[PATCH 2/3] platform/x86: int3472/discrete: Get the polarity from the _DSM entry

[Hans de Goede <hdegoede@redhat.com>]

The out of tree IPU6 driver has moved to also using the in kernel INT3472
code for doing power-ctrl rather then doing their own thing (good!).

On IPU6 the polarity is encoded in the _DSM entry rather then being
hardcoded to GPIO_ACTIVE_LOW.

Using the _DSM entry for this on IPU3 leads to regressions, so only
use the _DSM entry for this on non IPU3 devices.

Note there is a whole bunch of PCI-ids for the IPU6 which is why
the check is for the IPU3-CIO2, because the CIO2 there has a unique
PCI-id which can be used for this.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/platform/x86/intel/int3472/discrete.c | 28 +++++++++++++++++--
 1 file changed, 26 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/x86/intel/int3472/discrete.c b/drivers/platform/x86/intel/int3472/discrete.c
index bc6c62f3f3bf..9159291be28a 100644
--- a/drivers/platform/x86/intel/int3472/discrete.c
+++ b/drivers/platform/x86/intel/int3472/discrete.c
@@ -11,6 +11,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/overflow.h>
+#include <linux/pci.h>
 #include <linux/platform_device.h>
 #include <linux/uuid.h>
 
@@ -36,6 +37,19 @@ static const guid_t cio2_sensor_module_guid =
 	GUID_INIT(0x822ace8f, 0x2814, 0x4174,
 		  0xa5, 0x6b, 0x5f, 0x02, 0x9f, 0xe0, 0x79, 0xee);
 
+/* IPU3 vs IPU6 needs to be handled differently */
+#define IPU3_CIO2_PCI_ID				0x9d32
+
+static const struct pci_device_id ipu3_cio2_pci_id_table[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, IPU3_CIO2_PCI_ID) },
+	{ }
+};
+
+static int ipu3_present(void)
+{
+	return pci_dev_present(ipu3_cio2_pci_id_table);
+}
+
 /*
  * Here follows platform specific mapping information that we can pass to
  * the functions mapping resources to the sensors. Where the sensors have
@@ -242,6 +256,7 @@ static int skl_int3472_handle_gpio_resources(struct acpi_resource *ares,
 	union acpi_object *obj;
 	const char *err_msg;
 	const char *func;
+	u32 polarity;
 	int ret;
 	u8 type;
 
@@ -265,13 +280,22 @@ static int skl_int3472_handle_gpio_resources(struct acpi_resource *ares,
 
 	type = obj->integer.value & 0xff;
 
+	/* IPU3 always uses active-low, IPU6 polarity is encoded in the _DSM entry. */
+	if (ipu3_present())
+		polarity = GPIO_ACTIVE_LOW;
+	else
+		polarity = ((obj->integer.value >> 24) & 0xff) ? GPIO_ACTIVE_HIGH : GPIO_ACTIVE_LOW;
+
 	func = int3472_dsm_type_to_func(type);
 
+	dev_dbg(int3472->dev, "%s %s pin %d active-%s\n", func,
+		agpio->resource_source.string_ptr, agpio->pin_table[0],
+		(polarity == GPIO_ACTIVE_HIGH) ? "high" : "low");
+
 	switch (type) {
 	case INT3472_GPIO_TYPE_RESET:
 	case INT3472_GPIO_TYPE_POWERDOWN:
-		ret = skl_int3472_map_gpio_to_sensor(int3472, agpio, func,
-						     GPIO_ACTIVE_LOW);
+		ret = skl_int3472_map_gpio_to_sensor(int3472, agpio, func, polarity);
 		if (ret)
 			err_msg = "Failed to map GPIO pin to sensor\n";
 
-- 
2.38.1