[v2,4/5] media: atomisp: Drop v4l2_get_acpi_sensor_info() function

Message ID 20230525190100.130010-5-hdegoede@redhat.com (mailing list archive)
State Accepted
Headers
Series media: atomisp: Add support for v4l2-async sensor registration |

Commit Message

Hans de Goede May 25, 2023, 7 p.m. UTC
  Drop v4l2_get_acpi_sensor_info() the 2 sensor drivers which were
using this have both been converted to v4l2-async probing, relying
on the atomisp_csi2_bridge.c code to add the GPIO mappings instead.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 .../media/atomisp/pci/atomisp_gmin_platform.c | 240 ------------------
 1 file changed, 240 deletions(-)
  

Patch

diff --git a/drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c b/drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c
index 10b7871017d5..bc2dd96176d0 100644
--- a/drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c
+++ b/drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c
@@ -1460,243 +1460,3 @@  DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x0f38, isp_pm_cap_fixup);
 
 MODULE_DESCRIPTION("Ancillary routines for binding ACPI devices");
 MODULE_LICENSE("GPL");
-
-/*
- * The below helper functions don't really belong here and should eventually be
- * moved to some place under drivers/media/v4l2-core.
- */
-#include <linux/platform_data/x86/soc.h>
-
-/*
- * 79234640-9e10-4fea-a5c1-b5aa8b19756f
- * This _DSM GUID returns information about the GPIO lines mapped to a sensor.
- * Function number 1 returns a count of the GPIO lines that are mapped.
- * Subsequent functions return 32 bit ints encoding information about the GPIO.
- */
-static const guid_t intel_sensor_gpio_info_guid =
-	GUID_INIT(0x79234640, 0x9e10, 0x4fea,
-		  0xa5, 0xc1, 0xb5, 0xaa, 0x8b, 0x19, 0x75, 0x6f);
-
-/*
- * 822ace8f-2814-4174-a56b-5f029fe079ee
- * This _DSM GUID returns a string from the sensor device, which acts as a
- * module identifier.
- */
-static const guid_t intel_sensor_module_guid =
-	GUID_INIT(0x822ace8f, 0x2814, 0x4174,
-		  0xa5, 0x6b, 0x5f, 0x02, 0x9f, 0xe0, 0x79, 0xee);
-
-#define INTEL_DSM_TYPE_SHIFT				0
-#define INTEL_DSM_TYPE_MASK				GENMASK(7, 0)
-#define INTEL_DSM_PIN_SHIFT				8
-#define INTEL_DSM_PIN_MASK				GENMASK(15, 8)
-#define INTEL_DSM_SENSOR_ON_VAL_SHIFT			24
-#define INTEL_DSM_SENSOR_ON_VAL_MASK			GENMASK(31, 24)
-
-#define INTEL_DSM_TYPE(x) \
-	(((x) & INTEL_DSM_TYPE_MASK) >> INTEL_DSM_TYPE_SHIFT)
-#define INTEL_DSM_PIN(x) \
-	(((x) & INTEL_DSM_PIN_MASK) >> INTEL_DSM_PIN_SHIFT)
-#define INTEL_DSM_SENSOR_ON_VAL(x) \
-	(((x) & INTEL_DSM_SENSOR_ON_VAL_MASK) >> INTEL_DSM_SENSOR_ON_VAL_SHIFT)
-
-#define V4L2_SENSOR_MAX_ACPI_GPIOS			2u
-
-struct v4l2_acpi_gpio_map {
-	struct acpi_gpio_params params[V4L2_SENSOR_MAX_ACPI_GPIOS];
-	struct acpi_gpio_mapping mapping[V4L2_SENSOR_MAX_ACPI_GPIOS + 1];
-};
-
-struct v4l2_acpi_gpio_parsing_data {
-	struct device *dev;
-	u32 settings[V4L2_SENSOR_MAX_ACPI_GPIOS];
-	unsigned int settings_count;
-	unsigned int res_count;
-	unsigned int map_count;
-	struct v4l2_acpi_gpio_map *map;
