示例#1
0
/**
 * mmc_gpiod_request_ro - request a gpio descriptor for write protection
 * @host: mmc host
 * @con_id: function within the GPIO consumer
 * @idx: index of the GPIO to obtain in the consumer
 * @debounce: debounce time in microseconds
 * @gpio_invert: will return whether the GPIO line is inverted or not,
 * set to NULL to ignore
 *
 * Returns zero on success, else an error.
 */
int mmc_gpiod_request_ro(struct mmc_host *host, const char *con_id,
			 unsigned int idx,
			 unsigned int debounce, bool *gpio_invert)
{
	struct mmc_gpio *ctx = host->slot.handler_priv;
	struct gpio_desc *desc;
	int ret;

	desc = devm_gpiod_get_index(host->parent, con_id, idx, GPIOD_IN);
	if (IS_ERR(desc))
		return PTR_ERR(desc);

	if (debounce) {
		ret = gpiod_set_debounce(desc, debounce);
		if (ret < 0)
			return ret;
	}

	if (gpio_invert)
		*gpio_invert = !gpiod_is_active_low(desc);

	ctx->ro_gpio = desc;

	return 0;
}
示例#2
0
/**
 * mmc_gpiod_request_cd - request a gpio descriptor for card-detection
 * @host: mmc host
 * @con_id: function within the GPIO consumer
 * @idx: index of the GPIO to obtain in the consumer
 * @override_active_level: ignore %GPIO_ACTIVE_LOW flag
 * @debounce: debounce time in microseconds
 * @gpio_invert: will return whether the GPIO line is inverted or not, set
 * to NULL to ignore
 *
 * Use this function in place of mmc_gpio_request_cd() to use the GPIO
 * descriptor API.  Note that it is paired with mmc_gpiod_free_cd() not
 * mmc_gpio_free_cd().  Note also that it must be called prior to mmc_add_host()
 * otherwise the caller must also call mmc_gpiod_request_cd_irq().
 *
 * Returns zero on success, else an error.
 */
int mmc_gpiod_request_cd(struct mmc_host *host, const char *con_id,
			 unsigned int idx, bool override_active_level,
			 unsigned int debounce, bool *gpio_invert)
{
	struct mmc_gpio *ctx;
	struct gpio_desc *desc;
	int ret;

	ret = mmc_gpio_alloc(host);
	if (ret < 0)
		return ret;

	ctx = host->slot.handler_priv;

	if (!con_id)
		con_id = ctx->cd_label;

	desc = devm_gpiod_get_index(host->parent, con_id, idx, GPIOD_IN);
	if (IS_ERR(desc))
		return PTR_ERR(desc);

	if (debounce) {
		ret = gpiod_set_debounce(desc, debounce);
		if (ret < 0)
			return ret;
	}

	if (gpio_invert)
		*gpio_invert = !gpiod_is_active_low(desc);

	ctx->override_cd_active_level = override_active_level;
	ctx->cd_gpio = desc;

	return 0;
}
示例#3
0
文件: gpio_keys.c 项目: mkrufky/linux
static int gpio_keys_setup_key(struct platform_device *pdev,
				struct input_dev *input,
				struct gpio_keys_drvdata *ddata,
				const struct gpio_keys_button *button,
				int idx,
				struct fwnode_handle *child)
{
	const char *desc = button->desc ? button->desc : "gpio_keys";
	struct device *dev = &pdev->dev;
	struct gpio_button_data *bdata = &ddata->data[idx];
	irq_handler_t isr;
	unsigned long irqflags;
	int irq;
	int error;

	bdata->input = input;
	bdata->button = button;
	spin_lock_init(&bdata->lock);

	if (child) {
		bdata->gpiod = devm_fwnode_get_gpiod_from_child(dev, NULL,
								child,
								GPIOD_IN,
								desc);
		if (IS_ERR(bdata->gpiod)) {
			error = PTR_ERR(bdata->gpiod);
			if (error == -ENOENT) {
				/*
				 * GPIO is optional, we may be dealing with
				 * purely interrupt-driven setup.
				 */
				bdata->gpiod = NULL;
			} else {
				if (error != -EPROBE_DEFER)
					dev_err(dev, "failed to get gpio: %d\n",
						error);
				return error;
			}
		}
	} else if (gpio_is_valid(button->gpio)) {
		/*
		 * Legacy GPIO number, so request the GPIO here and
		 * convert it to descriptor.
		 */
		unsigned flags = GPIOF_IN;

		if (button->active_low)
			flags |= GPIOF_ACTIVE_LOW;

		error = devm_gpio_request_one(dev, button->gpio, flags, desc);
		if (error < 0) {
			dev_err(dev, "Failed to request GPIO %d, error %d\n",
				button->gpio, error);
			return error;
		}

