[PATCH v3 1/1] platform/x86: int3472: Call "reset" GPIO "enable" for INT347E

[Sakari Ailus <sakari.ailus@linux.intel.com>]

The DT bindings for ov7251 specify "enable" GPIO (xshutdown in
documentation) but the int3472 indiscriminately provides this as a "reset"
GPIO to sensor drivers. Take this into account by assigning it as "enable"
with active high polarity for INT347E devices, i.e. ov7251. "reset" with
active low polarity remains the default GPIO name for other devices.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
---
since v2:

- Implement a more generic GPIO mangling capability, as suggested by Hans
  de Goede.

- Include linux/array_size.h for ARRAY_SIZE().

 drivers/platform/x86/intel/int3472/discrete.c | 43 +++++++++++++++++--
 1 file changed, 40 insertions(+), 3 deletions(-)

diff --git a/drivers/platform/x86/intel/int3472/discrete.c b/drivers/platform/x86/intel/int3472/discrete.c
index d881b2cfcdfc..181675e57c39 100644
--- a/drivers/platform/x86/intel/int3472/discrete.c
+++ b/drivers/platform/x86/intel/int3472/discrete.c
@@ -2,6 +2,7 @@
 /* Author: Dan Scally <djrscally@gmail.com> */
 
 #include <linux/acpi.h>
+#include <linux/array_size.h>
 #include <linux/bitfield.h>
 #include <linux/device.h>
 #include <linux/gpio/consumer.h>
@@ -122,9 +123,44 @@ skl_int3472_gpiod_get_from_temp_lookup(struct int3472_discrete_device *int3472,
 	return desc;
 }
 
-static void int3472_get_func_and_polarity(u8 type, const char **func, u32 *polarity)
+/**
+ * struct int3472_gpio_map - Map GPIOs to whatever is expected by the
+ * sensor driver (as in DT bindings)
+ * @hid: The ACPI HID of the device without the instance number e.g. i2c-INT347E
+ * @type_from: The GPIO type from ACPI ?SDT
+ * @type_to: The assigned GPIO type, typically same as type_from
+ * @func: The function, e.g. "enable"
+ * @polarity: GPIO_ACTIVE_{HIGH,LOW}
+ */
+struct int3472_gpio_map {
+	const char *hid;
+	u8 type_from;
+	u8 type_to;
+	const char *func;
+	unsigned int polarity;
+};
+
+static const struct int3472_gpio_map int3472_gpio_map[] = {
+	{ "INT347E", INT3472_GPIO_TYPE_RESET, INT3472_GPIO_TYPE_RESET, "enable", GPIO_ACTIVE_HIGH },
+};
+
+static void int3472_get_func_and_polarity(struct acpi_device *adev, u8 *type,
+					  const char **func, u32 *polarity)
 {
-	switch (type) {
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(int3472_gpio_map); i++) {
+		if (*type != int3472_gpio_map[i].type_from ||
+		    !acpi_dev_hid_uid_match(adev, int3472_gpio_map[i].hid, NULL))
+			continue;
+
+		*type = int3472_gpio_map[i].type_to;
+		*func = int3472_gpio_map[i].func;
+		*polarity = int3472_gpio_map[i].polarity;
+		return;
+	}
+
+	switch (*type) {
 	case INT3472_GPIO_TYPE_RESET:
 		*func = "reset";
 		*polarity = GPIO_ACTIVE_LOW;
@@ -217,7 +253,8 @@ static int skl_int3472_handle_gpio_resources(struct acpi_resource *ares,
 
 	type = FIELD_GET(INT3472_GPIO_DSM_TYPE, obj->integer.value);
 
-	int3472_get_func_and_polarity(type, &func, &polarity);
+	int3472_get_func_and_polarity(int3472->sensor, &type, &func,
+				      &polarity);
 
 	pin = FIELD_GET(INT3472_GPIO_DSM_PIN, obj->integer.value);
 	if (pin != agpio->pin_table[0])
-- 
2.39.5