diff options
Diffstat (limited to 'drivers/platform/x86/ideapad_acpi.c')
| -rw-r--r-- | drivers/platform/x86/ideapad_acpi.c | 282 |
1 files changed, 282 insertions, 0 deletions
diff --git a/drivers/platform/x86/ideapad_acpi.c b/drivers/platform/x86/ideapad_acpi.c new file mode 100644 index 000000000000..ae744caf4726 --- /dev/null +++ b/drivers/platform/x86/ideapad_acpi.c @@ -0,0 +1,282 @@ +/* + * ideapad_acpi.c - Lenovo IdeaPad ACPI Extras + * + * Copyright © 2010 Intel Corporation + * Copyright © 2010 David Woodhouse <dwmw2@infradead.org> + * + * 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. + * + * 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., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/types.h> +#include <acpi/acpi_bus.h> +#include <acpi/acpi_drivers.h> +#include <linux/rfkill.h> + +#define IDEAPAD_DEV_CAMERA 0 +#define IDEAPAD_DEV_WLAN 1 +#define IDEAPAD_DEV_BLUETOOTH 2 +#define IDEAPAD_DEV_3G 3 +#define IDEAPAD_DEV_KILLSW 4 + +static struct rfkill *ideapad_rfkill[5]; + +static const char *ideapad_rfk_names[] = { + "ideapad_camera", "ideapad_wlan", "ideapad_bluetooth", "ideapad_3g", "ideapad_rfkill" +}; +static const int ideapad_rfk_types[] = { + 0, RFKILL_TYPE_WLAN, RFKILL_TYPE_BLUETOOTH, RFKILL_TYPE_WWAN, RFKILL_TYPE_WLAN +}; + +static int ideapad_dev_exists(int device) +{ + acpi_status status; + union acpi_object in_param; + struct acpi_object_list input = { 1, &in_param }; + struct acpi_buffer output; + union acpi_object out_obj; + + output.length = sizeof(out_obj); + output.pointer = &out_obj; + + in_param.type = ACPI_TYPE_INTEGER; + in_param.integer.value = device + 1; + + status = acpi_evaluate_object(NULL, "\\_SB_.DECN", &input, &output); + if (ACPI_FAILURE(status)) { + printk(KERN_WARNING "IdeaPAD \\_SB_.DECN method failed %d. Is this an IdeaPAD?\n", status); + return -ENODEV; + } + if (out_obj.type != ACPI_TYPE_INTEGER) { + printk(KERN_WARNING "IdeaPAD \\_SB_.DECN method returned unexpected type\n"); + return -ENODEV; + } + return out_obj.integer.value; +} + +static int ideapad_dev_get_state(int device) +{ + acpi_status status; + union acpi_object in_param; + struct acpi_object_list input = { 1, &in_param }; + struct acpi_buffer output; + union acpi_object out_obj; + + output.length = sizeof(out_obj); + output.pointer = &out_obj; + + in_param.type = ACPI_TYPE_INTEGER; + in_param.integer.value = device + 1; + + status = acpi_evaluate_object(NULL, "\\_SB_.GECN", &input, &output); + if (ACPI_FAILURE(status)) { + printk(KERN_WARNING "IdeaPAD \\_SB_.GECN method failed %d\n", status); + return -ENODEV; + } + if (out_obj.type != ACPI_TYPE_INTEGER) { + printk(KERN_WARNING "IdeaPAD \\_SB_.GECN method returned unexpected type\n"); + return -ENODEV; + } + return out_obj.integer.value; +} + +static int ideapad_dev_set_state(int device, int state) +{ + acpi_status status; + union acpi_object in_params[2]; + struct acpi_object_list input = { 2, in_params }; + + in_params[0].type = ACPI_TYPE_INTEGER; + in_params[0].integer.value = device + 1; + in_params[1].type = ACPI_TYPE_INTEGER; + in_params[1].integer.value = state; + + status = acpi_evaluate_object(NULL, "\\_SB_.SECN", &input, NULL); + if (ACPI_FAILURE(status)) { + printk(KERN_WARNING "IdeaPAD \\_SB_.SECN method failed %d\n", status); + return -ENODEV; + } + return 0; +} +static ssize_t show_ideapad_cam(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + int state = ideapad_dev_get_state(IDEAPAD_DEV_CAMERA); + if (state < 0) + return state; + + return sprintf(buf, "%d\n", state); +} + +static ssize_t