		bdata->gpiod = gpio_to_desc(button->gpio);
		if (!bdata->gpiod)
			return -EINVAL;
	}

	if (bdata->gpiod) {
		if (button->debounce_interval) {
			error = gpiod_set_debounce(bdata->gpiod,
					button->debounce_interval * 1000);
			/* use timer if gpiolib doesn't provide debounce */
			if (error < 0)
				bdata->software_debounce =
						button->debounce_interval;
		}

		if (button->irq) {
			bdata->irq = button->irq;
		} else {
			irq = gpiod_to_irq(bdata->gpiod);
			if (irq < 0) {
				error = irq;
				dev_err(dev,
					"Unable to get irq number for GPIO %d, error %d\n",
					button->gpio, error);
				return error;
			}
			bdata->irq = irq;
		}

		INIT_DELAYED_WORK(&bdata->work, gpio_keys_gpio_work_func);

		isr = gpio_keys_gpio_isr;
		irqflags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING;

	} else {
		if (!button->irq) {
			dev_err(dev, "Found button without gpio or irq\n");
			return -EINVAL;
		}

		bdata->irq = button->irq;

		if (button->type && button->type != EV_KEY) {
			dev_err(dev, "Only EV_KEY allowed for IRQ buttons.\n");
			return -EINVAL;
		}

		bdata->release_delay = button->debounce_interval;
		setup_timer(&bdata->release_timer,
			    gpio_keys_irq_timer, (unsigned long)bdata);

		isr = gpio_keys_irq_isr;
		irqflags = 0;
	}

	bdata->code = &ddata->keymap[idx];
	*bdata->code = button->code;
	input_set_capability(input, button->type ?: EV_KEY, *bdata->code);

	/*
	 * Install custom action to cancel release timer and
	 * workqueue item.
	 */
	error = devm_add_action(dev, gpio_keys_quiesce_key, bdata);
	if (error) {
		dev_err(dev, "failed to register quiesce action, error: %d\n",
			error);
		return error;
	}

	/*
	 * If platform has specified that the button can be disabled,
	 * we don't want it to share the interrupt line.
	 */
	if (!button->can_disable)
		irqflags |= IRQF_SHARED;

	error = devm_request_any_context_irq(dev, bdata->irq, isr, irqflags,
					     desc, bdata);
	if (error < 0) {
		dev_err(dev, "Unable to claim irq %d; error %d\n",
			bdata->irq, error);
		return error;
	}

	return 0;
}
示例#4
0
static int palmas_usb_probe(struct platform_device *pdev)
{
	struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
	struct palmas_usb_platform_data	*pdata = dev_get_platdata(&pdev->dev);
	struct device_node *node = pdev->dev.of_node;
	struct palmas_usb *palmas_usb;
	int status;

	palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL);
	if (!palmas_usb)
		return -ENOMEM;

	if (node && !pdata) {
		palmas_usb->wakeup = of_property_read_bool(node, "ti,wakeup");
		palmas_usb->enable_id_detection = of_property_read_bool(node,
						"ti,enable-id-detection");
		palmas_usb->enable_vbus_detection = of_property_read_bool(node,
						"ti,enable-vbus-detection");
	} else {
		palmas_usb->wakeup = true;
		palmas_usb->enable_id_detection = true;
		palmas_usb->enable_vbus_detection = true;

		if (pdata)
			palmas_usb->wakeup = pdata->wakeup;
	}

	palmas_usb->id_gpiod = devm_gpiod_get_optional(&pdev->dev, "id",
							GPIOD_IN);
	if (IS_ERR(palmas_usb->id_gpiod)) {
		dev_err(&pdev->dev, "failed to get id gpio\n");
		return PTR_ERR(palmas_usb->id_gpiod);
	}

	palmas_usb->vbus_gpiod = devm_gpiod_get_optional(&pdev->dev, "vbus",
							GPIOD_IN);
	if (IS_ERR(palmas_usb->vbus_gpiod)) {
		dev_err(&pdev->dev, "failed to get vbus gpio\n");
		return PTR_ERR(palmas_usb->vbus_gpiod);
	}

	if (palmas_usb->enable_id_detection && palmas_usb->id_gpiod) {
		palmas_usb->enable_id_detection = false;
		palmas_usb->enable_gpio_id_detection = true;
	}

	if (palmas_usb->enable_vbus_detection && palmas_usb->vbus_gpiod) {
		palmas_usb->enable_vbus_detection = false;
		palmas_usb->enable_gpio_vbus_detection = true;
	}

	if (palmas_usb->enable_gpio_id_detection) {
		u32 debounce;

		if (of_property_read_u32(node, "debounce-delay-ms", &debounce))
			debounce = USB_GPIO_DEBOUNCE_MS;

		status = gpiod_set_debounce(palmas_usb->id_gpiod,
					    debounce * 1000);
		if (status < 0)
			palmas_usb->sw_debounce_jiffies = msecs_to_jiffies(debounce);
	}