-};
-
-/* Note this always returns 1 to continue looping so that res_count is accurate */
-static int v4l2_acpi_handle_gpio_res(struct acpi_resource *ares, void *_data)
-{
-	struct v4l2_acpi_gpio_parsing_data *data = _data;
-	struct acpi_resource_gpio *agpio;
-	const char *name;
-	bool active_low;
-	unsigned int i;
-	u32 settings = 0;
-	u8 pin;
-
-	if (!acpi_gpio_get_io_resource(ares, &agpio))
-		return 1; /* Not a GPIO, continue the loop */
-
-	data->res_count++;
-
-	pin = agpio->pin_table[0];
-	for (i = 0; i < data->settings_count; i++) {
-		if (INTEL_DSM_PIN(data->settings[i]) == pin) {
-			settings = data->settings[i];
-			break;
-		}
-	}
-
-	if (i == data->settings_count) {
-		dev_warn(data->dev, "Could not find DSM GPIO settings for pin %d\n", pin);
-		return 1;
-	}
-
-	switch (INTEL_DSM_TYPE(settings)) {
-	case 0:
-		name = "reset-gpios";
-		break;
-	case 1:
-		name = "powerdown-gpios";
-		break;
-	default:
-		dev_warn(data->dev, "Unknown GPIO type 0x%02lx for pin %d\n",
-			 INTEL_DSM_TYPE(settings), pin);
-		return 1;
-	}
-
-	/*
-	 * Both reset and power-down need to be logical false when the sensor
-	 * is on (sensor should not be in reset and not be powered-down). So
-	 * when the sensor-on-value (which is the physical pin value) is high,
-	 * then the signal is active-low.
-	 */
-	active_low = INTEL_DSM_SENSOR_ON_VAL(settings) ? true : false;
-
-	i = data->map_count;
-	if (i == V4L2_SENSOR_MAX_ACPI_GPIOS)
-		return 1;
-
-	/* res_count is already incremented */
-	data->map->params[i].crs_entry_index = data->res_count - 1;
-	data->map->params[i].active_low = active_low;
-	data->map->mapping[i].name = name;
-	data->map->mapping[i].data = &data->map->params[i];
-	data->map->mapping[i].size = 1;
-	data->map_count++;
-
-	dev_info(data->dev, "%s crs %d %s pin %d active-%s\n", name,
-		 data->res_count - 1, agpio->resource_source.string_ptr,
-		 pin, active_low ? "low" : "high");
-
-	return 1;
-}
-
-/*
- * Helper function to create an ACPI GPIO lookup table for sensor reset and
- * powerdown signals on Intel Bay Trail (BYT) and Cherry Trail (CHT) devices,
- * including setting the correct polarity for the GPIO.
- *
- * This uses the "79234640-9e10-4fea-a5c1-b5aa8b19756f" DSM method directly
- * on the sensor device's ACPI node. This is different from later Intel
- * hardware which has a separate INT3472 with this info. Since there is
- * no separate firmware-node to which we can bind to register the GPIO lookups
- * this unfortunately means that all sensor drivers which may be used on
- * BYT or CHT hw need to call this function. This also means that this function
- * may only fail when it is actually called on BYT/CHT hw. In all other cases
- * it must always succeed.
- *
- * Note this code uses the same DSM GUID as the INT3472 discrete.c code
- * and there is some overlap, but there are enough differences that it is
- * difficult to share the code.
- */
-int v4l2_get_acpi_sensor_info(struct device *dev, char **module_id_str)
-{
-	struct acpi_device *adev = ACPI_COMPANION(dev);
