htcleo: some bugfixes and cleanups on backlight manager driver
(by Danijel Posilovic)
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tytung
parent
ed13833f01
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326b2925fb
187
arch/arm/mach-msm/board-htcleo-btn_backlight-manager.c
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187
arch/arm/mach-msm/board-htcleo-btn_backlight-manager.c
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/* board-htcleo_btn_backlight-manager.c
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*
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* Driver for managing buttons backlight
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*
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* Copyright (C) 2010 Danijel Posilović (dan1j3l) <danijel.posilovic@gmail.com>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/keyboard.h>
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#include <linux/gpio.h>
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#include <linux/platform_device.h>
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#include <linux/workqueue.h>
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#include <linux/delay.h>
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#include <linux/timer.h>
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static int BUTTON_BACKLIGHT_GPIO = 48;
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static int OFF_SEC = 10;
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static int auto_off_enabled = 1;
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struct timer_list btn_off_timer;
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static DEFINE_MUTEX(htcleo_btn_manager_lock);
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////////////////////////////////////////////////////
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// off_sec sysfs
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static ssize_t htcleo_manager_offsec_get(struct device *dev,struct device_attribute *attr, char *buf)
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{
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int ret;
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ret = sprintf(buf, "%d", OFF_SEC);
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return ret;
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}
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static ssize_t htcleo_manager_offsec_set(struct device *dev,struct device_attribute *attr,const char *buf, size_t count)
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{
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int set_state;
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mutex_lock(&htcleo_btn_manager_lock);
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sscanf(buf, "%d", &set_state);
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if (set_state < 5)
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set_state = 5;
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if (set_state > 60)
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set_state=60;
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OFF_SEC = set_state;
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mutex_unlock(&htcleo_btn_manager_lock);
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return count;
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}
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static DEVICE_ATTR(off_seconds, 0666, htcleo_manager_offsec_get, htcleo_manager_offsec_set);
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// auto_off sysfs
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static ssize_t htcleo_manager_auto_off_get(struct device *dev,struct device_attribute *attr, char *buf)
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{
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int ret;
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ret = sprintf(buf, "%d", auto_off_enabled);
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return ret;
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}
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static ssize_t htcleo_manager_auto_off_set(struct device *dev,struct device_attribute *attr,const char *buf, size_t count)
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{
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int set_state;
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mutex_lock(&htcleo_btn_manager_lock);
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sscanf(buf, "%d", &set_state);
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if (set_state < 0)
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set_state = 0;
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if (set_state > 1)
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set_state=1;
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auto_off_enabled = set_state;
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mutex_unlock(&htcleo_btn_manager_lock);
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return count;
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}
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static DEVICE_ATTR(auto_off, 0666, htcleo_manager_auto_off_get, htcleo_manager_auto_off_set);
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static void btn_delayed_off_function(unsigned long function_parameter){
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gpio_set_value(BUTTON_BACKLIGHT_GPIO, 0);
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del_timer(&btn_off_timer);
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}
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int buttons_notify(struct notifier_block *nblock, unsigned long code, void *_param) {
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struct keyboard_notifier_param *param = _param;
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int keycode;
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if (code == KBD_KEYCODE) {
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keycode = param->value;
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//printk(KERN_DEBUG "BTN-BCKM: KEYLOGGER %i %s\n", param->value, (param->down ? "down" : "up"));
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// Turn backlight on only if pressed = Dial, home, winkey, back, end button
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if (keycode==231 || keycode==102 || keycode==139 || keycode==158 || keycode==107 ){
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gpio_set_value(BUTTON_BACKLIGHT_GPIO, 1);
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// If auto off enabled then buttons will turn off after declared amount of time, else screen backlight will turn them off
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if (auto_off_enabled){
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del_timer(&btn_off_timer);
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init_timer(&btn_off_timer);
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btn_off_timer.expires = jiffies + OFF_SEC*HZ;
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btn_off_timer.function = btn_delayed_off_function;
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add_timer(&btn_off_timer);
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}
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}
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};
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return 0;
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}
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static struct notifier_block nb = {
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.notifier_call = buttons_notify
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};
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static int htcleo_btn_backlight_manager_probe(struct platform_device *pdev)
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{
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int rc;
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printk("BTN-BCKM: Registering btn manager...\n");
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register_keyboard_notifier(&nb);
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rc = device_create_file(&pdev->dev, &dev_attr_off_seconds);
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rc = device_create_file(&pdev->dev, &dev_attr_auto_off);
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return 0;
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}
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static int htcleo_btn_backlight_manager_remove(struct platform_device *pdev)
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{
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printk("BTN-BCKM: Deactivating btn manager...\n");
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unregister_keyboard_notifier(&nb);
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device_remove_file(&pdev->dev, &dev_attr_off_seconds);
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device_remove_file(&pdev->dev,&dev_attr_auto_off);
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return 0;
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}
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static struct platform_driver htcleo_btn_backlight_manager = {
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.probe = htcleo_btn_backlight_manager_probe,
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.remove= htcleo_btn_backlight_manager_remove,
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.driver = {
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.name = "btn_backlight_manager",
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.owner = THIS_MODULE
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},
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};
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static int __init backlight_manager_init(void)
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{
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return platform_driver_register(&htcleo_btn_backlight_manager);
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}
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static void __exit backlight_manager_exit(void)
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{
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platform_driver_unregister(&htcleo_btn_backlight_manager);
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}
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module_init(backlight_manager_init);
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module_exit(backlight_manager_exit);
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MODULE_AUTHOR("Danijel Posilović (dan1j3l) <danijel.posilovic@gmail.com>");
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MODULE_DESCRIPTION("Button Backlight Manager");
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MODULE_LICENSE("GPL");
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