#include <linux/err.h>
#include <linux/gpio.h>
+#include "timed_output.h"
#include "timed_gpio.h"
-static struct class *timed_gpio_class;
-
struct timed_gpio_data {
- struct device *dev;
+ struct timed_output_dev dev;
struct hrtimer timer;
spinlock_t lock;
unsigned gpio;
static enum hrtimer_restart gpio_timer_func(struct hrtimer *timer)
{
- struct timed_gpio_data *gpio_data = container_of(timer, struct timed_gpio_data, timer);
+ struct timed_gpio_data *data =
+ container_of(timer, struct timed_gpio_data, timer);
- gpio_direction_output(gpio_data->gpio, gpio_data->active_low ? 1 : 0);
+ gpio_direction_output(data->gpio, data->active_low ? 1 : 0);
return HRTIMER_NORESTART;
}
-static ssize_t gpio_enable_show(struct device *dev, struct device_attribute *attr, char *buf)
+static int gpio_get_time(struct timed_output_dev *dev)
{
- struct timed_gpio_data *gpio_data = dev_get_drvdata(dev);
- int remaining;
+ struct timed_gpio_data *data =
+ container_of(dev, struct timed_gpio_data, dev);
- if (hrtimer_active(&gpio_data->timer)) {
- ktime_t r = hrtimer_get_remaining(&gpio_data->timer);
+ if (hrtimer_active(&data->timer)) {
+ ktime_t r = hrtimer_get_remaining(&data->timer);
struct timeval t = ktime_to_timeval(r);
- remaining = t.tv_sec * 1000 + t.tv_usec / 1000;
+ return t.tv_sec * 1000 + t.tv_usec / 1000;
} else
- remaining = 0;
-
- return sprintf(buf, "%d\n", remaining);
+ return 0;
}
-static ssize_t gpio_enable_store(
- struct device *dev, struct device_attribute *attr,
- const char *buf, size_t size)
+static void gpio_enable(struct timed_output_dev *dev, int value)
{
- struct timed_gpio_data *gpio_data = dev_get_drvdata(dev);
- int value;
+ struct timed_gpio_data *data =
+ container_of(dev, struct timed_gpio_data, dev);
unsigned long flags;
- sscanf(buf, "%d", &value);
-
- spin_lock_irqsave(&gpio_data->lock, flags);
+ spin_lock_irqsave(&data->lock, flags);
/* cancel previous timer and set GPIO according to value */
- hrtimer_cancel(&gpio_data->timer);
- gpio_direction_output(gpio_data->gpio, gpio_data->active_low ? !value : !!value);
+ hrtimer_cancel(&data->timer);
+ gpio_direction_output(data->gpio, data->active_low ? !value : !!value);
if (value > 0) {
- if (value > gpio_data->max_timeout)
- value = gpio_data->max_timeout;
+ if (value > data->max_timeout)
+ value = data->max_timeout;
- hrtimer_start(&gpio_data->timer,
- ktime_set(value / 1000, (value % 1000) * 1000000),
- HRTIMER_MODE_REL);
+ hrtimer_start(&data->timer,
+ ktime_set(value / 1000, (value % 1000) * 1000000),
+ HRTIMER_MODE_REL);
}
- spin_unlock_irqrestore(&gpio_data->lock, flags);
-
- return size;
+ spin_unlock_irqrestore(&data->lock, flags);
}
-static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, gpio_enable_show, gpio_enable_store);
-
static int timed_gpio_probe(struct platform_device *pdev)
{
struct timed_gpio_platform_data *pdata = pdev->dev.platform_data;
struct timed_gpio *cur_gpio;
struct timed_gpio_data *gpio_data, *gpio_dat;
- int i, ret = 0;
+ int i, j, ret = 0;
if (!pdata)
return -EBUSY;
- gpio_data = kzalloc(sizeof(struct timed_gpio_data) * pdata->num_gpios, GFP_KERNEL);
+ gpio_data = kzalloc(sizeof(struct timed_gpio_data) * pdata->num_gpios,
+ GFP_KERNEL);
if (!gpio_data)
return -ENOMEM;
cur_gpio = &pdata->gpios[i];
gpio_dat = &gpio_data[i];
- hrtimer_init(&gpio_dat->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+ hrtimer_init(&gpio_dat->timer, CLOCK_MONOTONIC,
+ HRTIMER_MODE_REL);
gpio_dat->timer.function = gpio_timer_func;
spin_lock_init(&gpio_dat->lock);
+ gpio_dat->dev.name = cur_gpio->name;
+ gpio_dat->dev.get_time = gpio_get_time;
+ gpio_dat->dev.enable = gpio_enable;
+ ret = timed_output_dev_register(&gpio_dat->dev);
+ if (ret < 0) {
+ for (j = 0; j < i; j++)
+ timed_output_dev_unregister(&gpio_data[i].dev);
+ kfree(gpio_data);
+ return ret;
+ }
+
gpio_dat->gpio = cur_gpio->gpio;
gpio_dat->max_timeout = cur_gpio->max_timeout;
gpio_dat->active_low = cur_gpio->active_low;
