diff options
Diffstat (limited to 'drivers/staging/iio/trigger/iio-trig-gpio.c')
| -rw-r--r-- | drivers/staging/iio/trigger/iio-trig-gpio.c | 167 |
1 files changed, 0 insertions, 167 deletions
diff --git a/drivers/staging/iio/trigger/iio-trig-gpio.c b/drivers/staging/iio/trigger/iio-trig-gpio.c deleted file mode 100644 index 7c593d18a910..000000000000 --- a/drivers/staging/iio/trigger/iio-trig-gpio.c +++ /dev/null @@ -1,167 +0,0 @@ -/* - * Industrial I/O - gpio based trigger support - * - * Copyright (c) 2008 Jonathan Cameron - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License version 2 as published by - * the Free Software Foundation. - * - * Currently this is more of a functioning proof of concept than a full - * fledged trigger driver. - * - * TODO: - * - * Add board config elements to allow specification of startup settings. - */ - -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/platform_device.h> -#include <linux/interrupt.h> -#include <linux/gpio.h> -#include <linux/slab.h> - -#include <linux/iio/iio.h> -#include <linux/iio/trigger.h> - -static LIST_HEAD(iio_gpio_trigger_list); -static DEFINE_MUTEX(iio_gpio_trigger_list_lock); - -struct iio_gpio_trigger_info { - struct mutex in_use; - unsigned int irq; -}; -/* - * Need to reference count these triggers and only enable gpio interrupts - * as appropriate. - */ - -/* So what functionality do we want in here?... */ -/* set high / low as interrupt type? */ - -static irqreturn_t iio_gpio_trigger_poll(int irq, void *private) -{ - /* Timestamp not currently provided */ - iio_trigger_poll(private, 0); - return IRQ_HANDLED; -} - -static const struct iio_trigger_ops iio_gpio_trigger_ops = { - .owner = THIS_MODULE, -}; - -static int iio_gpio_trigger_probe(struct platform_device *pdev) -{ - struct iio_gpio_trigger_info *trig_info; - struct iio_trigger *trig, *trig2; - unsigned long irqflags; - struct resource *irq_res; - int irq, ret = 0, irq_res_cnt = 0; - - do { - irq_res = platform_get_resource(pdev, - IORESOURCE_IRQ, irq_res_cnt); - - if (irq_res == NULL) { - if (irq_res_cnt == 0) - dev_err(&pdev->dev, "No GPIO IRQs specified"); - break; - } - irqflags = (irq_res->flags & IRQF_TRIGGER_MASK) | IRQF_SHARED; - - for (irq = irq_res->start; irq <= irq_res->end; irq++) { - - trig = iio_trigger_alloc("irqtrig%d", irq); - if (!trig) { - ret = -ENOMEM; - goto error_free_completed_registrations; - } - - trig_info = kzalloc(sizeof(*trig_info), GFP_KERNEL); - if (!trig_info) { - ret = -ENOMEM; - goto error_put_trigger; - } - iio_trigger_set_drvdata(trig, trig_info); - trig_info->irq = irq; - trig->ops = &iio_gpio_trigger_ops; - ret = request_irq(irq, iio_gpio_trigger_poll, - irqflags, trig->name, trig); - if (ret) { - dev_err(&pdev->dev, - "request IRQ-%d failed", irq); - goto error_free_trig_info; - } - - ret = iio_trigger_register(trig); - if (ret) - goto error_release_irq; - - list_add_tail(&trig->alloc_list, - &iio_gpio_trigger_list); - } - - irq_res_cnt++; - } while (irq_res != NULL); - - - return 0; - -/* First clean up the partly allocated trigger */ -error_release_irq: - free_irq(irq, trig); -error_free_trig_info: - kfree(trig_info); -error_put_trigger: - iio_trigger_put(trig); -error_free_completed_registrations: - /* The rest should have been added to the iio_gpio_trigger_list */ - list_for_each_entry_safe(trig, - trig2, - &iio_gpio_trigger_list, - alloc_list) { - trig_info = iio_trigger_get_drvdata(trig); - free_irq(gpio_to_irq(trig_info->irq), trig); - kfree(trig_info); - iio_trigger_unregister(trig); - } - - return ret; -} - -static int iio_gpio_trigger_remove(struct platform_device *pdev) -{ - struct iio_trigger *trig, *trig2; - struct iio_gpio_trigger_info *trig_info; - - mutex_lock(&iio_gpio_trigger_list_lock); - list_for_each_entry_safe(trig, - trig2, - &iio_gpio_trigger_list, - alloc_list) { - trig_info = iio_trigger_get_drvdata(trig); - iio_trigger_unregister(trig); - free_irq(trig_info->irq, trig); - kfree(trig_info); - iio_trigger_put(trig); - } - mutex_unlock(&iio_gpio_trigger_list_lock); - - return 0; -} - -static struct platform_driver iio_gpio_trigger_driver = { - .probe = iio_gpio_trigger_probe, - .remove = iio_gpio_trigger_remove, - .driver = { - .name = "iio_gpio_trigger", - .owner = THIS_MODULE, - }, -}; - -module_platform_driver(iio_gpio_trigger_driver); - -MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>"); -MODULE_DESCRIPTION("Example gpio trigger for the iio subsystem"); -MODULE_LICENSE("GPL v2"); |