diff options
| -rw-r--r-- | drivers/platform/x86/dell-rbtn.c | 93 | ||||
| -rw-r--r-- | drivers/platform/x86/dell-rbtn.h | 24 |
2 files changed, 116 insertions, 1 deletions
diff --git a/drivers/platform/x86/dell-rbtn.c b/drivers/platform/x86/dell-rbtn.c index 1c19fff..cd410e3 100644 --- a/drivers/platform/x86/dell-rbtn.c +++ b/drivers/platform/x86/dell-rbtn.c @@ -233,6 +233,86 @@ static struct acpi_driver rbtn_driver = { /* + * notifier export functions + */ + +static bool auto_remove_rfkill = true; + +static ATOMIC_NOTIFIER_HEAD(rbtn_chain_head); + +static int rbtn_inc_count(struct device *dev, void *data) +{ + struct acpi_device *device = to_acpi_device(dev); + struct rbtn_data *rbtn_data = device->driver_data; + int *count = data; + + if (rbtn_data->type == RBTN_SLIDER) + (*count)++; + + return 0; +} + +static int rbtn_switch_dev(struct device *dev, void *data) +{ + struct acpi_device *device = to_acpi_device(dev); + struct rbtn_data *rbtn_data = device->driver_data; + bool enable = data; + + if (rbtn_data->type != RBTN_SLIDER) + return 0; + + if (enable) + rbtn_rfkill_init(device); + else + rbtn_rfkill_exit(device); + + return 0; +} + +int dell_rbtn_notifier_register(struct notifier_block *nb) +{ + bool first; + int count; + int ret; + + count = 0; + ret = driver_for_each_device(&rbtn_driver.drv, NULL, &count, + rbtn_inc_count); + if (ret || count == 0) + return -ENODEV; + + first = !rbtn_chain_head.head; + + ret = atomic_notifier_chain_register(&rbtn_chain_head, nb); + if (ret != 0) + return ret; + + if (auto_remove_rfkill && first) + ret = driver_for_each_device(&rbtn_driver.drv, NULL, + (void *)false, rbtn_switch_dev); + + return ret; +} +EXPORT_SYMBOL_GPL(dell_rbtn_notifier_register); + +int dell_rbtn_notifier_unregister(struct notifier_block *nb) +{ + int ret; + + ret = atomic_notifier_chain_unregister(&rbtn_chain_head, nb); + if (ret != 0) + return ret; + + if (auto_remove_rfkill && !rbtn_chain_head.head) + ret = driver_for_each_device(&rbtn_driver.drv, NULL, + (void *)true, rbtn_switch_dev); + + return ret; +} +EXPORT_SYMBOL_GPL(dell_rbtn_notifier_unregister); + + +/* * acpi driver functions */ @@ -266,7 +346,10 @@ static int rbtn_add(struct acpi_device *device) ret = rbtn_input_init(rbtn_data); break; case RBTN_SLIDER: - ret = rbtn_rfkill_init(device); + if (auto_remove_rfkill && rbtn_chain_head.head) + ret = 0; + else + ret = rbtn_rfkill_init(device); break; default: ret = -EINVAL; @@ -313,6 +396,7 @@ static void rbtn_notify(struct acpi_device *device, u32 event) break; case RBTN_SLIDER: rbtn_rfkill_event(device); + atomic_notifier_call_chain(&rbtn_chain_head, event, device); break; default: break; @@ -326,6 +410,13 @@ static void rbtn_notify(struct acpi_device *device, u32 event) module_acpi_driver(rbtn_driver); +module_param(auto_remove_rfkill, bool, 0444); + +MODULE_PARM_DESC(auto_remove_rfkill, "Automatically remove rfkill devices when " + "other modules start receiving events " + "from this module and re-add them when " + "the last module stops receiving events " + "(default true)"); MODULE_DEVICE_TABLE(acpi, rbtn_ids); MODULE_DESCRIPTION("Dell Airplane Mode Switch driver"); MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>"); diff --git a/drivers/platform/x86/dell-rbtn.h b/drivers/platform/x86/dell-rbtn.h new file mode 100644 index 0000000..c59cc6b --- /dev/null +++ b/drivers/platform/x86/dell-rbtn.h @@ -0,0 +1,24 @@ +/* + Dell Airplane Mode Switch driver + Copyright (C) 2014-2015 Pali Rohár <pali.rohar@gmail.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 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. +*/ + +#ifndef _DELL_RBTN_H_ +#define _DELL_RBTN_H_ + +struct notifier_block; + +int dell_rbtn_notifier_register(struct notifier_block *nb); +int dell_rbtn_notifier_unregister(struct notifier_block *nb); + +#endif |
