linux-kernel - [PATCH v3] extcon: int3496: Set the id pin to direction-input if necessary

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Message-Id: <20170313112834.11006-1-hdegoede@redhat.com>
Date:   Mon, 13 Mar 2017 12:28:34 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Chen-Yu Tsai <wens@...e.org>
Cc:     Hans de Goede <hdegoede@...hat.com>, linux-kernel@...r.kernel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v3] extcon: int3496: Set the id pin to direction-input if necessary

With the new more strict ACPI gpio code the dsdt's IoRestriction
flags are honored on gpiod_get, but in some dsdt's it is wrong,
so explicitly call gpiod_direction_input on the id gpio if
necessary.

This fixes the following errors when the int3496 code is used
together with the new more strict ACPI gpio code:

[ 2382.484415] gpio gpiochip1: (INT33FF:01): gpiochip_lock_as_irq: tried to flag a GPIO set as output for IRQ
[ 2382.484425] gpio gpiochip1: (INT33FF:01): unable to lock HW IRQ 3 for IRQ
[ 2382.484429] genirq: Failed to request resources for INT3496:00 (irq 174) on irqchip chv-gpio
[ 2382.484518] intel-int3496 INT3496:00: can't request IRQ for USB ID GPIO: -22
[ 2382.500359] intel-int3496: probe of INT3496:00 failed with error -22

Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Signed-off-by: Hans de Goede <hdegoede@...hat.com>
---
Changes in v2:
-Warn about firmware bug when the dsdt's IoRestriction does not allow input
Changes in v3:
-Use FW_BUG macro
-Group check together with gpiodesc error check
-Keep lines within 80 chars limit
---
 drivers/extcon/extcon-intel-int3496.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/extcon/extcon-intel-int3496.c b/drivers/extcon/extcon-intel-int3496.c
index b8ac947..d9f9afe 100644
--- a/drivers/extcon/extcon-intel-int3496.c
+++ b/drivers/extcon/extcon-intel-int3496.c
@@ -112,6 +112,9 @@ static int int3496_probe(struct platform_device *pdev)
 		ret = PTR_ERR(data->gpio_usb_id);
 		dev_err(dev, "can't request USB ID GPIO: %d\n", ret);
 		return ret;
+	} else if (gpiod_get_direction(data->gpio_usb_id) != GPIOF_DIR_IN) {
+		dev_warn(dev, FW_BUG "USB ID GPIO not in input mode, fixing\n");
+		gpiod_direction_input(data->gpio_usb_id);
 	}
 
 	data->usb_id_irq = gpiod_to_irq(data->gpio_usb_id);
-- 
2.9.3