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From fd4fb1f6633b21042ff084868323e15e708fe1cd Mon Sep 17 00:00:00 2001
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From: Hans de Goede <hdegoede@redhat.com>
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Date: Sun, 1 Jan 2017 22:11:20 +0100
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Subject: [PATCH 16/16] Input: silead: Do not try to directly access the GPIO
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when using ACPI pm
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On some x86 tablets we cannot directly access the GPIOs as they are
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claimed by the ACPI tables, so check it the i2c client is not being
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power-managed by ACPI before trying to get the power pin GPIO.
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Note this is a workaround patch to fix this until Andy' gpiolib-ACPI
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patches which make gpiolib more strict land, once those are landed this
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patch is no longer needed.
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Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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---
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drivers/input/touchscreen/silead.c | 22 ++++++++++++++++------
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1 file changed, 16 insertions(+), 6 deletions(-)
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diff --git a/drivers/input/touchscreen/silead.c b/drivers/input/touchscreen/silead.c
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index c0ba40c09699..30fba3cbe277 100644
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--- a/drivers/input/touchscreen/silead.c
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+++ b/drivers/input/touchscreen/silead.c
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@@ -517,12 +518,21 @@ static int silead_ts_probe(struct i2c_client *client,
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if (error)
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return error;
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- /* Power GPIO pin */
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- data->gpio_power = devm_gpiod_get_optional(dev, "power", GPIOD_OUT_LOW);
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- if (IS_ERR(data->gpio_power)) {
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- if (PTR_ERR(data->gpio_power) != -EPROBE_DEFER)
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- dev_err(dev, "Shutdown GPIO request failed\n");
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- return PTR_ERR(data->gpio_power);
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+ /*
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+ * If device power is not managed by ACPI, get the power_gpio
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+ * and manage it ourselves.
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+ */
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+#ifdef CONFIG_ACPI
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+ if (!acpi_bus_power_manageable(ACPI_HANDLE(dev)))
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+#endif
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+ {
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+ data->gpio_power = devm_gpiod_get_optional(dev, "power",
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+ GPIOD_OUT_LOW);
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+ if (IS_ERR(data->gpio_power)) {
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+ if (PTR_ERR(data->gpio_power) != -EPROBE_DEFER)
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+ dev_err(dev, "Power GPIO request failed\n");
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+ return PTR_ERR(data->gpio_power);
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+ }
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}
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error = silead_ts_setup(client);
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--
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2.13.0
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