Re: [PATCH] extcon: palmas: add support for using VBUSDET output
From: Chanwoo Choi
Date: Fri Nov 20 2015 - 11:34:50 EST
Hi Felipe,
On 2015. 11. 20. ìí 11:37, Felipe Balbi wrote:
>
> Hi Chanwoo,
>
> Chanwoo Choi <cw00.choi@xxxxxxxxxxx> writes:
>> Hi Felipe,
>>
>> On 2015ë 11ì 20ì 14:33, Chanwoo Choi wrote:
>>> Hi Felipe,
>>>
>>> Looks good to me. But I have one comment.
>>>
>>> On 2015ë 11ì 13ì 02:57, Felipe Balbi wrote:
>>>> TPS659038 can remux its GPIO_1 as VBUSDET output,
>>>> which can be tied to a SoC GPIO and used as a VBUS
>>>> interrupt.
>>>>
>>>> Beagle X15 uses that, in fact, and without it, I
>>>> could not get USB peripheral working with that
>>>> board.
>>>>
>>>> Signed-off-by: Felipe Balbi <balbi@xxxxxx>
>>>> ---
>>>> drivers/extcon/extcon-palmas.c | 22 ++++++++++++++++++++--
>>>> 1 file changed, 20 insertions(+), 2 deletions(-)
>>>>
>>>> diff --git a/drivers/extcon/extcon-palmas.c b/drivers/extcon/extcon-palmas.c
>>>> index 93c30a885740..7985d092c069 100644
>>>> --- a/drivers/extcon/extcon-palmas.c
>>>> +++ b/drivers/extcon/extcon-palmas.c
>>>> @@ -296,10 +296,28 @@ static int palmas_usb_probe(struct platform_device *pdev)
>>>> }
>>>>
>>>> if (palmas_usb->enable_vbus_detection) {
>>>> + int irq = platform_get_irq(pdev, 0);
>>>> +
>>>> + if (irq > 0) {
>>>> + /* 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 << 3));
>>>
>>> PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_SHIFT is appropriate instead of
>>> using '3'.
>
> good point :-)
>
>>>> + if (status < 0) {
>>>> + dev_err(&pdev->dev, "can't remux GPIO1\n");
>>>> + return status;
>>>> + }
>>>> +
>>>> + palmas_usb->vbus_irq = irq;
>>>> + } else {
>>>> + irq = regmap_irq_get_virq(palmas->irq_data,
>>>> + PALMAS_VBUS_IRQ);
>>>> + palmas_usb->vbus_irq = 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);
>>>> status = devm_request_threaded_irq(palmas_usb->dev,
>>>> palmas_usb->vbus_irq, NULL,
>>>> palmas_vbus_irq_handler,
>>>>
>>>
>>> Thanks,
>>> Chanwoo Choi
>>> --
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>>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>>> Please read the FAQ at http://www.tux.org/lkml/
>>>
>>
>> If you are OK about following patch, I'll apply it on extcon branch.
>
> that's perfect, thanks for fixing it :-)
>
Before applying this patch, I think that there are more generic method?
So, I check the extcon-palmas.c driver again. There is similiar case for id detection.
In some case, id detection use whether 'enable_id_detection' with own interrupt
or 'enable_gpio_id_dectection' with specific h/w gpio like this case of vbus.
In result, I implement the following patch for vbus gpio detection.
But, I'm not sure because I have not any H/W board for test.
If you possible, could you test it with following patch?
Thanks,
Chanwoo Choi
diff --git a/drivers/extcon/extcon-palmas.c b/drivers/extcon/extcon-palmas.c
index 93c30a8..885ee95 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 13e1d96..7b2526f 100644
--- a/include/linux/mfd/palmas.h
+++ b/include/linux/mfd/palmas.h
@@ -553,7 +553,9 @@ 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;
@@ -562,6 +564,7 @@ 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)
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