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authorRoger Quadros <rogerq@ti.com>2015-08-03 17:40:51 +0300
committerChanwoo Choi <cw00.choi@samsung.com>2015-08-10 15:26:25 +0300
commit92b7cb5dc885b38b21093eefed8028b615952965 (patch)
treede56922baf3fee8dd9ec7c7f9a43599de61c07f0 /drivers/extcon/extcon-palmas.c
parenta598af7f0279195abffbfb9bf2070457e9c89ff3 (diff)
downloadlinux-92b7cb5dc885b38b21093eefed8028b615952965.tar.xz
extcon: palmas: Support GPIO based USB ID detection
Some palmas based chip variants do not have OTG based ID logic. For these variants we rely on GPIO based USB ID detection. These chips do have VBUS comparator for VBUS detection so we continue to use the old way of detecting VBUS. Signed-off-by: Roger Quadros <rogerq@ti.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Acked-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Diffstat (limited to 'drivers/extcon/extcon-palmas.c')
-rw-r--r--drivers/extcon/extcon-palmas.c129
1 files changed, 114 insertions, 15 deletions
diff --git a/drivers/extcon/extcon-palmas.c b/drivers/extcon/extcon-palmas.c
index 8933e7e0d9da..662e91778cb0 100644
--- a/drivers/extcon/extcon-palmas.c
+++ b/drivers/extcon/extcon-palmas.c
@@ -28,6 +28,10 @@
#include <linux/mfd/palmas.h>
#include <linux/of.h>
#include <linux/of_platform.h>
+#include <linux/of_gpio.h>
+#include <linux/workqueue.h>
+
+#define USB_GPIO_DEBOUNCE_MS 20 /* ms */
static const unsigned int palmas_extcon_cable[] = {
EXTCON_USB,
@@ -118,19 +122,54 @@ static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb)
return IRQ_HANDLED;
}
+static void palmas_gpio_id_detect(struct work_struct *work)
+{
+ int id;
+ struct palmas_usb *palmas_usb = container_of(to_delayed_work(work),
+ struct palmas_usb,
+ wq_detectid);
+ struct extcon_dev *edev = palmas_usb->edev;
+
+ if (!palmas_usb->id_gpiod)
+ return;
+
+ id = gpiod_get_value_cansleep(palmas_usb->id_gpiod);
+
+ if (id) {
+ extcon_set_cable_state_(edev, EXTCON_USB_HOST, false);
+ dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
+ } else {
+ extcon_set_cable_state_(edev, EXTCON_USB_HOST, true);
+ dev_info(palmas_usb->dev, "USB-HOST cable is attached\n");
+ }
+}
+
+static irqreturn_t palmas_gpio_id_irq_handler(int irq, void *_palmas_usb)
+{
+ struct palmas_usb *palmas_usb = _palmas_usb;
+
+ queue_delayed_work(system_power_efficient_wq, &palmas_usb->wq_detectid,
+ palmas_usb->sw_debounce_jiffies);
+
+ return IRQ_HANDLED;
+}
+
static void palmas_enable_irq(struct palmas_usb *palmas_usb)
{
palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
PALMAS_USB_VBUS_CTRL_SET,
PALMAS_USB_VBUS_CTRL_SET_VBUS_ACT_COMP);
- palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
- PALMAS_USB_ID_CTRL_SET, PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP);
+ if (palmas_usb->enable_id_detection) {
+ palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
+ PALMAS_USB_ID_CTRL_SET,
+ PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP);
- palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
- PALMAS_USB_ID_INT_EN_HI_SET,
- PALMAS_USB_ID_INT_EN_HI_SET_ID_GND |
- PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
+ palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
+ PALMAS_USB_ID_INT_EN_HI_SET,
+ PALMAS_USB_ID_INT_EN_HI_SET_ID_GND |
+ PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
+ }
if (palmas_usb->enable_vbus_detection)
palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb);
@@ -169,20 +208,36 @@ static int palmas_usb_probe(struct platform_device *pdev)
palmas_usb->wakeup = pdata->wakeup;
}
+ palmas_usb->id_gpiod = devm_gpiod_get_optional(&pdev->dev, "id");
+ if (IS_ERR(palmas_usb->id_gpiod)) {
+ dev_err(&pdev->dev, "failed to get id gpio\n");
+ return PTR_ERR(palmas_usb->id_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_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->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);
- 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);
-
palmas_usb_wakeup(palmas, palmas_usb->wakeup);
platform_set_drvdata(pdev, palmas_usb);
@@ -201,6 +256,10 @@ static int palmas_usb_probe(struct platform_device *pdev)
}
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,
@@ -212,9 +271,33 @@ static int palmas_usb_probe(struct platform_device *pdev)
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,
@@ -229,10 +312,21 @@ static int palmas_usb_probe(struct platform_device *pdev)
}
palmas_enable_irq(palmas_usb);
+ /* perform initial detection */
+ palmas_gpio_id_detect(&palmas_usb->wq_detectid.work);
device_set_wakeup_capable(&pdev->dev, true);
return 0;
}
+static int palmas_usb_remove(struct platform_device *pdev)
+{
+ struct palmas_usb *palmas_usb = platform_get_drvdata(pdev);
+
+ cancel_delayed_work_sync(&palmas_usb->wq_detectid);
+
+ return 0;
+}
+
#ifdef CONFIG_PM_SLEEP
static int palmas_usb_suspend(struct device *dev)
{
@@ -243,6 +337,8 @@ static int palmas_usb_suspend(struct device *dev)
enable_irq_wake(palmas_usb->vbus_irq);
if (palmas_usb->enable_id_detection)
enable_irq_wake(palmas_usb->id_irq);
+ if (palmas_usb->enable_gpio_id_detection)
+ enable_irq_wake(palmas_usb->gpio_id_irq);
}
return 0;
}
@@ -256,6 +352,8 @@ static int palmas_usb_resume(struct device *dev)
disable_irq_wake(palmas_usb->vbus_irq);
if (palmas_usb->enable_id_detection)
disable_irq_wake(palmas_usb->id_irq);
+ if (palmas_usb->enable_gpio_id_detection)
+ disable_irq_wake(palmas_usb->gpio_id_irq);
}
return 0;
};
@@ -273,6 +371,7 @@ static const struct of_device_id of_palmas_match_tbl[] = {
static struct platform_driver palmas_usb_driver = {
.probe = palmas_usb_probe,
+ .remove = palmas_usb_remove,
.driver = {
.name = "palmas-usb",
.of_match_table = of_palmas_match_tbl,