gpio_direction_output(gpio_dat->gpio, gpio_dat->active_low);
-
- gpio_dat->dev = device_create(timed_gpio_class, &pdev->dev, 0, "%s", cur_gpio->name);
- if (unlikely(IS_ERR(gpio_dat->dev)))
- return PTR_ERR(gpio_dat->dev);
-
- dev_set_drvdata(gpio_dat->dev, gpio_dat);
- ret = device_create_file(gpio_dat->dev, &dev_attr_enable);
- if (ret)
- return ret;
}
platform_set_drvdata(pdev, gpio_data);
struct timed_gpio_data *gpio_data = platform_get_drvdata(pdev);
int i;
- for (i = 0; i < pdata->num_gpios; i++) {
- device_remove_file(gpio_data[i].dev, &dev_attr_enable);
- device_unregister(gpio_data[i].dev);
- }
+ for (i = 0; i < pdata->num_gpios; i++)
+ timed_output_dev_unregister(&gpio_data[i].dev);
kfree(gpio_data);
.probe = timed_gpio_probe,
.remove = timed_gpio_remove,
.driver = {
- .name = "timed-gpio",
+ .name = TIMED_GPIO_NAME,
.owner = THIS_MODULE,
},
};
static int __init timed_gpio_init(void)
{
- timed_gpio_class = class_create(THIS_MODULE, "timed_output");
- if (IS_ERR(timed_gpio_class))
- return PTR_ERR(timed_gpio_class);
return platform_driver_register(&timed_gpio_driver);
}
static void __exit timed_gpio_exit(void)
{
- class_destroy(timed_gpio_class);
platform_driver_unregister(&timed_gpio_driver);
}
--- /dev/null
+/* drivers/misc/timed_output.c
+ *
+ * Copyright (C) 2009 Google, Inc.
+ * Author: Mike Lockwood <lockwood@android.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/err.h>
+
+#include "timed_output.h"
+
+static struct class *timed_output_class;
+static atomic_t device_count;
+
+static ssize_t enable_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct timed_output_dev *tdev = dev_get_drvdata(dev);
+ int remaining = tdev->get_time(tdev);
+
+ return sprintf(buf, "%d\n", remaining);
+}
+
+static ssize_t enable_store(
+ struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t size)
+{
+ struct timed_output_dev *tdev = dev_get_drvdata(dev);
+ int value;
+
+ sscanf(buf, "%d", &value);
+ tdev->enable(tdev, value);
+
+ return size;
+}
+
+static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, enable_show, enable_store);
+
+static int create_timed_output_class(void)
+{
+ if (!timed_output_class) {
+ timed_output_class = class_create(THIS_MODULE, "timed_output");
+ if (IS_ERR(timed_output_class))
+ return PTR_ERR(timed_output_class);
+ atomic_set(&device_count, 0);
+ }
+
+ return 0;
+}
+
+int timed_output_dev_register(struct timed_output_dev *tdev)
+{
+ int ret;
+
+ if (!tdev || !tdev->name || !tdev->enable || !tdev->get_time)
+ return -EINVAL;
+
+ ret = create_timed_output_class();
+ if (ret < 0)
+ return ret;
+
+ tdev->index = atomic_inc_return(&device_count);
+ tdev->dev = device_create(timed_output_class, NULL,
+ MKDEV(0, tdev->index), NULL, tdev->name);
+ if (IS_ERR(tdev->dev))
+ return PTR_ERR(tdev->dev);
+
+ ret = device_create_file(tdev->dev, &dev_attr_enable);
+ if (ret < 0)
+ goto err_create_file;
+
+ dev_set_drvdata(tdev->dev, tdev);
+ tdev->state = 0;
+ return 0;
+
+err_create_file:
+ device_destroy(timed_output_class, MKDEV(0, tdev->index));
+ printk(KERN_ERR "timed_output: Failed to register driver %s\n",
+ tdev->name);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(timed_output_dev_register);
+
+void timed_output_dev_unregister(struct timed_output_dev *tdev)
+{
+ device_remove_file(tdev->dev, &dev_attr_enable);
+ device_destroy(timed_output_class, MKDEV(0, tdev->index));
+ dev_set_drvdata(tdev->dev, NULL);
+}
+EXPORT_SYMBOL_GPL(timed_output_dev_unregister);
+
+static int __init timed_output_init(void)
+{
+ return create_timed_output_class();
+}
+
+static void __exit timed_output_exit(void)
+{
+ class_destroy(timed_output_class);
+}
+
+module_init(timed_output_init);
+module_exit(timed_output_exit);
+
+MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>");
+MODULE_DESCRIPTION("timed output class driver");
+MODULE_LICENSE("GPL");
git://ftp.safe.ca / safe / jmp / linux-2.6 / commitdiff