extcon: palmas: Add the support for VBUS detection by using GPIO

This patch support for VBUS detection by using GPIO pin.

Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Acked-by: Lee Jones <lee.jones@linaro.org>

2 files changed, 53 insertions, 0 deletions

diff --git a/drivers/extcon/extcon-palmas.c b/drivers/extcon/extcon-palmas.c
index 93c30a885740..885ee95a6a7b 100644
--- a/drivers/extcon/extcon-palmas.c
+++ b/drivers/extcon/extcon-palmas.c
@@ -216,11 +216,23 @@ static int palmas_usb_probe(struct platform_device *pdev)
                 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;
 
@@ -311,6 +323,40 @@ static int palmas_usb_probe(struct platform_device *pdev)
                                         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 |
+                                                IRQF_EARLY_RESUME,
+                                                "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);
@@ -337,6 +383,8 @@ static int palmas_usb_suspend(struct device *dev)
         if (device_may_wakeup(dev)) {
                 if (palmas_usb->enable_vbus_detection)
                         enable_irq_wake(palmas_usb->vbus_irq);
+                if (palmas_usb->enable_gpio_vbus_detection)
+                        enable_irq_wake(palmas_usb->gpio_vbus_irq);
                 if (palmas_usb->enable_id_detection)
                         enable_irq_wake(palmas_usb->id_irq);
                 if (palmas_usb->enable_gpio_id_detection)
@@ -352,6 +400,8 @@ static int palmas_usb_resume(struct device *dev)
         if (device_may_wakeup(dev)) {
                 if (palmas_usb->enable_vbus_detection)
                         disable_irq_wake(palmas_usb->vbus_irq);
+                if (palmas_usb->enable_gpio_vbus_detection)
+                        disable_irq_wake(palmas_usb->gpio_vbus_irq);
                 if (palmas_usb->enable_id_detection)
                         disable_irq_wake(palmas_usb->id_irq);
                 if (palmas_usb->enable_gpio_id_detection)
diff --git a/include/linux/mfd/palmas.h b/include/linux/mfd/palmas.h
index c800dbc42079..5c9a1d44c125 100644
--- a/include/linux/mfd/palmas.h
+++ b/include/linux/mfd/palmas.h
@@ -580,7 +580,9 @@ struct palmas_usb {
         int vbus_irq;
 
         int gpio_id_irq;
+        int gpio_vbus_irq;
         struct gpio_desc *id_gpiod;
+        struct gpio_desc *vbus_gpiod;
         unsigned long sw_debounce_jiffies;
         struct delayed_work wq_detectid;
 
@@ -589,6 +591,7 @@ struct palmas_usb {
         bool enable_vbus_detection;
         bool enable_id_detection;
         bool enable_gpio_id_detection;
+        bool enable_gpio_vbus_detection;
 };
 
 #define comparator_to_palmas(x) container_of((x), struct palmas_usb, comparator)