-	struct v4l2_acpi_gpio_parsing_data data = { };
-	LIST_HEAD(resource_list);
-	union acpi_object *obj;
-	unsigned int i, j;
-	int ret;
-
-	if (module_id_str)
-		*module_id_str = NULL;
-
-	if (!adev)
-		return 0;
-
-	obj = acpi_evaluate_dsm_typed(adev->handle, &intel_sensor_module_guid,
-				      0x00, 0x01, NULL, ACPI_TYPE_STRING);
-	if (obj) {
-		dev_info(dev, "Sensor module id: '%s'\n", obj->string.pointer);
-		if (module_id_str)
-			*module_id_str = kstrdup(obj->string.pointer, GFP_KERNEL);
-
-		ACPI_FREE(obj);
-	}
-
-	if (!soc_intel_is_byt() && !soc_intel_is_cht())
-		return 0;
-
-	/*
-	 * First get the GPIO-settings count and then get count GPIO-settings
-	 * values. Note the order of these may differ from the order in which
-	 * the GPIOs are listed on the ACPI resources! So we first store them all
-	 * and then enumerate the ACPI resources and match them up by pin number.
-	 */
-	obj = acpi_evaluate_dsm_typed(adev->handle,
-				      &intel_sensor_gpio_info_guid, 0x00, 1,
-				      NULL, ACPI_TYPE_INTEGER);
-	if (!obj)
-		return dev_err_probe(dev, -EIO, "No _DSM entry for GPIO pin count\n");
-
-	data.settings_count = obj->integer.value;
-	ACPI_FREE(obj);
-
-	if (data.settings_count > V4L2_SENSOR_MAX_ACPI_GPIOS)
-		return dev_err_probe(dev, -EIO, "Too many GPIOs %u > %u\n",
-				     data.settings_count, V4L2_SENSOR_MAX_ACPI_GPIOS);
-
-	for (i = 0; i < data.settings_count; i++) {
-		/*
-		 * i + 2 because the index of this _DSM function is 1-based
-		 * and the first function is just a count.
-		 */
-		obj = acpi_evaluate_dsm_typed(adev->handle,
-					      &intel_sensor_gpio_info_guid,
-					      0x00, i + 2,
-					      NULL, ACPI_TYPE_INTEGER);
-		if (!obj)
-			return dev_err_probe(dev, -EIO, "No _DSM entry for GPIO pin %u\n", i);
-
-		data.settings[i] = obj->integer.value;
-		ACPI_FREE(obj);
-	}
-
-	/* Since we match up by pin-number the pin-numbers must be unique */
-	for (i = 0; i < data.settings_count; i++) {
-		for (j = i + 1; j < data.settings_count; j++) {
-			if (INTEL_DSM_PIN(data.settings[i]) !=
-			    INTEL_DSM_PIN(data.settings[j]))
-				continue;
-
-			return dev_err_probe(dev, -EIO, "Duplicate pin number %lu\n",
-					     INTEL_DSM_PIN(data.settings[i]));
-		}
-	}
-
-	/* Use devm_kzalloc() for the mappings + params to auto-free them */
-	data.map = devm_kzalloc(dev, sizeof(*data.map), GFP_KERNEL);
-	if (!data.map)
-		return -ENOMEM;
-
-	/* Now parse the ACPI resources and build the lookup table */
-	data.dev = dev;
-	ret = acpi_dev_get_resources(adev, &resource_list,
-				     v4l2_acpi_handle_gpio_res, &data);
-	if (ret < 0)
-		return ret;
-
-	acpi_dev_free_resource_list(&resource_list);
-
-	if (data.map_count != data.settings_count ||
-	    data.res_count != data.settings_count)
-		dev_warn(dev, "ACPI GPIO resources vs DSM GPIO-info count mismatch (dsm: %d res: %d map %d\n",
-			 data.settings_count, data.res_count, data.map_count);
-
-	return devm_acpi_dev_add_driver_gpios(dev, data.map->mapping);
-}
-EXPORT_SYMBOL_GPL(v4l2_get_acpi_sensor_info);