ret; +} + +#ifdef CONFIG_ACPI_SLEEP +static bool pnpacpi_can_wakeup(struct pnp_dev *dev) +{ + struct acpi_device *acpi_dev; + acpi_handle handle; + + handle = DEVICE_ACPI_HANDLE(&dev->dev); + if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &acpi_dev))) { + dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__); + return false; + } + + return acpi_bus_can_wakeup(handle); +} + +static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state) +{ + struct acpi_device *acpi_dev; + acpi_handle handle; + int error = 0; + + handle = DEVICE_ACPI_HANDLE(&dev->dev); + if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &acpi_dev))) { + dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__); + return 0; + } + + if (device_can_wakeup(&dev->dev)) { + error = acpi_pm_device_sleep_wake(&dev->dev, + device_may_wakeup(&dev->dev)); + if (error) + return error; + } + + if (acpi_bus_power_manageable(handle)) { + int power_state = acpi_pm_device_sleep_state(&dev->dev, NULL); + + if (power_state < 0) + power_state = (state.event == PM_EVENT_ON) ? + ACPI_STATE_D0 : ACPI_STATE_D3; + + /* + * acpi_bus_set_power() often fails (keyboard port can't be + * powered-down?), and in any case, our return value is ignored + * by pnp_bus_suspend(). Hence we don't revert the wakeup + * setting if the set_power fails. + */ + error = acpi_bus_set_power(handle, power_state); + } + + return error; +} + +static int pnpacpi_resume(struct pnp_dev *dev) +{ + struct acpi_device *acpi_dev; + acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev); + int error = 0; + + if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &acpi_dev))) { + dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__); + return -ENODEV; + } + + if (device_may_wakeup(&dev->dev)) + acpi_pm_device_sleep_wake(&dev->dev, false); + + if (acpi_bus_power_manageable(handle)) + error = acpi_bus_set_power(handle, ACPI_STATE_D0); + + return error; +} +#endif + +struct pnp_protocol pnpacpi_protocol = { + .name = "Plug and Play ACPI", + .get = pnpacpi_get_resources, + .set = pnpacpi_set_resources, + .disable = pnpacpi_disable_resources, +#ifdef CONFIG_ACPI_SLEEP + .can_wakeup = pnpacpi_can_wakeup, + .suspend = pnpacpi_suspend, + .resume = pnpacpi_resume, +#endif +}; +EXPORT_SYMBOL(pnpacpi_protocol); + +static char *__init pnpacpi_get_id(struct acpi_device *device) +{ + struct acpi_hardware_id *id; + + list_for_each_entry(id, &device->pnp.ids, list) { + if (ispnpidacpi(id->id)) + return id->id; + } + + return NULL; +} + +static int __init pnpacpi_add_device(struct acpi_device *device) +{ + acpi_handle temp = NULL; + acpi_status status; + struct pnp_dev *dev; + char *pnpid; + struct acpi_hardware_id *id; + + /* + * If a PnPacpi device is not present , the device + * driver should not be loaded. + */ + status = acpi_get_handle(device->handle, "_CRS", &temp); + if (ACPI_FAILURE(status)) + return 0; + + pnpid = pnpacpi_get_id(device); + if (!pnpid) + return 0; + + if (is_exclusive_device(device) || !device->status.present) + return 0; + + dev = pnp_alloc_dev(&pnpacpi_protocol, num, pnpid); + if (!dev) + return -ENOMEM; + + dev->data = device; + /* .enabled means the device can decode the resources */ + dev->active = device->status.enabled; + status = acpi_get_handle(device->handle, "_SRS", &temp); + if (ACPI_SUCCESS(status)) + dev->capabilities |= PNP_CONFIGURABLE; + dev->capabilities |= PNP_READ; + if (device->flags.dynamic_status && (dev->capabilities & PNP_CONFIGURABLE)) + dev->capabilities |= PNP_WRITE; + if (device->flags.removable) + dev->capabilities |= PNP_REMOVABLE; + status = acpi_get_handle(device->handle, "_DIS", &temp); + if (ACPI_SUCCESS(status)) + dev->capabilities |= PNP_DISABLE; + + if (strlen(acpi_device_name(device))) + strncpy(dev->name, acpi_device_name(device), sizeof(dev->name)); + else + strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name)); + + if (dev->active) + pnpacpi_parse_allocated_resource(dev); + + if (dev->capabilities & PNP_CONFIGURABLE) + pnpacpi_parse_resource_option_data(dev); + + list_for_each_entry(id, &device->pnp.ids, list) { + if (!strcmp(id->id, pnpid)) + continue; + if (!ispnpidacpi(id->id)) + continue; + pnp_add_id(dev, id->id); + } + + /* clear out the damaged flags */ + if (!dev->active) + pnp_init_resources(dev); + pnp_add_device(dev); + num++; + + return AE_OK; +} + +static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle, + u32 lvl, void *context, + void **rv) +{ + struct acpi_device *device; + + if (!acpi_bus_get_device(handle, &device)) + pnpacpi_add_device(device); + else + return AE_CTRL_DEPTH; + return AE_OK; +} + +static int __init acpi_pnp_match(struct device *dev, void *_pnp) +{ + struct acpi_device *acpi = to_acpi_device(dev); + struct pnp_dev *pnp = _pnp; + struct device *physical_device; + + physical_device = acpi_get_physical_device(acpi->handle); + if (physical_device) + put_device(physical_device); + + /* true means it matched */ + return !physical_device + && compare_pnp_id(pnp->id, acpi_device_hid(acpi)); +} + +static int __init acpi_pnp_find_device(struct device *dev, acpi_handle * handle) +{ + struct device *adev; + struct acpi_device *acpi; + + adev = bus_find_device(&acpi_bus_type, NULL, + to_pnp_dev(dev), acpi_pnp_match); + if (!adev) + return -ENODEV; + + acpi = to_acpi_device(adev); + *handle = acpi->handle; + put_device(adev); + return 0; +} + +/* complete initialization of a PNPACPI device includes having + * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling. + */ +static struct acpi_bus_type __initdata acpi_pnp_bus = { + .bus = &pnp_bus_type, + .find_device = acpi_pnp_find_device, +}; + +int pnpacpi_disabled __initdata; +static int __init pnpacpi_init(void) +{ + if (acpi_disabled || pnpacpi_disabled) { + printk(KERN_INFO "pnp: PnP ACPI: disabled\n"); + return 0; + } + printk(KERN_INFO "pnp: PnP ACPI init\n"); + pnp_register_protocol(&pnpacpi_protocol); + register_acpi_bus_type(&acpi_pnp_bus); + acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL); + printk(KERN_INFO "pnp: PnP ACPI: found %d devices\n", num); + unregister_acpi_bus_type(&acpi_pnp_bus); + pnp_platform_devices = 1; + return 0; +} + +fs_initcall(pnpacpi_init); + +static int __init pnpacpi_setup(char *str) +{ + if (str == NULL) + return 1; + if (!strncmp(str, "off", 3)) + pnpacpi_disabled = 1; + return 1; +} + +__setup("pnpacpi=", pnpacpi_setup); |