mirror of https://gitee.com/openkylin/linux.git
android: remove timed output/gpio driver
timed_output was only used by the Android vibrator HAL which has now learned how to use LED triggers instead[1]. Any users of it in AOSP are on ancient kernels. Adding support for LED triggers is purely DT changes and proper kernel config. [1] https://android.googlesource.com/platform%2Fhardware%2Flibhardware/+/61701df363310a5cbd95e3e1638baa9526e42c9b Cc: John Stultz <john.stultz@linaro.org> Cc: "Arve Hjønnevåg" <arve@android.com> Cc: Riley Andrews <riandrews@android.com> Signed-off-by: Rob Herring <robh@kernel.org> Acked-by: John Stultz <john.stultz@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rob Herring
Greg Kroah-Hartman
parent
64938182e7
commit
9f6b68774f
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@ -14,20 +14,6 @@ config ASHMEM
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It is, in theory, a good memory allocator for low-memory devices,
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because it can discard shared memory units when under memory pressure.
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config ANDROID_TIMED_OUTPUT
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bool "Timed output class driver"
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default y
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config ANDROID_TIMED_GPIO
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tristate "Android timed gpio driver"
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depends on GPIOLIB || COMPILE_TEST
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depends on ANDROID_TIMED_OUTPUT
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default n
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---help---
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Unlike generic gpio is to allow programs to access and manipulate gpio
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registers from user space, timed output/gpio is a system to allow changing
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a gpio pin and restore it automatically after a specified timeout.
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config ANDROID_LOW_MEMORY_KILLER
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bool "Android Low Memory Killer"
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---help---
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@ -3,8 +3,6 @@ ccflags-y += -I$(src) # needed for trace events
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obj-y += ion/
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obj-$(CONFIG_ASHMEM) += ashmem.o
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obj-$(CONFIG_ANDROID_TIMED_OUTPUT) += timed_output.o
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obj-$(CONFIG_ANDROID_TIMED_GPIO) += timed_gpio.o
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obj-$(CONFIG_ANDROID_LOW_MEMORY_KILLER) += lowmemorykiller.o
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obj-$(CONFIG_SYNC) += sync.o sync_debug.o
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obj-$(CONFIG_SW_SYNC) += sw_sync.o
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@ -1,166 +0,0 @@
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/* drivers/misc/timed_gpio.c
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*
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* Copyright (C) 2008 Google, Inc.
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* Author: Mike Lockwood <lockwood@android.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/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/hrtimer.h>
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#include <linux/err.h>
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#include <linux/gpio.h>
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#include <linux/ktime.h>
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#include "timed_output.h"
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#include "timed_gpio.h"
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struct timed_gpio_data {
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struct timed_output_dev dev;
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struct hrtimer timer;
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spinlock_t lock;
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unsigned gpio;
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int max_timeout;
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u8 active_low;
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};
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static enum hrtimer_restart gpio_timer_func(struct hrtimer *timer)
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{
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struct timed_gpio_data *data =
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container_of(timer, struct timed_gpio_data, timer);
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gpio_direction_output(data->gpio, data->active_low ? 1 : 0);
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return HRTIMER_NORESTART;
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}
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static int gpio_get_time(struct timed_output_dev *dev)
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{
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struct timed_gpio_data *data;
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ktime_t t;
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data = container_of(dev, struct timed_gpio_data, dev);
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if (!hrtimer_active(&data->timer))
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return 0;
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t = hrtimer_get_remaining(&data->timer);
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return ktime_to_ms(t);
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}
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static void gpio_enable(struct timed_output_dev *dev, int value)
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{
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struct timed_gpio_data *data =
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container_of(dev, struct timed_gpio_data, dev);
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unsigned long flags;
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spin_lock_irqsave(&data->lock, flags);
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/* cancel previous timer and set GPIO according to value */
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hrtimer_cancel(&data->timer);
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gpio_direction_output(data->gpio, data->active_low ? !value : !!value);
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if (value > 0) {
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if (value > data->max_timeout)
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value = data->max_timeout;
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hrtimer_start(&data->timer,
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ktime_set(value / 1000, (value % 1000) * 1000000),
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HRTIMER_MODE_REL);
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}
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spin_unlock_irqrestore(&data->lock, flags);
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}
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static int timed_gpio_probe(struct platform_device *pdev)
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{
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struct timed_gpio_platform_data *pdata = pdev->dev.platform_data;
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struct timed_gpio *cur_gpio;
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struct timed_gpio_data *gpio_data, *gpio_dat;
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int i, ret;
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if (!pdata)
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return -EBUSY;
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gpio_data = devm_kcalloc(&pdev->dev, pdata->num_gpios,
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sizeof(*gpio_data), GFP_KERNEL);
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if (!gpio_data)
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return -ENOMEM;
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for (i = 0; i < pdata->num_gpios; i++) {
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cur_gpio = &pdata->gpios[i];
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gpio_dat = &gpio_data[i];
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hrtimer_init(&gpio_dat->timer, CLOCK_MONOTONIC,
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HRTIMER_MODE_REL);
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gpio_dat->timer.function = gpio_timer_func;
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spin_lock_init(&gpio_dat->lock);
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gpio_dat->dev.name = cur_gpio->name;
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gpio_dat->dev.get_time = gpio_get_time;
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gpio_dat->dev.enable = gpio_enable;
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ret = gpio_request(cur_gpio->gpio, cur_gpio->name);
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if (ret < 0)
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goto err_out;
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ret = timed_output_dev_register(&gpio_dat->dev);
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if (ret < 0) {
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gpio_free(cur_gpio->gpio);
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goto err_out;
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}
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gpio_dat->gpio = cur_gpio->gpio;
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gpio_dat->max_timeout = cur_gpio->max_timeout;
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gpio_dat->active_low = cur_gpio->active_low;
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gpio_direction_output(gpio_dat->gpio, gpio_dat->active_low);
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}
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platform_set_drvdata(pdev, gpio_data);
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return 0;
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err_out:
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while (--i >= 0) {
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timed_output_dev_unregister(&gpio_data[i].dev);
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gpio_free(gpio_data[i].gpio);
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}
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return ret;
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}
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static int timed_gpio_remove(struct platform_device *pdev)
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{
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struct timed_gpio_platform_data *pdata = pdev->dev.platform_data;
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struct timed_gpio_data *gpio_data = platform_get_drvdata(pdev);
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int i;
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for (i = 0; i < pdata->num_gpios; i++) {
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timed_output_dev_unregister(&gpio_data[i].dev);
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gpio_free(gpio_data[i].gpio);
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}
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return 0;
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}
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static struct platform_driver timed_gpio_driver = {
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.probe = timed_gpio_probe,
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.remove = timed_gpio_remove,
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.driver = {
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.name = TIMED_GPIO_NAME,
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},
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};
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module_platform_driver(timed_gpio_driver);
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MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>");
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MODULE_DESCRIPTION("timed gpio driver");
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MODULE_LICENSE("GPL");
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@ -1,33 +0,0 @@
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/* include/linux/timed_gpio.h
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*
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* Copyright (C) 2008 Google, Inc.