	INIT_DELAYED_WORK(&palmas_usb->wq_detectid, palmas_gpio_id_detect);

	palmas->usb = palmas_usb;
	palmas_usb->palmas = palmas;

	palmas_usb->dev	 = &pdev->dev;

	palmas_usb_wakeup(palmas, palmas_usb->wakeup);

	platform_set_drvdata(pdev, palmas_usb);

	palmas_usb->edev = devm_extcon_dev_allocate(&pdev->dev,
						    palmas_extcon_cable);
	if (IS_ERR(palmas_usb->edev)) {
		dev_err(&pdev->dev, "failed to allocate extcon device\n");
		return -ENOMEM;
	}

	status = devm_extcon_dev_register(&pdev->dev, palmas_usb->edev);
	if (status) {
		dev_err(&pdev->dev, "failed to register extcon device\n");
		return status;
	}

	if (palmas_usb->enable_id_detection) {
		palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data,
							     PALMAS_ID_OTG_IRQ);
		palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data,
							 PALMAS_ID_IRQ);
		status = devm_request_threaded_irq(palmas_usb->dev,
				palmas_usb->id_irq,
				NULL, palmas_id_irq_handler,
				IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
				IRQF_ONESHOT,
				"palmas_usb_id", palmas_usb);
		if (status < 0) {
			dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
					palmas_usb->id_irq, status);
			return status;
		}
	} else if (palmas_usb->enable_gpio_id_detection) {
		palmas_usb->gpio_id_irq = gpiod_to_irq(palmas_usb->id_gpiod);
		if (palmas_usb->gpio_id_irq < 0) {
			dev_err(&pdev->dev, "failed to get id irq\n");
			return palmas_usb->gpio_id_irq;
		}
		status = devm_request_threaded_irq(&pdev->dev,
						   palmas_usb->gpio_id_irq,
						   NULL,
						   palmas_gpio_id_irq_handler,
						   IRQF_TRIGGER_RISING |
						   IRQF_TRIGGER_FALLING |
						   IRQF_ONESHOT,
						   "palmas_usb_id",
						   palmas_usb);
		if (status < 0) {
			dev_err(&pdev->dev,
				"failed to request handler for id irq\n");
			return status;
		}
	}

	if (palmas_usb->enable_vbus_detection) {
		palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
						       PALMAS_VBUS_OTG_IRQ);
		palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data,
							   PALMAS_VBUS_IRQ);
		status = devm_request_threaded_irq(palmas_usb->dev,
				palmas_usb->vbus_irq, NULL,
				palmas_vbus_irq_handler,
				IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
				IRQF_ONESHOT,
				"palmas_usb_vbus", palmas_usb);
		if (status < 0) {
			dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
					palmas_usb->vbus_irq, status);
			return status;
		}
	} else if (palmas_usb->enable_gpio_vbus_detection) {
		/* remux GPIO_1 as VBUSDET */
		status = palmas_update_bits(palmas,
			PALMAS_PU_PD_OD_BASE,
			PALMAS_PRIMARY_SECONDARY_PAD1,
			PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_MASK,
			(1 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_SHIFT));
		if (status < 0) {
			dev_err(&pdev->dev, "can't remux GPIO1\n");
			return status;
		}

		palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
						       PALMAS_VBUS_OTG_IRQ);
		palmas_usb->gpio_vbus_irq = gpiod_to_irq(palmas_usb->vbus_gpiod);
		if (palmas_usb->gpio_vbus_irq < 0) {
			dev_err(&pdev->dev, "failed to get vbus irq\n");
			return palmas_usb->gpio_vbus_irq;
		}
		status = devm_request_threaded_irq(&pdev->dev,
						palmas_usb->gpio_vbus_irq,
						NULL,
						palmas_vbus_irq_handler,
						IRQF_TRIGGER_FALLING |
						IRQF_TRIGGER_RISING |
						IRQF_ONESHOT,
						"palmas_usb_vbus",
						palmas_usb);
		if (status < 0) {
			dev_err(&pdev->dev,
				"failed to request handler for vbus irq\n");
			return status;
		}
	}

	palmas_enable_irq(palmas_usb);
	/* perform initial detection */
	if (palmas_usb->enable_gpio_vbus_detection)
		palmas_vbus_irq_handler(palmas_usb->gpio_vbus_irq, palmas_usb);
	palmas_gpio_id_detect(&palmas_usb->wq_detectid.work);
	device_set_wakeup_capable(&pdev->dev, true);
	return 0;
}