diff options
Diffstat (limited to 'drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c')
-rw-r--r-- | drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c | 240 |
1 files changed, 0 insertions, 240 deletions
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); |