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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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#ifndef _LINUX_TIMED_GPIO_H
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#define _LINUX_TIMED_GPIO_H
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#define TIMED_GPIO_NAME "timed-gpio"
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struct timed_gpio {
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const char *name;
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unsigned gpio;
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int max_timeout;
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u8 active_low;
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};
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struct timed_gpio_platform_data {
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int num_gpios;
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struct timed_gpio *gpios;
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};
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#endif
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@ -1,110 +0,0 @@
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/* drivers/misc/timed_output.c
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*
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* Copyright (C) 2009 Google, Inc.
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* Author: Mike Lockwood <lockwood@android.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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#define pr_fmt(fmt) "timed_output: " fmt
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#include <linux/init.h>
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#include <linux/export.h>
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#include <linux/types.h>
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#include <linux/device.h>
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#include <linux/fs.h>
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#include <linux/err.h>
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#include "timed_output.h"
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static struct class *timed_output_class;
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static atomic_t device_count;
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static ssize_t enable_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct timed_output_dev *tdev = dev_get_drvdata(dev);
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int remaining = tdev->get_time(tdev);
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return sprintf(buf, "%d\n", remaining);
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}
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static ssize_t enable_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t size)
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{
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struct timed_output_dev *tdev = dev_get_drvdata(dev);
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int value;
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int rc;
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rc = kstrtoint(buf, 0, &value);
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if (rc != 0)
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return -EINVAL;
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tdev->enable(tdev, value);
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return size;
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}
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static DEVICE_ATTR_RW(enable);
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static struct attribute *timed_output_attrs[] = {
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&dev_attr_enable.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(timed_output);
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static int create_timed_output_class(void)
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{
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if (!timed_output_class) {
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timed_output_class = class_create(THIS_MODULE, "timed_output");
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if (IS_ERR(timed_output_class))
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return PTR_ERR(timed_output_class);
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atomic_set(&device_count, 0);
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timed_output_class->dev_groups = timed_output_groups;
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}
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return 0;
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}
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int timed_output_dev_register(struct timed_output_dev *tdev)
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{
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int ret;
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if (!tdev || !tdev->name || !tdev->enable || !tdev->get_time)
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return -EINVAL;
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ret = create_timed_output_class();
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if (ret < 0)
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return ret;
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tdev->index = atomic_inc_return(&device_count);
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tdev->dev = device_create(timed_output_class, NULL,
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MKDEV(0, tdev->index), NULL, "%s", tdev->name);
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if (IS_ERR(tdev->dev))
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return PTR_ERR(tdev->dev);
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dev_set_drvdata(tdev->dev, tdev);
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tdev->state = 0;
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return 0;
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}
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EXPORT_SYMBOL_GPL(timed_output_dev_register);
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void timed_output_dev_unregister(struct timed_output_dev *tdev)
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{
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tdev->enable(tdev, 0);
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device_destroy(timed_output_class, MKDEV(0, tdev->index));
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}
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EXPORT_SYMBOL_GPL(timed_output_dev_unregister);
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static int __init timed_output_init(void)
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{
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return create_timed_output_class();
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}
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device_initcall(timed_output_init);
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@ -1,37 +0,0 @@
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/* include/linux/timed_output.h
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*
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* Copyright (C) 2008 Google, Inc.
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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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#ifndef _LINUX_TIMED_OUTPUT_H
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#define _LINUX_TIMED_OUTPUT_H
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struct timed_output_dev {
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const char *name;
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/* enable the output and set the timer */
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void (*enable)(struct timed_output_dev *sdev, int timeout);
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/* returns the current number of milliseconds remaining on the timer */
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int (*get_time)(struct timed_output_dev *sdev);
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/* private data */
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struct device *dev;
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int index;
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int state;
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};
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int timed_output_dev_register(struct timed_output_dev *dev);
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void timed_output_dev_unregister(struct timed_output_dev *dev);
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#endif
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