store_ideapad_cam(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + int ret, state; + + if (!count) + return 0; + if (sscanf(buf, "%i", &state) != 1) + return -EINVAL; + ret = ideapad_dev_set_state(IDEAPAD_DEV_CAMERA, state); + if (ret < 0) + return ret; + return count; +} + +static DEVICE_ATTR(camera_power, 0644, show_ideapad_cam, store_ideapad_cam); + +static int ideapad_rfk_set(void *data, bool blocked) +{ + int device = (unsigned long)data; + + if (device == IDEAPAD_DEV_KILLSW) + return -EINVAL; + return ideapad_dev_set_state(device, !blocked); +} + +static struct rfkill_ops ideapad_rfk_ops = { + .set_block = ideapad_rfk_set, +}; + +static void ideapad_sync_rfk_state(void) +{ + int hw_blocked = !ideapad_dev_get_state(IDEAPAD_DEV_KILLSW); + int i; + + rfkill_set_hw_state(ideapad_rfkill[IDEAPAD_DEV_KILLSW], hw_blocked); + for (i = IDEAPAD_DEV_WLAN; i < IDEAPAD_DEV_KILLSW; i++) + if (ideapad_rfkill[i]) + rfkill_set_hw_state(ideapad_rfkill[i], hw_blocked); + if (hw_blocked) + return; + + for (i = IDEAPAD_DEV_WLAN; i < IDEAPAD_DEV_KILLSW; i++) + if (ideapad_rfkill[i]) + rfkill_set_sw_state(ideapad_rfkill[i], !ideapad_dev_get_state(i)); +} + +static int ideapad_register_rfkill(struct acpi_device *device, int dev) +{ + int ret; + + ideapad_rfkill[dev] = rfkill_alloc(ideapad_rfk_names[dev], &device->dev, + ideapad_rfk_types[dev], &ideapad_rfk_ops, + (void *)(long)dev); + if (!ideapad_rfkill[dev]) + return -ENOMEM; + + ret = rfkill_register(ideapad_rfkill[dev]); + if (ret) { + rfkill_destroy(ideapad_rfkill[dev]); + return ret; + } + return 0; +} + +static void ideapad_unregister_rfkill(int dev) +{ + if (!ideapad_rfkill[dev]) + return; + + rfkill_unregister(ideapad_rfkill[dev]); + rfkill_destroy(ideapad_rfkill[dev]); +} + +static const struct acpi_device_id ideapad_device_ids[] = { + { "VPC2004", 0}, + { "", 0}, +}; +MODULE_DEVICE_TABLE(acpi, ideapad_device_ids); + +static int ideapad_acpi_add(struct acpi_device *device) +{ + int i; + int devs_present[5]; + + for (i = IDEAPAD_DEV_CAMERA; i < IDEAPAD_DEV_KILLSW; i++) { + devs_present[i] = ideapad_dev_exists(i); + if (devs_present[i] < 0) + return devs_present[i]; + } + + /* The hardware switch is always present */ + devs_present[IDEAPAD_DEV_KILLSW] = 1; + + if (devs_present[IDEAPAD_DEV_CAMERA]) { + int ret = device_create_file(&device->dev, &dev_attr_camera_power); + if (ret) + return ret; + } + + for (i = IDEAPAD_DEV_WLAN; i <= IDEAPAD_DEV_KILLSW; i++) { + if (!devs_present[i]) + continue; + + ideapad_register_rfkill(device, i); + } + ideapad_sync_rfk_state(); + return 0; +} + +static int ideapad_acpi_remove(struct acpi_device *device, int type) +{ + int i; + device_remove_file(&device->dev, &dev_attr_camera_power); + for (i = 0; i < 5; i++) + ideapad_unregister_rfkill(i); + return 0; +} + +static void ideapad_acpi_notify(struct acpi_device *device, u32 event) +{ + ideapad_sync_rfk_state(); +} + +static struct acpi_driver ideapad_acpi_driver = { + .name = "ideapad_acpi", + .class = "IdeaPad", + .ids = ideapad_device_ids, + .ops.add = ideapad_acpi_add, + .ops.remove = ideapad_acpi_remove, + .ops.notify = ideapad_acpi_notify, + .owner = THIS_MODULE, +}; + + +static int __init ideapad_acpi_module_init(void) +{ + acpi_bus_register_driver(&ideapad_acpi_driver); + + return 0; +} + + +static void __exit ideapad_acpi_module_exit(void) +{ + acpi_bus_unregister_driver(&ideapad_acpi_driver); + +} + +MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); +MODULE_DESCRIPTION("IdeaPad ACPI Extras"); +MODULE_LICENSE("GPL"); + +module_init(ideapad_acpi_module_init); +module_exit(ideapad_acpi_module_exit); |